CN104418092B - A kind of powder wind send device - Google Patents
A kind of powder wind send device Download PDFInfo
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- CN104418092B CN104418092B CN201310410061.0A CN201310410061A CN104418092B CN 104418092 B CN104418092 B CN 104418092B CN 201310410061 A CN201310410061 A CN 201310410061A CN 104418092 B CN104418092 B CN 104418092B
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Abstract
The invention discloses a kind of powder wind and send device, at least include connecting filler bin by conveyance conduit, being arranged on the air conveying unit in the exit of cottrell；It is provided with pressure sensing cell and bypass block clearing unit on conveyance conduit, air conveying unit arranges control unit, is provided with permanent wind Hair Fixer generating apparatus at air conveying unit, at filler bin, is provided with material receiver；Powder, under permanent wind Hair Fixer generating apparatus and material receiver cooperate, by the air conveying unit controlled by control unit, is delivered in filler bin；The present invention is applicable to powder recovery technology field, and the present invention can carry out the conveying of powder, collection in the most airtight environment, thus avoids the air environmental pollution that powder causes.
Description
Technical Field
The invention relates to the technical field of powder recovery, in particular to a powder pneumatic conveying device.
Background
At present, with the continuous improvement of the technical level of the manufacturing industry, more and more byproducts are produced in the manufacturing process; wherein the powder left by the combustion of coal is a by-product. The powder is fine ash collected from flue gas generated after coal combustion, and a large amount of powder can generate raise dust and pollute the atmosphere without being treated; if discharged into a water system, the river can be silted, and toxic chemicals in the river can cause harm to human bodies and organisms. The discharge of the powder causes great harm to the production and the life of people, and the comprehensive expression is shown in the following aspects: encroaching on land, polluting soil, polluting water, polluting atmosphere, harming human health, etc.
Although the technological manufacturing level is continuously innovated, the net combustion rate in the existing coal burning technology is as high as 99%, and the overall combustion efficiency can reach more than 95%, some powder materials are still inevitably generated, and the powder materials are generally intensively recovered through dust collection equipment. Because the powder particles are small, the weight is light, and the dust collecting operation space of the existing dust collecting equipment is not high in tightness, the existing dust collecting equipment easily blows away the powder and floats in the air in the process of collecting the powder, and the atmospheric environment pollution is caused.
Disclosure of Invention
The invention aims to provide a powder pneumatic conveying device which can convey and collect powder in a relatively closed environment so as to avoid atmospheric environmental pollution caused by the powder.
In order to solve the technical problem, the invention provides a powder pneumatic conveying device which is characterized by at least comprising a powder bin and a pneumatic conveying unit, wherein the pneumatic conveying unit is connected with the powder bin through a conveying pipeline and is arranged at an outlet of an electric dust collector; the conveying pipeline is provided with a pressure detection unit and a bypass blockage clearing unit, the pneumatic conveying unit is internally provided with a control unit, the pneumatic conveying unit is provided with a constant air pressure generating device, and the powder bin is provided with a material receiver; the powder is conveyed to a powder bin through a pneumatic conveying unit controlled by a control unit under the mutual matching of a constant air pressure generating device and a material receiver; wherein,
the pressure detection unit is used for monitoring the pressure value inside the pipeline and transmitting the real-time pressure value of the powder conveying pipeline to the control unit in the conveying process;
the control unit is used for determining the real-time position of the powder in the conveying pipeline according to the real-time pressure value sent by the pressure detection unit, comparing the real-time pressure value with the preset pressure value at the position to judge whether blockage occurs or not, and sending a blockage clearing instruction to the bypass blockage clearing unit for blockage clearing operation; the control device is used for controlling the device to continue to circularly convey after the bypass blockage cleaning unit finishes blockage cleaning operation;
and the bypass blockage clearing unit is used for opening a bypass valve at the blockage position of the conveying pipeline according to a blockage clearing instruction sent by the control unit, collecting powder through the bypass pipeline, and feeding back a completion signal to the control unit after blockage clearing operation is completed.
The powder pneumatic conveying device also has the following characteristics that the control unit is further used for determining the actual powder conveying time according to the real-time pressure value sent by the pressure detection unit, comparing the actual powder conveying time with the preset powder conveying time, judging whether blockage occurs or not, and sending a blockage clearing instruction to the bypass blockage clearing unit for blockage clearing operation.
