Energy operation support system, information processing device, display terminal device, energy operation support method, and method for operating iron works

Abstract

An information processing device of an energy operation support system is provided with an information acquisition unit and an optimization unit, and the optimization unit is provided with: a cost optimization unit that calculates an operation condition of an energy facility on the basis of an evaluation of the total energy operation cost of an iron making plant; a CO2 optimization unit for calculating the operation conditions of the energy equipment on the basis of the evaluation of the total CO2 emission amount of the energy operation of the iron making plant; and a CO2 cost evaluation unit that calculates a CO2 cost index in the energy use of the iron works on the basis of the total energy use cost of the iron works calculated by the cost optimization unit and the total energy use CO2 emission amount calculated by the CO2 optimization unit, and the display terminal device is provided with an information acquisition unit, an information display unit, and an output unit.

Description

Technical Field

[0001] The present invention relates to an energy application support system, an information processing device, a display terminal device, an energy application support method and an operation method of an iron and steel plant. Background Art

[0002] Generally speaking, an ironworks consists of multiple factories and multiple power generation facilities from upstream processes (blast furnace, coke oven, steelmaking process, etc.) to downstream processes (rolling process, surface treatment process, etc.), and uses the energy (gas, steam, electricity) shown below. That is, 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 factories and power generation facilities. In addition, M gas (Mixed gas) obtained by mixing these by-product gases and adjusting the heat is also used in factories and power generation facilities.

[0003] Here, when the gas supply is insufficient relative to the needs of the factory (for example, the demand in the heating furnace of a rolling mill), city gas is supplemented to meet the factory needs. In addition, when the gas supply to the power generation equipment is insufficient relative to the specified amount, heavy oil is used to supplement it. These supplementary fuels incur costs depending on the amount used. On the other hand, when the gas supply becomes excessive relative to the needs of the factory, the gas is rendered harmless by combustion and then discharged into the atmosphere, but this will cause energy loss and carbon dioxide emissions, so it should be minimized. In order to reduce costs and suppress emissions, it is necessary to effectively utilize gas containers as by-product gas storage equipment or appropriately adjust the gas distribution amount.

[0004] For example, in a gas container, when the supply of byproduct gas is greater than the required amount, the byproduct gas is stored in the gas container in preference to the emission, thereby increasing the storage amount (gas container level) and suppressing the emission. On the other hand, when the required amount of byproduct gas is greater than the supply, the demand is met by discharging the stored gas from the gas container, thereby reducing the use of supplementary fuel. In addition, when the required amount of byproduct gas is further greater than the supply, the output of the power generation equipment is reduced. In addition, when this cannot be dealt with, the operating level of the factory may be reduced.

[0005] Steam is supplied through exhaust heat recovery boilers from LD gas or sintering furnaces, CDQ (Coke Drying Quenching: Coke Drying Equipment) boilers, and exhaust from the turbine middle section of power generation equipment (operation to obtain steam from the turbine middle section. Power generation decreases). In addition, steam is used in factories (pickling tank insulation and vacuum degassing equipment in cold rolling factories). The shortfall in steam demand is purchased from outside. In addition, the power demand of the factory is met by CDQ, TRT (top-pressure Recovery Turbine: blast furnace top pressure power generation), power generation in power generation equipment, and purchase of electricity from power companies.

[0006] The amount of electricity purchased must be managed so that it does not exceed the contracted amount per hour (the upper limit of the amount of electricity purchased). In addition, since the unit price of electricity purchased varies depending on the time period, the operating conditions that minimize the cost, such as setting the output of the power generation equipment to a higher level and reducing the amount of electricity purchased, vary depending on the time period or supply and demand conditions when the unit price is high and the byproduct gas supply is excessive. Based on this background, a technology for optimizing the energy operation cost of an iron and steel plant has been proposed.

[0007] For example, in Patent Document 1, the following method is used to find the optimal energy operation conditions of an ironworks. That is, in Patent Document 1, the actual value and predicted value of the amount of energy service generated and consumed by each plant constituting the ironworks are used. Furthermore, in Patent Document 1, the total energy operation cost of the ironworks within a specified time from the current moment is used as an evaluation function, and the operation conditions of the energy equipment in the ironworks are calculated so that the value of the evaluation function becomes smaller.

[0008] Prior art literature

[0009] Patent Literature

[0010] Patent Document 1: Japanese Patent No. 7028272 Summary of the invention

[0011] Problems to be solved by the invention

[0012] However, the method proposed in Patent Document 1 has the following problems: the operation conditions of the energy equipment obtained by evaluating the total cost of energy operation in the ironworks are only calculated, and the CO2 emission amount in the energy operation is not evaluated. In addition, as a result, there is the following problem: since the cost in the CO2 emission transaction cannot be compared with the CO2 emission cost in the energy operation in the ironworks, it is impossible to achieve the optimization of the operation taking into account the CO2 emission cost.

[0013] The present invention has been made in view of the above circumstances, and its object is to provide an optimized energy operation support system, an information processing device, a display terminal device, an energy operation support method and an operation method of an iron and steel plant that can realize operations that take into account the CO2 emission costs.

[0014] Means for solving problems

[0015] In order to solve the above-mentioned problems and achieve the purpose, the energy operation support system of the present invention is an energy operation support system for an iron and steel plant, and is equipped with an information processing device and a display terminal device, wherein the information processing device comprises: an information acquisition unit, which acquires information related to the energy service of each factory constituting the iron and steel plant and information related to the operation plan of the energy equipment in the iron and steel plant; an optimization unit, which calculates the operation conditions of the energy equipment; and an output unit, which outputs the information calculated by the optimization unit including the operation conditions of the energy equipment, wherein the optimization unit comprises: a cost optimization unit, which calculates the operation conditions of the energy equipment based on the evaluation of the total cost of energy operation of the iron and steel plant; a CO2 optimization unit, which calculates the operation conditions of the energy equipment based on the evaluation of the total cost of energy operation of the iron and steel plant; and a CO2 optimization unit, which calculates the operation conditions of the energy equipment based on the evaluation of the total cost of energy operation of the iron and steel plant. The evaluation of the total CO2 emissions from the energy use of the iron and steel plant calculates the operating conditions of the energy equipment; and a CO2 cost evaluation unit calculates the CO2 cost index in the energy use of the iron and steel plant based on the total energy use cost of the iron and steel plant calculated by the cost optimization unit and the total CO2 emissions from the energy use calculated by the CO2 optimization unit. The display terminal device comprises: an information acquisition unit, which obtains at least the total energy use cost, the total CO2 emissions from the energy use and the CO2 cost index from the information processing device; and an information display unit, which displays the energy use information of the iron and steel plant including the total energy use cost, the total CO2 emissions from the energy use and the CO2 cost index.

