JP7629897B2 - Heat recovery boiler system control device, heat recovery boiler system control method, and program - Google Patents

Description

This disclosure relates to a control device for a heat recovery boiler system, a control method for a heat recovery boiler system, and a program.

In incinerators such as waste incinerator boilers, soda recovery boilers, and coal-fired boilers, as well as in the furnaces and flues of boiler furnaces, fuels such as coal and waste contain chlorine, heavy metals, sulfur, vanadium, etc., which can cause corrosion of metal materials such as boiler superheater tubes. However, since there is a large variation in fuel properties, especially in waste incinerator boilers, it is difficult to predict the lifespan of boiler superheater tubes in advance.

For example, the following Patent Document 1 discloses a heat recovery plant that includes a corrosion detection means for detecting corrosion of metal parts of a boiler, a corrosive environment monitoring means for monitoring the corrosive environment of the boiler based on information from the corrosion detection means and detecting when the corrosive environment becomes severe, and that, when the corrosive environment of the boiler becomes severe, estimates the cause of the severe corrosive environment based on at least one of the incinerator throughput, the amount of combustion air supplied to the incinerator, the amount of steam generated by the boiler, and the amount of heat generated, determines measures to alleviate the corrosive environment, and controls the operation of the incinerator to alleviate the corrosive environment based on the determined measures.

Patent No. 5767486

However, in the heat recovery plant described in Patent Document 1, controlling the operation of the combustion furnace has the disadvantage of causing a decrease in operating performance (such as failure to achieve the planned processing volume and a decrease in heat recovery efficiency). In view of the above problems, the present disclosure aims to provide a control device for a heat recovery boiler system, a control method for a heat recovery boiler system, and a program that can suppress corrosion by monitoring the corrosion state in real time.

In order to solve the above-mentioned problems and achieve the objectives, the heat recovery boiler system of the present disclosure includes an acquisition unit that acquires a first measurement value indicating measurement data from an ultrasonic sensor and a second measurement value indicating measurement data from a two-electrode sensor, an estimation unit that estimates at least one of the amount of thinning of the probe and the melting of ash adhering to the probe based on at least one of the first measurement value and the second measurement value, a judgment unit that judges an operation command for treatment of the adhering ash based on the estimation result of the estimation unit, and an operation control unit that controls the operation of at least one of a water injection device that lowers the gas temperature and a soot removal device that removes adhering ash as treatment for thinning and adhering ash based on the judgment result of the judgment unit.

In order to solve the above-mentioned problems and achieve the objectives, the control method for a heat recovery boiler system disclosed herein includes the steps of acquiring a first measurement value indicating measurement data from an ultrasonic sensor and a second measurement value indicating measurement data from a two-electrode sensor, estimating at least one of the amount of thinning of the probe and melting of ash adhering to the probe based on at least one of the first measurement value and the second measurement value, determining an operation command for treatment of the adhering ash based on the estimation result, and controlling the operation of at least one of a water injection device that lowers the gas temperature and a soot removal device that removes adhering ash as treatment for the thinning and adhering ash based on the determination result.

In order to solve the above-mentioned problems and achieve the objective, the program of the present disclosure causes a computer to execute the following steps: acquiring a first measurement value indicating measurement data from an ultrasonic sensor and a second measurement value indicating measurement data from a two-electrode sensor; estimating at least one of the amount of thinning of the probe and the melting of ash adhering to the probe based on at least one of the first measurement value and the second measurement value; determining an operation command for treatment of the adhering ash based on the estimation result; and controlling the operation of at least one of a water injection device that lowers the gas temperature and a soot removal device that removes the adhering ash as treatment for the thinning and adhering ash based on the determination result.

According to the present disclosure, it is possible to provide a control device for a heat recovery boiler system, a control method for a heat recovery boiler system, and a program that can monitor the corrosion state in real time and suppress corrosion.

FIG. 1 is a schematic diagram showing a configuration example of a heat recovery boiler system according to the present disclosure. FIG. 2 is a diagram illustrating a configuration example of a control device according to the present disclosure. FIG. 3 is a diagram illustrating an example of information stored in the driving data storage unit according to the present disclosure. FIG. 4 is a diagram illustrating an example of a time series change in the first measurement value according to the present disclosure. FIG. 5 is a diagram illustrating an example of a time series change in the second measurement value according to the present disclosure. FIG. 6 is a diagram illustrating an example of information stored in a model storage unit according to the present disclosure. FIG. 7 is a flowchart showing a flow of a first embodiment of the control method and program for a heat recovery boiler system according to the present disclosure. FIG. 8 is a flowchart showing a flow of a second embodiment of the control method and program for a heat recovery boiler system according to the present disclosure. FIG. 9 is a flowchart showing a flow of a third aspect of the control method and program for a heat recovery boiler system according to the present disclosure.

Embodiments of the present disclosure are described in detail below with reference to the drawings. Note that the present disclosure is not limited to the embodiments described below.

