Anti-erosion high temperature and high pressure regulating valve

Abstract

The application discloses a kind of high temperature high pressure governing valve of scouring prevention, including, governing valve containing mechanism, including shell, the protection assembly of being set on the shell, and the through-flow assembly of being set on the shell;Governing valve piston mechanism, including piston rod, the opening and closing component of being set on the piston rod, the sealing component of being set on the piston rod, and the operating component of being set on the piston rod, by setting buffer component on governing valve, so that its first level protection zone forms intercepting section, can effectively reduce steam flow rate, utilize second level protection zone to increase the expansion buffer section of valve core face of meeting, simultaneously utilize the outer rafter of third level protection zone, effectively avoid steam directly impacting main sealing surface, simultaneously prevent the bruise of sealing surface caused by oxide skin and other foreign matters, prevent the erosion of main sealing surface, prevent oxide skin and other foreign matters deposition.

Description

Technical Field

[0001] This invention relates to the technical field of high-temperature and high-pressure regulating valves, and more particularly to an anti-erosion high-temperature and high-pressure regulating valve. Background Technology

[0002] Currently, the high and low pressure bypass valves of 600MW and above coal-fired power generating units in China generally use imported brands. These valves frequently experience internal leakage defects during long-term operation, requiring significant manpower, resources, and funds for repairs with limited effectiveness. Therefore, some power plants have gradually implemented domestic modifications to the valve core and seat components, but the results have varied and the problem has not been completely resolved, seriously affecting the unit's economy and safety. Under system conditions of high pressure differential and high temperature media, the erosion damage to the main sealing surface of the valve is a direct cause of leakage. Modeling calculations show that when the pressure difference across the valve is >15MPa and the flow is at a small opening, the medium velocity is higher, resulting in a more pronounced erosion effect on the valve core. This further illustrates that prolonged operation under these conditions rapidly exacerbates the erosion of the valve core components. Summary of the Invention

[0003] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0004] In view of the problem that the main sealing surface of the existing anti-erosion high temperature and high pressure regulating valve is easily eroded and damaged, which causes leakage, the present invention is proposed.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a high-temperature and high-pressure regulating valve for erosion prevention, comprising: a regulating valve housing mechanism, including a housing, a protective component disposed on the housing, and a flow-through component disposed on the housing; and a regulating valve piston mechanism, including a piston rod, an opening and closing component disposed on the piston rod, a sealing component disposed on the piston rod, and an operating component disposed on the piston rod.

[0006] In a preferred embodiment of the anti-erosion high-temperature and high-pressure regulating valve of the present invention, a valve seat is provided inside the housing, and a valve cage is provided on the valve seat; the valve cage is connected to the housing by fastening bolts, and the valve cage is connected to the valve seat by fastening bolts.

[0007] In a preferred embodiment of the anti-erosion high temperature and high pressure regulating valve of the present invention, the valve cage is provided with an airflow port, and the airflow port is provided with an airflow filter pad; an airtight component is provided between the valve cage and the housing.

[0008] As a preferred embodiment of the anti-erosion high temperature and high pressure regulating valve of the present invention, the protective component includes a first-level protective belt, a second-level protective belt, and a third-level protective belt disposed between the valve cage and the opening and closing component; the first-level protective belt is convex, the second-level protective belt is concave, and the third-level protective belt and the valve seat are both provided with external rafters.

[0009] As a preferred embodiment of the anti-erosion high temperature and high pressure regulating valve of the present invention, the flow-through component includes an inlet pipe disposed on the housing and an outlet pipe disposed on the housing.

[0010] As a preferred embodiment of the anti-erosion high temperature and high pressure regulating valve of the present invention, the opening and closing assembly includes a main valve core disposed on the piston rod, a compression pad disposed on the main valve core, and a pressure bearing member disposed on the valve cage.

[0011] As a preferred embodiment of the anti-erosion high temperature and high pressure regulating valve of the present invention, the pressure-bearing component includes a pressure-bearing pipe disposed on the valve cage, a movable pipe disposed on the pressure-bearing pipe, and an elastic component disposed within the movable pipe.

[0012] In a preferred embodiment of the anti-erosion high-temperature and high-pressure regulating valve of the present invention, the sealing assembly includes two sealing elements disposed between the valve cage and the piston rod; the two sealing elements are symmetrically arranged.

[0013] As a preferred embodiment of the anti-erosion high temperature and high pressure regulating valve of the present invention, the sealing element is provided with two composite gaskets, and a graphite ring is provided between the two composite gaskets.

[0014] In a preferred embodiment of the anti-erosion high temperature and high pressure regulating valve of the present invention, the operating component includes a limiting handle disposed on the piston rod and an operating button disposed on the piston rod.

