CN204100893U - A kind of laser type air preheater air leak control system - Google Patents
A kind of laser type air preheater air leak control system Download PDFInfo
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- CN204100893U CN204100893U CN201420353692.3U CN201420353692U CN204100893U CN 204100893 U CN204100893 U CN 204100893U CN 201420353692 U CN201420353692 U CN 201420353692U CN 204100893 U CN204100893 U CN 204100893U
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- laser
- fanning strip
- air preheater
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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 provides a kind of laser type air preheater air leak control system.This system comprises: laser sensor, for detecting the rotor deformation amount of air preheater; Displacement Feedback device, for the voltage signal fed back according to rotating potentiometer, calculates the shift value of fanning strip; Control device, is connected with Displacement Feedback device with laser sensor, for receiving the shift value of rotor deformation amount and fanning strip and calculated gap value, and exports a drive control signal according to the comparative result of gap width and a prepsetting gap value; And fanning strip load maintainer, for promoting or fanning strip of loweing according to drive control signal.Compared to prior art, the utility model can utilize high-precision laser ranging technique to carry out detection rotor deformation quantity, and reach contactless by means of the high directivity of laser, the feature such as high monochromaticity and high brightness, telemeasurement, many effects that precision is high.
Description
Technical field
The utility model relates to a kind of heat-exchange device for boiler plant, particularly relates to a kind of laser type air preheater air leak control system.
Background technology
Boiler plant is one of the three large capital equipments in thermal power plant, and air preheater is one of vitals of boiler plant.Air preheater is a kind of heat-exchanging part, and it utilizes the flue-gas temperature of boiler tail to carry out heating boiler combustion air, thus the main waste heat in recovery boiler equipment.In air preheater, high-temperature flue gas heating energy-accumulating element, when Cryogenic air flows through energy-accumulating element takes away heat, to realize the object of preheated air.
In the prior art, the boiler plant of large-scale power station generally adopts rotary regenerative air preheater, when energy-accumulating element rotates with certain speed, its periodically with high-temperature flue gas and Cryogenic air heat exchange.Because the rotary motion of the energy-accumulating element (such as rotor) in rotary regenerative air preheater needs certain dynamic and static gaps, and the flue gas in rotary regenerative air preheater is in negative pressure state, and air is in barotropic state, therefore, have portion of air bleed flue gas and with flue gas discharge air preheater, affect the air leak rate of air curtain of air preheater.At this, air leak rate of air curtain refers to the percentage of the air duty air preheater inlet flue gas of the flue gas that bleeds, and it is the important indicator evaluating preheater performance, and when air leak rate of air curtain is excessive, the load of pressure fan and air-introduced machine and consumption rate increase, and have a strong impact on the normal operation of boiler.In addition, because expanding unevenly when the rotor in air preheater is heated, there is mushroom deformation, make to there is gap between fanning strip and rotor radial seal circle, gap is larger, the area that leaks out is larger thus air leak rate of air curtain is higher, in order to reduce leaking out of air preheater hot junction, must design a kind of high-precision sensor come between Real-Time Monitoring fanning strip and rotor radial seal circle gap change, to promote or to lower Sectorial sealplate in time, ensure that sound two parts of air preheater both can not be collided, gap is also unlikely excessive.
Current a solution adopts pure temp-controled mode, controls the gap between fanning strip and rotor radial seal circle by the detection rotor deformation amount corresponding with temperature.But this pattern exists Great inertia, purely retarded, many defects such as larger non-linear, affected by environment, control accuracy is poor.In view of this, how to design a kind of new air preheater air leak control system and control method thereof, or existing air-heater leakage design is improved, to eliminate existing above-mentioned defect, be the problem that person skilled is urgently to be resolved hurrily in the industry.
Utility model content
Above-mentioned defect existing when controlling for air-heater leakage of the prior art, that the utility model provides a kind of novelty, that there is good stability and control accuracy laser type air preheater air leak control system.
