CN109253101B - One-key starting control method after emergency shutdown and normal shutdown of pipeline compressor by pressure relief - Google Patents
One-key starting control method after emergency shutdown and normal shutdown of pipeline compressor by pressure relief Download PDFInfo
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- CN109253101B CN109253101B CN201810959094.3A CN201810959094A CN109253101B CN 109253101 B CN109253101 B CN 109253101B CN 201810959094 A CN201810959094 A CN 201810959094A CN 109253101 B CN109253101 B CN 109253101B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
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Abstract
The invention discloses a one-key starting control method after a pipeline compressor is decompressed and emergently stopped, which comprises the following steps: judging that a one-key starting button is pressed down; judging whether the starting condition is met; starting a lubricating oil main pump and starting an oil mist fan in an interlocking manner; judging whether the pressure of the lubricating oil is normal or not; opening an external sealing gas cut-off valve; carrying out gas replacement; executing a valve sequence control flow; starting a barring motor, enabling the unit to enter a barring state, and judging whether the bearing vibration and the bearing temperature of the unit are normal or not in the barring process; starting the motor; closing the external sealing gas cut-off valve; the one-key starting control method does not need human intervention, greatly improves the automatic control level of the natural gas pipeline compressor, saves human resources, reduces the starting time, and provides reliable technical support for realizing unmanned guard of the gas station in the future.
Description
Technical Field
The invention belongs to the technical field of automatic control of large-scale rotating equipment, is applied to an electrically-driven centrifugal natural gas pipeline compressor unit and aims to realize one-key starting of the electrically-driven centrifugal natural gas pipeline compressor.
Background
In 2016, the national development and modification committee releases a natural gas development plan, the natural gas consumption proportion target is set to be 8.3-10%, and the annual average natural gas consumption is increased by at least 200 billionth of cubic meters. During the natural gas transportation process, a main natural gas trunk and a matched pipeline are newly built for 4 kilometers, the total mileage reaches 10.4 kilometers in 2020, the gas transportation capacity of the main natural gas trunk exceeds 4000 billions per cubic meter per year, a main natural gas transportation mode is that a gas compression station is built every 200 kilometers or so in the pipeline transportation process, natural gas is transported to the downstream by a pressurization method, each natural gas compression station is provided with at least two sets of compressor sets which are arranged in parallel, and the natural gas transportation system can be divided into a fuel drive (a gas turbine drives a pipeline compressor) and an electric drive (a motor drives the pipeline compressor) according to different driving devices. As shown in fig. 1, the typical system components of the electrically-driven pipeline compressor unit mainly include a centrifugal compressor 1, a gear box 2, an electric motor 3, a frequency converter 4, a lubricating oil station 5, a dry gas sealing system 6, a compressor control system UCP7, a motor control center MCC8, valves (such as an inlet cut-off valve 13, a loading valve 14, an anti-surge valve 15, an emergency vent valve 16, an outlet cut-off valve 17, etc.), pipelines, etc., and the working principle is as follows: the motor 3 controls the rotation speed of the centrifugal compressor 1 through the frequency converter 4, so that the natural gas pressure is pressurized to the required pressure. Generally, the upstream air supply amount is not constant, and it is imperative to require frequent (relative) starting and stopping of the centrifugal compressors 1 in the compressor station, and for maintenance of the equipment, it is also often necessary to switch the centrifugal compressors 1 in operation, such as stopping one of the centrifugal compressors 1 at intervals and starting the other. And because the electrically driven pipeline compressor unit involves many auxiliary devices, need each relevant auxiliary device of manual start-up in the process of starting the machine, can start centrifugal compressor 1 after judging all conditions to satisfy by the manual work, this process is wasted time and energy, and has higher requirement to operating personnel operation level.
Disclosure of Invention
The invention aims to provide a one-key starting control method of an electrically-driven centrifugal natural gas pipeline compressor, which can realize one-key starting of the electrically-driven centrifugal natural gas pipeline compressor in different parking modes, saves time and labor and has no professional operation level of corresponding operators.
