Pneumatic conveying gas recovery system

Abstract

The invention relates to the technical field of pneumatic conveying, and discloses a pneumatic conveying gas recovery system which comprises a spraying module connected with a raw material gas inlet, the spraying module comprises a spraying tower and a spraying pump, and the spraying tower is connected with the spraying pump; the collecting and filtering module is connected with the spraying module, and the second pressure indicator is connected with a plurality of security filters; the gas purifying module is connected with the collecting and filtering module and the spraying module; the gas buffer module is connected with the gas purification module, and the gas buffer tank is connected with the gas output port; the monitoring module is connected with the gas buffer module; the electrical control module is electrically connected with the spraying module, the collecting and filtering module, the gas buffering module and the monitoring module, and the electrical control module is used for controlling the working states of the collecting and filtering module and the gas buffering module. According to the invention, the nitrogen recovery efficiency and the pneumatic conveying reliability are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pneumatic conveying technology, in particular to a pneumatic conveying gas recovery system. BACKGROUND

[0002] The pneumatic conveying system uses inert gas such as nitrogen as conveying medium and is widely used in the environment of material conveying. In the existing pneumatic conveying gas system, the recovered gas (including nitrogen, argon or other inert gas) will pass through a bag dust removal process to remove the dust entrained in the gas. However, in the actual operation process, the bag dust removal is difficult to achieve purification of the dust, and dust particles will still remain in the recovered gas. At the same time, the recovered gas will come into contact with air, resulting in the inclusion of certain air components in the recovered gas. When the recovered gas including air reenters the system for recycling, the oxygen and other components in the air will continuously accumulate and enrich in the recycling process, causing the content of other components in the recycled gas to continuously increase. The change in the composition of the conveying medium not only affects the conveying quality and safety of the material, but also causes system operation failure, resulting in insufficient reliability of the pneumatic conveying system.

[0003] Therefore, it is necessary to design a pneumatic conveying gas recovery system to solve the problems existing in the prior art. SUMMARY

[0004] In view of this, the present application provides a pneumatic conveying gas recovery system to solve the problem that the conveying medium cannot guarantee the conveying quality and safety of the material, dust particles remain in the recovered gas, and the reliability of the pneumatic conveying system is insufficient.

[0005] The present application provides a pneumatic conveying gas recovery system, comprising: A spraying module is connected with the raw gas inlet, and comprises a spraying tower and a spraying pump, wherein the spraying tower is connected with the spraying pump; A collection and filtration module is connected with the spraying module, and comprises a collection unit, a filtration unit and a pressure stabilizing unit, wherein one end of the filtration unit is connected with the collection unit, the other end of the filtration unit is connected with the pressure stabilizing unit, the filtration unit comprises a second pressure indicator and a plurality of safety filters, and the second pressure indicator is connected with the plurality of safety filters; A gas purification module is connected with the collection and filtration module and the spraying module; A gas buffer module is connected with the gas purification module, and comprises a third pressure indicator, a gas buffer tank and a gas output port, wherein the third pressure indicator is arranged on the sidewall of the gas buffer tank, and the gas buffer tank is connected with the gas output port; A monitoring module is connected with the gas buffer module; An electrical control module is electrically connected with the spraying module, the collection and filtration module, the gas buffer module and the monitoring module, and is used to control the working states of the collection and filtration module and the gas buffer module.

[0006] Further, the collection unit comprises a constant-pressure collection tank, a drain port and a first pressure indicator, the first pressure indicator is arranged on the sidewall of the constant-pressure collection tank, and the drain port is connected to the bottom of the constant-pressure collection tank.

[0007] Further, the constant-pressure unit comprises a supercharger and a frequency converter, and the frequency converter is connected to the supercharger.

[0008] Further, the gas purification module is used to remove impurities from the gas output by the constant-pressure unit, recycle the gas according to the removal result, and when the gas after removal meets the nitrogen requirement, the gas is delivered to the gas buffer module, and when the gas after removal does not meet the nitrogen requirement, the gas is delivered to the spraying module for further water washing.

[0009] Further, the gas buffer module further comprises a gas input port, a pressure regulator and a flow regulator, one end of the flow regulator is connected to the gas input port, the other end of the flow regulator is connected to the pressure regulator, and one end of the pressure regulator away from the flow regulator is connected to the sidewall of the gas buffer tank.

[0010] Further, the monitoring module comprises a plurality of monitoring units, and the constant-pressure collection tank and the gas buffer tank are connected to a waste gas vent.

[0011] Further, the electrical control module comprises a collection and judgment unit and a processing and control unit. The collection and judgment unit is configured to collect the constant-pressure tank pressure of the first pressure indicator and the filter pressure of the second pressure indicator, judge whether to execute a switching strategy according to the constant-pressure tank pressure and the filter pressure, and determine the target constant-pressure tank pressure of the first pressure indicator. The processing and control unit is configured to determine the rotational speed of the supercharger based on the target constant-pressure tank pressure and a rotational speed adjustment model, determine the buffer tank pressure of the third pressure indicator based on the rotational speed, judge whether to adjust the valve opening degree of the pressure regulator according to the change of the buffer tank pressure, and adjust the valve opening degree of the pressure regulator according to the change value of the buffer tank pressure.

