CN214198752U - Air heater with anti-freezing function - Google Patents
Air heater with anti-freezing function Download PDFInfo
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- CN214198752U CN214198752U CN202022559196.1U CN202022559196U CN214198752U CN 214198752 U CN214198752 U CN 214198752U CN 202022559196 U CN202022559196 U CN 202022559196U CN 214198752 U CN214198752 U CN 214198752U
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- heat exchange
- air heater
- collecting tank
- exchange tube
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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
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Abstract
The utility model discloses a fan heater that has function of preventing frostbite, including the frame and set up the collection case that intakes in the frame, go out water collection case and a plurality of single heat exchanger of organizing, wherein, each single heat exchanger of organizing all includes upper portion collection case, lower part collection case and a plurality of heat exchange tube, the vertical distribution of each heat exchange tube, the lower extreme and the lower part collection case of each heat exchange tube are linked together, the upper end and the upper portion collection case of each heat exchange tube are linked together, two front and back single upper portion collection cases and the lower part collection case of organizing in the heat exchanger are linked together through the contact pipe respectively, this fan heater has excellent frostproofing ability.
Description
Technical Field
The utility model belongs to the technical field of power plant boiler flue gas waste heat recovery, a fan heater that has function of preventing frostbite is related to.
Background
Along with implementation of comprehensive ultralow emission and promotion of energy-saving transformation work of a coal-fired power plant, a low-nitrogen combustion system, a flue gas denitration system, a wet desulphurization system, a wet electric dust collector system and the like are widely applied, and the systems meet the environmental protection standard and also have problems, such as reduction of boiler efficiency and reduction of electric dust collector efficiency caused by rise of smoke discharge temperature, blockage and resistance rise of an air preheater caused by rise of denitration ammonia escape rate, rise of water consumption of the wet desulphurization system, rise of plant power consumption and the like.
Because the low-temperature economizer system is beneficial to the ultralow emission reconstruction of a coal-fired power plant while recovering waste heat and saving energy, can be matched with the reconstruction of an electrostatic dust collector, improves the dust removal efficiency, reduces the cost of environmental protection reconstruction, and has better economic benefit, the low-temperature economizer system is rapidly developed and further optimized under the large background of ultralow emission and energy-saving reconstruction. The combined system of the low-temperature economizer and the air heater is based on the low-temperature economizer system, the air heater is used for improving the air temperature at the inlet of the air preheater, the resistance rise and blockage of the air preheater and the low-temperature economizer caused by the rise of the ammonia escape rate are relieved, and meanwhile, the boiler efficiency and the energy-saving benefit of the low-temperature economizer are improved.
When the hot water at the outlet of the low-temperature economizer is used as the heat source of the air heater, the water temperature at the inlet of the air heater is generally between 100 ℃ and 130 ℃, and the water temperature at the outlet of the air heater is generally controlled to be about 70 ℃; when the condensed water of the low-pressure heating system of the unit is used as a heat source of the air heater, the temperature of the water at the inlet of the air heater is generally between 80 and 100 ℃, and the temperature of the water at the outlet of the air heater is generally controlled to be between 40 ℃. The temperature of water at the outlet of the air heater in the low-temperature economizer and air heater combined system is low, when the environmental temperature is low and the unit runs at low load, the temperature of water at the outlet of the air heater is low, the flow is small, and in addition, the flow velocity among all the heat exchange tubes is uneven, so that the heat exchange tubes are easy to freeze and crack, and the condition that the air heater system cannot be put into operation threatens the system safety. The anti-freezing problem of the air heater seriously affects the application of the low-temperature economizer and the air heater system in northern areas.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a fan heater that has frostproofing function, this fan heater has excellent frostproofing ability.
In order to achieve the above purpose, the air heater with anti-freezing function of the present invention comprises a frame, and a water inlet header, a water outlet header and a plurality of single-group heat exchangers arranged in the frame, wherein each single-group heat exchanger comprises an upper header, a lower header and a plurality of heat exchange tubes, each heat exchange tube is vertically distributed, the lower end of each heat exchange tube is communicated with the lower header, the upper end of each heat exchange tube is communicated with the upper header, and the upper header in the previous single-group heat exchanger is communicated with the upper header in the next single-group heat exchanger through a connecting tube;
the lower header in the first single-group heat exchanger is used as a water inlet header of the air heater, and the lower header in the last single-group heat exchanger is used as a water outlet header of the air heater.
The side of the frame is provided with an air inlet and an air outlet.
All the heat exchange tubes in the same single group of heat exchangers are arranged in parallel.
An exhaust pipeline and a sewage discharge pipeline are arranged on a connecting pipe between the upper header and the lower header.
And manual stop valves are arranged on the exhaust pipeline and the sewage draining pipeline.
