JP4738186B2 - Method for selecting power generation coal type and power generation coal type selection program - Google Patents

Description

    The present invention provides a power generation company for providing power to a market when generating a purchase plan for coal for power generation to be used for power generation at a thermal power plant from the economical viewpoint. The present invention relates to a method for selecting a coal type and a program for selecting a coal type for power generation.

Up to now, power has been supplied from one power generation company in each region, from power generation to transmission and sales. Under these circumstances, reforms aimed at correcting the high cost structure, including deregulation, are being promoted in various fields with the aim of restoring international competitiveness. The introduction of a new power supply system has been promoted. Therefore, for example, since March 2000, the liberalization of power retail has been realized in the form of partial liberalization.
Power generation companies have been working to reduce costs from various points, such as improving business efficiency, in order to supply low-cost electric power. In order to respond to the expansion of business, it is necessary to realize further reduction of management costs.

Therefore, for example, in “Optimum operation plan calculation method and apparatus for power generation facilities” described in Patent Document 1, a power generation business entity (power generation business operator) predicts prices in each power market, and various power generation facilities and power transmission facilities. In view of the above technical restrictions, an invention has been made for providing a method and an apparatus for preparing an optimum operation plan for obtaining the maximum profit by selling power. If the object of the present invention is actually achieved, it seems that it is possible to reduce electricity charges to some extent by enhancing the competitiveness of power producers.
JP 2001-86645 A

  Purchases of coal, oil, LNG, etc., which are fuels for power generation, account for a large percentage of the power generation company's expenditure. In general, the purchase of fuel for power generation so far has selected the fuel with the lowest unit price per unit calorific value in consideration of the calorific value of the fuel and the transportation cost. The invention described in Patent Document 1 also describes the use of a fluctuating fuel price as a data function for calculating a predicted power price.

  However, even if you purchase a fuel for power generation that is cheap considering the calorific value of the fuel and transportation costs, the total cost per unit power generation will be less if you take into account the ash processing costs and pollution processing costs generated by power generation. It may be expensive. Therefore, it is impossible to select the cheapest fuel as a whole without considering the purchase of fuel for power generation in consideration of such processing costs.

Coal is abundant in the world and has been re-recognized as a fuel for power generation, coupled with the growing concern about nuclear power that was expected to be a powerful alternative to the impending oil shortage. It has been positioned as the main energy source corresponding to the new energy situation. On the other hand, it is necessary to make every effort to remove sulfur oxides, nitrogen oxides, dust, etc. generated during coal combustion and to treat coal ash.
For example, coal typically contains about 5 to 25% ash, and coal ash is generated in an amount of 10 to 20% even from a fairly high quality coal, and in a low quality coal. Since more than 24.5 million tons of coal is used for thermal power generation annually, more than 4 million tons of coal ash is generated. It is extremely important that the coal ash be disposed of at low cost in compliance with the law. Become. In addition, other emissions are generated in large quantities, and the processing costs are enormous.
On the other hand, coal ash and gypsum emissions may be effectively used as raw materials for cement and gypsum board. In such cases, the cost per unit power generation is reduced by these sales profits (resource utilization revenue). Will be. Furthermore, when considering the effect of dilution of the substance to be treated, it may be advantageous to purchase a fuel with a high ash content.
As described above, it is not enough to select a fuel with the lowest unit price per unit calorific value, based on the calorific value of fuel and transportation costs, as in the conventional plan for purchasing coal for power generation. Without taking into account the negative and positive effects of emissions such as ash, a truly optimal fuel purchase plan cannot be made.

  Coal, which is a fuel for power generation, is often used as a blend of several types of coal, but the characteristics of coal vary greatly depending on the country of origin. Until now, however, there has been a system that comprehensively manages the concentration of processing target substances contained in the generated ash and the processing costs in addition to coal purchase costs and transportation costs per unit calorific value. Because it did not exist, generators could not optimize the plan for purchasing coal for power generation to maximize profits.

The present invention has been made to solve such problems, and not only the cost per calorific value of fuel and the transportation cost but also the processing cost of the waste, etc. when making a purchase plan for coal for power generation. Comprehensively, a method for selecting a coal type for power generation that supports the selection of the coal with the lowest unit price per unit power generation and a program for selecting a coal type for power generation for causing a computer to execute this method The purpose is to provide.
This method of selecting the coal type for power generation and the program for selecting the coal type for power generation function most effectively when generating power by burning coal blended with coal with different coal characteristics depending on the country of origin. is there.

