CN111569754A - Combustible powder feeding and mixing method and dust explosion-proof system - Google Patents
Combustible powder feeding and mixing method and dust explosion-proof system Download PDFInfo
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- CN111569754A CN111569754A CN202010444166.8A CN202010444166A CN111569754A CN 111569754 A CN111569754 A CN 111569754A CN 202010444166 A CN202010444166 A CN 202010444166A CN 111569754 A CN111569754 A CN 111569754A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/60—Safety arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/21—Measuring
- B01F35/211—Measuring of the operational parameters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/60—Safety arrangements
- B01F35/605—Safety devices concerning the operation of the mixer
- B01F35/6052—Safety devices concerning the operation of the mixer with locking, blocking or interlocking mechanisms for preventing operation of the actuation mechanism of the mixing device
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Abstract
The invention relates to a method for feeding and mixing combustible powder and a dust explosion-proof system, wherein the system and the method can realize online monitoring of dust concentration in an environment and oxygen content in equipment, timely discovery of equipment faults and prevention of material blockage; realizing automatic waterfall; a series of safety interlocking and shutdown are carried out, the influence range of dust combustion and explosion danger is reduced, and the operation safety in the processes of feeding and mixing combustible powder in the pharmaceutical chemical industry is improved.
Description
Technical Field
The invention relates to the field of pharmaceutical chemical production, in particular to a method for feeding and mixing combustible powder and a dust explosion-proof system.
Background
In the field of pharmaceutical and chemical production, processes of feeding and mixing combustible powder materials are often involved, such as feeding and storing starch into a storage bin, feeding of soybean meal and maltodextrin in a fermentation process, mixing of active pharmaceutical ingredients and additives, mixing and packaging of different nutrients, and the like. In these production processes, an explosive dust environment is inevitably formed, which not only seriously affects the occupational health and safety of workers, but also may cause dust explosion once exposed to open fire or high temperature, causing huge economic loss. Compared with gas explosion, the dust explosion has smaller intensity, but generates larger energy, causes higher damage degree and has higher possibility of secondary explosiveness. The design of dust explosion protection and control measures is therefore a crucial task.
At present, during the combustible dust feeding process, most of the design of dust explosion-proof facilities is concerned in a dust removal system, and the monitoring of dust concentration in the environment is less. For example, patent 201721365741.5 discloses a dust removing device for collection, recovery, explosion suppression and explosion release of starch feeding dust, which only considers the design of dust explosion prevention measures in a dust removing system, and does not provide a solution for the raise dust possibly generated in the surrounding environment of a feeding port; patent 201520658282.4 discloses an explosion-proof wet dust collector for Al-Mg dust, which does not consider the on-line monitoring of dust concentration in the environment for Al-Mg dust with higher explosion risk; for the mixing process of combustible powder, dust explosion prevention measures are rarely adopted in the equipment, for example, patent 201610867892.4 discloses a modified starch product mixing and stirring system, which only focuses on the uniformity and stability of the mixed product, but does not describe the risk of dust explosion in the mixing process.
Disclosure of Invention
The invention aims to solve the problems of insufficient and incomplete explosion-proof facilities in the feeding and mixing processes of combustible powder in the prior art, and provides a method for feeding and mixing combustible powder and a dust explosion-proof system.
In order to achieve the purpose, the invention adopts the following technical scheme:
the first aspect of the invention provides a combustible powder feeding and mixing method, which is applied to a combustible powder feeding and mixed dust explosion-proof system and comprises the following steps:
s1, start-up step: starting a feeding station and keeping the interior of the feeding station in a negative pressure state; meanwhile, nitrogen enters the system from a third nitrogen pipeline, the displaced air is discharged to the outside through a second exhaust pipeline, and when the oxygen concentration detection instrument displays that the oxygen content is lower than a set value, the process is finished;
s2, feeding: feeding a plurality of materials into the feeding station from a feeding port, intercepting flying dust generated in the feeding process in a first filter, and safely discharging filtered gas to the outside;
s3, mixing step: after S2, the material in the feeding station enters the mixing bin through the rotary valve, and the raised dust-containing gas is safely discharged to the outside under the action of the second self-operated regulating valve after the dust is intercepted by the second filter; the materials are fully mixed under the rotation and revolution motion of the stirrer;
s4, unloading: the material mixed by the S3 enters the subsequent process flow from the outlet of the mixing bin; meanwhile, vacuum is generated due to discharging, and nitrogen is supplemented into the mixing bin through a first self-operated regulating valve; and nitrogen is introduced into the third nitrogen pipeline below the mixing bin to prevent materials from accumulating on the wall surface near the discharge port.
