Anti-blocking pipe operation control method and device for positive pressure dense phase pneumatic transportation process

Abstract

The present invention belongs to the technical field of material length measurement, and in particular, relates to a method and device for controlling the operation of an anti-blocking pipe in a positive pressure dense phase pneumatic conveying process. By introducing compressed air and feeding into the conveying pipeline of the conveying system, and then introducing a pulsed airflow into the conveying pipeline, so that the material forms a plug and flows, when the length of the plug exceeds the preset maximum value, the anti-blocking control logic module is started, that is, the pulse frequency of the pulse wind is increased, the conveying flow rate of the compressed air is increased, and the feeding rate of the conveying system is reduced in turn to adjust the length of the plug. In each of the above steps, the length of the plug is reduced to below the preset maximum value, and the anti-blocking control logic module is closed. If the effect cannot be achieved, an alarm is issued. Based on the precise control of the length of the plug, the problem of easy blockage in the embolic flow conveying process is effectively solved, the operating stability of the embolic flow pneumatic conveying system is improved, and the pulse frequency, conveying air volume, and feeding rate are controlled step by step, which has a significant energy-saving effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of material length measurement, specifically to the technical field of equipment for measuring the length of materials while they are moving using fluid characteristics, and in particular to a method and device for controlling the operation of an anti-blocking pipe in a positive pressure dense phase pneumatic transport process. Background Art

[0002] Dense phase plug flow conveying is an efficient material conveying method, which is widely used in coal, chemical, grain, building materials and other industries. The conveying system has a high solid-gas ratio and low gas consumption. During the conveying process, the material is transported in sections in the form of plugs in the pipeline. The pipeline will be blocked due to the excessive length of the plugs. Increasing the conveying gas flow can solve this problem, but it will cause interruptions in the conveying system and increase the energy consumption of the system.

[0003] Referring to the Chinese patent, publication number: CN116620866A, the name is a pneumatic conveying mechanism with anti-blocking function, which discloses a positive pressure pneumatic conveying system, which uses a corrugated fluctuating pipe to convey materials, and presets the blocking point at the trough of the fluctuating pipe. At the same time, the material conveying is segmented, and the air pressure sensor is used to detect the material conveying of each section through the air pressure change of the conveying system, quickly determine the section where the blockage may occur, and quickly blow away the deposited material, so as to achieve the prevention and control of the deposition blockage problem and self-maintenance. However, when the device is applied to the conveying of some viscous powders, the fluctuating pipe is not conducive to the stability of pipeline transportation, and solving the blockage problem only by increasing the air volume will increase the energy consumption of the system.

[0004] Therefore, it is urgent to design a method and device for controlling the operation of anti-blocking pipes in a positive pressure dense phase pneumatic transport process to solve the technical problems that the current anti-blocking measures are relatively single and the system energy consumption is too high.

[0005] It should be noted that the above information disclosed in this background technology section is only for understanding the background technology of the present application concept, and therefore, it may contain information that does not constitute the prior art. Summary of the invention

[0006] The embodiments of the present disclosure at least provide a method and device for controlling the operation of an anti-blocking pipe in a positive pressure dense phase pneumatic transport process.

[0007] In a first aspect, the present disclosure provides a method for controlling the operation of an anti-blocking pipe in a positive pressure dense phase pneumatic transport process, comprising the following steps:

[0008] Step S1, introducing compressed air into the conveying pipeline of the conveying system and feeding the material, and then introducing pulse airflow into the conveying pipeline to make the material form a plug and flow;

[0009] Step S2: When the plug is in a stable plug flow state in the delivery pipeline, the flow behavior of the plug is monitored and the actual length of the plug is calculated. ;

[0010] Step S3, if the actual length of the plug measured in step S2 is Greater than the preset maximum value , then start the anti-blocking control logic module and enter S4;

