Decarbonization in thermal power industry is directly related to the realization of the “double carbon”target

while the circulating fluidized bed boiler has the advantages of wide fuel applicability and can carry out large-scale fuel blending. Biomass fuel is a renewable “zero-carbon” energy source

its blending can greatly reduce the carbon emissions of thermal power plants. Based on the existing circulating fluidized bed boilers and coal-fired conditions

biomass co-firing tests were conducted

and comprehensively evaluation was also carried out on combustion stability

pollutant emissions

and thermal efficiency. The co-firing experiments results showed that

as the co-firing ratio increased

the coal consumption rate per unit of steam production significantly decreased

with stable combustion conditions maintained throughout the process. Under co-firing conditions

the consumption of limestone decreased to approximately 4.5 kg for 1 ton steam production

with SO_2 emissions meeting the standards. Blending raised the furnace temperature

elevated the exhaust temperature

increased the fly ash content

and slightly increased the heat loss. Through regulating the air volume ratio

material layer pressure difference and excess air coefficient

the overall thermal efficiency closely approached the design value.Under long-term operating conditions

the blending ratio of biomass reached about 30%

and the emissions of SO_2 and NO_x were qualified. The tail heat exchanger was not corroded obviously

and the CO_2 emission reduction amount reached about 480 kg for 1 ton steam production.