Further, the first filter and the second filter in steps S2 and S3 both have a pressure difference online monitoring function, and when the pressure difference is greater than a set value, the first switch valve and the third switch valve are respectively controlled to perform blowback ash removal on the filters.
Further, the automatic control measures of the method comprise the following steps:
a dust concentration probe and an air suction cover are arranged near a feeding port of the feeding station, when the monitored dust concentration exceeds a set value, an audible and visual alarm signal is sent out, and a dust removal system is unlocked in a locked mode, so that the dust concentration in the indoor environment is ensured to be within a safe range;
an oxygen concentration detection instrument is arranged on a second exhaust pipeline of the mixing bin, and when the oxygen concentration exceeds a set value, an audible and visual alarm signal is sent out and the feeding and the stirring are stopped in a locked mode;
a first material level meter and a second material level meter are respectively arranged at the upper part and the lower part of the mixing bin, when the first material level meter monitors that the material level reaches an upper limit value, the feeding of the materials into the mixing bin is stopped in a linkage manner, and when the second material level meter monitors that the material level reaches a lower limit value, the discharging is stopped in a linkage manner;
the rotary valve is arranged at the bottom of the feeding station and used for automatically discharging materials, when the discharging rotary valve fails, the sound-light alarm is generated, and the dust removal system is unlocked in a parallel locking manner.
Further preferably, the dust removal system adopts one or more of explosion suppression, explosion venting, explosion suppression and explosion-proof prevention and control measures, but the explosion suppression prevention and control measures cannot be independently adopted.
Further, the waterfall measures of the method are as follows: and the mixing bin is provided with a waterfall device for the waterfall of dust explosion of the mixing bin.
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 present invention provides a combustible powder feeding and mixed dust explosion-proof system, which is applied to the combustible powder feeding and mixing method, and comprises:
a feeding station, which comprises a first filter positioned at the top of the feeding station, a feeding port at the upper part of the feeding station and an internal rotary valve; the first filter is communicated with a first compressed air pipeline and a first exhaust pipeline;
the mixing bin comprises a second filter and a waterfall discharging device which are positioned at the top of the mixing bin, an internal stirrer, a first level gauge at the upper part, a second level gauge at the lower part and a mixing bin outlet at the bottom; the top of the mixing bin is communicated with a first nitrogen pipeline and a second compressed air pipeline, and the bottom of the mixing bin is communicated with a third nitrogen pipeline; the bottom of the feeding station is communicated with the top of the mixing bin through a feeding pipeline;
and the front end of the dust removal system is connected with an air suction cover, and the air suction cover is positioned near the dust concentration probe near the feed port.
Further, the second filter is communicated with a second exhaust pipeline and a second nitrogen pipeline; and an oxygen concentration detection instrument is arranged on the second exhaust pipeline.
Furthermore, the rotary valve is a rotary valve with an explosion-proof function; and a magnetic separation device is also arranged in the feeding station.
Furthermore, the waterfall discharging device adopts a mode of arranging a discharging conduit or adopts a flameless discharging device; the bleed conduit directs the explosion out of the chamber.
By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:
the invention provides a method for feeding and mixing combustible powder and a dust explosion-proof system, which can realize online monitoring of dust concentration in an environment and oxygen content in equipment, timely discovery of equipment faults and prevention of material blockage; realizing automatic waterfall; a series of safety interlocking and shutdown are carried out, the influence range of dust combustion and explosion danger is reduced, and the operation safety in the processes of feeding and mixing combustible powder in the pharmaceutical chemical industry is improved.
Drawings
FIG. 1 is a schematic view of an explosion-proof system for combustible powder feeding and mixed dust of the present invention;
wherein the reference numerals are:
1-feeding station, 2-mixing bin, 3-first filter, 4-dust concentration probe, 5-rotary valve, 6-waterfall discharging device, 7-second filter, 8-first switch valve, 9-first check valve, 10-feeding port, 11-first self-operated regulating valve, 12-second switch valve, 13-oxygen concentration detecting instrument, 14-second self-operated regulating valve, 15-second check valve, 16-third switch valve, 17-fourth switch valve, 18-stirrer, 19-first level meter, 20-second level meter, 21-mixing bin outlet, 22-first compressed air pipeline, 23-first exhaust pipeline, 24-feeding pipeline, 25-first nitrogen pipeline, 26-second compressed air pipeline, 27-a second exhaust pipeline, 28-a second nitrogen pipeline, 29-a third nitrogen pipeline, 30-an air suction hood, 31-a dust removal system and 32-a fifth switch valve.
