Method and system for determining coal blending schemes for different coal types in thermal power plant

Abstract

A method and system for determining coal blending schemes for different coal types in a thermal power plant. The method comprises: acquiring coal type data of a coal yard and historical operation data of a coal treatment apparatus and a coal environmental protection system; on the basis of the coal type data of the coal yard and the historical operation data of the coal treatment apparatus and the coal environmental protection system, establishing constraint conditions for minimum calorific value, ignition stability, sulfur content, moisture content and ash content of blended coal fed into a boiler; on the basis of the constraint conditions, determining the blending and firing ratio for different coal types, so as to obtain a plurality of coal blending schemes; and by using the lowest comprehensive power supply cost as an objective, establishing an objective function, solving objective function values for the plurality of coal blending schemes, and, on the basis of the objective function values, obtaining a final coal blending scheme of the thermal power plant. The present invention determines various constraint conditions for blended coal on the basis of the current operation status of unit apparatuses, such that the coal blending and firing scheme better conforms to the actual operation conditions of a unit. In addition, since the coal blending scheme is obtained by performing big data analysis on various data, the method is simple and feasible, involves relatively low cost, and can increase the blending proportions of economical coal types, thereby lowering power generation cost, improving resource utilization efficiency, and realizing sustainable development of energy.

Description

Method and system for determining coal blending scheme of different coal types in thermal power plant TECHNICAL FIELD

[0001] The present application relates to the field of coal-fired power generation technology, and in particular to a method and system for determining a coal blending scheme of different coal types in a thermal power plant. BACKGROUND

[0002] Coal costs account for more than 70% of the operation cost of a power plant, and reducing coal prices is the top priority for cost control. In recent years, low-cost coal sources have been explored to reduce coal costs, such as blending high-moisture lignite, high-ash low-calorific value bituminous coal, coal slime and other multi-element economic coal types. In addition, waste, sludge, biomass and other unconventional coal have also begun to be blended in power plants, and the blending ratio has gradually increased. However, due to insufficient understanding of the characteristics of multi-element coal and equipment limitations, problems such as insufficient drying capacity of the coal mill, limited load carrying capacity of the boiler, air preheater blockage, and poor coal flow in the coal drop pipe occur during coal combustion, which seriously affects the safe and stable operation of the boiler equipment.

[0003] In addition, existing coal blending models mostly focus on economic evaluation and fail to fully consider the actual operating conditions and load changes of the unit equipment, making it difficult to balance the comprehensive operation requirements of safety, efficiency, economy and environmental protection in actual operation. Therefore, although these methods provide a reference for blending decision-making to some extent, there is a lack of a comprehensive and scientific evaluation system to guide thermal power enterprises to achieve the optimal blending scheme.

[0004] SUMMARY

[0005] This section is intended to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the specification to avoid obscuring the purpose of this section, the abstract and the title, and such simplifications or omissions cannot be used to limit the scope of the present application.

[0006] In view of the above existing problems, the present application is proposed. Therefore, the present application provides a method for determining a coal blending scheme of different coal types in a thermal power plant to solve the problems of complex coal blending decision-making and coal blending scheme not adapting to the actual operation of the unit in the prior art.

[0007] To solve the above technical problems, the present application provides the following technical solutions:

[0008] In a first aspect, the present application provides a method for determining a coal blending scheme of different coal types in a thermal power plant, comprising:

[0009] obtaining coal type data of a coal yard and historical operation data of coal handling equipment and a coal-fired environmental protection system;

[0010] According to the coal type data of the coal yard and the historical operation data of the coal handling equipment and the coal-fired environmental protection system, constraint conditions of the minimum calorific value, ignition stability, sulfur content, moisture content and ash content of the mixed coal into the furnace are established;

[0011] Based on the constraint conditions, the blending ratio of different coal types is determined to obtain a plurality of coal blending schemes;

[0012] A target function is established with the lowest comprehensive power supply cost as the target, the target function values of the plurality of coal blending schemes are solved, and based on the target function values, the final coal blending scheme of the thermal power plant is obtained.

[0013] As a preferred scheme of the method for determining the coal blending scheme of different coal types in the thermal power plant, the historical operation data of the coal handling equipment and the coal-fired environmental protection system includes,

[0014] The coal handling equipment includes a coal mill and a burner;

[0015] The coal-fired environmental protection system includes a desulfurization system, a denitration system and a dust removal system.

