CN211976868U - Protective device for circulating fluidized bed temperature thermocouple - Google Patents
Protective device for circulating fluidized bed temperature thermocouple Download PDFInfo
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- CN211976868U CN211976868U CN202020620875.2U CN202020620875U CN211976868U CN 211976868 U CN211976868 U CN 211976868U CN 202020620875 U CN202020620875 U CN 202020620875U CN 211976868 U CN211976868 U CN 211976868U
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Abstract
The utility model discloses a protective device for a circulating fluidized bed temperature thermocouple, a wear-resistant thermocouple is arranged in the protective device, the protective device comprises a wall bushing and a protective bushing in a furnace, the tail part of the wall bushing is fixed in a boiler body, a second flange is arranged on the wall bushing, the second flange is positioned outside the boiler body, a first flange is arranged on the wear-resistant thermocouple, and the first flange is connected with the second flange through a bolt component; the tail end of the protective sleeve in the furnace is provided with a sleeve positioning section in the furnace, a screw hole is formed in the sleeve positioning section in the furnace, and the sleeve positioning section in the furnace comprehensively covers the wear-resistant thermocouple stretching into the furnace and is connected and positioned at the tail end of the wear-resistant thermocouple through the screw hole. The utility model discloses simple structure easily draws materials and makes, and the maintenance cost is low, and wear-resisting thermocouple work is in a space that does not receive impact and wearing and tearing, ensures wear-resisting thermocouple and the normal heat exchange of flue gas and effectively slows down wearing and tearing, has improved temperature element's life.
Description
Technical Field
The utility model relates to an accessory technical field on the circulating fluidized bed boiler especially relates to a protector for circulating fluidized bed temperature thermocouple.
Background
The circulating fluidized bed boiler is one of clean coal combustion technologies with the highest industrialization degree, and has the outstanding advantages of wide fuel adaptability, high combustion efficiency, low nitrogen oxide emission, large load regulation ratio, quick load regulation and the like. The main characteristic is that the boiler furnace contains a large amount of coal particles with the particle size less than 10mm, a large amount of materials flow out of the furnace along with the flue gas in the combustion process and are separated from the flue gas in the cyclone separator, and the separated particles can directly return to the furnace or enter the furnace again through the external heat exchanger, so that multiple circulating combustion is realized. Because the material concentration in the circulating fluidized bed boiler is relatively high and high-wind-speed matching is needed, the abrasion of the circulating fluidized bed boiler body and internal measuring points is serious directly, and the problem becomes the first problem restricting the development of the circulating fluidized bed boiler.
The combustion temperature in the hearth of the circulating fluidized bed boiler is about 900-1000 ℃, a large amount of materials are fluidized under the action of wind pressure to achieve the purpose of full combustion, ten temperature measuring points are uniformly distributed at the fluidized bed part of the boiler in order to prevent the hearth from coking due to high temperature, but the temperature measuring thermocouples are seriously worn when the hearth is in a high-temperature and high-material flow-rate environment for a long time.
The classification of temperature measurement today can be divided into contact and non-contact by whether it is in contact with the object being measured. The contact type measuring instrument has the advantages of simplicity, reliability, high temperature measurement accuracy and the like, but because the temperature measuring element and a measured medium need to perform sufficient heat exchange, the contact type measuring instrument has the phenomenon of temperature measurement delay, is limited by high-temperature-resistant and wear-resistant materials, and has higher requirements on the temperature measurement environment. In consideration of the above, a ceramic sleeve thermocouple is adopted, but the severe change of the environmental temperature can cause the ceramic protective sleeve to crack, so that the thermocouple core is directly abraded, the operation period is shorter, and the cost investment is higher. The non-contact instrument measures temperature by the principle of thermal radiation, a temperature element does not need to be in contact with a measured medium, the temperature measuring range is wide, the temperature measuring instrument is not limited by the upper limit of the measured temperature, the reaction speed is high, the problem of abrasion caused by contact is solved well, the influence of external factors such as measuring distance, smoke dust and water vapor is caused, and the measuring error is large. An infrared measurement method is designed for measuring the temperature, but after the operation for a period of time, the fluidization effect of materials in a hearth can cause a large amount of materials to be accumulated in a measuring point, so that infrared rays emitted by an infrared instrument cannot reach a flame part, and the measurement requirement cannot be met.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a protector for circulating fluidized bed temperature thermocouple solves the problem of impact and the wearing and tearing of prior art material to the thermocouple body.
