An intelligent expander residual pressure power generation system and control method thereof

Abstract

The present invention discloses an intelligent expander residual pressure power generation system and a control method thereof, which relates to the field of residual pressure power generation technology, and can monitor the load information of the expander in real time to obtain the valve adjustment demand value and perform regulation. At the same time, the system monitors the start and stop parameters inside the expander, analyzes the aerodynamic performance evaluation value, and adjusts the impeller speed according to the evaluation result. In addition, the gas leakage data at each key position of the expander is monitored to evaluate the leakage risk and locate the leakage source, and finally the power generation data and operating performance are comprehensively evaluated to form an intelligent control decision. The operating efficiency of the expander is optimized, the energy loss is reduced, and the safety and reliability of the system are improved, thereby effectively improving the overall efficiency of residual pressure power generation.

Description

Technical Field

[0001] The present invention relates to the technical field of excess pressure power generation, and in particular to an intelligent expander excess pressure power generation system and a control method thereof. Background Art

[0002] The residual pressure power generation system is a technology that uses the residual pressure energy of gas or liquid to generate electricity. It is widely used in natural gas, petroleum, chemical and other industrial fields. With the increasing scarcity of resources and the enhancement of environmental protection awareness, residual pressure power generation technology has gradually become an important means to achieve efficient energy utilization and sustainable development. The system can effectively reduce the energy loss of the system and improve the overall operating efficiency by converting the energy of gas flow.

[0003] Prior art, such as the air compressor station surplus work recovery power generation system disclosed in the invention patent with announcement number CN115693798B, includes a data acquisition module, a data analysis module, a fault analysis module and a server; the data acquisition module is used to collect the periodic power value of the air compressor station surplus work and the transmission loss value of the air compressor station surplus work, and the data acquisition module transmits the periodic power value and the transmission loss value to the data analysis module; the data analysis module calculates and processes the periodic power value and the transmission loss value to obtain the air compressor station surplus work recovery power generation effect signal, and transmits the air compressor station surplus work recovery power generation effect signal to the server; the fault analysis module receives the air compressor station surplus work recovery power generation effect signal transmitted by the server, and performs fault processing on the air compressor station with poor air compressor station surplus work recovery power generation effect signal.

[0004] Prior art, such as the invention patent announcement with announcement number CN106230025B, discloses an intelligent energy supply control system and method based on photovoltaic storage and waste heat and waste pressure power generation. Ordinary small-scale waste heat and waste pressure power generation systems are not equipped with a separate control system and cannot achieve integrated management requirements such as management of multiple energy inputs, automatic adjustment of power quality, online power control, and automatic load control. It includes a waste pressure power generation intelligent energy supply management system, a grid-connected module, a waste pressure power generation input control module, and a photovoltaic input control module. The waste pressure power generation input interface is connected to the waste pressure power generation input control module, the photovoltaic power generation input interface is connected to the photovoltaic input control module, the load power output interface is connected to the load power output control module, the power generation system self-use power input interface is connected to the power generation system self-use power control module, and the energy storage system module is connected to the energy storage system control module.

[0005] In combination with the above schemes, it is found that the current excess pressure power generation system and its control method do not fully consider the complex operating environment factors of the start and stop of the unit and the parameter changes of the expander, which may lead to the expander being unable to effectively convert the excess pressure into mechanical energy and the instability or energy waste of the expander operation process, making it difficult to achieve the best power generation effect. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides an intelligent expander residual pressure power generation system and a control method thereof, which can effectively solve the problems involved in the above-mentioned background technology.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: an intelligent expander residual pressure power generation system and a control method thereof, including a valve monitoring and control module, which is used to convert the residual pressure gas collected by the expander into mechanical energy, and monitor the load information of the expander in each preset monitoring cycle, process the valve adjustment value of the expander in each monitoring cycle, and monitor and regulate the valve of the expander.

[0008] The speed control module is used to monitor and analyze the start and stop parameters inside the expander, obtain the pneumatic performance evaluation value of the expander in each monitoring cycle, and adjust the speed of the expander impeller according to the pneumatic performance evaluation value of the expander in each monitoring cycle.

[0009] The leakage control module is used to monitor the gas leakage data of each key position of the expander, obtain the leakage risk assessment value of each key position of the expander, and analyze and locate the gas leakage position of the expander and perform regulation based on the leakage risk assessment value of each key position of the expander.

[0010] The power generation monitoring module is used to monitor the power generation data of the expander, conduct a comprehensive evaluation of the operating performance of the expander and obtain the intelligent control results of the expander.

[0011] Furthermore, the valve adjustment value of the expander in each monitoring cycle is obtained by the following specific process: monitoring the load information of the expander in each monitoring cycle, wherein the load information of the expander includes the residual pressure gas flow, flow velocity, pressure at the inlet and the residual pressure gas flow, flow velocity and pressure at the exhaust port, performing difference processing on each of them to obtain the residual pressure gas deviation flow of the expander, the deviation flow velocity of the expander and the pressure difference of the expander, and extracting the flow resistance of the expander, and obtaining the valve adjustment value of the expander in each monitoring cycle after processing, wherein the valve adjustment value of the expander in each monitoring cycle reflects the degree to which the valve of the expander needs to be adjusted.

[0012] Furthermore, the valve of the expander is monitored and regulated, and the specific process is: the valve of the expander is regulated according to the result of comparing the valve regulation value of the expander in each monitoring cycle with the set valve regulation requirement threshold of the expander.

[0013] When the valve adjustment value of the expander in a certain monitoring cycle is a positive value and is higher than or equal to the valve adjustment threshold of the expander, the intake valve of the expander is closed and the exhaust valve is increased in opening; if the valve adjustment value of the expander in a certain monitoring cycle is a negative value and is lower than or equal to the negative number of the valve adjustment threshold of the expander, the exhaust valve of the expander is reduced in opening and the intake valve is gradually increased; if the valve adjustment value of the expander in a certain monitoring cycle is a positive value and is lower than the valve adjustment threshold of the expander or the valve adjustment value of the expander in a certain monitoring cycle is a negative value and higher than the negative number of the valve adjustment threshold of the expander, there is no need to adjust the valve of the expander.

[0014] Furthermore, the start and stop parameters inside the expander are monitored and analyzed to obtain the pneumatic performance evaluation value of the expander in each monitoring cycle. The specific process is: in each monitoring cycle, the start and stop parameters inside the expander are monitored, including the expander air inlet temperature, the exhaust port temperature, and the output power of the expander, the expander air inlet temperature and the exhaust port temperature are divided to obtain the expansion ratio of the expander, and the pressure difference of the expander and the energy conversion efficiency of the expander are extracted, and the pneumatic performance evaluation value of the expander in each monitoring cycle is obtained after processing. The pneumatic performance evaluation value of the expander in each monitoring cycle is used to evaluate the overall energy conversion efficiency of the expander.

[0015] Furthermore, the speed of the expander impeller is adjusted according to the aerodynamic performance evaluation value of the expander in each monitoring cycle. The specific process is: the aerodynamic performance evaluation value of the expander in each monitoring cycle is compared with the aerodynamic performance evaluation threshold stored in the database. If the aerodynamic performance evaluation value of the expander in a certain monitoring cycle is higher than the aerodynamic performance evaluation threshold, the aerodynamic performance evaluation value of the expander in the monitoring cycle is differenced with the aerodynamic performance evaluation threshold to obtain a first difference in the aerodynamic performance evaluation of the expander, and the first difference in the aerodynamic performance evaluation of the expander is matched with the first impeller speed adjustment value corresponding to the first standard deviation of the aerodynamic performance evaluation of the expander in the database in each interval to obtain the first impeller speed adjustment value of the expander, thereby reducing the impeller speed according to the first adjustment value of the impeller speed of the expander.

