Temperature thermocouple for brick supporting plate of gasification furnace

Abstract

The utility model discloses a temperature thermocouple for a brick supporting plate of a gasification furnace. The temperature thermocouple comprises a sheathed thermocouple, a sensor patch, a high-pressure sealing assembly, a secondary sealing assembly, a flange assembly, a guide pipe, a red copper gasket and a junction box, the guide pipe is welded with the surface of the brick supporting plate, the sheathed thermocouple and the sensor patch are welded and then reversely and sequentially penetrate through the flange assembly and the high-pressure sealing assembly to be connected into a whole, and the sheathed thermocouple and the sensor patch penetrate through a flange hole of the flange assembly and penetrate into the guide pipe. A temperature measuring point is protected from being influenced by a medium in the equipment; the temperature measurement precision and the response time of the thermocouple are effectively improved; the thermocouple has the performance of adjustable insertion depth, can ensure the safety of temperature measurement, and greatly reduces the maintenance cost of the thermocouple.

Description

Technical Field

[0001] The utility model relates to a thermocouple for monitoring the temperature of the outer side (quenching chamber side) of the plate surface of the refractory bricks at the bottom of a gasifier, in particular to a thermocouple for measuring the temperature of a gasifier brick support plate. Background Art

[0002] The gasifier is an indispensable equipment for fertilizer production. The normal and safe operation of the gasifier is related to the safety and benefits of the fertilizer plant. When the gasifier is operating normally, the temperature inside the furnace exceeds 1200℃, the pressure is greater than 5Mpa, and the process medium is synthesis gas (including H2, CO, CO2, H2S, solid particles, etc.). The gasifier is equipped with a brick support plate, which is located between the combustion chamber and the quenching chamber of the gasifier, and directly above it is the cone bottom brick of the gasifier. The temperature of the combustion chamber exceeds 1200℃, and the temperature of the quenching chamber is 200-500℃, with a large temperature difference between the upper and lower parts. When the cone bottom bricks of the gasifier become thinner or fall off, the temperature of the brick support plate will rise, so it is particularly important to monitor the temperature of the brick support plate, which can be used to determine whether the cone bottom bricks are normal during production operation. During the installation process, the measuring end of the thermocouple needs to be placed close to the surface of the brick support plate for temperature measurement. At present, the existing brick support plate thermocouples are often inserted too deep or too short after installation, and cannot achieve a tight fit. The thermocouple can only be removed and the position of the sensor and the bending of the measuring end can be readjusted. This repeated disassembly and bending process may cause damage to the thermocouple sensor and failure, affecting the subsequent use of the thermocouple. Often, new thermocouples can only be replaced or the thermocouples with loose fits are forced to continue to be used, resulting in the thermal response speed and temperature measurement accuracy of the subsequent temperature measurement points cannot be fast and unified, and cannot meet the design and process requirements. Therefore, how to achieve a close fit between the thermocouple and the surface of the brick support plate determines the accuracy and rapid response performance of the sensor. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a thermocouple for measuring the temperature of a gasification furnace supporting brick plate in view of the deficiencies of the prior art.

[0004] In order to achieve the above purpose, the measures taken by the utility model are:

[0005] A temperature measuring thermocouple for the brick supporting plate of a gasifier, comprising a sheathed thermocouple, a sensor patch, a high-pressure sealing assembly, a secondary sealing assembly, a flange assembly, a guide tube, a copper gasket and a junction box. The high-pressure sealing assembly consists of a screw base, a graphite packing, a first pressing block and a pressing screw. The flange assembly consists of a flange base, a reinforcing pipe and a flange. The secondary sealing assembly consists of an extension pipe, a sealing screw, a packing, a second pressing block and a fastening nut. The guide tube is welded to the surface of the brick supporting plate. After the sheathed thermocouple is welded to the sensor patch, it passes through the flange assembly and the high-pressure sealing assembly in reverse order and is connected into one body. The sheathed thermocouple and the sensor patch pass through the flange hole of the flange assembly and into the guide tube. The angle of the sensor patch fits the surface of the brick supporting plate. The sheathed thermocouple is close to the surface of the brick supporting plate. The high-pressure sealing assembly is locked. The copper gasket is arranged between the flange base of the flange assembly and the extension pipe of the secondary sealing assembly. The cold-end lead of the sheathed thermocouple passes through the secondary sealing assembly and is connected to the terminal in the junction box. The packing in the secondary sealing assembly presses the cold-end lead to achieve secondary sealing;

