CN111591768A - Method for pneumatic conveying and dust removal of starch and dust explosion-proof system - Google Patents
Method for pneumatic conveying and dust removal of starch and dust explosion-proof system Download PDFInfo
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- CN111591768A CN111591768A CN202010444174.2A CN202010444174A CN111591768A CN 111591768 A CN111591768 A CN 111591768A CN 202010444174 A CN202010444174 A CN 202010444174A CN 111591768 A CN111591768 A CN 111591768A
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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
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0084—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours provided with safety means
- B01D46/0086—Filter condition indicators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0084—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours provided with safety means
- B01D46/0091—Including arrangements for environmental or personal protection
- B01D46/0093—Including arrangements for environmental or personal protection against fire or explosion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/44—Auxiliary equipment or operation thereof controlling filtration
- B01D46/446—Auxiliary equipment or operation thereof controlling filtration by pressure measuring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/44—Auxiliary equipment or operation thereof controlling filtration
- B01D46/448—Auxiliary equipment or operation thereof controlling filtration by temperature measuring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/44—Auxiliary equipment or operation thereof controlling filtration
- B01D46/46—Auxiliary equipment or operation thereof controlling filtration automatic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/22—Safety features
- B65D90/32—Arrangements for preventing, or minimising the effect of, excessive or insufficient pressure
- B65D90/325—Arrangements for preventing, or minimising the effect of, excessive or insufficient pressure due to explosion, e.g. inside the container
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/48—Arrangements of indicating or measuring devices
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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
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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
- B65G53/36—Arrangements of containers
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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
- B65G53/40—Feeding or discharging devices
- B65G53/46—Gates or sluices, e.g. rotary wheels
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
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Abstract
The invention discloses a method for pneumatic conveying and dust removal of starch and a dust explosion-proof system. The system and the method can realize automatic detection of pressure, temperature and spark, and find out equipment failure and dust burning and explosion risks in time; automatic waterfall discharge and explosion suppression are realized, a series of safety interlocking and shutdown are performed, the influence range of dust combustion and explosion danger is reduced, and the safety production reliability is ensured; the feeding and discharging are automatic, so that the operation continuity of a process system is ensured; the operation safety and the operation continuity of the starch pneumatic conveying device and the dedusting equipment thereof are improved.
Description
Technical Field
The invention relates to the technical field of medicine and food production, in particular to a method for pneumatic conveying and dust removal of starch and a dust explosion-proof system.
Background
Starch has wide application in the fields of medicine and food production, such as fermentation production by taking starch as a raw material, imparting a certain dosage form to medicines by taking starch as a filler or an adhesive, and production of food by taking starch as an additive. In the industrial production process, the transportation of starch can be divided into mechanical transportation and pneumatic transportation. Mechanical conveying comprises bucket elevator conveying and scraper conveyor conveying, and is widely applied to the grain and feed industries at present. The pneumatic conveying is an important powder transferring mode because of the advantages of high automation degree, small occupied area, easy control of dust and the like.
Starch is combustible powder and has dust explosion danger, nitrogen is usually adopted as an air source for pneumatic conveying in the production process of small batches, and tail gas after conveying is subjected to dust removal and pressurization treatment and is reused as the air source, so that the recycling is realized. For large-batch industrial production, more process equipment is involved, the flow is complex, if nitrogen is still used as a gas source, the gas consumption is high, the nitrogen needs to be continuously supplemented, and the equipment operation cost is also high. Therefore, air transportation is also one of the ways still in use in the industry at present, and the dust explosion prevention measure of air transportation starch is an important research subject correspondingly. At present, much research on pneumatic conveying of starch focuses on conveying capacity and design in a process flow, such as a pneumatic conveying system of flour (application number: CN201310460332.3), but the design of dust explosion prevention measures is less.
