Method and device for optimization control over primary air of coal-fired generator set

Abstract

The embodiment of the invention discloses a method and device for optimization control over primary air of a coal-fired generator set. By adoption of the method and device, the primary air ratios of all coal pulverizers are lowered, throttling loss of hot primary air is reduced, and output of primary air fans is reduced. The method for optimization control over the primary air of the coal-fired generator set comprises the steps that S1, highest values of the minimum air-coal ratio for raw coal grinding, the minimum air-coal ratio for pulverized coal preheating and the minimum manual air-coal ratio are selected, and the number of a coal pulverizer with the maximum coal feeding ratio and the corresponding coal feeding ratio are determined; S2, primary air ratios A required for grinding and preheating of the coal pulverizer with the maximum coal feeding ratio are calculated through the selected minimum air-coal ratios and the coal feeding ratio corresponding to the coal pulverizer with the maximum coal feeding ratio, a primary air ratio B for pulverized coal conveying is determined, the highest values of the primary air ratios A and the primary air ratio B are selected, and the minimum primary air ratio required for operation of the coal pulverizer with the maximum coal feeding ratio is obtained; and S3, the output of the primary air fans is adjusted until the total primary air ratio of the coal pulverizer with the maximum coal feeding ratio meets requirements of the minimum primary air ratio.

Description

technical field [0001] The invention relates to the field of automatic control of thermal power units, in particular to a method and device for fast and optimal primary wind control of a coal-fired power unit. Background technique [0002] The primary air of the boiler has the functions of cooperating with raw coal grinding, conveying coal powder, preheating coal powder, providing oxygen amount at the initial stage of coal powder ignition, and affecting the formation of boiler flue gas nitrogen oxides NOx, etc. Reasonable control of primary air rate, primary air door opening and primary air Pressure, can improve boiler safety, energy saving, emission reduction performance. [0003] Traditionally, the primary air rate and primary air pressure of the coal mill are basically calculated and determined by the boiler factory or boiler thermal test unit according to the design coal type and the specific working condition requirements. The primary wind rate and primary wind pressur...

AI Technical Summary

Problems solved by technology

The primary wind rate and primary wind pressure determined by this method are mainly to ensure the safe operation of the boiler, but it is difficult to meet the needs of variable coal quality of the unit and changes in the operating conditions of the boiler, and it is also difficult to meet the needs of energy saving and emission reduction of thermal power units.

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