CN204439314U - Infrared thermal imaging low-level (stack-gas) economizer leakage detection apparatus - Google Patents
Infrared thermal imaging low-level (stack-gas) economizer leakage detection apparatus Download PDFInfo
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- CN204439314U CN204439314U CN201520089993.4U CN201520089993U CN204439314U CN 204439314 U CN204439314 U CN 204439314U CN 201520089993 U CN201520089993 U CN 201520089993U CN 204439314 U CN204439314 U CN 204439314U
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- 238000001931 thermography Methods 0.000 title claims abstract description 61
- 238000001514 detection method Methods 0.000 title claims abstract description 32
- 238000001816 cooling Methods 0.000 claims description 21
- 230000009970 fire resistant effect Effects 0.000 claims description 2
- 239000011810 insulating material Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 41
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 11
- 239000003546 flue gas Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 7
- 239000003245 coal Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 206010038743 Restlessness Diseases 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 238000001757 thermogravimetry curve Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Abstract
The utility model discloses a kind of infrared thermal imaging low-level (stack-gas) economizer leakage detection apparatus, it comprises housing and infrared thermography, housing is provided with air inlet and air outlet, the wall of housing has through hole, infrared thermography is installed in the cavity of housing, and the camera lens of infrared thermography is installed in through hole.The utility model can carry out precise positioning to the leakage position of low-level (stack-gas) economizer, and has and be quick on the draw, and cost is low, advantages of simple structure and simple, can be applied to the leak detection in boiler of power plant, Industrial Boiler.
Description
Technical field
The utility model relates to a kind of leakage detection apparatus of low-temperature coal economizer of boiler, particularly relates to a kind of device utilizing infrared thermography to carry out low-level (stack-gas) economizer leak detection.
Background technology
In fuel-burning power plant, affect in every loss of boiler efficiency, the heat loss due to exhaust gas proportion of boiler is maximum.Generally, exhaust gas temperature often increases by 10 DEG C, and heat loss due to exhaust gas increases by 0.5% ~ 0.8%, corresponding many consumption coals 1.2% ~ 2.4%.If for the subcritical boiler using coal that calorific value is 20000kJ/kg, capacity is 1000t/h, then every year consume a few kiloton steam coal more, therefore reduce exhaust gas temperature, for boiler efficiency, there is important practical significance.In order to reduce exhaust gas temperature, reduce heat loss due to exhaust gas, improve the performance driving economy of power plant, low-level (stack-gas) economizer is installed additional to reduce exhaust gas temperature on flue in present part power plant.But residing for low-level (stack-gas) economizer, the working temperature at flue position is close even lower than flue gas acid dew point temperature, therefore acid easily condenses in low-level (stack-gas) economizer pipeline outside surface, thus corrosion low-level (stack-gas) economizer, make low-level (stack-gas) economizer tube wall thinning.In addition, the fly ash granule in flue gas also can wear and tear economizer tube wall, makes low-level (stack-gas) economizer tube wall thinning.Low-level (stack-gas) economizer tube wall acid corrosion and fly ash granule wearing and tearing double action under, low-level (stack-gas) economizer can be caused to reveal.
Acoustic detection technology utilizes sonic sensor to gather the noise signal in boiler furnace, and carry out spectrum analysis to the noise signal gathered, in conjunction with pass time delay estimation method and sonic sensor array complete the leakage and orientation to generator tube mutually.The method has highly sensitive, and system equipment volume is little, can realize the advantages such as monitoring in real time, become the main detection means of present stage each high-power station boiler blasting (water-cooling wall, superheater, reheater and high-temperature economizer) leakage problem.But structural shape and the arrangement of low-level (stack-gas) economizer heat-exchanging tube bundle are different from, and " four pipes " is arranged, mostly is compact Layout, have impact on the collection of sonic sensor to leakage noise.In addition on the one hand, low-level (stack-gas) economizer internal flow be low pressure condensate water, different from the water under high pressure in " four manage " or vapour, when there is tiny leakage, because hydraulic pressure is low, the gas velocity of its leakage hole ejection is also lower, and leakage noise depends primarily on gas velocity, therefore the leakage noise intensity of low-pressure coal saver is lower than " four pipes " leakage situation, thus adds the difficulty distinguishing leakage noise and ground unrest, easily occurs the situation failed to report and report by mistake.
