JP6832041B2 - Energy management system and energy management method - Google Patents

Description

Embodiments of the present invention relate to energy management systems and energy management methods.

In recent years, energy management systems have been attracting attention as energy-saving technologies, but none of them can provide sufficient data to read trends in power consumption. A conventional method is known to predict the amount of electric power used for rolling per rolled material (see Patent Document 1).

In other technologies, it is stated that tracking data and energy consumption are linked and aggregated for each rolled product (see Patent Document 2).

Japanese Unexamined Patent Publication No. 2001-321810 JP-A-2014-110727

Patent Document 1 cannot provide sufficient data to read a trend of power consumption such as in which zone in one rolling line the power consumption is biased. Therefore, when taking energy saving measures, it is difficult to narrow down the target to be taken.

In Patent Document 2, there is no description regarding an aggregation method in which tracking data and energy consumption are linked and aggregated for each rolled product, and "visualization" of the aggregation result is not mentioned.

An embodiment of the present invention provides an energy management system and an energy management method that aggregates and outputs energy consumption for each zone in a rolling line for each product identification data.

The energy management system according to the embodiment includes an energy management device that holds an identification data that identifies a product manufactured based on a production plan in the rolling plant and a database that includes data associated with the identification data, and the rolling plant. The provided drive device includes a control device that outputs control signals related to operation based on the production plan. One or more of the driving devices are provided in a plurality of steps of the rolling plant. The energy management device collects data on power consumption for each drive device based on the control signal in time series from the control device, and holds the data in association with each identification data, and the power consumption of each of the identification data. The power consumption is calculated based on the data related to the power consumption, and the power consumption is added over the period in which the data related to the power consumption is collected to calculate the energy for each of the plurality of steps. The calculation results for each of the steps are output for each of the identification data so that they can be visually recognized separately. When the driving device drives an electric motor, the power consumption data includes data on the rotation speed of the electric motor and data on the torque of the electric motor.

In the present embodiment, the power consumption of each of a plurality of processes can be aggregated in chronological order for each product identification data, and the energy can be calculated and output. Therefore, the tendency of the energy consumption of each product and each process. Can be grasped, and energy saving measures can be effectively planned and implemented.

It is a schematic diagram which shows an example of the rolling line of steel. It is a block diagram which illustrates the energy management system which concerns on embodiment. FIG. 3A is a schematic diagram showing a data structure for explaining the operation of the energy management system of the embodiment. FIG. 3B is a calculation flowchart for explaining the operation of the energy management system of the embodiment. It is a schematic diagram of an example of the output screen of the energy management system of the embodiment. It is a schematic diagram of an example of the output screen of the energy management system of the embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The drawings are schematic or conceptual, and the relationship between the thickness and width of each part, the ratio of the sizes between the parts, and the like are not necessarily the same as those in reality. Further, even when the same parts are represented, the dimensions and ratios may be different from each other depending on the drawings.
In addition, in the present specification and each figure, the same elements as those described above with respect to the above-mentioned figures are designated by the same reference numerals, and detailed description thereof will be omitted as appropriate.

FIG. 1 is a schematic view showing an example of a steel rolling line.
As shown in FIG. 1, the rolling line 10 includes a heating furnace 12, a rough rolling mill 14, a finishing rolling mill 16, a winder 18, and a scale removing device 20. In this example, the rolling line 10 performs hot rolling.

The heating furnace 12 heats the material to be rolled (slab) 2a produced in the upstream process to a temperature required for hot rolling. The heating furnace 12 heats, for example, the material 2a to be rolled to a temperature of about 1200 ° C.

The rough rolling mill 14 forms an intermediate material (coarse bar) 2b from the material 2a to be rolled by rolling the material 2a to be rolled to a predetermined plate thickness and width. For the rough rolling mill 14, for example, a reversible rolling mill is used. In this example, two rough rolling mills 14 arranged in the transport direction of the material to be rolled 2a (intermediate material 2b) are provided on the rolling line 10. The number of the rough rolling mills 14 is not limited to two, and may be one or three or more.

The finish rolling mill 16 further rolls the intermediate material 2b to form a hot-rolled steel sheet 2c from the intermediate material 2b. As the finishing rolling mill 16, for example, a tandem rolling mill in which a plurality of finishing stands F1 to F7 are arranged in the transport direction is used. In this example, seven finishing stands F1 to F7 are provided. The number of finishing stands is not limited to seven, and may be any number.

The take-up machine 18 winds the hot-rolled steel sheet 2c formed by the finish rolling machine 16 into a coil shape. The winder 18 forms a rolling coil.

