CN105333451A - Cold air feeding device for air preheater of thermal power plant - Google Patents
Cold air feeding device for air preheater of thermal power plant Download PDFInfo
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- CN105333451A CN105333451A CN201510830800.0A CN201510830800A CN105333451A CN 105333451 A CN105333451 A CN 105333451A CN 201510830800 A CN201510830800 A CN 201510830800A CN 105333451 A CN105333451 A CN 105333451A
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- bend pipe
- bend
- air preheater
- deferent
- thermal power
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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
Abstract
The invention discloses a cold air feeding device for an air preheater of a thermal power plant. The cold air feeding device comprises a fan, a first-grade air way pipe, an elbow mechanism, a second-grade air way pipe and a cold air joint connected with the air preheater, wherein the fan, the first-grade air way pipe, the elbow mechanism, the second-grade air way pipe and the cold air joint are connected in sequence; the elbow mechanism comprises a shunt joint, multiple bent pipes with circular sections and a flow gathering joint; an inlet of the shunt joint is connected with an outlet of the first-grade air way pipe; one ends of the multiple bent pipes are connected to an outlet of the shunt joint, and the other ends of the multiple bent pipes are all connected to an inlet of the flow gathering joint; the multiple bent pipes are tightly arranged; and the flow gathering joint is connected with the second-grade air way pipe. The cold air feeding device is excellent in uniformity of guided cold air, improves the preheating effect of the air preheater, and reduces the production investment cost.
Description
Technical field
The present invention relates to steam power plant, specifically a kind of cold wind feeder for thermal power plant air preheater.
Background technology
In the air and gas system in thermal power plant, boiler air preheater utilizes the flue gas heat of boiler tail to add the visual plant of hot-air.Air preheater utilizes the heat in flue gas to add hot-air, and air themperature is raised, and exhaust gas temperature reduces, and decreases the flue gas loss of boiler; In addition, send in stove after air is heated, make stove fuel catch fire rapidly, burning is completely strong, and the machinery and the chemistry that thus decrease fuel not exclusively lose.Therefore, the quality of the effect of the exchange heat of flue gas and air in boiler air preheater, will directly affect the efficiency of boiler.
At present in 600MW and above large-size thermal power plant unit, as depicted in figs. 1 and 2, for air preheater provides the cold wind feeder of cold wind to form primarily of blower fan 1, force one wind deferent 2, the elbow 3 equal with force one wind deferent 2 internal diameter size, light breeze deferent 4 and cold wind joint 5.The cross section of force one wind deferent and light breeze deferent is rectangle or the circle of large-size.Wherein blower fan adopts axial flow blower, and axial flow blower is horizontally disposed more than 0m ground, boiler room.Axial flow blower adopts round exit, and air-flow is from the injection of fan outlet level, and axial flow blower center line of discharge absolute altitude is about 2 ~ 3m.The cold wind interface of air preheater is generally rectangular opening, and because be subject to the impact of heat exchange efficiency in air preheater, require that the flow velocity that cold wind enters air preheater exports far below axial flow blower, therefore the cross-sectional area of the cold wind interface of air preheater differs larger with the cross-sectional area that axial flow blower exports.In addition, vertically downward, the absolute altitude of its interface surface is generally no more than 14m to the cold wind interface of boiler air preheater.Therefore, after air enters axial flow blower from axial flow blower inlet scoop, fan blade effect through axial flow blower is penetrated from axial flow blower outlet level, upwards flow through diffusion, 90 ° of turnings in force one wind deferent, enter in light breeze deferent and spread again, then enter in air preheater from the cold wind interface of air preheater and carry out heat exchange with flue gas.
Though current cold wind feeder can carry out work, but still following defect can be there is in it: for 600MW and above thermal power generation unit, when cold air duct adopts conventional circle or rectangular duct design, be subject to the impact of the comparatively large and air preheater device interface height limitation of duct dimension, air-flow is after 90 ° are turned, understand skewness when entering air preheater again, have a strong impact on the heat transfer effect of air preheater.And when being solution cold air skewness problem and increasing deflector in force one wind deferent and light breeze deferent; weld seam between deflector and wind channel tube is easy to tear under air-flow alternate stress effect repeatedly; deflector can come off and even block runner; cause compressor emergency shutdown, have a strong impact on the safety of unit operation with reliable.Meanwhile, the size of force one wind deferent and light breeze deferent is comparatively large, and force one wind deferent and light breeze deferent need to have extremely strong bearing capacity, therefore need to arrange reinforcing rib in force one wind deferent and secondary air channel, then this needs more manufactured materials, and cause consumptive material doses large, manufacturing cost is high.
