A method for optimizing coal blending and combustion

Abstract

The present invention provides a method for optimizing coal blending and combustion, belonging to the field of coal-fired power generation. The method includes the following steps: a unit parameter information monitoring process; a process for obtaining inventory information of various blended coals; a process for obtaining basic information; a process for generating a mathematical model; a process for optimizing the blending ratio of various blended coals; obtaining the unit environmental protection parameters of the coal-fired generator set in real time when the coal-fired generator set is in operation; and obtaining the unit load of the coal-fired generator set in real time when the coal-fired generator set is in operation. The method for optimizing coal blending and combustion can analyze the corresponding relationship between unit load and coal quantity under different units and different coal qualities, and analyze the optimal coal blending and combustion scheme based on variables such as the sulfur content of the incoming coal, the minimum calorific value requirement, the equipment status, the load, and the ambient temperature under different operating conditions, thereby avoiding the situation where the unit load is restricted due to exceeding the environmental protection parameter standard, significantly improving the economic benefits of blending and combustion, and reducing the processing costs of coal-fired power plants.

Description

Technical Field

[0001] The present invention relates to the field of coal-fired power generation, and in particular to a method for optimizing coal blending and combustion. Background Art

[0002] Fuel costs are the largest component of coal-fired power plant electricity generation costs, and as the marketization of power coal deepens, fuel costs are becoming an increasingly significant component of power generation costs. This includes a three-to-five year plan to phase out 500 million tons of coal production and reduce and restructure 500 million tons. The decline in coal supply has caused its price to rise annually since mid-2016. This is especially true with increasing environmental protection requirements, which require strict control of the three major flue gas pollutants—sulfur dioxide, nitrogen oxides, and dust—to meet emission standards, preventing both instantaneous and hourly average exceeding of standards. As a result, the price of the coal primarily used by coal-fired power plants has continued to rise.

[0003] Therefore, to balance fuel costs, coal-fired power plants are gradually developing coal blending and combustion technologies. While ensuring safe and environmentally friendly unit operation, these plants blend coal with relatively low-cost, high-sulfur coal, or relatively low-calorific value coal, to dilute the fuel bill of incoming coal and minimize the increase in power generation costs caused by rising coal prices. Consequently, coal blending and combustion management are becoming increasingly important in coal-fired power plants, even becoming the most important management and control measure for some plants.

[0004] The existing coal blending and combustion technology is based entirely on past experience and has not formed a complete and scientific blending plan. The consequences are either limiting the unit load due to exceeding environmental protection parameters, or affecting the economic benefits of blending and combustion because the blending rate does not reach the upper limit. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method for optimizing coal blending and combustion to solve the problem that the existing blending is based entirely on past experience, resulting in environmental protection parameters exceeding the standard and limiting the unit load, or the blending rate does not reach the upper limit, affecting the economic benefits of blending and combustion.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A method for optimizing coal blending and combustion, comprising the following steps:

[0008] S1. Unit parameter information monitoring process;

[0009] S2. Process for obtaining inventory information of various blended coals;

[0010] S3, basic information acquisition process;

[0011] S4, mathematical model generation process;

[0012] S5. Optimization process of blending ratio of various blended coals.

[0013] Preferably, the unit parameter information monitoring process for collecting unit parameter information includes the following steps:

[0014] S101. When the coal-fired power generation unit is in operation, obtain the environmental protection parameters of the coal-fired power generation unit in real time;

[0015] S102. When the coal-fired power generation unit is running, obtaining the unit load of the coal-fired power generation unit in real time;

[0016] S103. While the coal-fired power generation unit is in operation, obtaining the dust removal and ash transport capacity of the coal-fired power generation unit in real time;

[0017] S104. When the coal-fired power generation unit is in operation, the desulfurization tolerance of the coal-fired power generation unit is obtained in real time, and the desulfurization tolerance of the unit is summarized and sent to the mathematical model terminal together with the environmental protection parameters of the unit, the unit load, and the dust removal and ash transport tolerance.