[0016] If the aerodynamic performance evaluation value of the expander in a certain monitoring period is lower than the aerodynamic performance evaluation threshold, the aerodynamic performance evaluation threshold is subjected to difference processing with the aerodynamic performance evaluation value of the expander in the monitoring period to obtain a second difference in the aerodynamic performance evaluation of the expander, and the second difference in the aerodynamic performance evaluation of the expander is matched with the second adjustment value of the impeller speed corresponding to the second standard deviation of the aerodynamic performance evaluation of the expander in the database in each interval to obtain the second adjustment value of the impeller speed of the expander, thereby increasing the impeller speed according to the second adjustment value of the impeller speed of the expander.

[0017] If the aerodynamic performance evaluation value of the expander in each monitoring cycle is equal to the aerodynamic performance evaluation threshold, the impeller speed of the expander is not adjusted.

[0018] Furthermore, the leakage risk assessment value of each key position of the expander is obtained, and the specific process is: extracting the gas leakage data of each key position of the expander, including natural gas concentration and vibration frequency, and obtaining the leakage risk assessment value of each key position of the expander after processing. The leakage risk assessment value of each key position of the expander is used to determine the severity of gas leakage at each key position of the expander.

[0019] Furthermore, the leakage risk assessment value at each key position of the expander is compared with a preset leakage risk assessment threshold. If the leakage risk assessment value at a key position of the expander is higher than the leakage risk assessment threshold, the key position of the expander is marked as a leakage position, thereby obtaining the leakage positions of the expander, starting emergency ventilation, closing the valve of the expander, and triggering an alarm mechanism to notify the operator.

[0020] Furthermore, the operating performance of the expander is comprehensively evaluated and an intelligent control result of the expander is obtained. The specific process is: extracting the valve adjustment value of the expander in each monitoring cycle, the pneumatic performance evaluation value of the expander in each monitoring cycle, and the leakage risk evaluation value of each key position of the expander, extracting the power generation of the expander in each monitoring cycle, and integrating them to obtain the comprehensive evaluation value of the expander in each monitoring cycle.

[0021] The comprehensive evaluation value of the expander in each monitoring cycle is compared with the preset comprehensive evaluation threshold of the expander, and the number of monitoring cycles in which the comprehensive evaluation value is greater than or equal to the preset comprehensive evaluation threshold is counted, and recorded as the number of qualified operation cycles of the expander; if the number of qualified operation cycles of the expander is higher than or equal to the preset number of qualified standard operation cycles of the expander, the intelligent control result of the expander is set to qualified; if the number of qualified operation cycles of the expander is lower than the preset number of qualified standard operation cycles of the expander, the intelligent control result of the expander is set to unqualified, and the staff is notified to inspect and repair the expander.

[0022] Furthermore, the comprehensive evaluation value of the expander in each monitoring cycle is specifically analyzed under the following conditions:

[0023] ;

[0024] In the formula, represents the comprehensive evaluation value of the i-th expander, represents the leakage risk assessment value of the expander, represents the pneumatic performance evaluation value of the expander in the i-th monitoring cycle, represents the valve adjustment value of the expander in the i-th monitoring cycle, represents the valve adjustment threshold of the expander, represents the power generation of the expander in the i-th monitoring cycle, Indicates the weight factor corresponding to the preset leakage risk assessment value, Indicates the weight factor corresponding to the preset aerodynamic performance evaluation value, Indicates the weight factor corresponding to the preset valve adjustment demand value, represents the weight factor corresponding to the power generation of the preset expander, i represents the number of each monitoring period, , n represents the total number of monitoring cycles.

[0025] The second aspect of the present invention also provides a control method for an intelligent expander residual pressure power generation system, including: converting the residual pressure gas collected by the expander into mechanical energy, and monitoring the load information of the expander in each preset monitoring cycle, processing to obtain the valve adjustment value of the expander in each monitoring cycle, and monitoring and regulating the valve of the expander.

[0026] The start and stop parameters inside the expander are monitored and analyzed to obtain the aerodynamic performance evaluation value of the expander in each monitoring cycle, and the speed of the expander impeller is adjusted according to the aerodynamic performance evaluation value of the expander in each monitoring cycle.

[0027] Monitor the gas leakage data at each key position of the expander to obtain the leakage risk assessment value of each key position of the expander. According to the leakage risk assessment value of each key position of the expander, analyze and locate the gas leakage position of the expander and perform regulation.

[0028] Monitor the power generation data of the expander, conduct a comprehensive evaluation of the operating performance of the expander and obtain the intelligent control results of the expander.

[0029] The present invention has the following beneficial effects:

[0030] (1) The present invention provides an intelligent expander residual pressure power generation system and a control method thereof, which can monitor the load information of the expander in real time to obtain the valve adjustment demand value and perform regulation. At the same time, the system monitors the start and stop parameters inside the expander, analyzes the aerodynamic performance evaluation value, and adjusts the impeller speed according to the evaluation results. In addition, the gas leakage data at each key position of the expander is monitored to evaluate the leakage risk and locate the leakage source. Finally, the power generation data and operating performance are comprehensively evaluated to form an intelligent control decision. The operating efficiency of the expander is optimized, the energy loss is reduced, and the safety and reliability of the system are improved, thereby effectively improving the overall efficiency of residual pressure power generation.

[0031] (2) The present invention helps to ensure the optimal operating state of the expander during the power generation process by deriving the valve adjustment demand value to determine the corresponding valve adjustment strategy, effectively improving the power generation efficiency and system stability, while reducing energy loss and safety risks, and providing reliable support for intelligent control.

[0032] (3) The present invention obtains a control strategy for the impeller speed by analyzing the aerodynamic performance evaluation value of the expander in each monitoring cycle. The impeller speed can be dynamically adjusted according to the real-time aerodynamic performance, thereby optimizing the energy conversion efficiency and improving the power generation effect. At the same time, it helps to ensure the safety and stability of the equipment, make full use of the energy of the residual pressure gas, and improve the accuracy and response speed of the intelligent control.

[0033] (4) The present invention extracts the valve adjustment value of the expander, the pneumatic performance evaluation value of the expander, and the leakage risk evaluation value of the expander, and extracts the power generation of the expander in each monitoring cycle to quickly determine whether there is a gas leak inside or outside the expander and its severity. At the same time, setting multiple monitoring cycles and calculating the comprehensive evaluation value of the expander can timely discover and deal with leakage risks, ensure equipment safety, improve power generation efficiency, and ensure the reliability and effectiveness of intelligent control, and further optimize the residual pressure power generation process.

[0034] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is an overall schematic diagram of the system module of the present invention;

[0036] Figure 2 A schematic diagram of the intelligent expander provided by the present invention;

[0037] Figure 3 A comprehensive evaluation value curve of the expander provided by the present invention;

[0038] Figure 4 It is a schematic diagram of the method flow of the present invention.

[0039] In the figure: 1. expander; 2. gear box; 3. coupling; 4. generator; 5. lubricating oil station. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0042] See also Figure 1 As shown, an embodiment of the present invention provides a technical solution for an intelligent expander residual pressure power generation system.

