A propylene automatic pressurization skid-mounted system

Abstract

This invention relates to the field of chemical tank technology, specifically a skid-mounted propylene automatic pressurization system. This system achieves efficient pressurization and stable delivery of propylene through the coordinated operation of dual parallel pressurization circuits, a circulating pressure stabilization module, a drive module, and a DCS system. The redundant architecture of the DCS system ensures control stability, while the full lifecycle management system of the circulating pressure stabilization module enhances equipment reliability. The coordinated operation of these modules enables widespread application in the chemical, energy, and other fields, meeting production requirements under diverse operating conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent chemical control, in particular to a propylene automatic pressurization skid-mounted system. Background Art

[0002] A booster pump is a device that provides high-pressure liquid flow and is widely used in industries such as industry, agriculture, and domestic water supply. It increases the pressure of a liquid to achieve higher flow rates and flow rates, thereby meeting the needs of specific work scenarios. Therefore, boosting is an essential part of production and daily life. Traditional booster pumps offer complex operation, cumbersome processes, limited adaptability to specific working conditions, high vibration, poor sealing, low efficiency, and no system protection. Consequently, production urgently requires improved boosting methods, operational procedures, automatic control, system protection, ease of installation and maintenance, safe operation, and the ability to replace equipment without stopping the machine.

[0003] Therefore, the present invention proposes an integrated booster pump skid-mounted system, which integrates two booster pumps (one backup and one use), and drives the impeller in the pump body to rotate through the power source of the electric motor, thereby sucking in the propylene liquid in the tank and transporting it after pressurization. Summary of the Invention

[0004] To achieve the above objectives, the present invention adopts the following technical solutions:

[0005] A propylene automatic pressurization skid-mounted system includes a skid-mounted device and a control system. The skid-mounted device is designed to integrate a machine and pump. The skid-mounted pipeline is installed using standardized prefabrication. The pipeline is arranged in layers within the skid-mounted frame. One end of the pipeline is connected to a drive pump. A control box is designed above the drive pump. A junction box is provided above the control box. Instruments are designed on the pipeline.

[0006] The control system has dual parallel boost circuits, and the dual parallel boost circuits include a working boost circuit and a standby boost circuit. The working boost circuit and the standby boost circuit are completely independently configured and quickly switched through electric valves. During normal operation, only the working boost circuit is put into operation, and the standby boost circuit remains in a hot standby state.

[0007] The control system includes a circulation pressure stabilization module, which is arranged in the working boost circuit and the standby boost circuit to absorb and store excess pressure. The circulation pressure stabilization module monitors the pressure difference between the two circuits in real time. When the pressure difference exceeds the set threshold (±0.05MPa), the flow is dynamically distributed through the regulating valve group to ensure pressure balance.

[0008] The control system includes a drive module, which includes an emergency shut-off interlock module. The drive module adopts a redundant dual-drive pump configuration. Each drive pump is equipped with an independent motor and frequency conversion control system. The dual-drive pumps are connected to the dual-parallel boost circuit and the circulation voltage stabilization module through an intelligent switching system; when the drive pump is started, the circulation voltage stabilization module is pre-charged in advance, and when the drive pump is shut down, the circulation voltage stabilization module automatically switches to bypass mode.

[0009] The control system includes a DCS system, which utilizes a redundant distributed architecture and is equipped with multiple controllers that serve as hot backups. Data and control instructions are synchronized in real time between the controllers via high-speed redundant communication links. The DCS integrates a multi-dimensional sensor monitoring module, dual-parallel boost circuits, and a drive module. The working boost circuit monitors remotely transmitted pressure data in real time. The DCS automatically controls the start and stop of the pump skid based on data fed back by the multi-dimensional sensor monitoring module. If an anomaly occurs in the working boost circuit, the backup boost circuit is activated and connected to the DCS system, enabling non-stop maintenance.

