CN103743273B - Molten salt gravity-assisted heat pipe - Google Patents
Molten salt gravity-assisted heat pipe Download PDFInfo
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- CN103743273B CN103743273B CN201410014388.0A CN201410014388A CN103743273B CN 103743273 B CN103743273 B CN 103743273B CN 201410014388 A CN201410014388 A CN 201410014388A CN 103743273 B CN103743273 B CN 103743273B
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- heat pipe
- fused salt
- heat
- nitrate
- salt
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Abstract
The invention relates to a molten salt gravity-assisted heat pipe comprising a shell and molten salt. The molten salt can be ternary nitrate or quaternary nitrate. When the molten salt is ternary nitrate, ingredients include NaNO3, KNO3 and NaNO2; When the molten salt is quaternary nitrate, ingredients include NaNO3, KNO3, LiNO3 and Ca(NO3)2. The salt melting medium is rarely adaptable to reacting chemically with other substances in the using temperature range even when contacting with other substances, severe accidents of combustion, exploration and the like are eliminated, and no harmful and toxic gas is produced; the molten salt gravity-assisted heat pipe is low in cost, environmentally friendly, safe to use and simple in producing process.
Description
Technical field
The present invention relates to a kind of fused salt gravity assisted heat pipe, particularly relate to a kind of ternary nitrate or quaternary nitrate of mixing as the heat pipe of heat-transfer working medium, belong to high temperature gravity assisted heat pipe applied technical field.
Background technology
High temperature gravity assisted heat pipe is in fact a kind of heat conducting element efficiently, is in vacuum state in pipe, relies on the phase transformation of intraductal working medium to carry out heat exchange.To be working medium become steam in heat pipe evaporator section heat absorption to its course of work, and then rely on buoyancy lift to arrive condensation segment and release heat, liquefy working medium relies on gravity reflux to evaporator section, by this process of finishing the work that circulates.
1963, the people such as the Grove in U.S. LOS-Alamos laboratory developed high-temperature heat pipe first, had attracted numerous researcher to be engaged in high-temperature heat pipe research.High temperature gravity assisted heat pipe has been widely used in the fields such as space flight, waste heat recovery, electrical cooling and solar energy.
At present, the heat-transfer working medium of high temperature gravity assisted heat pipe generally adopts rare alkaline metal caesium Cs, the rubidium Rb of sodium Na, potassium K, lithium Li and relatively less application, then needs to select barium Ba, strontium Sr, calcium Ca, plumbous Pb, bismuth Bi, thallium Tl, indium In and silver-colored Ag etc. when operating temperature is higher.In the process of heat pipe work, these metals are fused solution and steam condition.Once there is heat pipe pipe explosion accident in the heat pipe in work, these metals or chance water, chlorine, nitrogen, carbon dioxide, acid or oxidant are understood vigorous combustion, explode, are brought about great losses, or belong to poisonous heavy metal, or in the earth's crust, content is rare, and the heat pipe made is expensive.
Fused salt is a kind of efficient heat transfer working medium with advantages such as density is large, boiling point is high, critical-temperature is high, the latent heat of vaporization is high, high temperature viscosity is low, saturated vapour pressure is low, Heat stability is goods.Under high temperature, the corrosivity of fused salt to most metal material is less, good with Metal Phase capacitive, contacts chemical reaction can not occur with many materials such as water, chlorine, nitrogen, carbon dioxide, acid or oxidant, the not danger such as burning, blast.Fused salt does not have toxicity, environmental friendliness, and rich reserves, production cost are low, is considered to the heat-transfer working medium with broad development prospect, conduct heat and be used widely in the field such as extensive accumulation of energy at nuclear reactor heat transfer and cooling, solar heat power generation system.Therefore using the heat-transfer working medium of fused salt as high temperature gravity assisted heat pipe, develop that a kind of safety, cost are low, the development of efficient fused salt gravity assisted heat pipe to high temperature gravity assisted heat pipe of conducting heat has facilitation.Gravity assisted heat pipe of the present invention, can be applicable to, between 400 DEG C-550 DEG C, to have heat transfer efficiency higher.
Summary of the invention
The object of the present invention is to provide a kind of fused salt gravity assisted heat pipe, the heat-transfer working medium of this gravity assisted heat pipe is a kind of mixing ternary nitrate or quaternary nitrate; Even if fused salt working medium provided by the present invention contact with other material within the scope of its serviceability temperature also should not with other material generation chemical reaction, can not to burn, the strong accident such as blast, also can not produce toxic and harmful; The heat pipe cost provided is low, environmental friendliness, use safety, manufacturing process are simple.Therefore, the present invention propose fused salt working medium and fused salt heat pipe meet current energy-saving and environmental protection, be conducive to the requirement of production safety.
