Comprehensive Performance Evaluation Of Biomass Gasification Combined Cooling,heating And Power System (BGBCCHP)

Energy and environment are the important foundation and guarantee for the survival and development of human society.As an important means of renewable energy utilization,biomass gasification combined cooling,heating and power(BGBCCHP)system has been strongly supported by many countries because of its high efficiency,energy saving and environmental protection.At present,BGBCCHP system has been used in many buildings.However,scientific and correct evaluation is an important link to promote the development of the system in a better direction.This paper takes an office building in Beijing as a case study.Taking the natural gas CCHP system as the reference system,the comprehensive performance of BGBCCHP system under different operation modes is studied.The comprehensive performance evaluation model of BGBCCHP system was established by using analytic hierarchy process(AHP).The results show that the optimal comprehensive performance of the system is obtained under the mode of following the electric load(FEL),while the worst comprehensive performance is obtained under the mode of following the thermal load(FTL).The environmental performance has the greatest impact on the comprehensive performance of each operation mode,and the economic performance has the least impact.Annual carbon dioxide emissions,exergy efficiency and biomass energy utilization are the main indicators that affect the comprehensive performance of the operation mode.The comprehensive performance of biomass gasification cogeneration system is affected by many influencing parameters.The sensitivity analysis shows that the change of biomass gasifier efficiency has the greatest impact on the comprehensive performance of the system,and the electricity price has the least impact on the comprehensive performance.This study also uses other evaluation methods to verify the correctness and rationality of AHP principle in the BGBCCHP system evaluation.