(Configuration of heat recovery boiler system)
Fig. 1 is a schematic diagram showing a configuration example of a heat recovery boiler system 10 according to the present disclosure. As shown in Fig. 1, the heat recovery boiler system 10 according to the present disclosure includes an incinerator 200 and a boiler furnace 300, and includes a high-temperature corrosion monitoring probe 310 (310A, 310B, 310C), a soot removal device 320 (320A, 320B, 320C), a heat exchanger 330 (330A, 330B, 330C), and a water injection device 340 inside the boiler furnace 300.

The incinerator 200 receives fuel from a fuel supply device 202 and burns the fuel in the incinerator. The incinerator 200 burns garbage (waste), black liquor, coal, petroleum, biomass, asphalt, etc. as fuel to generate combustion gas G. In this embodiment, the incinerator is an incinerator that decommissions objects, but the present invention can be applied to a combustion furnace that burns fuel. The incinerator in FIG. 1 is a schematic diagram of a stoker type incinerator. The incinerator 200 may be realized by a pulverized coal combustion furnace, an oil/gas combustion furnace, a stoker type incinerator, a fluidized bed incinerator, a shaft type gasification melting furnace, a fluidized bed type gasification melting furnace, a kiln type gasification melting furnace, etc. The combustion gas G from the incinerator 200 is supplied to the inside of the boiler furnace 300, and heat is recovered from the combustion gas G by superheating the steam circulating inside the heat exchanger 330.

The boiler furnace 300 is equipped with various heat exchangers 330, which recover heat from the combustion gas G generated in the incinerator 200. The boiler furnace 300 is equipped with heat exchangers 330, such as an evaporator, superheater, and economizer, which recover heat from the combustion gas G to water. When the combustion gas G that flows into the boiler furnace 300 comes into contact with these heat exchangers 330, heat is transferred from the combustion gas G to the heat transport medium flowing through the heat exchangers 330.

The high-temperature corrosion monitoring probe 310 (hereinafter referred to as the "probe") is equipped with a thin ultrasonic sensor and a two-electrode sensor, and detects the amount of thinning of the probe 310 and the melting state of the attached ash. As shown in FIG. 1, the probe 310 is provided on the upstream side of the combustion gas G of the heat exchanger 330. The probe 310 is manufactured to simulate the heat transfer tube of the heat exchanger 330. Therefore, the amount of thinning of the probe 310 and the melting state of the attached ash may be regarded as the amount of thinning of the heat transfer tube of the corresponding heat exchanger 330 and the melting state of the attached ash. The thin ultrasonic sensor provided on one side of the thickness direction of the probe 310 is equipped with a piezoelectric element, and by applying a high-frequency voltage to the piezoelectric element, the piezoelectric element is vibrated at a high frequency to transmit ultrasonic waves, which are transmitted inside the probe 310, and the reflected wave of the ultrasonic waves from the opposite end equipped with the piezoelectric element of the probe 310 is received, and the wall thickness is calculated based on the time interval until the reflected wave is received. The two-electrode sensor installed in the probe 310 detects the melting of the adhering ash by measuring the current value between electrodes that are not electrically connected to each other when a conductive liquid is generated by the melting of the adhering ash.

Normal ultrasonic sensors are too large to be installed in narrow spaces such as the inside of the probe 310, and may be difficult to install. In addition, normal ultrasonic sensors have problems with heat resistance. Furthermore, when the probe 310 is installed in a corrosive environment exposed to high-temperature combustion gas G, there is a problem that the durability is not sufficient to withstand long-term operation. On the other hand, the thin ultrasonic sensor of the present application can easily measure multiple locations. In addition, two-electrode sensors have a simple structure and excellent durability, and do not induce adhesion like multiple electrodes. In addition, when the thickness of the attached ash increases, the two-electrode sensor can grasp it by increasing the contact area between the attached ash and the electrode and reducing the resistance, and it is possible to obtain a lot of information about the phenomenon even with a simple structure.

The soot removal device 320 is a device that removes soot and ash attached to the heat transfer tube of the heat exchanger 330 of the boiler furnace 300. As shown in FIG. 1, the soot removal device 320 is provided upstream of the combustion gas G of the heat exchanger 330. The soot removal device 320 may be, for example, a shock pulse type soot blower. The shock pulse type soot blower fills the inside of the soot blower with combustible gas, generates a shock wave by the explosion of the combustible gas, and removes soot by the shock wave. By using the shock pulse type soot blower, it is possible to eliminate the need to use the steam generated in the boiler furnace 300 for soot removal , and therefore, compared to the case where a soot removal device using steam generated in the boiler furnace 300 is used, it is possible to reduce steam loss, and therefore the heat recovery efficiency of the heat recovery boiler system 10 can be increased.

The heat exchanger 330 recovers heat from the combustion gas G to a heat transport medium. A plurality of heat exchangers 330 are provided in the boiler furnace 300. The heat exchanger 330 may be, for example, an evaporator, a superheater, or a coal economizer. These recover heat by using water as a heat transport medium, and transferring heat from the combustion gas G from the heat transfer tube to the water flowing inside the heat transfer tube that constitutes the heat exchanger 330 by thermal conduction or heat transfer.