In order to achieve the purpose, the invention adopts the following scheme to solve the problem:
a one-key starting control method after an emergency stop of a compressor of an electrically-driven centrifugal natural gas pipeline for pressure relief comprises the following steps:
step 1, judging that a one-key starting button is pressed, and entering step 2;
step 2, judging whether the starting condition is met, and if so, entering step 3;
step 3, starting a lubricating oil main pump and starting an oil mist fan in an interlocking manner, and entering step 4;
step 4, judging whether the pressure of the lubricating oil is normal or not, and if so, entering step 5;
step 5, opening the external sealing gas cut-off valve 12, and entering step 6;
step 6, gas replacement is carried out; entering step 7;
step 7, executing a valve sequence control process, and entering step 8;
step 8, starting a barring motor, enabling the unit to enter a barring state, judging whether the bearing vibration and the bearing temperature of the unit are normal or not in the barring process, and if the barring process is free of faults and alarming, entering step 9;
step 9, starting the motor 3;
step 10, closing the external sealing gas cut-off valve 12;
step 11, ending;
in the above steps, when the condition is not satisfied, waiting and judging, if the continuous waiting time exceeds the set longest waiting time or an alarm appears in the starting process, judging that one-key starting fails, and recovering the original state before starting.
Further, the starting conditions in step 2 include:
the pressure of the isolation gas is normal;
the station control system allows starting;
the dry gas sealing system is normal: no fault and no alarm;
the temperature of the lubricating oil is normal;
the inlet cut-off valve and the outlet cut-off valve are in a remote control state;
the lubricating oil standby pump test is normal: and testing whether the lubricating oil standby pump can be started normally.
Further, the gas replacement process of step 6 specifically includes the following operations:
firstly, checking and controlling the required state of each valve before purging, specifically: closing an inlet cut-off valve, closing an outlet cut-off valve, closing an anti-surge valve, closing an inlet loading valve, opening an emergency emptying valve and opening an external sealing gas cut-off valve; then, opening an inlet loading valve and purging a compressor pipeline; opening an anti-surge valve to purge the anti-surge loop; the emergency vent valve is closed.
Further, the valve sequence control process of step 7 specifically includes the following operations:
detecting whether the differential pressure at the two ends of the inlet shut-off valve is less than or equal to 100KPa, if so, opening the inlet shut-off valve and opening the outlet shut-off valve; the inlet loading valve is then closed.
Further, the motor starting process of step 9 specifically includes the following operations:
the UCP sends a 'compressor ready' signal to the frequency converter;
confirming that the frequency converter has no fault and no alarm;
the motor is accelerated to the minimum working speed of the compressor through the frequency converter.
Another object of the present invention is to provide a one-key start control method after a normal stop/pressure-maintaining emergency stop of an electrically driven centrifugal natural gas pipeline compressor, comprising the steps of:
step 1, judging that a one-key starting button is pressed, and entering step 2;
step 2, judging whether the starting condition is met, and if so, entering step 3;
step 3, starting a lubricating oil main pump and starting an oil mist fan in an interlocking manner, and entering step 4;
step 4, judging whether the pressure of the lubricating oil is normal or not, and if so, entering step 5;
step 5, executing valve sequence control; entering step 6;
step 6, starting a barring motor, enabling the unit to enter a barring state, judging whether the bearing vibration and the bearing temperature of the unit are normal or not in the barring process, and entering step 7 if the barring process is free of faults and alarms;
step 7, starting the motor; entering a step 8;
step 8, closing the dry gas sealing external sealing gas cut-off valve;
and 9, ending.
Further, the starting conditions in step 2 include:
the pressure of the isolation gas is normal;
the station control system allows starting;
the dry gas sealing system is normal: no fault and no alarm; opening an external sealing gas cut-off valve;
the temperature of the lubricating oil is normal;
the inlet cut-off valve and the outlet cut-off valve are in a remote control state;
the lubricating oil standby pump test is normal: and testing whether the lubricating oil standby pump can be started normally.
Further, the valve sequence control process of step 5 specifically includes the following operations:
detecting whether the differential pressure at the two ends of the inlet cut-off valve is less than or equal to 100KPa or not; if yes, opening an inlet cut-off valve and an outlet cut-off valve; the inlet loading valve is then closed.