[0006] The head end of the said guide tube is cut into an inclined plane shape, and the inclination of the inclined plane shape is consistent with the inclination of the inclined plane on the brick supporting plate. A chamfer is provided at the opening of the guide tube to facilitate the installation of the sensor and the sensor patch;

[0007] A hole is opened in the middle of the said sensor patch and is fixed by spot welding at an angle with the sheathed thermocouple. A space is reserved at the head for filling brazing filler, so that the temperature measuring end of the sheathed thermocouple and the sensor patch are melted into one body, and then polished to remove excess welding slag;

[0008] The flange base, the reinforcing pipe and the flange of the said flange assembly are integrally connected by a welding connection form;

[0009] The temperature measuring point of the said sheathed thermocouple is a structure of grounded and exposed junction type;

[0010] The sheathed thermocouple and the sensor patch are connected by a brazing welding structure. After the sheathed thermocouple and the sensor patch are fitted, they are fixed by spot welding. A space is reserved in the inner hole of the sensor patch for filling silver-copper brazing filler, so that the welding joint of the sheathed thermocouple and the silver-copper brazing filler are integrated;

[0011] The graduation number of the said sheathed thermocouple is type K, N, S or R;

[0012] The sealing structure of the said high-pressure sealing assembly is: in the cavity on the screw base, the graphite packing is deformed by extrusion through the first pressing block and the pressing screw to form a seal on the outside of the sheathed thermocouple. The screw base and the pressing screw are connected by threads. The graphite packing is pressed into the cavity on the screw base. The first pressing block is squeezed between the graphite packing and the pressing screw. The sheathed thermocouple passes through the high-pressure sealing assembly, and the high-pressure sealing assembly is arranged in the extension pipe;

[0013] The sealing structure of the secondary sealing assembly is as follows: in the cavity of the sealing screw, the filler made of plastic or rubber is deformed by the second pressing block and the fastening nut, forming a sealing structure for the outside of the cold-end lead of the armored thermocouple. The sealing screw and the fastening nut are threadedly connected. The filler and the second pressing block are arranged in the cavity of the sealing screw, and the cold-end lead passes through the secondary sealing assembly.

[0014] The center line of the armored thermocouple extends to the temperature measurement node provided on the sensor patch.

[0015] The beneficial effects of the present utility model are as follows: novel structure. 1. By presetting the guiding tube on the inclined surface of the brick support plate, the temperature measurement position of the thermocouple can be unified and standardized. At the same time, the temperature inside the guiding tube is more stable and not easily affected by external factors. The inclination treatment at the entrance of the guiding tube makes it easier for the thermocouple to penetrate. Through the support of the guiding tube, it can also effectively prevent the armored thermocouple from becoming soft and bent due to being in a high-temperature and high-pressure environment for a long time, resulting in wall attachment failure. 2. The armored thermocouple adopts a temperature measurement point leakage-end structure, and silver-copper brazing filler is filled and encapsulated in the patch. This structure that integrates the temperature measurement point with a metal material with high thermal conductivity can maximize the fast response performance of the thermocouple, and the brazing filler can also well protect the temperature measurement point from the influence of the medium inside the equipment. 3. The measurement end of the armored thermocouple is designed with a patch structure having the same angle as the inner surface of the equipment, increasing the fitting (heat conduction) area and effectively improving the temperature measurement accuracy and response time of the thermocouple. 4. After the armored thermocouple penetrates into the equipment, it first closely adheres to the inclined surface of the brick support plate, and then the armored thermocouple is locked by the high-pressure sealing assembly, having the performance of adjustable insertion depth, avoiding the situation that the measurement end cannot fit the surface of the measured equipment, resulting in a decrease in temperature measurement accuracy and a slow response time. 5. The armored thermocouple can ensure the safety of temperature measurement through the double-layer sealing measures of the high-pressure sealing assembly and the secondary sealing assembly. Moreover, all the sealing assemblies can be disassembled and reassembled, and except for the sealing filler, the rest can be reused, greatly reducing the maintenance cost of the thermocouple. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0017] Figure 2 For the present utility model Figure 1 The enlarged structural schematic diagram at position A.

[0018] Figure 3 For the present utility model Figure 1 The enlarged structural schematic diagram at position B.

[0019] Figure 4 For the present utility model Figure 1 The enlarged structural schematic diagram at position C.

