Steam-electricity double-drive multi-shaft compressor unit connected through double clutches and control method of steam-electricity double-drive multi-shaft compressor unit

Abstract

The invention relates to a multi-shaft compressor unit and a control method thereof, in particular to a steam-electricity double-drive multi-shaft compressor unit connected with double clutches and a control method of the steam-electricity double-drive multi-shaft compressor unit. The technical problems that in the prior art, a pure electricity mode, a pure steam mode and a steam-electricity double-drive mode cannot be switched on line, and when steam is sufficient, a motor cannot be disengaged, so that energy is wasted are solved. The system comprises a multi-shaft compressor, a steam turbine, a motor, a first clutch, a second clutch, a steam flow sensor, a controller and a rotating speed sensor. The multi-shaft compressor comprises a driving shaft; the driving shaft is provided with two driving ends which are respectively a first driving end and a second driving end; the output shaft of the steam turbine is coaxially connected with the first driving end through a first clutch; an output shaft of the motor is coaxially connected with the second driving end through the second clutch; and rotating speed sensors are arranged on the first driving end, the second driving end, the steam turbine and the output shaft of the motor.

Description

Technical Field

[0001] This invention relates to a multi-shaft compressor unit and its control method, specifically to a dual-clutch connected, steam-electric dual-drive multi-shaft compressor unit and its control method. Background Technology

[0002] Multi-shaft compressors are widely used in industries such as petrochemicals, energy and power, and metallurgy due to their advantages such as high pressure ratio, high efficiency, and compact structure. Current technologies primarily employ a single drive method to drive multi-shaft compressors: either electric motor drive or steam turbine drive. Electric motor drive relies on a power supply and offers stable operation, but it has higher energy costs. Steam turbine drive can utilize by-product steam or waste heat from the process, enabling on-site energy use, but it lacks adjustment flexibility. Both of these methods involve a fixed connection between the drive source and the drive shaft of the multi-shaft compressor, making it impossible to flexibly switch drive modes based on energy supply conditions.

[0003] To balance the stability of power supply with the efficient utilization of steam energy, a dual-drive steam-electric system has emerged. This system typically incorporates a clutch between the turbine and the motor, forming a single-shaft series configuration of "turbine, clutch, motor, and compressor." This allows for motor-driven operation when steam is insufficient, and turbine-driven or both when steam is restored. However, this single-clutch, single-side drive architecture has inherent limitations: firstly, its operating modes are essentially limited to "pure electric drive" and "combined steam-electric drive," failing to achieve a "pure steam drive" mode; secondly, when steam is abundant and the turbine is sufficient to independently drive the load, the motor and compressor, being coaxially connected, must idle, generating additional wind friction losses and causing unnecessary energy waste.

[0004] To address the aforementioned issues of multiple energy switching and waste, some existing technologies have made certain improvements. For example, Chinese patent CN110344889A discloses a coaxial unit for a dry quenching coke oven, consisting of a circulating fan and a steam turbine generator. This unit connects a steam turbine, an electric generator that functions as both a motor and a generator, and the circulating fan in series on the same shaft, with a clutch between the turbine and the generator. The core idea is to reduce the two energy switching steps of "steam, power generation, and electric power generation." The clutch allows steam power to directly drive the load when conditions permit, while surplus power is used for power generation, thereby improving the overall energy efficiency of the system.

[0005] However, this solution still has the following drawbacks:

[0006] First, its layout of "steam turbine, clutch, electric generator, and load" is essentially still a single power source series design. The electric generator is located in the middle of the power transmission path, serving as both an energy converter and a power transmission link. This means that in steam-driven mode, the electric generator rotor cannot be completely decoupled from the load, and the problem of idling losses is not fundamentally solved.

[0007] Secondly, this scheme controls the connection and disconnection of the turbine side through only one clutch. The operating logic focuses on the "direct utilization" and "switching compensation" of energy, rather than the independent and flexible scheduling and combination of the two heterogeneous power sources of steam and electricity. Therefore, it cannot achieve online and smooth switching between the three working modes of "pure electric drive", "pure steam drive" and "steam and electric dual drive". Summary of the Invention

[0008] The purpose of this invention is to solve the technical problems of existing technologies being unable to switch between three working modes: pure electric, pure steam, and steam-electric dual drive, as well as the energy waste caused by the inability of the motor to disengage when steam is sufficient. The invention provides a dual-clutch connected steam-electric dual drive multi-shaft compressor unit and its control method.

[0009] To achieve the above objectives, the technical solution provided by this invention is as follows:

[0010] A dual-clutch connected steam-electric dual-drive multi-shaft compressor unit includes a multi-shaft compressor and a steam turbine and an electric motor for driving the multi-shaft compressor; its special feature is that it also includes a first clutch, a second clutch and a controller;

[0011] The multi-shaft compressor includes a drive shaft; the drive shaft has two drive ends, namely a first drive end and a second drive end located on both sides of the multi-shaft compressor.

[0012] The steam turbine is equipped with a steam flow sensor; the output shaft of the steam turbine is coaxially connected to the driving end of the first clutch, and the driven end of the first clutch is coaxially connected to the first driving end.

[0013] The output shaft of the motor is coaxially connected to the driving end of the second clutch, and the driven end of the second clutch is coaxially connected to the second driving end.

[0014] Speed ​​sensors are provided on the first drive end, the second drive end, the output shaft of the steam turbine, and the output shaft of the motor.

[0015] The input terminal of the controller is electrically connected to the output terminals of the steam flow sensor and the speed sensor, respectively, and its output terminal is electrically connected to the control terminals of the steam turbine, the motor, the first clutch, and the second clutch, respectively. It is used to control the engagement and disengagement of the first clutch and the second clutch, as well as the start and stop of the steam turbine and the motor, based on the steam flow value L and speed data collected by the steam flow sensor and the speed sensor, so as to realize the switching of the drive mode of the multi-shaft compressor by the steam turbine and the motor.

