CN1224494A - Linear scan hot spot detection system - Google Patents
Linear scan hot spot detection system Download PDFInfo
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- CN1224494A CN1224494A CN 97196116 CN97196116A CN1224494A CN 1224494 A CN1224494 A CN 1224494A CN 97196116 CN97196116 CN 97196116 CN 97196116 A CN97196116 A CN 97196116A CN 1224494 A CN1224494 A CN 1224494A
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Abstract
A rotary regenerative air preheater (10) having a linear scan hot spot detection system (38). This linear scan hot spot detection system (38) has a linear rail assembly (44) generally extending from the center to the periphery of the rotor (14) cavity. The rail assembly (44) preferably supports two carriage assemblies (54) for linear motion thereon. A drive mechanism (58) located on the exterior wall of the air preheater (10) shuttles the carriages (54) between the central portion and the peripheral portion of the rotor (14) cavity. Each carriage assembly (54) supports a single infrared sensor assembly head (66) for detecting hot spots on the air preheater rotor (14). The linear reciprocating motion of the two carriages (54) results in complete detection coverage for the rotating air preheater rotor (14).
Description
Background of the present invention
The present invention relates to rotate the detection of focus in the heat exchange type air preheater.Say more more specifically, the present invention relates to a kind of sweep mechanism that is applicable to that improved focus is surveyed.
The contained transfer of heat of waste gas that the heat exchange type air preheater of rotation is commonly used to smelting furnace is discharged is in the combustion air that enters.The phenomenon of may catching fire in this air preheater when starting when cold start-up or after hot standby, is the most normal generation.Why this phenomenon of catching fire takes place, and is to contain unburned or only partially combusted fuel in the waste gas because the inefficient combustion of fuel causes, and agglutinates on the air preheater heat exchange elements.Along with the temperature that enters air preheater constantly increases, the thing that agglutinates is toasted and is formed the material of the varnish of a kind of picture sclerosis.This baking occurs in 205-260 ℃ of (400-500) temperature range, and the above-mentioned thing that agglutinates just can blaze up when temperature is elevated to 315-370 ℃ (600-700 °F).
The beginning in the little zone of of the thing that agglutinates often of above-mentioned combustion phenomena, the equipment operator often may not recognize, and the phenomenon of catching fire has taken place.In the starting stage of burning, may be also not obvious to externalities.The thing that agglutinates is limiting flowing of combustion gas or air uniquely, so that few of excess heat that produces because of burning is pulled away.What is more, and the fluid downstream mixing farthest reduces externalities, thereby covered the existence of burning.In addition, the metal fever transfer element in the burned zone of heat that produced of burning absorbs.Actual increase in temperature process may be quite slow.If can detect focus as soon as possible, then be used for chilling be lower than the required water yield of air heater element of ignition temperature just can not be excessive.Yet if there is not early stage detection, elevated temperature will be continued in the surface of air heater element, up to the also ignitable degree of hardware itself.About 705 ℃ (1300 °F) may take place in this situation, and temperature may be increased to more than 1650 ℃ (3000 °F) rapidly then, and this only is the thing within a few minutes.Above-mentioned this metal burning is that self continues, and therefore needs a large amount of water that temperature is reduced to reasonable levels.In these cases, the fire distinguisher beyond dewatering as carbon dioxide and so on, does not all have effect, because they lack enough cooling effects.
In order to prevent the generation of catching fire, some systems that are used to survey overheated condition (focus) and warning have now been developed.These detection systems preferably adopt a kind of pyroscan or sensor, and are because its reaction time is fast, all very sensitive to the minor variations of ambient temperature.The susceptibility of infrared system is adjustable, but also can set, and reports to the police so that trigger when detecting focus and be higher than 95-150 ℃ of exhaust gas entrance temperature (200-300).
