Thermocouple special for natural gas cracking furnace

Abstract

The utility model provides a thermocouple special for a natural gas cracking furnace. The thermocouple is used for solving the problem that a thermocouple cannot be assembled on the cracking furnace due to the fact that a flange limits the length of a thermocouple protection tube extending into the cracking furnace. The thermocouple special for the natural gas cracking furnace comprises a protection tube, a thermocouple body and a thermocouple body, the flange is used for being connected with an outer shell of the cracking furnace; the flange is movably arranged on the protection pipe in a sleeving mode and detachably assembled on the protection pipe through a first connecting structure.

Description

Technical Field

[0001] The present application relates to the field of natural gas cracking furnaces, and in particular to a thermocouple dedicated to natural gas cracking furnaces. Background Art

[0002] Reference Figure 1 When the thermocouple is assembled on the cracking furnace, the threaded portion 211 of the protection tube 21 passes through the cracking furnace outer shell 11 and is screwed with the threaded hole 121 set on the cracking furnace inner shell 12. At the same time, the flange 23 fixedly mounted on the outer wall of the protection tube 21 is screwed and fixed with the cracking furnace outer shell 11 by bolts.

[0003] Since the high temperature cracking gas in the cracking furnace is as high as 800°C, and the cracking furnace is usually shut down for maintenance after running for one year; when the cracking furnace is shut down, the cracking furnace liner 12 which is in a high temperature state for a long time will deform irregularly. When a new thermocouple needs to be replaced, the length of the protection tube 21 extending into the cracking furnace will change due to the irregular deformation of the cracking furnace liner 12, and the existing flange 23 is fixedly sleeved on the outer periphery of the thermocouple protection tube 21. The assembly position of the flange 23 limits the length of the thermocouple protection tube 21 extending into the cracking furnace, resulting in the inability to assemble the new thermocouple on the cracking furnace. Summary of the invention

[0004] The present application provides a thermocouple dedicated to a natural gas cracking furnace, which is used to solve the problem that the thermocouple cannot be assembled on the cracking furnace because the flange limits the length of the thermocouple protection tube extending into the cracking furnace.

[0005] The technical solution of this application is:

[0006] The present application provides a thermocouple dedicated to a natural gas cracking furnace, and the thermocouple dedicated to a natural gas cracking furnace comprises:

[0007] Protection tube;

[0008] A flange for connection with the outer shell of the cracking furnace;

[0009] The flange is movably sleeved on the protection tube and can be detachably assembled on the protection tube through a first connection structure.

[0010] Preferably, the first connection structure comprises:

[0011] a first nut, the first nut being movably sleeved on the protection tube;

[0012] A first mounting groove is formed on an end surface of the first nut facing the flange, and the first mounting groove has an internal thread;

[0013] One end of the flange with an external thread extends into the first installation groove of the first nut, and the external thread of the flange is threadedly connected with the internal thread of the first installation groove.

[0014] Preferably, the first connection structure further includes:

[0015] A first pressing ring, wherein the first pressing ring is sleeved on the protection tube;

[0016] A first graphite packing, wherein the first graphite packing is sleeved on the protection tube;

[0017] A first end surface of the flange facing the first nut is provided with a first limiting groove arranged around the protection tube;

[0018] A portion of the first pressure ring is limited between the first end surface of the flange and the bottom of the first mounting groove, and another portion extends into the first limiting groove to press the first graphite packing.

[0019] Preferably, the flange and the protection tube are transitionally matched.

[0020] Preferably, the natural gas cracking furnace dedicated thermocouple also includes:

[0021] Junction box;

[0022] A reinforcing tube, wherein the reinforcing tube is fixed on the junction box;

[0023] A thermocouple wire, wherein the wiring end of the thermocouple wire is connected to the wiring port of the wiring box, and the measuring end of the thermocouple wire passes through the reinforcing tube to extend into the cracking gas chamber of the cracking furnace to perform temperature measurement;

[0024] The protection tube is movably sleeved on the reinforcement tube and can be detachably assembled on the reinforcement tube through a second connection structure.

