One-key hot standby control method and device for a natural gas long-distance pipeline compressor

Abstract

The present invention relates to a one-key hot standby control method and device for a compressor in a long-distance natural gas pipeline. The method includes a step of establishing a hot standby mode; the hot standby mode includes a pressure relief hot standby mode and a pressure maintenance hot standby mode; the step of establishing the pressure relief hot standby mode includes successively starting an instrument air system commissioning mode, a lubricating oil pump pre-test mode, a smoke exhaust fan commissioning mode, a lubricating oil tank heater commissioning mode, a lubricating oil pump test mode, a lubricating oil pump commissioning mode, and a high-level oil tank commissioning mode. The pressure maintenance hot standby mode adds a dry gas seal system commissioning mode, a compressor pipeline purging mode, and a compressor pipeline pressure equalization mode on the basis of the pressure relief hot standby mode. The present invention can achieve one-key hot standby of the compressor, without manual operation, realize one-key full-automatic startup of the compressor, shorten the hot standby time and startup duration, realize real-time hot standby and rapid startup of the compressor in the gas compression station, realize one-key full-automatic commissioning of the gas compression station, and lay a foundation for the construction of an unattended station yard.

Description

Technical Field

[0001] The present invention relates to the technical field of hot standby of compressors for long-distance natural gas pipelines, and particularly relates to a one-key hot standby control method and device for compressors of long-distance natural gas pipelines. Background Art

[0002] At present, the hot standby of compressors for long-distance natural gas pipelines mainly automatically tests and starts each auxiliary system of the compressor to meet the hot standby conditions, and then enters the starting sequence to start the compressor unit. The auxiliary systems of the compressor mainly include the instrument air system, the dry gas seal system, and the lubricating oil system. Among them, the lubricating oil system is mainly divided into two categories. One is to set main and standby lubricating oil pumps and emergency oil pumps. The emergency oil pump usually uses UPS power supply. Once a sudden power outage occurs or the main and standby oil pumps fail to supply oil, the emergency oil pump starts for emergency use. The other is to set main and standby lubricating oil pumps and a high-level oil tank. When the lubricating oil system fails, the high-level oil tank supplies lubricating oil to the unit by relying on the gravitational potential energy of the height difference to prevent bearing wear and shaft bush burnout. In terms of reliability, the high-level oil tank that does not require external force drive is more reliable than the emergency oil pump.

[0003] For the configuration of the high-level oil tank in the lubricating oil system, in the current compressor hot standby mode, it is necessary to manually operate the stop valve to fill the high-level oil tank, which takes about 30 minutes, and it is easy to cause improper operation of the stop valve, resulting in a decrease in the pressure of the lubricating oil main pipe during the oil filling process and interlocking to start the standby lubricating oil pump, affecting the operation of the lubricating oil system. If you want to achieve full automatic hot standby without human intervention, you can only fill the high-level oil tank through an orifice plate. It takes about 5 or 6 hours for the liquid level of the high-level oil tank to meet the starting conditions, which is too time-consuming and seriously affects the dispatching operation of the compressor.

[0004] At present, the hot standby control of the compressor unit only involves the operation of the compressor auxiliary system and is not combined with the process flow state. During the starting process, the pipeline purging of the compressor takes about 20 minutes, the pipeline pressure equalization takes about 55 minutes, and the compressor is started after the operation process of the compressor is conducted. The starting process takes too long to meet the requirements of real-time hot standby and rapid start of the compressor, restricting the realization of the one-key start-stop station function and the construction of unattended stations.

[0005] In summary, for the compressor unit of long-distance natural gas pipelines with a high-level oil tank configured in the auxiliary system, how to achieve the one-key hot standby mode without human intervention and optimize the shortest time for meeting the hot standby conditions is an urgent problem to be solved at present. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a one-key hot standby control method and device for compressors in long-distance natural gas pipelines, to solve the problem that there is no mature control for the full-automatic hot standby of compressor units in long-distance natural gas pipelines with a high-position oil tank configured for the auxiliary system in the prior art, to solve the problem that the start-up process of the hot standby compressor unit in the long-distance natural gas pipeline in the prior art takes too long and cannot meet the scheduling operation requirements, and to realize the real-time full-automatic hot standby and rapid start of the compressors in the gas compression station, so as to assist the construction of one-key start-stop stations and unmanned station yards in the gas compression station.

[0007] The technical solution of the present invention to solve the above technical problems is as follows: A one-key hot standby control method for compressors in long-distance natural gas pipelines, which is used to automatically test and start the auxiliary system of the compressors in long-distance natural gas pipelines; wherein, the auxiliary system includes an instrument air system, a dry gas seal system, and a lubricating oil system configured with a high-position oil tank;

[0008] The one-key hot standby control method for compressors in long-distance natural gas pipelines includes a hot standby mode establishment step; wherein, the hot standby mode is any one of a pressure relief hot standby mode and a pressure maintenance hot standby mode; when the pressure relief hot standby preset conditions are met, the pressure relief hot standby mode establishment step is executed; the specific steps of the pressure relief hot standby mode establishment step are as follows:

[0009] S1, Start the instrument air system commissioning mode to activate the instrument air system commissioning mode; when the instrument air system commissioning mode is activated, open the dry gas seal panel instrument air inlet electric valve in the instrument air system to allow the instrument air in the compressor isolation gas pipeline of the instrument air system to enter, so that the compressor isolation gas pressure reaches the preset value of the normal start-up pressure; at the same time, open the motor purge pipeline instrument air inlet electric valve in the instrument air system to allow the instrument air in the motor purge pipeline of the instrument air system to enter, so that the motor positive pressure ventilation enters the purge mode; and open the dry gas seal booster skid inlet electric valve to allow the pipeline of the dry gas seal booster skid to intake air; when the dry gas seal panel instrument air inlet electric valve feedback is fully open, the motor purge pipeline instrument air inlet electric valve status feedback is fully open, the dry gas seal booster skid inlet electric valve feedback is fully open, and the dry gas seal booster skid pipeline pressure and the compressor isolation gas pressure reach the preset value of the normal start-up pressure, start the lubricating oil pump pre-test mode after a preset time delay;

[0010] S2, When the lubricating oil pump pre-test mode is activated, stop the main lubricating oil pump and the standby lubricating oil pump in the lubricating oil system; when the lubricating oil pump pre-test mode is activated, the main lubricating oil pump status feedback stops and the standby lubricating oil pump status feedback stops, start the smoke exhaust fan commissioning mode after a preset time delay;

[0011] S3, When the smoke exhaust fan commissioning mode is activated, start the lubricating oil tank smoke exhaust fan in the lubricating oil system; when the smoke exhaust fan commissioning mode is activated and the lubricating oil tank smoke exhaust fan status feedback is running, start the lubricating oil tank heater commissioning mode after a preset time delay;

[0012] S4. When the lubricating oil tank heater operation mode is activated, start the lubricating oil tank heater in the lubricating oil system; when the lubricating oil tank heater operation mode is activated, the status feedback of the lubricating oil tank heater is running, and the lubricating oil tank temperature is higher than the preset value of the low oil tank temperature alarm, delay the preset time to start the lubricating oil pump test mode;

[0013] S5. When the lubricating oil pump test mode is activated, and the conditions for allowing the start of the lubricating oil pump are met, the compressor is not running, and the compressor has not entered the starting process, start the lubricating oil test pump in the lubricating oil system; when the lubricating oil pump test mode is activated, the status feedback of the lubricating oil test pump is running, and the lubricating oil header pressure reaches the preset value of the normal starting header pressure and lasts for the preset time, then delay the preset time to start the lubricating oil pump operation mode;

[0014] S6. When the lubricating oil pump operation mode is activated, stop the lubricating oil test pump; when the lubricating oil pump operation mode is activated and the status feedback of the lubricating oil test pump is stopped, start the lubricating oil running pump in the lubricating oil system; when the lubricating oil pump operation mode is activated, the status feedback of the lubricating oil test pump is stopped, the status feedback of the lubricating oil running pump is running, and the lubricating oil header pressure reaches the preset value of the normal starting header pressure and lasts for the preset time, then delay the preset time to start the overhead tank operation mode;

[0015] S7. When the overhead tank operation mode is activated, put the overhead tank into use.

[0016] On the basis of the above technical solutions, the present invention can also be improved as follows.

[0017] Further, when the preset conditions for pressure-maintaining hot standby are met, execute the steps for establishing the pressure-maintaining hot standby mode; the steps for establishing the pressure-maintaining hot standby mode include the above S1 to S7, and after S7, delay the preset time to start the dry gas seal system operation mode;

[0018] S8. When the dry gas seal system operation mode is activated, open the pneumatic valve at the dry gas seal inlet; when the dry gas seal system operation mode is activated, the pneumatic valve at the dry gas seal inlet feedbacks fully open, the flow rate of the primary seal gas at the drive end is higher than the low alarm preset value, and the flow rate of the primary seal gas at the non-drive end is higher than the low alarm preset value, delay the preset time to start the compressor pipeline purging mode;

[0019] S9. When the compressor pipeline purging mode is activated, open the vent valve and the inlet loading valve; when the compressor pipeline purging mode is activated, the vent valve feedbacks fully open, and the inlet loading valve feedbacks fully open, delay the preset time to start the compressor pipeline pressure equalizing mode;

[0020] S10. When the compressor pipeline pressure equalizing mode is activated, close the compressor vent valve.

