Large temperature difference heat exchange method and large temperature difference heat exchange device capable of reducing return water temperature of heat supply network

Abstract

The invention provides a large temperature difference heat exchange method and a large temperature difference heat exchange device capable of reducing the return water temperature of a heat supply network to increase a heating load of the heat supply network. The large temperature difference heat exchange method and the large temperature difference heat exchange device are specially provided for a newly-built or rebuilt old heat supply network to solve the problem that the heating load of the old heat supply network is generally not sufficient. The large temperature difference heat exchange method comprises the following steps: incoming water of the heat supply network enters a high temperature heat exchanger and heats high pressure freon, produced high pressure freon vapor injects low pressure freon vapor in an evaporator through an ejector, freon vapor ejected by the ejector heats heating circulating water, the incoming water of the heat supply network flows out of the high temperature heat exchanger, then enters a middle temperature heat exchanger, heats the heating circulating water and then flows into a low temperature heat exchanger, the incoming water of the heat supply network releases heat to low temperature liquid freon, left after evaporation, from the evaporator, and the incoming water of the heat supply network releases heat for cooling for three times and then returns to a return water pipeline of the heat supply network. The large temperature difference heat exchange device comprises the high temperature heat exchanger, the middle temperature heat exchanger, the low temperature heat exchanger, the evaporator, a condenser, the ejector and three freon pumps.

Description

technical field [0001] The invention relates to thermal technology, in particular to a large temperature difference heat exchange method and device for reducing the return water temperature of a heating network. Background technique [0002] In recent years, with the continuous development of my country's urban construction, the contradiction between regional development and heating demand has become increasingly prominent. The urban area of ​​all cities is constantly expanding, the large-scale residential areas in the main urban area are constantly increasing, the area of ​​the old urban area is greatly increased every year, and the area of ​​the new urban area is also expanding. Judging from the current heat source and heating network heating capacity of the city, it is far from meeting the needs of the city's rapid development. If the heat supply cannot keep up, it will cause a bottleneck in urban development. [0003] In order to solve this contradiction concerning urb...

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Problems solved by technology

[0013] Aiming at newly building or renovating the old heating pipe network and solving the problem of insufficient heat supply generally existing in the heating pipe network, the present invention provides a method that can...

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