Compressor unit control system with one-key start-stop function and control method

Abstract

The invention discloses a compressor unit control system with a one-key start and stop function and a control method. The compressor unit control system comprises an intelligent control system, a steam system, an oil system, a condensate system, a dry gas sealing system, a vacuum system and a public engineering system. The intelligent control system is integrated with a DCS (Distributed Control System) monitoring system, the steam system comprises a warm-up program and an air seal steam application program, the oil system comprises an oil circulation establishing program, the condensate system comprises a condensate circulation establishing program, and the dry gas seal system comprises a rear isolation air seal application program, a first-stage seal application program and a second-stage seal application program. The public engineering system comprises a circulating water application program, a desalted water application program, a nitrogen application program, a unit isolation air application program and PID control modules corresponding to system control valves; according to the invention, personal injury, equipment damage and environmental hazard caused by accidental abnormity in the starting and stopping process are reduced, complete intelligence of a unit control system is realized, the labor cost is reduced, and the safety and economical efficiency of device operation are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of intelligent control of compressor unit, in particular to a compressor unit control system and control method with one-key start-stop function. BACKGROUND

[0002] At present, the driving modes of compressor unit include steam driving and electric driving, the electric driving mode is close to one-key start-stop mode, the steam driving unit includes vacuum system, steam system, oil circuit system, steam condensate system, dry gas seal system, vacuum system and public system, each system is independently started, and the next level system can be started after the process condition of the previous level system is met.

[0003] The compressor unit control system currently adopts ITCC system control, and the intelligent control system is mainly used in anti-surge control module, domestic units mainly adopt anti-surge automatic, semi-automatic and manual control, and foreign CCC control system adopts self-adjusting logic control system with independent intellectual property rights, which can realize energy saving of 15-20% compared with manual control, but there is no one-key automatic control method for independent steam system, oil circuit system, steam condensate system, dry gas seal system, vacuum system and public system. SUMMARY

[0004] The present application aims to overcome the above-mentioned deficiencies, and provides a compressor unit control system and control method with one-key start-stop function, which reduces personal injury, equipment damage and environmental hazards caused by occasional abnormalities in the process of starting and stopping, realizes complete intelligentization of the unit control system, reduces labor cost, and improves the safety and economy of device operation.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is: a compressor unit control system with one-key start-stop function, comprising an intelligent control system, a steam system, an oil system, a condensate system, a dry gas seal system, a vacuum system and a public engineering system; the intelligent control system integrates a DCS monitoring system, the steam system includes a warm-up program and a gas seal steam commissioning program, the oil system includes an oil circulation program, the condensate system includes a condensate circulation program, the dry gas seal system includes a post-isolation gas seal commissioning program, a primary seal commissioning program and a secondary seal commissioning program, and the public engineering system includes a circulating water commissioning program, a desalted water commissioning program, a nitrogen commissioning program, a unit isolation air commissioning program and a PID control module corresponding to each system control valve.

[0006] Preferably, the intelligent control system comprises an execution unit, a display unit, a logic control unit, and is divided into a one-key start main program control module and a one-key stop main program control module; the logic control unit comprises a DCS processing unit, an input / output card, and a communication card; a communication network of the DCS monitoring system is divided into two layers, an upper layer is an upper computer operation network, used for data exchange and communication of an operation layer and a server and an operator station, system configuration and information are stored in a main server, and a lower layer is a process data network layer, composed of a plurality of process controllers, to realize decentralized control.

[0007] Preferably, the warm-up structure of the steam system comprises a warm-up control structure, which comprises a first steam valve, a second steam valve, a quick closing valve and an adjusting air valve connected in sequence, and further comprises a first steam valve post vent valve connected with a pipeline behind the first steam valve, and a quick closing valve pre-vent valve connected with a pipeline in front of the quick closing valve.

[0008] Preferably, the oil system comprises a lubricating oil pump, a primary oil pressure control valve and a secondary oil pressure control valve, the inlet of the lubricating oil pump is connected with an upstream oil tank, the outlet is connected with the primary oil pressure control valve and the secondary oil pressure control valve in sequence, and the outlet of the secondary oil pressure control valve is connected with the oil inlets of the steam turbine unit, the compressor low-pressure cylinder and the compressor high-pressure cylinder respectively.

[0009] Preferably, the condensate system comprises a condensate pump, a condensate pump outlet valve and a condensate pump backflow valve, the inlet of the condensate pump is connected with the outlet of a condensate tank, and the outlet is connected with the condensate pump backflow valve and the condensate pump outlet valve respectively; the utility system comprises a low-pressure steam pipeline, a low-pressure nitrogen pipeline and a high-pressure nitrogen pipeline, the low-pressure steam pipeline is connected with a steam turbine, the low-pressure nitrogen pipeline and the high-pressure nitrogen pipeline are connected with a dry gas sealing system, and an air seal control valve is arranged on the low-pressure steam pipeline.

[0010] Preferably, the dry gas sealing system comprises a first sealing gas circuit, a second sealing gas circuit and a post isolation gas circuit connected with a first sealing cavity, a second sealing cavity and a post isolation sealing cavity of the compressor unit respectively, and each circuit is provided with a sealing gas control valve.

