CN102297633A - Cleaning method and cleaning system of air heater - Google Patents
Cleaning method and cleaning system of air heater Download PDFInfo
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- CN102297633A CN102297633A CN2010102152123A CN201010215212A CN102297633A CN 102297633 A CN102297633 A CN 102297633A CN 2010102152123 A CN2010102152123 A CN 2010102152123A CN 201010215212 A CN201010215212 A CN 201010215212A CN 102297633 A CN102297633 A CN 102297633A
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Abstract
The invention discloses a cleaning method of an air heater, comprising the following steps of: supplying air to an air preheater through an air channel and the air heater in the air channel; detecting the pressure difference, between two sides of the air heater, in the air channel; comparing the pressure difference and a prestored threshold; and if the pressure difference is larger than the threshold, driving a high-pressure cleaner to clean the air heater. The embodiment of the invention further provides a cleaning system of the air heater. By using the technical scheme in the invention, the air heater can be automatically cleaned under the condition that a unit does not stop operation, thereby not only reducing the labor intensity of workers but also creating economic benefits.
Description
Technical field
The present invention relates to the steam air heater clean technologies in the thermoelectric generator, relate in particular to a kind of steam air heater clean method and steam air heater cleaning systems.
Background technology
The northern area of China in the thermal power generation unit, in order to prevent the cold end corrosion of air preheater, generally at wind steam air heater of air preheater inlet increase and secondary wind steam air heater, improves the temperature of air preheater intake air because winter temperature is low.In the steam air heater running, generally contain foreign material such as dust, catkin and winged insect in the intake air, such material stops up easily and rests in the heat exchange fin gap of steam air heater, time, long more accumulation was many more, cause that steam air heater stops up, steam air heater both sides differential pressure is big, strengthened duct resistance, thereby caused the blower fan unit consumption to increase, the easy stall of blower fan can influence blower fan and exert oneself and unit on-load ability when serious.
The inventor finds that at the above-mentioned blockage of steam air heater, steam air heater of the prior art can only just can be cleared up, and can not clear up the obstruction of steam air heater in the unit running process when unit outage in realizing process of the present invention.Therefore, one-sided or whole primary air fans of unit and overfire air fan are stopped transport and are handled the steam air heater obstruction, can cause heavy economic losses; Simultaneously, prior art needs kettleman people manually to operate in scale removal process, has increased working strength of workers.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of method and steam air heater cleaning systems of steam air heater cleaning, to be implemented under the situation that generating set do not stop transport steam air heater is carried out automated cleaning.
To achieve these goals, the embodiment of the invention provides a kind of steam air heater clean method, comprising: make air send into air preheater by steam air heater in air channel and the air channel; Detect the pressure reduction in air channel, described steam air heater both sides; The threshold value of described pressure reduction and pre-stored is compared, described steam air heater is cleared up if described pressure reduction, then drives high-pressure cleaning device greater than described threshold value.
To achieve these goals, the embodiment of the invention also provides a kind of steam air heater cleaning systems, comprises air channel and steam air heater, and described steam air heater is arranged in described air channel, and air is sent into air preheater by described air channel and steam air heater; Described system also comprises pressure test device, is used to detect the pressure reduction in air channel, described steam air heater both sides; Cleaning device is used for the threshold value of described pressure reduction and pre-stored is compared, if described pressure reduction, then drives high-pressure cleaning device greater than described threshold value described steam air heater is cleared up.
The useful technique effect of the embodiment of the invention: utilize technical scheme of the present invention, can realize under the situation that unit do not stop transport steam air heater being carried out automated cleaning, not only reduced working strength of workers, and created economic benefit.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, does not constitute limitation of the invention.In the accompanying drawings:
The flow chart of the steam air heater clean method that Fig. 1 provides for the embodiment of the invention;
Fig. 2 is the structured flowchart of the steam air heater cleaning systems of the embodiment of the invention;
Fig. 3 is the structural representation of the steam air heater cleaning systems of the embodiment of the invention;
Fig. 4 is the structural representation of the steam air heater cleaning systems of another embodiment of the present invention.
The specific embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the embodiment of the invention is described in further details below in conjunction with accompanying drawing.At this, illustrative examples of the present invention and explanation thereof are used to explain the present invention, but not as a limitation of the invention.
