Steam support type temperature and pressure reducing valve

Abstract

The utility model relates to a steam supporting type temperature and pressure reducing valve which is used for a steam temperature and pressure reducing system in the fields of electric power and petrifaction. The steam-supported nozzle valve is composed of a valve body, a steam-supported nozzle assembly, a temperature-reducing water pipe, a pressure-reducing sleeve, a gland, a valve element, a valve rod, a valve cover, a pressing ring, a sealing ring, a four-element ring, a support, an executing mechanism and a throttling orifice plate. The valve body and the valve cover are connected through a sealing ring, a pressing ring and a four-element ring, and the valve body and the pressure reducing sleeve are connected in a pressing mode through a pressing cover. The steam supporting type nozzle assembly is composed of a throttling orifice plate, a check block, a middle body and a nozzle body, and a steam flow channel is formed in the middle of the steam supporting type nozzle assembly. A desuperheating water cavity A and a desuperheating water annular runner are arranged between the middle body and the nozzle body, and desuperheating water is jetted downwards in a circular ring shape through the annular runner; a steam cavity and an external steam annular flow channel are arranged between the check block and the middle body. The middle annular steam and the outer annular steam blow away and take away annularly-jetted desuperheating water, mixing of the steam and the desuperheating water is accelerated, the desuperheating effect is improved, and the length of the steam temperature mixing section is shortened.

Description

Technical Field

[0001] The present invention relates to a steam-supported desuperheating pressure reducing valve, which can be used in the steam desuperheating and pressure reducing systems in the power and petrochemical fields. Background Art

[0002] The superheated steam required in the power and petrochemical fields is generally obtained by reducing the pressure and then reducing the temperature of high-temperature and high-pressure steam through a desuperheating and pressure reducing system. At present, in the desuperheating pressure reducing valve, spring nozzles are generally arranged uniformly in the circumferential direction of the valve rear pipeline, and the desuperheating water is sprayed along the vertical direction of the steam flow. In this way, half of the desuperheating water is sprayed in the reverse direction of the steam flow, which is not conducive to the full and uniform mixing of the steam and the desuperheating water, and is prone to water accumulation, resulting in uneven temperature of the steam after desuperheating, or a longer mixing section is required. At the same time, due to water accumulation and uneven mixing temperature, it is extremely easy to cause pipeline bending and damage.

[0003] The present invention provides a steam-supported desuperheating pressure reducing valve, in which a steam-supported nozzle assembly is arranged in the desuperheating cavity on the outlet side. A central steam flow channel is arranged at the center of the steam-supported nozzle assembly, a desuperheating water annular flow channel is arranged on its outer side, and an external steam annular flow channel is arranged outside the desuperheating water annular flow channel. The flow direction of the desuperheating water is the same as that of the steam. Coupled with the high-speed spraying of steam in the inner and outer layers to accelerate the atomization and mixing of the desuperheating water, the steam mixing section is shortened, and pipeline damage is effectively avoided. Summary of the Invention

[0004] The present invention provides a desuperheating pressure reducing valve with excellent steam desuperheating effect, which uses high-pressure steam to carry away and disperse the desuperheating water, so that the steam and the desuperheating water are mixed more evenly and fully, and the service life of the pipeline is effectively improved.

[0005] The technical solution adopted by the present invention is: a steam-supported desuperheating pressure reducing valve, which includes a valve body, a steam-supported nozzle assembly, a desuperheating water pipe, a pressure reducing sleeve, a gland, a valve core, a valve stem, a valve cover, a pressure ring, a sealing ring, a four-piece ring, a bracket, an actuator, and an orifice plate. The valve body and the valve cover are hermetically connected through a sealing ring, a pressure ring, and a four-piece ring, and the valve body and the pressure reducing sleeve are tightly connected through a gland.

[0006] An orifice plate is arranged in the pipeline on the outlet side of the valve. A steam-supported nozzle assembly is arranged at the central part of the orifice plate. The steam-supported nozzle assembly is composed of an orifice plate, a stop block, an intermediate body, and a nozzle body.