[0021] Among them, when the pressure relief hot standby mode is put into use, if the preset conditions for pressure maintenance hot standby are met, the pressure relief hot standby mode is switched to the pressure maintenance hot standby mode by setting a manual switching function. The switching process is to add the S8 to the S10 on the basis of the establishment of the pressure relief hot standby mode.

[0022] Further, the preset conditions for the pressure relief hot standby are specifically as follows: the dry gas seal disk instrument air inlet electric valve, the motor purge pipeline instrument air inlet electric valve, and the dry gas seal booster skid inlet electric valve in the instrument air system are in the remote control state, without fault alarm status, and without timeout alarm status; at the same time, the lubricating oil tank exhaust fan, the lubricating oil tank heater, the main lubricating oil pump, and the standby lubricating oil pump in the lubricating oil system are in the remote control state and without fault alarm status;

[0023] The preset conditions for the pressure maintenance hot standby are specifically as follows: the dry gas seal disk instrument air inlet electric valve, the motor purge pipeline instrument air inlet electric valve, the dry gas seal booster skid inlet electric valve, the compressor inlet loading valve, and the compressor vent valve are in the remote control state, without fault alarm status, and without timeout alarm status; at the same time, the lubricating oil tank exhaust fan, the lubricating oil tank heater, the main lubricating oil pump, and the standby lubricating oil pump are in the remote control state and without fault alarm status.

[0024] Further, the lubricating oil test pump is selected from the main lubricating oil pump and the standby lubricating oil pump of the lubricating oil system. The process of selecting the lubricating oil test pump is manual selection or automatic selection; the method of automatically selecting the lubricating oil test pump is to select according to the cumulative operation duration or / and the cumulative number of faults.

[0025] Further, in the S7, before putting the elevated oil tank into use, the following steps are also included: increasing the orifice plate of the elevated oil tank.

[0026] Further, in the S7, before putting the elevated oil tank into use, the following steps are also included: replacing the globe valve of the elevated oil tank with an electric or pneumatic control valve, and putting the elevated oil tank into use based on PID control of the control valve.

[0027] Further, in the S7, before putting the elevated oil tank into use, the following steps are also included: replacing the globe valve of the elevated oil tank with an electric or pneumatic control valve, and putting the elevated oil tank into use based on split-range control of the control valve.

[0028] Further, during the establishment of the pressure relief hot standby mode, the one-key hot standby control method for the natural gas long-distance pipeline compressor also includes the steps of monitoring the process of the pressure relief hot standby mode. The specific steps of monitoring the process of the pressure relief hot standby mode are as follows:

[0029] S100, monitoring the operation mode of the instrument air system;

[0030] S200, monitoring the pre-test mode of the lubricating oil pump;

[0031] S300, Monitoring of the operation mode of the smoke exhaust fan;

[0032] S400, Monitoring of the operation mode of the lubricating oil tank heater;

[0033] S500, Monitoring of the test mode of the lubricating oil pump;

[0034] S600, Monitoring of the operation mode of the lubricating oil pump;

[0035] S700, Monitoring of the operation mode of the elevated oil tank;

[0036] S800, Monitoring of the pressure relief hot standby mode;

[0037] Furthermore, during the establishment of the pressure-maintaining hot standby mode, the one-key hot standby control method for the natural gas long-distance pipeline compressor further includes a pressure-maintaining hot standby mode process monitoring step, which includes the steps from S100 to S700. After S700, it further includes,

[0038] S900, Monitoring of the operation mode of the dry gas seal system;

[0039] S1000, Monitoring of the compressor pipeline purging mode;

[0040] S1100, Monitoring of the compressor pipeline pressure equalization mode;

[0041] S1200, Monitoring of the pressure-maintaining hot standby mode.

[0042] Based on the above one-key hot standby control method for the natural gas long-distance pipeline compressor, the present invention further provides a one-key hot standby control device for the natural gas long-distance pipeline compressor.

[0043] A one-key hot standby control device for the natural gas long-distance pipeline compressor includes a memory and a processor. A computer program is stored in the memory, and when the computer program is executed by the processor, the one-key hot standby control method for the natural gas long-distance pipeline compressor as described above is implemented.

[0044] The beneficial effects of the present invention are as follows: In a one-key hot standby control method and system for a natural gas long-distance pipeline compressor according to the present invention, the instrument air system startup mode, the lubricating oil pump pre-test mode, the smoke exhaust fan startup mode, the lubricating oil tank heater startup mode, the lubricating oil pump test mode, the lubricating oil pump startup mode, and the elevated oil tank startup mode are sequentially started to achieve one-key hot standby of the compressor without manual operation, realizing one-key fully automatic startup of the compressor. At the same time, to shorten the hot standby time, the present application runs the positive pressure ventilation purge of the motor and other equipment of the auxiliary system in multiple threads, saving the startup time for the motor positive pressure ventilation to enter the leakage compensation mode, shortening the hot standby time, realizing real-time hot standby of the compressor in the gas compression station, and realizing one-key fully automatic startup of the gas compression station, laying a foundation for the construction of an unmanned station yard. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a flowchart of the steps for establishing the pressure relief hot standby mode in a one-key hot standby control method for a natural gas long-distance pipeline compressor according to the present invention;

[0046] Figure 2 It is a flowchart of the steps for monitoring the process of the pressure relief hot standby mode in a one-key hot standby control method for a natural gas long-distance pipeline compressor according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0047] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0048] A one-key hot standby control method for a natural gas long-distance pipeline compressor is used to automatically test and start the auxiliary system of the natural gas long-distance pipeline compressor. Among them, the auxiliary system includes an instrument air system, a dry gas seal system, and a lubricating oil system configured with an elevated oil tank.

[0049] The one-key hot standby control method for the natural gas long-distance pipeline compressor includes steps for establishing a hot standby mode, steps for putting the hot standby mode into use, steps for monitoring the process of the hot standby mode, and steps for resetting the hot standby mode.

[0050] The following is a specific description of each step.

[0051] I. Steps for establishing the hot standby mode:

[0052] Among them, to meet the requirements of flexible scheduling and rapid load increase and decrease of the compressor unit in the long-distance natural gas pipeline, two one-key hot standby modes of pressure relief hot standby and pressure maintenance hot standby are set. For pressure relief hot standby, each auxiliary system operates normally, and the pipelines inside the compressor system are in a pressure relief state. Pipeline purging and equalizing can be carried out at any time. After the compressor operation process is conducted, the compressor is started. It is applicable to compressor stations with low requirements for the startup time or no emergency startup tasks. For pressure maintenance hot standby, each auxiliary system operates normally, and the pipelines inside the compressor system are in a pressure maintenance state. The compressor can be started at any time and quickly. It is applicable to compressor stations with emergency startup tasks.

[0053] Before performing the steps for establishing the pressure relief hot standby mode, it is necessary to meet the preset conditions for pressure relief hot standby: the dry gas seal panel instrument air inlet electric valve, motor purge pipeline instrument air inlet electric valve, and dry gas seal booster skid inlet electric valve in the instrument air system are in the remote control state, without fault alarms and timeout alarms; at the same time, the lubricating oil tank exhaust fan, lubricating oil tank heater, main lubricating oil pump, and standby lubricating oil pump in the lubricating oil system are in the remote control state and without fault alarms. The preset conditions for pressure relief hot standby are met.

[0054] As Figure 1 shown, the steps for establishing the pressure relief hot standby mode are specifically as follows:

[0055] S1, Instrument air system operation mode: When the preset conditions for hot standby are met and the pressure relief hot standby mode is not completed, the hot standby mode command of the station control system or the compressor control system is issued, triggering the instrument air system operation mode by pulse and making a reset setting for the hot standby mode. Start the instrument air system operation mode to activate the instrument air system operation mode; after the instrument air system operation mode is activated, open the dry gas seal panel instrument air inlet electric valve in the instrument air system to allow the instrument air in the compressor isolation gas pipeline to enter, so that the compressor isolation gas pressure reaches the preset value of the normal startup pressure (can be set); at the same time, open the motor purge pipeline instrument air inlet electric valve in the instrument air system to allow the instrument air in the motor purge pipeline to enter, so that the motor positive pressure ventilation enters the purge mode; and open the dry gas seal booster skid inlet electric valve to allow the pipeline of the dry gas seal booster skid to intake air; when the feedback of the dry gas seal panel instrument air inlet electric valve is fully open, the status feedback of the motor purge pipeline instrument air inlet electric valve is fully open, the feedback of the dry gas seal booster skid inlet electric valve is fully open, and the pressure of the dry gas seal booster skid pipeline and the compressor isolation gas pressure reach the preset value of the normal startup pressure, start the lubricating oil pump pre-test mode after a preset time delay (can be set, such as 10 seconds) and make a reset setting for the pressure relief hot standby mode.

[0056] S2. After the lubricating oil pump pre-test mode is activated, stop the main lubricating oil pump and the standby lubricating oil pump in the lubricating oil system; when the lubricating oil pump pre-test mode is activated, the main lubricating oil pump status feedback stops, and the standby lubricating oil pump status feedback stops, delay for a preset time (settable, e.g., 10 seconds) to start the smoke exhaust fan operation mode and reset the pressure relief hot standby mode.

