CN110594777B - Steam supply system of air heater of boiler air preheater - Google Patents
Steam supply system of air heater of boiler air preheater Download PDFInfo
- Publication number
- CN110594777B CN110594777B CN201910917848.3A CN201910917848A CN110594777B CN 110594777 B CN110594777 B CN 110594777B CN 201910917848 A CN201910917848 A CN 201910917848A CN 110594777 B CN110594777 B CN 110594777B
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- CN
- China
- Prior art keywords
- water bath
- boiler
- bath heating
- air
- pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 94
- 238000010438 heat treatment Methods 0.000 claims abstract description 72
- 238000007789 sealing Methods 0.000 claims abstract description 18
- 239000003517 fume Substances 0.000 claims abstract description 9
- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 239000000779 smoke Substances 0.000 claims description 24
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 8
- 239000003546 flue gas Substances 0.000 abstract description 8
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000000605 extraction Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/04—Arrangements of recuperators
-
- 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
- F24H3/06—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators
- F24H3/08—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators by tubes
-
- 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
-
- 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 invention discloses a steam supply system of a boiler air preheater air heater, which comprises an air heater, an air preheater, a water bath heating mechanism, a first temperature sensor and a third electromagnetic valve, wherein the air transmission end of the air heater is in sealing connection with the air inlet end of the air preheater; when the temperature of boiler exhaust fume is higher, a part of boiler exhaust fume enters the water bath heating mechanism, after the water bath heating mechanism reaches the set temperature, external air flows into the heater after being heated by the water bath heating mechanism, when the external air flows into the heater, the temperature is increased, the heat transfer of the steam turbine to the boiler can be reduced, the heat loss of the boiler is reduced, the heating efficiency of the boiler is improved, and the flue gas heat of the boiler is fully utilized.
Description
Technical Field
The invention belongs to the technical field of boiler combustion, and particularly relates to a steam supply system of a boiler air preheater air heater.
Background
The air heater makes the temperature of the air entering the air preheater rise, and the wall temperature of the air preheater rises, so that low-temperature corrosion can be prevented, and the air preheater is a heat exchanger which is preheated by utilizing the exhaust heat of devices such as a boiler and the like, and has the functions of reducing the exhaust temperature of devices such as the boiler and the like, improving the heat efficiency, enabling the fuel to be easy to catch fire, stabilizing the combustion and improving the combustion efficiency.
In the original air preheater air heater steam supply system, a steam turbine conveys the heat of a boiler to an air heater in a low-pressure steam extraction mode, and the circulation efficiency of the steam turbine is improved to some extent due to the increase of the low-pressure steam extraction quantity, the heat efficiency of the boiler is reduced, and the heat efficiency of the boiler is more lost when the air preheater air heater air supply system is used for a long time.
Disclosure of Invention
To solve the problems set forth in the background art. The invention provides a steam supply system of a boiler air preheater and a heater, which has the characteristic of improving the heat efficiency.
In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a boiler air preheater air heater steam supply system, includes air heater and air preheater, the gas transmission end of air heater with air preheater's inlet end sealing connection still includes water bath heating mechanism, first temperature sensor and third solenoid valve, water bath heating mechanism with the third solenoid valve is parallelly connected on the air inlet tube of air heater, first temperature sensor installs the exhaust end at the boiler, water bath heating mechanism includes water bath heating case and exhaust pipe, the last sealing fixedly connected with of exhaust pipe a plurality of branch pipe, the branch pipe is located the inside of water bath heating case, exhaust pipe's one end with the exhaust end sealing connection of boiler, and the series connection has first solenoid valve, first temperature sensor with first solenoid valve signal connection, the inside of water bath heating case still installs the coiled pipe, the one end of coiled pipe is through pipeline and outside air inlet device sealing connection, and the series connection has the second solenoid valve, the other end of coiled pipe with the air inlet end sealing connection of air heater, the water bath heating case outer wall sealing connection of water bath heating case has second temperature sensor, second temperature sensor and third solenoid valve signal connection.
Preferably, a plurality of heat conducting fins which are arranged at equal intervals are integrally formed on the periphery of the outer wall of the branch pipe.
Preferably, a plurality of the branch pipes are horizontally arranged at equal intervals.
Preferably, the smoke exhaust pipe is positioned outside the water bath heating box.
Preferably, the top surface fixedly connected with water injection pipe of water bath heating cabinet, the water injection pipe with the inside of water bath heating cabinet is link up.
Preferably, the bottom surface fixedly connected with drain pipe of water bath heating cabinet, the drain pipe with the inside of water bath heating cabinet is link up.
