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Heat-transfer fluid, preparation method for same and use thereof

A technology of heat transfer fluid and application, applied in the field of preparation of heat transfer fluid, can solve the problems of low solidification point of heat transfer fluid and high solidification point of heat transfer fluid, and achieve the effects of good thermal physical properties and good stability

Active Publication Date: 2012-05-02
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The purpose of the first aspect of the present invention is to propose a heat transfer fluid with a low solidification point to solve the technical problem of high solidification point of the heat transfer fluid in the prior art

Method used

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  • Heat-transfer fluid, preparation method for same and use thereof
  • Heat-transfer fluid, preparation method for same and use thereof
  • Heat-transfer fluid, preparation method for same and use thereof

Examples

Experimental program
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preparation example Construction

[0051] The preparation method of this heat transfer fluid comprises the following steps:

[0052] a) Get the raw material according to the mass percent of the above-mentioned components and components, wherein Ca(NO 3 ) 2 The raw material is Ca(NO 3 ) 2 4H 2 O(Ca(NO 3 ) 2 4H 2 The moisture contained in O is not included in the component mass);

[0053] b) Pour each component into a stainless steel container;

[0054] c) Heating to 200-220°C to make Ca(NO 3 ) 2 4H 2 The water in O is analyzed, thereby dissolving each component to obtain a dissolved salt mixture;

[0055] d) Expose the dissolved salt mixture to the air at 190-200°C for 1-2 hours, and after the water is completely evaporated, the heat transfer fluid is obtained.

[0056] Table 1 is the preferred components of the heat transfer fluid of the present invention and the content of the components.

[0057] Table 1

[0058]

[0059]

Embodiment 1

[0061] In the present embodiment, the components of the heat transfer fluid and the contents of the components are shown in Table 2:

[0062] Table 2

[0063]

[0064] 1. Description of the preparation process of heat transfer fluid

[0065] Take KNO 3 (purity>99%), LiNO 3 (purity>99%) to Ca(NO 3 ) 2 4H 2 O (purity >99%). KNO 3 、LiNO 3 , Ca(NO 3 ) 2 4H 2 O was ordered from Alpha-Aesar Co., UK. First, each nitrate is weighed separately, then poured into a stainless steel container, and heated in the atmosphere. The heating temperature was initially kept at about 200°C so that Ca(NO 3 ) 2 4H 2 The water in O is separated out, thereby dissolving the components. These molten salt mixtures are exposed to air for 1 hour in a high temperature environment (190-200° C.) to ensure that the water is completely evaporated to obtain molten salt mixtures, ie heat transfer fluids.

[0066] 2. The physical properties of the heat transfer fluid in the present embodiment

...

Embodiment 2

[0100] In this example, the components and contents of the heat transfer fluid are shown in Table 5, and the specific preparation method refers to Example 1.

[0101] table 5

[0102]

[0103] The physical properties of the heat transfer fluid in the present embodiment are as follows:

[0104] Melting point temperature: 78°C

[0105] Thermal conductivity: 0.42-0.44W / (m·k)

[0106] Cost: 0.81$ / kg

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Abstract

The invention relates to a heat-transfer fluid, and relates to a preparation method for the heat-transfer fluid and a use thereof. The heat-transfer fluid comprises the following components in percentages by mass: 50-80% of KNO3, 0-25% of LiNO3, and 10-45% of Ca(NO3)2. A method for preparing the heat-transfer fluid comprises the steps of heating, and exposing in a high-temperature environment. The heat-transfer fluid is used as a heat-transfer fluid for a solar thermal power plant. The heat-transfer fluid, the preparation method for the heat-transfer fluid and the use thereof disclosed by the invention solve the technical problem of high melting temperature of an inorganic salt mixture for preparing a heat-transfer fluid at present.

Description

technical field [0001] The present invention relates to a heat transfer fluid, and relates to the preparation method and application of the heat transfer fluid. Background technique [0002] A 100MW to 200MW solar thermal power plant needs thousands of tons of heat transfer fluid for heat collection and transmission, which requires high investment, so it is very important to maximize the thermal performance of the heat transfer fluid with the minimum cost. [0003] The current solar thermal power plants usually use organic oil (or synthetic oil) as the heat transfer fluid in the heat collecting area. Among existing heat transfer fluids, organic oil has a very low freezing point (less than 0°C), and the temperature resistance limit of organic oil is 393°C. The temperature resistance limit of the heat transfer fluid substantially limits the overall efficiency of the Rankine cycle (Rankine cycle), that is, the higher the temperature resistance limit, the lower the base electri...

Claims

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Application Information

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IPC IPC(8): C09K5/12F24J2/34F28D20/00
CPCY02E10/40Y02E70/30Y02E60/142Y02E60/14Y02P90/50
Inventor 赵长颖吴志根白丹
Owner SHANGHAI JIAO TONG UNIV
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