A multi-point temperature measuring thermocouple for a gasification furnace

Abstract

The utility model relates to temperature measurement thermocouple technical field, concretely relates to a kind of for gasification furnace multipoint temperature measurement thermocouple, including junction box, secondary sealing assembly, first high-pressure sealing assembly, flange assembly, second high-pressure sealing assembly, high-temperature thermocouple, armoured thermocouple and thermometer casing, the connecting place of thermometer casing and high-temperature thermocouple is equipped with leakage-proof structure, cold end lead wire inside high-temperature thermocouple and armoured thermocouple all pass through secondary sealing assembly and the terminal connection in the junction box, the utility model can effectively prevent medium condensation corrosion liquid to form the corrosion damage damage of armoured core, first high-pressure sealing assembly or second high-pressure sealing assembly can effectively prevent medium into atmosphere environment in the case of failure, provide valuable processing time when giving present leakage event.

Description

Technical Field

[0001] This utility model relates to the field of temperature measurement thermocouple technology, and in particular to a multi-point temperature measurement thermocouple for gasifiers. Background Technology

[0002] The gasifier is an indispensable piece of equipment in fertilizer production, and its normal and safe operation is crucial to the safety and profitability of the fertilizer plant. During normal operation, the gasifier's internal temperature exceeds 1200℃, the pressure is greater than 5 MPa, and the process medium is syngas (including H2, CO, CO2, H2S, and solid particles). Its interior comprises three key areas: the furnace chamber, the water-cooled walls, and the annular cavity. The furnace chamber is the core space where the coal and gasifying agent undergo a high-temperature reaction, operating at temperatures of 1200-1800℃. The water-cooled walls are tubular heat exchange structures surrounding the furnace chamber, absorbing heat through water circulation to control the furnace temperature and protect the furnace body. The annular cavity is a sealed space between the outer side of the water-cooled walls and the furnace shell, requiring a stable temperature to prevent heat loss or structural deformation.

[0003] Currently, the industry mostly adopts a decentralized single-point temperature measurement scheme for temperature monitoring in these three areas: for the furnace, a single thermocouple is inserted through a hole between the water-cooled wall tubes to achieve local temperature acquisition; for the water-cooled wall, an external wall-mounted resistance temperature detector is used to monitor the tube wall temperature; for the annular cavity, a temperature measurement point is set up to record the average temperature of the area.

[0004] Existing gasifiers with multi-point thermocouples only seal the thermocouple core through the flange sealing structure (packing seal or welding seal), without multi-layer leak prevention measures, resulting in poor safety performance. They also lack disassembly and adjustable insertion depth functions, leading to unsatisfactory performance. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a multi-point temperature measurement thermocouple for gasifiers to solve the problems mentioned in the background art.

[0006] Based on the above objectives, this utility model provides a multi-point temperature measurement thermocouple for a gasifier, comprising a junction box, a secondary sealing assembly, a first high-pressure sealing assembly, a flange assembly, a second high-pressure sealing assembly, a high-temperature thermocouple, an armored thermocouple, and a thermometer sheath. One end of the secondary sealing assembly is fixedly connected to the junction box, and the other end is fixedly connected to the flange assembly. The first high-pressure sealing assembly is disposed inside the secondary sealing assembly. One end of the second high-pressure sealing assembly is fixedly connected to the end of the flange assembly away from the secondary sealing assembly. One end of the high-temperature thermocouple and the armored thermocouple are sequentially inserted into the second high-pressure sealing assembly, the flange assembly, and the first high-pressure sealing assembly and connected as a whole. The other end of the high-temperature thermocouple is connected to one end of the thermometer sheath. The other end of the thermometer sheath is tightly fixed to the equipment installation port. A leak-proof structure is provided at the connection between the thermometer sheath and the high-temperature thermocouple. The cold junction leads inside the high-temperature thermocouple and the armored thermocouple pass through the secondary sealing assembly and are connected to the terminals inside the junction box.