Compared with the prior art, the invention has the beneficial effects that:
when the temperature of boiler exhaust fume is higher, a part of boiler exhaust fume enters the water bath heating mechanism, after the water bath heating mechanism reaches the set temperature, external air flows into the heater after being heated by the water bath heating mechanism, when the external air flows into the heater, the temperature is raised, the heat transfer of the steam turbine to the boiler can be reduced, the heat loss of the boiler is reduced, the heating efficiency of the boiler is improved, meanwhile, the smoke of the boiler is fully utilized, the specific heat capacity of water is larger, the heat of the smoke of the boiler can be fully absorbed, the short-time storage is carried out, the utilization rate is improved, and the heat loss is reduced.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic diagram of a water bath heating mechanism in the invention;
fig. 3 is a schematic view of a branch pipe structure in the present invention.
In the figure: 1. a warm air device; 2. an air preheater; 3. a water bath heating mechanism; 31. a water bath heating box; 311. a water injection pipe; 312. a drain pipe; 32. a smoke exhaust pipe; 321. a branch pipe; 322. a first electromagnetic valve; 323. a heat conduction fin; 33. a serpentine tube; 331. a second electromagnetic valve; 34. a second temperature sensor; 4. a first temperature sensor; 5. and a third solenoid valve.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-3, the present invention provides the following technical solutions: the utility model provides a boiler air preheater air heater steam supply system, including heater 1 and air preheater 2, the gas transmission end of heater 1 and the air inlet sealing connection of air preheater 2, still include water bath heating mechanism 3, first temperature sensor 4 and third solenoid valve 5, water bath heating mechanism 3 and third solenoid valve 5 are parallelly connected on the admission line of heater 1, first temperature sensor 4 installs the exhaust end at the boiler, water bath heating mechanism 3 includes water bath heating box 31 and exhaust pipe 32, the last fixedly connected with a plurality of branch pipe 321 of exhaust pipe 32, branch pipe 321 is located the inside of water bath heating box 31, the one end of exhaust pipe 32 and the exhaust end sealing connection of boiler, and the series connection has first solenoid valve 322, first temperature sensor 4 and first solenoid valve 322 signal connection, the inside of water bath heating box 31 still installs coiled pipe 33, the one end of coiled pipe 33 passes through pipeline and outside air inlet device sealing connection, and the series connection has the second solenoid valve 331, the other end sealing connection of coiled pipe 33 and the air inlet sealing connection of heater 1, water bath heating box 31 outer wall fixedly connected with second temperature sensor 34, second solenoid valve 331 signal connection is 5.
In this embodiment, when in use, the steam turbine transmits the heat of the boiler to the heater 1 in the form of low pressure steam extraction, the smoke exhaust end of the boiler is in sealing connection with the smoke inlet end of the air preheater 2, the water bath heating box 31 is filled with water, the heat is lower when the boiler begins burning, the smoke temperature of the smoke exhaust end of the boiler is lower, at this moment, the third electromagnetic valve 5 is in an open state, the outside air enters the heater 1 through the pipeline of the third electromagnetic valve 5, the air is preheated by the heater 1, then is input into the air preheater 2, is heated again by the air preheater 2, then is transmitted to the air inlet end of the boiler, finally enters the boiler, the burning efficiency is accelerated, the temperature in the boiler is continuously increased along with the further burning, the smoke temperature of the smoke exhaust end of the boiler is higher, the first electromagnetic valve 322 on the smoke exhaust pipe 32 is opened when the temperature reaches the set temperature of the first temperature sensor 4, when passing through the branch pipe 321, as the branch pipe 321 is positioned in the water bath heating box 31, water is injected into the water bath heating box 31, the heat of the high-temperature flue gas is dispersed through the smoke pipe 32 and absorbed by the water in the water bath heating box 31, the water in the water bath heating box 31 is continuously heated, when the water temperature in the water bath heating box 31 reaches the set value of the second temperature sensor 34, the second electromagnetic valve 331 is opened, the third electromagnetic valve 5 is closed, external air enters the heater 1 through the coiled pipe 33, when the external air passes through the coiled pipe 33, the air in the coiled pipe 33 can be heated due to the higher water temperature in the water bath heating box 31, so that the temperature is increased when the air flows into the heater 1, the heat transmission of the steam turbine to the boiler can be reduced, the loss of the heat of the boiler can be reduced, the heating efficiency of the boiler is improved, meanwhile, the flue gas of the boiler is fully utilized, the specific heat capacity of water is large, the heat of the flue gas of the boiler can be fully absorbed, short-time storage is carried out, the utilization rate is improved, and the heat loss is reduced.
Specifically, a plurality of heat conducting fins 323 which are arranged at equal intervals are integrally formed on the periphery of the outer wall of the branch pipe 321, so that high-temperature flue gas heat in the branch pipe 321 can be better dissipated, and the heat conduction efficiency is improved.
Specifically, the plurality of branch pipes 321 are horizontally arranged at equal intervals, so that water in the water bath heating box 31 can be uniformly heated, heat absorption of the water bath heating box is balanced, and heating efficiency is improved.