For above-mentioned reasons, mainly through the change detecting moisture content in flue before and after economizer, present low-level (stack-gas) economizer leak detection judges whether low-level (stack-gas) economizer leaks.The shortcoming of this method needs to carry out failture evacuation by stoppage in transit part economizer, and the leak detection cycle is long, can not accurately locate.
Infrared thermal imaging technique by the infrared radiation of detection of a target object, and by the means such as photoelectric conversion, signal transacting, obtains the temperature distribution image of target object.Therefore, can, according to leakage point temperature lower than around flue gas environment, adopt infrared thermal imaging technique to find out temperature anomaly point, thus accurate locating leaks point.Infrared thermal imaging technique has many good qualities: infrared thermography video image is clear, reaction velocity is fast, sensitivity is high and can accurately locate.Therefore utilize the feature of infrared thermal imaging technique, it be applied in economizer leak detection, a kind of efficient infrared thermal imaging low-level (stack-gas) economizer leakage detection apparatus accurately of exploitation has larger potentiality.
Utility model content
The purpose of this utility model is to provide a kind of infrared thermal imaging low-level (stack-gas) economizer leakage detection apparatus.
For achieving the above object, the technical scheme that the utility model adopts is:
The utility model infrared thermal imaging low-level (stack-gas) economizer leakage detection apparatus comprises housing and infrared thermography, described housing is provided with air inlet and air outlet, the wall of described housing has through hole, described infrared thermography is installed in the cavity of housing, and the camera lens of described infrared thermography is installed in described through hole.
Further, the utility model also comprises cooling blower, and described cooling blower is placed in outside flue, and described cooling blower is communicated with the air inlet of described housing by the air intake conduit be placed in flue.
Further, the utility model also comprises external display device, and described external display device is connected with described infrared thermography by data line.
Further, air outlet described in the utility model is sealedly connected with air-out conduit.
Further, the air intake conduit of housing described in the utility model is wrapped with fire-resistant heat insulating material.
Further, the camera lens of infrared thermography described in the utility model is seal-installed in described through hole.
Further, housing described in the utility model is placed in flue, and the tube bank of the alignment lens low-level (stack-gas) economizer of infrared thermography.
Compared with prior art, the beneficial effect that the utility model has is:
1. the utility model is by the infrared image of shooting low-level (stack-gas) economizer pipeline, intuitively can show some position, economizer leakage.Compared to existing acoustic emission detection method, apparatus structure of the present utility model is more simple, locates more accurate, does not disturb, and be quick on the draw, can make rapid reaction to leakage by ground unrest;
2. housing of the present utility model can be placed in flue, the side of housing has through hole, make the camera lens of the infrared thermography be fixed in housing can aim at the tube bank of low-level (stack-gas) economizer, thus make the tube bank of low-level (stack-gas) economizer 13 fall into the viewfinder range of the camera lens 7 of infrared thermography 2, thus the image obtaining restraining can be taken, obtain the temperature distribution image of tube bank in flue 14 of low-level (stack-gas) economizer 13, monitor leakage tube bank wherein.
3. the utility model adopts cooling air device to cool infrared thermography further, to ensure that infrared thermography can maintain normal working temperature under the washing away of high-temperature flue gas; In addition, entering housing by adopting Seal Kit to block flue gas the air outlet of housing, ensure that the utility model device can work under high-temperature flue gas environment.
Accompanying drawing explanation
Fig. 1 is the scheme of installation of the utility model leakage detection apparatus.
Fig. 2 is the A portion enlarged drawing of Fig. 1.
Fig. 3 is the vertical view of Fig. 1.
Fig. 4 is the enlarged drawing in the B portion of Fig. 3.
Fig. 5 is infrared thermal imaging design sketch.
In figure: 1. housing, 2. infrared thermography, 3. cooling blower, 4. air inlet, 41. air intake conduit, 5. air outlets, 51. air-out conduits, 6. securing member, the 7. camera lens of infrared thermography, 8. enlarging, 91. Seal Kits, 92. Seal Kits, 93. Seal Kits, 10. fire-resistant heat insulating material, 11. Aviation Connector, 12. data lines, 13. low-level (stack-gas) economizers, 14. flues, 15. external display device.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further described.
