制浆造纸蒸发温水余热的回收利用

Reuse of Waste Heat of Warm Water Produced at Evaporation Stage of Alkali Recovery Plant

关键词:  制浆造纸  蒸发温水  余热回收  循环利用  节能减排

Key Words:pulp and paper  warm water evaporation  waste heat recovery  recycling  energy conservation and emissions reduction

摘要:通过对制浆造纸生产工艺用能的分析,冬季二级泵房供水温度不到20℃,与正常供水温度25~30℃相比相差5~10℃,造成冬季整个生产系统能耗高。而碱回收蒸发板式冷凝器产生的温水(水温45～50℃)大部分通过冷却塔进行冷却降温至30℃以下再循环使用,温水的余热散发到大气中,造成余热损失,且增加循环水站冷却塔系统能耗。现提出蒸发温水余热回收利用的一种方式,将蒸发温水回流到二级泵房清水池,提高冬季生产用水水温,降低生产能耗,节能减排效果显著。

Abstract:The analysis of pulp and paper production process indicated that, the temperature of water supplied from secondary pumping station is lower than 20℃ in winter. It is 5~10℃ lower compared with the water temperature 25~30℃ in summer, which causes the whole production systems at high energy consumption in winter. On the other hand most of the warm water generated from plate heat exchange in the alkali recovery plant was recycled after cooling down to lower than 30℃, it also causes the lose of water heat and increasing energy consumption of (water temperature 45～50℃) the circulating water station cooling tower system. This paper suggested the waste water from evaporation stage back into the clear water reserviors of secondary pumping,to improve the production water temperature in winter, reduce production energy consumption．