[0011] In addition, the application also discloses a starting control method of the compressor unit control system with the one-key start and stop function, which is applied to the compressor unit and comprises the following steps. S1, on-site preparation inspection: checking whether all conditions before one-key starting are met, ensuring that the circulating water of each water cooler, the desalted water supply is normal, the low-pressure and medium-pressure nitrogen supply is stable, the power steam supply is normal, the oil system test, the dry gas sealing system debugging are qualified, the instrument air source valve and the electric valve debugging are normal, the key tests of the system lubricating oil pump, the control oil, the quick closing valve, the overspeed and the interlock trip are qualified, and the disc car buckle is in a closed state; S2, the central control program system check: confirm the control system without device fault signal, no any alarm prompt, ensure that the starting preparation conditions before driving have been fully met; S3, one key start unit; S4, warm-up stage one: after the above conditions are met, automatically enter warm-up one; through opening the quick closing valve and adjusting the valve (adjusting the valve is fully open, and the quick closing valve controls the rotating speed), the unit vibration, displacement, bearing temperature, oil pressure, dry gas seal parameters are detected during the period, no alarm, then enter the next step, if there is an alarm, pause and return to the previous step; S5, warm-up stage two: after warm-up one is finished, enter warm-up two; fully open the quick closing valve, control the rotating speed through the adjusting valve, and synchronously detect the unit parameters, if there is an alarm, return to the previous step and pause, then manually handle and restore automatic control; S6, critical rotating speed stage: after warm-up two is finished, enter the critical rotating speed stage, set the target rotating speed and the rotating speed rate; automatically adjust the high and low pressure cylinder first stage sealing gas flow and lubricating oil temperature, and detect the unit parameters, if there is no alarm, then enter the next step, if there is an alarm, stop the rotating speed and return to the previous step; S7, gas connection stage: after the rotating speed reaches the target rotating speed, enter the gas connection stage; the logic control unit controls the first stage inlet valve and bypass valve, each stage anti-surge valve and adjusting valve according to the inlet pressure, each stage anti-surge control valve and the rotating speed of the unit; when the high pressure cylinder outlet pressure > 6.5Mpa, the first stage sealing gas of the dry gas seal of the high pressure cylinder is automatically switched, and when the low pressure cylinder outlet pressure > 6.5Mpa, the first stage sealing gas of the dry gas seal of the low pressure cylinder is automatically switched, and the flow and pressure difference are adjusted through the control valve when switching; after switching is completed, the medium pressure nitrogen control valve is gradually closed according to the pressure difference between the first stage sealing gas and the balance pipe; if the pressure difference is insufficient, pause; continuously detect the unit parameters during the rotating speed process, and if there is no alarm, the starting is completed.

[0012] Further, the S3 includes the following steps: S3-1, establish lubricating oil and control oil circulation: after the unit starting sequence control system is started, the rear isolation gas is first used, and after it is detected that the isolation gas pressure is qualified and the primary and secondary oil pressure valves are in the fully open state, the oil pump is started; taking the oil pressure as the control target, the lubricating oil and control oil pressure is adjusted to the qualified range (primary oil pressure 0.85-1.25Mpa, secondary oil pressure 0.25-0.3Mpa), and at the same time, it is confirmed that there is no vibration alarm for the running oil pump, and the lubricating oil system is established; S3-2, establish condensate circulation: after the lubricating oil system qualified signal is transmitted to the logic control unit, the condensate system hot well liquid level is taken as the control target to establish the liquid level, and after reaching the standard, the condensate pump is started; the condensate pump outlet valve and the backflow valve establish circulation through the cascade control program, and at the same time, it is confirmed that there is no vibration alarm for the running pump, and the condensate circulation is established; S3-3, put into use the disc wheel system: after the condensate circulation is established, the hot well liquid level is maintained for a period of time, the signal is transmitted to the logic control unit, the vacuum system related operation is started; first, 0.02Mpa is taken as the target to control the use of shaft seal steam, the pressure reaches the standard, the disc wheel control system is started, when the detection of the turbine disc wheel rotation speed reaches the set value, the disc wheel system is put into use; S3-4, establish the vacuum system: after the disc wheel system is put into use, the vacuum system is started; the auxiliary air ejector steam, the auxiliary air ejector air valve, the secondary air ejector steam and the secondary air ejector air valve are sequentially put into use, and the exhaust pressure reaches the final target, the vacuum system is established; S3-5, put into use the dry gas seal system: after the vacuum system is qualified, the first seal is established; the flow is taken as the target (75Nm³ / h for the low-pressure cylinder and 160Nm³ / h for the high-pressure cylinder), the flow control valve is adjusted, and it is ensured that the pressure difference between the first seal gas and the cylinder body balance pipe of the low-pressure cylinder is greater than 300kpa, and the pressure difference between the first seal gas and the cylinder body balance pipe of the high-pressure cylinder is greater than 500kpa; after meeting the requirements, the second seal is automatically put into use, and the following conditions need to be met simultaneously: the second seal gas flow of the low-pressure cylinder is greater than 10Nm³ / h, the first seal gas vent flow is 8-25Nm³ / h, and the vent pressure is less than 0.2Mpa; the second seal gas flow of the high-pressure cylinder is greater than 10Nm³ / h, the first seal gas vent flow is 8-32Nm³ / h, and the vent pressure is less than 0.2Mpa; after all conditions are met, the dry gas seal system is put into use; S3-6, steam pipe warming operation: after the dry gas seal system is qualified, the steam system is automatically put into use; first, the first and second steam valves are controlled to be fully opened, then the first steam valve is opened, the temperature is controlled at the rate of 30℃ / h and the pressure is controlled at the rate of 0.1Mpa / min, after the temperature behind the valve is greater than 360℃ and the pressure is greater than 3.8Mpa, the first valve is closed; then the second steam valve is opened, and the same rate is controlled, after the temperature behind the valve is greater than 360℃ and the pressure is greater than 3.8Mpa, the second valve is closed; finally, the first and second steam valves are opened, and the same rate is controlled, and the warming pipe is ended.

