A central heating system with large temperature difference using industrial waste heat

Abstract

The invention relates to a heating system utilizing industrial afterheat and discloses a large-temperature difference centralized heating system utilizing industrial afterheat. The large-temperature difference centralized heating system utilizing industrial afterheat disclosed by the invention comprises an absorption type heat pump heating system of a power plant, a heat cooling tower, a main heating region of an urban center and the like. An electric heat pump, an absorption type heat pump and a basic heater are arranged in the power plant for heating backwater of a heat supply network to be 130 DEG C from 30 DEG C and outputting the backwater. the cascaded heat exchange principle is utilized at the tail end of a user heating station to centrally and uniformly treat different heat user demands in the heat cooling tower, so that the heating temperature difference of the heat supply network is increased, and the heating temperature difference is increased by about more than one time compared with the temperature difference of the existing heat supply network, therefore, the conveying capability of the heat supply network is greatly increased. Meanwhile, the heat cooling tower can occupy no area, so that the heating system has the advantages of little investment, convenience in transportation, capability of on-site assembly and usability in winter and summer.

Description

technical field [0001] The invention relates to a heat supply system utilizing industrial waste heat, in particular to a centralized heat supply system with large temperature difference utilizing the principle of cascade heat exchange. Background technique [0002] At present, high-temperature hot water produced by large centralized heat source power plants often needs to travel a long distance to reach heat users. For example, reducing the return water temperature of the high-temperature hot water network and increasing the temperature difference between supply and return water can reduce the flow of hot water delivery, thereby reducing the initial investment in transmission and distribution pipelines, and reducing the power consumption of water pumps during system operation; at the same time, such as heating network The return water temperature is low, which can create conditions for utilizing the exhaust heat of the steam turbine in the power plant, so that the steam turb...

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Problems solved by technology

However, the absorption heat exchange unit is installed in the thermal station of the community. Because the absorption heat exchange unit is expensive, bulky and heavy, no matter it is placed in the underground computer room of the community in the urban area; the thermal power station is located in the urban area, every inch of land is expensive. will substantially increase investment

[0006] Regarding the waste heat utilization of the steam turbine condenser in the power plant, Feng Taihe proposed in his patent application 200410092465.0 the process of using the absorption heat pump to recover the waste heat of the power plant. Relying on the absorption heat pump can only recover part of the waste heat of the condenser, most of the heat is still discharged to the atmosphere and wasted in vain, and the energy utilization rate of the system is not high

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