Experimental research on gas components and heating value in pressurized turbulent circulating fluidized bed gasifier

To discuss the influence of different operating parameters on the gas components and the lower heating value(LHV) of pressurized turbulent circulating fluidized bed(CFB) coal gasification,hot test was successfully realized by multi-parameters operating mode using Huaibei bituminous coal.During the test,the gasification pressure kept 0.3 MPa,the gasification temperature ranged from 830 to 910 ℃,the air/coal ratio ranged from 0.29 to 0.4 kg/kg and the steam/coal ratio ranged from 0.32 to 0.53 kg/kg.In the riser,turbulent fluidization in the dense zone and core-annulus flow in the dilute zone was established by using the wide-screen quartz sands.Experimental results prove the feasibility of a pressurized turbulent CFB coal gasification process.The gasification temperature has the most significant effect on the gasification process.The maximally taking value of the sum of combustible components exists when the air/coal ratio was 0.35 kg/kg and the steam/coal ratio was 0.38 kg/kg.The LHV is 4138.98 kJ/m3 at this moment.