As shown in Figures 1 to 4, the utility model infrared thermal imaging low-level (stack-gas) economizer leakage detection apparatus comprises housing 1 and infrared thermography 2.Wherein, housing 1 is provided with air inlet 4 and air outlet 5; Infrared thermography 2 is fixedly installed in the cavity of housing 1 by securing member 6, and the wall of housing 1 has through hole, and the camera lens 7 of infrared thermography 2 is installed in this through hole.
Preferably, the utility model also comprises cooling blower 3, and cooling blower 3 is placed in outside flue 14.As shown in Fig. 1,2,4, cooling blower 3 is connected with one end of air intake conduit 41, and air intake conduit 41 to be connected with the air inlet 4 of housing 1 via its other end after flue 14 and to use Seal Kit 93 to seal.Thus, cooling blower 3 is communicated with the air inlet 4 of housing 1 by the air intake conduit 41 in flue 14, thus the cooling air of cooling blower 3 is cooled via air intake conduit 41 pairs of infrared thermographies 2.As preferred version of the present utility model, air inlet 4 is in enlarging shape.Lay outside air intake conduit 41 and be enclosed with high-strength fireproof heat-barrier material 10, to ensure that the cooling air in air intake conduit 41 keeps lower temperature, air intake conduit 41 can be avoided to be ruptured by high-temperature flue gas erosion corrosion simultaneously.Further, camera lens 7 is sealed by Seal Kit 91 and housing 1 and is installed together, and cooling air can be made to be full of the cavity of housing 1 better.Cooling blower 3 extracts normal temperature air as cooling air, is conveyed in the cavity of housing 1, cools infrared thermography 2, and entered in flue gas by air-out conduit 51 by air intake conduit 41 by cooling air.
During use, as shown in Figure 1,3, the housing 1 of the utility model leakage detection apparatus is placed in flue 14, and is positioned at the side of the tube bank of low-level (stack-gas) economizer 13, make the camera lens 7 of infrared thermography 2 aim at the tube bank of low-level (stack-gas) economizer 13 simultaneously, thus can photograph and all restrain image.Data line 12 passes from air intake conduit 41, and infrared thermography 2 is connected with external display device 15 by data line 12, thus infrared thermography 2 image is outputted to external display device 15, realizes the online leak detection of low-level (stack-gas) economizer.Cooling blower 3 is connected with one end of air intake conduit 41, and air intake conduit 41 to be connected with the air inlet 4 of housing 1 via its other end after flue 14 and to use Seal Kit 93 to seal; Air outlet 5 and the air-out conduit 51 of housing 1 are used Seal Kit 92 to seal and are installed.The air draft direction of air-out conduit 51 is consistent with flow of flue gas direction, can prevent flue gas from pouring in down a chimney.
The course of work of the utility model leakage detection apparatus is as follows:
As shown in Figure 1, by the distance of adjustment housing 1 with the tube bank of low-level (stack-gas) economizer 13, with the tube bank making the camera lens 7 of infrared thermography 2 aim at low-level (stack-gas) economizer 13, and make the tube bank of low-level (stack-gas) economizer 13 fall into the viewfinder range of the camera lens 7 of infrared thermography 2, thus the image obtaining restraining can be taken.Thermal infrared imager accepts the infrared radiation signal of whole flue 14, and be converted into electric signal, be transferred to external display device 15 by data line 12, thus export thermal-induced imagery in external display device 15, obtain the temperature distribution image of tube bank in flue 14 of low-level (stack-gas) economizer 13 thus.When not occurring to leak, the uniformity of temperature profile of the infrared thermal imaging figure at tube bank edge; When occurring to leak, because water leakage gasifies in hot environment, absorb heat, make leakage restrain temperature around and obviously reduce, now infrared thermal imaging figure as shown in Figure 5.In Figure 5, striped b represents the tube bank of low-level (stack-gas) economizer 13, and striped a represents flue-gas temperature and restrains shown thermograph normally.When occurring to leak, there is obvious low temperature black shade patch c in the Infrared Thermogram leaking tube bank place, thus the particular location leaking tube bank can be judged, because the image of infrared thermography outputs to external display device 15 in real time by data line 12, therefore leakage phenomenon can be found rapidly, and location tube bank, thus realize online leak detection function.
