CN103754597B - The dedusting delivery system of loose unpacked material and carrying method - Google Patents
The dedusting delivery system of loose unpacked material and carrying method Download PDFInfo
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- CN103754597B CN103754597B CN201410026433.4A CN201410026433A CN103754597B CN 103754597 B CN103754597 B CN 103754597B CN 201410026433 A CN201410026433 A CN 201410026433A CN 103754597 B CN103754597 B CN 103754597B
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- 239000000463 material Substances 0.000 title claims abstract description 127
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000000428 dust Substances 0.000 claims abstract description 240
- 238000012546 transfer Methods 0.000 claims abstract description 85
- 230000007246 mechanism Effects 0.000 claims abstract description 37
- 239000003245 coal Substances 0.000 claims description 72
- 239000000843 powder Substances 0.000 claims description 56
- 238000007599 discharging Methods 0.000 claims description 35
- 239000013590 bulk material Substances 0.000 claims description 18
- 239000003077 lignite Substances 0.000 claims description 18
- 238000005086 pumping Methods 0.000 claims description 17
- 239000012778 molding material Substances 0.000 claims description 12
- 238000004200 deflagration Methods 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 9
- 238000007664 blowing Methods 0.000 claims description 8
- 238000000605 extraction Methods 0.000 claims description 8
- 238000012806 monitoring device Methods 0.000 claims description 8
- 238000003860 storage Methods 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims 1
- 238000000465 moulding Methods 0.000 abstract description 5
- 239000000203 mixture Substances 0.000 abstract 3
- 239000000284 extract Substances 0.000 abstract 1
- 239000002817 coal dust Substances 0.000 description 40
- 239000007789 gas Substances 0.000 description 20
- 230000008569 process Effects 0.000 description 14
- 238000002485 combustion reaction Methods 0.000 description 8
- 230000002269 spontaneous effect Effects 0.000 description 8
- 238000001035 drying Methods 0.000 description 5
- 239000004484 Briquette Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000002802 bituminous coal Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Abstract
The invention provides a kind of dedusting delivery system and carrying method of loose unpacked material.Dedusting delivery system comprises the conveying unit that at least one-level is arranged in order along mass transport path, and every grade of conveying unit comprises: the first conveyer, has the first feed end and the first discharge end; Second conveyor, is communicated with the first conveyer, and has for receiving from the second feed end of the material of the first conveyer and the second discharge end for material being exported this grade of conveying unit; The transfer point closed, the first discharge end of the first conveyer and the second feed end of second conveyor stretch into transfer point, and material is passed to the second feed end of second conveyor by the first discharge end in transfer point; Chou Chen mechanism, is communicated with transfer point inside and extracts transfer point out with the material dust that will kick up; Forming machine, and takes out dirt mechanism connection to receive and the dust that Chou Chen mechanism aspirates is shaped to moulding mixture, and forming machine is communicated with to carry moulding mixture further with second conveyor or independent moulding mixture feedway transfer point is outer.
Description
Technical Field
The invention relates to the technical field of material conveying, in particular to a dust removal conveying system and a dust removal conveying method for bulk materials.
Background
Bulk materials, particularly powdery materials, particularly coal, are always dusted in the conveying process, taking lignite as an example, brown coal resources in China are rich, and low-rank coal needs to be dried for reasonably utilizing the energy of the brown coal. However, a large amount of coal dust with the particle size smaller than 1mm can be generated in the lignite drying process, the coal dust is light in weight and good in activity, and the dust of a conveying system is very easy to cause serious dust emission in the conveying process, particularly in the transfer of a transfer station. A large amount of coal dust is accumulated in a coal conveying gallery and a transfer station, so that the visibility is reduced, the human health is seriously harmed, the surrounding environment is polluted, the coal dust is accumulated for a long time after deposition and is extremely easy to spontaneously combust, the serious potential safety hazard exists, and the coal dust is also wasted. Particularly, in large-scale industrial production, the conveying distance of dried product coal is long, and the requirement related to planar design in the period often needs to change the conveying direction through a plurality of transfer stations, so that the coal powder is repeatedly lifted each time the coal powder passes through the transfer stations. The existing general coal conveying system dust remover system has the following defects:
1. is not suitable for medium with higher inlet concentration, and generally requires the inlet concentration to be not higher than 10mg/m3The processed air quantity is not higher than 100000m3/h。
2. Is not suitable for the industries which are easy to raise dust, such as large-scale lignite drying and the like.
3. Most of the existing dust removal systems discharge collected coal dust to the coal conveying device again, can raise dust for the second time in the discharge process, and can raise the coal dust again when passing through the next transfer station, and the coal dust needs to be collected repeatedly.