[0013] In addition, the application also discloses a stop control method of a compressor unit control system with one-key start and stop function, which is applied to the compressor unit and includes the following steps: Step 1, speed and pressure reduction control: when normally stopping, the one-key stop control unit is started, and the logic control unit controls the outlet vent valve of the unit to reduce the outlet pressure according to the anti-surge system operating point, and then gradually reduces the rotation speed of the unit according to the normal stopping speed parameter and by adjusting the air valve at the set speed reduction rate; Step 2, disc wheel system use: after detecting that the rotation speed of the unit is 0, the disc wheel is closed according to the sequence control, and the disc wheel motor is started; if the rotation speed of the unit reaches 5rpm, the disc wheel is normally put into use; if the rotation speed is still 0 after 1min, the disc wheel is failed to be put into use, and the program returns to restart the disc wheel control program; Step3, dry gas seal switching: when the unit outlet pressure drops to 5.0Mpa, the control unit controls the dry gas seal medium pressure nitrogen valve to be fully opened, and after detecting the full opening signal, the process gas dry gas seal control valve is gradually closed, and the pressure difference between the primary seal gas and the balance pipeline is maintained stable through the control valve during the period; Step4, vacuum system shutdown: after receiving the dry gas seal process gas control valve full closing signal, and the dry gas seal control parameter has no alarm, the logic control unit stops the vacuum system according to the sequence control program, and sequentially closes the primary air valve, the primary steam valve, the secondary air valve and the secondary steam valve of the air extractor; Step5, unit condensate discharge operation: when the turbine exhaust pressure is detected to be 0, the logic control unit controls the cylinder condensate valve of the turbine unit to be opened, and the valve opening degree is set to 10%, and the unit condensate discharge is performed.

[0014] The present application has the following advantages: 1. The control system of the present application includes three parts of preparation before one-key starting, one-key starting and one-key stopping, and realizes no on-site operation during the starting stage on the basis of equipment automation.

[0015] 2. The present application realizes one-key control of preparation and start-stop, realizes the safety of the on-site equipment of the device through the one-key start-stop control system of the unit, and avoids abnormal working conditions and sudden risks caused by unsafe human behaviors.

[0016] 3. The high intelligence of the one-key start-stop control system of the present application can greatly reduce the labor cost and realize the safe, economic and intelligent operation of the device.

[0017] 4. The present application reduces the personal injury, equipment damage and environmental hazards caused by occasional abnormalities during start-stop, realizes complete intelligentization of the unit control system, reduces labor cost, and improves the safety and economy of the device operation. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a compressor unit control system with one-key start-stop function.

[0019] Figure 2 It is a one-key start control program schematic diagram.

[0020] Figure 3 It is a condensate and vacuum system control program schematic diagram.

[0021] Figure 4 It is a dry gas seal and warm pipe control program schematic diagram.

[0022] Figure 5 It is a warm-up and spin control program schematic diagram.

[0023] Figure 6 This is a schematic diagram of the one-click stop control program.

[0024] Figure 7 This is a flowchart of the one-button start / stop control system for the compressor unit.

[0025] Figure 8 This is a DCS configuration diagram for a one-button start / stop control system. In the diagram: 1. Steam turbine unit; 2. Compressor low-pressure cylinder; 3. Compressor high-pressure cylinder; 4. Lubricating oil pump; 5. Condensate pump; 6. Primary steam valve; 7. Secondary steam valve; 8. Quick-closing valve; 9. Regulating valve; 10. Vent after primary steam valve; 11. Vent after secondary steam valve; 12. Condensate pump outlet valve; 13. Condensate pump return valve; 14. Shaft seal steam control valve; 15. Air seal control valve; 16. Post-isolation gas circuit; 17. Secondary sealing gas circuit; 18. Primary sealing gas circuit; 19. Primary oil pressure control valve; 20. Secondary oil pressure control valve; 21. Steam system; 22. Condensate system; 23. Utility system; 24. Dry gas seal system; 25. Oil system; 26. Intelligent control system; 27. DCS monitoring system; 28. Vacuum system; 29. ​​Steam valve assembly; 30. Vacuum valve assembly; 31. Standby steam valve assembly; 32. Standby vacuum valve assembly. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0027] Example 1: As Figure 1 As shown, a compressor unit control system with one-button start / stop function includes an intelligent control system 26, a steam system 21, an oil system 25, a condensate system 22, a dry gas sealing system 24, a vacuum system 28, and a utility system 23. The intelligent control system 26 integrates a DCS monitoring system 27. The steam system 21 includes a warm-up program and a gas seal steam activation program. The oil system 25 includes an oil circulation establishment program. The condensate system 22 includes a condensate circulation establishment program. The dry gas sealing system 24 includes a post-isolation gas seal activation program, a primary seal activation program, and a secondary seal activation program. The utility system 23 includes a circulating water activation program, a demineralized water activation program, a nitrogen activation program, a unit isolation air activation program, and PID control modules corresponding to the control valves of each system.

