Layered decoupling coal-burning technology and mechanical layered decoupling furnace

Abstract

The present invention relates to the layered decoupling coal buring technological and mechanical layered decoupling furnace. Coal is burned in the combustion chamber to produce fume exhausted to gasifying chamber or flue and semi-coke conveyed to the mechanical grate of gasifying chamber; the coal on the semi-coke layer is ignited from the bottom, burnt in anoxic condition and gasifying pyrolyzed; NOx in the fume is reduced into N2; and after being mixed with the second draft, CO and smoke black are burnt out. The separated burning in the mechanical layered decoupling furnace produces lowered pollutant exhaust and high burning efficiency.

Description

technical field [0001] The invention belongs to the field of raw coal combustion technology and combustion equipment, and in particular relates to a layered decoupling combustion technology and a mechanical layer that can reduce the emission of nitrogen oxides, soot and carbon monoxide from a large-load layered combustion boiler and improve the efficiency of the combustion boiler Shaped decoupled combustion furnace. Background technique [0002] At present, my country has made a lot of progress in solving the pollution discharge of small-capacity and large-capacity industrial boilers, but there are still few combustion technologies for high-efficiency and low-pollution discharge of medium-sized mechanical floor-fired boilers with large consumption. [0003] The traditional layer-fired industrial furnace has a simple structure, only figure 1 In the furnace part on the right (main combustion chamber), the coal-fired coal seam directly enters t...

AI Technical Summary

Problems solved by technology

Due to the short residence time of the flue gas in the high-temperature area and the uneven mixing of coal combustion products and excess air, on the one hand, CO and soot cannot be burned out, and on the other hand, the NOx produced by combustion cannot be reduced, resulting in environmental pollution and low efficiency.

If the excess air coefficient or furnace temperature is increased, although the emission of CO and soot is reduced, the emission of NOx increases accordingly, and the loss of exhaust smoke increases; on the contrary, if the excess air coefficient or furnace temperature is reduced, although the emission of NOx Lower emissions, but higher CO and soot emissions

In addition, since the ignition of the coal seam starts from the upper part, some small particles of coal in the lower part will leak into the ash hopper without burning, which also reduces the combustion efficiency.

[0004] The applicant's patented technology CN 95 102081.1 in 1995 uses coal in the gasification chamber to use its own combustion heat to make coal anaerobic pyrolysis and gasification before combustion, and has successfully achieved a production rate of less than 0.5t / h. Low pollution emission of small-capacity boilers, but because the gasification chamber is mainly for anaerobic carbonization and pyrolysis of coal, the pyrolysis speed is relatively slow; the suppression of NOx emissions is mainly carried out in the semi-coke area, so the ventilation and combustion speed should not be too high quick

In addition, for the gasification chamber with a large load, there are problems such as the difficulty of coking and removing coal, which limits its application to the large-load layer combustion furnace

Images