The water injection device 340 is provided upstream of the gas flow with respect to the heat exchanger 330, and injects water into the inside of the boiler furnace 300 to cool the gas and lower the gas temperature when the combustion gas G reaches the heat exchanger 330. The water injection device 340 may be composed of, for example, an injection nozzle, a heat-resistant hose, and a pump unit. In addition, in FIG. 1, an example is shown in which the injection nozzle of the water injection device 340 is provided protruding from the left and right sides of the incinerator 200, but it may be provided protruding from the side of the incinerator 200 in the front direction and the side of the incinerator 200 in the back direction. In addition, a heat-resistant hose may be suspended from the top surface of the incinerator 200, and an injection unit to which an injection nozzle is attached and connected to the heat-resistant hose may be provided inside the incinerator 200, and water may be injected from the injection nozzle from the center of the incinerator 200 toward the side of the incinerator 200. Alternatively, the injection nozzle may be provided with an opening in the wall that forms the side of the incinerator 200, and the injection nozzle may not protrude into the interior of the incinerator 200.

1, the probe 310, the soot removal device 320, and the water injection device 340 are connected to the control device 100. These devices connected to the control device 100 operate based on signals transmitted by the control device 100. The control device 100 will be described below.

(Configuration of the control device)
The control device 100 manages the heat recovery boiler system 10, and supervises and controls various devices and apparatuses that constitute the heat recovery boiler system 10. The configuration of the control device 100 will be described with reference to Fig. 2. Fig. 2 is a diagram showing an example of the configuration of the control device according to the present disclosure. The control device 100 includes a communication unit 110, a storage unit 120, a control unit 130, an input unit 140, and a display unit 150.

The communication unit 110 transmits and receives information from various devices and apparatuses that constitute the heat recovery boiler system 10. The communication unit 110 may be realized, for example, by various dedicated wired lines or wireless communication with security measures.

The memory unit 120 is a storage device that stores various information such as programs used in the processing of the control unit 130 and operating data of the heat recovery boiler system 10. The memory unit 120 may be realized, for example, by a combination of semiconductor memory elements such as RAM (Random Access Memory), ROM (Read Only Memory), and flash memory, a hard disk, SSD (Solid State Drive), optical disk, etc.

The storage unit 120 includes an operation data storage unit 121 and a model storage unit 122. Different types of information are stored in the operation data storage unit 121 and the model storage unit 122. An example of the information stored therein is described below.

The operation data storage unit 121 stores various measurement values and information related to the operation status that occur during the operation of the heat recovery boiler system 10. Here, an example of information stored in the operation data storage unit 121 is described with reference to FIG. 3.

Figure 3 is a diagram showing an example of information stored in the operation data storage unit according to the present disclosure. As shown in Figure 3, the operation data storage unit 121 stores information related to various environmental conditions and operation-related items that affect corrosion, such as "measurement date and time," "first measurement value," "second measurement value," "pressure value," and "temperature value," in association with each other.

"Measurement date and time" is information indicating the date and time when various measurement values were measured. "First measurement value" is information indicating the measurement value of a thin ultrasonic sensor. "Second measurement value" is information indicating the measurement value of a two-electrode sensor. "Pressure value" is information indicating the measurement value of a pressure measuring instrument. "Temperature value" is information indicating the measurement value of a temperature measuring instrument.

In other words, in FIG. 3, the first measurement value "FMD#1", the second measurement value "SMD#1", the pressure value "PD#1", and the temperature value "TD#1" measured at the measurement date and time "TM#1" are linked and stored.

The information stored in the operation data storage unit 121 is not limited to information related to the items of "measurement date and time", "first measurement value", "second measurement value", "pressure value", and "temperature value", and may store data related to the operation of the heat recovery boiler system 10, such as the combustion chamber temperature, the superheater tube (SH) inlet gas temperature, the processing volume, and the evaporation volume. Furthermore, together with these stored data, data periodically measuring the actual amount of thinning of the superheater tube may be stored in association with the stored data. This makes it clear that if the combustion chamber temperature or the SH inlet gas temperature is high, the calorie of the waste as fuel is high in the first place. Furthermore, if the corrosion rate is also high, it becomes easier to determine whether soot removal or water spraying is necessary.

Here, the time series changes in the first measurement value and the second measurement value will be explained using Figures 4 and 5, respectively. Figure 4 is a diagram showing the time series changes in the measurement value of the thin ultrasonic sensor according to the present disclosure. The horizontal axis of Figure 4 indicates the operating time of the heat recovery boiler system 10 in months. The vertical axis of Figure 4 indicates the time series changes in the thickness of the probe 310 estimated using the first measurement value. As shown in Figure 4, it can be seen that the thickness of the probe 310 tends to decrease as the operating time progresses.