[0028] Preferably, the intelligent control system 26 includes an execution unit, a display unit, a logic control unit, and is divided into a one-key start main program control module and a one-key stop main program control module, which respectively call the required function modules in sequence according to the program; the function group control is divided according to the process flow, such as an oil system, a vacuum system, a utility system, a dry gas seal system, a condensate system, and an electrical system; each sub-function control sends instructions to each device control in the sub-function control after receiving the instruction from the upper level; the lower control level sends feedback signals to the upper control level to report the completion or timeout and fault status; the logic control unit includes a DCS processing unit, an input / output card, and a communication card, and the communication network of the DCS monitoring system 27 is divided into two layers, the upper layer is an upper computer operation network, mainly used to form the data exchange and communication structure between the operation layer and the server and the operator station, and all the configurations and information of the system are stored in the main server of the one-key start-stop system; the server can not only be connected to the operation network through Ethernet, but also be connected to the process data network through modules, and the lower layer is a process data network layer composed of multiple process controllers to realize decentralized control.

[0029] Preferably, the warm-up structure of the steam system 21 includes a warm pipe control structure, which includes a first steam valve 6, a second steam valve 7, a quick closing valve 8, and an adjusting air valve 9 connected in sequence, and further includes a first steam valve post vent valve 10 connected to the pipeline behind the first steam valve 6, and a quick closing valve pre-vent valve 11 connected to the pipeline in front of the quick closing valve 8.

[0030] Preferably, the oil system 25 includes a lubricating oil pump 4, a primary oil pressure control valve 19, and a secondary oil pressure control valve 20, the inlet of the lubricating oil pump 4 is connected to an upstream oil tank, and the outlet is connected to the primary oil pressure control valve 19 and the secondary oil pressure control valve 20 in sequence, and the outlet of the secondary oil pressure control valve 20 is connected to the inlet of the steam turbine unit 1, the compressor low-pressure cylinder 2, and the compressor high-pressure cylinder 3, respectively.

[0031] Preferably, the condensate system 22 includes a condensate pump 5, a condensate pump outlet valve 12, and a condensate pump return valve 13, the inlet of the condensate pump 5 is connected to the outlet of a condensate tank, and the outlet of the condensate pump 5 is connected to the condensate pump return valve 13 and the condensate pump outlet valve 12, respectively; the utility system 23 includes a low-pressure steam pipeline, a low-pressure nitrogen gas pipeline, and a high-pressure nitrogen gas pipeline, the low-pressure steam pipeline is connected to the steam turbine 1, the low-pressure nitrogen gas pipeline and the high-pressure nitrogen gas pipeline are connected to the dry gas seal system 24, and the low-pressure steam pipeline is provided with an air seal control valve 15.

[0032] Preferably, the dry gas seal system 24 includes a first-stage seal gas circuit 18, a second-stage seal gas circuit 17, and a rear isolation gas circuit 16 connected to the first-stage seal cavity, the second-stage seal cavity, and the rear isolation seal cavity of the compressor unit, respectively, and each circuit is provided with a seal gas control valve.

[0033] Embodiment 2: a start-up control method of a compressor unit control system with a one-key start-stop function, the specific steps are as follows: S1: check whether the on-site preparation work before one-key start-up has conditions, each water cooler circulating water is normally put into use, desalted water is normally put into use, low-pressure nitrogen and medium-pressure nitrogen supply is normal, power steam supply is normal, oil system test is normal, dry gas seal system debugging is normal, each instrument gas source valve and electric valve debugging is normal, system lubricating oil pump test, control oil test, quick closing valve tripping test, overspeed test, interlock trip test and other tests are qualified, and the disc car is in a closed state.

[0034] S2: check whether the central control program system before one-key start-up has conditions, confirm that the control system has no equipment fault signal, confirm that the system has no alarm signal, and confirm that the start-up preparation conditions before starting are completely met.

[0035] S3: one-key start-up of the unit.

[0036] S3-1: after one-key start-up of the unit, the unit start-up sequence control system, first establish the unit lubricating oil and control oil circulation, control the command to put into use the unit rear insulation gas, take the insulation gas pressure as the control target, the high and low pressure cylinder insulation gas control target is 0.25Mpa, when the system detects the insulation gas pressure qualified signal, in addition to meet the primary and secondary oil pressure valve position for full open state, after the conditions are met, start the oil pump. According to the oil pressure as the control target to adjust the lubricating oil and control oil pressure qualified, the primary oil pressure control target is 0.85-1.25Mpa, the secondary oil pressure control target is 0.25-0.3Mpa, when the system detects that the two oil pressure is qualified, at the same time, the background detects the running oil pump vibration situation without alarm, the lubricating oil system is established qualified.

[0037] S3-2: when the system detects that the lubricating oil system is established qualified signal, the signal is transmitted to the logic control unit, the condensate system establishment condition is confirmed, the condensate system hot well liquid level is taken as the control target, and the liquid level is established. When the logic control unit detects that the liquid level meets the conditions, the system starts the condensate pump, and the condensate pump outlet valve and the backflow valve establish the condensate circulation under the cascade control program, at the same time, the background running pump detects the vibration situation without alarm, and the condensate circulation is established.

