CN102384684A - Gas-gas type heat exchanger capable of resisting low temperature corrosion - Google Patents
Gas-gas type heat exchanger capable of resisting low temperature corrosion Download PDFInfo
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- CN102384684A CN102384684A CN2011102674503A CN201110267450A CN102384684A CN 102384684 A CN102384684 A CN 102384684A CN 2011102674503 A CN2011102674503 A CN 2011102674503A CN 201110267450 A CN201110267450 A CN 201110267450A CN 102384684 A CN102384684 A CN 102384684A
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Abstract
The invention discloses a gas-gas type heat exchanger capable of resisting low temperature corrosion, which comprises a cooling section shell, a heating section shell and a separating plate. The cooling section shell and the heating section shell are vertically connected to form an integral body and separated from the middle through the separating plate. The heating section shell is located below the cooling section shell, a smoke inlet and a smoke outlet are arranged on the heating section shell, and an air inlet and an air outlet are arranged on the cooling section shell. At least one heat pipe is arranged on the separating plate and composed of a heat pipe cooling section and a heat pipe heating section, and fins are arranged on the heat pipe surfaces of both the heat pipe cooling section and the heat pipe heating section. The surfaces of the heat pipe heating section and the fins are all sintered with an enamel layer. The gas-gas type heat exchanger uses characteristics of acid and corrosion resistance of an enamel material, overcomes shortcoming of low temperature corrosion of a heat exchanging face in the existing boiler smoke waste heat recovery, has the characteristics of being wear-resisting and not easy to stick to ash, and can be used in heat transfer of hot fluid containing sulfur and ash.
Description
Technical field
The present invention relates to the field of heat exchangers that low-temperature flue gas reclaims, be specifically related to a kind of air-air type heat exchanger of low temperature resistant corrosion.
Background technology
In the flue gas waste heat recovery of boiler and industrial furnace, generally adopt air preheater to improve the thermal efficiency of thermal hardware.Air preheater is a kind of heat exchanger that typically utilizes hot fluid flue gas heating cold fluid air.Extensive use at present has carbon steel pipe air-air type heat exchanger.
But the heat exchanger of prior art life-span in fire coal, oil burning boiler or the waste heat recovery of industrial furnace low-temperature flue gas is very short, even the several months will scrap.Trace it to its cause is because of all containing sulphur content in fire coal, the fuel oil; Sulphur in the fuel can produce sulfur dioxide after burning; Part sulfur dioxide can generate sulfur trioxide with the reaction of oxygen in the combustion product, when sulfur trioxide combines with steam in the flue gas and can generate sulfuric acid vapor.
If the heat-transfer surface in the flue gas is lower than acid dew-point temperature, the sulfuric acid vapor in the flue gas can condense into liquid on heat-transfer surface at this moment, causes the heavy corrosion of carbon steel heat-transfer pipe.The sulfate liquid that condenses in addition on the heat-transfer surface also adheres to the flying dust in the flue gas easily, causes the obstruction of heat-transfer pipe.Acid corrosion and the stifled interaction of ash, the cause air preheater lost efficacy very soon, had a strong impact on the economic security operation of boiler or industrial furnace.
At present, though some air preheaters occurred,,, fail to apply owing to these heat exchangers are prone to broken, reason such as cost an arm and a leg such as glass pipe heat exchanger, acid-resistant stainless steel pipe heat exchanger etc.
It is thus clear that current under the situation of energy-saving and emission-reduction, exploitation is applicable to that the air-air type heat transfer equipment of low-temperature flue gas waste heat recovery is of great importance.
Summary of the invention
The objective of the invention is to, a kind of air-air type heat exchanger of low temperature resistant corrosion is provided, can overcome the cold end corrosion problem that exists in present boiler and the industrial furnace flue gas waste heat recovery, have acidproof, wear-resisting, be difficult for the characteristics that dust stratification, life-span are long, be easy to apply.
Technical scheme of the present invention is following:
A kind of air-air type heat exchanger of low temperature resistant corrosion comprises cooling section housing, bringing-up section housing and dividing plate, and said cooling section housing, bringing-up section housing fuse up and down, and passes through said dividing plate from spaced intermediate; Said bringing-up section housing is positioned at the below of cooling section housing, and wherein, said bringing-up section housing is provided with smoke inlet and exhanst gas outlet, and said cooling section housing is provided with air intake and air outlet slit; Said dividing plate is provided with at least one heat pipe, and said heat pipe is made up of heat pipe cooling section and heat pipe bringing-up section, and the heat pipe surface of said heat pipe cooling section and heat pipe bringing-up section is provided with fin; There is enamel layer on the surface of said heat pipe bringing-up section and fin thereof all sintering.
