旋流燃烧煤粉锅炉主要烟气组分及分布规律试验

Experiments on Main Flue Gas Components and Distribution Regularities for Pulverized Coal-fired Boiler with Swirling Combustion

为了研究对冲锅炉中影响H2S生成的因素,在不同负荷、不同氧量设定值下对侧墙近壁面的烟气组分及温度进行了测量。试验结果表明:水冷壁对靠近侧墙的燃烧器有冷却作用,对其他燃烧器影响不大;还原性气氛是H_2S存在的必要条件,炉膛的空气分级燃烧会造成燃烧器区域的还原性气氛;当侧墙附近O_2和NO体积分数都很低时,煤粉中的硫容易生成H_2S,不容易生成SO_2,随着气流冲刷壁面,造成水冷壁的高温腐蚀;在满负荷和氧量设定值较高时锅炉侧墙的H_2S比较少,而当氧量设定值较低时侧墙附近的H_2S会急剧增加。

In order to study factors influencing generation of H_2 S in opposed-firing boiler,flue gas components and temperatures closed to the side wall are measured with different loads and setting values of oxygen contents.Experimental results indicate that the water cooling wall plays a cooling role on combustor closed to the side wall while has little effect on other combustors.Secondly,reducing atmosphere is the essential condition for existence of H_2 S and fractional combustion of air in the furnace may produce reducing atmosphere in combustor areas.Thirdly,when volume fractions of O_2 and NO near to the side wall are both low,sulfur in pulverized coal may produce H_2 S instead of SO_2,and gas flow washing the wall may cause high temperature corrosion of the water cooling wall.At last,H_2 S of the side wall of the boiler is less at the time of full load and high setting values of oxygen contents while H_2 S closed to the side wall may sharply increase when setting values of oxygen contents are lower.