[0043] An intelligent expander residual pressure power generation system includes a valve monitoring control module, which is used to convert the residual pressure gas collected by the expander into mechanical energy, monitor the load information of the expander in each preset monitoring cycle, process the valve adjustment value of the expander in each monitoring cycle, and monitor and regulate the valve of the expander.

[0044] The speed control module is used to monitor and analyze the start and stop parameters inside the expander, obtain the pneumatic performance evaluation value of the expander in each monitoring cycle, and adjust the speed of the expander impeller according to the pneumatic performance evaluation value of the expander in each monitoring cycle.

[0045] The leakage control module is used to monitor the gas leakage data of each key position of the expander, obtain the leakage risk assessment value of each key position of the expander, and analyze and locate the gas leakage position of the expander and perform regulation based on the leakage risk assessment value of each key position of the expander.

[0046] The power generation monitoring module is used to monitor the power generation data of the expander, conduct a comprehensive evaluation of the operating performance of the expander and obtain the intelligent control results of the expander.

[0047] It should be added that Figure 2 As shown, Figure 2 This is a schematic diagram of the intelligent expander of this embodiment. The intelligent expander waste pressure power generation system is based on the same principle as hydroelectric power generation. The expander 1 converts the pressure energy in the gas into mechanical energy, and then drives the generator 4 to generate electricity through the gear box 2 and the coupling 3. At the same time, the lubricating oil station 5 provides lubricating oil to the expander, gear box and other rotating parts. The expander uses the energy of the pressure difference to use the fluid to drive the impeller; the gear box changes the speed and torque of the expander, and converts the high speed of the expander into a lower speed that the generator can accept; the coupling is used to connect the expander and the generator, and mechanically connects the axes of the two together to transfer mechanical energy; the impeller drives the generator to convert mechanical energy into electrical energy and transmit it. In natural gas waste pressure power generation, water pressure is replaced by gas pressure, the fluid is replaced from water to natural gas, and the turbine generator set is replaced by a turbine expander generator set.

[0048] It should be added that the intelligent expander of this embodiment optimizes the nozzle structure to achieve more flexible speed regulation and more sensitive and accurate control requirements. The impeller outlet end including the diffuser is optimized to optimize the outlet flow field and minimize the impact of the working fluid vortex on the impeller. Accurately calculate the rotor axial thrust, optimize the thrust balance point, and optimize the bearing design. In addition, compared with the rigid shaft used by mainstream manufacturers to transfer kinetic energy, this structure uses a flexible shaft to transfer kinetic energy. This structure can reduce the disturbance effect of the working fluid airflow and vortex on the rotor. It also includes a gear reducer and a gearbox manufacturer jointly designing the structure to improve the transmission accuracy of the reducer. On the turbine expander generator set, a dry gas sealing device is used. This seal has low power consumption and very little leakage of the working medium. It is an environmentally friendly seal that is particularly suitable for natural gas working media and its environment.

[0049] It should be noted that the expansion machine sealing system in this embodiment adopts dry gas sealing, which can achieve zero leakage of natural gas to the outside world and can operate safely and reliably for a long time. In addition, the generator adopts EXdⅡBT4 (ExdⅡBT4 represents that this explosion-proof motor is flameproof, suitable for factory environment, and can operate safely in an environment containing Class IIB, Class I represents mine equipment, Class II represents factory equipment, and flammable gas, and the surface temperature of the motor does not exceed 135 degrees Celsius) grade explosion-proof motor, all sensors are intrinsically safe, and can operate safely in a natural gas environment; at the same time, the residual pressure power generation device is also equipped with a combustible gas detector, when the power generation device leaks natural gas, it will send an alarm signal to prevent safety accidents.

[0050] Specifically, the valve adjustment value of the expander in each monitoring cycle is obtained, and the specific process is: monitoring the load information of the expander in each monitoring cycle, wherein the load information of the expander includes the residual pressure gas flow, flow velocity, pressure at the inlet, and the residual pressure gas flow, flow velocity and pressure at the exhaust port, performing difference processing on each of them to obtain the residual pressure gas deviation flow of the expander, the deviation flow velocity of the expander and the pressure difference of the expander, and extracting the flow resistance of the expander, and obtaining the valve adjustment value of the expander in each monitoring cycle after processing, wherein the valve adjustment value of the expander in each monitoring cycle reflects the degree to which the inlet valve or the exhaust valve needs to be adjusted.

[0051] It should be noted that the load information of the expander represents the average value in the monitoring period, that is, the ratio of the load information at each monitoring time point in the monitoring period to the number of monitoring time points.

[0052] It should be noted that residual pressure gas refers to high-pressure gas that is not fully utilized in the system or equipment during the industrial process or production process, and is usually present in the exhaust or exhaust outlet of pipelines, containers, or other equipment. Residual pressure gases usually still have a certain pressure and energy, even though they are no longer directly used. In residual pressure power generation, these residual pressure gases are recovered through an expander, and the pressure energy is converted into mechanical energy through gas expansion, and then the mechanical energy is converted into electrical energy through a generator. This method can improve energy utilization efficiency, reduce waste and reduce costs.

[0053] It should be noted that, in this embodiment, the residual pressure gas flow rate at the inlet is subtracted from the residual pressure gas flow rate at the exhaust port to obtain the residual pressure gas deviation flow rate of the expander. Similarly, the residual pressure gas flow rate at the inlet is subtracted from the residual pressure gas flow rate at the exhaust port to obtain the residual pressure gas deviation flow rate of the expander, and the pressure difference of the expander is obtained by subtracting the residual pressure gas pressure at the exhaust port from the residual pressure gas pressure at the inlet.

[0054] It should be noted that the residual pressure gas flow rate, flow rate, pressure at the air inlet, and the residual pressure gas flow rate, flow rate and pressure at the exhaust port are monitored respectively by the residual pressure gas flow sensor, flow rate sensor and pressure sensor.

[0055] It should be noted that before analyzing the valve adjustment value of the expander in each monitoring cycle, the residual pressure gas deviation flow rate at the expander inlet, the deviation flow rate of the expander, and the pressure difference of the expander are also de-normalized.

[0056] It should be noted that the specific analysis conditions for the valve adjustment value of the expander in each monitoring cycle are:

[0057] ;

[0058] in, represents the valve adjustment value of the expander in the i-th monitoring cycle, represents the residual pressure gas deviation flow rate at the expander inlet in the i-th monitoring cycle, represents the deviation flow rate of the expander in the i-th monitoring cycle, represents the pressure difference of the expander in the i-th monitoring cycle, represents the flow resistance of the expander in the i-th monitoring cycle, Indicates the weight factor corresponding to the set residual pressure gas deviation flow rate, Indicates the weight factor corresponding to the set residual pressure gas deviation flow rate, Indicates the weight factor corresponding to the set pressure difference of the expander, represents the weight factor corresponding to the set flow resistance of the expander, i represents the number of each monitoring cycle, , n represents the total number of monitoring cycles.

[0059] It should be noted that the flow rate refers to the flow rate of the residual pressure gas at the air inlet, that is, the flow rate before the gas enters the expander. It directly affects the flow and expansion efficiency of the gas in the expander. Pressure refers to the gas pressure at the air inlet, usually the residual pressure, that is, the initial pressure when the high-pressure gas enters the expander, which is the key parameter for the expander to convert the residual pressure into mechanical energy.

[0060] It should be noted that computational fluid dynamics simulation is used to analyze the flow resistance inside the expander. By establishing an internal geometric model of the expander and setting boundary conditions, the flow of the fluid in the expander can be simulated to obtain the flow resistance of the expander.

