JP7777410B2 - Cement clinker manufacturing system, cement clinker manufacturing method, control device, and program - Google Patents

Description

The present disclosure relates to a cement clinker manufacturing system, a cement clinker manufacturing method, a control device, and a control method.

Patent Document 1 discloses a control device for a clinker cooler in a cement manufacturing plant. This control device controls the operating speed of the grate so that the pressure in an air chamber for cooling air, located in a section below the grate of the clinker cooler, reaches a predetermined target value.

Japanese Patent Application Publication No. 5-319877

The present disclosure provides a manufacturing system, manufacturing method, control device, and control method that are useful for stabilizing the quality of cement clinker.

A cement clinker manufacturing system according to one aspect of the present disclosure includes a cement clinker manufacturing apparatus having a heating unit that heats cement raw materials and a waste supply unit that supplies waste, including waste plastics, to the heating unit, and a control device that controls the manufacturing apparatus. The control device executes first supply control, which includes setting a first target supply amount of waste to the heating unit so that the temperature indicating the heating status of the cement raw materials in the heating unit approaches the target temperature, and controlling the waste supply unit so that the supply amount of waste to the heating unit approaches the first target supply amount.

Feedback control can be used to bring the temperature, which indicates the heating status of the cement raw materials in the heating section, closer to a target value. In this feedback control, for example, the deviation between the measured temperature and the target temperature is directly calculated for the operation amount of the waste transport device included in the waste supply section, and the control device outputs this operation amount to control the amount of waste supplied to the heating section. However, with this control, if a disturbance occurs, such as a blockage of waste in the waste supply section for some reason, a discrepancy occurs between the actual supply amount and the target supply amount. In this case, control is performed to correct the discrepancy in the supply amount after a change occurs in the temperature, which indicates the heating status of the cement raw materials in the heating section (hereinafter sometimes referred to as the "heating temperature"). This significantly affects the heating temperature. In contrast, in the above-mentioned manufacturing system, a target supply amount is set, and the waste supply section is controlled so that the actual supply amount approaches the target supply amount. Therefore, even if such a disturbance occurs, the discrepancy between the actual supply amount and the target supply amount is resolved relatively quickly without the need to monitor temperature changes, resulting in minimal impact on the heating temperature. As a result, the heating temperature can be stabilized even when waste material is fed, which is useful for stabilizing the quality of cement clinker.

The manufacturing apparatus may further include an energy source supply unit that supplies the heating unit with an energy source containing at least one selected from the group consisting of coal, waste oil, C heavy oil, ammonia, and hydrogen. By its very nature, waste material contains a variety of components, and its calorific value tends to be unstable. By supplying the above energy source along with the waste material, the heating temperature can be made more stable. This is therefore even more useful for stabilizing the quality of cement clinker.

The control device may execute second supply control, which includes setting a second target supply amount of the energy source to the heating unit so that the temperature indicating the heating status of the cement raw materials in the heating unit approaches the target temperature, and controlling the energy source supply unit so that the supply amount of the energy source to the heating unit approaches the second target supply amount. The control device may start the second supply control when the deviation between the temperature indicating the heating status of the cement raw materials in the heating unit and the target temperature satisfies a predetermined condition while the first supply control is being executed. From the perspective of waste recycling, it is desirable to use as much waste as possible for heating in the heating unit, but the calories of the waste tend to be unstable. In the above configuration, the second supply control is executed when the deviation between the heating temperature and the target temperature satisfies a predetermined condition, thereby stabilizing the heating temperature compared to before the execution of the second supply control. This is therefore useful for achieving both an increase in the amount of waste used and a stable heating temperature.

Before starting the second supply control, the control device may execute fixed-quantity supply control, which controls the energy source supply unit so that the amount of energy source supply to the heating unit falls within a predetermined range. Changing the energy source supply from a non-zero supply to a certain supply amount is easier to achieve in a short amount of time than changing the energy source supply from a zero supply to a certain supply amount. In the above configuration, the transition from fixed-quantity supply control occurs when the second supply control is started, so the effect of the second supply control on the supply of the energy source is quickly reflected in the heating temperature. This is therefore even more useful for stabilizing the heating temperature.

The control device may execute second supply control, which includes setting a second target supply amount of the energy source to the heating unit so that the temperature indicating the heating status of the cement raw materials in the heating unit approaches the target temperature, and controlling the energy source supply unit so that the supply amount of the energy source to the heating unit approaches the second target supply amount. The control device may execute the second supply control during a period that overlaps with at least a portion of the execution period of the first supply control. In this case, the heating temperature is adjusted by both adjusting the supply amount of the waste material and adjusting the supply amount of the energy source, making it easier to stabilize the heating temperature than when only the supply amount of waste material is adjusted. This is therefore even more useful for stabilizing the heating temperature.

The energy source supply unit may supply coal as an energy source. The amount of waste supplied from the waste supply unit may be greater than the amount of coal supplied from the energy source supply unit. In this manufacturing system, waste is supplied while suppressing fluctuations in heating temperature. Therefore, this is useful for reducing the amount of coal used while suppressing the impact of waste supply.

A method for producing cement clinker according to one aspect of the present disclosure includes the steps of heating cement raw materials in a heating section, supplying waste materials including waste plastics to the heating section, setting a target supply amount of waste materials to the heating section so that the temperature indicating the heating status of the cement raw materials in the heating section approaches the target temperature, and adjusting the supply amount of waste materials to the heating section so that the supply amount of waste materials to the heating section approaches the target supply amount. In this cement clinker production method, similar to the production system described above, the heating temperature can be stabilized even when waste materials are supplied. Therefore, it is useful for stabilizing the quality of cement clinker.

A control device according to one aspect of the present disclosure is a device for controlling a cement clinker manufacturing device that heats cement raw materials using a heating unit to which waste materials including waste plastics are supplied. This control device performs supply control, including setting a target amount of waste material to be supplied to the heating unit so that the temperature indicating the heating status of the cement raw materials in the heating unit approaches the target temperature, and adjusting the amount of waste material to be supplied to the heating unit so that the amount of waste material to be supplied approaches the target amount. Similar to the manufacturing system described above, this control device can stabilize the heating temperature even when waste materials are supplied. Therefore, it is useful for stabilizing the quality of cement clinker.

A control method according to one aspect of the present disclosure is a method for controlling a cement clinker manufacturing apparatus that heats cement raw materials using a heating unit to which waste materials including waste plastics are supplied. This control method includes the steps of setting a target amount of waste material to be supplied to the heating unit so that the temperature indicating the heating status of the cement raw materials in the heating unit approaches the target temperature, and adjusting the amount of waste material to be supplied to the heating unit so that the amount of waste material to be supplied approaches the target amount. Similar to the manufacturing system described above, this control method can stabilize the heating temperature even when waste materials are supplied. Therefore, it is useful for stabilizing the quality of cement clinker.

The present disclosure provides a manufacturing system, manufacturing method, control device, and control method that are useful for stabilizing the quality of cement clinker.