The time series change of the second measurement value will be explained using FIG. 5. FIG. 5 is a diagram showing the time series change of the measurement value of the two-electrode sensor according to the present disclosure. The horizontal axis of FIG. 5 shows the operation time of the heat recovery boiler system 10 in units of months. The vertical axis of FIG. 5 shows the current between the electrodes as the second measurement value. As shown in FIG. 5, when a current is measured between the two electrodes, it is estimated that, for example, the gas temperature has risen due to a change in the quality of the waste, and the surface temperature of the probe 310 has risen accordingly, and the attached ash has been heated and melted. In addition, by comparing with the timing at which the amount of reduction in the probe thickness shown in the graph shown in FIG. 4 has increased, it is also possible to estimate the relationship between the melting of the attached ash and the tendency of thinning. In this way, by using the measurement value of the two-electrode sensor, it is possible to estimate the change in the properties of the waste put into the incinerator 200 and the melting state of the attached ash. For example, when burning waste with a high chlorine content such as plastic, the combustion chamber temperature rises, and the amount of adhesion and melting increases, thereby increasing the corrosion rate. Furthermore, when burning waste with a high content of lead (Pb), zinc (Zn), or copper (Cu), the amount of melting increases, the corrosion rate increases, and there are few other changes. Furthermore, when there is a large variation in calories, such as with plastics, the temperature of the combustion chamber also varies greatly, the amount of adhesion increases, the amount of melting varies, and the corrosion rate increases. Furthermore, when there is a large variation in calories, such as with waste with a high moisture content, the temperature of the combustion chamber also varies greatly, and the amount of melting varies greatly. By using the measured values of the two-electrode sensor, it is possible to estimate changes in the properties of the waste as described above that has been put into the incinerator 200.

The operating data storage unit 121 is not limited to information related to the items "measurement date and time," "first measured value," "second measured value," "pressure value," and "temperature value," and may store information related to any other operating data.

The model storage unit 122 stores multiple models. FIG. 6 is a diagram showing an example of information stored in the model storage unit according to the present disclosure.

In the example shown in FIG. 6, the model storage unit 122 stores information related to the items "model ID" and "model data" in association with each other.

"Model ID" is an identifier that identifies the machine learning model and is represented by a character string, a number, etc. "Model data" indicates the model data of the machine learning model. For example, "model data" stores data for a model that outputs various types of driving assistance information and information on corrosion conditions when driving data is input. For example, the machine learning model may be a neural network, a Bayesian network, a support vector machine, a soft sensor, etc.

That is, in FIG. 4, the model identified by the model ID "M#1" indicates the machine learning model M#1. Also, the model data "MDT#1" indicates the model data of the machine learning model M#1.

Here, if the machine learning model is a neural network, the model data "MDT#1" includes various information such as, for example, coupling information on how the nodes included in each of the multiple layers that make up the neural network are coupled to each other, and coupling coefficients that are multiplied by the numerical values input and output between coupled nodes.

The model storage unit 122 is not limited to information related to the items "model ID" and "model data", and may store information related to any other machine learning model.

The control unit 130 is a controller that manages and controls the control device 100. The control unit 130 is realized by a CPU (Central Processing Unit) or an MPU (Micro Processing Unit) executing various programs stored in the storage unit 13 using the RAM as a working area. The control unit 130 may also be realized by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).

The control unit 130 includes an acquisition unit 131, an estimation unit 132, a judgment unit 133, an operation control unit 134, and an operation control unit 135. The control unit 130 realizes these by reading and executing a program from the storage unit 120. In other words, these are realized by a set of processes described in the program. The control unit 130 executes these processes by following the descriptions of the program. Note that the control unit 130 may execute these processes using one CPU, or may be equipped with multiple CPUs and execute these processes using the multiple CPUs.

The acquisition unit 131 acquires a first measurement value indicating the measurement data of the thin ultrasonic sensor, and a second measurement value indicating the measurement data of the two-electrode sensor. For example, the acquisition unit 131 may acquire the first measurement value and the second measurement value from the thin ultrasonic sensor and the two-electrode sensor, respectively, via a measurement line connected to the communication unit 110. After acquiring the first measurement value and the second measurement value, the acquisition unit 131 stores the acquired first measurement value and second measurement value in the operating data storage unit 121 of the storage unit 120.

The estimation unit 132 estimates at least one of the thinning state of the probe 310 and the corrosion state of the probe 310 based on at least one of the first measurement value and the second measurement value. For example, the estimation unit 132 estimates the amount of thinning of the probe 310 based on the first measurement value. Here, the amount of thinning of the probe 310 means the amount of thinning of the probe 310, which is a dummy superheater tube. Since the probe 310 simulates a superheater tube, the amount of thinning of the probe 310 is considered to be a value that is close to the amount of thinning of the superheater. The first measurement value indicating the measurement data of the thin ultrasonic sensor indicates the thickness of the probe 310. Therefore, the amount of thinning of the probe 310 can be estimated by subtracting the thickness of the probe 310 indicated by the first measurement value from the initial value of the thickness of the probe 310. The estimation unit 132 may also estimate a predicted value of the amount of thinning using a model that is machine-learned from a database that accumulates the first measurement values.

