CN-119982118-B - Hydraulic speed regulation control system of water supply pump steam turbine valve

Abstract

The invention discloses a hydraulic speed regulation control system of a water supply pump steam turbine valve, which comprises a regulating valve control unit, wherein the regulating valve control unit comprises a regulating valve hydraulic control block and a regulating valve oil motor, a servo valve, a filter, a hydraulic control one-way valve, a differential pressure type plug-in unloading valve, an upper plug-in stop valve, a lower plug-in stop valve, a quick-closing solenoid valve, a pressure oil duct I, an oil discharge channel I and a safety oil duct are fixed in the regulating valve hydraulic control block, the safety oil duct is respectively connected with the pressure oil duct I and the differential pressure type plug-in unloading valve, the quick-closing solenoid valve is connected between the safety oil duct I and the oil discharge channel I in parallel, an oil inlet of the servo valve is communicated with the filter, a control oil port is connected with the differential pressure type plug-in unloading valve through the hydraulic control one-way valve, the differential pressure type plug-in unloading valve is connected with the lower plug-in stop valve, and the regulating valve oil motor is respectively connected with the upper plug-in stop valve and the lower plug-in stop valve. The system can realize the replacement of the servo valve and the filter element on line, and solves the technical problem that the servo valve and the filter element can not be replaced on line in the existing regulating valve speed regulating system.

Inventors

• PENG JIAQIANG
• SHAO YI
• LI QING
• LIU HONGBING
• Zhong Jinwei
• LIN QINGKUAN
• YANG MING

Assignees

• 东方电气自动控制工程有限公司

Dates

Publication Date

20260508

Application Date

20250217

Claims (8)

1. 1. A hydraulic speed regulation control system of a water supply pump turbine valve is characterized by comprising a regulating valve control unit, wherein the regulating valve control unit comprises a regulating valve hydraulic control block (1) and a regulating valve oil motor (2), a servo valve (3), a filter (4), a hydraulic control one-way valve (5), a differential pressure type plug-in unloading valve (6), an upper plug-in stop valve (7), a lower plug-in stop valve (8), a quick-action electromagnetic valve (9), a pressure oil channel I (10), an oil discharge channel I (11) and a safety oil channel (12), the pressure oil channel I (10) is respectively connected with oil inlets of the filter (4), the upper plug-in stop valve (7) and the differential pressure type plug-in unloading valve (6), one end of the safety oil channel (12) is communicated with the pressure oil channel I (10) through a safety oil throttle hole (18), the other end of the safety oil channel is communicated with a control oil inlet of the differential pressure type plug-in unloading valve (6), the quick-action electromagnetic valve (9) is connected between the safety oil channel I (11) and the oil discharge channel I (12) in a redundant mode, the safety oil channel I (12) is used for controlling whether the pressure oil channel I (12) is communicated with the servo valve (3) through the oil inlet of the differential pressure type unloading valve (6), an oil drain port of the servo valve (3) is communicated with an oil drain channel I (11), a pilot oil port of the hydraulic control one-way valve (5) is communicated with a safety oil duct (12), and a right oil port of the differential pressure type plug-in unloading valve (6) is connected with a lower plug-in stop valve (8); The main steam valve control unit comprises a main steam valve hydraulic control block (28) and a main steam valve oil motor (29), wherein a test electromagnetic valve (30), an interruption electromagnetic valve (31), a test throttle hole (32), an oil discharge channel II (33) and a pressure oil channel II (34) are fixedly arranged in the main steam valve hydraulic control block (28), one end of the pressure oil channel II (34) is communicated with a main pressure oil port through a ball valve B (38), the other end of the pressure oil channel II is communicated with a rod cavity of the main steam valve oil motor (29), one end of the oil discharge channel II (33) is used for being connected with an oil return port, the other end of the oil discharge channel II is communicated with a rodless cavity of the main steam valve oil motor (29), the interruption electromagnetic valve (31) is connected between the oil discharge channel II (33) and the pressure oil channel II (34) in a redundant mode and used for controlling whether the oil discharge channel II (33) is communicated with the pressure oil channel II (34), the test electromagnetic valve (30) and the test throttle hole (32) are sequentially connected to the pressure oil channel II (34), the oil discharge port of the test electromagnetic valve (30) is communicated with the oil discharge channel II (33), and the test electromagnetic valve (32) is located between the test electromagnetic valve (30) and the test electromagnetic valve (31).
2. 2. The hydraulic speed regulation control system of the water supply pump turbine valve according to claim 1, wherein a rodless cavity pressure measuring point A (13) is arranged between the differential pressure type plug-in unloading valve (6) and the hydraulic control one-way valve (5), and a rod cavity pressure measuring point B (14) is arranged between the upper plug-in stop valve (7) and the pressure oil duct I (10).
3. 3. The hydraulic speed regulation control system of the water supply pump turbine valve according to claim 1, wherein the first oil discharge channel (11) is provided with a one-way valve A (15) and an oil discharge pressure measuring point (16), the oil discharge pressure measuring point (16) is close to the quick-closing solenoid valve (9), and an oil discharge port of the servo valve (3) is connected between the one-way valve A (15) and the oil discharge pressure measuring point (16).
4. 4. The hydraulic speed regulation control system of the water supply pump turbine valve according to claim 1, wherein the safety oil duct (12) is provided with a safety oil pressure measuring point (17).
5. 5. The hydraulic speed regulation control system of a water supply pump turbine valve according to claim 1, further comprising a high-pressure energy storage unit (20), wherein the high-pressure energy storage unit (20) comprises an energy storage leather bag (21), a pressure oil stop valve (22), a one-way valve B (23) and an oil discharge pipe (24), an oil inlet of the one-way valve B (23) is communicated with a main pressure oil port, an oil outlet of the one-way valve B (23) is output in two ways, one way is communicated with a pressure oil duct I (10) through a ball valve A (19), the other way is communicated with the energy storage leather bag (21) through the pressure oil stop valve (22), and the oil discharge pipe (24) is connected between the pressure oil stop valve (22) and the energy storage leather bag (21).
6. 6. The hydraulic speed regulation control system of a water supply pump turbine valve according to claim 5, wherein the oil drain pipe (24) comprises an oil drain pipe (24), a pressure gauge (25), a pressure gauge stop valve (26) and an oil drain stop valve (27), one end of the oil drain pipe (24) is connected between the pressure oil stop valve (22) and the accumulator leather bag (21), the other end of the oil drain pipe is connected with an oil return port through the oil drain stop valve (27), and the pressure gauge (25) is connected to the oil drain pipe (24) through the pressure gauge stop valve (26).
7. 7. The hydraulic speed regulation control system of a water supply pump turbine valve according to claim 1, wherein the oil discharge channel II (33) is provided with a rodless cavity pressure measuring point C (35), and the pressure oil duct II (34) is provided with a rod cavity pressure measuring point D (36).
8. 8. The hydraulic speed regulation control system of the water supply pump turbine valve according to claim 1, wherein the second oil discharge channel (33) is provided with a one-way valve C (37), and an oil discharge port of the test electromagnetic valve (30) is connected with an oil inlet end of the one-way valve C (37).

