摘要
为降低大气式燃烧燃气采暖热水炉的NOx排放,通过改变燃烧器火排数量、喷嘴直径,增加二次空气流动阻力,改变引风机功率,更改空气限流环进气口直径,进行了相关试验。得出降低大气式燃气采暖热水炉NOx排放量的方法:增加燃烧器火排的数量,保持总热输入一致,从而降低单个火排的热输入;在保持热输入不变的基础上,减小喷嘴直径,NOx的排放量随着喷嘴直径的缩小而减少;在燃烧室两侧增加挡风板,在燃烧器前增加分配网板,合理分配一次空气与二次空气的比例;采用功率较大的引风机及加大空气限流环进气口直径,提高烟气流速,以缩短烟气在高温区的停留时间。
An experimental system of submerged combustion in cold state was established,air instead of flue gas,air tube pressure instead of combustion chamber pressure. The relationship between the relative pressure fluctuation limit amplitude of the submerged combustion chamber and the immersion depth,air flow rate,bubbling pore diameter and bubbling pore distribution was studied. The mathematical model of the relative pressure fluctuation limit amplitude of the combustion chamber was fitted by SPSS software,and the accuracy of the model was verified under the hot experimental conditions. The cold state experiments show that the variation trends of the relative pressure fluctuation limit amplitude of air tubes with the air flow rate are basically the same at different immersion depths. The maximum limit amplitude increases with the increase of the air flow rate. The minimum limit amplitude (negative value) decreases with the increase of the air flow rate. The variation trends of the relative pressure fluctuation limit amplitude of air tubes with immersion depths are basically the same at the same air flow rate. The maximum limit amplitude significantly decreases with the increase of the immersion depths. The minimum limit amplitude significantly increases with the increase of the immersion depths. When the immersion depth is constant,the maximum limit amplitude becomes larger as the diameter of the bubble pore increases,and the minimum limit amplitude decreases as the diameter of the bubbling pore increases. At the same air flow rate,the maximum limit amplitude decreases as the bubbling fullness increases,and the minimum limit amplitude becomes larger as the bubbling fullness increases. The mathematical model of the relative pressure fluctuation limit amplitude in combustion chamber has high accuracy,which can reflect the relationship between the relative pressure fluctuation limit amplitude and each related variable.
作者
梁友高
钟家淞
YANG Yang;SHI Yongzheng
出处
《煤气与热力》
2019年第6期40-42,10043-10044,共5页
Gas & Heat
关键词
大气式燃烧燃气采暖热水炉
NOX排放
火排
喷嘴
引风机
空气限流环
submerged combustion
pressure fluctuation in combustion chamber
air flow rate
immersion depth
bubbling pore diameter
bubbling pore distribution