[0010] Furthermore, the dual-parallel booster circuits are equipped with a safety circuit connected to an emergency shutoff interlock module. When the safety circuit is triggered, the driver module prioritizes the emergency shutoff sequence. The safety circuit also includes a backpressure valve with a discharge conduit. The backpressure valve and discharge conduit automatically open based on a set pressure threshold, precisely controlling the rate of pressure release to prevent sudden pressure drops from causing water hammer or equipment shock. The shutoff valves incorporate a built-in displacement-pressure dual feedback mechanism, which transmits valve status to the DCS in real time. Immediately after shutoff, a nitrogen purge is initiated to displace residual media with inert gas, ensuring maintenance safety.

[0011] Furthermore, the emergency shutoff interlock module supports multiple parallel operating modes, including independent operation independent of the DCS system, direct sensor access, and operation determined by software algorithms within the DCS intelligent control module. The independent hardware-independent operation mode utilizes hard-wired components such as relays, pressure switches, and temperature switches to form an independent circuit, enabling operation without DCS power or commands. When field parameters exceed preset thresholds, the pressure / temperature switches directly activate relays, cutting off power to the pump and closing the valve. The direct sensor access mode connects key sensors, such as pressure and vibration sensors, directly to the emergency shutoff interlock module's safety PLC via hardwiring. Data processing utilizes a "two out of three" voting mechanism (activation occurs only when ≥ two of three sensors of the same type are triggered), preventing false operation caused by single-point sensor failure. Sensor signals directly trigger the shutoff command via a dedicated high-speed channel within the safety PLC, bypassing DCS processing. The DCS software algorithm determines the operating mode by collecting multi-dimensional data such as pressure, temperature, flow, and vibration, and then uses fuzzy logic or machine learning algorithms to comprehensively determine whether to trigger the shutoff. It can identify complex fault scenarios such as "normal pressure but sudden drop in flow + abnormal vibration", which is more accurate than a single sensor trigger and can achieve pre-diagnosis and early intervention.

[0012] Furthermore, after the safety circuit is triggered, the emergency shut-off interlock module executes the shut-off procedure according to the three-level instruction: the first-level instruction closes the corresponding boost circuit inlet and outlet, and at the same time triggers the back pressure valve to open the discharge duct; after the second-level instruction cuts off the power supply of the drive pump, the purge pipeline is started to purge the pipeline downstream of the shut-off valve with nitrogen; the third-level instruction keeps the back pressure valve open until the system pressure drops below 0.1 MPa, and then gradually closes the back pressure valve to the set pressure value to maintain a slight positive pressure in the system to prevent air backflow.

[0013] Furthermore, the circulating pressure stabilization module is provided with a buffer to absorb pulse vibrations. The buffer adopts a double-layer pressure vessel nested structure, and the inner layer is configured with an adjustable stiffness airbag group, which consists of a main airbag and multiple auxiliary airbags. The inflation and deflation states of different airbags can be adjusted by the solenoid valve group; the main airbag can respond to low-frequency and large-amplitude pressure fluctuations (such as the impact when the pump starts and stops), absorb energy through large-volume elastic deformation, and reduce the pressure peak. The auxiliary airbag can respond to high-frequency and small-amplitude pulses (such as mechanical vibration when the pump is running), and can be quickly inflated and deflated through the solenoid valve group, and dynamically adjusted to achieve full-band vibration absorption.

[0014] Furthermore, the circulating pressure-stabilizing module is equipped with a high-efficiency buffering and stabilizing module, which is installed in the booster pump skid-mounted pipeline. Its pressure-stabilizing mechanism consists of a multi-stage damping and stabilizing chamber, an adjustable throttle valve group, and a pressure compensation device. The multi-stage damping and stabilizing chamber utilizes a labyrinthine flow channel design, allowing the medium to undergo multiple directional changes within the chamber. This eliminates residual pressure fluctuations by extending the flow path and increasing frictional resistance. The adjustable throttle valve group is equipped with a tuning fork flow sensor and a piezoelectric pressure sensor, creating a dual-parameter feedback control closed loop. The DCS system dynamically adjusts the valve group opening based on flow deviation and pressure gradient. The check valve and shut-off valve are linked to simultaneously block backflow of the medium in the event of an emergency shut-off, working in conjunction with the safety circuit to achieve a complete "shut-off-pressure relief-purge" protection chain.