Claims (10)
1. an infrared thermal imaging low-level (stack-gas) economizer leakage detection apparatus, it is characterized in that: comprise housing (1) and infrared thermography (2), described housing (1) is provided with air inlet (4) and air outlet (5), the wall of described housing (1) has through hole, described infrared thermography (2) is installed in the cavity of housing (1), and the camera lens (7) of described infrared thermography (2) is installed in described through hole.
2. infrared thermal imaging low-level (stack-gas) economizer leakage detection apparatus according to claim 1, it is characterized in that: also comprise cooling blower (3), described cooling blower (3) is placed in flue (14) outward, and described cooling blower (3) is communicated with the air inlet (4) of described housing (1) by being placed in the air intake conduit (41) in flue (14).
3. infrared thermal imaging low-level (stack-gas) economizer leakage detection apparatus according to claim 1 and 2, it is characterized in that: also comprise external display device, described external display device is connected with described infrared thermography by data line.
4. infrared thermal imaging low-level (stack-gas) economizer leakage detection apparatus according to claim 1 and 2, is characterized in that: described air outlet (5) is sealedly connected with air-out conduit (51).
5. infrared thermal imaging low-level (stack-gas) economizer leakage detection apparatus according to claim 2, is characterized in that: the air intake conduit (41) of described housing is wrapped with fire-resistant heat insulating material.
6. infrared thermal imaging low-level (stack-gas) economizer leakage detection apparatus according to claim 1 and 2, is characterized in that: the camera lens (7) of described infrared thermography (2) is seal-installed in described through hole.
7. the infrared thermal imaging low-level (stack-gas) economizer leakage detection apparatus according to claim 1,2 or 5, is characterized in that: described housing is placed in flue, and the tube bank of low-level (stack-gas) economizer (13) aimed at by the camera lens (7) of infrared thermography (2).
8. infrared thermal imaging low-level (stack-gas) economizer leakage detection apparatus according to claim 3, is characterized in that: described housing is placed in flue, and the tube bank of low-level (stack-gas) economizer (13) aimed at by the camera lens (7) of infrared thermography (2).
9. infrared thermal imaging low-level (stack-gas) economizer leakage detection apparatus according to claim 4, is characterized in that: described housing is placed in flue, and the tube bank of low-level (stack-gas) economizer (13) aimed at by the camera lens (7) of infrared thermography (2).
10. infrared thermal imaging low-level (stack-gas) economizer leakage detection apparatus according to claim 6, is characterized in that: described housing is placed in flue, and the tube bank of low-level (stack-gas) economizer (13) aimed at by the camera lens (7) of infrared thermography (2).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520089993.4U CN204439314U (en) | 2015-02-09 | 2015-02-09 | Infrared thermal imaging low-level (stack-gas) economizer leakage detection apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520089993.4U CN204439314U (en) | 2015-02-09 | 2015-02-09 | Infrared thermal imaging low-level (stack-gas) economizer leakage detection apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104677576A (en) * | 2015-02-09 | 2015-06-03 | 中国计量学院 | Infrared thermal imaging low-temperature economizer leakage detection device |
| CN106168371A (en) * | 2016-07-22 | 2016-11-30 | 贵州电网有限责任公司电力科学研究院 | The detection device and method that the blocking of a kind of boiler water wall pipeline is the most smooth with current |
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2015
- 2015-02-09 CN CN201520089993.4U patent/CN204439314U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104677576A (en) * | 2015-02-09 | 2015-06-03 | 中国计量学院 | Infrared thermal imaging low-temperature economizer leakage detection device |
| CN106168371A (en) * | 2016-07-22 | 2016-11-30 | 贵州电网有限责任公司电力科学研究院 | The detection device and method that the blocking of a kind of boiler water wall pipeline is the most smooth with current |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150701 |
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| CF01 | Termination of patent right due to non-payment of annual fee |