Abstract:

Biomass energy is a renewable and clean energy,which is of great significance for energy conservation and emission reduction.Biomass power generation can not only achieve carbon neutralization,but also replace some coal power after achieving carbon peak in China,which has become an important force in peak shaving of power grid.The combustion characteristics of biomass were analyzed,and the applications of pure biomass combustion for power generation,co-firing of biomass and coal for power generation,and biomass gasification coupled with coal in China and abroad were introduced respectively.It is pointed out that the capacity,efficiency and availability of pure biomass combustion units are insufficient,and the ash deposition and chlorine corrosion are prone to occur.The biomass and coal co-combustion technology can make use of the existing large-capacity power generating units with a little additional investment,and bring in high flexibility and improvement on biomass utilization efficiency.It is an economical and feasible power generation scheme at this stage,since it can avoid a series of problems caused by pure combustion.But the construction and operation of biomass and coal co-firing power generation projects will be difficult without policy support on electricity price.

Key words: biomass energy, pure combustion, co-combustion, co-firing of coal and biomass for power generation, circulating fluidized bed, carbon peak, carbon neutrality, zero carbon, ultra-low pollutants emission