[0015] Furthermore, the cyclic pressure-stabilizing module includes a full lifecycle management system, which includes fatigue life prediction for the buffer bladder and fault prediction for the high-efficiency buffer and pressure-stabilizing module. This system utilizes a closed-loop mechanism of "data acquisition - model analysis - fault early warning" to monitor the condition and lifespan of the buffer bladder and high-efficiency buffer and pressure-stabilizing module. The buffer bladder fatigue life prediction system uses multi-parameter data acquisition to monitor parameters such as the number of bladder pressure cycles, pressure change rate (ΔP / Δt), temperature fluctuation range, and medium corrosivity (propylene water content and impurity content) in real time. Based on the Paris formula of the fatigue crack growth model, the crack initiation and growth rates of the bladder material under cyclic loading are calculated. The high-efficiency buffer and pressure-stabilizing module fault prediction system monitors multiple parameters, including the pressure differential across the damping plate, throttle valve opening, pressure compensation device response time, and medium flow fluctuations, and uploads these parameters to the DCS system in real time via distributed sensors. Wavelet transform is used to perform time-frequency analysis on vibration signals to extract the characteristic frequencies of damping plate wear. Flow field simulation is used to establish a model for the pressure differential-flow anomaly relationship when the throttle valve is stuck. When the deviation between the monitoring data and the normal operating conditions exceeds the threshold, the system automatically matches the fault feature library, locates the fault type and gives maintenance suggestions.

[0016] Furthermore, the DCS system includes an intelligent control module, which includes a low-load mode, a high-load mode, a fault switching mode, and a pre-cooling / pre-heating mode. The intelligent control module intelligently selects an appropriate boost mode.

[0017] Low-load mode: Only the working boost circuit is enabled, while the standby boost circuit is in "hot standby inspection" mode. The circulating pressure regulator adjusts the buffer airbag pressure to 0.8 MPa to optimize single-circuit pressure stability. The drive pump adopts variable frequency control, and the speed is reduced to 40-60% of the rated value. When the machine stops, it automatically switches to low-load mode, slowly decelerating and shutting down to prevent "dry running" of the pump and damage to the impeller.

[0018] High-load mode: The dual circuits operate in parallel. When the system load rate is greater than 75%, or a single circuit cannot meet the flow demand, the system starts. The DCS system dynamically allocates the flow through the fuzzy PID algorithm. The circulating pressure stabilization module activates the dual-circuit pressure balancing mechanism. By adjusting the opening of the throttle valves of the two circuits, the pump speed is driven to 80-100% of the rated value, and load balancing control is enabled to avoid overloading of a single pump.

[0019] Fault switching mode: When an abnormality is detected in the working boost circuit, it automatically switches to the backup boost circuit. At the same time, the DCS system automatically generates a fault log and locates the problem to the specific component;

[0020] Pre-cooling / preheating mode: Adjust the equipment operating status in advance according to the ambient temperature to prevent startup shock. During the start-up phase, the medium temperature is controlled through the pre-cooling / preheating mode to avoid pipeline vibration caused by startup shock. In low-temperature scenarios, the pipeline electric heating is started, and the buffer airbag is pre-pressurized to 1.0MPa to compensate for the gas volume contraction at low temperatures. The S-curve method is used when starting the pump to avoid startup shock caused by increased medium viscosity at low temperatures. In high-temperature scenarios, the cooling system (water cooling or air cooling) is turned on to control the medium temperature below 45°C. The throttle valve opening is optimized to increase the medium flow rate to prevent high-temperature gasification. The standby boost circuit remains in a "cold standby" state.

[0021] The beneficial effects of this improved technical solution are:

[0022] The deep integration of dual-parallel boosting circuits and the intelligent control of the DCS system breaks the boundaries between hardware equipment and software systems, and deeply integrates the traditionally separated mechanical design, control logic, safety protection and operation and maintenance management to form a full life cycle solution for high-risk media boosting. It is especially suitable for chemical scenarios with continuous production, extreme environments and high safety requirements, and realizes the control strategy of equipment maintenance from "manual experience-dominated" to "data-driven decision-making". This model can become a typical reference for industrial intelligent upgrades.

