A erosion-resistant valve for power plants

Abstract

The utility model provides an erosion-resistant valve for a power plant, comprising a valve body (3) and a valve cover (1). The valve cover (1) is fixedly connected to the valve body (3), a valve stem valve core (2) is connected to the valve cover (1), and can telescopically move in the valve body (3) and cooperate with a valve seat (4) in the valve body (3). The valve core is in the shape of a mushroom head and is provided with mutually parallel annular flow guide grooves in its radial direction. The shape of the valve seat (4) is adapted to the valve core. The erosion of the valve internal parts by the fluid in the valve can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to an erosion-resistant valve for power plants. Background Art

[0002] In generator sets above 300MW, the sootblowing steam pressure from the boiler is relatively high (generally 15-17MPa). After passing through the sootblowing electric door, if it directly reaches the sootblowing regulating valve, the excessive pressure will cause damage to it. This device is installed between the sootblowing electric door and the sootblowing regulating valve to adjust its pressure and ensure that the pressure is within the tolerable range of the sootblowing regulating valve. The valves on the market today are basically made of three-way valves with valve stems, valve cores, valve seats, and valve covers. When designing, they often focus on their shutoff and regulation properties, but ignore the erosion of high temperature and high pressure fluids on the valve body and valve internal components. They have the following disadvantages:

[0003] First, the temperature is high, the pressure difference is large, the valve internal parts are easily eroded and damaged, and the service life is short; second, the packing is easily damaged and very easy to leak. Therefore, how to provide a high temperature and high pressure regulating valve for the sootblowing system with stable regulation, long service life, erosion resistance, leakage prevention, and good practicality has become a technical problem to be solved by those skilled in the art. Summary of the invention

[0004] The utility model provides an erosion-resistant valve for a power plant, so as to solve the technical defects existing in the above-mentioned prior art.

[0005] In order to solve the above technical problems, the technical solution of the utility model is an erosion-resistant valve for power plants, including a valve body and a valve cover. The valve cover is fixedly connected to the valve body, and a valve stem and a valve core are connected to the valve cover. They can move telescopically in the valve body and cooperate with a valve seat in the valve body. The valve core is a mushroom head shape and is radially provided with mutually parallel annular guide grooves. The shape of the valve seat is adapted to the valve core.

[0006] Specifically, the valve body of the erosion-resistant valve for power plants is made of 12Cr1MoV / F91 / F92 forgings, the valve trim is made of high-grade stainless steel material, and the whole is subjected to high-grade nitriding and the sealing surface is welded with hard alloy.

[0007] Specifically, the valve body of the erosion-resistant valve for power plants is provided with a valve sleeve, and the valve sleeve is a flow linear and suspended valve sleeve with a multi-stage throttling structure.

[0008] Specifically, a spiral wound gasket is provided above the valve sleeve of the erosion-resistant valve for a power plant.

[0009] Specifically, a serrated pad is provided under the valve sleeve of the erosion-resistant valve for a power plant.

[0010] Specifically, a spacer is provided above the spiral wound gasket of the erosion-resistant valve for a power plant.

[0011] Specifically, the erosion-resistant valve for a power plant adopts a low-inlet and high-outlet structure, and the air inlet channel is lower than the air outlet channel.

[0012] Since the valve core is in the shape of a mushroom head, it is provided with annular guide grooves parallel to each other in the radial direction, and the shape of the valve seat is adapted to the valve core, the utility model can solve the erosion of the valve body and valve internal components by high-temperature and high-pressure steam, and the possibility of leakage is eliminated due to the design of the combined sealing structure. Since the valve adopts a low-inlet and high-outlet structure, the packing is always in a low-pressure area, eliminating the risk of leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present application, rather than limiting the present application.

[0014] Figure 1 This is a front view of a erosion-resistant valve for power plants of the utility model.

[0015] Among them, the valve cover 1, the valve core and valve stem 2, the valve body 3, the valve seat 4, the spacer 5, the winding gasket 6, the valve sleeve 7, the serrated gasket 8 DETAILED DESCRIPTION

[0016] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be clearly and completely described below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of this application.

[0017] Unless otherwise defined, technical or scientific terms used herein shall have the common meanings understood by a person having ordinary skills in the field to which this application belongs.

[0018] The specific implementation methods of the utility model are described in detail and completely below in conjunction with the accompanying drawings.

