CN113432295B - Spiral high-flow ultrahigh-temperature air electric heater - Google Patents
Spiral high-flow ultrahigh-temperature air electric heater Download PDFInfo
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- CN113432295B CN113432295B CN202110644003.9A CN202110644003A CN113432295B CN 113432295 B CN113432295 B CN 113432295B CN 202110644003 A CN202110644003 A CN 202110644003A CN 113432295 B CN113432295 B CN 113432295B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
- F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
- F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1854—Arrangement or mounting of grates or heating means for air heaters
- F24H9/1863—Arrangement or mounting of electric heating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2064—Arrangement or mounting of control or safety devices for air heaters
- F24H9/2071—Arrangement or mounting of control or safety devices for air heaters using electrical energy supply
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- 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
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The application discloses large-traffic super high temperature air electric heater of spiral relates to air heating technical field. The electric heater comprises an upper end enclosure, a cylinder, a lower end enclosure, a cooling gas inlet pipeline, a cooling gas outlet pipeline, an inlet pipeline, a gas outlet pipeline, a spiral channel, a plurality of silicon-molybdenum rods, a plurality of ceramic rods, a channel base and a channel cover plate. In order to reach the air temperature of at least 1650K, the silicon-molybdenum rod is selected as the resistance heating element, and the silicon-molybdenum rod element can work at the rod temperature of 1800 ℃ for a long time without deformation and breakage, so that the silicon-molybdenum rod element is a good heating element suitable for high-temperature atmosphere. Tens of silicon-molybdenum rods are connected in series in the spiral channel to form the continuous heating device, so that the continuous heating device has the characteristics of simple structure, high space utilization rate, small thermal deformation of the channel, pure air after heating and high heating temperature, and can meet the high-temperature air inlet requirement of a ground verification test of the hypersonic aircraft.
Description
Technical Field
The application relates to the technical field of air heating, in particular to a spiral electric heater capable of providing large-flow ultrahigh-temperature incoming air required by ground verification test of a hypersonic aircraft.
Background
When the hypersonic aircraft flies at a high Mach number, hypersonic airflow gradually decelerates to a subsonic state through multiple shock waves in an air inlet channel, kinetic energy of the gas is converted into thermodynamic energy, the decelerated gas is ultrahigh-temperature gas, and for example, the total temperature of the airflow can reach 1650K at the flying speed of Mach 6. In order to verify the thermodynamic performance of each component of the aircraft in a ground state, an air heating device needs to be built to provide high-flow and ultrahigh-temperature air so as to simulate high-temperature airflow of the aircraft during hypersonic flight.
So far, the most practical and commonly used continuous ultra-high temperature air heating methods mainly include electric arc heating, combustion heating, heat storage heating, resistance heating and the like. Taking arc heating as an example, arc heating has problems with NOx, electrode contamination, and flow non-uniformity.
Therefore, it is urgently needed to develop an electric heater which can meet the high-temperature air inlet requirement of the ground verification test of the hypersonic aircraft and can heat the air to be pure.
Disclosure of Invention
It is an object of the present application to overcome the above problems or to at least partially solve or mitigate the above problems.
