CN102705865A - Boiler and air preheating system thereof - Google Patents
Boiler and air preheating system thereof Download PDFInfo
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- CN102705865A CN102705865A CN2012102042762A CN201210204276A CN102705865A CN 102705865 A CN102705865 A CN 102705865A CN 2012102042762 A CN2012102042762 A CN 2012102042762A CN 201210204276 A CN201210204276 A CN 201210204276A CN 102705865 A CN102705865 A CN 102705865A
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- heat pipe
- preheating system
- boiler
- air preheating
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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 invention discloses an air preheating system used for a boiler, which comprises an air preheater with a smoke outlet and an air inlet. The air preheating system also comprises a heat pipe exchanger with a gravity assisted heat pipe inside, and the gravity assisted heat pipe is filled with a liquid easy to vaporize. The cavity of the heat pipe exchanger is divided into a smoke channel and an air channel located above the smoke channel by a partition plate, and the smoke channel and the air channel are respectively connected with the smoke outlet and the air inlet of the air preheater. When high-temperature smoke enters the smoke channel of the heat pipe exchanger, the liquid in the pipe vaporizes to flow upwards so as to heat air flowing across the air channel. With the air preheating system provided by the invention, the residual heat of smoke is fully utilized, the exhaust smoke temperature is obviously lowered, and the heat efficiency of the boiler is increased. In addition, the invention also discloses a boiler comprising the air preheating system.
Description
Technical field
The present invention relates to the power technology field, particularly a kind of air preheating system that is used for boiler.In addition, the invention still further relates to a kind of boiler that comprises above-mentioned air preheating system.
Background technology
The heat loss that power plant's smoke evacuation causes is the major part of boiler heat loss; In order to improve the thermal efficiency of boiler; The general air preheater that all is provided with utilizes the flue gas of discharging once more, and certain temperature is arrived in the air preheat before the entering boiler, to improve the heat exchange performance of boiler.
At present, the design exhaust gas temperature of large-scale unit is generally at 120 ° of-130 ° of C, and the ubiquity exhaust gas temperature was higher than the phenomenon of design load when in fact power plant moved, and the flue-gas temperature of economizer exit entering air preheater is higher, causes higher thermal loss.
In theory, every low 10 ° of-15 ° of C of exhaust gas temperature, boiler efficiency just can improve about 1%, mainly reduces exhaust gas temperature through the heat transfer area that increases air preheater at present, improves the heat exchange performance of boiler, reduces energy loss; But reduce exhaust gas temperature certain restriction is arranged; When exhaust gas temperature is relatively lower, under the effect of air preheater, make the temperature of flue gas further reduce on the one hand with big heat transfer area; The temperature difference of flue gas and air also decreases; Even the heat transfer area of air preheater increases a lot, the heat transmission between flue gas and the air is less relatively, and the temperature drop of flue gas is reduced; On the other hand, when exhaust gas temperature was low, the tube wall temperature of air preheater might be lower than flue gas dew point; Cause tube wall generation cold end corrosion, in the service life of having reduced air preheater, use once changing once to 2 years at air preheater; If seriously corroded; Even work and just will change once half a year, seriously reduce boiler efficiency, and increased maintenance cost.
For this reason, can consider that the method for the heat transfer area of the increase air preheater that novel air preheating system is alternative traditional reduces the exhaust gas temperature and the heat loss of boiler, to improve boiler thermal output.
Summary of the invention
The purpose of this invention is to provide a kind of air preheating system that is used for boiler, this air preheating system can significantly reduce exhaust gas temperature, improves boiler thermal output.Another object of the present invention provides a kind of boiler that comprises above-mentioned air preheating system.
To achieve these goals; The present invention provides a kind of air preheating system that is used for boiler; Comprise air preheater with exhanst gas outlet and air intake; Said air preheating system comprises that also inside is equipped with the heat exchange of heat pipe of gravity assisted heat pipe; Be filled with the liquid that is prone to vaporization in the said gravity assisted heat pipe, the inner chamber of said heat exchange of heat pipe is divided into exhaust gases passes and the air duct that is positioned at said exhaust gases passes top by dividing plate, and said exhaust gases passes is connected with air intake with the exhanst gas outlet of said air preheater respectively with said air duct.
