CN214305285U - Online adjusting system for hydrogen differential pressure of sealing oil in power plant - Google Patents
Online adjusting system for hydrogen differential pressure of sealing oil in power plant Download PDFInfo
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- CN214305285U CN214305285U CN202120236121.1U CN202120236121U CN214305285U CN 214305285 U CN214305285 U CN 214305285U CN 202120236121 U CN202120236121 U CN 202120236121U CN 214305285 U CN214305285 U CN 214305285U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02P90/45—Hydrogen technologies in production processes
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Abstract
The utility model provides an online adjustment system of power plant sealing oil hydrogen differential pressure, includes sealed oil pump, vacuum oil tank, sealed oil cooler, first governing valve, second governing valve, generator, hydrogen side oil return case, oil supply pressure transmitter, hydrogen side oil return pressure transmitter, online control unit. The oil supply pressure transmitter is arranged on a generator sealing oil supply pipeline, the hydrogen side oil return pressure transmitter is arranged on a hydrogen side oil return pipeline, the oil supply pressure transmitter and the hydrogen side oil return pressure transmitter are connected with an online control unit input module, the online control unit collects real-time pressure values and compares the real-time pressure values with a differential pressure value set by an operator, the opening degree of an oil-hydrogen differential pressure regulating valve is output through PID (proportion integration differentiation) operation of a calculation module, an instruction signal is acted on the differential pressure regulating valve through an output module, and the actual value of the oil-hydrogen differential pressure is ensured to be consistent with a set value of the differential pressure. The system is simple to operate, accurate to control and strong in reliability.
Description
Technical Field
The utility model relates to a sealed oil system technical field of power plant, in particular to sealed oily hydrogen differential pressure online adjustment system of power plant.
Background
The main function of the sealing oil system of the thermal power plant is to supply oil to the generator sealing tile, and the oil pressure is higher than the hydrogen pressure in the generator by a certain value, so that the hydrogen with pressure in the generator is prevented from overflowing from the shaft diameter of the motor, and the control of the hydrogen differential pressure of the sealing oil is related to the safe and stable operation of the unit.
At present, a thermal power generating unit generally adopts an on-site diaphragm type oil-hydrogen differential pressure valve to control the oil-hydrogen differential pressure of the unit, the on-site oil-hydrogen differential pressure valve returns oil from a hydrogen side for sampling, the oil return pressure is used as the hydrogen pressure, the sum of the hydrogen pressure and the spring force is compared with the sealing oil pressure, when the pressure difference exists, the opening degree of a valve port is influenced until the pressure balance is reached, and an operator needs to adjust the differential pressure value through adjusting the spring. The regulation of differential pressure regulating valve on the spot needs operating personnel to possess certain technical merit, and manual regulation process need steadily accurate and adjustment time long, and differential pressure valve sampling pipeline is all the way on the spot in addition, and it is unable stable control to probably take place sampling pipeline problem or valve body mechanical problem when the unit long time operation leads to oil hydrogen differential pressure.
Disclosure of Invention
In order to overcome above-mentioned prior art not enough, the utility model aims to provide an online adjustment system of sealed oily hydrogen differential pressure of power plant, this system can realize operating personnel at DCS remote automatic adjustment oily hydrogen differential pressure, sealed oil pressure and hydrogen side pressure are independent measurement and redundant configuration respectively, prevent that single measurement station trouble from influencing the system operation, the required oily hydrogen differential pressure value can be set for from the DCS picture to the operating personnel, online adjustment system can be according to setting value automatically regulated oily hydrogen differential pressure, the system is easy to operate, control is accurate and the good reliability.
In order to realize the purpose, the utility model discloses a technical scheme is:
a power plant sealed oil hydrogen differential pressure online adjusting system comprises a vacuum oil tank 2, wherein an oil supply loop for sealed oil is formed from an outlet of the vacuum oil tank 2 to an oil supply inlet of a generator 6;
an outlet at the bottom of the vacuum oil tank 2 is connected with an inlet of a sealing oil pump 1, an outlet of the sealing oil pump 1 is connected with an inlet of a sealing oil cooler 3, an outlet of the sealing oil cooler 3 is connected with an inlet of a first regulating valve 4, a second regulating valve 5 is arranged on the side of the first regulating valve 4 in parallel, an inlet pipeline of the first regulating valve 4 is connected with an inlet of the second regulating valve 5, an outlet pipeline of the first regulating valve 4 is connected with an outlet 5 of the second regulating valve, an outlet main pipe of the first regulating valve 4 and the second regulating valve 5 is connected with an oil supply inlet of a generator 6, and an oil supply pressure transmitter 8 is arranged from an outlet main pipe of the first regulating valve 4 and the second regulating valve 5 to an inlet oil supply pipeline of the generator 6;
the oil return outlet at the hydrogen side of the generator 6 to the vacuum oil tank 2 is a sealed oil hydrogen side oil return loop;
a hydrogen side oil return outlet of the generator 6 is connected with the upper part of the side surface of the hydrogen side oil return tank 7, an outlet of the hydrogen side oil return tank 7 is connected with an inlet at the upper part of the side surface of the vacuum oil tank 2, and a hydrogen side oil return pressure transmitter 9 is arranged between the hydrogen side oil return outlet of the generator 6 and a pipeline of the hydrogen side oil return tank 7;
the oil supply pressure transmitter 8 and the hydrogen side oil return pressure transmitter 9 are connected with an online control unit 10, and the output of the online control unit 10 is respectively connected with the first regulating valve 4 and the second regulating valve 5.
