CN2938185Y - Air leakage control system of air preheater - Google Patents
Air leakage control system of air preheater Download PDFInfo
- Publication number
- CN2938185Y CN2938185Y CN 200620044452 CN200620044452U CN2938185Y CN 2938185 Y CN2938185 Y CN 2938185Y CN 200620044452 CN200620044452 CN 200620044452 CN 200620044452 U CN200620044452 U CN 200620044452U CN 2938185 Y CN2938185 Y CN 2938185Y
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- lever
- sensor
- limit switch
- air
- feeler lever
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Abstract
Disclosed is an air leakage control system for air preheaters, comprising a high-temperature clearance sensor, a fan-shaped hoist mechanism and an electric control cabinet, wherein, the high-temperature clearance sensor can send the interval signals detected by the sensor to the PLC of the electric control cabinet. The clearance sensor comprises a sensor petal welded to a rotor, a probing rod with a probe, and a lever. The lever, which is connected with the probing rod through an adjustable bearing, is provided with a primary limit switch and a secondary limit switch. A fulcrum is arranged under the lever between the switches and the probing rod, closer to the probing rod. The fulcrum is used to proportionally amplify the displacement of the probing rod to limit switches. With the mechanically triggered high-temperature clearance sensor, the utility model can amplify the displacement of the probe to the limit switches through a lever, thus increasing the accuracy and ensuring the smallest gap in control limit.
Description
Technical field
The utility model relates to a kind of air preheater, particularly a kind of air preheater air leak control system.
Background technology
In recent years, the generating cause of China has welcome the high speed development stage, particularly in big or middle city, rising rapidly along with power consumption, power industry is coal-fired rich and influential family, and fired power generating unit accounts for 80% in the existing more than several hundred million kilowatts unit of China, and annual generating consumption coal accounts for 60% of national consumption of coal total amount, along with the promotion energetically of sustainable development and energy savings, very high requirement has been proposed for economy of power plant, operation efficiently.
High-temperature flue gas heating energy-accumulating element when the airflow that temperature is low passes through energy-accumulating element is taken away heat in the air preheater, reaches the purpose of preheated air.Because the rotor in the air preheater expands when being heated unevenly, the distortion of dried mushroom shape takes place, make between fanning strip and the rotor radial seal circle and exist the gap, the big more area that leaks out in gap is big more, the higher air of pressure must pass seal clearance and leak to the lower flue gas of pressure, this can make the load of pressure fan and induced draft fan and power consumption rate increase, and can limit boiler output when serious, influences the safety and economic operation of boiler.In order to reduce leaking out of air preheater hot junction, must establish a sensor therein and monitor the size variation in gap, and then according to the rreturn value of sensor, by a topworks fan-shaped seal pad that promotes or lower, neither collide the also unlikely excessive purpose in gap with the sound two parts that guarantee air preheater.
The utility model content
The purpose of this utility model is to provide a kind of air preheater air leak control system, and this air preheater air leak control system can be controlled gap between the pre-sealed circle of fanning strip automatically at minimum limit value.
For achieving the above object, the utility model is achieved in that
A kind of air preheater air leak control system, comprise high temperature clearance sensor, fanning strip hoisting gear and electrical control cabinet, described high temperature clearance sensor can feed back to detected gap signal the PLC of electric control cabinet, this PLC can be according to the motion of described feedback signal control fanning strip hoisting gear, with clearance control at minimum limit value, described high temperature clearance sensor comprises that one is welded on epitrochanterian sensing lobe, one has the feeler lever of probe, an and lever, the distance that described probe and the maintenance of sensing lobe need, described lever links together by an adjustable support and feeler lever, angle between the two can be regulated fixing by adjustable support, described lever is provided with elementary limit switch and secondary limit switch, described secondary limit switch touches the back system of setting out and can promote fanning strip automatically and transfer the temperature control model automatically to, below described lever, is provided with a fulcrum between switch and the feeler lever, more close feeler lever one side of this fulcrum, the effect of fulcrum is with the proportional limit switch that is amplified to of the displacement of feeler lever.
Further, a corrugated tube is housed on the described feeler lever, it plays connection effect and buffering effect in sensor, the regulating and controlling part that makes sensor the first half can be because of the tracking of the latter half, the probe portion deflection is excessive is damaged, and also helps the answer of deflection simultaneously.When the sensor top was subjected to large impact or extruding, corrugated tube also can play certain buffer action in addition, and probe is sustained damage, and guaranteed the safety of whole sensor.