[0007] The steam-supported nozzle assembly is communicated with the internal flow channel of the pressure reducing sleeve. A central steam flow channel is arranged at the central part of the steam-supported nozzle assembly; a desuperheating water chamber A and a desuperheating water annular flow channel are arranged between the intermediate body and the nozzle body; a steam chamber and an external steam annular flow channel are arranged between the stop block and the intermediate body. A steam hole A is arranged on the intermediate body, and the steam hole A communicates the steam chamber with the pressure reducing sleeve; a desuperheating water chamber B is arranged between the intermediate body and the orifice plate.

[0008] The valve body is welded and connected to the desuperheating water pipe. A desuperheating water hole A is provided on the throttle orifice plate. The desuperheating water pipe is communicated with the desuperheating water chamber B through the desuperheating water hole A. A desuperheating water hole B is provided on the intermediate body. The desuperheating water chamber B is communicated with the desuperheating water chamber A through the desuperheating water hole B. The desuperheating water in the desuperheating water chamber A is sprayed downward in a circular shape through the desuperheating water annular flow channel.

[0009] The high-pressure steam after being decompressed by the valve core is accelerated and sprayed downward in an umbrella shape through the middle steam flow channel by the decompression sleeve, blown and taken away the annular desuperheating water from the center of the valve body to the outside, accelerating the mixing of steam and desuperheating water, and improving the mixing and desuperheating effect of steam and water.

[0010] At the same time, the high-pressure steam in the decompression sleeve enters the steam chamber through the steam hole A provided on the intermediate body, and then is accelerated and ejected through the external steam annular flow channel, further blowing and taking away the annular desuperheating water, further accelerating the mixing of steam and desuperheating water, improving the mixing and desuperheating effect of steam and water, and shortening the length of the steam mixing temperature section.

[0011] The beneficial effect of the present invention is that the steam-supported desuperheating pressure reducing valve uses the middle steam flow channel and the external steam annular flow channel to introduce high-speed steam, blowing and taking away the annularly sprayed desuperheating water from the middle and the outside respectively, greatly improving the mixing effect of steam and desuperheating water, shortening the length of the steam mixing temperature section, and improving the service life of the pipeline. Description of the Drawings

[0012] Figure 1 is a schematic structural diagram of the steam-supported desuperheating pressure reducing valve;

[0013] Figure 2 is a cross-sectional view of the steam-supported nozzle assembly;

[0014] Figure 3 is a schematic diagram of the medium flow;

[0015] Figure 4 is Figure 3 the enlarged view I of

[0016] Figure 5 is a schematic structural diagram of the throttle orifice plate;

[0017] Figure 6 is a schematic structural diagram of the intermediate body;

[0018] Figure 7 is a schematic structural diagram of the nozzle body;

[0019] Figure 8 is a schematic structural diagram of the stop block.

[0020] In the figure, 1. valve body, 2. steam-supported nozzle assembly, 3. desuperheating water pipe, 4. pressure reducing sleeve, 5. gland, 6. valve core, 7. valve stem, 8. valve cover, 9. pressure ring, 10. sealing ring, 11. four-piece ring, 12. throttle orifice plate, 13. bracket, 14. actuator, 2-1. stop block, 2-2. intermediate body, 2-3. nozzle body Detailed implementation mode

[0021] In Figure 1 In the illustrated embodiment, a steam-supported desuperheating and pressure reducing valve provided by the present invention is composed of a valve body 1, a steam-supported nozzle assembly 2, a desuperheating water pipe 3, a pressure reducing sleeve 4, a gland 5, a valve core 6, a valve stem 7, a valve cover 8, a pressure ring 9, a sealing ring 10, a four-piece ring 11, a throttle orifice plate 12, a bracket 13, and an actuator 14. The valve body 1 and the valve cover 5 are connected through a sealing ring 10, a pressure ring 9, and a four-piece ring 11, and the valve body 1 and the pressure reducing sleeve 4 are tightly connected through a gland 5.

