Sheath device of valve of low-temperature methanol washing equipment and low-temperature methanol washing equipment

Abstract

The utility model provides a protective sleeve device of a valve of low-temperature methanol washing equipment and the low-temperature methanol washing equipment, the protective sleeve device comprises a cylindrical protective sleeve which is used for being connected to the outer wall of a part of a valve rod of the valve in a clearance sleeving mode, and the protective sleeve is of a split type structure which is separated in the circumferential direction so as to comprise a plurality of branch sleeve bodies; the binding pieces are arranged on the outer walls of the sub-sleeve bodies to limit the sub-sleeve bodies to form the protective sleeve, the problem of icing of the valve rod can be effectively solved by arranging the protective sleeve, and then normal work of the valve is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical engineering, and particularly relates to a sheath device for a valve of a low-temperature methanol washing device and a low-temperature methanol washing device including the sheath device. Background Art

[0002] In the field of coal chemical industry, the low-temperature methanol washing process plays a crucial role. Whether it is the direct liquefaction of coal, indirect liquefaction, or the process units for producing chemical products by coal gasification, most of them require a gas purification process. The low-temperature methanol washing process is undoubtedly the most competitive and mature gas purification technology at present, and has been widely applied to gas purification devices such as synthetic ammonia, synthetic methanol and other carbonyl syntheses, town gas, industrial hydrogen production, and natural gas desulfurization at home and abroad.

[0003] In the low-temperature methanol washing process, the medium of some valve measurement pipelines is low-temperature methanol, and the temperature of the low-temperature methanol is relatively low, usually about -30°C - 50°C, or even lower. In spring, autumn, and winter, the valve stem of the valve in the low-temperature methanol process is extremely easy to freeze. After a long time, the valve will not be able to operate due to the increased torque required for the valve stem to freeze. For example, in a domestic low-temperature methanol washing device, the emergency cut-off valve XV-22252 from the second sulfur-free methanol ammonia cooler to the methanol flash tank, due to the too low temperature of the rich methanol medium in the pipeline where the valve is located (the process operating temperature is -33°C below zero), the water vapor in the air around the valve stem freezes onto the valve stem, often causing the valve to fail to operate due to icing, and maintenance personnel need to regularly remove the ice, which increases the safety of valve operation and also increases the on-site maintenance workload.

[0004] Therefore, it is necessary to design a sheath device for a valve of a low-temperature methanol washing device and a low-temperature methanol washing device to avoid or reduce the problem that the valve stem of the valve is prone to icing. Summary of the Utility Model

[0005] In view of some or all of the above technical problems existing in the prior art, the present utility model provides a sheath device for a valve of a low-temperature methanol washing device and a low-temperature methanol washing device including the same. The sheath device for a valve of the low-temperature methanol washing device can play a heat insulation role, avoid or reduce the freezing of water vapor in the surrounding air onto the valve stem, and thus avoid the problem that the valve cannot operate due to icing.

[0006] According to one aspect of the present utility model, there is provided a sheath device for a valve of a low-temperature methanol washing device, including a cylindrical sheath for being sleeved onto the outer wall of a part of the valve stem of the valve in an intermittent manner. The sheath is configured as a split type separated in the circumferential direction to include a plurality of split sleeve bodies, and a bundling member is provided on the outer wall of the split sleeve body to define the split sleeve body to form the sheath.

[0007] In one embodiment, an elastic seal is provided on at least one end face in the axial direction of the sheath, and at least one opening is provided in the circumferential direction of the elastic seal.

[0008] In one embodiment, the sheath is made of one of polytetrafluoroethylene and nylon materials.

[0009] In one embodiment, the thickness of the sheath is not less than 8 mm.

[0010] In one embodiment, the sheath includes at least three sub-sheath bodies, and the butt joint surface between adjacent sub-sheath bodies in the circumferential direction extends along the axial direction of the sheath.

[0011] In one embodiment, the adjacent sub-sheath bodies in the circumferential direction are in concave-convex mating contact.

[0012] In one embodiment, a plastic film is wound around the outer wall of the sheath, and the binding member is provided on the outer wall of the plastic film.

[0013] In one embodiment, the binding member is at least one of a pipe clamp and a cable tie.