Because the whole sensor bottom is under the high temperature, furnace interior divides air pressure greater than sensor top ambient pressure, and hot-air can leak out from the slit at sensor probe position from the bottom up by high pressure.For addressing this problem, further scheme is, a steel bushing is installed outside feeler lever, and the compression cold air is squeezed in the steel bushing, makes the pressure reduction in the whole sensor be in equilibrium state like this.Simultaneously, compressed-air actuated another part leads to sensor top, because elementary limit switch, secondary limit switch and lead thereof are equipped with in sensor top, the working environment of these electrical equipments is higher to temperature requirement.The compression cooling air just in time plays cooling effect and dedusting function, has guaranteed that electrical equipment works in normal temperature, has improved the service precision of device, has prolonged the serviceable life of device.The pressurized air that leads to the sensor bottom can be disposed the dust on probe and the sensing lobe, and the pressurized air that leads to sensor top can clean and dedusting lever, adjustable supporting, to guarantee each parts flexible motion.
The utility model air preheater air leak control system is owing to adopt the high temperature clearance sensor of mechanical trigger-type; this sensor is amplified to limit switch by leverage with the displacement of popping one's head in; be converted into electric signal; therefore improved degree of accuracy greatly; guaranteed that clearance control is at minimum limit value; thereby reduce air leak rate of air curtain; secondary limit switch touches and sets out back system meeting automatic lifting fanning strip and transfer the temperature control model automatically to simultaneously; utilize temperature to control the displacement situation of fanning strip; utilize of the back-up protection of secondary limit switch like this, improved the reliability and the security of air preheater greatly as elementary limit switch.
Description of drawings
Fig. 1 is the high temperature clearance sensor structural representation of the utility model air preheater air leak control system.
Fig. 2 is the utility model air preheater air leak control system PLC control synoptic diagram.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
The utility model air preheater air leak control system, comprise high temperature clearance sensor (as shown in Figure 1), fanning strip hoisting gear and electrical control cabinet, it is characterized in that, described high temperature clearance sensor can feed back to detected gap signal the PLC (see figure 2) of electric control cabinet, this PLC can be according to the motion of described feedback signal control fanning strip hoisting gear, with clearance control at minimum limit value, described high temperature clearance sensor comprises that one is welded on epitrochanterian sensing lobe 1, one has the feeler lever 2 of probe 21, an and lever 3, the distance that described probe 21 and 1 maintenance of sensing lobe need, described lever 3 links together by an adjustable support and feeler lever 2, angle between the two can be regulated fixing by adjustable support, described lever 3 is provided with elementary limit switch 31 and secondary limit switch 32, described secondary limit switch 32 touches the back system of setting out and can promote fanning strip automatically and transfer the temperature control model automatically to, below described lever 3, be provided with a fulcrum 33 between switch and the feeler lever 2, this fulcrum 33 more close feeler lever 2 one sides.
High temperature clearance sensor is a kind ofly to make probe 21 produce displacements by sensor probe 21 and sensing lobe 1 Mechanical Contact on the air preheater rotor circumference angle steel, and this displacement variable is delivered to elementary limit switch 31 and secondary limit switch 32 respectively through the displacement amplification device in the sensor.Thereby produce lifting or decline that electric signal is controlled the load maintainer that leaks out, reach the purpose of following the tracks of and controlling the fanning strip gap.
The gap of whole air preheater requires very accurate, and sensor is better controlled elementary limit switch 31 and secondary limit switch 32 by multiplying arrangement.Elementary limit switch 31 is selected the E2E type of Omron for use, and its adopts the milling of can spanner rotating, install, maintenance, change convenient; The device screw thread of lengthization has improved the locking intensity of switch greatly.Because sensor is directly installed on the scene; a large amount of dusts, greasy dirt and water droplet make on-the-spot condition very severe; when primary heater is worked; temperature on every side is very high again; in order to guarantee elementary limit switch 31 sensitivitys and reliability; elementary limit switch 31 has higher sensing capability and bigger distance of reaction; its serviceability temperature is in-25-+85 ℃ broad range; for preventing that distribution is by firmly back distortion; adopt the distribution safeguard measure; the display of tail end high brightness has improved the visuality of pilot lamp greatly, and demonstration is come into plain view.
When the elementary limit switch 31 of sensor lost efficacy and can't move the time; fanning strip can continue to follow the tracks of the rotor of thermal deformation downwards; the gap of causing fanning strip and rotor radial seal face reduces and gradually less than the gap of setting; have the danger of stuck rotor this moment; utilize of the back-up protection of secondary limit switch 32 as elementary limit switch 31; the reliability and the security of primary heater have been improved greatly; secondary limit switch 32 touches the back system of setting out and can promote fanning strip automatically and transfer the temperature control model automatically to, utilizes temperature to control the displacement situation of fanning strip.For the sensitivity of raising system control, secondary limit switch 32 is selected the elementary limit switch 31 of the D4MC type of Omron for use, and it has high mechanical life more than 1,000 ten thousand times and the high electrical endurance more than 500,000 times, allows operating speed 0.05-0.5mm/s.Do not use any sticker and bolt-lock, use the sealed bolster plate diaphragm seal, can keep the sealing of height, use the mold pressing terminal type in the place that dust, oil droplet and moisture are too much, have that draw in the left side, draw on the right side, draw the lower end etc. three types available, environment for use temperature :-10-+80 ℃.
