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

A heat storage medium and quartz sand technology, applied in chemical instruments and methods, heat exchange materials, energy input, etc., can solve the problem of low upper limit temperature of ternary nitric acid molten salt, and achieve improved thermal stability and upper limit The effect of using temperature, high energy utilization rate and high energy storage density

Active Publication Date: 2014-07-09
QINGHAI ENESOON NEW MATERIAL TECH & SCI CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a kind of quartz sand composite ternary nitric acid molten salt heat transfer heat storage medium and preparation method, to improve the use of ternary nitric acid molten salt with low upper limit temperature

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1~4

[0032] Embodiment 1~4. Ternary nitrate system KNO 3 -NaNO 3 -NaNO 2 Preparation of heat storage and heat transfer medium by adding quartz sand

[0033] Step 1. Prepare the materials that form the ternary nitric acid molten salt system according to the formula listed in Table 1, put it into the reaction kettle, heat and stir to melt the solid completely, then keep the temperature for 0.5-1h, and the heating temperature is 50 °C above the molten salt phase transition temperature. -100℃.

[0034] Step 2. Under stirring conditions, disperse the quartz sand into the molten ternary nitric acid molten salt system, continue stirring for 1-2 hours, and the mixture is gelatinous.

[0035] Step 3. Cool and pack.

[0036] The added quartz sand (specification is 100 mesh) is carried out in a gradient as follows:

[0037] The first group: quartz sand accounts for 1% of the four kinds of quartz sand composite ternary nitric acid molten salt heat transfer and heat storage medium, and the...

Embodiment 5~7 3

[0055] Embodiment 5~7 ternary nitrate system KNO 3 -NaNO 3 -Ca (NO 3 ) by adding quartz sand to prepare heat storage and heat transfer medium

[0056] The quartz sand composite ternary nitric acid molten salt is prepared according to the formula listed in Table 1, and the method is the same as that of the steps 1 of Examples 1 to 4.

[0057] The addition of quartz sand proceeds in a gradient:

[0058] The first group: quartz sand accounts for 1% of the three kinds of quartz sand composite ternary nitric acid molten salt heat transfer and heat storage medium, and the 17th to 19th products are obtained.

[0059] The second group: quartz sand accounts for 30% of the four kinds of quartz sand composite ternary nitric acid molten salt heat transfer and heat storage medium, and the 20th to 22nd products are obtained.

[0060] The third group: quartz sand accounts for 50% of the four kinds of quartz sand composite ternary nitric acid molten salt heat transfer and heat storage med...

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Abstract

The invention discloses a heat-transfer heat-accumulation medium prepared by combining quartz sand and a ternary molten nitrate salt and a preparation method thereof, and belongs to the field of solar energy photo-thermal electricity generation. The heat-transfer heat-accumulation medium is composed of a ternary molten nitrate salt system and quartz sand. The invention also provides a preparation method of the heat-transfer heat-accumulation medium. The heat-transfer heat-accumulation medium basically does not change the freezing point of the ternary molten nitrate salt, also the upper limit operating temperature of the ternary molten nitrate salt is improved and is up to 750 DEG C. The heat-transfer heat-accumulation medium is good in thermal stability, high in thermal conductivity, low in cost and extremely suitable for solar energy thermal power electricity generation systems and solar energy photo-thermal electricity-generation heat-accumulation heat-transfer systems.

Description

technical field [0001] The invention relates to a heat storage and heat transfer composite medium for solar photothermal power generation, in particular to a quartz sand composite ternary nitric acid molten salt heat transfer and heat storage medium and a preparation method thereof. Background technique [0002] In industrial energy storage and solar thermal power generation technology, the main heat storage and heat transfer media currently used are air, water, heat transfer oil, molten salt, sodium and aluminum metals. Due to its wide operating temperature range, low vapor pressure, low viscosity, good stability, low cost and many other characteristics, molten salt has become a potential heat transfer and heat storage medium in solar thermal power generation technology, and has become more widely used at present. A more mature heat transfer and heat storage medium. [0003] The outstanding advantages of nitric acid molten salt system are the wide source of raw materials, ...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCY02P20/129
Inventor 曾智勇
Owner QINGHAI ENESOON NEW MATERIAL TECH & SCI CO LTD
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