For achieving the above object, the technical solution used in the present invention is a kind of fused salt gravity assisted heat pipe, and this gravity assisted heat pipe comprises shell, fused salt; Described fused salt can be ternary nitrate or quaternary nitrate; Wherein, when fused salt is ternary nitrate, composition is NaNO
3, KNO
3and NaNO
2, the mass percent of each component is,
NaNO
3：10％～40％；
KNO
3：40％～60％；
NaNO
2：30％～35％。
When fused salt is quaternary nitrate, composition is NaNO
3, KNO
3, LiNO
3with Ca (NO
3)
2, the mass percent of each component is,
NaNO
3：5％～15％；
KNO
3：40％～60％；
Li NO
3：5％～25％；
Ca(NO
3)
2：5％～30％。
The compound method of fused salt working medium of the present invention is,
S1 is according to proportioning, and the analysis of getting the nitrate of certain mass is pure, puts into beaker and tentatively stirs;
The salt-mixture carrying out preliminary stirring is put into homogenizer and is stirred 30-50 second by S2, makes mixed nitrate substantially admix evenly;
S3 puts in the Muffle furnace of belt stirrer by substantially admixing uniform salt-mixture, opens heating function and the agitating function of Muffle furnace simultaneously, salt-mixture is heated to fusing, until melt temperature is higher than its fusing point, stop stirring, constant muffle furnace, wait for that heat pipe fills.
Gravity assisted heat pipe implementation step of the present invention is,
S1 cleans shell inside on request, carries out the test of shell withstand voltage and vacuum-tightness;
Heat pipe package is put into electric tube furnace and is heated to more than heat pipe operating temperature by S2, is evacuated to absolute pressure 10 to shell simultaneously
-3below Pa, keeps 50-70 minute;
S3 takes out heat pipe package, at ambient pressure by the fusing of certain mass and well-mixed fused salt is filled with in shell;
The heat pipe of fused salt of substituting the bad for the good is reentered into heating furnace by S4, and on heat pipes heat to fused salt fusing point, opposite heat tube is evacuated to absolute pressure 10
-3below Pa, keeps 25-35 minute;
Namely S5 can be used as heat pipe and uses after heat pipe is carried out high-temperature soldering encapsulation.
Compared with prior art, the present invention has following beneficial effect.
1, fused salt working substance steam pressure is low, and heat transfer coefficient is high, compatible good, there is not chemical reaction with many materials, burn, the strong accident such as blast be not easily pollution-free, also not easily produces toxic and harmful, environmental friendliness;
2, fused salt heat pipe operating pressure is low, not easily pipe explosion accident occurs, and cost is low, and manufacturing process is simple.
Accompanying drawing explanation
Fig. 1 is gravity heat pipe structure schematic diagram.
In figure: 1, shell, 2, fused salt.
Detailed description of the invention
Instantiation 1: get mass percent and be respectively 10%NaNO
3, 55%KNO
3, 35%NaNO
2analysis pure, put into beaker and tentatively stir 3-5 minute; The salt-mixture carrying out preliminary stirring is put into homogenizer and stirs 30-50 second, make three kinds of salt component elementary mixing even; Then putting in the Muffle furnace of belt stirrer by substantially admixing uniform salt-mixture, opening heating function and the agitating function of Muffle furnace simultaneously, salt-mixture is heated to fusing, until melt temperature is higher than its fusing point 150 DEG C, stop stirring, constant muffle furnace, wait for that heat pipe fills.
Instantiation 2: get mass percent and be respectively 10%NaNO
3, 50%KNO
3, 15%Ca (NO3)
2, 25%Li NO
3analysis pure, put into beaker and tentatively stir 3-5 minute; The salt-mixture carrying out preliminary stirring is put into homogenizer and stirs 30-50 second, make four kinds of salt component elementary mixing even; Then putting in the Muffle furnace of belt stirrer by substantially admixing uniform salt-mixture, opening heating function and the agitating function of Muffle furnace simultaneously, salt-mixture is heated to fusing, until melt temperature is higher than its fusing point 100 DEG C, stop stirring, constant muffle furnace, wait for that heat pipe fills.
Instantiation 3: clean shell on request inner, carries out the withstand voltage and vacuum-tightness test of shell; Then shell is put into electric tube furnace and be heated to more than heat pipe operating temperature, absolute pressure 10 is evacuated to shell simultaneously
-3below Pa, keeps 50-70 minute; Then take out heat pipe package, 10%NaNO3,55%KNO3,35%NaNO2 and mass percent 20%NaNO will be respectively by mass percent at ambient pressure
3, 20%KNO
3, 30%Ca (NO3)
2, 30%Li NO
3the pure fused salt working medium made of analysis be filled with in two shells respectively; Afterwards the heat pipe of fused salt of substituting the bad for the good is reentered into heating furnace, on heat pipes heat to fused salt fusing point, opposite heat tube is evacuated to absolute pressure 10
-3below Pa, keeps 25-35 minute; Namely can be used as heat-transfer pipe after finally heat pipe being carried out high-temperature soldering encapsulation to use.