[0061] In a specific embodiment, the four parameters of the residual pressure gas deviation flow rate at the inlet of the expander, the deviation flow rate of the expander, the pressure difference of the expander, and the flow resistance of the expander do not exist independently. The change of the residual pressure gas deviation flow rate not only affects the change of the flow rate, but is also closely related to the pressure change inside the expander. For example, a higher residual pressure gas deviation flow rate usually leads to an increase in the flow rate, thereby changing the pressure difference of the expander at the inlet. When the deviation flow rate increases, the gas pressure at the inlet may also rise, especially when there is a certain flow resistance in the pipeline or valve system. The increased flow rate may cause the pressure of the flow to rise. If the deviation flow rate decreases, the flow pressure of the gas may decrease, resulting in a decrease in the pressure of the gas entering the expander, which will affect the working efficiency and output power of the expander, and the flow resistance of the fluid also depends on the deviation flow rate of the gas. The higher the flow rate, the more obvious the fluid friction and turbulence effect, resulting in increased resistance. Therefore, when the deviation flow rate increases, the flow resistance in the expander also increases. By comprehensively analyzing these interacting parameters, the working state of the expander can be more accurately adjusted, the energy conversion efficiency can be optimized, and the stability and performance of the system can be improved.

[0062] It should be noted that the weight factor corresponding to the residual pressure gas deviation flow rate represents the numerical value of the influence of the residual pressure gas deviation flow rate of the expander on the valve adjustment value of the expander in each monitoring cycle. This correspondence is determined by a pre-set mapping relationship. For example, the residual pressure gas deviation flow rate and the weight factor corresponding to the valve adjustment value of the expander in each preset monitoring cycle obtained from the database form a mapping set, and the residual pressure gas deviation flow rate monitored in real time is input into the mapping set to obtain the corresponding weight factor corresponding to the residual pressure gas deviation flow rate.

[0063] It should be noted that the weight factor corresponding to the residual pressure gas deviation flow rate represents the numerical value of the influence of the residual pressure gas deviation flow rate of the expander on the valve adjustment value of the expander in each monitoring cycle. This correspondence is determined by a pre-set mapping relationship. For example, the residual pressure gas deviation flow rate and the weight factor corresponding to the valve adjustment value of the expander in each preset monitoring cycle obtained from the database form a mapping set, and the residual pressure gas deviation flow rate monitored in real time is input into the mapping set to obtain the corresponding weight factor corresponding to the residual pressure gas deviation flow rate.

[0064] It should be noted that the weight factor corresponding to the pressure difference of the expander represents the numerical value of the influence of the pressure difference of the expander on the valve adjustment value of the expander in each monitoring cycle. This corresponding relationship is determined by a pre-set mapping relationship. For example, the pressure difference of the expander and the weight factor corresponding to the valve adjustment value of the expander in each preset monitoring cycle obtained from the database form a mapping set, and the pressure difference of the expander monitored in real time is input into the mapping set to obtain the weight factor corresponding to the pressure difference of the corresponding expander.

[0065] It should be noted that the weight factor corresponding to the flow resistance of the expander represents the numerical value of the influence of the flow resistance of the expander on the valve adjustment value of the expander in each monitoring cycle. This corresponding relationship is determined by a pre-set mapping relationship. For example, the flow resistance of the expander and the weight factor corresponding to the valve adjustment value of the expander in each preset monitoring cycle obtained from the database form a mapping set, and the flow resistance of the expander monitored in real time is input into the mapping set to obtain the weight factor corresponding to the flow resistance of the corresponding expander.

[0066] It should be noted that when the residual pressure gas enters the expander, the gas will quickly release its compressed energy during the expansion process. The gas changes from a high pressure state (before expansion) to a low pressure state (after expansion). The release of the pressure difference in this process drives the expander impeller to rotate.

[0067] It should be noted that the adjustment of the opening of the intake and exhaust valves is usually related to the load, gas flow, pressure and working state of the power generation system of the expander. Through the coordinated adjustment of the intake and exhaust valves, the smooth operation of the system can be maintained, the working efficiency of the expander can be optimized, and problems such as unstable power generation, system overload and low efficiency can be solved. The intelligent control system can automatically monitor these working conditions and dynamically adjust the valve opening, which helps the expander achieve the best operating state.

[0068] Specifically, the valve of the expander is monitored and regulated, and the specific process is: the valve of the expander is regulated according to the comparison between the valve regulation value of the expander in each monitoring cycle and the set valve regulation requirement threshold of the expander.

[0069] When the valve adjustment value of the expander in a certain monitoring cycle is a positive value and is higher than or equal to the valve adjustment demand threshold of the expander, the intake valve of the expander is closed and the exhaust valve is opened wider; if the valve adjustment value of the expander in a certain monitoring cycle is a negative value and is lower than or equal to the negative number of the valve adjustment demand threshold of the expander, the exhaust valve of the expander is opened less and the intake valve is gradually opened; if the valve adjustment value of the expander in a certain monitoring cycle is a positive value and is lower than the valve adjustment demand threshold of the expander or the valve adjustment value of the expander in a certain monitoring cycle is a negative value and higher than the negative number of the valve adjustment demand threshold of the expander, there is no need to adjust the valve of the expander.

[0070] It should be noted that usually the increase in the opening of the exhaust valve and the decrease in the opening of the exhaust valve of the expander are based on the set proportional control strategy, and the percentage or absolute value of the increase in the opening is calculated according to the difference between the adjustment demand value and the threshold. For example, the larger the difference, the greater the increase in the valve opening. The adjustment process of increasing the opening of the exhaust valve and decreasing the opening of the exhaust valve of the expander is linear, for example, for every increase of 1 unit of demand value, the opening is increased by 2%. The amount by which the exhaust valve reduces its opening is also based on the difference between the valve adjustment demand value and the threshold. Similar control strategies will reduce the opening proportionally according to the degree of reduction in the demand value.

[0071] It should be noted that when the valve adjustment value of the expander in each monitoring cycle is negative and is lower than or equal to the negative of the valve adjustment requirement threshold of the expander, appropriately reducing the exhaust valve of the expander will help ensure that the gas is fully expanded in the expander.

[0072] It should be noted that when the valve adjustment value of the expander in each monitoring cycle is positive and higher than or equal to the valve adjustment demand threshold of the expander, the intake valve of the expander is closed and the exhaust valve is increased, because the intake volume of the expander may be too large, the gas flows in too fast, and the load of the expander increases, so it is necessary to close the intake valve opening, reduce the gas flow rate, and reduce the speed. Increase the exhaust valve opening to reduce the internal gas pressure of the expander.

[0073] It should be noted that if the valve adjustment value of the expander in a certain monitoring period is a positive value but lower than the valve adjustment requirement threshold, or is a negative value but higher than the negative value of the valve adjustment requirement threshold, the expander is within the normal range, so there is no need to adjust the valve.

[0074] It should be noted that the adjustment of the opening of the intake and exhaust valves is usually related to the load of the expander, gas flow, pressure and the working state of the power generation system. Through the coordinated adjustment of the intake and exhaust valves, the smooth operation of the system can be maintained, the working efficiency of the expander can be optimized, and problems such as unstable power generation, system overload, and low efficiency can be solved. The intelligent control system can automatically monitor these working conditions and dynamically adjust the valve opening to achieve the best operating state.

