Improving pulverized coal ignition combustion w flame boiler

Abstract

The present invention relates to an ejection staged combustion W-flame boiler which improves the ignition and combustion of pulverized coal. Multiple secondary air nozzle groups, multiple pulverized coal airflow nozzle groups, multiple secondary air nozzle groups and multiple pulverized coal airflow nozzle groups are arranged side by side and staggered in a straight line along the furnace width direction, and multiple pulverized coal The air flow nozzle group can be installed on the furnace arch at a fixed angle, the incident angle of the secondary air can be adjusted, multiple burn-out air nozzles with adjustable incident angles can be installed on the upper furnace, and two layers of incident air can be installed on the front and rear walls of the furnace. Angle-adjustable three-way air nozzle. The W flame boiler of the present invention can effectively improve the pulverized coal combustion in the furnace, improve the adaptability of the boiler to coal types, effectively adjust the main reheat steam temperature to reach the design value, reduce NOx emission and exhaust gas temperature, and prevent slagging of the front and rear walls , to avoid thermal fatigue on the water wall of the cold ash hopper.

Description

technical field [0001] The invention relates to the technical field of W-flame boiler combustion, in particular to an ejection staged combustion W-flame boiler which can effectively improve the ignition and combustion of pulverized coal and whose main combustion zone in the W-flame boiler can be adjusted. Background technique [0002] Coal is the most important primary energy in my country at present and for a long time to come, and coal for thermal power generation is one of the main ways of coal utilization in my country. According to my country's fuel policy and energy utilization situation, the proportion of anthracite and lean coal in the coal consumption of power plant boilers is as high as 40% to 50%, and will be further increased in the future. In order to achieve high-efficiency burning of anthracite and lean coal, a W-flame furnace type specially designed for burning anthracite and lean coal has been developed abroad. my country has introduced W-flame boilers from ...

AI Technical Summary

Problems solved by technology

Summarizing the operation of Douba technology and my country's Douba technology W flame boiler, there are many problems, such as late ignition of pulverized coal jet, poor combustion stability, serious slagging (including side walls and front and rear walls, etc.), burnout Poor, NO x High emission (generally 1100~1700mg / m 3 (6% oxygen)), although Chinese scholars have developed a new type of burner with independent property rights in response to the above problems, the operation situation shows that the "W" flame boiler still has reheating steam temperature deviation from the design value, low burnout rate, and stable combustion. Poor performance, high exhaust gas temperature, NO x High carbon content in emissions and ash slag, severe slagging on the front and rear walls, and large flame undershoot cause problems such as thermal fatigue cracking and pipe burst on the water wall of the cold ash hopper

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