[0016] As a preferred scheme of the method for determining the coal blending scheme of different coal types in the thermal power plant, the constraint conditions of the minimum calorific value, ignition stability, sulfur content, moisture content and ash content of the mixed coal into the furnace include,

[0017] The constraint condition of the minimum calorific value of the mixed coal into the furnace is that the total heat of the mixed coal into the furnace is greater than or equal to the boiler heat load corresponding to the power generation power of the unit under different loads;

[0018] The constraint condition of the ignition stability of the mixed coal into the furnace is that the ignition temperature of the mixed coal into the furnace is less than or equal to the minimum ignition temperature of the burner under different loads;

[0019] The constraint condition of the sulfur content of the mixed coal into the furnace is that the sulfur content of the mixed coal into the furnace is less than or equal to the maximum output of the desulfurization system under different loads;

[0020] The constraint condition of the moisture content of the mixed coal into the furnace is that the drying output of the coal mill determined by the moisture content of the coal is greater than or equal to the maximum output of the coal mill under different loads, and the outlet air temperature of the coal mill is higher than the water dew point temperature;

[0021] The constraint condition of the ash content of the mixed coal into the furnace is that the ash content of the mixed coal into the furnace is less than or equal to the maximum output of the dust removal system under different loads.

[0022] As a preferred scheme of the method for determining the coal blending scheme of different coal types in the thermal power plant, the method further includes,

[0023] The total heat of the mixed coal into the furnace is obtained by the maximum output of the coal mill, the blending ratio of the coal and the low calorific value;

[0024] The ignition temperature of the mixed coal entering the furnace is obtained by the volatile matter and ash content of the mixed coal entering the furnace;

[0025] The sulfur content of the mixed coal entering the furnace is obtained by the received base total sulfur of the mixed coal entering the furnace and the blending ratio of the coal types;

[0026] The drying output of the coal mill is obtained by the inlet air temperature of the coal mill, the total moisture of the coal type, the ventilation volume of the coal mill and the blending ratio of the coal type;

[0027] The ash content of the mixed coal entering the furnace is obtained by the received base ash content of the mixed coal entering the furnace and the blending ratio of the coal type.

[0028] As a preferred scheme of the method for determining the coal blending scheme of different coal types in a thermal power plant, the maximum output of the coal mill comprises,

[0029] The historical data of the output of the coal mill under different loads is obtained, the historical data is preprocessed and grouped, the maximum output value of each group is obtained, and the maximum output of the coal mill is obtained by averaging the maximum output values of the groups.

[0030] As a preferred scheme of the method for determining the coal blending scheme of different coal types in a thermal power plant, the method comprises,

[0031] Based on the constraint conditions of the lowest calorific value, ignition stability, sulfur content, moisture content and ash content of the mixed coal entering the furnace, the blending ratio of different coal types is adjusted to obtain multiple coal blending schemes.

[0032] As a preferred scheme of the method for determining the coal blending scheme of different coal types in a thermal power plant, the method comprises,

[0033] The comprehensive power supply cost comprises power supply coal consumption, coal cost, environmental protection cost and maintenance cost;

[0034] The target function is expressed as:

[0035] Wherein, P r,z represents the comprehensive power supply cost, B g represents the power supply coal consumption, P r,i represents the unit price of standard coal of the coal type i, P r,NOx represents the denitration cost, P r,so2 represents the desulfurization cost, P r,w represents the unit price of standard coal of the coal type i, P i represents the blending ratio of the coal type i, and n represents the total number of coal types;

[0036] In a second aspect, the present application provides a system for determining the coal blending scheme of different coal types in a thermal power plant, which comprises,

[0037] The data acquisition module is configured to acquire coal type data of the coal yard and historical operation data of the coal handling equipment and the coal-fired environmental protection system.

[0038] The constraint condition establishment module is configured to establish constraint conditions of a minimum calorific value, ignition stability, sulfur content, moisture content and ash content of the mixed coal based on the coal type data of the coal yard and the historical operation data of the coal handling equipment and the coal-fired environmental protection system.

[0039] The coal blending scheme acquisition module is configured to determine a blending ratio of different coal types to obtain a plurality of coal blending schemes based on the constraint conditions.

[0040] The objective function establishment module is configured to establish an objective function with a lowest comprehensive power supply cost as a target to solve objective function values of the plurality of coal blending schemes.