The scale removing device 20 includes nozzle portions 22, 24, a pump 30, and a pipe 32. The nozzle portions 22, 24 and the pump 30 are fluidly connected by a pipe 32. A fluid such as water is circulated in the pipe 32, and this fluid is driven by the pump 30 and ejected from the nozzles 22a of the nozzle portions 22 and 24. The fluid is ejected onto the surface of the steel plate such as the slab 2a and the intermediate material 2b to be conveyed, and removes the scale formed on the surface.

Although not shown, the rolling line is provided with feed rollers, table rollers, and the like for transporting the rolled material in the transport direction along the pass line, in addition to the above.

The mill of the rolling mill, the table roller, and the like are driven via the respective driving devices. The drive device drives the electric motor and the actuator while performing speed control, position control, and the like.

Each electric motor and actuator consumes electric power according to their operating conditions. The value of its power consumption can change with time. In each electric motor and actuator, the driving power can be grasped by the driving device that drives them. The data related to these power consumptions are collected by the controller.

The rolling line 10 includes a plurality of steps. Each process (hereinafter, also referred to as a zone) includes one or more electric motors and actuators. In this example, the rolling line 10 includes zones A to F. For example, the A zone includes a temperature control device for the heating furnace 12. For example, the C zone includes two rough rolling mills 14, each of which is driven by a plurality of electric motors. For example, the E zone includes a finishing rolling mill 16, and each finishing rolling mill 16 is driven by a plurality of electric motors. The name of each zone is an example and can be set arbitrarily.

FIG. 2 is a block diagram illustrating an energy management system according to the present embodiment.
As shown in FIG. 2, the energy management system 50 includes an energy management device 53 and a control device 58. The energy management device 53 and the control device 58 are connected to each other via the control network 60.

The high-level computer 51 holds a plan such as what kind of product, what quantity, and by when in the rolling plant. The details of the production plan are determined by the user. The host computer 51 is, for example, a data server or the like. The host computer 51 is connected to the energy management device 53 via the communication network 59, the gateway device 52, and the control network 60. The gateway device 52 is used to connect the general-purpose communication network 59 to the high-speed control network 60.

The energy management device 53 receives data related to the production plan from the host computer 51. The energy management device 53 holds tracking data of rolled materials and products. A part of the retained data is transmitted to the control device 58 via the control network 60.

Tracking data is data about the product. For example, tracking data includes rolled material coil numbers, rolled material information (material, width, length and thickness, etc.), and rolling pitch data. These information and data are associated with the coil number and are held by the energy management device 53 as a database.

The energy management device 53 collects data on the power consumption of the drive device 55, the high-voltage board 56, the MCC board 57, and the like in the rolling plant via the remote input / output device 54. The energy management device 53 calculates the power consumption for each process in chronological order based on the collected data. The power consumption data calculated in time series is associated with the coil number, and the energy management device 53 aggregates the power consumption data for each process together with the attribute data such as the length and thickness of the product, for example. To do.

The energy management device 53 is, for example, a computer terminal. Each is provided with a device for input / output, and can output desired data or information to an output device in a desired format according to the data or information input by the input device. The output device is, for example, a display device, and can process and display desired data in a desired format.

The control device 58 transmits a control signal including data such as operation, stop, and operation speed to the drive device 55, the high pressure board 56, the MCC board 57, and the like via the control network 60 and the remote input / output device 54. The control device 58 receives a control signal including data indicating an operating state and the like from the drive device 55, the high voltage board 56, and the MCC board 57 via the control network 60 and the remote input / output device 54. The control device 58 controls the operation of the rolling plant by setting data to be transmitted to the drive device 55 or the like based on the received control signals, pre-coded program data, or the like.

The control device 58 is, for example, a programmable logic controller (PLC). The program described above is stored in a storage device (not shown) provided in the control device 58 or interconnected with the control device 58. The program is, for example, a ladder program.

In this example, the control device 58 is connected to the drive device 55 via the hard wire 61. The drive device 55 is, for example, an inverter device that drives an AC motor of a rolling plant. The drive device 55 outputs AC power of a desired frequency in order to operate the AC motor at a desired speed. The AC motor is driven at a speed according to a control signal including a speed command value supplied to the drive device 55. The drive device 55 has data on the speed and torque of the AC motor to be driven, and the energy management device 53 collects these data via the remote input / output device 54 and the control device 58.