[0019] like Figure 1As shown, an erosion-resistant valve for power plants includes a valve body 3 and a valve cover 1. The valve cover 1 is fixedly connected to the valve body 3. The valve stem valve core 2 is connected to the valve cover 1 and can telescopically move in the valve body 3 and cooperate with the valve seat 4 in the valve body 3. The valve core is in the shape of a mushroom head and is provided with mutually parallel annular flow guide grooves in the radial direction. The shape of the valve seat 4 is adapted to the valve core. Due to the smooth arc surface structure of the mushroom head shape of the valve core, the erosion of the core body by high-temperature and high-pressure fluids is reduced. The gradually increasing radius has a diversion effect on the fluid. The radially provided mutually parallel annular flow guide grooves further reduce the erosion of the core body by high-temperature and high-pressure fluids. The mushroom head part, the radially provided mutually parallel annular flow guide grooves, and the valve seat jointly realize throttling, gradually reduce the medium pressure, and protect the sealing surface from being washed by the high-pressure fluid.

[0020] Specifically, the valve body 3 of the erosion-resistant valve for power plants is made of 12Cr1MoV / F91 / F92 forgings, and the valve trim is made of high-grade stainless steel material, and is subjected to overall high-grade nitriding and sealing surface cladding treatment of hard alloy. The hardness of the valve trim is increased, and the erosion resistance is further enhanced.

[0021] Specifically, the valve body 3 of the erosion-resistant valve for power plants is provided with a valve sleeve 7, and the valve sleeve 7 is a flow linear and suspended valve sleeve with a multi-stage throttling structure, which further enhances the sealing and throttling effects.

[0022] Specifically, a wound gasket 6 is provided above the valve sleeve 7 of the erosion-resistant valve for power plants. Since the valve sleeve is suspended, a double wound gasket is added to prevent the possibility of leakage.

[0023] Specifically, a serrated pad 8 is provided under the valve sleeve 7 of the erosion-resistant valve for power plants to further enhance the sealing effect.

[0024] Specifically, a spacer sleeve 5 is provided above the spiral wound gasket (6) of the erosion-resistant valve for power plants, which can isolate the environments of different working parts and better position and ensure the cleanliness of the valve stem.

[0025] Specifically, the erosion-resistant valve for power plants is characterized in that the valve adopts a low-inlet and high-outlet structure, and the air inlet channel is lower than the air outlet channel, so that the packing is always in a low-pressure area, eliminating the risk of leakage.

[0026] The above description is merely an exemplary embodiment of the present application and is not intended to limit the protection scope of the present application. The protection scope of the present application is determined by the appended claims.

Claims

1. A erosion-resistant valve for power plants, characterized in that The invention comprises a valve body (3) and a valve cover (1). The valve cover (1) is fixedly connected to the valve body (3). A valve stem valve core (2) is connected to the valve cover (1) and can move telescopically in the valve body (3) and cooperate with a valve seat (4) in the valve body (3). The valve core is in the shape of a mushroom head and is provided with annular flow guide grooves parallel to each other in its radial direction. The shape of the valve seat (4) is adapted to the valve core.

2. The erosion-resistant valve for power plant according to claim 1, characterized in that The valve body (3) is made of 12Cr1MoV / F91 / F92 forgings, and the valve internals are made of high-grade stainless steel materials, which are subjected to overall high-grade nitriding and sealing surface cladding with hard alloy.

3. The erosion-resistant valve for power plant according to claim 1, characterized in that The valve body (3) is provided with a valve sleeve (7), and the valve sleeve (7) is a flow linear and suspended valve sleeve with a multi-stage throttling structure.

4. The erosion-resistant valve for power plant according to claim 3, characterized in that A winding gasket (6) is provided on the valve body (3) above the valve sleeve (7).

5. The erosion-resistant valve for power plant according to claim 3, characterized in that A serrated pad (8) is provided on the valve body (3) below the valve sleeve (7).

6. The erosion-resistant valve for power plant according to claim 4, characterized in that A spacer sleeve (5) is provided on the valve body (3) above the winding pad (6).

7. The erosion-resistant valve for power plant according to any one of claims 1 to 6, characterized in that The valve adopts a low-inlet and high-outlet structure, and the air inlet channel is lower than the air outlet channel.

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