[0041] The final coal blending scheme acquisition module is configured to acquire a final coal blending scheme of the thermal power plant based on the objective function values.

[0042] In a third aspect, the present application provides a computing device, comprising:

[0043] a memory and a processor;

[0044] The memory is configured to store computer executable instructions, and the processor is configured to execute the computer executable instructions, so as to realize the steps of the method for determining a coal blending scheme of different coal types of a thermal power plant.

[0045] In a fourth aspect, the present application provides a computer readable storage medium, which stores computer executable instructions, and the computer executable instructions are executed by a processor to realize the steps of the method for determining a coal blending scheme of different coal types of a thermal power plant.

[0046] Compared with the prior art, the present application has the beneficial effects that: the present application obtains the historical operation data of the coal mill, the burner, the desulfurization system, the denitration system and the dust removal system, masters the operation conditions of each auxiliary equipment of the unit, then determines the constraint conditions of the mixed coal according to the operation status of the unit equipment, and continuously updates the unit equipment data, so that the coal blending and burning scheme is more in line with the actual operation condition of the unit; the mixed coal scheme is obtained through big data analysis on the historical data, then the blending ratio of different coal types is obtained by combining the coal quality test data and the comprehensive power supply cost calculation data, without the need to carry out burning test, which is simple and easy to operate, and the cost is low, the complex test process is avoided, the coal blending process is significantly simplified, and the decision cost is reduced; the present application takes the lowest comprehensive power supply cost as the basic principle, determines the optimal coal blending scheme by comprehensively considering multiple economic indexes such as power supply coal consumption, coal cost, environmental protection cost and maintenance cost, not only improves the blending ratio of economic coal, reduces the power generation cost, but also enhances the coal flexibility of the power plant, so that the power plant can better cope with the fluctuation of the coal market and improve the production and operation difficulties; the coal blending scheme of the present application optimizes the blending ratio of different coal types, so that the low-quality coal that may be abandoned due to quality problems can be effectively utilized, the resource utilization efficiency is improved, and the sustainable development of energy is helpful. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0048] Fig. 1 is a schematic diagram of the overall process of the method for determining the coal blending scheme of different coal types in a thermal power plant according to an embodiment of the present application;

[0049] Fig. 2 is a schematic diagram of the overall process of the method for determining the coal blending scheme of different coal types in a thermal power plant according to an embodiment of the present application;

[0050] Fig. 3 is a schematic diagram of the comprehensive power supply cost calculation value under different coal blending schemes of the method for determining the coal blending scheme of different coal types in a thermal power plant according to an embodiment of the present application. DETAILED DESCRIPTION

[0051] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings in the specification. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0052] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details set forth in this description. In other instances, well-known methods, procedures, components, and circuits have not been described in detail so as not to unnecessarily obscure aspects of the present application.

[0053] It should also be noted that, as used herein, "the embodiment" and "embodiments" refers to any one of the implementations of the present application, including specific feature, structure, or characteristic within the present application. "In one embodiment" and "in another embodiment" do not necessarily refer to the same embodiment, though they can. The terms "in one embodiment" and "in another embodiment" are used interchangeably with the term "in at least one embodiment."

[0054] The present application is described in detail below in conjunction with the drawings, which are meant to be exemplary and not limiting. In the drawings, the same reference numerals are used to represent the same elements throughout the several views. In the drawings, the thickness of the layers or regions are exaggerated for clarity. Like reference numerals in the description represent like elements in the figures.

[0055] In the description of the present application, it should be noted that the terms "upper", "lower", "inner" and "outer" and the like, indicate relative positions or orientation based on the positions or orientation shown in the drawings, and are used only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the systems or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present application. In addition, the terms "first", "second" or "third" are used only for the purpose of description, and should not be construed as indicating or implying relative importance.

[0056] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connected", "connection" should be interpreted broadly, for example: it can be fixed connection, detachable connection or integral connection; it can also be mechanical connection, electrical connection or direct connection, it can also be indirectly connected through intermediate media, or it can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0057] Embodiment 1

[0058] Referring to FIGS. 1-2, in one embodiment of the present application, a method for determining a coal blending scheme of different coal types in a thermal power plant is provided, comprising:

[0059] S100: obtaining coal type data of a coal yard and historical operation data of a coal handling equipment and a coal-fired environmental protection system;

[0060] Preferably, the coal handling equipment includes a coal mill and a burner.