In order to solve the technical problem, the utility model adopts the following technical scheme:
the utility model relates to a protector for circulating fluidized bed temperature thermocouple, install wear-resisting thermocouple in this protector, including wall bushing and in-furnace protective casing, the wall bushing passes boiler heat preservation, water-cooling wall, revetment layer in proper order, the afterbody of wall bushing is fixed in the boiler body, be provided with the second flange on the wall bushing, the second flange is located outside the boiler body, be provided with the first flange on the wear-resisting thermocouple, the first flange passes through bolt assembly and is connected with the second flange; the tail end of the protective sleeve in the furnace is provided with a sleeve positioning section in the furnace, the sleeve positioning section in the furnace is provided with a screw hole, and the sleeve positioning section in the furnace completely covers the wear-resistant thermocouple stretching into the furnace and penetrates through the screw hole through a screw to be connected and positioned at the tail end of the wear-resistant thermocouple.
Furthermore, the first flange is welded on one side, close to the thermocouple head, of the wear-resistant thermocouple, a flange diaphragm is added between the first flange and the second flange, and the flange diaphragm is sleeved on the wear-resistant thermocouple.
Furthermore, the wall bushing and the protective bushing in the furnace are made of high-temperature nickel-based alloy.
Still further, the length of the wear-resistant thermocouple extending into the boiler is not less than 400 mm.
Still further, the total length of the protective sleeve II in the furnace is not less than 420mm, and the positioning section III of the sleeve in the furnace protrudes out of the tail end 9 of the wear-resistant thermocouple by at least 20 mm.
Still further, the screw specifically adopts corrosion-resistant, wear-resistant and high temperature resistant screw, and the head of screw supports on the circumference lateral wall of wear-resistant thermocouple tail end.
Compared with the prior art, the utility model discloses a beneficial technological effect:
the utility model relates to a protector for be used for circulating fluidized bed temperature thermocouple, including wall bushing, interior protective sleeve of stove and stove interior sleeve pipe location section, the wall bushing is close to thermocouple odd one side and passes through welded first flange joint together on second flange and the wear-resisting thermocouple, and interior protective sleeve of stove and the interior sleeve pipe location section butt welding link together form the inner casing, and wear-resisting thermocouple is installed in protector's hole, especially the inside whole inner casings that are in of boiler. The utility model discloses protector's design need not to change current thermocouple measuring position and mounting means, need not to increase other auxiliary fittings on the boiler body, device simple structure, easily draw materials and make, and the maintenance cost is low for temperature element thermocouple work is in a space that does not receive impact and wearing and tearing, ensures wear-resisting thermocouple and the normal heat exchange of flue gas and effectively slows down the wearing and tearing to it simultaneously, has improved temperature element's life, has guaranteed boiler operation cycle's demand.
Drawings
The present invention will be further explained with reference to the following description of the drawings.
FIG. 1 is a schematic view of the protection device for the circulating fluidized bed temperature thermocouple of the present invention;
FIG. 2 is a schematic view of the internal usage state of the boiler of the present invention;
description of reference numerals: 1. a wear-resistant thermocouple; 2. a thermocouple head; 3. a first flange; 4. a flange diaphragm; 5. a second flange; 6. a bolt assembly; 7. a screw hole; 8. a screw; 9. the tail end of the wear-resistant thermocouple; i, a wall bushing; II, protecting a sleeve in the furnace; III, a sleeve positioning section in the furnace.