According to an aspect of the present utility model, provide a kind of laser type air preheater air leak control system, be suitable for automatically controlling the gap between fanning strip and rotor angle steel plane, comprise:
Laser sensor, for detecting the rotor deformation amount of described air preheater;
Displacement Feedback device, for the voltage signal fed back according to rotating potentiometer, calculates the shift value of described fanning strip;
Control device, be connected with described Displacement Feedback device with described laser sensor, the shift value of the fanning strip that this control device calculates for the rotor deformation amount that receives described laser sensor and detect and described Displacement Feedback device, calculate the gap width of described fanning strip and described rotor angle steel plane, and export a drive control signal according to the comparative result of described gap width and a prepsetting gap value; And
Fanning strip load maintainer, is electrically connected to described control device, for promoting or described fanning strip of loweing according to received drive control signal.
An embodiment wherein, described laser sensor is made up of laser instrument, laser detector and measuring circuit, wherein said laser instrument is by red color visible laser directive body surface, described laser detector receives the laser reflected through described body surface, and described measuring circuit is for calculating the distance between described laser sensor and measured object.
An embodiment wherein, described control device is programmable logic controller (PLC) (Programmable Logic Controller, PLC).
An embodiment wherein, described laser type air preheater air leak control system also comprises device for detecting temperature, for gathering gas approach temperature.
According to another aspect of the present utility model, provide a kind of laser type air preheater air leak control system, be suitable for automatically controlling the gap between fanning strip and rotor angle steel plane, comprise:
Deformation quantity calculation element, for detecting and calculating the rotor deformation amount of described air preheater;
Displacement Feedback device, for the voltage signal fed back according to rotating potentiometer, calculates the shift value of described fanning strip;
Control device, be connected with described Displacement Feedback device with described deformation quantity calculation element, this control device is used for the shift value of the fanning strip calculated according to detected rotor deformation amount and described Displacement Feedback device, calculate the gap width of described fanning strip and described rotor angle steel plane, and export a drive control signal according to the comparative result of described gap width and a prepsetting gap value; And
Fanning strip load maintainer, is electrically connected to described control device, for promoting or described fanning strip of loweing according to received drive control signal,
Wherein, described deformation quantity calculation element is selected a laser detection pattern or a temperature detecting mode to detect and is calculated described rotor deformation amount, and the priority of described laser detection pattern is higher than described temperature detecting mode.
An embodiment wherein, when being in described laser detection pattern, laser sensor is for gathering distance value when initial value when described rotor is in zero-bit state and described rotor are heated and between described rotor angle steel plane, wherein, described rotor deformation amount equals the difference of described distance value and described initial value.
An embodiment wherein, when being in described temperature detecting mode, the gas approach temperature that described control device gathers according to device for detecting temperature and deformation quantity/temperature curve obtain the rotor deformation amount of described air preheater.
Adopt laser type air preheater air leak control system of the present utility model, its laser sensor detects the rotor deformation amount of air preheater, Displacement Feedback device calculates the shift value of fanning strip according to the voltage signal that rotating potentiometer feeds back, control device receives the shift value of the rotor deformation amount detected and the fanning strip calculated, thus calculate the gap width of fanning strip and rotor angle steel plane, by the comparative result of actual gap value and prepsetting gap value to export a drive control signal, fanning strip load maintainer promotes or fanning strip of loweing according to received drive control signal.Compared to prior art, the utility model can utilize high-precision laser ranging technique to carry out detection rotor deformation quantity, and reach contactless by means of the high directivity of laser, the feature such as high monochromaticity and high brightness, effect of telemeasurement.And the utility model also calculates the gap width of fanning strip and rotor angle steel plane by control device and compares with prepsetting gap value, fanning strip load maintainer to be promoted or lowers fanning strip, to realize good stability and high accuracy controls according to comparative result.
Accompanying drawing explanation
Reader, after having read detailed description of the invention of the present utility model with reference to accompanying drawing, will become apparent various aspects of the present utility model.Wherein,
Fig. 1 illustrates the structure composition schematic diagram of the laser type air preheater air leak control system of the embodiment according to the application;
Fig. 2 illustrates in the laser type air preheater air leak control system of Fig. 1, the gap schematic diagram of fanning strip and rotor angle steel plane;
Fig. 3 illustrates the FB(flow block) of the laser type air-heater leakage control method of another embodiment according to the application; And
Fig. 4 illustrates the operational flowchart of a specific embodiment of the laser type air-heater leakage control method adopting Fig. 3.
