Mvr vapor compressor

Abstract

The present application belongs to the technical field of compressor, especially a MVR steam compressor, the present application introduces a detection control system with multi-stage recognition ability on the basis of compressor basic equipment, the system collects steam parameters, mechanical state and process state data in real time through multi-dimensional state sensing module; the running stage recognition module intelligently divides the system running process into start-up initial stage, transition period and stable running period according to the data; the self-adaptive control module calls the corresponding preset strategy set according to the identified different stages, dynamically adjusts the speed and compression ratio of the compressor, for example, low-speed soft start is executed in the start-up initial stage, smooth tracking adjustment is carried out in the transition period, and precise stable control is implemented in the stable running period. The present application realizes adaptive and fine regulation and control of the whole process from start-up to stability, effectively reduces mechanical and electrical impact, improves variable working condition adaptability and running stability, and optimizes overall energy efficiency.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and more particularly to an MVR steam compressor. Background Technology

[0002] MVR steam compressors are core equipment in processes such as evaporation, concentration, and crystallization. They compress and heat secondary steam to restore its heating capacity, thereby achieving heat energy recycling and significantly reducing system energy consumption. In existing technologies (such as Chinese patents CN120926068A and CN120759750A), the control of MVR steam compressors mainly focuses on maintaining parameters under stable operating conditions. For example, by detecting parameters such as steam temperature, pressure, and motor current, the compressor speed or inlet guide vanes are adjusted to maintain stable outlet steam parameters.

[0003] However, similar adaptive control concepts have not been fully applied in MVR systems, especially when dealing with dynamic processes such as system startup, sudden load changes, and process variations. Existing control systems often exhibit lag or abruptness, which can easily lead to the following problems:

[0004] The startup phase is highly impactful: When the system is started up in a cold state, the steam parameters are low. If it is run directly at the rated speed or a high compression ratio, the compressor efficiency will be low and the motor load will increase sharply, which can easily lead to electrical and mechanical shocks and affect the life of the equipment.

[0005] Poor adaptability to changing operating conditions: When the feed concentration, flow rate or evaporation load changes, the amount of steam generated changes accordingly. Traditional control methods respond slowly, which may cause compressor surge, motor overload or large fluctuations in steam parameters, affecting process stability.

[0006] Energy efficiency not optimal: Throughout the entire operating cycle, especially during the transition from startup to stability, the control system failed to make fine adjustments based on real-time conditions, resulting in higher energy consumption at certain times. Overall energy efficiency still has room for improvement.

[0007] Therefore, there is an urgent need for an MVR steam compressor system that can sense the system's operating stage and adaptively adjust the control strategy according to the characteristics of different stages, so as to achieve the goals of smooth start-up, efficient operation, and safe adaptation to changing operating conditions. Summary of the Invention

[0008] Based on the technical problems existing in the prior art, this invention proposes an MVR steam compressor.

[0009] This invention proposes an MVR steam compressor, comprising an evaporation unit, a compression unit, a heat exchange unit, connecting pipelines, and a detection and control system. The compression unit includes a compressor and its drive motor, and the detection and control system includes:

[0010] A multi-dimensional status sensing module is used to collect system operating status data in real time;

[0011] The operation phase identification module has a signal input terminal electrically connected to the multi-dimensional state sensing module, and is used to identify the current operation phase of the system based on the data. The operation phase includes at least the initial startup phase, the transition phase, and the stable operation phase.

[0012] The adaptive control module has its signal input terminal electrically connected to the operation stage identification module, and its control output terminal electrically connected to at least one of the drive motor and the intake regulating device of the compressor. The adaptive control module has a pre-stored set of control strategies corresponding to different operation stages, and dynamically adjusts at least one of the compressor speed and compression ratio by calling the corresponding strategy according to the identified operation stage.

[0013] Preferably, the multi-dimensional state sensing module includes:

[0014] The steam parameter sensors include at least an inlet steam temperature sensor and an inlet steam pressure sensor installed on the steam inlet side of the compressor, and an outlet steam temperature sensor and an outlet steam pressure sensor installed on the steam outlet side of the compressor.

[0015] The mechanical condition sensor includes at least a vibration sensor and a current sensor mounted on the drive motor.

[0016] Preferably, the multi-dimensional state sensing module further includes a process state sensor, which is a level gauge installed in the evaporation unit or an operating time signal generated inside the detection and control system.

