Environmental Sanitation Engineering ›› 2025, Vol. 33 ›› Issue (1): 98-102.doi: 10.19841/j.cnki.hjwsgc.2025.01.013

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Engineering Practice and Analysis of Exhaust Gas Recirculation Technology for Waste Incineration Power Generation Project

YAN Haowen， ZHANG Bei, WANG Zhiqiang， LONG Jisheng， JIN Xingqian， GUO Xinwei   

  1. 1. College of Energy and Power Engineering, North China University of Water Resources and Electric Power; 2. Shanghai SUS Environment Co. Ltd.
  • Online:2025-03-04 Published:2025-03-04

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Abstract: In order to explore the effects of exhaust gas recirculation system on the combustion characteristics of garbage incinerators and the reduction of NOx emission concentration, taking a domestic waste incineration plant in Hebei as an example, the engineering experiments were used to study the effects of operating factors such as exhaust gas recirculation ratio and oxygen concentration on furnace temperature, CO concentration, as well as NOx concentration. The results indicated that when using existing waste incineration processes and equipment, with a exhaust gas recirculation ratio of 15% and the oxygen concentration at the outlet of the economizer decreased to below 3.8%, the CO concentration could not be stably controlled below 50 mg/m3, posing a risk of environmental non-compliance. The trend of NOx concentration and oxygen concentration was consistent, and it increased with the increase of oxygen concentration. At the same time, when the oxygen concentration at the outlet of economizer was 4.5%-5.0%, the average NOx concentration and the maximum concentration decreased with the increase of the proportion of exhaust gas recirculation. The furnace temperature decreased by about 70 ℃ with the increase of the exhaust gas recirculation ratio.

Key words: municipal solid waste, incineration, exhaust gas recirculation, engineering tests, NOx

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