The number of the oil supply pressure transmitters 8 is three, and the signal sampling pipelines of the three oil supply pressure transmitters 8 are independent respectively.
The number of the hydrogen side oil return pressure transmitters 9 is three, and the signal sampling pipelines of the three hydrogen side oil return pressure transmitters 9 are independent respectively.
The first regulating valve 4 is provided with a first stop valve 11 and a second stop valve 12 in front and at the back.
The second regulating valve 5 is provided with a third stop valve 13 and a fourth stop valve 14 in front and at the back.
The online control unit 10 comprises an input module, a calculation module and an output module, the online control unit 10 is realized by adopting a DCS control system, the input module is realized by a DCS analog quantity input clamping piece, the calculation module is realized by a DCS control logic function block, and the output module is realized by a DCS analog quantity output clamping piece.
An operation method of a power plant sealing oil hydrogen differential pressure on-line adjusting system comprises the following steps;
the online control unit 10 collects real-time values of the oil supply pressure transmitter 8 and the hydrogen side oil return pressure transmitter 9 through the input module, an operator manually inputs a required differential pressure set value, the calculation module compares the pressure difference between the oil supply pressure transmitter 8 and the hydrogen side oil return pressure transmitter 9 with the differential pressure set value, and outputs a differential pressure regulating valve instruction through PID operation, namely when the pressure difference between the sealing oil supply pressure and the hydrogen side oil return pressure is smaller than the differential pressure set value, the opening of the differential pressure regulating valve is increased, and when the pressure difference between the sealing oil supply pressure and the hydrogen side oil return pressure is larger than the differential pressure set value, the opening of the differential pressure regulating valve is decreased, so that the actual oil hydrogen differential pressure value is consistent with the differential pressure set value.
The utility model has the advantages that:
power plant sealing oil hydrogen differential pressure online adjustment system and method, when concrete operation, sealing oil supply pressure transmitter and hydrogen side return pressure transmitter adopt the multiple spot configuration and the sample is independent, arbitrary measurement station trouble can not influence the system operation, the operation personnel can directly set up oil hydrogen differential pressure setting value, compare with the sealing oil supply pressure that the on-line control unit gathered and hydrogen side return pressure's difference, the calculation unit passes through PID operation output differential pressure governing valve instruction, and act on differential pressure governing valve, finally make actual oil hydrogen differential pressure value unanimous with the differential pressure setting value. Meanwhile, the oil-hydrogen differential pressure valve adopts a parallel standby mode, and one regulating valve can be switched to the other regulating valve for on-line control when the regulating valve fails. The system can realize direct control of the oil-hydrogen differential pressure by operating personnel at the DCS, and has the advantages of simple operation, accurate control and strong reliability.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a sealed oil pump, 2 is a vacuum oil tank, 3 is a sealed oil cooler, 4 is a first differential pressure regulating valve, 5 is a second differential pressure regulating valve, 6 is a generator, 7 is a hydrogen side oil return tank, 8 is an oil supply pressure transmitter, 9 is a hydrogen side oil return pressure transmitter, 10 is an online control unit, 11 is a first stop valve, 12 is a second stop valve, 13 is a third stop valve, and 14 is a fourth stop valve.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the system for adjusting the hydrogen differential pressure of the sealing oil in the power plant according to the present invention includes a sealing oil pump 1, a vacuum oil tank 2, a sealing oil cooler 3, a first regulating valve 4, a second regulating valve 5, a generator 6, a hydrogen-side oil return tank 7, an oil supply pressure transmitter 8, a hydrogen-side oil return pressure transmitter 9, and an online control unit 10;
a sealed oil supply loop is formed from the outlet of the vacuum oil tank 2 to the oil supply inlet of the generator 6, the outlet at the bottom of the vacuum oil tank 2 is connected with the inlet of a sealed oil pump 1, the outlet of the sealed oil pump 1 is connected with the inlet of a sealed oil cooler 3, the outlet of the sealed oil cooler 3 is connected with the inlet of a first regulating valve 4, a second regulating valve 5 is connected with the first regulating valve 4 in parallel, the inlet pipeline of the first regulating valve 4 is connected with the inlet of the second regulating valve 5, the outlet pipeline of the first regulating valve 4 is connected with the outlet of the second regulating valve 5, the outlet main pipe of the first regulating valve 4 and the second regulating valve 5 is connected with the oil supply inlet of the generator 6, and three oil supply pressure transmitters 8 are arranged on the oil supply pipelines from the outlet main pipe of the first regulating valve 4 and the second regulating valve 5 to the inlet of the generator;
a sealed oil hydrogen side oil return loop is formed from a hydrogen side oil return outlet of the generator 6 to an oil return inlet of the vacuum oil tank 2, the hydrogen side oil return outlet of the generator 6 is connected with the upper part of the side surface of the hydrogen side oil return tank 7, an outlet of the hydrogen side oil return tank 7 is connected with an inlet of the upper part of the side surface of the vacuum oil tank 2, and three hydrogen side oil return pressure transmitters 9 are arranged between the hydrogen side oil return outlet of the generator 6 and a pipeline of the hydrogen side oil return tank 7;
the oil supply pressure transmitter 8 and the hydrogen side return oil pressure transmitter 9 are connected with an online control unit 10, and the output of the online control unit 10 is respectively connected with the first regulating valve 4 and the second regulating valve 5.