The powder pneumatic conveying device also has the following characteristics that the control unit is also used for comparing a real-time pressure value sent by the pressure detection unit with a preset pressure value at the position, judging whether the phenomenon of too fast system pressure reduction occurs or not, controlling the valve of the device to restore the initial state according to the judgment result, and controlling the device to perform pressurization operation again;
the control unit is also used for determining the actual delivery time of the powder according to the real-time pressure value sent by the pressure detection unit, comparing the actual delivery time with the preset delivery time, judging whether the phenomenon of over-short delivery time occurs or not, controlling the valve of the device to restore the initial state according to the judgment result, and controlling the device to perform pressurization operation again;
after the control unit control device carries out pressurization operation, the control device carries out circulating conveying, and when the control unit controls the real-time pressure value sent by the pressure detection unit to be compared with the preset pressure value at the position, the control unit carries out automatic alarm action when judging that the phenomenon that the system is quickly depressurized occurs again.
The pneumatic powder conveying device also has the following characteristics that the pneumatic conveying device comprises a bin and a bin pump which are arranged at the outlet of the electric dust collector; a feed valve is arranged between the bin pump and the bin,
a discharge valve is arranged between the powder bin and the bin pump, an exhaust valve is arranged between the electric dust collector and the bin pump, and a first air valve is arranged between the constant air pressure generating device pump and the bin pump.
The powder air conveying device also has the following characteristics that a second air valve is arranged between the constant air pressure generating device and the powder bin.
The powder pneumatic conveying device also has the following characteristics that a blocking discharge valve is arranged between the powder bin and the electric dust collector.
The powder pneumatic conveying device also has the following characteristics that a material level meter is arranged in the bin pump.
The powder pneumatic conveying device also has the following characteristics that a conveying reamer is arranged below the powder bin and connected with a mixing reamer;
the conveying reamer conveys powder in the powder bin to the mixing reamer.
The powder air-conveying device also has the following characteristics that the conveying pipeline is a seamless steel pipe
The technical scheme of the invention has the following beneficial characteristics:
the powder pneumatic conveying device comprises a powder bin connected through a conveying pipeline and a pneumatic conveying unit arranged at an outlet of an electric dust collector; the conveying pipeline is provided with a pressure detection unit and a bypass blockage clearing unit, the pneumatic conveying unit is internally provided with a control unit, the pneumatic conveying unit is provided with a constant air pressure generating device, and the powder bin is provided with a material receiver; the powder is conveyed to the powder bin through the pneumatic conveying unit controlled by the control unit under the mutual matching of the constant air pressure generating device and the material receiver. By applying the invention, the powder can be conveyed into the powder bin from the electric dust collector through the closed conveying space, the whole conveying process can be automatically controlled, and the powder is effectively prevented from floating into the air. In the powder air conveying device, the conveying pipeline can adopt a seamless steel pipe, so that the installation is convenient, and the tightness of a conveying space is ensured; two full-material prompting modes of a material level meter and a timer can be adopted in the bin pump, so that the detection of the feeding condition of the powder is accurately realized, and the powder accumulation and blockage generated in the feeding process are avoided; a blowing link can be arranged after the material conveying is finished, so that the material in the pipe is completely conveyed, and the accumulation and blockage of residual materials are avoided; further, a blocking discharge valve can be arranged between the powder bin and the electric dust collector, blocking treatment is carried out in a reverse pumping mode, and the condition that blocking aggravation is caused when a conveying pipeline is blocked in a positive pressure state is avoided.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
FIG. 1 is a schematic structural view of an embodiment of an air blowing device for powder of the present invention;
FIG. 2 is a schematic structural diagram of an embodiment of the pneumatic conveying apparatus according to the present invention;
fig. 3 is a block flow diagram of an embodiment of material transport in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The invention provides an air conveying device for powder, which utilizes the mutual matching of positive pressure air generated by the working of a constant air pressure generating device and negative pressure air generated by the working of a material receiver to ensure that the powder flows into a space with low pressure from a space with high pressure in a closed operation space so as to realize the conveying and the collection of the powder.