[0018] Preferably, the process for acquiring the inventory information of multiple blended coals for collecting the inventory information of multiple blended coals on the day includes the following steps:

[0019] S201. Obtain yesterday's inventory of high-sulfur coal and today's newly added coal quantity to obtain today's inventory information of high-sulfur coal;

[0020] S202: Obtain yesterday's inventory of low-value coal and today's newly added coal to obtain today's inventory information of low-value coal;

[0021] S203. By obtaining yesterday's production volume and the blending ratio of the blended coal, and combining it with today's production volume, the amount of coal required for production is calculated, so that when blending the blended coal, the blending ratio is adjusted according to the inventory information of high-sulfur coal and low-value coal.

[0022] Preferably, the basic information acquisition process for collecting various basic information of the day includes the following steps:

[0023] S301. Obtain relevant data on combustion materials of the coal-fired power generation unit through a basic factor parameter acquisition process;

[0024] S302. Then, obtain relevant data of the equipment during combustion of the coal-fired power generation unit through the equipment factor parameter acquisition process.

[0025] Preferably, the basic factor parameter acquisition process for obtaining relevant data of the combustion material of the coal-fired power generation unit includes the following steps:

[0026] S30101. Obtain the coal quality parameters of the coal-fired generator during combustion, and store and register them;

[0027] S30102. Obtain and record quality parameter information of limestone slurry during combustion of a coal-fired generator;

[0028] S30103. Obtain information on seasonal influencing factors during coal combustion, and summarize it together with the coal quality parameters of the incoming coal and the limestone slurry quality parameters and send it to the mathematical model terminal.

[0029] Preferably, the process for obtaining equipment factor parameters for obtaining equipment-related data during combustion of a coal-fired power generation unit includes the following steps:

[0030] S30201. Obtaining the operation mode of the pulverizing system during combustion of the coal-fired generator;

[0031] S30202. Obtaining the operation mode of the desulfurization system during combustion of the coal-fired generator;

[0032] S30203. Obtain load changes of the coal-fired generator unit during combustion and generate a load change trend;

[0033] S30204. Obtain the operation mode of the dust removal and ash conveying system during combustion of the coal-fired generator;

[0034] S30205, obtaining the operating status of the boiler slag removal system when the coal-fired generator is burning;

[0035] S30206. Obtain the operating mode of the coal conveying system when the coal-fired generator is burning, and summarize the operating modes of the coal conveying system, pulverizing system, desulfurization system, dust removal and ash conveying system, and boiler slag removal system together with the unit load change trend and send them to the mathematical model terminal.

[0036] Preferably, the mathematical model generation process for generating the mathematical model includes the following steps:

[0037] S401, obtaining the unit desulfurization tolerance, unit environmental protection parameters, unit load, and dust removal and ash handling tolerance information, so as to monitor the unit's working condition in real time during coal blending and combustion;

[0038] S402. Obtaining the daily inventory information of high-sulfur coal and low-value coal to adjust the blending ratio according to the inventory of high-sulfur coal and low-value coal;

[0039] S403, obtaining information on seasonal factors affecting coal combustion, coal quality parameters of the incoming coal, and limestone slurry quality parameters to analyze the calorific value and sulfur value of the heat dissipation material;

[0040] S404. Obtain the operating modes of the coal conveying system, pulverizing system, desulfurization system, dust removal and ash conveying system, and boiler slag removal system during combustion of the coal-fired generator, and then obtain the load change trend of the unit to analyze the various blended coal combustion rates under the current conditions.

[0041] Preferably, the multiple blending coal blending ratio optimization process for optimizing the blending ratio of multiple blending coals includes the following steps:

[0042] S501. By obtaining the desulfurization capacity information of the desulfurization absorption tower, and then obtaining the unit load data and the calorific value of the incoming coal, the weighted sulfur content of the incoming coal is analyzed, thereby adjusting the blending ratio of the high-sulfur coal;

[0043] S502. By adding a spare slurry circulation pump, the normal "three in operation and one in standby" operation mode is changed to four pumps operating simultaneously, thereby improving the sulfur treatment capacity of the absorption tower;

[0044] S503. By analyzing the combustion calorific value of the low-value coal, the blending ratio of the low-value coal can be analyzed to ensure the unit load and maintain safe and stable combustion of the boiler.