4. Most of dust collectors of the existing coal conveying systems adopt a mechanical vibration mode to clean dust, the effect is poor, coal dust can be adsorbed on filter bags for a long time, and potential safety hazards such as spontaneous combustion and deflagration exist.
The existing dust removing device of the coal conveying system mostly adopts a flat bag dust remover, is suitable for high-quality power coal conveying systems such as clean coal, bituminous coal and the like in a thermal power plant, has small amount of coal dust carried in the coal, and has large specific gravity and difficult dust raising, so the dust raising amount is small in the transferring process. In industries such as lignite drying and upgrading and the like, because low-rank coal such as lignite is poor in thermal stability, the low-rank coal is very easy to pulverize in a drying and upgrading project, a large amount of dust-raising coal powder with the particle size smaller than 100 microns is often entrained in product coal and generally accounts for more than 20% of the total coal amount, and the coal powder is light in specific gravity and very easy to raise dust. Therefore, the coal conveying system is difficult to thoroughly solve the dust problem by adopting the traditional existing dust remover system.
Disclosure of Invention
The invention aims to provide a dust removal conveying system and a dust removal conveying method for bulk materials, which can remarkably reduce the dust concentration of a bulk material conveying system, particularly the environment of a coal conveying system.
In order to achieve the above object, according to one aspect of the present invention, there is provided a dust removing conveyor system for bulk materials, comprising at least one conveyor unit arranged in sequence along a material conveying path, wherein each conveyor unit comprises: a first conveyor having a first feed end and a first discharge end; the second conveyor is communicated with the first conveyor and is provided with a second feeding end for receiving the materials from the first conveyor and a second discharging end for outputting the materials out of the stage conveying unit; the first discharging end of the first conveyor and the second feeding end of the second conveyor respectively extend into the transfer station, and the first discharging end transfers the materials to the second feeding end of the second conveyor in the transfer station; the dust pumping mechanism is communicated with the interior of the transfer station and is used for pumping the raised material dust out of the transfer station; and the forming machine is communicated with the dust pumping mechanism to receive and form the dust pumped by the dust pumping mechanism into a molding material, and the forming machine is communicated with a second conveyor or a separate molding material conveying device outside the transfer station to further convey the formed molding material.
According to the dust removal conveying system for the bulk materials, the transfer station is communicated with the dust pumping mechanism, and the dust raising mechanism is communicated with the forming machine, so that when the bulk materials are conveyed from the first conveyor to the second conveyor in the transfer station, dust raised by the bulk materials is pumped out of the transfer station through the dust pumping mechanism and then enters the forming machine to be formed, and formed materials are formed, and therefore the formed materials are low in dust raising amount and even free of dust raising due to the fact that the formed materials are in a block shape, and the dust raising phenomenon in the bulk material conveying process is greatly reduced.
In a preferred embodiment, each stage of material conveying unit further comprises a buffer bin communicated between the dust extraction mechanism and the forming machine.
Preferably, the second conveyor has a receiving surface for receiving the material, and the dust extraction mechanism includes: the dust hood is arranged in the transfer station close to the receiving surface; the dust remover is arranged outside the transfer station and communicated with the dust hood so as to separate sucked dust from gas, the dust remover is provided with a gas outlet and a discharge port, and the discharge port of the dust remover is communicated with the buffer bin so as to convey the separated dust to the buffer bin; and the induced draft fan is communicated with the air outlet of the dust remover, the dust hood, the dust remover and the induced draft fan are sequentially communicated along the dust suction path, and the induced draft fan is used for exerting suction effect on the dust hood and the dust remover so as to generate negative pressure in the dust hood and the dust remover and discharge separated gas.
When the bulk material is conveyed from the first conveyor to the second conveyor in the using process, a large amount of generated dust is sucked by the draught fan to enable the dust hood and the dust remover to generate negative pressure, the dust is sucked into the dust remover and is separated from dust in the dust remover, the separated gas is sucked by the draught fan and is discharged, the separated dust enters the buffer bin and then enters the forming machine through the buffer bin to be formed, and due to the fact that the mode, a large amount of materials separated from the dust remover enter the buffer bin, excessive material powder cannot be accumulated, even almost no powder is accumulated, and the phenomena of spontaneous combustion, deflagration and the like caused by the fact that inflammable powder such as lignite and the like are attached to the filter bag in the dust remover for a long time are further prevented.
Preferably, each stage of the material conveying unit further comprises a discharging machine with an air locking function, and the discharging machine is communicated between the dust remover and the buffer bin to discharge the dust materials in the dust remover to the buffer bin. By adopting the system, the material is fed between the dust remover and the buffer bin through the discharging machine with the air locking function, so that the material separated from the dust remover can quickly enter the buffer bin, the dust remover is only used as a material circulation passage and cannot accumulate powder, and the potential safety hazards of spontaneous combustion, deflagration and the like of the material such as lignite and the like in the dust remover are effectively avoided.
