CN2630667Y - Adjustable air preheater - Google Patents
Adjustable air preheater Download PDFInfo
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- CN2630667Y CN2630667Y CNU032553056U CN03255305U CN2630667Y CN 2630667 Y CN2630667 Y CN 2630667Y CN U032553056 U CNU032553056 U CN U032553056U CN 03255305 U CN03255305 U CN 03255305U CN 2630667 Y CN2630667 Y CN 2630667Y
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- control valve
- type heat
- heat exchange
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- temperature
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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 provides an adjustable type air pre-heater, which includes a heat transfer medium transportation unit, the heat transfer medium transportation unit includes a transportation pump, a first adjustment valve and a second adjustment valve; a heat exchange unit which includes an axial direction heat pipe element at the high temperature segment of the flue gas channel and the air channel; a jacket type heat pipe element at the low temperature segment of the flue gas channel, the input port of the jacket type heat pipe element is connected with the export of the transportation pump by the second regulation valve; the fin pipe type heat exchange element at the low temperature segment of the air channel is provided with an input port and an output port respectively connected with the output port of the jacket type heat pipe element and the inlet of the transportation pump, and the first adjustment valve is connected between the input port and output port of the fin pipe type heat exchange element. The adjustable type air pre-heater can adjust the heat exchange ability at a quite wide scope by the first and the second adjustment valve and the valves arranged inside the jacket type heat pipe element and the fin pipe type heat exchange element, and the utility model still can keep the pipe wall temperature of the low temperature segment above the acid dew point when the flue gas temperature is lower.
Description
Technical field
The utility model relates to heat-exchange apparatus, the air preheater that particularly a kind of heat-exchange capacity can be done to regulate.
Background technology
As a kind of heat-exchange apparatus, heat-pipe air preheater has obtained using widely at petrochemical industry, metallurgy industry owing to its good performance.In common heat-pipe air preheater, the general axial heat pipe element that adopts is as heat-exchanging part, these parts are positioned at the zone absorption flue gas liberated heat that smoke entrance is taken over, then with heat delivery to being positioned at the zone that air ports is taken over, thereby at last by the heat transferred air having been realized the exchange heat between flue gas and the air.
But there is following fatal shortcoming in above-mentioned heat-pipe air preheater.At first, when exhaust gas temperature is low (for example less than 180 ℃), the tube wall temperature that heat pipe is positioned at smoke outlet is easy to be lower than the dew-point temperature of flue gas, causes the serious low temperature acid dew piont corrosion of heat pipe.Next is the ability that adapts to cigarette, airload variation, particularly, when load is big, heat-pipe air preheater can not be effectively from the smoke absorption more heat, and when load hour, the tube wall temperature that heat pipe is positioned at smoke outlet enters low temperature dew point district again especially easily, causes serious low temperature acid dew piont corrosion.Therefore, this heat-pipe air preheater is shorter the service life under adverse circumstances, and application example shows, will change heat-pipe elements in general 2～3 years, and maintenance cost is higher.At last, since very high attached to the viscosity when tube wall temperature is lower than dew-point temperature of the dust stratification on the heat exchange element, so be difficult to remove with soot blower.
Summary of the invention
The purpose of this utility model provides a kind of adjustable air preheater, and it can prevent effectively that the low-temperature zone tube wall temperature is lower than the flue gas dew point temperature, and the variation of cigarette, airload is had stronger adaptive capacity.
Above-mentioned purpose of the present utility model is achieved through the following technical solutions:
A kind of adjustable air preheater comprises:
The heat transfer medium supply unit comprises delivery pump, first control valve and second control valve;
Heat exchange unit comprises:
Be positioned at the axial heat pipe element of exhaust gases passes and air duct high temperature section;
Be positioned at the sleeve type heat-pipe elements of exhaust gases passes low-temperature zone, its input port links to each other with the delivery pump outlet through second control valve;
Be positioned at the fin tube type heat exchange element of air duct low-temperature zone, its input port links to each other with the delivery pump inlet with the output port of sleeve type heat-pipe elements respectively with output port, and first control valve is connected between its input port and the output port.
