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

Abstract

The invention discloses a method and a system for determining coal blending schemes of different coal types of a thermal power plant. The method comprises the following steps: acquiring coal type data of a coal yard and historical operation data of fire coal processing equipment and a fire coal environmental protection system; according to the coal type data of the coal yard and the historical operation data of the fire coal processing equipment and the fire coal environmental protection system, establishing a coal blending scheme including the minimum heat value, the ignition stability, the sulfur content and the water content of the mixed coal entering the furnace; and establishing an objective function by taking the lowest comprehensive power supply cost as an objective, solving objective function values of the plurality of coal blending schemes, and obtaining a final coal blending scheme of the thermal power plant based on the objective function values. According to the method, various constraint conditions of coal blending are determined according to the current operation situation of unit equipment, so that the coal blending combustion scheme better conforms to the actual operation situation of a unit; the coal blending scheme is obtained by performing big data analysis on various data, the method is simple and feasible, the cost is relatively low, the blending proportion of economic coal types is improved, the power generation cost is reduced, the resource utilization efficiency is improved, and the sustainable development of energy is realized.

Description

Technical Field

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

[0002] Coal costs account for more than 70% of the power generation and operation costs of power plants, and reducing coal prices is the top priority for cost control. In order to reduce coal costs, low-cost coal sources have been developed in recent years, and multiple economic coal types such as high-moisture lignite, high-ash low-calorific value bituminous coal, and coal slime have been mixed and burned; in addition, unconventional coal such as garbage, sludge, and biomass have also begun to enter power plants for mixing and burning, and the mixing ratio has gradually increased. However, due to insufficient understanding of the characteristics of multiple coals and equipment conditions, problems such as insufficient drying output of the pulverizer, limited boiler load, air preheater blockage, and poor coal discharge from the coal drop pipe occurred during the combustion process, which seriously affected the safe and stable operation of the boiler equipment.

[0003] In addition, most of the existing coal blending models focus on economic evaluation and fail to fully consider the actual operating conditions and load changes of the unit equipment, making it difficult to take into account the comprehensive operation requirements of safety, efficiency, economy and environmental protection in actual operation. Therefore, although these methods provide references for blending decisions to a certain extent, there is a lack of a comprehensive and scientific comprehensive evaluation system to guide thermal power companies to achieve the optimal blending plan. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above existing problems, the present invention is proposed. Therefore, the present invention provides a method for determining a coal blending scheme for different coal types in a thermal power plant to solve the problems existing in the prior art such as complex coal blending decision making and coal blending scheme not being suitable for the actual operation of the unit.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: In a first aspect, the present invention provides a method for determining a coal blending scheme of different coal types in a thermal power plant, comprising: Obtain coal type data of coal yards and historical operation data of coal handling equipment and coal environmental protection systems; According to the coal type data of the coal yard and the historical operation data of the coal handling equipment and coal environmental protection system, establish the constraints of the minimum calorific value, ignition stability, sulfur content, moisture content and ash content of the mixed coal entering the furnace; Based on the constraints, the blending ratios of different types of coal are determined to obtain multiple coal blending schemes; An objective function is established with the goal of minimizing the comprehensive power supply cost, the objective function values ​​of the multiple coal blending schemes are solved, and based on the objective function values, a final coal blending scheme for the thermal power plant is obtained.

[0007] As a preferred embodiment of the method for determining the coal blending scheme of different coal types in a thermal power plant according to the present invention, the historical operation data of the coal processing equipment and the coal environmental protection system include: The coal processing equipment includes a coal mill and a burner; The coal-fired environmental protection system includes a desulfurization system, a denitrification system, and a dust removal system.

[0008] As a preferred embodiment of the method for determining the coal blending scheme of different coal types in a thermal power plant according to the present invention, the constraints of the minimum calorific value, ignition stability, sulfur content, moisture content and ash content of the mixed coal entering the furnace include: The constraint condition for 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's power generation power under different loads; 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 constraint condition of sulfur content of mixed coal entering the furnace is that under different loads, the sulfur content of mixed coal entering the furnace is less than or equal to the maximum output of the desulfurization system; the constraint condition of moisture content of mixed coal entering the furnace is that under different loads, the drying output of the coal mill determined by the moisture content of 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 water dew point temperature; The constraint condition for the ash content of the mixed coal entering the furnace is that under different loads, the ash content of the mixed coal entering the furnace is less than or equal to the maximum output of the dust removal system.