[0016] In addition, the energy utilization support system of the present invention is that in the above invention, the cost optimization part calculates the total energy utilization cost based on the evaluation of the total energy utilization cost and the total CO2 emissions of energy utilization based on the evaluation of the total energy utilization cost, respectively, the CO2 optimization part calculates the total energy utilization cost based on the evaluation of the total CO2 emissions of energy utilization and the total CO2 emissions of energy utilization based on the evaluation of the total CO2 emissions of energy utilization, respectively, and the CO2 cost evaluation part calculates the unit price of the total CO2 emissions of energy utilization as the CO2 cost indicator based on the ratio of the difference between each total energy utilization cost and the difference between each total CO2 emissions of energy utilization, and determines whether the unit price of the total CO2 emissions of energy utilization is above the contract value provided in advance.

[0017] In addition, the energy utilization support system of the present invention is that in the above invention, the CO2 optimization unit calculates the total energy utilization cost based on the evaluation of the total CO2 emissions of energy utilization and the total CO2 emissions of energy utilization based on the evaluation of the total CO2 emissions of energy utilization in a manner such that the unit price of the total CO2 emissions of energy utilization becomes lower than the contract value.

[0018] Furthermore, the energy utilization support system of the present invention is, in the above invention, wherein the energy service includes gas, steam and electricity.

[0019] In addition, the energy utilization support system of the present invention is that in the above invention, the energy equipment includes mixed gas production equipment, gas containers, blast furnace top pressure power generation equipment and power generation equipment using by-product gas, heavy oil or exhaust gas.

[0020] In addition, the energy application support system of the present invention is that in the above invention, the information related to the application plan of the energy equipment includes the set value of the energy equipment and the contract value of the transaction contract, and the transaction contract includes a purchase contract accompanied by the use of heavy oil, city gas, and steam, a purchase contract accompanied by the purchase of electricity, and a transaction contract when trading CO2 emissions.

[0021] Furthermore, in the energy operation support system of the present invention, in the above invention, the total energy operation cost includes a cost associated with the use of heavy oil, city gas, and steam, and a cost associated with the purchase of electricity.

[0022] In addition, the energy utilization support system of the present invention is that in the above invention, the total CO2 emissions from energy utilization include CO2 emissions associated with the use of heavy oil, city gas and steam, CO2 emissions associated with the purchase of electricity, and CO2 emissions associated with the use of blast furnace gas, coke oven gas and steelmaking gas produced as by-product gases in iron and steel plants.

[0023] In order to solve the above-mentioned problems and achieve the purpose, the information processing device of the present invention is an information processing device that, together with a display terminal device, constitutes an energy operation support system in an iron and steel plant, wherein the information processing device comprises: an information acquisition unit, which acquires information related to the energy service of each factory constituting the iron and steel plant and information related to the operation plan of the energy equipment in the iron and steel plant; an optimization unit, which calculates the operation conditions of the energy equipment; and an output unit, which outputs the information calculated by the optimization unit including the operation conditions of the energy equipment, the optimization unit comprising: a cost optimization unit, which calculates the operation conditions of the energy equipment based on the evaluation of the total cost of energy operation of the iron and steel plant; a CO2 optimization unit, which calculates the operation conditions of the energy equipment based on the evaluation of the total CO2 emissions from the energy operation of the iron and steel plant; and a CO2 cost evaluation unit, which calculates the CO2 cost index in the energy operation of the iron and steel plant based on the total cost of energy operation of the iron and steel plant calculated by the cost optimization unit and the total CO2 emissions from energy operation calculated by the CO2 optimization unit.

[0024] In order to solve the above-mentioned problems and achieve the purpose, the display terminal device of the present invention is a display terminal device that, together with an information processing device, constitutes an energy utilization support system in an iron and steel plant, wherein the display terminal device obtains: the operating conditions of the energy equipment and the total energy utilization cost calculated based on the evaluation of the total energy utilization cost of the iron and steel plant in the cost optimization section of the information processing device; the operating conditions of the energy equipment and the total CO2 emissions from energy utilization calculated based on the evaluation of the total CO2 emissions from the energy utilization of the iron and steel plant in the CO2 optimization section of the information processing device; and the CO2 cost index calculated in the CO2 cost evaluation section of the information processing device, and the display terminal device displays the energy utilization information of the iron and steel plant including the total energy utilization cost, the total CO2 emissions from energy utilization and the CO2 cost index.

[0025] In order to solve the above-mentioned problems and achieve the purpose, the energy operation support method of the present invention is an energy operation support method for an iron and steel plant, comprising: an information acquisition step, in which an information acquisition unit of an information processing device acquires information related to the energy service of each factory constituting the iron and steel plant and information related to the operation plan of the energy equipment in the iron and steel plant; an optimization step, in which the optimization unit of the information processing device calculates the operation conditions of the energy equipment; an output step, in which the output unit of the information processing device outputs the information calculated in the optimization step including the operation conditions of the energy equipment; and an information display step using a display terminal device, the optimization step comprising: a cost optimization step A step of calculating the operating conditions of the energy equipment based on the evaluation of the total cost of energy use of the iron and steel plant; a CO2 optimization step of calculating the operating conditions of the energy equipment based on the evaluation of the total CO2 emissions from the energy use of the iron and steel plant; and a CO2 cost evaluation step of calculating the CO2 cost index in the energy use of the iron and steel plant based on the total cost of energy use of the iron and steel plant calculated in the cost optimization step and the total CO2 emissions from energy use calculated in the CO2 optimization step, wherein the information display step displays the energy use information of the iron and steel plant including the total cost of energy use, the total CO2 emissions from energy use and the CO2 cost index.

