加压湍动循环流化床气化炉煤气成分与热值试验

为了研究不同操作工艺参数对加压循环流化床煤气化特性的影响,在加压湍动循环流化床热态实验台上对淮北烟煤进行煤气化试验,试验操作条件：气化炉压力p为0.3 MPa、气化温度t为830～910 ℃、空气煤质量分数w(空气煤)为0.29～0.4 kg/kg、蒸汽煤质量分数w(蒸汽煤)为0.32～0.53 kg/kg.通过多参数组合变换工况,分别考察试验操作条件对煤气成分和煤气热值的影响.采用宽筛分石英砂作为床料,在试验过程中粗石英砂加剧气化炉提升段下部密相区的扰动程度,同时细石英砂提高上部稀相区颗粒体积分数,加上气化炉本体具有下宽上窄的特征,在一定范围内实现气化炉提升段下部湍动流化,上部环核流动.结果表明,气化炉温度对加压煤气化过程影响最为显著,并在w(空气煤)为0.35 kg/kg、w(蒸汽煤)为0.38 kg/kg时,煤气热值达到最大值4 138.98 kJ/m3.

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.