CN111377243B - Pneumatic conveying system and control method thereof - Google Patents
Pneumatic conveying system and control method thereof Download PDFInfo
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- CN111377243B CN111377243B CN202010482186.4A CN202010482186A CN111377243B CN 111377243 B CN111377243 B CN 111377243B CN 202010482186 A CN202010482186 A CN 202010482186A CN 111377243 B CN111377243 B CN 111377243B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/04—Conveying materials in bulk pneumatically through pipes or tubes; Air slides
- B65G53/16—Gas pressure systems operating with fluidisation of the materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/52—Adaptations of pipes or tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/66—Use of indicator or control devices, e.g. for controlling gas pressure, for controlling proportions of material and gas, for indicating or preventing jamming of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
- B65G2201/04—Bulk
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Abstract
The invention discloses a pneumatic transmission system, comprising: the system comprises a main conveying pipe, a branch conveying pipe connected with the main conveying pipe and a constant pressure control system, wherein the constant pressure control system comprises a magnetic suspension blower, a frequency converter and a controller; the frequency converter is connected with the magnetic suspension blower and is used for adjusting the rotating speed of the magnetic suspension blower; the conveying branch pipe is provided with a rotary valve for adjusting the air flow of the conveying branch pipe; the controller is set to control the rotary opening of the rotary valve and the driving frequency of the frequency converter, and the controller controls the driving frequency of the frequency converter according to the real-time pressure of the main conveying pipe so as to adjust the rotating speed of the magnetic suspension blower and further maintain the pressure in the main conveying pipe to be constant. The controller controls the rotary opening degree of the rotary valve according to the real-time pressure of the conveying branch pipe so as to maintain the pressure in the conveying branch pipe to be constant. The utility model provides a pneumatic conveying system is with a magnetic suspension air-blower for many pipeline air supplies simultaneously, and can satisfy the operating mode pressure demand of many pipelines simultaneously.
Description
Technical Field
The invention relates to the technical field of pneumatic transmission, in particular to a pneumatic transmission system and a control method thereof.
Background
The pneumatic conveying method is mainly adopted for conveying raw materials into a homogenizing silo in a novel dry-process cement plant at present, the pneumatic conveying in the homogenizing silo is not only used for conveying the raw materials into the homogenizing silo, but also used for stirring air in the homogenizing silo, and the pneumatic conveying is mainly embodied in a large silo outer ring, a large silo inner ring and a small silo in the homogenizing silo.
At present, the pneumatic transmission of a homogenization silo in a plurality of cement manufacturing industries still adopts three roots fans to respectively carry out pneumatic transmission on each pneumatic transmission pipeline, the roots fans work in a mechanical transmission mode, the efficiency is low, a frequency conversion technology is not adopted, the pressure of certain pneumatic transmission pipelines is overhigh, and a user can only adopt a bypass valve pressure relief working mode to maintain the normal work of the pneumatic transmission pipelines, so that the energy waste is caused.
Disclosure of Invention
In order to solve the technical problem, the invention provides a pneumatic transmission system and a control method thereof.
According to an aspect of the present application, there is provided a pneumatic conveying system comprising: the constant-pressure control system comprises a magnetic suspension air blower arranged at one end of the main conveying pipe, a frequency converter connected with the magnetic suspension air blower and a controller connected with the frequency converter; the frequency converter is connected with the magnetic suspension blower and is used for adjusting the rotating speed of the magnetic suspension blower; the conveying branch pipe is provided with a rotary valve for adjusting the air flow of the conveying branch pipe; the controller is arranged to control the rotary opening of the rotary valve and the driving frequency of the frequency converter; the controller controls the driving frequency of the frequency converter according to the real-time pressure of the main conveying pipe so as to adjust the rotating speed of the magnetic suspension blower and further maintain the pressure in the main conveying pipe to be constant; the controller controls the rotary opening degree of the rotary valve according to the real-time pressure of the conveying branch pipe so as to maintain the pressure in the conveying branch pipe to be constant.
Optionally, a main pipe pressure sensor is arranged in the conveying main pipe; a branch pipe pressure sensor is arranged in the conveying branch pipe; the controller is respectively in data connection with the main pipe pressure sensor and the branch pipe pressure sensor to acquire the real-time pressure of the main conveying pipe and the real-time pressure of the branch conveying pipe.
