CN201867255U - Single-tube air-extracting thermocouple - Google Patents
Single-tube air-extracting thermocouple Download PDFInfo
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- CN201867255U CN201867255U CN2010206244717U CN201020624471U CN201867255U CN 201867255 U CN201867255 U CN 201867255U CN 2010206244717 U CN2010206244717 U CN 2010206244717U CN 201020624471 U CN201020624471 U CN 201020624471U CN 201867255 U CN201867255 U CN 201867255U
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- thermocouple
- air
- extracting
- tube
- working media
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Abstract
The utility model relates to a single-tube air-extracting thermocouple comprising a thermocouple, wherein an air ejecting and extracting device is installed outside the measuring terminal of the thermocouple, and a supporting tube for the thermocouple is a single tube. The thermocouple is an air-extracting thermocouple with a thermal shielding cover. In the utility model, the air ejecting and extracting device is installed at the head (the measuring terminal) of the air-extracting thermocouple, a gust of compressed air is used as air-extracting working media and cooling working media, the supporting tube for the thermocouple is the single tube, and the working media in the tube flows unidirectionally. Compared with the conventional multi-tube water-cooling air-extracting thermocouple, the single-tube air-extracting thermocouple has the following advantages of: firstly, adopting a gust of compressed air as the air-extracting working media and the cooling working media, thus achieving convenient field installation and practicability; secondly, adopting the single tube as the supporting tube, thus achieving simplified structure, convenient operation, reducing of volume and weight as well as convenient repair; thirdly, having low production cost; and fourthly, being applicable to the on-line monitoring of boiler smoke temperature and realizing accurate temperature measurement.
Description
Technical field
The utility model relates to a kind of station boiler high-temperature flue gas measurement mechanism, especially a kind of single tube air extracting thermocouple.
Background technology
Present station boiler ubiquity superheater, reheater overtemperature tube burst problem.For addressing this problem, need measure accurately flue-gas temperature.Because these regional flue-gas temperatures higher (usually at 800 ℃～1200 ℃), the ordinary casing thermopair is easily burnt out and measuring error big (60 ℃～150 ℃ of errors), so domesticly at present generally use the infrared ray pyroscope to measure the cigarette temperature, then use the water-cooled air extracting thermocouple in the time of need be than high measurement accuracy.
The shortcoming of far infrared pyroscope be fathom and accuracy not enough, can only monitor the medial temperature of about 2 meters thick flue gases, its accuracy of measurement is subjected to the influence of blackness of exhaustion estimated value simultaneously, error is also bigger; The tested regional heated face structure of burner hearth varies in addition, must carry out blackness of exhaustion estimation (the blackness of exhaustion value between the different heated face structures can differ more than 500%) when testing with the far infrared pyroscope, and test result is had than mistake.
The water-cooled air extracting thermocouple can accurately be measured the cigarette temperature, but its shortcoming is to purchase and operating cost is higher, uses inconvenient.For example: nearly 800,000 yuan of the acquisition expenses of an import water-cooled air extracting thermocouple, the about 150kg of weight must consider carrying, hangs, problems such as chilled water interface and discharging during use, the setup time of test must 7～10 days, about 3～50,000 yuan of expense.
Still there is not the high-temperature flue gas measurement mechanism that to take into account measuring accuracy and convenient test at present both at home and abroad.
Summary of the invention
The purpose of this utility model is for overcoming above-mentioned the deficiencies in the prior art, provide a kind of simple in structure, be convenient to install and use, volume is little, in light weight, be convenient to keep in repair, precision height, cost are low, the single tube air extracting thermocouple that can be used for the boiler smoke on-line temperature monitoring.
For achieving the above object, the utility model adopts following technical proposals:
A kind of single tube air extracting thermocouple comprises thermopair, and the measuring junction outside of described thermopair is equipped with the air ejector of emanating, and the stay pipe of described thermopair is a single tube.
Described thermopair is the thermal shroud suction thermal couple.
