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Numerical study of fly ash deposition process in low temperature economizer under SCR conditions
Shuangcheng Fu,Gang Cao,Guofu Ou,Faqi Zhou,Luyu Li 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.7
After the boiler of a thermal power plant in Nanjing was reformed for denitrification, the clogging of flyash particles occurred near the support beam of the economizer. The critical speed criterion under different workingconditions was constructed by Fluent custom code (UDF), and the change of fly ash deposition on the support beamof the economizer was simulated without ABS and with ABS. At the same time, the influence of the fin layout structureon the movement of smoke and fly ash particles was analyzed. The results show that the stagnation of fly ash particleson the supporting beam is the main cause of sediment clogging. Due to the production of ABS in the process ofdenitrification, the adhesion of fly ash particles is intensified. At the same time, the fin structure on the support beamhinders the lateral movement of fly ash particles, which causes the growth of clogged fly ash near the support plate. Onthis basis, an optimization plan for the fin structure is proposed, which improves the flue gas flow conditions andavoids the occurrence of clogging and growth of fly ash.
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