[0075] Specifically, the start and stop parameters inside the expander are monitored and analyzed to obtain the pneumatic performance evaluation value of the expander in each monitoring cycle. The specific process is: monitor the start and stop parameters inside the expander in each monitoring cycle, including the expander inlet temperature, exhaust port temperature, and output power of the expander, divide the expander inlet temperature and the exhaust port temperature to obtain the expansion ratio of the expander, and extract the pressure difference of the expander and the energy conversion efficiency of the expander, and obtain the pneumatic performance evaluation value of the expander in each monitoring cycle after processing. The pneumatic performance evaluation value of the expander in each monitoring cycle is used to evaluate the overall energy conversion efficiency of the expander.

[0076] It should be noted that the inlet temperature, the exhaust temperature and the output power of the expander are monitored respectively by the inlet and exhaust temperature sensors and the output power sensor of the expander.

[0077] It should be noted that before analyzing the pneumatic performance evaluation value of the expander in each monitoring cycle, the expansion ratio of the expander, the energy conversion efficiency of the expander, and the output power of the expander are also analyzed. And the pressure difference representing the expander is denormalized.

[0078] It should be noted that the specific analysis conditions for the evaluation value of the expander's aerodynamic performance in each monitoring cycle are:

[0079] ;

[0080] in, represents the pneumatic performance evaluation value of the expander in the i-th monitoring cycle, represents the expansion ratio of the expander in the i-th monitoring cycle, represents the output power of the expander in the i-th monitoring cycle, represents the pressure difference of the expander in the i-th monitoring cycle, represents the energy conversion efficiency of the expander in the i-th monitoring cycle, Indicates the weight factor corresponding to the expansion ratio of the set expander, Indicates the weight factor corresponding to the output power of the set expander, Indicates the weight factor corresponding to the set pressure difference of the expander, represents the weight factor corresponding to the energy conversion efficiency of the set expander, e represents the natural constant, i represents the number of each monitoring cycle, , n represents the total number of monitoring cycles.

[0081] It should be noted that, in a specific embodiment, the four parameters of the output power of the expander, the expansion ratio of the expander, the pressure difference of the expander, and the energy conversion efficiency of the expander do not exist independently. The change of the expansion ratio will directly affect the pressure difference of the expander, and the change of the pressure difference is closely related to the output power of the expander. For example, when the expansion ratio increases, it usually means that the pressure difference between the air inlet and the exhaust port increases, which means that the expander can convert more pressure energy into mechanical energy through the expansion process, thereby increasing the output power. At the same time, the greater the pressure difference inside the expander, the higher the energy conversion efficiency of the expander in converting the residual pressure gas into mechanical energy, which can increase the output power of the power generation. However, if the expansion ratio and the pressure difference are too large, the working state of the expander may be too intense, which may increase the energy loss, thereby reducing the energy conversion efficiency, increasing the load inside the system, and affecting the long-term operation stability. And the lower expansion ratio and pressure difference will cause the output power of the expander to decrease, which may cause the equipment to fail to fully utilize the energy of the residual pressure gas and reduce the power generation efficiency. Therefore, these three parameters interact with each other, the change of the expansion ratio will affect the pressure difference, and the change of the pressure difference will affect the output power. The synergistic effect of the three plays a key role in the overall working performance of the expander.

[0082] It should be noted that the energy conversion efficiency of the expander can be evaluated by measuring the energy input through the electric power meter, for example, by calculating the gas flow measured by the flow meter and its calorific value and dividing the output power by the input energy.

[0083] It should be noted that the weight factor corresponding to the expansion ratio of the expander represents the numerical value of the influence of the expansion ratio of the expander on the aerodynamic performance evaluation value of the expander. This correspondence is determined by a pre-set mapping relationship. For example, the expansion ratio of the expander and the weight factor corresponding to the aerodynamic performance evaluation value of the expander in the preset monitoring period obtained from the database form a mapping set, and the expansion ratio of the expander monitored in real time is input into the mapping set to obtain the corresponding weight factor corresponding to the expansion ratio of the expander.

[0084] It should be noted that the weight factor corresponding to the output power of the expander represents the numerical value of the influence of the output power of the expander on the aerodynamic performance evaluation value of the expander. This correspondence is determined by a pre-set mapping relationship. For example, the output power of the expander and the weight factor corresponding to the aerodynamic performance evaluation value of the expander in the preset monitoring period obtained in the database form a mapping set, and the output power of the expander monitored in real time is input into the mapping set to obtain the weight factor corresponding to the output power of the corresponding expander.

[0085] It should be noted that the weight factor corresponding to the energy conversion efficiency of the expander represents the numerical value of the influence of the energy conversion efficiency of the expander on the aerodynamic performance evaluation value of the expander. This correspondence is determined by a pre-set mapping relationship. For example, the energy conversion efficiency of the expander and the weight factor corresponding to the aerodynamic performance evaluation value of the expander in the preset monitoring period obtained in the database form a mapping set, and the energy conversion efficiency of the expander monitored in real time is input into the mapping set to obtain the weight factor corresponding to the energy conversion efficiency of the corresponding expander.

[0086] Specifically, the aerodynamic performance evaluation value of the expander in each monitoring period is compared with the aerodynamic performance evaluation threshold stored in the database. If the aerodynamic performance evaluation value of the expander in a certain monitoring period is higher than the aerodynamic performance evaluation threshold, the aerodynamic performance evaluation value of the expander in the monitoring period is difference processed with the aerodynamic performance evaluation threshold to obtain a first difference in the aerodynamic performance evaluation of the expander. The first difference in the aerodynamic performance evaluation of the expander is matched with the first standard deviation of the aerodynamic performance evaluation of the expander in the database in each interval corresponding to the first impeller speed adjustment value to obtain the first impeller speed adjustment value of the expander, thereby reducing the impeller speed according to the first adjustment value of the impeller speed of the expander.

[0087] It should be noted that performing difference processing on the pneumatic performance evaluation value of the expander in each monitoring cycle and the pneumatic performance evaluation threshold value is to subtract the pneumatic performance evaluation value of the expander in each monitoring cycle from the pneumatic performance evaluation threshold value.

[0088] If the aerodynamic performance evaluation value of the expander in a certain monitoring period is lower than the aerodynamic performance evaluation threshold, the aerodynamic performance evaluation threshold is subjected to difference processing with the aerodynamic performance evaluation value of the expander in the monitoring period to obtain a second difference in the aerodynamic performance evaluation of the expander, and the second difference in the aerodynamic performance evaluation of the expander is matched with the second adjustment value of the impeller speed corresponding to the second standard deviation of the aerodynamic performance evaluation of the expander in the database in each interval to obtain the second adjustment value of the impeller speed of the expander, thereby increasing the impeller speed according to the second adjustment value of the impeller speed of the expander.

[0089] If the aerodynamic performance evaluation value of the expander in each monitoring cycle is equal to the aerodynamic performance evaluation threshold, the impeller speed of the expander is not adjusted.

[0090] It should be noted that performing difference processing on the pneumatic performance evaluation threshold value and the pneumatic performance evaluation value of the expander in the monitoring cycle is to subtract the pneumatic performance evaluation threshold value from the pneumatic performance evaluation value of the expander in each monitoring cycle.

