JPS63259004A - Method for operating energy in iron making plant - Google Patents

Abstract

PURPOSE:To effectively adjust consumption of many kinds of byproducing gases by calculating supplying rate of the byproducing gas for supplying to an electric power plant by mixed integer programming based on many kinds of conditions in an informa tion processor. CONSTITUTION:In the information processor 30, an energy planning ion an iron making plant in the prescribed time from now expressed by unit time based on a production control and production planning in the iron making plant, is executed by calculating the supplying rate of the byproducing gas for supplying to the electric power plant 14 by using integer programming while using restricting condition for energy consump tion in the power plant 14, permissible variation to gas holders 16A, 16B, 16C storing and discharging the many kinds of byproducing gases, and the min. purchasing fuel in the power plant 14, the min. number of exchanging time of exclusive burning of the byproducing gas and mixed burning of the byproducing gas and purchased fuel and the min. excess/shortage of the excess gas of the byproducing gas in the iron making plant under restricting condition of the power plant operation and the purchas ing energy use, as objective functions. Next, in accordance with this supplying pattern, the supply of the byproducing gas to the power plant 14 is controlled, and the demand operation for the gas energy is executed.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an energy management method for a steelworks, and in particular, the present invention relates to an energy management method for a steelworks, and in particular, the combustion of by-product gas generated within the steelworks in an ironmaking/steelmaking steelworks equipped with gas generation equipment such as a coke oven, a blast furnace, and a converter. For example, we aim to improve the efficiency of energy operation and i-tracing operation between a joint thermal power plant or private power plant established with an electric power company and a factory that uses gas energy consumed within a steelworks. This invention relates to an energy management method suitable for use in steel works.

[Conventional technology]

Generally, in ironmaking and steelmaking plants, energy centers monitor and manage various types of energy.
Efforts are being made to rationalize energy use within the steelworks. In particular, in ironworks that have large-scale power plants, the consumption of various by-product gases such as coke oven gas, blast furnace gas, and converter gas is adjusted at the large-scale power plants. By the way, at each factory in the WL area as mentioned above,
Energy generation according to each production schedule,
Since iPf costs are used, it is difficult to grasp the overall amount of energy, and there is a problem that energy loss and economic burden increase due to the dissipation of by-product gas or the purchase of more electricity than the customer's contract. In order to deal with these problems and to rationalize and improve the efficiency of energy use, the applicant of the present application previously published Japanese Patent Application Laid-Open No. 61-217689.
In this issue, we propose an energy operation control method for steelworks. In this vIpH method, the energy usage plan for each unit time is created at predetermined time intervals based on production plan information, and the short-term energy usage plan is adjusted by 71fi in units of several minutes according to past operational results. In conjunction with the utilization plan, determine and operate the level transition of gas holders for stockpiling various gases and the principle of in-house power generation so that the amount of waste electricity and waste gas is minimized based on the long-term and short-term advance plan. It is characterized by Furthermore, Japanese Patent Laid-Open No. 52-184165 discloses an energy control method in a steel penetrating process. In this control method, the main task is to determine the blast furnace operation pattern in order to plan a long-term (1″f4 period to 1 month) loss and loss plan. Using the minimum amount of consumption as an objective function, calculate the appropriate energy distribution pattern in the pig metal hole process, select the optimal energy distribution pattern from the calculated appropriate energy distribution patterns according to the preset selection criteria, and It is characterized by allocating energy to the steel-through process according to patterns and controlling energy supply and demand.This control method is mainly used to minimize or optimize the energy used in the steelworks, mainly in the blast furnace, or to minimize the amount of specific energy used. By the way, large-scale power plants that use boilers that are capable of co-firing by-product gas generated at steel plants and purchased fuel, such as heavy oil (hereinafter, heavy oil will be explained using heavy oil as an example of purchased fuel). For example, in a joint thermal power plant, in order to reduce power generation costs, the amount of expensive heavy oil used is reduced as much as possible, and the specified output is obtained by burning only the various by-product gases generated in the steel works as described above. Generally speaking, it is not possible to reduce the amount of heavy oil in such boilers as much as possible;
When burning heavy oil, it is necessary to flow the heavy oil at a certain minimum flow rate (hereinafter referred to as minimum heavy oil). Also, combustion of gas only (
When switching between two combustion modes: gas-only combustion (hereinafter referred to as gas-only combustion) and combustion with gas and heavy oil (hereinafter referred to as mixed combustion),
It is necessary to install and remove burners for heavy oil, which requires a large amount of man-hours and time, so once gas-only combustion has started, it is desirable to continue the same combustion mode for as long as possible. It is desirable to reduce the amount of heavy oil that is burned and ultimately reduce the amount of combustion to zero, but in order to do so, it is necessary to send an extra amount of by-product gas into the boiler that corresponds to the calorific value of the heavy oil. No. In other words, if gas equivalent to minimum heavy oil can be secured (in general, in large-scale power plants attached to steelworks, coke oven gas (COG), which has a particularly high calorie content, is qualified to specifically replace heavy oil), Gas-only combustion becomes possible by stopping the inflow of heavy oil, and if this cannot be ensured, co-fired gas must be used. Therefore, when determining the amount of gas supplied to a large-scale power plant, a coke oven that can replace the above-mentioned minimum heavy oil is recommended. The most important conditions are whether gas COG can be secured and how long the amount can be secured continuously. In this case, the basis for determining the gas supply amount is the balance of each gas generated within the steelworks, that is, how the amounts of each gas generated in the six furnaces and used in each factory will be after the fact. This is data to see how things will change.