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 combustible powder feeding and mixing method, which is applied to a combustible powder feeding and mixed dust explosion-proof system, as shown in fig. 1, and comprises the following process flows:
s1, start-up step: starting the feeding station 1 and keeping the interior of the feeding station in a negative pressure state; meanwhile, nitrogen enters the system from a third nitrogen pipeline 29, the displaced air is discharged to the outside through a second exhaust pipeline 27, and when the oxygen concentration detection instrument 13 displays that the oxygen content is lower than a set value, the process is finished;
s2, feeding: a plurality of materials are fed into the feeding station 1 from a feeding port 10, dust generated in the feeding process is intercepted in a first filter 3, and filtered gas is safely discharged to the outside;
s3, mixing step: after S2, the material in the feeding station 1 enters the mixing bin 2 through the rotary valve 5, and the raised dust-containing gas is safely discharged to the outside under the action of the second self-operated regulating valve 14 after the dust is intercepted by the second filter 7; the materials are fully mixed under the rotation and revolution motion of the stirrer 18;
s4, unloading: the material mixed by the S3 enters the subsequent process flow from the outlet 21 of the mixing bin; meanwhile, vacuum is generated due to discharging, and nitrogen is supplemented into the mixing bin 2 through the first self-operated regulating valve 11; and, the third nitrogen pipeline 29 below the mixing bin 2 is filled with nitrogen to prevent materials from accumulating on the wall surface near the discharge port.
In the above process flow of the present invention, the first filter 3 and the second filter 7 in steps S2 and S3 both have a pressure difference online monitoring function, and when the pressure difference is greater than a set value, the first switch valve 8 and the third switch valve 16 are respectively controlled to perform blowback ash removal on the filters.
In the above process flow of the present invention, the following self-control measures are adopted:
a dust concentration probe 4 and an air suction cover 30 are arranged near a feeding port 10 of the feeding station 1, when the monitored dust concentration exceeds a set value, an audible and visual alarm signal is sent out, and a dust removal system 31 is locked and started to ensure that the dust concentration in the indoor environment is within a safe range;
an oxygen concentration detection instrument 13 is arranged on a second exhaust pipeline 27 of the mixing bin 2, and when the oxygen concentration exceeds a set value, an audible and visual alarm signal is sent out and the feeding and the stirring are stopped in a locked mode;
a first material level meter 19 and a second material level meter 20 are respectively arranged at the upper part and the lower part of the mixing bin 2, when the first material level meter 19 monitors that the material level reaches an upper limit value, the feeding into the mixing bin 2 is stopped in a chain manner, and when the second material level meter 20 monitors that the material level reaches a lower limit value, the discharging is stopped in a chain manner;
the automatic material feeding system is characterized in that a rotary valve 5 is arranged at the bottom of the material feeding station 1 and used for automatically discharging materials, when the rotary valve for discharging materials fails, sound and light alarm is carried out, and a dust removal system 31 is locked and opened, wherein the dust removal system 31 adopts one or more of explosion-proof, explosion-venting, explosion suppression and explosion-proof prevention and control measures, but the explosion-proof prevention and control measures cannot be independently adopted.
In the above process flow of the present invention, the following waterfall measures are adopted: and the mixing bin 2 is provided with a waterfall device 6 for the waterfall of the dust explosion of the mixing bin 2.
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 an explosion-proof system for combustible powder feeding and mixed dust based on the method of embodiment 1, including:
a feeding station 1, wherein the feeding station 1 comprises a first filter 3 positioned at the top of the feeding station, an upper feeding port 10 and an internal rotary valve 5; the first filter 3 is communicated with a first compressed air pipeline 22 and a first exhaust pipeline 23;
a mixing silo 2, wherein the mixing silo 2 comprises a second filter 7 and a waterfall device 6 at the top part thereof, an internal stirrer 18, a first level gauge 19 at the upper part, a second level gauge 20 at the lower part and a mixing silo outlet 21 at the bottom part; the second filter 7 is communicated with a second exhaust pipeline 27 and a second nitrogen pipeline 28; an oxygen concentration detection instrument 13 is arranged on the second exhaust pipeline 27; the top of the mixing bin 2 is communicated with a first nitrogen pipeline 25 and a second compressed air pipeline 26, and the bottom of the mixing bin is communicated with a third nitrogen pipeline 29; the bottom of the feeding station 1 is communicated with the top of the mixing bin 2 through a feeding pipeline 24;
and the front end of the dust removal system 31 is connected with an air suction hood 30, and the air suction hood 30 is positioned near the dust concentration probe 4 near the feeding port 10.
