CN108151567A - A kind of circumferential weld runner type molten salt heater - Google Patents
A kind of circumferential weld runner type molten salt heater Download PDFInfo
- Publication number
- CN108151567A CN108151567A CN201810059561.7A CN201810059561A CN108151567A CN 108151567 A CN108151567 A CN 108151567A CN 201810059561 A CN201810059561 A CN 201810059561A CN 108151567 A CN108151567 A CN 108151567A
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- China
- Prior art keywords
- heater
- circumferential weld
- molten salt
- inner sleeve
- type molten
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
- F28D2020/0047—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material using molten salts or liquid metals
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Resistance Heating (AREA)
Abstract
The invention discloses a kind of circumferential weld runner type molten salt heaters, it includes the heating part being coaxially disposed from the inside to the outside, an inner sleeve and an outer tube, the heating part sealing is set in the inner sleeve, the inner sleeve and the outer tube are enclosed a circumferential weld runner for fused salt circulation, and uniform ring is equipped with heat exchange fin on the outer wall of the inner sleeve.The circumferential weld runner type molten salt heater improves heat exchange efficiency, reduces the temperature difference of heater wall temperature and temperature of molten salt, effectively increases the service life of heater, and easy to maintain.
Description
Technical field
The invention belongs to electric heating equipment technical field, specially a kind of circumferential weld runner type molten salt heater.
Background technology
With the fast development of global New Energy Industry, the randomnesss such as wind-power electricity generation and solar energy and intermittent very strong hair
Electric mode proposes quite high challenge to the normal operation management of power grid.Using the energy storage technology of fused salt as a heat transfer medium,
The interior energy of heat energy utilization fused salt that new energy or trough-electricity are sent out is converted to store or send out energy, makes generation of electricity by new energy system
System has energy storage and night generating capacity, meets peak load regulation network needs, has very strong economic advantages.
The challenge that the increasingly extensive use of fused salt proposes molten salt heater is as follows：1st, can realize high temperature, 600 DEG C with
On；2nd, highly corrosion resistant.The generating efficiency of energy storage is positively related with temperature of molten salt, but heater temperature in use is limited to tie
Structure material allowable temperature.How to reduce the temperature difference of heater wall temperature and temperature of molten salt becomes the crucial ring that heater designs
Section.The experimental study of fused salt proposes heater new requirement, and experiment condition is mostly that flow is small, temperature is high.If using normal
The heat form of rule, fused-salt medium are in the heater laminar flow, and heat exchange is poor, and heater wall temperature will be more than existing structure material
The allowable temperature of material seriously affects the service life of heater, and not easy care.
Invention content
In order to overcome low above-mentioned molten salt heater heat exchange efficiency of the existing technology, heater wall temperature and fused salt temperature
The temperature difference of degree is big, service life is short, not easy care the problem of, the present invention provides a kind of circumferential weld runner type molten salt heaters, carry
High heat exchange efficiency reduces the temperature difference of heater wall temperature and temperature of molten salt, effectively increases the service life of heater,
It is and easy to maintain.
In order to achieve the above object, the present invention adopts the following technical scheme that：
The present invention provides a kind of circumferential weld runner type molten salt heater, including be coaxially disposed from the inside to the outside a heating part,
One inner sleeve and an outer tube, the heating part sealing are set in the inner sleeve, and the inner sleeve and the outer tube enclose
A circumferential weld runner for fused salt circulation is formed, uniform ring is equipped with heat exchange fin on the outer wall of the inner sleeve.
In the present invention, the heat exchange fin can be this field routine fin, preferably spiral fin.
Preferably, the outer tube is connect with the bottom of the inner sleeve by a positioning parting bead, for ensureing concentricity,
Avoid the occurrence of hot spot.
Preferably, the upper top surface of the inner sleeve and bottom surface are respectively equipped with a upper sealing plate and once sealing plate.