FIG. 1 is a schematic diagram showing an example of a cement clinker production system. FIG. 2 is a schematic diagram showing an example of a waste material supply unit. FIG. 3 is a block diagram illustrating an example of the functional configuration of the control device. FIG. 4 is a block diagram illustrating an example of a hardware configuration of the control device. FIG. 5 is a flowchart showing an example of a series of processes executed by the control device. FIG. 6 is a flowchart showing an example of a control mode selection process. FIG. 7 is a flowchart showing an example of the control for following up to the target temperature. FIG. 8 is a flowchart showing an example of a series of processes executed by the control device.

One embodiment will now be described with reference to the drawings. In the description, identical elements or elements with identical functions will be given the same reference numerals, and duplicate explanations will be omitted. Furthermore, unless otherwise specified, positional relationships such as up, down, left, and right will be based on the positional relationships shown in the drawings. Furthermore, the dimensional ratios of each element are not limited to those shown in the drawings.

[Cement clinker manufacturing system]
Fig. 1 schematically shows a cement clinker production system according to one embodiment. The production system 1 shown in Fig. 1 is a system for producing cement clinker from cement raw materials. The production system 1 includes a production device 2 and a control device 100.

(Cement clinker manufacturing equipment)
The manufacturing apparatus 2 is an apparatus for manufacturing cement clinker by burning cement raw materials (cement clinker manufacturing apparatus), and includes, for example, a preheater 10, a rotary kiln 30, a clinker cooler 40, a first supply device 50, a second supply device 60, and temperature measurement devices 72 and 74.

The preheater 10 is a new suspension preheater (NSP). The preheater 10 preheats and calcines the cement raw materials using high-temperature gas (hereinafter simply referred to as "high-temperature gas"), including exhaust gas from the rotary kiln 30, before the cement raw materials are fired in the rotary kiln 30. The high-temperature gas has a temperature sufficient to preheat and calcinate the cement raw materials. The preheater 10 has cyclones C1, C2, C3, and C4 (four cyclones), a calciner 14, a rising duct 16, and a raw material supply section 18. Unlike the example shown in FIG. 1, the number of cyclones provided by the preheater 10 may be five or more or three or less.

Cyclones C1, C2, C3, and C4 are arranged in this order from top to bottom, and each cyclone separates the cement raw materials (preheated raw materials) from the high-temperature gas. The calciner 14 is a furnace body that calcines the cement raw materials using high-temperature gas, including exhaust gas from the rotary kiln 30. The calciner 14 functions as a heating section that heats the cement raw materials. The heating temperature in the calciner 14 is, for example, approximately 700°C to 900°C. The calciner 14 is connected to the end 32 of the rotary kiln 30 via a rising duct 16. The rising duct 16 guides the exhaust gas from the rotary kiln 30 to the calciner 14. The exhaust gas from the end 32 of the rotary kiln 30 flows upward through the rising duct 16 and the calciner 14.

The calciner 14 has a burner (not shown) that mixes an energy source (fuel) such as coal with air and supplies combustion gas to the interior of the calciner 14. The high-temperature gas includes exhaust gas from the rotary kiln 30 and combustion gas from the burner of the calciner 14. Inside the calciner 14, the combustion gas from the burner may form a swirling flow that rises while swirling. The high-temperature gas generated in the calciner 14 flows into cyclone C4 and then flows upward, passing through cyclones C3, C2, and C1 in that order.

The raw material supply unit 18 supplies the cement raw material produced in the previous process (raw material process) to the gas duct between cyclones C1 and C2. The supplied cement raw material descends through cyclones C1, C2, and C3 in this order, repeatedly exchanging heat with high-temperature gas in the gas duct between the cyclones and separating it from the high-temperature gas in the cyclones. The cement raw material separated from the high-temperature gas in cyclone C3 is introduced into the calciner 14. The heat exchange with the high-temperature gas in the calciner 14 decarbonates limestone (calcium carbonate: CaCO ₃ ) contained in the cement raw material. The calcined (decarbonated) cement raw material is introduced into cyclone C4 together with the high-temperature gas, separated from the high-temperature gas in cyclone C4, and then supplied to the kiln end 32 of the rotary kiln 30.

The rotary kiln 30 is a device that burns cement raw materials after they have been preheated and calcined in the preheater 10. The rotary kiln 30 functions as a heating unit that heats the cement raw materials. The heating temperature in the rotary kiln 30 is, for example, approximately 1000°C to 1500°C. The rotary kiln 30 has a main body 34 and a burner 36 provided at the rear end of the main body 34. The rotary kiln 30 produces cement clinker by heating the cement raw materials with combustion gas from the burner 36. The rotary kiln 30 discharges the produced cement clinker to the clinker cooler 40. The clinker cooler 40 cools the cement clinker using cooling air or the like.

The first supply device 50 (waste supply unit) supplies waste, including waste plastic, to the calciner 14 and the rotary kiln 30, respectively. The waste plastic includes, for example, plastic fragments (scrap) generated in the process of manufacturing plastic products, and plastic products (parts thereof) that are no longer needed and discarded. The waste plastic may also include shredder dust from home appliances or automobiles. The waste supplied from the first supply device 50 may also include waste other than waste plastic, such as wood chips. In the following description, "waste" refers to waste including waste plastic, unless otherwise specified.

The first supply device 50 is configured to be able to adjust the amount of waste material supplied per unit time to the calciner 14 and the amount of waste material supplied per unit time to the rotary kiln 30 based on operational instructions from the control device 100. The first supply device 50 includes a waste material supply unit 50A that supplies waste material to the calciner 14 and a waste material supply unit 50B that supplies waste material to the rotary kiln 30. Figure 2 shows a schematic diagram of an example of the waste material supply unit 50A of the first supply device 50. The waste material supply unit 50A includes a hopper 51, a feeder 52, a conveyor 54, an air discharge unit 56, and a transport amount measurement unit 58. In the following description, "supply amount" refers to the amount supplied per unit time, and "transport amount" refers to the amount transported per unit time.

The hopper 51 is a tank (container) that stores waste. The feeder 52 extracts the waste stored in the hopper 51 and supplies it to the conveyor 54. The feeder 52 may include an adjustment valve for adjusting the amount of waste supplied to the conveyor 54 based on operational instructions from the control device 100. The conveyor 54 transports (supplies) the waste supplied from the feeder 52 to the air delivery unit 56. The conveyor 54 may include a motor that changes its movement speed to adjust the amount of waste transported (supplied) to the air delivery unit 56 based on operational instructions from the control device 100.

The air delivery unit 56 uses air to deliver the waste transported by the conveyor 54 to the calciner 14. The waste delivered from the air delivery unit 56 is introduced into the calciner 14, for example, from the top of the calciner 14. The amount of waste supplied to the calciner 14 is determined by the amount of waste transported from the conveyor 54 to the air delivery unit 56. In other words, the amount of waste supplied to the calciner 14 can be adjusted by adjusting the amount of waste transported by the conveyor 54.

The transport amount measurement unit 58 measures the amount of waste being transported on the conveyor 54. The transport amount measurement unit 58 may measure the amount of waste being transported using any method. The transport amount measurement unit 58 may be, for example, a load cell-type conveyor scale. The transport amount measurement unit 58 may include a sensor that measures the load (weight) applied to the conveyor 54 and a sensor that measures the movement speed of the conveyor 54. By obtaining the integrated value of these loads and movement speeds, the transport amount (supply amount) of waste is obtained at each specified measurement cycle.