[0057] S3. After the smoke exhaust fan operation mode is activated, start the smoke exhaust fan of the lubricating oil tank in the lubricating oil system; when the smoke exhaust fan operation mode is activated and the smoke exhaust fan of the lubricating oil tank status feedback is running, delay for a preset time (settable, e.g., 10 seconds) to start the lubricating oil tank heater operation mode and reset the pressure relief hot standby mode.

[0058] S4. After the lubricating oil tank heater operation mode is activated, start the lubricating oil tank heater in the lubricating oil system; when the lubricating oil tank heater operation mode is activated, the lubricating oil tank heater status feedback is running, and the lubricating oil tank temperature is higher than the preset value of the low oil tank temperature alarm (settable), delay for a preset time (settable, e.g., 10 seconds) to start the lubricating oil pump test mode and reset the pressure relief hot standby mode.

[0059] S5. After the lubricating oil pump test mode is activated, and when the conditions for allowing the start of the lubricating oil pump are met, the compressor is not running, and the compressor is not in the starting process, start the lubricating oil test pump in the lubricating oil system; when the lubricating oil pump test mode is activated, the lubricating oil test pump status feedback is running, and the lubricating oil main pipe pressure reaches the preset value of the normal starting main pipe pressure (settable) and lasts for a preset time (settable, e.g., 60 seconds), then delay for a preset time (settable, e.g., 10 seconds) to start the lubricating oil pump operation mode and reset the pressure relief hot standby mode;

[0060] The lubricating oil test pump is selected from the main lubricating oil pump and the standby lubricating oil pump of the lubricating oil system. The process of selecting the lubricating oil test pump is manual selection or automatic selection; there are three methods for automatically selecting the lubricating oil test pump, and the selection basis is the cumulative operation duration or / and the cumulative number of failures;

[0061] The first selection method: When selecting the lubricating oil test pump according to the cumulative operation duration, the lubricating oil pump with a longer cumulative operation duration is used as the lubricating oil test pump; for example: when the cumulative operation duration of the main lubricating oil pump is longer than that of the standby lubricating oil pump, the main lubricating oil pump is used as the lubricating oil test pump; when the cumulative operation duration of the standby lubricating oil pump is longer than that of the main lubricating oil pump, the standby lubricating oil pump is used as the lubricating oil test pump.

[0062] The second selection method: When selecting the lubricating oil test pump based on the cumulative number of failures, the lubricating oil pump with a larger cumulative number of failures is used as the lubricating oil test pump; for example: when the cumulative number of failures of the main lubricating oil pump is more than that of the standby lubricating oil pump, the main lubricating oil pump is used as the lubricating oil test pump; when the cumulative number of failures of the standby lubricating oil pump is more than that of the main lubricating oil pump, the standby lubricating oil pump is used as the lubricating oil test pump.

[0063] The third selection method: When selecting the lubricating oil test pump based on the cumulative operating duration and the cumulative number of failures, if the cumulative number of failures of the main lubricating oil pump and the cumulative number of failures of the standby lubricating oil pump are both less than or equal to the preset number of failures (which can be set), the lubricating oil pump with a longer cumulative operating duration is used as the lubricating oil test pump; if the cumulative number of failures of the main lubricating oil pump or / and the cumulative number of failures of the standby lubricating oil pump is more than the preset number of failures, the lubricating oil pump with a larger cumulative number of failures is used as the lubricating oil test pump; for example:

[0064] When the cumulative number of failures of the main lubricating oil pump and the cumulative number of failures of the standby lubricating oil pump are both less than or equal to the preset number of failures, if the cumulative operating duration of the main lubricating oil pump is longer than that of the standby lubricating oil pump, the main lubricating oil pump is used as the lubricating oil test pump; if the cumulative operating duration of the standby lubricating oil pump is longer than that of the main lubricating oil pump, the standby lubricating oil pump is used as the lubricating oil test pump;

[0065] When the cumulative number of failures of the main lubricating oil pump is more than the preset number of failures and the cumulative number of failures of the standby lubricating oil pump is less than or equal to the preset number of failures, the main lubricating oil pump is used as the lubricating oil test pump;

[0066] When the cumulative number of failures of the standby lubricating oil pump is more than the preset number of failures and the cumulative number of failures of the main lubricating oil pump is less than or equal to the preset number of failures, the standby lubricating oil pump is used as the lubricating oil test pump;

[0067] When the cumulative number of failures of the main lubricating oil pump and the cumulative number of failures of the standby lubricating oil pump are both more than the preset number of failures, if the cumulative number of failures of the main lubricating oil pump is more than that of the standby lubricating oil pump, the main lubricating oil pump is used as the lubricating oil test pump; if the cumulative number of failures of the standby lubricating oil pump is more than that of the main lubricating oil pump, the standby lubricating oil pump is used as the lubricating oil test pump;

[0068] When manually setting, it is determined according to the operation and maintenance conditions of the lubricating oil system.

[0069] S6. After the lubricating oil pump operation mode is activated, stop the lubricating oil test pump. When the lubricating oil pump operation mode is activated and the status feedback of the lubricating oil test pump stops, start the lubricating oil running pump in the lubricating oil system. When the lubricating oil pump operation mode is activated, the status feedback of the lubricating oil test pump stops, the status feedback of the lubricating oil running pump is running, and the pressure of the lubricating oil main pipe reaches the preset value of the normal starting main pipe pressure and lasts for a preset time (can be set, such as 60 seconds), then start the high-level oil tank operation mode with a delay of a preset time (can be set, such as 10 seconds), and perform the reset setting of the pressure relief hot standby mode;

[0070] Among them, the lubricating oil running pump is specifically the main lubricating oil pump or the standby lubricating oil pump. Specifically, when the main lubricating oil pump is used as the lubricating oil test pump, the standby lubricating oil pump is used as the lubricating oil running pump; when the standby lubricating oil pump is used as the lubricating oil test pump, the main lubricating oil pump is used as the lubricating oil running pump.

[0071] S7. After the high-level oil tank operation mode is activated, put the high-level oil tank into use and perform the reset setting of the pressure relief hot standby mode. Among them, there are three methods to put the high-level oil tank into use:

[0072] The first method of putting into use: Upgrade the orifice plate.

[0073] Select the largest possible orifice plate to shorten the hot standby oil filling time of the orifice plate. When the liquid level of the high-level oil tank reaches the preset value of the normal starting of the high-level oil tank liquid level (can be set), put the high-level oil tank into use and perform the reset setting of the pressure relief hot standby mode. The advantage of this method is that after the orifice plate is enlarged, the oil filling speed of the lubricating oil high-level oil tank is faster than before the transformation, and the duration for the liquid level of the lubricating oil high-level oil tank to reach the preset value of the normal starting of the high-level oil tank liquid level is shortened. The transformation is simple, the cost is small, and the effect after the transformation is obvious. The disadvantage of this method is that even after the orifice plate is enlarged, it still cannot fundamentally shorten the hot standby oil filling duration because the selection of the orifice plate is restricted by the lubricating oil system pipeline. If the orifice plate is selected too large, it is easy to cause the oil filling volume to be too large when the liquid level of the high-level oil tank enters the microcirculation, and the breathing hole of the high-level oil tank sprays oil. To sum up, this method is suitable for making local transformation and upgrading of existing equipment to shorten the hot standby time under the premise that the transformation of the original lubricating oil high-level oil tank device is not large and the requirement for the hot standby time is acceptable.

[0074] The second method of putting into use: Replace the stop valve of the high-level oil tank with an electric or pneumatic control valve, and put the high-level oil tank into use based on PID control of the control valve;

[0075] The activation mode of the elevated oil tank is activated, the PID control of the elevated oil tank liquid level is enabled, the normal startup preset value of the elevated oil tank liquid level is the set value, the elevated oil tank liquid level is the regulated value, and the regulating valve is the output device. When the elevated oil tank liquid level is lower than the normal startup preset value of the elevated oil tank liquid level, the regulating valve operates; when the elevated oil tank liquid level reaches the normal startup preset value of the elevated oil tank liquid level, the PID control of the elevated oil tank liquid level fails, and the regulating valve closes. When the elevated oil tank liquid level reaches the normal startup preset value of the elevated oil tank liquid level and the regulating valve status feedback is closed, the elevated oil tank is put into use, and the reset setting of the pressure relief hot standby mode is made.

[0076] The specific process of putting the elevated oil tank into use based on the PID control of the regulating valve is as follows:

[0077] Judge whether the elevated oil tank liquid level is lower than the normal startup preset value of the elevated oil tank liquid level;

[0078] If the elevated oil tank liquid level is lower than the normal startup preset value of the elevated oil tank liquid level, control the regulating valve to open and control the regulating valve to operate based on PID;

[0079] If the elevated oil tank liquid level is higher than or equal to the normal startup preset value of the elevated oil tank liquid level, control the regulating valve to close;

[0080] When the elevated oil tank liquid level reaches the normal startup preset value and the regulating valve status feedback is closed, put the elevated oil tank into use;

[0081] Specifically, the method of controlling the regulating valve to operate based on PID is as follows:

[0082] When the elevated oil tank liquid level is within the range of [0, A1%] of the normal startup preset value of the elevated oil tank liquid level, reduce the proportional control and shorten the integral time control;

[0083] When the elevated oil tank liquid level is within the range of (A1%, A2%] of the normal startup preset value of the elevated oil tank liquid level, increase the proportional control and lengthen the integral time control;

[0084] When the elevated oil tank liquid level is within the range of (A2%, 1] of the normal startup preset value of the elevated oil tank liquid level, reduce the proportional control and lengthen the integral time control;

[0085] Among them, both A1 and A2 can be set, and A1 < A2.