In order to achieve the above object, the method for selecting a coal type for power generation according to claim 1 is a method for selecting a coal type for power generation to support optimization of a purchase plan of coal as a fuel for power generation in a thermal power plant. The coal used is a mixture of different types of coal. The purchase and transport cost calculation stage for calculating the purchase cost of coal and the transport cost of the coal required for the desired power generation amount, and burning the coal Calculate the amount of various coal ash, wastewater, sludge, gypsum, exhaust gas, and other emissions generated by the process, and the concentration of each substance to be treated that requires pretreatment before disposal. A processing substance calculation stage to calculate the value, a revenue calculation stage to calculate resource utilization revenue obtained by effectively using the generated waste as a resource, and discarding each emission that could not be effectively used as a resource The A processing cost calculation step of calculating a processing cost of the purchase price, transportation cost, to calculate the resource usage revenues and disposal costs, coal types of coal purchased such that the total cost is cheaper required per unit power generation and And a coal type determination step of determining the mixing ratio and displaying the mixture ratio in ascending order .

The method for selecting a coal type for power generation according to claim 2 further includes an environmental tax calculation step of calculating a tax amount of an environmental tax imposed upon burning the coal, and the taxable amount is determined in the coal type determination step. The type of coal to be purchased is determined in the calculation.

The method for selecting a coal type for power generation according to claim 3 is characterized in that the various types of coal ash are clinker ash collected near the boiler, cinder ash collected near the boiler outlet, and EP that is electrostatically collected. It is characterized by being ash.

In order to achieve the above object, the power generation coal type selection program according to claim 4 is a power generation coal type selection program for supporting optimization of a purchase plan of coal as power generation fuel of a thermal power plant. The coal used is a mixture of different types of coal. The purchase and transport cost calculation stage for calculating the purchase cost of coal and the transport cost of the coal required for the desired power generation amount, and burning the coal Calculate the amount of various coal ash, wastewater, sludge, gypsum, exhaust gas, and other emissions generated by the process, and the concentration of each substance to be treated that requires pretreatment before disposal. Processing substance calculation stage to calculate the amount of waste, revenue calculation stage to calculate resource utilization revenue obtained by effectively using the generated waste as a resource, and each emission that could not be effectively used as a resource A processing cost calculation step of calculating a processing cost required for disposal, the purchase costs, transportation costs, to calculate the resource usage revenue and treatment costs, coal purchasing such that the total cost is cheaper required per unit power generation amount It is characterized by having a computer execute a coal type determination step of determining a coal type and its mixture ratio and displaying them in ascending order .

According to the invention described in claim 1 or 4 , not only the calorific value and transportation cost of coal as a fuel, but also various coal ash, waste water, sludge, exhaust gas, etc. In addition to calculating the amount of waste generated, and calculating the concentration of processing target substances in the generated waste, and then calculating the processing costs required for waste processing, from the comprehensive judgment of purchase / transportation costs and processing costs It will be possible to select the coal with the lowest cost per unit power generation.
In addition, when using coal blended with several types of coal as a fuel for power generation, the amount of emissions generated from purchase and transportation costs, such as the purchase costs of several types of coal, and the characteristics of the types of coal. And
In addition, the cost of the unit price per unit of power generation is the lowest, taking into consideration the processing cost obtained from the concentration of the target substance contained in the waste and the resource utilization revenue from the sale of coal ash, etc. And combinations thereof can be determined. As a result, the power generation company can easily make a purchase plan for the fuel for power generation in order to obtain the maximum profit.

In addition to coal purchase and transportation costs and waste disposal costs, if you can sell various coal ash and gypsum as raw materials, or sell processed products using coal ash, etc. In addition, by taking into consideration the profits from sales (resource utilization profits), it becomes possible to select the coal with the lowest unit price per unit power generation based on these comprehensive judgments.

According to the invention described in claim 2 , it is possible to cope with future legal revisions by taking into account the environmental tax represented by the carbon tax that is being considered for the future in order to reduce the burden on the environment. In this way, it will be possible to select the coal with the lowest unit price per unit power generation.

