CN206369221U - The leak control system of air preheater - Google Patents
The leak control system of air preheater Download PDFInfo
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- CN206369221U CN206369221U CN201621492644.8U CN201621492644U CN206369221U CN 206369221 U CN206369221 U CN 206369221U CN 201621492644 U CN201621492644 U CN 201621492644U CN 206369221 U CN206369221 U CN 206369221U
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- air preheater
- fanning strip
- air
- control system
- rotor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The utility model discloses a kind of leak control system of air preheater.The system includes：Rotor deformation detection means, is connected with air preheater, the deformation quantity of the rotor for detecting air preheater；Fanning strip lowering or hoisting gear, is connected with air preheater, and descending operation is carried out for the fanning strip to air preheater；Displacement detector, is connected with the fanning strip lowering or hoisting gear, the decentralization displacement for detecting fanning strip；Air leakage control cabinet, it is connected respectively with rotor deformation detection means, fanning strip lowering or hoisting gear and displacement detector, decentralization displacement for the deformation quantity according to rotor and fanning strip obtains the seal clearance value of air preheater, and controls fanning strip lowering or hoisting gear to run according to seal clearance value.The utility model solve air preheater of the prior art leak control system exist control accuracy it is relatively low, fragile and can not on-line maintenance technical problem.
Description
Technical field
The utility model is related to automation field, in particular to a kind of leak control system of air preheater.
Background technology
Rotary regenerative air preheater is widely used in large thermal power plant, is to reduce coal consumption, improve the weight of boiler thermal output
Want part.But, the rotor of rotary regenerative air preheater typically can produce the situation of leaking out because there is " mushroom " thermal deformation.
Situation of leaking out can not only increase exhaust gas heat loss and become estranged air-introduced machine power consumption, and can accelerate heated surface corrosion because cigarette temperature drop is low.When
When situation of leaking out is serious, it will cause to send into the air capacity deficiency that boiler participates in burning, so as to directly affect boiler output.
Leak control system be in order to solve air preheater rotor thermal deformation initiation Air Leakage and design it is a set of
Automatic following control system, it can be with the heat distortion amount of real-time tracking rotor, and then controls sector by fanning strip elevating mechanism
The up and down motion of plate so that seal clearance is maintained at zone of reasonableness.It is coal-fired that per kilowatt can be obviously reduced in leak control system
Consumption, improves unit operation efficiency.At present, leak control system of the prior art is typically passed using mechanical probe or current vortex
Sensor directly detects seal clearance, still, either mechanical probe or current vortex sensor, is required for being installed on air in advance
Inside preheater, and have that working environment is severe, service life is of short duration, can not on-line maintenance the defect such as change.To sum up, it is existing
Leak control system control accuracy with the presence of the air preheater in technology it is relatively low, fragile and can not on-line maintenance skill
Art problem.
For it is above-mentioned the problem of, effective solution is not yet proposed at present.
Utility model content
The utility model embodiment provides a kind of leak control system of air preheater, at least to solve prior art
In air preheater the control accuracy that exists of leak control system it is relatively low, fragile and can not the technology of on-line maintenance ask
Topic.
, should according to the one side of the utility model embodiment there is provided a kind of leak control system of air preheater
System includes：Rotor deformation detection means, is connected with air preheater, the deformation of the rotor for detecting above-mentioned air preheater
Amount；Fanning strip lowering or hoisting gear, is connected with above-mentioned air preheater, and lifting behaviour is carried out for the fanning strip to above-mentioned air preheater
Make；Displacement detector, is connected with above-mentioned fanning strip lowering or hoisting gear, the decentralization displacement for detecting above-mentioned fanning strip；Leak out control
Cabinet processed, is connected with above-mentioned rotor deformation detection means, above-mentioned fanning strip lowering or hoisting gear and upper displacement sensing device, is used for respectively
The seal clearance value of above-mentioned air preheater, and root are obtained according to the decentralization displacement of the deformation quantity of above-mentioned rotor and above-mentioned fanning strip
Above-mentioned fanning strip lowering or hoisting gear operation is controlled according to above-mentioned seal clearance value.