In the actual production, the conditions to be considered for the starch pneumatic conveying device and the dust explosion-proof system of the dust removal equipment are as follows: firstly, when dust combustion and dust explosion occur, the waterfall is timely performed; secondly, when dust burning and dust explosion occur, an explosion-proof device is arranged to prevent the burning and the explosion from being transmitted to adjacent equipment; thirdly, a pressure and temperature transmitter is arranged in the system, so that the pressure and temperature in the system are found out in time, and the abnormal working condition is prevented from further developing into dangers such as dust combustion or dust explosion; fourthly, unloading is automatic, and the whole system is stopped in time when the unloading fails; fifthly, the safety integrity is considered, and a safety system is formed by pressure detection, temperature detection, spark detection, explosion suppression measures, waterfall measures, fault detection and the like, so that the safety of the system is guaranteed in all directions.
Disclosure of Invention
The invention aims to solve the dust explosion-proof problem when air is used as an air source to convey starch in the prior art, and provides a method for pneumatic conveying and dust removal of starch and a dust explosion-proof system.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for pneumatic conveying and dust removal of starch, which adopts a dust explosion-proof system for pneumatic conveying and dust removal of starch, and comprises the following steps:
s1, start-up step: air enters the system from a material pipeline through an air blower and a pipeline type magnetic filter, and waste gas passing through a bag type dust collector enters a subsequent induced draft fan through a waste gas pipeline of the bag type dust collector;
s2, working procedure: unpacking the materials, putting the unpacked materials into a feeding station with a micro-negative pressure environment, enabling the unpacked materials to enter a conveying system through a first rotary valve, recovering most of the materials to a storage bin for storage under the action of a filtering device, enabling the materials to enter a subsequent process through a second rotary valve, and enabling a small part of starch to leave the filtering device along with waste gas to enter a subsequent dust removal process;
s3, a dust removal process: in the S2, the waste gas leaving the filtering device enters a bag type dust collector through a bin waste gas pipeline for dust removal, the ash obtained by dust removal is collected through a third rotary valve, and meanwhile, the waste gas after dust removal enters a subsequent induced draft fan through a bag type dust collector waste gas pipeline and is safely discharged;
wherein, the waterfall measure is:
the storage bin is provided with a flameless waterfall discharge device for discharging dust explosion of the storage bin;
the bag type dust collector is provided with an explosion venting device for the explosion venting of dust of the bag type dust collector;
the flameless waterfall discharging device and the explosion discharging device are provided with state signals, and when the flameless waterfall discharging device and the explosion discharging device act, the chemical explosion-proof device is started, and the whole conveying and dust removing system is safely interlocked and stopped;
wherein, the flame proof measure does:
the air pipeline is provided with a one-way passive explosion-proof valve for transmitting dust explosion in the storage bin to an air source;
the chemical explosion-proof device is arranged on the bin waste gas pipeline and is used for preventing dust explosion in the bin from spreading to the bag type dust collector and preventing dust explosion in the bag type dust collector from spreading to the bin;
the bag type dust collector waste gas pipeline is provided with a bidirectional passive explosion-proof valve which is used for isolating dust explosion between a dust collection system and a subsequent induced draft fan;
when the chemical explosion-proof device acts, the whole conveying and dust removing system is safely interlocked and stopped;
the one-way passive explosion-proof valve and the two-way passive explosion-proof valve are provided with state signals, and the whole conveying and dust removing system is safely interlocked and stopped when the two-way passive explosion-proof valve acts.