[0045] Compared with the prior art, the present invention has at least the following beneficial effects:

[0046] In the above scheme, by obtaining the desulfurization tolerance, environmental protection parameters, load and dust removal and ash handling tolerance information of the coal-fired power generation unit, the working condition of the unit is monitored in real time during coal blending and combustion, and then the inventory information of high-sulfur coal and low-value coal on the same day is obtained to adjust the blending ratio according to the inventory of high-sulfur coal and low-value coal. Then, the seasonal influencing factors of coal combustion of the coal-fired power generation unit, the coal quality parameters of the coal entering the furnace, the quality parameters of the limestone slurry and the operating modes of the coal conveying system, the pulverizing system, the desulfurization system, the dust removal and ash handling system and the boiler slag removal system are obtained. Then, the load change trend of the unit is obtained, that is, a mathematical model terminal is generated to analyze the various blending coal combustion rates under the current conditions. Compared with the manual preparation of the blending scheme based on experience, the blending efficiency is greatly improved, the situation of limiting the unit load due to exceeding the environmental protection parameters is avoided, and the situation of affecting the economic benefits of blending and combustion due to the blending rate not reaching the upper limit is avoided, which greatly reduces the processing cost of the coal-fired power plant.

[0047] Through the unit parameter information monitoring process, the process for obtaining information on the inventory of various blended coals, and the process for obtaining basic information, sufficient information on the blended coal and the unit can be obtained, thereby monitoring the unit's environmental parameters and unit load, as well as information on dust removal, ash conveying, and desulfurization capacity in real time. This allows staff to intuitively observe the unit's operating conditions and facilitate timely changes to the coal blending and combustion plan.

[0048] Through the optimization process of various blending coal blending rates, the blending ratio of high-sulfur coal to low-value coal can be analyzed. In addition, by adding spare slurry circulation pumps, the slurry circulation pumps are operated in a different mode from the normal "three in operation and one in standby" mode to four pumps operating simultaneously, in order to improve the absorption tower's sulfur processing capacity and thus minimize fuel costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 A schematic diagram of the steps for optimizing the coal blending and combustion method;

[0050] Figure 2 A schematic block diagram of the steps of the unit parameter information monitoring process;

[0051] Figure 3 A schematic diagram of the steps in the process of obtaining inventory information of various blended coals;

[0052] Figure 4 A schematic diagram of the steps in the basic information acquisition process;

[0053] Figure 5 A schematic diagram of the steps in the process of generating a mathematical model;

[0054] Figure 6 This is a schematic diagram of the steps in the process of optimizing the blending ratio of various blending coals. DETAILED DESCRIPTION

[0055] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0056] An embodiment of the present invention provides a method for optimizing coal blending and combustion, comprising the following steps:

[0057] S1. Unit parameter information monitoring process;

[0058] S2. Process for obtaining inventory information of various blended coals;

[0059] S3, basic information acquisition process;

[0060] S4, mathematical model generation process;

[0061] S5. Optimization process of blending ratio of various blended coals.

[0062] Furthermore, the unit parameter information monitoring process for collecting unit parameter information includes the following steps:

[0063] S101. When the coal-fired power generation unit is in operation, obtain the environmental protection parameters of the coal-fired power generation unit in real time;

[0064] S102. When the coal-fired power generation unit is running, obtaining the unit load of the coal-fired power generation unit in real time;

[0065] S103. While the coal-fired power generation unit is in operation, obtaining the dust removal and ash transport capacity of the coal-fired power generation unit in real time;

[0066] S104. When the coal-fired power generation unit is in operation, the desulfurization tolerance of the coal-fired power generation unit is obtained in real time, and the desulfurization tolerance of the unit is summarized and sent to the mathematical model terminal together with the environmental protection parameters of the unit, the unit load, and the dust removal and ash transport tolerance.

[0067] Furthermore, the process for acquiring the inventory information of multiple blended coals for collecting the inventory information of multiple blended coals on the day includes the following steps:

[0068] S201. Obtain yesterday's inventory of high-sulfur coal and today's newly added coal quantity to obtain today's inventory information of high-sulfur coal;

[0069] S202: Obtain yesterday's inventory of low-value coal and today's newly added coal to obtain today's inventory information of low-value coal;

[0070] S203. By obtaining yesterday's production volume and the blending ratio of the blended coal, and combining it with today's production volume, the amount of coal required for production is calculated, so that when blending the blended coal, the blending ratio is adjusted according to the inventory information of high-sulfur coal and low-value coal.

[0071] Furthermore, the basic information acquisition process for collecting various basic information of the day includes the following steps:

[0072] S301. Obtain relevant data on combustion materials of the coal-fired power generation unit through a basic factor parameter acquisition process;

[0073] S302. Then, obtain relevant data of the equipment during combustion of the coal-fired power generation unit through the equipment factor parameter acquisition process.

[0074] Furthermore, the basic factor parameter acquisition process for obtaining relevant data of the combustion materials of the coal-fired power generation unit includes the following steps:

[0075] S30101. Obtain the coal quality parameters of the coal-fired generator during combustion, and store and register them;

[0076] S30102. Obtain and record quality parameter information of limestone slurry during combustion of a coal-fired generator;

[0077] S30103. Obtain information on seasonal influencing factors during coal combustion, and summarize it together with the coal quality parameters of the incoming coal and the limestone slurry quality parameters and send it to the mathematical model terminal.

[0078] Furthermore, the process for obtaining equipment factor parameters for obtaining equipment-related data during combustion of a coal-fired power generation unit includes the following steps:

[0079] S30201. Obtaining the operation mode of the pulverizing system during combustion of the coal-fired generator;

[0080] S30202. Obtaining the operation mode of the desulfurization system during combustion of the coal-fired generator;

[0081] S30203. Obtain load changes of the coal-fired generator unit during combustion and generate a load change trend;

[0082] S30204. Obtain the operation mode of the dust removal and ash conveying system during combustion of the coal-fired generator;

[0083] S30205, obtaining the operating status of the boiler slag removal system when the coal-fired generator is burning;

[0084] S30206. Obtain the operating mode of the coal conveying system when the coal-fired generator is burning, and summarize the operating modes of the coal conveying system, pulverizing system, desulfurization system, dust removal and ash conveying system, and boiler slag removal system together with the unit load change trend and send them to the mathematical model terminal.

[0085] Furthermore, the mathematical model generation process for generating the mathematical model includes the following steps:

[0086] S401, obtaining the unit desulfurization tolerance, unit environmental protection parameters, unit load, and dust removal and ash handling tolerance information, so as to monitor the unit's working condition in real time during coal blending and combustion;

[0087] S402. Obtaining the daily inventory information of high-sulfur coal and low-value coal to adjust the blending ratio according to the inventory of high-sulfur coal and low-value coal;

[0088] S403, obtaining information on seasonal factors affecting coal combustion, coal quality parameters of the incoming coal, and limestone slurry quality parameters to analyze the calorific value and sulfur value of the heat dissipation material;

[0089] S404. Obtain the operating modes of the coal conveying system, pulverizing system, desulfurization system, dust removal and ash conveying system, and boiler slag removal system during combustion of the coal-fired generator, and then obtain the load change trend of the unit to analyze the various blended coal combustion rates under the current conditions.

