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A method for reducing the corrosion performance of solar power generation heat storage molten salt

A technology of molten salt corrosion and solar energy, applied in the direction of solar thermal power generation, solar thermal devices, heating devices, etc., can solve the anti-corrosion problems of large-sized and complex-shaped equipment, reduce the corrosion of molten salt for solar power generation heat storage, and prepare equipment Problems such as limited size, to achieve good promotion value, low production cost, and less addition

Inactive Publication Date: 2015-08-05
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limited technical level and the size of preparation equipment, high-temperature coating cannot solve the anti-corrosion problem of large-scale and complex-shaped equipment, and cannot be applied to actual production
In addition, the method of adding alloy elements to the metal matrix or preparing a high-temperature coating on the metal matrix to improve the corrosion resistance of the metal is relatively expensive and the process is complicated
[0006] Up to now, there is no report about adding diyttrium trioxide to the molten salt for solar thermal power generation heat storage to reduce the corrosivity of the molten salt for solar power generation heat storage.

Method used

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  • A method for reducing the corrosion performance of solar power generation heat storage molten salt
  • A method for reducing the corrosion performance of solar power generation heat storage molten salt
  • A method for reducing the corrosion performance of solar power generation heat storage molten salt

Examples

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Embodiment 1

[0031] The method for reducing the corrosiveness of solar power generation molten salt in this embodiment is: adding diyttrium trioxide to solar power generation molten salt (the molten salt is a binary carbonate, specifically 62wt%Li 2 CO 3 +38wt%K 2 CO 3 ), and stir evenly, wherein the ratio of the added amount of diyttrium trioxide to the mass of solar power heat storage molten salt is 1:1200, and the average particle size of said diyttrium trioxide is 120nm.

[0032] Put the molten salt with diyttrium trioxide added and the molten salt without diyttrium trioxide in this example into a box-type resistance furnace and heat to 650°C, and then put Inconel625 superalloy samples in both sets of molten salts to 650°C, and then take out the samples after the holding time reaches 5h, 10h, 15h, 20h, 30h, 40h, 50h, 60h, 70h, 80h, 90h and 100h, clean and dry, use ACCULAB ALC-210.4 Type electronic balance weighing. Thus obtain the corrosion weight gain contrast curve of Inconel625 ...

Embodiment 2

[0038] The method for reducing the corrosiveness of solar power generation heat storage molten salt in this embodiment is: adding diyttrium trioxide to solar power generation heat storage molten salt (the molten salt is ternary carbonate, specifically 43.5mol%Li 2 CO 3 +31.5mol%Na 2 CO 3 +25mol%K 2 CO 3 ), and stir evenly, wherein the ratio of the added amount of triyttrium trioxide to the mass of solar power heat storage molten salt is 1:2000, and the average particle size of said diyttrium trioxide is 140nm.

Embodiment 3

[0041] The method for reducing the corrosiveness of solar power generation molten salt in this embodiment is: adding diyttrium trioxide to solar power generation molten salt (Hitec molten salt, specifically 7wt%NaNO 3 +53wt%KNO 3 +40wt%NaNO 2 ), and stir evenly, wherein the ratio of the added amount of diyttrium trioxide to the mass of solar power heat storage molten salt is 1:1000, and the average particle size of said diyttrium trioxide is 150nm.

[0042] The molten salt with diyttrium trioxide added and the molten salt without diyttrium trioxide in this example were put into a box-type resistance furnace and heated to 650 ° C, and then 316S stainless steel samples were placed in both groups of molten salts to 650°C, after the holding time reaches 5h, 10h, 15h, 20h, 30h, 40h, 50h, 60h, 70h, 80h, 90h and 100h, take out the sample, clean and dry, use ACCULAB ALC-210.4 Electronic balance weighing. Obtain 316S stainless steel thus in the molten salt that has added diyttrium t...

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Abstract

The invention provides a method for reducing corrosion property of solar power generation heat-storing fused salt. The method comprises a step of adding yttria into the solar power generation heat-storing fused salt and uniformly mixing, wherein the ratio of addition of the yttria to mass of the solar power generation heat-storing fused salt is 1:(1000-2000). According to the method provided by the invention, the corrosion rate of the equipment, such as a heat reservoir, a heat exchanger and a fused salt pump, in contact with the heat-storing fused salt is obviously reduced, the service life of the equipment, such as the heat reservoir, the heat exchanger and the fused salt pump, is prolonged, and the stability of a solar power generation system is increased. The method is simple and practicable, the production cost is low, the technique is easy to control and the effect is obvious.

Description

technical field [0001] The invention belongs to the technical field of solar thermal power generation, and in particular relates to a method for reducing the corrosion performance of molten salt for heat storage of solar thermal power generation. Background technique [0002] At present, solar thermal power generation is an important project in the utilization of solar energy. It is most likely to generate a large amount of electric energy that can compete with fossil fuels like wind power and hydropower. It is considered to be the most promising power generation method in renewable energy power generation. . Solar thermal power generation technology has attracted the attention of many countries in the world. Solar thermal power generation has important strategic significance for alleviating the situation of energy shortage and environmental deterioration in the world, especially in my country. [0003] There are three types of solar thermal power generation systems: troug...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24J2/34C09K5/06
CPCY02E10/40Y02P20/129
Inventor 王志华朱明王明静
Owner XIAN UNIV OF SCI & TECH
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