Further, the automatic control measures of the method comprise the following steps:
a first pressure transmitter and/or a first temperature transmitter are/is arranged above the storage bin, and if the temperature and/or the pressure exceed a preset range, the chemical explosion-proof device is closed;
a second temperature transmitter is arranged at the hopper below the storage bin, and if the temperature on the hopper exceeds a preset range, the second temperature transmitter gives an alarm, starts the explosion-proof measures in a linkage manner and stops the operation;
a third temperature transmitter is arranged on the waste gas pipeline of the storage bin, and when the temperature exceeds a set value, the chemical explosion-proof device is closed;
a pressure difference transmitter is arranged between the air inlet and the air outlet of the bag type dust collector, when the pressure change of the inlet and the outlet of the bag type dust collector is larger than an allowable value 1, an audible and visual alarm signal is sent out, and when the pressure change of the inlet and the outlet of the bag type dust collector is larger than an allowable value 2, the whole conveying system and the dust removing system are safely interlocked and shut down;
a fourth temperature transmitter is arranged at the hopper below the bag type dust collector, and if the temperature on the hopper exceeds a preset range, the fourth temperature transmitter gives an alarm, starts the explosion-proof measures in a linkage manner and stops the operation;
a second pressure transmitter is arranged on the back-blowing gas pipeline of the bag type dust collector, and an alarm is given if the pressure is lower than a preset range;
throw the material station bottom and be equipped with first rotary valve, feed bin bottom and be equipped with the second rotary valve, bag collector is equipped with the third rotary valve for automatic discharge, when the rotary valve trouble of unloading, carry out safety interlock and shut down to whole transport and dust pelletizing system.
Further, before the method is operated, each operation is preset in the control system, and the whole operation process is started manually.
The second aspect of the invention provides a dust explosion-proof system for starch pneumatic transmission and dust removal, which is applied to the method for starch pneumatic transmission and dust removal, and comprises the following steps:
the starch pneumatic conveying system comprises an air pipeline, a feeding station, a material pipeline, a storage bin and a storage bin waste gas pipeline, wherein an air blower and a one-way passive explosion-proof valve are sequentially arranged on the air pipeline, and finally the air pipeline is communicated with a discharge port at the bottom of the feeding station and led out of the material pipeline; the material pipeline is communicated with the storage bin; the top of the storage bin is provided with a filtering device, and one end of the filtering device is communicated with the waste gas pipeline of the storage bin;
the top of the storage bin is also provided with a flameless waterfall leakage device, a first pressure transmitter and/or a first temperature transmitter is/are arranged above the storage bin, a second temperature transmitter is arranged at the position of the lower hopper, and a second rotary valve is arranged at the bottom of the storage bin;
the dust removal system comprises a bag type dust remover, wherein the air inlet end of the bag type dust remover is communicated with the starch pneumatic conveying system through a bin waste gas pipeline, and the air outlet end of the bag type dust remover is connected with a bag type dust remover waste gas pipeline; a chemical explosion-proof device and a third temperature transmitter are sequentially arranged on one side of the dust removal system on the bin waste gas pipeline; the bag type dust collector waste gas pipeline is sequentially provided with a bidirectional passive explosion-proof valve and an induced draft fan; a pressure difference transmitter is arranged between the air inlet and the air outlet of the bag type dust collector;
the middle part of the bag type dust collector is communicated with a back-blowing gas pipeline provided with a second pressure transmitter, the middle part of the bag type dust collector is also provided with an explosion venting device, a fourth temperature transmitter is arranged at the position of a hopper below the bag type dust collector, and a third rotary valve is arranged at the bottom of the bag type dust collector.
Further, the baghouse is disposed in an outdoor area.
Furthermore, a pipeline type magnetic filter is arranged between the blower and the one-way passive explosion-proof valve on the air pipeline.
Further, a first cleaning gas pipeline is further arranged at the hopper below the storage bin.
Furthermore, a second cleaning gas pipeline is arranged at the hopper below the bag type dust collector.
Furthermore, the chemical explosion-proof device comprises a spark detector, a pressure transmitter and a chemical explosion-proof bottle.
By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:
according to the method for pneumatic starch conveying and dust removal and the dust explosion-proof system, provided by the invention, automatic detection of pressure, temperature and spark can be realized, and equipment failure and dust combustion and explosion risks can be found in time; automatic waterfall discharge and explosion suppression are realized, a series of safety interlocking and shutdown are performed, the influence range of dust combustion and explosion danger is reduced, and the safety production reliability is ensured; the feeding and discharging are automatic, so that the operation continuity of a process system is ensured; the operation safety and the operation continuity of the starch pneumatic conveying device and the dedusting equipment thereof are improved.
