ENERGY OPERATION SUPPORT DEVICE, ENERGY OPERATION SUPPORT SYSTEM, ENERGY OPERATION DEVICE, DISPLAY TERMINAL DEVICE, ENERGY OPERATION SUPPORT METHOD, AND STEEL MILL OPERATING METHOD

Abstract

The energy operations support device is an energy operations support device in a steelworks, and includes an optimization unit that optimizes the operation of energy utilities in equipment within the steelworks, and an upper limit relaxation unit that sets an operational upper limit, which is an upper limit on operation, relative to an equipment upper limit, which is an upper limit on the output of the equipment capacity of the equipment.The upper limit relaxation unit sets an operational upper limit at a target time or target calculation period by determining a predetermined ratio to the equipment upper limit, and the objective functions of the optimization calculation in the optimization unit include the total energy operations cost of the steelworks and an adjustment variable for energy utilities whose upper limit is the difference between the equipment upper limit and the operational upper limit.

Description

[Technical field]

[0001] The present invention relates to an energy management support device, an energy management support system, an energy management device, a display terminal device, an energy management support method, and a method for operating a steelworks. [Background technology]

[0002] Generally, a steelworks is made up of numerous factories and power generation facilities from the upstream process (blast furnace, coke oven, steel making process, etc.) to the downstream process (rolling process, surface treatment process, etc.), and operates using the following energy (gas, steam, electricity). In other words, by-product gases such as B gas (Blast Furnace gas) generated in the blast furnace, C gas (Coke Oven gas) generated in the coke oven, and LD gas (LD converter gas) generated in the converter are used in the factories and power generation facilities. In addition, M gas (Mixed gas), which is a mixture of these by-product gases and has an adjusted calorific value, is also used in the factories and power generation facilities.

[0003] Here, if the gas supply volume falls short of factory demand (for example, the demand for the heating furnaces of a rolling mill), city gas is used to make up for the shortage and satisfy the factory demand. Also, if the gas supply volume to the power generation facility falls short of the specified volume, heavy oil is used to make up for the shortage. These supplementary fuels incur costs according to the amount used. On the other hand, if the gas supply volume is in excess of factory demand, the gas is made harmless by combustion and then released into the atmosphere, but this should be minimized as it leads to energy loss and carbon dioxide emissions. In order to reduce costs and prevent release, it is necessary to utilize gas holders, which are storage facilities for by-product gases, and to appropriately adjust the gas distribution volume.

[0004] For example, in a gas holder, when the supply of by-product gas is greater than the demand, the gas holder takes priority over diffusion and stores the by-product gas, thereby increasing the storage amount (gas holder level) and suppressing diffusion. On the other hand, when the demand for by-product gas is greater than the supply, the gas holder releases the stored gas to meet the demand and reduce the use of supplemental fuel. When the demand for by-product gas is even greater than the supply, the output of the power generation equipment is reduced. If this is still not sufficient, the plant's operating level may be reduced.

[0005] Steam is supplied by heat recovery boilers from LD gas and sintering furnaces, steam accumulators that store steam, boilers for CDQ (Coke Drying Quenching) and extraction from the middle stage of the turbine in the power generation facility. Note that extraction is the process of obtaining steam from the middle stage of the turbine. When extraction is performed, the amount of electricity generated by the power generation facility decreases. Steam is also used in the factory (for insulation of the pickling tank in the cold rolling factory and for vacuum degassing facilities). Any shortage in steam demand is purchased from outside. The power demand of the factory is met by the amount of electricity generated by CDQ, TRT (Top-pressure Recovery Turbine) and power generation facility, as well as electricity purchased from the power company.

[0006] The amount of electricity purchased must be managed so as not to exceed the hourly contracted amount (maximum amount of electricity purchased). In addition, the unit price of electricity purchased varies depending on the time of day, so when the unit price is high and there is a surplus of by-product gas supply, the operating conditions that minimize costs vary depending on the time of day and the supply and demand situation, such as setting the output of the power generation equipment high to reduce the amount of electricity purchased. Against this background, technology to optimize the energy operating costs of steelworks has been proposed.

[0007] For example, Patent Document 1 proposes a method for solving a mixed integer programming problem in which the plant's operating conditions and operating rules are described as constraints by setting upper and lower limits on decision variables in order to find the optimal energy operation conditions of a steelworks. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent No. 7028272 Summary of the Invention [Problem to be solved by the invention]

[0009] However, as equipment ages, it becomes difficult to output at the upper limit of the equipment capacity, so continuing to use the equipment without considering the operational upper limit (hereinafter referred to as the "operational upper limit") that is lower than the equipment upper limit may accelerate the deterioration of the equipment. In addition, when starting up or shutting down equipment due to a shutdown, it is necessary to consider the same issues while taking into account the responsiveness of the equipment shutdown.

[0010] On the other hand, if the equipment is operated at a lower operational limit than the equipment limit, the equipment deterioration can be prevented, but the operational costs will increase. Therefore, it is necessary to minimize the operational costs while considering relaxing the operational limit.

[0011] The present invention has been made in consideration of the above, and aims to provide an energy operation support device, an energy operation support system, an energy operation device, a display terminal device, an energy operation support method, and a steelworks operation method that can achieve both prevention of equipment deterioration and optimization of operation costs by setting an operation upper limit for equipment upper limits, evaluating operation costs, and relaxing the operation upper limit. [Means for solving the problem]

[0012] In order to solve the above-mentioned problems and achieve the objective, the energy operations support device of the present invention is an energy operations support device in a steelworks, and includes an optimization unit that optimizes the operation of energy utilities in equipment within the steelworks, and an upper limit relaxation unit that sets an operational upper limit, which is an operational upper limit, relative to an equipment upper limit, which is the upper limit on the output of the equipment capacity of the equipment, wherein the upper limit relaxation unit sets the operational upper limit at a target time or target calculation period by determining a predetermined ratio to the equipment upper limit, and the objective functions of the optimization calculation in the optimization unit include the total energy operations cost of the steelworks and an adjustment variable for energy utilities whose upper limit is the difference between the equipment upper limit and the operational upper limit.

[0013] In the energy operation support device according to the present invention, in the above invention, the optimization unit performs the optimization calculation under a constraint that the output of the equipment is equal to or less than the sum of the operational upper limit and the adjustment variable.

[0014] In addition, in the energy operation support device of the present invention, in the above invention, the objective functions of the optimization calculation in the optimization unit include the total energy operation cost and the cost related to the adjustment variable, and the cost related to the adjustment variable is calculated based on the unit price of the energy utility and a predetermined weighting coefficient.

[0015] In the energy operation support device according to the present invention, in the above invention, the energy utility is an amount of power generated by a power generation facility, and the unit price of the energy utility is a cost related to a power purchase unit price.