[0025] Preferably, the second connection structure comprises:

[0026] A second nut, which is sleeved on the reinforcing tube, a second mounting groove is formed on an end surface of the second nut facing the protective tube, and the second mounting groove has an internal thread;

[0027] One end of the protection tube with an external thread extends into the second installation groove of the second nut, and the external thread of the protection tube is threadedly connected with the internal thread of the second installation groove.

[0028] Preferably, the second connection structure further includes:

[0029] A second pressing ring, wherein the second pressing ring is sleeved on the reinforcing tube;

[0030] A second graphite packing, wherein the second graphite packing is sleeved on the reinforcement tube;

[0031] Wherein, a second limiting groove arranged around the reinforcing tube is formed on the second end surface of the protection tube facing the second nut;

[0032] A portion of the second pressure ring is limited between the second end surface of the protection tube and the bottom of the second installation groove, and another portion extends into the second limiting groove to press the second graphite packing.

[0033] Preferably, a gap is formed between the protection tube and the reinforcement tube for communicating with the cracking gas chamber in the cracking furnace inner container.

[0034] Preferably, the special thermocouple for the natural gas cracking furnace is a shell-connected thermocouple.

[0035] The beneficial effects of this application are:

[0036] Since the connection mode between the flange and the protection tube is changed from the original fixed connection to a detachable connection through the first connection structure; when the thermocouple needs to be assembled on the cracking furnace with irregular deformation of the cracking furnace liner, the installation position of the flange on the protection tube is adjusted according to the length of the protection tube extending into the cracking furnace, and then the first connection structure and the flange are tightened, so as to realize the assembly of the thermocouple on the cracking furnace with irregular deformation of the cracking furnace liner. In addition, considering that when the thermocouple is installed at different positions of the cracking furnace, the depth of the measuring end of the thermocouple wire extending into the cracking gas chamber of the cracking furnace is different, that is, the depth of the reinforcing tube extending into the cracking gas chamber of the cracking furnace is different, it is necessary to set the protection tube and the reinforcing tube in a relatively movable manner, by detachably connecting the protection tube and the reinforcing tube through the second connection structure, the protection tube and the second connection structure can be tightened after the reinforcing tube is moved into place, and then the protection tube and the reinforcing tube are locked.

[0037] Specifically, the position of the flange on the protection tube is adjusted according to the length of the protection tube extending into the cracking furnace. After the protection tube and the inner tank of the cracking furnace are screwed together, the first nut and the flange are tightened to press the flange against the protection tube; the first pressure ring presses the first graphite packing into the first limiting groove of the flange to improve the sealing performance.

[0038] The relative position between the reinforcing tube and the protective tube is adjusted according to the length of the reinforcing tube extending into the cracking gas chamber of the cracking furnace. After the reinforcing tube is inserted into place, the second nut and the protective tube are tightened to press the protective tube tightly onto the reinforcing tube; the second pressing tube presses the second graphite packing tightly into the second limiting groove of the protective tube, which can prevent the cracking gas from leaking out and improve the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1It is a schematic diagram of the assembly of a thermocouple and a cracking furnace in the prior art;

[0040] Figure 2 This is a schematic diagram of the structure of a thermocouple dedicated to a natural gas cracking furnace in an embodiment of the present application;

[0041] Figure 3 It is a schematic diagram of the assembly of the natural gas cracking furnace dedicated thermocouple and the natural gas cracking furnace in the embodiment of the present application;

[0042] Description of reference numerals: 11 - cracking furnace outer shell; 12 - cracking furnace liner; 101 - cracking gas; 102 - high temperature furnace gas;

[0043] 21-protection tube; 211-second limiting groove; 212-second end surface;

[0044] 22- measuring end;

[0045] 23-flange; 231-first limiting groove; 232-first end face;

[0046] 24-first connection structure; 241-first nut; 242-first pressure ring; 243-first graphite packing; 2411-first installation groove;

[0047] 25-Reinforcement tube;

[0048] 26-second connection structure; 261-second nut; 262-second pressure ring; 263-second graphite packing; 2611-second mounting groove;

[0049] 27-junction box;

[0050] 201-Gap. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0052] Reference Figure 2 and Figure 3 The embodiment of the present application provides a thermocouple dedicated to a natural gas cracking furnace, comprising: a protection tube 21; a flange 23 for connecting to an outer shell 11 of the cracking furnace; the flange 23 is movably mounted on the protection tube 21 and detachably assembled on the protection tube 21 through a first connection structure 24.

