Large-temperature-difference heat exchange device

Abstract

The invention provides a large-temperature-difference heat exchange device. After hot-net high-temperature hot water enters a high-temperature evaporator and releases heat to become medium-temperaturehot water, the hot-net high-temperature hot water enters a low-temperature evaporator and continuously releases the heat to become low-temperature hot water, and the low-temperature hot water returnsto a hot-net water return pipeline; the high-temperature hot water in the high-temperature evaporator flows outside a heat exchange tube from top to bottom, and the heat medium water in the heat exchange tube is evaporated to generate steam; the low-temperature hot water in the low-temperature evaporator horizontally flows and releases heat in the heat exchange tube, the heat medium water outsidethe heat exchange tube is heated and evaporated to generate steam; and a steam ejector is arranged, steam is generated by the high-temperature evaporator to serve as driving steam, steam generated bythe low-temperature evaporator serves as suction steam, and steam sprayed out of the outlet of the steam ejector enters the condenser. The condensed water generated by the condenser enters the low-temperature evaporator through a throttling valve, and the other part of the condensed water enters the high-temperature evaporator through the water pump; the other side of the condenser is used for heating the heating circulating water; and a vacuum air extracting opening is formed in the lower part of the steam condensation side of the condenser;

Description

technical field [0001] The invention relates to thermal technology, in particular to a 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, central heating proj...

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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. Large temperature difference heat exchange device

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