In order to further prevent phenomena such as deflagration from taking place in the buffer bin, preferably, buffer bin intercommunication has the explosion-proof equipment that prevents that the material from taking place deflagration, and this explosion-proof equipment has the stand-off that communicates at buffer bin top.
Preferably, the lower part of the side wall of the buffer bin and the powder discharge port of the buffer bin are provided with accident powder discharge devices with a powder discharge function at intervals, and a powder material level monitoring device is arranged in the buffer bin and matched with the accident powder discharge devices so as to discharge powder through the accident powder discharge devices when the material level is higher than the set highest material level to control the material level within the set range.
By adopting the system, when excessive materials accumulated in the buffer bin exceed the set highest height in case of an accident, the powder material level monitoring device can send a signal, the system controls the accident powder discharging device to discharge powder after receiving the signal, or an operator opens the accident powder discharging device to discharge powder after receiving the signal, so that the powder amount in the buffer bin is controlled within a safe set range, and the safety of the system is further ensured.
Preferably, the dust removal conveying system for the bulk materials further comprises a blanking pipe which is communicated between the first discharging end and the second feeding end, the materials are conveyed from the first conveyor to the second conveyor through the blanking pipe, and the dust removal conveying system for the bulk materials further comprises a dust blowing treatment device which is arranged at the blanking pipe and is used for separating powder in the conveyed bulk materials from the molding materials.
Preferably, the dedusting conveying system for bulk materials comprises a plurality of stages of material conveying units, wherein the second conveyor of the previous stage of material conveying unit forms a first conveyor which is connected with the next stage of material conveying unit, and the second conveyor of the next stage of material conveying unit forms a first conveyor which is connected with the next stage of material conveying unit.
Preferably, the material is lignite.
According to another aspect of the present invention, there is provided a method of bulk material conveying for material conveying using the above-described dust extraction conveying system for bulk material, the method comprising:
the first conveyor conveys bulk material to the second conveyor within the closed transfer station while dust is sucked out of the transfer station by means of the suction mechanism;
-conveying the dust sucked into the suction mechanism into a forming machine for forming into a profile;
-transporting the formed profile through the conveyor unit of that stage to the next conveyor unit or through a separate profile transport device to a storage station.
Therefore, the dust removal conveying system and the conveying method of the bulk materials of the invention have the advantages that the transfer station is communicated with the dust pumping mechanism, and the dust raising mechanism is communicated with the forming machine, so that when the bulk materials are conveyed from the first conveyor to the second conveyor in the transfer station, dust raised by the bulk materials is pumped out of the transfer station through the dust pumping mechanism and then enters the forming machine for forming treatment of the formed materials, and the formed materials have small amount of raised dust even have no raised dust because of being in a block shape, so the dust raising phenomenon in the bulk material conveying process is greatly reduced.
Drawings
Embodiments of the invention are described in detail below with reference to the attached drawing figures, wherein:
fig. 1 is a schematic structural diagram of a dedusting conveying system for bulk materials.
Detailed Description
As shown in fig. 1, the dust-removing conveying system for bulk materials of this embodiment includes multiple stages of conveying units arranged in sequence along a material conveying path, and each stage of conveying unit includes a closed first conveyor 1, a closed second conveyor 9, a closed transfer station, a dust-removing mechanism, and a forming machine 7. Wherein the first conveyor 1 has a first feed end and a first discharge end. The second conveyor 9 is in communication with the first conveyor 1 and has a second feed end for receiving material from the first conveyor 1 and a second discharge end for discharging material out of the conveyor unit. The first discharge end of the first conveyor 1 and the second feed end of the second conveyor 9 extend into the transfer station respectively, and the first discharge end transfers the material to the second feed end of the second conveyor 9 in the transfer station. The dust pumping mechanism is communicated with the inside of the transfer station so as to pump the raised material dust out of the transfer station. The forming machine 7 is communicated with the dust pumping mechanism to receive and form the dust pumped by the dust pumping mechanism into the molding material, and the forming machine 7 is communicated with the second conveyor 9 or a separate molding material conveying device outside the transfer station to further convey the formed molding material. Wherein, the second conveyor 9 of the previous-stage material conveying unit forms the first conveyor 1 connected with the next-stage material conveying unit, and the second conveyor 9 of the next-stage material conveying unit forms the first conveyor 1 connected with the next-stage material conveying unit. Of course, it should be understood that the present embodiment may have only one primary feeding unit without departing from the scope of the present invention.