[0007] Preferably, the secondary sealing assembly includes an inlet screw, a sealing screw, a first clamping nut, a sealing cover, a clamping screw, a first pressure block, and PTFE filler, all fitted onto the cold end lead wire. One end of the inlet screw is fixed to one end of the junction box, and the other end is fitted onto the sealing screw and fixedly connected. The free end of the sealing screw is fixedly connected to the first clamping nut. The first clamping nut is located at one end of the sealing cover. The sealing cover is fitted onto the flange assembly and fixedly connected. One end of the clamping screw is located inside the inlet screw, and the other end is inserted into the sealing screw. One end of the first pressure block is fitted onto the clamping screw, and the other end is filled with PTFE filler. A sealing cavity interface is provided on the outer wall of the sealing cover.

[0008] Preferably, the flange assembly includes a flange body and a sealing cover. One end of the flange body is disposed inside the sealing cover and fixedly connected, and the other end is fixedly connected to one end of the sealing cover. A copper gasket is provided between the flange body and the sealing cover.

[0009] Preferably, the first high-pressure sealing assembly includes a first screw base, a second clamping nut, a second pressure block, and a first sealing filler, all sleeved on the high-temperature thermocouple and the armored thermocouple. One end of the first screw base is fixed to the flange body. The second clamping nut is sleeved on the end of the first screw base away from the flange body and fixedly connected. The second pressure block is disposed inside the first screw base. One end of the second pressure block is fitted onto the second clamping nut, and the other end is filled with the first sealing filler.

[0010] Preferably, the second high-pressure sealing assembly includes a second screw base, a third clamping nut, a third pressure block, and a second sealing filler, all sleeved on the high-temperature thermocouple and the armored thermocouple. One end of the second screw base is fixedly connected to the end of the sealing cover away from the flange body. The third clamping nut is sleeved on and fixedly connected to the end of the second screw base away from the sealing cover. The third pressure block is disposed inside the second screw base, with one end of the third pressure block fitting against the third clamping nut and the other end filled with the second sealing filler.

[0011] Preferably, the temperature measuring point of the armored thermocouple has an insulated structure.

[0012] Preferably, the high-temperature thermocouple is of type S, R or B, and the armored thermocouple is of type K, E or N.

[0013] The beneficial effects of this utility model are:

[0014] 1. Novel structure, suitable for installation in various gasifiers, such as aerospace furnaces, Tsinghua furnaces, Jinhua furnaces, etc. for temperature measurement. Multiple sensors can be installed with the equipment first, and then the flange assembly and related seals can be assembled. The sensor multi-seal structure can enhance the sealing performance.

[0015] 2. A sealing protective cover structure is added to the lower part of the flange body. The sealing protective cover is inserted into the equipment until it is inside the furnace wall. This effectively prevents the medium from condensing and forming corrosive liquid that could corrode and damage the armored core. In the event of failure of the first or second high-pressure sealing assembly, it can effectively prevent the medium from entering the atmosphere, providing valuable time for handling leaks.

[0016] 3. It features adjustable insertion depth, making installation convenient and reliable. Individual sensors can be replaced, greatly reducing thermocouple maintenance costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0019] Figure 2 This is an embodiment of the present utility model. Figure 1 Enlarged cross-sectional view at point A;

[0020] Figure 3 This is an embodiment of the present utility model. Figure 1 Enlarged cross-sectional view at point B;

[0021] Figure 4 This is an embodiment of the present utility model. Figure 1 Enlarged cross-sectional view at point C.