Adjacent heat exchange tubes are connected through the anti-vibration assemblies, and adjacent anti-vibration assemblies are connected through the detuning plates and the reinforcing tubes.
The heat exchange tube is an annular fin heat exchange tube.
The upper header is provided with a lifting lug.
The utility model discloses following beneficial effect has:
the fan heater that has function of preventing frostbite when concrete operation, the heat exchange tube is vertical to be arranged, the fan heater adopts the staggered arrangement, arranges against the current, the fan heater is flowed through to the mode of advancing down in the working medium adoption to vertical flow in the heat exchange tube, when avoiding conventional heat exchange tube level to arrange, the frost crack that leads to can't be put to the greatest extent to ponding in the heat exchange tube. The heat exchange tubes are directly connected with the upper header and the lower header without elbows, so that the number of weak positions of the heat exchange tubes is reduced, and the elbows of the heat exchange tubes are prevented from frost cracking. The upper header and the lower header in the adjacent single heat exchanger are connected through the connecting pipe, working medium flow is uniformly distributed, working medium flow deviation in each heat exchange pipe is enabled to fluctuate in a small range, and working medium flow velocity in the heat exchange pipes is improved. Simple structure, the operation is operated and is overhauld the maintenance work volume few, can alleviate the current situation that hot water fan heater heat exchange tube frequently freezes and splits in northern area, improves the ability of preventing frostbite of fan heater greatly.
Furthermore, an exhaust pipeline and a sewage discharge pipeline are arranged on the connecting pipe, an exhaust point and a sewage discharge point are respectively located at the highest position and the lowest position of the air heater, and working media in the upper header, the lower header and the heat exchange pipe can be exhausted when the air heater quits operation. The air heater is formed by connecting a plurality of single-group heat exchangers in series or in parallel, and the heat exchange tubes are connected through the anti-vibration assembly, so that the vibration of the air heater caused by the resonance when air flows through the heat exchange tubes is effectively avoided.
Drawings
FIG. 1 is a front view of a single heat exchanger unit 2 according to the present invention;
FIG. 2 is a side view of a single heat exchanger unit 2 according to the present invention;
FIG. 3 is a side view of a single heat exchanger unit 2 according to the present invention;
FIG. 4 is a top view of a single heat exchanger unit 2 according to the present invention;
fig. 5 is a layout view of the heat exchange tube 11 of the present invention;
fig. 6 is a connection diagram of the vibration-proof assembly of the present invention;
fig. 7 is a connection diagram of the middle header of the present invention.
Wherein, 1 is a vibration-proof component, 2 is a single group of heat exchangers, 3 is an upper header, 4 is a lower header, 5 is a detuning plate, 6 is a reinforcing pipe, 7 is a connecting pipe, 8 is an inlet header, 9 is an outlet header, 10 is a frame, 11 is a heat exchange pipe, 12 is a lifting lug, 13 is an exhaust pipeline, and 14 is a sewage discharge pipeline.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1 to 7, the air heater with an anti-freezing function of the present invention includes a frame 10, and an inlet header 8, an outlet header 9 and a plurality of single heat exchangers 2 disposed in the frame 10, wherein each single heat exchanger 2 includes an upper header 3, a lower header 4 and a plurality of heat exchange tubes 11, each heat exchange tube 11 is vertically disposed, a lower end of each heat exchange tube 11 is communicated with the lower header 4, an upper end of each heat exchange tube 11 is communicated with the upper header 3, and the upper header 3 of a previous single heat exchanger 2 is communicated with the upper header 4 of a next single heat exchanger 2 through a connecting tube 7; the lower header 4 in the first single-group heat exchanger 2 is used as a water inlet header 8 of the air heater, the lower header 4 in the last single-group heat exchanger 2 is used as a water outlet header 9 of the air heater, and an air inlet and an air outlet are arranged on the side surface of the frame 10.
All the heat exchange tubes 11 in the same single-group heat exchanger 2 are arranged in parallel; an exhaust pipeline 13 and a sewage discharge pipeline 14 are arranged on the connecting pipe 7 between the upper header 3 and the lower header 4, and manual stop valves are arranged on the exhaust pipeline 13 and the sewage discharge pipeline 14.
Adjacent heat exchange tubes 11 are connected through the anti-vibration assemblies 1, the adjacent anti-vibration assemblies 1 are connected through the detuning plate 5 and the reinforcing tube 6, the heat exchange tubes 11 are annular fin heat exchange tubes, and the upper header 3 is provided with the lifting lug 12.
Inlet and outlet dimensions of upper header 3 and lower header 4
Dimensions of the upper header 3 and the lower header 4
The number of the heat exchange tubes 11 in the single-group heat exchanger 2 is three, wherein the included angle α between the heat exchange tubes 11 on two sides and the central lines of the upper header 3 and the lower header 4 is 40 °, the height H between the starting positions of the annular fins of the heat exchange tubes 11 on two sides and the central line of the header is 185mm, and the height H between the starting positions of the elbows of the heat exchange tubes 11 on two sides and the starting positions of the annular fins of the heat exchange tubes 11 on two sides is 56 mm.
