Combined ignition nozzle of dry coal powder fluidized bed gasifier

Abstract

The invention discloses a combined ignition nozzle of a dry coal powder fluidized bed gasifier. The combined ignition nozzle comprises an inner nozzle, an outer nozzle and an outer layer cooling jacket, wherein the inner nozzle comprises an igniter and a fuel gas channel; the front end of the outer nozzle is a sealed end; the outer nozzle comprises an oxygen channel with a divergent opening structure, a spindly axial inclined oxygen blower, an ignition oxygen output opening, and a cooling water distributor; the axial inclined oxygen blower is arranged at the front end face of the nozzle in a manner of a dual-layer ring; the outer layer cooling jacket comprises two layers of annular channels, and single spiral flow channels with throats at the front ends of the annular channels. Ignition can be easily finished, and is stable and reliable, and the generated flame has high-strength combustion value, the heating rate of the gasifier is accelerated, and the service life is long.

Description

technical field [0001] The invention relates to an ignition burner for a pulverized coal gasification furnace, in particular to a combined ignition burner for a pulverized coal fluidized bed gasification furnace. Background technique [0002] With the increasing shortage of global oil resources, the practical status of coal resources in the chemical industry is becoming more and more important. What follows is that coal gasification is used more and more widely in the chemical industry, and there is a tendency to gradually replace petrochemicals. In the coal chemical industry, the gasifier is the focus of the coal chemical industry. In the gasifier, the ignition burner and the process burner are important parts of the gasifier. The role of the ignition burner is to raise the furnace temperature and ignite the coal medium when the gasifier is put into use. However, the following problems occurred during the use of the ignition burner: ignition is difficult, and it often req...

AI Technical Summary

Problems solved by technology

However, the following problems occurred during the use of the ignition burner: ignition is difficult, and it often requires multiple ignitions to be successful; the ignition burner is easily burned out, and its service life is short, which increases the cost of use and labor costs for replacement, and reduces gas consumption. maximized work efficiency

The end of the cooling water jacket used has a baffle-type structure. When the cooling water flows through the end, it cannot enter all parts of the burner, resulting in uneven cooling and serious local overheating.

At the same time, due to the low flow rate of cooling water, it is easy to obtain enough heat to be vaporized, and a large amount of steam is generated, which will significantly damage the life of the burner.

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