Pressure reducing control valve and coal liquefaction apparatus

Abstract

The present disclosure relates to a pressure reducing control valve and a coal liquefaction device, wherein the pressure reducing control valve comprises a valve body, a valve seat and a valve core, the valve seat is fixed inside the valve body, one end of the valve core is connected with an actuator, the other end can move towards or away from the valve seat, a plurality of sleeves are arranged inside the valve body and stacked in the vertical direction at the bottom of the valve seat, the top surface of the sleeve is formed with a through hole for the valve core to pass through, and the top of the sleeve is radially inwardly recessed to form a stepped surface, the opening of the upper one of the two adjacent sleeves is sleeved on the stepped surface of the lower sleeve, and flow holes are arranged on the sleeve, which can disperse the fluid pressure through the sleeve in layers, reduce the risk of single-point seal failure, and ensure coaxiality through the radial step cooperation to avoid valve core jamming. The first sealing gasket between the adjacent sleeves closely contacts with the mounting surface to form a sealing system, which can still maintain the overall sealing performance even if the single-layer seal fails.

Description

Technical Field

[0001] This disclosure relates to the field of coal liquefaction equipment technology, specifically to a pressure-reducing control valve and a coal liquefaction equipment. Background Technology

[0002] Due to the extremely harsh process conditions, control valves used in direct coal liquefaction plants have long faced challenges. Under conditions of high flow rates, high temperatures, high pressure differentials, and the presence of solid particles, the flow velocity of the medium increases dramatically after depressurization, causing severe erosion and wear on the valve internals. Cavitation and flash evaporation easily occur after medium depressurization, leading to damage, breakage, and failure of valve internals. This affects regulation stability or even renders regulation impossible. In more severe cases, valve vibration, jamming, failure to close, and fluid leakage may occur. These defects in control valves seriously restrict the stability of the plant and affect its long-term stable operation. Utility Model Content

[0003] The purpose of this disclosure is to provide a pressure-reducing control valve and a coal liquefaction device to at least partially solve the technical problems existing in the related art.

[0004] To achieve the above objectives, this disclosure provides a pressure-reducing control valve, including a valve body, a valve seat, and a valve core. The valve seat is fixed inside the valve body. One end of the valve core is connected to an actuator, and the other end can move towards or away from the valve seat. The valve body also provides a plurality of sleeves stacked vertically at the bottom of the valve seat with their openings facing downwards. The top surface of each sleeve has a through hole for the valve core to pass through, and the top of each sleeve is radially recessed to form a stepped surface. The opening of the upper sleeve of two adjacent sleeves is fitted onto the stepped surface of the lower sleeve. A first sealing gasket is provided between the mating surfaces of two adjacent sleeves.

[0005] Optionally, the first sealing gasket is provided between the bottom of the valve seat and the sleeve.

[0006] Optionally, the sleeve is provided with a flow orifice.

[0007] Optionally, it also includes a valve cover installed on the top of the valve body. The valve cover and the side of the valve body facing the valve body are provided with an annular boss protruding towards the valve body. The valve body is formed with an annular slot for engaging with the annular boss. A second sealing gasket is provided between the mating surfaces of the annular boss and the annular slot.

[0008] Optionally, it further includes a connecting sleeve that is vertically connected between the actuator and the valve stem, wherein the output shaft of the actuator and the end of the valve stem are respectively inserted into the two ends of the connecting sleeve.

[0009] Optionally, the pressure-reducing control valve further includes a valve stem, a guide hole is provided at the center of the valve cover, one end of the valve stem is connected to the valve core, and the other end, which is away from the valve core, passes through the guide hole and is connected to the actuator. The guide hole has a receiving groove on its inner wall, and the receiving groove is filled with sealing packing.

[0010] Optionally, the valve stem is welded to the valve core.

[0011] Optionally, the valve core is provided with an annular mounting groove corresponding to the position of the valve seat, and the pressure reducing control valve further includes a metal sealing ring for embedding in the annular mounting groove and for fitting against the valve seat.

[0012] Optionally, the valve core is provided with multiple balance holes.

[0013] A second aspect of this disclosure is to provide a coal liquefaction apparatus, including the pressure-reducing control valve described above.