Specifically, the smoke exhaust pipe 32 is located outside the water bath heating box 31, the junction of the smoke exhaust pipe 32 and the branch pipe 321 is fragile, leakage is easy to occur, the smoke exhaust pipe 32 is located outside the water bath heating box 31, and the water bath heating box is convenient to install and maintain in the later stage and convenient to use.
Specifically, the top surface of the water bath heating box 31 is fixedly connected with a water injection pipe 311, the water injection pipe 311 is communicated with the inside of the water bath heating box 31, and water is injected into the water bath heating box 31 through the water injection pipe 311.
Specifically, the bottom surface fixedly connected with drain pipe 312 of water bath heating cabinet 31, drain pipe 312 link up with the inside of water bath heating cabinet 31, and the water in the water bath heating cabinet 31 accessible drain pipe 312 is discharged, realizes changing the water in the water bath heating cabinet 31.
The working principle and the using flow of the invention are as follows: when in use, the steam turbine transmits the heat of the boiler to the heater 1 in a low-pressure steam extraction mode, the smoke exhaust end of the boiler is in sealing connection with the smoke inlet end of the air preheater 2, the water bath heating box 31 is filled with water, the heat is lower when the boiler begins burning, the smoke temperature of the smoke exhaust end is lower, at the moment, the third electromagnetic valve 5 is in an open state, external air enters the heater 1 through a pipeline where the third electromagnetic valve 5 is positioned, the heater 1 preheats the air, then the air is input into the air preheater 2, the air preheater 2 heats again, then the air preheater 2 is transmitted to the air inlet end of the boiler, finally the air preheater enters the boiler, the combustion efficiency is accelerated, the temperature in the boiler is continuously increased along with the further combustion, the smoke temperature of the smoke exhaust end of the boiler is higher, the first electromagnetic valve 322 on the smoke exhaust pipe 32 is opened when the temperature reaches the set temperature of the first temperature sensor 4, when passing through the branch pipe 321, as the branch pipe 321 is positioned in the water bath heating box 31, water is injected into the water bath heating box 31, the heat of the high-temperature flue gas is dispersed through the smoke pipe 32 and absorbed by the water in the water bath heating box 31, the water in the water bath heating box 31 is continuously heated, when the water temperature in the water bath heating box 31 reaches the set value of the second temperature sensor 34, the second electromagnetic valve 331 is opened, the third electromagnetic valve 5 is closed, external air enters the heater 1 through the coiled pipe 33, when the external air passes through the coiled pipe 33, the air in the coiled pipe 33 can be heated due to the higher water temperature in the water bath heating box 31, so that the temperature is increased when the air flows into the heater 1, the heat transmission of the steam turbine to the boiler can be reduced, the loss of the heat of the boiler can be reduced, the heating efficiency of the boiler is improved, meanwhile, the flue gas of the boiler is fully utilized, the specific heat capacity of water is large, the heat of the flue gas of the boiler can be fully absorbed, short-time storage is carried out, the utilization rate is improved, and the heat loss is reduced.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides a boiler air preheater air heater steam supply system, includes air heater (1) and air preheater (2), the gas transmission end of air heater (1) with air preheater (2) inlet end sealing connection, its characterized in that: still include water bath heating mechanism (3), first temperature sensor (4) and third solenoid valve (5), water bath heating mechanism (3) with third solenoid valve (5) are in parallel on the air inlet line of heater (1), the exhaust fume end at the boiler is installed to first temperature sensor (4), water bath heating mechanism (3) include water bath heating cabinet (31) and exhaust fume pipe (32), sealed fixedly connected with a plurality of branch pipe (321) on exhaust fume pipe (32), branch pipe (321) are located the inside of water bath heating cabinet (31), the one end of exhaust fume pipe (32) with the exhaust fume end sealing connection of boiler, and establish ties there is first solenoid valve (322), first temperature sensor (4) with first solenoid valve (322) signal connection, the inside of water bath heating cabinet (31) is still installed in flexible pipe (33), the one end of flexible pipe (33) is through pipeline and outside air inlet device sealing connection, and the cluster is connected with second solenoid valve (32), the other end (331) and second solenoid valve (31) are connected with the air inlet end sealing connection of second solenoid valve (34), flexible pipe (331) and second solenoid valve (34) are connected with the air inlet line (34), the second solenoid valve (34) is connected with the second solenoid valve (34), the sensor (34) is connected with the air inlet line of the second solenoid valve (34) The third electromagnetic valve (5) is in signal connection.
2. The boiler air preheater air heater steam supply system of claim 1, wherein: the outer wall of the branch pipe (321) is integrally formed with a plurality of heat conducting fins (323) which are equidistantly arranged at intervals.
3. The boiler air preheater air heater steam supply system of claim 1, wherein: the branch pipes (321) are horizontally arranged at equal intervals.
