使用冷凝水(shui)與生(sheng)蒸汽冷凝水(shui)預(yu)熱(re),利用高溫凝水(shui)顯熱(re)的回收。一效蒸發器中出的凝水溫度較高,直接排放浪費了大量熱水的顯熱,利用閃蒸的技術,可以進一步回收高溫熱水的能量。一效的凝水進入二效加熱器中,由于存在壓差,高溫凝水進入低壓狀態出現閃蒸的現象,同時凝水溫度降低,回收了高溫凝水的部分熱量。生蒸(zheng)(zheng)汽(qi)(qi)為(wei)高壓(ya)(ya)飽和(he)蒸(zheng)(zheng)汽(qi)(qi),生蒸(zheng)(zheng)汽(qi)(qi)壓(ya)(ya)力較高,需要(yao)對生蒸(zheng)(zheng)汽(qi)(qi)進(jin)行(xing)(xing)減(jian)(jian)壓(ya)(ya),生蒸(zheng)(zheng)汽(qi)(qi)經過減(jian)(jian)壓(ya)(ya)閥變為(wei)低壓(ya)(ya)飽和(he)蒸(zheng)(zheng)汽(qi)(qi),進(jin)入一效蒸(zheng)(zheng)發(fa)(fa)(fa)器作為(wei)加熱(re)熱(re)源,一效降(jiang)膜(mo)蒸(zheng)(zheng)發(fa)(fa)(fa)器的二次蒸(zheng)(zheng)汽(qi)(qi)進(jin)入二效蒸(zheng)(zheng)發(fa)(fa)(fa)器中作為(wei)加熱(re)熱(re)源,二效蒸(zheng)(zheng)發(fa)(fa)(fa)器的二次蒸(zheng)(zheng)汽(qi)(qi)作為(wei)三效的加熱(re)熱(re)源,蒸(zheng)(zheng)汽(qi)(qi)循環利用,減(jian)(jian)少(shao)了生蒸(zheng)(zheng)汽(qi)(qi)的消耗,降(jiang)低了運行(xing)(xing)成(cheng)本。