[0022] In Figure 2 In the illustrated embodiment, a throttle orifice plate 12 is arranged in the pipeline on the outlet side of the valve, and a steam-supported nozzle assembly 2 is arranged at the central part of the throttle orifice plate 12. The steam-supported nozzle assembly 2 is composed of a throttle orifice plate 12, a stop block 2-1, an intermediate body 2-2, and a nozzle body 2-3.

[0023] In Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 In the illustrated embodiment, the flow channels of the steam-supported nozzle assembly 2 and the pressure reducing sleeve 4 are communicated. A central steam flow channel is arranged at the center of the steam-supported nozzle assembly 2. A desuperheating water chamber A and a desuperheating water annular flow channel are arranged between the intermediate body 2-2 and the nozzle body 2-3. A steam chamber and an external steam annular flow channel are arranged between the stop block 2-1 and the intermediate body 2-2. A desuperheating water chamber B is arranged between the intermediate body 2-2 and the throttle orifice plate 12.

[0024] The valve body 1 is welded to the desuperheating water pipe 3. The desuperheating water pipe 3 is communicated with the desuperheating water chamber B through a desuperheating water hole A. The desuperheating water chamber B is communicated with the desuperheating water chamber A through a desuperheating water hole B. The desuperheating water in the desuperheating water chamber A is sprayed downward in a circular shape through the desuperheating water annular flow channel.

[0025] The high-pressure steam decompressed by the valve core 6 passes through the pressure reducing sleeve 4 and is sprayed downward in an umbrella shape and accelerated and diverged through the central steam flow channel, blowing and carrying away the annular desuperheating water from the center of the valve body 1 outward, accelerating the mixing of steam and desuperheating water, and improving the mixing and desuperheating effect of steam and water.

[0026] Meanwhile, the high-pressure steam in the pressure-reducing sleeve 4 enters the steam chamber through the steam hole A provided on the intermediate body 2-2, and then is accelerated and ejected by the external steam annular flow channel, further dispersing and carrying away the annular desuperheating water, further accelerating the mixing of the steam and the desuperheating water, improving the steam-water mixing and desuperheating effects, and shortening the length of the steam temperature mixing section.

Claims

1. A steam-supported desuperheating pressure reducing valve, comprising a valve body (1), a steam-supported nozzle assembly (2), a desuperheating water pipe (3), a pressure reducing sleeve (4), a gland (5), a valve core (6), a valve stem (7), a valve cover (8), a pressure ring (9), a sealing ring (10), a four-piece ring (11), an orifice plate (12), a bracket (13), and an actuator (14), characterized in that: The valve body (1) and the valve cover (8) are connected by a sealing ring (10), a compression ring (9), and a four-piece ring (11). The valve body (1) and the pressure reducing sleeve (4) are tightly connected by a gland (5). A steam-supported nozzle assembly (2) is provided on the outlet side of the valve. The steam-supported nozzle assembly (2) consists of an orifice plate (12), a stop block (2-1), an intermediate body (2-2), and a nozzle body (2-3). The steam-supported nozzle assembly (2) is in communication with the pressure reducing sleeve (4). A central steam flow passage is provided in the center of the steam-supported nozzle assembly (2). A desuperheating water chamber A and a desuperheating water annular flow passage are provided between the intermediate body (2-2) and the nozzle body (2-3). A steam chamber and an external steam annular flow passage are provided between the stop block (2-1) and the intermediate body (2-2). A desuperheating water chamber B is provided between the intermediate body (2-2) and the orifice plate (12).

2. The steam-supported desuperheating pressure reducing valve according to claim 1, characterized in that: Desuperheating water holes A are provided on the orifice plate (12). The desuperheating water pipe (3) is in communication with the desuperheating water chamber B through the desuperheating water holes A. Desuperheating water holes B are provided on the intermediate body (2-2). The desuperheating water chamber B is in communication with the desuperheating water chamber A through the desuperheating water holes B.

3. The steam-supported desuperheating pressure reducing valve according to claim 1, characterized in that: Steam holes A are provided on the intermediate body (2-2). The steam holes A connect the steam chamber with the pressure reducing sleeve (4).

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