The air-air type heat exchanger of described low temperature resistant corrosion, wherein, close-fitting has the heat pipe sealing ring between heat pipe outer wall and dividing plate.
The air-air type heat exchanger of described low temperature resistant corrosion, wherein, the bottom surface of said heat pipe sealing ring is provided with the acidproof packing ring that tightly is enclosed within on the heat pipe outer wall.
The air-air type heat exchanger of described low temperature resistant corrosion, wherein, said fin is spaced along the axially parallel of heat pipe and is arranged on the heat pipe surface ringwise.
The air-air type heat exchanger of described low temperature resistant corrosion, wherein, the coated on bottom side of said dividing plate is covered with the acid resistant adhesive mortar layer.
The air-air type heat exchanger of described low temperature resistant corrosion wherein, is coated with the acid resistant adhesive mortar layer on the diapire of bringing-up section housing.
The air-air type heat exchanger of described low temperature resistant corrosion wherein, is coated with the acid resistant adhesive mortar layer on the inwall of bringing-up section housing.
The air-air type heat exchanger of described low temperature resistant corrosion wherein, is provided with the leakage fluid dram that is used to discharge acid solution in the bottom of bringing-up section housing.
The air-air type heat exchanger of a kind of low temperature resistant corrosion provided by the present invention has adopted hot pipe technique to make heat transfer efficiency height, the flow resistance of heat exchanger little; Owing to the smooth enamel layer of one deck is being arranged with contacted heat pipe of sulfur-containing smoke gas and fin surface sintering thereof; Utilize the characteristic of enamel material acid corrosion-resistant; Overcome the cold end corrosion heat-transfer surface problem that present residual heat from boiler fume exists in reclaiming, and had wear-resisting and be difficult for the characteristic of sticking ash, can be used for sulfur-bearing contain ash the heat transmission of hot fluid; The low temperature exhaust heat that is specially adapted to boiler and industrial furnace reclaims; Its effects of energy saving and emission reduction is good, the life-span is long, and its effects of energy saving and emission reduction is obvious, under the situation of current energy-saving and emission-reduction, has great practice significance.
Description of drawings
Fig. 1 is the internal structure schematic diagram of the air-air type heat exchanger of low temperature resistant corrosion provided by the invention.
The specific embodiment
Below will combine accompanying drawing, specific embodiments of the invention and embodiment specify, and described specific embodiment in order to explain the present invention, is not to be used to limit the specific embodiment of the present invention only.
See also Fig. 1; The air-air type heat exchanger of a kind of low temperature resistant corrosion of the present invention comprises cooling section housing 10, bringing-up section housing 20 and dividing plate 30; Said cooling section housing 10, bringing-up section housing 20 fuse up and down; Bringing-up section housing 20 is positioned at the below of cooling section housing 10, is provided with a dividing plate 30 in cooling section housing 10 and bringing-up section housing 20 intermediate lateral, is used for the inner space of cooling section housing 10 and the inner space of bringing-up section housing 20 are kept apart each other.Said bringing-up section housing 20 is provided with smoke inlet 21 and exhanst gas outlet 22, and said cooling section housing 10 is provided with air intake 11 and air outlet slit 12.
In the embodiment of the invention, dividing plate 30 is provided with at least one heat pipe, one whole siphunculus that said heat pipe is made up of heat pipe cooling section 41 and heat pipe bringing-up section 42, but inside heat pipe is provided with the working medium of gas-liquid conversion.And the heat pipe surface of heat pipe cooling section 41 and heat pipe bringing-up section 42 is provided with fin 43,44.Said fin 43,44 and is spaced setting along the axially parallel of heat pipe ringwise.
In the present embodiment, all sintering has the smooth enamel layer of one deck on the surface of said heat pipe bringing-up section 42 and fin 44 thereof.Because enamel layer is that sintering is lip-deep on heat pipe bringing-up section 42 surfaces and fin 44 thereof, therefore except having corrosion resistant characteristics, this enamel layer also has the characteristics of the solid difficult drop-off of strong adhesion.
In the specific implementation, said heat pipe is many, and the parallel interval arrangement is pencil or in-line arrangement between each heat pipe, perhaps wrong row.Said fin 43,44 axially parallels along heat pipe are spaced and are arranged on the heat pipe surface; Said fin 43,44 has improved the heat transfer area of air-air type heat exchanger greatly; And on heat pipe cooling section 41 and heat pipe bringing-up section 42, fin 43,44 is set all, has strengthened heat transfer property.
