生物质气化发电能耗和温室气体排放分析

ENERGY CONSUMPTION AND GREENHOUSE GAS EMISSION OF BIOMASS GASIFICATION AND POWER GENERATION SYSTEM

利用混合式生命周期分析方法对1 MW和5.5 MW生物质气化发电系统的能耗和温室气体(GHG)排放进行分析,结果表明:每输出1 GJ电力,1 MW和5.5 MW生物质气化发电系统一次化石能源消耗分别为0.238 GJ和0.258 GJ,GHG排放分别为40.4 kg CO_2-eq和49.8 kg CO_2-eq,其中发电阶段的能耗和温室气体排放最高;两个系统的能源替代率在90%以上,GHG减排率在80%以上;生物质气化发电系统具有良好的可持续性,可在节能减排中发挥重要作用。

Aiming at evaluating feasibility and sustainability of biomass gasification and power generation （BGPG） system in China, a hybrid Life Cycle Assessment （LCA）method combining process analysis with economic input-output analysis was used to quantify energy consumption and greenhouse gas （GHG） emissions over the entire life cycle of 1 MW and 5.5 MW BGPG systems. The results show that the BGPG systems can save up to 90% of primary fossil energy when substituting conventional electricity, with life-cycle energy consumptions of 0.238 and 0.258 GJ/GJ for 1 MW and 5.5 MW BGPG systems, respectively. On the other hand, the BGPG systems can reduce GHG emission by more than 80%, with life-cycle GHG emissions of 40.4 and 49.8 kg CO2-eq/GJ for 1 MW and 5.5 MW BGPG systems, respectively, the energy consumption and GHG emission is the highest in electricity generation process. The results indicate that BGPG system possesses well sustainability and can play a positive role in energy conservation and emission reduction.