[0026] In order to solve the above-mentioned problems and achieve the purpose, the operation method of the ironworks of the present invention changes the operation conditions of the ironworks based on the energy operation information of the ironworks displayed by the display terminal device of the energy operation support system.

[0027] Effects of the Invention

[0028] In the energy operation support system, information processing device, display terminal device, energy operation support method and ironworks operation method of the present invention, cost optimization and CO2 emission optimization are performed in the optimization calculation process. Thus, the total energy operation cost and the total CO2 emission of energy operation can be calculated respectively, and the difference in the total energy operation cost and the difference in the total CO2 emission of energy operation can be evaluated. As a result, the optimization of the operation taking into account the CO2 emission cost can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a diagram showing a schematic configuration of an energy operation support system according to an embodiment of the present invention.

[0030] Figure 2 This is a diagram showing a schematic configuration of an information processing device according to an embodiment of the present invention.

[0031] Figure 3 This is a flowchart showing the flow of an energy management support method executed by the energy management support system according to the embodiment of the present invention.

[0032] Figure 4 This is a diagram showing the transition of the total CO2 emission unit price of energy operation when the optimization calculation is performed without setting the constraint that the total CO2 emission unit price of energy operation is equal to or less than the contract value as an embodiment of the present invention.

[0033] Figure 5 This is a diagram showing the transition of the total CO2 emission unit price of energy operation when the optimization calculation is performed with a constraint that the total CO2 emission unit price of energy operation is equal to or less than the contract value as an embodiment of the present invention. DETAILED DESCRIPTION

[0034] The energy application support system, information processing device, display terminal device, energy application support method and ironworks operation method of the embodiments of the present invention are described with reference to the accompanying drawings. It should be noted that the constituent elements in the following embodiments include elements that can be easily replaced by those skilled in the art or elements that are substantially the same.

[0035] (Energy Utilization Support System)

[0036] Reference Figure 1 and Figure 2 The energy operation support system of the embodiment will be described. The energy operation support system is a system used in, for example, a steelmaking plant, and calculates the optimal energy operation conditions in the steelmaking plant. Figure 1 As shown, the energy operation support system 1 includes an information processing device 10 , an operation plan and performance database 20 , and a display terminal device 30 .

[0037] The information processing device 10, the operation plan and performance database 20, and the display terminal device 30 are configured to be communicable via a network N such as an Internet network. The display terminal device 30 in the energy operation support system is disposed in a steelworks, for example.

[0038] (Information Processing Device)

[0039] The information processing device 10 is implemented by, for example, a general-purpose computer such as a workstation or a personal computer, or a server configured on the cloud, etc. In addition, the information processing device 10 may include information input components such as a keyboard, a mouse pointer, and numeric keys.

[0040] The information processing device 10 includes, for example, a processor (calculation processing device) composed of a CPU (Central Processing Unit) and the like, and a memory (main storage unit) composed of a RAM (Random Access Memory) and a ROM (Read Only Memory) and the like. In the information processing device 10, the processor executes a computer program and controls each component, thereby realizing functions that meet the prescribed purpose. The information processing device 10 functions as an information acquisition unit 11, an optimization unit 12, and an output unit 13 by executing the computer program.

[0041] In addition, the information processing device 10 may include a storage unit for storing various processing results, etc. The storage unit is composed of recording media such as EPROM (Erasable Programmable ROM), hard disk drive (HDD), solid state drive (SSD) and removable media. Examples of removable media include USB (Universal Serial Bus) memory, CD (Compact Disc), DVD (Digital Versatile Disc), and BD (Blu-ray (registered trademark) Disc) recording media.

[0042] The information acquisition unit 11 acquires information related to energy services of each plant constituting the steelworks and information related to the operation plan of energy equipment in the steelworks from the operation plan / performance database 20 .

[0043] Here, as "information related to energy services", the performance value and predicted value of the energy service generation amount, the performance value and predicted value of the energy service consumption amount, etc. can be listed. In addition, in "energy services", for example, gas, steam, and electricity are included. In addition, as "information related to the operation plan of energy equipment", the setting value of energy equipment, the contract value of transaction contract, etc. can be listed. In addition, in "energy equipment", for example, mixed gas manufacturing equipment, gas containers, blast furnace top pressure power generation equipment, and power generation equipment using by-product gas, heavy oil or exhaust gas are included. In addition, in "transaction contracts", for example, purchase contracts accompanied by the use of heavy oil, city gas, and steam, purchase contracts accompanied by the purchase of electricity, and transaction contracts when trading CO2 emissions are included.

[0044] The optimization unit 12 calculates the operating conditions of the energy equipment in the ironworks. For example, the optimization unit 12 calculates the operating conditions of the energy equipment within a predetermined time from the current time. Figure 2As shown, the optimization unit 12 includes a cost optimization unit 121 , a CO 2 optimization unit 122 , and a CO 2 cost evaluation unit 123 .

[0045] The cost optimization unit 121 calculates the operating conditions of the energy equipment based on the evaluation of the total energy operation cost of the ironworks. For example, the cost optimization unit 121 uses the total energy operation cost of the ironworks within a specified time from the current moment as an evaluation function, and calculates the operating conditions of the energy equipment in the ironworks that will reduce the value of the evaluation function.

[0046] As described later, the cost optimization unit 121 calculates the total energy operation cost (“total_cost” in Table 6 described later) based on the evaluation of the total energy operation cost (that is, using the total energy operation cost as the evaluation function). costmin (k)”). In addition, as described later, the cost optimization unit 121 calculates the total CO2 emission of energy operation based on the evaluation of the total energy operation cost (“total_CO2 costmin (k)”).

[0047] Here, the "total energy use cost" includes, for example, the cost associated with the use of heavy oil, city gas, and steam, and the cost associated with the purchase of electricity. In addition, the "total CO2 emissions from energy use" includes, for example, the CO2 emissions associated with the use of heavy oil, city gas, and steam, the CO2 emissions associated with the purchase of electricity, and the CO2 emissions associated with the use of blast furnace gas, coke oven gas, and steelmaking gas generated as by-product gases in iron and steel plants.

[0048] The CO2 optimization unit 122 calculates the operating conditions of the energy equipment based on the evaluation of the total CO2 emissions of the energy operation of the ironworks. For example, the CO2 optimization unit 122 uses the total CO2 emissions of the energy operation of the ironworks within a specified time from the current moment as an evaluation function, and calculates the operating conditions of the energy equipment in the ironworks where the value of the evaluation function becomes smaller.