[What does the invention try to solve? TIQ point] However, since each factory within a steelworks generates and consumes energy according to its own production schedule, it is difficult to grasp the overall gas balance. Therefore, it is difficult to grasp the overall gas balance. In order to determine the undervalued value,
If you are unable to stop the supply of purchased fuel, you may start co-firing, or you may unnecessarily change the level of the gas holder due to over-planning, or you may immediately cancel gas-only combustion once started. There are problems in that the switching work requires a large amount of work time and reduces efficiency. In addition, as a technology related to the present invention, Japanese Patent Application Laid-Open No. 54-133
There is a gas supply and demand system proposed in 401 that adjusts the amount of gas supplied to the power plant so as to keep the gas level in the gas holder constant. In contrast, the present invention
This method does not take into consideration the level of the gas holder to be constant, but rather uses the gas holder effectively at a level within a certain flill, and allows for fluctuations in the level of the gas holder. In other words, the system is different in that the entire system including the amount of gas supplied to the power plant is optimized, and the level of the gas holder is determined by the result, and optimization is performed from a broader standpoint than the gas supply/demand control system. It is something to do.

[Object of the Invention] The present invention has been made to solve the above-mentioned conventional problems, and is to effectively utilize gas holders based on the gas balance calculated from the production information of each factory in the steelworks. By managing the energy of by-product gas, we have developed an energy management method for steelworks that can reduce by-product gas dissipation, reduce the amount of input fuel used, and reduce the frequency of switching between gas-only combustion and mixed combustion. The purpose is to provide. [Means for Solving the Problems] The present invention provides a power plant that obtains electric power by burning at least one of by-product gas and purchased fuel from each gas generation facility, and an effective use of the by-product gas. In order to achieve this, various gas holders are used to stockpile by-product gas when there is surplus, and to release the stored by-product gas when there is no surplus, and based on the production management and production plan within the steelworks described below. In the steelworks energy operation method, the steelworks is equipped with a W information processing device that performs detailed information processing, and the information processing device controls the supply of byproduct gas to the power plant. The energy supply and demand plan within the steelworks up to a predetermined time expressed in units of time based on the planning sheath layer is calculated based on the energy usage constraints of the power plant, fluctuations allowed in the gas holder, power plant operation constraints, and purchased energy usage constraints. Under the conditions, the objective function is to minimize the amount of purchased fuel at the power plant, the minimum number of switching between exclusive combustion of byproduct gas and mixed combustion of byproduct gas and purchased fuel, and the minimum excess or deficiency of surplus byproduct gas in the steelworks. , by calculating the amount of by-product gas supplied to the power plant using mixed integer programming, and controlling the supply of by-product gas to the power plant according to the supply pattern of the calculated amount of by-product gas supplied. The above objectives are achieved by managing energy supply and demand.