[0086] For the PID control of the elevated oil tank liquid level, the P and I parameters can be set in a three-way manner. For example:

[0087] When the elevated oil tank liquid level is within the range of [0, 33%] of the normal startup preset value of the elevated oil tank liquid level, the proportional action is made smaller and the integral time is shortened; that is, the PID control is adjusted to reach the set value in a very short time, and the overshoot will not be too large to cause the oil pressure to drop, and the lubricating oil pump starts.

[0088] When the liquid level of the high-level oil tank is within the range of (33, 66%] of the preset value for normal startup of the high-level oil tank, the proportional action is increased and the integral time is lengthened; at this time, the overshoot can gradually increase to quickly reach the set value. By adjusting the PID control within a certain period of time, the system fluctuations caused by the increase in overshoot can be offset.

[0089] When the liquid level of the high-level oil tank is within the range of (66, 100%] of the preset value for normal startup of the high-level oil tank, the proportional action is decreased and the integral time is lengthened. At this time, the overshoot can gradually decrease to quickly fine-tune to the set value. By adjusting the PID control within a certain period of time, the function of precise fine-tuning can be achieved.

[0090] The advantage of this method is that it adopts closed-loop PID control, and the P and I parameters are preset in three ranges to accurately control the liquid level of the high-level lubricating oil tank. It can accurately control in a timely manner under steady-state conditions.

[0091] The disadvantage of this method is that its anti-interference ability is weak and it depends strongly on the stable flow rate of the lubricating oil. Once there is a disturbance in the lubricating oil flow, the PID control requires a long time for rebalancing, and unnecessary interference may be caused during this period.

[0092] In summary, this method is applicable under the conditions that the lubricating oil system equipment is normal, operates stably, and reaches a steady state. While quickly filling the high-level lubricating oil tank, it can accurately achieve the condition that the liquid level of the high-level lubricating oil tank reaches the preset value, and can achieve fully automatic oil filling, thereby achieving the effect of one-key hot standby.

[0093] The third method of commissioning: Replace the stop valve of the high-level oil tank with an electric or pneumatic control valve, and commission the high-level oil tank based on the split-range control of the control valve;

[0094] The specific process of commissioning the high-level oil tank based on the split-range control of the control valve is as follows:

[0095] When the liquid level of the high-level oil tank is within the range of [0, B1%] of the preset value for normal startup of the high-level oil tank, the valve position of the control valve is set to gradually increase to C1% in a gradient manner;

[0096] When the liquid level of the high-level oil tank is within the range of (B1%, B2%] of the preset value for normal startup of the high-level oil tank, the valve position of the control valve is gradually increased to C2% in a gradient manner;

[0097] When the liquid level of the high-level oil tank is within the range of (B2%, B3%] of the preset value for normal startup of the high-level oil tank, the valve position of the control valve is gradually increased to C3% in a gradient manner;

[0098] When the liquid level of the high-level oil tank is within the range of (B3%, B4%] of the preset value for normal startup of the high-level oil tank, the valve position of the control valve is set to gradually decrease to C4% in a gradient manner;

[0099] When the liquid level of the high-level oil tank is within the range of (B4%, 1] of the normal start-up preset value of the high-level oil tank liquid level, the valve position of the regulating valve is set to 0%.

[0100] If the liquid level of the high-level oil tank reaches the normal start-up preset value of the high-level oil tank liquid level and the regulating valve status feedback is closed, put the high-level oil tank into use.

[0101] Among them, B1 < B2 < B3 < B4, C1 < C2 < C3, C4 < C3.

[0102] Activate the high-level oil tank operation mode and enable the split-range control of the regulating valve; for example:

[0103] When the liquid level of the high-level oil tank is within the range of [0, 30%] of the normal start-up preset value of the high-level oil tank liquid level, the valve position of the regulating valve is set to gradually increase to 30% in gradient;

[0104] When the liquid level of the high-level oil tank is within the range of (30%, 50%] of the normal start-up preset value of the high-level oil tank liquid level, the valve position of the regulating valve is gradually increased to 50% in gradient;

[0105] When the liquid level of the high-level oil tank is within the range of (50%, 80%] of the normal start-up preset value of the high-level oil tank liquid level, the valve position of the regulating valve is gradually increased to 80% in gradient;

[0106] When the liquid level of the high-level oil tank is within the range of (80%, 95%] of the normal start-up preset value of the high-level oil tank liquid level, the valve position of the regulating valve is set to gradually decrease to 50% in gradient;

[0107] When the liquid level of the high-level oil tank is within the range of (95%, 100%] of the normal start-up preset value of the high-level oil tank liquid level, the valve position of the regulating valve is set to 0% (setting the valve position of the regulating valve to 0% means closing the regulating valve);

[0108] When the liquid level of the high-level oil tank reaches the normal start-up preset value of the high-level oil tank liquid level and the regulating valve status feedback is closed, put the high-level oil tank into use and perform the reset setting of the pressure relief hot standby mode.

[0109] The split-range control method adopted for the liquid level of the lubricating oil high-level oil tank and the output of the regulating valve is based on the results calibrated manually during the commissioning of the lubricating oil high-level oil tank system. That is, multiple experiments are required before production to obtain the corresponding data of the liquid level of the lubricating oil high-level oil tank and the output of the regulating valve.

[0110] After adopting this method, while quickly filling the lubricating oil high-level oil tank, it can accurately achieve the condition that the liquid level of the lubricating oil high-level oil tank reaches the preset value, and can realize fully automatic oil filling, thereby achieving the effect of one-key hot standby.

[0111] The above are the steps for establishing the pressure-relief hot standby mode. Next, the steps for establishing the pressure-maintaining hot standby mode will be explained.

[0112] When the preset conditions for the pressure-maintaining hot standby are met, the steps for establishing the pressure-maintaining hot standby mode are executed; the specific preset conditions for the pressure-maintaining hot standby are that the electric valves for the instrument air inlet of the dry gas seal disc, the electric valves for the instrument air inlet of the motor purge pipeline, the electric valves at the inlet of the dry gas seal booster skid, the compressor inlet loading valve, and the compressor vent valve are in the remote control state, there is no fault alarm state, and there is no timeout alarm state; at the same time, the exhaust fan of the lubricating oil tank, the heater of the lubricating oil tank, the main lubricating oil pump, and the standby lubricating oil pump are in the remote control state and there is no fault alarm state.

[0113] The steps for establishing the pressure-maintaining hot standby mode include the above S1 to S7. After S7, the dry gas seal system commissioning mode is started after a preset time delay.

[0114] S8, when the dry gas seal system commissioning mode is activated, open the pneumatic valve at the inlet of the dry gas seal; when the dry gas seal system commissioning mode is activated, the feedback of the pneumatic valve at the inlet of the dry gas seal is fully open, the flow rate of the primary seal gas at the drive end is higher than the low alarm preset value (can be set), and the flow rate of the primary seal gas at the non-drive end is higher than the low alarm preset value (can be set), start the compressor pipeline purging mode after a preset time delay (can be set, for example, 10 seconds), and make the reset setting for the pressure-maintaining hot standby mode;

[0115] S9, when the compressor pipeline purging mode is activated, open the vent valve and the inlet loading valve; when the compressor pipeline purging mode is activated, the feedback of the vent valve is fully open, and the feedback of the inlet loading valve is fully open, start the compressor pipeline pressure equalization mode after a preset time delay (can be set, for example, 1200 seconds), and make the reset setting for the pressure-maintaining hot standby mode;

[0116] S10, when the compressor pipeline pressure equalization mode is activated, close the compressor vent valve, and make the reset setting for the pressure-maintaining hot standby mode.

[0117] The steps for establishing the pressure-maintaining hot standby mode are based on the steps for establishing the pressure-relief hot standby mode and add the dry gas seal system commissioning mode, the compressor pipeline purging mode, and the compressor pipeline pressure equalization mode.

[0118] Switching from the pressure-relief hot standby mode to the pressure-maintaining hot standby mode:

[0119] Among them, when the pressure-relief hot standby mode is being put into use, if the preset conditions for the pressure-maintaining hot standby are met, the pressure-relief hot standby mode is switched to the pressure-maintaining hot standby mode by setting a manual switching function. The switching process is to add the above S8 to S10 on the basis of the establishment of the pressure-relief hot standby mode.

[0120] II. Commissioning of the hot standby mode.

[0121] After the establishment of the pressure-relief hot standby mode, the one-key hot standby control method for the natural gas long-distance pipeline compressor further includes a step of putting the pressure-relief hot standby mode into use;

[0122] When the pressure of the compressor isolation gas reaches the preset value of the normal startup pressure, the motor positive-pressure ventilation is in the leakage compensation mode, the liquid level of the elevated oil tank reaches the preset value of the normal startup of the elevated oil tank liquid level, the temperature of the lubricating oil tank is higher than the preset value of the low alarm of the oil tank temperature, the pressure of the lubricating oil main pipe reaches the preset value of the normal startup main pipe pressure, the status feedback of the lubricating oil operating pump is running, and the status feedback of the lubricating oil test pump is stopped, the pressure-relief hot standby mode is put into use.