For example, the estimation unit 132 estimates the corrosion state of the probe 310 based on the second measurement value. The second measurement value, which indicates the measurement data of the two-electrode sensor, indicates the current value flowing between the two electrodes when melting of the attached ash occurs. Therefore, it is considered that the larger the current value indicated by the second measurement value, the more molten material with low electrical resistance has been generated. In addition, it is considered that the longer the time during which the current value indicated by the second measurement value flows, the more the amount of molten material generated by melting of the attached ash is, and the more current is continuously flowing between the two electrodes. Based on such an estimation, the estimation unit 132 estimates the molten state of the attached ash of the probe 310 based on the second measurement value. The estimation unit 132 may also estimate a prediction of the molten state of the attached ash using a model that has been machine-learned from a database that has accumulated the second measurement value. In addition, the estimation unit 132 may estimate a prediction value of the amount of thinning by learning the correlation between the amount of thinning of the probe and the melting of the attached ash.

The determination unit 133 determines an operation command for processing the attached ash based on the estimation result of the estimation unit 132. That is, the determination unit 133 determines an operation command for at least one of the water injection device 340, the soot removal device 320, and the incinerator 200. That is, the determination unit 133 determines an operation command including whether or not to operate at least one of the water injection device 340, the soot removal device 320, and the incinerator 200, or to transition the operation state, based on the amount of thinning and the corrosion state estimated by the estimation unit 132. That is, the operation command is a command signal indicating an operation command for these devices and equipment.

For example, the judgment unit 133 judges whether the amount of metal loss estimated by the estimation unit 132 is equal to or greater than a predetermined value, or whether the molten material has been in a molten state for a relatively long time, and judges to operate the water injection device 340 if the amount of metal loss is equal to or greater than the predetermined value. Here, the predetermined value is a preset value that is a criterion for judging whether to operate the water injection device 340. For example, the predetermined value may be a value that is arbitrarily set statistically based on data accumulated from the operating performance of the heat recovery boiler system 10. Alternatively, the predetermined value may be a value that is arbitrarily set based on empirical rules established from the long-term experience of the operator of the heat recovery boiler system 10. In addition, the predetermined value may be set to a different value for each probe 310. Note that, since there is a possibility that the target heat recovery amount of the boiler cannot be satisfied due to water injection, in that case, the amount of recovered heat may be adjusted by increasing the processing amount to create a state in which the operating temperature is raised.

Furthermore, when melting of the attached ash estimated by the estimation unit 132 has occurred or when the rate of wall thinning is progressing faster than in a normal state, the determination unit 133 determines to operate the soot removal device 320. For example, when the estimation unit 132 estimates based on the second measurement value that melting of the attached ash has occurred in the probe 310, the determination unit 133 determines to operate the soot removal device 320 corresponding to the probe 310 in which melting of the attached ash is estimated to have occurred.

In addition, when the estimation unit 132 estimates that melting of the attached ash has occurred in multiple probes 310, the judgment unit 133 judges that the temperature of the incinerator 200 should be lowered within a range that does not affect operation, or that the gas temperature should be lowered by injecting water using the water injection device 340. Here, the number of multiple probes 310 may be set to any number based on the past operating results of a similar type of heat recovery boiler system 10. For example, in a case where the boiler furnace 300 of the heat recovery boiler system 10 is equipped with three heat exchangers 330, each of which is equipped with one probe 310, for a total of three probes 310, when melting of the attached ash is estimated in more than half, i.e., two or more probes 310, the judgment unit 133 may judge that the temperature of the incinerator 200 should be lowered within a range that does not affect operation, or that the gas temperature should be lowered by injecting water using the water injection device 340.

Furthermore, the determination unit 133 may detect the melting state of the attached ash by an on or off response, and may also evaluate the molten salt corrosion risk time from the integral of the number of times the attached ash has melted and the melting time of the attached ash, and may use the evaluation result to determine the operation of the soot removal device 320 or the water injection device 340. That is, the evaluation may be based on this parameter itself, or may be combined with other parameters. For example, the evaluation may be based on the correlation between the amount of thinning of the probe 310 and the molten salt corrosion risk time. The evaluation may also be based on the correlation between the wall thickness measurement results (periodic inspection) of an actual heat transfer tube and the molten salt corrosion risk time.

In addition, the judgment unit 133 may detect (monitor) the amount of thinning of the heat transfer tube and the increase in the amount of melted ash attached, estimate the corrosion progress of the entire heat recovery equipment based on the detection results, and judge the operation based on the corrosion progress. The operation of the soot removal device 320 and the water injection device 340 may be judged by the following steps. That is, the amount of thinning of the heat transfer tube and the increase in the amount of melted ash attached are monitored by the ultrasonic sensor and the two-electrode sensor of the probe 310 to estimate the corrosion progress of the entire heat recovery equipment. Then, when the corrosion progress is large, the corrosion temperature environment is reduced by spraying water on the upstream side of the heat recovery equipment. It is preferable to use wastewater from the plant as the spray water. The corrosion progress may be judged by taking into consideration the detection results of multiple sensors, either the same probe or different probes. In addition to the data acquired by the probe 310, the operating conditions of the boiler (fuel properties, air ratio, evaporation amount, etc.) and the wall thickness measurement results (regular inspection results) of the actual heat transfer tube may also be taken into consideration. These results allow us to estimate the corrosion rate distribution and its factors based on the relationship between the corrosion rate and the operating conditions, and even to evaluate and update the estimated results of the corrosion rate distribution of the furnace heat transfer tubes.