Current hot spot detection system generally all has a plurality of infrared ray sensors, is used to supervise focus on the air preheater rotor with it.Sensor is installed in a sensor drive device that is used for driving sensor, to measure the temperature on the whole preheater rotor.Sensor drive device generally reaches its outer rim from the centre of air preheater.Common two to four even spiral arms arranged apart are stretched from drive unit.An infrared ray sensor all is housed on each spiral arm, is used for experiencing focus.The number of required spiral arm and sensor is normally directly adjusted according to the size specification of preheater.Each spiral arm drives corresponding sensor by about 180 ° curved path, to reach the whole coverage rate of rotor radius.Sensor and sensor drive device assembly comprise the drive motors and the tape channel of sensor drive device, all be by air preheater cold junction centre the limit in addition standard install.
Driving mechanism, control stick, link rod and spiral arm that sensor drive device is required may occupy sizable space in air preheater inside.The required space of conventional sensors drive unit counteracts each structure member usually, for example the pipe bracket that air conduit is used.The consequence that this obstruction brings is, with respect to air heater element, sensor take headroom less than best requirement.Sensor is approximately the 30-40 inch apart from the minimum distance of heating element heater, and this depends on the height in the centre that driving mechanism is installed thereon.
In addition, support and drive motors, flexible conduit and the passage of driving sensor, all be placed in the centre of preheater.The position of above-mentioned position in the preheater centre makes condition of work restricted, sensor drive device and sensor head being keeped in repair when servo, can bring difficulty.
Present hot spot detection system may demonstrate several operational weak points.The sweeping arc stroke of sensor causes the useless motion of crossing the rotor surface.In addition, for driving the number of sensor through required drive unit, link rod and spiral arm of whole rotor coverage rate, may causing now, the reliability of hot spot detection system reduces.
Main points of the present invention
In brief, the linear scan hot spot detection system that the present invention proposes has a linear track duct device, and it stretches to its outer rim from the center of rotating body cavity usually.Rail set preferably supports two carriage devices to be applicable to linear motion thereon.At the driving mechanism of settling on the outer wall of air preheater above-mentioned carriage device can be moved back and forth between centre of rotating body cavity and peripheral part.Each carriage device is supporting the infrared sensor device head of a list, is used for each focus on the detecting air preheater rotor with it.The linear reciprocal movement of two carriage devices can cause the complete scope that spreads all over of detection to the coverage rate of the air preheater rotor of rotation.
Linear scan hot spot detection system of the present invention only need be with two sensor devices, to realize the comprehensive scanning probe to full-scale preheater.Adjust the length of rail set, just hot spot detection system of the present invention can be used on the preheater of different sizes, and not need that add or different sensor devices or driving mechanism assembly.This hot spot detection system has been simplified required mechanical part, thereby has reduced manufacturing cost, and has improved the reliability of detection system.
Drive motors, decelerator, the passage used with electric cable water, air, and miscellaneous part all are placed in the outside of air preheating housing.Above-mentioned parts are in outside position and allow to carry out various maintenance works in the outside of air preheater, working environment are improved and safer.Therefore, the maintenance work of linear hot spot detection system is simplified.
Another improvements are, the more close air heater element in the installation site of probe is surveyed to adapt to the focus that has improved owing to the low profile of drive unit.Rail set and driving mechanism generally have horizontal alignment in housing, thereby have reduced the used height of hot spot detection system.Vertical orientated parts for example transmission device all are placed in outside the housing.
From operating aspect, come compared with common hot spot detection system, the reciprocating linear motion of this hot spot detection system has reduced the useless motion that probe crosses the rotor surface.
An object of the present invention is to provide a kind of hot spot detection system with improved focus detection performance.
Another object of the present invention provides a kind of better simply but more reliable hot spot detection system.
A further object of the present invention provides a kind of hot spot detection system that can safeguard from the air preheater outside.
A further object of the present invention provides a kind of like this hot spot detection system, surveys in order to improve focus, and this system can settle near the air preheater heat exchange elements.
A further object of the present invention provides a kind of like this hot spot detection system, and it has reduced carries out the number that focus is surveyed required probe.
A further object of the present invention provides a kind of hot spot detection system that is common to the air preheater of different-diameter.