[0022] The diagram is marked as follows:

[0023] 1. Junction box; 2. Secondary sealing assembly; 3. First high-pressure sealing assembly; 4. Flange assembly; 5. Second high-pressure sealing assembly; 6. High-temperature thermocouple; 7. Armored thermocouple; 8. Thermometer sleeve; 9. Inlet screw; 10. Sealing screw; 11. First clamping nut; 12. Sealing cover; 13. Clamping screw; 14. First clamping block; 15. PTFE packing; 16. Sealing cavity interface; 17. Flange body; 18. Sealing protective cover; 19. Copper gasket; 20. First screw base; 21. Second clamping nut; 22. Second clamping block; 23. First sealing packing; 24. Second screw base; 25. Third clamping nut; 26. Third clamping block; 27. Second sealing packing. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0025] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0026] like Figures 1 to 4As shown, a thermocouple for multi-point temperature measurement in a gasifier includes a junction box 1, a secondary sealing assembly 2, a first high-pressure sealing assembly 3, a flange assembly 4, a second high-pressure sealing assembly 5, a high-temperature thermocouple 6, an armored thermocouple 7, and a thermometer sheath 8. One end of the secondary sealing assembly 2 is fixedly connected to the junction box 1, and the other end is fixedly connected to the flange assembly 4. The first high-pressure sealing assembly 3 is disposed inside the secondary sealing assembly 2. One end of the second high-pressure sealing assembly 5 is fixedly connected to the end of the flange assembly 4 away from the secondary sealing assembly 2. One end of the high-temperature thermocouple 6 and the armored thermocouple 7 are sequentially inserted into the second high-pressure sealing assembly 5, the flange assembly 4, and the first high-pressure sealing assembly 3 to form a whole. The other end of the high-temperature thermocouple 6 is connected to one end of the thermometer sheath 8. The other end of the thermometer sheath 8 is tightly fixed to the equipment installation port. A leak-proof structure is provided at the connection between the thermometer sheath 8 and the high-temperature thermocouple 6. The cold junction leads inside the high-temperature thermocouple 6 and the armored thermocouple 7 pass through the secondary sealing assembly 2 and are connected to the terminals inside the junction box 1.

[0027] As an optional embodiment, the secondary sealing assembly 2 includes an inlet screw 9, a sealing screw 10, a first clamping nut 11, a sealing cover 12, a clamping screw 13, a first pressure block 14, and PTFE filler 15, all fitted onto the cold end lead wire. One end of the inlet screw 9 is fixed to one end of the junction box 1, and the other end is fitted onto the sealing screw 10 and fixedly connected. The free end of the sealing screw 10 is fixedly connected to the first clamping nut 11. The first clamping nut 11 is located at one end of the sealing cover 12, which is fitted onto the flange assembly 4 and fixedly connected. One end of the clamping screw 13 is located inside the inlet screw 9, and the other end is inserted into the sealing screw 10. One end of the first pressure block 14 is fitted onto the clamping screw 13, and the other end is filled with PTFE filler 15. A sealing cavity interface 16 is provided on the outer wall of the sealing cover 12.

[0028] like Figure 1 and Figure 2 As shown, the PTFE filler 15 is deformed by the compression screw 13 and the first pressure block 14 within the cavity of the sealing screw 10, thereby forming a sealing structure on the outside of the cold end leads of the high-temperature thermocouple 6 and the armored thermocouple 7.

[0029] As an optional embodiment, the flange assembly 4 includes a flange body 17 and a sealing cover 18. One end of the flange body 17 is disposed inside the sealing cover 12 and fixedly connected, and the other end is fixedly connected to one end of the sealing cover 18. A copper gasket 19 is provided between the flange body 17 and the sealing cover 12.

[0030] like Figure 1 and Figure 4 As shown, the sealing protective cover 18 is used to insert into the equipment. The length of the sealing protective cover 18 is located at the opening of the furnace wall of the equipment. The temperature at this position is usually lower than other positions, and condensation is likely to occur. The medium gas and water vapor condense and liquefy, and mix to form a corrosive liquid. In the prior art, when there is only an armor structure, the armor structure will usually corrode and break after a period of time. Adding the sealing protective cover 18 can effectively prevent the armor structure from being damaged by corrosion. Furthermore, a second high-pressure sealing component 5 is set at the front end of the sealing protective cover 18 to enhance the sealing effect.