[0016] In addition, in the above invention, the energy operation support device of the present invention includes a response characteristics calculation unit that calculates an equipment upper limit taking into account the response characteristics of the energy utility during a transition period from shutdown to operation or from operation to shutdown based on an operation shutdown plan of the equipment, and the upper limit mitigation unit sets the operation upper limit using the equipment upper limit taking into account the response characteristics.

[0017] In the energy operation support device according to the present invention, in the above invention, the energy utilities include an amount of power generated by a power generation facility, an amount of by-product gas generated, and an amount of steam generated.

[0018] In addition, in the above-mentioned invention, the energy operation support device according to the present invention further includes an output unit that outputs information calculated by the optimization unit, including operation conditions of energy utilities in the facility.

[0019] In order to solve the above-mentioned problems and achieve the objective, the energy operations support system of the present invention is an energy operations support system in a steelworks comprising an energy operations support device and a display terminal device, and comprises an optimization unit that optimizes the operation of energy utilities in equipment in the steelworks, an upper limit relaxation unit that sets an operational upper limit, which is an operational upper limit, relative to an equipment upper limit, which is the output upper limit of the equipment capacity of the equipment, an output unit that outputs information calculated by the optimization unit including the operational conditions of energy utilities in the equipment, an information acquisition unit that acquires information including the operational conditions of the optimized energy utilities in the equipment, and an information display unit that displays the information acquired by the information acquisition unit, wherein the upper limit relaxation unit sets the operational upper limit at a target time or target calculation period by determining a predetermined ratio relative to the equipment upper limit, and the objective functions of the optimization calculation in the optimization unit include the total energy operations cost of the steelworks and an adjustment variable of energy utilities with an upper limit equal to the difference between the equipment upper limit and the operational upper limit.

[0020] In the energy operation support system according to the present invention, in the above invention, the optimization unit performs the optimization calculation under a constraint that the output of the equipment is equal to or less than the sum of the operational upper limit and the adjustment variable.

[0021] In addition, in the energy management support system of the present invention, in the above invention, the objective functions of the optimization calculation in the optimization unit include the total energy management cost and the cost related to the adjustment variable, and the cost related to the adjustment variable is calculated based on the unit price of the energy utility and a predetermined weighting coefficient.

[0022] In the energy management support system according to the present invention, in the above invention, the energy utility is the amount of power generated by a power generation facility, and the unit price of the energy utility is a cost related to the unit price of power purchase.

[0023] In addition, in the above invention, the energy operation support system of the present invention includes a response characteristics calculation unit that calculates an equipment upper limit taking into account the response characteristics of the energy utility during a transition period from shutdown to operation or from operation to shutdown based on an operation shutdown plan of the equipment, and the upper limit mitigation unit sets the operation upper limit using the equipment upper limit taking into account the response characteristics.

[0024] In addition, the energy operation support system of the present invention, in the above invention, includes a tuning screen display unit that sets and displays the specified ratio of the operational upper limit to the equipment upper limit and a weighting coefficient of the cost related to the adjustment variable.

[0025] In order to solve the above-mentioned problems and achieve the objectives, an energy management device of the present invention controls equipment within a steelworks in accordance with the operating conditions of energy utilities output from the output section of the above-mentioned energy management support device.

[0026] In order to solve the above-mentioned problems and achieve the objectives, the energy management device of the present invention controls equipment within a steelworks in accordance with the operating conditions of energy utilities output from the output section of the above-mentioned energy management support system.

[0027] In order to solve the above-mentioned problems and achieve the objectives, the display terminal device of the present invention is a display terminal device that constitutes an energy operation support system in a steelworks, and is equipped with an information acquisition unit that acquires information including operating conditions of optimized energy utilities in equipment within the steelworks, and an information display unit that displays the information, wherein the information includes operating conditions of optimized energy utilities in the equipment calculated by an optimization calculation that minimizes an objective function including costs related to adjustment variables of energy utilities that relax the operating upper limit set for the equipment upper limit on the output of the energy equipment of the steelworks, and the total energy operation cost of the steelworks.

[0028] In addition, in the above invention, the display terminal device of the present invention is provided with a tuning screen display unit that sets and displays a predetermined ratio of the operational upper limit to the equipment upper limit used in the optimization calculation and a weighting coefficient of the cost related to the adjustment variable relative to the total energy operation cost of the steelworks, and the information display unit displays the information calculated by an optimization calculation using the predetermined ratio and the weighting coefficient that are set and displayed on the tuning screen display unit.

[0029] In order to solve the above-mentioned problems and achieve the objective, the energy operations support method of the present invention includes an optimization step in which an energy operations support device in a steelworks optimizes the operation of energy utilities in equipment within the steelworks, and an operational upper limit setting step in which an operational upper limit is set relative to an equipment upper limit, which is the upper limit on the output of the equipment capacity of the equipment, wherein the operational upper limit setting step sets the operational upper limit at a target time or target calculation period by determining a predetermined ratio to the equipment upper limit, and the optimization calculation in the optimization step includes, as objective functions, the total energy operations cost of the steelworks and an adjustment variable for energy utilities with an upper limit equal to the difference between the equipment upper limit and the operational upper limit.

[0030] In addition, the energy operations support method of the present invention, in the above invention, includes a response characteristics calculation step in which the energy operations support device calculates an equipment upper limit taking into account the response characteristics of the energy utility during a transition period from shutdown to operation or from operation to shutdown based on an operation shutdown plan of the equipment, and the operation upper limit setting step sets the operation upper limit using the equipment upper limit taking into account the response characteristics.

[0031] In order to solve the above-mentioned problems and achieve the objectives, a method for operating a steelworks of the present invention includes a step of operating a steelworks in accordance with decision variables calculated by optimization calculations of the above-mentioned energy operation support method. Effect of the Invention

[0032] The energy management support device, energy management support system, energy management device, display terminal device, energy management support method, and steelworks operation method of the present invention make it possible to prevent equipment deterioration while optimizing operating costs by determining an upper operating limit for equipment upper limits, evaluating operating costs, and relaxing the upper operating limit. [Brief description of the drawings]