[0016] Furthermore, the speed sensor includes a first speed sensor, a second speed sensor, a third speed sensor, and a fourth speed sensor;

[0017] The first speed sensor is mounted on the first drive end, and its output end is electrically connected to the first input end of the controller. It is used to collect the speed data of the first drive end and transmit it to the controller.

[0018] The second speed sensor is mounted on the second drive end, and its output end is electrically connected to the second input end of the controller. It is used to collect the speed data of the second drive end and transmit it to the controller.

[0019] The third speed sensor is installed on the output shaft of the steam turbine, and its output end is electrically connected to the third input end of the controller. It is used to collect the speed data of the steam turbine and transmit it to the controller.

[0020] The fourth speed sensor is mounted on the output shaft of the motor, and its output end is electrically connected to the fourth input end of the controller. It is used to collect the speed data of the motor and transmit it to the controller.

[0021] Furthermore, the first clutch is a speed-adjustable clutch;

[0022] The second clutch is a synchronous clutch.

[0023] Furthermore, the output shaft of the steam turbine is coaxially connected to the driving end of the first clutch, the driven end of the first clutch is connected to the first driving end, the output shaft of the motor is connected to the driving end of the second clutch, and the driven end of the second clutch is connected to the second driving end via couplings.

[0024] Meanwhile, the present invention also provides a control method for a dual-clutch connected gas-electric dual-drive multi-shaft compressor unit, which is characterized by including the following steps:

[0025] S1. Assemble the above-mentioned dual-clutch connected gas-electric dual-drive multi-shaft compressor unit;

[0026] S2, Parameter Preset

[0027] In the controller, a first flow threshold L1 and a second flow threshold L2 are set for the steam turbine inlet flow rate, where L1 is the lower limit of the inlet flow rate required to switch to the steam-electric dual drive mode, L2 is the lower limit of the inlet flow rate required to switch to the pure steam drive mode, and L2 > L1;

[0028] S3, Start and enter pure electric drive mode

[0029] S3.1 Disengage the first clutch and engage the second clutch;

[0030] S3.2 Start the motor and enter the pure electric drive mode. The motor drives the dual-clutch connected gas-electric dual-drive multi-shaft compressor unit to start and make it reach the set working conditions.

[0031] S3.3. The steam flow rate L of the turbine is collected in real time by the steam flow sensor, and the rotational speed data of the first drive end, the second drive end, the output shaft of the turbine and the output shaft of the motor are collected in real time by the speed sensor.

[0032] S4. Switch the pure electric drive mode to the current drive mode.

[0033] S4.1 When the dual-clutch connected steam-electric dual-drive multi-shaft compressor unit is working in pure electric drive mode, the controller compares the real-time collected steam flow value L with the first flow threshold L1 and the second flow threshold L2 to determine whether it is necessary to switch the drive mode. If L1≤L<L2 or L≥L2, it is determined that the drive mode needs to be switched, and then step S4.2 is executed; if L<L1, it is determined that the drive mode does not need to be switched, and then step S4.3 is executed.

[0034] S4.2 Start the turbine and control the engagement of the first clutch, or the engagement of the first clutch and the disengagement of the second clutch, to switch from pure electric drive mode to dual-drive mode or pure steam drive mode, and regard the switched drive mode as the current drive mode, so that the motors that do not need to participate in the drive stop, and then execute step S5; when controlling the engagement of the first clutch, the speed data of the first drive end, the second drive end, the output shaft of the turbine and the output shaft of the motor need to be collected in real time according to the speed sensor in step 3.3;

[0035] S4.3. Set the pure electric drive mode as the current drive mode, and then execute step S5;

[0036] S5, Real-time switching of the current drive mode

[0037] S5.1 When the dual-clutch connected steam-electric dual-drive multi-shaft compressor unit is working in the current drive mode, the controller compares the real-time collected steam flow value L with the first flow threshold L1 and the second flow threshold L2 to determine whether it is necessary to switch the current drive mode. If yes, then execute step S5.2. If no, then maintain the current drive mode until the dual-clutch connected steam-electric dual-drive multi-shaft compressor unit stops, thus completing the control of the dual-clutch connected steam-electric dual-drive multi-shaft compressor unit.

[0038] S5.2 Control the engagement and disengagement of the first clutch and the second clutch, as well as the start and stop of the turbine and the motor, to switch the current drive mode, and then return to step S5.1; When controlling the engagement of the first clutch and the second clutch, the speed data of the first drive end, the second drive end, the output shaft of the turbine and the output shaft of the motor need to be collected in real time according to the speed sensor in S3.3.

[0039] Furthermore, step S4.2 specifically includes:

[0040] If L1≤L<L2, start the steam turbine, control the speed of the steam turbine to synchronize with the speed of the motor, then control the first clutch to engage, realize the switch from pure electric drive mode to steam-electric dual drive mode, and regard the converted drive mode as the current drive mode, and then execute step S5.

[0041] If L≥L2, the turbine is started, and its speed is controlled so that its output power meets the load requirements of the multi-shaft compressor. Then, the speed of the motor is controlled to synchronize with the speed of the turbine. Subsequently, the first clutch is engaged, and then the second clutch is disengaged to achieve the switch from pure electric drive mode to pure steam drive mode. The converted drive mode is regarded as the current drive mode, and the motors that do not need to participate in the drive are stopped. Then, step S5 is executed.

[0042] Furthermore, in step S5, where the current driving mode is pure electric driving mode, the specific steps for real-time switching are as follows:

[0043] S5.1 When the dual-clutch connected steam-electric dual-drive multi-shaft compressor unit is operating in pure electric drive mode, the controller compares the real-time collected steam flow value L with the first flow threshold L1 and the second flow threshold L2 to determine whether it is necessary to switch the current drive mode. If L1≤L<L2, or L≥L2, it is determined that the drive mode needs to be switched, and then step S5.2 is executed; if L<L1, the current drive mode is maintained until the dual-clutch connected steam-electric dual-drive multi-shaft compressor unit stops, thus completing the control of the dual-clutch connected steam-electric dual-drive multi-shaft compressor unit.