Summary of the invention
The object of the invention is to the deficiency overcoming the existence of above prior art, provide a kind of cold wind feeder for thermal power plant air preheater.This cold wind feeder for thermal power plant air preheater ensure that the cooling air distribution entering air preheater is even, improves the heat transfer effect of air preheater, also improves safety and reliability simultaneously.
In order to achieve the above object, the present invention is by the following technical solutions: a kind of cold wind feeder for thermal power plant air preheater, comprise blower fan, force one wind deferent, elbow mechanism, light breeze deferent and the cold wind joint be connected with air preheater, described blower fan, force one wind deferent, elbow mechanism, light breeze deferent is connected successively with cold wind joint, described elbow mechanism comprises tap, the bend pipe that many cross sections are rounded and the joint that confluxes, the entrance of described tap is connected with the outlet of force one wind deferent, one end of many described bend pipes is connected to the outlet of tap, the other end of many described bend pipes is all connected to the entrance of the joint that confluxes, and many described bend pipe close-packed arrays distributions, the described joint that confluxes is connected with light breeze deferent.
Preferably, the quantity of described bend pipe be greater than 1 natural square root bar, all bend pipes are square array distribution.
Preferably, the quantity of described bend pipe is 4, and these 4 described bend pipes comprise 2 the first bend pipes and 2 the second bend pipes, and the internal diameter of these 2 the first bend pipes and 2 the second bend pipes is all equal.
Preferably, the bending radius of described first bend pipe is less than the bending radius of the second bend pipe.
Preferably, the internal diameter of described first bend pipe and the second bend pipe is d, and the bending radius of described first bend pipe is 1.5d, and the bending radius of described second bend pipe is 2.5d.
Preferably, the quantity of described bend pipe is 9, and these 9 articles of described bend pipes comprise 3 article of first bend pipe, 3 article of second bend pipe and 3 article of the 3rd bend pipe, and the internal diameter of described first bend pipe, the second bend pipe and the 3rd bend pipe is all equal.
Preferably, the bending radius of described first bend pipe, the second bend pipe and the 3rd bend pipe increases successively.
Preferably, the internal diameter of described first bend pipe, the second bend pipe and the 3rd bend pipe is d, and the bending radius of described first bend pipe is 2d, and the bending radius of described second bend pipe is 3d, and the bending radius of described 3rd bend pipe is 4d.
Preferably, the cross section of described force one wind deferent and light breeze deferent is all rounded.
The present invention, relative to prior art, has following advantage and effect:
1, this elbow mechanism be used in the cold wind feeder of thermal power plant air preheater adopts tap, conflux joint and many cross sections present circular bend pipe and replace traditional large scale elbow, then enter the uniformity of air preheater through the cold wind of force one wind deferent, bend pipe and light breeze deferent successively good, the pre-heat effect of air preheater can be improve.
2, this elbow mechanism be used in the cold wind feeder of thermal power plant air preheater adopts tap, conflux joint and many cross sections present circular bend pipe and replace traditional large scale elbow; then do not need to set up deflector in force one wind deferent and light breeze deferent; the weld seam between deflector and wind channel tube is avoided to be easy to tear under air-flow alternate stress effect repeatedly; and deflector can be come off even block runner; cause compressor emergency shutdown, thus improve the safety of unit operation and reliable.
3, this elbow mechanism be used in the cold wind feeder of thermal power plant air preheater adopts tap, conflux joint and many cross sections present circular bend pipe and replace traditional large scale elbow, then the be easier to guarantee of bend pipe has good intensity, do not need to increase fixing rib, reduce the use of material; And when ensureing sufficient intensity, using many bend pipes to replace the material used during large scale elbow also can be less, manufacturing cost can be reduced further.
4, this elbow mechanism be used in the cold wind feeder of thermal power plant air preheater adopts tap, conflux joint and many cross sections present circular bend pipe and replace traditional large scale elbow, after utilizing tap to shunt, again by many bend pipe water conservancy diversion, which reduce the resistance of diversion air duct.
Accompanying drawing explanation
Fig. 1 is the first structural representation of traditional cold wind feeder for thermal power plant air preheater.
