Fluidized bed boiler hearth thermocouple mounting structure

Abstract

The utility model relates to the technical field of boilers, and discloses a fluidized bed boiler hearth thermocouple installation structure which comprises a hearth wall and a thermocouple, and the hearth wall is provided with an installation pipe used for installing the thermocouple. The end, located in the hearth, of the installation pipe is an inclined face, and a cover plate used for covering an opening of the installation pipe is rotationally installed at the top of the inclined face. The thermocouple further comprises a sleeve movably arranged in the mounting pipe, the length of the sleeve is larger than that of the mounting pipe, the outer end of the sleeve is provided with a first flange connected with the thermocouple and a second flange connected with the mounting pipe, and the second flange is connected with the flange plate of the mounting pipe through a plurality of fasteners. The thermocouple is fixedly installed in the sleeve, and the temperature measuring end of the thermocouple extends out of the sleeve. According to the utility model, the problems that flames in a hearth jump out and the thermocouple is difficult to disassemble when the thermocouple is disassembled are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of boilers, in particular to a fluidized bed boiler furnace thermocouple installation structure. Background Art

[0002] Fluidized bed boilers utilize a fluidized bed combustion method and can be categorized as bubbling fluidized bed boilers and circulating fluidized bed boilers based on their fluid dynamic characteristics. During operation, fluidized bed boilers require thermocouples to monitor the combustion temperature within the furnace to ensure proper operation. Existing boiler furnace thermocouple mounting structures typically involve installing a mounting tube on the wall of the fluidized bed furnace, into which the thermocouple is directly inserted and fixed. This mounting method causes the sulfide and dust produced by the combustion of pulverized coal within the furnace to mix and easily form scale within the mounting tube. Once excessive scale forms, the thermocouple adheres directly to the mounting tube, making it impossible to remove during maintenance. Because the thermocouple is subject to erosion by the pulverized coal, it requires regular maintenance or replacement. If the thermocouple adheres, it becomes difficult to remove, necessitating shutdown and maintenance, disrupting normal production. Even if it is removed, the fire within the furnace can escape through the mounting tube, posing a potential risk to the safe operation of the boiler.

[0003] Based on this, the present application provides a fluidized bed boiler furnace thermocouple installation structure that is easy to inspect and repair thermocouples and will not cause flames to burst out during inspection to solve the above problems. Utility Model Content

[0004] The utility model aims to solve the technical problems existing in the prior art. To this end, the utility model provides a fluidized bed boiler furnace thermocouple installation structure that is convenient for repairing thermocouples and does not cause flames to escape during repair.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] Provided is a fluidized bed boiler furnace thermocouple mounting structure, comprising a furnace wall and a thermocouple, wherein the furnace wall is provided with a mounting tube for mounting the thermocouple; one end of the mounting tube located in the furnace is configured as an inclined surface, and a cover plate for covering the pipe opening of the mounting tube is rotatably mounted on the top of the inclined surface; the structure also comprises a sleeve, which is movably arranged in the mounting tube, has a length greater than that of the mounting tube, and an outer end of the sleeve is provided with a first flange connected to the thermocouple and a second flange connected to the mounting tube, wherein the second flange is connected to the flange plate of the mounting tube by a plurality of fasteners; the thermocouple is fixedly mounted in the sleeve, and its temperature measuring end extends out of the sleeve.

[0007] In some optional embodiments, the end of the sleeve away from the first flange is further provided with a push rod for pushing open the cover plate.

[0008] In some optional embodiments, the fastener includes a half-thread bolt and a fastening nut, the fastening nut is screwed into the rod by the threaded portion of the half-thread bolt, the threaded portion of the half-thread bolt passes through the through hole of the second flange and is screwed to the screw hole on the flange plate of the mounting tube, and the second flange and the flange plate of the mounting tube are fastened by the fastening nut.

[0009] In some optional embodiments, a spring is further sleeved on the sleeve, one end of the spring abuts against the second flange, and the other end abuts against the flange plate of the mounting pipe.

[0010] In some optional embodiments, the length of the half-thread bolt is sufficient to allow the sleeve and the thermocouple to be withdrawn into the mounting tube without affecting the closing of the cover.

[0011] In some optional embodiments, a telescopic protective sleeve is further provided between the second flange and the flange plate of the mounting pipe.

[0012] In some optional embodiments, the outer diameter of the sleeve matches the inner diameter of the mounting tube.