The application provides a large-traffic ultra-high temperature air electric heater of spiral includes:
the upper end enclosure, the cylinder and the lower end enclosure are sequentially connected from top to bottom through flanges to form a shell of the electric heater together;
the cooling gas inlet pipeline and the cooling gas outlet pipeline are oppositely arranged at the upper end socket and are communicated with the inside of the upper end socket;
the air inlet pipeline and the air outlet pipeline are arranged at the lower end enclosure and are used as an air inlet channel and an air outlet channel, and corresponding heat insulation layers are arranged in the air inlet pipeline and the air outlet pipeline so as to reduce heat loss;
the spiral channel is an air flow channel formed by pouring high-temperature-resistant materials and is arranged in the cylinder, and a heat-insulating layer is arranged between the spiral channel and the cylinder;
a plurality of silicon-molybdenum rods which are sequentially arranged in series in the spiral channel and used for heating;
the ceramic rods are embedded in the spiral channel side by side and positioned at the downstream position of each silicon-molybdenum rod, and are used for enhancing the overall structural strength of the spiral channel and preventing the silicon-molybdenum rods from deforming at high temperature;
the channel base is formed on the inner wall of the lower end enclosure, is formed by pouring high-temperature-resistant materials and is used for supporting the spiral channel, and vent holes are formed in the channel base at positions corresponding to the air inlet pipeline and the air outlet pipeline so as to communicate the air inlet pipeline and the air outlet pipeline with the spiral channel; and
the channel cover plate is formed by pouring high-temperature-resistant material pouring materials, is arranged at the top of the cylinder, is used for gas sealing of the spiral channel, and is also used as a force bearing structure of the silicon-molybdenum rods.
Optionally, the inlet duct is configured to interface cryogenic air into the electric heater, the outlet duct is configured to interface heated air out of the electric heater, the inlet duct, the spiral channel, and the outlet duct are configured to: and low-temperature air flows into the channel base and the spiral channel from the air inlet pipeline, turns to flow inwards along the spiral line direction of the spiral channel after flowing upwards and meets the channel cover plate, and the air exchanges heat with the high-temperature silicon-molybdenum rod heated by power supply in a convection way, and also exchanges heat with the high-temperature channel wall heated by the radiation of the silicon-molybdenum rod in a convection way to increase the temperature, finally converges downwards at the tail end of the spiral channel and flows out of the heater from the air outlet pipeline through the channel base.
Optionally, the cooling gas inlet pipe and the cooling gas outlet pipe are interfaces through which other cold air slightly higher than the pressure of the heating air enters and exits the electric heater, and are used for cooling the hot end of the silicon-molybdenum rod and the electric connecting piece in a space formed by the channel cover plate and the upper end enclosure.
Optionally, the heat preservation layer arranged in the air inlet pipeline is an air inlet pipeline heat preservation felt and an air inlet pipeline fireproof cement layer, and the air inlet pipeline heat preservation felt and the air inlet pipeline fireproof cement layer are sequentially arranged along the direction from the inner wall of the air inlet channel to the channel.
Optionally, the heat preservation layer arranged in the air outlet pipeline is an air outlet pipeline heat preservation felt, an air outlet pipeline refractory cement layer and a heat insulation coating layer, and the air outlet pipeline heat preservation felt, the air outlet pipeline refractory cement layer and the heat insulation coating layer are sequentially arranged along the direction from the inner wall of the air outlet pipeline to the channel.
Optionally, the spiral channel, the channel base and the channel cover plate are all cast from corundum materials.
Optionally, a lower seal head heat preservation felt is padded between the channel base and the lower seal head.
Optionally, a cylinder heat-insulating felt is padded between the channel cover plate and the cylinder.
Optionally, a stepped hole is formed in the channel cover plate at a position corresponding to each silicon-molybdenum rod, the spiral high-flow ultrahigh-temperature air electric heater further comprises a plug brick, the shape of each plug brick is matched with the shape of the corresponding stepped hole, and each plug brick is embedded in the corresponding stepped hole of the channel cover plate and used for installing a corresponding silicon-molybdenum rod clamp so as to replace the corresponding silicon-molybdenum rod.
Optionally, each flange joint is provided with a corresponding sealing gasket.
Optionally, a heat insulation layer is arranged between the spiral channel and the cylinder and is a fiber blanket and a heat insulation felt, and the fiber blanket and the heat insulation felt are wrapped between the spiral channel and the cylinder.
Optionally, each silicon-molybdenum rod is a U-shaped silicon-molybdenum rod.