Further, above-mentioned Air leakage control cabinet includes：Computing circuit, respectively with above-mentioned rotor deformation detection means and above-mentioned
Displacement detector is connected, and it is pre- that the decentralization displacement for the deformation quantity according to above-mentioned rotor and above-mentioned fanning strip obtains above-mentioned air
The seal clearance value of hot device；First control circuit, is connected with above-mentioned computing circuit, for the sealing according to above-mentioned air preheater
Gap width and default seal clearance value scope generate the first control signal.
Further, said system also includes：Local control device, respectively with above-mentioned fanning strip lowering or hoisting gear and above-mentioned control
Circuit connection processed, for controlling above-mentioned fanning strip lowering or hoisting gear to run according to above-mentioned first control signal.
Further, said system also includes：Motor detection apparatus, respectively with above-mentioned air preheater and above-mentioned control of leaking out
Cabinet connection processed, for the current value and tachometer value of the motor for detecting above-mentioned air preheater.
Further, above-mentioned Air leakage control cabinet also includes：First decision circuitry, is connected with above-mentioned motor detection apparatus, uses
In judging the current value of above-mentioned motor whether within the scope of pre-set current value, so as to generate the first judged result；Second
Whether decision circuitry, is connected with above-mentioned motor detection apparatus, for judging the tachometer value of above-mentioned motor in preset rotation speed value
Within the scope of, so as to generate the second judged result；Second control circuit, sentences with above-mentioned first decision circuitry and above-mentioned second respectively
Deenergizing is connected, for generating the second control signal according to above-mentioned first judged result or above-mentioned second judged result, wherein, on
Stating the second control signal is used to indicate that above-mentioned local control device controls above-mentioned fanning strip lowering or hoisting gear to carry out above-mentioned fanning strip
Emergency lifting is operated.
Further, above-mentioned rotor deformation detection means is laser sensor or temperature sensor.
Further, above-mentioned laser sensor is arranged at the hot junction face truss of above-mentioned air preheater, said temperature sensing
Device is arranged at air inlet and the gas outlet of above-mentioned air preheater.
Further, above-mentioned rotor deformation detection means is connected with the hot junction face of above-mentioned air preheater.
Further, above-mentioned fanning strip lowering or hoisting gear is screw-threaded shaft elevator.
Further, reductor is provided with above-mentioned screw-threaded shaft elevator, for when above-mentioned screw-threaded shaft elevator is run, to upper
State screw-threaded shaft elevator and carry out deceleration-operation.
In the utility model embodiment, the leak control system of above-mentioned air preheater passes through rotor deformation detection means
Detect air preheater rotor deformation quantity, and by displacement detector detect air preheater fanning strip decentralization
Displacement, and then the air preheater is obtained according to the deformation quantity of the rotor and the decentralization displacement of the fanning strip by Air leakage control cabinet
Seal clearance value, the purpose for controlling fanning strip lowering or hoisting gear to run according to the seal clearance value has been reached, it is achieved thereby that carrying
The technique effect of the control efficiency of the leak control system of lift-off air preheater, is also achieved to the effective control of air preheater
On the premise of reduce the air leak rate of air curtain of air preheater and improve the technique effect of its efficiency of combustion, and then solve prior art
In air preheater the control accuracy that exists of leak control system it is relatively low, fragile and can not the technology of on-line maintenance ask
Topic.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding to of the present utility model, constitutes the part of the application,
Schematic description and description of the present utility model is used to explain the utility model, does not constitute to of the present utility model improper
Limit.In the accompanying drawings：
Fig. 1 is that a kind of structure of the leak control system of optional air preheater according to the utility model embodiment is shown
It is intended to；
Fig. 2 is the structure of the leak control system of another optional air preheater according to the utility model embodiment
Schematic diagram.