Description

Hydraulic speed regulation control system of water supply pump steam turbine valve Technical Field The invention relates to the technical field of feed pump turbines, in particular to a hydraulic speed regulation control system of a valve of a feed pump turbine. Background The water feeding pump turbine is one of important equipment in a thermal power plant thermodynamic cycle system, the safe reliability of the water feeding pump turbine directly influences the safe operation of the whole unit, along with saving investment cost, reducing maintenance cost and improving economy of the unit, more and more high-parameter high-capacity turbines are only provided with a single 100% full-capacity water feeding pump turbine, but only provided with a single water feeding pump turbine, if a speed regulation system for controlling a regulating valve and a main steam valve of the water feeding pump turbine fails, the water feeding flow cannot be regulated, the operation safety of the unit is seriously influenced, and even the unit is not stopped. In order to eliminate hidden danger, improve the safe and reliable nature of feed pump steam turbine, guarantee the safe and stable operation of whole unit, people have put forward different control scheme to governing valve and main steam valve respectively, as follows respectively: For the control of a regulating valve, patent document with publication number CN213039551U discloses a water supply pump steam turbine regulating valve oil motor system, which comprises a low pressure regulating valve oil motor, a control module, a pressure oil channel, an oil return channel, a safety oil channel and a safety isolation module, wherein the safety isolation module comprises a first unloading valve, a second unloading valve, a first hydraulic control one-way valve, a second hydraulic control one-way valve and a servo valve, the pressure oil channel, the oil return channel, a lower oil cylinder cavity and an upper oil cylinder cavity of the low pressure regulating valve oil motor are communicated with a P port, a T port, an A port and a B port of the servo valve, the second hydraulic control one-way valve is communicated with the low pressure regulating valve oil motor, the first unloading valve is communicated with the pressure oil channel, the second unloading valve is communicated with the low pressure regulating valve oil motor, an oil outlet of the safety oil channel is communicated with the first hydraulic control one-way valve, the second hydraulic control one-way valve is communicated with the unloading valve, and the safety oil channel is communicated with the first unloading valve and the second unloading valve. The system has the advantages that the working state of the small machine can not be influenced by the opening degree of the regulating valve through arranging the control module on the safety oil duct and utilizing the servo valve. However, the servo valve is a very precise adjusting piece and is easy to be blocked due to the influence of oil quality, and the system can not realize the online replacement of the servo valve, so that the control precision of the adjusting valve is influenced, and the safe operation of a unit is also influenced. In addition, the system adds a filter assembly on the pressure pipeline, and can realize the on-line replacement of the filter element by opening the bypass stop valve and closing the upstream and downstream stop valves of the filter element, so that the investment cost and the maintenance cost are increased on one hand, and the replacement of the servo valve and the filter element cannot be realized simultaneously on the other hand. In the prior art, a structure of adding a filter at the oil inlet end of the servo valve to filter impurities is also provided, but the filter element is easy to block, and the prior art also does not consider online replacement of the filter element. In addition, the accumulator of the system is arranged on the pressure oil main pipe, the oil supplementing effect for the regulating valve is reduced, and the main steam valve is generally fully opened and does not participate in regulation, so that the accumulator is not required to be arranged on the pressure oil main pipe, and if the accumulator is arranged on the pressure oil main pipe, the capacity of the accumulator is required to be increased, and accordingly the cost is increased. For the control of the main steam valve, patent document CN115573960B discloses a high-pressure blocking device of a steam turbine with on-line monitoring and maintenance functions, which has the on-line monitoring and maintenance functions and improves the safety margin of the whole steam turbine set on the basis of comprehensively improving the reliability and response speed. But the module consists of four electromagnetic valves in parallel-serial mode, three pressure switches, a pressure transmitter, four plug-in unloading valves, an oil circuit integrated blo