[0091] It should be noted that when the pneumatic performance evaluation value of the expander in a certain monitoring cycle is higher than the pneumatic performance evaluation threshold and the difference between the pneumatic performance evaluation value of the expander in each monitoring cycle and the pneumatic performance evaluation threshold is high, it indicates that the expander is working efficiently. At this time, the impeller speed can be reduced to avoid excessive energy consumption or system overheating. When the pneumatic performance evaluation value of the expander in a certain monitoring cycle is lower than or equal to the pneumatic performance evaluation threshold and the difference between the pneumatic performance evaluation threshold and the pneumatic performance evaluation value of the expander in each monitoring cycle is low, it indicates that the energy conversion efficiency of the expander is low, which may be due to insufficient gas expansion or insufficient pressure difference. At this time, the impeller speed should be increased to increase the gas flow rate and promote the expansion process to be more efficient. The impeller speed is dynamically adjusted by real-time monitoring of the pneumatic performance evaluation value to maintain the expander operating under optimal conditions. This adjustment can be completed through an automatic control system, and the adjustment effect can be fed back by monitoring changes in parameters such as temperature, pressure difference, and output power.

[0092] Specifically, the leakage risk assessment value of each key position of the expander is obtained. The specific process is: extract the gas leakage data of each key position of the expander, including natural gas concentration and vibration frequency, and obtain the leakage risk assessment value of each key position of the expander after processing. The leakage risk assessment value of each key position of the expander is used to determine the severity of gas leakage at each key position of the expander.

[0093] It should be noted that the natural gas concentration and vibration frequency at each key position of the expander are monitored by a natural gas concentration sensor and a vibration sensor respectively.

[0094] It should be noted that the leakage risk assessment values ​​at each key position of the expander are analyzed under the following specific conditions:

[0095] ;

[0096] In the formula, represents the leakage risk assessment value of the jth key position of the expander, represents the natural gas concentration at the jth key position of the expander, represents the vibration frequency of the jth key position of the expander, Indicates the natural gas concentration limit of the set expander. Indicates the natural gas limit vibration frequency of the set expander, Indicates the correction factor corresponding to the set natural gas concentration, It indicates the correction factor corresponding to the set vibration frequency, j indicates the number of each key position, , m represents the total number of key positions, and e represents a natural constant.

[0097] It should be noted that, in a specific embodiment, the two parameters of natural gas concentration and vibration frequency do not exist independently. Changes in natural gas concentration will directly affect the vibration characteristics of the environment around the expander, and changes in vibration frequency are closely related to the risk of gas leakage. For example, when the natural gas concentration increases, it usually means that there is a potential leakage source near the expander, which may cause abnormal vibration around the equipment, thereby causing an increase in vibration frequency. A higher natural gas concentration often means that the gas leakage is more serious, and the flow rate of the leaking gas will increase the disturbance of the local air, which will lead to an abnormal increase in the vibration frequency. On the contrary, if the natural gas concentration is low, it indicates that the operating state of the expander is relatively normal. The natural gas defined vibration frequency of the expander represents the critical maximum value at which the operation of the expander may go wrong. Excessive vibration frequency may mean that the natural gas leakage has reached a dangerous level and timely measures need to be taken. Therefore, the two parameters are interrelated, and changes in natural gas concentration will cause fluctuations in vibration frequency, while changes in vibration frequency provide a key basis for the detection and evaluation of gas leakage. By analyzing the interaction between these two parameters, the risk of gas leakage can be more accurately assessed and timely regulatory decisions can be made.

[0098] In a specific embodiment, the correction factor corresponding to the natural gas concentration of the expander generally ranges from 0 to 1. When in use, the correction factor corresponding to the natural gas concentration can be directly obtained from the database of the expander monitoring system. The correspondence between the correction factor and the natural gas concentration is determined by a pre-set mapping table. By inputting the real-time detected natural gas concentration into the mapping table, the correction factor corresponding to the natural gas concentration can be quickly obtained, which can help optimize the gas flow and pressure regulation process, thereby reducing the risk of leakage and ensuring the safe operation of the expander.

[0099] In a specific embodiment, the correction factor corresponding to the vibration frequency of the expander generally ranges from 0 to 1. When in use, the correction factor corresponding to the vibration frequency can be directly obtained from the database of the expander monitoring system. The correspondence between the correction factor and the vibration frequency is determined by a pre-set mapping table. By inputting the vibration frequency detected in real time into the mapping table, the correction factor corresponding to the vibration frequency can be quickly obtained, which can guide the maintenance and regulation of the expander, ensure the normal operation of the equipment, and reduce potential failures and safety hazards caused by abnormal vibration.

[0100] Specifically, according to the leakage risk assessment values ​​of each key position of the expander, the gas leakage position of the expander is analyzed and located, and regulation is performed. The specific process is: according to the leakage risk assessment values ​​of each key position of the expander, they are compared with the preset leakage risk assessment threshold. If the leakage risk assessment value of a key position of the expander is higher than the leakage risk assessment threshold, the key position of the expander is marked as a leakage position, thereby obtaining the leakage positions of the expander, starting emergency ventilation, closing the valve of the expander, and triggering the alarm mechanism to notify the operator.

[0101] It should be noted that combustible gas leakage sensors are installed at various key locations of the expander system, including the air intake pipe, around the expander, and the exhaust pipe, to monitor gas leakage data.

[0102] It should be noted that when a leak occurs, the system will automatically isolate the possible leak source, close related pipelines and equipment to prevent further leakage of natural gas. Once a natural gas leak is detected, the emergency ventilation system will start, close the valve, and evacuate the gas in the leaking area to avoid fire or explosion. The leaked natural gas will be introduced into a dedicated exhaust system for safe treatment and dilution to reduce harm to the environment.

[0103] Specifically, the operating performance of the expander is comprehensively evaluated and the intelligent control result of the expander is obtained. The specific process is: extracting the valve adjustment value of the expander in each monitoring cycle, the pneumatic performance evaluation value of the expander in each monitoring cycle and the leakage risk assessment value of each key position of the expander, extracting the power generation of the expander in each monitoring cycle, and integrating them to obtain the comprehensive evaluation value of the expander in each monitoring cycle.

[0104] The comprehensive evaluation value of the expander in each monitoring cycle is compared with the preset comprehensive evaluation threshold of the expander, and the number of comprehensive evaluation values ​​of the expander in each monitoring cycle that are greater than or equal to the preset comprehensive evaluation threshold is counted, and recorded as the number of qualified intelligent control of the expander; if the number of qualified intelligent control of the expander is higher than or equal to the preset qualified standard number of the expander, the intelligent control result of the expander is set to qualified; if the number of qualified intelligent control of the expander is lower than the preset qualified standard number of the expander, the intelligent control result of the expander is set to unqualified, and the staff is notified to inspect the expander.

[0105] Specifically, the comprehensive evaluation value of the expander in each monitoring cycle, the specific analysis conditions are:

[0106] ;

[0107] In the formula, represents the comprehensive evaluation value of the i-th expander, represents the leakage risk assessment value of the expander, represents the pneumatic performance evaluation value of the expander in the i-th monitoring cycle, represents the valve adjustment value of the expander in the i-th monitoring cycle, Indicates the valve adjustment threshold of the expander, represents the power generation of the expander in the i-th monitoring cycle, Indicates the weight factor corresponding to the preset leakage risk assessment value, Indicates the weight factor corresponding to the preset aerodynamic performance evaluation value, Indicates the weight factor corresponding to the preset valve adjustment demand value, represents the weight factor corresponding to the power generation of the preset expander, i represents the number of each monitoring period, , n represents the total number of monitoring cycles.