The operation control unit 134 controls the operation of the treatment for the attached ash based on the judgment result of the judgment unit 133. That is, the operation control unit 134 controls the operation of at least one of the water injection device 340 and the soot removal device 320. For example, when the judgment unit 133 judges to operate the water injection device 340 based on the fact that the amount of metal loss is equal to or greater than a predetermined value, the operation control unit 134 controls the operation of the water injection device 340. This makes it possible to reduce the corrosive temperature environment.

Furthermore, when the determination unit 133 determines to operate the corresponding soot removal device 320 based on the estimation that melting of the attached ash has occurred, the operation control unit 134 performs control to operate the soot removal device 320. Since a plurality of probes 310 are provided, it is possible to remove the attached ash attached to the heat transfer tube of the heat exchanger 330 where melting of the attached ash is estimated to have occurred by operating the soot removal device 320 corresponding to the probe 310 where melting of the attached ash has occurred.

The operation control unit 135 controls the operation of the incinerator 200 based on the judgment result of the judgment unit 133. When the judgment unit 133 estimates that melting of attached ash has occurred in multiple probes 310 and judges that the temperature of the incinerator 200 should be lowered to a range that does not affect operation, or that the gas temperature should be lowered by injecting water from the water injection device 340, the operation control unit 135 performs control to lower the operating temperature of the incinerator 200. For example, if the incinerator 200 is a stoker-type incinerator, control is performed to reduce the amount of air blown from the blower or to reduce the amount of waste fed into the incinerator 200.

The input unit 140 accepts operations of the heat recovery boiler system 10 from the operator. The input unit 140 may be realized by various input devices such as a mouse or a keyboard. The input unit 140 may also be realized by a dedicated operation panel combining multiple switches. The heat recovery boiler system 10 operates according to the operations input to the input unit 140 by the operator.

The display unit 150 is a display device that displays various information such as operation information and operating status of the heat recovery boiler system 10. The display unit 150 receives information to be displayed from the control unit 130 and displays various information based on the received information. This allows the operator of the heat recovery boiler system 10 to grasp the operating status and make decisions and judgments regarding the operation of various devices according to the operating status. The display unit 150 may be realized by a display device such as a liquid crystal display, an organic EL (Electro Luminescence) display, or a micro LED (Light Emitting Diode) display. The display unit 150 may be realized by combining multiple display devices in order to enable the operator to instantly grasp a large amount of information.

(Control method and program for heat recovery boiler system)
Next, a control method and a program for the heat recovery boiler system 10 according to the present disclosure will be described with reference to FIGS.

(First aspect)
7 is a flowchart showing a flow of a first aspect of the control method and program for a heat recovery boiler system according to the present disclosure. The control method for the heat recovery boiler system 10 according to the first aspect will be described with reference to FIG.

First, the control device 100 acquires measurement data including a first measurement value indicating measurement data of the thin ultrasonic sensor and a second measurement value indicating measurement data of the two-electrode sensor (step S1). Next, the control device 100 estimates at least one of the amount of thinning of the probe 310 and the melting of the ash adhering to the probe 310 based on at least one of the first measurement value and the second measurement value (step S2). Next, the control device 100 determines whether the amount of thinning is equal to or greater than a predetermined value (step S3). Next, if the amount of thinning is equal to or greater than a predetermined value (step S3: Yes), the control device 100 controls the water injection device 340 to operate (step S4). Note that if the amount of thinning is not equal to or greater than the predetermined value (step S3: No), the control device 100 ends the process. These processes may be written in a program to be executed by a computer provided in the control device 100, and the computer may execute the process by the program.

This makes it possible to control the operation of the soot removal device 320 in accordance with the amount of wall thinning and the melting of the attached ash. Therefore, it becomes possible to appropriately operate the soot removal device 320 in accordance with the monitoring of the probe 310.

(Second Aspect)
8 is a flowchart showing a flow of a second aspect of the control method and program for a heat recovery boiler system according to the present disclosure. The control method for the heat recovery boiler system 10 according to the second aspect will be described with reference to FIG. 8.

In the control method for the heat recovery boiler system 10 of the second embodiment, steps S10 to S20 are the same as steps S1 to S2 of the control method for the heat recovery boiler system 10 of the first embodiment. Next, the control device 100 judges whether or not melting of the adhering ash has occurred (step S30). If it is judged that melting of the adhering ash has occurred (step S30: Yes), the control device 100 operates the soot removal device 320 (step S40). If it is judged that melting of the adhering ash has not occurred (step S30: No), the control device 100 ends the process. These processes may be written in a program to be executed by a computer included in the control device 100, and the computer may be executed by the program.

This makes it possible to operate the soot removal device 320 when the adhering ash is melted. Therefore, it becomes possible to appropriately operate the soot removal device 320 in response to the monitoring of the probe 310.

(Third aspect)
9 is a flowchart showing a flow of a third aspect of the control method and program for a heat recovery boiler system according to the present disclosure. The control method for the heat recovery boiler system 10 according to the third aspect will be described with reference to FIG.