The flow chart of the steam air heater clean method that Fig. 1 provides for the embodiment of the invention.As shown in the figure, the steam air heater clean method comprises:
Step S101: make air send into air preheater by steam air heater in air channel and the air channel.Winter, boiler was normally in service, because the acid vapors that produces behind the combustion of sulfur in the coal, when being lower than dew-point temperature, acid solution will taking place condense and cause the bonding and equipment corrosion of black dirt, thereby cause the cold end corrosion to the air preheater of boiler tail.Therefore send into air preheater again after using steam air heater to add hot-air, can avoid cold end corrosion air preheater.
Step S102: the pressure reduction that detects air channel, steam air heater both sides.
The air pressure in air channel, steam air heater both sides is different owing to the drag effect of steam air heater.For example, if the steam air heater design resistance is 23mmH
2O, drag energy increases to 100mmH after the operation several months
2O.When detecting the air pressure in air channel, steam air heater both sides, device for pressure measurement can be installed in respectively on the side walls of steam air heater front and back, record the different force value in both sides, thereby obtain the air pressure difference of steam air heater both sides.
Step S103: the pressure reduction that obtains among the step S102 and the threshold value of pre-stored are compared, steam air heater is cleared up if described pressure reduction, then drives high-pressure cleaning device greater than described threshold value.In this step, the threshold value of pre-stored is the artificial air pressure difference of setting, and this air pressure difference can mark the chocking-up degree of steam air heater, can set different threshold values according to different steam air heater specifications.For general steam air heater, can set this air pressure difference is 600Pa, and promptly when the pressure differential of steam air heater both sides reached 600Pa, it was serious to show that steam air heater stops up, and has had influence on the operation of unit, and need carry out cleaning this moment.
Fig. 2 is the structured flowchart of the steam air heater cleaning systems of the embodiment of the invention.As shown in the figure, the steam air heater cleaning systems in the present embodiment comprise:
In the present embodiment, cleaning device comprises purge hole and scavenging conduit, and purge hole is at least one.Wherein, purge hole is positioned on the sidewall of described air channel, and scavenging conduit one end connects high-pressure installation, and an end stretches into the purging that carries out in the air channel steam air heater by purge hole.But the invention is not restricted to this, cleaning device can also be other structures.
Fig. 3 is the concrete structural representation of the steam air heater cleaning systems of the embodiment of the invention;
As shown in Figure 3, on steam air heater sheet 10, be connected with pressure test device, be used to measure the pressure reduction of steam air heater front and back and transmit pressure difference signal.When steam air heater took place to stop up, the resistance of steam air heater increased, thereby the pressure of steam air heater rear side is diminished, and the pressure reduction before and after the steam air heater can become big.When pressure reduction reaches certain value, need in time to clean steam air heater, otherwise can influence exerting oneself and the ability of unit on-load of blower fan, cause great economic loss.
In the present embodiment, on wind of steam air heater and the air channel sidewall below the secondary wind incoming flow, respectively open a purge hole 11,, the invention is not restricted to this certainly as purge passage.Pressure test device comprises pressure detector 13 and differential pressure pickup 14, pressure detector 13 is connected to the both sides, front and back of steam air heater sheet 10, be used for measuring respectively the pressure of steam air heater front and back, differential pressure pickup 14 is connected with pressure detector 13, be used to send the pressure difference that obtains, and by the programme-control motor of setting 15, when measured pressure reduction during greater than certain threshold value (can be made as 600Pa in the present embodiment), motor 15 work, thereby drive Open valve 16, introduce high pressure air or the water under high pressure that provides by high-pressure installation 12 by pressure duct 17.If high-pressure installation is an air compressor machine, what then introduce is high pressure air, if high-pressure installation is a high-pressure hydraulic pump, this introducing be water under high pressure.The pressure of described high pressure air or water under high pressure is approximately 0.5～5.0MPa.The other end at pressure duct 17 is provided with scavenging conduit 18, and scavenging conduit 18 stretches in the air channel by purge hole 11, and when cleaning, water under high pressure or high pressure air purge by 18 pairs of steam air heater sheets 10 of scavenging conduit.Treat that the steam air heater differential pressure is reduced to (can be 300Pa in the present embodiment) after the reasonable level, differential pressure pickup 14 control motor 15 stop, and valve-off 16 is finished the cleaning of steam air heater.In carrying out purge, generating set can be realized not stopping transport, thereby has improved economic benefit.