[0044] S5.2 If L1≤L<L2, start the steam turbine and control the speed of the steam turbine to be synchronized with the speed of the motor. Then control the first clutch to engage to switch from pure electric drive mode to steam-electric dual drive mode, and then return to step S5.1.

[0045] If L≥L2, the turbine is started, and the turbine speed and torque are controlled to meet the load requirements of the multi-shaft compressor. At the same time, the motor speed is controlled to synchronize with the turbine speed. Then, the first clutch is controlled to engage, and then the second clutch is controlled to disengage, realizing the switch from pure electric drive mode to pure steam drive mode, stopping the motor that does not need to participate in the drive, and then returning to step S5.1.

[0046] Furthermore, in step S5, where the current drive mode is a dual-drive (vehicle-electric) mode, the specific steps for real-time switching are as follows:

[0047] S5.1 When the dual-clutch connected dual-drive multi-shaft compressor unit is working in the dual-drive mode, the controller compares the real-time collected steam flow rate L with the first flow threshold L1 and the second flow threshold L2 to determine whether it is necessary to switch the current drive mode. If L < L1 or L ≥ L2, it is determined that the drive mode needs to be switched, and then step S5.2 is executed; if L1 ≤ L < L2, the current drive mode is maintained until the dual-clutch connected dual-drive multi-shaft compressor unit stops, thus completing the control of the dual-clutch connected dual-drive multi-shaft compressor unit.

[0048] S5.2 If L < L1, then control the first clutch to disengage, realize the switch from steam-electric dual drive mode to pure electric drive mode, stop the steam turbine that does not need to participate in the drive, and then return to step S5.1.

[0049] If L≥L2, the torque and speed of the turbine are controlled to meet the load requirements of the multi-shaft compressor. At the same time, the motor speed is controlled to be synchronized with the turbine speed. Then, the second clutch is controlled to disengage, realizing the switch from the dual-drive mode to the pure-drive mode, so that the motor that does not need to participate in the drive stops, and then the process returns to step S5.1.

[0050] Furthermore, in step S5, where the current driving mode is pure gasoline driving mode, the specific steps for real-time switching are as follows:

[0051] S5.1 When the dual-clutch connected steam-electric dual-drive multi-shaft compressor unit is working in pure steam drive mode, the controller compares the real-time collected steam flow value L with the first flow threshold L1 and the second flow threshold L2 to determine whether it is necessary to switch the current drive mode. If L < L1, or L1 ≤ L < L2, it is determined that the drive mode needs to be switched, and then step S5.2 is executed; if L ≥ L2, the current drive mode is maintained until the dual-clutch connected steam-electric dual-drive multi-shaft compressor unit stops, thus completing the control of the dual-clutch connected steam-electric dual-drive multi-shaft compressor unit.

[0052] S5.2 If L < L1, start the motor and control the motor speed to synchronize with the turbine speed. Then control the second clutch to engage, and then control the first clutch to disengage, so as to switch from pure steam drive mode to pure electric drive mode, so that the turbine that does not need to participate in the drive stops. Then return to step S5.1.

[0053] If L1≤L<L2, then start the motor and control the motor speed to synchronize with the turbine speed. Then control the second clutch to engage to switch from pure steam drive mode to steam-electric dual drive mode, and then return to step S5.1.

[0054] Furthermore, step S5 also includes a fault monitoring and response step:

[0055] If the current drive mode is steam-electric dual drive mode or pure steam drive mode, the controller will detect an abnormality in the steam flow value L collected by the steam flow sensor or an abnormality in the speed data of the first drive end and the output shaft of the turbine collected in real time by the speed sensor based on the data collected by the steam flow sensor and the speed sensor. If the controller detects an abnormality, the controller will determine that the turbine has failed and switch the steam-electric dual drive mode or pure steam drive mode to pure electric drive mode until the turbine failure is resolved. Then, step S5.1 will be executed, or the steam-electric dual drive multi-shaft compressor unit with dual clutch connection will be shut down.

[0056] If the current drive mode is a dual-drive mode or a pure electric drive mode, the controller will detect an abnormality in the real-time speed data of the second drive end and the output shaft of the motor based on the data collected by the speed sensor. If the controller detects an abnormality, it will determine that the motor has failed and switch the current drive mode from the dual-drive mode or the pure electric drive mode to the pure electric drive mode until the motor failure is resolved. Then, it will execute step S5.1, or stop the dual-clutch connected dual-drive multi-shaft compressor unit.

[0057] Compared with the prior art, the present invention has the following beneficial effects:

[0058] 1. This invention discloses a dual-clutch connected steam-electric dual-drive multi-shaft compressor unit. Through the dual-structure arrangement of the first and second clutches, it provides the core hardware foundation for the unit to achieve online flexible switching between three working modes: pure electric, pure steam, and steam-electric dual-drive. It realizes the maximum direct utilization of steam thermal energy, eliminating the multiple energy switching links of "steam, power generation, power transmission, and electric drive", and significantly improving the overall energy efficiency of the system. It is suitable for compression systems in the petrochemical, metallurgical, and energy power fields that have the need for waste heat steam recovery, fundamentally avoiding the energy waste of traditional single-clutch units where the motor still needs to run idle when steam is sufficient.

[0059] 2. The present invention provides a dual-clutch connected gas-electric dual-drive multi-shaft compressor unit. By arranging multiple independent speed sensors at key locations, it can accurately and in real time monitor the speed of each drive shaft, providing the controller with accurate synchronization and load judgment basis, ensuring a smooth and reliable mode switching process, and avoiding mechanical shock.