Above-mentioned purpose of the present invention can be found out from relevant specification and accompanying drawing with other purposes.
Brief note to accompanying drawing is described
Fig. 1 is the cross section diagrammatic side view that adopts the air preheater of linear scan hot spot detection system of the present invention;
Fig. 2 is the partial cross-section top view of linear hot spot detection system shown in Figure 1, partial sectional view;
Fig. 3 is the partial cross-section end-view along the 3-3 line of linear hot spot detection system shown in Figure 2;
Fig. 4 is the side view of linear hot spot detection system shown in Figure 2 along the 4-4 line, partial sectional view;
Fig. 5 is the end-view along the 5-5 line of linear hot spot detection system shown in Figure 2, partial sectional view;
Fig. 6 is an amplification partial side view along the 6-6 line of dolly shown in Figure 2, detector head and track, partial sectional view;
Fig. 7 is an amplification partial section along the 7-7 line of drive sprocket device shown in Figure 5, partly disassembles;
Fig. 8 is the fragmentary top plan view of an amplification of the inward end of rail system shown in Figure 2, partly disassembles.
Description of preferred embodiments
Represent a rotation heat exchange type air preheater with numeral 10.Preheater 10 has the barrel mast shape shell or a housing 12 and the outer surface 21 that define housing inner chamber 13.A rotor 14 can be installed in the housing 12 rotatably, and it has heat exchange elements commonly used, is used for shifting the heat (see figure 1).Rotor 14 also has an axle 18, is used for supporting rotor 14 to realize rotation.Axle 18 extends through center, a hot junction 31 and a cold junction center 33.
Housing 12 also is furnished with an exhaust gas entrance passage 20, waste gas outlet passage 22, an air inlet passage 24 and an air outlet passage 26.Cross access road and exit passageway 20,22,24,26 has been installed some support bars 50, be used for strengthening the support structure (see figure 2) of housing 12.Demarcation strip 28 and 30 extends through housing 12, and near the upper and lower surface of rotor 14, they are separated into air one side 11 and waste gas one side 15 with preheater 10.Arrow among Fig. 1 points out that respectively air stream and waste gas stream pass through the direction of preheater 10.The waste gas of heat is entered by exhaust gas entrance passage 20, and heat is transferred to the heat exchange elements of air preheater, and at this moment moving body 14 is to rotate continuously.The heat exchange elements of the air preheater that has been heated is rotated and air one side 11 that enters air preheater 10, and here, heat is transferred to the combustion-supporting air flow that enters air inlet passage 24.
Linear scan hot spot detection system 38 is positioned in the air inlet passage 24 place's (see figure 1)s in the housing 12.Linear scan hot spot detection system 38 preferably is placed in the below of rotor 14, and the place near air inlet passage 24 is beneficial to the focus on the detecting air preheater rotor 14.Detection system 38 generally extends between the center and periphery of housing 12.Linear scan hot spot detection system 38 has a linear track duct device 44, and this rail set crosses housing 12 according to radial level ground substantially and extends at air inlet passage 24 places.The inward end 46 of rail set 44 is installed in housing 12, substantially near housing center (see figure 2).48 at the extroversion end of rail set 44 is fixed on the periphery of housing 12.Will be appreciated that detection system 38 can be placed in any access road or exit passageway 20,22,24,26 places, survey to realize focus.
Rail set 44 has the linear track 52 separated from one another that pair of parallel ground is arranged, is used to support a pair of dolly 54.(seeing Fig. 3 and 6).Track 52 is installed on the housing 12, and the installation site is near the center of preheater.Track 52 can be supported by the carriage 49 and the stay 50 that are fixed on the track 52 again.Each track 52 generally all has " I " shape cross section.Upper flange 39 on each track 52 and lower flange 40 define a track recess 53 and a track recess 55 inwardly outwardly.Settle a movable trolleys 54 on each track 52.Dolly 54 has U-shape framework 36, extends across upper flange 39, is in the front of track recess 53,55.Severally can be installed in rotatably on the dolly framework 36, rollably mesh the lower flange 40 of track recess 53,55 inboards of track 52 the dolly pulley 41 that flange is housed.A pair of roller 45 also is can be installed in rotatably on each dolly framework 36, rollably meshes the lower surface of each lower flange 40, to keep the steadily linear movement on track 52 of dolly framework 36.Track 52 is determined a longitudinal axis A and a transversal line B, and transversal line B is vertical mutually with longitudinal axis.Hot spot detection system 38 normally crosses longitudinal axis A symmetrically.
