【摘要】 为了节能减排,采用有机朗肯循环(ORC)回收纺织厂空压机压缩后的高温热废气并发电,设计新型排气换热器内部流体流道结构,建立流道内流体流速、压力、湍动能以及湍流耗散率等流体数学模型.利用CFD软件进行数值模拟,分析内部流体的流动及换热情况.分析结果表明:内部流体流动湍流性能增强,换热效果明显;提高热空气流速和降低工质流速时传热性能更好;较大的翅片尺寸换热系数较小,换热效率低;排气换热器的换热效率最高可达95.3%.更多还原

【Abstract】 In order to energy-saving emission reduction, the high temperature exhaust gas compressed by air compressor in textile mill is recovered to generate electricity by organic Rankine cycle(ORC). The internal fluid flow structure in a new exhaust heat exchanger was designed, and the fluid mathematical model for flow velocity, pressure,turbulent kinetic energy and dissipation rate of turbulent flow in the pipes was created. The flow and heat transfer of the internal fluid were analyzed by CFD software. The result showed that the effect of heat transfer is obvious with the increase of turbulence in internal fluid flow. The heat transfer performance is better with the higher velocity of hot air and the lower velocity of refrigerant. The larger fin size leads to smaller heat transfer coefficient and lower heat transfer efficiency. The heat transfer efficiency of the exhaust heat exchanger is up to 95.3%.更多还原