[0009] As a preferred embodiment of the method for determining the coal blending scheme of different coal types in a thermal power plant according to the present invention, the method further comprises: The total heat of the mixed coal fed into the furnace is obtained through the maximum output of the coal mill, the blending ratio of the coal and the lower calorific value; The ignition temperature of the mixed coal fed into the furnace is obtained by the volatile matter and ash content of the mixed coal fed into the furnace; The sulfur content of the mixed coal fed into the furnace is obtained by the basic total sulfur received by the mixed coal fed into the furnace and the blending ratio of the coal types; The coal mill drying output is obtained by the coal mill inlet air temperature, the total moisture content of the coal, the coal mill ventilation volume and the blending ratio of the coal; The ash content of the mixed coal entering the furnace is obtained by the basic ash content of the mixed coal entering the furnace and the blending ratio of the coal types.

[0010] As a preferred solution of the method for determining the coal blending scheme of different coal types in a thermal power plant according to the present invention, the maximum output of the coal mill includes: The output history data of the coal mill under different loads are obtained, the historical data are preprocessed and grouped, the maximum output value of each group is obtained, the maximum output values ​​of each group are averaged, and the maximum output of the coal mill is obtained.

[0011] As a preferred embodiment of the method for determining coal blending schemes of different coal types in a thermal power plant according to the present invention, the multiple coal blending schemes are obtained, including: Based on the constraints of the minimum calorific value, ignition stability, sulfur content, moisture content and ash content of the mixed coal entering the furnace, the blending ratio of different types of coal is adjusted to obtain multiple coal blending schemes.

[0012] As a preferred solution of the method for determining the coal blending scheme of different coal types in a thermal power plant according to the present invention, the objective function is established with the goal of minimizing the comprehensive power supply cost, including: The comprehensive power supply cost includes power supply coal consumption, coal cost, environmental protection cost and repair and maintenance cost; The objective function is expressed as: , in, represents the comprehensive power supply cost, represents the coal consumption for power supply, Indicates coal type The unit price of standard coal, represents the denitrification cost, represents the desulfurization cost, Represents the unit maintenance and overhaul cost, Indicates coal type The blending ratio, Indicates the total number of coal types; In a second aspect, the present invention provides a system for determining a coal blending scheme for different types of coal in a thermal power plant, comprising: Data acquisition module, used to obtain coal type data of coal yard and historical operation data of coal handling equipment and coal environmental protection system; The constraint condition establishment module is used to establish the constraint conditions of the minimum calorific value, ignition stability, sulfur content, moisture content and ash content of the mixed coal entering the furnace based on the coal type data of the coal yard and the historical operation data of the coal handling equipment and the coal environmental protection system; A coal blending scheme acquisition module is used to determine the blending ratio of different coal types based on the constraint conditions to obtain multiple coal blending schemes; An objective function establishment module, used to establish an objective function with the lowest comprehensive power supply cost as the goal, and solve the objective function values ​​of the multiple coal blending schemes; The final coal blending scheme acquisition module is used to obtain the final coal blending scheme of the thermal power plant based on the objective function value.

[0013] In a third aspect, the present invention provides a computing device, comprising: Memory and processor; The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions. When the computer executable instructions are executed by the processor, the steps of the method for determining the coal blending scheme of different coal types in a thermal power plant are implemented.

[0014] In a fourth aspect, the present invention provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the method for determining a coal blending scheme for different coal types in a thermal power plant.

