CN115448309A - Pulverized coal recycling system and method - Google Patents
Pulverized coal recycling system and method Download PDFInfo
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- CN115448309A CN115448309A CN202210845867.1A CN202210845867A CN115448309A CN 115448309 A CN115448309 A CN 115448309A CN 202210845867 A CN202210845867 A CN 202210845867A CN 115448309 A CN115448309 A CN 115448309A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/318—Preparation characterised by the starting materials
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/39—Apparatus for the preparation thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
The invention discloses a pulverized coal recycling system and a recycling method thereof, wherein the pulverized coal recycling system comprises a briquetting system and a pulverized coal recycling system connected with the briquetting system; the briquetting and forming system comprises a briquetting system, and a material distribution system and a crushing and screening system which are respectively connected with the briquetting system, wherein the material distribution system is connected with a blanking system; the coal dust recycling system comprises a coal dust recycling system, and an impurity removing system and a coal dust utilizing system which are sequentially connected with the coal dust recycling system. The invention realizes the automatic control of material briquetting and coal dust recovery based on the existing DCS distributed control system, further realizes the accurate control of the process and the process parameters, and realizes the continuous work of briquetting the material and recovering the coal dust; the invention can also recover the coal dust escaping, overflowing, dripping, leaking and leaking from the sub-equipment in the workshop, and solves the problems of coal dust pollution and waste.
Description
Technical Field
The invention relates to the technical field of activated carbon preparation, in particular to a coal dust recycling system and a recycling method thereof.
Background
The activated carbon is a carbon adsorption material, has good chemical stability and thermal stability, can resist acid and alkali corrosion, is insoluble in water and organic solvents, can withstand the action of water immersion, high temperature and high pressure, and can be regenerated after failure; it is widely used for gas adsorption, separation, purification and body purification.
Before the preparation of the activated carbon, the processes of grinding, granulating, briquetting and the like are required to be carried out on the initial raw materials, and the conditions of coal dust escaping, bubbling, dripping, leaking and leaking can occur to some equipment in the briquetting process, and the part of the coal dust is filled in a workshop and mixed with impurities in the workshop environment, so that the workshop environment is polluted; and may be disposed of as dust, resulting in waste of coal dust.
Therefore, a set of coal dust recycling system and a recycling method thereof need to be designed to solve the problems of coal dust pollution and waste caused by coal dust leakage, overflow, dripping, leakage and leakage of partial equipment in a workshop.
Disclosure of Invention
Aiming at the problems, the invention provides a coal dust recycling system and a coal dust recycling method, and the system and the method can recycle coal dust which runs, overflows, drips, leaks and leaks from sub-equipment in a workshop and solve the problems of coal dust pollution and waste.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the coal dust recycling system comprises a briquetting system and a coal dust recycling system connected with the briquetting system;
the briquetting and forming system comprises a briquetting system, and a material distribution system and a crushing and screening system which are respectively connected with the briquetting system, wherein the material distribution system is connected with a blanking system;
the briquetting system comprises a plurality of briquetting machines arranged side by side, and the briquetting machines are provided with a feeding end and a discharging end; the briquetting system is connected with the crushing and screening system through a trench belt conveyor;
the crushing and screening system comprises a plurality of whole grain crushers arranged side by side, and the whole grain crushers are connected with a screening machine through a hoisting machine; the screening machines are arranged side by side and are respectively connected with a No. 1 storage bin and a No. 2 storage bin through screening belt conveyors;
the material distribution system comprises a small material bin connected with the feeding end of the briquetting machine, a large material bin connected with the small material bin through transverse feeding and a large screw connected with the large material bin; the large storage bin is connected with a return storage bin through a pipeline;
the blanking system comprises a plurality of blanking bins arranged side by side and a pulverized coal conveying pipe connected with the blanking bins;
the coal dust recycling system comprises a coal dust recycling system and an impurity removing system and a coal dust utilizing system which are sequentially connected with the coal dust recycling system;
the pulverized coal recovery system comprises a bag-type dust remover and a dust removal fan connected with the bag-type dust remover; the bag-type dust collector is provided with an inlet end and an outlet end, the inlet end is connected with a pulverized coal recovery pipe, the pulverized coal recovery pipe is connected with a pulverized coal recovery branch, and the outlet end is connected with a # 1 airflow conveyor through a # 1 recovery conveyor; the No. 1 airflow conveyor is connected with an impurity removal system through an airflow recovery pipe;
the impurity removal system comprises a washing tank and a drying tank connected with the washing tank through an inclined pipeline, and the drying tank is connected with the pulverized coal utilization system through a No. 2 recycling conveyor;
the pulverized coal utilization system comprises a No. 2 air flow conveyor and a pulverized coal recycling pipe connected with the air flow conveyor, and the pulverized coal recycling pipe is connected with the blanking bin;
the pulverized coal recycling system further comprises a DCS-based distributed control system, and the DCS-based distributed control system is used for controlling the actions of the briquetting and forming system and the pulverized coal recycling system.