[0060] 3. This invention discloses a dual-clutch connected steam-electric dual-drive multi-shaft compressor unit. By employing an adjustable-speed clutch as the first clutch, flexible coupling between the turbine speed and the compressor drive end is facilitated. The second clutch employs a synchronous clutch, ensuring rapid and reliable synchronous engagement between the motor and the compressor drive end. The combination of these two clutches optimizes the dynamic performance when different power sources are connected. Simultaneously, each shaft end is coaxially connected via couplings, which not only facilitates installation and alignment but also compensates for certain axial, radial, and angular misalignments, reduces installation accuracy requirements, absorbs some vibration and impact, and extends the service life of the transmission system.

[0061] 4. This invention discloses a control method for a dual-clutch connected steam-electric dual-drive multi-shaft compressor unit. By setting flow and torque safety thresholds and combining real-time data-driven automatic control logic, it achieves intelligent and seamless switching between three drive modes. Simultaneously, through a closed-loop control logic of "threshold preset, data perception, and decision switching," real-time changes in steam conditions are transformed into precise clutch action commands, thereby automatically and intelligently optimizing the matching of operating modes and improving the automation level and energy utilization intelligence of the entire system.

[0062] 5. This invention discloses a control method for a dual-clutch connected gas-electric dual-drive multi-shaft compressor unit. For switching from a pure electric drive mode to other modes, detailed steps, including speed synchronization and torque matching, are designed to ensure a smooth and shock-free switching process. Simultaneously, unnecessary power sources are promptly deactivated, saving energy. Furthermore, for switching from a gas-electric dual-drive mode, a smooth transition mechanism to pure electric or pure gas mode is established. Through clutch disengagement and speed matching control, continuous load operation is ensured without interruption, improving system reliability and continuity. Moreover, for switching from a pure gas drive mode to a pure electric or dual-drive mode, the motor is started and synchronized before the clutch is operated, achieving smooth power source engagement and switching, avoiding the impact of sudden speed changes on the compressor.

[0063] 6. The present invention provides a control method for a dual-clutch connected steam-electric dual-drive multi-shaft compressor unit. By monitoring key parameters in real time and setting a fault response mechanism, it can automatically switch to the standby drive mode when the steam turbine or motor fails, ensuring the continuous operation of the unit and improving the fault tolerance and operational safety of the system. Attached Figure Description

[0064] Figure 1 This is a schematic diagram of an embodiment of a dual-clutch connected gas-electric dual-drive multi-shaft compressor unit according to the present invention;

[0065] Figure 2 This is a schematic diagram illustrating the control principle of an embodiment of a dual-clutch connected, dual-drive, multi-shaft compressor unit according to the present invention.

[0066] The annotations in the attached figures are explained as follows:

[0067] 1-Multi-shaft compressor, 11-Drive shaft, 111-First drive end, 112-Second drive end, 2-Steam turbine, 3-Motor, 4-First clutch, 5-Second clutch, 6-Controller, 7-Speed ​​sensor, 71-First speed sensor, 72-Second speed sensor, 73-Third speed sensor, 74-Fourth speed sensor, 8-Steam flow sensor. Detailed Implementation

[0068] To make the objectives, advantages, and features of the present invention clearer, the following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a further detailed explanation of a dual-clutch connected, dual-drive, multi-shaft compressor unit and its control method. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0069] This invention relates to a dual-clutch connected, dual-drive, multi-shaft compressor unit, such as... Figure 1 , Figure 2As shown, the system includes a first clutch 4, a second clutch 5, a controller 6, a speed sensor 7, a multi-shaft compressor 1, and a steam turbine 2 and a motor 3 for driving the multi-shaft compressor 1. The steam turbine 2 is used to receive and utilize industrial waste heat steam to perform work; the motor 3 is connected to an external power grid.

[0070] The multi-shaft compressor 1 includes a drive shaft 11; the drive shaft 11 has two drive ends, namely a first drive end 111 and a second drive end 112 located on both sides of the multi-shaft compressor 1. In this embodiment, the multi-shaft compressor 1 is a multi-shaft centrifugal compressor.

[0071] The steam turbine 2 is equipped with a steam flow sensor 8 to monitor the steam inlet flow of the steam turbine 2; the output shaft of the steam turbine 2 is coaxially connected to the driving end of the first clutch 4, and the driven end of the first clutch 4 is coaxially connected to the first drive end 111. The first clutch 4 is an adjustable speed clutch, used to achieve flexible connection and power transmission when there is a difference in speed between the steam turbine 2 and the multi-shaft compressor 1.

[0072] The output shaft of motor 3 is coaxially connected to the driving end of the second clutch 5, and the driven end of the second clutch 5 is coaxially connected to the second drive end 112. The second clutch 5 is a synchronous clutch, used to engage or disengage when the speeds of motor 3 and multi-shaft compressor 1 reach synchronization. Speed ​​sensors 7 are provided on the first drive end 111, the second drive end 112, the output shaft of turbine 2, and the output shaft of motor 3.

[0073] The input terminal of the controller 6 is electrically connected to the output terminals of the steam flow sensor 8 and multiple speed sensors 7, respectively. Its output terminal is electrically connected to the control terminals of the steam turbine 2, the motor 3, the first clutch 4, and the second clutch 5, respectively. It is used to control the engagement and disengagement of the first clutch 4 and the second clutch 5 and the start and stop of the steam turbine 2 and the motor 3 according to the steam flow value L and speed data collected by the steam flow sensor 8 and multiple speed sensors 7, so as to realize the switching of the drive mode of the multi-shaft compressor 1 by the steam turbine 2 and the motor 3.

[0074] The speed sensor 7 includes a first speed sensor 71, a second speed sensor 72, a third speed sensor 73, and a fourth speed sensor 74. The first speed sensor 71 is disposed on the first drive end 111, and its output end is electrically connected to the first input end of the controller 6. It is used to collect the speed data of the first drive end 111 and transmit it to the controller 6. The second speed sensor 72 is disposed on the second drive end 112, and its output end is electrically connected to the second input end of the controller 6. It is used to collect the speed data of the second drive end 112 and transmit it to the controller 6. The third speed sensor 73 is disposed on the output shaft of the steam turbine 2, and its output end is electrically connected to the third input end of the controller 6. It is used to collect the speed data of the steam turbine 2 and transmit it to the controller 6. The fourth speed sensor 74 is disposed on the output shaft of the motor 3, and its output end is electrically connected to the fourth input end of the controller 6. It is used to collect the speed data of the motor 3 and transmit it to the controller 6.