[0015] Compared with the prior art, the present invention has the following beneficial effects: the present invention obtains the historical operation data of coal mill, burner, desulfurization system, denitrification system and dust removal system, grasps the operation status of each auxiliary equipment of the unit, and then determines the various constraints of coal blending according to the operation status of the unit equipment, and continuously updates the unit equipment data, so that the coal blending and combustion scheme is more in line with the actual operation status of the unit; the coal blending scheme is obtained by performing big data analysis on historical data, and then the blending ratio of different coal types is obtained by combining coal quality test data and comprehensive power supply cost calculation data, without the need for combustion test, which is simple and easy to operate, and has low cost, avoiding complicated test process, and showing The coal blending process is greatly simplified and the decision-making cost is reduced. The present invention takes the lowest comprehensive power supply cost as the basic principle and determines the best coal blending scheme by comprehensively considering multiple economic indicators such as power supply coal consumption, coal cost, environmental protection cost and overhaul and maintenance cost. It not only improves the blending ratio of economic coal types and reduces the power generation cost, but also enhances the coal flexibility of power plants, so that power plants can better cope with fluctuations in the coal market and improve production and operation difficulties. The coal blending scheme of the present invention optimizes the blending ratio of different coal types, so that low-quality coal that may have been discarded due to quality problems can be effectively utilized, thereby improving resource utilization efficiency and helping to achieve sustainable development of energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them: Figure 1 This is a schematic diagram of the overall process of a method for determining a coal blending scheme for different types of coal in a thermal power plant according to an embodiment of the present invention; Figure 2 A schematic diagram of a general process of a method for determining a coal blending scheme for different types of coal in a thermal power plant according to an embodiment of the present invention; Figure 3 A schematic diagram of the calculated value of the comprehensive power supply cost under different coal blending schemes of the method for determining coal blending schemes of different coal types in a thermal power plant according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0018] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0019] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0020] The present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0021] At the same time, in the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Example 1 Reference Figure 1-2 , which is an embodiment of the present invention, provides a method for determining a coal blending scheme of different coal types in a thermal power plant, comprising: S100: Obtain the coal type data of the coal yard and the historical operation data of the coal handling equipment and coal environmental protection system; Preferably, the coal processing equipment includes a coal mill and a burner; The coal-fired environmental protection system includes desulfurization system, denitrification system and dust removal system; In the embodiment of the present application, the coal type data includes coal type, quantity and coal quality test data, etc.; It should be noted that after successfully obtaining the coal type data and the historical operating data of the pulverizer, burner, desulfurization system, denitrification system and dust removal system, these data will be preprocessed. The data preprocessing process mainly includes data cleaning, that is, removing outliers, correcting errors and filling missing values ​​to ensure that the data is complete and accurate, and unifying the coal type category coding so that it can be directly used in subsequent analysis and evaluation of coal type reference combustion ratio, equipment operating efficiency and environmental protection system performance.

[0024] S102: Based on the coal type data of the coal yard and the historical operation data of the coal handling equipment and the coal environmental protection system, establish a coal blending plan for the minimum calorific value, ignition stability, sulfur content, and moisture content of the mixed coal entering the furnace; 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 power generation power of the unit 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 coal and the lower calorific value; 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: , in, Indicates the maximum output of the coal mill, in t / h. Indicates coal type The lower calorific value is in MJ / kg. Indicates the blending ratio of coal type i, in %, Indicates boiler heat load in MW. Indicates the generating capacity of the unit, in MW. Indicates the total number of coal types; Preferably, obtaining the maximum output of the coal mill includes obtaining historical output data 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, and obtaining the maximum output of the coal mill; Specifically, in order to accurately evaluate the maximum output of the coal mill, the historical output data of the coal mill under different load conditions were first collected, and the data were cleaned to eliminate outliers and erroneous records to ensure the accuracy and reliability of the data; the cleaned data were grouped according to load size, and each group represented a specific load range; for each load group, all data points in the range were deeply analyzed to obtain the maximum output value that the group of coal mills can achieve, and to obtain the performance limit of the coal mill under different load levels; the maximum output values ​​of all load groups were averaged, and the averaging process helped to balance the performance differences of each load grouping, providing a comprehensive perspective for the performance evaluation of the coal mill; through the above preprocessing and grouping analysis methods, the maximum output of the coal mill was successfully obtained, providing data support for the subsequent acquisition of the reference combustion ratio of coal types.