The utility model provides a large-traffic super high-temperature air electric heater of spiral, for reaching at least 1650K's air temperature, choose the silicon molybdenum rod for use as resistance heating element, the silicon molybdenum rod component can work indeformable for a long time at 1800 ℃ stick temperature most and not fracture, is a good heating element who is applicable to the high temperature atmosphere. Tens of silicon-molybdenum rods are connected in series in the spiral channel to form a continuous heating device, air and the high-temperature silicon-molybdenum rods which are heated by electricity carry out heat convection, and the heat convection temperature of the air and the high-temperature channel wall heated by the radiation of the silicon-molybdenum rods is increased, so that the heater converts electric energy into air sensible heat with high thermal efficiency. The high-temperature air inlet device has the characteristics of simple structure, high space utilization rate, small thermal deformation of the channel, pure air after heating and high heating temperature, and can meet the high-temperature air inlet requirement of the ground verification test of the hypersonic aircraft.
The above and other objects, advantages and features of the present application will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, as illustrated in the accompanying drawings.
Drawings
Some specific embodiments of the present application will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily to scale. In the drawings:
FIG. 1 is a schematic front cross-sectional view of a spiral high flow ultra high temperature air electric heater according to one embodiment of the present application;
FIG. 2 is a schematic cross-sectional view taken along section line A-A in FIG. 1;
fig. 3 is a schematic cross-sectional view taken along a sectional line B-B in fig. 1.
The symbols in the drawings represent the following meanings:
1, sealing an end socket; 2-cooling gas outlet pipeline; 3-cylinder heat preservation felt; 4-a channel cover plate; 5-cylinder; 6-heat preservation felt; 7-fiber blanket; 8-a helical channel; 9-silicon molybdenum rod; 10-an air intake duct; 11-air inlet pipeline heat preservation felt; 12-inlet duct refractory cement layer; 13-an outlet duct; 14-air outlet pipeline heat preservation felt; 15-refractory cement layer of the gas outlet pipeline; 16-a thermal barrier coating layer; 17-a cooling gas inlet duct; 18-a first flange; 19-a first gasket; 20-plugging bricks; 21-a ceramic rod; 22-a second flange; 23-a second gasket; 24-lower end enclosure; 25-lower end socket heat preservation felt; 26-channel base.
Detailed Description
Fig. 1 is a schematic main sectional view of a spiral high flow ultra high temperature air electric heater according to one embodiment of the present application. Fig. 2 is a schematic cross-sectional view taken along a sectional line a-a in fig. 1. Fig. 3 is a schematic sectional view taken along a section line B-B in fig. 1. As shown in fig. 1, see also fig. 2-3. The embodiment provides a spiral high-flow ultrahigh-temperature air electric heater, which generally comprises: the device comprises an upper seal head 1, a cylinder 5, a first flange 18, a second flange 22, a lower seal head 24, a cooling gas inlet pipeline 17, a cooling gas outlet pipeline 2, a gas inlet pipeline 10, a gas outlet pipeline 13, a spiral channel 8, a plurality of silicon-molybdenum rods 9, a plurality of ceramic rods 21, a channel base 26 and a channel cover plate 4. Wherein, the upper end enclosure 1, the cylinder 5 and the lower end enclosure 24 are sequentially connected from top to bottom through flanges to jointly form a shell of the electric heater. More specifically, each flange connection is provided with a corresponding gasket. A first sealing gasket 19 is arranged at the joint of the first flange 18. A second sealing gasket 23 is arranged at the joint of the second flange 22. The cooling gas inlet pipeline 17 and the cooling gas outlet pipeline 2 are oppositely arranged at the upper sealing head 1 and are communicated with the inside of the upper sealing head 1. The air inlet pipe 10 and the air outlet pipe 13 are disposed at the lower head 24 and serve as an air inlet passage and an air outlet passage. Corresponding heat insulation layers are arranged in the air inlet pipeline 10 and the air outlet pipeline 13 so as to reduce heat loss. More specifically, the heat insulation layers arranged in the air inlet pipeline 10 are an air inlet pipeline heat insulation felt 11 and an air inlet pipeline refractory cement layer 12, and the air inlet pipeline heat insulation