KR101155528B1 - Apparatus for observing a safety valve bypass element - Google Patents

Abstract

The present invention is a safety valve for discharging the internal steam of the boiler to the double-acting operation cylinder in which the operating oil flows to the upper and lower piston by the control of the servo valve; And an SBE remote monitoring device for being applied to a safety valve bypass element (SBE) which raises a piston by flowing hydraulic oil in an upper part of a piston to an upper part of a piston through an upper inlet, an SBE flow control valve, and a lower outlet during an abnormal driving. A lower flow path for guiding hydraulic oil discharged from the outlet to the lower part of the piston; A solenoid flow path opening and closing device for opening and closing the bottom flow path between the working cylinder and the SBE; And a pressure measuring device for measuring a pressure between the solenoid flow opening and closing device and the SBE flow control valve while the solenoid flow opening and closing device closes the lower flow passage, and the solenoid flow opening and closing device and the SBE by the pressure measuring device in normal operation. When the pressure between the flow control valve is detected, characterized in that the SBE is determined to be a failure.

SBE, remote, surveillance, device

Description

SPE monitoring device {APPARATUS FOR OBSERVING A SAFETY VALVE BYPASS ELEMENT}

The present invention relates to an SBE remote monitoring apparatus, and more particularly, to an SBE remote monitoring apparatus configured to remotely monitor a state of an SBE to determine whether an SBE has failed.

1 is a perspective view of a safety valve installed in the prior art SBE. FIG. 2A is a hydraulic circuit diagram of a thermal power plant boiler safety valve during normal operation of a boiler according to the prior art, and FIG. 2B is a hydraulic circuit diagram of a thermal power plant boiler safety valve when an excessive steam pressure rises in the boiler (abnormal operation).

In general, a standard coal-fired power plant is provided with a total of eight safety valves 10, which are facilities for preventing an abnormal increase in steam pressure, for four main steams and four for reheat steam for each generator. Four main steams are installed at the outlet of the superheater and four reheat steams are installed at the two outlets at the inlet side of the reheater.

The safety valve 10 has a function of releasing steam to the outside when the steam pressure in the boiler (not shown) excessively rises. The safety valve 10 is an essential device to prevent an accident when the steam pressure in the boiler rises excessively. The safety valve 10 includes a servovalve 20, a working cylinder 30 and an SBE 40. In the safety valve 10, one servo valve 20 and three safety valve bypass elements (SBEs) 40 are positioned in a 90 ° direction.

The servovalve 20 serves to control the actuating cylinder 30 by adjusting the hydraulic pressure to obtain the desired mechanical displacement in the servo system. The servo system is a control system that controls the displacement of an object's position, orientation, posture, and the like to follow a change in a desired target value.

The servo valve 20 includes a hydraulic oil supply port 21 through which hydraulic oil is supplied from a hydraulic pump (not shown), an upper port 22 for supplying hydraulic oil to an upper portion of the operating cylinder 30, and a lower portion of the operating cylinder 30. A lower port 23 for receiving hydraulic oil discharged therethrough, and a return port 24 for returning the hydraulic oil to an oil tank (not shown).

On the other hand, the working cylinder 30 includes a piston 31 and is connected to the servovalve 20 and the SBE 40. The disk 50 is connected to the lower portion of the piston 31. The upper portion of the working cylinder 30 is connected to the upper port 22 of the servo valve 20 through the upper supply flow passage 33 and to the SBE check valve 41 through the upper flow passage 34. In addition, the lower portion of the working cylinder 30 is connected to the SBE flow control valve 43 through the lower flow passage 35, and is connected to the lower port 23 of the servo valve 20 through the lower discharge flow passage 36. .

The working cylinder 30 serves to open the safety valve 10 when the steam pressure of the boiler rises. The working cylinder 30 is a double acting cylinder. Unlike single-acting cylinders, double-acting cylinders include ports for supplying and discharging hydraulic fluid on both sides of the piston 31 in the cylinder, so that the hydraulic pressure acts upon the return of the cylinder as well as when the cylinder returns. Says cylinder.