[0033] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of an energy management support system according to an embodiment of the present invention. [Diagram 2] (a) of Figure 2 is a diagram showing a schematic configuration of an information processing device realizing an energy management support device according to an embodiment of the present invention, and (b) of Figure 2 is a diagram showing a schematic configuration of a display terminal device according to an embodiment of the present invention. [Diagram 3] FIG. 3 is a flowchart showing the flow of the energy management support method executed by the energy management support device according to the embodiment of the present invention. [Figure 4]FIG. 4 is a diagram showing an example of response characteristics when the response transition process during the transition period from equipment shutdown to operation is expressed as a straight line and an exponential function (first-order lag) in the response characteristic calculation step of the energy management support method according to an embodiment of the present invention. [Diagram 5] FIG. 5 is a diagram showing an example of an equipment upper limit when the response transition process during the transition period from equipment shutdown to operation is expressed as a straight line and an exponential function (first-order lag) in the response characteristics calculation step of the energy management support method according to an embodiment of the present invention. [Figure 6] FIG. 6 is an embodiment of the present invention, showing the standardized output (the value obtained by dividing the power generation output by the equipment upper limit and multiplying the result by 100) when optimization calculation is performed with a predetermined ratio of the equipment upper limit of a certain power generation facility set to 0.5 and a weight of the adjustment variable set to 0.01. [Figure 7] FIG. 7 is an embodiment of the present invention, showing a cost ratio (operating cost with mitigation ÷ operating cost without mitigation) calculated with a predetermined ratio to the equipment upper limit of a certain power generation facility in 0.1 intervals from 0.1 to 1.0 and a weight of the adjustment variable set to 0.01. [Figure 8] FIG. 8 is an embodiment of the present invention, and shows the standardized output (the value obtained by dividing the power generation output by the equipment upper limit and multiplying the result by 100) obtained by optimization calculation with a predetermined ratio of a power generation facility to the equipment upper limit of 0.5 and a weight of the adjustment variable of 0.01, taking into account the response characteristics during the transition period from the shutdown of the facility to operation. [Figure 9] FIG. 9 is an embodiment of the present invention, and is a diagram showing a cost ratio (operating cost with mitigation ÷ operating cost without mitigation) calculated by taking into account the response characteristics during the transition period from the shutdown of the equipment to operation, setting a predetermined ratio to the equipment upper limit of a certain power generation equipment in 0.1 intervals from 0.1 to 1.0, and setting the weight of the adjustment variable to 0.01. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0034] An energy management support device, an energy management support system, an energy management device, a display terminal device, an energy management support method, and an operating method for a steelworks according to embodiments of the present invention will be described with reference to the drawings. Note that the components in the following embodiments include those that are easily replaceable by a person skilled in the art, or those that are substantially the same.

[0035] (Energy Operation Support System) An energy operations support system including an energy operations support device according to an embodiment will be described with reference to Fig. 1. The energy operations support system is a system used in, for example, a steelworks, and calculates optimal energy operation conditions (conditions related to the operation of energy utilities) in the steelworks. As shown in the figure, the energy operations support system 1 has an information processing device 10, an operation plan and performance database 20, and a display terminal device 30. The energy utilities include, for example, gas, steam, and electricity.

[0036] The information processing device 10, the operation plan and performance database 20, and the display terminal device 30 are configured to be capable of communicating with each other via a network N such as the Internet. In the energy management support system, the display terminal device 30 is disposed, for example, in a steelworks.

[0037] (Energy operation support device) An information processing device 10 that realizes an energy operation support device according to an embodiment will be described with reference to (a) of Fig. 2. The information processing device 10 is realized by, for example, a general-purpose computer such as a workstation or a personal computer, or a server located on a cloud. The information processing device 10 may be composed of multiple computers connected via a network. The information processing device 10 may also include information input means such as a keyboard, a mouse pointer, or a numeric keypad.

[0038] The information processing device 10 includes a processor (arithmetic processing device) including a CPU (Central Processing Unit) and a memory (main storage unit) including a RAM (Random Access Memory) and a ROM (Read Only Memory). The processor executes a computer program to control each component, thereby realizing a function that meets a predetermined purpose. The information processing device 10 functions as a response characteristic calculation unit 11, an upper limit relaxation unit 12, and an optimization unit 13 through the execution of the computer program.

[0039] The information processing device 10 may also include a storage unit that stores various processing results, etc. The storage unit is configured from a recording medium such as an EPROM (Erasable Programmable ROM), a hard disk drive (HDD), a solid state drive (SSD), and a removable medium. Examples of the removable medium include a disk recording medium such as a Universal Serial Bus (USB) memory, a Compact Disc (CD), a Digital Versatile Disc (DVD), and a Blu-ray (registered trademark) Disc (BD).

[0040] The response characteristic calculation unit 11 calculates an equipment upper limit taking into consideration the response characteristics of the energy utility during a transition period from shutdown to operation, or during a transition period from operation to shutdown, based on an energy equipment operation shutdown plan. Note that specific processing contents in the response characteristic calculation unit 11 will be described later (see Figs. 3 to 5 described later). Also, the processing in the response characteristic calculation unit 11 may be performed immediately before the processing in the upper limit relaxation unit 12 and the optimization unit 13, or may be performed in advance at a timing different from the processing in the upper limit relaxation unit 12 and the optimization unit 13.

[0041] The upper limit alleviation unit 12 sets an operational upper limit, which is an operational upper limit, relative to an equipment upper limit, which is an upper limit on the output of the equipment capacity of the energy equipment. The upper limit alleviation unit 12 sets an operational upper limit at a target time or a target calculation period by determining a predetermined ratio with respect to the equipment upper limit. Furthermore, the upper limit alleviation unit 12 may set the operational upper limit using an equipment upper limit that takes into account the response characteristics calculated by the response characteristic calculation unit 11, or may set the operational upper limit without using an equipment upper limit that takes into account the response characteristics. Note that the specific processing contents of the upper limit alleviation unit 12 will be described later (see FIG. 3 described later).

[0042] The optimization unit 13 optimizes the operation of energy utilities in the energy facilities in the steelworks. The optimization unit 13 obtains information on energy utilities for each plant constituting the steelworks and information on the operation plan of the energy facilities in the steelworks from the operation plan / performance database 20, and performs optimization calculations.

[0043] Here, "information about energy utilities" includes actual and predicted values ​​of the amount of energy utility generation, actual and predicted values ​​of the amount of energy utility consumption, etc. Furthermore, "energy utilities" include, for example, electricity (amount of power generated by power generation facilities), gas (amount of by-product gas generated), and steam (amount of steam generated). Furthermore, "information about operation plans for energy facilities" includes, for example, settings for energy facilities, contract values ​​of trading contracts, etc. Furthermore, "energy facilities" include, for example, mixed gas production facilities, gas holders, steam accumulators, blast furnace top pressure power generation facilities, and power generation facilities that use by-product gas, heavy oil, or extracted steam, etc. Furthermore, "trading contracts" include, for example, purchase contracts for the use of heavy oil, city gas, and steam, and purchase contracts for purchasing electricity, etc.

[0044] The objective function of the optimization calculation in the optimization unit 13 is the total energy operation cost of the steelworks (total_cost(k)) and the adjustment variable of the energy utility (dSUB POW jIn addition, the above-mentioned objective variables include the total energy operation cost (total_cost(k)) of the steelworks and the cost related to the adjustment variables of the energy utilities (wP ELE (k)dSUB POW j (k)) are included.

