The flue gas composition and the flue gas temperature at outlet of the economizer were tested, and the influence of flue gas recirculation (FGR) on the efficiency of the incinerator-waste heat boiler and NOx emission in a waste incineration power plant with a waste disposal capacity of 500 t/d was explored experimentally. The results indicate that the largest proportion of the total heat loss is the exhaust heat loss under different loads, and the next is the heat loss of slag. Within the test range, the efficiency of the incinerator-waste heat boiler increases from 80.26% to 80.42% as the ratio of the recirculating flue gas increases from 0 to 16.43%. The oxygen content in the flue gas and FGR have significant influence on NOx emissions. The NOx concentration at outlet of the economizer increases from 209.54 mg/m³ to 307.30 mg/m³, that is an increase of 46.65%, when the oxygen content at outlet of the economizer increases from 4.52% to 8.00%. Compared with the shutdown of FGR system, the NOx concentration at outlet of the economizer decreases from 209.54 mg/m³ to 126.15 mg/m³ when the FGR valve is fully opened. The results have important reference significance for the design of incinerator-waste heat boiler and the optimal operation of power plant.

测试了省煤器出口处的烟气成分和烟气温度，并研究了烟气再循环（FGR）对带有废物处理的废物焚烧发电厂中焚化炉-废热锅炉的效率和NOx排放的影响通过实验探索了500吨/天的产能。结果表明，总热损失的最大比例是不同负荷下的废热损失，其次是炉渣的热损失。在测试范围内，焚烧炉余热锅炉的效率从80.26％提高到80.42％，这是因为再循环烟气的比例从0增加到16.43％。烟气中的氧气含量和FGR对NOx排放有重大影响。省煤器出口处的NOx浓度从209.54 mg / m ^3增加当省煤器出口的氧气含量从4.52％增加到8.00％时，增至307.30 mg / m ³，即增加46.65％。与FGR系统关闭相比，在节能器的出口处的NOx浓度降低从209.54毫克/米³至126.15毫克/米³时，FGR阀完全打开。研究结果对垃圾焚烧锅炉的设计和电厂的优化运行具有重要的参考意义。