锅炉高温烟气引射器结构设计及计算

Design and Calculation of Structure of High Temperature Flue Gas Ejector in Boiler System

锅炉烟气再循环的高温烟气引射器,其工作机理受到普通物理学、流体力学、热工学相关理论的强力支持,能用常温低压空气引射炉膛出口1000℃以上的高温烟气,混合后形成压力为1000±100 Pa、温度为300±30℃、氧含量为16%+2%的高温低氧助燃气体。在超低过量空气系数下,锅炉燃烧效率提高、污染物生成降低,对于生活垃圾焚烧发电锅炉具有较高的应用价值。用一元可压缩气体恒定流动的动量方程、连续方程和能量守恒方程,对不同物性气流在合流热力过程中的性能参数进行了理论分析与计算,同时对高温烟气引射器的结构设计作了介绍,为工程应用提供了技术支持。

The working mechanism of high temperature flue gas ejector for high temperature flue gas recirculation is strongly supported by general physics,hydrodynamics and thermal engineering theories.It can make normal temperature and low pressure air eject and entrainment above 1000 degrees Celsius high temperature flue gas and mix it into high temperature and low oxygen combustion-supporting gas with pressure of 1000±100 Pa,temperature of 300±30℃and oxygen content of 16%+2%.Under the condition of ultra-low excess air coefficient,the combustion will be more complete,the generation of pollutants will be very low,the energy saving and emission reduction will be greatly increased at the same time.Especially for domestic waste incineration power generation boilers with large excess air coefficient and much attention to pollutant emission,it has very strong application value.However,there is no relevant report on research and application in domestic and foreign markets so far.With the help of momentum equation,continuity equation and energy conservation equation of one-dimensional compressible gas steady flow,the performance parameters of different physical flow in the process of combined flow thermodynamics are analyzed and calculated theoretically.At the same time,the structural design of high temperature flue gas ejector is introduced empirically,it provides technical support for its design and engineering application.