The invention provides a powder pneumatic conveying device which comprises a pneumatic conveying unit, wherein the pneumatic conveying unit is used for collecting and conveying powder in an electric dust collector into a powder bin. As shown in fig. 1, the pneumatic conveying unit 6 is arranged at the outlet of the electric dust collector 1, and the pneumatic conveying unit 6 is communicated with the powder bin 11 through a conveying pipeline 7; a constant air pressure generating device 8 is arranged at one end of the pneumatic conveying unit 6, a material receiver 12 is arranged at one end of the powder bin 11, a pressure detection unit and a bypass blockage clearing unit are arranged on the conveying pipeline, and a control unit and the bypass blockage clearing unit are arranged in the pneumatic conveying unit; in the specific conveying process, the constant air pressure generating device 8 and the material receiver 12 form a conveying power source, the control unit controls the on/off of corresponding valves in the pneumatic conveying unit 6 to finish the conveying process of the powder, wherein the conveying process is started after the powder is atomized. Preferably, in the embodiment of the invention, the conveying pipeline 7 is a seamless steel pipe, so that the tightness of the powder conveying space is effectively ensured. A conveying reamer 10 is arranged at the outlet of the powder bin 11, the conveying reamer 10 is connected with a mixing reamer, and powder in the powder bin 11 can be conveyed to the mixing reamer 9 through the conveying reamer 10, so that the powder raw material can be reused; in particular operation, the constant wind pressure generating device 8 may comprise an air compressor. Wherein,
the pressure detection unit is used for monitoring the pressure value inside the pipeline and transmitting the real-time pressure value of the powder in the conveying process to the control unit; in specific operation, pressure gauges can be arranged on a plurality of nodes of the conveying pipeline, and the pressure gauges transmit the pressure of each node to the control unit in real time;
the control unit is used for determining the real-time position of the powder in the conveying pipeline according to the real-time pressure value sent by the pressure detection unit, comparing the real-time pressure value with the preset pressure value at the position to judge whether blockage occurs or not, and sending a blockage clearing instruction to the bypass blockage clearing unit for blockage clearing operation; in the specific operation, 6 kilograms of pressure can be applied to the conveying pipeline, and the normal conveying time of the powder under the pressure condition is 50 seconds; meanwhile, the control unit can judge the normal conveying pressure value corresponding to each node according to the conveying track and the overall pressure of the powder, and meanwhile, the control unit pre-loads the normal conveying pressure values of each node in the system; when the powder is conveyed, the pressure detection unit outputs real-time pressure values of all nodes to the control unit, and the control unit compares the real-time pressure values of the current nodes with loaded normal node pressure values to judge whether an abnormal condition occurs or not; and simultaneously carrying out corresponding processing operation. Considering the error of one point existing in the actual conveying, the normal node pressure values are all a normal range value, and are not a specific pressure value.
Wherein, the abnormal condition is that the node pressure value is larger than the normal conveying pressure value or the node pressure value is smaller than the normal pressure value; when the pressure value of the node is larger than the normal conveying pressure value, the node is indicated to be sent to be blocked, at the moment, a blocking clearing instruction sent by the control unit opens a bypass valve for a bypass blocking clearing unit of the node at the position where the blockage occurs, powder is collected through a bypass pipeline, and a completion signal is fed back to the control unit after the blocking clearing operation is completed. The bypass blockage removing unit is a plurality of branch pipelines arranged on the main pipeline of the conveying pipeline and provided with corresponding valve switches, and the other end of each branch pipeline is a temporary powder collecting box; and when the bypass blockage cleaning unit finishes blockage cleaning operation, the control device continues to circularly convey. When the pressure value of the node is smaller than the normal conveying pressure value, the pressure drop of the node is over fast, and the node is indicated to have leakage; namely, the control unit controls the valve of the device to restore the initial state according to the phenomenon that the pressure of the system is reduced too fast, and the control device carries out the pressurization operation again. After the control unit control device carries out pressurization operation again, the control unit control device starts to carry out circulating conveying operation; when the control unit controls the real-time pressure value sent by the pressure detection unit to be compared with the preset pressure value of the node, and the phenomenon that the system is quickly depressurized again is judged to occur, automatic alarm action is carried out; wherein, the automatic alarm action can be realized by arranging an acousto-optic alarm lamp; when the control unit judges that the leakage occurs again, an alarm signal is sent out, and acousto-optic alarm and the like are connected with corresponding circuits to carry out alarm operation.