Detailed Description
As shown in fig. 1-2, a protection device for a circulating fluidized bed temperature thermocouple, wherein a wear-resistant thermocouple 1 is installed in the protection device, and comprises a wall bushing i and a protective bushing ii in a boiler, the wall bushing i sequentially penetrates through a boiler heat insulation layer, a water-cooled wall and a protective wall layer, the tail part of the wall bushing i is fixed in a boiler body, a second flange 5 is arranged on the wall bushing i, the second flange 5 is positioned outside the boiler body, a first flange 3 is arranged on the wear-resistant thermocouple 1, and the first flange 3 is connected with the second flange 5 through a bolt assembly 6; the tail end of the protective sleeve II in the furnace is provided with a sleeve positioning section III in the furnace, a screw hole 7 is formed in the sleeve positioning section III in the furnace, the sleeve positioning section III in the furnace covers the wear-resistant thermocouple 1 extending into the furnace comprehensively and penetrates through the screw hole 7 to be connected and positioned at the tail end 9 of the wear-resistant thermocouple through a screw 8. The connection mode of the in-furnace protective sleeve II and the in-furnace sleeve positioning section III with the wear-resistant thermocouple 1 well avoids the action of fire operation on a water-cooled wall of the boiler, and is slightly improved on the basis of the original operation mode; the wear-resistant thermocouple is used for fixing the protective sleeve in the furnace, the furnace shutdown maintenance is convenient, and the problem that the sleeve and the wear-resistant thermocouple are difficult to remove due to curing caused by long-term operation is well solved.
The first flange 3 is welded on the wear-resistant thermocouple 1 and is close to one side of the thermocouple head 2, a flange diaphragm 4 is added between the first flange 3 and the second flange 5, and the flange diaphragm 4 is sleeved on the wear-resistant thermocouple 1. The design of the flange diaphragm 4 ensures that the two flanges are parallel and airtight, and avoids the phenomenon of combustion material injection caused by looseness in the operation process.
Specifically, high-temperature nickel-based alloy is selected for use as the material of the wall bushing I and the protective bushing II in the furnace, so that the abrasion of the wear-resistant thermocouple 1 for temperature measurement and the smoke corrosion at high temperature can be effectively slowed down, the service life of the protective bushing II in the furnace is prolonged, the use times of the protective bushing is effectively prolonged, and the replacement of the wear-resistant thermocouple is reduced.
As shown in fig. 2, the length of the wear-resistant thermocouple 1 extending into the boiler is not less than 400mm, and the total length of the protective sleeve II in the boiler is not less than 420mm, so that the temperature measurement requirement of the wear-resistant thermocouple is ensured, and the wear problem of the wear-resistant thermocouple can be well solved; and the furnace inner sleeve positioning section III protrudes out of the tail end of the wear-resistant thermocouple by 9 mm or more, so that the wear to the wear-resistant thermocouple can be reduced, and a better protection effect is realized.
Specifically, the screw 8 is a corrosion-resistant, wear-resistant and high-temperature-resistant screw, and the head of the screw 8 abuts against the circumferential side wall of the tail end 9 of the wear-resistant thermocouple; prevent that a large amount of fuel from carrying out fluidization wearing and tearing wear-resisting thermocouple 1 under the effect of wind pressure and stretching into the stove inside and prevent that the protective sheath drops and the influence of self vibrations to the boiler body.
The utility model discloses a use as follows:
in the installation of the utility model, a wall bushing I is fixedly installed on a boiler body, the outer end of the wall bushing I is provided with a second flange 5, and a protective sleeve II in a furnace comprises a furnace bushing positioning section III at the end part and is a protective sleeve which can be flexibly installed in the furnace; firstly, welding a first flange 3 on a specified position of a wear-resistant thermocouple 1, and sleeving a flange diaphragm 4 between the first flange 3 and a second flange 5; secondly, the working end of the wear-resistant thermocouple 1 penetrates through the wall bushing I and then extends into the boiler, and bolts of the bolt assembly 6 sequentially penetrate through the first flange 3, the flange diaphragm 4 and the second flange 5 and then are screwed together through nuts; then, sleeving a protective sleeve II in the boiler on a wear-resistant thermocouple 1 in the boiler; and finally, penetrating a screw 8 through a screw hole 7 on the positioning section III of the sleeve in the furnace, and positioning and connecting the protective sleeve II in the furnace to the tail end 9 of the wear-resistant thermocouple.