[0014] The aforementioned technical solution incorporates multiple sleeves within the pressure-reducing control valve, significantly improving sealing reliability and ease of maintenance. Through nested, stepped positioning, the valve core passes through the sleeve's through-hole for precise guidance. This design, on the one hand, reduces the risk of single-point seal failure by dispersing fluid pressure through layered sleeves; on the other hand, the radial step fit ensures coaxiality, preventing valve core jamming. The first sealing gasket between adjacent sleeves fits tightly against the mounting surface, forming a sealing system that maintains overall sealing even if a single layer of seal fails.

[0015] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a half-sectional view of the overall structure of the pressure-reducing control valve provided in an exemplary embodiment of this disclosure;

[0018] Figure 2 This is a half-sectional view of the overall structure of the valve core provided in the exemplary embodiment of this disclosure.

[0019] Explanation of reference numerals in the attached figures

[0020] 1-Valve body; 2-Valve seat; 3-Valve core; 301-First valve core; 302-Second valve core; 303-Third valve core; 4-Sleeve; 41-First sealing gasket; 5-Valve cover; 51-Guide hole; 52-Receiving groove; 53-Sealing packing; 61-Annular boss; 62-Annular slot; 63-Second sealing gasket; 7-Valve stem; 8-Actuator; 9-Connecting sleeve; 91-Bolt; 92-Nut. Detailed Implementation

[0021] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0022] In this disclosure, unless otherwise stated, directional terms such as "inner" and "outer" refer to the outline of the corresponding component itself; directional terms such as "top," "bottom," and "vertical" are defined based on the usage habits of the pressure-reducing control valve provided in this disclosure. Specifically, please refer to... Figure 1 The orientation of the drawing is shown. Terms such as "first" and "second" used in this disclosure are for distinguishing one element from another and do not indicate sequence or importance. Furthermore, in the following description, when referring to the accompanying drawings, the same reference numerals in different drawings denote the same or similar elements.

[0023] Reference Figure 1 and Figure 2 This disclosure provides a pressure-reducing control valve, which may include a valve body 1, a valve seat 2, and a valve core 3. The valve seat 2 can be fixed inside the valve body 1. One end of the valve core 3 can be connected to an actuator 8, and the other end of the valve core 3 can move towards or away from the valve seat 2 under the drive of the actuator 8, thereby realizing the opening and closing of the pressure-reducing control valve and pressure regulation. Multiple sleeves 4 can also be arranged inside the valve body 1, stacked vertically at the bottom of the valve seat 2 with their openings facing downwards. In the embodiments provided in this disclosure, the number of sleeves 4 can be five, but this disclosure is not limited to this and can be adaptively adjusted according to specific working conditions. The top surface of the sleeve 4 can form a through hole for the valve core 3 to pass through, which avoids interference with the movement of the valve core 3 and also guides the reciprocating movement of the valve core 3. The top of the sleeve 4 is radially recessed to form a stepped surface, and the opening of the upper sleeve 4 of two adjacent sleeves 4 is fitted onto the stepped surface of the lower sleeve 4 to achieve precise positioning between adjacent sleeves 4. Flow holes can be provided on each of the multiple sleeves 4. By setting multiple flow orifices, multi-stage pressure reduction can be achieved. Through smooth pressure gradient control, the vibration and erosion of the pressure-reducing control valve are effectively reduced, extending its service life. In the embodiments provided in this disclosure, the multiple sleeves 4 are detachably connected, facilitating the individual disassembly and replacement of each sleeve 4, significantly reducing maintenance costs.

[0024] Through the above technical solution, the pressure-reducing control valve is internally equipped with multiple sleeves 4, which significantly improves sealing reliability and ease of maintenance. The valve core 3 is precisely guided through the sleeve through-holes via nested stepped surfaces for positioning. This design, on the one hand, reduces the risk of single-point seal failure by dispersing fluid pressure through the layered sleeves 4; on the other hand, the radial step fit ensures coaxiality and prevents the valve core 3 from jamming. The first sealing gasket 41 between adjacent sleeves 4 fits tightly against the mounting surface, forming a sealing system that maintains overall sealing even if a single layer of seal fails.

[0025] In the embodiments provided in this disclosure, in order to achieve long-term wear resistance of valve seat 2, valve core 3, and sleeve 4, plasma welding process can be used to harden the sealing surface and guide surface. The hardened layer thickness is ≥3mm, the hardness is ≥55HRC, and the hardened layer is metallurgically bonded to the substrate with a bonding strength ≥480MPa.

