流化床常压空气部分气化和半焦燃烧的试验研究

为进行煤的多联产方案研究，在1 MW循环流化床热电气多联产试验装置上，选取兖州煤、大同煤为试验煤种进行了部分空气气化和半焦燃烧试验。试验结果表明，空气部分气化方案得到的煤气热值较低，为3~5 MJ/m3，在气化炉中的碳转化率为40%~70%，剩余半焦被送入循环流化床反应器中燃烧，该系统的总体转化效率为90%左右。气化炉床层温度对气化炉碳转化率影响较大，随着温度升高其碳转化率明显提高，而燃烧炉燃烧效率呈下降趋势。石灰石的加入除了对焦油的裂解有一定的促进作用外，还具有脱除硫化氢作用，当[Ca]/[S]为3时，脱硫效率为90%。气化炉的给煤量、燃烧炉运行温度随气化炉鼓风温度提高而增加。

Experimental Study on Combining Partial Gasification With Air on a Fluidized Bed at Atmospheric Pressure and Semi-coke Combustion

For making the investigation on cogeneration scheme, experiments on coal partial gasification with air and semi-coke combustion with Yanzhou coal and Datong coal as fuel were made on the 1 MW pilot plant test facility which consists of a fluidized bed gasifier, a circulating fluidized bed (CFB) combustor, flue gas and fuel gas clean and cool system, data acquisition and control system. The results show that, with air as gasification agent, the system can produce 3~5 MJ/m3 low heating value gas, fuel conversion efficiency attains 40%~70% in the gasifier, and the residue was converted in the combustor and total conversion efficiency in the system is over 90%. With the bed temperature of the gasifier raising, the carbon conversion efficiency in the gasifier increases and the combustion efficiency of the combustor decreases. CaCO3 has an effective effect on tar cracking and removal of H2S in the gasifier. The sulfur removal efficiency attains 90% with Ca/S molar ratio 3. The fuel feed rate of the gasifier and the temperature of the combustor increase with the air temperature blown into the gasifier increasing.