[0049] In addition, as described later, the CO2 optimization unit 122 calculates the total energy operation cost ("total_cost" in Table 6 described later) based on the evaluation of the total CO2 emission of energy operation (that is, using the total CO2 emission of energy operation as the evaluation function). CO2min (k)”). In addition, as described later, the CO2 optimization unit 122 calculates the total CO2 emission of energy operation (“total_CO2” in Table 6 described later) based on the evaluation of the total CO2 emission of energy operation. CO2min (k)”).

[0050] In addition, the CO2 optimization unit 122 calculates the total energy operation cost (total_cost) based on the evaluation of the total CO2 emission of energy operation. CO2min(k)) and the total CO2 emissions from energy use (total_CO2 CO2min (k)). In addition, the CO2 optimization unit 122 calculates the total energy operation cost and the total energy operation CO2 emission so that the CO2 cost indicator "energy operation total CO2 emission unit price" calculated by the CO2 cost evaluation unit 123 becomes less than a predetermined contract value.

[0051] The CO2 cost evaluation unit 123 calculates the CO2 cost index in the energy use of the ironworks based on the total energy use cost of the ironworks calculated by the cost optimization unit 121 and the total CO2 emissions from energy use calculated by the CO2 optimization unit 122. Specifically, the CO2 cost evaluation unit 123 calculates the total CO2 emissions unit price from energy use as a CO2 cost index. The total CO2 emissions unit price from energy use is calculated based on the total energy use cost (total_cost costmin (k), total_cost CO2min (k)) and the total CO2 emissions of each energy use (total_CO2 costmin (k), total_CO2 CO2min (k)) is calculated. In addition, the total cost of each energy operation (total_cost costmin (k), total_cost CO2min (k)) and the total CO2 emissions of each energy use (total_CO2 costmin (k), total_CO2 CO2min (k)) is calculated by the cost optimization unit 121 and the CO2 optimization unit 122. Then, the CO2 cost evaluation unit 123 determines whether the energy operation total CO2 emission unit price is greater than the contract value provided in advance.

[0052] Here, the “unit price of total CO 2 emissions from energy use” refers to the cost per unit of CO 2 emissions, and specifically, indicates the cost required to reduce 1 ton of CO 2 emissions.

[0053] The output unit 13 sends various information to other terminal devices and other information processing devices via the network N. As information sent by the output unit 13, for example, the operating conditions of the energy equipment calculated by the cost optimization unit 121 and the CO2 optimization unit 122, the CO2 cost index calculated by the CO2 cost evaluation unit 123, etc. can be listed. In addition, as information sent by the output unit 13, the determination result of whether the unit price of the total CO2 emission of energy operation made by the CO2 cost evaluation unit 123 is above the contract value, etc. can be listed. In addition, in other information processing devices to which the output unit 13 sends various information, a control computer for each energy device can be included. The control computer can control each energy device according to the operating conditions of the energy device sent. In addition, the control computer can accept corrections made by the operator to control each energy device.

[0054] In addition, the output unit 13 can display the above-mentioned various information through a display device (e.g., a liquid crystal display (LCD), an organic EL display (OLED), a touch panel display, etc.) not shown in the figure connected to the information processing device 10. In addition, the output unit 13 can display the adjustment screens during various calculations in the optimization unit 12. In addition, the output unit 13 can be configured using a display device, and the above-mentioned various information, adjustment screens, etc. can be displayed.

[0055] (Operational plan and performance database)

[0056] The operation plan and performance database 20 is stored in a storage device including a recording medium such as an EPROM (Erasable Programmable ROM), a hard disk drive (HDD), or a removable medium, for example.

[0057] The operation plan and performance database 20 stores information related to the operation plan of the ironworks (hereinafter referred to as "operation plan information") and information related to the operation performance (hereinafter referred to as "operation performance information"). The operation plan information and the operation performance information are stored, for example, by an operation plan device and an operation performance device (not shown), and then collected and stored in the operation plan and performance database 20 by a collection device (not shown). In addition, the operation plan and performance database 20 can be composed of a database server provided on the network N.

[0058] (Display terminal device)

[0059] The display terminal device 30 acquires and displays various information from the information processing device 10. The display terminal device 30 is realized by, for example, a personal computer connected to the information processing device 10 via the network N. The display terminal device 30 has, for example, the function of an information acquisition unit and the function of an information display unit.

[0060] The information acquisition unit acquires, for example, from the information processing device 10 the operation conditions of the energy equipment and the total energy operation cost calculated based on the evaluation of the total energy operation cost of the ironworks in the cost optimization unit 121. In addition, the information acquisition unit acquires the operation conditions of the energy equipment and the total CO2 emission of the energy operation calculated based on the evaluation of the total CO2 emission of the energy operation of the ironworks in the CO2 optimization unit 122, and the CO2 cost index calculated in the CO2 cost evaluation unit 123. In addition, the information display unit displays the energy operation information of the ironworks including the total energy operation cost, the total CO2 emission of the energy operation, and the CO2 cost index through a display device (not shown) connected to the display terminal device 30.

[0061] In addition, the display terminal device 30 can be configured using a display device, and the energy usage information acquired from the information processing device 10 via the network N can be displayed.

[0062] (How an ironworks works operates)

[0063] In the ironworks operation method of the embodiment, the operation is performed while changing the operation conditions of the ironworks such as storage and expenditure of gas containers, external fuel (town gas and heavy oil), and purchase of electricity based on the energy operation information of the ironworks including the total energy operation cost, the total CO2 emission of energy operation, and the CO2 cost index displayed by the display terminal device 30. At this time, the change amount of the operation condition can be indicated via the display terminal device 30.

[0064] (Energy utilization support method)

[0065] Reference Figure 3 The energy operation support method performed by the energy operation support system of the embodiment is described. As shown in the figure, the energy operation support method includes an information acquisition step (steps S1 to S4), a cost optimization step (step S5), a CO2 optimization step (step S6), and a CO2 cost evaluation step (step S7).