[0013] In some optional embodiments, the inner cavity of the end of the sleeve away from the first flange is set as a necked cavity, and the inner diameter of the necked cavity matches the outer diameter of the temperature measuring rod of the thermocouple.

[0014] In some optional embodiments, a tapered guide cavity is provided between the inner cavity of the sleeve and the necking cavity.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. The thermocouple installation structure designed in this utility model is that when the thermocouple needs to be disassembled, the fasteners are loosened and the sleeve is pulled out. The cover on the installation pipe is closed under the action of its own weight, and the problem of flames in the furnace will not occur. During installation, the cover can also be pushed open by the sleeve, which does not affect the normal installation of the thermocouple.

[0017] 2. The designed fasteners can tighten the sleeve and, after loosening the loose nut, can also limit the sleeve's withdrawal length. When the sleeve is pulled out to the set length, the cover can be closed. At this time, the thermocouple can be disassembled and assembled normally without the problem of flames. At the same time, this structure does not require the sleeve to be completely removed.

[0018] 3. The outer diameter of the sleeve is matched with the outer diameter of the mounting tube (for a small clearance fit), which can effectively prevent the sleeve and the mounting tube from adhering due to scaling; the neck cavity provided in the sleeve is matched with the temperature measuring rod of the thermocouple (for a small clearance fit), which can also effectively prevent the sleeve and the temperature measuring rod from adhering due to scaling. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. Among them:

[0020] Figure 1 This is an assembly cross-sectional view of the fluidized bed boiler furnace thermocouple installation structure provided by the utility model;

[0021] Figure 2 It is a cross-sectional view of the fluidized bed boiler furnace thermocouple installation structure provided by the utility model in a state where the thermocouple is removed.

[0022] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0023] Furnace wall 1, mounting tube 2, thermocouple 3, sleeve 4, first flange 4.1, second flange 4.2, push rod 4.3, necking cavity 4.4, guide cavity 4.5, fastener 5, half-thread bolt 5.1, fastening nut 5.2, cover plate 6, spring 7, protective sleeve 8. DETAILED DESCRIPTION

[0024] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed or operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0027] In addition, the descriptions involving the terms "first", "second", etc. in the present invention are for descriptive purposes only and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. The terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0029] Example 1

[0030] As attached Figure 1 and attached Figure 2 As shown, this embodiment provides a fluidized bed boiler furnace thermocouple installation structure, including a furnace wall 1, a mounting pipe 2, a thermocouple 3, a sleeve 4 and a fastener 5, wherein:

[0031] The mounting tube 2 is arranged on the furnace wall 1, and one end thereof located inside the furnace is set as an inclined surface. A cover plate 6 for covering the pipe opening of the mounting tube 2 is rotatably installed on the top of the inclined surface; under normal conditions, the cover plate automatically closes the mounting tube under the action of its own weight.

[0032] The outer diameter of the sleeve 4 matches the inner diameter of the mounting tube 2, specifically a small clearance fit, which can effectively prevent the sleeve and the mounting tube from adhering to each other due to scaling; the sleeve 4 is movably arranged in the mounting tube 2, its length is greater than the length of the mounting tube 2, and its outer end is provided with a first flange 4.1 connected to the thermocouple 3 and a second flange 4.2 connected to the mounting tube 2, and the second flange 4.2 is connected to the flange plate of the mounting tube 2 by multiple fasteners 5; the end of the sleeve 4 away from the first flange 4.1 is also provided with a push rod 4.3 for pushing open the cover plate; the inner cavity of the end of the sleeve 4 away from the first flange 4.1 is set as a necked cavity 4.4, the inner diameter of the necked cavity 4.4 matches the outer diameter of the temperature measuring rod of the thermocouple 3, specifically a small clearance fit, which can also effectively prevent the sleeve and the temperature measuring rod from adhering to each other due to scaling. A tapered guide cavity 4.5 is provided between the inner cavity of the sleeve 4 and the neck cavity 4.4. The guide cavity can play a role in positioning and guiding the thermocouple after it is inserted into the sleeve.

[0033] The thermocouple 3 is fixedly installed in the sleeve 4 , and its temperature measuring end extends out of the sleeve 4 .

[0034] During assembly, first insert the thermocouple into the sleeve and fix it on the first flange, then insert the sleeve into the mounting tube. As the sleeve is inserted, the cover plate on the mounting tube is pushed open, and finally the second flange of the sleeve is fixedly connected to the flange plate on the mounting tube through fasteners.

[0035] When the thermocouple needs to be removed, loosen the fasteners and pull out the sleeve. At this time, the cover covers the installation tube and the thermocouple can be removed.