Alternatively, the main pipe pressure sensor is arranged at the air outlet of the magnetic suspension blower, and the branch pipe pressure sensor is arranged at the outlet of the conveying branch pipe.
Optionally, the system further comprises a central control system in communication connection with the constant voltage control system, and the central control system is used for remotely controlling the constant voltage control system.
According to another aspect of the application, a control method of a pneumatic conveying system is provided, which comprises the following main pipe pressure control method and branch pipe pressure control method. The main pipe pressure control method comprises the following steps: s101, setting a preset pressure value of the main conveying pipe through a controller. S102, the controller compares the real-time pressure of the main conveying pipe with a preset pressure value of the main conveying pipe, and when the real-time pressure of the main conveying pipe is different from the preset pressure value of the main conveying pipe, the step S103 is carried out. S103, the controller adjusts the driving frequency change of the frequency converter, and then adjusts the rotating speed of the magnetic suspension blower so as to adjust the air pressure in the main conveying pipe to the preset pressure value of the main conveying pipe. The branch pipe pressure control method includes: s201, a controller is used for setting a preset pressure value of the conveying branch pipe. S202, the controller compares the acquired real-time pressure of the conveying branch pipe with a preset pressure value of the conveying branch pipe, and if the real-time pressure of the conveying branch pipe is different from the preset pressure value of the conveying branch pipe, the step S203 is carried out. S203, the controller adjusts the opening of the rotary valve so as to adjust the gas flow in the conveying branch pipe to adjust the gas pressure in the conveying branch pipe to a preset pressure value; wherein the main pipe pressure control method and the branch pipe pressure control method are performed simultaneously.
Optionally, in step S203 of the branch pipe pressure control method, the controller adjusts the opening degree of the rotary valve according to a real-time pressure difference e (t) between the real-time pressure of the conveying branch pipe and a preset pressure value of the conveying branch pipe, and the controller controls the rotary opening degree of the rotary valve according to the real-time pressure difference e (t) according to the following:
wherein e (t) is the pressure difference between the preset pressure values of the branch conveying pipe and the branch conveying pipe, and u (t) is the current valve opening value of the rotary valve.
Optionally, a supervisor pressure supervision method is also included. The supervisor pressure supervision method comprises the following steps: s301, comparing the real-time pressure of the main conveying pipe with the real-time pressure of the branch conveying pipe by the controller, and entering S302 when the real-time pressure of the main conveying pipe is lower than the real-time pressure of the branch conveying pipe; s302, the controller controls the driving frequency of the frequency converter to adjust the rotating speed of the magnetic suspension blower, and the air pressure in the conveying main pipe is adjusted to be higher than the air pressure in the conveying branch pipe.
Optionally, when the real-time pressure of the main delivery pipe is lower than the real-time pressure of the branch delivery pipe in step S301, the main pipe pressure monitoring method further includes step S303. S303, comparing the real-time pressure of the main conveying pipe with the preset pressure value of the branch conveying pipe; step S302 is carried out when the real-time pressure of the main conveying pipe is higher than the preset pressure value of the branch conveying pipe; and when the real-time pressure of the main conveying pipe is lower than the preset pressure value of the branch conveying pipe, the step S304 is carried out. S304, the controller changes the preset pressure value of the main conveying pipe according to the preset pressure value of the main conveying pipe, then controls the driving frequency of the frequency converter according to the changed preset pressure value of the main conveying pipe, and adjusts the air pressure in the main conveying pipe to be higher than the air pressure in the main conveying pipe.
Optionally, when the real-time pressure of the main delivery pipe is lower than the preset pressure value of the branch delivery pipe in step S304, the controller changes the preset pressure value of the main delivery pipe according to the following criteria:
Pmain pipeline=PBranch pipe+10kPa。
Optionally, when there are a plurality of delivery branch pipes, the basis for changing the preset pressure value of the delivery main pipe is as follows:
Pmain pipeline=MAX(PBranch pipe)+10kPa，MAX(PBranch pipe) The largest one of the preset pressure values in all the conveying branch pipes is adopted.
The utility model provides a pneumatic conveying system is many pneumatic conveying pipeline air supplies simultaneously through a magnetic suspension air-blower, and can accomplish the pressure homoenergetic of many pipelines and satisfy in operating mode pressure demand, reduction in production cost improves production efficiency.