[0045] Here, the "total energy operating cost" includes, for example, the costs associated with the use of heavy oil, city gas, and steam, and the costs associated with purchasing electricity. The "adjustment variable" is a variable for adjusting output to relax the operating upper limit, and is a variable for adjusting the degree to which the operating upper limit is changed. This adjustment variable has a lower limit of 0 and an upper limit of the difference between the equipment upper limit and the operating upper limit (see formula (15) below). The "cost related to the adjustment variable" is a cost calculated based on the unit price of energy utilities and a predetermined weighting coefficient (see formula (17) below). The "unit price of energy utilities" includes, for example, the cost related to the unit price of electricity purchase, the cost related to the unit price of steam purchase, the cost related to the unit price of heavy oil purchase, the cost related to the unit price of city gas purchase, etc.

[0046] The optimization unit 13 transmits information such as the results of optimization calculations to other terminal devices or other information processing devices via the network N. Note that the specific processing content in the optimization unit 13 will be described later (see FIG. 3 described later).

[0047] The information processing device 10 may include an output unit 14 that transmits various information to other terminal devices or other information processing devices via the network N. The output unit 14 outputs information calculated by the optimization unit 13, including, for example, the operation conditions of energy utilities in the equipment in the steelworks. Specifically, the information transmitted by the output unit 14 includes the conditions for operation of energy utilities in the equipment in the steelworks (energy operation conditions) that are included in the decision variables (see Tables 4 and 5) calculated by the optimization unit 13 through optimization calculations.

[0048] Further, the other information processing devices to which the output unit 14 transmits various information may include, for example, a control computer for each energy facility. This control computer may control each energy facility according to the transmitted operating conditions of the energy facility. Furthermore, the control computer may control each energy facility by accepting modifications by an operation operator. Here, examples of the control of the energy facility include increasing the output of the power generation facility to reduce the amount of electricity purchased during a time period when the electricity purchase price is high, and discharging the gas stored in the gas holder to increase the output of the power generation facility.

[0049] Furthermore, the output unit 14 may display the various pieces of information through a display device (e.g., a liquid crystal display (LCD), an organic light emitting display (OLED), a touch panel display, etc.) not shown connected to the information processing device 10. The output unit 14 may also display a tuning screen or the like for various calculations in the optimization unit 13. The output unit 14 may also be configured with a display device and display the various pieces of information, the tuning screen, etc.

[0050] The tuning screen may display, for example, a predetermined ratio Ratio (see formulas (14) and (15) described later) to the upper operational limit of the energy equipment included in the constraint conditions in the optimization calculation of the optimization unit 13. The tuning screen may also display, for example, a weighting coefficient w (see formula (17) described later) determined in advance for the "cost related to the adjustment variable."

[0051] (Operation plan and performance database) The operation plan and performance database 20 is stored in a storage device constituted by a recording medium such as an EPROM (Erasable Programmable ROM), a hard disk drive (HDD), or a removable medium.

[0052] The operation plan / performance database 20 stores information on the steelworks' operation plan (hereinafter referred to as "operation plan information") and information on the operation performance (hereinafter referred to as "operation performance information"). The operation plan information and operation performance information are accumulated, for example, by an operation planning device and an operation performance device (not shown), and then aggregated by an aggregation device (not shown) and stored in the operation plan / performance database 20. The operation plan / performance database 20 may also be configured by a database server provided on the network N.

[0053] (Display terminal device) The display terminal device 30 is for acquiring and displaying various information from the information processing device 10. The display terminal device 30 is realized, for example, by a personal computer connected to the information processing device 10 via a network N. In addition, the display terminal device 30 has, for example, a function of an information acquisition unit 31 and a function of an information display unit 32, as shown in (b) of FIG.

[0054] The information acquisition unit 31 acquires information such as the result of optimization calculation from, for example, the information processing device 10, and displays it through a display device (information display unit) (not shown) connected to the display terminal device 30. In addition, the display terminal device 30 may be configured by a display device, and may display information such as the result of optimization calculation acquired from the information processing device 10 via the network N.

[0055] The information acquisition unit 31 acquires information including the optimized operating conditions of energy utilities in the facilities in the steelworks from the information processing device 10. In addition, the information display unit 32 displays the information acquired by the information acquisition unit 31.

[0056] The information displayed by the information display unit 32 includes, for example, the optimized energy utility operation conditions in the facility calculated by an optimization calculation that minimizes an objective function including the cost related to the adjustment variable of the energy utility that relaxes the operation upper limit set for the equipment upper limit on the output of the energy equipment of the steelworks, and the total energy operation cost of the steelworks. For example, the information includes the operation upper limit, which is the upper limit on the operation of the equipment, set by a predetermined ratio to the equipment upper limit, which is the upper limit on the output of the equipment capacity of the equipment in the steelworks, and the adjustment variable of the energy utility, which has the difference from the equipment upper limit as the upper limit. The information displayed by the information display unit 32 also includes, for example, the cost related to the adjustment variable calculated based on the total energy operation cost of the steelworks, the unit price of the energy utility, and a predetermined weighting coefficient. The information displayed by the information display unit 32 also includes, for example, the optimized energy utility operation conditions (energy operation conditions) in the facility calculated by an optimization calculation based on a constraint condition that the output of the equipment is equal to or less than the sum of the operation upper limit and the adjustment variable.

[0057] The information display unit 32 displays at least the total energy operation cost, the operation upper limit, and the adjustment variables of the steelworks. The information display unit 32 may also display the total energy operation cost of the steelworks, the operation upper limit of energy utilities, and the adjustment variables, which are included in the information of the result of the optimization calculation.

[0058] The display terminal device 30 may include a tuning screen display unit 33 that displays a tuning screen during optimization calculation. The tuning screen display unit 33 may set and display, for example, a predetermined ratio Ratio (see formulas (14) and (15) described later) to the upper operational limit of the energy facility included in the constraint conditions in the optimization calculation of the optimization unit 13. The tuning screen display unit 33 may also set and display, for example, a weighting coefficient w (see formula (17) described later) determined in advance for the "cost related to the adjustment variable."

[0059] In addition, when the display terminal device 30 is equipped with a tuning screen display unit 33, the information display unit 32 may display information including optimized energy operation conditions for equipment within the steelworks, calculated by optimization calculation using a predetermined ratio Ratio set and displayed on the tuning screen display unit 33 and a weighting coefficient w.

[0060] Note that the configurations shown in Fig. 1, (a) and (b) of Fig. 2 are examples. The information processing device 10 and the display terminal device 30 may not include all of the components shown in (a) and (b) of Fig. 2, respectively. Furthermore, the information processing device 10 and the display terminal device 30 may include components other than the components shown in (a) and (b) of Fig. 2, respectively. Furthermore, the components included in each of the information processing device 10 and the display terminal device 30 are not limited to the examples shown in (a) and (b) of Fig. 2, respectively.

[0061] For example, the optimization unit 13 and the information display unit 32 may be in the same device. Furthermore, for example, some of the components provided in the information processing device 10 in (a) of Fig. 2 may be provided on the display terminal device 30 side. Furthermore, for example, some of the components provided in the display terminal device 30 in (b) of Fig. 2 may be provided on the information processing device 10 side. Thus, an energy management support system including the information processing device 10 and the display terminal device 30 may include, as a whole, the response characteristic calculation unit 11, the upper limit alleviation unit 12, the optimization unit 13, the output unit 14, the information acquisition unit 31, and the information display unit 32.