In this example, the control device 58 is connected to the high voltage board 56 via the hard wire 61. The high pressure plate 56 is a drive device for driving a high pressure pump. The high-pressure pump is driven when a fluid such as water that removes scale formed on the surface of the rolled material is ejected. The high-pressure board 56 has data on the speed and torque of the high-pressure pump to be driven, and the energy management device 53 collects these data via the remote input / output device 54 and the control device 58.

In this example, the control device 58 is connected to the MCC board 57 via the hard wire 61. The MCC board 57 drives actuators such as motors of rolling plants and small-capacity pumps. The energy management device 53 collects data on the power consumption of the actuator driven by the MCC board 57 via the remote input / output device 54 and the control device 58.

The rolling plant is also provided with other actuators, temperature control devices such as a heating furnace, and the like, and data on the power consumption of these is also collected as needed.

The operation of the energy management system 50 of this embodiment will be described.
FIG. 3A is a schematic diagram showing a data structure for explaining the operation of the energy management system of the present embodiment. FIG. 3B is a calculation flowchart for explaining the operation of the energy management system 50 of the present embodiment.
In the energy management system 50 of the present embodiment, the data related to the power consumption associated with each coil number of the tracking data collected in time series is used. Specifically, in this example, as shown in FIG. 3A, the speed data group 101 and the torque data group 102 are collected in time series for the electric motor. For example, velocity data and torque data are stored in the database of the energy management device 53 for each time (Date 1 to Date n) set in a fixed cycle.

The "speed data" represented by "SpeedPointData x" is the data of the rotation speed of a specific electric motor. The specific electric motor is, for example, an electric motor that drives one rolling mill in the rough rolling process. The "torque data" represented by "TorquePointData x" is the torque data output by a specific electric motor. For the motor, "speed data" is multiplied by "torque data", and a coefficient of 0.9 and a coefficient of 1/3600 are further multiplied. 0.9 of the coefficient data 103 is the power factor of the electric motor in this example. 1/3600 of the coefficient data 104 is a constant related to the time for converting the calculation result (electric energy, unit [Wh]) into electric power. The coefficient data 103 and 104 are set for each electric motor and are input in advance in the database of the energy management device 53.

In the calculation result group 105, the calculation results for each time of the speed data group 101 and the torque data group 102 are stored in the database of the energy management device 53.

As shown in FIG. 3B, the energy management system 50 of the present embodiment has a calculation flow including a plurality of steps. In step S01, the energy management device 53 adds the data (Result1 to Result n) of the calculation result group 105 stored in the database over the collected time series (Date1 to Date n). The added data is the power consumption for Motor1. Similarly, the power consumption of other motors (Motor2 to Motor n) is calculated.

Here, in the energy management system 50 of the present embodiment, the steps of the rolling line include several steps. As described above, some steps are A zone, B zone, ..., F zone. The data on power consumption is also associated with which process ("Zone x") each electric motor, actuator, etc. belongs to. That is, these data are also associated with each coil number (data group 106 in FIG. 3A).

In this example, "Zone 1" to "Zone n" correspond to each process. For example, "Zone 1" corresponds to a rough rolling process (C zone), and corresponds to a plurality of electric motors (Motor 1 to Motor n) for driving the mills of the plurality of rough rolling mills 14 shown in FIG.

In step S02, the energy management device 53 adds the energy data of the electric motors in the same zone. The energy management device 53 can calculate and output the energy consumption in the process by adding the data related to the power consumption in the same process.

In step S03, the energy management device 53 adds the energies of all the zones. The energy management device 53 can calculate the power consumption of the product having the coil number by adding all the power consumption data of each process.

4 and 5 are schematic views of an example of an output screen of the energy management system of the embodiment.
As shown in FIG. 4, the display data 200 includes a data display area 201 and a display data setting area 202. In the data display area 201, integrated data of power consumption in each process is displayed for each coil number. In this example, the A zone to the F zone are color-coded for each coil number. As the output device of the energy management device 53, in addition to the display on such a display, a hard copy can be output by a printer or the like.

The display data setting area 202 includes a plurality of pull-down menus and data input fields. In these pull-down menus and data entry fields, data extraction conditions can be set using the steel type, length and thickness associated with the coil number as keys. Further, since the manufacturing date is associated with the coil number, the data extraction condition can be set by using the manufacturing date as a key.

For example, the range of manufacturing dates can be set by the target date setting menu 211. The coil ID input field 212 can output data on the power consumption of the product having the specified coil number. With the steel grade pull-down menu 213, it is possible to extract only the data of the desired steel type and output the data of the power consumption of the product.

