Flowing And Combustion Characteristic Study Of Swirled Burner For Coal-bed Methane

Calorific value of coal bed methane that contains 30% methane concentration is lower. Studying and exploiting a special burner suit for burning this coal bed methane efficiently and cleanly is endowed with good economic, social and environmental benefit for relieving energy sources intensity, controlling coal-bed gas pollution and utilizing coal bed gas sources reasonably.The experimental study on coal-bed Methane burner match different structure nozzle under many kinds of heat loads are conducted. Flow field distribution of the swirled burner, the resistance characteristic along with the burner nozzle angle and the heat load change were studied in the paper. The thermal-state experiment inspected the burning area flame characteristic, the temperature field and the component density distribution along with the burner structure, the heat load and the excess air coefficient change rule.Cold flow field of swirled burner for low concentration coal-bed methane was studied in the paper. A hot-wire anemometer was used to measure the velocity, and flow field distribution of the swirled burner was obtained. Then, the vent angle effect on the burner flow field was studied. The experimental results show that a steady center recirculation zone is formed at the root zone of the burner with different vents. When the burner has gradually expanded vent, jet expansion angle increases. When the burner has gradually divergent vent, the jet penetration capability increases. The swirled burner has favorable flow field for the ignition and combustion of low heat value coalbed methane.The thermal-state combustion experimental result indicated that swirl burner can stably combust under the different heat load and has the wide load control ability. The burner flame can not crush out and is long, the width is big, the flame angle of divergence is big. Excess air coefficient's change can affect the exhaust emissions and the combustion efficiency of burner. And discovered works as whenα=1.00, N-5 tapers nozzle's thermal efficiency to be highest, in the chamber exhaust NOx and the CH4 content is lowest. Through experimental study compared a low concentration of coal-bed methane with natural gas-fuelled swirl burner's flowing and combustion characteristics. For coal bed methane burner of industrial and commercial applications and ultimately laid the foundation for the theory and technology.