For the cogeneration system of biomass co-firing coal as fuel

comprehensively considering various influencing factors of energy conservation

economy and environmental protection

a multi-objective evaluation system is established

and energy efficiency analysis is conducted for the system. From the energy value point of view

the different energy value indicators are analyzed to explore the influence of mixed biomass on the cogeneration system

thus to determine the optimal blending ratio of biomass. The results show that

under the same load conditions

the cogeneration system using biomass-mixed coal as fuel can not only save the operating cost of the system

but also has great potential in reducing emissions of SO_x

NO_x

CO_2 and other gases. Moreover

it also has good environmental and economic benefits. From the energy value point of view

among the three blending ratios(10%

15%

and 20%)

20% is the best blending ratio

which has the highest yield and environmental benefit

and the economy and environmental prospects is better.