The dust removal conveying system for the bulk materials in the embodiment is characterized in that the transfer station is communicated with the dust pumping mechanism, and the dust raising mechanism is communicated with the forming machine 7, so that when the bulk materials are conveyed from the first conveyor 1 to the second conveyor 9 in the transfer station, dust raised by the bulk materials is pumped out of the transfer station through the dust pumping mechanism and then enters the forming machine 7 to be formed, and the formed bulk materials are formed, so that the formed bulk materials are very small in block dust raising amount and even free of dust raising, the dust raising phenomenon in the conveying process of the bulk materials is greatly reduced, the environmental pollution is reduced, and the potential safety hazard is eliminated.
As a preferred embodiment, the second conveyor 9 in this embodiment has a receiving surface for receiving the material, and the dust suction mechanism includes a dust hood 3 disposed in the transfer station near the receiving surface, a dust remover 4 disposed outside the transfer station and communicating with the dust hood 3, and an induced draft fan 5 communicating with an air outlet of the dust remover 4. The dust remover 4 is used for separating sucked dust from gas, the dust remover 4 is provided with a gas outlet and a discharge port, and the discharge port of the dust remover 4 is communicated with the forming machine 7 so as to convey the separated dust to the forming machine 7. The suction hood 3, the dust remover 4 and the induced draft fan 5 are communicated in sequence along a dust suction path, and the induced draft fan 5 is used for exerting suction effect on the suction hood 3 and the dust remover 4 so as to generate negative pressure in the suction hood 3 and the dust remover 4 and discharge separated gas.
Preferably, each stage of the feeding unit further comprises a buffer bin 10 communicated between the discharge port of the dust remover 4 and the forming machine 7. Preferably, the dust collector 4 is a bag collector 4, and the bag collector 4 comprises a dust collector body with a hopper and a low-pressure gas blowback mechanism for blowing dust in the dust collector 4 to the hopper of the dust collector 4. The buffer bin 10 is preferably arranged in a conical shape, and is subjected to chamfering treatment or is additionally provided with an arc plate at a corner, the included angle between the side wall of the buffer bin 10 and the horizontal plane is preferably larger than 70 degrees, so that materials can be output quickly, and preferably no horizontal structures exist in the dust remover 4 and the buffer bin 10 so as to accumulate dust.
In the use process of the embodiment, when bulk materials are conveyed from the first conveyor 1 to the second conveyor 9, a large amount of generated dust is sucked by the draught fan 5 to enable the dust hood 3 and the dust remover 4 to generate negative pressure, the dust is sucked into the dust remover 4 and is separated from dust in the dust remover 4, the separated gas is sucked away and discharged by the draught fan 5, the separated dust enters the buffer bin 10 and then enters the forming machine 7 through the buffer bin 10 to be formed, and by adopting the mode, the separated materials in the dust remover 4 enter the buffer bin 10 in large amount, so that excessive material powder cannot be accumulated, even the powder is hardly accumulated, and the phenomena of spontaneous combustion, deflagration and the like caused by that combustible powder such as brown coal and the like are attached to a filter bag in the dust remover 4 for a long time are further prevented.
Preferably, each stage of the material conveying unit further comprises a discharging machine 6 with an air locking function, which is communicated between the dust remover 4 and the buffer bin 10 to discharge the dust material in the dust remover 4 to the buffer bin 10. By adopting the system of the embodiment, as the material is fed by the discharging machine 6 with the air locking function between the dust remover 4 and the buffer bin 10, the material separated from the dust remover 4 can rapidly enter the buffer bin 10, and the dust remover 4 is only used as a material circulation passage and can not accumulate powder, thereby effectively avoiding the potential safety hazards of spontaneous combustion, deflagration and the like of the material such as lignite and the like in the dust remover 4. The discharger 6 may be a star-type discharge valve, a flap valve, or the like having a gas lock function, for example.
In order to further prevent the phenomenon of deflagration and the like in the buffer bin, the buffer bin 10 is preferably communicated with an explosion-proof device (not shown) for preventing the deflagration of the materials, and the explosion-proof device is provided with an outlet pipe (not shown) communicated with the top of the buffer bin 10. The angle between the outlet pipe of the explosion-proof device and the top of the buffer bin 10 is preferably greater than or equal to 70 degrees, so as to further prevent dust accumulation on the outlet pipe.
In order to control the level height in the surge bin 10, it is preferred that the highest level value allowed by safety is provided in the surge bin 10, and a suitable low level value is also provided, and a powder level monitoring device (not shown) is provided, which includes a high level monitoring device and a low level monitoring device. Preferably, an accident powder discharging device (not shown) having a powder discharging function is further provided at a lower portion of the side wall of the buffer bin 10 spaced from the powder discharging port thereof to discharge powder through the accident powder discharging device when the material level is higher than a set maximum material level so as to control the material level within a set range. In the embodiment, the accident powder discharging device is arranged, so that the pulverized coal is quickly discharged in the accident state, the storage time of the pulverized coal in the buffer bin 10 is less than 1 hour, the powder discharging speed is greatly increased, and the system safety is ensured.