The pneumatic conveying system uses a magnetic suspension air blower to supply air for a plurality of pneumatic conveying pipelines simultaneously instead of the existing pneumatic conveying system, and adopts a plurality of air supplies to supply air to each conveying pipeline respectively, so that the equipment failure rate is reduced, and the production loss caused by equipment failure is reduced.
The internal pressure homoenergetic of the main conveying pipe and the branch conveying pipe of the pneumatic conveying system can be maintained at a preset value, normal and safe production is guaranteed, and the conversion of the new kinetic energy and the old kinetic energy of the equipment in safe operation is realized.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of a pneumatic conveying system of the present application;
FIG. 2 is a schematic connection diagram of a pneumatic conveying system in an embodiment;
FIG. 3 is a schematic diagram showing a control process of a constant pressure control system of the pneumatic conveying system in the embodiment;
FIG. 4 is a schematic diagram of a pneumatic conveying system of a homogenization silo of a cement plant in an embodiment;
fig. 5 is a flowchart of a control method of the pneumatic conveying system according to the present application.
Fig. 6 is a flow chart of a master pressure supervision method of a pneumatic conveying system in an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. It should be noted that, in the embodiments and examples of the present application, the feature vectors may be arbitrarily combined with each other without conflict.
The pneumatic conveying method is mainly adopted for conveying raw materials into a homogenizing silo in a novel dry-process cement plant at present, the pneumatic conveying in the homogenizing silo is not only used for conveying the raw materials into the homogenizing silo, but also used for stirring air in the homogenizing silo, and the pneumatic conveying is mainly embodied in a large silo outer ring, a large silo inner ring and a small silo in the homogenizing silo.
At present, the pneumatic transmission of a homogenization silo in a plurality of cement manufacturing industries still adopts three roots fans to respectively carry out pneumatic transmission on each pneumatic transmission pipeline, the roots fans work in a mechanical transmission mode, the efficiency is low, a frequency conversion technology is not adopted, the pressure of certain pneumatic transmission pipelines is overhigh, and a user can only adopt a bypass valve pressure relief working mode to maintain the normal work of the pneumatic transmission pipelines, so that the energy waste is caused.
As shown in fig. 1 and 2, the pneumatic conveying system of the present application includes: a main conveying pipe 100, a branch conveying pipe 200 connected to the main conveying pipe 100, and a constant pressure control system 300. The constant pressure control system 300 includes a magnetic levitation blower 310 installed at one end of the main conveyor pipe 100, a frequency converter 320 connected to the magnetic levitation blower 310, and a controller 330 connected to the frequency converter 320. The frequency converter 320 is connected with the magnetic suspension blower 310 and used for adjusting the wind speed of the magnetic suspension blower 310; the conveying branch pipe 200 is provided with a rotary valve 900 for adjusting the air flow of the conveying branch pipe 200; the controller 330 is configured to control the rotational opening of the rotary valve 900 and to control the driving frequency of the frequency converter 320. As shown in fig. 3, the controller 330 controls the driving frequency of the frequency converter 320 according to the real-time pressure of the main delivery pipe 100 to adjust the rotation speed of the magnetic levitation blower 300 so as to maintain the pressure in the main delivery pipe 100 constant. The controller 330 controls the rotation degree of the rotary valve 900 according to the real-time pressure of the delivery branch pipe 200 to maintain the pressure in the delivery branch pipe 200 constant. The pneumatic conveying system carries out pneumatic conveying on the pneumatic conveying pipeline through the magnetic suspension air blower 310, and effectively reduces production cost and the equipment failure rate of the pneumatic conveying system.
As an example, as shown in fig. 3, the frequency converter 320 is connected to the magnetic levitation blower 310 to feed back the rotation speed status of the magnetic levitation blower 310 to the controller 330.
As shown in fig. 1 and 2, a main pipe pressure sensor 600 is arranged in the main delivery pipe 100; a branch pipe pressure sensor 700 is arranged on the conveying branch pipe; the controller 330 is in data connection with the main pipe pressure sensor 600 and the branch pipe pressure sensor 700, respectively, to acquire the real-time pressure of the delivery main pipe 100 and the real-time pressure of the delivery branch pipe 200.