[0020] Figure 5This is a schematic diagram of the application structure of the utility model. Detailed implementation manners

[0021] A temperature measuring thermocouple for the brick supporting plate of a gasifier includes an armored thermocouple 2, a sensor patch 1, a high-pressure sealing assembly, a secondary sealing assembly, a flange assembly, a guide tube 17, a copper gasket 6, and a junction box 16. The high-pressure sealing assembly consists of a screw base 7, a graphite packing 8, a first pressing block 9, and a pressing screw 10. The flange assembly consists of a flange base 5, a reinforcing pipe 3, and a flange 4. The reinforcing pipe 3 is sleeved inside the guide tube 17, and the guide tube 17 is connected to the flange assembly. The armored thermocouple 2 is sleeved inside the reinforcing pipe 3. The secondary sealing assembly consists of an extension tube 12, a sealing screw 11, a packing 13, a second pressing block 14, and a fastening nut 15. The guide tube 17 is welded to the surface of the brick supporting plate 100. After the armored thermocouple 2 and the sensor patch 1 are welded, they are sequentially passed through the flange assembly and the high-pressure sealing assembly in the reverse direction and connected into one body. The armored thermocouple 2 and the sensor patch 1 pass through the flange holes of the flange assembly and penetrate into the guide tube 17. The angle of the sensor patch 1 fits with the surface of the brick supporting plate 100. The armored thermocouple 2 is closely attached to the surface of the brick supporting plate 100. The high-pressure sealing assembly is locked. The copper gasket 6 is arranged between the flange base 5 of the flange assembly and the extension tube 12 of the secondary sealing assembly. The extension tube 12 and the flange base 5 are connected by threads. The extension tube 12 and the sealing screw 11 are connected by threads or welding. The cold-end lead 201 of the armored thermocouple 2 passes through the secondary sealing assembly and is connected to the terminal in the junction box 16. The packing 13 in the secondary sealing assembly presses the cold-end lead 201 to achieve secondary sealing.

[0022] The head end of the guide tube 17 is cut into an inclined surface shape 1701, and the inclination of the inclined surface shape 1701 is consistent with the inclination of the inclined surface on the brick supporting plate 100. A chamfer is provided at the opening of the guide tube 17 to facilitate the installation of the sensor and the sensor patch 1.

[0023] A middle hole of the sensor patch 1 is opened at an angle with the armored thermocouple 2 and fixed by spot welding. A space is reserved at the head for filling brazing filler 101, and then it is polished to make the temperature measuring end of the armored thermocouple 2 and the sensor patch 1 melt into one body.

[0024] The flange base 5, the reinforcing pipe 3, and the flange 4 of the flange assembly are integrally connected by a welding connection form.

[0025] The temperature measuring point structure of the armored thermocouple 2 is a shell leakage end type structure.

[0026] The armored thermocouple 2 and the sensor patch 1 are connected by a brazing welding structure. After the armored thermocouple 2 and the sensor patch 1 are matched, they are fixed by spot welding. A space is reserved in the inner hole of the sensor patch 1 for filling silver-copper brazing filler, so that the welding joint of the armored thermocouple 2 and the silver-copper brazing filler are integrated.

[0027] The graduation numbers of the armored thermocouple 2 are of type K, N, S or R.

[0028] The sealing structure of the high-pressure sealing assembly is as follows: in the cavity of the screw base 7, the graphite packing 8 is deformed by extrusion through the first pressing block 9 and the pressing screw 10 to form a seal on the outside of the armored thermocouple 2. The screw base 7 and the pressing screw 10 are connected by threads. The graphite packing 8 is pressed into the cavity of the screw base 7. The first pressing block 9 is squeezed between the graphite packing 8 and the pressing screw 10. The armored thermocouple 2 passes through the high-pressure sealing assembly, and the high-pressure sealing assembly is arranged in the extension tube 12.

[0029] The sealing structure of the secondary sealing assembly is as follows: in the cavity of the sealing screw 11, the packing 13 made of plastic or rubber is deformed by extrusion through the second pressing block 14 and the fastening nut 15 to form a sealing structure on the outside of the cold-end lead 201 of the armored thermocouple 2. The sealing screw 11 and the fastening nut 15 are connected by threads. The packing 13 and the second pressing block 14 are arranged in the cavity of the sealing screw 11. The cold-end lead 201 passes through the secondary sealing assembly.

[0030] The center line of the armored thermocouple 2 extends to the temperature-measuring node 111 provided on the sensor patch 1.

[0031] The technical problem to be solved by the present utility model is to provide an adjustable temperature-measuring thermocouple with a simple structure, high pressure resistance, convenient disassembly and assembly, accurate temperature measurement, and good contact with the inner wall of the brick support plate, which can effectively improve the measurement accuracy and response time, and solve the problems of inability to accurately measure the surface temperature of the brick support plate, rapid response, and simultaneous high-pressure resistance.

