Flange special for corrosion-resistant thermocouple

Abstract

The utility model relates to a special flange for a corrosion-resistant thermocouple, which comprises a flange, the flange is provided with a plurality of mounting holes, the upper parts of the mounting holes are provided with internal threads and reducing joints used for being connected with corresponding external threads, and the other ends of the reducing joints are provided with internal threads and clamping sleeve joints I used for being connected with corresponding external threads. The center of the reducing joint and the center of the first ferrule joint are both provided with through holes communicated with the mounting hole for a thermocouple to penetrate through, the lower portion of the mounting hole is also provided with internal threads used for being connected with a protection tube with corresponding external threads, and the other end of the protection tube is provided with internal threads used for being connected with a second ferrule joint with corresponding external threads. Through holes communicated with the mounting hole are formed in the central positions of the protection tube and the cutting sleeve joint II; and the protection tube and the cutting sleeve joint II surround the outer part of the thermocouple penetrating through the flange. The flange provides an external protection layer for the thermocouple, so that the thermocouple can be protected from chemical corrosion and mechanical damage, and the service life of the thermocouple is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of temperature measuring equipment for gasifiers, in particular to a special flange for corrosion-resistant thermocouples. Background Art

[0002] Shell coal gasification technology has the characteristics of wide adaptability to coal types, high carbon conversion rate, high effective gas (CO+H2) content in coal gas, low oxygen consumption, large single furnace production, high thermal efficiency, low environmental pollution, and long gasification furnace operation cycle. It is one of the mainstream technologies currently selected by domestic coal chemical projects. Shell gasifier is the focus and difficulty of this technology. Shell gasifier adopts a unique inner and outer double-layer structure. The outer shell is a pressure vessel, and the inner part is a membrane water-cooled wall structure. There is a large annular space between the inside and outside. This structure enables the gasifier to withstand high temperature (1500-1600℃) and high pressure (2.5-8.5Mpa) working environment. From the operation of Shell gasifier, if the temperature in the gasifier is too high, the heat exchange will generate more steam. If it exceeds the ash melting point, the inner wall of the gasifier will not be able to hang slag and burn the inner wall of the gasifier; if the temperature is too low, the coal powder will not be able to react completely, and most of the coal powder will enter the slag discharge system, causing the slag discharge system to fail to operate normally or even block slag. Therefore, it is necessary to measure the temperature inside the gasifier in real time. However, due to the high reaction temperature in the furnace, about 1500°C or more, there is no measuring element that can directly measure the temperature inside the furnace. Generally, thermocouples are used to measure the annular gap temperature of the Shell gasifier to provide data for the normal operation of the gasifier.

[0003] Our company currently uses multiple thermocouples to share a flange and install them on the gasifier to measure the annular gap temperature. The specific structure and installation method are as follows: Figure 5 Figure 6 As shown, a plurality of mounting holes 301 are provided on the flange 3 for mounting multiple thermocouples. The upper portion of the mounting hole 301 is provided with an internal thread for connecting a reducer 2 with a corresponding external thread. The other end of the reducer 2 is provided with an internal thread for connecting a ferrule joint 1 with an external thread. The center positions of the reducer 2 and the ferrule joint 1 are provided with through holes connected to the mounting hole 301. When in use, the thermocouple 6 passes through the ferrule joint 1, the reducer 2, and the mounting hole 301 in sequence, so that it extends to the position to be measured, and then the reducer 2 is threadedly connected to the mounting hole 301, and then the ferrule joint 1 is threadedly connected to the reducer 2, so that the thermocouple is sealed and fixed on the flange 3, and then the flange 3 is bolted to the connecting short pipe 9 of the gasifier 8.