[0025] 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 by the volatile matter and ash content of the mixed coal entering the furnace; In the embodiment of the present application, the ignition stability constraint condition of the mixed coal fed into the furnace is expressed as: , in, Indicates the ignition temperature of the mixed coal entering the furnace, in °C. Indicates the minimum ignition temperature required by the burner under different loads, in degrees Celsius. Indicates the generating power of the unit, in MW; In the embodiment of the present application, the calculation formula for the ignition temperature of the mixed coal entering the furnace is: , in, Indicates the ignition temperature of the mixed coal entering the furnace, in °C. Indicates coal type Volatile matter on a dry ash-free basis, expressed in %, Indicates coal type Ash content on dry basis, in %, Indicates coal type Air-dried basis moisture, in %, Indicates coal type The blending ratio, unit is %, Indicates the total number of coal types; 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 by the basic total sulfur received by the mixed coal entering the furnace and the blending ratio of the coal type; In the embodiment of the present application, the constraint condition of the sulfur content of the mixed coal entering the furnace is expressed as: , in, Indicates the sulfur content of mixed coal entering the furnace, in %, Indicates the maximum output of the coal mill, in t / h. Indicates the maximum output of the desulfurization system, in t / h; In the embodiment of the present application, the sulfur content of the mixed coal entering the furnace is calculated as follows: , in, Indicates the sulfur content of mixed coal entering the furnace, in %, Indicates the total sulfur content of coal type i, in %, Indicates coal type The lower calorific value is in MJ / kg. Indicates coal type The blending ratio, unit is %, Indicates the total number of coal types; Preferably, the constraint condition of the moisture content of the mixed coal entering 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 air temperature at the outlet of the coal mill is higher than the water dew point temperature; the drying output of the coal mill is obtained by the air temperature at the inlet of the coal mill, the total moisture content of the coal type, the ventilation volume of the coal mill and the blending ratio of the coal type; In the embodiment of the present application, the constraint condition of the moisture content of the mixed coal entering the furnace is expressed as: , , in, Indicates the coal mill inlet air temperature, in °C. Indicates the outlet air temperature of the coal mill, in °C. Indicates coal type Total moisture content, in %, Indicates the ventilation volume of the coal mill in t / h. Indicates the water dew point temperature in °C. Indicates the maximum output of the coal mill, in t / h. Indicates coal type The blending ratio, unit is %, Indicates the total number of coal types; Preferably, 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 the maximum output of the dust removal system under different loads; the ash content of the mixed coal entering the furnace is obtained by the basic ash content of the mixed coal entering the furnace and the blending ratio of the coal type; In the embodiment of the present application, the constraint condition of the ash content of the mixed coal entering the furnace is expressed as: , in, Indicates the ash content of mixed coal entering the furnace, in %, Indicates the maximum output of the dust removal system in t / h. Indicates the maximum output of the coal mill, in t / h; In the embodiment of the present application, the calculation formula for the ash content of the mixed coal entering the furnace is: , in, Indicates the ash content of mixed coal entering the furnace, in %, Indicates coal type The received basis ash content, unit is %, Indicates coal type The blending ratio, unit is %, Indicates the total number of coal types; It should be noted that the core of the present invention is to establish a series of scientific and precise constraints to optimize the coal blending plan of the thermal power plant. The establishment of these constraints ensures that the thermal power plant can achieve efficient energy utilization and significantly improve economic benefits under different loads by accurately calculating the balance between the maximum output of the coal mill and the thermal load of the boiler; the present invention effectively controls the pollutant content of the mixed coal entering the furnace by setting the constraints of sulfur and ash content, ensures that the desulfurization system and the dust removal system can operate efficiently, thereby greatly reducing the emission of sulfur dioxide and dust, and making a positive contribution to environmental protection and sustainable development; taking into account the operating efficiency of the coal mill, the present invention analyzes in detail the influencing factors of the drying output of the coal mill, and determines a reasonable blending ratio accordingly, so that the coal mill can maintain a high operating efficiency under different loads, reduces wear and maintenance costs, and extends the service life of the equipment.