As an improvement of the above technical solution, in the briquetting system:
the number of the briquetting machines is two, the two briquetting machines are respectively a No. 1 briquetting machine and a No. 2 briquetting machine, and a vacuum pump is arranged between the No. 1 briquetting machine and the No. 2 briquetting machine.
As an improvement of the above technical solution, in the crushing and screening system:
the number of the whole grain crushers is two, and the two crushers are a No. 1 whole grain crusher and a No. 2 whole grain crusher respectively;
the screening machine is provided with two in quantity, and it is 1# screening machine and 2# screening machine respectively.
As an improvement of the above technical solution, in the material distribution system:
the number of the small storage bins, the number of the transverse feeding bins and the number of the large storage bins are all set to be the same as that of the briquetting machines;
the number of the large storage bins is two, the two large storage bins are a 1# large storage bin and a 2# large storage bin respectively, and the return storage bins are connected with the 1# large storage bin and the 2# large storage bin respectively through pipelines;
the return bin is connected with a return dust remover;
return pumps are arranged between the return bins and the large bins, and the number of the return pumps is the same as that of the large bins;
the large material bin is internally provided with a screening vibration mechanism, the return pump can convey large-particle materials obtained after screening by the screening vibration mechanism of the large material bin to the return material bin, and then the return material bin conveys the large-particle materials to the blanking bin through a pipeline, so that the large-particle materials enter the briquetting and forming system again;
stirring devices are arranged in the small storage bin and the large storage bin;
the large bunker is connected with a blanking system through a large screw; the number of the large spiral is provided with a plurality of large spirals.
As an improvement of the above technical solution, in the blanking system:
the number of the discharging bins is two, and the two discharging bins are a No. 1 discharging bin and a No. 2 discharging bin respectively; the No. 1 blanking bin and the No. 2 blanking bin are both connected with a blanking dust remover and a blanking dust removing fan;
feed bin, 2# down feed bin under 1# are connected through big spiral and the big feed bin of 1#, the big feed bin of 2# respectively, between feed bin and the big feed bin of 1# under 1#, all be provided with the unloading pump under 2# between feed bin and the big feed bin of 2 #.
As an improvement of the technical scheme, the blanking screw, the transverse feeding screw, the large screw, the 1# recycling conveyor and the 2# recycling conveyor are all screw conveyors.
As an improvement of the technical scheme, the number of the pulverized coal recovery branches is provided with a plurality of pulverized coal recovery branches, the pulverized coal recovery branches are provided with recovery ends, and the recovery ends of the pulverized coal recovery branches sequentially extend to the trench belt conveyor, the inlet end of the granule finishing crusher and the inlet end of the sieving machine.
As an improvement of the technical scheme, the bottom of the flushing tank is funnel-shaped, the upper end of the flushing tank is provided with a water inlet, and the bottom end of the flushing tank is provided with a sundry outlet and a coal outlet; the nozzle of the airflow recovery pipe connected with the No. 1 airflow conveyor extends to the bottom of the rinsing tank; the washing tank stores water in advance, and the water surface of the stored water submerges the pipe orifice of the airflow recovery pipe.
As an improvement of the technical scheme, the drying tank is provided with a coal inlet which is inclined downwards, the coal inlet is provided with a screen, and the mesh number of the screen is 4-10 meshes; the side surface of the drying tank is provided with a plurality of negative pressure fans, and the negative pressure fans utilize waste heat generated in the tail gas treatment process of the carbonization furnace to dry the precipitated coal entering the drying tank; a vibrating screen is arranged inside the drying tank and connected with a vibrating motor; and the bottom of the drying tank is connected with a No. 2 recycling conveyor.