[Effect]

Hereinafter, the present invention will be explained based on, for example, an ironmaking/steelmaking-through steel mill having a schematic configuration as shown in FIG. 1, for example. In addition, necessary symbols are written in the figure. In the figure, coke oven gas (denoted as COG in the figure) generated from a coke oven 10 is used in a factory 12A, and this surplus gas FCR is supplied to a communal thermal power plant 14. A gas holder 16A is provided in the middle of this feed line as a buffer for balancing the generation, use, and feed of coke oven gas. Incidentally, the blast furnace gas from the blast furnace 18 (denoted as BFG in the diagram) and the converter gas from the converter 20 (denoted as LDG in the diagram) are also used in the respective usage factories 12B and 12C in the same way as the coke oven gas. It is supplied to the large-scale power plant 14 via 16B and 16C. In addition, although converter gas is sometimes used as a single gas (single gas), it is often used as a mixed gas (denoted as MG in the figure) mixed with coke oven gas, and the above-mentioned steel manufacturing In some places, as shown in the figure, the mixed gas is mixed with coke oven gas in a pipe and supplied. Furthermore, the amount of surplus gas generated and used by each furnace (
The unit is Nn3/H) is the amount of surplus gas flowing into the gas holders 16A to 16C from each of FCR, FBR5 and FMR1 (
The unit is Nra'/H) and the large-scale power plant supply amount of surplus gas for each of FCH, FBH, and FMH1 (the unit is Nra3/H).
H) for FCK, FBK, FMK, each gas holder 16
A to 16C rubel (unit: N11) to VC, VB, VM
shall be. Since the amount of each of these gases is a variable whose value changes from moment to moment due to changes in generation, use, and supply, originally, time t is used to calculate FOR(t >, FBR <

