CN102734922A - Electric heater for high temperature air - Google Patents
Electric heater for high temperature air Download PDFInfo
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- CN102734922A CN102734922A CN2011100856418A CN201110085641A CN102734922A CN 102734922 A CN102734922 A CN 102734922A CN 2011100856418 A CN2011100856418 A CN 2011100856418A CN 201110085641 A CN201110085641 A CN 201110085641A CN 102734922 A CN102734922 A CN 102734922A
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- sealed pressure
- electric heating
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- pressure vessel
- heating tube
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Abstract
The invention discloses an electric heater for high temperature air, and the electric heater is composed of hollow electric heating pipes, a sealed pressure container provided with a cold air inlet and a hot air outlet, a front end insulated fixing element and a tail end insulated sealing fixing element, wherein the tail end of the sealed pressure container is sealed, the hot air outlet is arranged on the front end of the sealed pressure container, the cold air inlet is arranged on the wall (close to the front end) of the pressure container, in the sealed pressure container, the front end insulated fixing element is arranged between the cold air inlet and the hot air outlet, the tail end insulated sealing fixing element is arranged at a position (close to the tail end) in the sealed pressure container, the plurality of hollow electric heating pipes are fixed in the sealed pressure container through the front end insulated fixing element and the tail end insulated sealing fixing element, gaps are reserved among the electric heating pipes and among the electric heating pipes and the inner wall of the sealed pressure container, and the electric heater for the high temperature air utilizing the structure provided by the invention has the advantages of small volume, high power, high efficiency, energy saving, material saving, large gas flow rate, small flow resistance, high heating and cooling speed, good safety and anti-explosion property, etc.
Description
Technical field
The present invention relates to electric airheater, be meant a kind of high-temperature air electric heater field especially.
Background technology
At present, the heating of tubing heat exchanger commonly used must generally be the magnesium powder through inserts, and heat is passed to the heating tube wall, carries out heat exchange with air again; This mode exists following disadvantage, and 1, heating efficiency is not high, 2, the heat waste consumption is big; The waste mass energy, 3, programming rate is slow, 4, maximum temperature is low; 5, dangerous, 6, the life-span is short, 7, shortcoming such as big takes up room.
The present invention has overcome above shortcoming, makes in many places that need high temperature air such as field and weapon industry at chemical industry, electric power, aviation and is used widely.
Summary of the invention
The object of the present invention is to provide a kind of heating efficiency high, energy-conservation, programming rate is fast, safety, and the life-span is long, takes up room the high-temperature air heater that materials used is few.
The technical scheme that adopts for solving the problems of the technologies described above is a kind of high-temperature air electric heater; Constitute by the electric heating tube of hollow, sealed pressure vessel, front end insulating fixing piece and tail end insulated enclosure fixture with inlet of cold air and hot air outlet; The sealed pressure vessel tail end sealing; Front end is provided with hot air outlet; On pressure vessel wall, be provided with inlet of cold air near front end, inner at sealed pressure vessel, be provided with the front end insulating fixing piece between inlet of cold air and the hot air outlet; The front end insulating fixing piece is provided with plurality of holes and is used for fixing electric heating tube; Be provided with tail end insulated enclosure fixture in sealed pressure vessel inside near tail end, tail end insulated enclosure fixture is provided with plurality of holes and is used for fixing electric heating tube, and the electric heating tube of some hollows is fixed on sealed pressure vessel inside through front end insulating fixing piece and tail end insulated enclosure fixture; Leave the space between the electric heating tube and between electric heating tube and the sealed pressure vessel inwall, be beneficial to circulation of air.
The electric heating tube of preferred hollow is processed by nickel-bass alloy material, and promptly high temperature resistant have good electrical heating performance again.
The electric heating tube number of the hollow of optimum seeking method is 30-33.
Preferably also be provided with the explosion-proof wiring case at the sealed pressure vessel afterbody.