By adopting the system of the embodiment, after the high material level monitoring device monitors that the material level in the buffer bin 10 is higher than the allowed highest material level, the control system sends a signal to the system, and the control system controls the accident powder discharging device to discharge powder so as to control the material level between the highest material level value and the low material level value, thereby ensuring the safety. Of course, the powder material level monitoring device can also inform an operator by giving out alarms such as sound and the like so as to operate the accident powder discharging device to discharge powder after the operator receives the alarms.
Preferably, the buffer bin 10 is further communicated with an inert gas protection mechanism (not shown) for filling inert gas into the buffer bin 10, and the buffer bin 10 is communicated with the forming machine 7 through a powder discharge device with an air locking function.
Preferably, the dust-removing conveying system for bulk materials further comprises a blanking pipe 2 which is communicated between the first discharging end and the second feeding end, and materials are conveyed from the first conveyor 1 to the second conveyor 9 through the blanking pipe 2. The suction hood 3 is preferably arranged close to the material outlet of the down pipe 2 and the receiving surface of the second conveyor 9. The dust removal conveying system for the bulk materials further comprises a dust blowing treatment device arranged at the blanking pipe 2 so as to separate powder in the conveyed bulk materials from the molding materials. Preferably, the dust blowing treatment device is a winnowing device or a ventilation disturbance device, so that all the coal dust mixed with the product coal is blown out at the first transfer station or the first and second transfer stations in a manner of additionally arranging winnowing, ventilation disturbance and the like at the blanking pipe position of the first transfer station, and then the coal dust is collected into an integrated type, so that no serious dust blowing occurs at the subsequent transfer stations due to no coal dust, the dust removal efficiency is greatly improved, and the cost is saved.
The invention also provides a method for conveying bulk material, which is used for conveying the bulk material by using the dust removal conveying system for the bulk material, and comprises the following steps:
the first conveyor 1 conveys the bulk material to the second conveyor 9 in a closed transfer station while dust is sucked out of the transfer station by means of a suction mechanism;
conveying the dust sucked into the suction mechanism into a forming machine 7 to form a profile;
-transporting the formed profile through the conveyor unit of that stage to the next conveyor unit or through a separate profile transport device to a storage station.
In order to better explain the invention, the lignite drying industry will be taken as an example to further describe the invention.
Therefore, the invention provides a dust removal conveying system for bulk materials capable of solving the problem of coal dust emission, which comprises the following structures and steps:
(1) conveying the product coal dried from the reactor to each transfer station by a closed first conveyor 1;
(2) each transfer station is independently provided with a set of coal dust collecting-forming system, which comprises a dust hood 3, a dust absorption pipeline, a bag type dust collector, a forming machine 7, an induced draft fan 5, a discharging machine 6, a control system and the like;
(3) under the action of a draught fan 5, the coal dust raised in the transportation process of the product coal generates negative pressure near the dust hood 3, and the raised coal dust is sucked into a dust collection pipeline and enters a bag type dust collector (or also called a coal dust collector);
(4) the coal dust collected by the coal dust collector is sent to a buffer hopper 10 at the top of a forming machine 7 through a discharging machine 6 with an air locking function, and the coal dust is uniformly sent to the forming machine 7 by adopting a quantitative feeding device at the bottom of the buffer hopper 10;
(5) the coal powder entering the forming machine 7 is punched to form the coal briquette 8 with certain shape and cold strength, and the coal briquette 8 is sent to a product coal yard through a discharging device.
The first conveyor 1 and the second conveyor 9 in this embodiment may be buried scraper conveyors or belt conveyors with sealing devices, and the purpose is to prevent the product coal from being directly exposed to the outside, avoid raising dust and wind and rain during the conveying process, and at the same time, make the whole dust removal conveying system airtight, enhance the dust collection ability of the dust collection cover 3, and make the inside of the dust removal conveying system generate a certain negative pressure to prevent the coal dust from raising and overflowing to pollute the environment.
Preferably, the length of the blanking pipe 2 in the transfer station is not less than 2 meters from the receiving surface of the second conveyor 9, preferably, a curved blanking pipe or a straight cylinder pipe with a certain inclination is adopted, and the included angle between the central line of the blanking pipe 2 and the receiving surface of the second conveyor 9 is not less than 45 degrees and not more than 80 degrees, so that the coal flow direction is consistent with the running direction of the second conveyor 9, the induced wind is weakened, the dust raising point moves forwards, and the dust collection effect of the dust collection cover 3 is enhanced.
Preferably, the dust hood 3 is arranged at a position downstream of the conveying of the blanking pipe 2, an upstream end of the dust hood 3 along the conveying of the materials is connected with a downstream end of the blanking pipe 2, and the length of the dust hood 3 is not less than 2 meters.