SBE (40) is a hydraulic fluid accommodated in the upper portion of the piston 31 in the operating cylinder 30 in the abnormal operation of the boiler, the steam pressure in the boiler excessively rises, the upper inlet (40a), SBE flow control valve 43 And a lower portion of the piston 31 in the operation cylinder 30 via the lower outlet 40b to raise the piston 31 so that the safety valve 10 is quickly operated. SBE 40 includes an SBE check valve 41, an SBE solenoid valve 42, an SBE flow control valve 43, and an SBE bypass line 44.

The SBE check valve 41 is connected to the top of the working cylinder 30 by the upper flow path 34. The upper flow path 34 is a passage that guides the hydraulic oil on the upper portion of the piston 31 in the working cylinder 30 to the upper inlet 40a.

 The SBE solenoid valve 42 forms a magnetic field when a current flows in the cylindrical coil, and controls the flow of the working oil by opening and closing the valve by the formed magnetic field. The SBE solenoid valve 42 is excited when the boiler is in normal operation, and when the steam pressure in the boiler rises above the set value, the current is blocked by the controller (not shown).

The SBE flow control valve 43 is closed or opened depending on whether the boiler is normally operated, thereby blocking or unblocking the flow of hydraulic oil flowing through the SBE bypass line 44.

The SBE flow control valve 43 is closed when the SBE solenoid valve 42 is excited. That is, the hydraulic oil introduced into the SBE through the upper inlet 40a is supplied to the SBE flow control valve 43 via the SBE check valve 41 and the SBE solenoid valve 42. At this time, the working oil in the SBE flow control valve 43 pushes the compression spring so that the SBE flow control valve 43 is in a closed state.

When the SBE flow control valve 43 is in the closed state, the hydraulic oil does not flow into the lower portion of the working cylinder 30 through the lower flow passage 35. In addition, the working oil flowing through the SBE bypass line 44 is blocked by the SBE flow control valve 43 to flow into the lower flow path 35.

On the other hand, if the pressure in the boiler rises above the set value, the power applied to the SBE solenoid valve 42 is cut off by the control unit, and the SBE solenoid valve 42 operates in a position where the hydraulic fluid is not supplied into the SBE flow control valve 43. do. Thereby, the SBE flow control valve 43 is in an open state.

When the SBE flow control valve 43 is in the open state, the working oil is discharged to the lower flow path 35 without entering the SBE flow control valve 43. In addition, the hydraulic oil flowing through the SBE bypass line 44 via the upper inlet 40a is introduced into the lower portion of the working cylinder 30 through the lower flow passage 35. On the other hand, the lower passage 35 is a passage for guiding the hydraulic oil flowing out of the lower outlet 40b to the lower portion of the piston 31 of the operation cylinder 30.

2A is a hydraulic circuit diagram of a thermal power plant boiler safety valve 10 during normal operation of the boiler. The arrow is the flow direction of the working oil.

In the case where the boiler is normally operated, the working cylinder 30 is controlled by the servovalve 20. When the safety valve 10 does not operate, the servo valve 20 supplies hydraulic oil through the upper supply passage 33 and discharges the hydraulic oil through the lower discharge passage 36 to return to the oil tank.

On the other hand, in the case of normal operation of the boiler, the SBE solenoid valve 42 is always excited, so that the working oil flowing through the upper flow passage 34 flowed out from the upper portion of the working cylinder 30 is the SBE check valve 41 and the SBE. It is supplied to the SBE flow control valve 43 via the solenoid valve 42. At this time, the SBE flow control valve 43 is in a closed state and closes the SBE bypass line 44. Therefore, the flow of hydraulic fluid is interrupted by the lower flow path 35 by the SBE flow control valve 43.

2b is a hydraulic circuit diagram of a thermal power plant boiler safety valve when the steam pressure of the boiler rises above a set value and the SBE is operated. The arrow is the flow direction of the working oil.

When the steam pressure inside the boiler rises above the set value, the safety valve 10 operates. As shown in FIG. 2B, the servo valve 20 is controlled to a position in which the hydraulic oil is not supplied to the upper supply flow passage 33 and is not supplied with the hydraulic oil through the lower discharge flow passage 36.