[0066] Figure 3 The flowchart shown starts when an execution instruction of the optimization calculation process is input to the information processing device 10, and the optimization calculation process enters the process of step S1. In addition, steps S1 to S4 may be executed in different orders or at the same timing.

[0067] <Step S1>

[0068] In the processing of step S1, the information acquisition unit 11 obtains the data of the set values ​​of the energy equipment in the iron and steel plant as the input data of the optimization calculation processing. Specifically, as shown in the following Table 1, the information acquisition unit 11 obtains the following data. It should be noted that in the following Table 1, "x" is the number of generators. Thus, the processing of step S1 is completed, and the optimization calculation processing enters the processing of step S2.

[0069] Upper limit of power generation (x = 1U ~ NU) UB POW X

[0070] Lower limit of power generation (x = 1U ~ NU) LB POW X

[0071] Upper limit of power generation change (x = 1U ~ NU) UB POWDIF X

[0072] Lower limit of power generation change (x = 1U ~ NU) LB POWDIF X

[0073] B Gas container upper limit (storage capacity) UB B LEVEL

[0074] B Gas container lower limit (storage capacity) LB B LEVEL

[0075] B Gas container upper limit (intake and discharge) UB B INOUT

[0076] B Gas container lower limit (intake and discharge) LB B INOUT

[0077] C Gas container upper limit (storage capacity) UB C LEVEL

[0078] C Gas container lower limit (storage capacity) LB C LEVEL

[0079] C Gas container upper limit (intake and discharge) UB C INOUT

[0080] C Gas container lower limit (intake and discharge) LB C INOUT

[0081] LD gas container upper limit (storage capacity) UB LD LEVEL

[0082] LD gas container lower limit (storage capacity) LB LD LEVEL

[0083] LD gas container upper limit (intake and discharge) UB LD INOUT

[0084] LD gas container lower limit (intake and discharge) LB LD INOUT

[0085] [Table 1]

[0086] (Table 1)

[0087]

[0088] <Step S2>

[0089] In the processing of step S2, the information acquisition unit 11 obtains the data of the contract value required for calculating the cost involved in the energy operation of the iron and steel plant as the input data for the optimization calculation processing. Specifically, as shown in the following Table 2, the information acquisition unit 11 obtains the following data. It should be noted that in the following Table 2, k=0 is the present, and k=1~N is the future. In addition, "N" is the final time period of the optimization calculation. For example, when N=24, 1 time period=5 minutes, it means the future 2 hours later. Thus, the processing of step S2 is completed, and the optimization calculation processing enters the processing of step S3.

[0090] Electricity purchase price P ELE (k)

[0091] Steam purchase price P ST (k)

[0092] Heavy oil purchase price P OIL (k)

[0093] City gas purchase price P TOG (k)

[0094] Electricity CO2 emission coefficient CO2 ELE (k)

[0095] Steam CO2 emission coefficient CO2 ST (k)

[0096] Heavy oil CO2 emission coefficient CO2 OIL (k)

[0097] City gas CO2 emission coefficient CO2 TOG (k)

[0098] B gas CO2 emission coefficient CO2 B (k)

[0099] C gas CO2 emission coefficient CO2 C (k)

[0100] LD gas CO2 emission coefficient CO2 LD (k)

[0101] CO2 trading price P CO2 (k)

[0102] [Table 2]

[0103] (Table 2)

[0104]

[0105] <Step S3>

[0106] In the processing of step S3, the information acquisition unit 11 acquires the data of the performance value of the energy service of the factory in the iron and steel plant at the current time (k = 0) as the input data of the optimization calculation processing. Specifically, as shown in the following Table 3 (second column), the information acquisition unit 11 acquires the following data as the data of the performance value of the energy service at the current time (k = 0).

[0107] B Gas Generation (Total Factory) S B (0)

[0108] C gas generation (factory total) S C (0)

[0109] LD gas generation (factory total) S LD (0)

[0110] Steam generation (factory total) S ST (0)

[0111] TRT power generation (all generators) S TRTELE (0)

[0112] B Gas usage (factory total) D B (0)

[0113] C Gas usage (factory total) D C (0)

[0114] LD gas usage (factory total) D LD (0)

[0115] M Gas usage (factory total) D M PLANT (0)

[0116] Steam usage (factory total) D ST (0)

[0117] Electricity usage (factory total) D ELE (0)

[0118] [Table 3]

[0119] (Table 3)

[0120]

[0121] In addition, as shown in Table 4 (second column) and Table 5 (second column) below, the information acquisition unit 11 acquires the following data as the performance value data of the energy service at the current time (k=0): Thus, the processing of step S3 is completed, and the optimization calculation processing proceeds to the processing of step S4.

[0122] B Gas usage (x = 1U ~ NU) D B X (0)

[0123] C Gas usage (x = 1U ~ NU) D C X (0)

[0124] LD gas usage (x = 1U ~ NU) D LD X (0)

[0125] M Gas usage (x = 1U ~ NU) D M X (0)

[0126] Heavy oil usage (x = 1U ~ NU) D OIL X (0)

[0127] Air extraction volume (x=1U~NU)S ST X (0)

[0128] City gas usage (for power generation equipment) D TOG POW (0)

[0129] City gas usage (factory use) D TOG Mill (0)

[0130] B Gas container (storage capacity) H B LEVEL (0)

[0131] B Gas container (intake and discharge) H B INOUT (0)

[0132] C Gas container (storage capacity) H C LEVEL (0)

[0133] C Gas container (intake and discharge) H C INOUT (0)

[0134] LD gas container (storage capacity) H LD LEVEL (0)

[0135] LD gas container (intake and discharge) H LD INOUT (0)

[0136] Electricity purchase amount S ELE Purchase (0)

[0137] Steam purchase amount SST Purchase (0)

[0138] M gas (B gas) for power generation equipment D B POW (0)

[0139] M gas (C gas) for power generation equipment D C POW (0)

[0140] M gas (LD gas) for power generation equipment LD POW (0)

[0141] M gas (city gas) for power generation equipment TOG POW (0)

[0142] M gas (B gas) for factory use D B Mill (0)

[0143] M gas (C gas) for factory use C Mill (0)

[0144] M gas for factory use (LD gas) D LD Mill (0)

[0145] M gas for factory use (city gas) D TOG Mill (0)

[0146] Total energy cost total_cost(0)

[0147] Total CO2 emissions from energy use total_CO2(0)

[0148] [Table 4]

[0149] (Table 4)

[0150]

[0151] [Table 5]

[0152] (Table 5)

[0153]

[0154] <Step S4>

[0155] In the process of step S4, the information acquisition unit 11 acquires the data of the predicted value of the energy service of the factory in the ironworks in the future (k=1~N) as the input data of the optimization calculation process. Specifically, as shown in the above Table 3 (third column), the information acquisition unit 11 acquires the following data as the data of the predicted value of the energy service in the future (k=1~N). Thus, the process of step S4 is completed, and the optimization calculation process enters the process of step S5.

