WO2023098139A1

WO2023098139A1 - Medium-pressure regulating valve for use in steam turbine with function of continuously adjusting steam flow

Info

Publication number: WO2023098139A1
Application number: PCT/CN2022/111664
Authority: WO
Inventors: 王洪鹏; 马晓辉; 张雪; 张金春; 周新灵; 李涛; 袁晶晶; 肖慧敏; 张志伟; 张洋洋; 孙波; 何成君
Original assignee: 哈尔滨汽轮机厂有限责任公司
Priority date: 2021-12-03
Filing date: 2022-08-11
Publication date: 2023-06-08
Also published as: CN114278396A

Abstract

A medium-pressure regulating valve for use in a steam turbine with the function of continuously adjusting steam flow, relating to a medium-pressure regulating valve for use in a steam turbine. The present invention solves the problems of vibration and loud noise when existing medium-pressure regulating valves of a steam turbine are opened slightly. In the present invention, a steam filter is installed within a valve housing, a regulating valve guide sleeve is installed within the valve housing, and a regulating valve stem is vertically slidably installed on a valve cover and extends into the valve housing. A large regulating valve disc is installed at the lower end of the valve stem, and the large regulator valve disc has a sliding fit with the inner side wall of the regulating valve guide sleeve. A main steam valve guide sleeve is installed in the valve housing, and the main steam valve stem is vertically slidably installed in a main steam valve guide sleeve. A valve seat is installed in the valve housing, and the valve seat is located at the lower end of the steam filter. A small regulating valve disc is installed at the upper end of a main steam valve stem. A main steam valve disc is installed on the small regulating valve disc, and a small regulating valve cover is installed directly above the small regulating valve disc. The present invention is used in a steam turbine.

Description

A medium-pressure regulating valve for steam turbines with the function of continuously regulating steam flow

technical field

The invention relates to a medium-pressure regulating valve for a steam turbine, in particular to a medium-pressure regulating valve for a steam turbine with the function of continuously regulating steam flow.

Background technique

For steam turbines that use reheat steam to supply heat to the outside, in order to ensure the stability of the steam supply pressure, the reheat steam pressure in front of the valve must be adjusted through the medium pressure regulating valve. When the external steam supply flow increases significantly, or when the load of the steam turbine decreases a lot, the reheat steam pressure decreases, and the medium pressure regulating valve of the steam turbine can only realize the setting of the pre-valve pressure by excessively reducing the opening. If the valve opening is too small, the reheated steam flowing through the valve will be severely throttled, and problems of valve vibration and high noise will inevitably occur, which seriously restricts the external heat supply capacity of the steam turbine.

Therefore, the existing steam turbine medium pressure regulating valve has problems of vibration and high noise at a small opening.

Contents of the invention

The purpose of the present invention is to solve the problem of vibration and high noise in the existing steam turbine medium pressure regulating valve with a small opening, and further provide a steam turbine medium pressure regulating valve with the function of continuously adjusting the steam flow.

Technical scheme of the present invention is:

A medium-pressure regulating valve for steam turbines with the function of continuously regulating the steam flow, including a valve cover and a valve bottom, the valve cover and the valve bottom are respectively installed on the upper end surface and the lower end surface of the valve casing, and it also includes a regulating valve stem, a steam Filter screen, regulating valve guide sleeve, large regulating valve disc, small regulating valve cover, valve seat, main steam valve disc, small regulating valve disc, main steam valve stem and main steam valve guiding sleeve, the steam filter is installed on the valve Inside the casing, and the steam filter is opposite to the steam inlet, the regulating valve guide sleeve is installed in the valve casing, and the upper end of the regulating valve guiding sleeve is connected with the valve cover, and the regulating valve stem is vertically slid and installed on the valve cover and extends into the Into the valve casing, the large regulating valve disc is installed at the lower end of the regulating valve stem, and the large regulating valve disc is slidingly matched with the inner wall of the regulating valve guide sleeve, the main steam valve guiding sleeve is installed in the valve housing, and the main steam valve The guide sleeve is installed on the valve bottom, the main steam valve stem is vertically slid and installed in the guide sleeve of the main steam valve, the valve seat is installed in the valve housing, and the valve seat is located at the lower end of the steam filter, and the small regulating valve disc is installed in the The upper end of the main steam valve stem, the main steam valve disc is installed on the small regulating valve disc, and the main steam valve disc is located in the large regulating valve disc and cooperates with the valve seat, and the small regulating valve cover is installed directly above the small regulating valve disc.

