CN110094752A - A kind of automatic control air preheater sealing and anti-blocking system and control method - Google Patents
A kind of automatic control air preheater sealing and anti-blocking system and control method Download PDFInfo
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- CN110094752A CN110094752A CN201910457691.0A CN201910457691A CN110094752A CN 110094752 A CN110094752 A CN 110094752A CN 201910457691 A CN201910457691 A CN 201910457691A CN 110094752 A CN110094752 A CN 110094752A
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- air
- pressure
- air preheater
- signal
- temperature
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- 238000007789 sealing Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 25
- 210000004907 gland Anatomy 0.000 claims abstract description 20
- 238000002347 injection Methods 0.000 claims abstract description 20
- 239000007924 injection Substances 0.000 claims abstract description 20
- 239000007789 gas Substances 0.000 claims abstract description 9
- 230000008676 import Effects 0.000 claims abstract description 4
- 238000005259 measurement Methods 0.000 claims description 12
- 239000003546 flue gas Substances 0.000 claims description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 abstract description 7
- 239000007788 liquid Substances 0.000 abstract description 6
- WWILHZQYNPQALT-UHFFFAOYSA-N 2-methyl-2-morpholin-4-ylpropanal Chemical compound O=CC(C)(C)N1CCOCC1 WWILHZQYNPQALT-UHFFFAOYSA-N 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 239000000428 dust Substances 0.000 abstract description 4
- 239000003517 fume Substances 0.000 abstract description 4
- 239000003245 coal Substances 0.000 abstract description 3
- 238000013517 stratification Methods 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000010926 purge Methods 0.000 abstract 1
- 230000007613 environmental effect Effects 0.000 description 3
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F9/00—Use of air currents for screening, e.g. air curtains
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F11/00—Arrangements for sealing leaky tubes and conduits
-
- 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 kind of sealing of automatic control air preheater and anti-blocking systems and control method, including compressed air system, heating device, sealing gland injection apparatus, automatic control system.The pressure-air that compressed air system generates enters heating device and is heated, high temperature, pressure-air after heating import sealing gland injection apparatus, high temperature, high pressure air curtain are formed at air preheater cold and hot end fanning strip, air is prevented to leak to fume side, reduce air preheater air leakage；High temperature, pressure-air further to air preheater heat exchange element inside, make ammonium hydrogen sulfate is heated to be changed into gaseous state by liquid, and purge to dust stratification, achieve the purpose that reduce air preheater air leakage and prevent air preheater from blocking.This system can effectively reduce air preheater air leakage, prevents air preheater blocking, corrosion, improves air preheater exchange capability of heat, reduce exhaust gas temperature, improve boiler efficiency, reduce unit coal consumption, has preferable economic benefit.
Description
[technical field]
The invention belongs to thermal power plant energy conservation and environmental protection, it is related to a kind of automatic control air preheater sealing and anti-blocking is
System and control method.
[background technique]
Air needed for air preheater heats burning using the heat in boiler smoke, reaching reduces exhaust gas temperature, improves
The purpose of supply air temperature, air preheater have become the essential important component of present large-sized station boiler.It is rotary empty pre-
Device has many advantages, such as that compact-sized, metal consumption is few, light-weight, flexible arrangement, is widely used in high parameter, large capacity power station pot
On furnace.
There are certain gap, fume side and air sides to deposit between the rotor and static shell of rotary regenerative air heater rotation
In larger pressure difference, air is leaked by the seal clearance between dynamic and static by the lateral fume side of air, and air preheater rotor is hanging down
There is very big temperature gradient in histogram, hot end swell increment is greater than cold end upwards, cause rotor in hot operation in " mushroom "
Deformation thereby results in the raising of air preheater air leakage rate, causes heat loss due to exhaust gas to increase, boiler efficiency reduces, the raising of blower consumption rate.