[0156] B Gas Generation (Total Factory) SB (k)

[0157] C gas generation (factory total) S C (k)

[0158] LD gas generation (factory total) S LD (k)

[0159] Steam generation (factory total) S ST (k)

[0160] TRT power generation (all generators) S TRTELE (k)

[0161] B Gas usage (factory total) D B (k)

[0162] C Gas usage (factory total) D C (k)

[0163] LD gas usage (factory total) D LD (k)

[0164] M Gas usage (factory total) D M PLANT (k)

[0165] Steam usage (factory total) D ST (k)

[0166] Electricity usage (factory total) D ELE (k)

[0167] <Step S5>

[0168] In the processing of step S5, the cost optimization unit 121 uses the data obtained in the processing of steps S1 to S4 to perform optimization calculations, and the optimization calculations find the conditions for minimizing the total energy operation cost total_cost(k) involved in the energy operation of the iron and steel plant within a specified period in the future (k=1~N).

[0169] As shown in Table 4 (third column) and Table 5 (third column) described above, the decision variables (variables to be searched so as to minimize the cost) in the optimization calculation of step S5 are as follows.

[0170] B Gas usage (x = 1U ~ NU) D B X (k)

[0171] C Gas usage (x = 1U ~ NU) D C X (k)

[0172] LD gas usage (x = 1U ~ NU) D LD X (k)

[0173] M Gas usage (x = 1U ~ NU) D M X (k)

[0174] Heavy oil usage (x = 1U ~ NU) D OIL X (k)

[0175] Air extraction volume (x=1U~NU)S ST X (k)

[0176] City gas usage (for power generation equipment) D TOG POW (k)

[0177] City gas usage (factory use) D TOG Mill (k)

[0178] B Gas container (storage capacity) H B LEVEL (k)

[0179] B Gas container (intake and discharge) H B INOUT (k)

[0180] C Gas container (storage capacity) H C LEVEL (k)

[0181] C Gas container (intake and discharge) H C INOUT (k)

[0182] LD gas container (storage capacity) H LDLEVEL (k)

[0183] LD gas container (intake and discharge) H LD INOUT (k)

[0184] Electricity purchase amount S ELE Purchase (k)

[0185] Steam purchase amount S ST Purchase (k)

[0186] M gas (B gas) for power generation equipment D B POW (k)

[0187] M gas (C gas) for power generation equipment D C POW (k)

[0188] M gas (LD gas) for power generation equipment LD POW (k)

[0189] M gas (city gas) for power generation equipment TOG POW (k)

[0190] M gas (B gas) for factory use D B Mill (k)

[0191] M gas (C gas) for factory use C Mill (k)

[0192] M gas for factory use (LD gas) D LD Mill (k)

[0193] M gas for factory use (city gas) D TOG Mill (k)

[0194] Total energy cost total_cost(k)

[0195] Total CO2 emissions from energy use total_CO2(k)

[0196] In addition, in step S5, during the optimization calculation, the constraint conditions shown in the following equations (1) to (15) are set. It should be noted that "T" in the following equations (6) and (11) is a time conversion value of 1 period. For example, when 1 period = 5 minutes, it becomes T = 5 / 60 (h).

[0197] [Mathematical formula 1]

[0198]

[0199] [Mathematical formula 2]

[0200]

[0201] [Mathematical formula 3]

[0202]

[0203] [Formula 4]

[0204] D M PLANT (k) = D B Mill (k)+D C Mill (k)+D LD Mill (k)+D TOG Mill (k)…(4)

[0205] [Mathematical formula 5]

[0206]

[0207] [Mathematical formula 6]

[0208]

[0209] [Formula 7]

[0210] S POWj (k) = f j (D Bj (k)+D Cj(k)+D LDj (k)+D Mj (k)+D OILj (k), S STj (k))…(7)

[0211] [Mathematical formula 8]

[0212]

[0213] [Mathematical formula 9]

[0214]

[0215] [Formula 10]

[0216] LB POWj ≤S POWj (k)≤UB POWj …(10)

[0217] [Mathematical formula 11]

[0218] LB POWDIFj ≤(S POWj (k)-S POWj (k-1)) / T≤UB POWDIFj …(11)

[0219] [Mathematical formula 12]

[0220]

[0221] [Mathematical formula 13]

[0222]

[0223] [Formula 14]

[0224]

[0225] [Mathematical formula 15]

[0226]

[0227] As shown in the above formula (14), the total energy operation cost total_cost (k) to be minimized in step S5 is the sum of heavy oil (OIL), city gas (TOG), steam (ST) and purchased electricity (ELE) as supplementary fuel. In addition, the unit prices of each are shown in the above table 2, and the total value of the cost from the current time to N cycles is calculated as shown in the following formula (16). Thus, the processing of step S5 is completed, and the optimization calculation processing enters the processing of step S6.

[0228] [Formula 16]

[0229]

[0230] <Step S6>

[0231] In the process of step S6, the CO2 optimization unit 122 uses the data obtained in the processes of steps S1 to S4 to perform optimization calculations. In this optimization calculation, the conditions for minimizing the total CO2 emissions total_CO2(k) of the energy operation of the ironworks in a future predetermined period (k=1 to N) are determined.

[0232] The decision variables (variables to be searched in a manner to minimize the cost) in the optimization calculation of step S6 are the same as those in step S5 (refer to Table 4 (third column) and Table 5 (third column)). In addition, in step S6, as in step S5, the constraints shown in the above equations (1) to (15) are set during the optimization calculation.