[0062] (Energy Management Device) The energy management device according to the embodiment controls the steelworks equipment (energy equipment) according to the optimized energy utility operation conditions (energy operation conditions) in the steelworks equipment output from the output unit 14 of the energy operation support system 1 (information processing device 10). The energy management device is realized, for example, by a control computer for each energy equipment. Examples of the control of the energy equipment include increasing the output of the power generation equipment so that the amount of purchased electricity does not exceed the contracted amount per hour (upper limit of electricity purchase amount), and discharging stored gas from a gas holder to increase the output of the power generation equipment.

[0063] (Energy operation support method) An energy management support method executed by the energy management support system according to the embodiment will be described with reference to Fig. 3 to Fig. 5. As shown in the figures, the energy management support method includes a response characteristic calculation step (steps S1 to S3), an upper limit relaxation step (steps S4 to S6), and an optimization step (steps S7 to S9).

[0064] 3 starts when an execution command for the optimization calculation process is input to the information processing device 10, and the optimization calculation process proceeds to step S1. Steps S1 to S3 may be performed immediately before steps S4 to S9, or may be performed in advance at a different timing from steps S4 to S9.

[0065] <Steps S1 to S3> In the process of step S1, the response characteristic calculation unit 11 reads the response characteristic. This response characteristic is an approximation of the response transition process as a straight line or an exponential function (first-order lag) during the transition period from the shutdown to operation of the equipment (energy equipment) or the transition period from operation to shutdown of the equipment. For example, (a) of FIG. 4 shows an example of the response characteristic when the response transition process is approximated as a straight line. Also, (b) of the same figure shows an example of the response characteristic when the response transition process is approximated as an exponential function (first-order lag). In the same figure, the equipment upper limit during operation is illustrated as the "equipment upper limit during normal operation". Meanwhile, during the transition time from shutdown to operation, the line indicated by A in the same figure is the equipment upper limit.

[0066] Next, in the process of step S2, the response characteristic calculation unit 11 calculates the equipment upper limit taking into account the response characteristics. Specifically, when the target time or the target calculation period is a transition period from equipment stop to operation or from operation to stop, the response characteristic calculation unit 11 calculates the equipment upper limit for each time or each calculation period according to the response characteristics. Note that when the target time or the target calculation period is not a transition period, a pre-given value that does not take into account the response characteristics is set as the equipment upper limit.

[0067] Figure 5 shows an example of the equipment upper limit when the response transition process during the transition period (transition time) from equipment shutdown to operation is expressed as a straight line and an exponential function (first-order lag). The slope of the straight line is expressed as "equipment upper limit when equipment is operating ÷ transition period from equipment shutdown to operation." In addition, the exponential function is expressed as "a first-order lag based on a time constant (for example, the time it takes to reach 63% of the equipment upper limit)."

[0068] Next, in the process of step S3, the equipment upper limit (for example, the power generation upper limit UB POW X etc.) are stored in the operation plan and performance database 20. In this way, by storing the equipment upper limits taking into account the response characteristics in advance as a list of set values, the operator can view them.

[0069] <Steps S4 to S6> In the process of step S4, the upper limit alleviation unit 12 reads a predetermined ratio related to the operation upper limit and the adjustment variable upper limit. This "predetermined ratio" is a ratio for calculating the operation upper limit with respect to the equipment upper limit, and is a ratio for determining the operation upper limit for preventing deterioration of the equipment from the equipment upper limit. The specific value of the predetermined ratio is not limited, and a value determined in advance according to the characteristics of each equipment is used.

[0070] Next, in the process of step S5, the upper limit alleviation unit 12 calculates the operation upper limit and the adjustment variable upper limit. The operation upper limit can be calculated by multiplying the equipment upper limit by a predetermined ratio. That is, "operation upper limit = equipment upper limit × predetermined ratio". Also, the adjustment variable upper limit can be calculated by subtracting the operation upper limit from the equipment upper limit. That is, "adjustment variable upper limit = equipment upper limit - operation upper limit = equipment upper limit × (1 - predetermined ratio)".

[0071] Next, in the process of step S6, the operational upper limit and the adjustment variable upper limit calculated in the process of step S5 are stored in the operation plan and performance database 20.

[0072] <Steps S7 to S9> In the process of step S7, the optimization unit 13 performs optimization calculations. First, the optimization unit 13 acquires data on the setting values ​​of the energy equipment in the steelworks as input data for the optimization calculation process. This data on the setting values ​​includes the following, for example, as shown in Table 1. In Table 1, "x" indicates the number of generators.

[0073] Power generation limit (x=1U~NU):UB POW X Power generation lower limit (x=1U~NU):LB POW X Power generation change upper limit (x=1U~NU):UB POWDIF X Power generation change limit (x=1U~NU):LB POWDIF X B Gas Holder Upper Limit (Storage Capacity): UB B LEVEL B Gas Holder Lower Limit (Storage Capacity): LB B LEVEL B Gas holder upper limit (intake amount / discharge amount): UB B INOUT B Gas holder lower limit (intake amount / discharge amount): LB B INOUT C Gas Holder Upper Limit (Storage Capacity): UB C LEVEL C Gas Holder Lower Limit (Storage Capacity): LB C LEVEL C Gas holder upper limit (amount of intake / discharge): UB C INOUT C Gas holder lower limit (intake amount / discharge amount): LB C INOUT LD gas holder upper limit (storage capacity): UB LD LEVEL LD gas holder lower limit (storage capacity): LB LD LEVEL LD gas holder upper limit (amount of intake / discharge): UB LD INOUT LD gas holder lower limit (amount swallowed / discharged): LB LD INOUT Steam accumulator upper limit (storage volume): UB ST LEVEL Steam accumulator lower limit (storage volume): LB ST LEVEL Steam accumulator upper limit (intake amount / discharge amount): UB ST INOUT Steam accumulator lower limit (intake amount / discharge amount): LB ST INOUT Predetermined ratio: Ratio Adjustment variable weight: w

[0074] [Table 1]

[0075] The optimization unit 13 also acquires contract value data necessary for calculating the costs involved in energy operations at the steelworks as input data for the optimization calculation process. This contract value data includes the following, for example, as shown in Table 2. In Table 2, "k=0" indicates the present, and "k=1 to N" indicate the future. "N" is the final period of the optimization calculation, and indicates two hours into the future, for example, when N=24 and one period is in units of 5 minutes.

[0076] Electricity purchase price: P ELE (k) Steam purchase price:P ST (k) Heavy oil purchase price: P OIL (k) City gas purchase price: P TOG (k)

[0077] [Table 2]

[0078] In addition, the optimization unit 13 acquires data on the actual values ​​of energy utilities in the steelworks at the current time (k=0) as input data for the optimization calculation process. This data on the actual values ​​includes the following, as shown in Tables 3 to 5 (see the second column from the left), for example.