Detailed description of the invention
The technology contents disclosed to make the application is more detailed and complete, and can refer to accompanying drawing and following various specific embodiment of the present utility model, mark identical in accompanying drawing represents same or analogous assembly.But those of ordinary skill in the art should be appreciated that hereinafter provided embodiment is not used for limiting the scope that contains of the utility model.In addition, accompanying drawing, only for being schematically illustrated, is not drawn according to its life size.
With reference to the accompanying drawings, the detailed description of the invention of the utility model various aspects is described in further detail.
Fig. 1 illustrates the structure composition schematic diagram of the laser type air preheater air leak control system of the embodiment according to the application.Fig. 2 illustrates in the laser type air preheater air leak control system of Fig. 1, the gap schematic diagram of fanning strip and rotor angle steel plane.
Composition graphs 1 and Fig. 2, this laser type air preheater air leak control system can control the gap between fanning strip and rotor angle steel plane automatically, and it comprises laser sensor 10, Displacement Feedback device 20, control device (not shown), fanning strip load maintainer 30.In addition, this system also comprises three fanning strips, that is, fanning strip P1 ~ P3.Preferably, this control device is programmable logic controller (PLC) (Programmable Logic Controller, PLC).
Specifically, laser sensor 10 detects the rotor deformation amount of air preheater.The voltage signal that Displacement Feedback device 20 feeds back according to rotating potentiometer, calculates the shift value of fanning strip.Control device is connected with Displacement Feedback device 20 with laser sensor 10, for receiving the shift value of rotor deformation amount that laser sensor 10 detects and the fanning strip that Displacement Feedback device 20 calculates, thus calculate the gap width of fanning strip and rotor angle steel plane.
Such as, above-mentioned laser sensor 10 is made up of laser instrument, laser detector and measuring circuit, and they utilize the features such as the high directivity of laser, high monochromaticity and high brightness to realize contactless telemeasurement.Laser instrument is by camera lens by red color visible laser directive body surface, and the laser through reflections off objects passes through receiver camera lens, and received by the CCD linear camera of inside, according to different distances, CCD linear camera can identify this luminous point under a different angle.Can know the distance between laser and camera according to this angle, and then measuring circuit calculates the distance between sensor and measured object.Simultaneously, laser beam is by analogy and digital circuit process, and utilize microprocessor analysis, calculate corresponding output valve, in the analog quantity window of user's setting, outputting standard 4-20mA signal in proportion, the 4-20mA signal collected is changed into actual distance value by control device (such as PLC), and the 0-10V signal fed back by Displacement Feedback device 20 changes into the actual displacement value of fanning strip, then the shift value that the rotor deformation amount measured deducts fanning strip equals actual gap value.Actual gap value and prepsetting gap value compare by control device, and export a drive control signal according to the comparative result of gap width and prepsetting gap value.Fanning strip load maintainer 30 is electrically connected to control device, promotes or fanning strip of loweing according to received drive control signal.
In one embodiment, when gap width be greater than prepsetting gap value continue 1 minute time, fanning strip load maintainer 30 is lowerd fanning strip, to reduce actual gap gradually.When gap width be less than prepsetting gap value continue 2 second time, fanning strip load maintainer 30 promotes fanning strip, to increase actual gap gradually.In addition, laser sensor 10 detection per second rotor deformation amount, the gap width of 60 in 1 minute is carried out size sequence by control device.If minimum clearance value is greater than prepsetting gap value, then control device exports the drive control signal for fanning strip of loweing.If minimum clearance value is less than prepsetting gap value, then control device exports the drive control signal for promoting fanning strip.
In one embodiment, this air preheater air leak control system also comprises device for detecting temperature 40.Device for detecting temperature 40 gathers gas approach temperature, and wherein gas approach temperature is divided into multiple temperature range, and the feature rotor deformation amount corresponding to each temperature range simulates deformation quantity/temperature curve.Preferably, multiple rotor deformation amount is corresponded to corresponding temperature range by device for detecting temperature 40, and adopts ranking method using the feature rotor deformation amount of the minimum rotor deformation amount in same temperature interval as this temperature range.