[0061] The coal-fired environmental protection system comprises a desulfurization system, a denitration system and a dust removal system.

[0062] In the embodiment of the present application, the coal type data comprises a coal type, a quantity and coal quality test data, etc.

[0063] It should be noted that after successfully obtaining the coal type data and the historical operation data of the coal mill, the burner, the desulfurization system, the denitration system and the dust removal system, the data is preprocessed, and the data preprocessing process mainly comprises data cleaning, i.e. removing outliers, correcting errors and filling missing values, to ensure the data is complete and accurate, and to unify the coal type category code, so as to be directly used for subsequent analysis and evaluation of the coal type burning ratio, the equipment operation efficiency and the environmental protection system performance, etc.

[0064] S102: According to the coal type data of the coal yard and the historical operation data of the coal-fired treatment equipment and the coal-fired environmental protection system, a minimum calorific value, an ignition stability, a sulfur content and a moisture content of the mixed coal entering the furnace and a blending scheme are established;

[0065] Preferably, the constraint condition of the minimum calorific value of the mixed coal entering the furnace is that the total heat of the mixed coal entering the furnace is greater than or equal to the boiler heat load corresponding to the unit power generation power under different loads; the total heat of the mixed coal entering the furnace is obtained by the maximum output of the coal mill, the blending ratio of the coal and the low calorific value;

[0066] In the embodiment of the present application, the constraint condition of the minimum calorific value of the mixed coal entering the furnace is expressed as:

[0067] Wherein, m b represents the maximum output of the coal mill, the unit is t / h, Q net,ar,i represents the low calorific value of the coal type i, the unit is MJ / kg, P i represents the blending ratio of the coal type i, the unit is %, Q v represents the boiler heat load, the unit is MW, P e represents the unit power generation power, the unit is MW, and n represents the total number of coal types;

[0068] Preferably, obtaining the maximum output of the coal mill comprises obtaining the historical data of the output of the coal mill under different loads, preprocessing and grouping the historical data, obtaining the maximum output value of each group, averaging the maximum output values of each group to obtain the maximum output of the coal mill;

[0069] Specifically, in order to accurately evaluate the maximum output of the coal mill, the output history data of the coal mill under different load conditions are collected first, the data are cleaned to eliminate abnormal values and error records, and the accuracy and reliability of the data are ensured; the cleaned data are grouped according to the load size, and each group represents a specific load interval; for each load group, all data points in the interval are analyzed in depth to obtain the maximum output value of the coal mill in the group, and the performance limit of the coal mill under different load levels is obtained; the maximum output values of all load groups are averaged, and the average processing helps to balance the performance difference of each load group, and provides a comprehensive perspective for the performance evaluation of the coal mill; through the above preprocessing and grouping analysis method, the maximum output of the coal mill is successfully obtained, which provides data support for subsequent acquisition of coal blending ratio.

[0070] Preferably, the ignition stability constraint condition of the mixed coal entering the furnace is that the ignition temperature of the mixed coal entering the furnace is less than or equal to the minimum ignition temperature of the burner under different loads; the ignition temperature of the mixed coal entering the furnace is obtained through the volatile matter and ash content of the mixed coal entering the furnace;

[0071] In the embodiment of the application, the ignition stability constraint condition of the mixed coal entering the furnace is represented as: d ≤T r,min (P e )

[0072] Wherein, T d represents the ignition temperature of the mixed coal entering the furnace, unit: ℃, T r,min represents the minimum ignition temperature required by the burner under different loads, unit: ℃, P e represents the power generation of the unit, unit: MW;

[0073] In the embodiment of the application, the calculation formula of the ignition temperature of the mixed coal entering the furnace is:

[0074] Wherein, T d represents the ignition temperature of the mixed coal entering the furnace, unit: ℃, V daf,i represents the dry ash-free volatile matter of coal i, unit: %, A ad,i represents the dry ash content of coal i, unit: %, M ad,i represents the air-dry basis moisture of coal i, unit: %, P i represents the blending ratio of coal i, unit: %, and n represents the total number of coal types;

[0075] Preferably, the constraint condition of the sulfur content of the mixed coal entering the furnace is that the sulfur content of the mixed coal entering the furnace is less than or equal to the maximum output of the desulfurization system under different loads; the sulfur content of the mixed coal entering the furnace is obtained through the total sulfur received by the mixed coal entering the furnace and the blending ratio of the coal type;