Preferably, the main pipe pressure sensor 600 is disposed at the air outlet of the magnetic levitation blower 300, and the branch pipe pressure sensor 700 is disposed at the outlet of the delivery branch pipe 200.
As an example, the controller of the constant voltage control system 300 is a PLC controller, and the constant voltage control system 300 includes an operation panel through which control parameters of the constant voltage control system can be input.
As an example, the pneumatic conveying system of the present application further includes a central control system in communication with the constant pressure control system 300, and the central control system is used for remotely controlling the constant pressure control system 300. Under the condition, the central control system can realize the simultaneous monitoring and control of the multiple groups of pneumatic conveying systems.
Based on the above example, a possible implementation manner is that the controller 300 of the constant pressure control system 300 of the pneumatic conveying system of the present application is connected to the central control system through twisted pair wires in communication, and the parameters of the magnetic suspension blower 310, the pressure of the main conveying pipe 100 and the pressures of the branch conveying pipes 200 can be set through the central control system, so that the magnetic suspension blower 310 does not need to manually go to the pneumatic conveying system 300 for setting, and meanwhile, the real-time state of the magnetic suspension blower 310 can also be transmitted to the central control system through a communication signal and displayed in the central control system.
As an embodiment of the present application, as shown in fig. 4, the pneumatic conveying system of the present application is a pneumatic conveying system of a cement homogenizing plant, and includes: the system comprises a main conveying pipe 100, three conveying branch pipes 200 sequentially connected with the main conveying pipe 100 along the conveying direction of the main conveying pipe 100, a large bin outer ring 01 sequentially connected with the three conveying branch pipes 200 along the conveying direction of the main conveying pipe 100, a large bin inner ring 02, a small bin 03 and a constant pressure control system 300. The constant pressure control system 300 includes a magnetic levitation blower 310 installed at one end of the main conveyor pipe 100, a frequency converter 320 connected to the magnetic levitation blower 310, and a controller 330 connected to the frequency converter 320.
A main pipe pressure sensor 600 is arranged in the main conveying pipe 100; the three conveying branch pipes 200 are respectively provided with a rotary valve 900 for adjusting the air flow, and the three conveying branch pipes 200 are respectively provided with a branch pipe pressure sensor 700 and a rotary valve 900 for adjusting the air flow.
The controller 330 is respectively connected with the main pipe pressure sensor 600 and the three branch pipe pressure sensors 700 through data signals to acquire the air pressure in the main conveying pipe 100 and the air pressure in the three branch pipes in real time.
As shown in fig. 3, the controller 330 is electrically connected to the frequency converter 320, and the controller 330 controls the driving frequency of the frequency converter 320 according to the real-time pressure in the main delivery pipe 100 to adjust the rotation speed of the magnetic levitation blower 300 so as to maintain the pressure in the main delivery pipe 100 at the preset pressure value. The frequency converter 320 feeds back the rotation speed status of the magnetic levitation blower 310 to the controller 330 to monitor the operation status of the magnetic levitation blower 310 in real time.
As shown in fig. 3, the controllers 330 are electrically connected to the rotary valves 900, respectively, and the controllers 330 respectively control the rotary openings of the three rotary valves 900 according to the real-time pressures of the respective delivery branch pipes 200 so as to maintain the pressures in the three delivery branch pipes 200 at respective preset pressure values.
The controller 330 may further set a preset pressure difference between the preset pressure values of the branch delivery pipes 200 and the branch delivery pipes 200, maintain the pressure difference between the main delivery pipe 100 and each branch delivery pipe 200 at a preset difference value according to the real-time pressure difference between the preset pressure values of the branch delivery pipes 200 and the branch delivery pipes 200, and control the pressure in the main delivery pipe 100 to be greater than the pressure in any branch delivery pipe 200. The current situation that three pneumatic conveying pipelines including a large-bin outer ring 01, a large-bin inner ring 02 and a small bin 03 in a homogenization silo of a cement plant need three fans with different pressures for air supply is solved, a magnetic suspension air blower is used for supplying air for the three pneumatic conveying pipelines at the same time, the pressures of the three pipelines are different, and the pressure requirements of working conditions are met.
The control method of the pneumatic conveying system of the present application, as shown in fig. 5, includes the following main pipe pressure control method and branch pipe pressure control method. The main pipe pressure control method and the branch pipe pressure control method are performed simultaneously.