4. The boiler air preheater air heater steam supply system of claim 1, wherein: the smoke exhaust pipe (32) is positioned outside the water bath heating box (31).
5. The boiler air preheater air heater steam supply system of claim 1, wherein: the top surface fixedly connected with water injection pipe (311) of water bath heating cabinet (31), water injection pipe (311) with the inside of water bath heating cabinet (31) link up.
6. The boiler air preheater air heater steam supply system of claim 1, wherein: the bottom surface fixedly connected with drain pipe (312) of water bath heating cabinet (31), drain pipe (312) with the inside of water bath heating cabinet (31) link up.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910917848.3A CN110594777B (en) | 2019-09-26 | 2019-09-26 | Steam supply system of air heater of boiler air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910917848.3A CN110594777B (en) | 2019-09-26 | 2019-09-26 | Steam supply system of air heater of boiler air preheater |
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| Publication Number | Publication Date |
|---|---|
| CN110594777A CN110594777A (en) | 2019-12-20 |
| CN110594777B true CN110594777B (en) | 2024-04-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910917848.3A Active CN110594777B (en) | 2019-09-26 | 2019-09-26 | Steam supply system of air heater of boiler air preheater |
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| CN (1) | CN110594777B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1260725A (en) * | 1968-01-17 | 1972-01-19 | Babcock & Wilcox Ltd | Improvements relating to tubular heat exchangers |
| CN102278768A (en) * | 2011-06-28 | 2011-12-14 | 高明逊 | Energy-saving optimizing control system of power station boiler steam air heater |
| CN103398369A (en) * | 2013-08-05 | 2013-11-20 | 吕克庆 | Method and system for comprehensive utilization of tail heat of boiler |
| CN104896503A (en) * | 2015-06-19 | 2015-09-09 | 东方电气集团东方锅炉股份有限公司 | Boiler smoke waste heat use system |
| CN205227380U (en) * | 2015-11-07 | 2016-05-11 | 中机国能电力工程有限公司 | Fan heater system based on steam turbine exhaust steam and boiler gas recirculation utilize |
| CN106500127A (en) * | 2017-01-06 | 2017-03-15 | 上海明华电力技术工程有限公司 | A kind of bypass air preheater heat recovery system and method |
| CN107490191A (en) * | 2017-09-06 | 2017-12-19 | 西安交通大学 | A kind of contact heat exchange type desulfurization and denitrification integral natural gas condensing boiler |
| WO2018014768A1 (en) * | 2016-07-21 | 2018-01-25 | 京能（锡林郭勒）发电有限公司 | Residual heat reuse system for turbine-boiler integrated heat energy circulation |
| CN109737446A (en) * | 2019-01-06 | 2019-05-10 | 大唐(北京)能源管理有限公司 | A kind of recycling of power plant boiler smoke discharging residual heat and flue gas disappear white system |
| CN210601710U (en) * | 2019-09-26 | 2020-05-22 | 中国电建集团河南工程有限公司 | Steam supply device for air heater of boiler air preheater |
-
2019
- 2019-09-26 CN CN201910917848.3A patent/CN110594777B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1260725A (en) * | 1968-01-17 | 1972-01-19 | Babcock & Wilcox Ltd | Improvements relating to tubular heat exchangers |
| CN102278768A (en) * | 2011-06-28 | 2011-12-14 | 高明逊 | Energy-saving optimizing control system of power station boiler steam air heater |
| CN103398369A (en) * | 2013-08-05 | 2013-11-20 | 吕克庆 | Method and system for comprehensive utilization of tail heat of boiler |
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| CN205227380U (en) * | 2015-11-07 | 2016-05-11 | 中机国能电力工程有限公司 | Fan heater system based on steam turbine exhaust steam and boiler gas recirculation utilize |
| WO2018014768A1 (en) * | 2016-07-21 | 2018-01-25 | 京能（锡林郭勒）发电有限公司 | Residual heat reuse system for turbine-boiler integrated heat energy circulation |
| CN106500127A (en) * | 2017-01-06 | 2017-03-15 | 上海明华电力技术工程有限公司 | A kind of bypass air preheater heat recovery system and method |
| CN107490191A (en) * | 2017-09-06 | 2017-12-19 | 西安交通大学 | A kind of contact heat exchange type desulfurization and denitrification integral natural gas condensing boiler |
| CN109737446A (en) * | 2019-01-06 | 2019-05-10 | 大唐(北京)能源管理有限公司 | A kind of recycling of power plant boiler smoke discharging residual heat and flue gas disappear white system |
| CN210601710U (en) * | 2019-09-26 | 2020-05-22 | 中国电建集团河南工程有限公司 | Steam supply device for air heater of boiler air preheater |
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| CN110594777A (en) | 2019-12-20 |
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