The waste supply unit 50A shown in FIG. 2 is an example and may be configured in any manner as long as it is capable of supplying waste to the calciner 14 and the supply rate is adjustable. The waste supply unit 50B is configured to be capable of supplying waste to the rotary kiln 30 and the supply rate is adjustable. The waste supply unit 50B is configured, for example, in the same manner as the waste supply unit 50A shown in FIG. 2.

The second supply device 60 supplies pulverized coal to the calciner 14 and the rotary kiln 30, respectively. The pulverized coal is powdered or finely granulated coal and is used as an energy source in the calciner 14 and the rotary kiln 30. In other words, the second supply device 60 functions as an energy source supply unit. The second supply device 60 is configured to be able to adjust the amount of pulverized coal supplied to the calciner 14 and the rotary kiln 30 based on operational instructions from the control device 100.

The second supply device 60 includes a pulverized coal supply unit 60A that supplies pulverized coal to the calciner 14 (the burners of the calciner 14), and a pulverized coal supply unit 60B that supplies pulverized coal to the rotary kiln 30 (the burners 36) (see Figure 1). The pulverized coal supply unit 60A may be configured in any manner as long as it is capable of supplying pulverized coal to the calciner 14 and adjusting the amount of supply. The pulverized coal supply unit 60B may be configured in any manner as long as it is capable of supplying pulverized coal to the rotary kiln 30 and adjusting the amount of supply. Each of the pulverized coal supply units 60A and 60B is configured, for example, similarly to the waste supply unit 50A shown in Figure 2.

The temperature measuring device 72 is a device that measures the temperature indicating the heating status of the cement raw materials in the calciner 14. The temperature measuring device 72 measures, for example, the temperature of the calciner 14. The temperature of the calciner 14 fluctuates depending on the heating status of the cement raw materials in the calciner 14. The temperature measuring device 72 is, for example, positioned at a distance from the calciner 14 and measures the temperature of the outer surface of the calciner 14. The temperature measuring device 72 may measure the temperature of the outer surface of the calciner 14 using any method. In one example, the temperature measuring device 72 may measure the temperature of the outer surface by detecting infrared rays or the like emitted from the outer surface of the calciner 14. The temperature measuring device 72 may measure the temperature of one location on the outer surface of the calciner 14, or may measure the temperature at two or more locations. The temperature measuring device 72 may measure the temperature of the outer surface near the outlet (upper part) of the calciner 14.

In place of or in addition to the temperature of the calciner 14, the temperature measuring device 72 may measure the temperature of the cement raw materials fed from cyclone C4 to the kiln end 32, or may measure the temperature of the high-temperature gas flowing from cyclone C4 to cyclone C3. The temperature measuring device 72 may measure the temperature of the cement raw materials fed to the kiln end 32 near the raw material outlet of cyclone C4. The temperature measuring device 72 may also measure the temperature of the high-temperature gas flowing toward cyclone C3 near the gas outlet of cyclone C4. The temperatures of the cement raw materials fed to the kiln end 32 and the high-temperature gas flowing toward cyclone C3 vary depending on the heating conditions of the cement raw materials in the calciner 14.

The temperature measuring device 74 is a device that measures the temperature indicating the heating status of the cement raw materials in the rotary kiln 30. The temperature measuring device 74 measures, for example, the temperature of the rotary kiln 30. The temperature measuring device 74 is, for example, arranged at a distance from the rotary kiln 30 and measures the temperature of the outer surface of the rotary kiln 30 (main body 34). The temperature measuring device 74 may measure the temperature of the outer surface of the rotary kiln 30 using any method. In one example, the temperature measuring device 74 may measure the temperature of the outer surface by detecting infrared rays or the like emitted from the outer surface of the rotary kiln 30. The temperature measuring device 74 may measure the temperature of one location on the outer surface of the rotary kiln 30, or may measure the temperature of two or more locations. Instead of or in addition to the temperature of the rotary kiln 30, the temperature measuring device 74 may measure the temperature of the exhaust gas heading toward the rising duct 16, or may measure the temperature of the clinker discharged to the clinker cooler 40.

(Control device)
The control device 100 is a computer that controls the manufacturing apparatus 2. The manufacturing system 1 may include an input/output device 102 connected to the control device 100. The input/output device 102 is a device for inputting instructions from an operator such as a worker into the control device 100 and for notifying the worker of information from the control device 100. The input/output device 102 may include a keyboard, an operation panel, or a mouse as an input device, and may include a monitor (e.g., a liquid crystal display) as an output device. The input/output device 102 may be a touch panel in which an input device and an output device are integrated. The control device 100 and the input/output device 102 may be integrated.

The control device 100 is configured to at least perform control (hereinafter referred to as "temperature tracking control") to adjust the amount of waste supplied to the calciner 14 so that the temperature indicating the heating status of the cement raw materials in the calciner 14 approaches the target temperature. This temperature tracking control includes setting a target amount of waste supplied to the calciner 14 so that the temperature indicating the heating status of the cement raw materials in the calciner 14 approaches the target temperature, and adjusting the amount of waste supplied to the calciner 14 (controlling the first supply device 50) so that the amount of waste supplied to the calciner 14 approaches the set target amount. Below, an example is described in which various controls are performed to bring the temperature of the calciner 14 closer to the target temperature.

As shown in FIG. 3, the control device 100 has, as its functional configuration (hereinafter referred to as "functional modules"), an input information acquisition unit 112, a temperature information acquisition unit 114, a control mode selection unit 116, a first supply control unit 122, a second supply control unit 124, and a notification unit 126. The processing performed by these functional modules corresponds to the processing performed by the control device 100.

The input information acquisition unit 112 is a functional module that acquires input information from an operator such as a worker via the input/output device 102. The temperature information acquisition unit 114 is a functional module that acquires information indicating the temperature of the calciner 14 from the temperature measurement device 72 and information indicating the temperature of the rotary kiln 30 from the temperature measurement device 74. The control mode selection unit 116 is a functional module that selects the control mode to be executed by the control device 100.

The first supply control unit 122 is a functional module that controls the first supply device 50 to adjust the amount of waste material supplied from the first supply device 50 to the calciner 14. The second supply control unit 124 is a functional module that controls the second supply device 60 to adjust the amount of pulverized coal supplied from the second supply device 60 to the calciner 14. The notification unit 126 is a functional module that outputs information indicating the status of the manufacturing apparatus 2 to the input/output device 102.

As shown in FIG. 4, the control device 100 has a circuit 150. The circuit 150 includes at least one processor 152, memory 154, storage 156, an input/output port 158, and a timer 162. The storage 156 stores programs for configuring each of the functional modules described above. The storage 156 is a computer-readable recording medium such as a hard disk, non-volatile semiconductor memory, a magnetic disk, or an optical disk.

Memory 154 temporarily stores programs loaded from storage 156, calculation results of processor 152, etc. Processor 152 configures each functional module by executing programs in cooperation with memory 154. In response to commands from processor 152, input/output port 158 inputs and outputs electrical signals between first supply device 50, second supply device 60, temperature measurement devices 72 and 74, input/output device 102, etc. Timer 162 counts clock pulses at a predetermined cycle in response to commands from processor 152 to measure elapsed time.

