Nitrate molten salt heat transferring and reserving medium and preparation method and application thereof

A heat storage medium and molten salt technology, applied in the field of nitric acid molten salt heat transfer heat storage medium and its preparation, heat transfer and heat storage medium field, can solve the problem of increased corrosiveness, high environmental atmosphere requirements, and increased corrosiveness of molten salt. and cost, to achieve the effect of good thermal stability and wide operating temperature range

Inactive Publication Date: 2012-07-04
SUN YAT SEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the melting point of the ternary nitrate system is relatively low, the upper limit use temperature is also low
[0006] In order to solve the above problems, Chinese patent application 00111406.9 discloses a kind of L i NO 3 -KNO 3 -N a NO 3 -N a NO 2 system, its working temperature range is 250°C to 550°C, the upper limit working temperature of this system is higher than the ternary nitrate system, reaching 550°C, but its lower limit working temperature is also increased, and because L i NO 3 The addition of it increases its corrosiveness and costs
[0007] Chinese patent application 200110027954.1 discloses a nitrate system, which has the same melting point as ternary nitric acid molten salt, with an upper limit working temperature of 550°C, but NaNO i...

Method used

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  • Nitrate molten salt heat transferring and reserving medium and preparation method and application thereof
  • Nitrate molten salt heat transferring and reserving medium and preparation method and application thereof
  • Nitrate molten salt heat transferring and reserving medium and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A method for preparing a nitric acid molten salt heat transfer heat storage medium, comprising the following steps:

[0037] Mix 33.4% potassium nitrate, 11.44% sodium nitrate, and 55.16% calcium nitrate and stir evenly, heat statically (without stirring) until the solids are completely melted, then keep warm for 10 minutes, and then cool naturally to 20°C to obtain molten nitric acid Salt heat transfer and heat storage medium; the percentages mentioned are the percentages of each component in the total mass of raw materials of the nitric acid molten salt heat transfer and heat storage medium.

[0038] The melting point test was carried out on the heat transfer and heat storage medium of the nitric acid molten salt prepared in this embodiment. The test is carried out with a common differential scanner (DSC). The DSC curve obtained from the test is as follows figure 1 shown. The test results showed that the melting point of the molten salt was 118.12°C.

Embodiment 2

[0040] A method for preparing a nitric acid molten salt heat transfer heat storage medium, comprising the following steps:

[0041] Mix and stir 29.97% potassium nitrate, 20.53% sodium nitrate, and 49.5% calcium nitrate evenly, statically heat until the solids are completely melted, then keep warm for 20 minutes, and then cool naturally to 25°C to obtain the molten salt heat transfer storage Heat medium; the percentages mentioned are the percentages of each component in the total mass of the raw materials of the nitric acid molten salt heat transfer heat storage medium.

[0042] The melting point of the nitrate molten salt heat transfer and heat storage medium prepared in this embodiment was tested. Test method is the same as embodiment 1. The results showed that the melting point of the molten salt was increased from 118.12°C to 173.23°C compared with Example 1.

Embodiment 3

[0044] A method for preparing a nitric acid molten salt heat transfer heat storage medium, comprising the following steps:

[0045] Mix 22.79% of potassium nitrate, 11.89% of sodium nitrate, and 65.32% of calcium nitrate and stir evenly, statically heat until the solids are completely melted, then keep warm for 30 minutes, and then naturally cool to 30°C to obtain the molten salt heat transfer storage Heat medium; the stated percentages are the percentages of each component in the total mass of the raw materials of the nitric acid molten salt heat transfer heat storage medium.

[0046] The melting point of the nitrate molten salt heat transfer and heat storage medium prepared in this embodiment was tested. Test method is the same as embodiment 1. The test results show that the melting point of the molten salt is 130.78°C, which is lower than that of Example 2.

[0047] The thermal stability of the molten salt medium prepared in Example 1 was tested: firstly, the molten salt sa...

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Abstract

The invention discloses a nitrate molten salt heat transferring and reserving medium and a preparation method and application thereof. The nitrate molten salt heat transferring and reserving medium is prepared with 5 to 40 percent of potassium nitrate, 5 to 25 percent of sodium nitrate, and 10 to 70 percent of calcium nitrate. The melting point of the nitrate molten salt heat transferring and reserving medium can be as low as 120 DEG C, and the upper limit of temperature for use can reach 550 DEG C, the nitrate molten salt heat transferring and reserving medium has a wide temperature scope of application, can work normally at the temperature scope of 180 DEG C to 550 DEG C, and has good thermal stability; the shortcoming of high melting point of binary nitrate molten salt system can be overcome, and the problem of instability caused by easy oxidative decomposition at high temperature of NaNO2 in the Chinese patent 200110027954.1 and ternary nitrate salt system can be solved, and the problems of corrosion and cost increase caused by the existing LiNO3 in the Chinese patent 00111406.9 and the American patent US007588694B1 can also be solved.

Description

technical field [0001] The invention belongs to the field of industrial energy storage and solar high-temperature heat utilization, and specifically relates to a heat transfer and heat storage medium, in particular to a nitric acid molten salt heat transfer and heat storage medium and its preparation method and application. Background technique [0002] Energy storage technology has a wide range of applications in industrial energy conservation and renewable energy utilization. However, the efficiency of energy utilization in my country's large-scale industrial fields is low, and renewable energy has the disadvantages of intermittent and non-continuous energy supply. storage and transportation issues. [0003] In industrial energy storage and solar high-temperature heat utilization technologies, the heat transfer and heat storage media currently used mainly include air, water / steam, hydrated salts, paraffins, fatty acids, and molten salts. Among them, molten salt as a heat ...

Claims

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Application Information

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IPC IPC(8): C09K5/12
Inventor 丁静彭强魏小兰黄晓斐陆建峰杨建平杨晓西
Owner SUN YAT SEN UNIV
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