基于系统工程理念的锅炉深度降氮燃烧技术改造与仿真研究

Application and Simulation of LYCTWA Type Adherent Wind in Wall Type Opposed Boiler

针对某电厂600 MW墙式对冲燃烧锅炉NOx排放浓度偏高的问题,以系统工程理念出发,采取新型多功能旋流燃烧器耦合供风系统1:1全尺寸仿真模拟工作,通过对炉内主燃区、燃尽区空间内不同区域射流的优化组织和差异化设计,很好地保证了炉内火焰合理分布,形成主燃区火焰中心区域、过渡区和燃尽区域三区差异化燃烧,达到了强化煤粉着火、燃尽与深度降低NOx排放相统一的目的。改造后锅炉省煤器出口NOx排放浓度降幅达到55%以上;锅炉效率提高1%以上。

In order to solve the problem of high NOxemission from a 600 MW wall-type contra-firing boiler in a power plant, a full-scale simulation of a new type multi-functional swirl burner coupled air supply system was carried out based on the concept of systems engineering, the reasonable distribution of the flame in the furnace is well ensured through the optimized organization and differential design of the jets in different areas of the main combustion zone and the exhausted zone of the furnace, in order to strengthen the ignition of pulverized coal and reduce the NOx emission, three different combustion zones are formed in the main combustion zone: the center zone, the transition zone and the burnout zone. The third-party performance test results show that the concentration of NOx emission from the outlet of economizer of boiler is reduced more than 50%.The efficiency of the boiler is improved more than 1%.