[0023] The full life cycle management system of the circulation and pressure stabilization module uses predictive technology that integrates data-driven and physical mechanisms to upgrade the maintenance mode of the circulation and pressure stabilization module from "after-the-fact maintenance" to "active prevention", laying the foundation for the intelligent and unmanned operation and maintenance of the propylene boosting skid-mounted system, which is particularly suitable for continuous production scenarios.

[0024] The multi-mode parallel operation of the emergency shut-off interlock module, through the layered design of "hardware guarantee, sensor speed-up, and software intelligence", breaks through the limitations of the "single trigger mode" of traditional safety systems, and provides a safety solution that is both reliable and flexible for the pressurized transportation of high-risk media such as propylene. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a control system diagram of the present invention.

[0026] Figure 2 This is a dual parallel boosting flow chart of the present invention.

[0027] Figure 3 This is a structural diagram of the skid-mounted device of the present invention. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the scope of protection of the present invention.

[0029] A propylene automatic pressurization skid-mounted system includes a skid-mounted device and a control system. This technical solution has the functions of automatically controlling the system pressure, system protection, adjustable pressure, convenient maintenance, good sealing, high installation compatibility, update and upgrade as needed, and non-stop inspection, maintenance, and replacement.

[0030] refer to Figure 3 The skid-mounted unit features an integrated pump and motor design mounted on a removable base frame. The frame structure utilizes a welded Q345B steel frame. The skid-mounted piping utilizes standardized prefabricated installation. Pipeline 1 is arranged in layers within the skid frame, one end connected to a drive pump 11. Above this, a control box 12 houses a built-in PLC controller, inverter, and relay module. A junction box 13, equipped with a surge protector, supports 48 signal inputs. Pipeline connections utilize concave and convex flanges (ASME B16.5 Class 300), with the sealing surfaces welded with carbide.

[0031] The drive pump 11 is a diaphragm metering pump. This pump rotates the impeller within the pump body, drawing in liquid and discharging it under pressure. It is equipped with a diaphragm rupture alarm. A Y-type filter 14 is installed at the inlet end of the drive pump 11. This filter removes impurities, waste, and sediment from the pipeline, protecting valves, instruments, and other components, ensuring the proper functioning of the booster pump system.

[0032] A double-layer pressure buffer 15 is connected to the main outlet channel 1A of the drive pump 11. This buffer absorbs the pulse vibrations of the diaphragm metering pump. When pressure rises rapidly, the airbag inside the buffer 15 absorbs and stores excess pressure. When pressure drops rapidly, the airbag inside the buffer 15 releases the stored pressure, fully absorbing the stroke vibrations of the diaphragm metering pump and ensuring smooth pipeline pressure increase. A pressure gauge on the buffer 15 displays the pressure value of the pipeline system after pressurization in real time, ensuring accurate pressure gauge readings. The buffer 15 consists of a main airbag and an auxiliary airbag, equipped with a pressure sensor.

[0033] Furthermore, the outlet of the drive pump 11 is equipped with a safety circuit 1B, which houses a pilot-operated back-pressure valve 16. Back-pressure valve 16 is set to a pressure value (minimum flow pressure) based on system requirements to prevent excessive system pressure, ensuring that the booster system pressure remains within the required operating range while also protecting the piping system. Back-pressure valve 16 is a key safety feature of this technology. Under normal circumstances, it remains sealed closed. However, in the event of abnormal pressure within the tank, such as during a temperature increase, fire, or operational error, the valve automatically opens and begins to release pressure when the pressure reaches the set pressure of the back-pressure valve. When the pressure drops to the back-pressure valve's reseat pressure, the valve automatically closes, restoring its normal sealing state, thereby ensuring the product's safe use and economic efficiency. When the medium is flammable, explosive, or highly toxic, a conduit is installed at the outlet of the back-pressure valve to direct the discharged medium to a safe location for proper disposal. Direct discharge into the atmosphere is prohibited, ensuring product safety and environmental protection.