Preferably, the dust suction pipeline between the dust suction hood 3 and the bag type dust collector has no horizontal section to prevent spontaneous combustion of coal dust deposition, and the included angle between the connection part of the dust suction pipeline and the bag type dust collector is not less than 30 degrees to increase the conveying speed. The gas flow rate in the tube is preferably controlled to 15 to 30 m/s.
Preferably, the bag type dust collector (coal dust collector) is a pulse bag type dust collector, and the interior of the bag type dust collector preferably does not have any dead angle so as to prevent coal dust from accumulating and spontaneous combustion.
Preferably, the forming machine 7 is a stamping forming machine (forming pressure is not less than 250 t), the technology adopts a binderless high-pressure forming technology, the forming rate is not less than 99.9 percent, and the cold strength of the molded coal 8 is not less than 500N. Of course, other types of equipment such as a double-roller forming machine can be adopted, and only the sieving and circulating secondary forming machine for the unshaped pulverized coal needs to be additionally arranged.
After the coal dust is molded into the molded coal 8 in the molding machine 7, the molded coal 8 is conveyed in two ways: one is that the molded coal 8 is directly sent to a finished coal conveying device and is sent to a coal yard after being mixed with the finished coal; and the other is that the molded coal 8 at each transfer station is separately conveyed to a coal yard through a coal conveying device to be used as another product coal.
Compared with the traditional dust removal system for transfer stations, the dust removal system for transfer stations adopts the collection-forming integrated distributed negative pressure dust removal technology at each transfer station, so that raised coal powder can be directly formed into molded coal by punching after collection, the state of the coal powder is fundamentally solved at one time, repeated collection and repeated pollution in the transfer process are avoided, the molded coal subjected to pressing forming cannot pollute the environment again due to dust raising in secondary transfer or reverse transfer, and meanwhile, the spontaneous combustion tendency is greatly reduced.
Compared with the centralized collection and treatment system for the raised dust of each transfer station, the pulverized coal of each raised dust point is generally conveyed to a collector through a long distance, so that the horizontal section of the conveying pipeline is difficult to avoid, the accumulated powder is easy to generate once the horizontal section is generated, then the accidents such as pipeline deflagration are generated, the distances of the transfer points are inconsistent, and the dust removal effect of each dust absorption point is difficult to guarantee. The invention has short coal powder conveying distance, quickly changes the coal powder into the molded coal at each transfer point, and then intensively conveys the molded coal, thereby eliminating the potential safety hazard caused by long-distance conveying of the coal powder and better controlling and ensuring the dust removal effect of each dust suction point. In addition, the pulverized coal is collected and then pressed into the molded coal, so that the market channel of the product is further widened, and the dust flying condition during subsequent transportation and product user use and transportation is eliminated or reduced from the source.
In one embodiment, as shown in fig. 1, the dried lignite is sent to the # 1 transfer station via the closed first conveyor 1 and falls on the closed second conveyor 9 via the down pipe 2. In the transferring process, due to the falling and the effect of induced wind in the pipe, when the dried lignite falls on the second conveyor 9, dust can be generated at the outlet of the blanking pipe 2, and the raised pulverized coal enters the pulse bag type dust collector from the dust hood 3 through the negative pressure generated by the induced draft fan 5.
The pulse bag type dust collector comprises a bag type dust collector body and a low-pressure gas back flushing system, so that the coal dust contained in the fluid is collected, and the fluid is purified. The low-pressure gas back-blowing system (not shown in the figure) uses low-pressure air or nitrogen as back-blowing gas to blow the collected coal dust down to a hopper at the bottom of the bag type dust collector. The purified gas is discharged from the induced draft fan 5.
An air inlet of the draught fan 5 is communicated with the bag type dust collector, and the draught fan 5 is used for generating negative pressure in the dust hood 3 and the bag type dust collector to ensure that all lifted coal dust is sucked into the bag type dust collector.
The coal dust falling into the hopper at the bottom of the bag type dust collector enters a buffer bin 10 at the upper part of a forming machine 7 through a discharging machine 6, and the forming machine 7 presses the coal dust into the molded coal 8 with certain shape and strength.
The discharging machine 6 is a conventional star-shaped discharging valve, flap valve and other equipment with a gas locking function.
The forming machine 7 is a stamping forming machine, and adopts a binderless high-pressure forming technology, so that the forming rate is not less than 99.9 percent, and the cold strength of the molded coal is not less than 500N.
The pressed briquette 8 falls directly on the second conveyor 9 and is sent to the next transfer station or coal yard.
In another embodiment of the invention, the molded coal 8 pressed by each transfer station can be dispersed and independently used as another product to be stored in each transfer station, and finally, the molded coal 8 in all the transfer stations are uniformly collected and stored together; or the coal can be uniformly and intensively conveyed to a coal yard through a belt conveyor to be stored separately.
