Moisture as received coal on-line identification method based on heat balance of powder process system

Abstract

The invention discloses a moisture as received coal on-line identification method based on the heat balance of a powder process system and belongs to the technical field of coal quality on-line identification of power stations. According to the moisture as received coal on-line identification method, on the basis of the heat balance mechanism analysis, by means of comprehensive optimization strategies of multi-mill optimization, closely integrated with the mainstream coal blending co-firing way of coal-fired power plants, the on-line identification method provides a complete on-line identification system which is capable of simultaneously reflecting the real-time values and characteristics of types of the moisture as received coal, and the moisture as received coal on-line identification method has the advantages of being capable of improving the accuracy and the stability of identification results, improving the accuracy and the reliability of the final identification results, and effectively eliminating abnormal situations of the saltation of identification types.

Description

technical field [0001] The invention belongs to the technical field of on-line identification of coal quality in power stations, and in particular relates to an on-line identification method for incoming base moisture of furnace coal based on the heat balance of a pulverizing system. Background technique [0002] In view of the current situation of "energy shortage, market coal, and planned electricity", most of the coal used by power plants is characterized by various sources and variable coal quality, and the performance indicators of coal entering the furnace deviate far from the designed coal type; on the other hand, more and more More and more power plants tap the potential and increase efficiency by carrying out coal blending and blending work. "Blending in front of the furnace, blending coal in the whole warehouse" and "blending coal in separate bins, blending in the furnace" are two common mainstream blending methods at present. The former It is suitable for situatio...

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Problems solved by technology

[0005] 1) The hardware equipment is expensive and needs to occupy a large amount of capital costs of the power plant;

[0006] 2) The working environment of the power plant is harsh, and the precision and durability of online monitoring instruments are high;

[0007] 3) The diffuse reflection or transmission signal of the coal sample that the measurement results depend on is very weak, and the fineness, bulk density and thickness of the on-site coal powder have a great influence on the accuracy of the online monitoring results.

[0008] 4) For the application scenario of "separate bin coal blending and blended combustion in the furnace", the sampling point of the equipment needs to change with the number of blended coal types, resulting in a complex system and high cost;

[0010] 1) The range of applicable conditions for the heat balance mechanism is not clear, and the influence of fluctuations in actual working conditions on theoretical calculation results is not considered;

[0011] 2) Generally, only a single mill is used as the object to solve the modeling and solution of the received base moisture, without considering the comprehensive processing and application of the theoretical results of multiple mills;

[0012] 3) There is no overall modeling analysis combined with the specific coal blending and burning scheme of the power plant, and it is impossible to realize the online identification of the received base moisture of each coal blending type and blended coal;

[0013] 4) There is no evaluation and analysis of the basic moisture category of the incoming coal, and it is generally difficult to directly apply the calculated real-time moisture value to DCS closed-loop control, performance index calculation or economic analysis

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