Concrete, be provided with smoke inlet 21 in a side of bringing-up section housing 20, be used to be communicated with the flue gas input channel, to import the flue gas that the waste gas that produces after fire coal, the oil inflame is sulfur-bearing, the bore of smoke inlet 21 should not be too little, to avoid the flow of flue gas resistance excessive; The higher sulfur-containing smoke gas of temperature is through bringing-up section housing 20 inner spaces the time; Carry out heat exchange with heat pipe bringing-up section 42 and fin 44, become the steam condition ascension by liquid condition after the liquid phase working fluid heat absorption in this heat pipe bringing-up section 42 and enter into the heat pipe cooling section 41 that is arranged in cooling section housing 10 parts; Opposite side at bringing-up section housing 20 is provided with exhanst gas outlet 22, and this exhanst gas outlet 22 is oppositely arranged with smoke inlet 21, is used to connect the flue gas output channel, with the lower flue gas of temperature after the process heat exchange in the output bringing-up section housing 20.
Side at cooling section housing 10 is provided with air intake 11, is used to introduce the air of needs heating, is provided with air outlet slit 12 at the opposite side of cooling section housing 10 a relative side of exhanst gas outlet 22 (promptly with), is used to connect warm-air pipe.In the specific implementation, the lower air of temperature gets in the cooling section housings 10 from air intake 11, carries out heat conduction the becoming higher air of temperature with the higher fluid media (medium) of temperature in the heat pipe cooling section 41 in the cooling section housing 10; Enter into the operation cycle that the heat pipe bringing-up section 42 that is arranged in bringing-up section housing 20 parts is accomplished a heat transfer and become liquid condition by steam condition after the working medium heat release in this heat pipe cooling section 41 by gravity reflux; Meanwhile; Air through heat exchange is exported from air outlet slit 12, gets into warm-air pipe.
In the preferred implementation of air-air type heat exchanger of the present invention, can be arranged between 0.1 ~ 0.8mm being positioned at the enamel layer thickness range that inner heat pipe bringing-up section 42 of bringing-up section housing 20 and fin 44 surperficial sintering thereof form.When the enamel layer thickness that goes out when sintering is too thin,, after expanding with heat and contract with cold repeatedly, is prone to crackle even comes off though can make the heat transfer efficiency loss of heat pipe bringing-up section 42 less; And the enamel layer thickness that sintering goes out is when too thick, although be not prone to crackle even come off, but greatly reduces the heat transfer property of heat pipe bringing-up section 42; Preferably, the enamel layer thickness that sintering goes out is 0.4 ± 0.1mm, so neither is prone to be full of cracks, also can not make the too many heat output of heat pipe bringing-up section 42 losses.And, show that through practical test result the smooth enamel layer of 0.4mm thickness only makes the heat pipe of its covering reduce about 5% heat output.
In the embodiment of the invention, said air intake 11 adopts relative direction setting with smoke inlet 21, makes the flow direction of flue gas and air opposite, has further improved the heat transference efficiency of air-air type heat exchange.Certainly, in other embodiments, air intake 11 and smoke inlet 21 can also be arranged on the same side of heat exchanger, make flowing to of flue gas and air identical.
Please continue to consult Fig. 1, close-fitting has heat pipe sealing ring 45 between the outer wall of heat pipe and dividing plate 30, and this heat pipe sealing ring 45 is positioned at a side of cooling section housing 10, is used for seal cooling section housing 10 and bringing-up section housing 20; The bottom surface of heat pipe sealing ring 45 is provided with acidproof packing ring 46.Particularly, said acidproof packing ring 46 is embedded in the middle of the dividing plate 30, is used to prevent that sulfuric acid vapors in the bringing-up section housing 20 from condensing in heat pipe sealing ring 45 places and the corrosion that causes.Wherein, said acidproof packing ring 46 preferred acid corrosion-resistant performances polytetrafluoroethylene gasket preferably.
Further, the bottom surface of dividing plate 30 (promptly being positioned at the part of bringing-up section housing 20) is coated with one deck acid resistant adhesive mortar layer 50, is used to prevent that sulfuric acid vapors in the bringing-up section housing 20 from condensing in dividing plate 30 surfaces and the corrosion that causes.On the diapire of bringing-up section housing 20, also be coated with one deck acid resistant adhesive mortar layer 50; Perhaps, on the inwall of whole bringing-up section housing 20, all be coated with one deck acid resistant adhesive mortar layer 50, can be used for all preventing that sulfuric acid vapors in the cooling section housing 10 from condensing in bringing-up section housing 20 surfaces and the corrosion that causes.