felt 11 and the air inlet pipeline refractory cement layer 12 are sequentially arranged along the direction from the inner wall of the air inlet channel to the channel. More specifically, the heat preservation layer arranged in the air outlet pipeline 13 is an air outlet pipeline heat preservation felt 14, an air outlet pipeline fire-resistant cement layer 15 and a heat insulation coating layer 16, and the air outlet pipeline heat preservation felt 14, the air outlet pipeline fire-resistant cement layer 15 and the heat insulation coating layer 16 are sequentially arranged along the direction from the inner wall of the air outlet pipeline 13 to the channel. The spiral channel 8 is formed by pouring high-temperature-resistant materials and performing layered pouring by using a foam mold, is arranged in the cylinder 5, and a heat-insulating layer is arranged between the spiral channel 8 and the cylinder 5. More specifically, the heat insulation layer arranged between the spiral channel 8 and the cylinder 5 is a fiber blanket 7 and a heat insulation felt 6, and the fiber blanket 7 and the heat insulation felt 6 are wrapped between the spiral channel 8 and the cylinder 5. More specifically, the spiral channel 8, the channel base 26 and the channel cover plate 4 are all made of corundum material by casting. A plurality of silicon-molybdenum rods 9 are sequentially arranged in series in the spiral channel 8 for heating. More specifically, each silicon-molybdenum rod 9 is a U-shaped silicon-molybdenum rod. Preferably, a plurality of silicon-molybdenum rods 9 may be arranged at equal intervals within the spiral channel 8. And a plurality of ceramic rods 21 are embedded in the spiral channel 8 side by side at the downstream position of each silicon-molybdenum rod 9 and used for enhancing the integral structural strength of the spiral channel 8 and blocking the silicon-molybdenum rods 9 from deforming at high temperature. The channel base 26 is formed on the inner wall of the lower end enclosure 24, is formed by pouring high-temperature-resistant materials and is used for supporting the spiral channel 8, and vent holes are formed in the channel base 26 at positions corresponding to the air inlet pipeline 10 and the air outlet pipeline 13 so as to communicate the air inlet pipeline 10 and the air outlet pipeline 13 with the spiral channel 8. More specifically, a low head heat preservation felt 25 is padded between the channel base 26 and the low head 24. The channel cover plate 4 is formed by pouring refractory castable, is arranged at the top of the cylinder 5, is used for gas sealing of the spiral channel 8, and is also used as a bearing structure of the silicon-molybdenum rods 9. More specifically, a cylinder insulation blanket 3 is padded between the channel cover plate 4 and the cylinder 5. Furthermore, stepped holes are formed in the channel cover plate 4 corresponding to the positions of the silicon-molybdenum rods 9, the spiral high-flow ultrahigh-temperature air electric heater further comprises plug bricks 20, the shape of each plug brick 20 is matched with the shape of the corresponding stepped hole, and each plug brick 20 is embedded in the corresponding stepped hole of the channel cover plate 4 and used for installing a corresponding silicon-molybdenum rod fixture so as to replace the corresponding silicon-molybdenum rods 9.
In this embodiment, as shown in fig. 1 and also referring to fig. 2 to 3, the air inlet duct 10 is configured to be a port through which low-temperature air enters the electric heater, and the air outlet duct 13 is configured to be a port through which heated air exits the electric heater. The inlet duct 10, the spiral channel 8 and the outlet duct 13 are configured to: the low-temperature air flows into the channel base 26 and the spiral channel 8 from the air inlet pipe 10, turns to flow inwards along the spiral line direction of the spiral channel 8 after flowing upwards and meeting the channel cover plate 4, and the air exchanges heat with the high-temperature silicon-molybdenum rod 9 heated by power on in a convection manner, and also exchanges heat with the high-temperature channel wall heated by radiation of the silicon-molybdenum rod 9 in a convection manner to increase the temperature, finally converges downwards at the tail end of the spiral channel 8, and flows out of the heater from the air outlet pipe 13 through the channel base 26. In this embodiment, the air flows from outside to inside along the spiral passage 8, and the inside temperature is high, and the outside temperature is low, which is favorable for the heat preservation design of the spiral passage 8.