[0012] Further, when judging whether to execute a switching strategy according to the constant-pressure tank pressure and the filter pressure and determining the target constant-pressure tank pressure of the first pressure indicator, the following steps are included: The acquisition and judgment unit obtains the pressure difference between the filter pressure and the pressure stabilizing tank pressure, and compares the pressure difference with a pressure difference threshold. When the pressure difference is greater than or equal to the pressure difference threshold, it is determined that the switching strategy will be executed, and the pressure of the first pressure indicator after the switching strategy is executed will be determined as the target pressure of the pressure stabilizing tank. When the pressure difference is less than the pressure difference threshold, it is determined that the switching strategy will not be executed, and the current pressure of the pressure stabilizing tank will be determined as the target pressure of the pressure stabilizing tank.

[0013] Furthermore, when determining the rotational speed of the booster compressor based on the target pressure tank pressure and speed regulation model, the following steps are included: The acquisition and judgment unit obtains the set of operating parameters and divides the set of operating parameters into a training set and a test set according to a 4:1 ratio. It finds model parameters based on grid search and establishes a random forest model. It trains the random forest model based on the training set and substitutes the test set into the trained random forest model to determine the accuracy. When the accuracy is greater than or equal to the accuracy threshold, the currently trained random forest model is determined as the speed adjustment model; otherwise, the learning rate of the currently trained random forest model is adjusted and training continues. The target pressure stabilizing tank pressure is substituted into the speed regulation model to determine the rotational speed of the booster.

[0014] Furthermore, when determining whether to adjust the valve opening of the pressure regulator based on the change in the pressure of the buffer tank, and adjusting the valve opening of the pressure regulator according to the change in the pressure of the buffer tank, the process includes: The processing control unit acquires the historical buffer tank pressure change value within a unit time and determines the historical buffer tank pressure change average value. If the buffer tank pressure change value within a unit time is greater than or equal to the historical buffer tank pressure change average value, it determines to adjust the valve opening of the pressure regulator; otherwise, it does not adjust the valve opening of the pressure regulator. When it is determined that the valve opening of the pressure regulator should be adjusted, the pressure difference between the change value of the buffer tank pressure and the historical average value of the buffer tank pressure change is obtained. A first pressure difference value and a second pressure difference value are preset, wherein the first pressure difference value is greater than the second pressure difference value; When the pressure difference is greater than or equal to the first pressure difference, the valve opening of the pressure regulator is adjusted according to the third valve coefficient. When the pressure difference is less than the first pressure difference but greater than the second pressure difference, the valve opening of the pressure regulator is adjusted according to the second valve coefficient. When the pressure difference is less than or equal to the second pressure difference, the valve opening of the pressure regulator is adjusted according to the first valve coefficient. The range of the valve coefficient is: 1 < first valve coefficient < second valve coefficient < third valve coefficient. The valve opening of the pressure regulator is directly proportional to the valve coefficient.

[0015] Compared with existing technologies, the advantages of this invention are as follows: The spray tower and spray pump in the spray module work together to spray the recovered gas entering the raw material gas inlet. Liquid adsorption removes some dust particles, reducing the load on subsequent filtration stages and optimizing the gas purification effect. The collection and filtration module achieves gas-liquid separation after spraying through a collection unit. Several security filters in the filtration unit perform deep filtration of the gas, further trapping residual dust and ensuring the purity of nitrogen. A second pressure indicator monitors the working pressure of the security filters in real time, promptly identifying filter blockages and ensuring the continuous and stable operation of the filtration unit. The pressure stabilizing unit prevents pressure fluctuations from affecting subsequent processing. The gas purification module removes air components from the filtered gas, preventing the accumulation of oxygen and other components in the recovery cycle, ensuring the purity of the conveying medium nitrogen, and avoiding changes in composition that could affect the quality and safety of material conveying. The gas buffer tank is responsible for storing purified nitrogen. The third pressure indicator monitors the pressure inside the tank in real time, ensuring the stability of the gas pressure at the gas outlet and providing a stable medium supply for pneumatic conveying. The electrical control module is electrically connected to each module, realizing automated operation, thereby reducing manual intervention and improving the reliability and stability of the system operation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a pneumatic conveying gas recovery system provided in an embodiment of the present invention; Figure 2 This is a functional block diagram of an electrical control module provided in an embodiment of the present invention.