[0053] Since the connection mode between the flange 23 and the protection tube 21 is changed from the original fixed connection to a detachable connection through the first connection structure 24; when the thermocouple needs to be assembled on the cracking furnace with irregularly deformed cracking furnace liner 12, the installation position of the flange 23 on the protection tube 21 is first adjusted according to the length of the protection tube 21 extending into the cracking furnace, and then the first connection structure 24 and the flange 23 are fastened, thereby realizing the assembly of the thermocouple on the cracking furnace with irregularly deformed cracking furnace liner 12.

[0054] In order to fix the position of the flange 23 relative to the protective tube 21 after the position is adjusted, in the embodiment of the present application, the first connecting structure 24 includes: a first nut 241, which is movably mounted on the protective tube 21; a first mounting groove 2411 is provided on the end surface of the first nut 241 facing the flange 23, and the first mounting groove 2411 has an internal thread; one end of the flange 23 with an external thread extends into the first mounting groove 2411 of the first nut 241, and the external thread of the flange 23 is threadedly connected with the internal thread of the first mounting groove 2411.

[0055] After the internal thread of the first nut 241 and the external thread of the flange 23 are screwed together, the first nut 241 fastens the flange 23 to the protection tube 21. The position of the flange 23 on the protection tube 21 is adjusted according to the length of the protection tube 21 extending into the cracking furnace. After the protection tube 21 and the cracking furnace inner tank 12 of the cracking furnace are screwed together, the first nut 241 and the flange 23 are tightened. After the internal thread of the first nut 241 and the external thread of the flange 23 are screwed together, the flange 23 can be pressed against the protection tube 21, that is, the position of the flange 23 is fixed.

[0056] In addition, considering that the high temperature furnace gas 102 between the cracking furnace outer shell 11 and the cracking furnace inner shell 12 may leak from the flange 23, Figure 2 and Figure 3 The first connection structure 24 in the embodiment of the present application further includes: a first pressure ring 242, which is sleeved on the protection tube 21; a first graphite packing 243, which is sleeved on the protection tube 21; a first end surface 232 of the flange 23 facing the first nut 241 is provided with a first limiting groove 231 arranged around the protection tube 21; a part of the first pressure ring 242 is limited between the first end surface 232 of the flange 23 and the bottom of the first mounting groove 2411, and the other part extends into the first limiting groove 231 to press the first graphite packing 243.

[0057] By utilizing the good sealing performance, high temperature resistance and corrosion resistance of the first graphite packing 243, the first graphite packing 243 forms a tight seal in the first limiting groove 231 with the outer wall of the protection tube 21 and the inner wall of the flange 23, thereby preventing the high temperature furnace gas 102 of the cracking furnace from leaking out.

[0058] In the embodiment of the present application, in order to enable the flange 23 to move on the protection tube 21 when it is not tightened, the flange 23 and the protection tube 21 are transitionally matched.

[0059] Reference Figure 2 and Figure 3 , the natural gas cracking furnace dedicated thermocouple in the embodiment of the present application also includes:

[0060] Junction box 27;

[0061] A reinforcing tube 25, wherein the reinforcing tube 25 is fixed on the junction box 27;

[0062] A thermocouple wire, the wiring end of the thermocouple wire is connected to the wiring port of the wiring box 27, and the measuring end 22 of the thermocouple wire passes through the reinforcing tube 25 to extend into the cracking gas chamber of the cracking furnace to measure the temperature;

[0063] The protection tube 21 is movably sleeved on the reinforcement tube 25 , and is detachably assembled on the reinforcement tube 25 via a second connection structure 26 .

[0064] In the embodiment of the present application, the junction box 27 can be adaptively designed to meet the explosion-proof requirements to meet the relevant explosion-proof requirements.

[0065] In the embodiment of the present application, welding is used between the protection tube 21 and the measuring end 22 of the thermocouple wire (ie, the probe), and the welding between the protection tube 21 and the measuring end 22 of the thermocouple wire is required to be firm so that no leakage of the cracked gas 101 occurs.

