Heat-transfer heat-accumulation medium prepared by combining quartz sand and multi-composition molten nitrate salt and preparation method

A heat storage medium, quartz sand technology, applied in chemical instruments and methods, heat exchange materials, energy input, etc., can solve the problems of increased corrosion, increased maintenance costs, no quartz sand, etc., to achieve high Fire resistance, low industrial cost, improved thermal stability and the effect of upper limit use temperature

Active Publication Date: 2014-07-16
QINGHAI ENESOON NEW MATERIAL TECH & SCI CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] Chinese patent application 00111406.9 discloses a LiNO 3 -KNO 3 -NaNO 3 -NaNO 2 The working temperature range of the multi-component nitrate molten salt system is 250°C-550°C. The upper limit working temperature of this system is higher than that of the ternary nitrate system, reaching 550°C, but the lower limit working temperature is also raised,

Method used

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  • Heat-transfer heat-accumulation medium prepared by combining quartz sand and multi-composition molten nitrate salt and preparation method
  • Heat-transfer heat-accumulation medium prepared by combining quartz sand and multi-composition molten nitrate salt and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1~3

[0043] Embodiment 1~3. Multivariate nitrate system KNO 3 -NaNO 3 -NaNO 2 -CsNO 3 Adding quartz sand to prepare heat storage and heat transfer medium

[0044] Step 1. Preparation of quartz sand composite multi-element nitric acid molten salt products 1~3:

[0045] The formula listed in table 1 is prepared to form the material of multi-component nitric acid molten salt system, after heating and stirring evenly, add quartz sand, continue heating and stirring, to degas and dewater, heating temperature is 80-120 ℃ above the molten salt phase transition temperature.

[0046] Disperse quartz sand (100 mesh) into the molten multi-component nitric acid molten salt system, and stir the molten mixture for 1-2 hours to obtain a quartz sand composite multi-component nitric acid molten salt heat transfer and heat storage medium. Quartz sand accounts for 1%, 20%, and 50% of products 1~3 respectively.

[0047] Step 2. Thermal stability test of products 1~3

[0048] The thermal stability t...

Embodiment 4~6

[0058] Embodiment 4~6 multi-component nitrate system KNO 3 -NaNO 3 -NaNO 2 -Ca(NO 3 ) 2 Adding quartz sand to prepare heat storage and heat transfer medium

[0059] According to the formula listed in Table 1, prepare the materials to form the multi-component nitric acid molten salt system.

[0060] The preparation method and detection method of product 4~6 are completely the same as embodiment 1~3, and quartz sand (100 orders) accounts for 10%, 25%, 40% respectively; The contrast does not contain quartz sand, is embodiment 4~6 in table 1 corresponding system.

[0061] Thermal stability measurement result is similar to embodiment 1~3, after being incubated at 700 DEG C for 30 hours, the loss rate of three kinds of products prepared by the present invention is successively about 10%, 3%, 1%, obviously lower than contrast Up to 28%.

[0062] It is carried out with a common differential scanner DSC (scanning is performed under normal pressure). The test results show that, ...

Embodiment 7~9

[0063] Embodiment 7~9. Multivariate nitrate system KNO 3 -NaNO 3 -NaNO 2 -LiNO 3 Adding quartz sand to prepare heat storage and heat transfer medium

[0064] The formula listed in table 1 is prepared to form the material of multivariate nitric acid molten salt system

[0065] Preparation method and detection method are completely the same as embodiment 1~3.

[0066] The quartz sand (100 order) that embodiment 7~9 adds accounts for 15%, 30%, 45%

[0067] Thermal stability measurement result is similar to embodiment 1 ~ 3, after being incubated at 700 DEG C for 30 hours, the loss rate of three kinds of products prepared by the present invention is the highest 12%, 4%, 2%, obviously lower than the 30% of contrast. %.

[0068] It is carried out with a common differential scanner DSC (scanning is performed under normal pressure). The test results show that, compared with the control, the melting points of products 7-9 are basically unchanged, and the latent heat of phase cha...

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Abstract

The invention relates to a heat-transfer heat-accumulation medium prepared by combining quartz sand and a multi-composition molten nitrate salt and a preparation method, and belongs to the field of solar photo-thermal power generation. The heat-transfer heat-accumulation medium is composed of a multi-composition molten nitrate salt system and quartz sand. The invention also provides the preparation method of the heat-transfer heat-accumulation medium. The heat-transfer heat-accumulation medium disclosed by the invention keeps the low melting point of the multi-composition molten nitrate salt, and also helps to improve the upper limit operating temperature of the multi-composition molten nitrate salt, and the upper limit operating temperature is up to 700 DEG C. The heat-transfer medium is low in cost, wide in operating temperature range, good in heat stability and high in thermal conductivity, and is extremely suitable for a solar thermal power generation system and a heat-accumulation heat-transfer system based on solar photo-thermal power generation.

Description

technical field [0001] The invention relates to a heat storage and heat transfer composite medium for solar thermal power generation, in particular to a quartz sand composite multi-element nitric acid molten salt heat transfer and heat storage medium and a preparation method. Background technique [0002] In industrial energy storage and solar thermal power generation technologies, the heat storage and heat transfer media currently used mainly include air, water, heat transfer oil, molten salt, sodium and aluminum and other metals. Molten salt has become a potential heat transfer and heat storage medium in solar thermal power generation technology due to its wide operating temperature range, low vapor pressure, low viscosity, good stability, and low cost. A relatively mature heat transfer and heat storage medium. High-temperature molten salts mainly include nitrates, carbonates, sulfates, fluorides, chlorides, oxides, etc. [0003] Nitric acid molten salt system has a wide...

Claims

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Application Information

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IPC IPC(8): C09K5/12
CPCY02P20/129
Inventor 曾智勇
Owner QINGHAI ENESOON NEW MATERIAL TECH & SCI CO LTD
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