[0004] During the temperature measurement process of this series of thermocouples, the corrosive gas in the annular space 10 will flow into the connecting short tube 9. The connecting short tube 9 has a narrow space and poor gas flowability, which leads to an increase in the concentration of corrosive gas. This can easily cause corrosion to the thermocouple 6 that passes through the flange 3 and enters the connecting short tube 9. The existing thermocouple 6 has only a thinner sleeve 601 on the outside, which is often corroded and damaged, and further corrodes and damages the internal hot electrode 602, affecting the real-time detection of the gasifier temperature. The shortened service life of the thermocouple also increases the production cost. Utility Model Content

[0005] In view of the above problems, the utility model aims to provide a corrosion-resistant thermocouple flange, which is used to solve the problem of corrosion damage to the thermocouple protection sleeve.

[0006] The specific technical scheme of the utility model is: a corrosion-resistant flange dedicated to thermocouples, comprising a flange, a plurality of mounting holes being opened on the flange, an internal thread being arranged on the upper portion of the mounting hole for connecting a reducer with a corresponding external thread, an internal thread being arranged on the other end of the reducer for connecting a ferrule joint with a corresponding external thread, a through hole being arranged at the center position of the reducer and the ferrule joint for passing the thermocouple, an internal thread being arranged at the lower portion of the mounting hole for connecting a protective tube with a corresponding external thread, an internal thread being arranged at the other end of the protective tube for connecting a ferrule joint with a corresponding external thread, a through hole being arranged at the center position of the protective tube and the ferrule joint for surrounding the outside of the thermocouple passing through the flange.

[0007] Furthermore, preferably, graphite gaskets are provided at the threaded connection between the lower portion of the mounting hole and the protective tube and at the threaded connection between the protective tube and the ferrule joint.

[0008] Further, preferably, the inner diameter of the through hole of the reducer, the first ferrule connector, and the second ferrule connector is equal to the outer diameter of the thermocouple.

[0009] Further, preferably, the inner diameters of the mounting hole and the through hole of the protection tube are greater than or equal to the outer diameter of the thermocouple.

[0010] Furthermore, preferably, the sheath of the thermocouple is a stainless steel tube with an outer diameter of 6 mm and a wall thickness of 1 mm.

[0011] Furthermore, preferably, the protection tube is a stainless steel tube with an outer diameter of 18 mm and a wall thickness of 5 mm.

[0012] The beneficial effects of the utility model are as follows: the corrosion-resistant thermocouple special flange is provided with a high temperature resistant and corrosion resistant protection tube and a ferrule joint, and the sealing of the protection tube is achieved through the ferrule joints at both ends, so that a protective layer is formed on the outside of the thermocouple, which can prevent the thermocouple passing through the flange and entering the connecting short pipe part from chemical corrosion, fundamentally solve the corrosion damage problem of this part, and extend the service life of the thermocouple. Moreover, the special flange is composed of multiple detachable parts, which can be flexibly replaced according to the damage of each part during use, and the replacement is convenient and quick, and the replacement cost of a single part is low, which is conducive to reducing the consumption cost of spare parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a working cross-sectional view of a corrosion-resistant thermocouple special flange according to an embodiment of the present invention;

[0014] Figure 2 It is an exploded cross-sectional view of a corrosion-resistant thermocouple flange according to an embodiment of the present invention;

[0015] Figure 3 A top view of a corrosion-resistant thermocouple flange according to an embodiment of the present invention;

[0016] Figure 4 This is a schematic diagram of the installation of a corrosion-resistant thermocouple flange according to an embodiment of the present invention;

[0017] Figure 5 It is a working cross-sectional view of an existing thermocouple special flange;

[0018] Figure 6 It is an exploded sectional view of the existing thermocouple special flange;

[0019] In the figure: 1-card ferrule joint 1, 2-reducing joint, 3-flange, 301-mounting hole, 4-protection tube, 5-card ferrule joint 2, 6-thermocouple, 601-sleeve, 602-thermal electrode, 7-graphite gasket, 8-gasifier, 9-connecting short pipe. DETAILED DESCRIPTION

[0020] In order to make the technical problems and technical solutions solved by the utility model more clearly understood, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0021] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0022] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", and "connect" 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 the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] like Figures 1 to 4 As shown, this embodiment provides a corrosion-resistant thermocouple-specific flange, including a flange 3, a plurality of mounting holes 301 are opened on the flange 3, an internal thread is arranged on the upper portion of the mounting hole 301, and is used to connect a reducer 2 with a corresponding external thread, and the other end of the reducer 2 is provided with an internal thread, and is used to connect a ferrule joint 1 with a corresponding external thread, and the center positions of the reducer 2 and the ferrule joint 1 are both provided with a through hole connected to the mounting hole 301 for the thermocouple 6 to pass through, and the above is the prior art.