For example, laser sensor 10 of the present utility model gathers initial value x0 when rotor is in zero-bit state in advance, when rotor be heated present mushroom sagging deflections time, measure the distance x1 between laser sensor now and rotor angle steel plane, because rotor deformation amount equals the initial value that rotor measured distance value deducts rotor, namely current rotor deformation amount s equals x1-x0.System collection per second rotor measured distance value, in 1 minute, namely will gather in the time that air preheater rotates a circle calculate 60 gap widths (s1, s2, s3 ... and adopt bubble sort method therefrom to filter out minimum clearance value s s60),
min.If s
minbe greater than prepsetting gap value s
0, then system judges that gap is large, and control device can send downlink command and drive the descending action of fanning strip, then t equals (s
min-s
0)/v, wherein t is motor descending time, and v is the movement velocity of fanning strip.Otherwise, if s
minbe less than prepsetting gap value s
0, then system judges that gap is little, and control device can send up-on command and drive the up action of fanning strip, then t equals (s
0-s
min)/v, wherein t is motor up time, and v is the movement velocity of fanning strip, to ensure that fanning strip and rotor angle steel plane are in default best clearance.
In addition, after system puts into operation, by device for detecting temperature 40 the gas approach temperature collected is divided into multiple temperature range T1, T2, T3 ..., Tn, and by calculate rotor deformation amount s1, s2, s3 ..., sn correspond to corresponding temperature range, and adopt bubble sort method using the minimum of a value that collects in the same temperature segment feature rotor deformation amount as Current Temperatures section, by the feature rotor deformation amount of different temperatures section collected, the curve between rotor deformation amount and temperature can be simulated.The process of this curve is as shown in table 1 below.
Table 1
| Rotor measured distance value | Lowest distance value | Feature rotor deformation amount | Temperature range |
| X n1 | X 1 | S 1 | T 1 |
| X n2 | X 2 | S 2 | T 2 |
| X n3 | X 3 | S 3 | T 3 |
| X n4 | X 4 | S 4 | T 4 |
| … | … | … | … |
| X nn | X n | S n | T n |
Wherein, in table 1 first is classified as measured rotor measured distance value, second is classified as the lowest distance value that these rotor measured distance values adopt bubble sort method to obtain, and the 3rd is classified as corresponding feature rotor deformation amount, and the 4th is classified as the temperature range corresponding with each feature rotor deformation amount.
In one embodiment, when laser sensor 10 breaks down, the gas approach temperature that control device gathers according to device for detecting temperature 40 and above-mentioned deformation quantity/temperature curve obtain the rotor deformation amount of air preheater.Such as, when gathered gas approach temperature is positioned at same temperature interval, because the feature rotor deformation amount of this temperature range is constant, the shift value that this fanning strip load maintainer 30 can make fanning strip remain current, thus the gap controlled between fanning strip and rotor angle steel plane remains unchanged.
Those skilled in the art is to be understood that, composition graphs 1 and Fig. 2 also can disclose another laser type air preheater air leak control system of the present utility model, utilize laser detection pattern or temperature detecting mode to calculate the rotor deformation amount of air preheater this systems allow selective, and define the necessary complement of temperature detecting mode as laser detection pattern.That is the priority of laser detection pattern is higher than temperature detecting mode.
Specifically, this laser type air preheater air leak control system comprises deformation quantity calculation element, Displacement Feedback device 20, control device and fanning strip load maintainer 30.Deformation quantity calculation element, for detecting and calculating the rotor deformation amount of air preheater, the voltage signal of Displacement Feedback device 20 for feeding back according to rotating potentiometer, calculates the shift value of fanning strip.Control device is used for the shift value of the fanning strip calculated according to detected rotor deformation amount and Displacement Feedback device, calculate the gap width of fanning strip and rotor angle steel plane, and export a drive control signal according to the comparative result of calculated gap width and a prepsetting gap value.Fanning strip load maintainer 30 is electrically connected to control device, for promoting or fanning strip of loweing according to received drive control signal.