[0011] Step S4, increasing the pulse frequency of the pulse wind After the conveying system is in a stable state, monitor the flow behavior of the plug again and calculate the actual length of the plug If the actual length of the plug , the anti-blocking control logic module is closed. If the actual length of the plug is , it is determined that the conveying system needs further adjustment and the process goes to step S5;

[0012] Step S5, increasing the delivery flow of compressed air After the conveying system is in a stable state, monitor the flow behavior of the plug again and calculate the actual length of the plug If the actual length of the plug , the anti-blocking control logic module is closed. If the actual length of the plug is , it is determined that the conveying system needs further adjustment and the process goes to step S6;

[0013] Step S6, reducing the feed rate of the conveying system After the conveying system is in a stable state, monitor the flow behavior of the plug again and calculate the actual length of the plug If the actual length of the plug , the anti-blocking control logic module is closed. If the actual length of the plug is , the conveying system will sound an alarm and the equipment will stop running.

[0014] In an optional embodiment, the time from when the plug enters the monitoring range is recorded. and time of leaving the monitoring range , the actual length of the plug The calculation formula is as follows:

[0015] ;

[0016] In the formula, is the delivery flow rate of compressed air, is the speed of the plug in the delivery pipeline, is the velocity of the positive pressure airflow in the conveying duct, D is the diameter of the pipe, n is the reference coefficient of material rate and gas velocity,n The value range is 0.6-1.0.

[0017] In an optional embodiment, in step S4, the initial pulse frequency of the pulse wind is set to , the maximum pulse frequency of the pulse wind is ,when When the pulse frequency of the pulse wind is increased to ;

[0018] After the pulse frequency of the pulse wind is increased for the first time, if the actual length of the plug , the anti-blocking control logic module is closed. If the actual length of the plug is , then increase the pulse frequency of the pulse wind to ;

[0019] After increasing the pulse frequency of the pulse wind again, if the actual length of the plug , the anti-blocking control logic module is closed. If the actual length of the plug is , then increase the pulse frequency of the pulse wind to ;

[0020] like When the actual length of the plug is , then go to step S5.

[0021] In an optional embodiment, in step S5, the initial output flow rate of the compressed air is set to , the maximum flow rate of compressed air is ,when When the compressed air output flow rate is increased to ;

[0022] After increasing the output flow of compressed air for the first time, if the actual length of the plug , the anti-blocking control logic module is closed. If the actual length of the plug is , then increase the output flow of compressed air to ;

[0023] After increasing the output flow of compressed air again, if the actual length of the plug , the anti-blocking control logic module is closed. If the actual length of the plug is , then increase the pulse frequency of the pulse wind to ;

[0024] like When the actual length of the plug is , then go to step S6.

[0025] In an optional embodiment, in step S6, the initial feed rate of the conveying system is set to , minimum feed rate of the conveying system ,when When the feed rate of the conveying system is first reduced to ;

[0026] After reducing the feed rate of the conveying system for the first time, if the actual length of the plug , the anti-blocking control logic module is closed. If the actual length of the plug is , then reduce the feed rate of the conveying system again to ;

[0027] After increasing the output flow of compressed air again, if the actual length of the plug , the anti-blocking control logic module is closed. If the actual length of the plug is , then increase the pulse frequency of the pulse wind to ;

[0028] like When the actual length of the plug is , the conveying system sounds an alarm.

[0029] In an optional embodiment, in order to avoid plug failure, the plug has a preset maximum value. It should not be too small; at the same time, in order to avoid transportation blockage, the material plug is preset to the maximum value It should not be too large, and the value range is: .

[0030] In a second aspect, the embodiment of the present disclosure further provides a device for controlling the operation of an anti-blocking pipe in a positive pressure dense phase pneumatic transport process, which is applied to execute the method for controlling the operation of an anti-blocking pipe in a positive pressure dense phase pneumatic transport process as described above, wherein the device for controlling the operation of an anti-blocking pipe in a positive pressure dense phase pneumatic transport process comprises: a transport pipeline, wherein a pulse airflow device, an air source device and a feeding device are installed on the transport pipeline, wherein the pulse airflow device is suitable for spraying a pulse airflow into the transport pipeline, the air source device is suitable for conveying a positive pressure airflow into the transport pipeline, and the feeding device is suitable for conveying materials into the transport pipeline;

[0031] The control system, the pulse airflow device, the air source equipment and the feeding device are all electrically connected to the control system.