[0034] Furthermore, check valves are provided on the main circuit 1A and the safety circuit 1B to allow the medium to pass in one direction only, flowing along the set route, thereby preventing the medium from flowing back and ensuring that the pressure of the pipeline system does not decrease.

[0035] like Figure 2 The dual-parallel boost circuit shown includes a working boost circuit and a standby boost circuit. The working boost circuit and the standby boost circuit are configured with completely independent hardware equipment and instruments, and fast switching is achieved through electric valves. During normal operation, only the working boost circuit is put into operation, and the standby boost circuit remains in a hot standby state.

[0036] like Figure 1 The control system includes a DCS system, which is connected to a multi-dimensional sensor monitoring module, a dual-parallel boost circuit, and a drive module. The working boost circuit monitors remote pressure data in real time. The DCS system automatically controls the start and stop of the pump skid based on the data fed back by the multi-dimensional sensor monitoring module. When the working boost circuit is abnormal, the backup boost circuit is opened and connected to the DCS system to achieve non-stop maintenance. The multi-dimensional sensor monitoring module includes a hardware wiring control channel.

[0037] The DCS system utilizes a redundant distributed architecture with multiple controllers acting as hot standby units. Data and control instructions are synchronized in real time between the controllers via high-speed redundant communication links. The controller hardware utilizes Siemens redundant controllers, and the ET200SP distributed I / O includes 80 AI channels, 40 AO channels, 60 DI channels, and 40 DO channels. The communication network utilizes a redundant Industrial Ethernet ring network with PROFIBUS DDP. The software operating system is Windows Industrial Edition, with redundant deployment. The control software utilizes Siemens PCS7, supporting CFC / SFC programming. The database utilizes the PI System with SQL Server.

[0038] Furthermore, the DCS system includes an intelligent control module, which includes a low-load mode, a high-load mode, a fault switching mode, and a pre-cooling / pre-heating mode. The intelligent control module intelligently selects an appropriate boost mode.

[0039] Low-load mode: Only the active boost circuit is enabled, while the standby boost circuit is in "hot standby inspection" mode. The circulating pressure regulator adjusts the buffer airbag pressure to 0.8 MPa to optimize single-circuit pressure stability. The drive pump adopts variable frequency control, reducing the speed to 40-60% of the rated value. When shutting down, the machine automatically switches to low-load mode, slowly decelerating and shutting down to prevent "dry running" of the pump and damage to the impeller.

[0040] High-load mode: The dual circuits operate in parallel. When the system load rate is greater than 75%, or a single circuit cannot meet the flow demand, the system starts. The DCS system dynamically allocates the flow through the fuzzy PID algorithm. The circulating pressure stabilization module activates the dual-circuit pressure balancing mechanism. By adjusting the opening of the throttle valves of the two circuits, the pump speed is driven to 80-100% of the rated value, and load balancing control is enabled to avoid overloading of a single pump.

[0041] Fault switching mode: When an abnormality is detected in the working boost circuit, it automatically switches to the backup boost circuit. At the same time, the DCS system automatically generates a fault log and locates the problem to the specific component;

[0042] Pre-cooling / preheating mode: Adjust the equipment operating status in advance according to the ambient temperature to prevent startup shock. During the startup phase, the medium temperature is controlled through the pre-cooling / preheating mode to avoid pipeline vibration caused by startup shock. When the temperature is low than 5°C, the pipeline electric heating is started, and the buffer airbag is pre-pressurized to 1.0MPa to compensate for the gas volume contraction at low temperatures. The S-curve method is used when the pump is started to avoid startup shock caused by increased medium viscosity at low temperatures. When the temperature is high than 35°C, the cooling system (water cooling or air cooling) is turned on to control the medium temperature below 45°C. The throttle valve opening is optimized to increase the medium flow rate to prevent high-temperature gasification. The standby boost circuit remains in the "cold standby" state.