Further, the motor starting process of step 7 specifically includes the following operations:
the UCP sends a 'compressor ready' signal to the frequency converter;
confirming that the frequency converter has no fault and no alarm;
the motor is accelerated to the minimum working speed of the compressor through the frequency converter.
Compared with the prior art, the invention has the following advantages:
the invention realizes that the unit automatically starts/controls each auxiliary device (such as a lubricating oil pump, a dry gas seal and a process valve) to a set state after a start button is pressed, and sends a start permission signal to the frequency converter through the UCP7 of the compressor control system after all start conditions are automatically judged to be met, and the frequency converter directly starts the motor, namely, the one-key start of the whole process of the electrically-driven pipeline compressor is realized. The one-key starting process does not need human intervention, greatly improves the automatic control level of the natural gas pipeline compressor, saves human resources, reduces the starting time, and provides reliable technical support for realizing unmanned guard of the gas station in the future.
Drawings
FIG. 1 is a system diagram of an electrically driven centrifugal natural gas pipeline compressor train;
fig. 2 is a flowchart of a one-key start control method after the compressor 1 is depressurized and emergently stopped;
fig. 3 is a logic diagram of a compressor 1 replacement procedure;
FIG. 4 is a logic diagram for valve sequencing for compressor 1;
fig. 5 is a flowchart of a one-key start control method after the compressor 1 is normally stopped/pressure-maintaining emergency stopped.
The invention is further explained below with reference to the drawings and the detailed description.
Detailed Description
The invention provides a control method suitable for one-key starting on the basis of researching the process principle of an electrically-driven pipeline compressor. In order to realize one-key starting of the unit, an external sealing gas cut-off valve 12 is additionally arranged on an external sealing gas pipeline of the unit (compared with the conventional manual starting), and the barring motor 201 adopts an automatic engagement and automatic disengagement mode. In order to ensure the reliability of one-key starting, the invention adds a self-checking program of important equipment before starting, such as a lubricating oil pump test program, aims at various problems possibly encountered in the one-key starting process and perfects the starting logic.
According to the difference of the last shutdown mode, the one-key startup is divided into two types: 1. the compressor is started after the emergency stop under the pressure relief; 2. the compressor is started after normal stop/pressure maintaining emergency stop. The specific one-key starting process is described below according to the different starting conditions 1 and 2.
One-key starting after compressor 1 pressure relief emergency stop
As shown in fig. 2, the method for controlling the one-key start after the compressor 1 is depressurized and emergently stopped according to the embodiment includes the following steps:
(1) it is determined that a one-key start button (from HMI start button, UCP7 cabinet or remote start button) is pressed. Entering the step (2);
(2) judging whether the following starting conditions are all met, and if so, entering the step (3);
the pressure of the isolation gas is normal: the pressure is more than 300KPa and is kept for 15 min;
the station control system allows starting;
the dry gas sealing system 6 is normal: no fault and no alarm;
the temperature of the lubricating oil is normal: 35-40 ℃. If the temperature is not in the range, entering an oil temperature control program: the oil temperature is controlled by the lubricating oil electric heater 503 and the lubricating oil station air cooler 11 together, so that the temperature is kept at 35-40 ℃.
The inlet cut-off valve 13 and the outlet cut-off valve 17 are in a remote control state;
the oil backup pump 502 tests normal: the lube backup pump 502 is tested for normal start.
(3) Starting the lubricating oil main pump 501, locking and starting the oil mist fan 504 in parallel, and entering the step (4);
(4) judging whether the pressure of the lubricating oil is normal or not, and if so, entering the step (5);
(5) opening an external sealing gas cut-off valve 12, and entering the step (6);
(6) carrying out gas replacement; as shown in fig. 3, the method specifically includes the following operations:
firstly, checking and controlling the required state of each valve before purging, specifically: the inlet cut-off valve 13 is closed, the outlet cut-off valve 17 is closed, the anti-surge valve 15 is closed, the inlet loading valve 14 is closed, the emergency vent valve 16 is opened, and the external seal gas cut-off valve 12 is opened; then, opening the inlet loading valve 14, purging the compressor pipeline for 30 min; opening an anti-surge valve 15, purging an anti-surge loop, and continuing purging for 30 min; closing the emergency vent valve 16; at this point, the replacement flow ends, and the process proceeds to step (7).