[0018] In the diagram: 1. Exhaust gas vent; 2. Electrical control module; 3. Raw material gas inlet; 4. Spray tower; 5. Spray pump; 6. Pressure stabilizing collection tank; 7. Drain outlet; 8. Security filter; 9. First pressure indicator; 10. Second pressure indicator; 11. Booster compressor; 12. Frequency converter; 13. Gas purification module; 14. Third pressure indicator; 15. Gas buffer tank; 16. Monitoring unit; 19. Gas outlet; 20. Gas inlet; 21. Pressure regulator; 22. Flow regulator. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] See Figure 1 As shown in some embodiments of this application, a pneumatic conveying gas recovery system includes: a spray module connected to a raw material gas inlet 3, comprising a spray tower 4 and a spray pump 5, the spray tower 4 being connected to the spray pump 5; a collection and filtration module connected to the spray module, comprising a collection unit, a filtration unit, and a pressure stabilizing unit, one end of the filtration unit being connected to the collection unit, and the other end of the filtration unit being connected to the pressure stabilizing unit, the filtration unit comprising a second pressure indicator 10 and a plurality of security filters 8, the second pressure indicator 10 being connected to the plurality of security filters 8; a gas purification module 13 connected to the collection and filtration module and the spray module; a gas buffer module connected to the gas purification module 13, comprising a third pressure indicator 14, a gas buffer tank 15, and a gas outlet 19, the third pressure indicator 14 being disposed on the side wall of the gas buffer tank 15, the gas buffer tank 15 being connected to the gas outlet 19; and a monitoring module connected to the gas buffer module. Electrical control module 2 is electrically connected to the spray module, the collection and filtration module, the gas buffer module, and the monitoring module. Electrical control module 2 is used to control the working status of the collection and filtration module and the gas buffer module.

[0022] Specifically, the spray module consists of a spray tower 4 and a spray pump 5. The raw material gas inlet 3 is connected to the spray tower 4, and the spray pump 5 is also connected to the spray tower 4. The raw material gas inlet 3 is used to receive the recovery gas (including nitrogen, argon, or other inert gases) containing dust particles. In this system, nitrogen is used as an example for nitrogen recovery; other gases, such as argon or other inert gases, can also be recovered using this system. The raw material gas inlet 3 receiving the recovery gas containing dust particles is essentially a mixed gas. After the mixed gas enters the spray tower 4 through the raw material gas inlet 3, tap water is continuously supplied to the spray tower 4, and the spray pump 5 controls the spray tower 4 to achieve spray washing of the mixed gas, thereby removing some dust and impurities from the mixed gas, thus improving the purification effect of the mixed gas and laying the foundation for subsequent treatment. The collection and filtration module is responsible for collecting and further purifying the mixed gas after spray washing. The module includes a collection unit, a filtration unit, and a pressure stabilizing unit. The collection unit collects the mixed gas after spray washing and discharges any moisture it carries. One end of the filtration unit is connected to the collection unit, which is responsible for further filtering the collected mixed gas. The filtration unit includes a second pressure indicator 10 and two security filters 8. The security filters 8 perform fine filtration of the mixed gas, further removing residual dust particles after spray washing. The two security filters 8 operate in a one-in-one standby mode, ensuring continuous and stable system operation even if a single security filter 8 fails. The second pressure indicator 10 monitors the pressure of the active security filter 8. The other end of the filtration unit is connected to the pressure stabilizing unit, which maintains overall pressure stability during gas delivery, thereby improving the filtration accuracy of the mixed gas and the stability of system operation. The gas purification module 13 connects to the collection and filtration module and the spray module. The gas purification module 13 further purifies the filtered mixed gas to remove residual dust particles. At the same time, the gas purification module 13 monitors the purified mixed gas. If the purified mixed gas does not meet the requirements of the output gas, it is recycled and sent back to the spray module for spray washing again. This cycle ensures the recovery efficiency of nitrogen, thereby removing air components (such as oxygen) and avoiding the impact of changes in gas composition on the quality and safety of material conveying. It also ensures the purity of the output gas and improves the reliability of the pneumatic conveying system.

[0023] Understandably, the gas buffer module is connected to the gas purification module 13, and the gas buffer module is used to collect the mixed gas that meets the output gas requirements. The gas buffer tank 15 acts as a buffer to ensure the stability of the final nitrogen output. A third pressure indicator 14 is installed on the side wall of the gas buffer tank 15 to monitor the pressure of the gas buffer tank 15. The gas buffer tank 15 outputs pure nitrogen through the gas output port 19. All containers and pipes in contact with nitrogen in the entire system are made of carbon steel. Furthermore, by monitoring the gas composition of the gas buffer tank 15 through the monitoring module, the system can promptly detect any abnormalities in the gas buffer tank 15, thereby ensuring the quality of the nitrogen. The electrical control module 2 is electrically connected to the spray module, the collection and filtration module, the gas buffer module, and the monitoring module, realizing automated control of the entire system. The electrical control module 2 can adjust the working status in a timely manner according to the operating status of each module, thereby improving the automation level and reliability of the system operation.