Preferably, said fin heat pipe is finned gravity assisted heat pipe.
Preferably, include diamond dust in the liquid in the said gravity fin heat pipe.
Preferably, said heat pipe is the carbon steel heat pipe, and in liquid, adds corrosion inhibiter.
Preferably, the external packets of said housing is wrapped with mineral wool.
Preferably, said air preheating system further comprises pressure fan, and said pressure fan is carried air to said heat exchange of heat pipe.
When the boiler operation, the high-temperature flue gas of being discharged by said boiler at first gets into said air preheater, with the air heat of the said air preheater of flowing through; The flue gas of temperature after reducing for the first time gets in the exhaust gases passes of the said heat exchange of heat pipe that is connected with said air preheater again; With the liquid heat in the said gravity assisted heat pipe and make it the vaporization; Flue gas release heat in this process, and the flue gas of the process temperature drop second time enters in the atmosphere through said exhaust gases passes; High-temperature steam flows to the top of gravity assisted heat pipe; Because the temperature of the shell of said gravity assisted heat pipe top is relatively low; Make the steam release heat in the pipe condense into drop, will be positioned at the flow through air heat of said air duct of said exhaust gases passes top simultaneously, after this drop is dirty along tube wall; Again got into the high-temperature flue gas heating vaporization of said exhaust gases passes, got into next heat cycles; Heated air gets into said air preheater in said heat exchange of heat pipe, the high-temperature flue gas post bake of the said air preheater that continues to be flowed through.Air preheating system provided by the present invention utilizes said gravity assisted heat pipe to realize the secondary preheating of flue gas to air, and the efficiency of heating surface is higher relatively, can significantly reduce exhaust gas temperature, improves boiler thermal output.
Description of drawings
Fig. 1 is the operation principle sketch map in a kind of specific embodiment of air preheating system provided by the present invention.
The specific embodiment
Core of the present invention provides a kind of air preheating system that is used for boiler, and this air preheating system can significantly reduce exhaust gas temperature, improves boiler thermal output.Another core of the present invention provides a kind of boiler that comprises above-mentioned air preheating system.
In order to make those skilled in the art person understand the present invention program better, the present invention is done further detailed description below in conjunction with the accompanying drawing and the specific embodiment.
Please refer to Fig. 1, Fig. 1 is the operation principle sketch map in a kind of specific embodiment of air preheating system provided by the present invention.
Air preheating system provided by the present invention comprises the air preheater 1 that is provided with exhanst gas outlet and air intake; The high-temperature flue gas that produces during the boiler operation is discharged by the exhanst gas outlet of air preheater 1; Exhanst gas outlet at air preheater 1 is connected with heat exchange of heat pipe 2; Heat exchange of heat pipe 2 comprises housing 203, in housing 203 set inside equally distributed gravity assisted heat pipe 201 is arranged, and in gravity assisted heat pipe 201, is filled with liquid; This liquid at high temperature is easy to vaporization, and concrete can be the liquid of water or other easy vaporizations; The inner flow passage of heat exchange of heat pipe 2 is divided into exhaust gases passes and air duct by dividing plate 202; And exhaust gases passes is positioned at the below of air duct; Simultaneously, exhaust gases passes is connected with the exhanst gas outlet of air preheater 1, and air duct is connected with the air intake of air preheater 1.
In order to carry air faster; Air preheating system provided by the present invention further comprises pressure fan 3; This pressure fan 3 can be arranged on around the heat exchange of heat pipe 2; The air duct of the straight opposite heat tube heat exchanger 2 of its air outlet slit is carried air to heat exchange of heat pipe 2, and air gets into air preheater 1 through air duct.
Thermal loss for the heat radiation that reduces housing 203 and outside air causes can be enclosed with mineral wool as insulation material in the outside of housing 203, improves the thermal efficiency.
Gravity assisted heat pipe 201 can adopt finned installation in heat exchange of heat pipe 2 inside; At exhaust gases passes and air duct fin is installed all; Help enlarging the heat transfer area of gravity assisted heat pipe and reduce the resistance that receives in the gas flow process, simultaneously, adopt finned installation can save the shared space of gravity assisted heat pipe; Increase the gas flow of circulation passage, increase the temperature drop of flue gas.