[0032] In an optional embodiment, the pulse airflow device includes a pulse air knife, a pulse solenoid valve, an air tank, an air compressor and a pulse controller, the pulse air knife is connected to the delivery pipeline, the pulse solenoid valve is connected to the pulse air knife, the air tank is connected to the pulse solenoid valve, the air compressor is connected to the air tank, and the pulse controller is connected to the pulse solenoid valve;

[0033] Furthermore, the pulse solenoid valve is electrically connected to the control system.

[0034] In an optional embodiment, the air source device includes a compressed air system and a vortex flowmeter, the compressed air system is suitable for outputting a compressed air flow, and the vortex flowmeter is arranged between the compressed air system and the delivery pipeline to detect the output flow of the compressed air system;

[0035] And, the compressed air system is electrically connected to the control system.

[0036] In an optional embodiment, the feeding device includes a silo, a rotary feeding valve and a feeding tank, the discharge port of the silo is connected to the feed port of the feeding tank, and the discharge port of the feeding tank is connected to the conveying pipeline;

[0037] The rotary feeding valve is arranged between the silo and the feeding tank;

[0038] Furthermore, the rotary feeding valve is electrically connected to the control system.

[0039] The beneficial effect of the present invention is that the present invention monitors the length of the material plug in the pipeline by setting a material monitoring sensor, and the anti-blocking control logic regulates the relevant equipment according to the measured length of the material plug, which can achieve the following effects:

[0040] 1. Based on the precise control of the plug length, the problem of easy blockage in the plug flow transportation process is effectively solved, and the operating stability of the plug flow pneumatic conveying system is improved.

[0041] 2. This method regulates the pulse frequency, conveying air volume and feeding rate step by step according to the control logic, accurately controls the length of the material plug, and has a significant energy-saving effect.

[0042] Other features and advantages of the present invention will be described in the following description or understood through implementation of the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0043] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1A flow chart of a method for controlling the operation of an anti-blocking pipe in a positive pressure dense phase pneumatic transport process provided by an embodiment of the present disclosure;

[0046] Figure 2 A schematic structural diagram of a device for controlling pipe operation to prevent blockage in a positive pressure dense phase pneumatic transport process provided in an embodiment of the present disclosure.

[0047] In the figure:

[0048] 1. Compressed air system; 2. Vortex flowmeter; 3. Rotary feed valve; 4. Feed tank; 5. Pulse air knife; 6. Pulse solenoid valve; 7. Pulse controller; 8. Air storage tank; 9. Air compressor; 10. Material monitoring sensor; 11. Material plug; 12. Delivery pipeline; 13. Control system;

[0049] C1, first control logic unit; C2, second control logic unit; C3, third control logic unit. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are 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.

[0051] According to research, during the transportation process, the material is transported in sections in the form of plugs 11 in the pipeline, and the pipeline may be blocked due to the excessive length of the plugs 11. Increasing the air flow can solve this problem, but it will lead to interruptions in the transportation system and increase the energy consumption of the system. Solving the blockage problem only by increasing the air volume will increase the energy consumption of the system, and the current anti-blockage measures are relatively simple.

[0052] The defects existing in the above solutions are the results obtained by the inventor after practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed by the present disclosure for the above problems below should be the contributions made by the inventor to the present disclosure during the disclosure process.

