国产主型蒸汽机车都安装了混合式给水预热器(以下简称热水泵)。热水泵是不是有益的附属装置,本文就其利弊进行了讨论。热水泵是利用汽缸排出的一部分废汽来提高锅炉给水温度的一种余热利用装置。据介绍,装有热水泵的机车可节煤6～8％,节水10～15％。但是,我段的实践却并非如此。如:杭州至金华间货物运输,从五十年代初到1980年,使用的菲得型机车约30台,其中有的机车有热水泵,有的机车无热水泵。在客观条件基本相同的情况下,没有得出装有热水泵的机车的节煤率比没有装热水 Domestic main steam locomotive has installed a hybrid feed water preheater (hereinafter referred to as hot water pump). Hot water pump is not a useful attachment, this article discussed the pros and cons. Heat pump is the use of cylinder exhaust part of the exhaust to improve boiler feed water temperature of a waste heat utilization device. According to reports, the locomotive equipped with hot water pump can save 6-8% coal, water saving 10 ~ 15%. However, my practice is not the case. Such as: Hangzhou to Jinhua between the cargo transport, from the early 1950s to 1980, the use of the Philippine locomotive about 30 units, of which some locomotives have hot water pumps, and some locomotives without hot water pump. In the case of the same objective conditions, did not come to a locomotive equipped with hot water pump coal-saving rate than without hot water