Example 1
1. The dried lignite is conveyed to a No. 1 transfer station through a closed first conveyor 1 and falls on a closed second conveyor 9 through a blanking pipe 2.
2. The coal dust raised at the outlet of the blanking pipe 2 enters the pulse bag type dust collector from the dust hood 3 along with the negative pressure gas generated by the draught fan 5.
3. The collected coal dust falls into a hopper at the bottom of the bag type dust collector, and the purified gas is discharged from the induced draft fan 5.
4. The coal dust falling into the hopper at the bottom of the bag type dust collector enters a buffer bin 10 at the upper part of a forming machine 7 through a discharging machine 6, and the forming machine 7 presses the coal dust into the molded coal 8 with certain shape and strength.
5. The pressed briquette 8 falls directly on the second conveyor 9 and is sent to the next transfer station or coal yard.
Example 2
1. The dried lignite is conveyed to a No. 1 transfer station through a closed first conveyor 1 and falls on a closed second conveyor 9 through a blanking pipe 2.
2. The coal dust raised at the outlet of the blanking pipe 2 enters the pulse bag type dust collector from the dust hood 3 along with the negative pressure gas generated by the draught fan 5.
3. The collected coal dust falls into a hopper at the bottom of the bag type dust collector, and the purified gas is discharged from the induced draft fan 5.
4. The coal dust falling into the hopper at the bottom of the bag type dust collector enters a buffer bin 10 at the upper part of a forming machine 7 through a discharging machine 6, and the forming machine 7 presses the coal dust into the molded coal 8 with certain shape and strength.
5. The molded coal 8 pressed at the No. 1 transfer station, the molded coal 8 pressed at the No. 2 transfer station and other transfer stations are uniformly delivered to a coal yard by a belt conveyor.
In summary, according to the dust removal conveying system and the conveying method for bulk materials, the transfer station is communicated with the dust pumping mechanism, and the dust raising mechanism is communicated with the forming machine 7, so that when the bulk materials are conveyed from the first conveyor 1 to the second conveyor 9 in the transfer station, dust raised by the bulk materials is pumped out of the transfer station through the dust pumping mechanism and then enters the forming machine 7 to be formed, and formed materials are formed, so that the formed materials have small block dust raising amount or even have no dust raising, and the dust raising phenomenon in the bulk material conveying process is greatly reduced.
Having described embodiments of the present invention, various alterations, modifications and improvements will readily occur to those skilled in the art to which the invention pertains. For example, an induced draft fan, a bag type dust collector and a molding machine with different output can be selected in consideration of the dust amount. The invention can be implemented at a certain transfer station, or the invention can be implemented at the first transfer stations, and after the coal dust in the finished coal is collected and formed by the transfer stations, the dust can not be collected and formed any more when the dust raising amount is very small. Accordingly, the foregoing description is by way of example only and is not intended as limiting.
Claims (10)
1. The utility model provides a dust removal conveying system of bulk material, includes the defeated material unit that at least one-level arranged in proper order along the material transport route, its characterized in that, every level defeated material unit includes:
a first conveyor (1) having a first feed end and a first discharge end;
the second conveyor (9) is communicated with the first conveyor (1) and is provided with a second feeding end for receiving the materials from the first conveyor (1) and a second discharging end for outputting the materials out of the conveying unit;
a closed transfer station into which a first discharge end of the first conveyor (1) and a second feed end of the second conveyor (9) each project, the first discharge end transferring material within the transfer station to the second feed end of the second conveyor (9);
the dust pumping mechanism is communicated with the interior of the transfer station and is used for pumping the raised material dust out of the transfer station;
the forming machine (7) is communicated with the dust extraction mechanism to receive and form the dust extracted by the dust extraction mechanism into a molding material, and the forming machine (7) is communicated with the second conveyor (9) or a separate molding material conveying device outside the transfer station to further convey the formed molding material; and
the blanking pipe (2) is a curved coal blanking pipe or a straight-through pipe with a certain inclination; wherein,
the second conveyor (9) is provided with a receiving surface for receiving materials, and the dust extraction mechanism comprises a dust hood (3) which is arranged in the transfer station close to the receiving surface.
2. The system according to claim 1, characterized in that each stage of said delivery unit further comprises a buffer bin (10) communicating between said dust extraction means and said forming machine (7).
3. The system of claim 2, wherein the dust extraction mechanism further comprises:
the dust remover (4) is arranged outside the transfer station and communicated with the dust hood (3) to separate sucked dust from gas, the dust remover (4) is provided with a gas outlet and a discharge hole, and the discharge hole of the dust remover (4) is communicated with the buffer bin (10) to convey the separated dust to the buffer bin (10); and
with draught fan (5) of the air outlet intercommunication of dust remover (4), suction hood (3) dust remover (4) and draught fan (5) communicate in proper order along dust suction path, draught fan (5) are used for right suction hood (3) with dust remover (4) are applyed with the suction effect, in order suction hood (3) with produce the negative pressure in dust remover (4) for the gas of discharge separation.
