Phase change heat accumulation system for generating steam directly and preparation method of phase change heat accumulation agent

A technology of phase change heat storage and steam, which is applied in the direction of steam generation method using heat carrier, heat storage equipment, indirect heat exchanger, etc., to achieve the effects of high heat transfer efficiency, improved efficiency and low cost

Inactive Publication Date: 2012-11-14
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, expanded graphite is an anisotropic material, resulting in a great relationship between the effective thermal conductivity value and the measurement direction
And the composite phase change material has cracking and salt seepage after multiple heat storage and release cycles.
[0005] To sum up, the current high temperature phase change heat storage in concentrating solar thermal power generation system and industrial waste heat recovery has unstable performance, low thermal efficiency, Disadvantages such as higher cost

Method used

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  • Phase change heat accumulation system for generating steam directly and preparation method of phase change heat accumulation agent
  • Phase change heat accumulation system for generating steam directly and preparation method of phase change heat accumulation agent
  • Phase change heat accumulation system for generating steam directly and preparation method of phase change heat accumulation agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Such as figure 1 As shown, a phase change heat storage system that directly generates steam includes a heat storage tank 1, a heat exchange tube 3 and a phase change heat storage agent 2. The heat exchange tube 3 passes through the heat storage tank 1 vertically, and the heat exchange tube 3 The upper end of the upper end is connected with the upper head 4, and the lower end of the heat exchange tube 3 is connected with the lower head 22. The upper end 4 and the lower head 22 are both oval heads. Between the heat exchange tubes 3, between the heat exchange tubes 3 and the The inner wall of the heat storage tank 1 is filled with a phase-change heat storage agent 2, the upper head 4 is connected to the heat source 11 through the first pipeline 6, the first pipeline 6 is provided with a first steam valve 5, and the upper head 4 passes through the second pipeline 8 Connect the gas-liquid separator 9, the second pipeline 8 is provided with a second steam valve 7, the gas ou...

Embodiment 2

[0064] Such as figure 2 , 3, repeating Example 1, there are the following differences: the upper head 4 and the lower head 22 are rectangular heads, and the binary eutectic salt adopts KNO3-LiNO3 with a melting point of 270°C. The phase change heat storage agent 2 is a composite phase change heat storage agent 2 of KNO3-LiNO3 and graphite foam, the graphite foam has a porosity of 0.84 and a pore diameter of 300 mm.

[0065] The preparation method of the composite phase change heat storage agent 2 of KNO3-LiNO3 and graphite foam comprises the following process steps:

[0066] 1. Determine the mass fraction of the two components of the binary eutectic salt

[0067] The mass fraction of KNO3 required to prepare KNO3-LiNO3 at 270°C is 85%, and the mass fraction of LiNO3 is 15%;

[0068] 2. Preparation:

[0069] Prepare KNO3 and LiNO3 according to the ratio of KNO3 mass fraction 85%, LiNO3 mass fraction 15%,

[0070] Prepare a graphite foam with a pore size of 300 mm and a por...

Embodiment 3

[0081] Such as Figure 4 As shown, repeating Example 1, there are the following differences: In this embodiment, two heat storage tanks 1 connected in series are used, and the series operation of heat storage tanks 1 can significantly improve the heat storage and release performance of the system, and more effectively carry out heat storage.

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Abstract

The invention relates to a phase change heat accumulation system for generating steam directly and a preparation method of a phase change heat accumulation agent. A phase change material is enhanced with graphite foam, and is absorbed in a porous medium of the graphite foam, so that a binary eutectic salt / graphite foam material is prepared and is used as a composite phase change material of a heat accumulation device, the composite phase change material is high in heat conduction coefficient, therefore under the same design condition, the phase change heat accumulation system provided by the invention is applied to systems of a focusing type solar thermal power generation system, an industrial waste heat recovery system and the like, and has the characteristics of high heat transfer efficiency, small volume, low cost and the like. In addition, the phase change heat accumulation system for generating steam directly can flexibly adopt a parallel connection or serial connection mode according to the temperature of high-temperature waste heat steam and the requirement of a steam user; and during serial connection, the binary eutectic salt / graphite foam composite phase change material can be combined in a cascaded manner according to a melting point, thus the efficiency of an energy accumulation system is increased, and the energy can be greatly accumulated.

Description

Technical field: [0001] The invention belongs to the technical field of heat storage devices, and in particular relates to a phase-change heat storage system for directly generating steam using a high-temperature composite eutectic salt as a heat storage material and a preparation method for a phase-change heat storage agent. Background technique: [0002] Concentrating solar thermal power generation (CSP), as a new technology with great potential for developing new energy and renewable energy, has made significant progress and breakthroughs in Europe and the United States, and has become the most promising power generation method besides wind energy. CSP refers to a technology that gathers sunlight and converts it into high-temperature thermal energy of a working fluid, and then converts it into electrical energy through a heat engine. Since the solar energy supply is unstable and discontinuous, and the thermal power generation system needs to operate stably, in addition ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22B1/02F28D20/02C09K5/06
CPCY02E60/145Y02E60/14Y02P20/10
Inventor 郭茶秀王定标曹海亮魏新利董贺新刘树兰
Owner ZHENGZHOU UNIV
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