In the embodiment of the invention; Only carry out enamel with fin 44 and handle, and adopt the coating acid resistant adhesive mortar to handle, can improve whole acidproof degree at bringing-up section housing 20 inwalls or diapire in bringing-up section housing 20 inner heat pipe bringing-up sections 42; Also realize easily on the technology, and cost is low, cost is low.
Preferably, the thickness range of acid resistant adhesive mortar layer 50 can be arranged between 20 ~ 40mm, preferred 30mm.Then do not have etch-proof effect if the thickness of acid resistant adhesive mortar layer 50 is too thin, if the too thick inner space that then dwindles bringing-up section housing 20 of thickness of acid resistant adhesive mortar layer 50.
In addition, if adopt the coating acid resistant adhesive mortar at heat pipe bringing-up section 42 and fin 44 outer surfaces, because of the 30mm thickness of acid resistant adhesive mortar is thicker, the 0.4mm thickness of the enamel layer of comparing, acid resistant adhesive mortar layer 50 has influenced the heat conductivility of heat pipe, and also comes off easily.Be used for anticorrosively and apply acid resistant adhesive mortar in heat pipe sealing ring 45 bottoms, compare and adopt acidproof polytetrafluoroethylene gasket, then polytetrafluoroethylene gasket also has withstand voltage function.
Further, be provided with the leakage fluid dram 13 that is used to discharge acid solution in the bottom of bringing-up section housing 20.When the temperature of sulfur-containing smoke gas is lower than acid dew point; Sulfur-containing smoke gas will condense and gather the formation acid solution; Therefore adopt leakage fluid dram 13 can acid solution be got rid of, this also is a measure that improves corrosion resistance, can be used for various recuperation of heat or the heat exchange occasions that contain corrosive gas.
With the waste heat recovery of a 75t/h station boiler tail flue gas is example, adopts air-air type heat exchanger of the present invention as air preheater, as shown in Figure 1; Be provided with 420 heat pipes in the air-air type heat exchanger, wherein, the heat pipe external diameter is 38mm; The length of heat pipe bringing-up section 42 is 2200mm; The length of heat pipe cooling section 41 is 1600mm, and fin 43,44 highly is 19mm ringwise; Sintering is provided with 0.4mm at the thickness of heat pipe bringing-up section 42 and fin 44 enameling layers thereof; Heat exchanger median septum 30 bottoms and the thick acid resistant adhesive mortar layer 50 of fume side bringing-up section housing 20 internal coat 30mm.
The flue gas flow of boiler is 78592Nm3/h; The smoke inlet temperature of air-air type heat exchanger is 130 ℃; The exhanst gas outlet temperature is 100 ℃; Air intake 11 temperature are 20 ℃; Air outlet slit 12 temperature are 56 ℃, can know that through converting the waste heat recovery amount is 830KW.
Compare with air-air type heat exchanger of the prior art, adopted hot pipe technique to make heat transfer efficiency height, the flow resistance of heat exchanger little; Owing to the smooth enamel layer of one deck is being arranged with contacted heat pipe of sulfur-containing smoke gas and fin surface sintering thereof; Utilize the characteristic of enamel material acid corrosion-resistant; Overcome the cold end corrosion heat-transfer surface problem that exists in the present residual heat from boiler fume recovery, and had wear-resisting and difficult sticking grey characteristic, can be used for the heat transmission that sulfur-bearing contains the hot fluid of ash; The low temperature exhaust heat that is specially adapted to boiler and industrial furnace reclaims; Its effects of energy saving and emission reduction is good, the life-span is long, and its effects of energy saving and emission reduction is obvious, under the situation of current energy-saving and emission-reduction, has great practice significance.
Should be understood that; The above is merely preferred embodiment of the present invention, is not sufficient to limit technical scheme of the present invention, concerning those of ordinary skills; Within spirit of the present invention and principle; Can increase and decrease according to above-mentioned explanation, replacement, conversion or improvement, and all these increases and decreases, replacement, conversion or improve after technical scheme, all should belong to the protection domain of accompanying claims of the present invention.
Claims (8)
1. the air-air type heat exchanger of a low temperature resistant corrosion comprises cooling section housing, bringing-up section housing and dividing plate, and said cooling section housing, bringing-up section housing fuse up and down, and passes through said dividing plate from spaced intermediate; Said bringing-up section housing is positioned at the below of cooling section housing, it is characterized in that, said bringing-up section housing is provided with smoke inlet and exhanst gas outlet, and said cooling section housing is provided with air intake and air outlet slit; Said dividing plate is provided with at least one heat pipe, and said heat pipe is made up of heat pipe cooling section and heat pipe bringing-up section, and the heat pipe surface of said heat pipe cooling section and heat pipe bringing-up section is provided with fin; There is enamel layer on the surface of said heat pipe bringing-up section and fin thereof all sintering.