[0043] like Figure 1-3 The control system includes a drive module (corresponding to Figure 3 The drive pump 11 and the connected valve instruments in the hardware), the drive module includes an emergency cut-off interlock module, and the drive module adopts a redundant dual-drive pump configuration. Each drive pump is equipped with an independent motor and frequency conversion control system. The dual drive pumps are connected to the dual parallel boost circuit and the circulation pressure stabilization module through an intelligent switching system; when the drive pump is started, the circulation pressure stabilization module is pre-charged in advance, and when the drive pump is stopped, the circulation pressure stabilization module automatically switches to the bypass (i.e., safety circuit) mode.

[0044] Further, such as Figure 1 、 2The dual-parallel booster circuits shown are equipped with a safety circuit connected to the driver module's emergency shutoff interlock. When the safety circuit is triggered, the driver module prioritizes the emergency shutoff sequence. The safety circuit includes a backpressure valve and a shutoff valve, which are connected to the purge line. The backpressure valves are equipped with a discharge conduit. The backpressure valves and discharge conduit automatically open at a set pressure threshold, precisely controlling the pressure release rate to prevent sudden pressure drops from causing water hammer or equipment shock. The shutoff valves feature a built-in displacement-pressure dual feedback mechanism, which transmits valve status to the DCS in real time. A nitrogen purge is initiated immediately after shutoff, replacing any residual media with inert gas to ensure maintenance safety.

[0045] Furthermore, after the safety circuit is triggered, the emergency shut-off interlock module executes the shut-off procedure according to the three-level instruction: the first-level instruction closes the corresponding boost circuit inlet and outlet, and at the same time triggers the back-pressure valve to open the discharge duct. After the second-level instruction cuts off the power supply of the drive pump, the purge pipeline is started to purge the pipeline downstream of the shut-off valve with nitrogen. The third-level instruction keeps the back-pressure valve open until the system pressure drops below 0.1MPa, and then gradually closes the back-pressure valve to the set pressure value to maintain a slight positive pressure in the system to prevent air backflow.

[0046] Furthermore, the emergency shutoff interlock module supports multiple operating modes in parallel, including independent operation independent of the DCS, direct sensor access, and operation determined by software algorithms within the DCS's intelligent control module. The independent hardware-independent operation mode utilizes hard-wired components such as relays, pressure switches, and temperature switches to form an independent circuit. The switches directly drive the relays, eliminating the need for DCS power or commands. When field parameters exceed preset thresholds, the pressure / temperature switches directly activate the relays, shutting off power to the pump and closing the valve. The direct sensor access mode connects key sensors, such as pressure and vibration sensors, directly to the emergency shutoff interlock module's safety PLC via hardwiring. Data processing utilizes a "two out of three" voting mechanism (activation occurs only when ≥ two of three sensors of the same type are triggered), preventing false activation caused by single-point sensor failure. Sensor signals directly trigger the shutoff command via a dedicated high-speed channel within the safety PLC, bypassing DCS processing. The DCS software algorithm determines the operating mode by collecting multi-dimensional data such as pressure, temperature, flow, and vibration, and then uses fuzzy logic or machine learning algorithms to comprehensively determine whether to trigger the shutoff. It can identify complex fault scenarios such as "normal pressure but sudden drop in flow + abnormal vibration", which is more accurate than a single sensor trigger and can achieve pre-diagnosis and early intervention.

[0047] like Figure 1-3 The control system shown includes a cycle voltage stabilization module (corresponding to Figure 3The buffer 15 in the hardware and the connected valve instruments), the circulation pressure stabilization module is set in the pipeline node of the working boost circuit and the standby boost circuit to absorb and store excess pressure. The circulation pressure stabilization module monitors the pressure difference between the two circuits in real time. When the pressure difference exceeds the set threshold (±0.05MPa), the flow is dynamically distributed by adjusting the valve group to ensure pressure balance.