[0090] Furthermore, a multi-blending coal blending ratio optimization process for optimizing the blending ratio of the multi-blending coals includes the following steps:

[0091] S501. By obtaining the desulfurization capacity information of the desulfurization absorption tower, and then obtaining the unit load data and the calorific value of the incoming coal, the weighted sulfur content of the incoming coal is analyzed, thereby adjusting the blending ratio of the high-sulfur coal;

[0092] S502. By adding a spare slurry circulation pump, the normal "three in operation and one in standby" operation mode is changed to four pumps operating simultaneously, thereby improving the sulfur treatment capacity of the absorption tower;

[0093] S503. By analyzing the combustion calorific value of the low-value coal, the blending ratio of the low-value coal can be analyzed to ensure the unit load and maintain safe and stable combustion of the boiler.

[0094] The technical solution provided by the present invention obtains the desulfurization tolerance, environmental protection parameters, load and dust removal and ash handling tolerance information of the coal-fired power generation unit, thereby monitoring the working status of the unit in real time during coal blending and combustion, and then obtains the daily inventory information of high-sulfur coal and low-value coal to adjust the blending ratio according to the inventory of high-sulfur coal and low-value coal, and then obtains the seasonal influencing factor information of the coal combustion of the coal-fired power generation unit, the coal quality parameters of the coal entering the furnace, the quality parameters of the limestone slurry and the operating mode of the coal conveying system, the pulverizing system, the desulfurization system, the dust removal and ash handling system and the boiler slag removal system, and then obtains the load change trend of the unit, that is, generates a mathematical model terminal to analyze the various blending coal combustion rates under the current conditions. Compared with the manual preparation of the blending scheme based on experience, the blending efficiency is greatly improved, the situation of limiting the unit load due to exceeding the environmental protection parameters is avoided, and the situation of affecting the economic benefits of blending and combustion due to the blending rate not reaching the upper limit is avoided, thereby greatly reducing the processing cost of the coal-fired power plant;

[0095] Through the unit parameter information monitoring process, the process for obtaining information on the inventory of various blended coals, and the process for obtaining basic information, sufficient information on the blended coal and the unit can be obtained, thereby monitoring the unit's environmental parameters and unit load, as well as information on dust removal, ash conveying, and desulfurization capacity in real time. This allows staff to intuitively observe the unit's operating conditions and facilitate timely changes to the coal blending and combustion plan.

[0096] Through the optimization process of various blending coal blending ratios, the blending ratio of high-sulfur coal to low-value coal can be analyzed. In addition, by adding spare slurry circulation pumps, the slurry circulation pumps are changed from the normal "three in operation and one in standby" operation mode to four units running simultaneously, in order to improve the absorption tower's sulfur processing capacity, thereby minimizing fuel costs.

[0097] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for optimizing coal blending and combustion, characterized in that: The following steps are involved: S1. Unit parameter information monitoring process; S2. Process for obtaining inventory information of various blended coals; S3, basic information acquisition process; S4, mathematical model generation process; S5. Optimization process of blending ratio of various blended coals; The mathematical model generation process for generating a mathematical model includes the following steps: S401, obtaining the unit desulfurization tolerance, unit environmental protection parameters, unit load, and dust removal and ash handling tolerance information obtained in step S1, so as to monitor the unit's operating status in real time during coal blending and combustion; S402: Obtain the daily inventory information of the high-sulfur coal and the low-value coal obtained in step S2, and adjust the blending ratio according to the inventory of the high-sulfur coal and the low-value coal; S403, obtaining the seasonal influencing factor information of coal combustion obtained in step S3, the coal quality parameters of the incoming coal, and the quality parameters of the limestone slurry to analyze the calorific value and sulfur value of the heat dissipation material; S404: Obtain the operating modes of the coal conveying system, pulverizing system, desulfurization system, dust removal and ash conveying system, and boiler slag removal system during combustion of the coal-fired generator obtained in step S3, and then obtain the load change trend of the unit, that is, generate a mathematical model terminal to analyze the various blending coal combustion rates under the current conditions; The process for optimizing the blending ratio of multiple blending coals includes the following steps: S501. By obtaining the desulfurization capacity information of the desulfurization absorption tower, and then obtaining the unit load data and the calorific value of the incoming coal, the weighted sulfur content of the incoming coal is analyzed, thereby adjusting the blending ratio of the high-sulfur coal; S502. By adding a spare slurry circulation pump, the normal "three in operation and one in standby" operation mode is changed to four pumps operating simultaneously, thereby improving the sulfur treatment capacity of the absorption tower; S503. By analyzing the combustion calorific value of the low-value coal, the blending ratio of the low-value coal can be analyzed to ensure the unit load and maintain safe and stable combustion of the boiler.