In addition, when excessive pressure acting on the disk 50 is sensed, the current applied to the SBE solenoid valve 42 is blocked by the controller (not shown), so that the SBE solenoid valve 42 is the SBE flow control valve 43. It is operated to the position to discharge the hydraulic fluid in the inside. That is, the hydraulic oil in the SBE flow control valve 43 flows to the lower portion of the working cylinder 30 through the lower flow passage 35 through the SBE solenoid valve 42. Therefore, the hydraulic oil which was in the upper part of the working cylinder 30 flows through the upper flow path 34, and is supplied to the lower part of the working cylinder 30 through the SBE bypass line 44 and the lower flow path 35. The working cylinder 30 is forced upward by the hydraulic oil supplied to the lower working cylinder 30 so that the safety valve 10 is opened.

In the case of failure of the SBE 40, the SBE flow control valve 43 is opened even when the boiler is in normal operation, so that the hydraulic oil is supplied to the operating cylinder 30 through the SBE bypass line 44 and the lower passage 35. There is a problem that the safety valve 10 is opened by being supplied to the bottom.

When replacing the SBE 40, there is a problem that the operating oil is discharged from the upper flow path 34 and the lower flow path 35, the output of the power plant is reduced.

In addition, during the replacement of the SBE 40, the function of the safety valve 10 is not realized, and in the case of a system frequency sudden change, there is a risk of a large-scale accident of a power plant due to mass loss of the boiler tube. In order to prevent such an accident, the SBE 40 is disassembled from the safety valve 10 during the planned maintenance period of the power plant to check whether the SBE 40 is broken.

However, there is a problem in that the operation of the power plant can not determine which of the three SBE mounted on the safety valve 10 is broken.

Therefore, the present invention has been made to solve the above problems, the first object of the present invention, SBE remote monitoring device that can remotely monitor the failure of the SBE even without disassembling the SBE from the safety valve It is intended to provide.

A second object of the present invention is to provide an SBE remote monitoring apparatus capable of determining whether or not a SBE is broken even during operation of a power plant.

The third object of the present invention is that, when the safety valve is opened during the normal operation of the boiler due to the SBE failure, the solenoid flow path opening and closing device closes the lower flow path to block the flow of hydraulic oil flowing from the SBE to the working cylinder, It is an object of the present invention to provide a SBE remote monitoring device that can prevent the opening of a safety valve during normal operation.

A fourth object of the present invention is to provide a SBE remote monitoring device that can select and replace only the failed SBE among the three SBEs installed in the safety valve, so that the function of the safety valve can be performed even when the SBE is replaced. do.

A fifth object of the present invention is to provide a SBE remote monitoring apparatus that can prevent a boiler tube from being damaged by performing a function of a safety valve even when the SBE is replaced.

A sixth object of the present invention is to provide a SBE remote monitoring apparatus that can prevent a large accident of a power plant by preventing a breakdown of a boiler tube.

The present invention provides a safety valve (the safety valve discharges the internal steam of the boiler by a double-acting operation cylinder in which hydraulic oil flows up and down the piston under the control of a servo valve); And a safety valve bypass element (SBE), wherein the SBE comprises an upper inlet, an SBE flow regulating valve and a lower outlet, the upper inlet connected to an upper portion of the double acting actuating cylinder, and the SBE flow regulating valve being connected to the upper inlet. And the lower outlet, the lower outlet is connected to the lower part of the double acting actuating cylinder, and when the abnormal operation is carried out the hydraulic oil of the upper piston to the lower portion of the piston via the upper inlet, SBE flow control valve and the lower outlet A SBE monitoring device for being applied to (inflow and raise the piston), comprising: a lower flow passage for guiding hydraulic oil discharged from the lower outlet to the lower portion of the piston; A solenoid flow path opening and closing device for opening and closing the lower flow path between the double-acting operation cylinder and the SBE; And a pressure measuring device measuring a pressure between the solenoid flow opening and closing device and the SBE flow control valve in a state in which the solenoid flow opening and closing device closes the lower flow passage. When the pressure between the solenoid flow opening and closing device and the SBE flow control valve is sensed, it is characterized in that the SBE is determined to be a failure.

The solenoid flow channel opening and closing device opens and closes the lower flow path by an external signal from a remote location, and the pressure measuring device measures pressure and transmits a measured value to the remote location.