[0048] Furthermore, a buffer 15 is provided in the circulation voltage stabilization module to absorb pulse vibrations. The buffer 15 adopts a double-layer pressure vessel nested structure, and the inner layer is configured with an adjustable stiffness airbag group, which consists of a main airbag and multiple auxiliary airbags. The inflation and deflation states of different airbags can be adjusted through the solenoid valve group; the main airbag can respond to low-frequency and large-amplitude pressure fluctuations (such as the impact when the pump starts and stops), absorb energy through large-volume elastic deformation, and reduce the pressure peak. The auxiliary airbag can respond to high-frequency and small-amplitude pulses (such as mechanical vibration when the pump is running), and can be quickly inflated and deflated through the solenoid valve group, and dynamically adjusted to achieve full-band vibration absorption.

[0049] Furthermore, the circulating pressure-stabilizing module is equipped with a high-efficiency buffering and stabilizing module, installed in the booster pump skid-mounted pipeline. Its stabilizing mechanism consists of a multi-stage damping and stabilizing chamber 17, an adjustable throttle valve group, and a pressure compensation device. The multi-stage damping and stabilizing chamber 17 employs a labyrinthine flow channel design, allowing the medium to undergo multiple directional changes within the chamber. This eliminates residual pressure fluctuations by extending the flow path and increasing frictional resistance. The adjustable throttle valve group is equipped with a tuning fork flow sensor and a piezoelectric pressure sensor, creating a dual-parameter feedback control closed loop. The DCS system dynamically adjusts the valve group opening based on flow deviation and pressure gradient. A check valve is interlocked with a shut-off valve in the pipeline. The shut-off valve is connected to a purge line to simultaneously block backflow of the medium in the event of an emergency shut-off. This, in conjunction with the safety circuit, completes a complete "shut-off-pressure relief-purge" protection chain.

[0050] Further, such as Figure 1The cyclic pressure-stabilizing module shown includes a full lifecycle management system, which includes fatigue life prediction for the buffer bladder and fault prediction for the high-efficiency buffer pressure-stabilizing module. This system utilizes a closed-loop mechanism of "data acquisition - model analysis - fault early warning" to monitor the condition and lifespan of the buffer bladder and high-efficiency buffer pressure-stabilizing module. The buffer bladder fatigue life prediction system uses multi-parameter data acquisition to monitor parameters such as the number of pressure cycles, pressure change rate (ΔP / Δt), temperature fluctuation range, and medium corrosivity (propylene water content and impurity content) in real time. Based on the Paris formula of the fatigue crack growth model, the crack initiation and growth rates of the bladder material under cyclic loading are calculated. The high-efficiency buffer pressure-stabilizing module fault prediction system collects and monitors multiple parameters, including the pressure differential across the damping plate, throttle valve opening, pressure compensation device response time, and medium flow fluctuations. These parameters are then uploaded to the DCS system in real time via distributed sensors. Wavelet transform is used to perform time-frequency analysis on vibration signals to extract the characteristic frequencies of damping plate wear. Flow field simulation is used to establish a model for the pressure differential-flow anomaly relationship when the throttle valve is stuck. When the deviation between the monitoring data and the normal operating conditions exceeds the threshold, the system automatically matches the fault feature library, locates the fault type and gives maintenance suggestions.

[0051] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0052] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above is only a preferred implementation method of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of the present invention.