[0076] In the embodiments of the present application, the constraint condition of the sulfur content of the mixed coal fed into the furnace is represented as: S ar,zs m b ≤m SO2

[0077] wherein S ar,zs represents the equivalent sulfur content of the mixed coal fed into the furnace, in %; m b represents the maximum output of the coal mill, in t / h; m so2 represents the maximum output of the desulfurization system, in t / h;

[0078] In the embodiments of the present application, the calculation formula of the sulfur content of the mixed coal fed into the furnace is:

[0079] wherein S ar,zs represents the equivalent sulfur content of the mixed coal fed into the furnace, in %; S t,ar,i represents the received basis total sulfur of the coal i, in %; Q net,ar,i represents the low calorific value of the coal i, in MJ / kg; P i represents the blending ratio of the coal i, in %; and n represents the total number of coal classes.

[0080] Preferably, the constraint condition of the moisture content of the mixed coal fed into the furnace is that, under different loads, the drying output of the coal mill determined by the moisture content of the coal is greater than or equal to the maximum output of the coal mill, and the outlet air temperature of the coal mill is higher than the dew point temperature of water; the drying output of the coal mill is obtained through the inlet air temperature of the coal mill, the total moisture content of the coal, the ventilation quantity of the coal mill and the blending ratio of the coal.

[0081] In the embodiments of the present application, the constraint condition of the moisture content of the mixed coal fed into the furnace is represented as: T m,out >T w,d

[0082] wherein T m,in represents the inlet air temperature of the coal mill, in ℃; T m,out represents the outlet air temperature of the coal mill, in ℃; M t,i represents the total moisture content of the coal i, in %; V PA represents the ventilation quantity of the coal mill, in t / h; T w,d represents the dew point temperature of water, in ℃; T b represents the maximum output of the coal mill, in t / h; P i represents the blending ratio of the coal i, in %; and n represents the total number of coal classes.

[0083] Preferably, the constraint condition of the ash content of the mixed coal fed into the furnace is that, under different loads, the ash content of the mixed coal fed into the furnace is less than or equal to the maximum output of the dust removal system; the ash content of the mixed coal fed into the furnace is obtained through the received basis ash content of the mixed coal and the blending ratio of the coal.

[0084] In the embodiment of the present application, the constraint condition of the ash content of the mixed coal entering the furnace is represented as: A ar,zs m b ≤m ash

[0085] Wherein, A ar,zs represents the equivalent ash content of the mixed coal entering the furnace, with the unit of %; m ash represents the maximum output of the dust removal system, with the unit of t / h; m b represents the maximum output of the coal mill, with the unit of t / h;

[0086] In the embodiment of the present application, the calculation formula of the ash content of the mixed coal entering the furnace is:

[0087] Wherein, A ar,zs represents the equivalent ash content of the mixed coal entering the furnace, with the unit of %; A ar,i represents the received basis ash content of the coal i, with the unit of %; m b represents the maximum output of the coal mill, with the unit of t / h; P i represents the blending ratio of the coal i, with the unit of %; n represents the total number of coal classes;

[0088] It should be noted that the core of the present application is to establish a series of scientific and fine constraint conditions to optimize the coal blending scheme of the thermal power plant. The establishment of these constraint conditions ensures that the thermal power plant can realize efficient use of energy and significantly improve economic benefits by accurately calculating the balance between the maximum output of the coal mill and the heat load of the boiler under different loads. The present application effectively controls the pollutant content of the mixed coal entering the furnace by setting the constraint conditions of sulfur content and ash content, ensures that the desulfurization system and the dust removal system can operate efficiently, thereby significantly reducing the emission of sulfur dioxide and dust, and makes a positive contribution to environmental protection and sustainable development. Considering the operating efficiency of the coal mill, the present application determines a reasonable blending ratio by analyzing the influencing factors of the drying output of the coal mill, so that the coal mill can maintain a high operating efficiency under different loads, reduces wear and maintenance costs, and prolongs the service life of the equipment.