[0053] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0054] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0055] Based on the above research, the present disclosure provides a method for controlling the operation of an anti-blocking pipe in a positive pressure dense phase pneumatic transport process. Figure 1 The anti-blocking pipe operation control method of the positive pressure dense phase pneumatic conveying process delivers positive pressure compressed air to the conveying pipe 12 of the conveying system and feeds the material so that the material forms a plug 11 and then drives the material to flow along the conveying pipe 12. After monitoring that the length of the plug 11 is too long, the anti-blocking control logic module is turned on, that is, the pulse frequency of the pulse wind in the conveying pipe 12 is adjusted in turn. , compressed air delivery flow and feed rate , so as to reduce the length of the plug 11, thereby ensuring that the conveying pipeline 12 will not be blocked. The anti-blocking pipe operation control method of the positive pressure dense phase pneumatic conveying process specifically includes the following steps:

[0056] Step S1, introducing compressed air into the conveying pipe 12 of the conveying system and feeding the material, and then introducing pulse airflow into the conveying pipe 12 to make the material form a plug 11 and flow;

[0057] Step S2: When the plug 11 is in a stable plug flow state in the delivery pipe 12, the flow behavior of the plug 11 is monitored and the actual length of the plug 11 is calculated. ;

[0058] Step S3, if the actual length of the plug 11 measured in step S2 is Greater than the preset maximum value , then start the anti-blocking control logic module and enter S4;

[0059] Step S4, increasing the pulse frequency of the pulse wind After the conveying system is in a stable state, the flow behavior of the plug 11 is monitored again, and the actual length of the plug 11 is calculated. If the actual length of the plug 11 is , then the anti-blocking control logic module is closed, if the actual length of the plug 11 , it is determined that the conveying system needs further adjustment and the process goes to step S5;

[0060] Step S5, increasing the delivery flow of compressed air After the conveying system is in a stable state, the flow behavior of the plug 11 is monitored again, and the actual length of the plug 11 is calculated. If the actual length of the plug 11 is , then the anti-blocking control logic module is closed, if the actual length of the plug 11 , it is determined that the conveying system needs further adjustment and the process goes to step S6;

[0061] Step S6, reducing the feed rate of the conveying system After the conveying system is in a stable state, the flow behavior of the plug 11 is monitored again, and the actual length of the plug 11 is calculated. If the actual length of the plug 11 is , then the anti-blocking control logic module is closed, if the actual length of the plug 11 , the conveying system will sound an alarm and the equipment will stop running.

[0062] In at least one embodiment, the actual length of the plug 11 is calculated The method is to record the time from when the plug 11 enters the monitoring range and time of leaving the monitoring range , the actual length of the plug 11 The calculation formula is as follows:

[0063] ;

[0064] In the formula, is the delivery flow rate of compressed air, is the speed of the plug 11 in the delivery pipeline 12, is the velocity of the positive pressure airflow in the delivery pipe 12, D is the diameter of the pipe, n is the reference coefficient of material rate and gas velocity, n The value range is 0.6-1.0.

[0065] In at least one embodiment, in step S4, the initial pulse frequency of the pulse wind is set to , the maximum pulse frequency of the pulse wind is ,when When the pulse frequency of the pulse wind is increased to ;

[0066] After the pulse frequency of the pulse wind is increased for the first time, if the actual length of the plug 11 , then the anti-blocking control logic module is closed, if the actual length of the plug 11 , then increase the pulse frequency of the pulse wind to ;

[0067] After increasing the pulse frequency of the pulse wind again, if the actual length of the plug 11 , then the anti-blocking control logic module is closed, if the actual length of the plug 11 , then increase the pulse frequency of the pulse wind to ;

[0068] like When the actual length of the plug 11 is , then go to step S5.

[0069] In at least one embodiment, in step S5, the initial output flow rate of the compressed air is set to , the maximum flow rate of compressed air is ,when When the compressed air output flow rate is increased to ;

[0070] After the output flow of compressed air is increased for the first time, if the actual length of the plug 11 , then the anti-blocking control logic module is closed, if the actual length of the plug 11 , then increase the output flow of compressed air to ;

[0071] After increasing the output flow of compressed air again, if the actual length of the plug 11 , then the anti-blocking control logic module is closed, if the actual length of the plug 11 , then increase the pulse frequency of the pulse wind to ;

[0072] like When the actual length of the plug 11 is , then go to step S6.