In order to reduce manufacturing cost; Gravity assisted heat pipe 201 can adopt the carbon steel heat pipe, but possibly have inconsistent problem between carbon steel and the liquid, especially between carbon steel and the water; Therefore can in advance the carbon steel heat pipe be carried out the preparatory Passivation Treatment of steam; Can also in liquid, add corrosion inhibiter, to reduce electrochemical reaction between liquid and the carbon steel, the service life of improving the carbon steel heat pipe.
Can also add particles of silicon carbide in the liquid in gravity assisted heat pipe 201, the working medium in the gravity assisted heat pipe 201 has three kinds of forms like this: solid, liquid, gas; As everyone knows, the thermal conductivity factor of solid material approximately than big two one magnitude of thermal conductivity factor of liquid, behind the adding diamond dust, can significantly improve the thermal conductivity factor of working medium in the heat pipe through the mutual collision between the diamond dust, thereby improve heat transfer efficiency in liquid.
But, the size of diamond dust there is certain requirement, diamond dust can not be too big, otherwise precipitate easily, can't form the steady suspension system; Simultaneously, diamond dust can not be too little, otherwise can increase processing cost, is difficult to apply.Generally speaking, can not increase substantially on the basis of manufacturing cost, have stable suspension in order to make the working medium in the heat pipe, the scope that requires the particle diameter of diamond dust is 8-10 μ m, and the mass fraction that its gross mass accounts for total working medium is about 5%.
When the boiler operation, the high-temperature flue gas of discharging via the boiler exhaust gas mouth at first gets into air preheater 1, and with the air heat of flowing through, the temperature of flue gas has obtained reduction to a certain degree in air preheater 1; The flue gas of temperature drop gets into the exhaust gases passes of heat exchange of heat pipe 2 through the exhanst gas outlet of air preheater 1 for the first time; Has the bigger temperature difference between the liquid in flue gas and gravity assisted heat pipe 201 and the gravity assisted heat pipe 201; Therefore, the flue gas release heat, heat is sent in tube wall and the liquid by flue gas; The temperature of liquid is elevated to a certain degree the back and vaporizes, and enters in the atmosphere through the flue gas of the temperature drop for the second time chimney by the exhaust gases passes entering boiler of heat exchange of heat pipe 2; After the heated liquid vaporization; Big pressure differential appears up and down in the pipe; High-temperature steam upwards flows under action of pressure, have the steam of higher temperature and the air of the air duct of the heat exchange of heat pipe 2 of flowing through between have the bigger temperature difference, heat by steam to air transfer; The air that obtains after the intensification to a certain degree gets into air preheaters 1 through heat exchange of heat pipe 2, and the high-temperature flue gas of the air preheater 1 that continues to be flowed through carries out second time and heats; The steam of the release heat formation drop that condenses flows back to the bottom of gravity assisted heat pipe again, and the high-temperature flue gas heating vaporization of the exhaust gases passes of being flowed through once more gets into next heat cycles then.
Air preheating system provided by the present invention has been realized the second use of flue gas and the post bake of air, made full use of the waste heat of flue gas, and the heat transfer efficiency of heat exchange of heat pipe is higher relatively; Can significantly reduce exhaust gas temperature, make full use of fume afterheat, improve boiler thermal output; Simultaneously, this air preheating system takes up space little, and is in light weight; Framework is simple, and low cost of manufacture is easy to apply.
Except above-mentioned air preheating system, the present invention also provides a kind of boiler that comprises above-mentioned air preheating system, and the economizer of boiler is connected with above-mentioned air preheating system, and the structure of other each several parts of this boiler please refer to prior art, and this paper repeats no more.
More than to air preheating system provided by the present invention and comprise that the boiler of this air preheating system has carried out detailed introduction.Used concrete example among this paper principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (7)
1. air preheating system that is used for boiler; Comprise air preheater with exhanst gas outlet and air intake; It is characterized in that; Said air preheating system comprises that also inside is equipped with the heat exchange of heat pipe of gravity assisted heat pipe; Be filled with the liquid that is prone to vaporization in the said gravity assisted heat pipe, the inner chamber of said heat exchange of heat pipe is divided into exhaust gases passes and the air duct that is positioned at said exhaust gases passes top by dividing plate, and said exhaust gases passes is connected with air intake with the exhanst gas outlet of said air preheater respectively with said air duct.