As shown in fig. 5, the master pipe pressure control method includes:
s101 sets a preset pressure value of the main delivery pipe 100 through the controller 330.
S102 the controller 330 compares the real-time pressure of the main delivery pipe 100 with the preset pressure value of the main delivery pipe 100, and if the real-time pressure of the main delivery pipe 100 is different from the preset pressure value of the main delivery pipe 100, the process proceeds to step S103.
S103, the controller 330 adjusts the driving frequency change of the frequency converter 320 and then adjusts the rotating speed of the magnetic suspension blower 310 so as to adjust the air pressure in the main conveying pipe 100 to the preset pressure value of the main conveying pipe 100.
As shown in fig. 5, the branch pipe pressure control method includes:
s201 sets a preset pressure value of the delivery manifold 200 through the controller 330.
S202 the controller 330 compares the acquired real-time pressure of the conveying branch pipe 200 with the preset pressure value of the conveying branch pipe 200, and if the real-time pressure of the conveying branch pipe 200 is different from the preset pressure value of the conveying branch pipe 200, the process proceeds to step S203.
S203 the controller 330 adjusts the opening of the rotary valve 900 and thus the gas flow in the branch delivery pipe 200 to adjust the gas pressure in the branch delivery pipe 200 to a preset pressure value.
As an example, in step S203 of the branch pipe pressure control method, the controller 330 adjusts the opening degree of the rotary valve 900 according to the real-time pressure difference e (t) between the real-time pressure of the conveying branch pipe 200 and the preset pressure value of the conveying branch pipe 200. The controller 330 controls the rotation opening of the rotary valve 900 according to the real-time pressure difference e (t) as follows:
where e (t) is the pressure difference between the preset pressure values of the branch delivery pipe 200 and the branch delivery pipe 200, and u (t) is the current valve opening value of the rotary valve 900.
The control method of the pneumatic transmission system further comprises a main pipe pressure supervision method.
As an example, the supervisor pressure supervision method comprises:
s301 the controller 330 compares the real-time pressure of the main delivery pipe 100 with the real-time pressure of the branch delivery pipe 200, and if the real-time pressure of the main delivery pipe 100 is lower than the real-time pressure of the branch delivery pipe 200, the process proceeds to step S302.
S302, the controller 330 controls the driving frequency of the frequency converter 320 to adjust the rotating speed of the magnetic suspension blower 310, so as to adjust the air pressure in the main conveying pipe 100 to be higher than the air pressure in the branch conveying pipe 200.
As another example, as shown in fig. 6, the master pressure supervision method includes the following steps.
S301 the controller 330 compares the real-time pressure of the main delivery pipe 100 with the real-time pressure of the branch delivery pipe 200, and determines whether the real-time pressure of the main delivery pipe 100 is lower than the real-time pressure of the branch delivery pipe 200, and if the real-time pressure of the main delivery pipe 100 is lower than the real-time pressure of the branch delivery pipe 200, the process proceeds to step S303.
Step S303 the controller 330 compares the real-time pressure of the main delivery pipe 100 with the preset pressure value of the branch delivery pipe 200, and determines whether the real-time pressure of the main delivery pipe 100 is smaller than the preset pressure value of the branch delivery pipe 200. When the real-time pressure of the main delivery pipe 100 is less than the preset pressure value of the branch delivery pipe 200, the process proceeds to step S302. When the real-time pressure of the main delivery pipe 100 is not less than the preset pressure value of the branch delivery pipe 200, the process proceeds to step S304.
In step S302, the controller 330 controls the driving frequency of the inverter to adjust the rotation speed of the magnetic levitation blower 310, so as to adjust the air pressure in the main delivery pipe 100 to be higher than the air pressure in the branch delivery pipes 200.
In step S304, the controller 330 changes the preset pressure value of the main conveying pipe 100 according to the preset pressure value of the main conveying pipe 200, and then controls the driving frequency of the frequency converter 320 according to the changed preset pressure value of the main conveying pipe 100, so as to adjust the air pressure in the main conveying pipe 100 to be higher than the air pressure in the main conveying pipe 200.