[0123] After the establishment of the pressure-maintaining hot standby mode, the one-key hot standby control method for the natural gas long-distance pipeline compressor further includes a step of putting the pressure-maintaining hot standby mode into use;

[0124] On the basis of putting the pressure-relief hot standby mode into use, it is increased that the pneumatic valve at the inlet of the dry gas seal feedbacks fully open, the compressor inlet loading valve feedbacks fully open, the compressor vent valve feedbacks fully closed, and the differential pressure before and after the compressor inlet loading valve is lower than the preset value of the low differential pressure alarm (can be set).

[0125] III. Process monitoring of the hot standby mode.

[0126] During the establishment of the pressure-relief hot standby mode, the one-key hot standby control method for the natural gas long-distance pipeline compressor further includes a step of monitoring the process of the pressure-relief hot standby mode.

[0127] As Figure 2 shown, the specific steps of monitoring the process of the pressure-relief hot standby mode are as follows:

[0128] S100, monitoring the operation mode of the instrument air system;

[0129] The specific method for monitoring the operation mode of the instrument air system is that when the operation mode of the instrument air system is activated, if the fully open feedback of the instrument air inlet electric valve of the dry gas seal disc or the instrument air inlet electric valve of the motor purge pipeline is not detected within the preset time period (can be set, for example, 90 seconds), or if the fully open feedback of the instrument air inlet electric valve of the dry gas seal disc is detected and the pressure of the compressor isolation gas reaching the normal pressure preset value is not detected within the preset time period, then the operation mode of the instrument air system fails;

[0130] For example:

[0131] The operation mode of the instrument air system is activated. If the fully open feedback of the instrument air inlet electric valve of the dry gas seal disc is not detected within 90 seconds (can be set), the opening of the instrument air inlet electric valve of the dry gas seal disc fails, and the operation mode of the instrument air system fails;

[0132] Or, when the instrument air system startup mode is activated, if the feedback of the motor purge line instrument air inlet electric valve being fully open is not detected within 90 seconds (settable), the opening of the motor purge line instrument air inlet electric valve fails, and the instrument air system startup mode fails;

[0133] Or, when the instrument air system startup mode is activated and the feedback of the dry gas seal disk instrument air inlet electric valve being fully open, if the compressor isolation gas pressure does not reach the normal pressure preset value (settable) within 20 seconds (settable), the startup of the compressor isolation gas fails, and the instrument air system startup mode fails.

[0134] S200, Monitoring of the lubricating oil pump pre-test mode;

[0135] The specific method for monitoring the lubricating oil pump pre-test mode is to shield the failure signal of the instrument air system startup mode. When the lubricating oil pump pre-test mode is activated, if the status feedback of the main lubricating oil pump or the standby lubricating oil pump stopping is not detected within the preset time period, the lubricating oil pump pre-test mode fails;

[0136] For example:

[0137] When the lubricating oil pump pre-test mode is activated, if the status feedback of the main lubricating oil pump stopping is not detected within 60 seconds (settable), the stopping of the main lubricating oil pump fails, and the lubricating oil pump pre-test mode fails;

[0138] Or, when the lubricating oil pump pre-test mode is activated, if the status feedback of the standby lubricating oil pump stopping is not detected within 60 seconds (settable), the stopping of the standby lubricating oil pump fails, and the lubricating oil pump pre-test mode fails.

[0139] S300, Monitoring of the exhaust fan startup mode;

[0140] The specific method for monitoring the exhaust fan startup mode is to shield the failure signal of the lubricating oil pump pre-test mode. When the exhaust fan startup mode is activated, if the status feedback of the lubricating oil tank exhaust fan running is not detected within the preset time period, the exhaust fan startup mode fails;

[0141] For example:

[0142] When the exhaust fan startup mode is activated, if the status feedback of the lubricating oil tank exhaust fan running is not detected within 60 seconds (settable), the startup of the lubricating oil tank exhaust fan fails, and the exhaust fan startup mode fails.

[0143] S400, Monitoring of the lubricating oil tank heater startup mode;

[0144] The specific method for monitoring the activation mode of the lubricating oil tank heater is to shield the failure signal of the activation mode of the smoke exhaust fan. After the activation mode of the lubricating oil tank heater is activated, if the status feedback operation of the lubricating oil tank heater is not detected within the preset time period, or if the lubricating oil tank temperature is not detected to be higher than the preset value of the low oil tank temperature alarm within the preset time period, the activation mode of the lubricating oil tank heater fails;

[0145] For example:

[0146] The activation mode of the lubricating oil tank heater is activated. If the status feedback operation of the lubricating oil tank heater is not detected within 60 seconds (settable), the activation of the lubricating oil tank heater fails, and the activation mode of the lubricating oil tank heater fails;

[0147] Or, the activation mode of the lubricating oil tank heater is activated. If the lubricating oil tank temperature is not detected to be higher than the preset value of the low oil tank temperature alarm (settable) within 7200 seconds (settable), the establishment of the lubricating oil tank temperature fails, and the activation mode of the lubricating oil tank heater fails.

[0148] S500, monitoring of the lubricating oil pump test mode;

[0149] The specific method for monitoring the lubricating oil pump test mode is to shield the failure signal of the activation mode of the lubricating oil tank heater. After the lubricating oil pump test mode is activated, if the status feedback operation of the lubricating oil test pump is not detected within the preset time period, the lubricating oil pump test mode fails; or if the status feedback operation of the lubricating oil test pump is detected and the lubricating oil main pipe pressure is not detected to reach the preset value of the normal starting main pipe pressure within the preset time period, the lubricating oil pump test mode fails;

[0150] For example:

[0151] The lubricating oil pump test mode is activated. If the status feedback operation of the lubricating oil test pump is not detected within 60 seconds (settable), the activation of the lubricating oil test pump fails, and the lubricating oil pump test mode fails;

[0152] Or, the lubricating oil pump test mode is activated, and the status feedback operation of the lubricating oil test pump is detected. If the lubricating oil main pipe pressure is not detected to reach the preset value of the normal starting main pipe pressure within 60 seconds (settable), the establishment of the lubricating oil system main pipe oil pressure fails, and the lubricating oil pump test mode fails.

[0153] S600, monitoring of the lubricating oil pump activation mode;

[0154] The specific method for monitoring the lubricating oil pump commissioning mode is to shield the lubricating oil pump test mode failure signal. After the lubricating oil pump commissioning mode is activated, if the lubricating oil test pump status feedback stop is not detected within the preset time period, or if the lubricating oil test pump status feedback stops and the lubricating oil running pump status feedback running is not detected within the preset time period, or if the lubricating oil running pump status feedback runs and the lubricating oil main pipe pressure does not reach the normal startup main pipe pressure preset value within the preset time period, then the lubricating oil pump commissioning mode fails;

[0155] For example:

[0156] When the lubricating oil pump commissioning mode is activated, if the lubricating oil test pump status feedback stop is not detected within 60 seconds (can be set), then the lubricating oil test pump stop fails and the lubricating oil pump commissioning mode fails;

[0157] Or, when the lubricating oil pump commissioning mode is activated and the lubricating oil test pump status feedback stops, if the lubricating oil running pump status feedback running is not detected within 60 seconds (can be set), then the lubricating oil running pump commissioning fails and the lubricating oil pump commissioning mode fails;

[0158] Or, when the lubricating oil pump commissioning mode is activated and the lubricating oil running pump status feedback runs, if the lubricating oil main pipe pressure does not reach the normal startup main pipe pressure preset value within 60 seconds (can be set), then the establishment of the lubricating oil system main pipe oil pressure fails and the lubricating oil pump commissioning mode fails.

[0159] S700, monitoring the high-level oil tank commissioning mode;

[0160] The specific method for monitoring the high-level oil tank commissioning mode is to shield the lubricating oil pump commissioning mode failure signal. After the high-level oil tank commissioning mode is activated, if the motor positive pressure ventilation status feedback leakage compensation mode is not detected within the preset time period, or if the high-level oil tank liquid level does not reach the high-level oil tank liquid level normal startup preset value within the preset time period, then the high-level oil tank commissioning mode fails;

[0161] For example:

[0162] When the high-level oil tank commissioning mode is activated, if the motor positive pressure ventilation status feedback leakage compensation mode is not detected within 600 seconds (can be set), then the establishment of the motor positive pressure ventilation leakage compensation mode fails and the high-level oil tank commissioning mode fails.

[0163] Or, when the high-level oil tank commissioning mode is activated, if the high-level oil tank liquid level does not reach the high-level oil tank liquid level normal startup preset value within 1800 seconds (can be set), then the oil filling of the high-level lubricating oil tank fails and the high-level oil tank commissioning mode fails.

[0164] S800, monitoring the pressure relief hot standby mode;

[0165] The specific method of hot standby mode monitoring is that if at least one of the instrument air system commissioning mode, lubricating oil pump pre-test mode, smoke exhaust fan commissioning mode, lubricating oil tank heater commissioning mode, lubricating oil pump test mode, lubricating oil pump commissioning mode and high-level oil tank commissioning mode fails, the pressure relief hot standby mode commissioning failure is triggered;

[0166] After the pressure relief hot standby mode fails to be put into use, the specific failure time and failure reason shall be recorded;

[0167] For example, the format for recording the specific failure time and failure reason is:

[0168] At XX:XX:XX:XX on XX:XX:XX on XX:XX:XX, the pressure relief hot standby mode failed to be put into operation, the instrument air system commissioning mode failed, and the dry gas sealing disk instrument air inlet electric valve failed to open.