The mechanical material of vitals has used stainless steel and alloy material, has done a series of antirust and anti-corrosion treatment for other material, has done when sensor installation and has improved and reliably anti-pyroprocessing.
High temperature clearance sensor probe 21 is welded on the fanning strip side of air preheater by support, and can adjust the distance between probe 21 and the sensing lobe 1.In order to make lever 3 maintenance levels, in sensor, designed adjustable supporting 23, adjustable supporting 23 is to comprise a back nut, back nut is fixed on the feeler lever 2, thereby makes angle between lever 3 and the feeler lever 2 be decided by the adjustment of back nut.When the swivel bearing nut, just can adjustment (adjusting) lever 3 with the angle of feeler lever 2, guarantee the operate as normal of sensor lever 3 and the triggering of electrical equipment with this.Just can fix with round nut in case adjust angle, like this, no matter what kind of regulates feeler lever 2 in debugging, and the angle of lever 3 and feeler lever 2 can keep a fixing angle.Can adjust back nut according to different situations in the debugging at the scene, make whole sensor directly perceived more and flexible in the tracking fanning strip gap and the charger operation of leaking out, what also be more prone to debugging and working.
The gap of whole air preheater requires very accurate, high temperature clearance sensor has a displacement to amplify setting, it is at fixing elementary limit switch 31 of the diverse location of lever 3 and secondary limit switch 32, in the middle of lever 3, a fulcrum 33 is arranged, can allow original small fanning strip gap be delivered on elementary limit switch 31 and the secondary limit switch 32 like this by feeler lever 2 and displacement amplification device.Difference by the displacement enlargement factor can better be controlled elementary limit switch 31 and secondary limit switch 32.Enlargement factor is the fixing elementary limit switch 31 in 1: 3 place, can allow bigger that the gap fluctuation range at probe 21 places embodies on lever 3, is easy to control; Enlargement factor is 1: 1.5 fixing elementary limit switch 31 in place; if elementary limit switch 31 is malfunctioning; along with the sensor tracking range is increasing; in case trigger probe 21; this moment, sensor lever 3 work ranges substantially exceeded the decrement of elementary limit switch; thereby trigger secondary limit switch 32, make whole leak control system change the temperature control state over to, protection sensor and whole charger.So elementary limit switch 31 and secondary limit switch 32 play the effect of control and protection respectively, make the reliability of sensor aspect control obtain bigger guarantee.Simultaneously also being beneficial to the field adjustable personnel debugs sensor easily.
Whole sensor is when following the tracks of fanning strip, can make sensor to lower compression, in order to offset this part deflection, a corrugated tube 6 is housed in sensor, it plays connection effect and buffering effect in sensor, the regulating and controlling part that makes sensor the first half can be because of the tracking of the latter half, the probe portion deflection is excessive is damaged, and also helps the answer of deflection simultaneously.When the sensor top was subjected to large impact or extruding, corrugated tube 6 also can play certain buffer action in addition, and probe 21 is sustained damage, and guaranteed the safety of whole sensor.
Because the working environment of high temperature clearance sensor is subjected to temperature and on-the-spot influence, face the working environment of high temperature, high pressure and many dusts of air preheater, pressurized air with cleaning cools off and cleans sensor probe 21, and plays the effect of positive seal.
The whole sensor bottom is under the high temperature, and furnace interior divides air pressure greater than sensor top ambient pressure, and hot-air can leak out from the slit at sensor probe 21 positions from the bottom up by high pressure.For addressing this problem, we have installed a steel bushing specially outside feeler lever 2, and the compression cold air is squeezed in the steel bushing, make the pressure reduction in the whole sensor be in equilibrium state like this.
Compressed-air actuated another part leads to sensor top, because elementary limit switch 31, secondary limit switch 32 and lead thereof are equipped with in sensor top, the working environment of these electrical equipments is higher to temperature requirement.The compression cooling air just in time plays cooling effect and dedusting function, has guaranteed that electrical equipment works in normal temperature, has improved the service precision of device, has prolonged the serviceable life of device.
The pressurized air that leads to the sensor bottom can be disposed the dust on probe 21 and the sensing lobe 1, and the pressurized air that leads to sensor top can clean and dedusting lever 3, adjustable supporting 23, to guarantee each parts flexible motion.
