Analysis of Ignition Characteristics and Influencing Factors of Combustible Fly Ash in Boiler Start-Up Stage Flue Gas

Jianle He, Dong Guo, Jianli Zhang, Pengfeng Yu, Mengsong Shen and Guangxue Zhang ()
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Jianle He: Huadian Electric Power Research Institute Co., Ltd., Hangzhou 310030, China
Dong Guo: Huadian Electric Power Research Institute Co., Ltd., Hangzhou 310030, China
Jianli Zhang: Huadian Laizhou Power Generation Co., Ltd., Yantai 261441, China
Pengfeng Yu: Huadian Electric Power Research Institute Co., Ltd., Hangzhou 310030, China
Mengsong Shen: Institute of Energy Engineering, China Jiliang University, Hangzhou 310018, China
Guangxue Zhang: Institute of Energy Engineering, China Jiliang University, Hangzhou 310018, China

Energies, 2023, vol. 16, issue 17, 1-12

Abstract: In order to realize the full-time denitration of a boiler, high-temperature flue gas needs to be introduced when SCR is conducted during the boiler start-up stage, and there is a fire risk due to the presence of combustible fly ash at this time. Therefore, research on reburning and the explosion risk of tail flue gas encountering high-temperature flue gas during start-up and shutdown was carried out. A small testbed was designed to record the temperature of the flue gas and the composition of the flue gas before and after the test, and the ignition characteristics of combustible fly ash in the flue gas were systematically studied. The ignition temperature of combustible fly ash in various conditions was obtained, the ignition characteristics of combustible fly ash in the airflow were analyzed, and the effects of combustible gas, high-temperature flue gas temperature, and fly ash composition on ignition were also analyzed. The results show that the flue gas temperature in the test section was about 400 °C, the low-temperature flue gas temperature increased from 650 °C to 813 °C, and the combustible fly ash did not ignite regardless of whether alcohol was added as a combustible gas component. When the volatile content of combustible fly ash was 10~26.7%, the ignition temperature was 660~760 °C. The lower the volatile content of combustible fly ash was, the higher the ignition point was. When alcohol was added as a combustible component of gas, the ignition point decreased by about 50 °C. The critical ignition temperature of combustible fly ash in this test was lower than that under actual power plant operation conditions.

Keywords: explosion risk; high-temperature flue gas; combustible fly ash; ignition temperature (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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