In the present embodiment, scavenging conduit 18 can be set be 45 ° angle, when being blown into high pressure air or water under high pressure, can clean completely at the main position to steam air heater like this from both sides with the air channel sidewall.Certainly also be not limited to setting like this, for example, 4 purge holes can be set, the scavenging conduit of each purge hole is arranged to different angles, as 30 °, 40 °, 50 ° and 60 °, can purge steam air heater simultaneously from different perspectives like this, can clean the every nook and cranny of steam air heater, better effects if; Equally,, can adjust the angle of scavenging conduit every some months if having only one or two purge holes, from 30 ° to 60 ° all can, can not cause so eternal purging less than the dead angle.
Fig. 4 is the schematic diagram of another embodiment of steam air heater of the present invention, also is a preferred embodiment of the present invention.
As shown in Figure 4, catch up with embodiment different be not need to be provided with purge hole in the present embodiment, but cleaning device is arranged to telescopic structure.When pressure reduction reached certain value and need clean, cleaning device put in the air channel automatically and purges, purge finish after, cleaning device withdraws from the air channel.
As shown in the figure, telescopic hollow shaft 19 is set, hollow shaft 19 1 ends are connected on high pressure air or the water under high pressure by valve 16, and the other end is equipped with nozzle head 20, and spray orifice is arranged on the nozzle head.When pressure detector 13 records pressure reduction before and after the steam air heater and reaches certain value, differential pressure pickup 14 will control unlatching motor 15, thus Open valve 16, and hollow shaft 19 is pushed into the below of steam air heater 10.After valve 16 is opened, drive motor 21 and start, motor 21 drives hollow shaft 19 by decelerator and rotates, and rotates thereby drive nozzle head 20, and the spray orifice on the nozzle head 20 sprays high pressure air or water under high pressure cleaning steam air heater in rotation.
In the present embodiment, be provided with limit switch 18 at the two ends of hollow shaft and control turning to of motor.In case nozzle head 20 arrives two ends of hollow shaft 19, motor 21 changes into anti-phase, thereby nozzle head 20 can purge steam air heater back and forth, and pressure reduction is reduced to reasonable value before and after steam air heater.After the steam air heater cleaning finished, after promptly the pressure difference before and after the steam air heater dropped to reasonable value, differential pressure pickup 14 by-pass valve controls 16 were closed, thereby motor 21 stops automatically, and hollow shaft 19 withdraws from the air channel.
Steam air heater cleaning systems in the present embodiment are better to the cleaning effect of steam air heater, because the purging back and forth of nozzle head can clean completely to each position of steam air heater.And cleaning device is positioned at the outside, air channel idle the time, not only can not influence the operate as normal of steam air heater, and has guaranteed that cleaning device is not contaminated.
The steam air heater device of the embodiment of the invention has carried out implementing test on certain boiler of power plant steam air heater, if unlatching pressure reduction is 600Pa, after purging 10～15 minutes, about the near 300Pa of the pressure reduction of steam air heater meeting, and do not need to stop unit operation, respond well.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; and be not intended to limit the scope of the invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a steam air heater clean method is characterized in that, described method comprises:
Make air send into air preheater by steam air heater in air channel and the air channel;
Detect the pressure reduction in air channel, described steam air heater both sides;
The threshold value of described pressure reduction and pre-stored is compared, described steam air heater is cleared up if described pressure reduction, then drives high-pressure cleaning device greater than described threshold value.
2. the method for claim 1 is characterized in that, described high-pressure cleaning device is air compressor machine or high-pressure hydraulic pump.
3. the method for claim 1 is characterized in that, described high-pressure cleaning device is cleared up described steam air heater, comprising:
Gases at high pressure in the described high-pressure cleaning device or highly pressurised liquid are cleared up described steam air heater by scavenging conduit and purge hole.
4. the method for claim 1 is characterized in that, described high-pressure cleaning device is cleared up described steam air heater, comprising:
Described high-pressure cleaning device connects hollow shaft, on the described hollow shaft nozzle head is housed, and pressure-air or water under high pressure high in the described high-pressure installation are cleared up described steam air heater by described hollow shaft and described nozzle head.
5. method as claimed in claim 4 is characterized in that, described hollow shaft is telescopic, and described nozzle head slides on described hollow shaft.