In above-mentioned adjustable air preheater, reasonablely be, further comprise and be arranged at sleeve type heat-pipe elements respectively near the outside wall surface of exhaust gases passes gas outlet and first and second temperature sensors near the pipeline of output port, when the detected temperatures of first temperature sensor sets value less than first, the control valve control device leaves greatly first control valve, when the second temperature sensor detected temperatures sets value greater than second, the control valve control device leaves greatly second control valve, when the second temperature sensor detected temperatures set value less than second, it is little that the control valve control device leaves second control valve.
In above-mentioned adjustable air preheater, reasonable is that the pipeline of described sleeve type heat-pipe elements and fin tube type heat exchange element delivered inside heat transfer medium is provided with the heat exchange area of some valves with regulating element.
In above-mentioned adjustable air preheater, reasonable is that the described first and second control valve two ends are parallel with stop valve respectively.
In according to adjustable air preheater of the present utility model, can be by regulating the inner valve that is provided with of first, second control valve and sleeve type heat-pipe elements and fin tube type heat exchange element, in very wide scope, regulate heat-exchange capacity to adapt to the acute variation of flue gas and air themperature, load, and when flue-gas temperature is low, adjustable air preheater of the present utility model can guarantee that still the tube wall temperature of low-temperature zone remains on more than the acid dew point, thereby has thoroughly solved the problem of low temperature acid dew piont corrosion.
Description of drawings
Fig. 1 is the schematic diagram according to adjustable air preheater of the present utility model.
The specific embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present utility model is described.
The adjustable air preheater of present embodiment comprises heat transfer medium supply unit and heat exchange unit two large divisions, wherein supply unit comprises delivery pump 5, first control valve 4 and second control valve 6, and heat exchange unit comprises sleeve type heat-pipe elements 1, axial heat pipe element 2 and fin tube type heat exchange element 3.
In exhaust gases passes shown in Figure 1 10, air inlet near zone (i.e. the top of exhaust gases passes among the figure) is not fully absorbed as yet owing to flue gas heat, so it is should the zone flue-gas temperature higher, be called high temperature section, otherwise, gas outlet near zone (i.e. the bottom of exhaust gases passes among the figure) since flue gas heat fully absorbed, so should the zone flue-gas temperature lower, be called low-temperature zone.In air duct 11, air inlet near zone (i.e. air duct bottom among the figure) is not because air fully absorbs heat as yet, so this regional air temperature is lower, be called low-temperature zone, otherwise, gas outlet near zone (i.e. the top of air duct among the figure) so this regional air temperature is higher, is called high temperature section because air fully absorbs heat.As shown in Figure 1, one section high temperature section that is positioned at exhaust gases passes 10 of axial heat pipe element 2, another section is positioned at the high temperature section of air duct 11, in axial heat pipe element 2 inside, the flue gas heat that exhaust gases passes 10 high temperature section partially absorb is transferred to and is positioned at air duct 11 high temperature section parts, gives air with the exchange heat that absorbs again there.
As mentioned above, only adopt this heat exchange mode can not guarantee that the heat exchange element tube wall temperature of flue low-temperature zone is higher than the flue gas dew point temperature, and also can't adapt to the acute variation of cigarette, airload.In the utility model, respectively at low-temperature zone and the low-temperature zone setting of air duct 11 and the sleeve type heat-pipe elements 1 and the fin tube type heat exchange element 3 of heat transfer medium transmission unit pipeline connection of exhaust gases passes 10, by the closed cycle of heat transfer medium in two heat exchange elements, between exhaust gases passes 10 low-temperature zone and air duct 11 low-temperature zone, realize heat exchange.By regulating the flow of heat transfer medium, this air preheater can prevent that the heat exchange element tube wall temperature of flue low-temperature zone is lower than the flue gas dew point temperature, and makes the heat-exchange capacity of whole air preheater and load be complementary.