According to the invention described in claim 3 , in addition to the EP ash that occupies about 80% of the generated coal ash, various types of coal ash are discarded for each of the clinker ash and the cinder ash that are separated and recovered. By calculating the costs for processing or the profits when these are effectively used, it is possible to select the coal with the lowest unit price per unit power generation more appropriately.

  FIG. 1 is a diagram schematically showing locations where coal ash, exhaust gas, and sludge are discharged in a coal-fired power plant. As shown in this figure, clinker ash is generated near the boiler, cinder ash is generated near the boiler outlet, and EP ash (fly ash) is collected from the front of the desulfurization facility. Gypsum is generated from the desulfurization facility, and sludge and discharged water (drainage) are generated from the wastewater treatment facility. Further, exhaust gas is emitted from the chimney.

Various trace components (substances to be treated) contained in coal are transferred to coal ash, waste water, and combustion gas by burning coal. Therefore, in the coal-fired power plant, the content concentration of the processing target substance contained in the coal ash is confirmed, and if it is less than the allowable concentration stipulated by the law, landfill processing is performed (primary processing).
If the concentration of the substance to be treated contained in the discharge is not less than the allowable concentration, the primary treatment is performed after the treatment for lowering the concentration. If you are unable to comply with laws and regulations even if you reduce the content concentration, you can bring it to a block-type disposal site and dispose of it so as not to adversely affect the surrounding environment (secondary processing).
In addition, gasified substances to be treated are mainly collected in an electrostatic precipitator, flue gas denitration device, and flue gas desulfurization device. Each occurs. About desulfurization waste water, a predetermined chemical process etc. are given with a waste water treatment equipment, and the density | concentration of a process target substance is made into an allowable density | concentration or less, and a water discharge disposal etc. are made. The gypsum generated from the equipment is reused as building materials.
Furthermore, in wastewater treatment equipment that treats the wastewater discharged from the facilities in the power plant, including the wastewater from the flue gas desulfurization equipment, prescribed chemical treatment to keep the concentration of trace components in the wastewater below the legally acceptable concentration However, wastewater sludge generated as a by-product of this treatment is handled in the same way as coal ash.

  FIG. 2 and FIG. 3 are diagrams showing the configuration of a power generation coal type selection apparatus in which a power generation coal type selection program for executing the power generation coal type selection method of the present invention is installed. This power generation coal type selection apparatus 10 includes an input unit 1 for inputting various data, an input processing unit 3 for processing input data, a data storage unit 5 for storing input data, A calculation unit 7 that performs calculation processing, an output control unit 11 that performs control processing for outputting various data to the output unit 119, and the like are provided.

The following data (1) to (11) are input from the input unit 1, and the data storage unit 5 stores them.
(1) Weight ratio of each type of coal necessary to obtain unit calorific value (unit calorific value coal weight table)
(2) Purchase cost for each type of coal per unit weight (Purchase cost table)
(3) Transportation cost for each coal type per unit weight (Transport cost table)
(4) Weight of each emission generated when each type of coal required to obtain unit calorific value is burned (Unit calorific value emission weight table)
(5) Concentration of processing target substances contained in each coal before combustion (processing target substance content concentration table)
(6) Transfer rate of each process target substance to each emission after burning each coal type (process target substance transfer rate table)
(7) Allowable concentration of substances to be treated in the discharge (allowable concentration table)
(8) Processing costs required for the primary treatment of each emission when the concentration of the substance to be treated in the emission is below the allowable concentration (primary treatment cost table)
(9) Processing costs required for secondary treatment of each emission when the concentration of the substance to be treated in the emission is above the allowable concentration (secondary treatment cost table)
(10) Amount of environmental tax for each type of coal taxed on unit weight (environmental tax table)
(11) Revenue per unit weight when using waste effectively (revenue amount table)

The calculation unit 7 of the power generation coal type selection device 10 calculates the purchase cost of coal, the transportation cost, the disposal cost of waste, the resource utilization profit of waste from the data 1 to 11 stored in the data storage unit 5. In consideration of the above, various arithmetic processes for selecting a single coal or a plurality of coals (mixed coals) with the lowest unit price per unit power generation amount are performed. When selecting the coal mixture, the calculation unit 7 obtains the selection of the coal type and the mixing ratio of each coal type by calculation.
FIG. 4 is a diagram illustrating a flow of data processing by the power generation coal type selection device 10 according to the present embodiment. Hereinafter, the method for selecting the coal type for power generation according to the present invention will be described with reference to this flowchart.

[Coal seed weight calculation stage (S1)]
This stage is a stage for obtaining the weight of each type of coal necessary for obtaining a predetermined calorific value when using a coal blend mainly as a fuel for coal-fired power generation.
The data storage unit 5 stores the weight of coal necessary for obtaining the unit calorific value (unit calorific value coal weight table) as described above, and the calculation unit 7 stores the unit calorific value coal weight table. In addition, when a coal mixture obtained by mixing several types of coal is used as a fuel for power generation, the weight of each coal type necessary to obtain a certain calorific value is calculated.
The table in FIG. 5 schematically shows the weights of other coal types necessary to obtain the same calorific value as when only the A coal type is burned by 100 weights. As can be seen from this table, when trying to obtain the same calorific value as the A type coal, which is a good quality coal type, the B type is 1.05 times, the C type is 1.1 times, and the n type is It can be seen that 1.5 times the weight of coal is required. FIG. 6 shows a list of weight ratios of other coal types mixed with the A coal type based on the calorific value in order to obtain a constant calorific value. As can be seen from this list, for example, in a mixed coal mixture of coal types A and n, if the calorie ratio is set to 5: 5, the coal type A needs 50 weights and the coal type A needs 75 weights. Thus, the total weight of the mixed coal is 125 weight.

[Purchase / Transport Cost Calculation Stage (S2)]
This stage is a stage for obtaining the total purchase cost and transportation cost of each coal type necessary for obtaining a predetermined calorific value.
The data storage unit 5 stores the purchase cost and the transport cost per unit weight of each coal type as described above. FIG. 7 is a data table integrally showing purchase costs and transportation costs. This table shows the purchase cost and transport cost of other coal types when the purchase cost and transport cost per unit weight of Coal A type are 100. The purchase cost and the transport cost input to this data table are appropriately rewritten by input from the input unit 1 corresponding to the change of the exchange rate or the cost itself.
The calculation unit 7 calculates the total of the purchase cost and the transportation cost from the weight of each coal type necessary for obtaining the predetermined calorific value calculated in the coal type weight calculation stage.

[Discharge weight calculation stage (S3)]
This stage is a stage for obtaining the weight of each emission generated when the coal mixture is burned to obtain a predetermined calorific value.
In the data storage unit 5, the generated weight (unit calorific value exhaust weight table) of each emission generated when each coal type necessary for obtaining the unit calorific value is burned as described above is input unit 1. Is input and stored. FIG. 8 shows the weight ratio of the generated coal ash to the weight before combustion for each coal type and the weight ratio of the coal ash generated as an example of the unit calorific value emission weight table for each coal type. In this table, the generated weight of coal ash of other coal types is shown when the generated weight of coal ash at the time of 100 wt.
The calculation unit 7 calculates the weight of each emission generated from the weight of each coal type necessary for obtaining the predetermined calorific value calculated in the coal type weight calculation stage.

[Processing substance calculation stage (S4)]
This stage is a stage for obtaining the concentration of the substance to be treated contained in each emission generated when the coal mixture is burned in order to obtain a predetermined calorific value.
As described above, the data storage unit 5 stores the concentration of the substance to be processed contained for each coal type. The content of substances subject to treatment varies greatly depending on the country of origin, and when these coals are used as coal for power generation, the amount of substances subject to treatment contained in emissions such as generated coal ash, wastewater, sludge, and exhaust gas. Naturally, the concentration will vary greatly.
Further, the data storage unit 5 stores a processing target substance transfer rate for calculating the concentration of the processing target substance that will be included in each emission when each coal type is burned individually for combustion. (Processed substance transfer rate table). The processing target substance transfer rate is obtained by dividing the processing target substance concentration in the effluent measured experimentally for each effluent by the processing target substance containing concentration.
For reference, FIG. 9 shows, as an example, the concentration of the substance to be treated that is included in each emission when the type A coal is burned.
The calculation unit 7 generates a coal mixture in which several types of coals are mixed at an appropriate ratio from the weight of each emission calculated in the emission weight calculation stage, the concentration of the substance to be processed and the transfer rate of the substance to be processed. When burned as coal, the concentration of the substance to be treated that will be included in each emission is determined by calculation.