Preferably, the rotary valve 5 is a rotary valve with an explosion-proof function.
Preferably, a magnetic separation device is further arranged in the feeding station 1.
Preferably, the waterfall discharging device 6 adopts a mode of arranging a discharging conduit or adopts a flameless discharging device; the bleed conduit directs the explosion out of the chamber.
The system can realize online monitoring of dust concentration in the environment and oxygen content in the equipment, timely discovery of equipment faults and prevention of material blockage; realizing automatic waterfall; a series of safety interlocking and shutdown are carried out, the influence range of dust combustion and explosion danger is reduced, and the operation safety in the process of feeding and mixing combustible powder in the pharmaceutical chemical industry is improved
Application example 1
A certain pharmaceutical factory mainly mixes corn starch and silicon dioxide, the treatment capacity in a batch of production is 200kg/h, and a feeding station is adopted for feeding and a vertical double-cone helical ribbon mixer is adopted for mixing. The following data were obtained using the explosion-proof system and method of examples 1-2:
the operation time is as follows: 1h
Setting personnel at a workshop section: the number of operators was 1.
In the operation process, the dust concentration in the feeding environment is always in a safe range, and the dust can not be ignited when sparks appear in the chamber, so that the possibility of dust explosion is avoided.
Application example 2
A certain pharmaceutical factory mainly mixes corn starch and silicon dioxide, the treatment capacity in a batch production is 400kg/h, and a feeding station is adopted for feeding and a vertical double-cone helical ribbon mixer is adopted for mixing. The following data were obtained using the explosion-proof system and method of examples 1-2:
the operation time is as follows: 2h
Setting personnel at a workshop section: the number of operators was 1.
In the operation process, the concentration of nitrogen in the mixer is always maintained in a safe range, and when the powder generates electrostatic sparks in the stirring and flowing processes, the powder cloud cannot be ignited, so that the possibility of explosion is avoided.
Comparative example 1
A certain pharmaceutical factory mainly mixes corn starch and silicon dioxide, the treatment capacity in a batch of production is 200kg/h, and a feeding station is adopted for feeding and a vertical double-cone helical ribbon mixer is adopted for mixing. With traditional security measures, the following data are obtained:
the operation time is as follows: 1h
In the operation process, throw the material station and break down, can't guarantee to throw the state of material station internal negative pressure, throw the raise dust that the material produced and spread to indoor environment, place operating personnel in the hazardous environment of dust cloud.
Comparative example 2
A certain pharmaceutical factory mainly mixes corn starch and silicon dioxide, the treatment capacity in a batch production is 400kg/h, and a feeding station is adopted for feeding and a vertical double-cone helical ribbon mixer is adopted for mixing. With traditional security measures, the following data are obtained:
the operation time is as follows: 2h
In the operation process, under the action of stirring in the mixer, a starch-air dust explosive environment always exists, and when the energy of electrostatic sparks generated in the stirring and flowing process of the powder is enough to ignite dust clouds, explosion can occur.
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 (10)
1. A combustible powder feeding and mixing method is applied to a combustible powder feeding and mixed dust explosion-proof system and is characterized by comprising the following steps:
s1, start-up step: starting the feeding station (1) and keeping the interior of the feeding station in a negative pressure state; meanwhile, nitrogen enters the system from a third nitrogen pipeline (29), the replaced air is exhausted to the outside through a second exhaust pipeline (27), and when the oxygen concentration detection instrument (13) displays that the oxygen content is lower than a set value, the process is finished;
s2, feeding: a plurality of materials are fed into the feeding station (1) from a feeding port (10), raised dust generated in the feeding process is intercepted in a first filter (3), and filtered gas is safely discharged to the outside;
s3, mixing step: after S2, the material in the feeding station (1) enters the mixing bin (2) through the rotary valve (5), and the raised dust-containing gas is safely discharged to the outside under the action of the second self-operated regulating valve (14) after the dust is intercepted by the second filter (7); the materials are fully mixed under the rotation and revolution motion of the stirrer (18);
s4, unloading: the material mixed by the S3 enters the subsequent process flow from the outlet (21) of the mixing bin; meanwhile, vacuum is generated due to discharging, and nitrogen is supplemented into the mixing bin (2) through a first self-operated regulating valve (11); and the third nitrogen pipeline (29) arranged below the mixing bin (2) is filled with nitrogen to prevent materials from accumulating on the wall surface near the discharge port.
2. The combustible powder feeding and mixing method according to claim 1, wherein the first filter (3) and the second filter (7) in steps S2 and S3 have a function of monitoring pressure difference on line, and when the pressure difference is larger than a set value, the first switch valve (8) and the third switch valve (16) are respectively controlled to perform back-blowing ash removal on the filters.