[0108] It should be added that, in this embodiment, the weight factor corresponding to the preset leakage risk assessment value, the weight factor corresponding to the preset pneumatic performance assessment value, the weight factor corresponding to the preset valve adjustment demand value and the weight factor corresponding to the preset expander power generation are obtained from the database.

[0109] It should be noted that the weight factor corresponding to the leakage risk assessment value represents the numerical value of the influence of the leakage risk assessment value at each key position of the expander on the safety analysis index value. This correspondence is determined by a pre-set mapping relationship. For example, the leakage risk assessment value at each key position of the expander and the weight factor corresponding to the preset leakage risk assessment value obtained in the database form a mapping set, and the leakage risk assessment value monitored in real time is input into the mapping set to obtain the weight factor corresponding to the corresponding leakage risk assessment value.

[0110] It should be noted that the weight factor corresponding to the aerodynamic performance evaluation value represents the numerical value of the influence of the aerodynamic performance evaluation value of the expander on the overall operating performance analysis index value. This correspondence is determined by a pre-set mapping relationship. For example, the aerodynamic performance evaluation value of the expander and the weight factor corresponding to the preset aerodynamic performance evaluation value obtained in the database form a mapping set, and the aerodynamic performance evaluation value monitored in real time is input into the mapping set to obtain the weight factor corresponding to the aerodynamic performance evaluation value.

[0111] It should be noted that the weight factor corresponding to the valve regulation demand value represents the numerical value of the influence of the valve regulation value of the expander on the valve regulation demand value. This correspondence is determined by a pre-set mapping relationship. For example, the valve regulation value of the expander and the weight factor corresponding to the preset valve regulation demand value obtained from the database form a mapping set, and the valve regulation demand value monitored in real time is input into the mapping set to obtain the weight factor corresponding to the valve regulation demand value.

[0112] It should be noted that the weight factor corresponding to the power generation of the expander represents the numerical value of the influence of the power generation on the overall operating efficiency analysis index value. This correspondence is determined by a pre-set mapping relationship. For example, the real-time power generation of the expander and the weight factor corresponding to the preset power generation obtained from the power generation database form a mapping set, and the real-time monitored power generation is input into the mapping set to obtain the weight factor corresponding to the power generation of the expander.

[0113] As shown in Table 1, Table 1 is example data of the comprehensive evaluation value of the expander, which lists parameters such as the valve adjustment value of the expander in each monitoring cycle, the leakage risk evaluation value of the expander, and the pneumatic performance evaluation value of the expander in each monitoring cycle.

[0114] Table 1 Example data of comprehensive evaluation value of expander

[0115]

[0116] As shown in Table 1, in a specific embodiment, the weight factor corresponding to the leakage risk assessment value is 0.3, the weight factor corresponding to the pneumatic performance evaluation value is 0.5, the weight factor corresponding to the valve adjustment demand value is 0.2, the weight factor corresponding to the power generation is 0.4, the valve adjustment value of the expander is 0.5, the leakage risk assessment value of the expander is 0.4, the valve adjustment threshold of the expander is 0.6, and as the pneumatic performance evaluation value of the expander increases, the comprehensive evaluation value of the expander also shows an increasing trend.

[0117] In a specific embodiment, Figure 3 As shown, Figure 3 It is the comprehensive evaluation value curve of the expander, specifically expressed as the comprehensive evaluation value curve of the expander corresponding to the power generation of different expanders in a certain monitoring period, wherein the horizontal axis represents the aerodynamic performance evaluation value of the expander, and the vertical axis represents the comprehensive evaluation value of the expander. Three groups of different example parameters are defined in the figure, corresponding to different situations of the three curves, respectively represented by solid lines, dotted lines and dotted lines, and the corresponding curve labels are a, b, and c, respectively. When the power generation of the expander is 1, the schematic diagram of the comprehensive evaluation value curve of the expander is shown in curve a, when the power generation of the expander is 2, the schematic diagram of the comprehensive evaluation value curve of the expander is shown in curve b, and when the power generation of the expander is 3, the schematic diagram of the comprehensive evaluation value curve of the expander is shown in curve c.

[0118] like Figure 4 As shown, the second aspect of the present invention also provides a control method for an intelligent expander residual pressure power generation system, including: converting the residual pressure gas collected by the expander into mechanical energy, and monitoring the load information of the expander, obtaining the valve adjustment value of the expander in each monitoring cycle, and monitoring and regulating the valve of the expander.

[0119] The start and stop parameters inside the expander are monitored and analyzed to obtain the aerodynamic performance evaluation value of the expander in each monitoring cycle, and the speed of the expander impeller is adjusted according to the aerodynamic performance evaluation value of the expander in each monitoring cycle.

[0120] Monitor the gas leakage data at each key position of the expander to obtain the leakage risk assessment value of each key position of the expander. According to the leakage risk assessment value of each key position of the expander, analyze and locate the gas leakage position of the expander and perform regulation.

[0121] Monitor the power generation data of the expander, conduct a comprehensive evaluation of the operating performance of the expander and obtain the intelligent control results of the expander.

[0122] A residual pressure power generation system applied to an intelligent expander also includes a database, which is used to store a valve adjustment demand threshold of the expander, a pneumatic performance evaluation threshold, a first impeller speed adjustment value corresponding to each interval of the first standard deviation value of the pneumatic performance evaluation of the expander, a second impeller speed adjustment value corresponding to each interval of the second standard deviation value of the pneumatic performance evaluation of the expander, a leakage risk evaluation threshold, a comprehensive evaluation threshold, a weight factor corresponding to the leakage risk evaluation value, a weight factor corresponding to the pneumatic performance evaluation value, a weight factor corresponding to the valve adjustment demand value, a weight factor corresponding to the power generation of the expander, a weight factor corresponding to the energy conversion efficiency of the expander, a reference expansion ratio of the expander, a reference output power of the expander, a reference pressure difference of the expander, a correction factor corresponding to the expansion ratio of the expander, a correction factor corresponding to the output power of the expander, and a weight factor corresponding to the pressure difference of the expander.