[0073] In at least one embodiment, in step S6, the initial feed rate of the conveying system is set to , minimum feed rate of the conveying system ,when When the feed rate of the conveying system is first reduced to ;

[0074] After the feed rate of the conveying system is reduced for the first time, if the actual length of the plug 11 , then the anti-blocking control logic module is closed, if the actual length of the plug 11 , then reduce the feed rate of the conveying system again to ;

[0075] After increasing the output flow of compressed air again, if the actual length of the plug 11 , then the anti-blocking control logic module is closed, if the actual length of the plug 11 , then increase the pulse frequency of the pulse wind to ;

[0076] like When the actual length of the plug 11 is , the conveying system sounds an alarm.

[0077] In at least one embodiment, the plug 11 has a preset maximum value The length range is: , the material plug preset maximum value It should not be too small to avoid failure of plug formation; at the same time, the plug preset maximum value It should not be too large to avoid transportation blockage.

[0078] In addition, refer to Figure 2 The disclosed embodiment also provides a device for controlling the operation of an anti-blocking pipe in a positive pressure dense phase pneumatic transport process, which is used to execute the method for controlling the operation of an anti-blocking pipe in a positive pressure dense phase pneumatic transport process described above. The device for controlling the operation of an anti-blocking pipe in a positive pressure dense phase pneumatic transport process includes: a conveying pipeline 12, the interior of which is suitable for the circulation of materials and air. A pulse airflow device, an air source device and a feeding device are installed on the conveying pipeline 12. The air source device is located at one end of the conveying pipeline 12 and is capable of conveying positive pressure compressed air into the conveying pipeline 12. The feeding device and the pulse airflow device are both located on the side of the conveying pipeline 12 close to the air source device, and the feeding device and the pulse airflow device are arranged in sequence in a direction away from the air source device. The pulse airflow device is suitable for spraying pulse airflow into the conveying pipeline 12, the air source device is suitable for conveying positive pressure airflow into the conveying pipeline 12, and the feeding device is suitable for conveying materials into the conveying pipeline 12. At the same time, the device for controlling the operation of the anti-blocking pipe in the positive pressure dense phase pneumatic transport process also includes a control system 13, and the pulse airflow device, the air source equipment and the feeding device are all electrically connected to the control system 13. The control system 13 can be further divided into a first control logic unit C1, a second control logic unit C2 and a third control logic unit C3. The first control logic unit C1 is electrically connected to the pulse airflow device so that the first control logic unit C1 can control and adjust the pulse wind frequency of the pulse airflow device The second control logic unit C2 is electrically connected to the air source device so that the second control logic unit C2 can control and adjust the compressed air flow of the air source device. The third control logic unit C3 is electrically connected to the feeding device so that the third control logic unit C3 can control and adjust the feeding rate of the feeding device. In addition, the device for controlling the operation of the anti-blocking pipe in the positive pressure dense phase pneumatic conveying process also includes a material monitoring sensor 10, which is also electrically connected to the control system 13. The material monitoring sensor 10 can record and feedback to the control system 13 the time when the material plug 11 enters and leaves the monitoring range of the material monitoring sensor 10. and , combined with the above formula, is used to calculate the actual length of the plug 11 .

[0079] Reference Figure 2In at least one embodiment, the pulse airflow device includes a pulse air knife 5, a pulse solenoid valve 6, an air tank 8, an air compressor 9 and a pulse controller 7. The air compressor 9, the air tank 8, the pulse solenoid valve 6 and the pulse air knife 5 are connected in sequence. The output end of the pulse air knife 5 faces the inside of the delivery pipeline 12. The air compressor 9 is suitable for compressing air and storing it in the air tank 8. The first control logic unit C1 can control the pulse solenoid valve 6 to adjust the opening size of the air tank 8 and the pulse air knife 5, thereby adjusting the pulse wind frequency. .