[0014] According to another aspect of the present invention, there is provided a low-temperature methanol washing device, comprising:

[0015] A valve, the valve includes a valve body and a valve stem extending out of the valve body,

[0016] An actuator connected to the extending end of the valve stem,

[0017] A limiting seat provided between the actuator and the valve body, one end of the limiting seat is fixed to the actuator and the other end is fixed to the valve body, and the valve stem passes through the limiting seat,

[0018] The sheath device of the valve of the above-mentioned low-temperature methanol washing device, the sheath is arranged in the limiting seat and sleeved on the outer wall of the valve stem.

[0019] In one embodiment, the gap between the sheath and the valve stem is 0.1-0.2 mm.

[0020] Compared with the prior art, the advantages of the present invention are as follows: The sheath is sleeved on the valve stem with a gap, and the sheath plays a role in protecting and insulating the valve stem, which is used to avoid or reduce the freezing of water vapor in the surrounding air onto the valve stem, thereby effectively improving the problem that the valve cannot operate due to icing, reducing the need for maintenance personnel, and increasing the safety of valve operation. In addition, the sheath is constructed as a split type, making its installation relatively convenient and not affecting the structure of the valve itself and the installation operation, etc. At the same time, the split type can also ensure that the sheath can be easily disassembled, facilitating operations such as overhauling the valve stem. Brief Description of the Drawings

[0021] The preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. In the figures:

[0022] Figure 1 Shows an exploded view of the sheath of the sheath device of the valve of the low-temperature methanol washing equipment according to an embodiment of the present utility model;

[0023] Figure 2 Shows an overall view of the sheath of the sheath device of the valve of the low-temperature methanol washing equipment according to an embodiment of the present utility model;

[0024] Figure 3 Shows the application of the sheath device of the valve of the low-temperature methanol washing equipment according to an embodiment of the present utility model;

[0025] Figure 4 Is the enlarged view at A from Figure 3 ;

[0026] Figure 5 Is the cross-sectional view taken along line B-B from Figure 3 .

[0027] In the drawings, the same components are denoted by the same reference numerals. The drawings are not drawn to actual scale. Detailed Description of the Embodiments

[0028] In order to make the technical solutions and advantages of the present utility model clearer and more understandable, the exemplary embodiments of the present utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than an exhaustive list of all embodiments. And without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0029] The embodiments of the present utility model propose a sheath device for a valve of a low-temperature methanol washing equipment. As Figures 1 to 5As shown, the sheath device of the valve of the low-temperature methanol washing equipment includes a sheath 1 and a binding member 2. Among them, the sheath 1 itself is in a sleeve shape. During use, the sheath 1 is used to be sleeved on the outer wall of the exposed part of the valve stem 31 of the valve 3 to protect and insulate the valve stem 31, so as to avoid or reduce the freezing of water vapor in the surrounding air onto the valve stem 31, thereby effectively improving the problem that the valve 3 cannot operate due to icing, thus reducing the demand for maintenance personnel and increasing the safety of valve operation. In addition, in this application, the sheath 1 is configured as a split type and includes a plurality of split sleeve bodies 11 to separate the sheath 1 in the circumferential direction, so that the sheath 1 can be easily sleeved on the valve stem 31 and removed from the valve stem 31 without affecting the structure of the valve stem 31 itself. For example, during installation, the split sleeve bodies 11 can be combined at the outer wall of the valve stem 31 to form the sheath 1 sleeving the valve stem 31. During disassembly, only by releasing the connection between the split sleeve bodies 11, the split sleeve bodies 11 can be removed from the valve stem 31 without disassembling other components such as the valve stem 31. The binding member 2 is arranged on the outer wall of the split sleeve body 11 to bundle the split sleeve body 11 to form the sheath 1. The binding member 2 plays a role in limiting the split sleeve body 11.

[0030] In one embodiment, an elastic seal (not shown in the figure) is provided on at least one end face in the axial direction of the sheath 1. The elastic seal can be made of rubber material. At least one opening is provided in the circumferential direction of the elastic seal. Preferably, elastic seals are provided on both axial end faces of the sheath 1. During use, the elastic seal is arranged between the sheath 1 and the limit seat 4 to further isolate the valve stem 31 from the air. At the same time, since the elastic seal is an elastic member, it can well compensate for the gap between the sheath 1 and the limit seat 4, reducing the dimensional requirements for the sheath 1. In addition, the elastic seal is disconnected in the circumferential direction so that the elastic seal can be easily installed and disassembled. It can be understood that the dimension of the elastic seal in the radial direction of the valve stem 31 can be the same as that of the sheath 1.