Employing lets Cryogenic air circulate from the inwall of container and the outside of electric heater heating pipe, flows out such structure from heat-generating pipe is inner then.Can make that the outside wall temperature of container can be too not high, can make full use of heat energy again, improve the efficiency of heating surface.This reform is obvious especially aspect efficiency of heating surface contrast, and conventional heating is that the heat that heater is produced is delivered on the heating shell through insulator again, the heat exchange of final completion and medium, and efficient can be greater than 0.85.And the heat exchange mode of this heater adopts inside and outside wall while and medium direct heat transfer, has avoided intermediate link, improves heat exchange efficiency greatly, and efficient can reach about 0.93.
The light-wall pipe that adopts 30 ~ 33 nickel-bass alloy materials making is as heater and baffle, and the conventional heating heater of its sectional area ratio increases tens times.It is more to make that heater increases aspect mechanical performance and intensity.Not fragile under the impact of high temperature (800 ℃) high flow rates (600Kg/h) high pressures (3MPa) air-flow, can reach about 20 years service life.The heating of conventional electric heater is generally 5 years service life under normal operating condition.
Select directly contact heated medium (air) of heater for use, and it is in shell outer wall and inwall forced-convection heat transfer simultaneously with the heat exchange of medium, the middle heat transfer link of nothing, so its programming rate is very fast, and thermal inertia is very little.Heating rate can reach 11 ℃/S.And the conventional magnesium powder that uses does not have advantage in this respect as the heating of insulation filling material, and it makes that as the filling magnesium powder of insulation and heat transfer the thermal inertia of this class component is bigger, and intensification/rate of temperature fall is restricted.
Because adopt this medium circulation style, though temperature reaches 800 ℃ at the heater outlet place, the case surface temperature of heater not high (being lower than 50 ℃) can reach the highest temperature grade in explosive-proof grade.
The heater that adopts this structure is energy savings greatly.Conventional heating heater had not both reached such high temperature (generally about 450 ℃), also can give out great amount of heat via container outer wall, even install the insulation measure additional, the heat of its loss also accounts for the 10%-15% of total amount of heat.The percentage of heat waste consumption is along with the temperature difference in container and the heat-insulation layer and the external world increases and increases, and the temperature difference is big more, thermal losses bigger (conventional heater is 450 ℃ and 20 ℃).The heater chamber wall of the present invention and the extraneous temperature difference less (50 ℃ and 20 ℃).
High-temperature air heater is simple in structure, and volume is little, economical with materials.Conventional its heating of heater is in manufacturing process, and not only technology is numerous and diverse, and installation be take up room bigger, the air heater of same power, high temperature heater (HTH) will be littler lighter than conventional heater.
Beneficial effect of the present invention has that volume is little, power is big, efficient is high, energy-conservation a, material-saving, advantages such as gas flow is big, flow resistance is little, temperature rate is high, safety anti-explosive.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further explain.
Fig. 1 is the structural representation of high-temperature air electric heater.
Fig. 2 is the structural representation of front end insulating fixing piece.
Wherein icon 1, inlet of cold air, icon 2, hot air outlet, icon 3, sealed pressure vessel, the electric heating tube of icon 4, hollow, icon 5, front end insulating fixing piece, icon 6 tail end insulated enclosure fixtures, icon 7, explosion-proof wiring case.
The specific embodiment
With reference to Fig. 1, a kind of high-temperature air electric heater; Constitute by the electric heating tube 4 of hollow, sealed pressure vessel 3, front end insulating fixing piece 5 and tail end insulated enclosure fixture 6 with inlet of cold air 1 and hot air outlet 2; The sealed pressure vessel tail end sealing; Front end is provided with hot air outlet 2; On pressure vessel 3 walls, be provided with inlet of cold air 1,, be provided with front end insulating fixing piece 5 between inlet of cold air 1 and the hot air outlet 2 in sealed pressure vessel 3 inside near front end; Front end insulating fixing piece 5 is provided with plurality of holes and is used for fixing electric heating tube 4; Be provided with tail end insulated enclosure fixture 6 in sealed pressure vessel 3 inside near tail end, tail end insulated enclosure fixture 6 is provided with plurality of holes and is used for fixing electric heating tube 4, and the electric heating tube 4 of some hollows is fixed on sealed pressure vessel 3 inside through front end insulating fixing piece 5 and tail end insulated enclosure fixture 6; Leave the space between the electric heating tube 4 and between electric heating tube 4 and sealed pressure vessel 3 inwalls, be beneficial to circulation of air.