[0079] B Gas generation volume (factory total): S B (0) C Gas Generation Amount (Factory Total): S C (0) LD gas generation volume (factory total): S LD (0) Steam generation (factory total): S ST (0) TRT power generation (all units): S TRTELE (0) Power generation capacity of power generation facility (x=1U~NU): S POW X (0) B Gas usage (factory total): D B (0) C Gas consumption (factory total): D C(0) LD gas usage (factory total): D LD (0) M Gas usage (factory total): D M PLANT (0) Steam consumption (factory total): D ST (0) Electricity consumption (factory total): D ELE (0) B Gas usage (x=1U~NU): D B X (0) C Gas usage (x=1U~NU): D C X (0) LD gas usage (x=1U~NU): D LD X (0) M gas usage (x=1U~NU): D M X (0) Heavy oil consumption (x=1U~NU):D OIL X (0) Bleed air amount (x=1U~NU):S ST X (0) City gas consumption (for power generation equipment): D TOG POW (0) City gas consumption (for factories (rolling)): D TOG Mill (0) B Gas holder (storage capacity): H B LEVEL (0) B Gas holder (intake and discharge amount): H B INOUT (0) C Gas Holder (storage capacity): H C LEVEL (0) C Gas holder (amount of intake / discharge): H C INOUT (0) LD gas holder (storage capacity): H LD LEVEL (0) LD gas holder (amount of intake / discharge): H LD INOUT (0) Steam accumulator (storage capacity): H ST LEVEL (0) Steam accumulator (intake and discharge volume): HST INOUT (0) Electricity purchase amount: S ELE Purchase (0) Steam purchase amount: S ST Purchase (0) M gas (B gas) for power generation facilities: D B POW (0) M gas (C gas) for power generation facilities: D C POW (0) M gas for power generation facilities (LD gas): D LD POW (0) M gas for power generation equipment (city gas): D TOG POW (0) Factory gas M (B gas): D B Mill (0) Factory gas M (C gas): D C Mill (0) Factory M gas (LD gas): D LD Mill (0) Factory gas (city gas): D TOG Mill (0) Total energy operating cost:total_cost(0) Adjustment variable: dSUB POW j (0)

[0080] [Table 3] [Table 4] [Table 5]

[0081] In addition, the optimization unit 13 acquires data on predicted values ​​of energy utilities of the factories in the steelworks in the future (k=1 to N) as input data for the optimization calculation process. This predicted value data includes, for example, the following, as shown in Table 3 above (see the third column from the left).

[0082] B Gas generation volume (factory total): S B (k) C Gas Generation Amount (Factory Total): S C (k) LD gas generation volume (factory total): S LD (k) Steam generation (factory total): S ST (k) TRT power generation (all units): S TRTELE (k) Power generation capacity of power generation facility (x=1U~NU): S POW X (k) B Gas usage (factory total): D B (k) C Gas consumption (factory total): D C (k) LD gas usage (factory total): D LD (k) M Gas usage (factory total): D M PLANT (k) Steam consumption (factory total): D ST (k) Electricity consumption (factory total): D ELE (k)

[0083] Next, in the processing of step S7, the data acquired as described above is used to perform an optimization calculation to find the conditions for minimizing the total energy operation cost total_cost(k) for the steelworks' energy operations within a specified future period (k = 1 to N).

[0084] The decision variables (variables to be searched to minimize the cost) in the optimization calculation in step S7 include the following, as shown in Tables 4 and 5 above (see the third column from the left).

[0085] B Gas usage (x=1U~NU): D B X (k) C Gas usage (x=1U~NU): D C X (k) LD gas usage (x=1U~NU): D LD X (k) M gas usage (x=1U~NU): D M X (k) Heavy oil consumption (x=1U~NU):D OILX (k) Bleed air amount (x=1U~NU):S ST X (k) City gas consumption (for power generation): D TOG POW (k) City gas consumption (for factories (rolling)): D TOG Mill (k) B Gas holder (storage capacity): H B LEVEL (k) B Gas holder (intake and discharge amount): H B INOUT (k) C Gas Holder (storage capacity): H C LEVEL (k) C Gas holder (amount of intake / discharge): H C INOUT (k) LD gas holder (storage capacity): H LD LEVEL (k) LD gas holder (amount of intake / discharge): H LD INOUT (k) Steam accumulator (storage capacity): H ST LEVEL (k) Steam accumulator (intake and discharge volume): H ST INOUT (k) Electricity purchase amount: S ELE Purchase (k) Steam purchase amount: S ST Purchase (k) M gas (B gas) for power generation facilities: D B POW (k) M gas (C gas) for power generation facilities: D C POW (k) M gas for power generation facilities (LD gas): D LD POW (k) M gas for power generation equipment (city gas): D TOG POW (k) Factory gas M (B gas): D B Mill (k) Factory gas M (C gas): D C Mill (k) Factory M gas (LD gas): D LD Mill (k) Factory gas (city gas): D TOG Mill (k) Total energy operating cost:total_cost(k) Adjustment variable: dSUB POW j (k)

[0086] In step S7, constraint conditions such as those shown in the following formulas (1) to (15) are set during optimization calculation. Note that "T" in the following formulas (6) and (11) is a time conversion value of one period, and for example, if one period is in units of 5 minutes, then T=5 / 60(h). The subscript "j" in the following formulas (1) to (15) indicates the number of the energy facility (e.g., generator). That is, "f j " is a function that indicates the power generation characteristics of generator j, and outputs the amount of power generation using, for example, the amount of by-product gas generated or the amount of steam generated as input.

[0087] Here, the following formula (1) is a formula that shows the B gas balance. The following formula (2) is a formula that shows the C gas balance. The following formula (3) is a formula that shows the LD gas balance. The following formula (4) is a formula that shows the M gas balance of a factory. The following formula (5) is a formula that shows the M gas balance of a power generation facility. The following formula (6) is a formula that shows a gas holder. The following formula (7) is a formula that shows a power generation model. The following formula (8) is a formula that shows the power balance. The following formula (9) is a formula that shows the steam balance. The following formulas (10) to (15) are formulas that show the upper and lower limit balances.

[0088] In addition, the following formula (14) is specifically a constraint condition that the output of the energy facility is equal to or greater than the lower limit of the energy facility and equal to or less than the sum of the operation upper limit and the adjustment variable. In the following formula (14), the energy facility is a power generation facility, and the power generation amount of the power generation facility (S POW X (k)) is the power generation lower limit (LB POW j ) or more, and the sum of the upper limit of operation and the adjustment variable (RatioUB POW j +dSUB POW j (k)) is shown, but the same applies to the amount of by-product gas generated or the amount of steam generated.