[0026] S104: Based on constraint conditions, determine the blending ratio of different coal types to obtain multiple coal blending schemes; Preferably, based on the constraints of the minimum calorific value, ignition stability, sulfur content, moisture content and ash content of the mixed coal entering the furnace, the blending ratio of different types of coal is adjusted to obtain multiple coal blending schemes; It should also be noted that, under various constraints, the present invention generates multiple optimized coal blending schemes by flexibly adjusting the coal blending ratio. These schemes not only provide thermal power plants with diversified choices to cope with risks such as coal price fluctuations and unstable supply, but also promote technological innovation and improve boiler thermal efficiency and overall operational efficiency. The existence of multiple schemes enhances the scientificity and rationality of decision-making, and provides a basis for subsequent acquisition of the best scheme, which also provides strong support for thermal power plants to achieve both economic and environmental benefits.

[0027] S106: establishing an objective function with the goal of minimizing the comprehensive power supply cost, solving the objective function values ​​of multiple coal blending schemes, and obtaining the final coal blending scheme of the thermal power plant based on the objective function values; Preferably, the comprehensive power supply cost includes power supply coal consumption, coal cost, environmental protection cost and repair and maintenance cost; The objective function is expressed as: , in, represents the comprehensive power supply cost, represents the coal consumption for power supply, Indicates coal type The unit price of standard coal, represents the denitrification cost, represents the desulfurization cost, Represents the unit maintenance and overhaul cost, Indicates coal type The blending ratio, Indicates the total number of coal types; In the embodiment 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"; It should be noted that taking the lowest comprehensive power supply cost as the goal, establishing the objective function and solving the objective function values ​​under multiple coal blending schemes are the key steps of the present invention in optimizing the coal blending scheme of thermal power plants. By comprehensively considering the coal consumption for power supply, coal cost, environmental protection cost and unit maintenance and overhaul cost, the present invention can comprehensively evaluate the economy and environmental protection of different coal blending schemes. The significant beneficial effect of the present invention is that it can ensure that the thermal 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 thermal power plant and enhance its market competitiveness, but also promotes the rational use of resources and reduces unnecessary waste. Since environmental protection costs are included in the objective function, thermal power plants can better fulfill their environmental protection responsibilities while pursuing economic benefits, thereby achieving a win-win situation of economic and environmental benefits.

[0028] The above is a schematic scheme of a method for determining a coal blending scheme of different coal types in a thermal power plant in this embodiment. It should be noted that the technical scheme of the system for determining a coal blending scheme of different coal types in a thermal power plant and the technical scheme of the method for determining a coal blending scheme of different coal types in a thermal power plant described above belong to the same concept. For details not described in detail in the technical scheme of the system for determining a coal blending scheme of different coal types in a thermal power plant in this embodiment, please refer to the description of the technical scheme of the method for determining a coal blending scheme of different coal types in a thermal power plant described above.

[0029] The system for determining the coal blending scheme of different coal types in a thermal power plant in this embodiment includes: Data acquisition module, used to obtain coal type data of coal yard and historical operation data of coal handling equipment and coal environmental protection system; The constraint condition establishment module is used to establish the constraint conditions of the minimum calorific value, ignition stability, sulfur content, moisture content and ash content of the mixed coal entering the furnace based on the coal type data of the coal yard and the historical operation data of the coal handling equipment and the coal environmental protection system; A coal blending scheme acquisition module is used to determine the blending ratio of different coal types based on constraint conditions to obtain multiple coal blending schemes; The objective function establishment module is used to establish the objective function with the lowest comprehensive power supply cost as the goal and solve the objective function values ​​of multiple coal blending schemes; The final coal blending scheme acquisition module is used to obtain the final coal blending scheme of the thermal power plant based on the objective function value.

[0030] This embodiment also provides a computing device, which is suitable for determining the coal blending scheme of different coal types in a thermal power plant, including: A memory and a processor; the memory is used to store computer executable instructions, and the processor is used to execute computer executable instructions to implement the method for determining the coal blending scheme of different coal types in a thermal power plant as proposed in the above embodiment.