As to the increasingly stringent of environmental protection requirement, coal-fired plant flue gas denitration has become coal-burning power plant's environmental protection work at present
The emphasis of work.For the requirement for meeting ultra-clean discharge transformation, at present overwhelming majority Installation in Plant selective catalytic reduction (SCR) denitration
Device, under the action of catalyst, by SO in flue gas2To SO3Conversion ratio increase, SO3With the NH of denitrating system escape3Reaction, it is raw
At ammonium hydrogen sulfate.Gaseous state, liquid, solid-state is presented in hydrogen sulfate ammonia respectively at different temperature, for coal unit, flies in flue gas
Ash content is higher, and hydrogen sulfate ammonia is liquid in 146 DEG C of -207 DEG C of temperature ranges.Low-temperature zone is exactly in this temperature in air preheater
Section is spent, liquid sulfuric acid hydrogen ammonia capture flying dust is very competent, combines with the fly ash particle in flue gas, is attached to preheater heat transfer
The dust stratification for melting salt shape is formed on element, and air preheater burn into is caused to block.Air preheater blocking increases air preheater air leakage rate, reduces
Air preheater exchange capability of heat, causes exhaust gas temperature to increase, and blower consumption rate increases, or even causes fan stall, influences unit band
Load-bearing capacity seriously affects unit safety, stabilization, economical operation.
To reduce air preheater air leakage, prevents air preheater from blocking, guarantee that air preheater is safe and efficient, economical operation, at present urgently
A kind of effective air preheater sealing and anti-block apparatus.
[summary of the invention]
It is an object of the invention to overcome the above-mentioned prior art, a kind of automatic control air preheater sealing and anti-is provided
Stifled system and control method, the device can be effectively reduced air preheater air leakage, prevent air preheater blocking, corrosion, improve empty pre-
Device exchange capability of heat reduces exhaust gas temperature, improves boiler efficiency, reduces unit coal consumption, has preferable economic benefit.
In order to achieve the above objectives, the present invention is achieved by the following scheme:
It is a kind of to automatically control air preheater sealing and anti-blocking system, including compressed air cylinder, and to be arranged in air preheater cold
Sealing gland injection apparatus between end and hot end two seals piece leads to after the heated device heating of the high pressure gas of compressed air cylinder
Overcompression air pipe line is delivered to sealing gland injection apparatus；The compressed air hose road is disposed with adjuster, sealing gland injection apparatus
On air leak rate of air curtain measuring device and resistance measurement apparatus are installed, the two inputs to the signal of measurement at signal processor
Reason obtains to guarantee air preheater sealing and anti-blocking compressed air temperature and pressure signal, and is converted into control signal output
It is adjusted to heating device, adjuster.
A further improvement of the present invention lies in that:
Temperature, pressure and flow value are exported electron control unit by signal processor, and electronic control unit is according to temperature
Degree, pressure and flow value generate the control signal of heating device and adjuster.
Compressed air hose road between adjuster and sealing gland injection apparatus is additionally provided with temperature/pressure measuring device, temperature
Collected real-time pressure and temperature signal are fed back to electronic control unit and realize feedback control by degree/device for pressure measurement.
Sealing gland injection apparatus includes six pieces of fanning strips, is provided with slit among every piece of fanning strip, is disposed with nozzle in slit,
Inside sets guiding device.
Nozzle strip.
Nozzle area accounts for 1/3~1/2 storehouse lattice in rotor through flow face.
Every piece of fanning strip is connected by branch with compressed air line.
Heating device uses surface heater, and heat source is one of electricity, hot wind, flue gas or steam or a variety of groups
It closes, by adjusting heat source, compressed air temperature can be controlled at 220 DEG C~320 DEG C.