In this embodiment, as shown in fig. 1, also referring to fig. 2 to 3, the cooling air inlet pipe 17 and the cooling air outlet pipe 2 are interfaces for allowing another cooling air slightly higher than the pressure of the heating air to enter and exit the electric heater, and are used for cooling the hot end of the silicon-molybdenum rod 9 and the electrical connector in the space formed by the channel cover plate 4 and the upper end enclosure 1.
The utility model provides a large-traffic super high-temperature air electric heater of spiral, for reaching at least 1650K's air temperature, chooses silicon molybdenum rod 9 for use as resistance heating element, and the highest can be at 1800 ℃ of rod temperature long-term work indeformable unbroken of silicon molybdenum rod 9 component, is a good heating element who is applicable to the high temperature atmosphere. Dozens of silicon-molybdenum rods 9 are connected in series in the spiral channel 8 to form a continuous heating device, air carries out convection heat exchange with the high-temperature silicon-molybdenum rods 9 which are heated by electricity, and simultaneously carries out convection heat exchange with the high-temperature channel wall heated by radiation of the silicon-molybdenum rods 9, and the temperature is raised to about 1400 ℃. The present application is a heater that converts electrical energy into sensible air heat with high thermal efficiency. The high-temperature air inlet device has the characteristics of simple structure, high space utilization rate, small thermal deformation of the channel, pure air after heating and high heating temperature, and can meet the high-temperature air inlet requirement of the ground verification test of the hypersonic aircraft.
In specific implementation, as shown in fig. 1 and also shown in fig. 2-3, the external shell of the electric heater is composed of an upper end enclosure 1, a cylinder 5, a lower end enclosure 24, a large flange 18, a large flange 22, a cooling air inlet pipeline 17, a cooling air outlet pipeline 2, an air inlet pipeline 10 and an air outlet pipeline 13.
The surface layer of the lower end enclosure 24 is padded with a heat preservation felt 25 with the thickness of 5mm, and then a channel base 26 is poured on the lower end enclosure by corundum pouring materials to play a role in supporting the spiral channel 8. The air inlet pipeline 10 and the air outlet pipeline 13 are respectively welded with the lower end enclosure 24 to form an air inlet and outlet channel. An air inlet pipeline heat preservation felt 11 with the thickness of 10mm is padded on the inner surface of the air inlet pipeline 10, and then a refractory cement layer 12 of the air inlet pipeline is formed through pouring, so that the heat preservation effect is achieved. The inner surface of the air outlet pipeline 13 is padded with an air outlet pipeline heat preservation felt 14 with the thickness of 10mm, then a fire-resistant cement layer 15 of the air outlet pipeline is formed by pouring, and then a high-temperature resistant heat insulation coating layer 16 is formed by coating to play a role in heat preservation.
The spiral channel 8 is formed by layered pouring of corundum pouring materials through a foam mold, the ceramic rods 21 are placed side by side at the downstream of the position of each silicon-molybdenum rod 9 in the pouring process, and after demolding, the two ends of each ceramic rod 21 are tightly embedded in the spiral channel 8 and used for enhancing the overall structural strength of the spiral channel 8 and preventing the silicon-molybdenum rods 9 from deforming at high temperature. 40U-shaped silicon-molybdenum rods 9 with the same size are connected in series and arranged in the spiral channel 8 at equal intervals, and the upper edge of the transition section of the silicon-molybdenum rods 9 is flush with the upper edge of the spiral channel 8. A fiber blanket 7 and a heat preservation felt 6 with the thickness of 10mm are tightly packed between the spiral channel 8 and the cylinder 5, so as to play a role in heat preservation.