Drawings
FIG. 1 is a schematic view of a dust explosion-proof system for pneumatic starch conveying and dust removal according to the present invention;
wherein the reference numerals are:
1-blower, 2-feeding station, 3-stock bin, 4-bag type dust collector, 5-induced draft fan, 6-pipeline type magnetic filter, 7-one-way passive explosion-proof valve, 8-first rotary valve, 9-flameless explosion-proof device, 10-filter device, 11-second rotary valve, 12-third rotary valve, 13-two-way passive explosion-proof valve, 14-first pressure transmitter, 15-first temperature transmitter, 16-second temperature transmitter, 17-chemical explosion-proof device, 18-third temperature transmitter, 19-differential pressure transmitter, 20-explosion-proof device, 21-fourth temperature transmitter, 22-second pressure transmitter, 23-air pipeline, 24-material pipeline, 25-first cleaning gas pipeline, 26-a bin waste gas pipeline, 27-a bag type dust collector waste gas pipeline, 28 as a back-blowing gas pipeline and 29 as a second cleaning gas pipeline.
Detailed Description
The present invention will be described in detail and specifically with reference to the following examples to facilitate better understanding of the present invention, but the following examples do not limit the scope of the present invention.
Example 1
The embodiment provides a method for pneumatic conveying and dust removal of starch, as shown in fig. 1, comprising the following steps:
s1, start-up step: air enters the system from a material pipeline 24 through an air blower 1 and a pipeline type magnetic filter 6, and waste gas after passing through a bag type dust collector 4 enters a subsequent induced draft fan 5 through a bag type dust collector waste gas pipeline 27;
s2, working procedure: unpacking the materials, putting the unpacked materials into a feeding station 2 with a micro-negative pressure environment, enabling the unpacked materials to enter a conveying system through a first rotary valve 8, recovering most of the materials to a storage bin 3 for storage under the action of a filtering device 10, enabling the materials to enter a subsequent process through a second rotary valve 11, and enabling a small part of starch to leave the filtering device 10 along with waste gas to enter a subsequent dedusting process;
s3, a dust removal process: in the step S2, the waste gas leaving the filtering device 10 enters the bag type dust collector 4 through the bin waste gas pipeline 26 for dust removal, the ash obtained by dust removal is collected through the third rotary valve 12, and meanwhile, the waste gas after dust removal enters the subsequent induced draft fan 5 through the bag type dust collector waste gas pipeline 27 and is safely discharged;
wherein, the waterfall measure is:
the storage bin 3 is provided with a flameless waterfall discharging device 9 for discharging dust explosion in the storage bin 3;
the bag-type dust collector 4 is provided with an explosion venting device 20 for the explosion venting of dust of the bag-type dust collector 4;
the flameless waterfall discharging device 9 and the explosion discharging device 20 are provided with state signals, and when the flameless waterfall discharging device and the explosion discharging device act, the chemical explosion-proof device 17 is started, and the whole conveying and dust removing system is safely interlocked and stopped;
wherein, the flame proof measure does:
the air pipeline 23 is provided with a one-way passive explosion-proof valve 7 for transmitting dust explosion in the storage bin 3 to an air source;
the bin waste gas pipeline 26 is provided with a chemical explosion-proof device 17 for preventing the dust explosion in the bin 3 from spreading to the bag type dust collector 4 and preventing the dust explosion in the bag type dust collector 4 from spreading to the bin 3;
the bag type dust collector waste gas pipeline 27 is provided with a bidirectional passive explosion-proof valve 13 for isolating dust explosion between a dust collection system and a subsequent induced draft fan;
when the chemical explosion-proof device 17 acts, the whole conveying and dust removing system is safely interlocked and stopped;
the one-way passive explosion-proof valve 7 and the two-way passive explosion-proof valve 13 are provided with state signals, and the whole conveying and dust removing system is safely interlocked and stopped when the two-way passive explosion-proof valve acts.