[0031] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the method for determining a coal blending scheme for different coal types in a thermal power plant as proposed in the above embodiment is implemented.

[0032] The storage medium proposed in this embodiment and the method for determining the coal blending scheme of different coal types in a thermal power plant proposed in the above embodiment belong to the same inventive concept. The technical details not described in detail in this embodiment can be referred to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0033] Through the above description of the implementation methods, the technicians in the relevant field can clearly understand that the present invention can be implemented by means of software and necessary general hardware, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer's floppy disk, read-only memory (ReadOnly, Memory, ROM), random access memory (RandomAccess Memory, RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform the methods of various embodiments of the present invention.

[0034] Example 2 Reference Figure 3 Tables 1-2 and 1-3 are an embodiment of the present invention, which provide a method for determining a coal blending scheme for different coal types in a thermal power plant. In order to verify its beneficial effects, the results of several coal blending schemes are provided.

[0035] Obtain the coal quality test data of all the coal types stored in the coal yard, as shown in Table 1; Table 1 Coal quality test data Coal Type Total moisture Mt (%) Ash content received Aar (%) <![CDATA[Dry ash-free basis volatile matter V daf (%)]]> <![CDATA[Received base total sulfur S t,ar (%)]]> <![CDATA[Lower calorific value Q net,ar (MJ / kg)]]> Coal 1 44.5 22.73 38.84 0.37 8849.4 Coal 2 40.6 16.41 56.00 0.58 10374 Coal 3 10.9 47.39 33.38 2.04 11982.6 Coal 4 10.0 37.19 21.09 1.51 16926 Coal 5 17.2 3.69 37.81 0.32 25321.8 The historical operation data of coal mill, burner, desulfurization system, denitrification system and dust removal system are obtained, and the minimum calorific value, ignition stability, sulfur content, moisture content and ash content of mixed coal entering the furnace are determined according to the coal quality test data and the historical operation data of the unit, as shown in Table 2: Table 2 Coal blending constraint indicators established for a certain unit load MW 160 220 260 300 Mt % ≦33 ≦25 ≦18 ≦12 <![CDATA[V daf ]]> % ≧30 ≧28 ≧27 ≧27 <![CDATA[Q net,ar ]]> MJ / kg ≧11760 ≧13440 ≧15120 ≧16380 <![CDATA[S t,ar ]]> % ≦1.45 ≦1.44 ≦1.40 ≦1.40 Aar % ≦25 ≦20 ≦18 ≦15 According to the constraint indicators in Table 1 and Table 2 and the coal stored in the coal yard, the blending ratio of coal types 1 to 5 is calculated, as follows: Figure 3 As shown in the figure, three coal blending schemes for a unit under 100% load are obtained, and the comprehensive power supply cost of the unit under different coal blending schemes is calculated = coal cost + environmental protection cost. The environmental protection cost includes denitrification cost, desulfurization cost and unit maintenance and repair cost. The coal blending scheme with the lowest comprehensive power supply cost is selected as the best coal blending scheme, and the blending ratio of different coal types is determined. Figure 3 For example, the comprehensive power supply cost of the unit corresponding to coal blending scheme 1 is the smallest, so coal blending scheme 1 is selected as the best coal blending scheme; In summary, the present invention successfully realizes the optimal selection of coal blending schemes for thermal power plants by comprehensively using coal quality test data, historical operation data of units and various constraints. It not only provides a scientific and reasonable coal blending scheme for thermal power plants, but also provides strong support for reducing operating costs and improving environmental protection performance.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for determining a coal blending scheme for different types of coal in a thermal power plant, characterized in that: include: Obtain coal type data of coal yards and historical operation data of coal handling equipment and coal environmental protection systems; According to the coal type data of the coal yard and the historical operation data of the coal handling equipment and coal environmental protection system, establish the constraints of the minimum calorific value, ignition stability, sulfur content, moisture content and ash content of the mixed coal entering the furnace; Based on the constraints, the blending ratios of different types of coal are determined to obtain multiple coal blending schemes; An objective function is established with the goal of minimizing the comprehensive power supply cost, the objective function values ​​of the multiple coal blending schemes are solved, and based on the objective function values, a final coal blending scheme for the thermal power plant is obtained.