[0075] In this embodiment, the output shaft of the steam turbine 2 is coaxially connected to the driving end of the first clutch 4, the driven end of the first clutch 4 is connected to the first driving end 111, the output shaft of the motor 3 is connected to the driving end of the second clutch 5, and the driven end of the second clutch 5 is connected to the second driving end 112 via couplings.

[0076] The control method for the above-mentioned dual-clutch connected dual-drive multi-shaft compressor unit of the present invention includes the following specific steps:

[0077] S1, Parameter Preset

[0078] In the controller 6, the first flow threshold L1 and the second flow threshold L2 of the steam turbine 2 are set, where L1 is the lower limit of the steam flow required to switch to the steam-electric dual drive mode, and L2 is the lower limit of the steam flow required to switch to the pure steam drive mode, and L2 > L1.

[0079] S2. Start and enter pure electric drive mode.

[0080] S2.1 Disengage the first clutch 4 and engage the second clutch 5.

[0081] S2.2 Start motor 3 to enter pure electric drive mode. Motor 3 drives the dual-clutch connected gas-electric dual-drive multi-shaft compressor unit to start and bring it to the set working conditions.

[0082] S2.3 The steam flow rate L of the turbine 2 is collected in real time by the steam flow sensor 8, and the rotational speed data of the first drive end 111, the second drive end 112, the output shaft of the turbine 2 and the output shaft of the motor 3 are collected in real time by the speed sensor 7.

[0083] S3. Switch the pure electric drive mode to the current drive mode.

[0084] S3.1 When the dual-clutch connected steam-electric dual-drive multi-shaft compressor unit is working in pure electric drive mode, the controller 6 compares the real-time collected steam flow value L with the first flow threshold L1 and the second flow threshold L2 to determine whether it is necessary to switch the drive mode. If L1≤L<L2 or L≥L2, it is determined that the drive mode needs to be switched, and then step S3.2 is executed; if L<L1, it is determined that the drive mode does not need to be switched, and then step S3.3 is executed.

[0085] S3.2 Start the turbine 2 and control the engagement of the first clutch 4, or the engagement of the first clutch 4 and the disengagement of the second clutch 5, to switch from pure electric drive mode to dual-drive mode or pure steam drive mode, and regard the switched drive mode as the current drive mode, so that the motor 3, which does not need to participate in the drive, stops, and then execute step S5; when controlling the engagement of the first clutch 4, the speed data of the first drive end 111, the second drive end 112, the output shaft of the turbine 2 and the output shaft of the motor 3 need to be collected in real time by the speed sensor 7 in step S2.3; specifically:

[0086] If L1≤L<L2, start the steam turbine 2, control the speed of the steam turbine 2 to synchronize with the speed of the motor 3, then control the first clutch 4 to engage, realize the switch from pure electric drive mode to steam-electric dual drive mode, and regard the converted drive mode as the current drive mode, and then execute step S4.

[0087] If L≥L2, then start the steam turbine 2, control the speed of the steam turbine 2 so that its output power meets the load requirements of the multi-shaft compressor 1, then control the speed of the motor 3 to synchronize with the speed of the steam turbine 2, then control the first clutch 4 to engage, then control the second clutch 5 to disengage, realize the switch from pure electric drive mode to pure steam drive mode, and regard the converted drive mode as the current drive mode, so that the motor 3, which does not need to participate in the drive, stops, and then execute step S4.

[0088] S3.3. Treat the pure electric drive mode as the current drive mode, and then execute step S4.

[0089] S4. Real-time switching of the current drive mode

[0090] S4.1 When the dual-clutch connected steam-electric dual-drive multi-shaft compressor unit is working in the current drive mode, the controller 6 compares the real-time collected steam flow value L with the first flow threshold L1 and the second flow threshold L2 to determine whether it is necessary to switch the current drive mode. If yes, then step S4.2 is executed; otherwise, the current drive mode is maintained until the dual-clutch connected steam-electric dual-drive multi-shaft compressor unit stops, thus completing the control of the dual-clutch connected steam-electric dual-drive multi-shaft compressor unit.

[0091] S4.2 Control the engagement and disengagement of the first clutch 4 and the second clutch 5, as well as the start and stop of the turbine 2 and the motor 3, to switch the current drive mode, and then return to step S4.1; When controlling the engagement of the first clutch 4 and the second clutch 5, the speed data of the first drive end 111, the second drive end 112, the output shaft of the turbine 2 and the output shaft of the motor 3 need to be collected in real time by the speed sensor 7 in S2.3.

[0092] The current driving mode is pure electric driving mode, and the specific steps for real-time switching are as follows:

[0093] S4.1 When the dual-clutch connected steam-electric dual-drive multi-shaft compressor unit is operating in pure electric drive mode, the controller 6 compares the real-time collected steam flow value L with the first flow threshold L1 and the second flow threshold L2 to determine whether it is necessary to switch the current drive mode. If L1≤L<L2, or L≥L2, it is determined that the drive mode needs to be switched, and then step S4.2 is executed; if L<L1, the current drive mode is maintained until the dual-clutch connected steam-electric dual-drive multi-shaft compressor unit stops, thus completing the control of the dual-clutch connected steam-electric dual-drive multi-shaft compressor unit.

[0094] S4.2 If L1≤L<L2, start the steam turbine 2 and control the speed of the steam turbine 2 to synchronize with the speed of the motor 3. Then control the first clutch 4 to engage to switch from pure electric drive mode to steam-electric dual drive mode, and then return to step S4.1.