[Method of manufacturing cement clinker]
Cement clinker can be produced using the above-described production system 1. The method for producing cement clinker includes, for example, a supplying step, a preheating and calcining step, a firing step, and a cooling step.

In the supply process, the first supply device 50 supplies waste to each of the calciner 14 and the rotary kiln 30. Also, in the supply process, the second supply device 60 supplies pulverized coal to each of the burners of the calciner 14 and the burners 36 of the rotary kiln 30. In the supply process, the temperature of the calciner 14 is adjusted to approach the target temperature based on the measurement value of the temperature measuring device 72, and the temperature of the rotary kiln 30 is adjusted to approach the target temperature based on the measurement value of the temperature measuring device 74. The temperature adjustment of the calciner 14 and the temperature adjustment of the rotary kiln 30 may be performed in the same way. These temperature adjustments adjust the amount of waste, etc., supplied. An example of adjusting the temperature of the calciner 14 is described below.

In the process of adjusting the temperature of the calciner 14, the control mode executed by the control device 100 may be switched between a first control mode and a second control mode. In the first control mode, temperature tracking control is executed for the supply of waste material, and fixed-volume supply control is executed for the supply of pulverized coal. In the second control mode, temperature tracking control is executed for the supply of waste material, and temperature tracking control is executed for the supply of pulverized coal. Details of the first control mode, second control mode, temperature tracking control, and fixed-volume supply control will be described later.

In the preheating and calcining process, the preheater 10 preheats and calcines the cement raw materials. In the preheating and calcining process, the cement raw materials are calcined (heated) in the calciner 14 using at least waste and pulverized coal. In the firing process, the preheated and calcined cement raw materials are fired (heated) in the rotary kiln 30 using at least waste and pulverized coal, resulting in the production of cement clinker. In the cooling process, the cement clinker produced in the rotary kiln 30 is cooled in the clinker cooler 40. The cement clinker produced by the above manufacturing method is then subjected to a finishing process, including crushing, to produce cement.

(Control Method)
Next, an example of a method for controlling the manufacturing apparatus 2 by the control device 100 will be described. Fig. 5 is a flowchart showing an example of a series of processes executed by the control device 100. This series of processes is started, for example, when the manufacturing apparatus 2 starts operating, and is executed at predetermined intervals. In an initial state when the manufacturing apparatus 2 starts operating, the control mode executed by the control device 100 may be set to the first control mode.

As shown in FIG. 5, the control device 100 first executes step S11. In step S11, for example, the temperature information acquisition unit 114 acquires information indicating the temperature of the calciner 14 from the temperature measurement device 72. In one example, the temperature information acquisition unit 114 acquires information indicating the temperature at one predetermined location of the calciner 14 (hereinafter referred to as the "first temperature"), and acquires information indicating the temperature at another predetermined location of the calciner 14 (hereinafter referred to as the "second temperature"). The first temperature and the second temperature are measured at different locations, and both the first temperature and the second temperature are information indicating the temperature of the calciner 14. The first temperature is used to adjust the amount of waste supplied, and the second temperature is used to adjust the amount of pulverized coal supplied.

Next, the control device 100 executes steps S12 and S13. In step S12, for example, the control mode selection unit 116 calculates the deviation between the first temperature obtained in step S11 and a target temperature related to that first temperature. Hereinafter, the target temperature related to the first temperature will be referred to as the "first target temperature," and the deviation between the first temperature (measured value) and the first target temperature will be referred to as the "first temperature deviation." In step S13, for example, the control mode selection unit 116 selects the control mode to be executed by the control device 100 based on the first temperature deviation obtained in step S12. Details of step S13 will be described later.

Next, the control device 100 executes step S14. In step S14, for example, the control device 100 determines whether the control mode is set to the first control mode. If it is determined in step S14 that the control mode is set to the first control mode (step S14: YES), the processing executed by the control device 100 proceeds to step S15. In step S15, for example, the first supply control unit 122 executes temperature tracking control regarding the supply of waste from the first supply device 50 so that the first temperature of the calciner 14 approaches the first target temperature. Details of step S15 will be described later.

Next, the control device 100 executes step S16. In step S16, for example, the second supply control unit 124 executes fixed-quantity supply control, in which the second supply device 60 is controlled so that the amount of pulverized coal supplied to the calciner 14 falls within a predetermined range (target range). In one example, the second supply control unit 124 controls the second supply device 60 to reduce the difference between the measured value of the current supply amount of pulverized coal and a predetermined target supply amount. In fixed-quantity supply control, the second supply device 60 is controlled to supply pulverized coal at a fixed amount, regardless of the deviation between the second temperature of the calciner 14 and the target temperature for that second temperature (hereinafter referred to as the "second target temperature").

On the other hand, if it is determined in step S14 that the control mode is set to the second control mode (step S14: NO), the processing executed by the control device 100 proceeds to steps S17 and S18. In step S17, for example, the first supply control unit 122 executes temperature tracking control for the supply of waste, similar to step S15. In step S18, for example, the second supply control unit 124 executes temperature tracking control for the supply of pulverized coal. Details of steps S17 and S18 will be described later.

As a result, the control device 100 completes the series of processes for one cycle. In subsequent cycles, the control device 100 repeatedly executes the series of processes shown in Figure 5. In a cycle in which the first control mode is selected, the control device 100 executes temperature tracking control for the supply of waste and fixed-quantity supply control for the supply of pulverized coal. In a cycle in which the second control mode is selected, the control device 100 executes temperature tracking control for the supply of both waste and pulverized coal.

Figure 6 is a flowchart showing an example of the control mode selection process in step S13. In step S13, the control device 100 first executes step S31. In step S31, for example, the control mode selection unit 116 determines whether the current control mode is set to the first control mode.

If it is determined in step S31 that the current control mode is set to the first control mode (step S31: YES), the processing executed by the control device 100 proceeds to step S32. In step S32, for example, the control mode selection unit 116 determines whether a predetermined transition condition is met based on the first temperature deviation (deviation between the first temperature and the first target temperature) obtained in the above-mentioned step S12. The transition condition is a condition for transitioning the control mode from the first control mode to the second control mode, and is determined in advance by, for example, an operator, etc.

In the first control mode, pulverized coal is supplied so that the supply rate does not change over time, and the supply rate of waste is adjusted so that the temperature of the calciner 14 approaches the target temperature. Due to its characteristics, waste contains a variety of components, and the change over time in the calories (heat content) of the waste supplied to the calciner 14 tends to be more unstable than the change over time in the calories of the pulverized coal supplied to the calciner 14. Therefore, when an operating state (state of the manufacturing apparatus 2) is reached in which it is believed that the temperature of the calciner 14 cannot be maintained stably by simply adjusting the amount of waste supplied, a transition condition is set to transition to the second control mode.

In one example, the control mode selection unit 116 determines that the transition condition is met when the first temperature deviation obtained in the current cycle exceeds the first threshold. Alternatively, the control mode selection unit 116 determines that the transition condition is met when the state in which the first temperature deviation exceeds the second threshold exceeds a predetermined set period. The control mode selection unit 116 may also determine that the transition condition is met when the first temperature deviation exceeds the second threshold in the current cycle and in multiple cycles immediately preceding that cycle.