[0089] In addition, the following formula (15) is specifically, POW j In other words, as shown in the following formula (15), the adjustment variable (dSUB POW j (k)) has a lower limit of 0 and an upper limit of "(1-Ratio)UB POW x(k) is a real number.

[0090]

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[0091] The total energy operating cost total_cost(k) to be minimized in step S7 is the sum of the supplementary fuels, heavy oil (OIL), town gas (TOG), steam (ST), and purchased electricity (ELE), as shown in the following formula (16). The unit prices of each are as shown in Table 2 above.

[0092]

number

[0093] Using these, the sum of the total cost from the current time to N cycles ahead and the cost related to the adjustment variable (apparent cost for the adjustment variable) is calculated as shown in formula (17) below. As shown in formula (17) below, an apparent cost occurs for the amount of power generation that exceeds the operational upper limit, and since it is multiplied by the weight w, it becomes cheaper than the cost of purchasing electricity, and when purchasing electricity, the power generation facility generates electricity in excess of the operational upper limit. Note that in formula (17) below, since the adjustment variable corresponds to electricity, the electricity purchase price (P ELE However, if the adjustment variables correspond to steam, heavy oil, and city gas, the purchase price of steam, heavy oil, and city gas may be used.

[0094]

number

[0095] Next, in the process of step S8, the optimization unit 13 displays the result of the optimization calculation on, for example, the display terminal device 30. Next, in the process of step S9, the optimization unit 13 determines whether or not the optimization calculation has been completed, and if so, ends this process, and if not, returns to the process of step S1.

[0096] (Method of operating steel mills) The method for operating a steelworks according to the embodiment includes a step of operating the steelworks according to decision variables (see Tables 4 and 5) calculated by the optimization calculation of the method for supporting energy operation in a steelworks described above. As a result, the method for operating a steelworks according to the embodiment can set an upper limit on operation of equipment related to energy utilities in the steelworks to avoid equipment deterioration, and can minimize the energy operation costs of the steelworks while relaxing the upper limit on operation in accordance with the operation costs.

[0097] In the energy operation support device, energy operation support system, energy operation device, display terminal device, energy operation support method, and steelworks operation method according to the above-described embodiments, an adjustment variable for output with an upper limit equal to the difference obtained by subtracting the operation upper limit from the equipment upper limit is introduced, and the sum of the adjustment variable and the operation upper limit is set as the output upper limit, thereby relaxing the operation upper limit. In addition, the apparent power generation cost (the power purchase price multiplied by a weight) is added to the objective function of the optimization calculation, and since this is set to be cheaper than the power purchase, a mechanism is created in which power is generated in excess of the operation upper limit instead of purchasing power. The same is true when the response characteristics during the transition period from shutdown to operation, or the transition period from operation to shutdown, are considered.

[0098] In this way, in the energy operation support device, energy operation support system, energy operation device, display terminal device, energy operation support method, and steelworks operation method according to the embodiments, in order to relax the operation upper limit of the energy equipment, an adjustment variable is added in addition to the operation upper limit, and the upper limit of the energy utility is set so as to allow up to the equipment upper limit. This makes it possible to minimize operation costs while considering the relaxation of the operation upper limit. In addition, when starting up or shutting down the energy equipment due to the operation stoppage, the equipment upper limit is set to change stepwise taking into account the response characteristics, and in this case as well, the same effect as above is expected.

[0099] In this way, the energy operation support device, energy operation support system, energy operation device, display terminal device, energy operation support method, and steelworks operation method according to the embodiments make it possible to prevent equipment deterioration while optimizing operating costs by determining an upper operating limit for equipment upper limits, evaluating operating costs, and relaxing the upper operating limit.

[0100] (Example) An embodiment of the energy management support method according to the present invention will be described with reference to Fig. 6 to Fig. 9. In this embodiment, one period is set to 5 minutes, optimization calculations are performed up to 24 periods ahead, and the calculation results are displayed on a display terminal device.

[0101] In the first embodiment, the upper limit relaxation step and the optimization step were performed during the time period when the power generation facility was in operation. In the first embodiment, the response characteristics during the transition period from operation to shutdown or from shutdown to operation were not taken into consideration.

[0102] Figure 6 shows the standardized output (the value obtained by dividing the power output by the equipment upper limit and multiplying it by 100) when optimizing the calculation with the specified ratio of a certain power generation facility to the equipment upper limit set to 0.5 and the weight of the adjustment variable set to 0.01. As shown in the figure, it can be seen that the standardized output increases with upper limit relaxation (see solid line) compared to the case without upper limit relaxation (see dashed line).

[0103] Next, Fig. 7 shows the cost ratio (operating cost with relaxation ÷ operating cost without relaxation) calculated by setting the specified ratio of a certain power generation facility to the facility upper limit in 0.1 intervals from 0.1 to 1.0 and the weight of the adjustment variable to 0.01. As shown in the figure, it can be seen that the operating cost with upper limit relaxation is reduced according to the specified ratio. In particular, when the specified ratio is less than 0.4, the operating cost with upper limit relaxation is reduced by 20%.

[0104] In the second embodiment, in a time period including a transition period from shutdown to operation of the power generation facility, upper limit relaxation and optimization were performed in consideration of the response characteristics.

[0105] Figure 8 shows the normalized output (the value obtained by dividing the power generation output by the equipment upper limit and multiplying it by 100) when optimizing calculations are performed with the specified ratio of the equipment upper limit of a certain power generation facility set to 0.5 and the weight of the adjustment variable set to 0.01. As shown in the figure, when the upper limit is relaxed (see solid line), power is generated according to the response characteristics in the transition period from shutdown to operation in order to avoid purchasing electricity as much as possible. On the other hand, when the upper limit is not relaxed (see dashed line), output is suppressed to comply with the operational upper limit.

[0106] The cost ratio (operating cost with relaxation ÷ operating cost without relaxation) calculated by setting the specified ratio of a certain power generation facility to the facility upper limit in 0.1 intervals from 0.1 to 1.0 and the weight of the adjustment variable to 0.01 is shown in Figure 9. As shown in the figure, the operating cost does not change significantly even if the specified ratio is changed, but when the specified ratio is less than 0.4, the operating cost with upper limit relaxation is reduced by just under 10%.

[0107] In this way, the energy management support device, energy management support system, energy management device, display terminal device, energy management support method, and steelworks operation method of the present invention make it possible to set an operational upper limit to avoid equipment deterioration, and to minimize operational costs while relaxing the operational upper limit in accordance with operational costs.