The air ejector of emanating in the utility model is installed in the head of air extracting thermocouple (measuring junction), adopts sub-thread pressurized air as bleeding working medium and cooling working medium, and the stay pipe of thermopair is a single tube, the intraductal working medium uniflux.Manage the water-cooled air extracting thermocouple again with routine and compare, following advantage is arranged:
1. adopt sub-thread pressurized air as the working medium of the bleeding cooling working medium of holding concurrently, be convenient to on-the-spot install and practical;
2. stay pipe adopts single tube, and designs simplification is easy to operate, volume-diminished, and maintenance is convenient in weight saving;
3. cost is low;
4. can be used for the boiler smoke on-line temperature monitoring, thermometric is accurate, and the speed of evacuation is adjustable in 30～120m/s scope in its end thermal shroud; But the long period is moved under the condition of high temperature, and its body supports part pipe surface temperature is lower than 600 ℃.Its measuring accuracy can reach ± 7 ℃ (in 800 ~ 1200 ℃ of scopes), and air extracting thermocouple efficient reaches 95%(air extracting thermocouple efficient and reflects its thermometric accuracy, and its calculating formula is: η=(T
d-T
0)/(T
g-T
0), T in the formula
d, T
g, T
0Be respectively air extracting thermocouple thermometric value, flue gas actual temperature, common thermocouple temperature measurement value).Its operation life depends primarily on the life-span of thermopair front end thermal shroud, according to circumstances selects materials such as pottery, aluminium oxide or heat-resisting steel for use, and its life-span was reached more than 8 years, and the expense of replacing thermal shroud is estimated about 4,000 yuan.
Description of drawings
Fig. 1 is the utility model structural representation;
1. stay pipes wherein, 2. emanate air ejector, 3. thermopair.
Embodiment
Below in conjunction with drawings and Examples the utility model is further specified.
Among Fig. 1, a kind of single tube air extracting thermocouple comprises thermopair 3, and the measuring junction outside of described thermopair 3 is equipped with the air ejector 2 of emanating, and the stay pipe of described thermopair 3 is a single tube.
Described thermopair 3 is the thermal shroud suction thermal couple.
The air ejector 2 of emanating in the utility model is installed in the head of thermal shroud suction thermal couple (measuring junction), adopts sub-thread pressurized air as bleeding working medium and cooling working medium, and the stay pipe 1 of thermopair 3 is a single tube, the intraductal working medium uniflux.
Claims (2)
1. a single tube air extracting thermocouple comprises thermopair, it is characterized in that: the measuring junction outside of described thermopair is equipped with the air ejector of emanating, and the stay pipe of described thermopair is a single tube.
2. single tube air extracting thermocouple according to claim 1 is characterized in that: described thermopair is the thermal shroud suction thermal couple.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206244717U CN201867255U (en) | 2010-11-25 | 2010-11-25 | Single-tube air-extracting thermocouple |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206244717U CN201867255U (en) | 2010-11-25 | 2010-11-25 | Single-tube air-extracting thermocouple |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201867255U true CN201867255U (en) | 2011-06-15 |
Family
ID=44138407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206244717U Expired - Fee Related CN201867255U (en) | 2010-11-25 | 2010-11-25 | Single-tube air-extracting thermocouple |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201867255U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931146A (en) * | 2014-03-21 | 2015-09-23 | 中石化洛阳工程有限公司 | Device for measuring furnace flue gas temperature |
| CN105758544A (en) * | 2016-04-26 | 2016-07-13 | 上海电力学院 | Air-exhausting water-cooling type thermocouple temperature measuring device with characteristic of multi-layer heat insulating |
| CN113077692A (en) * | 2021-03-10 | 2021-07-06 | 西安交通大学 | Air transverse single tube forced convection heat transfer teaching experiment device and use method |
-
2010
- 2010-11-25 CN CN2010206244717U patent/CN201867255U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931146A (en) * | 2014-03-21 | 2015-09-23 | 中石化洛阳工程有限公司 | Device for measuring furnace flue gas temperature |
| CN104931146B (en) * | 2014-03-21 | 2019-01-08 | 中石化洛阳工程有限公司 | A kind of measurement chamber flue gas temperature device |
| CN105758544A (en) * | 2016-04-26 | 2016-07-13 | 上海电力学院 | Air-exhausting water-cooling type thermocouple temperature measuring device with characteristic of multi-layer heat insulating |
| CN113077692A (en) * | 2021-03-10 | 2021-07-06 | 西安交通大学 | Air transverse single tube forced convection heat transfer teaching experiment device and use method |
| CN113077692B (en) * | 2021-03-10 | 2022-07-12 | 西安交通大学 | Air transverse single tube forced convection heat transfer teaching experiment device and use method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110615 Termination date: 20151125 |