Claims

1. A propylene automatic pressurization skid-mounted system, comprising a skid-mounted device and a control system, characterized in that: The control system includes a dual-parallel boosting circuit, which includes a working boosting circuit and a standby boosting circuit. The control system includes a circulating pressure stabilizing module, which is arranged in the working boosting circuit and the standby boosting circuit to absorb and store excess pressure. The circulating pressure stabilizing module is provided with a buffer to absorb pulse vibration. The buffer adopts a double-layer pressure vessel nested structure, and the inner layer is configured with an adjustable stiffness airbag group, which consists of a main airbag and multiple auxiliary airbags. The inflation and deflation states of different airbags can be adjusted by an electromagnetic valve group; the circulating pressure stabilizing module is provided with a high-efficiency buffering pressure stabilizing module, which is arranged in the boosting pump skid-mounted pipeline; the high-efficiency buffering pressure stabilizing module is composed of a multi-stage damping pressure stabilizing chamber, an adjustable throttle valve group and a pressure compensation device. The multi-stage damping pressure stabilizing chamber adopts a labyrinth flow channel design. The medium undergoes multiple direction conversions in the chamber, and the residual pressure fluctuations are eliminated by extending the flow path and increasing the friction resistance; the adjustable throttle valve group is equipped with a tuning fork flow sensor and a piezoelectric pressure sensor to construct a dual-parameter feedback control closed loop; The DCS system dynamically adjusts the valve group opening according to flow deviation and pressure gradient; The control system includes a drive module, which includes an emergency cut-off interlock module. The drive module adopts a redundant dual-drive pump configuration. Each drive pump is equipped with an independent motor and frequency conversion control system. The dual-drive pumps are connected to the dual-parallel boost circuit and the circulation voltage stabilization module through an intelligent switching system. When the drive pump is started, the circulation voltage stabilization module is pre-charged in advance. When the drive pump is shut down, the circulation voltage stabilization module automatically switches to bypass mode. The control system includes a DCS system, which is connected to a multi-dimensional sensor monitoring module, a dual-parallel boost circuit, and a drive module. The working boost circuit monitors remote pressure data in real time. The DCS system automatically controls the start and stop of the pump skid based on the data fed back by the multi-dimensional sensor monitoring module. When an abnormality occurs in the working boost circuit, the backup boost circuit is activated and connected to the DCS system to achieve non-stop maintenance. The DCS system includes an intelligent control module, which intelligently selects the appropriate boost mode: Low load mode: only the working boost circuit is enabled; high load mode: dual circuits run in parallel. Fault switching mode: When an abnormality is detected in the working boost circuit, it automatically switches to the backup boost circuit; Pre-cooling / pre-heating mode: Adjust the equipment operating status in advance according to the ambient temperature to prevent startup shock.

2. The propylene automatic pressurization skid-mounted system according to claim 1, characterized in that: The dual parallel boost circuit is equipped with a safety circuit, which is connected to the emergency cut-off interlock module. When the safety circuit is triggered, the drive module preferentially executes the emergency cut-off procedure. The safety circuit includes a back pressure valve, which is provided with a discharge conduit.

3. The propylene automatic pressurization skid-mounted system according to claim 1, characterized in that: The emergency shut-off interlock module has multiple operating modes in parallel, including independent operation without relying on the DCS system, operation with direct access to sensors, and operation determined by the DCS system intelligent control module through software algorithms.

4. The propylene automatic pressurization skid-mounted system according to claim 1, characterized in that: The DCS system adopts a redundant distributed architecture and is equipped with multiple controllers that serve as hot standby for each other. The controllers synchronize data and control instructions in real time through high-speed redundant communication links.

5. The propylene automatic pressurization skid-mounted system according to claim 1, characterized in that: The cyclic voltage stabilization module includes a full life cycle management system, which includes buffer airbag fatigue life prediction and high-efficiency buffer voltage stabilization module fault prediction. The buffer airbag fatigue life prediction is achieved through multi-parameter data collection and calculation of the crack initiation and propagation rate of the airbag material under cyclic load based on the Paris formula of the fatigue crack propagation model.

6. The propylene automatic pressurization skid-mounted system according to claim 2, characterized in that: The emergency shut-off interlock module includes first-level, second-level, and third-level instructions. The first-level instruction closes the corresponding boost circuit inlet and outlet, and simultaneously triggers the back-pressure valve to open the discharge conduit. The second-level instruction cuts off the power supply to the drive pump and starts the purge pipeline to purge nitrogen into the pipeline downstream of the shut-off valve. The third-level instruction keeps the back-pressure valve open until the system pressure drops below 0.1 MPa, and then gradually closes the back-pressure valve to the set pressure value to maintain a slight positive pressure in the system to prevent air backflow.

7. The propylene automatic pressurization skid-mounted system according to claim 1, characterized in that: The skid-mounted device is designed as an integrated machine and pump. The skid-mounted pipeline is prefabricated and installed in a standardized manner. The pipeline is arranged in layers within the skid-mounted frame. One end of the pipeline is connected to the drive pump. A control box is designed above the drive pump. A junction box is provided above the control box. Instruments are designed on the pipeline.

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