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

3. The method for determining the coal blending scheme of different coal types in a thermal power plant according to claim 1, characterized in that: The constraints of the minimum calorific value, ignition stability, sulfur content, moisture content and ash content of the mixed coal entering the furnace include: The constraint condition for 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's power generation power under different loads; 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 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 constraint condition of the moisture content of the mixed coal entering 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 air temperature at the outlet of the coal mill is higher than the water dew point temperature; The constraint condition for the ash content of the mixed coal entering the furnace is that under different loads, the ash content of the mixed coal entering the furnace is less than or equal to the maximum output of the dust removal system.

4. The method for determining the coal blending scheme of different coal types in a thermal power plant according to claim 3, characterized in that: Also includes, The total heat of the mixed coal fed into the furnace is obtained through the maximum output of the coal mill, the blending ratio of the coal and the lower calorific value; The ignition temperature of the mixed coal fed into the furnace is obtained by the volatile matter and ash content of the mixed coal fed into the furnace; The sulfur content of the mixed coal fed into the furnace is obtained by the basic total sulfur received by the mixed coal fed into the furnace and the blending ratio of the coal types; The coal mill drying output is obtained by the coal mill inlet air temperature, the total moisture content of the coal, the coal mill ventilation volume and the blending ratio of the coal; The ash content of the mixed coal entering the furnace is obtained by the basic ash content of the mixed coal entering the furnace and the blending ratio of the coal types.

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 coal mill includes: The output history data of the coal mill under different loads are obtained, the historical data are preprocessed and grouped, the maximum output value of each group is obtained, the maximum output values ​​of each group are averaged, and the maximum output of the coal mill is obtained.

6. The method for determining the coal blending scheme of different coal types in a thermal power plant according to claim 1, characterized in that: Get multiple coal blending solutions including, Based on the constraints of the minimum calorific value, ignition stability, sulfur content, moisture content and ash content of the mixed coal entering the furnace, the blending ratio of different types of coal is adjusted to obtain multiple coal blending schemes.

7. The method for determining the coal blending scheme of different coal types in a thermal power plant according to claim 1, characterized in that: The objective function is established with the goal of minimizing the comprehensive power supply cost, including: The comprehensive power supply cost includes power supply coal consumption, coal cost, environmental protection cost and repair and maintenance cost; The objective function is expressed as: ， in, represents the comprehensive power supply cost, Indicates the coal consumption for power supply, Indicates coal type The unit price of standard coal, represents the denitrification cost, represents the desulfurization cost, Represents the unit maintenance and overhaul cost, Indicates coal type The blending ratio, Indicates the total number of coal types.

8. A system for determining the coal blending scheme of different coal types in a thermal power plant, characterized in that: include, Data acquisition module, used to obtain coal type data of coal yard and historical operation data of coal handling equipment and coal environmental protection system; The constraint condition establishment module is used to establish the constraint conditions of the minimum calorific value, ignition stability, sulfur content, moisture content and ash content of the mixed coal entering the furnace based on the coal type data of the coal yard and the historical operation data of the coal handling equipment and the coal environmental protection system; A coal blending scheme acquisition module is used to determine the blending ratio of different coal types based on the constraint conditions to obtain multiple coal blending schemes; An objective function establishment module, used to establish an objective function with the lowest comprehensive power supply cost as the goal, and solve the objective function values ​​of the multiple coal blending schemes; The final coal blending scheme acquisition module is used to obtain the final coal blending scheme of the thermal power plant based on the objective function value.

9. An electronic device, comprising: Memory and processor; The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions. When the computer executable instructions are executed by the processor, the steps of the method for determining the coal blending scheme of different coal types in a thermal power plant as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the method for determining a coal blending scheme for different coal types in a thermal power plant as described in any one of claims 1 to 7.

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