Nanometer molten binary nitrate heat-transfer heat-storage medium and preparation method thereof

A heat storage medium and molten salt technology, applied in chemical instruments and methods, heating devices, mechanical equipment, etc., can solve problems such as poor thermal stability, low thermal conductivity, narrow operating temperature range, etc., to achieve increased thermal conductivity and increased thermal conductivity coefficient and heat transfer area, the effect of avoiding local overheating

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

[0005] According to the defects and gaps in the above-mentioned fields, the present invention provides a formula of a binary nitric acid nano-molten salt heat transfer and heat storage medium. The preparation process overcomes the low thermal conductivity and thermal stability of the existing binary nitric acid molten salt system. Poor performance, narrow operating temperature range, etc.

Method used

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  • Nanometer molten binary nitrate heat-transfer heat-storage medium and preparation method thereof
  • Nanometer molten binary nitrate heat-transfer heat-storage medium and preparation method thereof
  • Nanometer molten binary nitrate heat-transfer heat-storage medium and preparation method thereof

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Effect test

preparation example Construction

[0069] The preparation method of nitric acid nano molten salt of the present invention has two kinds of options:

[0070] 1. Small-scale production for laboratory research can use the following steps:

[0071] Step 1: Compose a binary nitric acid molten salt system in proportion, put it into a vacuum heating furnace and heat to remove gas and water to make it into a molten state, and heat at a temperature 50-100°C above the phase transition temperature of the molten salt.

[0072] Step 2: Add the nanoparticles in proportion to the molten binary nitric acid nano-molten salt system in step (1), magnetically stir the molten mixture for 0.5-1h, keep it warm and ultrasonic for 0.5-2h, and cool naturally to obtain uniform and stable binary nitric acid nano molten salt.

[0073] 2. Large-scale production preferably adopts the following processes and supporting molten salt preparation equipment:

[0074] Molten salt preparation equipment: the equipment includes a heat source device,...

Embodiment 1

[0089] Example 1. Based on KNO 3 -NaNO 3 Preparation process and performance comparison of nanometer molten salt of binary nitrate system

[0090] Step 1. Composition of KNO in proportion 3 -NaNO 3 The molten salt system is put into a vacuum heating furnace and heated to remove gas and water to make it into a molten state, and the temperature is 50-100°C above the phase transition temperature of the molten salt.

[0091] Step 2. Add the nanoparticles into the melted binary nitric acid nano-molten salt system in step (1) in proportion, stir the molten mixture for 0.5-1h with magnetic force, keep it warm and ultrasonic for 0.5-2h, and cool naturally to obtain a uniform and stable binary nitric acid salt system. Nitric acid nano molten salt.

[0092] Step 3. Melting point test:

[0093] The general differential scanner DSC is used (scanning under normal pressure).

[0094] Step 4. Thermal Stability Test

[0095] The thermal stability test was carried out on the prepared bi...

Embodiment 2

[0113] Example 2 is based on KNO 3 -NaNO 2 Preparation process and performance comparison of nanometer molten salt of binary nitrate system

[0114] Step 1. Composition of KNO in proportion 3 -NaNO 2 For the molten salt system, heat and stir evenly and put it into a vacuum heating furnace to heat and degas and remove water to make it into a molten state. The heating temperature is 50-100°C above the phase transition temperature of the molten salt.

[0115] Step 2. Add the nanoparticles into the melted binary nitric acid nano-molten salt system in step (1) in proportion, stir the molten mixture for 0.5-1h with magnetic force, keep it warm and ultrasonic for 0.5-2h, and cool naturally to obtain a uniform and stable binary nitric acid salt system. Nitric acid nano molten salt.

[0116] Step 3. Melting point test:

[0117] The general differential scanner DSC is used (scanning under normal pressure).

[0118] Step 4. Thermal Stability Test

[0119] The thermal stability tes...

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Abstract

The invention relates to a nanometer molten binary nitrate heat-transfer heat-storage medium and a preparation method thereof and belongs to the field of solar photo-thermal electricity generation. The nanometer molten binary nitrate heat-transfer heat-storage medium is characterized in that nano-particles are dispersed in a KNO3-NaNO3 and KNO3-NaNO2 solid-liquid phase-change molten binary nitrate system at a high temperature so that the nanometer molten binary nitrate heat-transfer heat-storage medium is compounded, and the nano-particles comprise SiO2, ZnO, Al2O3, TiO2, CaO and/or MgO nanoparticles. The nanometer molten binary nitrate heat-transfer heat-storage medium solves the problem that the existing nanometer molten binary nitrate system has a low heat conductivity coefficient, poor heat stability and a narrow use temperature scope and can be widely used in the technical field of solar photo-thermal electricity generation.

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 binary nitric acid nanometer 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 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 range...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06F03G6/06F24J2/34
CPCY02E10/46
Inventor 曾智勇
Owner QINGHAI ENESOON NEW MATERIAL TECH & SCI CO LTD
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