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对于化工行业,由于高温烟气在流经换热设备时,温度不断下降,当达到某个温度时,气体中的酸性物质就会液化造成露点腐蚀。这种露点腐蚀会严重影响换热器的使用寿命。借鉴目前国外换热器领域的最新技术,针对化工行业中存在的露点腐蚀技术难题,在流道内增设了空气幕隔板,以在换热板边界层形成空气气墙的方式,达到提高换热板温度的作用,有效地防止露点腐蚀。通过对实际结构进行合理简化的基础上,在影响板式散热器腐蚀的主要部位建立了板式换热器温度场数值计算模型,利用CFD软件fluent对采用空气幕技术的板式换热器壁面温度进行数值模拟,得到了换热器流道的速度场、温度场数据,对比了传统的板式换热器与采用空气幕技术的板式散热器叉流单元与逆流单元的换热效果,研究结果表明空气幕技术可以有效地降低换热器入口处换热板的换热效率,提高换热板的板面温度,显著改善板式换热器的防腐性能。
For the chemical industry, when the high temperature flue gas flows through the heat exchange equipment, the temperature drops, when reaching a certain temperature, the acid gas in the gas will liquefy and cause dew point corrosion. This dew point corrosion can seriously affect the life of the heat exchanger. Drawing on the latest technology in the field of foreign heat exchangers, in view of the dew point corrosion technology existing in the chemical industry, an air curtain partition is added in the flow passage to form an air wall on the boundary layer of the heat exchange plate to achieve the purpose of improving heat exchange Plate temperature effect, effectively prevent dew point corrosion. Based on the reasonable simplification of the actual structure, the numerical model of temperature field of the plate heat exchanger was established in the main parts that affect the corrosion of the plate radiator. The CFD software fluent was used to calculate the wall temperature of the plate heat exchanger with the air curtain technology Simulation results show that the velocity field and the temperature field of the heat exchanger runner have been compared with those of the traditional plate heat exchanger and the air cooler with the air curtain technology. The results show that the air curtain The technology can effectively reduce the heat exchange efficiency of the heat exchange plate at the inlet of the heat exchanger, raise the plate surface temperature of the heat exchange plate, and remarkably improve the anticorrosion performance of the plate heat exchanger.