吸收式热泵在造纸机干燥部的应用探讨

Discussion on Application of Absorption Heat Pump in Papermaking Drying Department

关键词:  造纸机干燥部  升温型吸收式热泵  余热回收  仿真计算

Key Words:papermaking  drying department  adsorption heat transformer  waste heat recovery  simulation calculation

摘要:造纸机干燥部蒸汽冷凝水系统通过循环利用二次蒸汽达到能量充分利用的目的，蒸汽热泵（蒸汽喷射器）是余热回收的关键设备。由于当前使用的蒸汽热泵对高压引射蒸汽的品位要求较高，冷凝水系统末段仍存在冷凝水排出温度较高、吨纸蒸汽消耗大等问题。升温型吸收式热泵（AHT, adsorption heat transformer）作为余热回收设备，可利用中间品位的余热与低温热源的热势差作为驱动，制取品位高于中间余热的热量，从而提高余热的利用率。本文在分析造纸机干燥部蒸汽冷凝水系统热力系统现状及吸收式热泵工作原理的基础上，将升温型热泵用于造纸机干燥部的余热回收，并给出了一种基于升温型吸收式热泵的多段供汽热力系统流程。LabVIEW仿真计算结果表明，应用吸收式热泵的造纸机干燥部蒸汽冷凝水系统具有更好的节能效果。

Abstract:The steam condensate system in the dryer section of the paper machine achieves the goal of full utilization of energy by recycling secondary steam. The steam heat pump (steam ejector) is the key equipment for waste heat recovery. Due to the high quality requirements of the high-pressure jet steam used in the current steam heat pump, there are still problems such as high condensate discharge temperature and large consumption of tons of paper vapor at the end of the condensate system. As a waste heat recovery device, a heat-generating absorption heat pump (AHT) can use the difference between the residual heat of the intermediate grade and the heat potential of the low-temperature heat source to obtain heat of the grade higher than the intermediate waste heat, thereby improving the utilization rate of the waste heat. Based on the analysis of the current situation of the thermal system of the steam condensate system in the dryer section of the paper machine and the working principle of the absorption heat pump, the heat-generating heat pump is used for the waste heat recovery of the dryer section of the paper machine, and a heat-increasing absorption heat pump is given. Multi-stage steam supply system process. The LabVIEW simulation results show that the steam condensate system of the paper machine drying section using the absorption heat pump has better energy saving effect.