[0031] In one embodiment, the sheath 1 is made of polytetrafluoroethylene material. According to this application, the sheath 1 is not limited to being made of polytetrafluoroethylene material and can also be made of other heat-insulating materials, such as nylon. This setting method is easy to form and has low production costs.

[0032] In one embodiment, the thickness of the sheath 1 is not less than 8 mm. For example, the thickness of the sheath 1 is 8 mm, 9 mm or 10 mm. The thickness of the sheath 1 refers to the dimension of the sheath 1 in the radial direction of the valve stem 31. For example, in the case where the sheath 1 is a cylindrical sleeve, the thickness of the sheath 1 is the difference between the outer wall radius and the inner wall radius of the sheath 1. This setting can effectively ensure the heat-insulating effect of the sheath 1, thereby improving the anti-icing effect of the valve stem 31.

[0033] Preferably, the sheath 1 includes at least three sub-sheath bodies 11. In the present application, Figure 1 an embodiment is given in which the sheath 1 includes four sub-sheath bodies 11. However, the present application is not limited to the above arrangement. That is to say, according to the actual situation, the protective sheath 1 may include two, three, four, five or more sub-sheath bodies 11. For the convenience of production, easy installation and cost reduction, the sheath 1 can be divided into three, four or five sub-sheath bodies 11. Such an arrangement is not only easy to manufacture as described above, but especially can well avoid interference with, for example, bolts during the installation process, and the installation operation is convenient. Further preferably, the butt joint surface between the circumferentially adjacent sub-sheath bodies 11 extends along the axial direction of the sheath 1 (which is the same as the axial direction of the valve stem 31 and the same as the up and down direction in Figure 1 ). Such an arrangement can simplify the structure of the sheath 1 and is easy to implement.

[0034] The circumferentially adjacent sub-sheath bodies 11 are in an uneven mating contact. That is to say, as Figure 1 shown, the butt joint surface where the sub-sheath body 11 is combined with another sub-sheath body 11 is not one. Such an arrangement plays a positioning role in the installation of the sub-sheath body 11 and is convenient for the installation of the sub-sheath body 11. At the same time, the two adjacent sub-sheath bodies 11 partially overlap in the radial direction of the sheath 1, which can improve the isolation effect of the sheath 1 and the ability to prevent the valve stem 31 from contacting the outside air.

[0035] To simplify the structure and reduce the manufacturing cost, the sheath 1 can be equally divided in the circumferential direction. Such an arrangement can also simplify the installation of the sub-sheath body 11.

[0036] A plastic film (not shown in the figure) is wound around the outer wall of the sheath 1. The binding member 2 is arranged on the outer wall of the plastic film. The plastic film is strip-shaped and can be conveniently wound around the outer wall of the sheath 1 during installation. On the one hand, the plastic film can fix the split sheath 1 to make multiple sub-sheath bodies 11 form the sheath 1; on the other hand, the plastic film improves the protective and air-isolating effect.

[0037] According to the present application, the binding member 2 can be at least one of a pipe clamp and a cable tie. In the Figure 4 and 5 of the present application, an embodiment is shown in which the binding member 2 is configured as a pipe clamp. It can be understood that the binding member 2 can be provided with one or more according to needs. If a plurality of binding members 2 are arranged on the outer wall of a sheath 1, these binding members 2 can be the same or different. The pipe clamp can be made of stainless steel.

[0038] The present application also relates to a low-temperature methanol washing device. As Figure 3As shown in the figure, the low-temperature methanol washing equipment includes a valve 3, an actuator 5, a limiting seat 4, and the above-mentioned sheath device. The valve 3 includes a valve body 32 and a valve stem 31 extending out of the valve body 32. The actuator 5 is connected to the extending end of the valve stem 31 and is used to move under the drive of the valve stem 31. The limiting seat 4 is arranged between the actuator 5 and the valve body 32. One end of the limiting seat 4 is fixed to the actuator 5, and the other end of the limiting seat 4 is fixed to the valve body 32. The valve stem 31 passes through the limiting seat 5. The sheath 1 is arranged in the limiting seat 4 and sleeved on the outer wall of the valve stem 31. It can be seen that by arranging the sheath 1, the valve stem 31 arranged between the actuator 5 and the valve body 32 can be protected, the risk of icing can be reduced, which is helpful for the normal operation of the valve 3 and the entire low-temperature methanol washing equipment.