[0026] Reference Figure 1 A first sealing gasket 41 is provided between the mating surfaces of two adjacent sleeves 4, forming a multi-level sealing barrier to ensure the sealing effect between the sleeves 4. A first sealing gasket 41 can also be provided between the bottom of the valve seat 2 and the sleeve 4. Providing a sealing gasket 41 between the valve seat 2 and the sleeve 4 improves the sealing reliability between the bottom of the valve seat 2 and the sleeve 4, prevents media leakage, and ensures the long-term stable operation of the pressure-reducing control valve. The first sealing gasket 41 can be a graphite gasket. By selecting a graphite gasket to seal between the valve seat 2 and the sleeve 4, and between each sleeve 4, the first sealing gasket 41 can maintain a long-term stable seal in high-pressure, high-temperature, and corrosive media, while also adapting to minor deformations of the mounting surface, reducing the risk of leakage.

[0027] Reference Figure 1The pressure-reducing control valve may also include a valve cover 5 mounted on top of the valve body 1. The valve cover 5 and the valve body 1 have an annular boss 61 protruding towards the valve body 1 on the side facing the valve body 1. The valve body 1 has an annular slot 62 corresponding to the annular boss 61 for engaging with it. A second sealing gasket 63 is provided between the mating surfaces of the annular boss 61 and the annular slot 62. This design significantly improves the sealing performance between the valve cover 5 and the valve body 1. The embedded structure of the annular boss 61 enhances the axial installation accuracy of the valve cover 5 and the valve body 1, while effectively dispersing fluid pressure impacts. The second sealing gasket 63 fills the microscopic gaps between the mating surfaces of the valve body 1 and the valve cover 5, effectively preventing media leakage. This plug-in structure facilitates quick alignment during assembly and reduces bolt preload requirements, thus balancing high-pressure sealing reliability and maintenance convenience. The valve cover 5 and the valve body 1 can be respectively provided with corresponding threaded holes. The bolt 91 can be inserted into the threaded hole on the valve body 1 through the threaded hole on the valve cover 5, and then connected to the bolt 91 by the nut 92 for fastening, thereby further ensuring the sealing force and fastening force at the connection between the valve body 1 and the valve cover 5.

[0028] Reference Figure 1 A guide hole is provided at the center of the valve cover 5. One end of the valve stem 7 is connected to the valve core 3, and the other end, away from the valve core 3, passes through the guide hole 51 and is connected to the actuator 8. The inner wall of the guide hole 51 is provided with a receiving groove 52, which is filled with sealing packing 53. By filling the receiving groove 52 with sealing packing 53, in the embodiments provided in this disclosure, the sealing packing 53 can be made of a flexible material. This ensures that the valve stem 7 can move flexibly when passing through, ensuring a reliable dynamic seal between the valve stem 7 and the valve cover 5. At the same time, the elastic deformation of the material can tightly fit the gap between the valve stem 7 and the guide hole 51, effectively preventing the medium from leaking along the valve stem. It also reduces the friction and wear of the valve stem 7 during movement, improving the sealing reliability and the service life of the components.

[0029] Reference Figure 1The pressure-reducing control valve may further include a connecting sleeve 9 vertically connected between the actuator 8 and the valve stem 7. The output shaft of the actuator 8 and the end of the valve stem 7 are respectively inserted into the two ends of the connecting sleeve 9. By using the connecting sleeve 9 to connect the actuator 8 and the valve stem 7, a detachable connection between the actuator 8 and the valve stem 7 is achieved, which facilitates the maintenance of the pressure-reducing control valve (such as replacing the valve stem 7 or the actuator 8). In the embodiments provided in this disclosure, in order to further improve the connection strength and installation convenience between the connecting sleeve 9 and the actuator 8 and the valve stem 7, the connecting sleeve 9 may be composed of two arc-shaped mounting plates with a cross-section of 180°. The two mounting plates may be respectively provided with threaded holes with corresponding positions. Bolts 91 may pass through the mounting holes on the two mounting plates in sequence, and then be threadedly connected to bolts 91 by nuts 92 to realize the splicing of the two mounting plates, thereby ensuring the structural strength of the connecting sleeve 9 and the reliability of the connection process.