[0038] S3-3: after the condensate circulation is established, the hot well liquid level is maintained at the set value for 5 minutes, the condensate system establishment completion signal is transmitted to the logic control unit, the logic control unit starts the vacuum system, first takes the shaft seal steam pressure (0.02Mpa) as the target value, controls the shaft seal steam valve to put into use the shaft seal steam, and when the pressure reaches the target value, the logic control unit starts the disc car control system, and the system automatically starts the disc car motor. When it is detected that the steam turbine disc car rotating speed is 5rpm, the disc car system is put into use.

[0039] S3-4: After the disc system is put into use, the signal is transmitted to the logic control unit, the logic control unit starts the vacuum system, first uses the auxiliary air extractor steam, sets the target value to 3.6Mpa, the use time is 1 minute, secondly uses the auxiliary air extractor air valve, the use time is set to 30 seconds, then uses the secondary air extractor steam, sets the target value to 3.6Mpa, the use time is 1 minute, finally uses the secondary air extractor air valve, the use time is set to 30 seconds, after use, the exhaust pressure is the final target set value, which is -88kpa, the logic control unit detects the signal, and the vacuum system is established.

[0040] S3-5: When it is detected that the vacuum system is established, the system establishes the dry gas seal system, first establishes the primary seal, takes the primary seal gas flow as the target set value, the low-pressure cylinder is 75Nm 3 / h, the high-pressure cylinder is 160Nm 3 / h, takes the primary seal gas flow control valve as the control object, and at the same time, the low-pressure cylinder primary seal gas and the cylinder body balance pipe pressure difference is greater than 300kpa, the high-pressure cylinder primary seal gas and the cylinder body balance pipe pressure difference is greater than 500kpa, after the above conditions are detected at the same time, the logic control unit automatically uses the secondary seal gas, takes the secondary seal gas flow as the set target, the low-pressure cylinder secondary seal gas flow is greater than 10Nm 3 / h, the low-pressure cylinder primary seal gas vent flow is greater than 8Nm 3 / h and less than 25Nm 3 / h, and at the same time, the low-pressure cylinder primary seal gas vent pressure is less than 0.2Mpa, the above three conditions are met at the same time, the high-pressure cylinder secondary seal gas flow is greater than 10Nm 3 / h, the high-pressure cylinder primary seal gas vent flow is greater than 8Nm 3 / h and less than 32Nm 3 / h, and at the same time, the high-pressure cylinder primary seal gas vent pressure is less than 0.2Mpa, the above three conditions are met at the same time, the logic control unit detects the above signal, and then the dry gas seal system is put into use.

[0041] S3-6: When the logic control unit detects the dry gas seal system commissioning completion signal, the system automatically commissions the steam system, first controls the program to control the first steam valve to open the back guide, the second steam valve to open the back guide, then controls to open the first steam valve, the target set value is the temperature rise rate and the pressure rise rate, the temperature rise rate is set to 30℃ / h, the pressure rise rate is 0.1 Mpa / min, when the logic control unit detects that the first valve back steam pipeline temperature is greater than 360℃, the pressure is greater than 3.8 Mpa, the system closes the first steam valve back guide, the system detects the closing signal, the logic control system opens the second steam valve, the target set value is the temperature rise rate and the pressure rise rate, the temperature rise rate is set to 30℃ / h, the pressure rise rate is 0.1 Mpa / min, the above two conditions are met at the same time, when the logic control unit detects that the second valve back steam pipeline temperature is greater than 360℃, the pressure is greater than 3.8 Mpa, the system closes the second steam valve back guide, the system detects the second steam valve back guide closing signal, the logic control system opens the quick closing valve before the vent valve, the target set value is the temperature rise rate and the pressure rise rate, the temperature rise rate is set to 30℃ / h, the pressure rise rate is 0.1 Mpa / min, the above two conditions are met at the same time, then the steam pipe warming is completed.

[0042] S4: When the logic control system detects that the above conditions are met at the same time, the system automatically enters the first warming stage, the target speed is 1100 rpm, the warming time is 30 min, the logic control system controls to open the quick closing valve and the regulating air valve, the regulating air valve is controlled to be fully open, the command quick closing valve controls the speed to ensure sufficient warming. The warming process control system detects whether there is an alarm signal of the unit vibration value, displacement value, bearing temperature, lubricating oil pressure, control oil pressure, dry gas seal, oil temperature, etc., detects the alarm signal, the program automatically stops and returns to the previous step, and the logic control system automatically enters the next control program without alarm signal.

[0043] S5: When the first warming stage lasts for 30 minutes, the control system enters the second warming stage, the target speed is 1800 rpm, the warming time is 40 min, the logic control system fully opens the quick closing valve, uses the regulating air valve to control the unit speed, and detects whether there is an alarm of the unit parameters, returns to the previous control command and pauses if an alarm occurs, the system manually intervenes, and continues to input the automatic control system after the alarm signal disappears.

[0044] S6: When the control system detects that the second warming stage runs for 40 minutes, the control system enters the critical speed stage, the target speed is 7882 rpm, the speed rise rate is 10 r / sec, the logic control system automatically adjusts the high and low pressure cylinder first stage sealing gas flow, lubricating oil temperature, and detects whether there is an alarm of the unit parameters, stops the speed rise and returns to the previous step if an alarm occurs, and the logic control system automatically enters the next control program without alarm signal.