[0089] S104: based on the constraint conditions of the minimum calorific value, ignition stability, sulfur content, moisture content and ash content of the mixed coal entering the furnace, adjusting the blending ratio of different coal types to obtain multiple coal blending schemes;

[0090] Preferably, based on the constraint conditions of the minimum calorific value, ignition stability, sulfur content, moisture content and ash content of the mixed coal entering the furnace, adjusting the blending ratio of different coal types to obtain multiple coal blending schemes;

[0091] It should be noted that under various constraints, the present application generates multiple optimized coal blending schemes by flexibly adjusting the blending ratio of coal types, which not only provides power plants with diversified options to cope with risks such as price fluctuations and unstable supply of coal types, but also promotes technological innovation and improves boiler thermal efficiency and overall operational efficiency; the existence of multiple schemes enhances the scientificity and rationality of decision-making, and the subsequent acquisition of the best scheme also provides strong support for power plants to achieve double improvement of economic benefits and environmental benefits.

[0092] S106: Establish a target function with the lowest comprehensive power supply cost as the target, solve the target function values of multiple coal blending schemes, and obtain the final coal blending scheme of the power plant based on the target function values;

[0093] Preferably, the comprehensive power supply cost includes power supply coal consumption, coal cost, environmental protection cost and maintenance cost;

[0094] The target function is represented as:

[0095] Where, P r,z represents the comprehensive power supply cost, B g represents the power supply coal consumption, P r,i represents the unit price of standard coal of coal type i, P r,NOx represents the denitration cost, P r,so2 represents the desulfurization cost, P r,w represents the unit price of standard coal of coal type i, P i represents the blending ratio of coal type i, unit: %, and n represents the total number of coal types;

[0096] In the embodiments of the present application, the power supply coal consumption is calculated by the power industry standard "Guidelines for Online Calculation of Coal Consumption of Thermal Power Generators";

[0097] It should be noted that the target function is established with the lowest comprehensive power supply cost as the target, and the target function values of multiple coal blending schemes are solved, which is a key step for the present application to optimize the coal blending scheme of the power plant. By comprehensively considering the power supply coal consumption, coal cost, environmental protection cost and unit maintenance cost, the present application can comprehensively evaluate the economy and environmental protection of different coal blending schemes; the present application has the remarkable beneficial effect that it can ensure that the power plant selects the coal blending scheme with the lowest cost under the premise of meeting all operating constraints, which not only helps to reduce the operating cost of the power plant and improve its market competitiveness, but also promotes the rational use of resources and reduces unnecessary waste. Since the environmental protection cost is included in the target function, the power plant can better fulfill its environmental protection responsibilities while pursuing economic benefits, achieving a win-win of economic benefits and environmental benefits.

[0098] The above is a schematic scheme of the method for determining the coal blending scheme of different coal types in the thermal power plant according to the present embodiment. It should be noted that the technical scheme of the system for determining the coal blending scheme of different coal types in the thermal power plant and the technical scheme of the method for determining the coal blending scheme of different coal types in the thermal power plant described above belong to the same concept. The technical scheme of the system for determining the coal blending scheme of different coal types in the thermal power plant according to the present embodiment is not described in detail, and the description of the technical scheme of the method for determining the coal blending scheme of different coal types in the thermal power plant described above can be referred to.

[0099] The system for determining the coal blending scheme of different coal types in the thermal power plant according to the present embodiment comprises:

[0100] The data acquisition module is configured to acquire the coal type data of the coal yard and the historical operation data of the coal handling equipment and the coal-fired environmental protection system.

[0101] The constraint condition establishment module is configured to establish constraint conditions of the minimum calorific value, the ignition stability, the sulfur content, the moisture content and the ash content of the mixed coal entering the furnace according to the coal type data of the coal yard and the historical operation data of the coal handling equipment and the coal-fired environmental protection system.

[0102] The coal blending scheme acquisition module is configured to determine a plurality of coal blending schemes based on the constraint conditions and the blending ratio of different coal types.

[0103] The objective function establishment module is configured to establish an objective function with the lowest comprehensive power supply cost as the target and solve the objective function values of the plurality of coal blending schemes.

[0104] The final coal blending scheme acquisition module is configured to acquire the final coal blending scheme of the thermal power plant based on the objective function values.

[0105] The present embodiment also provides a computing device suitable for determining the coal blending scheme of different coal types in the thermal power plant, comprising:

[0106] The memory is configured to store computer executable instructions, and the processor is configured to execute the computer executable instructions to implement the method for determining the coal blending scheme of different coal types in the thermal power plant according to the above embodiment.