The connecting pipe 7 is made of a phi 76m steel pipe; the vibration isolation assembly 1 is in the form of a clamping plate made of a clamping plate material Q235B, the thickness δ is 6mm, the width B is 40mm, and two groups of clamping plates are connected by a steel plate with the thickness δ of 6 mm.
The detuning plate 5 is formed by splicing Q235B steel plates, the reinforcing pipe 6 is a phi 32 circular pipe, and the detuning plate 5 and the vibration-proof assembly 1 are firmly welded through spot welding.
The utility model discloses a concrete working process does:
in the air gets into the fan heater, utilize the medium heating air in the heat exchange tube 11, the fan heater staggered, arrange against the current, the air flows outside heat exchange tube 11, and the working medium gets into the fan heater by water inlet header 8, leaves the fan heater by water outlet header 9 again, and the vertical flow in heat exchange tube 11 of working medium avoids heat exchange tube 11 horizontal arrangement, and intraductal ponding can't be put to the greatest extent and the frost crack that leads to. Working medium is when flowing through upper portion collection case 3 and lower part collection case 4, because heat exchange tube 11 and upper portion collection case 3 and lower part collection case 4 lug connection do not set up the elbow, and connect through a plurality of tie pipes 7 between upper portion collection case 3 and the lower part collection case 4 to guarantee that distribution working medium flow is even, the heat exchange tube 11 frost crack that the fan heater has avoided leading to because the elbow is weak and working medium flow deviation in the operation process. The heat exchange pipes 11 are connected through the vibration-proof assembly 1, so that the vibration of the air heater caused by resonance when air flows through the heat exchange pipes 11 is effectively avoided. When the air heater is out of operation, working media in the heat exchange tube 11, the upper header 3 and the lower header 4 are prevented from being exhausted through the exhaust pipeline 13 and the sewage discharge pipeline 14, and the air heater has no water accumulation structure.
Claims (7)
1. A fan heater with an anti-freezing function is characterized by comprising a frame (10), a water inlet collecting tank (8), a water outlet collecting tank (9) and a plurality of single-group heat exchangers (2), wherein the water inlet collecting tank (8), the water outlet collecting tank (9) and the single-group heat exchangers (2) are arranged in the frame (10), each single-group heat exchanger (2) comprises an upper collecting tank (3), a lower collecting tank (4) and a plurality of heat exchange tubes (11), each heat exchange tube (11) is vertically distributed, the lower end of each heat exchange tube (11) is communicated with the lower collecting tank (4), the upper end of each heat exchange tube (11) is communicated with the upper collecting tank (3), the upper collecting tank (3) in the previous single-group heat exchanger (2) is communicated with the upper collecting tank (3) in the next single-group heat exchanger (2) through a connecting tube (7);
the lower header (4) in the first single-group heat exchanger (2) is used as a water inlet header (8) of the air heater, and the lower header (4) in the last single-group heat exchanger (2) is used as a water outlet header (9) of the air heater;
the side of the frame (10) is provided with an air inlet and an air outlet.
2. The air heater with antifreeze function of claim 1, wherein each heat exchange tube (11) in the same single group of heat exchangers (2) is arranged in parallel.
3. The air heater with the anti-freezing function as claimed in claim 1, wherein the connecting pipe (7) is provided with an exhaust pipe (13) and a sewage discharge pipe (14).
4. The air heater with the anti-freezing function according to claim 3, wherein the exhaust pipe (13) and the sewage discharge pipe (14) are provided with manual stop valves.
5. The air heater with the anti-freezing function according to claim 1, wherein adjacent heat exchange tubes (11) are connected by a vibration-proof unit (1), and adjacent vibration-proof units (1) are connected by a detuning plate (5) and a reinforcing tube (6).
6. The air heater with the antifreezing function as claimed in claim 1, wherein the heat exchange tube (11) is a ring fin heat exchange tube.
7. The air heater with antifreeze function of claim 1, wherein the upper header (3) is provided with a lifting lug (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022559196.1U CN214198752U (en) | 2020-11-06 | 2020-11-06 | Air heater with anti-freezing function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022559196.1U CN214198752U (en) | 2020-11-06 | 2020-11-06 | Air heater with anti-freezing function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214198752U true CN214198752U (en) | 2021-09-14 |
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ID=77644726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022559196.1U Active CN214198752U (en) | 2020-11-06 | 2020-11-06 | Air heater with anti-freezing function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214198752U (en) |
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2020
- 2020-11-06 CN CN202022559196.1U patent/CN214198752U/en active Active
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