The heat transfer medium supply unit is connected as shown in Figure 1 with the pipeline of sleeve type heat-pipe elements 1 and fin tube type heat exchange element 3, wherein, the input port of sleeve type heat-pipe elements 1 links to each other with the outlet of delivery pump 5 through second control valve 6, the input port of fin tube type heat exchange element 3 links to each other with the output port of sleeve type heat-pipe elements 1 and the inlet of delivery pump 5 respectively with output port, and first control valve 4 is connected between its input port and the output port.Reasonable is to be parallel with maintenance and the maintenance of stop valve to make things convenient for control valve respectively at the two ends of first and second control valves.
In order further to improve the heat exchange regulating power, as shown in Figure 1, flow and the heat exchange area of some valves 11,12,31 and 32 to regulate heat transfer medium in the whole element also can be set on the pipeline of sleeve type heat-pipe elements 1 and fin tube type heat exchange element 3 delivered inside heat transfer mediums.Valve can be that hand-operated valve also can be an automatic regulating valve, is decided by concrete applicable cases.
Referring to Fig. 1, for in time, measure sleeve type heat-pipe elements outside wall temperature and flow out the temperature of the heat transfer medium of sleeve type heat-pipe elements 1 exactly, in this preferred embodiment, also first and second temperature sensors 8 and 7 are set at sleeve type heat-pipe elements 1 near the outside wall surface of exhaust gases passes 10 gas outlets and near the pipeline the output port respectively.In addition, safety valve 9 is set also on the outlet pipeline of sleeve type heat-pipe elements 1, security of system is guaranteed in automatic take-off when hydraulic pressure is higher than setting value.
The operation principle of the adjustable air preheater of present embodiment is below described.
As shown in Figure 1, when flue gas flowed along the direction of arrow in the figure, its heat at first by axial heat pipe element 2 heat absorptions that are positioned at high temperature section, was further absorbed by the sleeve type heat-pipe elements 1 that is positioned at low-temperature zone then.When air flowed along the direction of arrow in the figure, it at first absorbed heat from the fin tube type heat exchange element 3 that is positioned at low-temperature zone, absorbed heat from the axial heat pipe element 2 that is positioned at high temperature section then, and temperature rises to the highest.
Meanwhile, the closed cycle process of heat transfer medium is as follows in sleeve type heat-pipe elements 1 and the fin tube type heat exchange element 3.The heat transfer medium that delivery pump 5 is lower with temperature is sent into sleeve type heat-pipe elements 1, be heated to design temperature by the low-temperature zone flue gas, send into fin tube type heat exchange element 3 through the transmission unit pipeline then, carry out heat exchange to add hot-air with the air of air duct low-temperature zone, deliver to delivery pump 5 to begin new medium circulation process through the transmission unit pipeline again when the heat transfer medium temperature drops to design temperature.
In actual moving process, when the detected temperatures of temperature sensor 8 is lower than a certain setting value, the outside wall temperature that shows sleeve type heat-pipe elements 1 has the trend that is lower than acid dew-point temperature, therefore the control valve control device that links to each other with temperature sensor 8 is driven greatly control valve 4, thereby the heat transfer medium that sleeve type heat-pipe elements 1 flows out is distributed to delivery pump 5 more, improve the water temperature that enters sleeve type heat-pipe elements 1, guarantee that tube wall temperature is higher than acid dew-point temperature.When the detected temperatures of temperature sensor 7 during greater than a certain setting value, the heat transfer medium temperature that shows sleeve type heat-pipe elements 1 is too high, in order to prevent the medium vaporization, the control valve control device that links to each other with temperature sensor 7 is driven greatly control valve 6, reduce the back pressure of heat-exchanger pump, increase the flow that is delivered to sleeve type heat-pipe elements 1.Otherwise, when the detected temperatures of temperature sensor 7 during less than a certain setting value, the heat transfer medium temperature that shows sleeve type heat-pipe elements 1 is low excessively, and it is little that the control valve control device that links to each other with temperature sensor 7 is driven control valve 6, reduces the flow that is delivered to sleeve type heat-pipe elements 1.
