Fossil power generation unit coal blending scheme acquisition method

Abstract

The present invention discloses a fossil power generation unit coal blending scheme acquisition method. According to the method, a coal blending ratio is used as a target function; coal blending parameters obtained by calculating mixed coal coal quality parameters and calculating boiler checking heat are used as input quantities; safety and environmental friendliness of unit operation and practical indexes on site are used as constraint conditions; a coal blending ratio digital model which meets all the constraint conditions is established and obtained; and by means of economic analysis, experimental verification, introduction of auxiliary engine power consumption and the like, the coal blending ratio with the optimal economy is selected and an optimal and reliable coal blending scheme is obtained. According to the present invention, various coal blending schemes obtained by model calculation are subjected to economic analysis and the relatively optimal coal blending scheme is selected according to different constraint conditions; the application range of a boiler for coal types can be enlarged; under the condition of ensuring safe and environmental-friendly operation of a unit, flexibility of coal purchase is improved; and production cost of a power plant is effectively reduced.

Description

technical field [0001] The invention relates to a method for obtaining a coal blending scheme of a thermal power unit, and belongs to the technical field of coal blending optimization schemes of a thermal power unit. Background technique [0002] Generally speaking, when the boilers of power plants burn the corresponding design coal or check coal, the unit has the best economy and can operate safely and normally; but the coal supply of power plants is affected by many factors ,like: [0003] (1) The type of coal used is in short supply or the price is high, the transportation cost is high or the transportation capacity is insufficient; [0004] (2) There are many coal mines around the power plant, and the coal supply is unstable; [0005] (3) After the unit is transformed or increased in capacity, it is difficult for the original type of coal to meet the operation requirements. [0006] In order to avoid the adverse effects of the above-mentioned factors in power plants, ...

AI Technical Summary

Problems solved by technology

[0003] (1) The type of coal used is in short supply or the price is high, the transportation cost is high or the transportation capacity is insufficient;

[0004] (2) There are many coal mines around the power plant, and the coal supply is unstable;

[0005] (3) After the unit is transformed or increased, it is difficult for the original type of coal to meet the operation requirements

[0006] In order to avoid the adverse effects of the above-mentioned factors in power plants, most power plants adopt coal blending and blending technology, but coal blending is mostly high-quality coal blended with low-quality coal, especially blending high-moisture, high-sulfur, Low-priced coal with high volatile content, and the problems caused by blending low-quality coal are: if the blending ratio is improper, the combustion effect of the boiler will deteriorate, the operation stability will decrease, it will be difficult to adjust the peak at low load, and the thermal efficiency of the boiler will decrease. Slagging and overheating of the superheater occur, the desulfurization system is not suitable, the power consumption of auxiliary equipment increases, the pollution discharge exceeds the standard, and the safety, economy and environmental protection of the boiler will be damaged

[0008] The publication number is CN 104156781 A, and the patent application number is 201410337701.4. The ancient invention patent discloses "a method for obtaining the coal quality parameters of coal blended with the lowest cost for thermal power unit boilers. By this method, reasonable coal types and optimal proportions can be obtained. , the objective function to obtain is the lowest coal blending cost, but its limitation is that it does not take into account the impact of the change of coal type on the safety, environmental protection, and economy of the entire generating set, and the calculation of coal quality parameters for blending coal In the process, although there is theoretical calculation, there is no part of experimental verification, so it is difficult to guarantee the accuracy of calculation

At the same time, the constraints given are broad and unclear

Images