In the above process flow of the present invention, the following self-control measures are adopted:
a first pressure transmitter 14 and/or a first temperature transmitter 15 are/is arranged above the stock bin 3, and if the temperature and/or the pressure exceed a preset range, the chemical explosion-proof device 17 is closed;
a second temperature transmitter 16 is arranged at the hopper below the stock bin 3, and if the temperature on the hopper exceeds a preset range, an alarm is given, explosion suppression measures are started in a linkage mode, and the machine is stopped;
the third temperature transmitter 18 is arranged on the bin waste gas pipeline 26, and when the temperature exceeds a set value, the chemical explosion-proof device 17 is closed;
a pressure difference transmitter 19 is arranged between the air inlet and the air outlet of the bag-type dust collector 4, when the pressure change of the inlet and the outlet of the bag-type dust collector 4 is greater than an allowable value 1, an audible and visual alarm signal is sent out, and when the pressure change is greater than an allowable value 2, the whole conveying system and the dust collection system are safely interlocked and shut down;
a fourth temperature transmitter 21 is arranged at the hopper below the bag type dust collector 4, and if the temperature on the hopper exceeds a preset range, the fourth temperature transmitter gives an alarm, starts the explosion-proof measures in a linkage manner and stops the operation;
the bag type dust collector 4 is provided with a second pressure transmitter 22 on a back-blowing gas pipeline 28, and an alarm is given if the pressure is lower than a preset range;
throw 2 bottoms in material station and be equipped with first rotary valve 8, 3 bottoms in feed bin and be equipped with second rotary valve 11, bag collector 4 is equipped with third rotary valve 12 for automatic discharge when unloading the rotary valve trouble, carries out safety interlock and shut down to whole transport and dust pelletizing system.
In the above process flow of the present invention, each operation before operation is preset in the control system, and the whole operation process is manually started.
Example 2
Referring to fig. 1, the present embodiment provides a dust explosion-proof system for pneumatic starch conveying and dust removing based on the method of embodiment 1, including:
the starch pneumatic conveying system comprises an air pipeline 23, a feeding station 2, a material pipeline 24, a storage bin 3 and a storage bin waste gas pipeline 26, wherein the air pipeline 23 is sequentially provided with an air blower 1 and a one-way passive explosion-proof valve 7, and is finally communicated with a discharge port at the bottom of the feeding station 2 and led out of the material pipeline 24; the material pipeline 24 is communicated with the stock bin 3; the top of the storage bin 3 is provided with a filtering device 10, and one end of the filtering device 10 is communicated with a storage bin waste gas pipeline 26;
the top of the storage bin 3 is also provided with a flameless waterfall leakage device 9, a first pressure transmitter 14 and/or a first temperature transmitter 15 are/is arranged above the storage bin, a second temperature transmitter 16 is arranged at a hopper below the storage bin, and a second rotary valve is arranged at the bottom of the storage bin;
the dust removal system comprises a bag type dust remover 4, wherein the air inlet end of the bag type dust remover 4 is communicated with a starch pneumatic conveying system through a bin waste gas pipeline 26, and the air outlet end of the bag type dust remover 4 is connected with a bag type dust remover waste gas pipeline 27; a chemical explosion-proof device 17 and a third temperature transmitter 18 are sequentially arranged on one side of the dust removal system on the bin waste gas pipeline 26; the bag type dust collector waste gas pipeline 27 is sequentially provided with a bidirectional passive explosion-proof valve 3 and an induced draft fan 5; a differential pressure transmitter 19 is arranged between the air inlet and the air outlet of the bag-type dust collector 4;
the middle part of the bag type dust collector 4 is communicated with a back-blowing gas pipeline 28 provided with a second pressure transmitter 22, the middle part is also provided with an explosion venting device 20, a fourth temperature transmitter 21 is arranged at the lower hopper, and the bottom part is provided with a third rotary valve 12.
In the present invention, the bag house 4 is disposed in an outdoor area.