[0108] The energy management support device, energy management support system, energy management device, display terminal device, energy management support method, and steelworks operation method according to the present invention have been specifically described above using the form and examples for carrying out the invention, but the gist of the present invention is not limited to these descriptions and must be broadly interpreted based on the claims. Furthermore, it goes without saying that various changes, modifications, etc. based on these descriptions are also included in the gist of the present invention. [Explanation of symbols]

[0109] 1. Energy operation support system 10. Information processing device 11 Response characteristic calculation section 12 Upper Limit Relaxation Section 13 Optimization Section 14 Output section 20 Operation plan and performance database 30 Display terminal device 31 Information Acquisition Department 32 Information display section 33 Tuning screen display section N Network

Claims

1. An energy operation support device in a steelworks, An optimization unit that optimizes the operation of energy utilities in facilities within the steelworks; an upper limit alleviation unit that sets an operational upper limit, which is an upper limit on operation, with respect to an equipment upper limit, which is an upper limit on output of the equipment capacity of the equipment; Equipped with The upper limit alleviation unit sets the operation upper limit at a target time or a target calculation period by determining a predetermined ratio with respect to the equipment upper limit, The objective function of the optimization calculation in the optimization unit includes a total energy operation cost of the steelworks and an adjustment variable of energy utility with an upper limit equal to the difference between the equipment upper limit and the operation upper limit. Energy operation support device.

2. The energy operation support device according to claim 1 , wherein the optimization unit performs the optimization calculation under a constraint that the output of the equipment is equal to or less than a sum of the operation upper limit and the adjustment variable.

3. The total energy operation cost and a cost related to the adjustment variable are included as an objective function of the optimization calculation in the optimization unit, The cost related to the adjustment variable is calculated based on the unit price of the energy utility and a predetermined weighting coefficient. The energy management assistance device according to claim 1 .

4. The energy utility is the amount of power generated by a power generation facility, The unit price of the energy utility is the cost related to the unit price of electricity purchase. The energy management assistance device according to claim 3 .

5. a response characteristic calculation unit that calculates an equipment upper limit taking into account a response characteristic of the energy utility during a transition period from shutdown to operation or from operation to shutdown based on the operation shutdown plan of the equipment; The upper limit alleviation unit sets the operation upper limit by using an equipment upper limit that takes into account the response characteristics. The energy management assistance device according to claim 1 .

6. 2. The energy operation support device according to claim 1, wherein the energy utilities include an amount of power generated by a power generation facility, an amount of by-product gas generated, and an amount of steam generated.

7. The energy operation support device according to claim 1 , further comprising an output unit that outputs information calculated by the optimization unit, the information including operational conditions of energy utilities in the facility.

8. An energy operation support system in a steelworks comprising an energy operation support device and a display terminal device, An optimization unit that optimizes the operation of energy utilities in facilities within the steelworks; an upper limit alleviation unit that sets an operational upper limit, which is an upper limit on operation, with respect to an equipment upper limit, which is an upper limit on output of the equipment capacity of the equipment; An output unit that outputs information calculated by the optimization unit, including operational conditions of energy utilities in the facility; An information acquisition unit that acquires information including optimized energy utility operation conditions in the facility; an information display unit that displays the information acquired by the information acquisition unit; Equipped with The upper limit alleviation unit sets the operation upper limit at a target time or a target calculation period by determining a predetermined ratio with respect to the equipment upper limit, The objective function of the optimization calculation in the optimization unit includes a total energy operation cost of the steelworks and an adjustment variable of energy utility with an upper limit equal to the difference between the equipment upper limit and the operation upper limit. Energy operation support system.

9. The energy operation support system according to claim 8 , wherein the optimization unit performs the optimization calculation under a constraint that an output of the facility is equal to or less than a sum of the operation upper limit and the adjustment variable.

10. The total energy operation cost and a cost related to the adjustment variable are included as an objective function of the optimization calculation in the optimization unit, The cost related to the adjustment variable is calculated based on the unit price of the energy utility and a predetermined weighting coefficient. The energy management support system according to claim 8 .

11. The energy utility is the amount of power generated by a power generation facility, The unit price of the energy utility is the cost related to the unit price of electricity purchase. The energy management support system according to claim 10.

12. a response characteristic calculation unit that calculates an equipment upper limit taking into account a response characteristic of the energy utility during a transition period from shutdown to operation or from operation to shutdown based on the operation shutdown plan of the equipment; The upper limit alleviation unit sets the operation upper limit by using an equipment upper limit that takes into account the response characteristics. The energy management support system according to claim 8 .

13. a tuning screen display unit that sets and displays the predetermined ratio of the operation upper limit to the equipment upper limit and a weighting coefficient of a cost related to the adjustment variable, The cost related to the adjustment variable is calculated based on the unit price of the energy utility and a predetermined weighting coefficient. The energy management support system according to claim 8 .

14. An energy operation device that controls equipment in a steelworks in accordance with energy utility operation conditions output from an output unit of the energy operation support device according to claim 7.

15. An energy operation device that controls equipment in a steelworks in accordance with the energy utility operation conditions output from the output unit of the energy operation support system according to claim 8.

16. A display terminal device constituting an energy operation support system in a steelworks, An information acquisition unit that acquires information including optimized energy utility operation conditions in facilities in the steelworks; an information display unit that displays the information; Equipped with The information includes optimized energy utility operating conditions in the facility calculated by an optimization calculation that minimizes an objective function including a cost related to an adjustment variable of an energy utility that relaxes an operation upper limit set for an equipment upper limit on the output of the energy equipment of the steelworks, and a total energy operating cost of the steelworks; The cost related to the adjustment variable is calculated based on the unit price of the energy utility and a predetermined weighting coefficient. Display terminal device.

17. the display terminal device includes a tuning screen display unit that sets and displays a predetermined ratio of the operation upper limit to the equipment upper limit used in the optimization calculation and a weighting coefficient of the cost related to the adjustment variable to the total energy operation cost of the steelworks, the information display unit displays the information calculated by an optimization calculation using the predetermined ratio set and displayed on the tuning screen display unit and the weighting coefficient.

17. A display terminal device according to claim 16.

18. Energy management support device at steelworks An optimization step of optimizing the operation of energy utilities in facilities within the steelworks; an operation upper limit setting step of setting an operation upper limit, which is an upper limit on operation, for an equipment upper limit, which is an upper limit on output of the equipment capacity of the equipment; Including, The operation upper limit setting step sets the operation upper limit at a target time or a target calculation period by determining a predetermined ratio to the equipment upper limit, The optimization step includes, as an objective function of the optimization calculation, a total energy operation cost of the steelworks and an adjustment variable of an energy utility with an upper limit equal to the difference between the equipment upper limit and the operation upper limit. Energy operation support methods.

19. The energy operation support device includes a response characteristic calculation step of calculating an equipment upper limit taking into account the response characteristic of the energy utility during a transition period from shutdown to operation or from operation to shutdown based on an operation shutdown plan of the equipment, The operation upper limit setting step sets the operation upper limit using an equipment upper limit taking into account the response characteristics. The energy management support method according to claim 18.

20. A method for operating a steelworks, comprising a step of operating the steelworks in accordance with decision variables calculated by the optimization calculation of the energy operation support method according to claim 19.

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