2. the air-air type heat exchanger of low temperature resistant corrosion according to claim 1 is characterized in that, close-fitting has the heat pipe sealing ring between heat pipe outer wall and dividing plate.
3. the air-air type heat exchanger of low temperature resistant corrosion according to claim 2 is characterized in that, the bottom surface of said heat pipe sealing ring is provided with the acidproof packing ring that tightly is enclosed within on the heat pipe outer wall.
4. the air-air type heat exchanger of low temperature resistant corrosion according to claim 1 is characterized in that, said fin is spaced along the axially parallel of heat pipe and is arranged on the heat pipe surface ringwise.
5. the air-air type heat exchanger of low temperature resistant corrosion according to claim 1 is characterized in that, the coated on bottom side of said dividing plate is covered with the acid resistant adhesive mortar layer.
6. the air-air type heat exchanger of low temperature resistant corrosion according to claim 5 is characterized in that, on the diapire of bringing-up section housing, is coated with the acid resistant adhesive mortar layer.
7. the air-air type heat exchanger of low temperature resistant corrosion according to claim 5 is characterized in that, on the inwall of bringing-up section housing, is coated with the acid resistant adhesive mortar layer.
8. according to the air-air type heat exchanger of any described low temperature resistant corrosion in the claim 1 to 7, it is characterized in that, be provided with the leakage fluid dram that is used to discharge acid solution in the bottom of bringing-up section housing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102674503A CN102384684A (en) | 2011-09-09 | 2011-09-09 | Gas-gas type heat exchanger capable of resisting low temperature corrosion |
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| CN2011102674503A CN102384684A (en) | 2011-09-09 | 2011-09-09 | Gas-gas type heat exchanger capable of resisting low temperature corrosion |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705865A (en) * | 2012-06-15 | 2012-10-03 | 黄绍新 | Boiler and air preheating system thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2225601Y (en) * | 1995-06-05 | 1996-04-24 | 山东辛店发电厂 | Enamel tube preheater |
| CN2757083Y (en) * | 2004-06-12 | 2006-02-08 | 辽宁石油化工大学 | Heat pipe air preheater |
| CN2872277Y (en) * | 2006-01-26 | 2007-02-21 | 江苏中天能源设备有限公司 | Separated hot-pipe heat exchanger |
| CN201059900Y (en) * | 2007-06-29 | 2008-05-14 | 北京建筑工程学院 | Combination type hot pipe flue gas condensation energy conservation equipment |
| CN201104155Y (en) * | 2007-08-28 | 2008-08-20 | 南京圣诺热管有限公司 | Corrosion resistant enamel heat pipe |
| CN201306959Y (en) * | 2008-09-28 | 2009-09-09 | 南京圣诺热管有限公司 | Hot-tube heat exchanger for low-temperature fume heat recovery of petrochemical atmospheric vacuum unit |
| CN201828176U (en) * | 2010-08-25 | 2011-05-11 | 中国石油化工股份有限公司 | Heat pipe and heat pipe air preheater |
-
2011
- 2011-09-09 CN CN2011102674503A patent/CN102384684A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2225601Y (en) * | 1995-06-05 | 1996-04-24 | 山东辛店发电厂 | Enamel tube preheater |
| CN2757083Y (en) * | 2004-06-12 | 2006-02-08 | 辽宁石油化工大学 | Heat pipe air preheater |
| CN2872277Y (en) * | 2006-01-26 | 2007-02-21 | 江苏中天能源设备有限公司 | Separated hot-pipe heat exchanger |
| CN201059900Y (en) * | 2007-06-29 | 2008-05-14 | 北京建筑工程学院 | Combination type hot pipe flue gas condensation energy conservation equipment |
| CN201104155Y (en) * | 2007-08-28 | 2008-08-20 | 南京圣诺热管有限公司 | Corrosion resistant enamel heat pipe |
| CN201306959Y (en) * | 2008-09-28 | 2009-09-09 | 南京圣诺热管有限公司 | Hot-tube heat exchanger for low-temperature fume heat recovery of petrochemical atmospheric vacuum unit |
| CN201828176U (en) * | 2010-08-25 | 2011-05-11 | 中国石油化工股份有限公司 | Heat pipe and heat pipe air preheater |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705865A (en) * | 2012-06-15 | 2012-10-03 | 黄绍新 | Boiler and air preheating system thereof |
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Application publication date: 20120321 |