The control mode selection unit 116 may determine that the transition condition is met when either of the two conditions exemplified above is met. Specifically, the control mode selection unit 116 may determine that the transition condition is met when the first temperature deviation in the current cycle exceeds the first threshold, or when the state in which the first temperature deviation exceeds the second threshold exceeds the set period. The first threshold and second threshold are determined in advance, for example, by an operator, and the second threshold is a value smaller than the first threshold. The second threshold may be a threshold for determining whether adjustment of the amount of waste material supplied is necessary.

If it is determined in step S32 that the transition condition is met (step S32: YES), the processing executed by the control device 100 proceeds to step S33. In step S33, for example, the control mode selection unit 116 sets the control mode of the control device 100 to the second control mode instead of the first control mode.

Next, the control device 100 executes step S34. In step S34, for example, the notification unit 126 notifies an operator or the like of information indicating that the control mode of the control device 100 has transitioned to the second control mode. In one example, the notification unit 126 displays information indicating the transition to the second control mode on a monitor included in the input/output device 102. This allows an operator or the like to know that the system has entered an operating state in which it is difficult to maintain a stable temperature in the calciner 14 by simply adjusting the amount of waste material supplied.

If it is determined in step S32 that the transition condition is not met (step S32: NO), the control device 100 ends step S13 without executing steps S33 and S34. In this case, the control mode of the control device 100 remains in the first control mode.

Depending on the cycle, the second control mode may already be set (transitioned) when step S13 is executed. If it is determined in step S31 that the control mode of the control device 100 is set to the second control mode (step S31: NO), the processing executed by the control device 100 proceeds to step S35. In step S35, for example, the control mode selection unit 116 determines whether an instruction to transition to the first control mode has been received from an operator or the like.

After transitioning to the second control mode, the worker or the like may check the progress of information indicating the temperature of the calciner 14 on the monitor of the input/output device 102. The notification unit 126 may periodically display information indicating the first temperature and the second temperature on the monitor of the input/output device 102. When the worker or the like determines from the progress of the temperature of the calciner 14 that the temperature has stabilized, the worker or the like may input an instruction to transition to the first control mode to the control device 100 via the input/output device 102.

If it is determined in step S35 that there is no instruction from an operator or the like to transition to the first control mode (step S35: NO), the control device 100 ends the processing of step S13 without executing any other steps. In this case, the control mode of the control device 100 remains in the second control mode.

On the other hand, if it is determined in step S35 that an instruction to transition to the first control mode has been received from an operator or the like (step S35: YES), the processing executed by the control device 100 proceeds to step S36. In step S36, for example, the control mode selection unit 116 sets the control mode of the control device 100 to the first control mode instead of the second control mode.

To summarize the processing of step S13 above, when the control mode is set to the first control mode, if the above transition conditions are met, the control mode will transition to the second control mode; if the above transition conditions are not met, the control mode will remain in the first control mode. On the other hand, when the control mode is set to the second control mode, if an instruction to transition is received from an operator or other person, the control mode will transition (return) to the first control mode; if an instruction to transition is not received from an operator or other person, the control mode will remain in the second control mode.

Next, the temperature tracking control of steps S15, S17, and S18 will be described using Figure 7. Each of these temperature tracking controls involves cascade control, which combines feedback control in two stages to bring the temperature of the calciner 14 closer to the target temperature. When performing the temperature tracking control of steps S15 and S17, the control device 100 executes steps S51 to S54 shown in Figure 7.

In temperature tracking control of waste supply, the control device 100 first executes step S51. In step S51, for example, the first supply control unit 122 sets a target supply amount of waste to the calciner 14 (hereinafter referred to as the "first target supply amount") so that the first temperature of the calciner 14 approaches the first target temperature. In one example, the first supply control unit 122 sets the first target supply amount so as to reduce the first temperature deviation between the first temperature and the first target temperature (the temperature deviation obtained in step S12). The first supply control unit 122 may calculate the first target supply amount by performing a proportional operation, a proportional-integral operation, or a proportional-integral-differential operation on the first temperature deviation.

Next, the control device 100 executes steps S52 and S53. In step S52, for example, the first supply control unit 122 acquires information indicating the current supply amount of waste to the calciner 14 from the first supply device 50 (transport amount measurement unit 58). In step S53, for example, the first supply control unit 122 calculates the deviation between the first target supply amount set in step S51 and the current supply amount obtained in step S52 (hereinafter referred to as the "first supply amount deviation").

Next, the control device 100 executes step S54. In step S54, for example, the first supply control unit 122 adjusts the controlled amount of the first supply device 50 so that the amount of waste supplied to the calciner 14 approaches the first target supply amount set in step S51. In one example, the first supply control unit 122 adjusts the movement speed of the conveyor 54 of the first supply device 50 in accordance with the first supply amount deviation calculated in step S53 so as to reduce the first supply amount deviation. The first supply control unit 122 may calculate the current value to the motor driving the conveyor 54 by performing a proportional operation, a proportional-integral operation, or a proportional-integral-differential operation on the first supply amount deviation.

When performing the temperature tracking control of step S18, the control device 100 executes steps S61 to S64 shown in FIG. 7. In the temperature tracking control related to the supply of pulverized coal, the control device 100 first executes step S61. In step S61, for example, the second supply control unit 124 sets a target supply amount of pulverized coal to the calciner 14 (hereinafter referred to as the "second target supply amount") so that the second temperature of the calciner 14 approaches the second target temperature.

In one example, the second supply control unit 124 acquires information indicating the second temperature of the calciner 14 from the temperature measurement device 72 and calculates the deviation between the second temperature and the second target temperature (hereinafter referred to as the "second temperature deviation"). The second supply control unit 124 then sets the second target supply amount in accordance with the second temperature deviation so as to reduce the second temperature deviation. The second supply control unit 124 may calculate the second target supply amount by performing a proportional operation, a proportional-integral operation, or a proportional-integral-differential operation on the second temperature deviation.

Next, the control device 100 executes steps S62 and S63. In step S62, for example, the second supply control unit 124 acquires information indicating the current supply amount of pulverized coal to the calciner 14 from the second supply device 60. In step S63, for example, the second supply control unit 124 calculates the deviation between the second target supply amount set in step S61 and the current supply amount obtained in step S62 (hereinafter referred to as the "second supply amount deviation").

Next, the control device 100 executes step S64. In step S64, for example, the second supply control unit 124 adjusts the controlled variable of the second supply device 60 so that the supply amount of pulverized coal to the calciner 14 approaches the second target supply amount set in step S61. In one example, the second supply control unit 124 adjusts the controlled variable correlated with the supply amount of pulverized coal (e.g., the movement speed of the conveyor that transports the pulverized coal) in accordance with the second supply amount deviation calculated in step S63 so as to reduce the second supply amount deviation. The second supply control unit 124 may calculate a command value for the controlled variable by performing a proportional operation, a proportional-integral operation, or a proportional-integral-differential operation on the second supply amount deviation.