[0095] If L≥L2, start the steam turbine 2 and control its speed and torque to meet the load requirements of the multi-shaft compressor 1. At the same time, control the speed of motor 3 to synchronize with the speed of steam turbine 2. Then control the first clutch 4 to engage and the second clutch 5 to disengage, thereby switching from pure electric drive mode to pure steam drive mode. This stops the motor 3, which does not need to participate in the drive. Then return to step S4.1.

[0096] Alternatively, if the current drive mode is a dual-drive (vehicle-electric) mode, the specific steps for real-time switching are as follows:

[0097] S4.1 When the dual-clutch connected dual-drive multi-shaft compressor unit is operating in the dual-drive mode, the controller 6 compares the real-time collected steam flow rate L with the first flow threshold L1 and the second flow threshold L2 to determine whether it is necessary to switch the current drive mode. If L < L1 or L ≥ L2, it is determined that the drive mode needs to be switched, and then step S4.2 is executed; if L1 ≤ L < L2, the current drive mode is maintained until the dual-clutch connected dual-drive multi-shaft compressor unit stops, thus completing the control of the dual-clutch connected dual-drive multi-shaft compressor unit.

[0098] S4.2 If L < L1, then control the first clutch 4 to disengage, realize the switch from steam-electric dual drive mode to pure electric drive mode, stop the steam turbine 2 which does not need to participate in the drive, and then return to step S4.1.

[0099] If L≥L2, the torque and speed of the turbine 2 are controlled to meet the load requirements of the multi-shaft compressor 1. At the same time, the speed of the motor 3 is controlled to synchronize with the speed of the turbine 2. Then, the second clutch 5 is controlled to disengage, realizing the switch from the dual-drive mode of steam and electricity to the pure steam drive mode, so that the motor 3, which does not need to participate in the drive, stops. Then, the process returns to step S4.1.

[0100] Alternatively, where the current drive mode is pure gasoline drive mode, the specific steps for real-time switching are as follows:

[0101] S4.1 When the dual-clutch-connected dual-drive multi-shaft compressor unit is operating in pure steam drive mode, the controller 6 compares the real-time collected steam flow rate L with the first flow rate threshold L1 and the second flow rate threshold L2 to determine whether it is necessary to switch the current drive mode. If L < L1, or L1 ≤ L < L2, it is determined that the drive mode needs to be switched, and then step S4.2 is executed; if L ≥ L2, the current drive mode is maintained until the dual-clutch-connected dual-drive multi-shaft compressor unit stops, thus completing the control of the dual-clutch-connected dual-drive multi-shaft compressor unit.

[0102] S4.2 If L < L1, start motor 3 and control the speed of motor 3 to be synchronized with the speed of turbine 2. Then control the second clutch 5 to engage, and then control the first clutch 4 to disengage, so as to switch from pure steam drive mode to pure electric drive mode, so that turbine 2, which does not need to participate in the drive, stops. Then return to step S4.1.

[0103] If L1≤L<L2, then start motor 3 and control the speed of motor 3 to be synchronized with that of turbine 2. Then control the second clutch 5 to engage, realize the switch from pure steam drive mode to steam-electric dual drive mode, and then return to step S4.1.

[0104] In step S4 of this embodiment, a fault monitoring and response step is also included:

[0105] If the current drive mode is a steam-electric dual drive mode or a pure steam drive mode, the controller 6 will detect an abnormality in the steam flow value L collected by the steam flow sensor 8 or an abnormality in the speed data of the output shaft of the first drive end 111 and the turbine 2 collected by the speed sensor 7 based on the data collected by the steam flow sensor 8 and the speed sensor 7. If the controller 6 detects an abnormality in the steam flow value L collected by the steam flow sensor 8 or the speed data of the output shaft of the turbine 2 collected by the speed sensor 7, it will determine that the turbine 2 has a fault and switch the steam-electric dual drive mode or the pure steam drive mode to the pure electric drive mode until the fault of the turbine 2 is eliminated. Then, step S4.1 will be executed, or the steam-electric dual drive multi-shaft compressor unit with dual clutch connection will be shut down.

[0106] If the current drive mode is a dual-drive mode or a pure electric drive mode, the controller 6 will detect an abnormality in the real-time speed data of the second drive end 112 and the output shaft of the motor 3 collected by the speed sensor 7 based on the data collected by the speed sensor 7. If the speed sensor 7 detects an abnormality, the controller 6 will determine that the motor 3 has failed and will switch the current drive mode from the dual-drive mode or the pure electric drive mode to the pure electric drive mode until the fault of the motor 3 is eliminated. Then, step S4.1 will be executed, or the dual-clutch connected dual-drive multi-shaft compressor unit will be stopped.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention.

Claims

1. A dual-clutch connected steam-electric dual-drive multi-shaft compressor unit, comprising a multi-shaft compressor (1) and a steam turbine (2) and an electric motor (3) for driving the multi-shaft compressor (1); characterized in that: It also includes a first clutch (4), a second clutch (5), and a controller (6); The multi-shaft compressor (1) includes a drive shaft (11); the drive shaft (11) has two drive ends, namely a first drive end (111) and a second drive end (112) located on both sides of the multi-shaft compressor (1). The steam turbine (2) is equipped with a steam flow sensor (8); the output shaft of the steam turbine (2) is coaxially connected to the driving end of the first clutch (4), and the driven end of the first clutch (4) is coaxially connected to the first driving end (111); The output shaft of the motor (3) is coaxially connected to the driving end of the second clutch (5), and the driven end of the second clutch (5) is coaxially connected to the second driving end (112). Speed ​​sensors (7) are provided on the first drive end (111), the second drive end (112), the output shaft of the steam turbine (2) and the output shaft of the motor (3). The input terminal of the controller (6) is electrically connected to the output terminals of the steam flow sensor (8) and the speed sensor (7), respectively. Its output terminal is electrically connected to the control terminals of the steam turbine (2), the motor (3), the first clutch (4) and the second clutch (5), respectively. It is used to control the engagement and disengagement of the first clutch (4) and the second clutch (5), as well as the start and stop of the steam turbine (2) and the motor (3), based on the steam flow value L and speed data collected by the steam flow sensor (8) and the speed sensor (7), so as to realize the switching of the driving mode of the multi-shaft compressor (1) by the steam turbine (2) and the motor (3).