[0066] In the embodiment of the present application, the reinforcing tube 25 mainly plays a role in strengthening the strength.

[0067] In the embodiment of the present application, considering that when the thermocouple is installed at different positions in the cracking furnace, the measuring end 22 of the thermocouple wire needs to extend into the cracking gas chamber of the cracking furnace to different depths, that is, the reinforcing tube 25 extends into the cracking gas chamber of the cracking furnace to different depths, it is necessary to set the protection tube 21 and the reinforcing tube 25 in a relatively movable manner. By detachably connecting the protection tube 21 and the reinforcing tube 25 through the second connecting structure 26, the protection tube 21 and the second connecting structure 26 can be tightened after the reinforcing tube 25 is moved into place, and then the protection tube 21 and the reinforcing tube 25 are locked.

[0068] In order to achieve the relative position fixation between the protection tube 21 and the reinforcement tube 25, refer to Figure 2 and Figure 3 In the embodiment of the present application, the second connection structure 26 includes:

[0069] A second nut 261, which is sleeved on the reinforcing tube 25, and a second mounting groove 2611 is formed on one end surface of the second nut 261 facing the protection tube 21, and the second mounting groove 2611 has an internal thread;

[0070] One end of the protection tube 21 with an external thread extends into the second installation groove 2611 of the second nut 261 , and the external thread of the protection tube 21 is threadedly connected with the internal thread of the second installation groove 2611 .

[0071] The relative position between the reinforcing tube 25 and the protective tube 21 is adjusted according to the length of the reinforcing tube 25 extending into the cracking gas chamber of the cracking furnace. After the reinforcing tube 25 is inserted into place, the second nut 261 and the protective tube 21 are tightened to press the protective tube 21 tightly against the reinforcing tube 25, thereby fixing the relative position between the protective tube 21 and the reinforcing tube 25.

[0072] In the embodiment of the present application, a gap 201 is formed between the protection tube 21 and the reinforcement tube 25 for communicating with the cracking gas chamber in the cracking furnace inner tank 12, and the gap 201 serves as an air circulation chamber for the cracking gas 101. In order to prevent the cracking gas 101 in the air circulation chamber from leaking between the protection tube 21 and the reinforcement tube 25, refer to Figure 2 and Figure 3 In the embodiment of the present application, the second connection structure 26 further includes:

[0073] A second pressing ring 262, which is sleeved on the reinforcing tube 25;

[0074] A second graphite packing 263, wherein the second graphite packing 263 is sleeved on the reinforcing tube 25;

[0075] The second end surface 212 of the protection tube 21 facing the second nut 261 is provided with a second limiting groove 211 surrounding the reinforcement tube 25;

[0076] A portion of the second pressure ring 262 is limited between the second end surface 212 of the protection tube 21 and the bottom of the second installation groove 2611 , and another portion extends into the second limiting groove 211 to press the second graphite packing 263 .

[0077] By utilizing the good sealing performance, high temperature resistance and corrosion resistance of the second graphite packing 263, the second graphite packing 263 forms a tight seal in the second limiting groove 211 with the outer wall of the reinforcing tube 25 and the inner wall of the protective tube 21, thereby preventing the high-temperature cracking gas 101 of the cracking furnace from leaking out.

[0078] In the embodiment of the present application, the special thermocouple for the natural gas cracking furnace is a shell-connected thermocouple.

[0079] In addition, refer to Figure 3 Since the measuring end 22 of the thermocouple wire passes through the protective sleeve and directly extends into the cracking gas chamber in the cracking furnace, the natural gas cracking furnace dedicated thermocouple can quickly measure the temperature of the cracking gas 101 in the cracking gas chamber, that is, the thermocouple is a fast-measuring thermocouple.

[0080] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0081] Although the preferred embodiments of the utility model embodiments have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the utility model embodiments.

[0082] It should also be noted that, in this article, the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, relational terms such as "first" and "second" are used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations, nor can they be understood as indicating or implying relative importance. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or terminal device including a series of elements does not include those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0083] The technical solution provided by the utility model is described in detail above. The principle and implementation method of the utility model are described in this article using specific examples. The description of the above embodiments is only used to help understand the utility model, and the content of this specification should not be understood as limiting the utility model. At the same time, for those skilled in the art, according to the utility model, there will be different forms of changes in the specific implementation methods and application scopes. It is not necessary and impossible to list all the implementation methods here, and the obvious changes or modifications derived from them are still within the protection scope of the utility model.