[0036] Example 2

[0037] Repeating Example 1, this embodiment further designs the fastener, as shown in the attached Figure 1 and attached Figure 2 As shown, the fastener 5 includes a half-thread bolt 5.1 and a fastening nut 5.2. The fastening nut 5.2 is screwed into the rod by the threaded portion of the half-thread bolt 5.1. The threaded portion of the half-thread bolt 5.1 passes through the through hole of the second flange 4.2 and is screwed to the screw hole on the flange plate of the mounting pipe 2. The second flange 4.2 and the flange plate of the mounting pipe 2 are fastened by the fastening nut 5.2.

[0038] Preferably, a spring 7 is further sleeved on the sleeve 4, one end of the spring 7 abuts against the second flange, and the other end abuts against the flange plate of the mounting pipe.

[0039] Preferably, the length of the half-thread bolt 5.1 is sufficient to allow the sleeve 4 and the thermocouple 3 to be withdrawn into the mounting tube 2 without affecting the closing of the cover plate 6.

[0040] The fastener designed in this embodiment can use the head of the half-thread bolt to limit the sleeve, and the spring provides elastic force. When the thermal couple needs to be disassembled, the fastening nut is withdrawn from the threaded part of the half-thread bolt. At this time, the sleeve is partially withdrawn from the installation tube under the elastic force of the spring, as shown in the attached Figure 2 As shown, the cover can now be closed and the thermocouple can be removed from the sheath. This fastener does not require the sheath to be completely removed.

[0041] Example 3

[0042] Repeat Example 2, as shown in the attached Figure 1 and attached Figure 2 As shown, in this embodiment, a telescopic protective sleeve 8 is further provided between the second flange 4.2 and the flange plate of the mounting pipe 2 to prevent the heated sleeve from being exposed to the maintenance personnel.

[0043] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A fluidized bed boiler furnace thermocouple mounting structure, comprising a furnace wall and a thermocouple, wherein the furnace wall is provided with a mounting tube for mounting the thermocouple; characterized in that: One end of the installation pipe located in the furnace is set as an inclined surface, and a cover plate for covering the pipe opening of the installation pipe is rotatably installed on the top of the inclined surface; The invention also includes a sleeve, which is movably arranged in the mounting pipe, has a length greater than the length of the mounting pipe, and an outer end of the sleeve is provided with a first flange connected to the thermocouple and a second flange connected to the mounting pipe, and the second flange is connected to the flange plate of the mounting pipe by a plurality of fasteners; The thermocouple is fixedly installed in the sleeve, and the temperature measuring end thereof extends out of the sleeve.

2. The fluidized bed boiler furnace thermocouple installation structure according to claim 1, characterized in that: The end of the sleeve away from the first flange is also provided with a push rod for pushing open the cover plate.

3. The fluidized bed boiler furnace thermocouple installation structure according to claim 1, characterized in that: The fastener includes a half-thread bolt and a fastening nut. The fastening nut is screwed into the rod through the threaded portion of the half-thread bolt. The threaded portion of the half-thread bolt passes through the through hole of the second flange and is screwed to the screw hole on the flange plate of the mounting pipe. The second flange and the flange plate of the mounting pipe are fastened by the fastening nut.

4. The fluidized bed boiler furnace thermocouple installation structure according to claim 3, characterized in that: A spring is also sleeved on the sleeve, one end of the spring abuts against the second flange, and the other end abuts against the flange plate of the mounting pipe.

5. The fluidized bed boiler furnace thermocouple installation structure according to claim 3, characterized in that: The length of the half-thread bolt is sufficient to allow the sleeve and the thermocouple to be retracted into the installation tube without affecting the closing of the cover.

6. The fluidized bed boiler furnace thermocouple installation structure according to claim 3, characterized in that: A telescopic protective sleeve is further provided between the second flange and the flange plate of the mounting pipe.

7. The fluidized bed boiler furnace thermocouple installation structure according to claim 1, characterized in that: The outer diameter of the sleeve matches the inner diameter of the mounting tube.

8. The fluidized bed boiler furnace thermocouple installation structure according to claim 1, characterized in that: The inner cavity of the end of the sleeve away from the first flange is set as a necked cavity, and the inner diameter of the necked cavity matches the outer diameter of the temperature measuring rod of the thermocouple.

9. The fluidized bed boiler furnace thermocouple installation structure according to claim 8, characterized in that: A tapered guide cavity is provided between the inner cavity of the sleeve and the neck cavity.

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