[0169] During the process of establishing the pressure-maintaining hot standby mode, the one-key hot standby control method for a natural gas long-distance pipeline compressor further includes a pressure-maintaining hot standby mode process monitoring step.

[0170] Based on the pressure relief hot standby mode monitoring, the pressure maintaining hot standby mode process monitoring adds the dry gas sealing system commissioning mode, the compressor pipeline purge mode and the compressor pipeline pressure equalization mode process monitoring.

[0171] S900, dry gas seal system commissioning mode monitoring;

[0172] The specific method of monitoring the dry gas sealing system commissioning mode is to shield the high-level oil tank commissioning mode failure signal. When the dry gas sealing system commissioning mode is activated, if the dry gas sealing inlet pneumatic valve feedback is not detected to be fully open within a preset time period, the dry gas sealing system commissioning mode fails.

[0173] For example:

[0174] When the dry gas sealing system commissioning mode is activated, if the dry gas sealing inlet pneumatic valve feedback of full opening is not detected within 60 seconds (settable), the dry gas sealing inlet pneumatic valve fails to open and the dry gas sealing system commissioning mode fails.

[0175] S1000, compressor line purge mode monitoring;

[0176] The specific method of monitoring the compressor pipeline purge mode is to shield the dry gas sealing system commissioning mode failure signal. When the compressor pipeline purge mode is activated, if the compressor vent valve feedback is not detected to be fully open within a preset time period, or if the compressor inlet loading valve feedback is not detected to be fully open within a preset time period, the compressor pipeline purge mode fails;

[0177] For example:

[0178] When the compressor pipeline purging mode is activated, if the full-open feedback of the compressor vent valve is not detected within 60 seconds (settable), the opening of the compressor vent valve fails and the compressor pipeline purging mode fails;

[0179] Or, when the compressor pipeline purging mode is activated, if the full-open feedback of the compressor inlet loading valve is not detected within 60 seconds (settable), the opening of the compressor inlet loading valve fails and the compressor pipeline purging mode fails.

[0180] S1100, Monitoring the equalizing pressure mode of the compressor pipeline;

[0181] The specific method for monitoring the equalizing pressure mode of the compressor pipeline is to shield the failure signal of the compressor pipeline purging mode. When the equalizing pressure mode of the compressor pipeline is activated, if the full-closed feedback of the compressor vent valve is not detected within a preset time period, or if the differential pressure before and after the compressor inlet loading valve is not detected to be lower than the preset value of the low differential pressure alarm within a preset time period, the equalizing pressure mode of the compressor pipeline fails;

[0182] For example:

[0183] When the equalizing pressure mode of the compressor pipeline is activated, if the full-closed feedback of the compressor vent valve is not detected within 60 seconds (settable), the closing of the compressor vent valve fails and the equalizing pressure mode of the compressor pipeline fails;

[0184] Or, when the equalizing pressure mode of the compressor pipeline is activated, if the differential pressure before and after the compressor inlet loading valve is not detected to be lower than the preset value of the low differential pressure alarm (settable) within 1500 seconds (settable), the establishment of the differential pressure before and after the inlet loading valve fails and the equalizing pressure mode of the compressor pipeline fails.

[0185] S1200, Monitoring the pressure-holding hot standby mode;

[0186] The specific method for monitoring the pressure-holding hot standby mode is that if at least one of the instrument air system operation mode, lubricating oil pump pre-test mode, exhaust gas fan operation mode, lubricating oil tank heater operation mode, lubricating oil pump test mode, lubricating oil pump operation mode, elevated oil tank operation mode, dry gas seal system operation mode, compressor pipeline purging mode, and compressor pipeline equalizing pressure mode fails, the activation of the pressure-holding hot standby mode fails; after the activation of the pressure-holding hot standby mode fails, record the specific failure time and cause of failure.

[0187] For example:

[0188] At XX:XX:XX on XX / XX / XX, the activation of the pressure-holding hot standby mode fails, and the instrument air system operation mode fails, and the opening of the instrument air inlet electric valve of the dry gas seal disc fails.

[0189] IV. Reset of the hot standby mode.

[0190] The failure of pressure relief hot standby, or the compressor entering the startup process, or the failure after the successful application of the pressure relief hot standby mode triggers the reset of the pressure relief hot standby mode.

[0191] The failure of pressure holding hot standby, or the compressor entering the activation process, or the failure after the successful application of the pressure holding hot standby mode triggers the reset of the pressure holding hot standby mode.

[0192] Based on the above one-key hot standby control method for compressors in natural gas long-distance pipelines, the present invention also provides a one-key hot standby control device for compressors in natural gas long-distance pipelines.

[0193] A one-key hot standby control device for compressors in natural gas long-distance pipelines includes a memory and a processor. A computer program is stored in the memory, and when the computer program is executed by the processor, it realizes the one-key hot standby control method for compressors in natural gas long-distance pipelines as described above.

[0194] In the present invention:

[0195] To realize fully automatic hot standby of the compressor, through the research on the compressor lubricating oil system, three methods are designed for the application of the elevated oil tank, which can provide solutions for systems with different requirements. Method 1 can shorten the application time of the elevated oil tank, and the transformation is simple and the cost is low; Method 2 adopts a classic PID closed-loop control, and the P and I parameters are effectively set to accurately control the liquid level of the elevated oil tank and effectively shorten the application time of the elevated oil tank; Method 3 adopts open-loop split-range control. Through multiple on-site manual experiments and calibrations, effective data on the liquid level of the lubricating oil elevated oil tank and the output of the regulating valve are obtained, avoiding excessive output when the regulating valve supplies oil, resulting in too low pressure in the lubricating oil main pipe and interlocking to start the standby lubricating oil pump, which affects the operation of the lubricating oil system.

[0196] To meet the requirements of flexible scheduling and rapid load increase and decrease of the compressor unit in the natural gas long-distance pipeline, two one-key hot standby modes of pressure relief hot standby and pressure holding hot standby are specially set. Pressure relief hot standby can effectively reduce the hot standby duration and realize real-time hot standby of the compressor. Pressure holding hot standby can effectively reduce the time for pipeline replacement purging and pressure equalization during the startup process of the compressor, and can realize real-time hot standby and rapid startup of the compressor, which has a doubled effect on compressor stations with emergency startup tasks.

[0197] For the real-time and reliable application of the dynamic equipment of the auxiliary system during the operation of the compressor, during the establishment and application of the hot standby mode before the compressor starts, the key dynamic equipment of the auxiliary system is tested. A lubricating oil pump test mode is set, which can be automatically set or manually set through three judgment methods to select the lubricating oil test pump and the lubricating oil operating pump, ensuring the safe and stable operation of the lubricating oil operating pump during the operation of the compressor, and the reliable standby of the lubricating oil test pump. If the lubricating oil operating pump suddenly fails, the lubricating oil test pump can be immediately started to maintain the stability of the pressure in the lubricating oil main pipe.

[0198] To shorten the hot standby time, through process research, a complete set of methods for putting the hot standby mode into use has been invented. Multiple threads are used to put the various devices into operation in parallel. During the process of putting them into use, monitoring is carried out simultaneously. The hot standby mode is optimized and there is no interference among them, thus solving the problem of overly long waiting time in the previous sequential control. When the activation mode of the instrument air system is activated, the motor positive pressure ventilation enters the purging mode. Usually, it needs to be purged for 30 minutes and then enters the leakage compensation mode to meet the conditions for putting the hot standby mode into use. To shorten the hot standby time, the purging of the motor positive pressure ventilation and other devices in the auxiliary system are run in multiple threads, saving the time for the motor positive pressure ventilation to enter the leakage compensation mode for commissioning.

[0199] During the establishment and commissioning process of the compressor hot standby mode, the whole process is monitored and recorded in real time. First, record the specific time when the commissioning of the hot standby mode fails. Second, record the specific reasons for the failure of the commissioning of the hot standby mode. In this way, the specific reasons for the hot standby failure can be quickly judged and the faulty equipment in the auxiliary system can be quickly located, so as to timely handle on-site faults and put the compressor hot standby mode into use.

[0200] The present invention relates to a one-key hot standby control method and device for compressors in a natural gas long-distance pipeline, which realizes one-key hot standby of the compressor without manual operation, realizes one-key full-automatic startup of the compressor, shortens the hot standby time and startup time at the same time, realizes real-time hot standby and rapid startup of compressors in a compressor station, realizes one-key full-automatic commissioning of a compressor station, and lays a foundation for the construction of an unmanned station yard. It is applicable to compressor systems with a high-position oil tank configured in the auxiliary system of a natural gas long-distance pipeline system, and is also applicable to systems with a high-position oil tank configured in the compressor auxiliary systems of refinery and chemical plants. It is also applicable to compressor stations with requirements for real-time hot standby and rapid startup of compressors and with emergency startup tasks. For compressor systems with a high-position oil tank configured in the auxiliary system, it can be used as a standard for a complete set of one-key hot standby control methods and devices for compressors in a natural gas long-distance pipeline, and can be applied to newly built and renovated compressor stations with one-key start-stop functions in the later stage.