The present invention provides a safety valve (the safety valve discharges the internal steam of the boiler by a double-acting operation cylinder in which hydraulic oil flows up and down the piston under the control of a servo valve); And a safety valve bypass element (SBE), wherein the SBE includes an upper inlet, an SBE flow regulating valve and a lower outlet, the upper inlet connected to an upper portion of the double acting actuating cylinder, and the SBE flow regulating valve is connected to the upper inlet. And the lower outlet, the lower outlet is connected to the lower part of the double acting actuating cylinder, and when the abnormal operation is carried out the hydraulic oil of the upper piston to the lower portion of the piston via the upper inlet, SBE flow control valve and the lower outlet A SBE monitoring device for being applied to (inflow and raise the piston), comprising: a lower flow passage for guiding hydraulic oil discharged from the lower outlet to the lower portion of the piston; A solenoid flow path opening and closing device for opening and closing the lower flow path between the double-acting operation cylinder and the SBE; And a flow rate measuring device for measuring a flow rate between the solenoid flow opening and closing device and the SBE flow control valve in a state in which the solenoid flow opening and closing device closes the lower flow path. When the flow rate between the solenoid flow opening and closing device and the SBE flow control valve is detected, it is determined that the SBE is a failure.

The solenoid flow path opening and closing device is characterized in that the opening and closing periodically.

In addition, the present invention includes an upper flow path for guiding the hydraulic oil of the upper piston portion to the upper inlet; An upper flow path blocking device for manually opening and closing the upper flow path; And a lower flow path blocking device for manually opening and closing the lower flow path.

The present invention configured as described above has the following effects.

The first effect of the present invention is to enable the remote monitoring of the failure of the SBE even without disassembling the SBE from the safety valve.

A second effect of the present invention is to make it possible to determine whether a failure of the SBE even during operation of the power plant.

The third effect of the present invention is that, when the safety valve is opened during normal operation of the boiler due to the failure of the SBE, the solenoid flow channel opening and closing device closes the lower flow path and blocks the flow of hydraulic oil flowing from the SBE to the working cylinder, It is to prevent the opening of the safety valve during normal operation.

The fourth effect of the present invention is that only the failed SBE can be selected and replaced among the three SBEs installed in the safety valve, so that the function of the safety valve can be performed even when the SBE is replaced.

The fifth effect of the present invention is to prevent the boiler tube from being cut by allowing the safety valve to function even when the SBE is replaced.

A sixth effect of the present invention is to prevent a large accident of the power plant by preventing a breakdown of the boiler tube.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1st Example

3 is a perspective view of a safety valve equipped with an SBE and a SBE remote monitoring apparatus according to the first embodiment of the present invention. 4 is a hydraulic circuit diagram of a thermal power plant boiler safety valve when the SBE is in a normal state according to the first embodiment of the present invention, and FIG. 5 is a thermal power plant when the SBE is broken according to the first embodiment of the present invention. Hydraulic circuit diagram of a boiler safety valve. 4 is a case where the boiler (not shown) is in normal operation.

The present inventors SBE remote monitoring device 100 is located between the safety valve 10 and the SBE (40). The SBE remote monitoring apparatus 100 includes an upper flow path 110, a lower flow path 120, a pressure measuring device 130, a solenoid flow opening and closing device 140, an upper flow path blocking device 150, and a lower flow path blocking device 160. And a remote control device 170 at a remote location. The SBE remote monitoring apparatus 100 is a device that remotely monitors the SBE 40 in the remote control apparatus 170 and determines whether the SBE 40 has failed.

On the other hand, the safety valve 10 is a device for discharging the internal steam of the boiler (not shown) to the double-acting operation cylinder 30, the hydraulic oil flows to the upper and lower piston 31 by the control of the servo valve (20).

The SBE (Safety valve Bypass Element) 40 includes an upper inlet 40a, an SBE flow control valve 43 and a lower outlet 40b, which connects to the top of the double acting actuating cylinder 30. And, the SBE flow control valve 43 is located between the upper inlet 40a and the lower outlet 40b, the lower outlet 40b is connected to the lower portion of the double-acting operation cylinder 30, the piston in abnormal operation ( 31) It is a device that raises the piston 31 by flowing the hydraulic oil in the upper portion to the lower portion of the piston 31 via the upper inlet 40a, the SBE flow control valve 43 and the lower outlet 40b. SBE 40 includes an SBE check valve 41, an SBE solenoid valve 42, an SBE flow control valve 43, and an SBE bypass line 44. The SBE flow control valve 43 is in a closed state during the normal operation of the boiler and is in an open state during the abnormal operation of the boiler.