When the control unit judges that the actual conveying time is equal to the preset conveying time according to the real-time pressure value sent by the pressure detection unit, and the pressure value in the conveying pipeline is equal to the no-load running pressure value; indicating the end of the powder conveying process; at the moment, the control unit controls the device again at intervals to carry out a new round of powder conveying operation, namely the device is an intermittent cycle working device
In the specific operation, the control unit can also determine the actual powder delivery time according to the real-time pressure value sent by the pressure detection unit, compare the actual delivery time with the preset delivery time, judge whether blockage occurs and send a blockage clearing instruction to the bypass blockage clearing unit for blockage clearing operation. In the specific operation, 6 kilograms of pressure is applied in advance, the normal conveying time is 50s, and the normal conveying time is set to 47s-53s in consideration of certain error between the actual conveying process and the theoretical calculation time, so that the conveying within the range belongs to normal conveying; when the actual conveying time is longer than the normal conveying time, namely the conveying delay of the system occurs, the blockage phenomenon occurs in the conveying pipeline; and the control unit is used for controlling the bypass blockage clearing single cloud at the node to carry out corresponding blockage clearing operation when judging the node blocked by the conveying pipeline by combining the comparison result of the real-time pressure value and the normal pressure value of each node. When the actual conveying time is shorter than the normal conveying time, the powder conveying practice is too fast; indicating that a leak has occurred there and the control device valve reverts to the initial state, the control device again performs a pressurization operation, i.e. restores the pressure inside the delivery conduit to the initial pressure state.
Preferably, in the specific operation of the present invention, the conveying operation can be realized as follows; wherein, the pneumatic conveying unit 6 is provided with a stock bin, a bin pump and a valve; as shown in fig. 2, the bin 13 is disposed at the outlet of the electric dust collector 1, the feeding valve 14 is disposed between the bin pump 16 and the bin 13, the discharging valve 20 is disposed between the bin pump 16 and the powder bin 11, the exhaust valve 21 is disposed between the bin pump 16 and the electric dust collector 1, and the first air valve 17 is disposed between the bin pump 16 and the constant air pressure generating device 8. Preferably, the conveying pipeline above the feeding valve 14 can be further provided with a manual gate valve 22, so that after the whole debugging of the equipment is finished, an operator can adjust a gate of the manual gate valve 22 according to the actual flow of the powder in the conveying pipeline 7, and further control the amount of the powder entering the bin pump 16.
Wherein, a material level meter 15 is arranged in the bin pump 16 and is used for sending a full material signal when the material height reaches the measuring point of the material level meter 15. Preferably, a time controller is arranged in the bin pump 16, and the time controller can be controlled by a PLC (programmable logic controller), so that when the feeding valve 14 is opened, the PLC controls the time controller to start and start timing, and when the timing reaches a preset time, a full material signal is sent. In the embodiment of the invention, preferably, two prompting modes of combining the level indicator and the time controller are adopted for feeding completion, and a full material signal is sent out when any one of the two conditions is met, so that material accumulation and blockage caused by failure of the level indicator 15 are effectively avoided.
In the concrete operation, the process of material conveying by the pneumatic conveying unit 6 is mainly divided into three stages: a feeding stage and a conveying stage. A purging stage; wherein,
a feeding stage: when the bin pump 16 is put into operation, firstly, the exhaust valve 21 is opened, the bin pump 16 and the electric dust collector 1 are connected, and the positive pressure generated in the bin pump 16 during the last working cycle is discharged; then the feed valve 14 is opened, the powder material freely falls into the bin pump 16, and when the level indicator 15 sends a full discharge signal, the feed valve 14 is automatically closed; alternatively, when the feed valve 14 is open for a time equal to the predetermined time of the time controller, the feed valve 14 is also automatically closed. In the concrete operation, after the material conveying of the last period is finished, the pneumatic conveying device 6 still keeps high pressure in the bin pump 16, and at the moment, if the feeding valve 14 is directly opened, the pressure is released instantly, the material in the buffer bin can be flushed, and the environmental pollution is caused. In the embodiment of the invention, the exhaust valve 21 is connected to the outlet of the electric dust collector 1, and as a certain negative pressure is kept in the sealed cavity of the electric dust collector 1, the impact caused when the exhaust valve 21 releases the instantaneous pressure can be relieved, and then the feed valve 14 is opened, and powder can easily fall into the bin pump 16.
