Comparison of NOx Emission Reductions with Exclusive SOFA and the Combination of SOFA and CCOFA on Tangentially-fired Boilers
The paper deals with air staging experiments on two full-scale, tangentially fired boilers burning bituminous coal.,unit A boiler with separated overfire air (SOFA), unit B boiler with the combination SOFA and close coupled overfire (CCOFA). We compared the NOx emission reductions of the two boilers. The influencing factors of NOx emission including the oxygen levels, the distribution types of pulverized coal and the variations of OFA damper positions were investigated. The NOx emission from unit B boiler was apparently lower than that from unit A boiler (lower 22％ or so). The heat efficiency of unit B boiler was higher than that of unit A boiler (higher 0.7％ or so). The maldistribution type of pulverized coal was conducive to reduce NOx emission from unit A boiler, but the decrease of NOx emission followed the decrease of boiler heat efficiency. The uniform distribution type of pulverized coal could obtain not only the lowest NOx emission but the highest heat efficiency on unit B boiler. There wasn’t an optimum adjustment of SOFA damper position on unit A boiler, and both NOx emission and boiler heat efficiency decreased with the increase of the opening extent of SOFA. However, there was an optimum matching adjustment of CCOFA and SOFA damper positions in unit B boiler.
NOx emission SOFA CCOFA
Sen Li Tongmo Xu Shien Hui Houzhang Tan Qulan Zhou Hongli Hu
School. of Energy and Power Engineering, XiAn Jiaotong University，Xian 710094, PR China
国际会议
2007杭州国际动力工程会议(The International Conference on Power Engineering 2007)
杭州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）