Fig. 2 is the second structural representation of traditional cold wind feeder for thermal power plant air preheater.
Fig. 3 is the structural representation of the cold wind feeder for thermal power plant air preheater of the embodiment of the present invention 1.
Fig. 4 is the side view of the cold wind feeder for thermal power plant air preheater of the embodiment of the present invention 1.Arrow in figure is the flow direction of cold wind.
Fig. 5 is the structural representation of the tap of the embodiment of the present invention 1.
Fig. 6 is the distribution map after the embodiment of the present invention 1 first bend pipe and the second bend pipe install.
Fig. 7 is the structural representation of the joint that confluxes of the embodiment of the present invention 1.
Fig. 8 is the structural representation of the bend pipe of the embodiment of the present invention 2.
Detailed description of the invention
For ease of it will be appreciated by those skilled in the art that the present invention is described in further detail below in conjunction with drawings and Examples.
Embodiment 1
As shown in Fig. 3 to Fig. 7, this is used for the cold wind feeder of thermal power plant air preheater, comprise blower fan 1, force one wind deferent 2, elbow mechanism 6, light breeze deferent 4 and the cold wind joint 5 be connected with air preheater, described blower fan 1, force one wind deferent 2, elbow mechanism 6, light breeze deferent 4 is connected successively with cold wind joint 5, described elbow mechanism 6 comprises tap 61, the bend pipe 62 that many cross sections are rounded and the joint 63 that confluxes, the entrance of described tap 61 is connected with the outlet of force one wind deferent 2, one end of many described bend pipes 62 is connected to the outlet of tap 61, the other end of many described bend pipes 62 is all connected to the entrance of the joint 63 that confluxes, and many described bend pipe 62 close-packed arrays distributions, the described joint 63 that confluxes is connected with light breeze deferent 4.And the cross section of described force one wind deferent 2 and light breeze deferent 4 is all rounded.Concrete, the port of export of tap 61 has the outlet equal with bend pipe 62 quantity, and each of every bar bend pipe 62 and tap 61 exports corresponding connection, and this ensure that the sealing that bend pipe 62 is connected with force one wind deferent 2.Meanwhile, conflux joint 63 with ensure that the sealing be connected between bend pipe 62 with light breeze deferent 4.
The quantity of described bend pipe be greater than 1 natural square root bar, all bend pipes are square array distribution.During square array distribution, then often row is equal with the bend pipe quantity in often arranging.Namely when the quantity of bend pipe is n
2during bar, bend pipe distributes with the square array of n*n.
As shown in Fig. 3, Fig. 4 and Fig. 6, the quantity of described bend pipe 62 is 4, and these 4 described bend pipes 62 comprise 2 the first bend pipes 621 and 2 the second bend pipes 622, and the internal diameter of these 2 the first bend pipes 621 and 2 the second bend pipes 622 is all equal.And the bending radius of described first bend pipe 621 is less than the bending radius of the second bend pipe 622.This design can ensure that the structural compactness of elbow mechanism 6.Under the elbow mechanism 6 of this structure acts on, after air-flow enters tap 61 from force one wind deferent 2, be divided in the corresponding bend pipe 62 of inflow 4 of four with one, then converged by the joint 63 that confluxes, then the uniformity of the air-flow after bend pipe 62 at least improves 1 times than traditional large scale elbow.And known at the Integrated comparative of the concrete engineering of conventional 600MW thermal power generation unit, adopt the material consumption of the elbow mechanism 6 of the present embodiment compared with traditional rectangular elbow, the force one wind deferent 2 of single unit and light breeze deferent 4 can save material about 17.6 tons.Therefore which not only improves the uniformity of water conservancy diversion, also reduce the cost of investment of production.Simultaneously, due to the uniformity of water conservancy diversion, then with conventional 600MW thermal power generation unit for row, the heat exchange efficiency about 10% ~ 20% of air preheater can improve in the elbow mechanism 6 of the present embodiment, thus improving the boiler efficiency about 0.1% of air preheater, the consumption of standard coal for power generation rate of unit reduces about 0.2g/ (kWh).If by unit annual utilization hours be 5500 hours and mark coal price lattice by 950 yuan/ton of calculating, separate unit 600MW coal-burning boiler unit saves mark 660 tons, coal every year, saving fuel cost about 62.7 ten thousand yuan.