According to the operating mode situation of air preheater, in conjunction with characteristics and the technical requirement and the operating position of the control of leaking out, high temperature clearance sensor is safe and reliable with it, and is economical and practical, and convenience operation obtains certainly.
When the elementary limit switch 31 of sensor lost efficacy and when triggering secondary limit switch 32 actions, system will change the temperature control model automatically over to.This device is responsible for the collecting temperature signal by the thermopair that is installed in the gas approach place, delivers to PLC again and carries out data processing.Control the position of fanning strip according to current gas approach place temperature.(respective value of temperature and position can preestablish)
The electric thermo-couple temperature sub controlling unit makes system still keep certain control ability of leaking out after can breaking down at the elementary limit switch 31 of sensor, is effective sub controlling unit.
Claims (3)
1. air preheater air leak control system, comprise high temperature clearance sensor, fanning strip hoisting gear and electrical control cabinet, it is characterized in that, described high temperature clearance sensor can feed back to detected gap signal the PLC of electric control cabinet, this PLC can be according to the motion of described feedback signal control fanning strip hoisting gear, with clearance control at minimum limit value, described high temperature clearance sensor comprises that one is welded on epitrochanterian sensing lobe, one has the feeler lever of probe, an and lever, the distance that described probe and the maintenance of sensing lobe need, described lever links together by an adjustable support and feeler lever, angle between the two can be regulated fixing by adjustable support, described lever is provided with elementary limit switch and secondary limit switch, and described secondary limit switch touches the back system of setting out and can promote fanning strip automatically and transfer the temperature control model automatically to, below described lever, be provided with a fulcrum between switch and the feeler lever, more close feeler lever one side of this fulcrum.
2. air preheater air leak control system according to claim 1 is characterized in that: a corrugated tube is housed on the described feeler lever.
3. air preheater air leak control system according to claim 1 and 2 is characterized in that: steel bushing of the outer installation of described feeler lever is pressed into pressurized air in the described steel bushing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620044452 CN2938185Y (en) | 2006-08-01 | 2006-08-01 | Air leakage control system of air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620044452 CN2938185Y (en) | 2006-08-01 | 2006-08-01 | Air leakage control system of air preheater |
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| Publication Number | Publication Date |
|---|---|
| CN2938185Y true CN2938185Y (en) | 2007-08-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620044452 Expired - Lifetime CN2938185Y (en) | 2006-08-01 | 2006-08-01 | Air leakage control system of air preheater |
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| CN (1) | CN2938185Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278767A (en) * | 2010-06-12 | 2011-12-14 | 上海市东方海事工程技术有限公司 | Air leakage control system and control method for air pre-heater |
| CN102679933A (en) * | 2012-05-29 | 2012-09-19 | 上海市东方海事工程技术有限公司 | Absolute displacement monitoring device used for lifting mechanism |
| CN105841186A (en) * | 2016-06-03 | 2016-08-10 | 上海市东方海事工程技术有限公司 | Linear differential expansion type driving device |
| CN106016339A (en) * | 2015-08-29 | 2016-10-12 | 大唐韩城第二发电有限责任公司 | Gap control visual device of air preheater |
| CN113587132A (en) * | 2021-07-01 | 2021-11-02 | 华能巢湖发电有限责任公司 | Automatic adjusting method for air preheater gap adjusting device based on FOXBORD IA Series system |
-
2006
- 2006-08-01 CN CN 200620044452 patent/CN2938185Y/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278767A (en) * | 2010-06-12 | 2011-12-14 | 上海市东方海事工程技术有限公司 | Air leakage control system and control method for air pre-heater |
| CN102278767B (en) * | 2010-06-12 | 2013-09-11 | 上海市东方海事工程技术有限公司 | Air leakage control system and control method for air pre-heater |
| CN102679933A (en) * | 2012-05-29 | 2012-09-19 | 上海市东方海事工程技术有限公司 | Absolute displacement monitoring device used for lifting mechanism |
| CN102679933B (en) * | 2012-05-29 | 2015-04-15 | 上海市东方海事工程技术有限公司 | Absolute displacement monitoring device used for lifting mechanism |
| CN106016339A (en) * | 2015-08-29 | 2016-10-12 | 大唐韩城第二发电有限责任公司 | Gap control visual device of air preheater |
| CN106016339B (en) * | 2015-08-29 | 2018-02-06 | 大唐韩城第二发电有限责任公司 | The clearance control visual device of air preheater |
| CN105841186A (en) * | 2016-06-03 | 2016-08-10 | 上海市东方海事工程技术有限公司 | Linear differential expansion type driving device |
| CN113587132A (en) * | 2021-07-01 | 2021-11-02 | 华能巢湖发电有限责任公司 | Automatic adjusting method for air preheater gap adjusting device based on FOXBORD IA Series system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20070822 |
|
| EXPY | Termination of patent right or utility model |