[0024] In some embodiments of this application, the collection unit includes a pressure-stabilizing collection tank 6, a drain outlet 7, and a first pressure indicator 9. The first pressure indicator 9 is provided on the side wall of the pressure-stabilizing collection tank 6, and the drain outlet 7 is connected to the bottom of the pressure-stabilizing collection tank 6.

[0025] In some embodiments of this application, the voltage stabilizing unit includes a booster compressor 11 and a frequency converter 12, with the frequency converter 12 connected to the booster compressor 11.

[0026] Specifically, the collection unit consists of a pressure-stabilizing collection tank 6, a drain outlet 7, and a first pressure indicator 9. The pressure-stabilizing collection tank 6 is used to collect the gas after spray washing, achieving gas collection and preliminary pressure stabilization, laying the foundation for subsequent filtration. The first pressure indicator 9 is installed on the side wall of the pressure-stabilizing collection tank 6 to monitor the pressure inside, thereby promptly detecting pressure abnormalities and ensuring the safety and stability of the gas collection process. The bottom of the pressure-stabilizing collection tank 6 is connected to the drain outlet 7, which drains water from the tank, preventing water from entering the subsequent filtration unit and affecting the filtration effect of the security filter 8, while also extending the service life of the security filter 8. In cases where the raw material gas inlet 3 is connected to inert gas and mixed dust particles, if the mixed dust particles do not involve explosive dust, the spray module can be removed, and the raw material gas inlet 3 can be directly connected to the pressure-stabilizing collection tank 6. The booster compressor 11 of the pressure stabilizing unit is responsible for compressing the filtered gas to meet the pressure requirements of buffer delivery, while the frequency converter 12 precisely adjusts the rotation speed of the booster compressor 11, enabling the booster compressor 11 to maintain stable operation under different working conditions, thereby improving the system's recovery efficiency and reliability.

[0027] In some embodiments of this application, the gas purification module 13 is used to remove impurities from the gas output by the voltage regulator unit and to recycle and reuse the gas according to the removal results. When the gas after removal meets the nitrogen requirements, the gas after removal is sent to the gas buffer module. When the gas after removal does not meet the nitrogen requirements, the gas after removal is sent to the spray module for further spray washing.

[0028] Specifically, the gas purification module 13 is used to remove impurities from the gas output from the voltage regulator unit. When the purified gas meets the nitrogen requirements, it is sent to the gas buffer module. The nitrogen requirements refer to the nitrogen index (i.e., the required nitrogen purity) required by the final gas output port 19. When the purified gas meets the nitrogen requirements, that is, when the gas purification module 13 removes impurities from the gas output from the voltage regulator unit and the nitrogen purity meets the standard, the purified gas is sent to the gas buffer module to ensure the purity of the gas entering the gas buffer module. When the purified gas does not meet the nitrogen requirements, that is, when the gas purification module 13 removes impurities from the gas output from the voltage regulator unit and the nitrogen purity does not meet the standard, and there are still dust particles, it is sent to the spray module for further spray washing, which further improves the purification effect of the gas, ensures the efficiency and reliability of the system's nitrogen recovery, and improves the system's resource utilization rate.

[0029] In some embodiments of this application, the gas buffer module further includes a gas inlet 20, a pressure regulator 21, and a flow regulator 22. One end of the flow regulator 22 is connected to the gas inlet 20, and the other end of the flow regulator 22 is connected to the pressure regulator 21. The end of the pressure regulator 21 away from the flow regulator 22 is connected to the side wall of the gas buffer tank 15.

[0030] In some embodiments of this application, the monitoring module includes several monitoring units 16, a pressure-stabilizing collection tank 6, and a gas buffer tank 15 connected to the exhaust gas vent 1.

[0031] Specifically, the gas buffer module also includes a gas inlet 20, a pressure regulator 21, and a flow regulator 22. One end of the flow regulator 22 is connected to the gas inlet 20, which provides a channel for pure nitrogen to enter the system. The gas inlet 20 is used to replenish pure nitrogen to maintain the nitrogen concentration requirements of the gas outlet 19. The flow regulator 22 can precisely regulate the flow rate of the replenished pure nitrogen. The other end of the flow regulator 22 is connected to the pressure regulator 21, which further stabilizes the gas pressure of the input pure nitrogen based on the flow regulation, so that the pure nitrogen can stably enter the gas buffer tank 15. At the same time, combined with the buffering effect of the gas buffer tank 15 and the real-time monitoring of the third pressure indicator 14, it is ensured that the nitrogen output from the gas outlet 19 can meet the needs of pneumatic conveying. Furthermore, the monitoring module is responsible for monitoring the gas composition in the gas buffer tank 15. It comprises several monitoring units 16, the exact number of which is not limited. Each monitoring unit 16 can comprehensively monitor the gas composition from different dimensions, including but not limited to indicators such as oxygen content, moisture content, and VOCs. Through the coordinated monitoring of multiple monitoring units 16, the system can promptly and accurately detect abnormal conditions in the gas within the gas buffer tank 15. The pressure stabilizing collection tank 6 and the gas buffer tank 15 are connected to the exhaust gas vent 1, allowing the exhaust gas from both tanks to be released through the vent 1, further ensuring the efficiency of nitrogen recovery and improving the overall system's safety and stability.