The channel cover plate 4 is formed by pouring corundum castable and is used as a bearing structure of 40 silicon-molybdenum rods 9, a cylindrical heat preservation felt 3 with the thickness of 5mm is padded between the channel cover plate 4 and the cylinder 5, and contact lines between the channel cover plate 4 and the spiral channel 8 and between the spiral channel 8 and the channel base 26 are coated and sealed by a refractory cement layer. 40 stepped holes are prefabricated on the channel cover plate 4 during pouring, the stepped plug bricks 20 are embedded in the stepped holes and used for fixing the silicon-molybdenum rod clamp and the silicon-molybdenum rod 9, and the plug bricks 20 are made into stepped shapes so as to facilitate replacement of the silicon-molybdenum rod 9.
The electric heating element of the silicon-molybdenum rod 9 has small resistivity at low temperature and large resistivity at high temperature, so the heater provided by the invention has better economy when in a high-temperature working state.
Example 1
The high-flow high-pressure clean air with the mass flow of 0.15kg/s, the pressure of 0.5MPa and the temperature of 20 ℃ enters the upper space of the heater from a cooling air inlet pipeline 17 to cool the hot end of the silicon molybdenum rod 9 and an electrical connector, then flows out from a cooling air outlet pipeline 2, is heated in a primary heating system to be heated to 650 ℃, then flows into a channel base 26 and a spiral channel 8 from an air inlet pipeline 10 of a point heater, turns after encountering a channel cover plate 4 to flow inwards along the spiral line direction of the spiral channel 8, carries out heat convection on the air and the electrified and heated high-temperature silicon molybdenum rod 9, simultaneously carries out heat convection on the air and the high-temperature spiral channel wall heated by the silicon molybdenum rod 9 in a radiation manner, finally raises the temperature to 1400 ℃, converges at the tail end of the spiral channel 8 and flows downwards to flow out of the electric heater from an air outlet pipeline 13 through the channel base 26, and the total pressure loss of the air is not more than 5 kPa. The temperature of the outermost side wall of the spiral channel 8 is not more than 900 ℃ at most, and after the heat insulation effect of the fiber blanket 7 and the heat insulation felt 6 with the thickness of 10mm, the temperature of the outer wall of the cylinder 5 is not more than 100 ℃.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which this application belongs.
In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application.
Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present application, "a plurality" means two or more unless specifically defined otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
The above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a large-traffic superhigh temperature air electric heater of spiral, its characterized in that includes:
the upper end enclosure, the cylinder and the lower end enclosure are sequentially connected from top to bottom through flanges to form a shell of the electric heater together;
the cooling gas inlet pipeline and the cooling gas outlet pipeline are oppositely arranged at the upper end enclosure and are communicated with the interior of the upper end enclosure;
the air inlet pipeline and the air outlet pipeline are arranged at the lower end enclosure and are used as an air inlet channel and an air outlet channel, and corresponding heat insulation layers are arranged in the air inlet pipeline and the air outlet pipeline so as to reduce heat loss;
the spiral channel is formed by pouring high-temperature-resistant materials and is arranged in the cylinder, and a heat-insulating layer is arranged between the spiral channel and the cylinder;
a plurality of silicon-molybdenum rods which are sequentially arranged in series in the spiral channel and used for heating;
the ceramic rods are embedded in the spiral channel side by side and positioned at the downstream position of each silicon-molybdenum rod, and are used for enhancing the overall structural strength of the spiral channel and preventing the silicon-molybdenum rods from deforming at high temperature;
the channel base is formed on the inner wall of the lower end enclosure, is formed by pouring high-temperature-resistant materials and is used for supporting the spiral channel, and vent holes are formed in the channel base at positions corresponding to the air inlet pipeline and the air outlet pipeline so as to communicate the air inlet pipeline and the air outlet pipeline with the spiral channel; and
the channel cover plate is formed by pouring high-temperature-resistant material pouring materials, is arranged at the top of the cylinder, is used for gas sealing of the spiral channel, and is also used as a bearing structure of the silicon-molybdenum rods.