(7) And (5) executing a valve sequence control flow, and entering the step (8). The valve sequence control flow is shown in fig. 4, and specifically includes the following operations:
detecting whether the differential pressure at two ends of the inlet shut-off valve 13 is less than or equal to 100KPa, if so, opening the inlet shut-off valve 13 and opening the outlet shut-off valve 17; the inlet loading valve 14 is then closed;
(8) starting a barring motor 201, enabling the unit to enter a barring state, enabling barring to continue for 15min, judging whether bearing vibration and bearing temperature of the unit are normal (not exceeding a set value) in the barring process, and entering step (9) if no fault or alarm exists in the barring process.
(9) The motor 3 is started. The method specifically comprises the following operations:
UCP7 sends a "compressor ready" signal to inverter 4;
confirming that the frequency converter 4 has no fault and no alarm;
the motor 3 is accelerated to the minimum operating speed of the compressor 1 (typically 65% of the rated speed) by the inverter 4.
(10) The external sealing gas cut-off valve 12 is closed to cut off the sealing gas;
(11) and ending the one-key start after the compressor 1 is decompressed and emergently stopped.
It should be noted that the one-key start control method is sequential control, and can be executed in the next step only when the condition is satisfied, and when the condition is not satisfied, the one-key start control method waits and determines at the current node, and if the continuous waiting time exceeds the set maximum waiting time or an alarm occurs in the starting process (for example, an alarm occurs in the turning process), it is determined that the one-key start fails, and all the auxiliary devices are restored to the original state before the start. At the same time, the reason for the failed start-up is displayed on the HMI for the operator to repair the associated malfunctioning device.
Secondly, one-key starting after normal stopping/pressure maintaining emergency stopping of the compressor 1
As shown in fig. 5, the method for controlling one-key start after normal stop/pressure maintaining emergency stop of the compressor 1 provided in this embodiment includes the following steps:
(1) judging that a one-key starting button (from an HMI starting button, a UCP7 cabinet or a remote starting button) is pressed, and entering the step (2);
(2) judging whether the following starting conditions are all met, and if so, entering the step (3);
the pressure of the isolation gas is normal: the pressure is more than 300KPa and is kept for 15 min;
the station control system allows starting;
the dry gas sealing system 6 is normal: no fault and no alarm; the external seal gas cut-off valve 12 is opened;
the temperature of the lubricating oil is normal: 35-40 ℃. If the temperature is not in the range, entering an oil temperature control program: byThe lubricating oil electric heater 503 and the lubricating oil station air cooler 11 jointly control the oil temperature to keep the temperature at 35-40 ℃.
The inlet cut-off valve 13 and the outlet cut-off valve 17 are in a remote control state;
the oil backup pump 502 tests normal: the lube backup pump 502 is tested for normal start.
(3) Starting the lubricating oil main pump 501, locking and starting the oil mist fan 504 in parallel, and entering the step (4);
(4) judging whether the pressure of the lubricating oil is normal or not, and if so, entering the step (5);
(5) executing a valve sequence control flow; entering the step (6); the valve sequence control flow is shown in fig. 4, and specifically includes the following operations:
detecting whether the differential pressure at two ends of the inlet cut-off valve 13 is less than or equal to 100 KPa; if yes, the inlet shut-off valve 13 is opened, and the outlet shut-off valve 17 is opened; the inlet loading valve 14 is then closed;
(6) starting a barring motor 201, enabling the unit to enter a barring state, enabling the barring to continue for 15min, automatically judging whether the vibration of a bearing, the temperature of the bearing and the like of the unit are normal (the vibration and the temperature of the bearing do not exceed set values) in the barring process by a program, and entering step (7) if no fault or alarm exists in the barring process.
(7) Starting the motor 3; entering a step 8; the motor starting process specifically comprises the following operations:
UCP7 sends a "compressor ready" signal to inverter 4;
confirming that the frequency converter 4 has no fault and no alarm;
the motor 3 is accelerated to the minimum operating speed of the compressor 1 (typically 65% of the rated speed) by the inverter 4.
