在重型机械工厂中,用作采暖通风的热量是很大的。在我国东北-30℃地区,年产量在10万吨上下的厂子,所用的蒸汽量每小时约为180吨。在华北-15℃地区,10万吨年产量的厂子,所需的蒸汽量每小时约为120吨。每吨蒸汽以六元计,若每小时生产180吨蒸汽,则需耗费1080元,这个数字是很惊人的。工厂中有很多热车间,在生产过程中要产生大量有 In heavy machinery factories, the heat used for heating and ventilation is great. In the northeastern-30°C region of China, the annual output of the plant above and below 100,000 tons uses about 180 tons of steam per hour. In the North China -15°C area, an annual output of 100,000 tons requires about 120 tons of steam per hour. With six tons per ton of steam, if 180 tons of steam are produced per hour, it will cost 1,080 yuan. This figure is very alarming. There are many hot workshops in the factory, and a lot of