Heat capacity heat exchange device

Abstract

The invention provides a heat capacity heat exchange device which is composed of a first shell, a second shell, heat exchange media and heat capacity media. The first shell and the second shell are internally and externally arranged, the heat capacity media are filled in the full or partial space between the first shell and the second shell, the external energy is transmitted to the heat exchange media through the heat capacity media, and heat collection of the heat exchange device is completed. The heat capacity heat exchange device has the wide use range, can be applied to the solar energy utilized field of a groove type photo-heat heat collector or a fresnel array photo-heat heat collector or a disc type photo-heat heat collector or a tower type photo-heat heat collector, is particularly applied to a direct steam generation, conduction oil and melting salt system, can also be applied to boiler heating and the application field of the heat input and the heat output of a heat storage system, and well solves the technical problem which is hard to solve by a plurality of conventional technologies in the corresponding application field.

Description

Technical field [0001] The invention relates to a heat capacity heat exchange device applied in the field of solar thermal utilization. Background technique [0002] As the use of renewable energy such as solar energy is booming all over the world, concentrated solar power generation (CSP) has gradually become known to people. In the CSP system, the heat absorption and heat transfer part has a very important position. The heat exchange medium in the solar heat collection system currently mainly uses heat transfer oil as the heat transfer medium, and steam is generated after the heat transfer oil-steam heat exchanger to drive the conventional steam turbine to drive the generator set to generate electricity. Since the current working temperature of the heat transfer oil must be controlled within 400°C, exceeding this temperature will cause problems such as cracking of the heat transfer oil, increased viscosity, and reduced heat transfer efficiency; the current international solar h...

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Problems solved by technology

[0003] The direct steam generation (DSG) technology, which uses water directly as the heat exchange medium, has been tested for many years. This technology is similar to the operating principle of the heating pipe of the steam boiler. Water is used as the working medium, and low-temperature water is injected from one end of the heat-absorbing pipe, and the water flows along the pipe. During the traveling of the road axis, the heat is absorbed gradually and the temperature rises gradually. After reaching the boiling point, it becomes saturated steam, and then continues to absorb heat and becomes superheated steam. The phase transition process is the most complicated. flow pattern, aeroelastic flow pattern, wavy stratified flow pattern, and annular flow pattern; in the wavy stratified process and region, liquid water and saturated gas contact alternately with the pipe wall, resulting in a rapid periodic rise in pipe wall temperature and The decline will have a great impact on the material structure strength of the entire collector, and even damage it; in the annular flow process and area, the upper part of the tube is in direct contact with steam, while the bottom is in direct contact with liquid water, making the process and area The temperature difference between the upper and lower parts of the pipe is large, causing serious warping and shortening the service life of the collector pipe; or when the steam is generated inside the collector, the cloud moves, causing the state of the water to boil in the heating pipe to be unstable. Problems such as phase flow transmission and vaporization pressure in the heat collecting tube are not uniform, such as water hammer, vibration, and fatigue damage of pipeline materials; , serious bending will occur, causing other losses (such as vacuum seal damage); moreover, the existing technology still has not solved the local non-heating of the DSG pipeline (such as local shadows caused by cloud occlusion in the mirror field), which brings a series of Problems, such as water input and steam output flow control, the effect of parameter changes

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