A transmission device 58 drives dolly 54 and does reverse linear reciprocal movement along track.Transmission device 58 has a strand bar 57, and this chain extends along the track recess 55 of the inboard of each track, and is fixed on (see figure 6) on each dolly framework 36 by a threaded adjustable chain chuck 42.A hawser or the 56 inside track recesses 55 along each track of restricting stretch, and are fixed on each dolly by a threaded adjustable retainer clip 37.(see figure 6) therefore, chain 57, steel wire rope 56 and dolly 54 constitute a continuous loop.Strand bar 57 moved on rail set 44 along driving two dollies 54 in the rightabout of longitudinal axis A in driven while.A pair of pulley 59 can be placed on the pulley chuck 51 on the inward end 46 of rail set 44 rotationally, in order to inner track recess 53 (see figure 8)s of guiding steel wire rope 56 from the inner track recess 53 of a track 52 to another track 52.
On the extroversion end 48 of rail set 44, chain 57 passes housing 12, before reentering housing 12, passes the transmission device 58 on the outer wall 21 that is installed in housing 12 usually.Transmission device 58 has a pair of idler sprocket 61, is used for guiding chain 57 to enter the inner track recess 53 of two tracks 52.Idler sprocket all is can be installed in rotationally on the sprocket wheel chuck 47 of the extroversion end 48 that is fixed in rail set 44 and housing 12.A turnbuckle 37 on the (see figure 7) steel wire rope 56 can rotate to be regulated, and so as to enough rates of tension of maintenance steel wire rope 56 and chain 57, thereby prevents chain 57 and steel wire rope 56 sagging and frictions on the flange 39,40 of track 52.(see figure 6)
Rotating drive sprocket 63 is meshed with chain 57, to drive chain 57, slides on rail set 44 thereby drive dolly 54.The reversible electric machine of being handled by the decelerator 62 of a double-reduction 60 drives drive sprockets 63 by a driving shaft 65 and does alternately and rotatablely move.So dolly 54 is according to opposite linear direction operation, wherein, when a dolly 54 was in the inward end 46 of rail set 44,54 in another dolly was in the extroversion end 48 of rail set 44.Drive sprocket 63 is placed in the transmission mechanism shell 69 that is assemblied on housing 12 outsides.Driving shaft 65 passes the transmission mechanism shell, with rotating drive sprocket wheel 63.A four-cam formula limit switch 64 is set up by hand according to the position of dolly, so as to the reverse of control motor 60, moves back and forth with the continuous reverse linear of realizing dolly 54.(see figure 5)
In operating process, drive drive sprockets 63 rotations by motor 60, with an end of tension chain 57, thereby one of two dollies 54 are pulled to the extroversion end 48 of rail set 44.The tensile force of chain 57 is passed to steel wire rope 56 by above-mentioned dolly 54, rotary pulley 59, and another dolly 54 is pulled to the inward end 46 of rail set 44.The counter-rotating of drive sprocket 63 is another end of tension chain then, thereby another dolly 54 is pulled to the extroversion end 48 of rail set 44, first dolly 54 is pulled to the inward end 46 of rail set 44.
