W flame boiler primary air waste-steam replacement method and apparatus for

Abstract

The invention relates to a replacement method of primary air blast gas of a W flame boiler. The invention cuts off a primary air blast pipe of a coal powder inflamer on a front crown and a back crown of the existing W flame boiler, cancels a blast gas that is communicated with a combustion chamber and downwards shoots between 5 and 30 percent of the gross of the secondary air to the combustion chamber with an angle of ranging from 0 degree to 60 degrees to the vertical direction at a speed of 10 - 50m/s by making use of the position of a spout of the original primary air blast gas. The replacement method of primary air blast gas of W flame boiler is to insert a secondary air pipe on the position of the spout of the original primary air blast gas of the coal powder inflamer. Compared with the prior art, the invention has the advantages of (1) being able to remove the unreasonableness of the exiting equiblast mode of the existing W flame boiler; (2) being capable of improving the stability of the flame of the coal powder airflow, increasing the flame stroke, intensifying the supplying and mixing of the oxygen amount in later period of combustion and reducing the carbon content of flying ash, etc; (3) making fully use of the original combustion system structure and being extremely suitable for the technical improvement of the existing W flame boiler.

Description

technical field [0001] The invention relates to a method and a device for replacing primary air exhaust gas of a W-flame boiler, belonging to the technical field of W-flame boiler combustion. Background technique [0002] my country is one of the few countries in the world rich in anthracite reserves, with proven reserves of nearly 120 billion tons. However, due to the low volatile matter content of anthracite and the high precipitation temperature of volatile matter, it is difficult to ignite the pulverized coal airflow, the combustion is unstable, and it is not easy to burn out, resulting in increased mechanical incomplete combustion during boiler operation and low boiler efficiency. In order to improve the operation safety and economy of boilers burning anthracite and other low-response coals, my country introduced the FW-W flame boiler combustion technology of the American FW Company in the late 1980s. At the same time, the domestic Dongfang Boiler Factory has introduce...

AI Technical Summary

Problems solved by technology

[0011] 2. The separation effect of the pulverized coal cyclone separator is not ideal

Due to the unsatisfactory separation effect of the pulverized coal cyclone separator, the fine pulverized coal particles cannot be separated and enter the furnace with the exhaust gas; the fineness and concentration of the pulverized coal particles are important factors for the ignition of the pulverized coal airflow, and the The average fineness of pulverized coal particles in the main airflow becomes coarser and the concentration decreases,

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