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1.情况介紹 在某企業的供热設計中,我們曾采用了压力回水的設計方法:戶外热力網的蒸汽回水,依靠其本身的过剩压力,直接返回到放在鍋爐房中离地标高約7～8公尺处的給水箱中,鍋爐房內不建地下水泵间。这样,不但可以节約下全部地下水泵間的土建投資、以及全部回水設备(回水箱、回水泵等)的投资,而且在以后長时期的操作中,减少了工人的劳动及經常的运轉費用;同时,采用压力回水,回水管中充滿着水,减少了管子的腐蝕。因之,回水管的使用寿命,也將比一般开式的自流回水管要長得多。該企業供热設計的具体条件如下:主要的建筑物及宿舍的采暖都采用130～40℃的热水,热水由鍋爐房集中供应。通風和部分建筑物的采暖采用3公斤/平方公分压力的飽和蒸汽。生产方面所需的蒸汽压力都在3公斤/平方公分以上。由于整个企業中沒有0.7公斤/平方公分压
1. Introduction In the heat supply design of a company, we used the design method of pressure backwater: the steam backwater of the outdoor heat network relies on its own excess pressure to return to the boiler house directly from the landmark level. About 7 to 8 meters in the water tank, there is no groundwater pump room in the boiler room. In this way, not only can the investment in civil construction of all groundwater pump rooms, as well as the investment in all return water equipment (return tanks, return water pumps, etc.) be saved, but also the labor and frequent transportation of workers will be reduced in the long-term operation. Transfer costs; At the same time, using pressure backwater, the return pipe is filled with water, reducing the corrosion of the pipe. Therefore, the service life of the return pipe will also be much longer than that of the general open type self-flow return pipe. The specific conditions for the heating design of the company are as follows: The heating of the main buildings and dormitories uses 130 to 40°C hot water, and the hot water is supplied from the boiler room. Ventilation and heating of some buildings use saturated steam at a pressure of 3 kg/cm2. The steam pressure required for production is above 3 kg/cm2. Since there is no 0.7 kg/cm2 pressure in the entire enterprise