One cover water, air and electric cable 67 are supplied with water, gas and electricity to each sensor device 66, and allow signal is transferred to sensor display unit (not shown in the figures bright) from sensor device 66.Each group cable 67 all enters air preheater 10 by a cable passage 68 on the housing 12.The device of air, water and cable 67 extends through the rigidity cable shell 70 that certain angle is arranged that is positioned at rail set 44 belows.Rigidity cable shell 70 approximately is half length of the length of rail set 44, and terminates in cable chuck 75 places of an almost fixed at the middle part of rail set 44.Each group cable 67 continues then to extend and passes through the cable shell 72 of the flexible segment type of a separation, and this cable shell one end is installed on the cable chuck 75, and the other end is placed on one of two dollies 54.When dolly 54 when rail set 44 moves, flexible cable shell 72 limits dynamic U-shape path between two tracks 52.Usually a cable carriage 73 that is U-shape is placed between two tracks 52, is vertically supporting flexible cable shell 72 from the lower flange 40 of each track 52.Cable carriage 73 has vertical cable guidance part 73, when track 52 moves, flexible cable shell 72 is maintained in the (see figure 3) that concerns that parallels with track 52 with convenient dolly 54.
Enter hole 74 and be arranged on the housing 12, so that keep in repair near each dolly 54 and sensor device 66.Each feeds the position in hole 74 and roughly makes a straight line with the mobile route of one of two dollies 54.Feed port lid 80 and be meshed with each feeding hole 74 hermetically, so that when preheater 10 operations, housing 12 is sealed.When corresponding dolly 54 was in motion boundary on the extroversion end 48 of rail set 44, a flange 76 extended from each dolly 54, was meshed with each seal washer 78 that feeds on the inboard in hole 74 hermetically.When this dolly 54 was in the motion restriction point, the sensor 66 on the dolly 54 stretched into and feeds in the hole 74.Can remove so feed port lid 80, so that sensor is keeped in repair.
In operation process, the reverse linear of linear scan hot spot detection system 38 moves back and forth and combines with rotatablely moving of rotor 14, thereby causes the complete scope that spreads all over of the scan hot spot detection of air preheater rotor 14.The low profile of detection system 38 makes detection system 38 can obtain the optimum position, promptly from rotor 14 about 21 inches, and is in brace 50 tops of supporting air inlet passage 24, is beneficial to improve focus and surveys.
Though a preferred embodiment of the present invention is illustrated and describes in detail, should be readily appreciated that, for this makes many improvement and change is within the limit of power of persons skilled in the art.Therefore, appending claims is intended to being in any and all those improvement are included in true spirit of the present invention and the scope.
Claims (17)
1. the heat exchange type air preheater of a rotation, it comprises:
A housing, its gauge goes out housing inner chamber and outer surface, and described housing inner chamber has a center and a periphery district;
Rotator device, it can be placed in the described housing rotatably, is used for the transfer of heat in the waste gas stream in air stream;
Rail set, it comprises a linear track that extends between described periphery district and center;
Carriage device, it can be placed on the described rail set movably;
Sensor device is used to survey the focus on the described rotator device, and this sensor device is positioned on the described carriage device; And
Transmission device is connected on the described carriage device, moves on the rail set between center and the periphery district to drive this carriage device.
2. the rotation heat exchange type preheater described in claim 1 is characterized in that: transmission device comprises a sprocket transmission device and one and is fixed on the carriage device and the chain that is meshed with this sprocket transmission device.
3. the rotation heat exchange type preheater described in claim 1, it also comprises:
Second carriage device, it is placed on the described rail set movably, and is connected with described transmission device, moves on the rail set between center and the periphery district so as to driving second carriage device.
4. described in claim 3, rotate the heat exchange type preheater, it is characterized in that: described chain and carriage device constitute a continuous loop, described transmission device also comprises a sprocket transmission device, and the latter is placed in the outer surface of housing, so as to the described chain of transmission.
5. rotate the heat exchange type preheater described in claim 1, it is characterized in that: described sensor device comprises a kind of infrared ray sensor.
6. rotate the heat exchange type preheater described in claim 1, it is characterized in that: linear track has " I " shape cross section, forms two track recesses; Carriage device comprises pulley, and pulley is positioned in the described track recess, and rollably is meshed with described track.