[0233] The total CO2 emission from energy use total_CO2(k) to be minimized in step S6 is as shown in the above formula (15). That is, the total CO2 emission from energy use total_CO2(k) is the sum of the heavy oil (OIL), town gas (TOG), steam (ST), electricity purchase (ELE), B gas usage (D B )、C Gas usage (D C ) and LD gas usage (D LD ). In addition, the respective discharge coefficients are shown in Table 2 above, and as shown in the following formula (17), the total value of the cost from the current time to the Nth cycle is calculated using them. Thus, the processing of step S6 is completed, and the optimization calculation processing enters the processing of step S7.

[0234] [Mathematical formula 17]

[0235]

[0236] <Step S7>

[0237] In the processing of step S7, the CO2 cost evaluation unit 123 calculates the total CO2 emission unit price (CO2 cost index) of energy operation related to the energy operation of the ironworks in the future specified period (k=1~N). In the processing of this step S7, the total CO2 emission unit price (CO2 cost index) of energy operation is calculated based on the total energy operation cost and the total CO2 emission of energy operation in the future specified period (k=1~N) obtained by the optimal calculation in the processing of steps S5 and S6.

[0238] Specifically, in the process of step S7, as shown in Table 6 below, the following data calculated by the cost optimization unit 121 and the CO2 optimization unit 122 are used. Then, as shown in the following formula (18-1), the difference between the total cost of each energy operation and the total CO2 emission of each energy operation (total_CO2 costmin (k), total_CO2 CO2min (k)) to calculate the total CO2 emission unit price of energy use.

[0239] The total cost of energy use (total_cost) is minimized costmin (k))

[0240] Total CO2 emissions from energy use with minimal cost (total_CO2 costmin (k))

[0241] The total cost of energy utilization (total_cost) CO2min (k))

[0242] Total CO2 emissions from energy use resulting from CO2 minimization (total_CO2 CO2min (k))

[0243] [Table 6]

[0244] (Table 6)

[0245]

[0246] [Mathematical formula 18]

[0247]

[0248] It should be noted that in the process of step S7, in order to determine whether the total CO2 emission unit price of energy operation is greater than the predetermined contract value, as shown in the above formula (18-2), the contract value (P CO2 (k)) The total CO2 emission unit price of energy operation is normalized and calculated. Thus, the processing of step S7 is completed, and a series of optimization calculation processing ends.

[0249] Here, in the processing of the above-mentioned step S6, the restriction condition shown in the following formula (19-1) may be set in such a way that the unit price of the total CO2 emission of energy operation becomes less than the predetermined contract value. The restriction condition is set based on the total cost of energy operation and the total CO2 emission of energy operation which are calculated in advance as an evaluation function by the CO2 cost evaluation unit 123 in such a way as to minimize the total CO2 emission of energy operation. It should be noted that since the following formula (19-1) is a nonlinear restriction, it can be converted into a linear restriction shown in the following formula (19-2) when it is processed as a linear optimization problem.

[0250] [Mathematical formula 19]

[0251]

[0252] In the energy operation support system, information processing device, display terminal device, energy operation support method, and ironworks operation method of the above-described embodiments, cost optimization and CO2 emission optimization are performed in the optimization calculation process. Thus, the total energy operation cost and the total CO2 emission of energy operation can be calculated respectively, and the difference in the total energy operation cost and the difference in the total CO2 emission of energy operation can be evaluated. As a result, the optimization of the operation taking into account the CO2 emission cost can be achieved.

[0253] (Example)

[0254] Reference Figure 4 and Figure 5 An embodiment of the energy use support method of the present invention will be described. In this embodiment, one cycle is set to 5 minutes, and optimization calculations are performed up to 24 cycles, and the calculation results are displayed on a display terminal device.

[0255] Figure 4 The figure shows the change of the total CO2 emission unit price of energy use when the optimization calculation is performed without setting the restriction condition that the total CO2 emission unit price of energy use becomes less than the contract value (CO2 transaction price) (the above formulas (19-1) and (19-2)). As shown in the figure, if the change of the total CO2 emission unit price of energy use calculated by the information processing device is observed, it can be seen that the total CO2 emission unit price of energy use is greater than the contract value. In other words, it can be seen that the time period when "the total CO2 emission unit price of energy use ÷ the contract value" becomes greater than 1 is the time period of 14 to 15 cycles.

[0256] Thus, the energy operation support method of the present invention can guide the time period when the unit price of the total CO2 emission of energy operation is equal to or higher than the contract value. This can promote CO2 transactions in accordance with the contract value from the perspective of cost.

[0257] Figure 5The figure shows the change of the total CO2 emission unit price of energy operation when the optimization calculation is performed with the constraint that the total CO2 emission unit price of energy operation is less than the contract value (the above equations (19-1) and (19-2)). Figure 4 It can be seen that even in the period of 14-15 cycles when the total CO2 emission unit price of energy use was above the contract value, the total CO2 emission unit price of energy use was below the contract value. In other words, it can be seen that "the total CO2 emission unit price of energy use ÷ the contract value" is less than 1.

[0258] Thus, in the energy operation support method of the present invention, the optimization calculation is performed under the constraint that the total CO2 emission unit price of energy operation is less than the contract value. Thus, the operation can be performed while suppressing the total CO2 emission unit price of energy operation from exceeding the contract value.

[0259] The energy application support system, information processing device, display terminal device, energy application support method and ironworks operation method of the present invention are specifically described above using the methods and embodiments for implementing the invention, but the purpose of the present invention is not limited to these records and must be interpreted broadly based on the records of the claims. In addition, solutions formed by various changes and modifications based on these records are of course also included in the purpose of the present invention.