[0080] Reference Figure 2 In at least one embodiment, the air source device includes a compressed air system 1 and a vortex flowmeter 2. The compressed air system 1 is suitable for outputting a compressed air flow. The vortex flowmeter 2 is arranged between the compressed air system 1 and the delivery pipeline 12. The vortex flowmeter 2 is electrically connected to the control system 13 to detect and feed back the output flow of the compressed air system 1 to the control system 13. The second control logic unit C2 can control the compressed air system 1 to adjust the output compressed air flow. .

[0081] Reference Figure 2 In at least one embodiment, the feeding device includes a silo, a rotary feeding valve 3 and a feeding tank 4, the discharge port of the silo is connected to the feed port of the feeding tank 4, and the discharge port of the feeding tank 4 is connected to the conveying pipeline 12. The rotary feeding valve 3 is arranged between the silo and the feeding tank 4, and the third control logic unit C3 can control the rotary feeding valve 3 to adjust the opening size between the silo and the feeding tank 4, thereby adjusting the feeding rate of the feeding device .

[0082] In summary, the specific process of the device for controlling the operation of the anti-blocking pipe in the positive pressure dense phase pneumatic conveying process and the method for controlling the operation of the anti-blocking pipe in the positive pressure dense phase pneumatic conveying process is as follows:

[0083] A1, set the volume flow reading of vortex flowmeter 2 to , set the diameter of the delivery pipeline 12 to D And assign a value, set the preset maximum value of the setting plug 11 of the control system 13 And assign values, where ;

[0084] A2, when the delivery pipeline presents a stable plug flow, the control system 13 monitors the time when the plug 11 passing through the delivery pipe enters and leaves the material monitoring sensor 10 , Record and calculate the actual length of the plug 11 , the specific calculation formula is as follows: ;

[0085] A3, Judgment and If , then the anti-blocking control logic is triggered and the process goes to A4, otherwise it goes to A8;

[0086] A4, set the initial pulse frequency of the pulse wind to , the maximum pulse frequency of the pulse wind is ,when When the pulse frequency of the pulse wind is increased to ;

[0087] After the pulse frequency of the pulse wind is increased for the first time, if the actual length of the plug 11 , then enter A8, if the actual length of the plug 11 , then increase the pulse frequency of the pulse wind to ;

[0088] After increasing the pulse frequency of the pulse wind again, if the actual length of the plug 11 , then enter A8, if the actual length of the plug 11 , then increase the pulse frequency of the pulse wind to ;

[0089] like When the actual length of the plug 11 is , then go to step A5;

[0090] A5, set the initial output flow of compressed air to , the maximum flow rate of compressed air is ,when When the compressed air output flow rate is increased to ;

[0091] After the output flow of compressed air is increased for the first time, if the actual length of the plug 11 , then enter A8, if the actual length of the plug 11 , then increase the output flow of compressed air to ;

[0092] After increasing the output flow of compressed air again, if the actual length of the plug 11 , then enter A8, if the actual length of the plug 11 , then increase the pulse frequency of the pulse wind to ;

[0093] like When the actual length of the plug 11 is , then go to step A6;

[0094] A6, set the initial feed rate of the conveying system to , minimum feed rate of the conveying system ,when When the feed rate of the conveying system is first reduced to ;

[0095] After the feed rate of the conveying system is reduced for the first time, if the actual length of the plug 11 , then enter A8, if the actual length of the plug 11 , then reduce the feed rate of the conveying system again to ;

[0096] After increasing the output flow of compressed air again, if the actual length of the plug 11 , then enter A8, if the actual length of the plug 11 , then increase the pulse frequency of the pulse wind to ;

[0097] like When the actual length of the plug 11 is , then enter A7;

[0098] A7, anti-blocking control logic fails to , the control system 13 turns off the pulse controller 7, the compressed air system 1, the rotary feed valve 3 and sounds an alarm, the system stops running, and enters A9;

[0099] A8, anti-blocking control logic is closed, the conveying system operates normally, and enters A9;

[0100] A9, the process ends.