[0015] The beneficial effects of this invention are as follows: By setting a buffer component on the regulating valve, the first-stage protective band forms a flow interception section, which can effectively reduce the steam flow rate. The second-stage protective band increases the expansion buffer section at the flow-facing surface of the valve core. At the same time, the outer rafter of the third-stage protective band effectively prevents steam from directly impacting the main sealing surface, while preventing damage to the sealing surface caused by foreign matter such as oxide scale, preventing erosion of the main sealing surface, and preventing the deposition of foreign matter such as oxide scale. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0017] Figure 1 This is a schematic diagram of the overall structure of the anti-erosion high temperature and high pressure regulating valve of the present invention.

[0018] Figure 2 This is an enlarged schematic diagram of the sealing component structure of the anti-erosion high-temperature and high-pressure regulating valve of the present invention.

[0019] Figure 3 This is an enlarged schematic diagram of the protective component of the anti-erosion high-temperature and high-pressure regulating valve of the present invention. Detailed Implementation

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0022] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0023] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0024] Example 1

[0025] Reference Figure 1 A schematic diagram of the overall structure of a high-temperature and high-pressure anti-erosion regulating valve is provided, as shown below. Figure 1A high-temperature and high-pressure regulating valve for erosion protection includes a regulating valve housing mechanism 100, comprising a housing 101, a protective component 102 disposed on the housing 101, and a flow-through component 103 disposed on the housing 101; and a regulating valve piston mechanism 200, comprising a piston rod 201, an opening and closing component 202 disposed on the piston rod 201, a sealing component 203 disposed on the piston rod 201, and an operating component 204 disposed on the piston rod 201, wherein the operating component 204 is used to control the opening and closing state of the regulating valve, and the specific opening timing is controlled by a remote DCS system at the monitoring center.

[0026] Specifically, a valve seat 101a is provided inside the housing 101, and a valve cage 101b is provided on the valve seat 101a; the valve cage 101b is connected to the housing 101 by fastening bolts, and the valve cage 101b is connected to the valve seat 101a by fastening bolts.

[0027] Furthermore, the valve cage 101b is provided with an airflow port 101b-1, and an airflow filter pad 101b-2 is provided on the airflow port 101b-1; an airtight component 101b-3 is provided between the valve cage 101b and the housing 101, wherein the airflow port 101b-1 can be filled with steam, and the airtight component 101b-3 is used to ensure the airtightness of this operation process and prevent leakage.

[0028] Operation process: When this regulating valve needs to be opened, the opening command is sent through the remote DCS system of the upper monitoring center. Then, by pulling the operating component 204, the opening and closing component 202 is brought to the open state, so that steam can flow in and out of the flow component 103. During this process, the sealing component 203 can prevent the leakage of high temperature and high pressure steam.

[0029] Example 2

[0030] Reference Figure 1-3This embodiment differs from the first embodiment in that the protective component 102 includes a first-stage protective strip 102a, a second-stage protective strip 102b, and a third-stage protective strip 102c disposed between the valve cage 101b and the opening / closing component 202. The first-stage protective strip 102a is convex in shape. Here, a flow-blocking section is provided on the outer circumference of the valve core. Its main function is to cut off the high-pressure medium first when the valve is open at a small degree, limit the incoming steam flow, reduce the flow velocity, and minimize the erosion of the sealing surface by steam, thus preventing small openings from causing damage. To prevent damage to the sealing surface and improve valve life, the second-stage protective strip 102b is concave in shape. The enlarged buffer section at the valve core's flow-facing surface further reduces the flow velocity of high-pressure steam through the buffer section, thus mitigating the damage to the sealing surface caused by high-speed steam. The third-stage protective strip 102c and valve seat 101a are both equipped with external rafters 102c-1. The external rafters 102c-1 effectively prevent steam from directly impacting the main sealing surface and also prevent damage to the sealing surface caused by foreign matter such as oxide scale.

[0031] Specifically, the flow assembly 103 includes an inlet pipe 103a disposed on the housing 101 and an outlet pipe 103b disposed on the housing 101, wherein the inlet pipe 103a and the outlet pipe 103b are used to accommodate the passage of steam.

[0032] Furthermore, the opening and closing assembly 202 includes a main valve core 202a disposed on the piston rod 201, a compression pad 202b disposed on the main valve core 202a, and a pressure bearing member 202c disposed on the valve cage 101b. The compression pad 202b can reduce the impact loss on the internal structure and help extend the service life of the regulating valve.

[0033] Furthermore, the pressure-bearing component 202c includes a pressure-bearing pipe 202c-1 disposed on the valve cage 101b, a movable pipe 202c-2 disposed on the pressure-bearing pipe 202c-1, and an elastic component 202c-3 disposed within the movable pipe 202c-2.

[0034] The rest of the structure is the same as in Example 1.