A kind of control method automatically controlling air preheater sealing and anti-blocking system, comprising the following steps:
Step 1: the pressure-air that compressed air cylinder generation pressure is 0.2MPa~1.5MPa enters heating device and is added
Compressed air is heated to 220 DEG C -320 DEG C by heat；
Step 2: high temperature, pressure-air after heating import sealing gland injection apparatus, in air preheater cold and hot end fanning strip
Place forms high temperature, high pressure air curtain, and three seals are collectively formed with two seals piece；
Step 3: air leak rate of air curtain measuring device and resistance measurement apparatus real-time measurement air preheater air leakage rate signal S1 and air preheater
Resistance signal S2, and air preheater air leakage rate signal S1 and air preheater resistance signal S2 are input in signal processor, at signal
For reason device by handling input signal, output guarantees air preheater sealing and anti-blocking compressed air temperature and pressure signal
D1；
Step 4: temperature and pressure signal D1 is input to electronic control unit by signal processor, and control heating device is adjusted
Save device, adjustment compressed air temperature, pressure and flow.
Itself further improvement is that
Temperature/pressure measuring device is fed back to using the compressed air temperature of actual measurement and pressure signal S3 as feedback signal
Electronic control unit realizes feedback control.
Compared with prior art, the invention has the following advantages:
The present invention forms air curtain using the compressed air of high temperature, high pressure at fanning strip, effectively prevents air to fume side
Leakage.High temperature, pressure-air further to air preheater heat exchange element inside, make ammonium hydrogen sulfate is heated to be changed into gas by liquid
State, and dust stratification is purged, prevent air preheater from blocking.Sealing gland injection apparatus of the present invention be arranged in two seals piece it
Between, the three seals that hermetic seal forms with together with by twice mechanical seal are formed, the mushroom deformation of rotor can be effectively adapted to, and
Reduce the abrasion of fanning strip and diaphragm seal.The present invention has the function of automatically controlling, according to air preheater resistance, air leak rate of air curtain, automatically
Compressed air temperature, pressure, flow are adjusted, is realized to air preheater sealing and anti-blocking closed-loop control.
[Detailed description of the invention]
Fig. 1 is the sealing of automatic control air preheater and anti-block apparatus schematic diagram that coal-burning power plant of the embodiment of the present invention uses.
Wherein: 1- compressed air cylinder；2- heating device；3- adjuster；4- temperature/pressure measuring device；5- electronic control
Unit；6- signal processor；7- air leak rate of air curtain measuring device；8- resistance measurement apparatus；9- sealing gland injection apparatus.
[specific embodiment]
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, the embodiment being not all of, and it is not intended to limit range disclosed by the invention.In addition, with
In lower explanation, descriptions of well-known structures and technologies are omitted, obscures concept disclosed by the invention to avoid unnecessary.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment should fall within the scope of the present invention.
The various structural schematic diagrams for disclosing embodiment according to the present invention are shown in the attached drawings.These figures are not in proportion
It draws, wherein some details are magnified for the purpose of clear expression, and some details may be omitted.As shown in the figure
The shape in various regions, layer and relative size, the positional relationship between them out is merely exemplary, in practice may be due to
Manufacturing tolerance or technical restriction and be deviated, and those skilled in the art may be additionally designed as required have not
Similar shape, size, the regions/layers of relative position.
In context disclosed by the invention, when one layer/element is referred to as located at another layer/element "upper", the layer/element
Can may exist intermediate layer/element on another layer/element or between them.In addition, if in a kind of court
One layer/element is located at another layer/element "upper" in, then when turn towards when, the layer/element can be located at another layer/
Element "lower".
It should be noted that description and claims of this specification and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so as to the embodiment of the present invention described herein can in addition to illustrating herein or
Sequence other than those of description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that cover
Cover it is non-exclusive include, for example, the process, method, system, product or equipment for containing a series of steps or units are not necessarily limited to
Step or unit those of is clearly listed, but may include be not clearly listed or for these process, methods, product
Or other step or units that equipment is intrinsic.