[0260] Description of Reference Numerals

[0261] 1 Energy utilization support system

[0262] 10 Information processing device

[0263] 11 Information Acquisition Department

[0264] 12 Optimization Department

[0265] 121 Cost Optimization Department

[0266] 122 CO2 Optimization Department

[0267] 123 CO2 Cost Evaluation Department

[0268] 13 Output section

[0269] 20 Operational plan and performance database

[0270] 30 Display terminal device

[0271] N Network

Claims

1. An energy utilization support system, which is an energy utilization support system for an iron and steel plant, comprising an information processing device and a display terminal device, wherein: The information processing device comprises: an information acquisition unit that acquires information related to energy services of each plant constituting the steelworks and information related to an operation plan of energy equipment in the steelworks; an optimization unit for calculating the operating conditions of the energy device; and an output unit that outputs information calculated by the optimization unit including operating conditions of the energy device, The optimization unit comprises: a cost optimization unit that calculates operating conditions of the energy equipment based on an evaluation of the total energy operating cost of the ironworks; A CO2 optimization unit that calculates operating conditions of the energy equipment based on an evaluation of the total CO2 emissions from energy operations of the ironworks; and A CO2 cost evaluation unit calculates a CO2 cost index in energy operation of the ironworks based on the total energy operation cost of the ironworks calculated by the cost optimization unit and the total CO2 emission from energy operation calculated by the CO2 optimization unit, The display terminal device comprises: an information acquisition unit that acquires at least the total energy operation cost, the total CO2 emission of the energy operation, and the CO2 cost index from the information processing device; and An information display unit displays energy utilization information of the ironworks including the total energy utilization cost, the total CO 2 emission from energy utilization, and the CO 2 cost index.

2. The energy utilization support system according to claim 1, wherein: The cost optimization unit calculates the total energy operation cost based on the evaluation of the total energy operation cost and the total CO2 emission of energy operation based on the evaluation of the total energy operation cost, respectively. The CO2 optimization unit calculates the total energy operation cost based on the evaluation of the total CO2 emission amount of the energy operation and the total CO2 emission amount of the energy operation based on the evaluation of the total CO2 emission amount of the energy operation, respectively. The CO2 cost evaluation unit calculates the unit price of total CO2 emissions from energy use as the CO2 cost indicator based on the ratio of the difference between the total costs of each energy use and the difference between the total CO2 emissions from each energy use, and determines whether the unit price of total CO2 emissions from energy use is above the contract value provided in advance.

3. The energy utilization support system according to claim 2, wherein: The CO2 optimization unit calculates the total energy operation cost based on the evaluation of the total CO2 emission of energy operation and the total CO2 emission of energy operation based on the evaluation of the total CO2 emission of energy operation so that the unit price of the total CO2 emission of energy operation becomes lower than the contract value.

4. The energy operation support system according to claim 1, wherein: The energy services include gas, steam and electricity.

5. The energy utilization support system according to claim 1, wherein: The energy equipment includes mixed gas manufacturing equipment, gas containers, blast furnace top pressure power generation equipment and power generation equipment using by-product gas, heavy oil or exhaust gas.

6. The energy utilization support system according to claim 1, wherein: The information related to the operation plan of the energy equipment includes the set value of the energy equipment and the contract value of the transaction contract, The transaction contracts include a purchase contract involving the use of heavy oil, city gas, and steam, a purchase contract involving the purchase of electricity, and a transaction contract for trading CO2 emissions.

7. The energy utilization support system according to claim 1, wherein: The total energy operation cost includes the cost associated with the use of heavy oil, city gas and steam, and the cost associated with the purchase of electricity.

8. The energy utilization support system according to claim 1, wherein: The total CO2 emissions from energy use include CO2 emissions associated with the use of heavy oil, city gas and steam, CO2 emissions associated with purchased electricity, and CO2 emissions associated with the use of blast furnace gas, coke oven gas and steelmaking gas produced as by-product gases in iron and steel plants.

9. An information processing device, which together with a display terminal device constitutes an energy operation support system in an ironworks, wherein: The information processing device comprises: an information acquisition unit that acquires information related to energy services of each plant constituting the steelworks and information related to an operation plan of energy equipment in the steelworks; an optimization unit for calculating the operating conditions of the energy device; and an output unit that outputs information calculated by the optimization unit including operating conditions of the energy device, The optimization unit comprises: a cost optimization unit that calculates operating conditions of the energy equipment based on an evaluation of the total energy operating cost of the ironworks; A CO2 optimization unit that calculates operating conditions of the energy equipment based on an evaluation of the total CO2 emissions from energy operations of the ironworks; and The CO2 cost evaluation unit calculates a CO2 cost index in the energy operation of the iron and steel plant based on the total energy operation cost of the iron and steel plant calculated by the cost optimization unit and the total CO2 emission from the energy operation calculated by the CO2 optimization unit.

10. A display terminal device which, together with an information processing device, constitutes an energy operation support system in an ironworks, wherein: The display terminal device obtains: the operating conditions of the energy equipment and the total energy operation cost calculated by the cost optimization unit of the information processing device based on the evaluation of the total energy operation cost of the steelworks; The operating conditions of the energy equipment and the total CO2 emissions from energy operation calculated in the CO2 optimization unit of the information processing device based on the evaluation of the total CO2 emissions from energy operation of the iron and steel plant; and the CO2 cost index calculated in the CO2 cost evaluation unit of the information processing device, The display terminal device displays the energy utilization information of the ironworks including the total energy utilization cost, the total CO 2 emission from energy utilization, and the CO 2 cost index.

11. Energy utilization support methods for ironworks, including: An information acquisition step, wherein an information acquisition unit of an information processing device acquires information related to energy services of each plant constituting the steelworks and information related to an operation plan of energy equipment in the steelworks; an optimization step, wherein the optimization unit of the information processing device calculates the operating conditions of the energy device; an output step, wherein an output unit of the information processing device outputs the information calculated in the optimization step including the operating conditions of the energy equipment; and The information display step is performed by using a display terminal device, The optimization step comprises: a cost optimization step of calculating the operating conditions of the energy equipment based on the evaluation of the total cost of energy operation of the ironworks; A CO2 optimization step of calculating the operating conditions of the energy equipment based on an evaluation of the total CO2 emissions from the energy operation of the ironworks; and a CO2 cost evaluation step, calculating a CO2 cost index in the energy operation of the ironworks based on the total energy operation cost of the ironworks calculated in the cost optimization step and the total CO2 emission from the energy operation calculated in the CO2 optimization step, The information display step displays the energy utilization information of the ironworks including the total energy utilization cost, the total CO 2 emission from energy utilization, and the CO 2 cost index.

12. A method of operating an ironworks, wherein: Based on the energy utilization information of the ironworks displayed by the display terminal device of the energy utilization support system according to claim 1, the operating conditions of the ironworks are changed.

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