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Fusion tray of thermal transmission and storage medium, and preparation method

A heat storage medium and molten salt technology, which is applied in the fields of chemical industry and solar energy utilization, can solve the problems of low heat engine efficiency, low solar energy utilization efficiency, and high working temperature in power generation systems, achieve large phase change latent heat, expand the working temperature range, and improve thermal efficiency. The effect of decomposition temperature

Inactive Publication Date: 2007-10-10
SUN YAT SEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two heat transfer and heat storage media have their own shortcomings in application: (1) the boiling point of the binary nitrate system is high, and the corresponding upper limit working temperature is also high, which is ideal; but its melting point is relatively high, and the corresponding lower limit The working temperature is also high, and it needs to consume more energy for heat preservation in practical applications to prevent the condensation of molten salt in the pipeline, and the condensation of molten salt in the pipeline will have very serious consequences for the solar thermal power generation system; Therefore, energy consumption and heat preservation are the disadvantages of the binary nitrate system as a heat transfer and heat storage medium.
(2) The melting point of the ternary nitrate system is low, and the actual lower limit working temperature must be low, which is conducive to reducing the energy consumption of heat preservation; but the boiling point of the ternary nitrate system is also low, which will lead to low heat engine efficiency of the power generation system, Lead to low efficiency of solar energy utilization; therefore, low boiling point is the shortcoming of ternary nitrate system as heat transfer and heat storage medium
Therefore, LiNO 3 -KNO 3 -NaNO 3 -NaNO 2 As a heat transfer and heat storage medium for solar thermal power generation, the system has the disadvantages of high lower limit working temperature and high corrosion

Method used

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  • Fusion tray of thermal transmission and storage medium, and preparation method
  • Fusion tray of thermal transmission and storage medium, and preparation method
  • Fusion tray of thermal transmission and storage medium, and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Mix cesium nitrate and potassium chloride with a mass ratio of 0.1:1 and stir evenly, heat statically until the solids are completely melted, keep the temperature for 10 minutes, and cool naturally to room temperature to obtain the additive.

[0035] The mass percentage is 52.5% potassium nitrate, 6.9% sodium nitrate, 39.6% sodium nitrite, and 1% of the additives are mixed and stirred evenly, statically heated until the solids are completely melted, then kept for 10 minutes, and then naturally cooled to room temperature to obtain the molten salt heat transfer heat storage medium.

[0036] The thermal stability of the prepared molten salt medium was tested. The test is carried out by gravimetric method: in a nickel crucible, add the prepared molten salt, weigh it with an analytical balance, and then statically heat until the solid is completely melted and the temperature of the molten salt reaches 500°C, keep it warm for 5 hours, and cool naturally to room temperature T...

Embodiment 2

[0041] Mix cesium nitrate and potassium chloride with a mass ratio of 0.8:1 and stir evenly, heat statically until the solids are completely melted, keep the temperature for 30 minutes, and cool naturally to room temperature to obtain the additive.

[0042] 40% potassium nitrate, 10% sodium nitrate, 47% sodium nitrite, 3% of the additives were mixed and stirred evenly, statically heated until the solids were completely melted, then kept for 30 minutes, and then naturally cooled to room temperature to obtain the molten salt heat transfer heat storage medium.

[0043] The thermal stability performance of molten salt media was tested. Test method is the same as embodiment 1. The results showed that the thermal stability of the modified molten salt at 550°C increased correspondingly with the addition of additives.

[0044] The melting point and latent heat of phase change of molten salt are tested. Test method is the same as embodiment 1. The test results show that the melting...

Embodiment 3

[0046] Mix cesium nitrate and potassium chloride with a mass ratio of 0.2:1, stir evenly, heat statically until the solids are completely melted, keep the temperature for 15 minutes, and cool naturally to room temperature to obtain the additive.

[0047] 70% potassium nitrate, 6% sodium nitrate, 21% sodium nitrite, 3% of the additives were mixed and stirred evenly, statically heated until the solids were completely melted, then kept for 15 minutes, and then naturally cooled to room temperature to obtain the molten salt heat transfer heat storage medium.

[0048] The thermal stability performance of molten salt media was tested. Test method is the same as embodiment 1. The results showed that the thermal stability of the modified molten salt at 550°C was also enhanced with the increase of additive dosage.

[0049] The melting point and latent heat of phase change of molten salt are tested. Test method is the same as embodiment 1. The test results show that the range of impr...

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Abstract

This invention discloses a method for preparing molten salt heat-transfer and heat-storage medium, which comprises potassium nitrate, sodium nitrate, sodium nitrite and additives. The additives are cesium nitrate and potassium chloride at a weight ratio of (0.1-0.8):1. The molten salt heat-transfer and heat-storage medium has such advantages as good heat transfer property, wide working temperature range, high heat stability, high upper limit of safe usage temperature, low melting point, high phase-change latent heat, low requirement for system size and energy, and high energy utility.

Description

technical field [0001] The invention relates to the fields of chemical industry and solar energy utilization, in particular to a molten salt heat transfer heat storage medium and a preparation method thereof. Background technique [0002] Renewable energy has the disadvantages of intermittent and unstable supply, and cannot meet the requirements of large-scale industrial continuous energy supply. In order to effectively solve the conversion, storage and transportation problems of renewable energy, it is necessary to develop efficient heat transfer and heat storage technology. In solar thermal utilization technology, the heat transfer and heat storage media currently used mainly include: air, mixed oil, water / steam, metals such as sodium and aluminum, and molten salts. Among them, molten salt as a heat transfer medium can reach a higher temperature, and at the same time has the function of heat storage, and can also overcome the problem of unstable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 丁静魏小兰彭强杨晓西杨建平
Owner SUN YAT SEN UNIV
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