Study on the adaptability of small-grain oil shale and semi-coke CFB boiler combustion

Oil shale pyrolyzed at low temperature can get shale oil.Due to the limitation of producing process,oil shale with diameter below12 mm can not be used in the distillation furnace,and a large number of by-products (shale semi-coke) are produced.This study was carried out to improve the utilization of by-products and maximize the use of resources.The physical and chemical properties,ignition characteristics,burnout features and coking performances of small particle shale and shale semi-coke were studied on a 1 MW_(th)CFB combustion test device.The experimental results show that the designed fuels from small particles and semi-coke in oil shale can guarantee stable combustion in CFB,When the combustion temperature is in the range of 720 to 850 ℃.CFB boiler is suitable for oil shale small particles and semi-coke blending burning.This way has the characteristics of high combustion efficiency and good combustion stability.