Based on the above example, in a possible implementation manner, when the real-time pressure of the main delivery pipe 100 is lower than the preset pressure value of the branch delivery pipe 200 in step S304, the controller 330 changes the preset pressure value of the main delivery pipe according to the following criteria:
Pmain pipeline=PBranch pipe+10kPa。
When a plurality of conveying branch pipes (200) are arranged, the basis for changing the preset pressure value of the conveying main pipe (100) is as follows:
Pmain pipeline=PBranch pipe+10kPa
When there are a plurality of branch pipes 200, the basis for changing the preset pressure value of the main pipe 100 is as follows:
Pmain pipeline=MAX(PBranch pipe)+10kPa; MAX(PBranch pipe) Based on the above three examples, the control method of the pneumatic conveying system, the main pipe pressure control method, the branch pipe pressure control method, the pressure difference control method, and the main pipe pressure monitoring method of the present application are performed simultaneously for the largest one of the preset pressure values in all the conveying branch pipes 200.
The utility model provides a pneumatic conveying system can solve many fans respectively for the wasting of resources's that many pipeline air supplies brought problem, the pneumatic conveying of this application uses a magnetic suspension air-blower can be simultaneously for a plurality of pipeline air supplies, can also be according to the wind speed of presetting pressure value automatically regulated air-blower and the valve aperture of rotary valve so that carry the intraductal pressure of being responsible for and many transport branch pipes to maintain respectively at respective preset pressure value, the automation level of mill has been improved, the saving of realization land resource of very big degree, the saving of electric power resource, the saving of manpower resources.
It is to be noted that, in this document, the terms "comprises", "comprising" or any other variation thereof are intended to cover a non-exclusive inclusion, so that an article or apparatus including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of additional like elements in the article or device comprising the element.
The above embodiments are merely to illustrate the technical solutions of the present invention and not to limit the present invention, and the present invention has been described in detail with reference to the preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made without departing from the spirit and scope of the present invention and it should be understood that the present invention is to be covered by the appended claims.
Claims (9)
1. A pneumatic conveying system for the homogenization of cement raw meal, comprising: the system comprises a main conveying pipe (100), a branch conveying pipe (200) connected with the main conveying pipe (100) and a constant pressure control system (300), wherein the constant pressure control system (300) comprises a magnetic suspension blower (310) installed at one end of the main conveying pipe (100), a frequency converter (320) connected with the magnetic suspension blower (310) and a controller (330) connected with the frequency converter (320); the frequency converter (320) is connected with the magnetic suspension blower (310) and is used for adjusting the rotating speed of the magnetic suspension blower (310); the conveying branch pipe (200) is provided with a rotary valve (900) for adjusting the air flow of the conveying branch pipe (200); the controller (330) is arranged to control the rotational opening of the rotary valve (900) and to control the driving frequency of the frequency converter (320);
the controller (330) controls the driving frequency of the frequency converter (320) according to the real-time pressure of the main conveying pipe (100) so as to adjust the rotating speed of the magnetic suspension blower (310) and further maintain the pressure in the main conveying pipe (100) to be constant;
the controller (330) controls the rotary opening degree of the rotary valve (900) according to the real-time pressure of the conveying branch pipe (200) so as to maintain the pressure in the conveying branch pipe (200) constant;
the pressure of the main conveying pipe (100) is greater than that of the branch conveying pipe (200).
2. A pneumatic conveying system according to claim 1, characterised in that a main pipe pressure sensor (600) is arranged in the main conveying pipe (100); a branch pipe pressure sensor (700) is arranged in the conveying branch pipe (200); the controller (330) is respectively in data connection with the main pipe pressure sensor (600) and the branch pipe pressure sensor (700) to acquire the real-time pressure of the main conveying pipe (100) and the real-time pressure of the branch conveying pipe (200).
3. The pneumatic conveying system according to claim 2, wherein the main pipe pressure sensor (600) is arranged at the air outlet of the magnetic suspension blower (310), and the branch pipe pressure sensor (700) is arranged at the outlet of the conveying branch pipe (200).
4. A pneumatic conveying system according to any one of claims 1 to 3, further comprising a central control system in communication with the constant pressure control system (300), the central control system being configured to remotely control the constant pressure control system (300).