In the series of processes executed by the control device 100, steps S15 and S16 are repeatedly executed at a predetermined cycle while the control mode is set to the first control mode. That is, the second supply device 60 is controlled so that the supply amount of pulverized coal falls within a certain range, while cascade control is executed in the first supply device 50 so that the temperature of the calciner 14 approaches the target temperature. In this case, the control device 100 executes fixed-quantity supply control to supply a constant amount of pulverized coal during a period that overlaps at least partially with the execution period of temperature tracking control (first supply control) related to the supply of waste.

In the series of processes executed by the control device 100, if the deviation between the first temperature of the calciner 14 and the first target temperature (first temperature deviation) satisfies a predetermined condition while the control mode is set to the first control mode, the control device 100 transitions to the second control mode. In this way, if the first temperature deviation satisfies a predetermined condition while temperature tracking control for the supply of waste is being executed, the control device 100 starts temperature tracking control for the supply of pulverized coal (second supply control).

In the series of processes executed by the control device 100, steps S17 and S18 are repeatedly executed at a predetermined cycle while the control mode is set to the second control mode. That is, cascade control is executed in the first supply device 50 and cascade control is executed in the second supply device 60 so that the temperature of the calciner 14 approaches the target temperature. In this case, the control device 100 executes temperature tracking control (second supply control) for the supply of pulverized coal during a period that overlaps with at least a portion of the execution period of temperature tracking control (first supply control) for the supply of waste. In the control for the supply of pulverized coal, the above-mentioned fixed quantity supply control is executed before the temperature tracking control begins.

The amount of waste material supplied from the first supply device 50 to the calciner 14 may be greater than the amount of pulverized coal supplied from the second supply device 60 to the calciner 14. For example, while the control mode of the control device 100 is set to at least the first control mode, the amount of waste material supplied from the first supply device 50 is greater than the amount of pulverized coal supplied from the second supply device 60. While the control mode is set to the second control mode, in addition to while the control mode is set to the first control mode, the control device 100 may control the first supply device 50 and the second supply device 60 so that the amount of waste material supplied is greater than the amount of pulverized coal supplied.

[Modification]
The above-described series of processes is an example and can be modified as appropriate. In the above-described series of processes, the control device 100 may execute one step and the next step in parallel, or may execute each step in an order different from that of the above-described example. The control device 100 may omit any step, or may execute a process in any step different from that of the above-described example.

Unlike the above example, when the second control mode is set, the control device 100 may perform temperature tracking control regarding the supply of pulverized coal and control the first supply device 50 to stop the supply of waste. That is, when the second control mode is selected, the control device 100 may perform step S18 without performing step S17. When the second control mode is set, the control device 100 may perform temperature tracking control regarding the supply of pulverized coal and control the first supply device 50 so that the amount of waste supplied falls within a certain range regardless of the temperature of the calciner 14. That is, when the second control mode is selected, the control device 100 may perform fixed quantity supply control regarding the supply of waste and perform step S18.

The first target temperature and the second target temperature may be set to different values, or may be set to the same value. The temperature at one location in the calciner 14 may be used to adjust the amount of waste material supplied, and the temperature at that location may also be used to adjust the amount of pulverized coal supplied. In other words, the first temperature and the second temperature may be temperatures measured at the same location in the calciner 14. The first temperature and the second temperature may each be any temperature that indicates the heating status of the cement raw materials in the calciner 14.

The transition conditions are not limited to the above example. If the change in the first temperature over time exceeds a predetermined determination threshold, the control device 100 may determine that the transition conditions are met and transition from the first control mode to the second control mode. The first supply control unit 122 may not execute steps S51 to S54 if the first temperature deviation is below the second threshold described above, but may execute steps S51 to S54 if the first temperature deviation is equal to or greater than the second threshold.

The control mode of the control device 100 does not have to be switched. In this case, the control device 100 may execute cascade control of the first supply device 50 and cascade control of the second supply device 60 in parallel while the manufacturing apparatus 2 is operating. Figure 8 is a flowchart showing another example of a series of processes executed by the control device 100. This series of processes is initiated, for example, in response to the start of operation of the manufacturing apparatus 2, similar to the series of processes shown in Figure 5, and is executed at predetermined intervals.

In the series of processes shown in FIG. 8, the control device 100 first executes step S91, similar to step S11. Next, the control device 100 executes step S92. In step S92, for example, the first supply control unit 122 calculates a first temperature deviation, which is the difference between the first temperature of the calciner 14 and the first target temperature. Also, in step S92, for example, the second supply control unit 124 calculates a second temperature deviation, which is the difference between the second temperature of the calciner 14 and the second target temperature.

Next, the control device 100 executes step S93, similar to step S15 (or S17). Then, the control device 100 executes step S94, similar to step S18. The control device 100 repeatedly executes the series of processes from steps S91 to S94 in subsequent cycles. In this series of processes, cascade control is continued in the first supply device 50 and cascade control is continued in the second supply device 60 so that the temperature of the calciner 14 approaches the target temperature. In this case, the control device 100 executes temperature tracking control (second supply control) for the supply of pulverized coal during a period that overlaps at least a portion of the execution period of temperature tracking control (first supply control) for the supply of waste.

Regarding the supply of waste and pulverized coal to the rotary kiln 30, the supply amount may be adjusted as in the various examples described above. The control device 100 (temperature information acquisition unit 114) may acquire information indicating a temperature (e.g., the temperature of the rotary kiln 30) that indicates the heating status of the cement raw material in the rotary kiln 30 from the temperature measurement device 74. The first supply control unit 122 may perform temperature tracking control regarding the supply of waste to the rotary kiln 30. This temperature tracking control includes, for example, setting a target supply amount of waste to the rotary kiln 30 so that the temperature of the rotary kiln 30 (measured by the temperature measurement device 74) approaches the target temperature, and adjusting the supply amount to the rotary kiln 30 so that it approaches the target supply amount.

The first supply device 50 may supply waste to both the calciner 14 and the rotary kiln 30. The second supply device 60 may supply pulverized coal to the rotary kiln 30 without supplying pulverized coal to the calciner 14. In this case, the control device 100 may adjust the temperature of the calciner 14 by adjusting the amount of waste supplied from the first supply device 50. Because the heating temperature in the calciner 14 is lower than the heating temperature in the rotary kiln 30, the temperature of the calciner 14 may be stable even without supplying pulverized coal to the calciner 14. On the other hand, because the rotary kiln 30 requires heating the cement raw materials at high temperatures, using pulverized coal together with the waste makes it easier to produce cement clinker.

The manufacturing apparatus 2 may supply an energy source other than pulverized coal to the calciner 14, and may supply an energy source other than pulverized coal to the rotary kiln 30. The energy source other than pulverized coal may have a stable calorie content compared to waste, similar to pulverized coal. Examples of energy sources other than pulverized coal include waste oil, C heavy oil, ammonia, and hydrogen. The manufacturing apparatus 2 may include an energy source supply unit that supplies an energy source including at least one selected from the group consisting of pulverized coal, waste oil, C heavy oil, ammonia, and hydrogen to at least one of the calciner 14 and the rotary kiln 30. With regard to the supply of the energy source to the calciner 14 or the rotary kiln 30, fixed-volume supply control may be performed in the first control mode, and temperature tracking control (cascade control) may be performed in the second control mode, similar to the supply of pulverized coal described above.