3. The process for the charging and mixing of combustible powders according to claim 1, characterized in that the self-control measures of the process comprise:
a dust concentration probe (4) and an air suction cover (30) are arranged near a feeding port (10) of the feeding station (1), when the monitored dust concentration exceeds a set value, an audible and visual alarm signal is sent out, and a dust removal system (31) is locked and started to ensure that the dust concentration in the indoor environment is within a safe range;
an oxygen concentration detection instrument (13) is arranged on a second exhaust pipeline (27) of the mixing bin (2), and when the oxygen concentration exceeds a set value, an audible and visual alarm signal is sent out and the feeding and stirring are stopped in a locked manner;
a first material level meter (19) and a second material level meter (20) are respectively arranged at the upper part and the lower part of the mixing bin (2), when the first material level meter (19) monitors that the material level reaches an upper limit value, the feeding into the mixing bin (2) is stopped in a linkage manner, and when the second material level meter (20) monitors that the material level reaches a lower limit value, the discharging is stopped in a linkage manner;
throw material station (1) bottom and be equipped with rotary valve (5) for automatic discharge, when the rotary valve trouble of unloading, take place audible and visual alarm, and the dust pelletizing system (31) is opened in the parallel lock.
4. The combustible powder feeding and mixing method according to claim 3, wherein the dust removal system (31) adopts one or more of explosion-proof, explosion-venting, explosion suppression and explosion-proof prevention and control measures, but cannot adopt the explosion-proof prevention and control measures alone.
5. The process for the charging and mixing of combustible powders according to claim 1, characterized in that the means of discharge of said process are: and a waterfall device (6) is arranged on the mixing bin (2) and is used for the waterfall of dust explosion of the mixing bin (2).
6. The process for the charging and mixing of combustible powders according to claim 1, characterized in that the operations before the process are carried out are preset in the control system and the whole operation is started manually.
7. An explosion-proof system for combustible powder feeding and mixed dust, which is applied to the combustible powder feeding and mixing method of any one of claims 1-6, and is characterized by comprising the following steps:
a feeding station (1), wherein the feeding station (1) comprises a first filter (3) positioned at the top of the feeding station, an upper feeding port (10) and an internal rotary valve (5); the first filter (3) is communicated with a first compressed air pipeline (22) and a first exhaust pipeline (23);
a mixing bin (2), wherein the mixing bin (2) comprises a second filter (7) and a waterfall device (6) which are positioned at the top of the mixing bin, an internal stirrer (18), a first level indicator (19) at the upper part, a second level indicator (20) at the lower part and a mixing bin outlet (21) at the bottom; the top of the mixing bin (2) is communicated with a first nitrogen pipeline (25) and a second compressed air pipeline (26), and the bottom of the mixing bin is communicated with a third nitrogen pipeline (29); the bottom of the feeding station (1) is communicated with the top of the mixing bin (2) through a feeding pipeline (24);
the dust removal system (31), the dust removal system (31) front end is connected with induced draft cover (30), induced draft cover (30) are located near the dust concentration probe (4) near dog-house (10).
8. Combustible powder dosing and dust mixing explosion protection system according to claim 1, characterised in that the second filter (7) is connected to a second exhaust duct (27) and a second nitrogen duct (28); and an oxygen concentration detection instrument (13) is arranged on the second exhaust pipeline (27).
9. The combustible powder feeding and dust mixing explosion-proof system according to claim 1, wherein the rotary valve (5) is a rotary valve with explosion-proof function; a magnetic separation device is also arranged in the feeding station (1).
10. The combustible powder feeding and mixed dust explosion-proof system according to claim 1, wherein the said discharge device (6) adopts a mode of arranging a discharge conduit or a flameless discharge device; the bleed conduit directs the explosion out of the chamber.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010444166.8A CN111569754A (en) | 2020-05-22 | 2020-05-22 | Combustible powder feeding and mixing method and dust explosion-proof system |
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| CN202010444166.8A CN111569754A (en) | 2020-05-22 | 2020-05-22 | Combustible powder feeding and mixing method and dust explosion-proof system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115814671A (en) * | 2022-05-20 | 2023-03-21 | 宁德时代新能源科技股份有限公司 | Powder conveying device, control method thereof and battery slurry production equipment |
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| CN115814671A (en) * | 2022-05-20 | 2023-03-21 | 宁德时代新能源科技股份有限公司 | Powder conveying device, control method thereof and battery slurry production equipment |
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Application publication date: 20200825 |
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