[0101] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Inspired by the above-mentioned ideal embodiments of the present invention and through the above-mentioned description, relevant staff can make various changes and modifications without departing from the technical idea of ​​the present invention. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A method for controlling the operation of an anti-blocking pipe in a positive pressure dense phase pneumatic transport process, characterized in that: The steps include: Step S1, introducing compressed air into a conveying pipe (12) of a conveying system and feeding the material, and then introducing a pulsed airflow into the conveying pipe (12) so that the material forms a plug (11) and flows; Step S2, when the plug (11) is in a stable plug flow state in the delivery pipeline (12), the flow behavior of the plug (11) is monitored and the actual length of the plug (11) is calculated. l ; Step S3, if the actual length of the plug (11) measured in step S2 is l Greater than the preset maximum value of the plug (11) l max , then start the anti-blocking control logic module and enter S4; Step S4, increasing the pulse frequency of the pulse wind f After the conveying system is in a stable state, the flow behavior of the plug (11) is monitored again, and the actual length of the plug (11) is calculated. l If the actual length of the plug (11) l ≦ l max , the anti-blocking control logic module is closed. If the actual length of the plug (11) l > l max , it is determined that the conveying system needs further adjustment and the process goes to step S5; Step S5, increasing the delivery flow of compressed air Q v After the conveying system is in a stable state, the flow behavior of the plug (11) is monitored again, and the actual length of the plug (11) is calculated. l If the actual length of the plug (11) l ≦ l max , the anti-blocking control logic module is closed. If the actual length of the plug (11) l > l max , it is determined that the conveying system needs further adjustment and the process goes to step S6; Step S6, reducing the feed rate of the conveying system G After the conveying system is in a stable state, the flow behavior of the plug (11) is monitored again, and the actual length of the plug (11) is calculated. l If the actual length of the plug (11) l ≦ l max , the anti-blocking control logic module is closed. If the actual length of the plug (11) l > l max , the conveying system will sound an alarm and the equipment will stop running.

2. The anti-blocking pipe operation control method for positive pressure dense phase pneumatic transportation process according to claim 1 is characterized in that: Record the time when the plug (11) enters the monitoring range t 1 and the time of leaving the monitoring range t 2. Actual length of the plug (11) l The calculation formula is as follows: ； In the formula, Q v is the delivery flow rate of compressed air, v s is the speed of the plug (11) in the delivery pipe (12), v g is the velocity of the positive pressure airflow in the delivery pipe (12), D is the diameter of the pipe, n is the reference coefficient of material rate and gas velocity, n The value range is 0.6-1.

0.

3. The anti-blocking pipe operation control method for positive pressure dense phase pneumatic transportation process according to claim 1 is characterized in that: In step S4, the initial pulse frequency of the pulse wind is set to f 1. The maximum pulse frequency of pulse wind is f max ,when l > l max When the pulse frequency of the pulse wind is increased to ; After the pulse frequency of the pulse wind is increased for the first time, if the actual length of the plug (11) l ≦ l max , the anti-blocking control logic module is closed. If the actual length of the plug (11) l > l max , then increase the pulse frequency of the pulse wind to ; After the pulse frequency of the pulse wind is increased again, if the actual length of the plug (11) l ≦ l max , the anti-blocking control logic module is closed. If the actual length of the plug (11) l > l max , then increase the pulse frequency of the pulse wind to f = f max ; like f = f max When the actual length of the plug (11) is l > l max , then go to step S5.

4. The anti-blocking pipe operation control method for positive pressure dense phase pneumatic transportation process according to claim 1 is characterized in that: In step S5, the initial output flow rate of compressed air is set to Q v1 , the maximum flow rate of compressed air is Q vmax ,when l > l max When the compressed air output flow rate is increased to ; After the compressed air output flow rate is increased for the first time, if the actual length of the plug (11) l ≦ l max , the anti-blocking control logic module is closed. If the actual length of the plug (11) l > l max , then increase the output flow of compressed air to ; After increasing the output flow of compressed air again, if the actual length of the plug (11) l ≦ l max , the anti-blocking control logic module is closed. If the actual length of the plug (11) l > l max , then increase the pulse frequency of the pulse wind to Q v = Q vmax ; like Q v = Q vmax When the actual length of the plug (11) is l > l max , then go to step S6.