Preferably, the heating part includes a heater and a binding post, the heater is set in the inner sleeve
At the heart, the binding post is connect with the top of the heater, and is connect from the upper sealing plate through drawing with heating equipment.
It is described further preferably, being additionally provided with one section of upper thermal insulating layer between the upper end of the upper sealing plate and the heater
One section of lower thermal insulating layer is additionally provided between lower sealing plate and the bottom end of the heater.
Preferably, the lower end of the outer tube, upper end are respectively equipped with a fused salt entrance and fused salt outlet.More preferably, institute
It states fused salt entrance and fused salt outlet wears the wall surface of the outer tube, and be connected with the circumferential weld runner respectively.This hair
In bright, at work, fused salt enters the circumferential weld runner type molten salt heater from fused salt entrance, by heating in circumferential weld runner
Portion is heated, and is exported and is discharged from fused salt.
In the present invention, the pipe wall material of the outer tube and the inner sleeve generally uses the corrosion resistance of this field routine
Alloy material, such as 304 stainless steels, 316 stainless steels, Hastelloy etc..
On the basis of common knowledge of the art, above-mentioned each optimum condition can be combined arbitrarily to get each preferable reality of the present invention
Example.
The reagents and materials used in the present invention are commercially available.
The positive effect of the present invention is：
Circumferential weld runner type molten salt heater provided by the invention according to actual demand, can select the inner sleeve of suitable dimension
Pipe, outer tube, enclose the circumferential weld runner of suitable width, the fused salt fluid in circumferential weld runner are made to be in required flow regime, together
When by interior sleeve outer wall install additional fin, effectively increase heat exchange area, improve heat exchange efficiency, reduce heater wall
The temperature difference of temperature and temperature of molten salt effectively increases the service life of heater.In addition, heating element completely cuts off with fused-salt medium,
It can easily be taken out from inner sleeve upper end, be easy to be safeguarded and be replaced.
Description of the drawings
Fig. 1 is the circumferential weld runner type molten salt heater schematic diagram described in embodiment 1；
Fig. 2 is circumferential weld runner type molten salt heater schematic top plan view described in embodiment 1；
In above-mentioned attached drawing, 1, fused salt entrance, 2, outer tube, 3, inner sleeve, 31, lower thermal insulating layer, 32, upper thermal insulating layer, 33, connect
Terminal, 34, heater, 35, upper sealing plate, 36, lower sealing plate, 37, positioning parting bead, 4, fused salt outlet, 5, heat exchange fin.
Specific embodiment
It is further illustrated the present invention below by the mode of embodiment, but does not therefore limit the present invention to the reality
It applies among a range.Test method without specific conditions in the following example, according to conventional methods and conditions or according to quotient
Product specification selects.
Embodiment 1
Circumferential weld runner type molten salt heater as illustrated in fig. 1 and 2, including outer tube 2 and inner sleeve 3, outer tube 2 and inner sleeve
3 welded seal of pipe, is enclosed circumferential weld runner, and passes through and position the guarantee concentricity of parting bead 37, avoids the occurrence of hot spot；Inner sleeve 3
Outer wall on by spot welding mode be equipped with spiral fin 5；The upper top surface of inner sleeve 3 and bottom surface are respectively equipped with upper sealing plate 35 under
Sealing plate 36 is equipped with heater 34 at the inside center of inner sleeve 3, and binding post 33 is connect with the top of heater 34, and from upper envelope
Plate 35 is connect through drawing with heating equipment；Upper thermal insulating layer 32, lower envelope are additionally provided between the upper end of upper sealing plate 35 and heater 34
Lower thermal insulating layer 31 is additionally provided between the bottom end of plate 36 and heater 34.