The control method for the heat recovery boiler system 10 of the third aspect performs the same processing from step S100 to step S200 as steps S1 to S2 of the control method for the heat recovery boiler system 10 of the first aspect. Next, the control device 100 determines whether the amount of thinning of the probes 310 at multiple locations is equal to or greater than a predetermined value (step S300). If the amount of thinning of the multiple probes 310 is equal to or greater than a predetermined value (step S300: Yes), the control device 100 controls to lower the operating temperature (step S400). If the amount of thinning of the multiple probes 310 is not equal to or greater than the predetermined value (step S300: No), the control device 100 ends the processing. These processes may be written in a program to be executed by a computer provided in the control device 100, and the computer may execute the process via the program.

As a result, if melting of adhering ash occurs in multiple probes 310, the operating temperature can be reduced. This makes it possible to reduce the risk of high-temperature corrosion due to exposure to a high-temperature environment.

(Composition and Effects)
The present disclosure discloses the following inventions, but is not limited to the following.
(1) A control device for a heat recovery boiler system comprising: an acquisition unit 131 that acquires a first measurement value indicating measurement data of an ultrasonic sensor and a second measurement value indicating measurement data of a two-electrode sensor; an estimation unit 132 that estimates at least one of the amount of thinning of the probe 310 and the melting of ash adhering to the probe 310 based on at least one of the first measurement value and the second measurement value; a judgment unit 133 that judges an operation command for at least one of a water injection device and a soot removal device as a treatment for the adhering ash based on the estimation result of the estimation unit 132; and an operation control unit 134 that controls the operation of the treatment for the adhering ash based on the judgment result of the judgment unit 133.

According to this configuration, it is possible to provide a control device capable of suppressing corrosion by monitoring the corrosion state in real time. According to this configuration, it is possible to appropriately perform the process of reducing and removing the attached ash by controlling any one of the water injection device 340, the soot removal device 320, and the combustion furnace.

(2) A control device for a heat recovery boiler system described in (1), in which the judgment unit 133 judges to operate the water injection device 340 corresponding to the probe 310 whose amount of thinning of the probe 310 estimated by the estimation unit 132 is equal to or greater than a predetermined value when the amount of thinning of the probe 310 estimated by the estimation unit 132 is equal to or greater than a predetermined value.

With this configuration, when the thickness of the probe 310 is thinning, the corrosive temperature environment can be reduced by operating the water injection device 340.

(3) A control device for a heat recovery boiler system described in (1) or (2), in which the judgment unit 133 judges, when the estimation unit 132 estimates that the ash adhering to the probe 310 has melted, to operate the soot removal device 320 corresponding to the probe 310 in which the melting of the adhering ash has occurred.

According to this configuration, when melting of the adhering ash is estimated, the adhering ash can be removed by operating the soot removal device 320 corresponding to the probe 310 where the melting of the adhering ash has occurred. Therefore, it is possible to provide the control device 100 for the heat recovery boiler system 10 capable of suppressing corrosion.

(4) The control device for a heat recovery boiler system described in any one of (1) to (3) further includes an operation control unit 135 that determines to lower the operating temperature of the combustion furnace when the estimation unit 132 estimates that the adhering ash has melted in the multiple probes, and controls the operation of the combustion furnace based on the judgment result of the judgment unit 133.

With this configuration, if melting of adhering ash occurs in multiple probes 310, the operating temperature of the combustion furnace can be lowered. Therefore, it is possible to provide a control device 100 for a heat recovery boiler system 10 that can suppress corrosion.

(5) A control device for a heat recovery boiler system described in any one of (1) to (4), in which the judgment unit 133 detects the melting status of the adhering ash by an on or off response, and evaluates it as a molten salt corrosion risk time by integrating the number of times the adhering ash has melted and the melting time of the adhering ash, and uses the evaluation result to determine the operation of the soot removal device 320 or the water injection device 340.

This configuration makes it possible to provide a heat recovery boiler system 10 that can monitor the corrosion state in real time and suppress corrosion.

(6) A control device for a heat recovery boiler system described in any one of (1) to (5), in which the judgment unit 133 detects the amount of thinning of the heat transfer tube and the increase in the amount of melted attached ash, estimates the degree of corrosion of the entire heat recovery equipment based on the detection results, and judges the operation of the soot removal device or the water injection device based on the degree of corrosion.

This configuration makes it possible to provide a heat recovery boiler system 10 that can monitor the corrosion state in real time and suppress corrosion.

(7) A method for controlling a heat recovery boiler system, comprising the steps of: acquiring a first measurement value indicating measurement data of an ultrasonic sensor and a second measurement value indicating measurement data of a two-electrode sensor; estimating at least one of an amount of thinning of the probe 310 and melting of ash adhering to the probe 310 based on at least one of the first measurement value and the second measurement value; determining the operation of a treatment for the adhering ash based on the estimation result; and controlling the operation of at least one of a water injection device and a soot removal device as a treatment for the adhering ash based on the determination result.

This configuration provides a method for controlling the heat recovery boiler system 10 that can monitor the corrosion state in real time and suppress corrosion.