[0032] See Figure 2 As shown, in some embodiments of this application, the electrical control module 2 includes a data acquisition and judgment unit and a processing and control unit. The data acquisition and judgment unit is configured to acquire the pressure of the stabilizing tank of the first pressure indicator 9 and the filter pressure of the second pressure indicator 10, determine whether to execute the switching strategy based on the pressure of the stabilizing tank and the filter pressure, and determine the target pressure of the stabilizing tank of the first pressure indicator 9. The processing and control unit is configured to determine the rotational speed of the booster 11 based on the target pressure of the stabilizing tank and the speed regulation model, determine the buffer tank pressure of the third pressure indicator 14 based on the rotational speed, determine whether to adjust the valve opening of the pressure regulator 21 based on the change in the buffer tank pressure, and adjust the valve opening of the pressure regulator 21 based on the change in the buffer tank pressure.

[0033] Specifically, the acquisition and judgment unit is used to accurately acquire the pressure of the stabilizing tank fed back by the first pressure indicator 9 and the filter pressure fed back by the second pressure indicator 10. These two pressure parameters directly reflect the gas storage status of the stabilizing collection tank 6 in the collection unit and the operating load of the security filter 8 in the filtration unit. After acquisition, the acquisition and judgment unit will comprehensively analyze these two pressure parameters to determine whether a switching strategy (switching the operating mode of the filtration unit) needs to be executed. Furthermore, based on whether the switching strategy is executed, it will further determine the target stabilizing tank pressure corresponding to the first pressure indicator 9, providing a data basis for subsequent pressure regulation. The processing and control unit uses the target stabilizing tank pressure as a benchmark and combines deep learning of the speed regulation model to accurately determine the required rotational speed of the booster compressor 11, ensuring that the booster compressor 11 can output appropriate power and provide stable support for gas transmission. As the rotational speed of the booster compressor 11 is determined, its compression effect on the gas directly affects the pressure inside the gas buffer tank 15. The real-time feedback of the buffer tank pressure from the third pressure indicator 14 is a direct result of the pressure in the gas buffer tank 15 after the rotational speed is determined. The processing control unit continuously monitors the changing trend of the buffer tank pressure, determines whether it is within the operating range satisfied by the system, and thus dynamically determines whether to adjust the valve opening of the pressure regulator 21. At the same time, it determines the appropriate adjustment range based on the specific change value of the buffer tank pressure, thereby precisely controlling the valve opening of the pressure regulator 21 to ensure the stability of the buffer tank pressure. The system achieves closed-loop control of the pressure, thereby ensuring the coordinated and efficient operation of each module.

[0034] In some embodiments of this application, when determining whether to execute a switching strategy and determining the target pressure of the first pressure indicator 9 based on the pressure of the pressure stabilizing tank and the pressure of the filter, the process includes: the acquisition and judgment unit acquiring the pressure difference between the filter pressure and the pressure of the pressure stabilizing tank, and comparing the pressure difference with a pressure difference threshold. When the pressure difference is greater than or equal to the pressure difference threshold, the switching strategy is determined to be executed, and the pressure of the first pressure indicator 9 after executing the switching strategy is determined as the target pressure of the pressure stabilizing tank. When the pressure difference is less than the pressure difference threshold, the switching strategy is determined not to be executed, and the current pressure of the pressure stabilizing tank is determined as the target pressure of the pressure stabilizing tank.

[0035] Specifically, when the acquisition and judgment unit determines whether to execute a switching strategy based on the pressure of the pressure stabilizing tank and the filter pressure, it first acquires the filter pressure (i.e., the operating pressure of the security filter 8 in the filter unit) fed back by the second pressure indicator 10 and the pressure of the pressure stabilizing tank (i.e., the gas pressure in the pressure-stabilizing collection tank 6 in the collection unit) fed back by the first pressure indicator 9. Based on these two real-time pressure values, it calculates the pressure difference between them. The pressure difference directly reflects the pressure change during the process of gas entering the security filter 8 from the pressure-stabilizing collection tank 6, and can intuitively indicate whether the security filter 8 is clogged with dust. The acquisition and judgment unit compares the obtained pressure difference with a pressure difference threshold. The pressure difference threshold can be experimentally determined based on factors such as the operating parameters of the security filter 8 and the gas delivery pressure. The pressure difference threshold is used to determine whether the security filter 8 needs to switch operating modes. When the pressure difference is greater than or equal to the pressure difference threshold, it indicates that the security filter 8 will experience excessive filtration resistance due to dust accumulation, thus affecting the filtration efficiency and system pressure stability. The acquisition and judgment unit then determines that a switching strategy needs to be executed. The switching strategy involves switching the active security filter 8 to the standby security filter 8 (the security filters 8 operate in a one-in-one-outstand mode) to ensure filtration stability. After executing the switching strategy, the pressure of the stabilizing tank displayed by the first pressure indicator 9 is determined as the target stabilizing tank pressure. When the pressure difference is less than the pressure difference threshold, it indicates that the security filter 8 is operating well and the filtration resistance is within the standard range. There is no need to switch the security filter 8. The acquisition and judgment unit then determines that the switching strategy should not be executed and determines the current pressure of the stabilizing tank displayed by the first pressure indicator 9 as the target stabilizing tank pressure, thereby ensuring the accuracy of the system in determining the target stabilizing tank pressure and providing a data benchmark for the subsequent control unit's regulation.