The upper flow path 110 is a passage for guiding the hydraulic oil of the upper portion of the piston 31 in the working cylinder 30 to the upper inlet 40a. The upper flow path 110 connects the upper portion of the working cylinder 30 and the SBE check valve 41. The upper flow path blocking device 150 is positioned in the upper flow path 110.

The lower flow passage 120 is a passage that guides the hydraulic oil flowing out of the lower outlet 40b to the lower portion of the piston 31 of the operation cylinder 30. The lower passage 120 connects the lower portion of the SBE flow control valve 43 and the working cylinder 30. A pressure measuring device 130, a solenoid flow opening and closing device 140, and a lower flow path blocking device 160 are positioned in the lower flow path 120.

The pressure measuring device 130 is positioned between the solenoid flow path opening and closing device 140 and the SBE flow control valve 43 on the lower flow path 120. The pressure measuring device 130 measures the pressure of the working oil between the solenoid flow opening and closing device 140 and the SBE flow control valve 43 in a state in which the lower flow passage 120 is closed by the solenoid flow opening and closing device 140.

The pressure measuring device 130 transmits the measured pressure value to the remote control device 170 at a remote location. If, during normal operation of the boiler, if the pressure of the hydraulic oil is measured in the pressure measuring device 130, the SBE 40 is in a failure state.

The solenoid flow path opening and closing device 140 is located between the pressure measuring device 130 and the working cylinder 30 on the lower flow path 120. The solenoid flow path opening and closing device 140 opens and closes the lower flow path 120 by an external signal of the remote control device 170. When power is applied to the solenoid flow path opening and closing device 140 by an external signal, the lower flow path 120 is closed, and when the power is cut off, the lower flow path 120 is opened. On the other hand, the solenoid flow path opening and closing device 140 may be opened and closed periodically without an external signal.

The upper flow path blocking device 150 is located on the upper flow path 110. The upper flow path blocking device 150 is manually operated and opened and closed by an operator. The upper flow path blocking device 150 maintains an open state while the boiler is running, and is manually operated and closed when the SBE 40 is replaced.

The lower flow path blocking device 160 is located on the lower flow path 120. The lower flow path blocking device 160 is manually operated and opened and closed by an operator. The lower flow path blocking device 160 maintains an open state while the boiler is running, and is manually operated and closed when the SBE 40 is replaced.

Hereinafter, the flow of the working oil will be described when the boiler is in normal operation and the SBE is in a normal state. In addition, an arrow is a flow direction of hydraulic fluid.

As shown in FIG. 4, during normal operation of the boiler, the operation cylinder 30 is controlled by the servovalve 20, so that the hydraulic oil is supplied to the upper portion of the operation cylinder 30 through the upper supply flow path 33. It is discharged through the lower discharge passage 36 connected to the lower portion of the working cylinder (30). On the other hand, during normal operation of the boiler, the SBE solenoid valve 42 is excited and the SBE flow control valve 43 is in a closed state.

In order to determine whether the working oil flows in the lower flow path 120, power is applied from the remote control device 170 to the solenoid flow path opening and closing device 140. When power is applied to the solenoid flow path opening and closing device 140, the solenoid (not shown) in the solenoid flow path opening and closing device 140 is excited, thereby closing the lower flow path 120. Therefore, the lower passage 120 is closed by the SBE flow control valve 43 and the solenoid passage opening and closing device 140 during the normal operation of the boiler.

The pressure measuring device 130 measures the pressure of the hydraulic oil between the solenoid flow opening and closing device 140 and the SBE flow control valve 43 in a state where the lower flow passage 120 is closed by the solenoid flow opening and closing device 140. do.

The SBE remote monitoring apparatus 100 determines that the SBE 40 is in a normal state when the pressure of the hydraulic oil is not measured by the pressure measuring device 130 when the boiler is in normal operation.

Hereinafter, the flow of the working oil will be described when the SBE is in a fault state. In addition, an arrow is a flow direction of hydraulic fluid.

As shown in Figure 5, when the SBE is broken, the operating oil of the upper portion of the piston 31 is the upper inlet 40a, the SBE flow control valve (not only when the steam pressure of the boiler is higher than the set value, but also when the boiler is in normal operation). 43 and through the lower flow path 120 via the lower outlet 40b.