[0123] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0124] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An intelligent expander residual pressure power generation system, characterized in that: include: The valve monitoring and control module is used to convert the residual pressure gas collected by the expander into mechanical energy, monitor the load information of the expander in each preset monitoring cycle, process the valve adjustment value of the expander in each monitoring cycle, and monitor and control the valve of the expander; The speed control module is used to monitor and analyze the start and stop parameters inside the expander, obtain the pneumatic performance evaluation value of the expander in each monitoring cycle, and adjust the speed of the expander impeller according to the pneumatic performance evaluation value of the expander in each monitoring cycle; A leakage control module is used to monitor the gas leakage data of each key position of the expander, obtain the leakage risk assessment value of each key position of the expander, analyze and locate the gas leakage position of the expander and perform regulation according to the leakage risk assessment value of each key position of the expander; The power generation monitoring module is used to monitor the power generation data of the expander, conduct a comprehensive evaluation of the operating performance of the expander and obtain the intelligent control results of the expander; The specific process of obtaining the valve adjustment value of the expander in each monitoring cycle is as follows: Monitor the load information of the expander in each monitoring cycle, wherein the load information of the expander includes the residual pressure gas flow rate, flow velocity, and pressure of the inlet and the residual pressure gas flow rate, flow velocity, and pressure of the exhaust, respectively, perform difference processing to obtain the residual pressure gas deviation flow rate of the expander, the deviation flow velocity of the expander, and the pressure difference of the expander, and extract the flow resistance of the expander, and obtain the valve adjustment value of the expander in each monitoring cycle after processing, wherein the valve adjustment value of the expander in each monitoring cycle reflects the degree to which the valve of the expander needs to be adjusted; The start-stop parameters inside the expander are monitored and analyzed to obtain the pneumatic performance evaluation value of the expander in each monitoring cycle. The specific process is as follows: In each monitoring cycle, the start and stop parameters inside the expander are monitored, including the expander air inlet temperature, the exhaust port temperature, and the output power of the expander, the expander air inlet temperature and the exhaust port temperature are divided to obtain the expansion ratio of the expander, and the pressure difference of the expander and the energy conversion efficiency of the expander are extracted, and the pneumatic performance evaluation value of the expander in each monitoring cycle is obtained after processing, and the pneumatic performance evaluation value of the expander in each monitoring cycle is used to evaluate the overall energy conversion efficiency of the expander; The specific process of obtaining the leakage risk assessment value of each key position of the expander is as follows: Extracting gas leakage data at each key position of the expander, including natural gas concentration and vibration frequency, and processing to obtain leakage risk assessment values ​​at each key position of the expander, wherein the leakage risk assessment values ​​at each key position of the expander are used to determine the severity of gas leakage at each key position of the expander; The specific process of comprehensively evaluating the operating performance of the expander and obtaining the intelligent control result of the expander is as follows: Extract the valve adjustment value of the expander in each monitoring cycle, the pneumatic performance evaluation value of the expander in each monitoring cycle, and the leakage risk evaluation value of each key position of the expander, extract the power generation of the expander in each monitoring cycle, and integrate them to obtain the comprehensive evaluation value of the expander in each monitoring cycle; The comprehensive evaluation value of the expander in each monitoring cycle is compared with the preset comprehensive evaluation threshold of the expander, and the number of monitoring cycles in which the comprehensive evaluation value is greater than or equal to the preset comprehensive evaluation threshold is counted, and recorded as the number of qualified operation cycles of the expander; if the number of qualified operation cycles of the expander is higher than or equal to the preset number of qualified standard operation cycles of the expander, the intelligent control result of the expander is set to qualified; if the number of qualified operation cycles of the expander is lower than the preset number of qualified standard operation cycles of the expander, the intelligent control result of the expander is set to unqualified, and the staff is notified to inspect and repair the expander.

2. According to claim 1, the intelligent expander residual pressure power generation system is characterized in that: The specific process of monitoring and regulating the expander valve is as follows: The valve of the expander is adjusted according to the result of comparing the valve adjustment value of the expander in each monitoring cycle with the set valve adjustment threshold of the expander; When the valve adjustment value of the expander in a certain monitoring cycle is a positive value and is higher than or equal to the valve adjustment threshold of the expander, the intake valve of the expander is closed and the exhaust valve is increased in opening; if the valve adjustment value of the expander in a certain monitoring cycle is a negative value and is lower than or equal to the negative number of the valve adjustment threshold of the expander, the exhaust valve of the expander is reduced in opening and the intake valve is gradually increased; if the valve adjustment value of the expander in a certain monitoring cycle is a positive value and is lower than the valve adjustment threshold of the expander or the valve adjustment value of the expander in a certain monitoring cycle is a negative value and higher than the negative number of the valve adjustment threshold of the expander, there is no need to adjust the valve of the expander.

3. According to claim 1, the intelligent expander residual pressure power generation system is characterized in that: The specific process of adjusting the speed of the expander impeller according to the pneumatic performance evaluation value of the expander in each monitoring cycle is as follows: According to the comparison between the pneumatic performance evaluation value of the expander in each monitoring cycle and the pneumatic performance evaluation threshold value stored in the database, if the pneumatic performance evaluation value of the expander in a certain monitoring cycle is higher than the pneumatic performance evaluation threshold value, the pneumatic performance evaluation value of the expander in the monitoring cycle is subjected to difference processing with the pneumatic performance evaluation threshold value to obtain a first difference in the pneumatic performance evaluation of the expander, and the first difference in the pneumatic performance evaluation of the expander is matched with a first adjustment value of the impeller speed corresponding to a first standard deviation of the pneumatic performance evaluation of the expander in each interval to obtain a first adjustment value of the impeller speed of the expander, thereby reducing the impeller speed according to the first adjustment value of the impeller speed of the expander; If the pneumatic performance evaluation value of the expander in a certain monitoring period is lower than the pneumatic performance evaluation threshold, the pneumatic performance evaluation threshold is subjected to difference processing with the pneumatic performance evaluation value of the expander in the monitoring period to obtain a second difference in the pneumatic performance evaluation of the expander, and the second difference in the pneumatic performance evaluation of the expander is matched with the second adjustment value of the impeller speed corresponding to the second standard deviation of the pneumatic performance evaluation of the expander in each interval in the database to obtain the second adjustment value of the impeller speed of the expander, thereby increasing the impeller speed according to the second adjustment value of the impeller speed of the expander; If the aerodynamic performance evaluation value of the expander in each monitoring cycle is equal to the aerodynamic performance evaluation threshold, the impeller speed of the expander is not adjusted.

4. According to claim 1, the intelligent expander residual pressure power generation system is characterized in that: According to the leakage risk assessment value of each key position of the expander, the gas leakage position of the expander is analyzed and located and regulated. The specific process is as follows: The leakage risk assessment value of each key position of the expander is compared with the preset leakage risk assessment threshold. If the leakage risk assessment value of a key position of the expander is higher than the leakage risk assessment threshold, the key position of the expander is marked as a leakage position, thereby obtaining the leakage positions of the expander, starting emergency ventilation, closing the valve of the expander, and triggering the alarm mechanism to notify the operator.

5. According to claim 1, the intelligent expander residual pressure power generation system is characterized in that: The comprehensive evaluation value of the expander in each monitoring cycle, the specific analysis conditions are: ； In the formula, represents the comprehensive evaluation value of the i-th expander, represents the leakage risk assessment value of the expander, represents the pneumatic performance evaluation value of the expander in the i-th monitoring cycle, represents the valve adjustment value of the expander in the i-th monitoring cycle, Indicates the valve adjustment threshold of the expander, represents the power generation of the expander in the i-th monitoring cycle, Indicates the weight factor corresponding to the preset leakage risk assessment value, Indicates the weight factor corresponding to the preset aerodynamic performance evaluation value, Indicates the weight factor corresponding to the preset valve adjustment demand value, represents the weight factor corresponding to the power generation of the preset expander, i represents the number of each monitoring period, , n represents the total number of monitoring cycles.

6. A control method for the intelligent expander residual pressure power generation system according to any one of claims 1 to 5, characterized in that: include: The residual pressure gas collected by the expander is converted into mechanical energy, and the load information of the expander is monitored in each preset monitoring cycle, and the valve adjustment value of the expander in each monitoring cycle is obtained by processing, and the valve of the expander is monitored and regulated; Monitor and analyze the start and stop parameters inside the expander to obtain the pneumatic performance evaluation value of the expander in each monitoring cycle, and adjust the speed of the expander impeller according to the pneumatic performance evaluation value of the expander in each monitoring cycle; Monitor the gas leakage data at each key position of the expander, obtain the leakage risk assessment value of each key position of the expander, analyze and locate the gas leakage position of the expander and perform regulation according to the leakage risk assessment value of each key position of the expander; Monitor the power generation data of the expander, conduct a comprehensive evaluation of the operating performance of the expander and obtain the intelligent control results of the expander.

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