Embodiment
In order that those skilled in the art more fully understand the utility model scheme, it is real below in conjunction with the utility model
The accompanying drawing in example is applied, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that described
Embodiment is only the embodiment of the utility model part, rather than whole embodiments.Based on the reality in the utility model
Example is applied, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made all should
When the scope for belonging to the utility model protection.
It should be noted that term " first " in specification and claims of the present utility model and above-mentioned accompanying drawing,
" second " etc. is for distinguishing similar object, without for describing specific order or precedence.
According to the utility model embodiment there is provided a kind of embodiment of the leak control system of air preheater, Fig. 1 is
According to a kind of structural representation of the leak control system of optional air preheater of the utility model embodiment, such as Fig. 1 institutes
Show, the leak control system of the air preheater includes：
Rotor deformation detection means 101, is connected with air preheater 103, the shape of the rotor for detecting air preheater
Variable；Fanning strip lowering or hoisting gear 105, is connected with air preheater 103, is risen for the fanning strip to air preheater 103
Drop operation；Displacement detector 107, is connected with fanning strip lowering or hoisting gear 105, the decentralization displacement for detecting fanning strip；Leak out
Switch board 109, is connected with rotor deformation detection means 101, fanning strip lowering or hoisting gear 105 and displacement detector 107 respectively, uses
The seal clearance value of air preheater 103 is obtained in the decentralization displacement of the deformation quantity according to rotor and fanning strip, and according to sealing
Gap width control fanning strip lowering or hoisting gear 105 is run.
Alternatively, in the utility model embodiment, the leak control system of above-mentioned air preheater passes through rotor deformation
The deformation quantity of the rotor of detection means detection air preheater, and pass through the sector of displacement detector detection air preheater
The decentralization displacement of plate, and then the sky is obtained according to the deformation quantity of the rotor and the decentralization displacement of the fanning strip by Air leakage control cabinet
The seal clearance value of air preheater, has reached the purpose for controlling fanning strip lowering or hoisting gear to run according to the seal clearance value, so that
The technique effect of the control efficiency of the leak control system of lifting air preheater is realized, is also achieved to air preheater
The air leak rate of air curtain of air preheater is effectively reduced on the premise of control and the technique effect of its efficiency of combustion is improved, and then solved
The control accuracy that the leak control system of air preheater of the prior art is present is relatively low, fragile and can not on-line maintenance
Technical problem.
Alternatively, air preheater (air pre-heater) is commonly abbreviated as air preheater, by boiler back end ductwork
The air preheat that will be entered before boiler by internal fin of flue gas to certain temperature heating surface, for improving boiler
Heat exchange performance, reduces energy expenditure.It is used for coal-fired power station boiler.Air preheater can be divided into two kinds of box type, swinging,
Wherein swinging is divided into two kinds of fan housing swinging and heating surface swinging again.Station boiler is preheated compared with frequently with heating surface swinging
Device.The generally Liang Fencang of application in the boiler, San Fencang, four warehouse separated types, wherein four points of storehouses are more common in recirculating fluidized bed pot
In stove.
Alternatively, the leak control system of the air preheater in the embodiment of the present application can be used for the revolution of control thermal power plant
Regenerative air heater.Specifically, the widely used air preheater of station boiler has two kinds of tubular type and swinging.Swinging air
Preheater transmits heat with regeneration, and flue gas alternately passes through heating surface with air.When flue gas flows through, heat is transmitted to from flue gas
Heating surface, the rise of heating surface temperature, and put aside heat；When air is again passed through, heating surface puts the heat of savings to air.
Alternatively, the Air leakage control cabinet can be controlled by integrated circuit to air preheater, can also be by can
Programmed logic controller is controlled to air preheater.Specifically, programmable logic controller (PLC) (Programmable Logic
Controller, abbreviation PLC) it is a kind of using a class programmable memory, for its internally stored program, execution logic fortune
The user oriented instruction such as calculation, sequential control, timing, counting and arithmetical operation, and pass through numeral or analog pattern input/output control
The various types of machineries of system or production process.