[), ... should be written, but they are omitted in the figure. In the following description, the notification time unit ΔT of one supply amount is referred to as a "period", and for example, FOR(t) means coke oven surplus gas 1FcR in the time period of the period. . Also, it is assumed that each variable related to the flow rate is constant during this time period, and if it is not constant, it is interpreted that the average value for this time period is used. Furthermore, Holderehel Vc (
t ), VB (t ), and VM (t ) indicate the values at the final time of the second period. Further, each gas is supplied through the pipe in the direction of the arrow in the figure. Based on the above premise, the relationship between the variables related to each gas mentioned above is described in a mathematical formula, and the mixed integer programming method is applied based on the described formula, and each period is notified to the final large-scale power plant 14. Gas supply amount FCK (t), FBK (t >
, FMK (t), t = 1°2, . . . Obtaining T as a solution is considered as follows, where T is the number of periods considered. First, each gas holder 16A
The following equations (1) to (3) hold regarding the gas holding amount of ~16C. VC(t) = VC(t-1> +ΔT-FCH(t)...(1) VB(t) =VB(t-1)+ΔT-FBH
(t)...(2) VM (t) = VM (t-1)+ΔT-FMH
(t)...(3) However, t=1.2.・'..., takes the value of T. In addition, the initial condition and the terminal condition are the following equations (4) and (5)%.Furthermore, the upper and lower limit degree constraints of the gas holders 16A to 16C are given by the following equations (6) to (8). Zhuknee VC-(t)≦VC(t) ≦vc+vc◆(t) -(6) Zhudan-VB-
(t)≦VB (t)≦VB+VB order (t)
-(7)yヱVM-(t)≦VM(t)≦VM+VM◆(t) ・ (8) However, t
=1.2. ..., takes the value of T. Also, 纺dan, 纺dan, 竺ヱ; lower operating limit value of each gas holder, VC, VB, VM
; Operational upper limit value of each gas holder, VC-, VB-, VM''
″: An amount below the operating lower limit value of each gas, VC+, VB+, VM+: An amount exceeding the operating upper limit value of each gas (ruri!1 t). On the other hand, each gas supply amount FCK (t), FBK (t
) and FMK (t) are expressed by the following equations (9) to (11) from the relationship of the piping as shown in the figure. FCK (t) =FCR<t) -FCH<t
)...(9) FBK (t) =FBR(t) -FBH(t
)・−(10) FMK (t”) = FMR(t) −FMH(t
)・−(11) However, t=1.2. ..., takes the value of T. In addition, each of the above gas supply amounts FCK (t), FBK (t
>, the upper and lower limits of FMK (t) are expressed by the following formula (%). However, t takes a value of 1.2, . . . , T. Also, FCK
, FBK, FMK, the lower limit and limit value of the supply amount of each gas. Next, in order to express the effect of gas-only combustion in the boiler of the large-scale power plant 14, we will explain the amount of each gas supplied FCK (t)
, FBK (t), and FMK (t) are formulated. In this case, the number of boilers may be any number, but in order to avoid complication in notation, the number of boilers will be described as, for example, three boilers below. Then, variables that can take only the value O or 1 (0-1 variables) nl(j), rl2(i), r
l 3 (j) is defined as in the following equations (15) to (20). FCK (t)≧FCK' −*n + (j)
=1...(15)FCKN)<FCK'-n+(j)=0・
...(16) FCK (t) = FCK2-n 2 (t) =
1...(17) FCK (t) <FCK2-=n 2 (t)
=0...(18) FCK(t)≧FCK3-n3N)=1...
・(19) FCK (t) <FCK3-=n 3 (t)
=0... (20) However, t =1.2. ..., takes the value of T. or,
FCK', FCK2, and FCK3 are the coke oven gases required to burn boilers 1, 2, and 3, respectively. Naturally, FCK'<FCK2<
It becomes FCK3. In addition, the gas-only combustion multiple n(t) in the second period can be calculated using the following formula 〈2
Define as in 1). n (t)=nt (t)+12(t)+n3(t)
...(21) However, t = 1.2. ..., takes the value of T. Furthermore, the following equation (22) is introduced in order to describe the time change of the gas exclusive combustion multiple n(t). n(t)=n(t-1)+n
Medium (1)-m-(t)...(
22) However, t=1.2. ..., takes the value of T. Also, m(t) is a non-negative integer, and n(t)>n(t-
1), the increment when 1-(t) is a non-fL integer and n(t)<n(
This is the decrease when t-1>. From the above formula, each gas supply 1FcK (t), FB
Two objective functions that should maximize K (t ) and FMK (t ) are given as in the following equation (23). Z7=r, ΔTΣn(t) Town l +r4±VM order (t)) f mur - (r5ΣVC-<t) +r, positive VB-(t) (cl +r) ΣVM -(t)) E1 -r ,Σμ(t)l−(t)...(23)f,
1 Here, the meaning of each coefficient in equation (23) is as follows. rl; Profit per can from gas-only combustion, r2, r3-r
l: Loss due to dissipation of each gas COG, BFG, MG, r5, r6, ``7: Loss due to gas shortage of each gas COG, BFG, MG, ra: Gas exclusive combustion could not be continued for at least 2 periods'' Loss when truncating, μ(t): is a function that is 1 when the following equation (24) holds and is O otherwise. In m (t-1>>O or rm-(t-1)>0...
...(24) Also, the previous equations (9) to (11) are applied to each gas holder 16A to 1.
Gas flow personnel to 6C FCH(t>, FBH(t l F
By solving for each of MH(t) and substituting into equations (1) to (3), the inflow amount FC for each of these gas holders can be calculated.
H(t), FBI(t), and FMH(t) can be eliminated. In order to facilitate understanding of the calculation results of the above problem, the state vector of the target system is defined below. In this case, y(t) is the gas holder level, v(t) is the gas-only combustion change multiple, η(t) is the number of boilers in operation,