(8) The dry gas sealing external sealing gas cut-off valve 12 is closed to cut off the sealing gas;
(9) the one-key start process after the normal stop/pressure maintaining emergency stop of the compressor 1 is ended.
It should be noted that, after the normal parking/pressure maintaining emergency parking, the dry gas sealing external sealing gas cut-off valve 12 is always in an open state, and meanwhile, gas replacement is not required when starting after the normal parking/pressure maintaining emergency parking.
The one-key starting method of the electrically-driven natural gas pipeline compressor has good effect through communication discussion and perfection with several famous pipe design houses and middle oil experts in China and verification in the project of the pipeline compressor at the middle oil carine station. The application of the one-key starting control method greatly improves the automatic control level of the pipeline compressor, reduces the requirement on the capability of an operator, greatly shortens the starting time of the compressor, saves the energy consumption (electric energy), and generates great direct and indirect economic benefits. The invention realizes the one-key start of the domestic electric drive pipeline compressor in the true sense, lays solid technical support for realizing the unattended operation of the whole gas station, and can be popularized to the start process of similar units, thereby having good popularization value.
Claims (9)
1. A one-key starting control method after emergency shutdown of pipeline compressor pressure relief is characterized by comprising the following steps:
step 1, judging that a one-key starting button is pressed, and entering step 2;
step 2, judging whether the starting condition is met, and if so, entering step 3;
step 3, starting a lubricating oil main pump and starting an oil mist fan in an interlocking manner, and entering step 4;
step 4, judging whether the pressure of the lubricating oil is normal or not, and if so, entering step 5;
step 5, opening an external sealing gas cut-off valve, and entering step 6;
step 6, gas replacement is carried out; entering step 7;
step 7, executing a valve sequence control process, and entering step 8;
step 8, starting a barring motor, enabling the unit to enter a barring state, judging whether the bearing vibration and the bearing temperature of the unit are normal or not in the barring process, and if the barring process is free of faults and alarming, entering step 9;
step 9, starting the motor;
step 10, closing the external sealing gas cut-off valve;
step 11, ending;
in the above steps, when the condition is not satisfied, waiting and judging, if the continuous waiting time exceeds the set longest waiting time or an alarm appears in the starting process, judging that one-key starting fails, and recovering the original state before starting.
2. The one-key start control method of a line compressor after an emergency stop with pressure relief as set forth in claim 1, wherein said start condition in step 2 includes:
the pressure of the isolation gas is normal;
the station control system allows starting;
the dry gas sealing system is normal: no fault and no alarm;
the temperature of the lubricating oil is normal;
the inlet cut-off valve and the outlet cut-off valve are in a remote control state;
the lubricating oil standby pump is tested normally: and testing whether the lubricating oil standby pump can be started normally.
3. The method for controlling one-touch start after emergency stop of pipeline compressor pressure relief according to claim 1, wherein the gas replacement process of step 6 specifically comprises the following operations:
firstly, checking and controlling the required state of each valve before purging, specifically: closing an inlet cut-off valve, closing an outlet cut-off valve, closing an anti-surge valve, closing an inlet loading valve, opening an emergency emptying valve and opening an external sealing gas cut-off valve; then, opening an inlet loading valve and purging a compressor pipeline; opening an anti-surge valve to purge the anti-surge loop; the emergency vent valve is closed.
4. The method for one-touch start control after emergency shutdown of pipeline compressor relief as claimed in claim 1 wherein said valve sequence control flow of step 7 specifically comprises the operations of:
detecting whether the differential pressure at the two ends of the inlet shut-off valve is less than or equal to 100KPa, if so, opening the inlet shut-off valve and opening the outlet shut-off valve; the inlet loading valve is then closed.
5. The method for controlling one-key start after emergency stop of pipeline compressor pressure relief according to claim 1, wherein the motor start procedure of step 9 specifically comprises the following operations:
the UCP sends a 'compressor ready' signal to the frequency converter;
confirming that the frequency converter has no fault and no alarm;
the motor is accelerated to the minimum working speed of the compressor through the frequency converter.