(8) A program for a heat recovery boiler system that causes a computer to execute the steps of: acquiring a first measurement value indicating measurement data from an ultrasonic sensor and a second measurement value indicating measurement data from a two-electrode sensor; estimating at least one of the amount of thinning of the probe 310 and the melting of ash adhering to the probe 310 based on at least one of the first measurement value and the second measurement value; determining the operation of a treatment for the adhering ash based on the estimation result; and controlling the operation of at least one of the water injection device and the soot removal device by treating the adhering ash based on the determination result.

This configuration makes it possible to provide a program that can monitor the corrosion state in real time and suppress corrosion.

Although the embodiments of the present disclosure have been described above, the embodiments are not limited to the contents of these embodiments. The above-described components include those that a person skilled in the art can easily imagine, those that are substantially the same, and those that are within the so-called equivalent range. Furthermore, the above-described components can be combined as appropriate. Furthermore, various omissions, substitutions, or modifications of the components can be made without departing from the spirit of the above-described embodiments.

REFERENCE SIGNS LIST 10 Heat recovery boiler system 100 Control device 110 Communication unit 120 Memory unit 121 Operation data memory unit 122 Model memory unit 130 Control unit 131 Acquisition unit 132 Estimation unit 133 Determination unit 134 Operation control unit 135 Operation control unit 140 Input unit 150 Display unit 200 Incinerator 300 Boiler furnace 310 High temperature corrosion monitoring probe (probe)
320 Soot removal equipment 330 Heat exchanger

Claims (6)

an acquisition unit that acquires a first measurement value indicating measurement data of the ultrasonic sensor and a second measurement value indicating measurement data of the two-electrode sensor;
An estimation unit that estimates the amount of thinning of the probe and the melting of ash adhering to the probe using a model that is machine-learned from a database that accumulates at least one of the first measurement value and the second measurement value;
A determination unit that determines an operation command for processing the wall thinning and the adhered ash based on the estimation result of the estimation unit;
An operation control unit that controls the operation of at least one of the water injection device and the soot removal device based on the judgment result of the judgment unit as a treatment for thinning and attached ash ,
The determination unit determines to operate a water injection device or a soot removal device provided upstream of the gas flow corresponding to the probe when the amount of thinning of the probe estimated by the estimation unit is equal to or greater than a predetermined value,
When the estimation unit estimates that the ash adhering to the probe has melted, the estimation unit determines to operate a water injection device or a soot removal device that is provided upstream of the gas flow with respect to the probe.
Heat recovery boiler system control device. The determination unit determines to lower an operating temperature of the combustion furnace when the estimation unit estimates that the attached ash has melted in the multiple probes, and
An operation control unit that controls the operation of the combustion furnace based on the judgment result of the judgment unit,
The control device for a heat recovery boiler system according to claim 1 . The judgment unit detects the melting state of the attached ash by an on or off response, and evaluates the molten salt corrosion risk time from the integral of the number of times the attached ash has melted and the melting time of the attached ash, and judges the operation of the soot removal device or the water injection device using the evaluation result.
The control device for a heat recovery boiler system according to claim 1 . The judgment unit detects the amount of thinning of the heat transfer tube and the increase in the amount of melted ash adhered to the heat recovery equipment based on the detection result, estimates the degree of corrosion of the entire heat recovery equipment, and judges the operation of the soot removal device or the water injection device based on the degree of corrosion.
The control device for a heat recovery boiler system according to claim 1 . Obtaining a first measurement value indicative of measurement data of the ultrasonic sensor and a second measurement value indicative of measurement data of the two-electrode sensor;
A step of estimating the amount of thinning of the probe and the melting of ash adhering to the probe using a model obtained by machine learning of a database in which at least one of the first measurement value and the second measurement value is stored ;
A step of determining an operation command for processing the wall thinning and the attached ash based on the estimation result;
and controlling the operation of at least one of the water injection device and the soot removal device based on the judgment result as a treatment for the thinning and the attached ash .
In the determining step, when the amount of thinning of the probe estimated in the estimating step is equal to or greater than a predetermined value, it is determined to operate a water injection device or a soot removal device provided upstream of the gas flow corresponding to the probe;
In the step of estimating, when it is estimated that the ash adhering to the probe has melted, it is determined to operate a water injection device or a soot removal device provided upstream of the gas flow with respect to the probe.
A method for controlling a heat recovery boiler system. Obtaining a first measurement value indicative of measurement data of the ultrasonic sensor and a second measurement value indicative of measurement data of the two-electrode sensor;
A step of estimating the amount of thinning of the probe and the melting of ash adhering to the probe using a model obtained by machine learning of a database in which at least one of the first measurement value and the second measurement value is stored ;
A step of determining an operation command for processing the wall thinning and the attached ash based on the estimation result;
and controlling the operation of at least one of the water injection device and the soot removal device based on the judgment result as a treatment for the thinning and the attached ash .
In the determining step, when the amount of thinning of the probe estimated in the estimating step is equal to or greater than a predetermined value, it is determined to operate a water injection device or a soot removal device provided upstream of the gas flow corresponding to the probe;
In the step of estimating, when it is estimated that the ash adhering to the probe has melted, it is determined to operate a water injection device or a soot removal device provided upstream of the gas flow relative to the probe;
A program that causes a computer to execute the following.

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