Such as, when being in laser detection pattern, laser sensor 10 is for gathering distance value when initial value when rotor is in zero-bit state and rotor are heated and between rotor angle steel plane, and wherein rotor deformation amount equals the difference of distance value and initial value.
Such as, when being in temperature detecting mode, the gas approach temperature that control device gathers according to device for detecting temperature 40 and deformation quantity/temperature curve obtain the rotor deformation amount of air preheater.The fit procedure of deformation quantity/temperature curve is described in detail above, for simplicity, repeats no more herein.
Fig. 3 illustrates the FB(flow block) of the laser type air-heater leakage control method of another embodiment according to the application.
With reference to Fig. 3, in this control method, first perform step S101, laser sensor detects the rotor deformation amount of air preheater.Then perform step S103, according to the voltage signal that rotating potentiometer feeds back, calculate the shift value of fanning strip.Then perform step S105 and S107 successively, receive the shift value of rotor deformation amount and the fanning strip detected, calculate the gap width of fanning strip and rotor angle steel plane.Gap width and prepsetting gap value are compared, and exports a drive control signal according to comparative result.Finally perform step S109, fanning strip load maintainer promotes or fanning strip of loweing according to received drive control signal.
Fig. 4 illustrates the operational flowchart of a specific embodiment of the laser type air-heater leakage control method adopting Fig. 3.
With reference to Fig. 4, in this embodiment, laser sensor detects the rotor deformation amount of air preheater, and device for detecting temperature gathers inlet temperature, and gas approach temperature is divided into multiple temperature range, the feature rotor deformation amount corresponding to each temperature range simulates deformation quantity/temperature curve.Certainly, this deformation quantity/temperature curve also can obtain in advance in matching, and is stored in a look-up table (LUT, Look-Up Table).
Then, judge whether laser sensor breaks down.If fault-free, then enter laser detection pattern, and judge whether rotor deformation amount is in normal range (NR); If break down, then enter temperature detecting mode, calculated the feature rotor deformation amount of Current Temperatures section by matched curve.If rotor deformation amount exceeds normal range (NR), then control device can send downlink command, and fanning strip load maintainer drives the descending action of fanning strip.Such as, when gap width be greater than prepsetting gap value continue 1 minute time, fanning strip load maintainer is lowerd fanning strip; When gap width be less than prepsetting gap value continue 2 second time, fanning strip load maintainer promote fanning strip.
Then, again judge whether rotor deformation amount is in normal range (NR), if so, then motor action stops, and then continues if not motor action is exported.Finally, whether this control method also detects has fault alarm, if there is fault, then starts sound and light alarm, and notifies DCS central station of floating dock; If fault-free, then whether cycle criterion laser sensor breaks down again.
Adopt laser type air preheater air leak control system of the present utility model, its laser sensor detects the rotor deformation amount of air preheater, Displacement Feedback device calculates the shift value of fanning strip according to the voltage signal that rotating potentiometer feeds back, control device receives the shift value of the rotor deformation amount detected and the fanning strip calculated, thus calculate the gap width of fanning strip and rotor angle steel plane, the result compared by actual gap value and prepsetting gap value is to export a drive control signal, fanning strip load maintainer promotes or fanning strip of loweing according to received drive control signal.Compared to prior art, the utility model can utilize high-precision laser ranging technique to carry out detection rotor deformation quantity, and reach contactless by means of the high directivity of laser, the feature such as high monochromaticity and high brightness, effect of telemeasurement.And the utility model also calculates the gap width of fanning strip and rotor angle steel plane by control device and compares with prepsetting gap value, fanning strip load maintainer to be promoted or lowers fanning strip, to realize good stability and high accuracy controls according to comparative result.
Above, detailed description of the invention of the present utility model is described with reference to the accompanying drawings.But those skilled in the art can understand, when not departing from spirit and scope of the present utility model, various change and replacement can also be done to detailed description of the invention of the present utility model.These change and replace and all drop in the utility model claims limited range.