[0017] Preferably, the identification logic of the operation phase identification module is as follows:

[0018] The initial start-up determination criteria are: from the start of system startup, at least one of the following conditions must be met: the inlet steam temperature is lower than the first temperature threshold, the inlet steam pressure is lower than the first pressure threshold, and the running time is less than the first time threshold.

[0019] The conditions for determining the stable operation period are: the inlet steam temperature and pressure continuously and stably exceed the second time threshold within their respective target ranges, and the current and vibration values ​​of the drive motor are within the normal range.

[0020] The transition period is the stage in which the initial startup criteria are not met and the stable operation period criteria are not met.

[0021] Preferably, the control strategy pre-stored in the adaptive control module for the initial startup phase includes: controlling the drive motor to start at an initial speed lower than the rated speed and limiting its speed ramp-up rate; and simultaneously controlling the intake regulating device to maintain a small opening.

[0022] Preferably, the control strategy pre-stored in the adaptive control module for the transition period includes: using closed-loop feedback control based on the deviation between the inlet steam parameter and its target value, combined with feedforward compensation based on the rate of change of the inlet steam parameter, to jointly adjust the speed of the drive motor; the opening of the intake regulating device and the speed regulation work in coordination.

[0023] Preferably, in the transition period control strategy, the control parameters of the closed-loop feedback control can be dynamically adjusted according to the duration of the transition period or the degree of proximity of the current steam parameters to the target value.

[0024] Preferably, the control strategy pre-stored in the adaptive control module for the stable operation period includes: precise feedback control with the primary objective of maintaining the temperature and pressure of the compressor outlet steam at at least one of the set values; and continuous monitoring of the inlet steam pressure change trend for preventive adjustment.

[0025] Preferably, the intake regulating device is a regulating valve installed on the compressor outlet pipe, or an adjustable inlet guide vane mechanism built into the compressor, or a combination of the two.

[0026] Compared with the prior art, the present invention provides an MVR steam compressor, which has the following beneficial effects:

[0027] 1. By identifying the initial startup phase and applying a gentle startup strategy, overload and stress impact on the drive motor and compressor mechanical components under cold, low-parameter conditions are effectively avoided, thus extending the service life of the equipment.

[0028] 2. By distinguishing between the transition period and the stable operation period, and by adopting a specially optimized smooth transition strategy for the transition period, the system can reach the new stable point more quickly and smoothly when the load changes and the process is adjusted, thereby reducing the fluctuation range and duration of steam parameters and improving process stability.

[0029] 3. Differentiated control objectives and parameters are adopted for different operating stages, avoiding energy waste during startup and variable operating conditions, enabling the system to operate close to the optimal efficiency point in a wider range of operating conditions, and improving overall energy efficiency.

[0030] 4. Through multi-dimensional state perception and stage recognition, the system can identify abnormal operating conditions (such as difficulty in starting or abnormally prolonged transition) earlier, and can trigger more targeted alarms or protection actions, thereby improving the reliability and security of the system. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the first angle structure of an MVR steam compressor proposed in this invention;

[0032] Figure 2 This is a schematic diagram of the second angle structure of an MVR steam compressor proposed in this invention;

[0033] Figure 3 This is a schematic diagram of the detection and control system of the present invention.

[0034] Figure 4 This is a flowchart of the operation phase identification and strategy switching in the system workflow of the present invention.

[0035] In the diagram: 1. Base; 2. Evaporator; 3. Compressor; 4. Heat exchanger; 5. First pipe; 6. Second pipe; 7. Connecting pipe; 8. Base; 9. Support frame; 10. Drive motor; 11. Regulating valve. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0037] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] Reference Figures 1 to 4 This invention provides an MVR steam compressor.

[0039] I. Equipment Mechanical Structure

[0040] The MVR steam compressor mainly includes an evaporation unit, a compression unit, a heat exchange unit, connecting pipelines, and a support structure, all of which are integrated on a stable base 1.

[0041] Evaporation Unit: The core component is evaporator 2, which is fixedly installed on the left side or front of base 1 (depending on the layout). Evaporator 2 receives the material to be concentrated and uses the heat recovered by the system to evaporate the moisture, generating low-temperature, low-pressure secondary steam. A level gauge is installed on evaporator 2 to monitor the material level, and its signal can serve as an indirect reference for assessing the stability of steam generation.

[0042] Compression Unit: The core is the compressor 3 and its drive motor 10. In this embodiment, the compressor 3 is preferably a multi-stage centrifugal steam compressor with a wide operating condition adjustment range. The compressor 3 is fixedly mounted in the middle of the base 1 via a sturdy base 8. The drive motor 10 is coaxially connected to the compressor 3, providing it with power. A vibration sensor can be installed on the non-drive end of the drive motor 10, and a current sensor can be installed on the power line.