[0032] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A thermocouple for measuring the temperature of a gasifier support brick plate, comprising an armored thermocouple (2), a sensor patch (1), a high-pressure sealing component, a secondary sealing component, a flange component, a guide tube (17), a copper gasket (6) and a junction box (16), characterized in that: The high-pressure sealing assembly is composed of a screw base (7), a graphite filler (8), a first pressure block (9) and a clamping screw (10); the flange assembly is composed of a flange base (5), a reinforcing tube (3) and a flange (4); the secondary sealing assembly is composed of an extension tube (12), a sealing screw (11), a filler (13), a second pressure block (14) and a fastening nut (15); the guide tube (17) is welded to the surface of the supporting brick plate (100); the armored thermocouple (2) and the sensor patch (1) are welded and then inserted into the flange assembly and the high-pressure sealing assembly in reverse order to form a whole; the armored thermocouple (2) and the sensor patch (1) pass through the flange hole of the flange assembly and penetrate into the guide tube (17), the angle of the sensor patch (1) fits with the surface of the brick support plate (100), the armored thermocouple (2) is in close contact with the surface of the brick support plate (100), the copper gasket (6) is arranged between the flange base (5) of the flange assembly and the extension tube (12) of the secondary sealing assembly, the cold end lead (201) of the armored thermocouple (2) passes through the secondary sealing assembly and is connected to the terminal in the junction box (16), and the filler (13) in the secondary sealing assembly presses the cold end lead (201).

2. A thermocouple for measuring temperature of a gasifier support brick plate according to claim 1, characterized in that: The head end of the guide tube (17) is cut into a sloped shape (1701), the inclination of the sloped shape (1701) is consistent with the inclination of the slope on the brick support plate (100), and the opening of the guide tube (17) is chamfered to facilitate the installation of the sensor and the sensor patch (1).

3. A thermocouple for measuring temperature of a gasifier support brick plate according to claim 1 or 2, characterized in that: The middle opening of the sensor patch (1) is fixed to the armored thermocouple (2) at an angle by spot welding, and a space is reserved at the head to be filled with a brazing filler (101).

4. A thermocouple for measuring temperature of a gasifier support brick plate according to claim 3, characterized in that: The flange base (5), the reinforcing pipe (3) and the flange (4) of the flange assembly are connected as one body through welding.

5. The thermocouple for measuring temperature of a gasifier support brick plate according to claim 4, characterized in that: The temperature measuring point of the armored thermocouple (2) is a shell-connected leakage end type structure.

6. A thermocouple for measuring temperature of a gasifier support brick plate according to claim 5, characterized in that: The armored thermocouple (2) and the sensor patch (1) are connected by a brazing welding structure. The armored thermocouple (2) and the sensor patch (1) are fixed by spot welding after being matched. A space is reserved in the inner hole of the sensor patch (1) for filling silver-copper brazing material, so that the welding node of the armored thermocouple (2) and the silver-copper brazing material are integrated.

7. A thermocouple for measuring temperature of a gasifier support brick plate according to claim 6, characterized in that: The armored thermocouple (2) has a graduation number of K, N, S or R type.

8. The thermocouple for measuring temperature of a gasifier support brick plate according to claim 7, characterized in that: The sealing structure of the high-pressure sealing assembly is as follows: in the cavity on the screw base (7), the first pressing block (9) and the clamping screw (10) squeeze the graphite filler (8) to deform to form a seal on the outside of the armored thermocouple (2); the screw base (7) and the clamping screw (10) are connected by threads, the graphite filler (8) is pressed into the cavity on the screw base (7), the first pressing block (9) is squeezed between the graphite filler (8) and the clamping screw (10), the armored thermocouple (2) passes through the high-pressure sealing assembly, and the high-pressure sealing assembly is arranged in the extension tube (12).

9. A thermocouple for measuring temperature of a gasifier support brick plate according to claim 8, characterized in that: The sealing structure of the secondary sealing component is as follows: a filler (13) made of plastic or rubber is deformed by squeezing the second pressing block (14) and the fastening nut (15) in the cavity of the sealing screw (11), thereby forming a sealing structure for the outside of the cold end lead (201) of the armored thermocouple (2); the sealing screw (11) and the fastening nut (15) are threadedly connected, the filler (13) and the second pressing block (14) are arranged in the cavity of the sealing screw (11), and the cold end lead (201) passes through the secondary sealing component.

10. A thermocouple for measuring temperature of a gasifier support brick plate according to claim 9, characterized in that: The center line of the armored thermocouple (2) extends to a temperature measurement node (111) provided on the sensor patch (1).

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