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Experimental Study on the Removal of N2O with Biomass Gas Reburing in a Coal-fired CFB

Author: ZhangHanFei
Tutor: DongChangQing；YangYongPing
School: North China Electric Power University (Beijing)
Course: Thermal Power Engineering
Keywords: N2O NO Circulating fluidized bed Biomass gas Reburn
CLC: X701.2
Type: Master's thesis
Year: 2011
Downloads: 66
Quote: 0
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Abstract


Circulating fluidized bed boiler , fuel adaptability, load regulation ability, high combustion efficiency, high efficiency furnace limestone desulfurization can be achieved in recent years, the rapid development in China . But the circulating fluidized bed combustion of another greenhouse gas N2O emissions is far higher than other combustion emissions. Therefore, the use of coal-fired circulating fluidized bed technology advantages , we must take appropriate technical measures to reduce N2O emissions. In the circulating fluidized bed boiler , biomass gas a lot of CH4, H2, CO and CnHm reducing gases such as N2O reduction reaction can promote and biomass gas temperature combustion heat release and promote the thermal decomposition of N2O . Achieve a forestry waste material reuse, reduce some of the amount of coal . This paper established a circulating fluidized bed system and a fixed bed experimental biomass gasification experiment system . In circulating fluidized bed were used to simulate gas and biomass fixed bed biomass gasifier gas mixed with pulverized coal combustion simulation results show that the biomass fixed bed biomass gasifier gases and gas production can effectively de- In addition to N20. Using CO as gas reburning , respectively, from different biomass into the furnace through the gas outlet , the results show port C (C mouth height of the air distribution plate of the fluidized bed reactor tube diameter ratio of 8.3 ) through the removal rate of N2O fashionable up , up to 88%. Using simulated biomass gas pass into the C port when the circulating fluidized bed , N2O removal rate of biomass into the furnace along with the increase of gas increases ; when pass into the circulating fluidized bed furnace accounted simulated biomass gas into the furnace heat when heat is 10.5% coal , N2O removal rate can reach 99%. The fixed bed biomass gasifier actual biomass gas produced from a different outlet pass into the circulating fluidized bed furnace , the experimental results show that the biomass gas for N2O removal had a significant effect ; mouth pass into the C biomass gas, the removal rate of 99 %, which is consistent with the experimental results of CO , indicating that C port ( height to diameter ratio .8.3 ) biomass gas removal is the best outlet for N2O . In addition, biomass gas and has a good on NO removal efficiency , the highest removal efficiency can reach 55%.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Exhaust gas processing and utilization > Smoke and dust
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