[0043] Heat exchange unit: The core is the heat exchanger 4, which is securely mounted on the right side or rear of the base 1 via a support frame 9. The heat exchanger 4 is usually a shell-and-tube type or a plate type, used to realize the heat exchange between high-temperature and high-pressure steam and the material to be heated (or the circulating material in the system).

[0044] Connecting pipes:

[0045] First pipe 5: Connects the steam outlet of evaporator 2 to the steam inlet of compressor 3, used to deliver low-temperature, low-pressure secondary steam to compressor 3. An inlet steam temperature sensor and an inlet steam pressure sensor are installed on first pipe 5 near the inlet of compressor 3.

[0046] Second pipe 6 connects the steam outlet of compressor 3 to the steam inlet of heat exchanger 4, and is used to transport compressed high-temperature and high-pressure steam to heat exchanger 4. A regulating valve 11 is installed on second pipe 6 (which, along with the adjustable inlet guide vane mechanism of compressor 3, can function independently as an intake regulating device, or the two can be linked), used to regulate steam flow and system pressure. An outlet steam temperature sensor and an outlet steam pressure sensor are installed on second pipe 6 near the inlet of heat exchanger 4.

[0047] Connecting pipe 7: Connects the condensate outlet (or secondary side) of heat exchanger 4 to other parts of the equipment (such as the preheater, the heating chamber of evaporator 2) to complete the recovery of condensate or further utilization of heat.

[0048] Support structure: Base 1 provides a rigid foundation for the entire system; base 8 is used for precise alignment and fixing of compressor 3; support frame 9 is used to support heat exchanger 4, and its height and angle design must ensure smooth pipeline connection and no stress concentration.

[0049] II. Composition of the Detection and Control System

[0050] The core of this equipment's intelligence lies in its detection and control system, which consists of a sensor network (multi-dimensional state sensing modules) and a controller.

[0051] Sensor installation method:

[0052] Steam parameter sensor:

[0053] Inlet steam temperature sensor (e.g., Pt100 RTD): A threaded tube socket is used, inserted vertically or at an angle into the wall of the first pipe 5. The sensing element extends into the central flow field region of the pipe, ensuring that the mainstream steam temperature is measured. The installation position is approximately 3-5 times the pipe diameter from the compressor 3 inlet to avoid the influence of local disturbances.

[0054] Inlet steam pressure sensor (such as a piezoresistive pressure transmitter): A pressure tapping short tube is welded to the top or side of the first pipe 5, with the tapping port perpendicular to the flow direction to avoid erosion. The pressure tapping tube is connected to the sensor using a capillary tube or a direct thread, and proper insulation is provided to prevent condensation from causing measurement errors.

[0055] The outlet steam temperature sensor and outlet steam pressure sensor are installed on the second pipe 6. Their installation method is similar to that of the inlet sensor, but protection against higher temperatures and pressures is required. Generally, higher-grade temperature and pressure sensors are selected. The installation position is after the regulating valve 11 and before the heat exchanger 4 to reflect the final state of the steam entering the heat exchanger.

[0056] Mechanical condition sensors:

[0057] Vibration sensors (such as accelerometers): These are mounted on the horizontal and vertical directions of the bearing housing at the non-drive end of the drive motor 10, using a magnetic base or bolts for fixing, and are used to monitor the intensity of mechanical vibration during the operation of the drive motor 10.

[0058] Current sensor (such as Hall effect current transformer): It is connected to a phase conductor of the main power supply of drive motor 10 and is used to monitor the load current of drive motor 10 in real time.

[0059] Process status sensors:

[0060] Level gauge (such as radar level gauge): Installed on the top of evaporator 2, it continuously measures the material level. The stability or trend of the level can indirectly reflect the stability of steam generation.

[0061] In addition, logic and time signals such as system startup commands and running time are generated and recorded by the controller's internal program, forming a virtual process state perception.

[0062] Controller and its logic (operational phase identification module and adaptive control module):

[0063] The controller can be a high-performance industrial PLC (programmable logic controller) or DCS (distributed control system) controller. Its input module is connected to all the sensor signals mentioned above, and its output module is connected to the frequency converter of the drive motor 10 (for speed regulation) and the actuator of the regulating valve 11 (for opening adjustment).