For example, from the display output as shown in FIG. 4, it can be seen that the C zone (rough rolling process) and the E zone (finishing rolling process) occupy most of the energy consumption for each coil number. Above all, it is found that the energy consumed in the finish rolling process is dominant, and that reducing the energy consumption in the finish rolling process greatly contributes to the reduction in energy consumption in the entire process.

As shown in FIG. 5, the energy management device 53 can also output more detailed power consumption data of the data displayed on the display as described above. In this example, for example, a link is provided to the coil number (coil ID) displayed on the data display area 201 of FIG. 4, and detailed data as shown in FIG. 5 is displayed by clicking this link. In this output data, the details of the power consumption of each process are displayed as a bar graph for each process. The user can consider and plan energy consumption reduction measures based on the data visualized by such a graph. The display data is not limited to such a bar graph, and may be a pie chart, a line graph, or any other setting. The display graph may be set by a pull-down menu or the like.

The effect of the energy management system of this embodiment will be described.
In the energy management system 50 of the present embodiment, the energy management device 53 is connected to the control device 58 via the control network 60. The energy management device 53 holds tracking data for steel products, and these tracking data are associated with each other by a coil number. Then, the energy management device 53 collects data related to the power consumption of the electric motor or the like associated with the coil number in chronological order. Since the data related to the electric motor or the like is associated with each process, the data related to the power consumption associated with the coil number is held as time-series data of the electric motor or the like for each process. Therefore, the energy management device 53 can aggregate and output data related to power consumption for each process.

Since tracking data such as steel type, steel plate length and steel plate thickness are associated with the coil number, the power consumption data is searched and extracted using these tracking data as a key, and output in various graphs. be able to. Therefore, it becomes possible to visualize the characteristics of the power consumption according to the steel type, the length of the steel plate, and the thickness of the steel plate in the rolling plant, and it is possible to contribute to the improvement of the energy efficiency of the plant.

According to the embodiment described above, it is possible to realize an energy management system and an energy management method that aggregate and output the energy consumption for each zone in one rolling line for each product identification data.

Although some embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention and its equivalents described in the claims. In addition, the above-described embodiments can be implemented in combination with each other.

10 rolling line, 12 heating furnace, 14 rough rolling mill, 16 finishing rolling mill, 18 winding machine, 20 scale removal device, 50 energy management system, 51 high-level computer, 52 gateway device, 53 energy management device, 54 remote input / output Equipment, 55 drive equipment, 56 high pressure board, 57 MCC board, 58 control device, 60 control network

Claims (4)

An energy management device that holds a database containing identification data that identifies products manufactured based on a production plan in a rolling plant and data associated with the identification data.
A control device that outputs control signals related to operation based on the production plan to a drive device provided in the rolling plant.
With
One or more of the driving devices are provided in a plurality of steps of the rolling plant.
The energy management device collects data on power consumption for each drive device based on the control signal in time series from the control device, and holds the data in association with each identification data, and the power consumption of each of the identification data. The power consumption is calculated based on the data related to the power consumption, and the power consumption is added over the period in which the data related to the power consumption is collected to calculate the energy for each of the plurality of steps. Output each of the identification data so that the calculation results for each process can be distinguished and visually recognized.
When the drive device drives an electric motor, the power consumption data is an energy management system including data on the rotation speed of the electric motor and data on the torque of the electric motor. At least one of the plurality of steps includes the plurality of the driving devices.
The energy management system according to claim 1, wherein the energy management device collects time-series data relating to the power consumption of each of the plurality of drive devices. The database contains attribute data of steel grade, length and thickness for each data identifying the product.
The energy management system according to claim 1 or 2, wherein the energy management device extracts the attribute data and data for identifying the product that matches the range of the attribute data. The energy management device maintains a database containing identification data that identifies products manufactured based on the production plan in the rolling plant and data associated with the identification data.
The control device outputs control signals related to operation to the drive device provided in the rolling plant based on the production plan.
One or more of the driving devices are provided in a plurality of steps of the rolling plant.
The energy management device collects data on power consumption for each drive device in time series from the control device based on the control signal, and holds the data for identifying the product in association with each other to identify the product. With respect to the data, the power consumption is calculated based on the data related to the power consumption, and the calculated power consumption is added over the period in which the data related to the power consumption is collected to obtain energy for each of the plurality of steps. The calculation is performed, and the calculation results for each of the plurality of steps are output for each of the identification data so that they can be visually recognized separately.
When the drive device drives an electric motor, the power consumption data is an energy management method including data on the rotation speed of the electric motor and data on the torque of the electric motor.

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