气化参数对固定床煤高温空气气化的影响

在内径为0.2 m的固定床气化炉试验装置上进行了煤高温空气气化试验研究,考察了气化实际供给的空气量与煤完全燃烧理论所需的空气量之比(α)、气化消耗的蒸汽的物质的量与煤中碳的物质的量之比(ns/nc)、空气预热温度等工艺参数对高温空气/蒸汽作为气化剂的煤气化指标的影响.结果表明,α和ns/nc对气化指标的影响本质上是通过改变气化温度来实现的;α和ns/nc的最佳值分别为0.23~0.25和0.37~0.45;在工艺条件允许的范围内,空气预热温度越高对气化过程越有利.

Impact of Gasification Parameters on Coal Gasification in Fixed Bed with High-Temperature Air

High-temperature air gasification of coal was experimentally investigated in a fixed bed gasifier with ID 0.2 m. The effects of process parameters, such as the ratio of air actually supplied to that required theoretically for complete combustion in gasification process (α), the ratio of steam to carbon in coal (ns/nc) and air pre-heating temperature, on gasification performance indices to which the high-temperature air/steam is used as gasifying agent were studied. The results showed that the effects of α and ns/nc on coal gasification performance indices are realized essentially by changing the gasification temperature. The value of α and ns/nc should be controlled in the optimal range from 0.23 to 0.25 and from 0.37 to 0.45, respectively. Under the permitted technological conditions, the higher the air pre-heating temperature, the better the gasification process of coal.