The invention will be described in further detail with reference to the accompanying drawing:
Referring to Fig. 1, present invention automatic control air preheater sealing and anti-block apparatus, including compressed air cylinder 1, heating device 2,
Adjuster 3, temperature/pressure measuring device 4, electronic control unit 5, signal processor 6, air leak rate of air curtain measuring device 7, drag measurement
Device 8, sealing gland injection apparatus 9.
Compressed air cylinder 1 is used to generate the pressure-air of compression, and pressure-air enters heating device 2 and heated, will be pressed
Contracting air is heated to 220 DEG C -320 DEG C, and high temperature after heating, pressure-air import sealing gland injection apparatus 9, in air preheater cold end and
High temperature, high pressure air curtain are formed at the fanning strip of hot end, three seals are collectively formed with two seals piece, effectively prevent air to flue gas
Side leakage, reduces air preheater air leakage.
High temperature, pressure-air further to air preheater heat exchange element inside, it is heated, ammonium hydrogen sulfate gas is reached
Change temperature, ammonium hydrogen sulfate is changed into gaseous state by liquid, and exchanges thermal element inner product ash and purged, air preheater resistance is reduced,
Prevent air preheater from blocking.
Heating device 2 is surface heater, and electricity, hot wind, flue gas, steam can be used in heat source, is heated by adjusting
Heat source controls compressed air temperature at 220 DEG C~320 DEG C.
Sealing gland injection apparatus 9 is arranged at air preheater cold and hot end fanning strip between two seals piece, among fanning strip
It is slotted, arrange strip nozzle, inside sets guiding device, and nozzle area accounts for 1/3~1/2 storehouse lattice in rotor through flow face.Compression
Adjuster, temperature/pressure measuring device are arranged on air pipe line, and are divided into six branches before entering sealing gland injection apparatus.
Air preheater air leakage rate signal S1 and air preheater resistance letter are obtained by air leak rate of air curtain measuring device 7, resistance measurement apparatus 8
Number S2, is input in signal processor 6, and signal processor 6 handles input signal, and output guarantees air preheater sealing and anti-
Stifled compressed air temperature and pressure signal D1, and by treated, signal is input to electronic control unit 5, controls heating device
2, adjuster 3, adjust compressed air temperature, pressure, flow, the compressed air temperature that temperature/pressure measuring device 4 is surveyed and
Pressure signal S3 is as feedback signal, to realize feedback control, realizes and is precisely controlled to air preheater sealing with anti-blocking.
The input signal of control system of the present invention is air preheater resistance and air leak rate of air curtain, and output signal is to guarantee air preheater sealing
With anti-blocking compressed air temperature and pressure, heating device 2, adjuster 3, adjustment compressed air temperature, pressure and stream are controlled
Amount reduces system energy consumption under the conditions of guaranteeing air preheater sealing and good resistance.
The above content is merely illustrative of the invention's technical idea, and this does not limit the scope of protection of the present invention, all to press
According to technical idea proposed by the present invention, any changes made on the basis of the technical scheme each falls within claims of the present invention
Protection scope within.
Claims (10)
1. a kind of automatically control air preheater sealing and anti-blocking system, which is characterized in that including compressed air cylinder (1), Yi Jibu
The sealing gland injection apparatus (9) being placed between air preheater cold and hot end two seals piece, the high pressure gas warp of compressed air cylinder (1)
After heating devices heat, sealing gland injection apparatus (9) are delivered to by compressed air line；The compressed air hose road is disposed with
Adjuster (3), air leak rate of air curtain measuring device (7) and resistance measurement apparatus (8) are equipped on sealing gland injection apparatus (9), and the two will be surveyed
The signal of amount inputs to signal processor (6) and is handled, and obtains to guarantee air preheater sealing and anti-blocking compressed air temperature
Degree and pressure signal, and be converted into control signal and export to heating device (2), adjuster (3) and be adjusted.
2. according to claim 1 automatically control air preheater sealing and anti-blocking system, which is characterized in that signal processor
(6) by temperature, pressure and flow value export electron control unit (5), electronic control unit (5) according to temperature, pressure with
And flow value generates the control signal of heating device (2) and adjuster (3).