Claims (3)
1. a fused salt gravity assisted heat pipe, is characterized in that: this gravity assisted heat pipe comprises shell, fused salt; Described fused salt can be ternary nitrate or quaternary nitrate; Wherein, when fused salt is ternary nitrate, composition is NaNO
3, KNO
3and NaNO
2, the mass percent of each component is,
NaNO
3：10％；
KNO
3：55％～60％；
NaNO
2：30％～35％；
When fused salt is quaternary nitrate, composition is NaNO
3, KNO
3, LiNO
3with Ca (NO
3)
2, the mass percent of each component is,
NaNO
3：5％～15％；
KNO
3：40％～60％；
Li NO
3：5％～25％；
Ca(NO
3)
2：5％～30％；
The heat pipe of fused salt of substituting the bad for the good is reentered into heating furnace, and on heat pipes heat to fused salt fusing point, opposite heat tube is evacuated to absolute pressure 10
-3below Pa, keeps 25-35 minute.
2. a kind of fused salt gravity assisted heat pipe according to claim 1, is characterized in that: the compound method of described fused salt working medium is,
S1 is according to proportioning, and the analysis of getting the nitrate of certain mass is pure, puts into beaker and tentatively stirs;
The salt-mixture carrying out preliminary stirring is put into homogenizer and is stirred 30-50 second by S2, makes mixed nitrate substantially admix evenly;
S3 puts in the Muffle furnace of belt stirrer by substantially admixing uniform salt-mixture, opens heating function and the agitating function of Muffle furnace simultaneously, salt-mixture is heated to fusing, until melt temperature is higher than its fusing point, stop stirring, constant muffle furnace, wait for that heat pipe fills.
3. a kind of fused salt gravity assisted heat pipe according to claim 1, is characterized in that: described gravity assisted heat pipe implementation step is,
S1 cleans shell inside on request, carries out the test of shell withstand voltage and vacuum-tightness;
Heat pipe package is put into electric tube furnace and is heated to more than heat pipe operating temperature by S2, is evacuated to absolute pressure 10 to shell simultaneously
-3below Pa, keeps 50-70 minute;
S3 takes out heat pipe package, at ambient pressure by the fusing of certain mass and well-mixed fused salt is filled with in shell;
The heat pipe of fused salt of substituting the bad for the good is reentered into heating furnace by S4, and on heat pipes heat to fused salt fusing point, opposite heat tube is evacuated to absolute pressure 10
-3below Pa, keeps 25-35 minute;
Namely S5 can be used as heat pipe and uses after heat pipe is carried out high-temperature soldering encapsulation.
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| CN201410014388.0A CN103743273B (en) | 2014-01-13 | 2014-01-13 | Molten salt gravity-assisted heat pipe |
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|---|---|---|---|
| CN201410014388.0A CN103743273B (en) | 2014-01-13 | 2014-01-13 | Molten salt gravity-assisted heat pipe |
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| CN103743273B true CN103743273B (en) | 2015-07-01 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104110984B (en) * | 2014-07-21 | 2016-02-03 | 程新明 | Nanometer physics and chemistry heating power device and the heat power equipment containing this heating power device |
| CN104479645A (en) * | 2014-11-15 | 2015-04-01 | 北京工业大学 | Mixed carbonate heat transfer and heat storage working medium |
| CN105154029A (en) * | 2015-10-11 | 2015-12-16 | 郑叶芳 | Nanometer aluminium nitride modified fused salt and preparation method thereof |
| CN105219356A (en) * | 2015-10-30 | 2016-01-06 | 百吉瑞（天津）新能源有限公司 | A kind of fused salt mixt heat transfer accumulation of heat working medium and application thereof |
| CN107090273A (en) * | 2016-02-18 | 2017-08-25 | 百吉瑞（天津）新能源有限公司 | A kind of fused salt mixt heat transfer accumulation of heat working medium, preparation method and applications |
| CN105953446A (en) * | 2016-06-14 | 2016-09-21 | 范多旺 | Low-melting-point salt linear Fresnel type solar heat collecting system |
| CN110375371A (en) * | 2019-06-20 | 2019-10-25 | 西安交通大学 | A kind of low ebb electric-heating heat-conductive oil and fused salt accumulation of heat hybrid heating system |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US4760878A (en) * | 1985-12-13 | 1988-08-02 | Showa Aluminum Corporation | Process for producing heat pipe |
| JP2720365B2 (en) * | 1991-03-13 | 1998-03-04 | 株式会社フジクラ | Heat pipe manufacturing method |
| US6907918B2 (en) * | 2002-02-13 | 2005-06-21 | Thermal Corp. | Deformable end cap for heat pipe |
| CN101659857A (en) * | 2008-08-28 | 2010-03-03 | 北京玉佳明三态离子科学研究院有限公司 | Formulation and manufacturing method of efficient heat-transfer heat-pipe working medium |
| CN101852563A (en) * | 2009-03-30 | 2010-10-06 | 童裳慧 | Heat pipe type buried low-temperature efficient heat exchange tube for underground heat exchange |
| CN103074040B (en) * | 2013-01-01 | 2016-06-01 | 北京工业大学 | Low melting point fused salt mixt heat transfer heat storage medium |
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