The electric heating tube of preferred hollow is processed by nickel-bass alloy material, and promptly high temperature resistant have good electrical heating performance again.
The electric heating tube number of the hollow of optimum seeking method is 30-33.
Preferably also be provided with explosion-proof wiring case 7 at the sealed pressure vessel afterbody.
Claims (4)
1. high-temperature air electric heater; Constitute by the electric heating tube of hollow, sealed pressure vessel, front end insulating fixing piece and tail end insulated enclosure fixture with inlet of cold air and hot air outlet; The sealed pressure vessel tail end sealing; Front end is provided with hot air outlet, on the pressure vessel wall near front end, is provided with inlet of cold air, and is inner at sealed pressure vessel; Be provided with the front end insulating fixing piece between inlet of cold air and the hot air outlet; The front end insulating fixing piece is provided with plurality of holes and is used for fixing electric heating tube, is provided with tail end insulated enclosure fixture in sealed pressure vessel inside near tail end, and tail end insulated enclosure fixture is provided with plurality of holes and is used for fixing electric heating tube; The electric heating tube of some hollows is fixed on sealed pressure vessel inside through front end insulating fixing piece and tail end insulated enclosure fixture, leaves the space between the electric heating tube and between electric heating tube and the sealed pressure vessel inwall.
2. high-temperature air electric heater according to claim 1 is characterized in that the electric heating tube of hollow is processed by nickel-bass alloy material.
3. high-temperature air electric heater according to claim 1, the electric heating tube number that it is characterized in that hollow is 30-33.
4. high-temperature air electric heater according to claim 1 is characterized in that also being provided with the explosion-proof wiring case at the sealed pressure vessel afterbody.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100856418A CN102734922A (en) | 2011-04-07 | 2011-04-07 | Electric heater for high temperature air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100856418A CN102734922A (en) | 2011-04-07 | 2011-04-07 | Electric heater for high temperature air |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102734922A true CN102734922A (en) | 2012-10-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100856418A Pending CN102734922A (en) | 2011-04-07 | 2011-04-07 | Electric heater for high temperature air |
Country Status (1)
| Country | Link |
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| CN (1) | CN102734922A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104748371A (en) * | 2015-03-23 | 2015-07-01 | 西北工业大学 | Resistive heater used for engine combustion chamber experiment system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5641420A (en) * | 1995-09-06 | 1997-06-24 | Lakewood Engineering & Mfg. Co. | Electric heater having coil with loop that passes through aperture in support |
| CN101592400A (en) * | 2009-06-04 | 2009-12-02 | 中国航空工业集团公司西安飞机设计研究所 | High-temperature air stainless steel tube electric heater |
| CN201497164U (en) * | 2009-08-21 | 2010-06-02 | 王太峰 | Silting prevention type electric heater |
| CN101776398A (en) * | 2010-02-23 | 2010-07-14 | 苏州汇科机电设备有限公司 | Gas preheater of sintering furnace of electronic components |
| CN101813372A (en) * | 2009-02-25 | 2010-08-25 | 中国科学院工程热物理研究所 | Pressure-bearing high-temperature air electric heater |
-
2011
- 2011-04-07 CN CN2011100856418A patent/CN102734922A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5641420A (en) * | 1995-09-06 | 1997-06-24 | Lakewood Engineering & Mfg. Co. | Electric heater having coil with loop that passes through aperture in support |
| CN101813372A (en) * | 2009-02-25 | 2010-08-25 | 中国科学院工程热物理研究所 | Pressure-bearing high-temperature air electric heater |
| CN101592400A (en) * | 2009-06-04 | 2009-12-02 | 中国航空工业集团公司西安飞机设计研究所 | High-temperature air stainless steel tube electric heater |
| CN201497164U (en) * | 2009-08-21 | 2010-06-02 | 王太峰 | Silting prevention type electric heater |
| CN101776398A (en) * | 2010-02-23 | 2010-07-14 | 苏州汇科机电设备有限公司 | Gas preheater of sintering furnace of electronic components |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104748371A (en) * | 2015-03-23 | 2015-07-01 | 西北工业大学 | Resistive heater used for engine combustion chamber experiment system |
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Application publication date: 20121017 |