The signal sampling pipelines of the three oil supply pressure transmitters 8 are respectively independent.
The signal sampling pipelines of the three hydrogen side oil return pressure transmitters 9 are respectively independent.
The first regulating valve 4 is provided with a first stop valve 11 and a second stop valve 12 in front and at the back, and the front and the back stop valves can be closed for isolated maintenance when the first regulating valve 4 breaks down.
The second governing valve 5 is provided with third stop valve 13 and fourth stop valve 14 in front and back, can close front and back stop valve and keep apart when second governing valve 5 breaks down and overhaul.
One path of the first regulating valve 4 and the second regulating valve 5 works normally, the other path of the first regulating valve and the second regulating valve are used for standby, and one regulating valve can be switched to the other path of the first regulating valve to work when in fault.
The generator sealing oil system adopts a single-flow ring type sealing tile.
The online control unit 10 includes an input module, a calculation module, and an output module.
The online control unit 10 is realized by adopting a DCS control system, the input module is realized by a DCS system analog quantity input clamping piece, the calculation module is realized by a DCS control logic functional block, and the output module is realized by a DCS system analog quantity output clamping piece.
The online control unit 10 collects real-time values of the oil supply pressure transmitter 8 and the hydrogen side oil return pressure transmitter 9 through the input module, an operator manually inputs a required differential pressure set value, the calculation module compares the pressure difference between the oil supply pressure transmitter 8 and the hydrogen side oil return pressure transmitter 9 with the differential pressure set value, and outputs a differential pressure regulating valve instruction through PID operation, namely when the pressure difference between the sealing oil supply pressure and the hydrogen side oil return pressure is smaller than the differential pressure set value, the opening of the differential pressure regulating valve is increased, and when the pressure difference between the sealing oil supply pressure and the hydrogen side oil return pressure is larger than the differential pressure set value, the opening of the differential pressure regulating valve is decreased, so that the actual oil hydrogen differential pressure value is consistent with the differential pressure set value.
The utility model discloses a concrete working process does:
when the sealing oil system operates, the sealing oil pump 1 conveys the sealing oil of the vacuum oil tank 2 to the generator 6 sealing tile, the sealing oil sequentially passes through the sealing oil cooler 3 and the differential pressure regulating valve, the first regulating valve 4 is in a working state, the front stop valve and the rear stop valve are opened, the second regulating valve 5 is in a standby closing state, the front stop valve and the rear stop valve are opened, and the hydrogen side return oil of the generator 6 returns to the hydrogen side oil return tank 7;
three redundant oil supply pressure transmitters 8 on a sealed oil pipeline and three redundant hydrogen side oil return pressure transmitters 9 on a hydrogen side oil return pipeline send pressure signals to an input module of an online control unit 10, the input module of the online control unit 10 collects real-time pressure values of the transmitters, a current actual oil hydrogen differential pressure value is calculated through a calculation module and is compared with an oil hydrogen differential pressure value set by an operator, and an opening instruction of a first regulating valve is output through PID calculation of the calculation module, namely when the sealed oil supply pressure and the hydrogen side oil return pressure difference value are smaller than a differential pressure set value, the opening of the differential pressure regulating valve is increased, and when the sealed oil supply pressure and the hydrogen side oil return pressure difference value are larger than the differential pressure set value, the opening of the differential pressure regulating valve is decreased, so that the actual oil hydrogen differential pressure value is consistent with the differential pressure set value.