Alternatively, seal clearance is directly generally detected using mechanical probe or current vortex sensor in the prior art, this Shen
Seal clearance please be detected using a kind of indirect mode, under the deformation quantity and fanning strip of rotor that air preheater is detected first
Displacement is put, and then by the decentralization displacement of the deformation quantity and fanning strip that calculate the rotor, so as to obtain accurate seal clearance, is needed
It is noted that the deformation quantity of the rotor is produced by the thermal deformation of rotor.Therefore, the mode of seal clearance is obtained in the application
Accuracy is higher, testing cost is lower, can be widely applied to industry spot.
Alternatively, the Air leakage control cabinet can include：Computing circuit, respectively with rotor deformation detection means and displacement detecting
Device is connected, and the decentralization displacement for the deformation quantity according to rotor and fanning strip obtains the seal clearance value of air preheater；The
One control circuit, is connected with computing circuit, for the seal clearance value according to air preheater and default seal clearance value scope
Generate the first control signal.
Specifically, multiple circuit comparators can be provided with first control circuit, for the seal clearance value and in advance
If the maximum in seal clearance value scope is compared, or for the seal clearance value and default seal clearance value scope
In minimum value be compared so that according to above-mentioned comparative result generate the first control signal.
Alternatively, the system can also include：Local control device, connects with fanning strip lowering or hoisting gear and control circuit respectively
Connect, for controlling fanning strip lowering or hoisting gear to run according to the first control signal.Specifically, local control device is alternatively referred to as on the spot
Operation device, it can possess independent computer disposal and control function, and it independently can be carried out to fanning strip lowering or hoisting gear
Control, can also coordinate Air leakage control cabinet to jointly control fanning strip lowering or hoisting gear, the control priority that jointly controls or
Control sequence can be taking human as being pre-set, and the application is not limited herein.Local control device can be according to the first control signal
The operation of fanning strip lowering or hoisting gear is controlled, so that the seal clearance of air preheater is maintained within preset range, is realized optimal
Hot junction radial seal gap.
Alternatively, the system can also include：Motor detection apparatus, connects with air preheater and Air leakage control cabinet respectively
Connect, for the current value and tachometer value of the motor for detecting air preheater.
Alternatively, the Air leakage control cabinet can also include：First decision circuitry, is connected with motor detection apparatus, for sentencing
Whether the current value of disconnected motor is within the scope of pre-set current value, so as to generate the first judged result；Second decision circuitry,
It is connected with motor detection apparatus, for judging the tachometer value of motor whether within the scope of preset rotation speed value, so as to generate
Second judged result；Second control circuit, is connected with the first decision circuitry and the second decision circuitry respectively, for sentencing according to first
Disconnected result or the second judged result generate the second control signal, wherein, the second control signal is used to indicate local control device control
Fanning strip lowering or hoisting gear processed carries out emergency lifting operation to fanning strip.
Specifically, when the current anomaly or abnormal rotating speed of the motor of air preheater, by being carried out to fanning strip
Emergency lifting is operated, and can ensure the security of the leak control system of air preheater, the failure hair of reduction air preheater
Raw rate, extends the service life of air preheater.
Alternatively, rotor deformation detection means is laser sensor or temperature sensor.
Specifically, laser sensor is arranged at the hot junction face truss of air preheater, and is directed at rotor by being oriented to steel pipe
Angle steel.Temperature sensor be arranged at air preheater air inlet and gas outlet, it is necessary to explanation, the air inlet can be cigarette
The air inlet of gas and/or air, the gas outlet can be the gas outlet of flue gas and/or air.
