Direct-connected large temperature difference heat exchange device

Abstract

The invention provides a direct connection type large-temperature-difference heat exchange device. The direct connection type large-temperature-difference heat exchange device structurally comprises a water return device, a high-temperature evaporator, a low-temperature evaporator, a condenser, an ejector, a plurality of valves, water pumps and some connecting pipelines. The working process comprises the following steps, high-temperature hot water with a certain pressure from a heat supply pipe network enters the high-temperature evaporator through a water return device, flash evaporations are performed stage by stage from top to bottom, and the residual hot water supplies heat to heat users; after supplying the heat, the hot water returns and enters he low-temperature evaporator, flash evaporations are performed stage by stage from top to bottom, and residual hot water flows back to the heat network through the water return device; and the ejector uses flash evaporation steam from the high-temperature evaporator as the driving steam to guide and inject the steam from the low-temperature evaporator, then the mixed steam enters the condenser and heat the sprayed heating returned water, and the heated water supplies heat the heat users. A vacuum air pump is arranged on the side wall of the last stage of the condenser, the non-condensable gas such as air is drawn out, and the vacuum degree of the whole device is maintained; and the water return device is a self-service power device for carrying out hot water circulation, and uses the water pressure from the water from the heat network to do work to push the heat network returned water with insufficient boosting pressure back to the heat network pipeline.

Description

technical field [0001] The invention relates to thermal technology, in particular to a direct-connected large temperature difference heat exchange device. 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 urban development and the vital interests of the people, cen...

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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 reduce the return water temperature of the heating network, thereby increasing the heat supply of the heating pipe network. The direct-connected large temperature difference heat exchange device

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