5. The anti-blocking pipe operation control method for positive pressure dense phase pneumatic transportation process according to claim 1 is characterized in that: In step S6, the initial feed rate of the conveying system is set to G 1. Minimum feed rate of the conveying system G min ,when l > l max When the feed rate of the conveying system is first reduced to ; After the feed rate of the conveying system is reduced for the first time, if the actual length of the plug (11) l ≦ l max , the anti-blocking control logic module is closed. If the actual length of the plug (11) l > l max , then reduce the feed rate of the conveying system again to ; After reducing the feeding rate of the conveying system again, if the actual length of the plug (11) l ≦ l max , the anti-blocking control logic module is closed. If the actual length of the plug (11) l > l max , then reduce the feed rate of the conveying system to G = G min ; like G = G min When the actual length of the plug (11) is l > l max , the conveying system sounds an alarm.

6. The anti-blocking pipe operation control method for positive pressure dense phase pneumatic transportation process according to claim 1 is characterized in that: The plug preset maximum value l max As the anti-blocking control benchmark parameter, its value range is: 5 D ≤ l max ≤20 D , D The diameter of the pipe.

7. A device for controlling the operation of a pipe to prevent blockage in a positive pressure dense phase pneumatic transport process, characterized in that: The method for controlling the operation of an anti-blocking pipe in a positive pressure dense phase pneumatic transport process according to any one of claims 1 to 6 is applied, wherein the device for controlling the operation of an anti-blocking pipe in a positive pressure dense phase pneumatic transport process comprises: a conveying pipeline (12), wherein a pulse airflow device, an air source device and a feeding device are installed on the conveying pipeline (12), the pulse airflow device is suitable for spraying a pulse airflow into the conveying pipeline (12), the air source device is suitable for conveying a positive pressure airflow into the conveying pipeline (12), and the feeding device is suitable for conveying materials into the conveying pipeline (12); A control system (13), wherein the pulse airflow device, the air source device and the feeding device are all electrically connected to the control system (13).

8. The device for controlling the operation of a pipe to prevent blockage in a positive pressure dense phase pneumatic transport process according to claim 7, characterized in that: The pulse airflow device comprises a pulse air knife (5), a pulse solenoid valve (6), an air storage tank (8), an air compressor (9) and a pulse controller (7); the pulse air knife (5) is connected to a delivery pipeline (12); the pulse solenoid valve (6) is connected to the pulse air knife (5); the air storage tank (8) is connected to the pulse solenoid valve (6); the air compressor (9) is connected to the air storage tank (8); and the pulse controller (7) is connected to the pulse solenoid valve (6); Furthermore, the pulse solenoid valve (6) is electrically connected to the control system (13).

9. The device for controlling the operation of a pipe to prevent blockage in a positive pressure dense phase pneumatic transport process according to claim 7, characterized in that: The air source equipment comprises a compressed air system (1) and a vortex flowmeter (2); the compressed air system (1) is suitable for outputting a compressed air flow; the vortex flowmeter (2) is arranged between the compressed air system (1) and the delivery pipeline (12) to detect the output flow of the compressed air system (1); Furthermore, the compressed air system (1) is electrically connected to the control system (13).

10. The device for controlling the operation of a pipe to prevent blockage in a positive pressure dense phase pneumatic transport process according to claim 7, characterized in that: The feeding device comprises a silo, a rotary feeding valve (3) and a feeding tank (4), the discharge port of the silo is connected to the feed port of the feeding tank (4), and the discharge port of the feeding tank (4) is connected to a conveying pipeline (12); The rotary feed valve (3) is arranged between the material bin and the material delivery tank (4); Furthermore, the rotary feeding valve (3) is electrically connected to the control system (13).

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