[0036] In some embodiments of this application, when determining the rotational speed of the booster 11 based on the target pressure tank pressure and the speed regulation model, the process includes: acquiring a set of operating parameters by a data acquisition and judgment unit, dividing the set of operating parameters into a training set and a test set according to a 4:1 ratio, searching for model parameters based on grid search and establishing a random forest model, training the random forest model based on the training set, substituting the test set into the trained random forest model to determine the accuracy, and determining the current trained random forest model as the speed regulation model when the accuracy is greater than or equal to the accuracy threshold; otherwise, adjusting the learning rate of the current trained random forest model and continuing training, and substituting the target pressure tank pressure into the speed regulation model to determine the rotational speed of the booster 11.

[0037] Specifically, the operating parameter set includes pressure and temperature data at the inlet and outlet of booster compressor 11, operating load data of booster compressor 11, motor current and voltage data of booster compressor 11, and historical pressure change data of the pressure stabilization collection tank 6, providing a data foundation for model construction. The data acquisition and judgment unit divides the operating parameter set into a training set and a test set in a 4:1 ratio. This ensures that the training set has sufficient data for model learning while reserving some data to verify the model's generalization ability, thus ensuring the model's performance level. Grid search can traverse parameter combinations to select the optimal parameter configuration. Based on this, a random forest model is built, providing a basic learning framework for subsequent speed prediction. The random forest model is trained using the training set, enabling the model to learn the correlation between parameters and gradually optimize, forming an understanding of the correspondence between the target pressure stabilization tank pressure and the booster compressor 11 speed. After training, the test set is substituted into the model to determine its accuracy. Accuracy is a key indicator of the model's predictive reliability, and the preferred accuracy threshold is 0.8. When the accuracy is greater than or equal to the accuracy threshold, it indicates that the model has stable predictive ability. At this point, the currently trained random forest model is determined as the speed regulation model. When the accuracy is not greater than or equal to the accuracy threshold, the learning rate of the model is adjusted using methods such as cosine annealing, and training continues. Adjusting the learning rate can optimize the model's convergence speed and fitting effect. The target pressure tank pressure is substituted into the determined speed regulation model. The model can output the corresponding rotational speed of the booster compressor 11 based on the learned rules, ensuring that the operating state of the booster compressor 11 is adapted to the target pressure tank pressure, providing precise power support for the system's pressure stability.

[0038] In some embodiments of this application, when determining whether to adjust the valve opening of the pressure regulator 21 based on the change in buffer tank pressure, and adjusting the valve opening of the pressure regulator 21 according to the change in buffer tank pressure, the process includes: the processing control unit acquiring historical buffer tank pressure change values ​​within a unit time and determining the historical average buffer tank pressure change value; if the change in buffer tank pressure within a unit time is greater than or equal to the historical average buffer tank pressure change value, then determining to adjust the valve opening of the pressure regulator 21; otherwise, not adjusting the valve opening of the pressure regulator 21; when determining to adjust the valve opening of the pressure regulator 21, acquiring the pressure difference between the change in buffer tank pressure and the historical average buffer tank pressure change value. A first pressure difference and a second pressure difference are preset. The first pressure difference is greater than the second pressure difference. When the pressure difference is greater than or equal to the first pressure difference, the valve opening of the pressure regulator 21 is adjusted according to the third valve coefficient. When the pressure difference is less than the first pressure difference but greater than the second pressure difference, the valve opening of the pressure regulator 21 is adjusted according to the second valve coefficient. When the pressure difference is less than or equal to the second pressure difference, the valve opening of the pressure regulator 21 is adjusted according to the first valve coefficient. The value range of the valve coefficient is: 1 < first valve coefficient < second valve coefficient < third valve coefficient. The valve opening of the pressure regulator 21 is directly proportional to the valve coefficient.

