Phase change heat exchange device

Abstract

The invention provides a phase change heat exchange device, consisting of tubular bodies and a heat exchange medium, wherein the tubular bodies are arranged insides and outsides; a space between an internal pipe and an external pipe forms a complete or partial liquid phase region; the complete or partial space in the interior of the internal pipe forms a vaporizing region; the relatively high-pressure heat exchange medium in the interior of the liquid phase region is heated during the vortex flowing so as to enter the relatively low-pressure vaporizing region; and after the occurrence of vaporization, the heat exchange medium flows out of the device, so that the heat exchange is completed. The device not only can be applied to a DSG (Direct Steam Generation) system in the optothermal field of solar energy, but also can be applied to the field of an input / output system of a heat storage system or boiler heating; and in addition, the operation is safe, the cost is low and the application range is wide.

Description

[0001] technical field [0002] The invention relates to a heat exchange device applied in multiple fields, in particular to a phase conversion heat exchange device in the field of solar heat utilization. Background technique [0003] 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 collection technology currently mainly uses heat transfer oil as the heat transfer medium, and after heat exchange 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, wh...

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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 the steam, the pipeline is prone to overheating damage; and when the pipeline is heated unevenly, the temperature difference of the pipe wall is large, and severe bending will occur, causing other losses (such as vacuum sealing Destruction); Moreover, the existing technology still does not solve a series of problems caused by the DSG pipeline without local heating (such as local shadows caused by cloud occlusion in the mirror field), such as water input and steam output flow control, and parameter changes. influences

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