[Effects of the embodiment]
In the manufacturing system 1 described above, the control device 100 executes a first supply control that includes setting a first target supply amount of waste to the calciner 14 so that the first temperature of the calciner 14, which indicates the heating status of the cement raw material in the calciner 14, approaches the first target temperature, and controlling the waste supply unit 50A so that the supply amount of waste to the calciner 14 approaches the first target supply amount.

Feedback control can be considered to bring the temperature of the calciner 14 closer to the target value. In this feedback control, for example, the current value for the motor included in the conveyor 54 of the waste supply unit 50A is directly calculated from the deviation between the measured temperature and the target value, and the current value is output from the control device 100 to adjust the amount of waste supplied to the calciner 14. However, with this control, if a disturbance occurs, such as a blockage of some waste in the waste supply unit 50A, a discrepancy occurs between the actual supply amount and the target supply amount required to bring the calciner 14 closer to the target temperature. In this case, control is performed to correct the discrepancy in the supply amount after a change in the temperature of the calciner 14 due to the discrepancy occurs. This significantly increases the impact of the disturbance on the temperature of the calciner 14. In contrast, in the manufacturing system 1, a target supply amount is set to bring the actual supply amount closer to the target temperature, and the waste supply unit 50A is controlled so that the actual supply amount approaches the target supply amount. Therefore, even if the above-mentioned disturbances occur, the difference between the actual supply amount and the target supply amount is resolved relatively quickly, so the impact on the temperature of the calciner 14 is small. As a result, the temperature of the calciner 14 can be stabilized even when waste is supplied, which is useful for stabilizing the quality of cement clinker. Note that the same effect can be achieved when the temperature of the cement raw material from cyclone C4 to the kiln end 32, or the temperature of the high-temperature gas from cyclone C4 to cyclone C3, is set as the control target.

The manufacturing apparatus 2 may have an energy source supply unit that supplies the calciner 14 with an energy source containing at least one selected from the group consisting of coal, waste oil, C heavy oil, ammonia, and hydrogen. Because waste materials contain a variety of components, their calories tend to be unstable. For example, if waste materials supplied at a certain time contain waste plastics with significantly different calories, the temperature of the calciner 14 will fluctuate greatly. In contrast, supplying the above energy source together with the waste materials can further stabilize the temperature of the calciner 14. This is therefore even more useful for stabilizing the quality of cement clinker.

The control device 100 may execute a second supply control, which includes setting a second target supply amount of the energy source to the calciner 14 so that a second temperature of the calciner 14, which indicates the heating status of the cement raw materials in the calciner 14, approaches the second target temperature, and controlling the energy source supply unit so that the supply amount of the energy source to the calciner 14 approaches the second target supply amount. The control device 100 may also start the second supply control when a first temperature deviation between the first temperature of the calciner 14 and the first target temperature satisfies a predetermined condition while the first supply control is being executed. From the perspective of waste recycling, it is desirable to use a larger amount of waste for heating in the calciner 14, but the calories of the waste tend to be unstable. In the above configuration, the second supply control is executed when the first temperature deviation satisfies the predetermined condition, thereby making it possible to more stabilize the temperature of the calciner 14 compared to before the execution of the second supply control. This is therefore useful for achieving both an increase in the amount of waste used and a stabilized temperature in the calciner 14.

Before initiating the second supply control, the control device 100 may execute fixed-quantity supply control, which controls the energy source supply unit so that the amount of energy source supplied to the calciner 14 falls within a predetermined range. Changing the supply amount from a non-zero state to a certain supply amount is easier to accomplish in a short time than changing the energy source supply amount from a zero state to a certain supply amount. In the above configuration, since the transition from fixed-quantity supply control occurs when the second supply control is initiated, the effect of the second supply control on the supply of the energy source is quickly reflected in the temperature of the calciner 14. This is therefore even more useful for stabilizing the temperature of the calciner 14.

The control device 100 may execute the second supply control during a period that overlaps with at least a portion of the execution period of the first supply control. In this case, the temperature of the calciner 14 is adjusted by both adjusting the amount of waste supplied and adjusting the amount of energy source supplied, making it easier to stabilize the temperature of the calciner 14 compared to when only the amount of waste supplied is adjusted. This is therefore even more useful for stabilizing the temperature of the calciner 14.

The amount of waste material supplied from the waste material supply unit 50A may be greater than the amount of pulverized coal supplied from the pulverized coal supply unit 60A. In this manufacturing system 1, waste material is supplied while suppressing temperature fluctuations in the calciner 14. This is therefore useful for reducing coal usage while minimizing the impact of waste material supply.

1... cement clinker manufacturing system, 2... cement clinker manufacturing apparatus, 14... calciner, 30... rotary kiln, 50A, 50B... waste supply section, 60A, 60B... pulverized coal supply section, 100... control device.

Claims (10)

