Study Of Biomass Gasification Integrated With The Natural Gas Power Generation

Biomass gasification integrated with the natural gas power generation(BG-NGCC)can significantly reduce the greenhouse gas emissions of power plants and tackle the global warming.This method allows the continued use of existing equipment of natural gas turbine combined cycle(NGCC),and only a set of biomass gasification equipment is needed.Compared with re-establishment of biomass gasification power plant,the investment proportion of BG-NGCC is small and the economic benefit is high.The application of biomass syngas in NGCC power plant should be within the equipment constraints.When the equipment is in normal operation,the power generation efficiency is the key parameter of BG-NGCC system benefit,which is affected by many factors.So it is of great significance to study the influence of these factors on the system efficiency.In this paper,the modeling and model verification of biomass gasification process and NGCC power plant are carried out by using Aspen plus software.,based on which the BG-NGCC power system is established.Then the influence of different gasification conditions(including Equivalence Ratio ER,Steam to Biomass Ratio S/B,gasification temperature and gasification pressure)and different types of biomass material on the power generation efficiency of the system is analyzed.The study shows that different gasification conditions have different effects on the system power generation efficiency.With the increase of ER,the net generation efficiency of the system increases first and then decreases,reaching a maximum of 50.33% when ER=0.55 before decreasing.With the increase of S/B,the net generation efficiency decreases linearly,from 51.59% to 40.82%.When the gasification temperature increases from 700℃ to 1000℃,the net power generation efficiency slowly decreases from 50.00% to 48.85%.The gasification pressure increased from normal pressure to 19 bar,and the net generation efficiency of the system increases from 49.64% to 52.06%.Besides,under the same gasification conditions,for different biomass raw materials,the maximum mixing ratio is different,which are 0.31,0.22 and 0.11 for pine sawdust,rice husk and rice stalk respectively.For different biomass raw materials,with the increase of mixing proportion,the net power generation efficiency of the BG-NGCC system presents a downward trend.In addition,under the same mixing ratio,the BG-NGCC system with pine sawdust as biomass material has the highest net power generation power and net power generation efficiency,followed by rice husk and the lowest rice stalk.