高温低热值煤气燃烧器结构优化的实验研究

Experimental Study of the Structural Optimization of a High Temperature Low Heating Value Coal Gas Burner

对一种高温低热值煤气燃烧器进行了改进和优化设计,在低热值煤气管内增加了中心管,并将原燃烧器空气管的渐缩喷口改成渐扩喷口,去掉煤气管的渐缩喷口。对比优化前后燃烧器的热态实验数据,结果表明:改进后燃烧器能持续稳定燃烧以CH4和N2配制的热值为3.9 MJ/m3和以CO和N2配制的热值为4.0 MJ/m3且预热温度均为660℃的低热值煤气,火焰稳定不脱火;而原燃烧器仅能燃烧热值大于16.31 MJ/m3、预热温度为660℃的低热值煤气,且火焰不稳定根部出现严重的脱火现象。

A high temperature low heating value coal gas burner was improved and optimization designed and a central tube was additionally mounted inside the low heating value coal gas tube with the converging spout on the air tube of the original burner being changed to a diverging one and the converging spout on the coal gas tube being removed.A contrast of the hot state test results of the burner before and after the optimization shows that the improved burner can sustainably and stably burn the fuel prepared by CH4 and N2with its heating value being 3.9 MJ / Nm3 and the heating value of the fuel prepared by CO and N2 being 4.0 MJ / Nm3,of which the preheating temperatures of the lowheating value coal gases are all 660 ℃.The flame is stable and cannot be blown off.However,the prototype burner can only burn the low heating value coal gases with their heating values being greater than 16.31 MJ / Nm3 and the preheating temperature being 660 ℃.Furthermore,the flame is unstable and serious flame-out phenomena occur at the root of the flame.