Emergency shutdown loop with low oil pressure fluctuation

Abstract

The utility model provides an emergency shut-down loop with low oil pressure fluctuation, which belongs to the technical field of emergency shut-down control loops of main steam valves of steam turbines and comprises a rack, an oil path block arranged in the rack and mounting blocks arranged on two sides of the oil path block, and a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve and a fourth electromagnetic valve which are respectively arranged on the two mounting blocks. The first electromagnetic valve and the second electromagnetic valve form a group, the first electromagnetic valve and the second electromagnetic valve are connected in parallel, the third electromagnetic valve and the fourth electromagnetic valve form a group, the third electromagnetic valve and the fourth electromagnetic valve are connected in parallel, and the two groups of electromagnetic valves are connected in series. According to the method, functional inspection can be carried out on the electromagnetic valves without shutdown, precautions are taken in the bud, when any single electromagnetic valve loses power, operation of a unit is not affected, the electromagnetic valves can be replaced on line, the electromagnetic valves do not need to be specially customized, cost is saved, and meanwhile using safety and economical efficiency are greatly improved.

Description

Technical Field

[0001] This utility model mainly relates to the technical field of emergency shutdown control circuit of main steam valve of steam turbine, specifically an emergency shutdown circuit with low oil pressure fluctuation. Background Technology

[0002] A steam turbine is a rotary power machine that converts the thermal energy of steam into mechanical energy. Steam expands and accelerates through nozzles or stationary blades, forming a high-speed airflow, which then impacts the moving blades, causing the moving blades to drive the impeller to rotate, thereby converting the kinetic energy of steam into mechanical energy and realizing energy conversion.

[0003] The main steam valve is a core safety component of the steam turbine, and the quick-closing assembly is the main control component for opening and closing the main steam valve. By changing the opening degree of the main steam valve, the amount of steam entering the steam turbine is precisely controlled, thereby adjusting the speed and output power of the steam turbine. For example, when the power demand increases, the main steam valve is opened wider to allow more steam to enter the steam turbine, increasing the speed and power to meet the power generation demand. It is also an important actuator of the steam turbine protection system. When the unit malfunctions or needs to be shut down urgently, it can be quickly closed in a very short time to immediately cut off the steam intake of the steam turbine, prevent the accident from escalating, and ensure the safety of equipment and personnel.

[0004] Currently, the mainstream redundant shutdown methods for quick-closing assemblies in existing low-pressure regulation systems are two-to-one, three-to-two, and any four-to-two. The two-to-one redundant shutdown method has only two shutdown signals or channels. If one of them malfunctions, such as a false signal or a malfunctioning solenoid valve, it may lead to unnecessary shutdowns, affecting the continuity and stability of production. The three-to-two redundant shutdown method, when faced with common-mode fault factors such as oil contamination or electromagnetic interference, may simultaneously affect two of the three signal channels or components, making it impossible to correctly interpret the shutdown signal and causing the protection system to fail. The any four-to-two redundant shutdown method, with multiple channels and components, increases the complexity of fault diagnosis and troubleshooting. When a fault occurs, it is difficult to quickly and accurately determine which component or channel is malfunctioning, potentially delaying repairs and production recovery. Utility Model Content

[0005] This utility model provides a solution that is significantly different from existing technologies, addressing the problem that existing solutions are too simplistic. Specifically, this utility model provides an emergency shutdown circuit with low oil pressure fluctuations to solve the problem mentioned in the background art. In the current low-pressure regulation system, the mainstream redundant shutdown methods of the quick-closing assembly are two-choose-one, three-choose-two, and any four-choose-two. These methods all have certain drawbacks and can easily affect the continuity and stability of production.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0007] An emergency shutdown circuit for low oil pressure fluctuation includes a frame, an oil passage block and two mounting blocks on both sides of the oil passage block. Solenoid valves one and two, and solenoid valves three and four are respectively mounted on the two mounting blocks. Solenoid valves one and two form a group and are connected in parallel, while solenoid valves three and four form a group and are connected in parallel. The two groups of solenoid valves are connected in series.

[0008] Furthermore, one of the mounting blocks is provided with throttling orifice two and throttling orifice five, and the other mounting block is provided with throttling orifice one and throttling orifice four.

[0009] Furthermore, the oil passage block is provided with a throttling orifice three.