2. The method for optimizing coal blending and combustion according to claim 1, characterized in that: The unit parameter information monitoring process for collecting unit parameter information includes the following steps: S101. When the coal-fired power generation unit is in operation, obtain the environmental protection parameters of the coal-fired power generation unit in real time; S102. When the coal-fired power generation unit is running, obtaining the unit load of the coal-fired power generation unit in real time; S103. While the coal-fired power generation unit is in operation, obtaining the dust removal and ash transport capacity of the coal-fired power generation unit in real time; S104. When the coal-fired power generation unit is in operation, the desulfurization tolerance of the coal-fired power generation unit is obtained in real time, and the desulfurization tolerance of the unit is summarized and sent to the mathematical model terminal together with the environmental protection parameters of the unit, the unit load, and the dust removal and ash transport tolerance.

3. The method for optimizing coal blending and combustion according to claim 1, characterized in that: The process for acquiring the inventory information of multiple blended coals for collecting the inventory information of multiple blended coals on the same day includes the following steps: S201. Obtain yesterday's inventory of high-sulfur coal and today's newly added coal quantity to obtain today's inventory information of high-sulfur coal; S202: Obtain yesterday's inventory of low-value coal and today's newly added coal to obtain today's inventory information of low-value coal; S203. By obtaining yesterday's production volume and the blending ratio of the blended coal, and combining it with today's production volume, the amount of coal required for production is calculated, so that when blending the blended coal, the blending ratio is adjusted according to the inventory information of high-sulfur coal and low-value coal.

4. The method for optimizing coal blending and combustion according to claim 1, characterized in that: The basic information acquisition process for collecting various basic information on the day includes the following steps: S301. Obtain relevant data on combustion materials of the coal-fired power generation unit through a basic factor parameter acquisition process; S302. Then, obtain relevant data of the equipment during combustion of the coal-fired power generation unit through the equipment factor parameter acquisition process.

5. The method for optimizing coal blending and combustion according to claim 4, characterized in that: The basic factor parameter acquisition process for obtaining relevant data on combustion materials of coal-fired power generation units includes the following steps: S30101. Obtain the coal quality parameters of the coal-fired generator during combustion, and store and register them; S30102. Obtain and record quality parameter information of limestone slurry during combustion of a coal-fired generator; S30103. Obtain information on seasonal influencing factors during coal combustion, and summarize it together with the coal quality parameters of the incoming coal and the limestone slurry quality parameters and send it to the mathematical model terminal.

6. The method for optimizing coal blending and combustion according to claim 4, characterized in that: The process for obtaining equipment factor parameters for obtaining equipment-related data during combustion of a coal-fired power generation unit includes the following steps: S30201. Obtaining the operation mode of the pulverizing system during combustion of the coal-fired generator; S30202. Obtaining the operation mode of the desulfurization system during combustion of the coal-fired generator; S30203. Obtain load changes of the coal-fired generator unit during combustion and generate a load change trend; S30204. Obtain the operation mode of the dust removal and ash conveying system during combustion of the coal-fired generator; S30205, obtaining the operating status of the boiler slag removal system when the coal-fired generator is burning; S30206. Obtain the operating mode of the coal conveying system when the coal-fired generator is burning, and summarize the operating modes of the coal conveying system, pulverizing system, desulfurization system, dust removal and ash conveying system, and boiler slag removal system together with the unit load change trend and send them to the mathematical model terminal.

Images