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本文对氨水吸收式制冷系统中主要部件建立稳态集总参数模型进行数值模拟,从定性和定量角度分析氨气浓度对制冷系统性能的影响,并优化影响精馏塔性能的进料状态、发生温度和回流比等参数。研究结果表明,对精馏塔采用塔板效率修正非理想性的平衡级模型,会使设备放大效应明显改善;提馏段对系统性能影响较大,精馏段对精馏效果影响较大;随着发生温度的升高,系统的制冷量先增大,而当发生温度超过最大值时,系统性能下降;并且相似地,存在一个使得系统性能最佳的回流比;不同回流比条件下均有一个最佳发生温度存在,在每个发生温度条件下也能找到最适宜的回流比。
In this paper, the steady-state lumped parameter model of the main components in the ammonia absorption refrigeration system was numerically simulated. The effects of ammonia concentration on the performance of the refrigeration system were analyzed qualitatively and quantitatively. The feed conditions affecting the performance of the rectification column were optimized. Temperature and reflux ratio and other parameters. The research results show that the rectifying tower adopts the equilibrium model of non-ideal of plate efficiency correction, which can obviously improve the equipment amplification effect. The stripping section has a great influence on the system performance, and the rectifying section has a great influence on the rectification effect. As the temperature increases, the system’s cooling capacity first increases, and when the temperature exceeds the maximum, the system performance decreases; and similarly, there is a reflux ratio that results in the best system performance; at different reflux ratios There is an optimum occurrence of temperature, in each occurrence of temperature conditions can find the most appropriate reflux ratio.