[0107] The present embodiment also provides a storage medium having a computer program stored thereon, which is executed by the processor to implement the method for determining the coal blending scheme of different coal types in the thermal power plant according to the above embodiment.

[0108] The storage medium according to the present embodiment and the method for determining the coal blending scheme of different coal types in the thermal power plant according to the above embodiment belong to the same inventive concept. The technical details not described in detail in the present embodiment can be referred to the above embodiment, and the present embodiment has the same beneficial effects as the above embodiment.

[0109] Through the above description of the embodiments, those skilled in the art can clearly understand that the present application can be realized by means of software and necessary general hardware, and of course can also be realized by hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as a floppy disk, a read-only memory (ROM), a random access memory (RAM), a FLASH memory, a hard disk, or an optical disc, and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of various embodiments of the present application.

[0110] Embodiment 2

[0111] Referring to FIG. 3 and Tables 1-2, for one embodiment of the present application, a method for determining a coal blending scheme of different coal types in a thermal power plant is provided, and results of several coal blending schemes are provided to verify the beneficial effects thereof.

[0112] Obtain coal quality test data of all stored coal types in the coal yard, as shown in Table 1;

[0113] Table 1 Coal quality test data

[0114] Obtain historical operation data of the coal mill, the burner, the desulfurization system, the denitration system, and the dust removal system, and determine constraint values of the minimum calorific value, the ignition stability, the sulfur content, the moisture content, and the ash content of the blended coal into the furnace according to the coal quality test data and the historical operation data of the unit, as shown in Table 2:

[0115] Table 2 Constraint indexes of blended coal established for a unit

[0116] According to the constraint indexes of Tables 1 and 2 and the stored coal in the coal yard, calculate the blending ratios of coal types 1-5, and obtain three coal blending schemes of a unit under 100% load as shown in FIG. 3, calculate the comprehensive power supply cost of the unit under different coal blending schemes = coal cost + environmental protection cost, the environmental protection cost includes denitration cost, desulfurization cost, and unit maintenance and repair cost, select the coal blending scheme with the lowest comprehensive power supply cost as the optimal coal blending scheme, determine the blending ratios of different coal types, and for example, in FIG. 3, the comprehensive power supply cost of the unit corresponding to the first coal blending scheme is the smallest, and therefore the first coal blending scheme is selected as the optimal coal blending scheme;

[0117] In summary, the application realizes the optimization selection of the coal blending scheme of the thermal power plant by comprehensively using the coal quality testing data, the historical operation data of the unit and various constraint conditions, and not only provides a scientific and reasonable coal blending scheme for the thermal power plant, but also provides strong support for reducing the operation cost and improving the environmental protection performance.

[0118] It should be noted that the above examples are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A method for determining a coal blending scheme of different coal types in a thermal power plant, characterized in that, The method comprises the following steps: acquiring coal type data of a coal yard and historical operation data of a coal handling device and a coal-fired environmental protection system; establishing constraint conditions of a minimum calorific value, ignition stability, sulfur content, moisture content and ash content of mixed coal entering a furnace according to the coal type data of the coal yard and the historical operation data of the coal handling device and the coal-fired environmental protection system; determining a plurality of coal blending schemes by adjusting a blending ratio of different coal types based on the constraint conditions; establishing a target function with the lowest comprehensive power supply cost as a target, solving a target function value of the plurality of coal blending schemes, and acquiring a final coal blending scheme of a thermal power plant based on the target function value.

2. The method for determining a coal blending scheme of different coal types in a thermal power plant according to claim 1, characterized in that, The historical operation data of the coal handling device and the coal-fired environmental protection system comprises: the coal handling device comprises a coal mill and a burner; the coal-fired environmental protection system comprises a desulfurization system, a denitration system and a dust removal system.

3. The method for determining a coal blending scheme of different coal types in a thermal power plant according to claim 1 or 2, characterized in that, The constraint conditions of the minimum calorific value, ignition stability, sulfur content, moisture content and ash content of the mixed coal entering the furnace comprise: the constraint condition of the minimum calorific value of the mixed coal entering the furnace is that the total heat of the mixed coal entering the furnace is greater than or equal to a boiler heat load corresponding to a power generation capacity of a unit under different loads; the constraint condition of the ignition stability of the mixed coal entering the furnace is that an ignition temperature of the mixed coal entering the furnace is less than or equal to a minimum ignition temperature of the burner under different loads; the constraint condition of the sulfur content of the mixed coal entering the furnace is that the sulfur content of the mixed coal entering the furnace is less than or equal to a maximum output of the desulfurization system under different loads; the constraint condition of the moisture content of the mixed coal entering the furnace is that a drying output of the coal mill determined by the moisture content of the coal is greater than or equal to a maximum output of the coal mill under different loads, and an inlet air temperature of the coal mill is higher than a water dew point temperature; the constraint condition of the ash content of the mixed coal entering the furnace is that the ash content of the mixed coal entering the furnace is less than or equal to a maximum output of the dust removal system under different loads.