[0010] Furthermore, the oil circuit block is also provided with pressure testing point 1, pressure testing point 2, pressure testing point 3, pressure testing point 4 and pressure testing point 5. Pressure testing point 1 and pressure testing point 2 are located on the same mounting block, pressure testing point 3 and pressure testing point 4 are located on another mounting block, and pressure testing point 5 is located on the oil circuit block.

[0011] Furthermore, one of the mounting blocks is provided with a stop valve one and a stop valve two on one side of its outer wall, and the other mounting block is provided with a stop valve three, a stop valve four and a stop valve five on its outer wall.

[0012] Furthermore, cartridge valve one and cartridge valve two are respectively provided in the two round holes of the oil circuit block, cartridge valve three and cartridge valve four are provided on the outer wall of one of the mounting blocks, and cartridge valve five and cartridge valve six are provided on the outer wall of the other mounting block.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] This utility model uses four solenoid valves to form a dual-channel system. When any two of them lose power, there are a total of six combinations. Four of these combinations can achieve remote and rapid closing of the main steam valve. The loss of power to the remaining two combinations (solenoid valve one and solenoid valve two, solenoid valve three and solenoid valve four) or any single solenoid valve has no impact on the operation of the unit.

[0015] By utilizing the above characteristics, key pressure measurement points one, two, three, four, and five can be configured to enable online testing, that is, to perform functional checks on the four solenoid valves without shutting down the system, thus preventing potential problems.

[0016] By setting throttle orifice three, throttle orifice four, and throttle orifice five, it is ensured that the machine can be stopped remotely and quickly in an emergency. In the two cases of de-energization of solenoid valves one and two, and solenoid valves three and four, the control chambers of cartridge valve one and cartridge valve two will only receive a very small pressure fluctuation.

[0017] By operating gate valve 1, gate valve 2, gate valve 3, gate valve 4, and gate valve 5, the four solenoid valves and cartridge valves 3, 4, 5, and 6 can be replaced online.

[0018] Solenoid valves do not require special customization, saving costs.

[0019] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0020] Figure 1 This is an exploded view of the emergency shutdown circuit structure for low oil pressure fluctuations according to this utility model.

[0021] In the diagram: 000, Frame; 001, Oil circuit block; 002, Mounting block; 1, Solenoid valve one; 2, Solenoid valve two; 3, Solenoid valve three; 4, Solenoid valve four; 5, Throttling orifice one; 6, Throttling orifice two; 7, Throttling orifice three; 8, Throttling orifice four; 9, Throttling orifice five; 10, Pressure measuring point one; 11, Pressure measuring point two; 12, Pressure measuring point three; 13, Pressure measuring point four; 14, Pressure measuring point five; 15, Shut-off valve one; 16, Shut-off valve two; 17, Shut-off valve three; 18, Shut-off valve four; 19, Shut-off valve five; 20, Cartridge valve one; 21, Cartridge valve two; 22, Cartridge valve three; 23, Cartridge valve four; 24, Cartridge valve five; 25, Cartridge valve six. Detailed Implementation

[0022] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the utility model more thorough and comprehensive.

[0023] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated with those skilled in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] Please refer to the appendix carefully. Figure 1 An emergency shutdown circuit for low oil pressure fluctuation includes a frame 000. An oil passage block 001 is installed within the frame 000, and mounting blocks 002 are located on both sides of the oil passage block 001. Solenoid valves 1 and 2, and 3 and 4 are respectively installed on the two mounting blocks 002. Solenoid valves 1 and 2 form a group and are connected in parallel. Solenoid valves 3 and 4 form a group and are connected in parallel. The two groups of solenoid valves are connected in series.

[0026] The above structure enables a dual-channel control loop with low oil pressure fluctuations, allowing for functional checks of solenoid valves without shutting down the unit, preventing potential problems. Furthermore, the loss of power to any single solenoid valve has no impact on unit operation. Solenoid valves can be replaced online without the need for custom-made valves, saving costs and significantly reducing overall expenses. It also greatly improves safety and economy, demonstrating practical value and promising application prospects.