[0031] As an optional embodiment, the first high-pressure sealing assembly 3 includes a first screw base 20, a second clamping nut 21, a second pressure block 22, and a first sealing filler 23, which are sleeved on the high-temperature thermocouple 6 and the armored thermocouple 7. One end of the first screw base 20 is fixed to the flange body 17. The second clamping nut 21 is sleeved on the end of the first screw base 20 away from the flange body 17 and fixedly connected. The second pressure block 22 is disposed inside the first screw base 20. One end of the second pressure block 22 is attached to the second clamping nut 21, and the other end is filled with the first sealing filler 23.

[0032] like Figure 1 and Figure 3 As shown, the first sealing filler 23 is squeezed by the second clamping nut 21 and the second pressure block 22 within the cavity on the first threaded base to form a seal on the outside of the high-temperature thermocouple 6 and the armored thermocouple 7.

[0033] As an optional embodiment, the second high-pressure sealing assembly 5 includes a second screw base 24, a third clamping nut 25, a third pressure block 26, and a second sealing filler 27, all sleeved on the high-temperature thermocouple 6 and the armored thermocouple 7. One end of the second screw base 24 is fixedly connected to the end of the sealing cover 18 away from the flange body 17. The third clamping nut 25 is sleeved on and fixedly connected to the end of the second screw base 24 away from the sealing cover 18. The third pressure block 26 is disposed inside the second screw base 24. One end of the third pressure block 26 is fitted onto the third clamping nut 25, and the other end is filled with the second sealing filler 27.

[0034] like Figure 1 and Figure 4 As shown, the second sealing packing 27 is squeezed by the third clamping nut 25 and the third pressure block 26 within the cavity on the second threaded base to form a seal on the outside of the high-temperature thermocouple 6 and the armored thermocouple 7.

[0035] As an optional embodiment, the temperature measuring point of the armored thermocouple 7 is an insulated structure.

[0036] As an optional embodiment, the high-temperature thermocouple 6 is of type S, R or B, and the armored thermocouple 7 is of type K, E or N.

[0037] The working principle is as follows: By installing a sealing protective cover 18 at the lower part of the flange body 17, and inserting the sealing protective cover 18 into the equipment until it is inside the furnace wall, it effectively prevents the condensation of the medium and the formation of corrosive liquid that could corrode and damage the armored core. A first high-pressure sealing assembly 3 and a second high-pressure sealing assembly 5 are respectively installed on the flange body 17 and the sealing protective cover 18 to improve the sealing effect of the high-temperature thermocouple 6 and the armored thermocouple 7. In the event of failure, the first high-pressure sealing assembly 3 or the second high-pressure sealing assembly 5 can effectively prevent the medium from entering the atmospheric environment. A sealing cavity interface 16 can be installed with... Pressure gauges or sensors for monitoring leaks provide valuable time for handling leak events. With a novel structure, they are suitable for installation in various gasifier models, such as aerospace furnaces, Tsinghua furnaces, and Jinhua furnaces, for temperature measurement. Multiple sensors can be installed with the equipment first, followed by assembly of flange components and related seals. The sensor employs a multi-seal structure to enhance sealing performance. It features adjustable insertion depth, convenient and reliable installation, and allows for individual sensor replacement, significantly reducing thermocouple maintenance costs. It effectively solves the problem of undetected leaks in furnace chambers, water-cooled walls, and annular cavities.