4. The method for determining a coal blending scheme of different coal types in a thermal power plant according to claim 3, characterized in that, The method further comprises the following steps: the total heat of the mixed coal entering the furnace is acquired by the maximum output of the coal mill, the blending ratio of the coal and a low calorific value; the ignition temperature of the mixed coal entering the furnace is acquired by volatile matter and ash content of the mixed coal entering the furnace; the sulfur content of the mixed coal entering the furnace is acquired by base total sulfur received by the mixed coal entering the furnace and the blending ratio of the coal type; the drying output of the coal mill is acquired by an inlet air temperature of the coal mill, total moisture content of the coal, a ventilation volume of the coal mill and the blending ratio of the coal type; the ash content of the mixed coal entering the furnace is acquired by base ash content received by the mixed coal entering the furnace and the blending ratio of the coal type.

5. The method for determining the coal blending scheme of different coal types in a thermal power plant according to claim 4, characterized in that, The maximum output of the coal mill comprises the following steps: acquiring historical output data of the coal mill under different loads, preprocessing and grouping the historical data, acquiring a maximum output value of each group, averaging the maximum output values of the groups, and acquiring the maximum output of the coal mill.

6. The method for determining a coal blending scheme for different coal types in a thermal power plant according to claim 1, wherein, The plurality of coal blending schemes are determined by the following steps: the blending ratio of the different coal types is adjusted based on the constraint conditions of the minimum calorific value, ignition stability, sulfur content, moisture content and ash content of the mixed coal entering the furnace, and the plurality of coal blending schemes are acquired.

7. The method for determining a coal blending scheme of different coal types in a thermal power plant according to Claim 1, characterized in that, The target function is established with the lowest comprehensive power supply cost as a target, and the target function value of the plurality of coal blending schemes is solved, and the final coal blending scheme of the thermal power plant is acquired based on the target function value. The comprehensive power supply cost comprises power supply coal consumption, coal cost, environmental protection cost and maintenance cost. The objective function is expressed as: Wherein, P r,z represents the comprehensive power supply cost, B g represents the power supply coal consumption, P r,i represents the standard coal unit price of coal i, P r,NOx represents the denitration cost, P r,so2 represents the desulfurization cost, P r,w represents the unit maintenance and repair cost, P i represents the blending ratio of coal i, unit: %, n represents the total number of coal types; 8. A system for determining a coal blending scheme for different coal types in a thermal power plant, characterized in that, The method comprises the following steps: a data acquisition module is configured to acquire coal type data of a coal yard and historical operation data of a coal handling device and a coal-fired environmental protection system; a constraint condition establishment module is configured to establish constraint conditions of a minimum calorific value, ignition stability, sulfur content, moisture content and ash content of mixed coal entering a furnace according to the coal type data of the coal yard and the historical operation data of the coal handling device and the coal-fired environmental protection system; The coal blending scheme obtaining module is configured to determine a blending ratio of different coal types based on the constraint conditions to obtain a plurality of coal blending schemes. The objective function establishing module is configured to establish an objective function with the lowest comprehensive power supply cost as a target, and solve objective function values of the plurality of coal blending schemes. The final coal blending scheme obtaining module is configured to obtain a final coal blending scheme of the thermal power plant based on the objective function values. 9.An electronic device, comprising: a memory and a processor; the memory is configured to store computer executable instructions, and the processor is configured to execute the computer executable instructions, and the computer executable instructions, when executed by the processor, implement the steps of the method for determining a coal blending scheme of different coal types of a thermal power plant according to any one of claims 1 to 7. 10.A computer readable storage medium storing computer executable instructions, and the computer executable instructions, when executed by a processor, implement the steps of the method for determining a coal blending scheme of different coal types of a thermal power plant according to any one of claims 1 to 7. ​

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