[0045] S7: When the unit speed is increased to 7882 rpm, the unit enters the gas connection stage, and the logic control system controls the gas connection according to the inlet pressure, the first, second and third anti-surge control valves, and the unit speed logic control unit. The control objects are the first inlet large valve, the first inlet large valve bypass valve, the first, second and third anti-surge control valves, and the regulating gas valve. The control variable is the first inlet pressure 5.0 Mpa. When the high-pressure cylinder outlet pressure is greater than 6.5 Mpa, the high-pressure cylinder dry gas seal primary seal gas is automatically switched. During the switching process, the primary seal control valve controls the primary seal gas flow and the pressure difference between the primary seal gas and the balance pipe. When the low-pressure cylinder outlet pressure is greater than 6.5 Mpa, the low-pressure cylinder dry gas seal primary seal gas is automatically switched. During the switching process, the primary seal control valve controls the primary seal gas flow and the pressure difference between the primary seal gas and the balance pipe. When the dry gas seal switching is completed, the system gradually closes the medium-pressure nitrogen control valve according to the pressure difference between the primary seal gas and the balance pipe. If the pressure difference is lower than the set value, the medium-pressure nitrogen valve is stopped. When the pressure difference is higher than the set value, the logic control system continues to close the medium-pressure nitrogen valve. The logic control unit gradually increases the unit speed according to the system inlet pressure as the control variable. The first, second and third anti-surge valves are closed according to the best working anti-surge point. The unit speed is set to be less than 10900 rpm. During the process of increasing the speed from 7882 rpm to the target speed, the logic control system detects whether there are alarm signals such as unit vibration value, displacement value, bearing temperature, lubricating oil pressure, control oil pressure, dry gas seal, oil temperature, etc. If there are alarm signals, the system returns to the previous control instruction and pauses. The system is manually intervened. When the alarm signal disappears, the automatic control system is continued.

[0046] Example 3: A stop control method of a compressor unit control system with one-key start and stop function, the specific steps are as follows: S1: The one-key stop control unit of the unit is enabled when the unit is normally stopped. After the logic control unit detects the stop command, the control unit controls the unit outlet pressure, the first, second and third anti-surge valve positions, and the unit speed according to the position of the anti-surge system working point. The system first controls the unit outlet vent valve to reduce the unit outlet pressure. Then, the logic control system starts the regulating gas valve to gradually reduce the unit speed according to the stop speed rate. The stop speed rate is set according to the normal stop speed rate parameter of the unit.

[0047] S2: When the control system detects that the unit speed is 0, the disc is controlled according to the sequence control setting process. After closing, the disc is started. When the control system detects that the unit speed is 5 rpm, the disc is normally used. If the unit speed is 0 after the disc motor is used for 1 min, the disc is not used successfully. The program returns to the previous layer and restarts the disc control program.

[0048] S3: When the control system detects that the unit outlet pressure reaches 5.0Mpa, the control unit controls the dry gas seal medium pressure nitrogen valve to be fully opened, and after detecting the 100% full opening signal, the control program gradually closes the process gas dry gas seal control valve, and during the period, the pressure difference between the primary seal gas and the balance pipeline is controlled by the control valve.

[0049] S4: When the dry gas seal process gas control valve full closing signal is transmitted to the detection system, and there is no alarm in the dry gas seal control parameter, the system defaults that the dry gas seal switching is completed, the vacuum system is controlled to be disabled by the logic control unit according to the sequence control program, and the primary air extractor air valve and the primary air extractor steam valve, the secondary air extractor air valve and the secondary air extractor steam valve are sequentially closed according to the set disabling program.

[0050] S5: When the control system detects that the turbine exhaust pressure is 0 (G), the logic control unit controls the turbine unit exhaust valve to be opened, the control object is the turbine unit cylinder exhaust valve, and the control variable is the valve opening degree 10%, and the unit performs condensate discharge.

[0051] The above embodiments are only preferred technical solutions of the present application, and should not be regarded as a limitation of the present application, and the protection scope of the present application should be based on the technical solutions recited in the claims, including the equivalent replacement solutions of the technical features recited in the claims. That is, within this range, equivalent replacement improvements are also within the protection scope of the present application.

Claims

1. A compressor unit control system with one-button start / stop function, characterized in that: It includes an intelligent control system (26), a steam system (21), an oil system (25), a condensate system (22), a dry gas sealing system (24), a vacuum system (28), and a utility system (23). The intelligent control system (26) integrates a DCS monitoring system (27). The steam system (21) includes a warm-up program and a gas-sealing steam activation program. The oil system (25) includes an oil circulation establishment program. The condensate system (22) includes a condensate circulation establishment program. The dry gas sealing system (24) includes a post-isolation gas seal activation program, a primary seal activation program, and a secondary seal activation program. The utility system (23) includes a circulating water activation program, a demineralized water activation program, a nitrogen activation program, a unit isolation air activation program, and PID control modules corresponding to the control valves of each system.

