关键词: 受热面, 传热, 数值模拟, 实验验证

Abstract:

Confronted with low-quality heat source, such as high ash contents, discontinuity and instability in waste heat recovery, innovations are required in the structure of typical heat transfer surface. In this paper a novel structure with rhombus heat transfer surface was presented. This heat transfer surface was efficient in both waste heat recovery and ash blowing. In the heat transfer process, the new heat transfer surface showed similar performance with the staggered tubes arrangement, for instance enhanced heat transfer and relatively large fluid flow resistance and higher convection heat transfer coefficient in the shell side. In the dust blowing process, this surface performed like the aligned tubes arrangement, which was easy to clean and efficient in dust blowing. Numerical simulation and experimental investigation were conducted to obtain heat transfer and flow performance of the new structure. Both numerical and experimental results indicated that the new structure met basic requirements of waste heat recovery, achieving highly efficient heat transfer along with convenience of dust cleaning and descaling.

Key words: heat transfer surface, heat transfer, numerical simulation, experimental validation