The circumferential weld runner type molten salt heater power is 30Kw, and the pipe wall material of outer tube 2 and inner sleeve 3 is Kazakhstan conjunction
Gold, diameter are respectively 0.03m and 0.02m, and the fever segment length of heater 34 is 1m, and the width of circumferential weld runner is 0.005m, spiral shell
The width for revolving fin 5 is 2mm, is highly 3mm, screw pitch 12.5mm, the number of turns 80.Fused salt is heated using the molten salt heater
LiF-NaF-KF (46.5-11.5-42mol%, c=1880J/ (KgK), ρ=2035kg/m3, μ=0.003557Pas, λ
=0.812W/ (mK), flow rate of molten salt 0.35Kg/s, fused salt enter from fused salt entrance 1, and heater is passed through in circumferential weld runner
34 heating, from 4 discharge of fused salt outlet.
It is calculated according to formula I, II, III and IV, convection transfer rate 3661W/m2/ k, heater wall temperature
With 74 DEG C of the temperature difference of temperature of molten salt.
Specific calculating process is as follows：
Fused-salt medium reynolds number Re and Prandtl number Pr are determined first：
Re=ρ vd/ μ I
Pr=c μ/λ II
Wherein c, ρ, μ and λ is respectively thermal capacitance, density, viscosity coefficient and the thermal conductivity factor of fused salt fluid, v, d for flow velocity with
Characteristic length.
Then nusselt number Nu and convection transfer rate h are determined according to heat convection criterion numeral equation：
Nu=F (Re, Pr)=hd/ λ III
The temperature difference Τ of heater wall temperature and fused-salt medium temperature is finally obtained：
Δ Τ=Q/hA IV
Wherein Q and A is respectively that heater power is accumulated with heater surface.
Comparative example 1
3 outer wall of inner sleeve is not provided with spiral fin, and other conditions are the same as embodiment 1.It is calculated according to formula I, II, III and IV
It obtains, convection transfer rate 2273W/m2209 DEG C of the temperature difference of/k, heater wall temperature and temperature of molten salt.
Comparative example 2
Heat channel molten salt heater using single, pipe diameter 0.03m, pipe wall material is Hastelloy, heating and
The identical fused salt of embodiment 1, flow rate of molten salt 0.35Kg/s.It is calculated according to formula I, II, III and IV, heat convection system
Number is 1140W/m2418 DEG C of the temperature difference of/k, heater wall temperature and temperature of molten salt.
Claims (10)
1. a kind of circumferential weld runner type molten salt heater, which is characterized in that it includes the heating part being coaxially disposed from the inside to the outside, one
Inner sleeve and an outer tube, the heating part sealing are set in the inner sleeve, and the inner sleeve and the outer tube enclose shape
Into the circumferential weld runner of a confession fused salt circulation, uniform ring is equipped with heat exchange fin on the outer wall of the inner sleeve.
2. circumferential weld runner type molten salt heater as described in claim 1, which is characterized in that the heat exchange fin is spiral ribs
Piece.
3. circumferential weld runner type molten salt heater as described in claim 1, which is characterized in that the outer tube and the inner sleeve
Bottom pass through one positioning parting bead connect.
4. circumferential weld runner type molten salt heater as described in claim 1, which is characterized in that the upper top surface of the inner sleeve is under
Bottom surface is respectively equipped with a upper sealing plate and once sealing plate.
5. circumferential weld runner type molten salt heater as claimed in claim 4, which is characterized in that the heating part includes a heater
With a binding post, the heater is set at the center of the inner sleeve, and the binding post is connect with the top of the heater,
And it is connect from the upper sealing plate through drawing with heating equipment.
6. circumferential weld runner type molten salt heater as claimed in claim 5, which is characterized in that the upper sealing plate and the heater
Upper end between be additionally provided with one section of upper thermal insulating layer, be additionally provided between the lower sealing plate and the bottom end of the heater under one section adiabatic
Layer.
7. circumferential weld runner type molten salt heater as described in claim 1, which is characterized in that lower end, the upper end of the outer tube
It is respectively equipped with a fused salt entrance and fused salt outlet.