μ(t) is defined as the amount of gas supplied to the large-scale power plant, and ξ(1) is defined as the amount of gas shortage released by the gas holder. Therefore, the above problem can be expressed as follows. That is, in order to maximize the two objective functions, the following equation (26) should hold true. max Z = Σ[a −v (t−1>' ・v(t) 10ξ′・
ξ(t)+cη'・77(t)]...(26) However, a, Cξ, and Cη are constant vectors determined by formulas (23) and (24), and r' attached to these vectors etc.
” symbol represents the transposition of a vector. Also, t is 1,
2. ..., take the value of T. Also, formulas (1) to (3) and formula (22) can be converted to (25A) to (2
When expressed using the notation method of equation 5E), the state transition equation becomes as shown in the following equation (27). This state B iTl transfer equation is
t, represents the relationship between the state V(t-1) in the -1 period and the state y(t) in the 1st period. V (t)=l (t-1> 10 BtJ
(t)+,AV(t)+S(t)−(
27) However, A, B are constant matrices determined from equations (1) to (3) and (22), and are the matrices expressed by. The set of executable lrg regions Ft determined by formulas (6) to (8) and (12) to (14) is expressed by the following formula%, where t is 1, 2, . ..., takes the value of T. Furthermore, the initial value y(0) and the final value y(T) of the gas holder level y(t) can be expressed as in the following equations (29) and (30). V(0)=V'...(29)V(
T)=yT...(30) In the above problems (26) to (30), continuous variables and integer variables coexist, and the state vectors of two adjacent periods are related to each other by equation (27). It can be said that this is a decision-making problem during the winter period. Solutions to these kinds of problems have already been prepared, for example, in the Proceedings of the Society of Instrument and Control Engineers, Vol. 18, No. It can be solved by using the method described in "Optimization of a system in which i number groups are bonded". As explained above, according to the present invention, the gas balance is calculated and determined from the production information of each factory in the steelworks, and the gas balance is calculated and determined to dissipate by-product gas, reduce the amount of scrap fuel used, and switch between single combustion and mixed combustion of gas. 1f! It is possible to reliably reduce the i frequency. Therefore, when looking at the steelworks and the power plant as a whole, it is possible to reduce the fuel cost by reducing the amount of purchased fuel, prevent the dispersion of by-product gases, and reduce the frequency of boiler combustion mode switching, thereby shortening the working time. [Example] An example employing the method of the present invention will be described in detail based on FIG. 1 mentioned above. In this embodiment, the steel plant is an integrated steel plant with an annual production capacity of 12 million tons, and the large-scale thermal power plant is a joint thermal power plant. As shown in the figure, each gas holder 16A to 1 of the steelworks
6C indicates the gas level VC5VB, V in each gas holder.
Level meter 26A~ for detecting M (Nn'')
26C is provided. Moreover, each gas holder 16A-1
Each gas supply amount FCK, FBK, FMK is on the downstream side of 6C.
Meteor meters 28A to 28C are provided for detecting. Furthermore, in the figure, 30 is an information processing device. This information processing device 30 includes each gas holder 16A to 16C.
Boulder level VC, VB, VM (Nn3) within, the supply amount of each gas to the joint thermal power plant 14 FCK, FBK, F
Input the MK, process signals, gas balance prediction calculation results from the host information processing computer, gas generation amount, gas usage amount at each factory, and gas-fired boiler multiple signals, and input the signals downstream of each gas holder 16A to 16C. The opening degree of the flow control valves 32A to 32C provided on the side is controlled by the result of arithmetic processing of the input signal, and each gas supply amount FCK, FBK, and FMK to the communal thermal power plant 14 is controlled by 1t111. It is. Each gas generating group COG input to the information processing device 30
, BFG, LDG, and MG are predicted based on the production volume, operating status, production efficiency, etc. of each facility, and gas consumption is calculated based on the production volume, production efficiency, etc. of each factory 12A to 12C. At the same time, the surplus gas groups FOR, FBR, and FMR are also calculated. The gas balance between the amount of gas generated and the amount of gas used is predicted and calculated from the production plan by a higher-level information processing computer that measures the production plan of the entire steelworks in the long term, and is input to the information processing device 30. On the other hand, periodically (1 to 24 hours), the predicted value and the measured value are compared moment by moment and corrected as necessary. Then, the amount of heat required for the operating factory is determined from the gas usage amount per unit time and the operating capacity status, and the information processing device 30
Enter. As described above, the calculated or determined gas generation, tcOG, BFG, MG, and each gas usage amount are input to the information processing device 30, and at the same time, the amount of each gas supplied to the communal thermal power plant 14 is inputted. FcK, FBK, and FMK are measured and input every moment. Further, the information processing device 30 is constantly inputted with the operational boiler multiple of the communal thermal power plant 14, especially the gas-fired boiler multiple, and further with each gas holder level VC.