2. The compressor unit control system with one-button start / stop function according to claim 1, characterized in that: The intelligent control system (26) includes an execution unit, a display unit, and a logic control unit, and is divided into a one-key start main program control module and a one-key stop main program control module; the logic control unit includes a DCS processing unit, input / output cards, and communication cards; the communication network of the DCS monitoring system (27) is divided into upper and lower layers. The upper layer is the host computer operation network, which is used for data exchange and communication between the operation layer, the server, and the operator station. The system configuration and information are stored in the main server. The lower layer is the process data network layer, which is composed of multiple process controllers to realize distributed control.

3. The compressor unit control system with one-button start / stop function according to claim 1, characterized in that: The warm-up structure of the steam system (21) includes a warm-up pipe control structure, which includes a first steam valve (6), a second steam valve (7), a quick-closing valve (8), and a regulating valve (9) connected in sequence. It also includes a vent valve (10) connected to the pipe after the first steam valve (6) and a vent valve (11) connected to the pipe before the quick-closing valve (8).

4. The compressor unit control system with one-button start / stop function according to claim 1, characterized in that: The oil system (25) includes a lubricating oil pump (4), a primary oil pressure control valve (19), and a secondary oil pressure control valve (20). The inlet of the lubricating oil pump (4) is connected to the upstream oil tank, and the outlet is connected to the primary oil pressure control valve (19) and the secondary oil pressure control valve (20) in sequence. The outlet of the secondary oil pressure control valve (20) is connected to the oil inlet of the turbine unit (1), the low-pressure cylinder (2) of the compressor, and the high-pressure cylinder (3) of the compressor, respectively.

5. The compressor unit control system with one-button start / stop function according to claim 1, characterized in that: The condensate system (22) includes a condensate pump (5), a condensate pump outlet valve (12), and a condensate pump return valve (13). The inlet of the condensate pump (5) is connected to the outlet of the condensate tank, and the outlet of the condensate pump (5) is connected to the condensate pump return valve (13) and the condensate pump outlet valve (12), respectively. The utility system (23) includes a low-pressure steam pipeline, a low-pressure nitrogen pipeline, and a high-pressure nitrogen pipeline. The low-pressure steam pipeline is connected to the steam turbine (1), and the low-pressure nitrogen pipeline and the high-pressure nitrogen pipeline are connected to the dry gas sealing system (24). An air seal control valve (15) is provided on the low-pressure steam pipeline.

6. The compressor unit control system with one-button start / stop function according to claim 1, characterized in that: The dry gas sealing system (24) includes a primary sealing gas circuit (18), a secondary sealing gas circuit (17), and a rear isolation gas circuit (16) that are respectively connected to the primary sealing chamber, the secondary sealing chamber, and the rear isolation sealing chamber of the compressor unit. Each circuit is equipped with a sealing gas control valve.

7. A start-up control method for a compressor unit control system with one-button start / stop function, applied to the compressor unit according to any one of claims 1-6, characterized in that: Includes the following steps: S1. On-site preparation inspection: Check whether all on-site conditions are met before one-button start-up, and ensure that the circulating water and demineralized water supply of each water cooler is normal, the low-pressure and medium-pressure nitrogen supply is stable, and the power steam supply is normal. The oil circuit system test and dry gas sealing system commissioning were qualified, and the air source valves and electric valves of each instrument were normal. The key tests of the system lubricating oil pump, control oil, quick-closing valve tripping, overspeed, and interlock tripping were all qualified, and the turning gear was in the closed state. S2. Central control system check: Confirm that the control system has no equipment fault signals and no alarm prompts, and ensure that the start-up preparation conditions before starting are fully met; S3, One-button start unit; S4. Warm-up Stage 1: After all the above conditions are met, the machine will automatically enter Warm-up Stage 1. It is controlled by opening the quick-closing valve and the regulating air valve (the regulating air valve is fully open and the quick-closing valve controls the speed). During this period, the machine vibration, displacement, bearing temperature, low oil pressure, and dry air seal parameters are detected. If there is no alarm, the machine will proceed to the next step. If there is an alarm, the machine will pause and return to the previous step. S5, Warm-up Stage Two: After Warm-up One is completed, Warm-up Two begins; Fully open the fast-closing valve, control the speed by adjusting the air valve, and synchronously detect the unit parameters. If an alarm is detected, return to the previous level command to pause. After manual handling, automatic control is restored. S6. Critical Speed ​​Stage: After the second warm-up is completed, the critical speed stage is entered. The target speed and acceleration rate are set. The flow rate of the first-stage sealing gas of the high and low pressure cylinders and the temperature of the lubricating oil are automatically adjusted. The unit parameters are detected. If there is no alarm, the next step is entered. If there is an alarm, the acceleration is stopped and the previous step is returned. S7. Gas Connection Stage: After accelerating to the target speed, the gas connection stage begins. The logic control unit controls the first-stage inlet valve and bypass valve, the anti-surge valves of each stage, and the regulating gas valve based on the inlet pressure, the anti-surge control valves of each stage, and the unit speed. When the outlet pressure of the high-pressure cylinder is >6.5 MPa, its dry gas seal first-stage sealing gas automatically switches. When the outlet pressure of the low-pressure cylinder is >6.5 MPa, its low-pressure cylinder dry gas seal first-stage sealing gas automatically switches. During switching, the flow rate and pressure difference are adjusted through the control valve. After switching, the medium-pressure nitrogen control valve is gradually closed based on the pressure difference between the first-stage sealing gas and the balance pipe. If the pressure difference is insufficient, the process is paused. During the acceleration process, the unit parameters are continuously monitored. If there is no alarm, the startup is completed.