When the steam pressure of the boiler is higher than or equal to the set value, the current applied to the SBE solenoid valve 42 is cut off, and the SBE flow control valve 43 is opened. In addition, when the SBE has failed, even when the boiler is in normal operation, the application of current to the SBE solenoid valve 42 is cut off, and the SBE flow regulating valve 43 is opened.

In order to determine whether the working oil flows in the lower flow path 120, power is applied from the remote control device 170 to the solenoid flow path opening and closing device 140. When power is applied, the solenoid in the solenoid flow path opening and closing device 140 is excited, and the lower flow path 120 is closed by the solenoid flow path opening and closing device 140. At this time, the working oil does not flow in the lower flow path 120 between the solenoid flow path opening and closing device 140 and the lower portion of the working cylinder 30.

However, at the time of SBE failure, the lower flow path 120 between the SBE flow control valve 43 and the solenoid flow opening and closing device 140 passes through the upper inlet 40a, the SBE flow control valve 43, and the lower outlet 40b. One working oil flows.

The pressure measuring device 130 measures the pressure of the hydraulic oil between the solenoid flow opening and closing device 140 and the SBE flow control valve 43 in a state where the lower flow passage 120 is closed by the solenoid flow opening and closing device 140. do.

The SBE remote monitoring apparatus 100 determines that the SBE 40 is in a failure state when the pressure of the hydraulic oil is measured by the pressure measuring device 130.

Second Example

6 is a hydraulic circuit diagram of a thermal power plant boiler safety valve according to a second embodiment of the present invention.

In the present embodiment, the SBE remote monitoring apparatus 200 includes an upper flow path 210, a lower flow path 220, a flow rate measuring device 230, a solenoid flow opening and closing device 240, an upper flow path blocking device 250, and a lower flow path. Blocking device 260.

In the present embodiment, the upper flow path 210, the lower flow path 220, the solenoid flow opening and closing device 240, the upper flow path blocking device 250, and the lower flow path blocking device 260 performing the same functions as the first embodiment described above. Repetitive explanations on the function and installation location of) will be omitted. In addition, since the flow of the hydraulic fluid in the normal state or the SBE failure state of the SBE is the same as the first embodiment described above, a repeated description thereof will be omitted. Hereinafter, the flow rate measuring device 230 different from the above-described first embodiment will be described.

The flow rate measuring device 230 is positioned between the solenoid flow path opening and closing device 240 and the SBE flow control valve 43 on the lower flow path 220. The flow rate measuring device 230 measures the flow rate of the working oil between the solenoid flow path opening and closing device 240 and the SBE flow control valve 43 in a state where the lower flow path 220 is closed by the solenoid flow channel opening and closing device 240. The flow rate measuring device 230 transmits the measured flow rate value to a remote location. If the flow rate of the working oil is measured by the pressure measuring device 130 during the normal operation of the boiler, the SBE remote monitoring apparatus 100 determines that the SBE 40 is in a failure state.

The illustrative embodiments described above are intended to be illustrative within all aspects of the invention rather than limiting. Accordingly, the present invention is capable of many modifications and detailed implementations which may be obtained from those contained within the specification by those skilled in the art. All such modifications and variations are considered to be within the scope and spirit of the invention as defined by the following claims.
On the other hand, the reference numerals written in the claims are only described to help understand the connection of the components, and the scope of the right is not limited to the configuration described in the drawings. In addition, the parentheses described in the claims are used for clarity of the claims, and the description in the parentheses is not an optional limitation, but an essential component of the claims, including all the descriptions in the parentheses, and the scope of the claims. Will be determined.

1 is a perspective view of a safety valve with a SBE installed according to the prior art;

Figure 2a is a hydraulic circuit diagram of a thermal power plant boiler safety valve in normal operation of the boiler, according to the prior art.

Figure 2b is a hydraulic circuit diagram of a thermal power plant boiler safety valve at the steam pressure rise of the boiler, according to the prior art.

3 is a perspective view of a safety valve in which an SBE and a SBE remote monitoring apparatus are installed, according to the first embodiment of the present invention.