[0027] One of the mounting blocks 002 is provided with throttling orifice 2 6 and throttling orifice 5 9, and the other mounting block 002 is provided with throttling orifice 1 5 and throttling orifice 4 8. A throttling orifice 3 7 is provided within the oil passage block 001. The oil passage block 001 is also provided with pressure measuring points 10, 11, 12, 13, and 14. Pressure measuring points 10 and 11 are located on the same mounting block 002, and pressure measuring points 12 and 13 are located on... On another mounting block 002, pressure test point 514 is located on the oil circuit block 001. Through the solenoid valves connected to throttle orifice 1 5 and throttle orifice 2 6, the main steam valve remains open even when a single solenoid valve is de-energized, or solenoid valves 1 and 2 are de-energized, or solenoid valves 3 and 4 are de-energized. Combined with key pressure test points 10, 21, 312, 413, and 514, online testing of four solenoid valves can be achieved. One of the aforementioned mounting points... One side of the outer wall of mounting block 002 is provided with shut-off valve 15 and shut-off valve 26. The outer wall of the other mounting block 002 is provided with shut-off valve 317, shut-off valve 418, and shut-off valve 519. The two round holes of the oil circuit block 001 are respectively provided with cartridge valve 120 and cartridge valve 21. The outer wall of one mounting block 002 is provided with cartridge valve 32 and cartridge valve 423. The outer wall of the other mounting block 002 is provided with cartridge valve 524 and cartridge valve 625. Under different operating conditions, four solenoid valves, cartridge valve 3 22, cartridge valve 4 23, cartridge valve 5 24, and cartridge valve 6 25 can be replaced online without stopping the machine (the following operations are all under normal operation: ① First close the stop valve 5 19, then close the stop valve 1 15, and solenoid valve 1 can be replaced online, and so on; ② Close the stop valve 5 19, then close the stop valve 1 15 and the stop valve 2 16, and so on, cartridge valve 3 22 and cartridge valve 4 23 can be replaced online).

[0028] In online tests involving the de-energization of a single solenoid valve, solenoid valve 1 and solenoid valve 2, and solenoid valve 3 and solenoid valve 4, pressure fluctuations in the control chambers of cartridge valve 1 20 and cartridge valve 2 21 are inevitable due to their inherent characteristics. By setting throttling orifices 3 7, 4 8, and 5 9, the pressure fluctuations can be minimized to ensure the safety of online tests to the greatest extent possible.

[0029] The present invention has been described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. An emergency shutdown circuit with low oil pressure fluctuation, comprising a rack (000), an oil passage block (001) arranged in the rack (000), and mounting blocks (002) on both sides of the oil passage block (001), characterized in that, Two said mounting block (002) respectively provided with solenoid valve one (1) and solenoid valve two (2) and solenoid valve three (3) and solenoid valve four (4), solenoid valve one (1) and solenoid valve two (2) for a group, and solenoid valve one (1) and solenoid valve two (2) are connected in parallel, solenoid valve three (3) and solenoid valve four (4) for a group, and solenoid valve three (3) and solenoid valve four (4) are connected in parallel, two groups of electromagnetic valves are in series.

2. An emergency shutdown circuit with low oil pressure fluctuation according to claim 1, characterized in that, One of said mounting block (002) is provided with throttle hole two (6) and throttle hole five (9), the other said mounting block (002) is provided with throttle hole one (5) and throttle hole four (8).

3. An emergency shutdown circuit with low oil pressure fluctuation according to claim 1, characterized in that, The oil block (001) is provided with throttle hole three (7).

4. An emergency shutdown circuit with low oil pressure fluctuation according to claim 3, characterized in that, The oil block (001) is further provided with pressure measuring point one (10), pressure measuring point two (11), pressure measuring point three (12), pressure measuring point four (13) and pressure measuring point five (14), pressure measuring point one (10) and pressure measuring point two (11) are located on the same mounting block (002), pressure measuring point three (12) and pressure measuring point four (13) are located on the other mounting block (002), pressure measuring point five (14) is located on the oil block (001).

5. An emergency shutdown circuit with low oil pressure fluctuation according to claim 2, characterized in that, One of said mounting block (002) is provided with one side of the outer wall of the stop valve one (15) and stop valve two (16), the other said mounting block (002) is provided with the outer wall of the stop valve three (17), stop valve four (18) and stop valve five (19).

6. An emergency shutdown circuit with low oil pressure fluctuation according to claim 4, characterized in that, The two round holes of said oil block (001) are respectively provided with plug-in valve one (20) and plug-in valve two (21), one of said mounting block (002) is provided with the outer wall of the plug-in valve three (22) and plug-in valve four (23), the other said mounting block (002) is provided with the outer wall of the plug-in valve five (24) and plug-in valve six (25).

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