[0039] Specifically, the change in buffer tank pressure per unit time represents the difference between the buffer tank pressure at the previous moment and the current moment. By obtaining the historical buffer tank pressure change value per unit time and determining the average historical buffer tank pressure change, and by using statistical analysis of historical data to measure whether the current buffer tank pressure change is abnormal, the reliability of the pressure regulator 21 is ensured. If the change in buffer tank pressure per unit time is greater than or equal to the historical average buffer tank pressure change, it is determined that the valve opening of pressure regulator 21 should be adjusted. This indicates that the buffer tank pressure fluctuation exceeds the historical normal range and will affect the stability of gas output. The processing control unit then determines to adjust the valve opening of pressure regulator 21. If the change in buffer tank pressure per unit time is less than the historical average buffer tank pressure change, it indicates that the buffer tank pressure fluctuation does not exceed the historical normal range and will not affect the stability of gas output. In this case, it is determined not to adjust the valve opening of pressure regulator 21. If it is determined to adjust the valve opening of pressure regulator 21, the system calls the first and second pressure difference values ​​preset by the system for graded judgment. When the pressure difference is greater than or equal to the first pressure difference value, it indicates that the buffer tank pressure is dropping the fastest and a large amount of pure nitrogen needs to be added to maintain pressure balance. In this case, the largest third valve coefficient is used to adjust the valve opening of pressure regulator 21. The pressure regulator adjusts the valve opening of pressure regulator 21 as follows: when the pressure difference is less than the first pressure difference but greater than the second pressure difference, it indicates that the pressure drop rate of the buffer tank is moderate. In this case, a moderate second valve coefficient is used to adjust the valve opening of pressure regulator 21. When the pressure difference is less than or equal to the second pressure difference, it indicates that the pressure drop rate of the buffer tank is slowest. In this case, a minimum second valve coefficient is used to adjust the valve opening of pressure regulator 21. Furthermore, the valve opening is directly proportional to the valve coefficient. Assuming that the minimum second valve coefficient is used to adjust the valve opening Q of pressure regulator 21, the second valve coefficient is the determined valve coefficient K. The adjusted valve opening is determined to be Q*K, and the adjusted valve opening is less than one. When a larger valve opening is required, by establishing a direct proportional relationship between the valve opening and the valve coefficient, the stability of the valve opening adjustment of pressure regulator 21 is ensured, so that the pressure of gas buffer tank 15 can be stabilized within the range suitable for pneumatic conveying.

[0040] In the above embodiments, the spray tower and spray pump in the spray module work together to spray the recovered gas entering through the raw material gas inlet. The liquid adsorption removes some dust particles, reducing the load on subsequent filtration stages and optimizing the gas purification effect. The collection and filtration module achieves gas-liquid separation after spraying through a collection unit. Several security filters in the filtration unit perform deep filtration of the gas, further trapping residual dust to ensure nitrogen purity. A second pressure indicator monitors the working pressure of the security filters in real time, promptly identifying filter blockages and ensuring the continuous and stable operation of the filtration unit. The pressure stabilizing unit prevents pressure fluctuations from affecting subsequent processing. The gas purification module removes air components from the filtered gas, preventing the accumulation of oxygen and other components in the recovery cycle, ensuring the purity of the conveying medium nitrogen, and avoiding changes in composition that could affect material conveying quality and safety. The gas buffer tank is responsible for storing purified nitrogen. The third pressure indicator monitors the pressure inside the tank in real time, ensuring the stability of the gas pressure at the gas outlet and providing a stable medium supply for pneumatic conveying. The electrical control module is electrically connected to each module, realizing automated operation, thereby reducing manual intervention and improving the reliability and stability of the system operation.

[0041] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program goods according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A pneumatic conveying gas recovery system characterized by, The application relates to a nitrogen gas production device. The device comprises a spraying module connected with a raw gas inlet, the spraying module comprising a spraying tower and a spraying pump, the spraying tower being connected with the spraying pump; a collecting and filtering module connected with the spraying module, the collecting and filtering module comprising a collecting unit, a filtering unit and a pressure stabilizing unit, one end of the filtering unit being connected with the collecting unit, the other end of the filtering unit being connected with the pressure stabilizing unit, the filtering unit comprising a second pressure indicator and a plurality of safety filters, the second pressure indicator being connected with the plurality of safety filters; a gas purifying module connected with the collecting and filtering module and the spraying module; a gas buffering module connected with the gas purifying module, the gas buffering module comprising a third pressure indicator, a gas buffering tank and a gas outlet, the side wall of the gas buffering tank being provided with the third pressure indicator, the gas buffering tank being connected with the gas outlet; a monitoring module connected with the gas buffering module; and an electrical control module electrically connected with the spraying module, the collecting and filtering module, the gas buffering module and the monitoring module, the electrical control module being used for controlling the working states of the collecting and filtering module and the gas buffering module.

2. A pneumatic conveying gas recovery system according to claim 1, wherein, The collecting unit comprises a pressure stabilizing collecting tank, a drain outlet and a first pressure indicator, the side wall of the pressure stabilizing collecting tank being provided with the first pressure indicator, the bottom of the pressure stabilizing collecting tank being connected with the drain outlet.

