Research on the Arrangement Scheme of Spirally Twisted Tape Inserts in a Grate Furnace

Chen Yang, Jingxian Kong, Xinji Chen, Zhijiang Jin and Jinyuan Qian ()
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Chen Yang: China Ship Scientific Research Center, Wuxi 214082, China
Jingxian Kong: Institute of Process Equipment, College of Energy Engineering, Zhejiang University, Hangzhou 310027, China
Xinji Chen: Institute of Process Equipment, College of Energy Engineering, Zhejiang University, Hangzhou 310027, China
Zhijiang Jin: Institute of Process Equipment, College of Energy Engineering, Zhejiang University, Hangzhou 310027, China
Jinyuan Qian: Institute of Process Equipment, College of Energy Engineering, Zhejiang University, Hangzhou 310027, China

Energies, 2024, vol. 17, issue 21, 1-23

Abstract: To eliminate the flow dead zone and homogenize the asymmetric flow field of a grate furnace, spirally twisted tape inserts (STTIs) with a pitch ratio of 1.5 were installed in the vertical flues of an SCL1000-13.5/450 grate boiler. The arrangement schemes found to be present inside the chosen 1000 t/d grate furnace, determined using the orthogonal experimental method, included separate installation in chamber II, separate placement in chamber III, and simultaneous arrangement in both chamber II and chamber III. The effects of row spacing H , column spacing W , and mounting angle φ were investigated by means of the practicable and feasible numerical simulation method. With a focus on the uniformity degree of the flue gas, the results showed that temperature distribution is directly correlated with the velocity field. When it comes to the uniformity of the flow field, the exclusive use of STTIs in chamber II was better than that in chamber III. Under the optimal combination scheme of STTIs in both chamber II and chamber III (scheme N 3 23 ), the exhaust gas temperature reached the minimum value and the uniformity index of temperature increased to the range of 0.994~0.997. The findings in this work could provide a reference for the optimization of the flow field in a grate furnace.

Keywords: grate furnace; numerical simulation; spirally twisted tape inserts (STTIs); uniformity of flow field (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: 2024
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