Combustion characteristics of fully premixed water-cooled low-NOx biogas burner
Biogas is a kind of gas transformed by biomass fermentation.At present,the biogas burners are mainly diffused burners and atmospheric burners,which generally have low thermal strength and are easy to blow out.Based on fully premixed water-cooled combustion technology,a kind of water-cooled biogas burner was designed.Then,the effects of CO2 content,excess air coefficient,heat load and cooling water temperature in simulated biogas on combustion characteristics of burners were explored.The results showed that the designed burner had good adaptability for biogas with methane concentration from 55％-80％.As the CO2 content increased,the combustion temperature decreased,the NOx and CO content at the outlet decreased,but the flame length increased.As the excess air coefficient decreased,the combustion heat intensity improved,however,the NOx and CO content in the flue gas increased.The result showed that the heat load of burner had a great influence on the maximum combustion temperature.The burner could still operate stably under the minimum load of 35％.
water cooledfully premixedlow NOxcombustion characteristics
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