工业制冷系统组合式热回收节能方案研究

Study on a combined heat recovery energy-saving option for industrial refrigeration system

为改善氨工业制冷系统的运行能效和经济性,对螺杆式制冷机组系统,提出一种回收压缩机氨蒸气显热部分冷凝热和油冷却器润滑油余热的组合式热回收方案。该方案在压缩机排气管上增设氨热回收器,在油分离器和油冷却器之间增设油热回收器。理论计算表明,热回收系统所回收的总热负荷相较于压缩机输入功率的百分比Rt,p可达84. 2%~99. 6%,而组合式热回收系统的综合性能系数COPc比无热回收制冷系统的COP高29. 0%~62. 5%。系统改造实例表明,本组合式热回收方案节能效益显著,系统改造投资的静态回收期较短。

To improve system operating energy and economic efficiencies,a combined heat recovery option that could reclaim the excessive oil heat from oil cooler and the sensible part of condensing heat of ammonia vapor from compressor was presented for ammonia industrial refrigeration system using screw compressor. This option needed an ammonia heat recovering heat exchanger to be added in the discharge line of compressor,and a oil heat recovering heat exchanger to be added between oil separator and oil cooler. Theoretical calculation indicates that Rt,p,which is the percentage of total heat recovered compared with compressor input power,can be 84. 2% ~ 99. 6%,and the comprehensive coefficient of performance COPc of the combined heat recovery system can be 29. 0% ~ 62. 5% higher than the COP of the system without such a heat recovery system. Renovated practical example system shows that this combined heat recovery option can have significant energy-saving and economic effect,and the static payback period for renovation investment is short.