The utility model discloses a thermocouple protector, wall bushing I and the interior lag tube II of stove cooperate in order for wear-resisting thermocouple 1 work has both guaranteed wear-resisting thermocouple 1's the heating surface in a space that does not receive impact and wearing and tearing, effectively protects its integrality again, has improved life, has reduced the change number of times, practices thrift maintenance cost and time.
The above-mentioned embodiments are only intended to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and those skilled in the art should also be able to make various modifications and improvements to the technical solution of the present invention without departing from the spirit of the present invention, and all such modifications and improvements are intended to fall within the scope of the present invention as defined in the appended claims.
Claims (6)
1. The utility model provides a protector for circulating fluidized bed temperature thermocouple, installs wear-resisting thermocouple (1) in this protector, its characterized in that: the boiler wall-through sleeve comprises a wall-through sleeve (I) and a protective sleeve (II) in the boiler, wherein the wall-through sleeve (I) sequentially penetrates through a boiler heat-insulating layer, a water-cooled wall and a protective wall layer, the tail part of the wall-through sleeve (I) is fixed in a boiler body, a second flange (5) is arranged on the wall-through sleeve (I), the second flange (5) is positioned outside the boiler body, a first flange (3) is arranged on a wear-resistant thermocouple (1), and the first flange (3) is connected with the second flange (5) through a bolt component (6); the tail end of the protective sleeve (II) in the furnace is provided with a sleeve positioning section (III) in the furnace, a screw hole (7) is formed in the sleeve positioning section (III) in the furnace, the sleeve positioning section (III) in the furnace covers the wear-resistant thermocouple (1) extending into the furnace comprehensively and penetrates through the screw hole (8) to be connected and positioned at the tail end (9) of the wear-resistant thermocouple.
2. The protector for a circulating fluidized bed temperature thermocouple according to claim 1, wherein: the first flange (3) is welded on one side, close to the thermocouple head (2), of the wear-resistant thermocouple (1), a flange diaphragm (4) is added between the first flange (3) and the second flange (5), and the flange diaphragm (4) is sleeved on the wear-resistant thermocouple (1).
3. The protector for a circulating fluidized bed temperature thermocouple according to claim 1, wherein: the wall bushing (I) and the in-furnace protective bushing (II) are made of high-temperature nickel-based alloy.
4. The protector for a circulating fluidized bed temperature thermocouple according to claim 1, wherein: the length of the wear-resistant thermocouple (1) extending into the boiler is not less than 400 mm.
5. The protector for a circulating fluidized bed temperature thermocouple according to claim 1, wherein: the total length of the protective sleeve (II) in the furnace is not less than 420mm, and the positioning section (III) of the sleeve in the furnace protrudes out of the tail end (9) of the wear-resistant thermocouple by at least 20 mm.
6. The protector for a circulating fluidized bed temperature thermocouple according to claim 1, wherein: the screw (8) is corrosion-resistant, wear-resistant and high-temperature-resistant, and the head of the screw (8) abuts against the circumferential side wall of the tail end (9) of the wear-resistant thermocouple.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020620875.2U CN211976868U (en) | 2020-04-23 | 2020-04-23 | Protective device for circulating fluidized bed temperature thermocouple |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020620875.2U CN211976868U (en) | 2020-04-23 | 2020-04-23 | Protective device for circulating fluidized bed temperature thermocouple |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211976868U true CN211976868U (en) | 2020-11-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020620875.2U Active CN211976868U (en) | 2020-04-23 | 2020-04-23 | Protective device for circulating fluidized bed temperature thermocouple |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211976868U (en) |
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2020
- 2020-04-23 CN CN202020620875.2U patent/CN211976868U/en active Active
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