7. described in claim 1, rotate the heat exchange type preheater, it is characterized in that: it also comprises and being used for to the cable installation of sensor device power supply and the cable canning with a soft shell part, described cable installation in described soft shell device and also described soft shell device constitute a variable U-shape path.
Described in claim 7 rotation the heat exchange type preheater, it is characterized in that: described cable canning also comprises an outer rigid housing part.
9. the heat exchange type preheater of a rotation, it comprises:
A housing has an inner chamber and an outer surface, and inner chamber is divided into core and peripheral part;
Rotator device rotatably is placed in the described inner chamber, is used for the heat of waste gas stream changed to air flowing;
Rail set comprises a plurality of linear tracks that extend between described peripheral part and the core;
A plurality of carriage devices, each carriage all are to be placed in movably on one of them described track;
Sensor device is placed on each described dolly, and sensing device is used to survey the focus on the described rotator device; And
Transmission device is used to drive carriage and moves on the described rail set that is between core and the peripheral part, and described transmission device comprises a transmission device that is installed on the described housing outer surface.
10. the rotation heat exchange type preheater described in claim 9 also comprises:
The cable canning, be placed in the described inner chamber, this cable canning has a rigidity cable housing parts and a flexible cable housing parts, and described rigidity cable housing parts is placed on the described housing, and described flexible cable housing parts is placed on the described dolly; And
Cable installation, it extends to carriage device from described housing outer surface by the cable canning.
11. the rotation heat exchange type preheater described in claim 9 is characterized in that: described linear track has general " I "-shape cross section, constitutes recess.
12. the rotation heat exchanger preheater described in claim 11, it is characterized in that: described carriage device comprises pulley, and pulley is placed in the described track recess, and rollably is meshed with described linear track.
13. the rotation heat exchange type preheater described in claim 9 is characterized in that: sensor device comprises an infrared sensor.
14. a hot spot detection system is used for surveying a focus that rotates the heat exchange type preheater, described detection system comprises:
Rail set comprises a pair of parallel orbit of closely arranging;
First carriage device is placed on one of described pair of tracks movably;
Second carriage device is placed on another track of described pair of tracks movably;
Detector assembly on each described carriage device is used to survey focus;
Transmission device is used to drive described first and second carriage devices and carries out reverse reciprocating linear motion on described related track.
15. the hot spot detection system described in claim 7 is characterized in that: transmission device comprises a chain, is used for described each carriage device is fixed on chuck on this chain and the sprocket transmission device that is used for this chain of transmission.
16. the hot spot detection system described in claim 8, it is characterized in that: described transmission device also comprises a flexible wire ropes that is fixed on first and second carriage devices, and described chain, first and second dollies and steel wire rope constitute a continuous loop.
17. the hot spot detection system described in claim 7 also comprises:
The cable canning is used for to described sensor device feed; Described cable canning comprises a rigidity cable housing parts and a flexible cable housing parts, and described flexible cable housing parts is placed on the described carriage device; And
By outer rigid housing part and the cable installation that partly extends by soft shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97196116 CN1224494A (en) | 1996-07-01 | 1997-06-23 | Linear scan hot spot detection system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/674,361 | 1996-07-01 | ||
| CN 97196116 CN1224494A (en) | 1996-07-01 | 1997-06-23 | Linear scan hot spot detection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1224494A true CN1224494A (en) | 1999-07-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97196116 Pending CN1224494A (en) | 1996-07-01 | 1997-06-23 | Linear scan hot spot detection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1224494A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107817785A (en) * | 2017-11-06 | 2018-03-20 | 乌鲁木齐市隆盛达环保科技有限公司 | A kind of engine monitor system and monitoring method based on virtual image |
-
1997
- 1997-06-23 CN CN 97196116 patent/CN1224494A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107817785A (en) * | 2017-11-06 | 2018-03-20 | 乌鲁木齐市隆盛达环保科技有限公司 | A kind of engine monitor system and monitoring method based on virtual image |
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