The internal diameter of described first bend pipe 621 and the second bend pipe 622 is d, and the bending radius of described first bend pipe 621 is 1.5d, and the bending radius of described second bend pipe 622 is 2.5d.Concrete, the diameter of force one wind deferent and light breeze deferent is D, and the cross-sectional area of one group of wind channel tube and light breeze deferent is equal to the summation of the cross-sectional area of 2 the first bend pipes and 2 the second bend pipes, therefore D=2d.And the bending radius in air channel is R, this R=D, therefore R=2d.And the bending radius of the first bend pipe 621 and the second bend pipe 622 is respectively 1.5d in the present embodiment, and 2.5d, adopt the analog computation of FLUENT simulation softward, in the present embodiment, the resistance of the first bend pipe 621 and the second bend pipe 622 is about 30Pa altogether; And rectangular elbow is under bending radius is 1.0D situation, the resistance of rectangular elbow is about 30Pa; The circular weld bend pipe in conventional circular air channel is under bending radius is 1.0D situation, and duct resistance is about 60Pa.The resistance of the elbow mechanism 6 of the present embodiment and traditional rectangular elbow maintain an equal level, and reduce about 30Pa than traditional rounded bend.
Embodiment 2
This is used for cold wind feeder of thermal power plant air preheater except following technical characteristic with embodiment 1:
As shown in Figure 8, the quantity of described bend pipe 62 is 9, and these 9 articles described bend pipes 62 comprise 3 article of first bend pipe, 621,3 article of second bend pipe, 622 and 3 article of the 3rd bend pipe 623, and the internal diameter of described first bend pipe 621, second bend pipe 622 and the 3rd bend pipe 623 is all equal.The bending radius of described first bend pipe 621, second bend pipe 622 and the 3rd bend pipe 623 increases successively.
The internal diameter of described first bend pipe 621, second bend pipe 622 and the 3rd bend pipe is d, and the bending radius of described first bend pipe 621 is 2d, and the bending radius of described second bend pipe 622 is 3d, and the bending radius of described second bend pipe 622 is 4d.Concrete, the diameter of force one wind deferent and light breeze deferent is D, and the cross-sectional area of one group of wind channel tube and light breeze deferent is equal to the summation of the cross-sectional area of 3 article of first bend pipe, 3 article of second bend pipe and 3 article of the 3rd bend pipe, therefore D=3d.And the bending radius in air channel is R, this R=D, therefore R=3d.And the bending radius of the first bend pipe 621, second bend pipe 622 and the 3rd bend pipe 633 is respectively 2d in the present embodiment, 3d and 4d, adopt the analog computation of FLUENT simulation softward, in the present embodiment, the resistance of the first bend pipe 621, second bend pipe 622 and the 3rd bend pipe is through 25Pa altogether; And rectangular elbow is under bending radius is 1.0D situation, the resistance of rectangular elbow is about 30Pa; The circular weld bend pipe in conventional circular air channel is under bending radius is 1.0D situation, and duct resistance is about 60Pa.Resistance and the traditional rectangular elbow of the elbow mechanism 6 of the present embodiment reduce about 5Pa, and reduce about 35Pa than traditional rounded bend.
Above-mentioned detailed description of the invention is the preferred embodiments of the present invention, can not limit the present invention, and any of other does not deviate from technical scheme of the present invention and the substitute mode of the change made or other equivalence, is included within protection scope of the present invention.
Claims (9)
1. the cold wind feeder for thermal power plant air preheater, comprise blower fan, force one wind deferent, elbow mechanism, light breeze deferent and the cold wind joint be connected with air preheater, described blower fan, force one wind deferent, elbow mechanism, light breeze deferent is connected successively with cold wind joint, it is characterized in that: described elbow mechanism comprises tap, the bend pipe that many cross sections are rounded and the joint that confluxes, the entrance of described tap is connected with the outlet of force one wind deferent, one end of many described bend pipes is connected to the outlet of tap, the other end of many described bend pipes is all connected to the entrance of the joint that confluxes, and many described bend pipe close-packed arrays distributions, the described joint that confluxes is connected with light breeze deferent.
2. the cold wind feeder for thermal power plant air preheater according to claim 2, is characterized in that: the quantity of described bend pipe be greater than 1 natural square root bar, all bend pipes are square array distribution.
