Phase change heat exchange device

Abstract

A phase-change heat-exchanging apparatus (1) comprising an inner tube (2), an outer tube (3), and a heat-exchanging medium (4). The inner tube (2) is arranged within the outer tube (3). Medium passages (7) are arranged on the tube wall of the inner tube (2). In a liquid state, the heat-exchanging medium (4) flows from an end of the inner tube (2) through the entire inner tube (2), at the same time, enters the space between the inner tube (2) and the outer tube (3) by passing through the medium passages (7) on the tube wall of the inner tube (2), and receives a heat source acquired by the wall of the outer tube (3). The heat-exchanging medium (4), when phase-changed into vapor, is transferred from an end of the outer tube (3) to the exterior of the phase-change heat-exchanging apparatus (1). The phase-change heat-exchanging apparatus (1) is capable of acquiring relatively uniform two-phase flow exchange on the axial direction of the entire phase-change heat-exchanging apparatus (1), thus solving the problems of water hammer, vibration, and pipeline fatigue damage due to non-uniform axes of two-phase flow exchange and of vaporization pressure which are in turn caused by conventional heat-exchanging medium flowing on the axis, warming gradually when changing phases.

Description

technical field [0001] The invention relates to a heat exchange device. Background technique [0002] With the vigorous development of renewable energy such as solar energy in the world, concentrated solar power (CSP) is gradually recognized by people. In the CSP system, the heat absorption and heat transfer part plays a very important role. The heat exchange medium of solar heat collector tube technology currently mainly uses heat transfer oil as the heat transfer medium, and after heat transfer through the heat transfer oil, it drives a conventional steam turbine to drive a generator set to generate electricity. Since the current working temperature of heat transfer oil must be controlled within 400°C, exceeding this temperature will lead to problems such as heat transfer oil cracking, increased viscosity, and reduced heat transfer efficiency, which limits the working temperature of solar thermal power generation. At the same time, the cost of using heat transfer oil is v...

AI Technical Summary

Problems solved by technology

Due to the unstable state of water when boiling in the heating tube, there are problems such as two-phase flow transmission and uneven vaporization pressure in the heat collecting tube, such as water hammer, vibration, and fatigue damage of pipeline materials; in addition, when saturated steam becomes superheated In the steam section, due to the poor thermal conductivity and weak heat absorption capacity of steam, the pipeline is prone to overheating damage, and when the pipeline is heated unevenly, it will be severely bent, causing other losses (such as vacuum seal damage)

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