Low-melting-point binary nitric acid mixed molten salt nanofluid

A technology of mixing molten salt and nanofluid, which is applied in the field of physical heat transfer and energy storage in high-tech, can solve the problems of not being suitable for single use, high energy consumption, high melting point, etc., and achieve simplified initial operation procedures, reduced costs, and improved thermal conductivity Effect

Active Publication Date: 2017-08-11
河北井矿新能源科技有限公司
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Problems solved by technology

However, in practical applications, single-component molten salts are not suitable for single use due to their high melting points, which cause high energy consumption. Mixed molten salts are often used to achieve the purpose of lowering the melting point.

Method used

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  • Low-melting-point binary nitric acid mixed molten salt nanofluid
  • Low-melting-point binary nitric acid mixed molten salt nanofluid
  • Low-melting-point binary nitric acid mixed molten salt nanofluid

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Embodiment 1

[0032] This novel low melting point binary nitric acid mixed molten salt nanofluid is composed of 99wt% low melting point binary molten salt and 1wt% SiO 2 Nanoparticle composition, wherein the low melting point binary molten salt is composed of 53wt% potassium nitrate and 47wt% calcium nitrate, SiO 2The particle size of the nanoparticles is 20nm. DSC (differential scanning calorimetry) was used to test and analyze the melting point of the new low-cost, low-melting molten salt nanofluid, its decomposition temperature was analyzed by TG (thermogravimetry), and its specific heat was analyzed by DIN51007 standard method. The results show that its melting point is 127.4°C and its decomposition temperature is 574.2°C. The specific heat of the low melting point molten salt nanofluid in liquid state is about 1.73-1.91J / (g·K), and its sensible heat storage cost is about 23.23 yuan / (kW h), its average thermal conductivity is about 0.664W / (m K), and its density is 1.834~2.047g / cm 3 C...

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Abstract

The invention belongs to the technical field of physical heat transmission and energy storage in high and new technologies and relates to low-melting-point binary nitric acid mixed molten salt nanofluid. The low-melting-point binary nitric acid mixed molten salt nanofluid is made by compounding of a low-cost low-melting-point mixed molten salt and nano particles, the low-cost low-melting-point mixed molten salt is mainly composed of potassium nitrate and calcium nitrate, and types of the nano particles are one or two types of SiO2, Al2O3, TiO2 and MgO nanoparticles. The prepared novel low-melting-point binary nitric acid mixed molten salt nanofluid has a melting temperature of 127.4 DEG C, a decomposition temperature of 574.2 DEG C, a specific heat of about 1.73-1.91J/(g.K), a sensible heat storage cost of about 23.23yuan/(kW.h) and a heat conductivity coefficient of about 0.664W/(m.K). Compared with a low-melting-point binary mixed molten salt, the low-melting-point binary nitric acid mixed molten salt nanofluid has the advantage that the utilization temperature range is not changed sharply but specific heat is evidently increased by an increase ratio of about 17.8%.

Description

technical field [0001] The invention relates to a formula of mixed molten salt used for medium-high temperature heat transfer and heat storage, and belongs to the technical field of high-tech physical heat transfer and energy storage. Background technique [0002] Energy is the material basis for human survival and social development, and the most important factor for economic development and prosperity. Today, with the world's rapid increase in energy consumption, rapid consumption of fossil resources, and increasingly severe environmental problems, it is imperative to develop energy-saving and clean energy technologies. [0003] Due to the intermittent and unstable supply of large-scale renewable energy, there are often differences in quantity, form, and space between the supply and demand of energy, which cannot meet the requirements of industrialized large-scale continuous functions. As an important part of energy utilization, energy storage plays a particularly importa...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 吴玉庭李英马重芳
Owner 河北井矿新能源科技有限公司
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