3. the cold wind feeder for thermal power plant air preheater according to claim 2, it is characterized in that: the quantity of described bend pipe is 4, these 4 described bend pipes comprise 2 the first bend pipes and 2 the second bend pipes, and the internal diameter of these 2 the first bend pipes and 2 the second bend pipes is all equal.
4. the cold wind feeder for thermal power plant air preheater according to claim 3, is characterized in that: the bending radius of described first bend pipe is less than the bending radius of the second bend pipe.
5. the cold wind feeder for thermal power plant air preheater according to claim 4, it is characterized in that: the internal diameter of described first bend pipe and the second bend pipe is d, the bending radius of described first bend pipe is 1.5d, and the bending radius of described second bend pipe is 2.5d.
6. the cold wind feeder for thermal power plant air preheater according to claim 3, it is characterized in that: the quantity of described bend pipe is 9, these 9 articles of described bend pipes comprise 3 article of first bend pipe, 3 article of second bend pipe and 3 article of the 3rd bend pipe, and the internal diameter of described first bend pipe, the second bend pipe and the 3rd bend pipe is all equal.
7. the cold wind feeder for thermal power plant air preheater according to claim 1, is characterized in that: the bending radius of described first bend pipe, the second bend pipe and the 3rd bend pipe increases successively.
8. the cold wind feeder for thermal power plant air preheater according to claim 7, it is characterized in that: the internal diameter of described first bend pipe, the second bend pipe and the 3rd bend pipe is d, the bending radius of described first bend pipe is 2d, the bending radius of described second bend pipe is 3d, and the bending radius of described 3rd bend pipe is 4d.
9. the cold wind feeder for thermal power plant air preheater according to claim 1, is characterized in that: the cross section of described force one wind deferent and light breeze deferent is all rounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510830800.0A CN105333451A (en) | 2015-11-25 | 2015-11-25 | Cold air feeding device for air preheater of thermal power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510830800.0A CN105333451A (en) | 2015-11-25 | 2015-11-25 | Cold air feeding device for air preheater of thermal power plant |
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| CN105333451A true CN105333451A (en) | 2016-02-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510830800.0A Pending CN105333451A (en) | 2015-11-25 | 2015-11-25 | Cold air feeding device for air preheater of thermal power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107228377A (en) * | 2016-03-24 | 2017-10-03 | 中国电力工程顾问集团有限公司 | A kind of energy saving air duct device and air and gas system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012247082A (en) * | 2011-05-25 | 2012-12-13 | Jfe Steel Corp | Air preheater |
| CN103953939A (en) * | 2014-04-28 | 2014-07-30 | 中国能源建设集团广东省电力设计研究院 | Wet desulphurization mechanism |
| CN203869068U (en) * | 2014-04-28 | 2014-10-08 | 中国能源建设集团广东省电力设计研究院 | Smoke and air flue device and reducing elbow thereof |
| CN105042624A (en) * | 2015-08-20 | 2015-11-11 | 中国能源建设集团广东省电力设计研究院有限公司 | Flue-gas and air system and flow guide device, of flue-gas and air system, at cold secondary air inlet of air preheater |
| CN205191629U (en) * | 2015-11-25 | 2016-04-27 | 中国能源建设集团广东省电力设计研究院有限公司 | A device is sent into to cold wind for air heater of thermal power factory |
-
2015
- 2015-11-25 CN CN201510830800.0A patent/CN105333451A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012247082A (en) * | 2011-05-25 | 2012-12-13 | Jfe Steel Corp | Air preheater |
| CN103953939A (en) * | 2014-04-28 | 2014-07-30 | 中国能源建设集团广东省电力设计研究院 | Wet desulphurization mechanism |
| CN203869068U (en) * | 2014-04-28 | 2014-10-08 | 中国能源建设集团广东省电力设计研究院 | Smoke and air flue device and reducing elbow thereof |
| CN105042624A (en) * | 2015-08-20 | 2015-11-11 | 中国能源建设集团广东省电力设计研究院有限公司 | Flue-gas and air system and flow guide device, of flue-gas and air system, at cold secondary air inlet of air preheater |
| CN205191629U (en) * | 2015-11-25 | 2016-04-27 | 中国能源建设集团广东省电力设计研究院有限公司 | A device is sent into to cold wind for air heater of thermal power factory |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107228377A (en) * | 2016-03-24 | 2017-10-03 | 中国电力工程顾问集团有限公司 | A kind of energy saving air duct device and air and gas system |
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Application publication date: 20160217 |