[0064] The operation phase identification module is built into the controller as a software algorithm. Its identification logic is as follows (the specific threshold needs to be set according to the equipment model and process; this is just an example):

[0065] a. Initial Startup Judgment: Upon receiving the system start command, the controller immediately enters the "Initial Startup" stage. It continuously monitors the inlet steam temperature T_in and pressure P_in. If T_in < 85°C and P_in < 20 kPa (absolute pressure), or the start-up time < 120 seconds, the "Initial Startup" judgment is maintained. If any condition is not met, the system prepares to proceed to the next stage judgment.

[0066] b. Stable Operation Period Determination: After the system is no longer in the "initial startup" stage, the stability conditions are determined. The target inlet temperature T_target is set to 95°C, and the target pressure P_target is set to 30 kPa, with allowable deviations of ±2°C and ±1 kPa, respectively. If, for 300 consecutive seconds, T_in and P_in continuously fall within the target range, and the drive motor current I_motor fluctuates by less than 5% between 80% and 100% of its rated value, with a vibration value below 4.5 mm / s, then the system is determined to have entered the "stable operation period."

[0067] c. Transition Period Determination: From the end of the "Initial Start-up" conditions until the "Stable Operation Period" conditions are met, the system is in a "transition period." Furthermore, during the "Stable Operation Period," if the inlet steam parameters are detected to deviate continuously from the target value by a certain range due to load changes (e.g., T_in changes by more than ±5°C or P_in changes by more than ±3 kPa), and this deviation lasts for more than 30 seconds, the system is determined to have entered a "transition period" caused by load changes, until the stable operation conditions are met again.

[0068] The adaptive control module is also built into the controller in the form of a control algorithm. It calls different control subroutines based on the current stage flag output by the operation stage identification module.

[0069] a. Initial control strategy:

[0070] Speed ​​control: The drive motor 10 is given a low initial speed n_start, for example, 30% of the rated speed (achieved through the frequency converter), and then the speed command is gradually increased at a slow slope (e.g., 5% of the rated speed per minute). Rapid steam heating is not pursued in this stage.

[0071] Pressure / flow control: Keep the regulating valve 11 at a small opening (e.g., 30%) to limit the steam flow into the compressor 3, thereby maintaining a low compression ratio and reducing the load.

[0072] Objective: To allow compressor 3 and drive motor 10 to "warm up" under low load, while waiting for the steam parameters generated by evaporator 2 to rise naturally and slowly.

[0073] b. Transition period control strategy:

[0074] Speed ​​feedforward-feedback composite control: The controller performs PID calculations based on the difference (e_T) between the real-time inlet steam temperature T_in and its target value T_target, outputting a reference speed adjustment. Simultaneously, feedforward compensation is introduced: based on the rate of increase of T_in (dT_in / dt), an additional speed increment proportional to this rate is added to respond in advance to the increase in steam energy, making the speed increase curve more closely match the steam generation curve, achieving smooth catching-up.

[0075] Valve coordinated control: The opening of regulating valve 11 is coordinated with the increase in rotational speed. Initially, as the rotational speed increases, the valve is gradually opened wider (for example, the valve opening increases by 2% for every 5% increase in rotational speed) to gradually improve the system's processing capacity and compression ratio. When the steam parameters approach the target value, the valve control gradually transitions from open-loop coordination to closed-loop PID control with the goal of stabilizing the outlet pressure P_out.

[0076] Parameter Adaptation: In this stage, the parameters of the PID controller (such as the proportional gain Kp) can be set to dynamically adjust as the duration of the "transition period" or the current steam parameters approach the target value. For example, a smaller Kp is used in the early stages of the transition to avoid overshoot; a larger Kp is used when approaching stability to improve regulation accuracy.

[0077] c. Control strategies during stable operation:

[0078] Precise feedback control: The primary control objective is to maintain the outlet steam temperature T_out and / or pressure P_out stable at the process setpoint. An independent, parameter-tuned PID controller is used to finely adjust the speed of the drive motor 10 (fine-tuning) and / or the opening of the regulating valve 11 based on the deviation between the measured values ​​of T_out / P_out and the setpoint.

[0079] Pre-regulation for minor load changes: Continuously monitor the trend of inlet steam pressure P_in. If a slow upward trend of P_in is detected (indicating a possible slight increase in evaporation load), the controller can slightly increase the speed setpoint before the outlet parameters change significantly, thus proactively suppressing disturbances.