Specifically, laser sensor is the sensor measured using laser technology.It is by laser, laser detector
With measuring circuit composition.Laser sensor is new type measuring instrument table, it possess contactless telemeasurement, speed is fast, precision is high,
The advantages of range is big, anti-light, electrical interference ability is strong, laser sensor can directly detect the deformation of the rotor of air preheater
Amount.Temperature sensor (temperature transducer) refers to that temperature can be experienced and is converted into the sensing of usable output signal
Device.Temperature sensor is the core of temperature measuring instrument, various in style, and it can be divided into contact by metering system and non-connect
The major class of touch two, is divided into thermal resistance and the class of thermocouple two according to sensor material and electron component characteristic.
It should be noted that the rotor deformation detection means in the application without being installed on the interior of air preheater in advance
Portion, its is with low cost, simple to operate and detection efficiency is higher, so as to overcome tradition machinery probe or current vortex sensor to need
Be installed on inside air preheater, working environment is severe, service life is short, can not on-line maintenance the shortcomings of change, therefore, the application
In rotor deformation detection means be more suitable for industry spot.
Alternatively, the hot junction face connection of rotor deformation detection means and air preheater.
Alternatively, the system can also include：External AC power supply, is connected with Air leakage control cabinet, for Air leakage control
Cabinet is powered.Specifically, the external AC power supply can be that rated voltage can be 220V, and rated current is that 10A, rated frequency are
50Hz AC power.
Alternatively, the fanning strip lowering or hoisting gear is screw-threaded shaft elevator.Screw-threaded shaft elevator has compact conformation, small volume, again
Amount is light, power source is extensive, noise is small, it is easy for installation, using flexible, function is more, kit form is more, reliability is high, service life
Long the advantages of.It can be controlled the height that adjustment is lifted or promoted exactly by certain procedures, can also use motor or other dynamic
Power directly drives, can also be manually.Structural shape, assembling mode, gearratio, hoisting depth of the screw-threaded shaft elevator etc. are herein not
It is limited, the screw-threaded shaft elevator can also possess auto-lock function.
Alternatively, reductor is provided with the screw-threaded shaft elevator, for when screw-threaded shaft elevator is run, to screw-threaded shaft elevator
Carry out deceleration-operation.Specifically, reductor plays matching rotating speed and transmission torque between prime mover and working machine or executing agency
Effect, reductor is a kind of accurate machinery relatively, the use of its purpose is reduction rotating speed, increases torque.
Alternatively, Fig. 2 is the Air leakage control system of another optional air preheater according to the utility model embodiment
The structural representation of system, as shown in Fig. 2 the Air leakage control cabinet 20 can control one or more air preheaters simultaneously (in Fig. 2
Air preheater 201 and air preheater 202), each air preheater is equipped with a set of independent detection means and control
Device, wherein, detection means includes displacement detector 203, laser sensor 204, temperature sensor 205 etc., control device
Including local control device 206 and fanning strip lowering or hoisting gear 207 etc..There can be instrument on the Air leakage control cabinet and local control device
The parts such as dial plate, indicator lamp, button, for realizing that the current operating state of the leak control system shows, alerted, instructed
The functions such as input.
Alternatively, in the utility model embodiment, the leak control system of above-mentioned air preheater passes through rotor deformation
The deformation quantity of the rotor of detection means detection air preheater, and pass through the sector of displacement detector detection air preheater
The decentralization displacement of plate, and then the sky is obtained according to the deformation quantity of the rotor and the decentralization displacement of the fanning strip by Air leakage control cabinet
The seal clearance value of air preheater, has reached the purpose for controlling fanning strip lowering or hoisting gear to run according to the seal clearance value, so that
The technique effect of the control efficiency of the leak control system of lifting air preheater is realized, is also achieved to air preheater
The air leak rate of air curtain of air preheater is effectively reduced on the premise of control and the technique effect of its efficiency of combustion is improved, and then solved
The control accuracy that the leak control system of air preheater of the prior art is present is relatively low, fragile and can not on-line maintenance
Technical problem.
Described above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art
For art personnel, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these improve and
Retouching also should be regarded as protection domain of the present utility model.