A conveying stage: when the bin pump 16 is full, the feed valve 14 and the exhaust valve 21 of the bin pump 16 are closed, the discharge valve 20 of the bin pump 16 is opened, the first air valve 17 is opened for air intake, the powder material in the bin pump 16 is pressed into the conveying pipeline 7, and then the second air valve 18 is opened for blowing-assisting operation, and the powder material in the conveying pipeline 7 is conveyed into the powder bin 11 along with the air flow.
A purging stage: when the material conveying tends to be finished, the pressure in the conveying pipeline 7 is gradually reduced; when the pressure detection unit value set by the conveying pipeline 7 reaches the preset pressure value, the conveying pipeline 7 indicates that the powder inside the conveying pipeline 7 is basically finished in conveying operation. Preferably, a second air valve 18 is arranged between the constant air pressure generating device 8 and the powder bin 11; when the material conveying is finished, the first air valve 17 is closed, the second air valve 18 is kept in an open state, and the purging is continued for a period of time, so that the material in the conveying pipeline 7 is completely conveyed, and the blockage caused by the accumulation of residual materials is avoided; the discharge valve 20 is then closed and the entire conveying process is completed, thereby completing one material conveying cycle.
Preferably, in the embodiment of the present invention, a block discharge valve 19 is disposed between the powder bin 11 and the electric dust collector 1. In actual operation, when the pressure detection unit value exceeded the upper limit value, it showed that pipeline 7 may take place the powder jam phenomenon, the device reported to the police and opened stifled valve 19 simultaneously, under the inside negative pressure effect of electric dust collector 1, drew back the powder that blocks up, inhaled electric dust collector 1 to pipeline 7 blocks up and is in the condition that the jam aggravated under the malleation state.
Wherein, the material conveying can adopt a pressure and time dual-control mode. Pressure control, namely, pressure measurement on a conveying pipeline is realized by arranging a pressure detection unit on the pipeline; when the material begins to be conveyed, the pressure in the conveying pipeline gradually rises, and when the material is close to the completion of conveying, the pressure gradually falls; and the control unit compares and judges the current pressure value with the no-load operation pressure value of the pipeline, and when the pressure reaches the no-load operation pressure of the pipeline, the material conveying is finished. The time control means that when the first air valve 17 is opened, the time controller starts timing, the control unit compares and judges the actual conveying time with the preset conveying time, and when the actual conveying time reaches the set conveying time, the material conveying is finished. The time control and the pressure control are used simultaneously and are mutually supplemented, and the pressure control is used for determining whether the material conveying process is finished or not by monitoring a real-time pressure value in the pipeline; the time control is used for determining whether the material process is finished or not by comparing and judging the actual conveying time with the preset conveying time, and the time control avoids wrong determination caused by an interference value when the pressure is monitored so as to accurately determine that the material process is finished. And when the control unit judges that the pressure value is the no-load operation pressure value of the pipeline and the actual conveying time is more than or equal to the preset conveying time, determining that the powder conveying process is finished. The control unit may adopt a programmable logic controller or a single chip microcomputer, and the specific implementation of performing the corresponding comparison and judgment processing by using the control unit is a conventional technical means for those skilled in the art, and the specific implementation is not used for limiting the protection scope of the present invention, and is not described herein again.
As shown in fig. 3, the pneumatic conveying unit 6 has the following conveying flow: firstly, starting a PLC control system, opening an exhaust valve 21, opening a feeding valve 14 after delaying for several seconds, and enabling the system to enter a feeding stage; preferably, in the present embodiment, the inlet valve 14 is opened after a delay of 5 seconds. When the level meter 15 in the bin pump 16 sends out a full signal, or when the time for which the feed valve 14 is opened reaches a predetermined time, the feed valve 14 is closed, and the feeding phase is completed. After delaying for several seconds, closing the exhaust valve 21, opening the discharge valve 20, entering a conveying stage, after delaying for several seconds, opening the first air valve 17, pressing the powder into the conveying pipeline 7, and after delaying for several seconds, opening the second air valve 18 for blowing-assisting operation; preferably, in the embodiment of the present invention, the exhaust valve is closed after delaying for 2 seconds, the first air valve 17 is opened after delaying for 5 seconds, and the second air valve 18 is opened after delaying for 5 seconds. When the pressure value in the conveying pipeline 7 reaches or is smaller than the preset pressure value, the material conveying is basically finished, at this time, a powder blowing stage is started, the first air valve 17 is closed, the second air valve 18 is closed after delaying for several seconds, the discharge valve 20 is closed after delaying for several seconds, and at this time, the powder conveying in the conveying pipeline 7 is basically finished; preferably, in the practice of the present invention, the second air valve 18 is closed after a delay of 10 seconds, and the discharge valve 20 is closed after a delay of 5 seconds; and at this point, a complete material conveying process is finished.