[0035] Operating Procedure: As the gas flows from the inlet pipe 103a through the outlet pipe 103b, the intercepting section formed at the first-stage protective zone 102a can cut off the high-pressure medium at a small opening, thereby limiting the flow rate of steam. The expansion buffer section formed at the second-stage protective zone 102b can further reduce the flow velocity of high-pressure steam through the buffer section, further reducing the damage of high-speed steam to the sealing surface. In the third-stage protective zone 102c, the external rafter 102c-1 is set to effectively prevent steam from directly impacting the main sealing surface; at the same time, it prevents damage to the sealing surface caused by foreign matter such as oxide scale. When the valve is closed, a steam vortex will be formed in the concave part of the valve seat, which will carry away foreign matter such as oxide scale, preventing foreign matter from depositing and causing the valve core to not close tightly.

[0036] Example 3

[0037] Reference Figure 1-3 The difference between this embodiment and the previous embodiment is that the sealing assembly 203 includes two seals 203a disposed between the valve cage 101b and the piston rod 201; the two seals 203a are symmetrically arranged, and the double-layer sealing arrangement here can maximize the airtightness of the device, and it can still operate when a single seal 203a is damaged.

[0038] Specifically, two composite gaskets are provided inside the seal 203a, and a graphite ring is provided between the two composite gaskets. The use of composite gaskets and graphite rings ensures that the device is airtight and prevents leakage of high-pressure and high-temperature steam.

[0039] Furthermore, the operating component 204 includes a limit handle 204a disposed on the piston rod 201 and an operating button 204b disposed on the piston rod 201. This is provided to facilitate the DCS system at the monitoring center to control the opening and closing of the regulating valve.

[0040] The rest of the structure is the same as in Example 2.

[0041] Operation process: During the above process, the regulating valve controls the operating component 204 through the DCS system, causing the piston rod 201 to drive the main valve core 202a in the opening and closing component 202, thereby opening the regulating valve and ensuring that high-pressure steam can pass through the regulating valve. Then, during this steam transmission process, the sealing element 203a, through the setting of composite gasket and graphite ring, ensures the internal airtightness of this regulating valve, so that the internal high-pressure steam will not leak during operation.

[0042] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0043] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0044] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0045] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A high-temperature and high-pressure regulating valve for preventing erosion, characterized in that: include, The regulating valve receiving mechanism (100) includes a housing (101), a protective component (102) disposed on the housing (101), and a flow-through component (103) disposed on the housing (101). The regulating valve piston mechanism (200) includes a piston rod (201), an opening and closing assembly (202) disposed on the piston rod (201), a sealing assembly (203) disposed on the piston rod (201), and an operating assembly (204) disposed on the piston rod (201). The housing (101) is provided with a valve seat (101a) and a valve cage (101b) disposed on the valve seat (101a). The valve cage (101b) is connected to the housing (101) by fastening bolts, and the valve cage (101b) is connected to the valve seat (101a) by fastening bolts; The protective assembly (102) includes a first-level protective belt (102a), a second-level protective belt (102b), and a third-level protective belt (102c) disposed between the valve cage (101b) and the opening and closing assembly (202). The first-level protective strip (102a) is convex, the second-level protective strip (102b) is concave, and the third-level protective strip (102c) and the valve seat (101a) are both provided with external rafters (102c-1). The opening and closing assembly (202) includes a main valve core (202a) disposed on the piston rod (201), a compression pad (202b) disposed on the main valve core (202a), and a pressure bearing member (202c) disposed on the valve cage (101b). The pressure-bearing component (202c) includes a pressure-bearing pipe (202c-1) disposed on the valve cage (101b), a movable pipe (202c-2) disposed on the pressure-bearing pipe (202c-1), and an elastic component (202c-3) disposed within the movable pipe (202c-2).

2. The anti-erosion high-temperature and high-pressure regulating valve as described in claim 1, characterized in that: The valve cage (101b) is provided with an airflow port (101b-1), and an airflow filter pad (101b-2) is provided on the airflow port (101b-1). An airtight component (101b-3) is provided between the valve cage (101b) and the shell (101).

3. The anti-erosion high-temperature and high-pressure regulating valve as described in claim 2, characterized in that: The flow assembly (103) includes an inlet pipe (103a) disposed on the housing (101) and an outlet pipe (103b) disposed on the housing (101).

4. The anti-erosion high-temperature and high-pressure regulating valve as described in claim 3, characterized in that: The sealing assembly (203) includes two seals (203a) disposed between the valve cage (101b) and the piston rod (201). The two seals (203a) are arranged symmetrically.

5. The anti-erosion high-temperature and high-pressure regulating valve as described in claim 4, characterized in that: The sealing element (203a) contains two composite gaskets, and a graphite ring is disposed between the two composite gaskets.

6. The anti-erosion high-temperature and high-pressure regulating valve as described in claim 5, characterized in that: The operating component (204) includes a limiting handle (204a) disposed on the piston rod (201) and an operating button (204b) disposed on the piston rod (201).

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