2. The spiral high flow ultra-high temperature air electric heater of claim 1, wherein the inlet duct is configured as an interface for low temperature air to enter the electric heater, the outlet duct is configured as an interface for heated air to exit the electric heater, and the inlet duct, the spiral channel, and the outlet duct are configured to: and low-temperature air flows into the channel base and the spiral channel from the air inlet pipeline, turns to flow inwards along the spiral line direction of the spiral channel after flowing upwards and meets the channel cover plate, and the air exchanges heat with the high-temperature silicon-molybdenum rod heated by power supply in a convection way, and also exchanges heat with the high-temperature channel wall heated by the radiation of the silicon-molybdenum rod in a convection way to increase the temperature, finally converges downwards at the tail end of the spiral channel and flows out of the heater from the air outlet pipeline through the channel base.
3. The spiral high-flow ultrahigh-temperature air electric heater according to claim 1, wherein the cooling air inlet pipe and the cooling air outlet pipe are interfaces for the inlet and outlet of other cold air slightly higher than the pressure of the heating air, and are used for cooling the hot end of the silicon-molybdenum rod and the electric connecting piece in a space formed by the channel cover plate and the upper end enclosure.
4. The spiral high-flow ultrahigh-temperature air electric heater according to claim 1, wherein the heat-insulating layer arranged in the air inlet pipeline is an air inlet pipeline heat-insulating felt and an air inlet pipeline refractory cement layer, and the air inlet pipeline heat-insulating felt and the air inlet pipeline refractory cement layer are sequentially arranged along the direction from the inner wall of the air inlet channel to the channel.
5. The spiral high-flow ultrahigh-temperature air electric heater according to claim 1, characterized in that the heat-insulating layer arranged in the outlet pipe is an outlet pipe heat-insulating felt, an outlet pipe refractory cement layer and a heat-insulating coating layer, and the outlet pipe heat-insulating felt, the outlet pipe refractory cement layer and the heat-insulating coating layer are sequentially arranged along the direction from the inner wall of the outlet pipe to the channel.
6. The spiral high-flow ultrahigh-temperature air electric heater according to claim 1, characterized in that the spiral channel, the channel base and the channel cover plate are all cast from corundum material.
7. The spiral high-flow ultrahigh-temperature air electric heater according to claim 1, characterized in that a lower head heat preservation felt is padded between the channel base and the lower head.
8. The spiral high flow UHT air electric heater of claim 1, wherein a cylinder insulation blanket is padded between the channel cover plate and the cylinder.
9. The spiral high-flow ultrahigh-temperature air electric heater according to claim 1, wherein stepped holes are formed in the channel cover plate at positions corresponding to the silicon-molybdenum rods, the spiral high-flow ultrahigh-temperature air electric heater further comprises plug bricks, the shape of each plug brick is matched with that of the corresponding stepped hole, and each plug brick is embedded in the corresponding stepped hole of the channel cover plate and used for installing a corresponding silicon-molybdenum rod clamp so as to facilitate replacement of the corresponding silicon-molybdenum rod.
10. The spiral high flow rate ultra high temperature air electric heater of any one of claims 1-9, wherein each flange connection is provided with a corresponding gasket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110644003.9A CN113432295B (en) | 2021-06-09 | 2021-06-09 | Spiral high-flow ultrahigh-temperature air electric heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110644003.9A CN113432295B (en) | 2021-06-09 | 2021-06-09 | Spiral high-flow ultrahigh-temperature air electric heater |
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| CN114636313B (en) * | 2022-02-23 | 2024-04-12 | 大连海事大学 | Heating and heat-preserving equipment for high-temperature pulsating heat pipe and design method thereof |
| CN115540341B (en) * | 2022-03-12 | 2023-09-08 | 无锡恒业电热电器有限公司 | High-temperature high-pressure air energy storage electric heater |
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