[0080] Energy Efficiency Optimization (Optional Advanced Function): During periods of stable operation and constant load, the controller can fine-tune the combination of speed and valve opening, calculate the system's unit compression work or comprehensive energy efficiency index, and find the optimal operating point under the current working conditions through optimization algorithms.

[0081] III. System Workflow and Dynamic Control Process

[0082] With reference to the accompanying diagrams and control logic, describe the complete dynamic process control of the equipment from a cold start-up to stable operation, and then to responding to a load change.

[0083] 1. Cold start and initial start-up control:

[0084] The operator issues the system start command, the controller records the start time, and immediately sets the operation phase flag to "initial start".

[0085] The controller invokes the "initial start control strategy," which sends a command to the drive motor inverter to start the drive motor 10 at 30% of its rated speed (n_start). At the same time, it controls the actuator of the regulating valve 11 to set the valve opening to 30%.

[0086] Evaporator 2 begins to receive feed and be heated (the heat source may come from an external source or the system itself for preheating), gradually generating low-temperature, low-pressure steam. The steam flows to compressor 3 through the first pipe 5. At this time, the T_in and P_in detected by inlet sensors 11 and 12 are very low, meeting the "initial start-up" conditions.

[0087] During this stage, compressor 3 operates at low speed and low flow rate with a very light load. The current and vibration values ​​of drive motor 10 are both low, and the system warms up slowly, avoiding the risk of liquid slugging and excessive stress on the bearings that may be caused by high-speed impact on cold steam.

[0088] 2. Transition period control to stable operation:

[0089] Approximately 90 seconds later, the steam production of evaporator 2 increased, the inlet steam temperature T_in rose to 88°C, and the pressure P_in rose to 22 kPa, exceeding the threshold of "initial start-up" (85°C, 20 kPa). The operation phase identification module switched the flag to "transition period".

[0090] The adaptive control module immediately switches to the "transitional control strategy":

[0091] The speed control loop starts working. Assuming T_target = 95°C, the current T_in = 88°C, and the deviation e_T = 7°C, the PID calculation generates a speed increase. At the same time, the controller calculates that dT_in / dt is approximately 0.05°C / s. Based on this, the feedforward compensation module generates an additional speed increment. The two are combined, causing the drive motor 10 to accelerate from 30% speed with a curve that is more aggressive than a simple PID response but more realistic than a fixed slope.

[0092] Valve control is coordinated with rotational speed. Following preset rules, the controller gradually opens the valve from 30% to 50%, 70%, and so on, as the rotational speed increases. As the compression ratio gradually increases, the outlet steam temperature T_out and pressure P_out begin to rise significantly.

[0093] Throughout the transition period, the controller continuously monitors all sensor data. Data from vibration and current sensors is used for safety monitoring, ensuring the acceleration process remains within mechanical and electrical safety limits. The level gauge signal is used to confirm stable evaporation conditions.

[0094] 3. Stable operation period control:

[0095] About 8 minutes after startup, the inlet steam temperature T_in stabilized between 94-96°C, the pressure P_in stabilized between 29-31kPa and lasted for more than 5 minutes, the drive motor 10 current was stable and the vibration was normal. The operation phase identification module's judgment conditions were met, and the flag was switched to "stable operation period".

[0096] When the control strategy is switched to "precise feedback control", the main control objective becomes maintaining the outlet steam temperature T_out at 120°C (set value). The controller finely adjusts the speed of the drive motor 10 (e.g., fluctuating within the range of 98%-102% of the rated speed) based on the measured value of T_out. The regulating valve 11 is mainly used to fine-tune the pressure and maintain the system resistance balance.

[0097] The system then enters a state of efficient and stable continuous operation.

[0098] 4. Dynamic readjustment in response to load changes:

[0099] Suppose that after 2 hours of operation, the feed concentration suddenly increases, causing the boiling point in evaporator 2 to rise. Under the same heating load, the amount of steam produced temporarily decreases, which is manifested as the inlet steam pressure P_in starting to slowly decrease.

[0100] The controller detected that P_in continuously decreased from 30kPa to 27kPa within 1 minute, exceeding the fluctuation range of the stable operation period. The operation phase identification module determined that the system had entered the "transition period" again due to load changes.

[0101] The adaptive control module re-invokes the "transition period strategy," but the initial state is high pressure. The control objective is adjusted to smoothly guide the system from the current (T_in, P_in) point to another stable point that adapts to the new load (which may require new T_target, P_target, or be calculated in real time by an advanced algorithm).