[0201] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A one-key hot standby control method for a compressor in a long-distance natural gas pipeline, characterized in that: The one-key hot standby control method for natural gas long-distance pipeline compressors is used to automatically test and start the auxiliary system of natural gas long-distance pipeline compressors; among them, the auxiliary system includes an instrument air system, a dry gas seal system, and a lubricating oil system configured with a high-level oil tank; The one-key hot standby control method for natural gas long-distance pipeline compressors includes a hot standby mode establishment step; among them, the hot standby mode is any one of the pressure relief hot standby mode and the pressure maintenance hot standby mode; when the pressure relief hot standby preset conditions are met, the pressure relief hot standby mode establishment step is executed; the specific steps of the pressure relief hot standby mode establishment step are as follows: S1, Start the instrument air system commissioning mode to activate the instrument air system commissioning mode; after the instrument air system commissioning mode is activated, open the instrument air inlet electric valve for the dry gas seal disc in the instrument air system to allow the instrument air in the compressor isolation gas pipeline in the instrument air system to enter, so that the compressor isolation gas pressure reaches the preset value of the normal start-up pressure; at the same time, open the instrument air inlet electric valve for the motor purge pipeline in the instrument air system to allow the instrument air in the motor purge pipeline in the instrument air system to enter, so that the motor positive pressure ventilation enters the purge mode; and open the inlet electric valve for the dry gas seal booster skid in the instrument air system to allow the pipeline of the dry gas seal booster skid to intake air; when the instrument air inlet electric valve for the dry gas seal disc feedbacks fully open, the status feedback of the instrument air inlet electric valve for the motor purge pipeline is fully open, the inlet electric valve for the dry gas seal booster skid feedbacks fully open, and the pressure of the dry gas seal booster skid pipeline and the compressor isolation gas pressure reach the preset value of the normal start-up pressure, delay the preset time to start the lubricating oil pump pre-test mode; S2, When the lubricating oil pump pre-test mode is activated, stop the main lubricating oil pump and the standby lubricating oil pump in the lubricating oil system; when the lubricating oil pump pre-test mode is activated, the status feedback of the main lubricating oil pump stops and the status feedback of the standby lubricating oil pump stops, delay the preset time to start the smoke exhaust fan commissioning mode; S3, When the smoke exhaust fan commissioning mode is activated, start the smoke exhaust fan of the lubricating oil tank in the lubricating oil system; when the smoke exhaust fan commissioning mode is activated and the status feedback of the smoke exhaust fan of the lubricating oil tank is running, delay the preset time to start the lubricating oil tank heater commissioning mode; S4, When the lubricating oil tank heater commissioning mode is activated, start the lubricating oil tank heater in the lubricating oil system; when the lubricating oil tank heater commissioning mode is activated, the status feedback of the lubricating oil tank heater is running and the temperature of the lubricating oil tank is higher than the preset value of the low oil tank temperature alarm, delay the preset time to start the lubricating oil pump test mode; S5, When the lubricating oil pump test mode is activated, and the conditions for allowing the lubricating oil pump to start are met, the compressor is not running, and the compressor has not entered the start-up process, start the lubricating oil test pump in the lubricating oil system; when the lubricating oil pump test mode is activated, the status feedback of the lubricating oil test pump is running, and the pressure of the lubricating oil main pipe reaches the preset value of the normal start-up main pipe pressure and lasts for the preset time, delay the preset time to start the lubricating oil pump commissioning mode; S6. After the lubricating oil pump commissioning mode is activated, stop the lubricating oil test pump; when the lubricating oil pump commissioning mode is activated and the status feedback of the lubricating oil test pump stops, start the lubricating oil running pump in the lubricating oil system; when the lubricating oil pump commissioning mode is activated, the status feedback of the lubricating oil test pump stops, the status feedback of the lubricating oil running pump is running, and the lubricating oil main pipe pressure reaches the normal starting machine main pipe pressure preset value and lasts for the preset time, start the overhead tank commissioning mode after a preset time delay; S7. After the overhead tank commissioning mode is activated, commission the overhead tank.

2. The one-key hot standby control method for a compressor in a long-distance natural gas pipeline according to claim 1, characterized in that: When the preset conditions for pressure-holding hot standby are met, perform the steps for establishing the pressure-holding hot standby mode; the steps for establishing the pressure-holding hot standby mode include the above S1 to S7. After S7, start the dry gas seal system commissioning mode after a preset time delay; S8. After the dry gas seal system commissioning mode is activated, open the pneumatic valve at the dry gas seal inlet; when the dry gas seal system commissioning mode is activated, the feedback of the pneumatic valve at the dry gas seal inlet is fully open, the flow rate of the primary seal gas at the drive end is higher than the low alarm preset value, and the flow rate of the primary seal gas at the non-drive end is higher than the low alarm preset value, start the compressor pipeline purging mode after a preset time delay; S9. After the compressor pipeline purging mode is activated, open the vent valve and the inlet loading valve; when the compressor pipeline purging mode is activated, the feedback of the vent valve is fully open, and the feedback of the inlet loading valve is fully open, start the compressor pipeline pressure equalization mode after a preset time delay; S10. After the compressor pipeline pressure equalization mode is activated, close the compressor vent valve; Among them, when performing the pressure relief hot standby mode commissioning, if the preset conditions for pressure-holding hot standby are met, switch the pressure relief hot standby mode to the pressure-holding hot standby mode by setting a manual switching function. The switching process is to add the above S8 to S10 on the basis of the establishment of the pressure relief hot standby mode. The preset conditions for the pressure relief hot standby are specifically that the pneumatic valve for dry gas seal panel instrument air inlet, the pneumatic valve for motor purge pipeline instrument air inlet, and the electric valve at the inlet of the dry gas seal booster skid in the instrument air system are in the remote control state, without fault alarm and without timeout alarm; at the same time, the lubricating oil tank exhaust fan, the lubricating oil tank heater, the main lubricating oil pump, and the standby lubricating oil pump in the lubricating oil system are in the remote control state and without fault alarm; 3. The one-key hot standby control method for the compressor of the long-distance natural gas pipeline according to claim 2, wherein: The preset conditions for the pressure-holding hot standby are specifically that the pneumatic valve for dry gas seal panel instrument air inlet, the pneumatic valve for motor purge pipeline instrument air inlet, the electric valve at the inlet of the dry gas seal booster skid, the compressor inlet loading valve, and the compressor vent valve are in the remote control state, without fault alarm and without timeout alarm; at the same time, the lubricating oil tank exhaust fan, the lubricating oil tank heater, the main lubricating oil pump, and the standby lubricating oil pump are in the remote control state and without fault alarm. The lubricating oil test pump is selected from the main lubricating oil pump and the standby lubricating oil pump in the lubricating oil system. The process of selecting the lubricating oil test pump is manual selection or automatic selection; the method for automatically selecting the lubricating oil test pump is to select according to the cumulative operation duration or / and the cumulative number of faults; 4. The one-key hot standby control method for the compressor of the long-distance natural gas pipeline according to claim 1, characterized in that: When selecting the lubricating oil test pump according to the cumulative operation duration, select the lubricating oil pump with a longer cumulative operation duration as the lubricating oil test pump; ​ When selecting a lubricating oil test pump based on the cumulative number of failures, the lubricating oil pump with a larger cumulative number of failures is used as the lubricating oil test pump; When selecting a lubricating oil test pump based on the cumulative operating duration and the cumulative number of failures, if the cumulative number of failures of the main lubricating oil pump and the cumulative number of failures of the standby lubricating oil pump are both less than or equal to the preset number of failures, the lubricating oil pump with a longer cumulative operating duration is used as the lubricating oil test pump; If the cumulative number of failures of the main lubricating oil pump or / and the cumulative number of failures of the standby lubricating oil pump is more than the preset number of failures, the lubricating oil pump with a larger cumulative number of failures is used as the lubricating oil test pump; Wherein, the lubricating oil pump is the main lubricating oil pump or the standby lubricating oil pump; When the main lubricating oil pump is used as the lubricating oil test pump, the standby lubricating oil pump is used as the lubricating oil operation pump; when the standby lubricating oil pump is used as the lubricating oil test pump, the main lubricating oil pump is used as the lubricating oil operation pump.

5. The one-key hot standby control method for a natural gas long-distance pipeline compressor according to claim 1, characterized in that: In the S7, before putting the elevated oil tank into use, the following steps are further included: increasing the orifice plate of the elevated oil tank.