2. air preheating system according to claim 1 is characterized in that, said gravity assisted heat pipe is finned gravity assisted heat pipe.
3. air preheating system according to claim 2 is characterized in that, includes diamond dust in the liquid in the said finned gravity assisted heat pipe.
4. air preheating system according to claim 1 is characterized in that, said heat pipe is the carbon steel heat pipe, and in said liquid, adds corrosion inhibiter.
5. air preheating system according to claim 1 is characterized in that the external packets of said housing is wrapped with mineral wool.
6. air preheating system according to claim 1 is characterized in that said air preheating system further comprises pressure fan, and said pressure fan is carried air to said heat exchange of heat pipe.
7. a boiler comprises economizer, it is characterized in that, said economizer is connected with like any described air preheating system of claim 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102042762A CN102705865A (en) | 2012-06-15 | 2012-06-15 | Boiler and air preheating system thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102042762A CN102705865A (en) | 2012-06-15 | 2012-06-15 | Boiler and air preheating system thereof |
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| CN102705865A true CN102705865A (en) | 2012-10-03 |
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| CN2012102042762A Pending CN102705865A (en) | 2012-06-15 | 2012-06-15 | Boiler and air preheating system thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113432303A (en) * | 2021-07-20 | 2021-09-24 | 田国涛 | Multiphase flow heat exchange ultra-low nitrogen emission boiler |
Citations (8)
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| GB2076134A (en) * | 1980-03-31 | 1981-11-25 | Foster Wheeler Power Prod | Combustion air preheater |
| CN2151433Y (en) * | 1993-03-12 | 1993-12-29 | 罗赞继 | Effective heatpipe assembly for transmitting low density of heat energy |
| CN2334005Y (en) * | 1998-07-08 | 1999-08-18 | 重庆大学 | Assembly regenerable steel-water hot-pipe heat exchanger |
| CN201028791Y (en) * | 2007-04-06 | 2008-02-27 | 张志宇 | Anti-corrosion energy-saving boiler flue gas residual heat utilization device |
| 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 |
| CN201973697U (en) * | 2011-01-21 | 2011-09-14 | 上海康洪精密机械有限公司 | System capable of generating low-pressure steam by utilizing flue gas afterheat |
| CN102384684A (en) * | 2011-09-09 | 2012-03-21 | 长春当代信息产业集团有限公司 | Gas-gas type heat exchanger capable of resisting low temperature corrosion |
| CN202630104U (en) * | 2012-06-15 | 2012-12-26 | 黄绍新 | Boiler and air preheating system thereof |
-
2012
- 2012-06-15 CN CN2012102042762A patent/CN102705865A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2076134A (en) * | 1980-03-31 | 1981-11-25 | Foster Wheeler Power Prod | Combustion air preheater |
| CN2151433Y (en) * | 1993-03-12 | 1993-12-29 | 罗赞继 | Effective heatpipe assembly for transmitting low density of heat energy |
| CN2334005Y (en) * | 1998-07-08 | 1999-08-18 | 重庆大学 | Assembly regenerable steel-water hot-pipe heat exchanger |
| CN201028791Y (en) * | 2007-04-06 | 2008-02-27 | 张志宇 | Anti-corrosion energy-saving boiler flue gas residual heat utilization device |
| 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 |
| CN201973697U (en) * | 2011-01-21 | 2011-09-14 | 上海康洪精密机械有限公司 | System capable of generating low-pressure steam by utilizing flue gas afterheat |
| CN102384684A (en) * | 2011-09-09 | 2012-03-21 | 长春当代信息产业集团有限公司 | Gas-gas type heat exchanger capable of resisting low temperature corrosion |
| CN202630104U (en) * | 2012-06-15 | 2012-12-26 | 黄绍新 | Boiler and air preheating system thereof |
Non-Patent Citations (1)
| Title |
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| 方书起，赵凌: "三相工质重力热管强化传热试验研究", 《石油机械》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113432303A (en) * | 2021-07-20 | 2021-09-24 | 田国涛 | Multiphase flow heat exchange ultra-low nitrogen emission boiler |
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Application publication date: 20121003 |