Design and Numerical Study of Small Horizontal One Turn Biomass Gas Boiler
Research on boiler using biomass gas as fuel was of great significance to promoting the utilization of biomass energy.For the first time,a single baffle horizontal boiler burning biomass gas was proposed,which was equipped with a tail flue gas recirculation heat pipe to study the main combustion flow field of the biomass gas furnace.The main combustion flow field of biomass gas furnace was studied at the inlet velocity of 10 m/s,15 m/s and 20 m/s.the temperature distribution,combustion and flue gas resistance were analyzed,and the central line heating capacity p and pressure difference dwere proposed.It was concluded that under the designed structure,the combustion was rapid,the flame position was stable,the maximum temperature in the furnace was less than 1 400 K,and there was no thermodynamic NOx produced.The strong heating capacity area was concentrated between the area of Z=0.2～1.5 m.The hot water pipe could reduce the maximum exhaust temperature by 176 K without producing large flow resistance.However,under condition 3,the positive pressure was partly made in the furnace,which caused the inlet velocity should be controlled.Overall,the design can meet the requirements of stable combustion of biomass gas and made no NOx emissions,which could play an important role in promoting large-scale application of biomass gas and showed obvious environmental and economic values.
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