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内热型再生器作为一种高效溶液再生装置其性能主要由溶液加热形式、热水流向、传热单元数及溶液空气相对流向等决定。该文基于装置内溶液、空气、热水三者间的能量和质量守恒,分别建立预热、内热再生器在2种热水流向下的顺流、逆流、叉流的数学模型,并进行理论性能模拟和比较。数值模拟发现大部分工况下内热型再生器再生性能为预热型的2~4倍,且受溶液–空气流量比和热水–空气流量比影响较大。热水与溶液流向相反时的再生性能要优于相同时,最大可高于5%。再生性能随溶液–空气传热单元数和溶液–热水传热单元数的增大而提高,且存在性能增长最快的组合曲线。另外再生过程中大部分情况下溶液和空气呈顺流时的出入口浓度差最大,叉流为其0.97倍左右,逆流最低时仅达到其0.87倍左右。该文研究结果为内热型溶液再生器设计优化提供理论依据。
The performance of internal regenerator as an efficient solution regenerator is mainly determined by the form of solution heating, the flow of hot water, the number of heat transfer units and the relative flow of solution air. Based on the conservation of energy and mass between solution, air and hot water in the device, mathematical models of forward flow, reverse flow and cross flow of preheating and internal regenerator under two kinds of hot water flow are established respectively. Performance simulation and comparison. Numerical simulations show that the regeneration performance of internal regenerator is 2-4 times higher than that of preheating type under most operating conditions and is greatly influenced by solution-air ratio and hot water-air ratio. When the hot water and the solution flow reversely, the regeneration performance is better than the same, the maximum can be higher than 5%. Regeneration performance increases with the number of solution-air heat transfer units and solution-hot water heat transfer units, and there is a combination curve with the fastest performance growth. In addition, in most of the regeneration process, the difference in concentration between the inlet and outlet of the solution and the air is the largest, the cross flow is about 0.97 times and the countercurrent is only about 0.87 times lower. The results of this paper provide a theoretical basis for the design and optimization of the internal thermal solution regenerator.