8. The start-up control method for a compressor unit control system with one-button start / stop function according to claim 7, characterized in that: S3 includes the following steps: S3-1. Establishing Lubricating Oil and Control Oil Circulation: After the unit starts the sequential control system, first activate the post-isolation gas. Once the isolation gas pressure is found to be qualified and the primary and secondary oil pressure valves are fully open, start the oil pump. Using oil pressure as the control target, adjust the lubricating oil and control oil pressure to the qualified range (primary oil pressure 0.85-1.25 MPa, secondary oil pressure 0.25-0.3 MPa). At the same time, confirm that there is no vibration alarm from the running oil pump to complete the establishment of the lubricating oil system. S3-2. Establishing condensate circulation: After the qualified signal of the lubricating oil system is transmitted to the logic control unit, the liquid level is established with the hot well liquid level of the condensate system as the control target. After the target is reached, the condensate pump is started. The condensate pump outlet valve and return valve establish circulation through the cascade control program. At the same time, it is confirmed that there is no vibration alarm of the running pump. The condensate circulation is established. S3-3. Commissioning of the turning gear system: After the condensate circulation is established, the hot well liquid level is maintained at the set value for a period of time. The signal is transmitted to the logic control unit to start the relevant operations of the vacuum system. First, the shaft seal steam is controlled to be commissioned with a target pressure of 0.02 MPa. After the pressure reaches the target, the turning gear control system is started. When the turbine turning gear speed is detected to have reached the set value, the commissioning of the turning gear system is completed. S3-4. Establishing a vacuum system: After the turning gear system is put into operation, start the vacuum system; sequentially activate the auxiliary ejector steam, auxiliary ejector air valve, secondary ejector steam, and secondary ejector air valve. Once the exhaust pressure reaches the final target, the vacuum system is established. S3-5. Activation of the Dry Gas Sealing System: After the vacuum system is qualified, first establish the primary seal. Using the flow rate as the target (75 Nm³ / h for the low-pressure cylinder and 160 Nm³ / h for the high-pressure cylinder), adjust the flow rate through the flow control valve, ensuring that the pressure difference between the primary sealing gas and the cylinder balance pipe in the low-pressure cylinder is >300 kPa, and the pressure difference in the high-pressure cylinder is >500 kPa. Once these conditions are met, the secondary seal will be automatically activated, requiring the following simultaneous conditions: secondary sealing gas flow rate in the low-pressure cylinder >10 Nm³ / h, primary sealing gas vent flow rate 8-25 Nm³ / h, and vent pressure <0.2 MPa; secondary sealing gas flow rate in the high-pressure cylinder >10 Nm³ / h, primary sealing gas vent flow rate 8-32 Nm³ / h, and vent pressure <0.2 MPa. Once all conditions are met, the dry gas sealing system is successfully activated. S3-6 Steam Warming Operation: After the dry gas sealing system is qualified, the steam system is automatically put into operation; first, control the first and second steam valves to fully open the drain, then open the first steam valve and control it at a rate of 30℃ / h for temperature increase and 0.1Mpa / min for pressure increase. When the temperature after the valve is >360℃ and the pressure is >3.8Mpa, close the drain after the first valve; then open the second steam valve and control it at the same rate. After the standard is reached, close the drain after the second valve; finally, open the vent valve before the quick-closing valve and control it at the same rate as above. The warming is then complete.

9. A stop control method for a compressor unit control system with one-button start / stop function, applied to the compressor unit according to any one of claims 1-6, characterized in that: Includes the following steps: Step 1, Speed ​​and Pressure Reduction Control: When stopping normally, the one-button stop control unit is activated. The logic control unit first controls the unit outlet vent valve to reduce the outlet pressure based on the anti-surge system operating point, and then gradually reduces the unit speed according to the normal stop rate parameters by adjusting the air valve at the set speed reduction rate. Step 2, Turning gear system commissioning: After detecting that the unit speed is 0, press the sequential control to close the turning gear and start the turning gear motor; if the unit speed is detected to reach 5 rpm, the turning gear commissioning is normal; if the speed is still 0 after 1 minute of commissioning, the commissioning has failed, and the program will return to restart the turning gear control program. Step 3, Dry Gas Seal Switching: When the unit outlet pressure drops to 5.0 MPa, the control unit controls the medium-pressure nitrogen valve of the dry gas seal to be fully opened. After detecting the fully open signal, the process gas dry gas seal control valve is gradually closed. During this period, the pressure difference between the primary sealing gas and the balance pipeline is maintained stable through the control valve. Step 4: Vacuum system shutdown: Upon receiving the signal that the dry gas sealing process gas control valve is fully closed and there is no alarm in the dry gas sealing control parameters, the logic control unit shuts down the vacuum system according to the sequential control procedure, closing the first-stage ejector air valve, the first-stage ejector steam valve, the second-stage ejector air valve, and the second-stage ejector steam valve in sequence. Step 5, Unit condensate purging operation: When the turbine exhaust pressure is detected to be 0, the logic control unit controls the turbine cylinder condensate purging valve to open, and the valve opening is set to 10% to perform unit condensate purging.

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