8. circumferential weld runner type molten salt heater as claimed in claim 7, which is characterized in that the fused salt entrance and the fused salt
Outlet wears the wall surface of the outer tube respectively, and is connected with the circumferential weld runner.
9. such as claim 1-8 any one of them circumferential weld runner type molten salt heaters, which is characterized in that the outer tube and institute
The pipe wall material for stating inner sleeve is corrosion-resistancealloy alloy materials.
10. circumferential weld runner type molten salt heater as claimed in claim 9, which is characterized in that the corrosion-resistancealloy alloy materials
It is any in 304 stainless steels, 316 stainless steels and Hastelloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810059561.7A CN108151567A (en) | 2018-01-22 | 2018-01-22 | A kind of circumferential weld runner type molten salt heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810059561.7A CN108151567A (en) | 2018-01-22 | 2018-01-22 | A kind of circumferential weld runner type molten salt heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108151567A true CN108151567A (en) | 2018-06-12 |
Family
ID=62461855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810059561.7A Pending CN108151567A (en) | 2018-01-22 | 2018-01-22 | A kind of circumferential weld runner type molten salt heater |
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| Country | Link |
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| CN (1) | CN108151567A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12012827B1 (en) | 2023-09-11 | 2024-06-18 | Natura Resources LLC | Nuclear reactor integrated oil and gas production systems and methods of operation |
| US12018779B2 (en) | 2021-09-21 | 2024-06-25 | Abilene Christian University | Stabilizing face ring joint flange and assembly thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203177515U (en) * | 2013-04-02 | 2013-09-04 | 淮南中科储能科技有限公司 | Sleeve type high-temperature molten salt heat exchanger |
| CN103375946A (en) * | 2012-04-18 | 2013-10-30 | 珠海格力电器股份有限公司 | refrigerant heating device |
| CN104010397A (en) * | 2014-04-01 | 2014-08-27 | 镇江市三维电加热器有限公司 | FLiNaK fused salt electric heater for thorium-based nuclear energy system |
| CN106091776A (en) * | 2016-08-09 | 2016-11-09 | 天津滨海储能技术有限公司 | Molten salt energy-storage heat-exchanger rig |
| KR20170092811A (en) * | 2016-02-04 | 2017-08-14 | 한국기계연구원 | Heat exchanger of molten salt |
| CN207850147U (en) * | 2018-01-22 | 2018-09-11 | 中国科学院上海应用物理研究所 | A kind of circumferential weld runner type molten salt heater |
-
2018
- 2018-01-22 CN CN201810059561.7A patent/CN108151567A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103375946A (en) * | 2012-04-18 | 2013-10-30 | 珠海格力电器股份有限公司 | refrigerant heating device |
| CN203177515U (en) * | 2013-04-02 | 2013-09-04 | 淮南中科储能科技有限公司 | Sleeve type high-temperature molten salt heat exchanger |
| CN104010397A (en) * | 2014-04-01 | 2014-08-27 | 镇江市三维电加热器有限公司 | FLiNaK fused salt electric heater for thorium-based nuclear energy system |
| KR20170092811A (en) * | 2016-02-04 | 2017-08-14 | 한국기계연구원 | Heat exchanger of molten salt |
| CN106091776A (en) * | 2016-08-09 | 2016-11-09 | 天津滨海储能技术有限公司 | Molten salt energy-storage heat-exchanger rig |
| CN207850147U (en) * | 2018-01-22 | 2018-09-11 | 中国科学院上海应用物理研究所 | A kind of circumferential weld runner type molten salt heater |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12018779B2 (en) | 2021-09-21 | 2024-06-25 | Abilene Christian University | Stabilizing face ring joint flange and assembly thereof |
| US12012827B1 (en) | 2023-09-11 | 2024-06-18 | Natura Resources LLC | Nuclear reactor integrated oil and gas production systems and methods of operation |
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