[0102] The controller may first slightly reduce the drive motor speed by 10 rpm and close the valves slightly to accommodate the temporary reduction in steam volume and prevent the compressor from approaching the surge zone. Then, based on adjustments to the evaporation system (such as increasing heating) and the recovery trend of steam parameters, the speed and valves are smoothly adjusted to seek a new stable equilibrium point. Compared to direct, forceful regulation without stage recognition, this process results in less fluctuation and a smoother recovery.

[0103] As can be seen from the detailed description above, this invention achieves intelligent and precise control of the MVR steam compressor system throughout its entire lifecycle dynamic process through careful sensor placement, operational phase identification logic, and a phased adaptive control strategy. It not only solves the problems of start-up shock and fluctuations in operating conditions, but also improves overall energy efficiency through process optimization.

[0104] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An MVR steam compressor, comprising an evaporation unit, a compression unit, a heat exchange unit, connecting pipelines, and a detection and control system, wherein the compression unit comprises a compressor (3) and its drive motor (10), characterized in that, The detection and control system includes: A multi-dimensional status sensing module is used to collect system operating status data in real time; The operation phase identification module has a signal input terminal electrically connected to the multi-dimensional state sensing module, and is used to identify the current operation phase of the system based on the data. The operation phase includes at least the initial startup phase, the transition phase, and the stable operation phase. The adaptive control module has its signal input terminal electrically connected to the operation stage identification module and its control output terminal electrically connected to the intake adjustment device of the drive motor (10) and the compressor (3). The adaptive control module has a pre-stored set of control strategies corresponding to different operation stages and dynamically adjusts the speed and compression ratio of the compressor (3) according to the identified operation stage by calling the corresponding strategy. The identification logic of the operation phase identification module is as follows: The initial start-up determination condition is: from the start of system startup, at least one of the following conditions must be met: the inlet steam temperature is lower than the first temperature threshold, the inlet steam pressure is lower than the first pressure threshold, and the running time is less than the first time threshold. The conditions for determining the stable operation period are: the inlet steam temperature and pressure continuously and stably exceed the second time threshold within their respective target ranges, and the current and vibration values ​​of the drive motor (10) are within the normal range. The transition period is the stage in which the initial start-up determination conditions are not met and the stable operation period determination conditions are not reached. The pre-stored control strategy in the adaptive control module for the initial startup includes: controlling the drive motor (10) to start at an initial speed lower than the rated speed and limiting its speed ramp-up rate; and controlling the intake regulating device to maintain a small opening. The control strategies pre-stored in the adaptive control module for the transition period include: using PID closed-loop feedback control based on the deviation between the inlet steam temperature and its target value, combined with feedforward compensation based on the rate of change of the inlet steam temperature, to jointly adjust the speed of the drive motor (10); the opening of the intake regulating device and the speed regulation work together, specifically: initially, as the speed increases, the valve is gradually and slowly opened to gradually improve the system's processing capacity and compression ratio; when the inlet steam temperature approaches the target value, the valve control gradually transitions from open-loop coordination to closed-loop PID control with the goal of stabilizing the outlet steam pressure; The control strategies pre-stored in the adaptive control module for the stable operation period include: precise feedback control with the main objective of maintaining the temperature and pressure of the outlet steam of the compressor (3) at least one of the set values; and continuous monitoring of the inlet steam pressure change trend for preventive adjustment.

2. The MVR steam compressor according to claim 1, characterized in that, The multi-dimensional state sensing module includes: The steam parameter sensors include at least an inlet steam temperature sensor and an inlet steam pressure sensor installed on the steam inlet side of the compressor (3), and an outlet steam temperature sensor and an outlet steam pressure sensor installed on the steam outlet side of the compressor (3). The mechanical state sensor includes at least a vibration sensor and a current sensor mounted on the drive motor (10).

3. The MVR steam compressor according to claim 2, characterized in that, The multi-dimensional state sensing module also includes a process state sensor, which is either a level gauge installed in the evaporation unit or a running time signal generated inside the detection and control system.

4. An MVR steam compressor according to claim 1, characterized in that, In the transition period control strategy, the control parameters of the closed-loop feedback control can be dynamically adjusted according to the duration of the transition period or the degree of proximity of the current steam parameters to the target value.

5. An MVR steam compressor according to any one of claims 1-4, characterized in that, The intake regulating device is a regulating valve (11) installed on the outlet pipe of the compressor (3), or an adjustable guide vane mechanism at the inlet of the compressor (3), or a combination of the two.

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