[0024] The present application adds a protective tube to the part where the thermocouple penetrates the flange and enters the connecting short pipe to protect the thermocouple from chemical corrosion and mechanical damage. The specific structure is: the lower part of the mounting hole 301 is also provided with an internal thread for connecting the protective tube 4 with the corresponding external thread, the other end of the protective tube 4 is provided with an internal thread for connecting the ferrule joint 2 5 with the corresponding external thread, the central position of the protective tube 4 and the ferrule joint 2 5 are provided with a through hole connected to the mounting hole, the protective tube 4 and the ferrule joint 2 5 surround the outside of the thermocouple 6 passing through the flange 3, wherein the length of the protective tube 4 can be set according to the length of the thermocouple 6 passing through the flange and entering the connecting short pipe 9, and the principle is that the protective tube 4 can surround the section of the thermocouple 6 after being connected to the ferrule joint 2 5.

[0025] The specific processing dimensions are as follows:

[0026] Flange: ANSI 600LB DN100 RF, forged, made of 14Cr1Mo, clad with 5mm thick 316L stainless steel;

[0027] Mounting hole: Figure 3As shown, 4 can be set up to install 4 thermocouples, with a hole diameter of Φ10mm, and the upper and lower parts are expanded to open NPT3 / 8" internal thread structure, and the internal thread size is M16×1.5×16mm (i.e. 16mm thread hole outer diameter, 1.5mm thread pitch, 16 thread length);

[0028] Reducing joint: external thread size is M16×1.5mm, internal thread size is M12×1.5×22mm, through hole is Φ6mm;

[0029] Ferrule connector 1: External thread size is M12×1.5 to Φ6mm;

[0030] Thermocouple: The existing thermocouple sleeve is Φ5×0.8mm (i.e., the diameter is 5mm and the wall thickness is 0.8mm). In order to enhance the protection of the sleeve, the thermocouple sleeve is designed as a Φ6×1mm 316L stainless steel tube;

[0031] Protection tube: As a key component for the protection of thermocouples, it adopts Φ18*5mm 316L stainless steel tube, which has good high temperature resistance and corrosion resistance, better protection effect, and high thermal conductivity to ensure accurate temperature measurement; the external thread is processed into NPT3 / 8” external thread structure, and the internal thread size is M12×1.5;

[0032] Compression fitting 2: Made of 316L stainless steel, external thread size is M12×1.5 to Φ6mm.

[0033] Working principle: First, install the reducer 2 and the protective tube 4 on the mounting hole 301 of the flange 3, and the thermocouple 6 passes through the ferrule 1, the reducer 2, the mounting hole 301, the protective tube 4, and the ferrule 2 5 in sequence, while ensuring that the thermocouple 6 passes through the flange 3 to the measuring position (such as Figure 4 The measuring points in the test are ①, ②, ③, and ④), and then the ferrule joint 2 5 is fastened to the protection tube 4 to complete the seal; secondly, the ferrule joint 1 and the protection tube 4 are purged with instrument air to reduce the internal corrosive gas, and then the ferrule joint 1 is fastened to the reducer 2 to complete the sealing of the entire protection tube. Finally, the flange 3 is installed on the connecting short pipe 9 of the gasifier 8 with bolts to measure the annular gap temperature of the gasifier.

[0034] Preferably, in order to ensure air tightness, graphite gaskets 7 are installed at the threaded connection between the lower part of the mounting hole 301 and the protective tube 4 and at the internal threaded connection between the protective tube 4 and the ferrule joint 5. The graphite gasket 7 is a metal-wound graphite gasket with good sealing performance, high temperature resistance, corrosion resistance, high resilience, high strength and the like. It can be used stably for a long time under harsh working conditions and rarely requires maintenance.