6. The one-key hot standby control method for the compressor of the long-distance natural gas pipeline according to claim 1, wherein: In the S7, before putting the elevated oil tank into use, the following steps are further included: replacing the stop valve of the elevated oil tank with an electric or pneumatic control valve, and putting the elevated oil tank into use based on PID control of the control valve; The specific process of putting the elevated oil tank into use based on PID control of the control valve is: Judge whether the liquid level of the elevated oil tank is lower than the preset value for normal startup of the elevated oil tank liquid level; If the liquid level of the elevated oil tank is lower than the preset value for normal startup of the elevated oil tank liquid level, control the control valve to open and control the action of the control valve based on PID; If the liquid level of the elevated oil tank is higher than or equal to the preset value for normal startup of the elevated oil tank liquid level, control the control valve to close; When the liquid level of the elevated oil tank reaches the preset value for normal startup and the status feedback of the control valve is closed, put the elevated oil tank into use; Specifically, the method of controlling the action of the control valve based on PID is: When the liquid level of the elevated oil tank is within the range of [0, A1%] of the preset value for normal startup of the elevated oil tank liquid level, reduce the proportional control and shorten the integral time control; When the liquid level of the elevated oil tank is within the range of (A1%, A2%] of the preset value for normal startup of the elevated oil tank liquid level, increase the proportional control and lengthen the integral time control; When the liquid level of the elevated oil tank is within the range of (A2%, 1] of the preset value for normal startup of the elevated oil tank liquid level, reduce the proportional control and lengthen the integral time control; Wherein, A1 < A2.

7. The one-key hot standby control method for the compressor of the long-distance natural gas pipeline according to claim 1, characterized in that: In the S7, before putting the elevated oil tank into use, the following steps are further included: replacing the stop valve of the elevated oil tank with an electric or pneumatic control valve, and putting the elevated oil tank into use based on split-range control of the control valve; The specific process of putting the elevated oil tank into use based on split-range control of the control valve is: When the liquid level of the elevated oil tank is within the range of [0, B1%] of the preset value for normal startup of the elevated oil tank liquid level, set the valve position of the control valve to gradually increase to C1% in a gradient manner; When the liquid level of the elevated oil tank is within the range of (B1%, B2%] of the preset value for normal startup of the elevated oil tank liquid level, set the valve position of the control valve to gradually increase to C2% in a gradient manner; When the liquid level of the elevated oil tank is within the range of (B2%, B3%] of the preset value for normal startup of the elevated oil tank liquid level, set the valve position of the control valve to gradually increase to C3% in a gradient manner; When the liquid level of the elevated oil tank is within the range of (B3%, B4%] of the preset value for normal startup of the elevated oil tank, the valve position setting of the regulating valve is gradually reduced to C4% in gradient; When the liquid level of the elevated oil tank is greater than the range of (B4%, 1] of the preset value for normal startup of the elevated oil tank, the valve position setting of the regulating valve is set to 0%; If the liquid level of the elevated oil tank reaches the preset value for normal startup of the elevated oil tank and the state feedback of the regulating valve is closed, the elevated oil tank is put into use; Wherein, B1 < B2 < B3 < B4, C1 < C2 < C3, C4 < C3.

8. The one-key hot standby control method for a natural gas long-distance pipeline compressor according to claim 2, wherein: During the establishment of the pressure relief and hot standby mode, the one-key hot standby control method for the natural gas long-distance pipeline compressor further includes a pressure relief and hot standby mode process monitoring step, and the specific steps of the pressure relief and hot standby mode process monitoring are as follows: S100, monitoring the commissioning mode of the instrument air system; The specific method for monitoring the commissioning mode of the instrument air system is that when the commissioning mode of the instrument air system is activated, if the full-open feedback of the instrument air inlet electric valve of the dry gas seal disc or the instrument air inlet electric valve of the motor purge pipeline is not detected within the preset time period, or if the full-open feedback of the instrument air inlet electric valve of the dry gas seal disc is detected and the compressor isolation gas pressure does not reach the normal preset value within the preset time period, the commissioning mode of the instrument air system fails; S200, monitoring the pre-test mode of the lubricating oil pump; The specific method for monitoring the pre-test mode of the lubricating oil pump is to shield the failure signal of the commissioning mode of the instrument air system. When the pre-test mode of the lubricating oil pump is activated, if the state feedback stop of the main lubricating oil pump or the standby lubricating oil pump is not detected within the preset time period, the pre-test mode of the lubricating oil pump fails; S300, monitoring the commissioning mode of the smoke exhaust fan; The specific method for monitoring the commissioning mode of the smoke exhaust fan is to shield the failure signal of the pre-test mode of the lubricating oil pump. When the commissioning mode of the smoke exhaust fan is activated, if the state feedback operation of the smoke exhaust fan of the lubricating oil tank is not detected within the preset time period, the commissioning mode of the smoke exhaust fan fails; S400, monitoring the commissioning mode of the lubricating oil tank heater; The specific method for monitoring the commissioning mode of the lubricating oil tank heater is to shield the failure signal of the commissioning mode of the smoke exhaust fan. When the commissioning mode of the lubricating oil tank heater is activated, if the state feedback operation of the lubricating oil tank heater is not detected within the preset time period, or if the temperature of the lubricating oil tank is not higher than the preset value for low alarm of the tank temperature within the preset time period, the commissioning mode of the lubricating oil tank heater fails; S500, monitoring the test mode of the lubricating oil pump; The specific method for monitoring the test mode of the lubricating oil pump is to shield the failure signal of the commissioning mode of the lubricating oil tank heater. When the test mode of the lubricating oil pump is activated, if the state feedback operation of the lubricating oil test pump is not detected within the preset time period, the test mode of the lubricating oil pump fails; Or if the state feedback operation of the lubricating oil test pump is detected and the lubricating oil main pipe pressure does not reach the normal startup main pipe pressure preset value within the preset time period, the test mode of the lubricating oil pump fails; S600, monitoring the commissioning mode of the lubricating oil pump; The specific method for monitoring the lubricating oil pump commissioning mode is to shield the lubricating oil pump test mode failure signal. After the lubricating oil pump commissioning mode is activated, if the status feedback stop of the lubricating oil test pump is not detected within the preset time period, or if the status feedback stop of the lubricating oil test pump is detected and the status feedback operation of the lubricating oil running pump is not detected within the preset time period, or if the status feedback operation of the lubricating oil running pump is detected and the lubricating oil main pipe pressure does not reach the normal start-up main pipe pressure preset value within the preset time period, then the lubricating oil pump commissioning mode fails; S700, monitoring the overhead tank commissioning mode; The specific method for monitoring the overhead tank commissioning mode is to shield the lubricating oil pump commissioning mode failure signal. After the overhead tank commissioning mode is activated, if the status feedback of the motor positive pressure ventilation leakage compensation mode is not detected within the preset time period, or if the overhead tank liquid level does not reach the normal start-up preset value of the overhead tank liquid level within the preset time period, then the overhead tank commissioning mode fails; S800, monitoring the pressure relief hot standby mode; The specific method for monitoring the pressure relief hot standby mode is that if at least one of the instrument air system commissioning mode, lubricating oil pump pre-test mode, smoke exhaust fan commissioning mode, lubricating oil tank heater commissioning mode, lubricating oil pump test mode, lubricating oil pump commissioning mode, and overhead tank commissioning mode fails, then the activation of the pressure relief hot standby mode fails; record the specific failure time and failure reason after the activation of the pressure relief hot standby mode fails.

9. The one-key hot standby control method for the compressor of the long-distance natural gas pipeline according to claim 8, wherein: During the establishment of the pressure maintenance hot standby mode, the one-key hot standby control method for the natural gas long-distance pipeline compressor further includes the steps of monitoring the pressure maintenance hot standby mode process, and the steps of monitoring the pressure maintenance hot standby mode process include the above S100 to S700, and after S700, it further includes, S900, monitoring the dry gas seal system commissioning mode; The specific method for monitoring the dry gas seal system commissioning mode is to shield the overhead tank commissioning mode failure signal. After the dry gas seal system commissioning mode is activated, if the pneumatic valve at the dry gas seal inlet is not detected to be fully open in the preset time period, then the dry gas seal system commissioning mode fails; S1000, monitoring the compressor pipeline purging mode; The specific method for monitoring the compressor pipeline purging mode is to shield the dry gas seal system commissioning mode failure signal. After the compressor pipeline purging mode is activated, if the compressor vent valve is not detected to be fully open in the preset time period, or if the compressor inlet loading valve is not detected to be fully open in the preset time period, then the compressor pipeline purging mode fails; S1100, monitoring the compressor pipeline pressure equalization mode; The specific method for monitoring the compressor pipeline pressure equalization mode is to shield the compressor pipeline purging mode failure signal. After the compressor pipeline pressure equalization mode is activated, if the compressor vent valve is not detected to be fully closed in the preset time period, or if the differential pressure between the front and back of the compressor inlet loading valve is not detected to be lower than the low differential pressure alarm preset value in the preset time period, then the compressor pipeline pressure equalization mode fails; S1200, monitoring the pressure maintenance hot standby mode; The specific method for monitoring the pressure-maintaining hot standby mode is as follows. If at least one of the following modes fails: the instrument air system operation mode, the lubricating oil pump pre-test mode, the smoke exhaust fan operation mode, the lubricating oil tank heater operation mode, the lubricating oil pump test mode, the lubricating oil pump operation mode, the elevated oil tank operation mode, the dry gas seal system operation mode, the compressor pipeline purging mode, and the compressor pipeline pressure equalization mode, then the activation of the pressure-maintaining hot standby mode fails. After the activation of the pressure-maintaining hot standby mode fails, the specific failure time and the cause of failure are recorded.

10. A one-key hot standby control device for a compressor in a long-distance natural gas pipeline, characterized in that: It includes a memory and a processor. When the computer program stored in the memory is executed by the processor, it realizes the one-key hot standby control method for the compressor of the long-distance natural gas pipeline as described in any one of claims 1 to 9.

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