3. A pneumatic conveying gas recovery system according to claim 2, wherein, The pressure stabilizing unit comprises a booster and a frequency converter, the frequency converter being connected with the booster.

4. A pneumatic conveying gas recovery system according to claim 3, wherein, The gas purifying module is used for removing impurities from the gas output by the pressure stabilizing unit, recycling the gas according to the removal result, and when the removed gas meets the nitrogen requirement, the removed gas is delivered to the gas buffering module, and when the removed gas does not meet the nitrogen requirement, the removed gas is delivered to the spraying module for further water washing.

5. A pneumatic conveying gas recovery system according to claim 4, wherein, The gas buffering module further comprises a gas inlet, a pressure regulator and a flow regulator, one end of the flow regulator being connected with the gas inlet, the other end of the flow regulator being connected with the pressure regulator, the end of the pressure regulator away from the flow regulator being connected with the side wall of the gas buffering tank.

6. A pneumatic conveying gas recovery system according to claim 5, wherein, The monitoring module comprises a plurality of monitoring units, the pressure stabilizing collecting tank and the gas buffering tank being connected with a waste gas vent.

7. A pneumatic conveying gas recovery system according to claim 6, wherein, The electrical control module comprises a collection and judgment unit and a processing and control unit. The collection and judgment unit is configured to collect the pressure of the pressure stabilizing tank of the first pressure indicator and the pressure of the filter of the second pressure indicator, judge whether to execute a switching strategy according to the pressure of the pressure stabilizing tank and the pressure of the filter, and determine the target pressure of the pressure stabilizing tank of the first pressure indicator. The processing and control unit is configured to determine the rotating speed of the booster based on the target pressure of the pressure stabilizing tank and a rotating speed adjusting model, determine the buffering tank pressure of the third pressure indicator based on the rotating speed, judge whether to adjust the valve opening degree of the pressure regulator according to the change of the buffering tank pressure, and adjust the valve opening degree of the pressure regulator according to the change value of the buffering tank pressure.

8. A pneumatic conveying gas recovery system according to claim 7, wherein, In the judgment of whether to execute the switching strategy according to the pressure of the surge tank and the pressure of the filter and the determination of the target pressure of the first pressure indicator of the surge tank, comprising: The acquisition judgment unit obtains the pressure difference between the filter pressure and the surge tank pressure, and compares the pressure difference with the pressure difference threshold value; When the pressure difference is greater than or equal to the pressure difference threshold value, it is determined that the switching strategy is executed, and the surge tank pressure of the first pressure indicator after executing the switching strategy is determined as the target surge tank pressure; when the pressure difference is less than the pressure difference threshold value, it is determined that the switching strategy is not executed, and the current surge tank pressure is determined as the target surge tank pressure.

9. A pneumatic conveying gas recovery system according to claim 8, wherein, In the determination of the rotational speed of the supercharger based on the target surge tank pressure and the rotational speed adjustment model, comprising: The acquisition judgment unit obtains a set of operating parameters, and divides the set of operating parameters into a training set and a test set according to a division ratio of 4:1, finds model parameters based on grid search, and establishes a random forest model, trains the random forest model according to the training set, and determines the accuracy rate by substituting the test set into the trained random forest model; When the accuracy rate is greater than or equal to the accuracy rate threshold value, the current trained random forest model is determined as the rotational speed adjustment model, otherwise, the learning rate of the current trained random forest model is adjusted and the training is continued; Substitute the target surge tank pressure into the rotational speed adjustment model to determine the rotational speed of the supercharger.

10. A pneumatic conveying gas recovery system according to claim 9, wherein, In the judgment of whether to adjust the valve opening of the pressure regulator according to the change of the buffer tank pressure, and the adjustment of the valve opening of the pressure regulator according to the change value of the buffer tank pressure, comprising: The processing control unit obtains the historical buffer tank pressure change value in a unit time and determines the historical buffer tank pressure change average value, when the change value of the buffer tank pressure in a unit time is greater than or equal to the historical buffer tank pressure change average value, it is determined that the valve opening of the pressure regulator is adjusted, otherwise, the valve opening of the pressure regulator is not adjusted; When it is determined to adjust the valve opening of the pressure regulator, the pressure difference value of the change value of the buffer tank pressure and the historical buffer tank pressure change average value is obtained; The first pressure difference value and the second pressure difference value are set in advance, and the first pressure difference value is greater than the second pressure difference value; When the pressure difference value is greater than or equal to the first pressure difference value, the valve opening of the pressure regulator is adjusted according to the third valve coefficient, when the pressure difference value is less than the first pressure difference value and greater than the second pressure difference value, the valve opening of the pressure regulator is adjusted according to the second valve coefficient, and when the pressure difference value is less than or equal to the second pressure difference value, the valve opening of the pressure regulator is adjusted according to the first valve coefficient, wherein the valve coefficient value range is: 1< first valve coefficient < second valve coefficient < third valve coefficient, and the valve opening of the pressure regulator is proportional to the valve coefficient.

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