, VB, and VM are assumed to be current values and are input to be used as initial values for optimization calculations. And gas supply 1FcK, FBK, FMK to joint thermal power plant 14 is as follows:
From the difference between various surplus gases and various gas holder amounts (9)
~(11) Based on the various input management information as described above, the information processing device 30 determines the energy supply and demand amount using the mixed integer programming method so that the above-mentioned equation (26) holds, and transmits the energy to the communal thermal power plant 14. Calculate the amount of by-product gas supplied. Then, the information processing device 30 adjusts each gas flow rate with each gas flow rate control valve 32A, 32B, and 32C so that the gas supply amount to the communal thermal power plant 14 becomes the calculated supply amount. Optimal operation of Next, the results of energy management in a pig iron making/steel making plant using the present invention will be explained using specific numerical values. That is, the amount of gas to be fed to the communal thermal power plant 14 is determined every two hours, and this determined value is calculated based on the amount of gas to be supplied to the joint thermal power plant 14 for two hours from one hour ahead. This was done by informing the communal thermal power plant 14 of the generated amount. For example, at 12 o'clock, the value for two hours from 13 o'clock to 15 o'clock is communicated. That is, the calculation time unit ΔT=2. Each gas COG, BFG, MG is used at each factory 12A to 12
The surplus gas FCR(t), FBR(t
), each gas holder 16A for storing FMR(t) ~
The capacity of 16C is 140,000 m3200,000 II', 1
It was 0,013. Furthermore, the minimum required coke oven gas λ to replace heavy oil was 1200ONn+3/H, and three boilers were used. Furthermore, the period targeted for calculation was 8 hours for 4 periods (T = 4). The planned values of surplus gas FCR(t), FBR(t)
, FMR(t) was created on an hourly basis by the above-mentioned host information processing computer, and the received scheduled value was converted into a two-hour average value for the period of calculation eI. Based on the above assumptions, the calculation of the gas supply amount is 2
This was done by calculating the series of supply values from the notification time to the previous four periods based on the latest total M value at each notification time. Then, only the most recent result in the calculated series was used as the determined value of the gas supply amount at the calculation time and communicated to the communal thermal power plant 14. An example of the temporal sequence of the determined value of the gas supply amount calculated as described above is not shown in FIG. 2, and t=i to 4 in the figure represent each period. In addition, each gas holder 1 changes in each period when each gas is supplied to the communal thermal power plant 14 at the determined values shown in FIG.
6A to 16C level VC, VB, VM (Nllll
”) is shown in Fig. 3. From Fig. 3, the level VC of the gas holder 16A exceeds 36000 (Nn ”) during the 8 hours of the 4th period.
Therefore, it is understood that there is no need to use heavy oil, and there is no emission. Furthermore, the following table shows an example of the results of one month of saving work at a steelworks and a communal thermal power plant using the method of the present invention and the conventional method.This table also shows that the frequency of switching of heavy oil co-firing has decreased, and the switching work has been reduced. It is understood that highly efficient and appropriate energy management can be achieved because the time is reduced, the ratio of heavy oil usage is reduced, and the amount of gas released is also reduced. The overall effect of such optimization of energy management is expected to be several hundred million yen annually. Table 1 Note that in the above embodiments, a large-scale communal thermal power plant is not shown as an example of a power plant according to the present invention. However, whether a power plant is large-scale or not is determined by the relative relationship between the amount of byproduct gas generated from the WIa plant and the byproduct gas l consumed in the power plant. Therefore, the power plant is not limited to a large-scale communal thermal power plant, but can include a normal communal thermal power plant and other power plants, such as a large private power plant in a steel mill, a gas turbine power plant, and the like. Further, in the above embodiments, heavy oil was exemplified as the purchased fuel, but the purchased fuel is not limited to heavy oil, and other fuels such as liquefied natural gas (LNG gas), LPG gas, naphtha, etc. can be used. , these gases can be co-combusted with by-product gases. Furthermore, in the above embodiments, an example was explained in which the method of the present invention was implemented in a steelworks with a configuration as shown in FIG. The method of the present invention is not limited to the iron-making/steel-making steelworks having the configuration shown in , but can be implemented in other steelworks with other configurations or various gas generation facilities and thermal power plants.