[0039] The limiting seat 4 is arranged between the actuator 5 and the valve body 32. The limiting seat 4 itself includes an upper support plate 41, a lower support plate 42, and a connecting member 43 arranged between the upper support plate 41 and the lower support plate 42. The upper support plate 41 is used to abut against and fix the actuator 5. The lower support plate 42 is used to abut against and fix the valve body 32. For example, the upper support plate 41 and the actuator 5, as well as the lower support plate 42 and the valve body 32, can be fixed by bolts 6. The connecting member 43 is arranged between the upper support plate 41 and the lower support plate 42, mainly playing a connecting role. The connecting member 43 can be plate-shaped, columnar, or block-shaped. After the sheath 1 is installed, it is located between the upper support plate 41 and the lower support plate 42. An elastic seal can be arranged between one end face of the sheath 1 and the upper support plate 41, and an elastic seal can also be arranged between the other end face of the sheath 1 and the lower support plate 42.

[0040] The sheath 1 and the valve stem 31 are in clearance fit, and the clearance between the two is 0.1 - 0.2 mm. For example, 0.1 mm, 0.15 mm, or 0.2 mm. This setting can ensure that the sheath 1 does not affect the normal operation of the valve stem 31 and can also play a good protective and heat-insulating effect.

[0041] In this application, the structures of the valve 3 and the actuator 5 are not improved. Only a sheath device is added to ensure the normal operation of the valve 3 and the actuator 5. It can be understood that this sheath device can be applied between similar valves 3 and actuators 5, where the valve stem has an externally leaking section, and due to its application in the low-temperature methanol process, the valve stem is prone to icing. It can be seen that through the sheath device of this application, the problem of ice freezing and jamming of the valve stem of the cryogenic valve can be effectively solved, ensuring the safe operation of the valve.

[0042] Although the preferred embodiments of the present utility model have been described, those skilled in the art can make additional changes and modifications to these embodiments once they learn the basic creative concepts. Therefore, the appended claims are intended to be interpreted to include the preferred embodiments as well as all changes and / or modifications that fall within the scope of the present utility model. Any changes and / or modifications made in accordance with the embodiments of the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A sheath device for a valve of a low-temperature methanol washing equipment, characterized in that, It includes a cylindrical sheath for sleeving onto the outer wall of a partial valve stem of the valve in a gap mode. The sheath is configured as a circumferentially separated split type to include a plurality of split sleeve bodies, and a binding member is arranged on the outer wall of the split sleeve bodies to define the split sleeve bodies and form the sheath.

2. The sheath device of the valve of the low-temperature methanol washing equipment according to claim 1, characterized in that, An elastic seal is arranged on at least one end face in the axial direction of the sheath, and at least one opening is arranged in the circumferential direction of the elastic seal.

3. The sheath device of the valve of the low-temperature methanol washing equipment according to claim 1, characterized in that, The sheath is made of one of polytetrafluoroethylene and nylon materials.

4. The sheath device of the valve of the low-temperature methanol washing equipment according to claim 3, characterized in that, The thickness of the sheath is not less than 8 millimeters.

5. The sheath device of the valve of the low-temperature methanol washing equipment according to claim 1, characterized in that, The sheath includes at least three of the split sleeve bodies, and the docking surface between the circumferentially adjacent split sleeve bodies extends along the axial direction of the sheath.

6. The sheath device of the valve of the low-temperature methanol washing equipment according to any one of claims 1 to 5, characterized in that, The circumferentially adjacent split sleeve bodies are in concave-convex mating contact.

7. The sheath device of the valve of the low-temperature methanol washing equipment according to any one of claims 1 to 5, characterized in that, A plastic film is wound around the outer wall of the sheath, and the binding member is arranged on the outer wall of the plastic film.

8. The sheath device of the valve of the low-temperature methanol washing equipment according to any one of claims 1 to 5, characterized in that, The binding member is at least one of a pipe clamp and a cable tie.

9. A low-temperature methanol washing device, characterized in that, It includes: a valve, the valve includes a valve body and a valve stem extending out of the valve body, an actuator connected to the extending end of the valve stem, a limiting seat arranged between the actuator and the valve body, one end of the limiting seat is fixed to the actuator and the other end is fixed to the valve body, and the valve stem passes through the limiting seat, a sheath device for the valve of the low-temperature methanol washing equipment according to any one of claims 1 to 8, the sheath is arranged in the limiting seat and sleeved on the outer wall of the valve stem.

10. The low-temperature methanol washing equipment according to claim 9, wherein The gap between the sheath and the valve stem is 0.1 to 0.2 millimeters.

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