4 is a hydraulic circuit diagram of a thermal power plant boiler safety valve when the boiler is in normal operation when the SBE is in a normal state according to the first embodiment of the present invention.

5 is a hydraulic circuit diagram of a thermal power plant boiler safety valve in the case of a failure of the SBE according to the first embodiment of the present invention.

6 is a hydraulic circuit diagram of a thermal power plant boiler safety valve according to a second embodiment of the present invention.

Claims (5)

Safety valve 10 (the safety valve 10 discharges internal steam of the boiler by a double-acting operation cylinder 30 in which hydraulic oil flows up and down the piston 31 by the control of the servo valve 20); And a safety valve bypass element (SBE 40) (the SBE 40 includes an upper inlet 40a, an SBE flow control valve 43, and a lower outlet 40b, wherein the upper inlet 40a is the double acting type). It is connected to the upper portion of the working cylinder 30, the SBE flow control valve 43 is located between the upper inlet 40a and the lower outlet 40b, the lower outlet 40b is the double acting cylinder It is connected to the lower portion of the 30, and when the abnormal operation of the operating oil of the upper portion of the piston 31 through the upper inlet (40a), SBE flow control valve 43 and the lower outlet (40b) to the lower portion of the piston (31) In the SBE monitoring device to be applied to the (is raised to raise the piston 31), A lower flow passage 120 for guiding hydraulic oil discharged from the lower outlet 40b to the lower portion of the piston 31; A solenoid flow path opening and closing device (140) for opening and closing the lower flow path (120) between the double acting actuation cylinder (30) and the SBE (40); And Pressure measuring device 130 for measuring the pressure between the solenoid flow path opening and closing device 140 and the SBE flow control valve 43 in a state in which the solenoid flow path opening and closing device 140 is closed the lower flow path (120) Including, When the pressure between the solenoid flow path opening and closing device 140 and the SBE flow control valve 43 is sensed by the pressure measuring device 130 during normal operation, it is determined that the SBE 40 is a failure. SBE monitoring device. The method of claim 1, The solenoid flow path opening and closing device 140 opens and closes the lower flow path 120 by an external signal of a remote place, The pressure measuring device 130 measures the pressure and transmits the measured value to the remote location. Safety valve 10 (the safety valve 10 discharges internal steam of the boiler by a double-acting operation cylinder 30 in which hydraulic oil flows up and down the piston 31 by the control of the servo valve 20); And a safety valve bypass element (SBE) 40 (the SBE 40 includes an upper inlet 40a, an SBE flow control valve 43, and a lower outlet 40b, wherein the upper inlet 40a is the double acting type). It is connected to the upper portion of the working cylinder 30, the SBE flow control valve 43 is located between the upper inlet 40a and the lower outlet 40b, the lower outlet 40b is the double acting cylinder It is connected to the lower portion of the 30, and when the abnormal operation of the operating oil of the upper portion of the piston 31 through the upper inlet (40a), SBE flow control valve 43 and the lower outlet (40b) to the lower portion of the piston (31) In the SBE monitoring device to be applied to the (is raised to raise the piston 31), A lower flow passage 220 for guiding hydraulic oil discharged from the lower outlet 40b to the lower portion of the piston 31; A solenoid flow path opening and closing device 240 for opening and closing the lower flow path 220 between the double acting actuation cylinder 30 and the SBE 40; And The flow rate measuring device 230 for measuring the flow rate between the solenoid flow path opening and closing device 240 and the SBE flow control valve 43 in a state in which the solenoid flow path opening and closing device 240 closed the lower flow path 220. Including, When the flow rate between the solenoid flow path opening and closing device 240 and the SBE flow control valve 43 is detected by the flow rate measuring device 230 during normal operation, it is determined that the SBE 40 is a failure. SBE monitoring device. The method according to claim 1 or 3, The solenoid flow path opening and closing device 240 is SBE monitoring device, characterized in that the opening and closing periodically. The apparatus of claim 1 or 3, wherein the SBE monitoring apparatus An upper flow path (210) for guiding hydraulic oil on the upper portion of the piston (31) to the upper inlet (40a); An upper flow path blocking device 250 for manually opening and closing the upper flow path 210; And SBE monitoring device, characterized in that it further comprises a lower flow path blocking device (260) for manually opening and closing the lower flow path (220).

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