It should be noted that the above mentioned delay operation is intended to perform operations such as feeding, conveying, purging, etc. thoroughly on the powder, the specific delay time may be determined according to the actual powder conveying condition of the conveying pipeline 7, the operations such as opening, closing, delaying, etc. of the valve may be implemented by a time relay and an electromagnetic valve, or may be implemented by manual control of an operator, the specific implementation by utilizing the PLC, the time relay, and the electromagnetic valve is a conventional technical means of those skilled in the art, and the specific implementation is not used for limiting the protection scope of the present invention, and will not be described herein again.
In the concrete operation of the invention, the pneumatic conveying unit 6 can realize full-automatic control in the whole conveying process through a PLC and a time relay. The whole powder conveying process is realized by three control modes, namely field manual control, remote manual control and automatic control; wherein,
the field manual control is mainly used for debugging and detecting operation before equipment runs, electromagnetic valves can be manually adjusted through knobs on a box board of the equipment, whether the actions of the electromagnetic valves are flexible or not is checked, whether the corresponding operation indicator lamps display the actions correctly or not, whether connection ports and conveying pipelines between structures of the equipment are connected normally or not, whether leakage points exist or not and the like are checked;
the remote manual control is mainly used for adjusting the pressure value in the system and monitoring the action condition of the valve, and can be used for adjusting the pressure value in the system and monitoring the action condition of the valve according to the pressure in the material conveying process in the system by controlling a control panel and a virtual keyboard on a remote control cabinet;
the automatic control is mainly used for automatic control in the operation process of the system, after the operations of field manual control and remote manual control are finished, the normal operation of each device on the field is confirmed, and after the pressure value of each pipeline of the conveying pipeline is reasonable, the system selects automatic start control, and at the moment, the system can circularly act according to a preset conveying flow to continuously convey powder in the electric dust collector to the powder bin.
The invention can convey the powder in a relatively closed environment, thereby avoiding atmospheric environmental pollution caused by the powder, and meanwhile, the powder can be developed and utilized again as a raw material, and the invention has obvious progress in the aspects of environmental protection and full utilization of energy; the invention has reasonable structure and is easy to popularize and implement.
Although the embodiments of the present invention have been described above, the above descriptions are only for the convenience of understanding the present invention, and are not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A powder pneumatic conveying device is characterized by at least comprising a powder bin connected through a conveying pipeline and a pneumatic conveying unit arranged at an outlet of an electric dust collector; the conveying pipeline is provided with a pressure detection unit and a bypass blockage clearing unit, the pneumatic conveying unit is internally provided with a control unit, the pneumatic conveying unit is provided with a constant air pressure generating device, and the powder bin is provided with a material receiver; the powder is conveyed to a powder bin through a pneumatic conveying unit controlled by a control unit under the mutual matching of a constant air pressure generating device and a material receiver; wherein,
the pressure detection unit is used for monitoring the pressure value inside the pipeline and transmitting the real-time pressure value of the powder conveying pipeline to the control unit in the conveying process;
the control unit is used for determining the real-time position of the powder in the conveying pipeline according to the real-time pressure value sent by the pressure detection unit, comparing the real-time pressure value with the preset pressure value at the position to judge whether blockage occurs or not, and sending a blockage clearing instruction to the bypass blockage clearing unit for blockage clearing operation; the control device is used for controlling the device to continue to circularly convey after the bypass blockage cleaning unit finishes blockage cleaning operation;
and the bypass blockage clearing unit is used for opening a bypass valve at the blockage position of the conveying pipeline according to a blockage clearing instruction sent by the control unit, collecting powder through the bypass pipeline, and feeding back a completion signal to the control unit after blockage clearing operation is completed.
