在一般的旧式小型锅炉中,锅炉后部受热面往往只有省煤器。因而锅炉的热损失一般是比较大的,几乎平均有20～25％,甚至30％以上。在小型锅炉的热损失中,最大的一部分就是排烟热损失。这个损失的大小,不但与锅炉结构有关,而且与锅炉运行条件有关。旧式小型锅炉普遍采用立式滑管生铁省煤器。但是,这种型式的省煤器最大缺点是:排烟温度很高,排烟热损失很大。为了最大程度的利用原有省煤器的受热面,我厂 In the old old-style small boilers, the rear heating surface often only economizer. Therefore, the boiler heat loss is generally relatively large, almost an average of 20 to 25%, or even 30%. In the heat loss of small boilers, the biggest part is exhaust heat loss. The size of this loss, not only with the boiler structure, but also with the boiler operating conditions. Old small boilers commonly used vertical tube pig iron economizer. However, the biggest drawback of this type of economizer is that: the exhaust gas temperature is very high, exhaust heat loss is great. In order to maximize the use of the original economizer heating surface, I plant