When the first control valve 4 fails, the second control valve 5 is switched to control the oil-hydrogen differential pressure, the front and rear shutoff valves of the first control valve 4 are closed, and the on-line control unit 10 outputs a command to switch from the first control valve 4 to the second control valve 5.
In addition, three sealing oil supply pressures and three hydrogen side oil return pressures are calculated by adopting a three-taking median value, and when one point fails, the remaining two points are averaged.
Claims (7)
1. An on-line adjusting system for hydrogen differential pressure of sealed oil in a power plant is characterized by comprising a vacuum oil tank (2), an outlet at the bottom of the vacuum oil tank (2) is connected with an inlet of a sealed oil pump (1), an outlet of the sealed oil pump (1) is connected with an inlet of a sealed oil cooler (3), an outlet of the sealed oil cooler (3) is connected with an inlet of a first regulating valve (4), a second regulating valve (5) is arranged on the side of the first regulating valve (4) in parallel, an inlet pipeline of the first regulating valve (4) is connected with an inlet of the second regulating valve (5), an outlet pipeline of the first regulating valve (4) is connected with an outlet of the second regulating valve (5), an outlet main pipe of the first regulating valve (4) and the second regulating valve (5) is connected with an oil supply inlet of a generator (6), and an oil supply pressure transmitter (8) is arranged on an outlet main pipe of the first regulating valve (4) and the second regulating valve (5) to an inlet oil supply pipeline of the generator (6);
a hydrogen side oil return outlet of the generator (6) is connected with the upper part of the side surface of the hydrogen side oil return box (7), an outlet of the hydrogen side oil return box (7) is connected with an inlet at the upper part of the side surface of the vacuum oil tank (2), and a hydrogen side oil return pressure transmitter (9) is arranged between the hydrogen side oil return outlet of the generator (6) and a pipeline of the hydrogen side oil return box (7);
the oil supply pressure transmitter (8) and the hydrogen side oil return pressure transmitter (9) are connected with the online control unit (10), and the output of the online control unit (10) is respectively connected with the first regulating valve (4) and the second regulating valve (5).
2. The power plant sealing oil hydrogen differential pressure online adjusting system according to claim 1, characterized in that the outlet of the vacuum oil tank (2) to the oil supply inlet of the generator (6) is a sealing oil supply loop; and an oil return outlet at the hydrogen side of the generator (6) to the vacuum oil tank (2) is a sealed oil hydrogen side oil return loop.
3. The power plant sealing oil hydrogen differential pressure online adjusting system according to claim 1, characterized in that the number of the oil supply pressure transmitters (8) is three, and signal sampling pipelines of the three oil supply pressure transmitters (8) are independent respectively.
4. The power plant sealing oil-hydrogen differential pressure online adjusting system according to claim 1, wherein the number of the hydrogen-side return oil pressure transmitters (9) is three, and signal sampling pipelines of the three hydrogen-side return oil pressure transmitters (9) are independent.
5. The power plant sealing oil-hydrogen differential pressure online adjusting system according to claim 1, characterized in that the first regulating valve (4) is provided with a first stop valve (11) and a second stop valve (12) in front and at the back.
6. The power plant sealing oil-hydrogen differential pressure online adjusting system according to claim 1, characterized in that the second regulating valve (5) is provided with a third stop valve (13) and a fourth stop valve (14) in front and at the back.
7. The system for adjusting the hydrogen differential pressure of the sealing oil in the power plant according to the claim 1, wherein the online control unit (10) comprises an input module, a calculation module and an output module, the online control unit (10) is realized by a DCS control system, the input module is realized by a DCS analog input card, the calculation module is realized by a DCS control logic function block, and the output module is realized by a DCS analog output card.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120236121.1U CN214305285U (en) | 2021-01-28 | 2021-01-28 | Online adjusting system for hydrogen differential pressure of sealing oil in power plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120236121.1U CN214305285U (en) | 2021-01-28 | 2021-01-28 | Online adjusting system for hydrogen differential pressure of sealing oil in power plant |
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| CN214305285U true CN214305285U (en) | 2021-09-28 |
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| CN202120236121.1U Active CN214305285U (en) | 2021-01-28 | 2021-01-28 | Online adjusting system for hydrogen differential pressure of sealing oil in power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114060846A (en) * | 2021-11-02 | 2022-02-18 | 中国船舶重工集团公司第七0三研究所 | Pressure control method for boiler fuel oil main pipe |
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2021
- 2021-01-28 CN CN202120236121.1U patent/CN214305285U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114060846A (en) * | 2021-11-02 | 2022-02-18 | 中国船舶重工集团公司第七0三研究所 | Pressure control method for boiler fuel oil main pipe |
| CN114060846B (en) * | 2021-11-02 | 2024-05-17 | 中国船舶重工集团公司第七0三研究所 | Boiler fuel oil main pipe pressure control method |
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