In the invention, a pipeline type magnetic filter 6 is arranged between the blower 1 and the one-way passive explosion-proof valve 7 on the air pipeline 23 to remove possible metal impurities in the air pipeline 23.
In the invention, a first cleaning gas pipeline 25 is also arranged at the hopper below the stock bin 3; a second cleaning gas pipeline 29 is arranged at the hopper below the bag-type dust collector 4 and used for cleaning powder deposited on the wall surface of the hopper bin.
In the invention, the chemical explosion-proof device 17 comprises a spark detector, a pressure transmitter and a chemical explosion suppression bottle, because the material in the bin waste gas pipeline 26 has certain dust content, if a mechanical explosion-proof device is adopted, the dust is easy to cause the mechanical explosion-proof device not to work normally.
The system can realize automatic detection of pressure, temperature and spark, and timely discover equipment failure and dust combustion and explosion risks; automatic waterfall discharge and explosion suppression are realized, a series of safety interlocking and shutdown are performed, the influence range of dust combustion and explosion danger is reduced, and the safety production reliability is ensured; the feeding and discharging are automatic, so that the operation continuity of a process system is ensured; the operation safety and the operation continuity of the starch pneumatic conveying device and the dedusting equipment thereof are improved.
Application example 1
By using the system and method of example 1-2, a pharmaceutical factory mainly produces drugs with a throughput of 400kg/h in a batch production, air is used to transport starch to a silo, and waste gas is discharged to the atmosphere after being dedusted by a bag deduster. By adopting the explosion-proof system, the following data are obtained:
the operation time is as follows: continuous
Setting personnel at a workshop section: the number of operators was 1.
In the operation process, the material is automatically fed and discharged, when the temperature of the inner wall of the hopper of the bag type dust collector exceeds a set value, the machine can be stopped in time, the gas is adopted to sweep the dust accumulated on the hopper, the bag type dust collector is isolated from other systems in time, and the expansion of danger is avoided.
Comparative example 1
A certain pharmaceutical factory mainly produces medicines, the treatment capacity in a batch of production is 400kg/h, air is adopted to convey starch to a storage bin, and waste gas is discharged to the atmosphere after being dedusted by a bag type deduster. If no security measures are taken, the following data are obtained:
the operation time is as follows: continuous
In the operation process, the material is automatically fed and discharged, but when the pressure in the storage bin is abnormal, the pressure is not timely discharged due to the fact that the waterfall discharging device and the explosion-proof device are not installed, the pressure is transmitted to the bag type dust collector, finally, the waterfall is discharged through the explosion-proof device on the bag type dust collector, and the whole system is placed in a dangerous state.
Comparative example 2
A certain pharmaceutical factory mainly produces medicines, the treatment capacity in a batch of production is 400kg/h, air is adopted to convey starch to a storage bin, and waste gas is discharged to the atmosphere after being dedusted by a bag type deduster. If no security measures are taken, the following data are obtained:
the operation time is as follows: continuous
In the operation process, the material is automatically fed and discharged, when a temperature transmitter is not arranged on the inner wall of the hopper of the bag-type dust collector, dust is continuously accumulated in the hopper, self-heating occurs, the dust is not found in time, the ignition temperature of a dust layer is reached, smoldering occurs, and once dust cloud is formed in the bag-type dust collector, dust explosion is caused.
The embodiments of the present invention have been described in detail, but the embodiments are merely examples, and the present invention is not limited to the embodiments described above. It will be appreciated by those skilled in the art that any equivalent modifications and substitutions are within the scope of the present invention. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered by the present invention.