Claims

1. A thermocouple for natural gas cracking furnace, characterized in that: The special thermocouple for the natural gas cracking furnace comprises: Protective tube (21); A flange (23) for connecting to the outer shell (11) of the cracking furnace; The flange (23) is movably sleeved on the protective tube (21) and is detachably assembled on the protective tube (21) via a first connection structure (24).

2. The special thermocouple for natural gas cracking furnace according to claim 1, characterized in that: The first connection structure (24) comprises: a first nut (241), the first nut (241) being movably sleeved on the protection tube (21); A first mounting groove (2411) is formed on an end surface of the first nut (241) facing the flange (23), and the first mounting groove (2411) has an internal thread; One end of the flange (23) with an external thread extends into the first mounting groove (2411) of the first nut (241), and the external thread of the flange (23) is threadedly connected with the internal thread of the first mounting groove (2411).

3. The special thermocouple for natural gas cracking furnace according to claim 2, characterized in that: The first connection structure (24) further comprises: a first pressing ring (242), the first pressing ring (242) being sleeved on the protection tube (21); a first graphite packing (243), wherein the first graphite packing (243) is sleeved on the protection tube (21); A first end surface (232) of the flange (23) facing the first nut (241) is provided with a first limiting groove (231) arranged around the protective tube (21); A portion of the first pressure ring (242) is limited between the first end surface (232) of the flange (23) and the bottom of the first mounting groove (2411), and another portion extends into the first limiting groove (231) to press the first graphite packing (243).

4. The special thermocouple for natural gas cracking furnace according to claim 1, characterized in that: The flange (23) and the protection tube (21) are transitionally matched.

5. The special thermocouple for natural gas cracking furnace according to claim 1, characterized in that: The special thermocouple for the natural gas cracking furnace also includes: Junction box (27); A reinforcing tube (25), wherein the reinforcing tube (25) is fixed on the junction box (27); A thermocouple wire, wherein the wiring end of the thermocouple wire is connected to the wiring port of the wiring box (27), and the measuring end (22) of the thermocouple wire passes through the reinforcing tube (25) to extend into the cracking gas chamber of the cracking furnace to perform temperature measurement; The protection tube (21) is movably sleeved on the reinforcement tube (25) and is detachably assembled on the reinforcement tube (25) via a second connection structure (26).

6. The special thermocouple for natural gas cracking furnace according to claim 5, characterized in that: The second connection structure (26) comprises: a second nut (261), which is sleeved on the reinforcing tube (25); a second mounting groove (2611) is provided on an end surface of the second nut (261) facing the protective tube (21); the second mounting groove (2611) has an internal thread; One end of the protection tube (21) with an external thread extends into the second installation groove (2611) of the second nut (261), and the external thread of the protection tube (21) is threadedly connected with the internal thread of the second installation groove (2611).

7. The special thermocouple for natural gas cracking furnace according to claim 6, characterized in that: The second connection structure (26) further includes: a second pressing ring (262), the second pressing ring (262) being sleeved on the reinforcing tube (25); A second graphite packing (263), wherein the second graphite packing (263) is sleeved on the reinforcement tube (25); Wherein, a second end surface (212) of the protection tube (21) facing the second nut (261) is provided with a second limiting groove (211) arranged around the reinforcement tube (25); A portion of the second pressure ring (262) is limited between the second end surface (212) of the protection tube (21) and the bottom of the second mounting groove (2611), and another portion extends into the second limiting groove (211) to press the second graphite packing (263).

8. The special thermocouple for natural gas cracking furnace according to claim 6 or 7, characterized in that: A gap (201) is formed between the protection tube (21) and the reinforcement tube (25) for communicating with the cracking gas chamber in the cracking furnace inner container (12).

9. The special thermocouple for natural gas cracking furnace according to claim 1, characterized in that: The special thermocouple for the natural gas cracking furnace is a shell-connected thermocouple.

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