6. A one-key starting control method after normal parking/pressure maintaining emergency parking of a pipeline compressor is characterized by comprising the following steps:
step 1, judging that a one-key starting button is pressed, and entering step 2;
step 2, judging whether the starting condition is met, and if so, entering step 3;
step 3, starting a lubricating oil main pump and starting an oil mist fan in an interlocking manner, and entering step 4;
step 4, judging whether the pressure of the lubricating oil is normal or not, and if so, entering step 5;
step 5, executing valve sequence control; entering step 6;
step 6, starting a barring motor, enabling the unit to enter a barring state, judging whether the bearing vibration and the bearing temperature of the unit are normal or not in the barring process, and entering step 7 if the barring process is free of faults and alarms;
step 7, starting the motor; entering a step 8;
step 8, closing the dry gas sealing external sealing gas cut-off valve;
and 9, ending.
7. The one-touch start-up control method after normal stop/dwell emergency stop of a pipeline compressor as claimed in claim 6, wherein said start-up conditions in step 2 include:
the pressure of the isolation gas is normal;
the station control system allows starting;
the dry gas sealing system is normal: no fault and no alarm; opening an external sealing gas cut-off valve;
the temperature of the lubricating oil is normal;
the inlet cut-off valve and the outlet cut-off valve are in a remote control state;
the lubricating oil standby pump is tested normally: and testing whether the lubricating oil standby pump can be started normally.
8. The method for one-touch start control after normal stop/pressure-maintaining emergency stop of pipeline compressor as claimed in claim 6, wherein said valve sequence control procedure of step 5 specifically comprises the following operations:
detecting whether the differential pressure at the two ends of the inlet cut-off valve is less than or equal to 100KPa or not; if yes, opening an inlet cut-off valve and an outlet cut-off valve; the inlet loading valve is then closed.
9. The method for controlling one-touch start after normal stop/pressure maintaining emergency stop of pipeline compressor as claimed in claim 6, wherein the motor start procedure of step 7 specifically comprises the following operations:
the UCP sends a 'compressor ready' signal to the frequency converter;
confirming that the frequency converter has no fault and no alarm;
the motor is accelerated to the minimum working speed of the compressor through the frequency converter.
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| CN201810959094.3A CN109253101B (en) | 2018-08-22 | 2018-08-22 | One-key starting control method after emergency shutdown and normal shutdown of pipeline compressor by pressure relief |
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| CN109989908A (en) * | 2019-04-25 | 2019-07-09 | 沈阳鼓风机集团自动控制系统工程有限公司 | Starting method, apparatus, storage medium and the computer equipment of compressor |
| CN111140526A (en) * | 2019-12-18 | 2020-05-12 | 沈阳透平机械股份有限公司 | Shutdown method and device of centrifugal compressor, storage medium and computer equipment |
| CN112127963B (en) * | 2020-08-25 | 2022-04-05 | 潍柴动力股份有限公司 | Engine, engine starting system, starting method and lubricating oil path cleaning method |
| CN112783114A (en) * | 2020-12-09 | 2021-05-11 | 万华化学(宁波)氯碱有限公司 | Method and system for one-key starting hydrogen pump sequential control of hydrogen water-ring compressor |
| CN113374680B (en) * | 2021-06-18 | 2022-05-06 | 国家石油天然气管网集团有限公司西气东输分公司 | Compressor unit combined operation control method and system |
| CN113719444B (en) * | 2021-09-16 | 2023-09-22 | 国家石油天然气管网集团有限公司 | Automatic jigger control system and method under pressure release state of compressor unit |
| CN114637225A (en) * | 2022-03-11 | 2022-06-17 | 云南曲靖钢铁集团凤凰钢铁有限公司 | Control system of seamless steel pipe that can stop rapidly |
| CN115013348B (en) * | 2022-07-28 | 2023-10-20 | 西安陕鼓动力股份有限公司 | One-key shutdown control method for electric drive centrifugal compressor unit |
| CN115167328A (en) * | 2022-09-08 | 2022-10-11 | 浙江中控技术股份有限公司 | Energy distribution and transmission control method and device |
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