Claims (9)
1. A method for pneumatic conveying and dust removal of starch adopts a dust explosion-proof system for pneumatic conveying and dust removal of starch, and is characterized by comprising the following steps:
s1, start-up step: air enters the system from a material pipeline (24) through an air blower (1) and a pipeline type magnetic filter (6), and waste gas passing through a bag type dust collector (4) enters a subsequent induced draft fan (5) through a bag type dust collector waste gas pipeline (27);
s2, working procedure: the method comprises the following steps that materials are unpacked and then put into a feeding station (2) with a micro-negative pressure environment, the materials enter a conveying system through a first rotary valve (8), most of the materials are recovered to a storage bin (3) to be stored under the action of a filtering device (10), the materials enter a subsequent process through a second rotary valve (11), and meanwhile, a small part of starch leaves the filtering device (10) along with waste gas to enter a subsequent dust removal process;
s3, a dust removal process: in the S2, the waste gas leaving the filtering device (10) enters a bag type dust collector (4) through a bin waste gas pipeline (26) for dust removal, the ash obtained by dust removal is collected through a third rotary valve (12), and meanwhile, the waste gas after dust removal enters a subsequent induced draft fan (5) through a bag type dust collector waste gas pipeline (27) and is safely discharged;
wherein, the waterfall measure is:
a flameless waterfall discharge device (9) is arranged on the storage bin (3) and is used for discharging the dust explosion of the storage bin (3);
the bag type dust collector (4) is provided with an explosion venting device (20) for venting dust explosion of the bag type dust collector (4);
the flameless waterfall discharging device (9) and the explosion discharging device (20) are provided with state signals, and when the flameless waterfall discharging device and the explosion discharging device act, the chemical explosion-proof device (17) is started, and the whole conveying and dust removing system is safely interlocked and stopped;
wherein, the flame proof measure does:
the air pipeline (23) is provided with a one-way passive explosion-proof valve (7) for transmitting dust explosion in the storage bin (3) to an air source;
a chemical explosion-proof device (17) is arranged on the bin waste gas pipeline (26) and is used for preventing dust explosion in the bin (3) from spreading to the bag type dust collector (4) and preventing dust explosion in the bag type dust collector (4) from spreading to the bin (3);
a bidirectional passive explosion-proof valve (13) is arranged on a waste gas pipeline (27) of the bag type dust collector and is used for isolating dust explosion between a dust collection system and a subsequent induced draft fan;
when the chemical explosion-proof device (17) acts, the whole conveying and dust removing system is safely interlocked and stopped;
the one-way passive explosion-proof valve (7) and the two-way passive explosion-proof valve (13) are provided with state signals, and the whole conveying and dust removing system is safely interlocked and stopped when the two-way passive explosion-proof valve acts.
2. The method for pneumatic conveying and dedusting of starch according to claim 1, wherein the self-control measures of the method comprise:
a first pressure transmitter (14) and/or a first temperature transmitter (15) are/is arranged above the stock bin (3), and if the temperature and/or the pressure exceed a preset range, the chemical explosion-proof device (17) is closed;
a second temperature transmitter (16) is arranged at the hopper below the stock bin (3), and if the temperature on the hopper exceeds a preset range, the second temperature transmitter gives an alarm, starts the explosion-proof measures in a linkage manner and stops the operation;
a third temperature transmitter (18) is arranged on the bin waste gas pipeline (26), and when the temperature exceeds a set value, the chemical explosion-proof device (17) is closed;
a pressure difference transmitter (19) is arranged between the air inlet and the air outlet of the bag type dust collector (4), when the pressure change of the inlet and the outlet of the bag type dust collector (4) is greater than an allowable value 1, an audible and visual alarm signal is sent out, and when the pressure change is greater than an allowable value 2, the whole conveying system and the dust collection system are safely interlocked and shut down;
a fourth temperature transmitter (21) is arranged at the hopper below the bag type dust collector (4), and if the temperature on the hopper exceeds a preset range, the fourth temperature transmitter gives an alarm, starts explosion-proof measures in a linkage mode and stops;
a second pressure transmitter (22) is arranged on a back-blowing gas pipeline (28) of the bag type dust collector (4), and an alarm is given if the pressure is lower than a preset range;
throw material station (2) bottom and be equipped with first rotary valve (8), feed bin (3) bottom is equipped with second rotary valve (11), bag collector (4) are equipped with third rotary valve (12) for automatic discharge when unloading the rotary valve trouble, carries out safety interlock and shut down to whole transport and dust pelletizing system.