2. The dual-clutch connected gas-electric dual-drive multi-shaft compressor unit according to claim 1, characterized in that: The speed sensor (7) includes a first speed sensor (71), a second speed sensor (72), a third speed sensor (73) and a fourth speed sensor (74). The first speed sensor (71) is disposed on the first drive end (111), and its output end is electrically connected to the first input end of the controller (6) for collecting the speed data of the first drive end (111) and transmitting it to the controller (6). The second speed sensor (72) is disposed on the second drive end (112), and its output end is electrically connected to the second input end of the controller (6) for collecting the speed data of the second drive end (112) and transmitting it to the controller (6). The third speed sensor (73) is installed on the output shaft of the steam turbine (2), and its output end is electrically connected to the third input end of the controller (6) to collect the speed data of the steam turbine (2) and transmit it to the controller (6). The fourth speed sensor (74) is installed on the output shaft of the motor (3), and its output end is electrically connected to the fourth input end of the controller (6) to collect the speed data of the motor (3) and transmit it to the controller (6).

3. The dual-clutch connected gas-electric dual-drive multi-shaft compressor unit according to claim 1 or 2, characterized in that: The first clutch (4) is a speed-adjustable clutch; The second clutch (5) is a synchronous clutch.

4. The dual-clutch connected gas-electric dual-drive multi-shaft compressor unit according to claim 1, characterized in that: The output shaft of the steam turbine (2) is coaxially connected to the driving end of the first clutch (4), the driven end of the first clutch (4) is coaxially connected to the first driving end (111), the output shaft of the motor (3) is coaxially connected to the driving end of the second clutch (5), and the driven end of the second clutch (5) is coaxially connected to the second driving end (112) via couplings.

5. A control method for a dual-clutch connected, dual-drive, multi-shaft compressor unit, characterized in that, Includes the following steps: S1. Assemble the dual-clutch connected gas-electric dual-drive multi-shaft compressor unit as described in any one of claims 1-4; S2, Parameter Preset In the controller (6), a first flow threshold L1 and a second flow threshold L2 are set for the steam inlet flow of the steam turbine (2), wherein L1 is the lower limit of the steam inlet flow required to switch to the steam-electric dual drive mode, and L2 is the lower limit of the steam inlet flow required to switch to the pure steam drive mode, and L2 > L1; S3, Start and enter pure electric drive mode S3.1 Disengage the first clutch (4) and engage the second clutch (5); S3.2 Start the motor (3) and enter the pure electric drive mode. The motor (3) drives the dual-clutch connected gas-electric dual-drive multi-shaft compressor unit to start and make it reach the set working conditions. S3.

3. The steam flow rate L of the turbine (2) is collected in real time by the steam flow sensor (8), and the speed data of the first drive end (111), the second drive end (112), the output shaft of the turbine (2) and the output shaft of the motor (3) are collected in real time by the speed sensor (7). S4. Switch the pure electric drive mode to the current drive mode. S4.1 When the dual-clutch connected steam-electric dual-drive multi-shaft compressor unit is working in pure electric drive mode, the controller (6) compares the real-time collected steam flow value L with the first flow threshold L1 and the second flow threshold L2 to determine whether the drive mode needs to be switched. If L1≤L<L2 or L≥L2, it is determined that the drive mode needs to be switched, and then step S4.2 is executed. If L < L1, then it is determined that there is no need to switch the driving mode, and then step S4.3 is executed; S4.2 Start the turbine (2) and control the engagement of the first clutch (4), or the engagement of the first clutch (4) and the disengagement of the second clutch (5) to achieve the switching from pure electric drive mode to steam-electric dual drive mode or pure steam drive mode, and regard the converted drive mode as the current drive mode, so that the motor (3) that does not need to participate in the drive stops, and then execute step S5; When controlling the engagement of the first clutch (4), the speed data of the first drive end (111), the second drive end (112), the output shaft of the turbine (2) and the output shaft of the motor (3) need to be collected in real time by the speed sensor (7) in step S3.3; S4.

3. Set the pure electric drive mode as the current drive mode, and then execute step S5; S5, Real-time switching of the current drive mode S5.1 When the dual-clutch connected steam-electric dual-drive multi-shaft compressor unit is working in the current drive mode, the controller (6) compares the real-time collected steam flow value L with the first flow threshold L1 and the second flow threshold L2 to determine whether it is necessary to switch the current drive mode. If yes, then step S5.2 is executed. If no, then the current drive mode is maintained until the dual-clutch connected steam-electric dual-drive multi-shaft compressor unit stops, thus completing the control of the dual-clutch connected steam-electric dual-drive multi-shaft compressor unit. S5.2 Control the engagement and disengagement of the first clutch (4) and the second clutch (5), as well as the start and stop of the turbine (2) and the motor (3), to achieve the switching of the current drive mode, and then return to step S5.1; When controlling the engagement of the first clutch (4) and the second clutch (5), the speed data of the first drive end (111), the second drive end (112), the output shaft of the turbine (2) and the output shaft of the motor (3) need to be collected in real time by the speed sensor (7) in S3.

3.

6. The control method for a dual-clutch connected, dual-drive, multi-shaft compressor unit according to claim 5, characterized in that, Step S4.2 specifically includes: If L1≤L<L2, start the steam turbine (2), control the speed of the steam turbine (2) to be synchronized with the speed of the motor (3), then control the first clutch (4) to engage, realize the switch from pure electric drive mode to steam-electric dual drive mode, and regard the converted drive mode as the current drive mode, and then execute step S5. If L≥L2, start the steam turbine (2), control the speed of the steam turbine (2) so that its output power meets the load requirements of the multi-shaft compressor (1), then control the speed of the motor (3) so that it is synchronized with the speed of the steam turbine (2), then control the first clutch (4) to engage, then control the second clutch (5) to disengage, realize the switch from pure electric drive mode to pure steam drive mode, and regard the converted drive mode as the current drive mode, so that the motor (3) that does not need to participate in the drive stops, and then execute step S5.