Claims (7)
1. a laser type air preheater air leak control system, be suitable for automatically controlling the gap between fanning strip and rotor angle steel plane, it is characterized in that, described laser type air preheater air leak control system comprises:
Laser sensor, for detecting the rotor deformation amount of described air preheater;
Displacement Feedback device, for the voltage signal fed back according to rotating potentiometer, calculates the shift value of described fanning strip;
Control device, be connected with described Displacement Feedback device with described laser sensor, for receiving the shift value of rotor deformation amount that described laser sensor detects and the fanning strip that described Displacement Feedback device calculates, calculate the gap width of described fanning strip and described rotor angle steel plane, and export a drive control signal according to the comparative result of described gap width and a prepsetting gap value; And
Fanning strip load maintainer, is electrically connected to described control device, for promoting or described fanning strip of loweing according to received drive control signal.
2. laser type air preheater air leak control system according to claim 1, it is characterized in that, described laser sensor is made up of laser instrument, laser detector and measuring circuit, wherein said laser instrument is by red color visible laser directive body surface, described laser detector receives the laser reflected through described body surface, and described measuring circuit is for calculating the distance between described laser sensor and measured object.
3. laser type air preheater air leak control system according to claim 2, is characterized in that, described control device is programmable logic controller (PLC) (Programmable Logic Controller, PLC).
4. laser type air preheater air leak control system according to claim 1, is characterized in that, described air preheater air leak control system also comprises device for detecting temperature, for gathering gas approach temperature.
5. a laser type air preheater air leak control system, be suitable for automatically controlling the gap between fanning strip and rotor angle steel plane, it is characterized in that, described laser type air preheater air leak control system comprises:
Deformation quantity calculation element, for detecting and calculating the rotor deformation amount of described air preheater;
Displacement Feedback device, for the voltage signal fed back according to rotating potentiometer, calculates the shift value of described fanning strip;
Control device, be connected with described Displacement Feedback device with described deformation quantity calculation element, for the shift value of fanning strip calculated according to detected rotor deformation amount and described Displacement Feedback device, calculate the gap width of described fanning strip and described rotor angle steel plane, and export a drive control signal according to the comparative result of described gap width and a prepsetting gap value; And
Fanning strip load maintainer, is electrically connected to described control device, for promoting or described fanning strip of loweing according to received drive control signal,
Wherein, described deformation quantity calculation element is selected a laser detection pattern or a temperature detecting mode to detect and is calculated described rotor deformation amount, and the priority of described laser detection pattern is higher than described temperature detecting mode.
6. laser type air preheater air leak control system according to claim 5, it is characterized in that, when being in described laser detection pattern, laser sensor is for gathering distance value when initial value when described rotor is in zero-bit state and described rotor are heated and between described rotor angle steel plane, wherein, described rotor deformation amount equals the difference of described distance value and described initial value.
7. laser type air preheater air leak control system according to claim 5, it is characterized in that, when being in described temperature detecting mode, the gas approach temperature that described control device gathers according to device for detecting temperature and deformation quantity/temperature curve obtain the rotor deformation amount of described air preheater.
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|---|---|---|---|
| CN201420353692.3U CN204100893U (en) | 2014-06-27 | 2014-06-27 | A kind of laser type air preheater air leak control system |
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|---|---|---|---|
| CN201420353692.3U CN204100893U (en) | 2014-06-27 | 2014-06-27 | A kind of laser type air preheater air leak control system |
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| CN204100893U true CN204100893U (en) | 2015-01-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104019695A (en) * | 2014-06-27 | 2014-09-03 | 上海市东方海事工程技术有限公司 | Laser-type air pre-heater air leakage control system and control method thereof |
| CN110530303A (en) * | 2019-08-28 | 2019-12-03 | 深圳东方锅炉控制有限公司 | The gap control system and its control method of pneumatic regenerative air heater |
-
2014
- 2014-06-27 CN CN201420353692.3U patent/CN204100893U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104019695A (en) * | 2014-06-27 | 2014-09-03 | 上海市东方海事工程技术有限公司 | Laser-type air pre-heater air leakage control system and control method thereof |
| CN104019695B (en) * | 2014-06-27 | 2016-02-24 | 上海市东方海事工程技术有限公司 | A kind of laser type air preheater air leak control system and control method thereof |
| CN110530303A (en) * | 2019-08-28 | 2019-12-03 | 深圳东方锅炉控制有限公司 | The gap control system and its control method of pneumatic regenerative air heater |
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