Coal-fired boiler secondary damper damper control method based on burner heat load

A secondary damper, coal-fired boiler technology, applied in the combustion method, combustion control, air supply and other directions, to achieve the effects of improving combustion economy, reducing NOx emissions, and reducing smoke temperature deviation

Active Publication Date: 2017-03-08
SHANGHAI MINGHUA ELECTRIC POWER TECH & ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is difficult to achieve with the current furnace big bellows differential pressure control method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0017] The total air volume of the boiler is controlled by the blower, and the opening of the secondary air door baffle is controlled according to the heat load of the burner, and the opening is a relational function of the sum of the heat load of the adjacent two burners. The heat load of the burner is the heat load correction coefficient of the output of the corresponding coal mill multiplied by the coal quality, and this correction coefficient is related to the characteristics of the coal quality. The minimum opening of the secondary air baffle is the cooling opening, and the maximum opening is determined by the minimum limit of the differential pressure between the furnace and the large wind box.

[0018] Taking the opening of the secondary air baffle in layer BC as an example, set the coal pulverizer output of layer B and layer C as B and C, and the correction coefficient of burner heat load as k B 、k C , the maximum heat load of each burner is Q, and the secondary dampe...

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Abstract

The invention relates to a coal-fired boiler secondary air valve baffle control method based on burner heat loads. The secondary air valve aperture is set according to different burning characteristics of burners on all layers, the secondary air interlayer distribution is controlled, and real-time matching control over secondary air distribution of burner areas and the heat loads of the burners on all layers is carried out. Compared with the prior art, the coal-fired boiler secondary air valve baffle control method has the advantages that burning conditions of the different heat loads of the burners can be met, the boiler burning economical efficiency is improved, the NOx emission is reduced, and the smoke temperature deviation is reduced.

Description

technical field [0001] The invention relates to a method for controlling a secondary air door baffle of a coal-fired boiler, in particular to a control method for a secondary air door baffle of a coal-fired boiler based on the thermal load of a burner. Background technique [0002] At present, the secondary air door control method of coal-fired power generation boilers mostly adopts the differential pressure control method of the furnace-large air box, and the adjustment of the auxiliary secondary air is jointly controlled by setting the total air volume curve and the differential pressure curve of the furnace large air box. It is a simple combustion control method, based on the fact that the coal quality remains unchanged, and its principle is that each burner is equally distributed with air. The disadvantage is that it only controls the differential pressure between the furnace and the large air box, and has no constraints on the small damper baffles of the burners on each...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23N3/00
Inventor 王健全文涛吕晓东
Owner SHANGHAI MINGHUA ELECTRIC POWER TECH & ENG
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