【Effect of the invention】

As explained above, according to the present invention, the gas holder is effectively used to utilize the energy of the by-product gas with the gas balance determined from the production information of each plant in the ironworks. It is possible to reliably reduce the amount of gas used, reduce the amount of purchased fuel used, and reduce the frequency of switching between gas combustion and mixed combustion. Therefore, when looking at steelworks and power plants as a whole, it is possible to reduce fuel costs by reducing purchased fuel, prevent the dissipation of by-product gases, and shorten work time by reducing the frequency of boiler combustion mode switching. Excellent effects can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram including a partial block diagram showing an example of an iron-making/steel-making ftM pigeonhole for explaining the present invention, and Fig. 2 is a schematic configuration diagram including a partial block diagram showing an example of an iron-making/steel-making ftM ironworks. Similarly, FIG. 3 is a diagram showing an example of the determined value of each gas supply amount, and is a diagram showing an example of the level transition of the gas holder. 10... Coke oven, 12A to 12C... Factory used, 14... Community thermal power (large scale) power plant, 16A to 16C
... Gas holder, 18... Blast furnace, 20... Converter, 26A-26C... Level meter, 28A-28C... Flow meter, 30... Information processing device, 32A-32C... Flow rate control valve, COG...Coke oven gas, BFG...Blast furnace gas, MG...Mixed gas.

Claims (1)

[Claims] (1) A power plant that generates electricity by burning at least one of the by-product gas and purchased fuel from each gas generation facility, and when there is enough by-product gas to effectively utilize the by-product gas. Equipped with various gas holders that store the by-product gas and discharge the stored by-product gas when there is not enough room, and an information processing device that performs information processing based on the production management and production plan in the steelworks described later. In a steelworks energy operation method for controlling the supply of byproduct gas to the power plant in a steelworks, the information processing device is configured to perform the following steps: The energy supply and demand plan within the steelworks is calculated based on the power plant's energy usage constraints, fluctuations allowed in the gas holder, power plant operation constraints, and purchased energy usage constraints, such as minimum purchased fuel for the power plant, minimum amount of by-product gas, etc. The objective function is to minimize the number of switching between exclusive combustion and mixed combustion of by-product gas and purchased fuel, and to minimize the excess or deficiency of surplus by-product gas in the steelworks. The gas energy supply and demand operation is performed by calculating the raw gas supply amount, and controlling the supply of the byproduct gas to the power plant according to the supply pattern of the calculated byproduct gas supply amount. How to use energy at a steelworks.