秸秆成型燃料锅炉炉膛气体浓度分布规律的试验与分析

Experimental study of gas concentration distribution in the hearth of straw briquette boiler

为了评价秸秆成型燃料锅炉设计与运行水平,实现锅炉优化设计与安全、稳定、经济运行。采用直接测量方法,在锅炉正常燃烧情况下(排烟处过剩空气系数pαy为2.2),对该文作者设计的双层炉排秸秆成型燃料锅炉炉膛气体浓度分布进行试验,试验得出锅炉炉膛内CO2,O2,CO气体浓度在炉膛高度方向及深度方向的变化规律,并以此分析燃料层内干燥、干馏、氧化、还原、灰渣层厚度。在pαy为2.2时双层炉排秸秆成型燃料锅炉炉膛气体的浓度分布较合理,实现了锅炉安全、稳定、经济运行,锅炉的燃烧效率可达98.20%,热效率可达74.39%;同时该锅炉具有消烟除尘作用,为秸秆成型燃料锅炉燃烧设备进一步的优化设计及运行调整提供依据。

To estimate the design and function level of straw briquette boiler, realize secure, stabile and economical operation, adopting direct measurement method and under the normal working condition （αpy=2.20）, the double fire grates boiler designed by the authors has been tested. The gas concentration distribution rule of varying with height and depth of the hearth was worked out, thickness of dryness, distillation, oxidation, reduction and dreg layer were analyzed. The gas concentration distribution is more rational on this condition. Secure, stabile and economical operation of the boiler was realized. Combustion efficiency of the boiler reached 98. 20%, thermal efficiency reached 74.39%. Meanwhile, the boiler has the function of removing smoke. It lays foundation for optimization design of burning equipment and running adjustment.