[0035] Preferably, the inner diameter of the through hole of the reducer 2, the ferrule connector 1, and the ferrule connector 2 5 is equal to the outer diameter of the thermocouple 6, which is conducive to the installation and fixation of the thermocouple.

[0036] Preferably, the inner diameters of the mounting hole 301 and the through hole of the protection tube 4 are greater than or equal to the outer diameter of the thermocouple 6 to facilitate the passage of the thermocouple.

[0037] The above-mentioned corrosion-resistant thermocouple special flange is provided with a high-temperature resistant and corrosion-resistant protective tube and a ferrule joint, and the sealing of the protective tube is achieved through the ferrule joints at both ends, so that a protective layer is formed on the outside of the thermocouple, which can prevent the thermocouple from direct contact with corrosive gases, protect the thermocouple from chemical corrosion and mechanical damage, and greatly improve the service life of the thermocouple.

[0038] The application of this special flange to measure the annular gap temperature of the gasifier can increase the service life of the thermocouple from the original 12 to 18 months to seven to eight years. The gasifier uses 12 sets of multiple thermocouples of this type at a time. Calculated at a price of 15,000 yuan per set, within the eight-year service life, it can save 1.26 million yuan in thermocouple consumption costs and reduce the frequency of maintenance, creating conditions for the continuous operation of the gasifier.

[0039] In addition, the corrosion-resistant thermocouple flange consists of multiple detachable parts, which can be flexibly replaced according to the damage of each part during use. The replacement is convenient and quick, and the replacement cost of a single part is low, which is conducive to reducing the consumption cost of spare parts.

[0040] The present invention is described in detail above through specific and preferred embodiments, but those skilled in the art should understand that the present invention is not limited to the embodiments described above, and any modifications, equivalent substitutions, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A corrosion-resistant thermocouple flange, comprising a flange (3), a plurality of mounting holes (301) being formed on the flange (3), an internal thread being formed on the upper portion of the mounting holes (301) for connecting a reducer (2) having a corresponding external thread, an internal thread being formed on the other end of the reducer (2) for connecting a ferrule joint (1) having a corresponding external thread, a through hole being formed at the center of the reducer (2) and the ferrule joint (1) for passing a thermocouple (6), characterized in that: The lower portion of the mounting hole (301) is also provided with an internal thread for connecting a protection tube (4) having a corresponding external thread. The other end of the protection tube (4) is provided with an internal thread for connecting a second ferrule joint (5) having a corresponding external thread. The center positions of the protection tube (4) and the second ferrule joint (5) are both provided with a through hole connected to the mounting hole. The protection tube (4) and the second ferrule joint (5) surround the outside of the thermocouple (6) passing through the flange (3).

2. The corrosion-resistant thermocouple flange according to claim 1, characterized in that: Graphite gaskets (7) are provided at the threaded connection between the lower part of the mounting hole (301) and the protection tube (4), and at the threaded connection between the protection tube (4) and the second ferrule joint (5).

3. The corrosion-resistant thermocouple flange according to claim 1, characterized in that: The inner diameters of the through holes of the reducing joint (2), the first ferrule joint (1), and the second ferrule joint (5) are equal to the outer diameter of the thermocouple (6).

4. The corrosion-resistant thermocouple flange according to claim 1, characterized in that: The inner diameters of the mounting hole (301) and the through hole of the protection tube (4) are greater than or equal to the outer diameter of the thermocouple (6).

5. A corrosion-resistant thermocouple flange according to claim 3 or 4, characterized in that: The sleeve (601) of the thermocouple (6) is a stainless steel tube with an outer diameter of 6 mm and a wall thickness of 1 mm.

6. The corrosion-resistant thermocouple flange according to claim 4, characterized in that: The protective tube (4) is a stainless steel tube with an outer diameter of 18 mm and a wall thickness of 5 mm.

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