[0030] In the embodiments provided in this disclosure, the valve stem 7 is welded and fixed to the valve core 3, thereby ensuring the reliability of the connection between the valve stem 7 and the valve core 3. In this disclosure, the valve stem 7 can be first connected by threads and then fixed by welding during the assembly process with the valve core 3. This ensures the precise positioning of the valve stem 7 and the valve core 3 during the welding process and improves the assembly accuracy between components.

[0031] like Figure 2 As shown, the valve core 3 may include a first valve core 301, a second valve core 302, and a third valve core 303. The first valve core 301, the second valve core 302, and the third valve core 303 can be first connected by threads and then welded together, thus ensuring both the strength of the connection between the valve cores and their precise connection. The second valve core 302 and the third valve core 303 have multiple balance holes, which effectively reduce the unbalanced force within the pressure-reducing control valve and ensure that the medium pressure on the bottom and top surfaces of the valve core 3 tends to be balanced, preventing the valve core 3 from being forced to move towards the side with lower pressure. This reduces the drive load, improves control accuracy, and extends the lifespan of the pressure-reducing control valve.

[0032] Reference Figure 1 The valve core 3 has an annular mounting groove on its peripheral wall corresponding to the position of the valve seat 2. The pressure-reducing control valve also includes a metal sealing ring for embedding in the annular mounting groove and fitting snugly against the valve seat 2. The tight fit between the metal sealing ring and the valve seat 2 effectively withstands high pressure, high temperature, and corrosive media, reducing the risk of leakage. Furthermore, the metal sealing ring mounting structure formed by the valve core 3 itself, namely the annular mounting groove, further ensures the reliability of the metal sealing ring's mounting position and guarantees a sealing effect.

[0033] A second aspect of this disclosure provides a coal liquefaction apparatus, including a pressure-reducing control valve according to this disclosure, which has all the beneficial effects of the pressure-reducing control valve provided in this disclosure, which will not be elaborated here.

[0034] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0035] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0036] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A pressure-reducing control valve, characterized in that, The valve includes a valve body, a valve seat, and a valve core. The valve seat is fixed inside the valve body. One end of the valve core is connected to an actuator, and the other end can move towards or away from the valve seat. The valve body also has multiple sleeves stacked vertically at the bottom of the valve seat with their openings facing downwards. The top surface of each sleeve has a through hole for the valve core to pass through, and the top of each sleeve is radially recessed to form a stepped surface. The opening of the upper sleeve of two adjacent sleeves is fitted onto the stepped surface of the sleeve below it. Each sleeve has a flow orifice.

2. The pressure-reducing control valve according to claim 1, characterized in that, A first sealing gasket is provided between the mating surfaces of two adjacent sleeves, and the first sealing gasket is also provided between the bottom of the valve seat and the topmost sleeve.

3. The pressure-reducing control valve according to claim 2, characterized in that, The first sealing gasket is made of graphite.

4. The pressure-reducing control valve according to claim 1, characterized in that, It also includes a valve cover installed on the top of the valve body. The valve cover and the side of the valve body facing the valve body are provided with an annular boss protruding towards the valve body. The valve body is formed with an annular slot for engaging with the annular boss. A second sealing gasket is provided between the mating surfaces of the annular boss and the annular slot.

5. The pressure-reducing control valve according to claim 4, characterized in that, The pressure-reducing control valve also includes a valve stem. A guide hole is provided at the center of the valve cover. One end of the valve stem is connected to the valve core, and the other end, which is away from the valve core, passes through the guide hole and is connected to the actuator. The guide hole has a receiving groove on its inner wall, and the receiving groove is filled with sealing packing.

6. The pressure-reducing control valve according to claim 5, characterized in that, It also includes a connecting sleeve that connects vertically between the actuator and the valve stem, with the output shaft of the actuator and the end of the valve stem respectively inserted into both ends of the connecting sleeve.

7. The pressure-reducing control valve according to claim 6, characterized in that, The valve stem is welded and fixed to the valve core.

8. The pressure-reducing control valve according to claim 1, characterized in that, The valve core is provided with an annular mounting groove corresponding to the position of the valve seat, and the pressure reducing control valve also includes a metal sealing ring for being embedded in the annular mounting groove and fitted to fit against the valve seat.

9. The pressure-reducing control valve according to claim 1 or 8, characterized in that, The valve core has multiple balance holes.

10. A coal liquefaction device, characterized in that, Includes the pressure-reducing control valve according to any one of claims 1-9.

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