Claims (10)
1. a kind of leak control system of air preheater, it is characterised in that including：
Rotor deformation detection means, is connected with air preheater, the deformation quantity of the rotor for detecting the air preheater；
Fanning strip lowering or hoisting gear, is connected with the air preheater, is lifted for the fanning strip to the air preheater
Operation；
Displacement detector, is connected with the fanning strip lowering or hoisting gear, the decentralization displacement for detecting the fanning strip；
Air leakage control cabinet, is filled with the rotor deformation detection means, the fanning strip lowering or hoisting gear and the displacement detecting respectively
Connection is put, the decentralization displacement for the deformation quantity according to the rotor and the fanning strip obtains the sealing of the air preheater
Gap width, and control the fanning strip lowering or hoisting gear to run according to the seal clearance value.
2. the leak control system of air preheater according to claim 1, it is characterised in that the Air leakage control cabinet bag
Include：
Computing circuit, is connected with the rotor deformation detection means and institute's displacement sensing device respectively, for being turned according to described
The decentralization displacement of the deformation quantity and the fanning strip of son obtains the seal clearance value of the air preheater；
First control circuit, is connected with the computing circuit, for the seal clearance value according to the air preheater and default
Seal clearance value scope generates the first control signal.
3. the leak control system of air preheater according to claim 2, it is characterised in that the system also includes：
Local control device, is connected with the fanning strip lowering or hoisting gear and the control circuit, for according to described first respectively
Control signal controls the fanning strip lowering or hoisting gear operation.
4. the leak control system of air preheater according to claim 3, it is characterised in that the system also includes：
Motor detection apparatus, is connected with the air preheater and the Air leakage control cabinet, for detecting that the air is pre- respectively
The current value and tachometer value of the motor of hot device.
5. the leak control system of air preheater according to claim 4, it is characterised in that the Air leakage control cabinet is also
Including：
Whether the first decision circuitry, is connected with the motor detection apparatus, for judging the current value of the motor pre-
If within current value range, so as to generate the first judged result；
Whether the second decision circuitry, is connected with the motor detection apparatus, for judging the tachometer value of the motor pre-
If within tacho value range, so as to generate the second judged result；
Second control circuit, is connected with first decision circuitry and second decision circuitry respectively, for according to described
One judged result or second judged result generate the second control signal, wherein, second control signal is used to indicate institute
Stating local control device controls the fanning strip lowering or hoisting gear to carry out emergency lifting operation to the fanning strip.
6. the leak control system of air preheater according to claim 1, it is characterised in that the rotor deformation detection
Device is laser sensor or temperature sensor.
7. the leak control system of air preheater according to claim 6, it is characterised in that the laser sensor is set
The hot junction face truss of the air preheater is placed in, the temperature sensor is arranged at the air inlet of the air preheater and gone out
Gas port.
8. the leak control system of air preheater according to claim 1, it is characterised in that the rotor deformation detection
Device is connected with the hot junction face of the air preheater.
9. the leak control system of air preheater according to claim 1, it is characterised in that the fanning strip lifting dress
It is set to screw-threaded shaft elevator.
10. the leak control system of air preheater according to claim 9, it is characterised in that the screw-threaded shaft elevator
On be provided with reductor, for when the screw-threaded shaft elevator is run, deceleration-operation is carried out to the screw-threaded shaft elevator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621492644.8U CN206369221U (en) | 2016-12-30 | 2016-12-30 | The leak control system of air preheater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621492644.8U CN206369221U (en) | 2016-12-30 | 2016-12-30 | The leak control system of air preheater |
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| CN206369221U true CN206369221U (en) | 2017-08-01 |
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ID=59390381
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106594789A (en) * | 2016-12-30 | 2017-04-26 | 中国华能集团清洁能源技术研究院有限公司 | Air leakage control system of air preheater |
-
2016
- 2016-12-30 CN CN201621492644.8U patent/CN206369221U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106594789A (en) * | 2016-12-30 | 2017-04-26 | 中国华能集团清洁能源技术研究院有限公司 | Air leakage control system of air preheater |
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