Further, the upper end of the steam filter is connected to the valve cover, and the upper end of the steam filter is installed on the valve housing.

Further, the small regulating valve disc is connected with the main steam valve stem in a threaded manner.

Further, sealing and positioning are formed between the main steam valve disc and the valve seat.

Further, sealing and positioning are formed between the large regulating valve disc and the valve seat.

Further, the large regulating valve disc is a hollow cylindrical valve disc.

Further, the small regulating valve disc is a cylindrical valve disc with a flow control hole and a sound-absorbing hole.

Preferably, the sound-absorbing holes of the small regulating valve disc are densely arranged small holes with special arrangement rules.

Further, the inner diameter of the guide sleeve of the regulating valve is a variable diameter, and the variable diameter is divided into two stages of diameter reduction, which are successively reduced from bottom to top.

Furthermore, it also includes a stepped sleeve, which is located in the valve casing, and the stepped sleeve is installed on the lower end surface of the valve cover, the regulating valve stem passes through the stepped sleeve, and the upper part of the large regulating valve disc is slidably matched with the outside of the stepped sleeve.

Compared with the prior art, the present invention has the following effects:

The present invention is used for the medium-pressure regulating valve of the steam turbine to adjust the reheating steam pressure, through the mutual switching between the large regulating valve and the small regulating valve, the regulating valve can realize continuous steam pressure regulation and steam flow under various opening degrees Adjustment, and thoroughly solve the vibration problem and high noise problem of the valve at a small opening, so that the steam turbine has the ability to provide reheated steam with stable pressure to the outside.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention, and all valves are all in closed state in the illustration;

Figure 2 is a schematic diagram of the large regulating valve fully open and the small regulating valve in the regulating state;

Fig. 3 is a schematic diagram of the small regulating valve and the main steam valve being fully opened, and the large regulating valve being in a regulating state.

Detailed ways

Specific embodiment one: This embodiment is described in conjunction with Fig. 1-Fig. 3, and this embodiment comprises valve cover 1 and valve bottom 13, and valve cover 1 and valve bottom 13 are installed on the upper end surface and the lower end surface of valve shell 3 respectively, It also includes regulating valve stem 2, steam filter 4, regulating valve guide sleeve 5, large regulating valve disc 6, small regulating valve cover 7, valve seat 8, main steam valve disc 9, small regulating valve disc 10, main steam Valve stem 11 and main steam valve guide sleeve 12,

The steam filter 4 is installed in the valve housing 3, and the steam filter 4 is opposite to the steam inlet, the regulating valve guide sleeve 5 is installed in the valve housing 3, and the upper end of the regulating valve guide sleeve 5 is connected with the valve cover 1, and the adjustment The valve stem 2 is vertically slidably installed on the valve cover 1 and extends into the valve casing 3. The large regulating valve disc 6 is installed at the lower end of the regulating valve stem 2, and the large regulating valve disc 6 is connected to the inner side of the regulating valve guide sleeve 5. wall sliding fit,

The main steam valve guide sleeve 12 is installed in the valve housing 3, and the main steam valve guide sleeve 12 is installed on the valve bottom 13, the main steam valve stem 11 is vertically slid and installed in the main steam valve guide sleeve 12, and the valve seat 8 is installed in the valve casing 3, and the valve seat 8 is located at the lower end of the steam filter 4, the small regulating valve disc 10 is installed on the upper end of the main steam valve stem 11, and the main steam valve disc 9 is installed on the small regulating valve disc 10, and The main steam valve disc 9 is located in the large regulating valve disc 6 and cooperates with the valve seat 8, and the small regulating valve cover 7 is installed directly above the small regulating valve disc 10.

The steam turbine medium pressure regulating valve of the present invention can continuously adjust steam pressure and steam flow at various openings, solve the problem of vibration and high noise of the valve at small openings, and meet the requirements of the steam turbine to provide stable pressure reheating Steam on request.

Embodiment 2: This embodiment is described with reference to FIGS. 1-3 . The upper end of the steam filter 4 in this embodiment is connected to the valve cover 1 , and the upper end of the steam filter 4 is installed on the valve housing 3 . So arranged, it is convenient to provide filtration for incoming steam. Other compositions and connections are the same as in the first embodiment.

Embodiment 3: This embodiment is described with reference to FIGS. 1-3 . In this embodiment, the small regulating valve disc 10 and the main steam valve stem 11 are connected by threads. With such arrangement, the connection method is simple, and the disassembly and maintenance are convenient. Other compositions and connections are the same as those in Embodiment 1 or Embodiment 2.

Embodiment 4: This embodiment is described with reference to FIGS. 1-3 . In this embodiment, the main steam valve disc 9 and the valve seat 8 are sealed and positioned. Such setting is convenient to ensure the effect of opening and closing the valve, especially when the valve needs to be closed, the sealing state can ensure the closing effect of the valve. Other compositions and connections are the same as those in Embodiment 1 or Embodiment 2.

Embodiment 5: This embodiment is described with reference to FIGS. 1-3 . In this embodiment, a seal and positioning are formed between the large regulating valve disc 6 and the valve seat 8 . Such setting is convenient to ensure the opening and closing effect of the valve. Other compositions and connections are the same as those in

Embodiment

1, 2, 3 or 4.

Embodiment 6: This embodiment is described with reference to FIGS. 1-3 . The large regulating valve disc 6 of this embodiment is a hollow cylindrical valve disc. With such arrangement, the hollow part is convenient for embedding the main steam valve disc 9, thereby ensuring mutual switching of different opening degrees. Other compositions and connections are the same as those in

Embodiment

1, 2, 3, 4 or 5.

Embodiment 7: This embodiment is described with reference to FIGS. 1-3 . The small regulating valve disc 10 of this embodiment is a cylindrical valve disc with a flow control hole and a sound-absorbing hole 10 - 1 . Such setting, the sound-absorbing hole 10-1 is convenient to reduce the problem of noise generated during the opening process of the valve, and the flow control hole can adjust the flow rate according to the actual situation. Other compositions and connections are the same as those in

Embodiment

1, 2, 3, 4, 5 or 6.

Embodiment 8: This embodiment will be described with reference to FIGS. 1-3 . The silencer holes 10 - 1 of the small regulating valve disc 10 in this embodiment are densely arranged small holes with special arrangement rules. Such setting enables the small hole to linearly adjust the steam flow while having the sound-absorbing function. Other compositions and connections are the same as any one of the specific embodiments 1 to 7.

Embodiment 9: This embodiment will be described with reference to Figures 1-3. The inner diameter of the regulating valve guide sleeve 5 in this embodiment is a variable diameter, and the variable diameter is divided into two stages of diameter reduction, which are sequentially reduced from bottom to top. Such setting can make the large regulating valve disc 6 have the function of incomplete unloading, and improve the stability of the large regulating valve disc 6 under the working opening. Other compositions and connections are the same as any one of the specific embodiments 1 to 8.

Embodiment 10: This embodiment is described in conjunction with Fig. 1-Fig. 3, this embodiment also includes a step sleeve 14, the step sleeve 14 is located in the valve housing 3, and the step sleeve 14 is installed on the lower end surface of the valve cover 1 to adjust the valve stem 2 Through the stepped sleeve 14, the positioning shoulder on the adjustment valve stem relies on the positioning ring in the stepped sleeve 14 to limit the maximum stroke. Such arrangement can guide the regulating valve rod 2 and limit the position of the large regulating valve disc 6 . Other compositions and connections are the same as any one of the specific embodiments 1 to 9.

The working principle of the present invention is illustrated in conjunction with Fig. 1 to Fig. 3:

The working implementation of the valve is described in conjunction with Fig. 1: the regulating valve rod 2 of the present invention is connected and fixed with the large regulating valve disc 6, and slides freely along the axial direction in the regulating valve guide sleeve 5; the small regulating valve disc 10 is connected with the small regulating valve cover 7 are threadedly connected and assembled inside the main steam valve disc 9; the main steam valve stem 11 and the small regulating valve disc 10 are fixed through threaded connection, and the main steam valve stem 11 is free along the axial direction in the main steam valve guide sleeve 12. Sliding, and drives the small regulating valve disc 10 and the small regulating valve cover 7 to make a linear motion; the small regulating valve cover 7 and the main steam valve disc 9 form a seal and position; the main steam valve disc 9 and the valve seat 8 form a seal and positioning; sealing and positioning are formed between the large regulating valve disc 6 and the valve seat 8.

The large regulating valve disc 6 is a hollow cylindrical structure. When the valve disc moves downward, it is in the closed position when it is in contact with the valve seat 8. When the valve disc moves upward, it means that the valve is opening. To adjust the shoulder of the valve stem 2 When it is in contact with the positioning surface of the valve cover 1, it is the maximum open position of the valve, and the large regulating valve disc 6 can control the steam flow at any position between the closed position and the maximum open position.

The small regulating valve disc 10 is a cylindrical structure with a flow control hole and a sound-absorbing hole 10-1. When the valve disc moves upwards, the small regulating valve begins to open, and when the shoulder slope of the small regulating valve disc 10 contacts the slope of the main steam valve disc 9, the small regulating valve disc 10 reaches the maximum open position. The downward movement of the small regulating valve disc 10 is the closing direction of the valve. When the sealing surface of the small regulating valve cover 7 is in contact with the sealing surface of the main steam valve disc 9, the small regulating valve disc 10 reaches the closed position.

Combined with Figure 2 and Figure 3, the working implementation of the valve is explained: when the medium pressure regulating valve adjusts the reheat steam pressure, if the amount of steam extracted before the valve is large or the load of the steam turbine is low, the steam pressure before the valve will also become lower. To make the steam pressure in front of the valve reach the required value, the steam pressure in front of the valve can be increased by reducing the steam flow rate entering the steam turbine, which can be adjusted with a small regulating valve disc 10, as shown in Figure 2. At this time, the large regulating valve disc 6 is opened to the maximum opening degree, and the main steam valve disc 9 is closed on the valve seat 8. By adjusting the opening degree of the small regulating valve disc 10, the steam flow through the valve and entering the steam turbine is controlled, and at the same time, the The purpose of adjusting the steam pressure before the valve. When the steam flows through the silencer hole 10-1 of the small regulating valve disc 10, it can not only realize the control of the steam flow rate but also eliminate the high noise generated by the steam flow, and weaken the shock wave and component vibration caused by the steam injection. The small regulating valve disc 10 can work in any opening.

When the amount of steam extracted in front of the valve is small or the load of the steam turbine is high, the steam pressure in front of the valve is also high, and the large regulating valve disc 6 can be used to adjust the steam pressure. At this time, the main steam valve disc 9 and the small regulating valve disc 10 are both at the maximum opening position, and placed in the inner cavity of the large regulating valve disc 6, and the flow through the valve is controlled by adjusting the opening of the large regulating valve disc 6. Steam flow rate, while achieving the purpose of adjusting the steam pressure before the valve. The flow characteristic of the large regulating valve disc 6 determines that the valve can only be adjusted at an opening of more than 20%. If the valve needs to be further closed, it needs to be switched to a small regulating valve to realize flow and pressure regulation.

The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be described in the foregoing embodiments Modifications are made to the recorded technical solutions, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

A medium-pressure regulating valve for steam turbines with the function of continuously adjusting steam flow, which includes a valve cover (1) and a valve bottom (13), and the valve cover (1) and valve bottom (13) are respectively mounted on a valve casing (3) The upper end face and the lower end face, it is characterized in that: it also includes regulating valve stem (2), steam strainer (4), regulating valve guiding sleeve (5), large regulating valve disc (6), small regulating valve cover (7), valve seat (8), main steam valve disc (9), small regulating valve disc (10), main steam valve stem (11) and main steam valve guide sleeve (12),

The steam filter (4) is installed in the valve housing (3), and the steam filter (4) is opposite to the steam inlet, the regulating valve guide sleeve (5) is installed in the valve housing (3), and the regulating valve guide sleeve The upper end of (5) is connected with the bonnet (1), the regulating valve rod (2) is vertically slid and installed on the bonnet (1) and extends into the valve casing (3), and the large regulating valve disc (6) is installed on Adjust the lower end of the valve stem (2), and the large regulating valve disc (6) slides with the inner side wall of the regulating valve guide sleeve (5),

The main steam valve guide sleeve (12) is installed in the valve casing (3), and the main steam valve guide sleeve (12) is installed on the valve bottom (13), and the main steam valve stem (11) is vertically slid and installed on the main In the guide sleeve (12) of the steam valve, the valve seat (8) is installed in the valve casing (3), and the valve seat (8) is located at the lower end of the steam filter (4), and the small regulating valve disc (10) is installed in the main The upper end of the steam valve rod (11), the main steam valve disc (9) is installed on the small regulating valve disc (10), and the main steam valve disc (9) is located in the large regulating valve disc (6) and is connected with the valve seat (8 ) to cooperate, the small regulating valve cover (7) is installed directly above the small regulating valve disc (10).
A medium-pressure regulating valve for steam turbines with the function of continuously regulating steam flow according to claim 1, characterized in that: the upper end of the steam filter (4) is connected to the valve cover (1), and the steam filter (4) The upper end is installed on the valve casing (3).
A steam turbine medium-pressure regulating valve with the function of continuously regulating steam flow according to claim 2, characterized in that: the small regulating valve disc (10) and the main steam valve stem (11) are connected by threads.
According to claim 1 or 3, a steam turbine medium-pressure regulating valve with the function of continuously regulating the steam flow is characterized in that: the main steam valve disc (9) and the valve seat (8) are sealed and positioned.
A steam turbine medium-pressure regulating valve with the function of continuously regulating steam flow according to claim 4, characterized in that: the large regulating valve disc (6) and the valve seat (8) form a seal and position.
A steam turbine medium-pressure regulating valve with the function of continuously regulating steam flow according to claim 5, characterized in that: the large regulating valve disc (6) is a hollow cylindrical valve disc.
A medium-pressure regulating valve for steam turbines with the function of continuously regulating steam flow according to claim 6, characterized in that: the small regulating valve disc (10) is a cylinder with a flow control hole and a sound-absorbing hole (10-1) shaped disc.
A steam turbine medium-pressure regulating valve with the function of continuously regulating steam flow according to claim 7, characterized in that: the sound-absorbing holes (10-1) of the small regulating valve disc (10) are dense holes.
A medium-pressure regulating valve for steam turbines with the function of continuously regulating steam flow according to claim 1, characterized in that: the inner diameter of the regulating valve guide sleeve (5) is a variable diameter, and the variable diameter is divided into two stages Variable diameter, shrinking sequentially from bottom to top.
A medium-pressure regulating valve for steam turbines with the function of continuously regulating steam flow according to claim 9, characterized in that it also includes a stepped sleeve (14), and the stepped sleeve (14) is located in the valve housing (3), and The stepped sleeve (14) is installed on the lower end surface of the bonnet (1), the adjusting valve stem (2) passes through the stepped sleeve (14), and the positioning shoulder on the adjusting valve stem is limited by the positioning ring in the stepped sleeve (14). Maximum stroke.