an apparatus for producing cement clinker, the apparatus comprising: a heating unit that heats cement raw materials; a waste material supply unit that supplies waste materials including waste plastics to the heating unit; and an energy source supply unit that supplies an energy source including at least one selected from the group consisting of coal, waste oil, C heavy oil, ammonia, and hydrogen to the heating unit;
a control device for controlling the manufacturing apparatus,
the control device executes a first supply control including setting a first target supply amount of the waste to the heating section so that a temperature indicating a heating state of the cement raw material in the heating section approaches a target temperature, and controlling the waste supply section so that the supply amount of the waste to the heating section approaches the first target supply amount;
the control device executes second supply control, which includes setting a second target supply amount of the energy source to the heating unit so that a temperature indicating the heating state of the cement raw material in the heating unit approaches a target temperature, and controlling the energy source supply unit so that the supply amount of the energy source to the heating unit approaches the second target supply amount,
the control device starts the second supply control when, during execution of the first supply control, a deviation between a temperature indicating the heating status of the cement raw material in the heating unit and a target temperature exceeds a predetermined threshold, or when a duration during which the deviation exceeds the predetermined threshold exceeds a predetermined set period . The manufacturing system according to claim 1, wherein the control device performs quantitative supply control to control the energy source supply unit so that the amount of the energy source supplied to the heating unit falls within a predetermined range before starting the second supply control. an apparatus for producing cement clinker, the apparatus comprising: a heating unit that heats cement raw materials; a waste material supply unit that supplies waste materials including waste plastics to the heating unit; and an energy source supply unit that supplies an energy source including at least one selected from the group consisting of coal, waste oil, C heavy oil, ammonia, and hydrogen to the heating unit;
a control device for controlling the manufacturing apparatus,
the control device executes a first supply control including setting a first target supply amount of the waste to the heating section so that a temperature indicating a heating state of the cement raw material in the heating section approaches a target temperature, and controlling the waste supply section so that the supply amount of the waste to the heating section approaches the first target supply amount;
the control device executes second supply control, which includes setting a second target supply amount of the energy source to the heating unit so that a temperature indicating the heating state of the cement raw material in the heating unit approaches a target temperature, and controlling the energy source supply unit so that the supply amount of the energy source to the heating unit approaches the second target supply amount,
The control device executes the second supply control during a period that overlaps with at least a portion of an execution period of the first supply control. the energy source supply unit supplies coal as the energy source;
4. The manufacturing system according to claim 1 , wherein the amount of the waste material supplied from the waste material supply unit is greater than the amount of the coal supplied from the energy source supply unit. heating the cement raw material in a heating section;
A step of supplying waste containing waste plastic to the heating section by a waste supply section ;
supplying an energy source including at least one selected from the group consisting of coal, waste oil, C heavy oil, ammonia, and hydrogen to the heating section by an energy source supply section;
controlling the waste supply and the energy source supply;
In the step of controlling the waste material supply unit and the energy source supply unit, a first supply control and a second supply control are executed,
The first supply control
setting a first target supply amount of the waste to the heating section so that a temperature indicating a heating state of the cement raw material in the heating section approaches a target temperature;
controlling the waste supply unit so that the amount of the waste supplied to the heating unit approaches the first target supply amount;
The second supply control is
setting a second target supply amount of the energy source to the heating section so that a temperature indicating a heating state of the cement raw material in the heating section approaches a target temperature;
controlling the energy source supply unit so that the supply amount of the energy source to the heating unit approaches the second target supply amount;
In the step of controlling the waste supply unit and the energy source supply unit, the second supply control is started when, during execution of the first supply control, a deviation between a temperature indicating the heating status of the cement raw material in the heating unit and a target temperature exceeds a predetermined threshold, or when the duration of the state in which the deviation exceeds the predetermined threshold exceeds a predetermined set period . heating the cement raw material in a heating section;
A step of supplying waste containing waste plastic to the heating section by a waste supply section;
supplying an energy source including at least one selected from the group consisting of coal, waste oil, C heavy oil, ammonia, and hydrogen to the heating section by an energy source supply section;
controlling the waste supply and the energy source supply;
In the step of controlling the waste material supply unit and the energy source supply unit, a first supply control and a second supply control are executed,
The first supply control
setting a first target supply amount of the waste to the heating section so that a temperature indicating a heating state of the cement raw material in the heating section approaches a target temperature;
controlling the waste supply unit so that the amount of the waste supplied to the heating unit approaches the first target supply amount;
The second supply control is
setting a second target supply amount of the energy source to the heating section so that a temperature indicating a heating state of the cement raw material in the heating section approaches a target temperature;
controlling the energy source supply unit so that the supply amount of the energy source to the heating unit approaches the second target supply amount;
In the step of controlling the waste material supply unit and the energy source supply unit, the second supply control is executed during a period overlapping with at least a portion of an execution period of the first supply control. A control device for controlling a cement clinker production apparatus having a heating unit that heats cement raw materials, a waste material supply unit that supplies waste materials including waste plastics to the heating unit, and an energy source supply unit that supplies an energy source including at least one selected from the group consisting of coal, waste oil, C heavy oil, ammonia, and hydrogen to the heating unit ,
a first supply control is executed, the first supply control including: setting a first target supply amount of the waste to the heating section so that a temperature indicating a heating state of the cement raw material in the heating section approaches a target temperature; and controlling the waste supply section so that the supply amount of the waste to the heating section approaches the first target supply amount;
execute a second supply control including: setting a second target supply amount of the energy source to the heating section so that a temperature indicating the heating state of the cement raw material in the heating section approaches a target temperature; and controlling the energy source supply section so that the supply amount of the energy source to the heating section approaches the second target supply amount;
a control device that starts the second supply control when, during execution of the first supply control, a deviation between a temperature indicating the heating status of the cement raw material in the heating section and a target temperature exceeds a predetermined threshold, or when a duration during which the deviation exceeds the predetermined threshold exceeds a predetermined set period . A control device for controlling a cement clinker production apparatus having a heating unit that heats cement raw materials, a waste material supply unit that supplies waste materials including waste plastics to the heating unit, and an energy source supply unit that supplies an energy source including at least one selected from the group consisting of coal, waste oil, C heavy oil, ammonia, and hydrogen to the heating unit,
a first supply control is executed, the first supply control including: setting a first target supply amount of the waste to the heating section so that a temperature indicating a heating state of the cement raw material in the heating section approaches a target temperature; and controlling the waste supply section so that the supply amount of the waste to the heating section approaches the first target supply amount;
execute a second supply control including: setting a second target supply amount of the energy source to the heating section so that a temperature indicating the heating state of the cement raw material in the heating section approaches a target temperature; and controlling the energy source supply section so that the supply amount of the energy source to the heating section approaches the second target supply amount;
A control device that executes the second supply control during a period that overlaps with at least a portion of a period during which the first supply control is executed. A program for causing a computer to execute a control method for controlling a cement clinker manufacturing apparatus having a heating unit that heats cement raw materials, a waste material supply unit that supplies waste materials including waste plastics to the heating unit, and an energy source supply unit that supplies an energy source including at least one selected from the group consisting of coal, waste oil, C heavy oil, ammonia, and hydrogen to the heating unit ,
The control method includes controlling the waste supply unit and the energy source supply unit;
In the step of controlling the waste material supply unit and the energy source supply unit, a first supply control and a second supply control are executed,
The first supply control
setting a first target supply amount of the waste to the heating section so that a temperature indicating a heating state of the cement raw material in the heating section approaches a target temperature;
controlling the waste supply unit so that the amount of the waste supplied to the heating unit approaches the first target supply amount;
The second supply control is
setting a second target supply amount of the energy source to the heating section so that a temperature indicating a heating state of the cement raw material in the heating section approaches a target temperature;
controlling the energy source supply unit so that the supply amount of the energy source to the heating unit approaches the second target supply amount;
In the step of controlling the waste supply unit and the energy source supply unit, the program starts the second supply control when, during execution of the first supply control, a deviation between a temperature indicating the heating status of the cement raw material in the heating unit and a target temperature exceeds a predetermined threshold, or when the duration of the state in which the deviation exceeds the predetermined threshold exceeds a predetermined set period. A program for causing a computer to execute a control method for controlling a cement clinker manufacturing apparatus having a heating unit that heats cement raw materials, a waste material supply unit that supplies waste materials including waste plastics to the heating unit, and an energy source supply unit that supplies an energy source including at least one selected from the group consisting of coal, waste oil, C heavy oil, ammonia, and hydrogen to the heating unit,
The control method includes controlling the waste supply unit and the energy source supply unit;
In the step of controlling the waste material supply unit and the energy source supply unit, a first supply control and a second supply control are executed,
The first supply control
setting a first target supply amount of the waste to the heating section so that a temperature indicating a heating state of the cement raw material in the heating section approaches a target temperature;
controlling the waste supply unit so that the amount of the waste supplied to the heating unit approaches the first target supply amount;
The second supply control is
setting a second target supply amount of the energy source to the heating section so that a temperature indicating a heating state of the cement raw material in the heating section approaches a target temperature;
controlling the energy source supply unit so that the supply amount of the energy source to the heating unit approaches the second target supply amount;
In the step of controlling the waste material supply unit and the energy source supply unit, the second supply control is executed during a period that overlaps with at least a portion of an execution period of the first supply control.