6. steam air heater cleaning systems, described system comprises air channel and steam air heater, described steam air heater is arranged in described air channel, and air is sent into air preheater by described air channel and steam air heater; It is characterized in that described system also comprises:
Pressure test device is used to detect the pressure reduction in air channel, described steam air heater both sides;
Cleaning device is used for the threshold value of described pressure reduction and pre-stored is compared, if described pressure reduction, then drives high-pressure cleaning device greater than described threshold value described steam air heater is cleared up.
7. system as claimed in claim 6 is characterized in that, described high-pressure cleaning device is air compressor machine or high-pressure hydraulic pump.
8. system as claimed in claim 6 is characterized in that, described cleaning device also comprises:
Purge hole and scavenging conduit, pressure-air in the described high-pressure cleaning device or water under high pressure are cleared up described steam air heater by scavenging conduit and purge hole.
9. system as claimed in claim 6 is characterized in that, described cleaning device also comprises:
Hollow shaft and nozzle head, described high-pressure cleaning device connects hollow shaft, on the described hollow shaft nozzle head is housed, and pressure-air or water under high pressure high in the described high-pressure installation are cleared up described steam air heater by described hollow shaft and described nozzle head.
10. system as claimed in claim 9 is characterized in that, described hollow shaft is telescopic, and described nozzle head slides on described hollow shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102152123A CN102297633A (en) | 2010-06-22 | 2010-06-22 | Cleaning method and cleaning system of air heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102152123A CN102297633A (en) | 2010-06-22 | 2010-06-22 | Cleaning method and cleaning system of air heater |
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| CN102297633A true CN102297633A (en) | 2011-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010102152123A Pending CN102297633A (en) | 2010-06-22 | 2010-06-22 | Cleaning method and cleaning system of air heater |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106594777A (en) * | 2016-11-29 | 2017-04-26 | 无锡市锡源锅炉有限公司 | Self-cleaning boiler waste heat recovery device based on smoke pressure detection |
| CN110006186A (en) * | 2019-04-24 | 2019-07-12 | 珠海格力电器股份有限公司 | Cooling equipment and its control method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1036071A (en) * | 1988-03-24 | 1989-10-04 | 巴比考克威尔库克斯公司 | The soot blower of transposition |
| CN2511930Y (en) * | 2001-12-11 | 2002-09-18 | 李刚 | Self-clean air heat exchanger |
| CN201327345Y (en) * | 2008-11-25 | 2009-10-14 | 湖南大学 | High pressure water spray device |
| CN101706230A (en) * | 2009-11-23 | 2010-05-12 | 浪达科技（深圳）有限公司 | Soot blower |
| CN201488632U (en) * | 2009-08-06 | 2010-05-26 | 江苏核电有限公司 | Telescopic air duct of horizontal steam generator blowing device |
-
2010
- 2010-06-22 CN CN2010102152123A patent/CN102297633A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1036071A (en) * | 1988-03-24 | 1989-10-04 | 巴比考克威尔库克斯公司 | The soot blower of transposition |
| CN2511930Y (en) * | 2001-12-11 | 2002-09-18 | 李刚 | Self-clean air heat exchanger |
| CN201327345Y (en) * | 2008-11-25 | 2009-10-14 | 湖南大学 | High pressure water spray device |
| CN201488632U (en) * | 2009-08-06 | 2010-05-26 | 江苏核电有限公司 | Telescopic air duct of horizontal steam generator blowing device |
| CN101706230A (en) * | 2009-11-23 | 2010-05-12 | 浪达科技（深圳）有限公司 | Soot blower |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106594777A (en) * | 2016-11-29 | 2017-04-26 | 无锡市锡源锅炉有限公司 | Self-cleaning boiler waste heat recovery device based on smoke pressure detection |
| CN110006186A (en) * | 2019-04-24 | 2019-07-12 | 珠海格力电器股份有限公司 | Cooling equipment and its control method |
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| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE GRID CORPORATION OF CHINA Effective date: 20121228 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20121228 Address after: 100045 Beijing Fuxingmenwai Di Zang an Nan Xiang No. Applicant after: North China Electrical Power Research Institute LLC Applicant after: State Grid Corporation of China Address before: 100045 Beijing Fuxingmenwai Di Zang an Nan Xiang No. Applicant before: North China Electrical Power Research Institute LLC |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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Application publication date: 20111228 |