[0038] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this utility model is limited to these examples; within the framework of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of this utility model as described above, which are not provided in the details for the sake of brevity. Any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A thermocouple for multi-point temperature measurement in a gasifier, comprising a junction box (1), a secondary sealing assembly (2), a first high-pressure sealing assembly (3), a flange assembly (4), a second high-pressure sealing assembly (5), a high-temperature thermocouple (6), an armored thermocouple (7), and a thermometer sheath (8), characterized in that, One end of the secondary sealing assembly (2) is fixedly connected to the junction box (1), and the other end is fixedly connected to the flange assembly (4). The first high-pressure sealing assembly (3) is located inside the secondary sealing assembly (2). One end of the second high-pressure sealing assembly (5) is fixedly connected to the end of the flange assembly (4) away from the secondary sealing assembly (2). One end of the high-temperature thermocouple (6) and the armored thermocouple (7) are sequentially inserted into the second high-pressure sealing assembly (5), the flange assembly (4), and the first high-pressure sealing assembly (3) and connected as a whole. The other end of the high-temperature thermocouple (6) is connected to one end of the thermometer sleeve (8). The other end of the thermometer sleeve (8) is tightly fixed to the equipment installation port. A leak-proof structure is provided at the connection between the thermometer sleeve (8) and the high-temperature thermocouple (6). The cold junction leads inside the high-temperature thermocouple (6) and the armored thermocouple (7) pass through the secondary sealing assembly (2) and are connected to the terminals inside the junction box (1).

2. The thermocouple for multi-point temperature measurement in a gasifier according to claim 1, characterized in that, The secondary sealing assembly (2) includes an inlet screw (9) fitted onto the cold end lead wire, a sealing screw (10), a first clamping nut (11), a sealing cover (12), a clamping screw (13), a first pressure block (14), and PTFE filler (15). One end of the inlet screw (9) is fixed to one end of the junction box (1), and the other end is fitted onto the sealing screw (10) and fixedly connected. The free end of the sealing screw (10) is fixedly connected to the first clamping nut (11). A tightening nut (11) is provided at one end of the sealing cover (12), the sealing cover (12) is sleeved on the flange assembly (4) and fixedly connected, one end of the clamping screw (13) is provided inside the inlet screw (9), and the other end is inserted inside the sealing screw (10), one end of the first pressure block (14) is attached to the clamping screw (13), and the other end is filled with PTFE filler (15), and a sealing cavity interface (16) is provided on the outer wall of the sealing cover (12).

3. A thermocouple for multi-point temperature measurement in a gasifier according to claim 2, characterized in that, The flange assembly (4) includes a flange body (17) and a sealing cover (18). One end of the flange body (17) is disposed inside the sealing cover (12) and fixedly connected, and the other end is fixedly connected to one end of the sealing cover (18). A copper gasket (19) is provided between the flange body (17) and the sealing cover (12).

4. A thermocouple for multi-point temperature measurement in a gasifier according to claim 3, characterized in that, The first high-pressure sealing assembly (3) includes a first screw base (20), a second clamping nut (21), a second pressure block (22), and a first sealing filler (23) sleeved on the high-temperature thermocouple (6) and the armored thermocouple (7). One end of the first screw base (20) is fixed on the flange body (17). The second clamping nut (21) is sleeved on the end of the first screw base (20) away from the flange body (17) and fixedly connected. The second pressure block (22) is disposed inside the first screw base (20). One end of the second pressure block (22) is attached to the second clamping nut (21), and the other end is filled with the first sealing filler (23).

5. A thermocouple for multi-point temperature measurement in a gasifier according to claim 3, characterized in that, The second high-pressure sealing assembly (5) includes a second screw base (24), a third clamping nut (25), a third pressure block (26), and a second sealing filler (27) sleeved on the high-temperature thermocouple (6) and the armored thermocouple (7). One end of the second screw base (24) is fixedly connected to the end of the sealing cover (18) away from the flange body (17). The third clamping nut (25) is sleeved on the end of the second screw base (24) away from the sealing cover (18) and fixedly connected. The third pressure block (26) is disposed inside the second screw base (24). One end of the third pressure block (26) is attached to the third clamping nut (25), and the other end is filled with the second sealing filler (27).

6. A thermocouple for multi-point temperature measurement in a gasifier according to claim 1, characterized in that, The temperature measuring point of the armored thermocouple (7) is an insulated structure.

7. A thermocouple for multi-point temperature measurement in a gasifier according to claim 1, characterized in that, The high-temperature thermocouple (6) is of type S, R or B, and the armored thermocouple (7) is of type K, E or N.

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