顶燃式热风炉高温低氧燃烧技术

NOx是制约热风炉实现高风温长寿的主要技术障碍。为有效抑制和降低热风炉燃烧过程生成的NOx,研究分析了NOx的生成机制,运用热力型NOx生成模型计算了热风炉燃烧过程NOx生成速率和生成量,开发设计了基于高温低氧燃烧技术(HTAC)的新型顶燃式热风炉,采用CFD仿真模型对比研究了常规热风炉和高温低氧热风炉的燃烧过程和特性。计算得出2种热风炉的温度场分布和火焰形状、浓度场分布以及NOx的浓度分布。研究结果表明,高温低氧热风炉的温度场分布均匀,在相同拱顶温度下,NOx生成量仅为80×10-6,比常规热风炉降低约76%。高温低氧热风炉可以获得更高的风温并可以有效减少NOx排放,实现热风炉高效长寿和节能减排。

High Temperature Air Combustion of Dome Combustion Hot Blast Stove

NOx is the major technical barrier to increase hot blast temperature and prolong campaign life of hot blast stove at present.In order to restrain the amount of NOx formation during combustion process in the hot blast stove,the generation mechanism of NOx production was investigated,and NOx generation rate and amount in hot blast stove was calculated by means of thermodynamic generation model.A new dome combustion stove was developed based on high temperature air combustion(HTAC) technology.A comparison on the combustion process and characteristic of conventional hot blast stove and HTAC hot blast stove was performed by application of CFD simulation model.Temperature and concentration field distribution,flame shape and NOx concentration distribution of two kinds of stove was calculated.The result shows quite symmetrical HTAC stove temperature field distribution.Under the same dome temperature,NOx generation is 80×10-6 only,reduced by approx 76% in comparison with conventional stove.HTAC hot blast stove can get higher temperature and decrease NOx emission efficiently,as well as realize long campaign life of hot blast stove and energy-saving and emission reduction.