5. A control method of a pneumatic conveying system, which is characterized in that the pneumatic conveying system according to any one of claims 1-4 is adopted, and comprises the following main pipe pressure control method and branch pipe pressure control method;
the main pipe pressure control method comprises the following steps:
s101, setting a preset pressure value of the main conveying pipe (100) through the controller (330);
s102, the controller (330) compares the real-time pressure of the main conveying pipe (100) with a preset pressure value of the main conveying pipe (100), and when the real-time pressure of the main conveying pipe (100) is different from the preset pressure value of the main conveying pipe (100), the step S103 is carried out;
s103, the controller (330) adjusts the driving frequency change of the frequency converter (320) so as to adjust the rotating speed of the magnetic suspension blower (310) to adjust the air pressure in the main conveying pipe (100) to a preset pressure value of the main conveying pipe (100);
the branch pipe pressure control method includes:
s201, setting a preset pressure value of the conveying branch pipe (200) through the controller (330);
s202, the controller (330) compares the acquired real-time pressure of the conveying branch pipe (200) with a preset pressure value of the conveying branch pipe (200), and when the real-time pressure of the conveying branch pipe (200) is different from the preset pressure value of the conveying branch pipe (200), the step S203 is carried out;
s203, the controller (330) adjusts the opening degree of the rotary valve (900) so as to adjust the gas flow in the conveying branch pipe (200) to adjust the gas pressure in the conveying branch pipe (200) to a preset pressure value;
wherein the main pipe pressure control method and the branch pipe pressure control method are performed simultaneously;
in step S203 of the branch pipe pressure control method, the controller (330) adjusts the opening degree of the rotary valve (900) according to a real-time pressure difference e (t) between a real-time pressure of the conveying branch pipe (200) and a preset pressure value of the conveying branch pipe (200);
the controller (330) controls the rotary opening degree of the rotary valve (900) according to the real-time pressure difference e (t) according to the following steps:
wherein e (t) is the pressure difference between the preset pressure values of the branch conveying pipe (200) and the branch conveying pipe (200), and u (t) is the current valve opening value of the rotary valve (900).
6. The method of controlling a pneumatic conveying system according to claim 5, further comprising a master pipe pressure supervision method; the supervisor pressure supervision method comprises the following steps:
s301, the controller (330) compares the real-time pressure of the main delivery pipe (100) with the real-time pressure of the branch delivery pipe (200), and the step S302 is carried out when the real-time pressure of the main delivery pipe (100) is lower than the real-time pressure of the branch delivery pipe (200);
s302, the controller (330) controls the driving frequency of the frequency converter (320) to adjust the rotating speed of the magnetic suspension blower (310), and the air pressure in the main conveying pipe (100) is adjusted to be higher than the air pressure in the branch conveying pipe (200).
7. The control method of pneumatic conveying system according to claim 6, wherein when the real-time pressure of said main conveying pipe (100) is lower than the real-time pressure of said branch conveying pipe (200) in step S301, said main pipe pressure supervision method further comprises step S303;
s303, comparing the real-time pressure of the main conveying pipe (100) with the preset pressure value of the branch conveying pipe (200); when the real-time pressure of the main conveying pipe (100) is higher than the preset pressure value of the branch conveying pipe (200), the step S302 is carried out; when the real-time pressure of the main conveying pipe (100) is lower than the preset pressure value of the branch conveying pipe (200), the step S304 is executed;
s304, the controller (330) changes the preset pressure value of the main conveying pipe (100) according to the preset pressure value of the branch conveying pipe (200), then controls the driving frequency of the frequency converter (320) according to the changed preset pressure value of the main conveying pipe (100), and adjusts the air pressure in the main conveying pipe (100) to be higher than the air pressure in the branch conveying pipe (200).
8. The control method of pneumatic conveying system according to claim 7, characterized in that, when the real-time pressure of the main conveying pipe (100) is lower than the preset pressure value of the branch conveying pipe (200) in step S304, the controller (330) changes the preset pressure value of the main conveying pipe (100) according to the following:
Pmain pipeline=PBranch pipe+10kPa。
9. The control method of the pneumatic conveying system according to claim 8, characterized in that, when there are a plurality of said conveying branch pipes (200), the preset pressure value of said main conveying pipe (100) is changed according to the following:
Pmain pipeline=MAX(PBranch pipe)+10kPa；
MAX(PBranch pipe) The maximum pressure value in all the conveying branch pipes (200) is the largest one.
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