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当热源为蒸汽锅炉时为了制备供暖或生活用热水,一般多采用表面式换热器,即汽水换热器或容积式换热器等,其凝结水经过疏水器,有时还要经过水水预热器放出余热后送至凝结水箱,经给水泵打入锅炉。这样的回水方式比较复杂,耗能量也大。一、在国外资料中早就有低压蒸汽锅炉与换热器直接连接,重力回水的作法。我国在50年代初就有工程采用这种作法。 60年代初我们开始在北京的一个小工程中试用高压蒸汽锅炉与容积式换热器直接
When the heat source is a steam boiler, in order to prepare heating or domestic hot water, a surface heat exchanger is generally used, namely, a steam heat exchanger or a volumetric heat exchanger, and the condensed water passes through the steam trap and sometimes passes through water and water. After the preheater releases heat, it is sent to the condensate tank and is pumped into the boiler via the feed pump. This type of backwater is more complicated and consumes more energy. First, in foreign materials, there has long been a direct connection between a low-pressure steam boiler and a heat exchanger, and gravity backwater practice. In the early 1950s, our country used this practice in its projects. In the early 1960s, we began testing high-pressure steam boilers and positive displacement heat exchangers in a small project in Beijing.