7. The control method for a dual-clutch connected, dual-drive, multi-shaft compressor unit according to claim 5 or 6, characterized in that: Step S5: The current driving mode is pure electric driving mode. The specific steps for real-time switching are as follows: S5.1 When the dual-clutch connected steam-electric dual-drive multi-shaft compressor unit is working in pure electric drive mode, the controller (6) compares the real-time collected steam flow value L with the first flow threshold L1 and the second flow threshold L2 to determine whether the current drive mode needs to be switched. If L1≤L<L2, or L≥L2, then it is determined that the drive mode needs to be switched, and then step S5.2 is executed. If L < L1, the current drive mode is maintained until the dual-clutch connected electric dual-drive multi-shaft compressor unit stops, thus completing the control of the dual-clutch connected electric dual-drive multi-shaft compressor unit. S5.2 If L1≤L<L2, start the steam turbine (2) and control the speed of the steam turbine (2) to be synchronized with the speed of the motor (3). Then control the first clutch (4) to engage, realize the switch from pure electric drive mode to steam-electric dual drive mode, and then return to step S5.

1. If L≥L2, start the steam turbine (2) and control the speed and torque of the steam turbine (2) to meet the load requirements of the multi-shaft compressor (1). At the same time, control the speed of the motor (3) to synchronize with the speed of the steam turbine (2). Then control the first clutch (4) to engage and then control the second clutch (5) to disengage, so as to switch from pure electric drive mode to pure steam drive mode, so that the motor (3) that does not need to participate in the drive stops, and then return to step S5.

1.

8. The control method for a dual-clutch connected, dual-drive, multi-shaft compressor unit according to claim 5 or 6, characterized in that: Step S5: The current drive mode is dual-drive (vehicle and electric). The specific steps for real-time switching are as follows: S5.1 When the dual-clutch connected dual-drive multi-shaft compressor unit is working in the dual-drive mode, the controller (6) compares the real-time collected steam flow value L with the first flow threshold L1 and the second flow threshold L2 to determine whether the current drive mode needs to be switched. If L < L1 or L ≥ L2, it is determined that the drive mode needs to be switched, and then step S5.2 is executed; if L1 ≤ L < L2, the current drive mode is maintained until the dual-clutch connected dual-drive multi-shaft compressor unit stops, thus completing the control of the dual-clutch connected dual-drive multi-shaft compressor unit. S5.2 If L < L1, then control the first clutch (4) to disengage, realize the switch from steam-electric dual drive mode to pure electric drive mode, stop the steam turbine (2) that does not need to participate in the drive, and then return to step S5.

1. If L≥L2, then control the torque and speed of the turbine (2) to meet the load requirements of the multi-shaft compressor (1), and at the same time control the speed of the motor (3) to synchronize with the speed of the turbine (2), and then control the second clutch (5) to disengage, realize the switch from the dual-drive mode of steam and electricity to the pure steam drive mode, stop the motor (3) that does not need to participate in the drive, and then return to step S5.

1.

9. The control method for a dual-clutch connected, dual-drive, multi-shaft compressor unit according to claim 5 or 6, characterized in that: Step S5: The current driving mode is pure gasoline driving mode. The specific steps for real-time switching are as follows: S5.1 When the dual-clutch connected steam-electric dual-drive multi-shaft compressor unit is working in pure steam drive mode, the controller (6) compares the real-time collected steam flow value L with the first flow threshold L1 and the second flow threshold L2 to determine whether the current drive mode needs to be switched. If L < L1, or L1 ≤ L < L2, it is determined that the drive mode needs to be switched, and then step S5.2 is executed; if L ≥ L2, the current drive mode is maintained until the dual-clutch connected steam-electric dual-drive multi-shaft compressor unit stops, thus completing the control of the dual-clutch connected steam-electric dual-drive multi-shaft compressor unit. S5.2 If L < L1, start the motor (3) and control the speed of the motor (3) to be synchronized with that of the turbine (2). Then control the second clutch (5) to engage, and then control the first clutch (4) to disengage, so as to switch from pure steam drive mode to pure electric drive mode, so that the turbine (2) which does not need to participate in the drive stops, and then return to step S5.

1. If L1≤L<L2, then start the motor (3) and control the speed of the motor (3) to be synchronized with that of the turbine (2). Then control the second clutch (5) to engage, realize the switch from pure steam drive mode to steam-electric dual drive mode, and then return to step S5.

1.

10. The control method for a dual-clutch connected, dual-drive, multi-shaft compressor unit according to claim 5, characterized in that, Step S5 also includes a fault monitoring and response step: If the current drive mode is a steam-electric dual drive mode or a pure steam drive mode, the controller (6) will detect that the steam flow value L collected by the steam flow sensor (8) is abnormal or the speed data of the output shaft of the first drive end (111) and the turbine (2) collected by the speed sensor (7) is abnormal, and then judge that the turbine (2) has a fault. The controller (6) will switch the steam-electric dual drive mode or the pure steam drive mode to the pure electric drive mode until the fault of the turbine (2) is eliminated, and then execute step S5.1, or the steam-electric dual drive multi-shaft compressor unit connected by the dual clutch will be shut down. If the current drive mode is a dual-drive mode or a pure electric drive mode, the controller (6) will detect that the speed data of the output shaft of the second drive end (112) and the motor (3) collected by the speed sensor (7) is abnormal according to the data collected by the speed sensor (7). Then it will determine that the motor (3) has a fault and switch the current drive mode from the dual-drive mode or the pure electric drive mode to the pure electric drive mode until the fault of the motor (3) is eliminated. Then it will execute step S5.1, or the dual-clutch connected dual-drive multi-shaft compressor unit will be stopped.

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