4. A system according to claim 3, characterized in that the feed unit of each stage further comprises a discharger (6) with air lock function, which communicates between the dust separator (4) and the buffer bin (10) to discharge the dust material in the dust separator (4) to the buffer bin (10).
5. The system according to claim 2, characterized in that the surge bin (10) is connected to an explosion-proof device for preventing deflagration of the material, which has an outlet pipe connected to the top of the surge bin (10).
6. The system according to claim 2, characterized in that the lower part of the side wall of the buffer bin (10) is provided with an accident powder discharging device with a powder discharging function at an interval with a powder discharging port thereof, and a powder material level monitoring device is arranged in the buffer bin (10) to cooperate with the accident powder discharging device so as to discharge powder through the accident powder discharging device to control the material level within a set range when the material level is higher than a set highest material level.
7. The system according to claim 1, characterized in that the down pipe (2) communicates between the first discharge end and the second feed end, material is conveyed from the first conveyor (1) to the second conveyor (9) through the down pipe (2), and the dust-removing conveying system for bulk material further comprises a dust-blowing treatment device arranged at the down pipe (2) to separate powder in the conveyed bulk material from the molding material.
8. A system according to claim 1, characterized in that said dust-removing conveying system for bulk materials comprises a plurality of stages of said conveyor units, the second conveyor (9) of a preceding conveyor unit constituting the first conveyor (1) following a succeeding conveyor unit, the second conveyor (9) of said succeeding conveyor unit constituting the first conveyor (1) following a succeeding conveyor unit.
9. The system according to any one of claims 1 to 8, wherein the material is lignite.
10. A method for bulk material conveying for material conveying with a dust-catcher conveying system for bulk material according to any one of claims 1 to 9, the method comprising:
-the first conveyor (1) conveys bulk material to the second conveyor (9) in a closed transfer station while dust is sucked out of the transfer station by means of a suction mechanism;
-conveying the dust sucked into the suction means into a forming machine (7) for forming into a profile;
-transporting the formed profile through the conveyor unit of that stage to the next conveyor unit or through a separate profile transport device to a storage station.
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| CN201410026433.4A CN103754597B (en) | 2014-01-21 | 2014-01-21 | The dedusting delivery system of loose unpacked material and carrying method |
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| CN201410026433.4A CN103754597B (en) | 2014-01-21 | 2014-01-21 | The dedusting delivery system of loose unpacked material and carrying method |
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| CN108382874B (en) * | 2018-05-07 | 2024-08-06 | 广东致顺化工环保设备有限公司 | Tandem type feeding device |
| CN109467305A (en) * | 2019-01-15 | 2019-03-15 | 中国建材国际工程集团有限公司 | It is a kind of gather dust after glass powder recyclable device |
| CN111285042A (en) * | 2019-08-23 | 2020-06-16 | 焦作科瑞森重装股份有限公司 | Ultra-remote conveying method and system for aluminum oxide |
| CN111646100A (en) * | 2019-11-25 | 2020-09-11 | 泰富重工制造有限公司 | Power supply system for long-distance belt conveyor |
| CN114871243B (en) * | 2022-07-11 | 2022-09-27 | 唐山神州机械集团有限公司 | Container formula material recovery processing system |
| CN115193200B (en) * | 2022-07-11 | 2023-11-24 | 唐山神州机械集团有限公司 | Movable intelligent powdery material recycling station |
| CN115193529B (en) * | 2022-07-15 | 2024-05-07 | 国家电投集团东北电力有限公司抚顺热电分公司 | Material conveying equipment for coal crushing and working method thereof |
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| FR2640244A1 (en) * | 1988-12-08 | 1990-06-15 | Marquis Sarl | Scraper for cleaning underneath belt conveyors |
| JPH10218341A (en) * | 1997-02-10 | 1998-08-18 | Ishikawajima Harima Heavy Ind Co Ltd | Method and device for preventing adhesion of dust to belt conveyor |
| CN101992944A (en) * | 2009-08-28 | 2011-03-30 | 于文祥 | Belt fall point dust removal system |
| CN201520544U (en) * | 2009-09-30 | 2010-07-07 | 无锡市华能电力机械有限公司 | Negative pressure dust control device of vibration feeder |
| CN102060173A (en) * | 2009-11-17 | 2011-05-18 | 贵阳铝镁设计研究院 | Transferring system for discharging ash of dust collector behind crushing sieving station of gas station of generation furnace |
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