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- Title
Experimental Research on H-type Elliptical Finned Tubes in Low Temperature Boiler Gas Flue.
- Authors
Lei Ma; Fei Li; Jiayou Liu; Zhimin Li; Fengzhong Sun
- Abstract
Low pressure economizer, which works at relatively low temperatures, is now commonly-used in coal-fired boilers to enhance waste heat recovery. However, too low temperature of the flue gas will deteriorate the ash deposition and finally influences heat transfer characteristics and resistance characteristics of heat exchange tubes in low pressure economizer. In order to study the change regulations of heat transfer characteristics and resistance characteristics of heat exchange tubes usually used in low pressure economizer in low temperature flue gas, a field experiment is carried out with typical H-type elliptical finned tubes in the flue pipe of a 250MW fluidized-bed combustion boiler. Based on the observation and analysis, the ash deposition can be divided into three conditions: mere ash deposition condition, acid-ash coupling deposition condition, and water-ash coupling deposition condition. The change regulations of heat transfer and resistance characteristics of typical H-type elliptical finned tubes in acid-ash coupling deposition condition and water-ash coupling deposition condition are obtained, and the influence of tube bundle arrangement is illustrated. Finally, some suggestions on the design of tube bundle arrangement are provided for practical application.
- Subjects
HEAT transfer; ELLIPTICAL trainers; LOW temperature engineering
- Publication
International Journal of Simulation -- Systems, Science & Technology, 2016, Vol 17, Issue 9, p1.1
- ISSN
1473-8031
- Publication type
Article
- DOI
10.5023/IJSSST.a.17.09.01