2. The pneumatic powder conveying device according to claim 1, wherein the control unit is further configured to determine an actual powder conveying time according to the real-time pressure value sent by the pressure detection unit, compare the actual powder conveying time with a preset powder conveying time, determine whether blockage occurs, and send a blockage clearing instruction to the bypass blockage clearing unit for blockage clearing operation.
3. The pneumatic conveying device for powder materials of claim 1, wherein the control unit is further configured to compare a real-time pressure value sent by the pressure detection unit with a preset pressure value at the position, determine whether the phenomenon of too fast system depressurization occurs, and control the device valve to restore the initial state according to the determination result, and then the control device performs pressurization again;
the control unit is also used for determining the actual delivery time of the powder according to the real-time pressure value sent by the pressure detection unit, comparing the actual delivery time with the preset delivery time, judging whether the phenomenon of over-short delivery time occurs or not, controlling the valve of the device to restore the initial state according to the judgment result, and controlling the device to perform pressurization operation again;
after the control unit control device carries out pressurization operation, the control device carries out circulating conveying, and when the control unit controls the real-time pressure value sent by the pressure detection unit to be compared with the preset pressure value at the position, the control unit carries out automatic alarm action when judging that the phenomenon that the system is quickly depressurized occurs again.
4. The pneumatic conveying device for powder lot of any one of claims 1 to 3, wherein the pneumatic conveying device comprises a bin and a bin pump which are arranged at the outlet of the electric dust collector; a feed valve is arranged between the bin pump and the bin,
a discharge valve is arranged between the powder bin and the bin pump, an exhaust valve is arranged between the electric dust collector and the bin pump, and a first air valve is arranged between the constant air pressure generating device pump and the bin pump.
5. The powder pneumatic conveying device of claim 4, wherein a second air valve is further arranged between the constant air pressure generating device and the powder bin.
6. The pneumatic conveying device for powder lot of claim 4, wherein a block discharge valve is arranged between the powder bin and the electric dust collector.
7. The pneumatic powder conveying device as claimed in claim 4, wherein a level gauge is arranged in the bin pump.
8. The powder pneumatic conveying device according to claim 4, wherein a conveying reamer is arranged below the powder bin and connected with a mixing reamer;
the conveying reamer conveys powder in the powder bin to the mixing reamer.
9. The pneumatic conveying device for powder lot of claim 4, wherein the conveying pipeline is a seamless steel pipe.
Priority Applications (1)
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| CN106679411B (en) * | 2017-01-13 | 2019-04-26 | 北新集团建材股份有限公司 | A kind of loading and unloading control method of rotary kiln |
| US10760933B2 (en) * | 2017-04-27 | 2020-09-01 | Oerlikon Metco (Us) Inc. | Method for detecting and diagnosing powder flow stability |
| CN108007217B (en) * | 2017-05-08 | 2023-06-23 | 中冶长天国际工程有限责任公司 | Pneumatic conveying system and method for activated carbon by utilizing waste heat |
| CN107285039B (en) * | 2017-06-26 | 2023-04-14 | 华电电力科学研究院有限公司 | Pneumatic ash conveying method and device for thermal power plant material level control |
| CN109250531B (en) * | 2018-11-01 | 2023-09-19 | 郑州晨丰机械设备有限公司 | Client management system for bulk cargo conveying based on Internet of things and mobile payment |
| CN113666126B (en) * | 2021-08-25 | 2023-09-08 | 福建龙净环保股份有限公司 | Feeding system, feeding equipment conveying control method and conveying control system |
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| CN201334263Y (en) * | 2009-02-05 | 2009-10-28 | 天津科林斯凯环保科技有限公司 | Automatic blowing device of powder material pneumatic conveying pipeline |
| CN202765846U (en) * | 2012-09-24 | 2013-03-06 | 北京立诚石化技术有限公司 | Fresh catalyst improving system used for fluid catalytic cracking (FCC) device |
| CN203529450U (en) * | 2013-09-10 | 2014-04-09 | 北新集团建材股份有限公司 | Powder material pneumatic conveying device |
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