[Primary processing cost calculation stage (S5)]
This stage is a stage for obtaining the cost required for the primary treatment for treating each of the generated emissions when the coal blend is burned to obtain a predetermined calorific value.
As described above, the data storage unit 5 stores an allowable concentration table (FIG. 10) that represents the allowable concentration of the substance to be processed prescribed by law. The allowable concentration defines the upper limit of the concentration of the substance to be treated in the effluent that can be reduced to the soil or released into the atmosphere.
The data storage unit 5 stores a processing cost required for primary processing of the discharge per unit weight for each discharge. FIG. 11 is a primary processing cost table that simulates the cost of the primary processing of each emission.
When the concentration of the processing target substance obtained in the processing target substance calculation stage is lower than the allowable concentration, the calculation unit 7 calculates the weight of each emission calculated in the emission weight calculation stage and the primary processing cost table, Find the total cost for the primary treatment of the waste.

[Secondary processing cost calculation stage (S6)]
This stage is a stage for obtaining the cost required for the secondary treatment for treating each effluent when the substance to be treated in each effluent exceeds the allowable concentration.
As described above, the data storage unit 5 stores the processing cost per unit weight required for the secondary processing for each emission. FIG. 12 is a secondary processing cost table showing the cost required for the secondary processing per unit weight of each emission. As can be seen from the table, the secondary treatment cost of the waste at the interception type disposal site is very expensive.
When the processing target substance in each effluent after the primary treatment exceeds the allowable concentration, the calculation unit 7 calculates the weight from the effluent weight calculated in the effluent weight calculation stage and the secondary treatment cost table. Find the total cost of secondary waste disposal.

[Environmental tax calculation stage (S7)]
This stage is a stage to calculate the amount of environmental tax represented by carbon tax.
The data storage unit 5 stores the amount of environmental tax (environmental tax table) taxed per unit weight of each coal type. The calculation unit 7 calculates the amount of environmental tax that is taxed from the weight of each coal type required for power generation obtained at the coal type weight calculation stage and the weight of each emission obtained at the emission weight calculation stage. Is calculated.

[Revenue calculation stage (S8)]
This stage is a stage for obtaining profits when various types of coal ash collected by a boiler or the like and gypsum collected by a desulfurization facility are effectively used.
The data storage unit 5 stores a profit per unit weight (revenue amount table) for each discharge when the discharge is effectively used. When there is a request from a cement producer or building material manufacturer to purchase coal ash or gypsum, or when a power producer uses coal ash on its own, input the amount and revenue per unit weight from the input unit 1 . The computing unit 7 calculates the total profit that can be obtained through effective use of coal ash and the like.

[Coal species determination stage (S9)]
This stage is a stage in which coal with the lowest unit price per unit power generation is selected from the sum of expenditures and revenues obtained in each of the above stages.
The arithmetic processing unit calculates the combination of the coal types that can obtain a predetermined calorific value and the mixing ratio thereof, and sums the purchase cost and the transportation cost of each coal type obtained in the purchase / transport cost calculation stage ( Expenditure) Primary processing cost (expenditure) calculated at the primary processing cost calculation stage, secondary processing cost (expense) calculated at the secondary processing cost calculation stage, and total amount of environmental tax calculated at the environmental tax calculation stage ( Expenditure), the combination of coal types and the mixing ratio of which the total of the amount of revenue (income) obtained in the revenue calculation stage is reduced, and the mixture ratio thereof are extracted, and the calculation result is sent to the output control unit 11, which outputs the output unit 119 Are displayed in ascending order of cost per unit power generation.

  As described above, when the method for selecting a coal for power generation according to the present invention is used, not only the cost per fuel calorific value and the transportation cost but also the processing cost of coal ash, etc. when planning the purchase of power generation coal. Judging comprehensively, the coal with the lowest unit price per unit power generation can be selected. Also, when using coal blend as a fuel for power generation, since optimum coal is comprehensively managed, it becomes possible to easily determine the optimum coal type, combination and mixing ratio.

  It should be noted that the present embodiment of the present invention is not limited to that described above, and can be appropriately changed without departing from the spirit of the invention.