3. according to claim 2 automatically control air preheater sealing and anti-blocking system, which is characterized in that adjuster (3)
Compressed air hose road between sealing gland injection apparatus (9) is additionally provided with temperature/pressure measuring device (4), and temperature/pressure is surveyed
Collected real-time pressure and temperature signal are fed back to electronic control unit (5) and realize feedback control by amount device (4).
4. according to claim 1 automatically control air preheater sealing and anti-blocking system, which is characterized in that sealing gland injection dress
Setting (9) includes six pieces of fanning strips, is provided with slit among every piece of fanning strip, nozzle is disposed in slit, inside sets guiding device.
5. according to claim 4 automatically control air preheater sealing and anti-blocking system, which is characterized in that nozzle strip
Shape.
6. according to claim 4 or 5 automatically control air preheater sealing and anti-blocking system, which is characterized in that nozzle face
Product accounts for 1/3~1/2 storehouse lattice in rotor through flow face.
7. according to claim 4 or 5 automatically control air preheater sealing and anti-blocking system, which is characterized in that every piece of fan
Shape plate is connected by branch with compressed air line.
8. according to claim 1 automatically control air preheater sealing and anti-blocking system, which is characterized in that heating device
(2) surface heater is used, heat source is one of electricity, hot wind, flue gas or steam or multiple combinations, is added by adjusting
Heat source can control compressed air temperature at 220 DEG C~320 DEG C.
9. a kind of control method of system described in claim 1-8 any one, which comprises the following steps:
Step 1: compressed air cylinder (1) generates the pressure-air that pressure is 0.2MPa~1.5MPa and enters heating device (2) progress
Heating, is heated to 220 DEG C -320 DEG C for compressed air；
Step 2: high temperature, pressure-air after heating import sealing gland injection apparatus (9), at air preheater cold and hot end fanning strip
High temperature, high pressure air curtain are formed, three seals are collectively formed with two seals piece；
Step 3: air leak rate of air curtain measuring device (7) and resistance measurement apparatus (8) real-time measurement air preheater air leakage rate signal S1 and sky are pre-
Device resistance signal S2, and air preheater air leakage rate signal S1 and air preheater resistance signal S2 are input in signal processor (6), believe
By handling input signal, output guarantees air preheater sealing and anti-blocking compressed air temperature and pressure for number processor (6)
Force signal D1；
Step 4: temperature and pressure signal D1 is input to electronic control unit (5) by signal processor (6), controls heating device
(2), adjuster (3), adjustment compressed air temperature, pressure and flow.
10. control method according to claim 9, which is characterized in that temperature/pressure measuring device (4) is by the pressure of actual measurement
Contracting air themperature and pressure signal S3 feed back to electronic control unit (5) and realize feedback control as feedback signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910457691.0A CN110094752A (en) | 2019-05-29 | 2019-05-29 | A kind of automatic control air preheater sealing and anti-blocking system and control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910457691.0A CN110094752A (en) | 2019-05-29 | 2019-05-29 | A kind of automatic control air preheater sealing and anti-blocking system and control method |
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Family
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| CN111013377A (en) * | 2019-11-19 | 2020-04-17 | 华电电力科学研究院有限公司 | Independently adjustable anti-blocking structure and method for four-bin air preheater |
| CN113339836A (en) * | 2021-06-09 | 2021-09-03 | 国能宁夏大坝三期发电有限公司 | Sweeping device for heat storage element of rotary air preheater |
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|---|---|---|---|---|
| CN111013377A (en) * | 2019-11-19 | 2020-04-17 | 华电电力科学研究院有限公司 | Independently adjustable anti-blocking structure and method for four-bin air preheater |
| CN113339836A (en) * | 2021-06-09 | 2021-09-03 | 国能宁夏大坝三期发电有限公司 | Sweeping device for heat storage element of rotary air preheater |
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