ABSTRACT

It is a coupling solution for optimizing the materials with good thermal conductivity and anti-corrosive modified coating of flue-gas condensation heat exchangers. The paper experimentally studied the condensation heat transfer between the wet air and 3-D finned-tube heat exchanger surface in three different ways, i.e. non-coating, Ni-Cu-P organic pure-coating, and Ni-Cu-P chemical organic composite coating. Impacts of mass flow rate, moisture content, temperature of exhaust flue gas, and cooling water on the condensation heat transfer performance were investigated. The results showed that the heat transfer coefficient of the heat exchanger surface with a pure-coating layer achieves 3.1–7.4% higher compared to that with the composite coating. The pure-coating surface is inferior to the non-coating surface. The heat transfer coefficient of the copper-based heat exchanger achieves 30.1–47% higher compared to the steel-based surface. The condensate pH of modified surfaces heat exchangers is ranged from 3.08–7.17. Furthermore, the nondimensional correlations governing the flue-gas convection condensation heat transfer for different coating surfaces were established and validated with the experimental data. The validation indicates that the theoretical results are in good agreement with the experimental data.

摘要

它是一种耦合解决方案，用于优化具有良好导热性和烟气冷凝式换热器防腐涂层的材料。本文以三种不同方式对湿空气与3D翅片管换热器表面之间的冷凝传热进行了研究，即非涂层，Ni-Cu-P有机纯涂层和Ni-Cu-P化学有机涂层复合涂料。研究了质量流量，水分，废气温度和冷却水对冷凝传热性能的影响。结果表明，与复合涂层相比，具有纯涂层的换热器表面的传热系数提高了3.1–7.4％。纯涂层表面劣于非涂层表面。与钢基表面相比，铜基热交换器的传热系数提高了30.1–47％。改进型表面热交换器的冷凝水pH值范围为3.08-7.17。此外，建立了控制不同涂层表面烟气对流冷凝热传递的无量纲相关性，并通过实验数据进行了验证。验证表明理论结果与实验数据吻合良好。建立了控制不同涂层表面烟气对流冷凝热传递的无量纲相关性，并用实验数据进行了验证。验证表明理论结果与实验数据吻合良好。建立了控制不同涂层表面烟气对流冷凝热传递的无量纲相关性，并用实验数据进行了验证。验证表明理论结果与实验数据吻合良好。