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在热电厂距其供热的城市市区较远时,供热系统在城区外的管线的供、回水温差由现在通常采用的50℃提高到100℃以上,此模式在国外于上个世纪就开始采用,因此是可行的。采用此模式可以使蒸汽输送和高温水输送共用一条管线。因此这是一个经济合理的模式。
When the thermal power plant is far away from the urban area where the heating power is supplied, the temperature difference between the supply and return water of the heating system outside the urban area is increased from 50 ° C. to 100 ° C. which is commonly used nowadays. This mode was adopted in the past century It is feasible to start adopting. With this mode, steam and hot water can be shared by one pipe. So this is an economic and reasonable model.