When the load variations of flue gas or air is very big, for the heat-exchange capacity that makes air preheater is complementary with it, not only to regulate the rate-of flow of turnover sleeve type heat-pipe elements 1 and fin tube type heat exchange element 3 by control valve 4 and 6, but also will be by closing or open control valve 11,12,31 and 32, increase or reduce the heat exchange area of heat exchange element, thereby reach the purpose of control wall temperature and circulating water temperature indirectly.
Claims (4)
1. an adjustable air preheater is characterized in that, comprises:
The heat transfer medium supply unit comprises delivery pump, first control valve and second control valve;
Heat exchange unit comprises:
Be positioned at the axial heat pipe element of exhaust gases passes and air duct high temperature section;
Be positioned at the sleeve type heat-pipe elements of exhaust gases passes low-temperature zone, its input port links to each other with the delivery pump outlet through second control valve;
Be positioned at the fin tube type heat exchange element of air duct low-temperature zone, its input port links to each other with the delivery pump inlet with the output port of sleeve type heat-pipe elements respectively with output port, and first control valve is connected between its input port and the output port.
2. adjustable air preheater as claimed in claim 1, it is characterized in that, further comprise and be arranged at sleeve type heat-pipe elements respectively near the outside wall surface of exhaust gases passes gas outlet and first and second temperature sensors near the pipeline of output port, when the detected temperatures of first temperature sensor sets value less than first, the control valve control device leaves greatly first control valve, when the second temperature sensor detected temperatures sets value greater than second, the control valve control device leaves greatly second control valve, when the second temperature sensor detected temperatures set value less than second, it is little that the control valve control device leaves second control valve.
3. adjustable air preheater as claimed in claim 1 or 2 is characterized in that, the pipeline of described sleeve type heat-pipe elements and fin tube type heat exchange element delivered inside heat transfer medium is provided with the heat exchange area of some valves with regulating element.
4. adjustable air preheater as claimed in claim 3 is characterized in that, the described first and second control valve two ends are parallel with stop valve respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU032553056U CN2630667Y (en) | 2003-07-07 | 2003-07-07 | Adjustable air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU032553056U CN2630667Y (en) | 2003-07-07 | 2003-07-07 | Adjustable air preheater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2630667Y true CN2630667Y (en) | 2004-08-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU032553056U Expired - Fee Related CN2630667Y (en) | 2003-07-07 | 2003-07-07 | Adjustable air preheater |
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| Country | Link |
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| CN (1) | CN2630667Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101586918B (en) * | 2009-06-24 | 2010-09-15 | 哈尔滨金鑫电气有限责任公司 | Multi-stage waste heat recovery device of industrial furnace high-temperature flue gas |
| CN103196322A (en) * | 2013-04-25 | 2013-07-10 | 安丰宝 | Corrosion prevention method and device of flue gas heat exchanger for kiln |
| CN103542423A (en) * | 2012-07-09 | 2014-01-29 | 中国石油化工集团公司 | Heat pipe air preheater |
-
2003
- 2003-07-07 CN CNU032553056U patent/CN2630667Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101586918B (en) * | 2009-06-24 | 2010-09-15 | 哈尔滨金鑫电气有限责任公司 | Multi-stage waste heat recovery device of industrial furnace high-temperature flue gas |
| CN103542423A (en) * | 2012-07-09 | 2014-01-29 | 中国石油化工集团公司 | Heat pipe air preheater |
| CN103542423B (en) * | 2012-07-09 | 2016-01-13 | 中国石油化工集团公司 | A kind of heat-pipe air preheater |
| CN103196322A (en) * | 2013-04-25 | 2013-07-10 | 安丰宝 | Corrosion prevention method and device of flue gas heat exchanger for kiln |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |