KR20240017250A - Flushing device for main control valve of turbine - Google Patents

Abstract

In an embodiment of the present invention, a flushing device for a main control valve of a turbine includes a flushing block that is in communication with the main control valve and has a plurality of flow paths formed therein; an operating valve coupled to the flushing block to open and close the flow path or to form a flow path between a plurality of ports; And it may include a handle coupled to the operation valve to change the mode of the operation valve.
According to an embodiment of the present invention, each part of the main control valve of the turbine can be effectively flushed, thereby preventing contamination of the main control valve.

Description

Flushing device for main control valve of turbine}

Embodiments of the present invention relate to a flushing device for a main control valve of a turbine.

In general, a steam turbine is a device that converts the thermal energy of high-temperature, high-pressure steam generated in a boiler such as a thermal power plant into kinetic energy. The driving system of a steam turbine uses various valves and structures, including the main control valve.

The flushing process is a process that removes foreign substances inside pipes and various parts and lubricates them by adding a melting agent. The conventional flushing process does not include flushing inside the main control valve of the steam turbine, causing problems such as malfunction and damage to the main control valve due to contamination of the control oil.

The above-described information disclosed in the background technology of this invention is only for improving understanding of the background of the present invention, and therefore may include information that does not constitute prior art.

An embodiment of the present invention is to provide a flushing device for a main control valve of a turbine.

A flushing device for a main control valve of a turbine according to an embodiment of the present invention includes a flushing block that is in communication with the main control valve and has a plurality of flow paths formed therein; an operating valve coupled to the flushing block to open and close the flow path or to form a flow path between a plurality of ports; And it may include a handle coupled to the operation valve to change the mode of the operation valve.

The operating valve is characterized in that it forms flow paths between different ports within the flushing block in a flushing mode, an open mode in which the oil flow path in the main control valve is opened, and a closed mode in which the oil flow path in the main control valve is closed.

The pressure of control oil in the flushing mode is characterized by 1600 Psig.

It is characterized in that the oil passage in the main control valve is flushed according to the mode of the operation valve.

According to an embodiment of the present invention, each part of the main control valve of the turbine can be effectively flushed, thereby preventing contamination of the main control valve.

Figure 1 is a schematic diagram showing a flushing device and oil flow according to an embodiment of the present invention.
Figures 2a and 2b are diagrams showing the exterior and interior of the servo valve flushing block for the MSV main control valve.
FIG. 3 is a diagram showing the operating position of the flushing block operation valve according to FIGS. 2A and 2B.
FIG. 4 is a diagram illustrating the states of each operating position according to the operation valve of FIG. 3.
Figures 5a and 5b are diagrams showing the exterior and interior of the fast-acting solenoid valve flushing block for the MSV main control valve.
Figures 6a and 6b are diagrams showing the exterior and interior of a test solenoid valve flushing block for the MSV main control valve.
Figures 7a and 7b are diagrams showing the exterior and interior of the servo valve flushing block for the RSV intermediate main control valve.
Figures 8a and 8b are diagrams showing the exterior and interior of the solenoid valve flushing block for the RSV intermediate main control valve.

The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art, and the following examples may be modified into various other forms, and the scope of the present invention is as follows. It is not limited to the examples. Rather, these embodiments are provided to make the disclosure more faithful and complete, and to fully convey the spirit of the invention to those skilled in the art.

In addition, in the drawings below, the thickness and size of each layer are exaggerated for convenience and clarity of explanation, and the same symbols refer to the same elements in the drawings. As used herein, the term “and/or” includes any one and all combinations of one or more of the listed items. In addition, the meaning of "connected" in this specification refers not only to the case where member A and member B are directly connected, but also to the case where member C is interposed between member A and member B to indirectly connect member A and member B. do.

The terms used herein are used to describe specific embodiments and are not intended to limit the invention. As used herein, the singular forms include the plural forms unless the context clearly indicates otherwise. Additionally, when used herein, “comprise, include,” and/or “comprising, including” refer to mentioned features, numbers, steps, operations, members, elements, and/or groups thereof. It specifies the presence and does not exclude the presence or addition of one or more other shapes, numbers, movements, members, elements and/or groups.

Although the terms first, second, etc. are used herein to describe various members, parts, regions, layers and/or parts, these members, parts, regions, layers and/or parts are limited by these terms. It is obvious that this cannot be done. These terms are used only to distinguish one member, component, region, layer or section from another region, layer or section. Accordingly, a first member, component, region, layer or portion described below may refer to a second member, component, region, layer or portion without departing from the teachings of the present invention.

Space-related terms such as “beneath,” “below,” “lower,” “above,” and “upper” are used to refer to an element or feature shown in a drawing. It can be used to facilitate understanding of other elements or features. These space-related terms are for easy understanding of the present invention according to various process states or usage states of the present invention, and are not intended to limit the present invention. For example, if an element or feature in a drawing is turned over, an element or feature described as “bottom” or “below” becomes “top” or “above.” Therefore, “lower” is a concept encompassing “upper” or “lower.”

Hereinafter, a flushing device for a main control valve of a turbine according to an embodiment of the present invention will be described in detail with reference to the attached drawings.

Figure 1 is a schematic diagram showing a flushing device and oil flow according to an embodiment of the present invention.

As shown in FIG. 1, the flushing device 30 according to an embodiment of the present invention may be installed adjacent to the main control valve 10 of a turbine of a 1000 MW coal-fired power plant, for example. For example, the main control valve (CV) or the intermediate control valve (ICV) may include a plurality of valves such as a servo valve, a fast acting solenoid valve, and a test solenoid valve. The flushing device 30 is installed to separate the aforementioned valves from the main control valve 10 and replace them, and is a device that performs the flushing function and the functions of the aforementioned valves. The flushing device 30 may include an operation valve 32 for changing the flushing mode, a handle 34 for the operation valve 32, and a flushing block 36 in communication with the main control valve 10.

The operating valve 32 connects the flow path inside the flushing block 36 to open, close, or change the flow path depending on the position of the handle 34. A handle 34 is coupled to the operating valve 32, and flushing mode, flow path opening mode (open mode), and flow path closing mode (closed mode) can be selected depending on the position of the handle 34 (this will be described later) ).

The flushing block 36 is provided with a plurality of flow paths inside, and is provided with parts such as actuators to open and close the flow paths. The flushing block 36 can selectively open and close one of the plurality of flow paths in conjunction with the operation of the handle 34. Accordingly, the functions of various valves installed in the main control valve or intermediate main control valve can be replaced. The flushing block 36 is in communication with the main control valve 10 and becomes part of the oil passage. To this end, the flushing block 36 may be provided in a polyhedral shape roughly similar to a box shape. However, the flushing block 36 is not limited to the shape described above.

Control oil may be supplied to the main control valve 10 by the control oil pump 70 from the control oil tank 50 in which the control oil is stored. This line is called the control oil supply line and is shown as a dotted line in Figure 1. If the flushing block 36 is not closed, control oil may be supplied to the main control valve 10 through the flushing block 36.

Additionally, a trip oil line and a drain oil line may be connected to the main control valve 10. The trip oil line is a line shown as a solid line in FIG. 1, which branches off from the control oil supply line through which control oil is supplied by the control oil pump 70, passes through the flushing block 36, and can be supplied to the main control valve 10. there is.

The drain oil line is a line shown as a two-dot chain line in FIG. 1 and is an oil line for discharging control oil from the main control valve 10 and sending it back to the control oil tank 50.

Exemplarily, the flushing device 30 first flushes the trip oil line (ETS flushing) and secondarily flushes the control oil supply line (FAS flushing) in the flushing process of the main control valve 10. In addition, after flushing the above-mentioned two oil lines inside the main control valve 10 in a third way, the drain line can be flushed in a fourth way and returned to the control oil tank 50.

Hereinafter, various embodiments of the flushing device installed in each valve will be described.

Figures 2a and 2b are diagrams showing the exterior and interior of the servo valve flushing block for the MSV main control valve. FIG. 3 is a diagram showing the operating position of the flushing block operation valve according to FIGS. 2A and 2B. FIG. 4 is a diagram illustrating the states of each operating position according to the operation valve of FIG. 3.

Figure 2a shows the exterior of the flushing block 36 installed to replace the servo valve for the MSV (Major Stop Valve) main control valve, and Figure 2b shows the inside of the flushing block 36. The flushing block 36 can be installed in the corresponding position after removing the servo valve. A, B, P, and T shown on the outside of the flushing block 36 indicate the positions of the A port, B port, P port, and T port inside, respectively. The internal ports of the flushing block 36 are each connected to an internal flow path. On the outside of the flushing block 36, only the location of each port is indicated, and the through hole is not exposed. The plate surface on which each port of the flushing block 36 is shown is a coupling surface 362 that is coupled to the body of the main control valve (the position where the servo valve is separated). The operating valve 32 is coupled to a hole shown on a surface other than the coupling surface 362 and is connected to the above-described A port, B port, P port, and T port.

As shown in FIG. 3, after the operation valve 32 is connected to the flushing block, the flushing mode is defined as when the handle 34 is in the flushing position. When the handle 34 is in the open position, it is defined as open mode, and when it is in the close position, it is defined as close mode.

Illustratively, the pressure of control oil in flushing mode may be set to 1600 Psig (approximately 110 bar).

As an example, it can be set to open mode during the first ETS flushing. At this time, based on FIG. 4, a flow path may be formed between the P port and the A port, and a flow path may be formed between the T port and the B port. Accordingly, the trip oil line can be flushed.

As an example, the flushing mode can be set during secondary FAS flushing. At this time, a flow path is formed between the P port and the T port based on FIG. 4, and the control oil supply line can be flushed accordingly.

As an example, it can be set to closed mode during the 3rd Actuator Open Test & Internal flushing. At this time, based on FIG. 4, a flow path may be formed between the P port and the B port, and a flow path may be formed between the T port and the A port. Accordingly, the drain line is closed so that the oil lines inside the servo valve can be flushed.

As an example, it can be set to open mode during the 4th Actuator Close Test & Internal flushing. At this time, based on FIG. 4, a flow path may be formed between the P port and the A port, and a flow path may be formed between the T port and the B port. Accordingly, the oil inside the servo valve can be drained and the drain line can be flushed.

Figures 5a and 5b are diagrams showing the exterior and interior of the fast-acting solenoid valve flushing block for the MSV main control valve.

Figure 5a shows the exterior of the flushing block 36a installed to replace the fast-acting solenoid valve for the MSV main control valve, and Figure 5b shows the inside of the flushing block 36a. A, B, P, and T shown on the inner surface 364a of the flushing block 36a indicate the positions of the A port, B port, P port, and T port on the inner surface 362a, respectively. The internal ports of the flushing block 36a are each connected to an internal flow path.

The plate surface on which each port of the flushing block (36a) is shown is a coupling surface (362a) that is coupled to the position where the fast acting solenoid valve is separated. The operating valve is coupled to a surface other than the coupling surface 362a and connected to the above-described A port, B port, P port, and T port (the structure of the operating valve can be configured the same as the embodiment of FIGS. 3 and 4 (so detailed explanation is omitted).

Illustratively, the pressure of control oil in flushing mode may be set to 1600 Psig (approximately 110 bar).

As an example, it can be set to open mode during the first ETS flushing. At this time, a flow path may be formed between the P port and the T port. Accordingly, the trip oil line can be flushed.

As an example, the flushing mode can be set during secondary FAS flushing. At this time, a flow path may be formed between the P port and the B port, and a flow path may be formed between the T port and the A port. Accordingly, the control oil supply line can be flushed.

As an example, it can be set to closed mode during the 3rd Actuator Open Test & Internal flushing. At this time, a flow path may be formed between the P port and the B port, and a flow path may be formed between the T port and the A port. Accordingly, the drain line is closed so that the oil lines inside the fast-acting solenoid valve can be flushed.

As an example, it can be set to open mode during the 4th Actuator Close Test & Internal flushing. At this time, a flow path may be formed between the P port and the B port, and a flow path may be formed between the T port and the A port. Accordingly, the oil inside the fast-acting solenoid valve can be drained and the drain line can be flushed.

Figures 6a and 6b are diagrams showing the exterior and interior of a test solenoid valve flushing block for the MSV main control valve.

Figure 6a shows the exterior of the flushing block 36b installed to replace the test solenoid valve for the MSV main control valve, and Figure 6b shows the inside of the flushing block 36b. A, B, P, and T shown on the external surface 364a of the flushing block 36b indicate the positions of the internal A port, B port, P port, and T port, respectively. The internal ports of the flushing block 36b are each connected to an internal flow path.

The plate surface on which each port of the flushing block 36b is shown is a coupling surface 362b that is coupled to the position where the test solenoid valve is separated. The operating valve is coupled to a surface other than the coupling surface 362b and connected to the above-described A port, B port, P port, and T port (the structure of the operating valve can be configured the same as the embodiment of FIGS. 3 and 4). (so detailed explanation is omitted).

Illustratively, the pressure of control oil in flushing mode may be set to 1600 Psig (approximately 110 bar).

As an example, it can be set to open mode during the first ETS flushing. At this time, a flow path may be formed between the P port and the A port, and a flow path may be formed between the T port and the B port. Accordingly, the trip oil line can be flushed.

As an example, the flushing mode can be set during secondary FAS flushing. At this time, a flow path may be formed between the P port and the T port. Accordingly, the control oil supply line can be flushed.

As an example, it can be set to closed mode during the 3rd Actuator Open Test & Internal flushing. At this time, a flow path may be formed between the P port and the B port, and a flow path may be formed between the T port and the A port. Accordingly, the drain line is closed so that the oil lines inside the test solenoid valve can be flushed.

As an example, it can be set to open mode during the 4th Actuator Close Test & Internal flushing. At this time, a flow path may be formed between the P port and the A port, and a flow path may be formed between the T port and the B port. Accordingly, the oil inside the test solenoid valve can be drained and the drain line can be flushed.

Figures 7a and 7b are diagrams showing the exterior and interior of the servo valve flushing block for the RSV main control valve.

Figure 7a shows the exterior of the flushing block 36c installed to replace the servo valve for the RSV main control valve (ICB), and Figure 7b shows the inside of the flushing block 36c. A, B, P, and T shown on the outer surface 364c of the flushing block 36c indicate the positions of the inner A port, B port, P port, and T port, respectively. The internal ports of the flushing block 36c are each connected to an internal flow path.

The plate surface on which each port of the flushing block 36c is shown is a coupling surface 362c that is coupled to the position where the servo valve is separated. The operating valve is coupled to a surface other than the coupling surface 362c and connected to the above-described A port, B port, P port, and T port (the structure of the operating valve can be configured the same as the embodiment of FIGS. 3 and 4). (so detailed explanation is omitted).

Illustratively, the pressure of control oil in flushing mode may be set to 1600 Psig (approximately 110 bar).

As an example, it can be set to open mode during the first ETS flushing. At this time, a flow path may be formed between the P port and the A port, and a flow path may be formed between the T port and the B port. Accordingly, the trip oil line can be flushed.

As an example, the flushing mode can be set during secondary FAS flushing. At this time, a flow path may be formed between the P port and the T port. Accordingly, the control oil supply line can be flushed.

As an example, it can be set to closed mode during the 3rd Actuator Open Test & Internal flushing. At this time, a flow path may be formed between the P port and the A port, and a flow path may be formed between the T port and the B port. Accordingly, the drain line is closed so that the oil lines inside the servo valve can be flushed.

As an example, it can be set to open mode during the 4th Actuator Close Test & Internal flushing. At this time, a flow path may be formed between the P port and the B port, and a flow path may be formed between the T port and the A port. Accordingly, the oil inside the servo valve can be drained and the drain line can be flushed.

Figures 8a and 8b are diagrams showing the exterior and interior of the solenoid valve flushing block for the RSV main control valve.

Figure 8a shows the exterior of the flushing block 36d installed to replace the test solenoid valve for the RSV main control valve, and Figure 8b shows the inside of the flushing block 36d. A, B, P, and T shown on the outer surface 364d of the flushing block 36d indicate the positions of the inner A port, B port, P port, and T port, respectively. The internal ports of the flushing block 36d are each connected to an internal flow path.

The plate surface on which each port of the flushing block 36d is shown is a coupling surface 362d that is coupled to the position where the test solenoid valve is separated. The operating valve is coupled to a surface other than the coupling surface 362d and connected to the above-described A port, B port, P port, and T port (the structure of the operating valve can be configured the same as the embodiment of FIGS. 3 and 4). (so detailed explanation is omitted).

Illustratively, the pressure of control oil in flushing mode may be set to 1600 Psig (approximately 110 bar).

Illustratively, during primary ETS flushing, the test solenoid valve may be set to open mode. At this time, a flow path may be formed between the P port and the A port, and a flow path may be formed between the T port and the B port. Additionally, the fast-acting solenoid valve can be set to flushing mode. At this time, a flow path may be formed between the P port and the T port. Accordingly, the trip oil line can be flushed.

Illustratively, during secondary FAS flushing, the test solenoid valve may be set to flushing mode. At this time, a flow path may be formed between the P port and the T port. Additionally, the fast-acting solenoid valve can be set to open mode. At this time, a flow path may be formed between the P port and the A port, and a flow path may be formed between the T port and the B port. Accordingly, the control oil supply line can be flushed.

For example, during the 3rd Actuator Open Test & Internal flushing, the test solenoid valve can be set to open mode. At this time, a flow path may be formed between the P port and the A port, and a flow path may be formed between the T port and the B port. Additionally, the fast-acting solenoid valve can also be set to open mode. At this time, a flow path may be formed between the P port and the A port, and a flow path may be formed between the T port and the B port. Accordingly, the drain line is closed so that the oil lines inside the test solenoid valve and the fast acting solenoid valve can be flushed.

For example, during the 4th Actuator Close Test & Internal flushing, the test solenoid valve can be set to close mode. At this time, a flow path may be formed between the P port and the B port, and a flow path may be formed between the T port and the A port. Additionally, the fast acting solenoid valve can be set to open mode. At this time, a flow path may be formed between the P port and the A port, and a flow path may be formed between the T port and the B port. Accordingly, the oil inside the test solenoid valve and the fast acting solenoid valve can be drained and the drain line can be flushed.

What has been described above is only one embodiment for carrying out the present invention, and the present invention is not limited to the above-described embodiments, and the present invention can be applied without departing from the gist of the present invention as claimed in the following claims. Anyone skilled in the art will say that the technical spirit of the present invention extends to the extent that various modifications can be made.

10: main control valve 30: flushing device
32: operating valve 34: handle
36: Flushing block

Claims (4)

A flushing block that communicates with the main control valve and has a plurality of flow paths formed therein;
an operating valve coupled to the flushing block to open and close the flow path or to form a flow path between a plurality of ports; and
A flushing device comprising a handle coupled to the operating valve to change the mode of the operating valve. According to claim 1,
The operating valve forms a flow path between different ports within the flushing block in a flushing mode, an open mode in which the oil flow path in the main control valve is opened, and a closed mode in which the oil flow path in the main control valve is closed. A flushing device. According to claim 1,
A flushing device in which the pressure of control oil in the flushing mode is 1600 Psig. According to claim 1,
A flushing device in which the oil passage in the main control valve is flushed according to the mode of the operation valve.