  As described above, according to the power generation coal type selection method and the power generation coal type selection program of the present invention, it is possible to select the coal with the lowest unit price per unit power generation amount in consideration of the waste disposal costs and the like. . In particular, according to the present invention, even when a power generation is performed by burning coal blended with coal having different characteristics depending on the country of origin, it is possible to easily create a coal purchase plan with a low total cost per unit power generation amount. Can do.

It is a figure showing the discharge part place of each discharge | emission in a coal-fired power station. It is a figure which shows the structure of the coal seed selection apparatus 10 for electric power generation. It is a figure which shows the structure of the coal seed selection apparatus 10 for electric power generation. It is the flowchart showing the flow of the data processing in the coal seed selection apparatus 10 for a power generation of a present Example. It is the table | surface showing the weight ratio of the other coal types required in order to obtain the same calorific value. It is the list | wrist which showed the weight ratio of the other coal types mixed with A coal type based on the emitted-heat amount in order to obtain the same emitted-heat amount. It is the table | surface which showed the purchase cost and transport cost of coal per unit weight. It is the table | surface which showed the weight ratio of the generated coal ash for every coal type. It is the table | surface which showed the density | concentration of the process target substance which will be contained in each discharge | emission when A type of coal is burned. It is the table | surface which showed the allowable density | concentration of the process target substance prescribed | regulated by law. It is the table | surface which showed the primary processing cost per unit weight of each discharge | emission material in simulation. It is the table | surface which showed the secondary treatment cost per unit weight of each discharge | emission in simulation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Input part 3 Input processing part 5 Data storage part 7 Calculation part 9 Output part 11
DESCRIPTION OF SYMBOLS 10 Coal seed | species selection apparatus 11 for power generation Output control part S1 Coal seed weight calculation stage S2 Purchase and transportation cost calculation stage S3 Emission weight calculation stage S4 Process target substance calculation stage S5 Primary treatment cost calculation stage S6 Secondary treatment cost calculation stage S7 Environmental tax calculation stage S8 Revenue calculation stage S9 Coal type determination stage

Claims (4)

A method for selecting a coal type for power generation to support optimization of a purchase plan of coal as a fuel for power generation in a thermal power plant,
Coal mixed with different coal types is used for coal.
A purchase / transport cost calculation stage for calculating the purchase cost of coal necessary for the desired amount of power generation and the transport cost of the coal;
Calculate the amount of each type of coal ash, wastewater, sludge, gypsum, exhaust gas, etc. generated by burning coal, and treat it as a pretreatment subject to disposal Processing substance calculation stage to calculate each concentration of
Revenue calculation stage for calculating resource utilization revenue obtained by effectively using generated waste as resources,
A processing cost calculation stage for calculating processing costs required to dispose of each waste that could not be effectively used as resources;
The purchase costs, transportation costs, to calculate the resource usage revenues and disposal costs, coal types of coal purchased such that the total cost is cheaper required per unit power generation amount and to determine the mixture ratio View this Low coal A method for selecting a coal type for power generation, comprising: a seed determination step.   The method further includes an environmental tax calculation stage for calculating a tax amount of an environmental tax imposed when the coal is burned. In the coal type determination stage, the type of coal to be purchased is determined by calculating the taxable amount. The method for selecting a coal type for power generation according to claim 1.   3. The various types of coal ash are clinker ash collected near the boiler, cinder ash collected near the boiler outlet, and EP ash collected electrostatically. The method for selecting the coal type for power generation described. A program for selecting a coal type for power generation to support optimization of a purchase plan for coal as a fuel for power generation in a thermal power plant,
Coal mixed with different coal types is used for coal.
A purchase / transport cost calculation stage for calculating the purchase cost of coal necessary for the desired amount of power generation and the transport cost of the coal;
Calculate the amount of each type of coal ash, wastewater, sludge, gypsum, exhaust gas, etc. generated by burning coal, and treat it as a pretreatment subject to disposal Processing substance calculation stage to calculate each concentration of
Revenue calculation stage for calculating resource utilization revenue obtained by effectively using generated waste as resources,
A processing cost calculation stage for calculating processing costs required to dispose of each waste that could not be effectively used as resources;
The purchase costs, transportation costs, to calculate the resource usage revenues and disposal costs, coal types of coal purchased such that the total cost is cheaper required per unit power generation amount and to determine the mixture ratio View this Low coal A program for selecting a coal seed for power generation, characterized by causing a computer to execute a seed determination stage.

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