3. The method for pneumatic conveying and dedusting of starch according to claim 1, wherein each operation is preset in a control system before the method is operated, and the whole operation process is manually started.
4. A dust explosion-proof system for pneumatic starch conveying and dust removal is applied to the method for pneumatic starch conveying and dust removal according to any one of claims 1 to 3, and is characterized by comprising the following steps:
the starch pneumatic conveying system comprises an air pipeline (23), a feeding station (2), a material pipeline (24), a storage bin (3) and a storage bin waste gas pipeline (26), wherein an air blower (1) and a one-way passive explosion-proof valve (7) are sequentially arranged on the air pipeline (23), and finally the air pipeline is communicated with a discharge hole at the bottom of the feeding station (2) and led out of the material pipeline (24); the material pipeline (24) is communicated with the storage bin (3); the top of the storage bin (3) is provided with a filtering device (10), and one end of the filtering device (10) is communicated with the storage bin waste gas pipeline (26);
the top of the storage bin (3) is also provided with a flameless waterfall leakage device (9), a first pressure transmitter (14) and/or a first temperature transmitter (15) are/is arranged above the storage bin, a second temperature transmitter (16) is arranged at a hopper below the storage bin, and a second rotary valve is arranged at the bottom of the storage bin;
the dust removal system comprises a bag type dust remover (4), wherein the air inlet end of the bag type dust remover (4) is communicated with the starch pneumatic conveying system through a bin waste gas pipeline (26), and the air outlet end of the bag type dust remover is connected with a bag type dust remover waste gas pipeline (27); a chemical explosion-proof device (17) and a third temperature transmitter (18) are sequentially arranged on one side of the dust removal system on the bin waste gas pipeline (26); the bag type dust collector waste gas pipeline (27) is sequentially provided with a bidirectional passive explosion-proof valve (3) and an induced draft fan (5); a pressure difference transmitter (19) is arranged between the air inlet and the air outlet of the bag type dust collector (4);
the middle part of the bag type dust collector (4) is communicated with a back-blowing gas pipeline (28) provided with a second pressure transmitter (22), the middle part is also provided with an explosion venting device (20), a fourth temperature transmitter (21) is arranged at the hopper below, and the bottom is provided with a third rotary valve (12).
5. Dust explosion protection system for pneumatic conveying and dust removal of starch according to claim 4, wherein the bag house (4) is arranged in an outdoor area.
6. The dust explosion-proof system for starch pneumatic transmission and dust removal according to claim 4, wherein a pipeline type magnetic filter (6) is arranged on the air pipeline (23) between the blower (1) and the one-way passive explosion-proof valve (7).
7. The pneumatic starch conveying and dedusting dust explosion prevention system as claimed in claim 4, wherein a first cleaning gas pipeline (25) is further arranged at the hopper below the storage bin (3).
8. The pneumatic starch conveying and dedusting dust explosion prevention system as claimed in claim 4, wherein a second cleaning gas pipeline (29) is further arranged at a hopper below the bag-type dust collector (4).
9. The pneumatic starch conveying and dedusting dust explosion-proof system according to claim 4, wherein the chemical explosion-proof device (17) comprises a spark detector, a pressure transmitter and a chemical explosion-proof bottle.
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| CN113247629A (en) * | 2021-04-27 | 2021-08-13 | 金华市农业科学研究院(浙江省农业机械研究院) | Tea seed oil device that extracts oil |
| CN114014019A (en) * | 2021-11-15 | 2022-02-08 | 聊城市鲁西化工工程设计有限责任公司 | Negative-pressure automatic continuous conveying system and method for powdery or granular materials |
| CN114950034A (en) * | 2022-05-31 | 2022-08-30 | 中国安全生产科学研究院 | Dust remover explosion-proof system and method, dust removal system, electronic equipment and storage medium |
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Application publication date: 20200828 |