The invention also provides a coal dust recycling method, which is applied to any one of the coal dust recycling systems and comprises the following steps:
the method comprises the following steps: starting the apparatus, checking the operating state of the apparatus
The coal dust recycling system is started and closed in a 'reverse opening and closing' mode, namely the starting sequence of equipment in the coal dust recycling system is as follows: the device comprises a 2# air flow conveyor, a 2# recycling conveyor, a negative pressure fan, a vibration motor, a 1# air flow conveyor, a dust removal fan, a bag-type dust remover, a screening belt conveyor, a screening machine, a hoister, a whole grain crusher, a trench belt conveyor, a briquetting machine, a stirring device of a small storage bin, a transverse feeding device, a stirring device of a large storage bin, a screening vibration mechanism of the large storage bin, a large spiral and a return pump.
Step two: conveying, briquetting pulverized coal, crushing and granulating
Coal powder enters a discharging bin through the coal powder clinker pipe, then the coal powder enters the large bin through the large screw, a stirring device of the large bin stirs, crushes and mixes the input coal powder, then a screening vibration mechanism in the large bin screens the stirred and crushed coal powder, the screened small-particle coal powder is conveyed to the small bin through the transverse feeding material, and is conveyed to the briquetting machine for a briquetting process after being secondarily stirred, crushed and mixed by the stirring device in the small bin; large-particle coal powder obtained by screening the large material bin is conveyed to the return material bin through the return pump, and then conveyed to the discharge bin through the return material bin through a pipeline, so that the large-particle coal powder enters the briquetting and forming system again;
conveying the pulverized coal subjected to the briquetting process by the briquetting machine into a granulating crusher through a trench belt conveyor, conveying the pulverized coal subjected to crushing and granulating to the screening machine through a lifting machine, and conveying the pulverized coal which meets the particle specification and is obtained after screening into a 1# stock bin and a 2# stock bin respectively through a screening belt conveyor; conveying the pulverized coal which is screened by the screening machine and does not conform to the particle specification to a blanking bin through a pipeline, so that the part of pulverized coal enters the briquetting and forming system again;
step three: recovering coal powder, removing impurities and drying
In the second implementation step, when the briquetted coal powder is conveyed by the trench belt conveyor, the briquetted coal powder is conveyed to the inlet end of the whole grain crusher by the trench belt conveyor, and the whole grain coal powder is conveyed to the inlet end of the screening machine by the elevator, the coal powder can run, overflow, drip, leak and leak, and the coal powder is mixed with dust and impurities in the workshop environment, at the moment, the started dust removal fan conveys the leaked, overflowed, dripped, leaked and leaked coal powder and dust and impurities mixed with the leaked coal powder into the bag-type dust remover sequentially through the coal powder recovery branch and the coal powder recovery pipe, the coal powder recovered by the bag-type dust remover is conveyed to the No. 1 air flow conveyor through the No. 1 recovery conveyor, then the recovered coal powder is conveyed to the flushing tank through the high-pressure air flow of the No. 1 air flow conveyor, the recovered coal powder is fully mixed with the water stored in the flushing tank under the impact of the high-pressure air flow, then the No. 1 air flow conveyor is closed, and the coal powder mixture in the flushing tank is kept stand for a period, the bottom coal is precipitated and discharged, and the impurities and the impurity liquid and the impurity layer are discharged;
the bottom layer precipitated coal discharged from the coal outlet enters the drying tank through a pipeline, when the bottom layer precipitated coal falls into the bottom of the drying tank through the coal inlet, a pre-started negative pressure fan introduces waste heat generated in a tail gas treatment process of the carbonization furnace into the drying tank, the precipitated coal is dried in the falling process, the dried precipitated coal is partially agglomerated, and at the moment, the agglomerated precipitated coal is vibrated, separated and crushed through a vibrating screen and falls to the bottom of the drying tank through a screen hole of the vibrating screen;
step four: the coal dust is recycled to realize continuous utilization
And conveying the coal powder dried in the third step to a No. 2 airflow conveyor through a No. 2 recovery conveyor, conveying the coal powder into a coal powder recycling pipe through high-pressure airflow by the No. 2 airflow conveyor, and conveying the coal powder to a discharging bin through the coal powder recycling pipe to achieve the purpose of recycling the coal powder.
Compared with the prior art, the technical scheme of the invention has the following technical effects:
1. the invention realizes the automatic control of material briquetting and coal dust recovery based on the existing DCS distributed control system, further realizes the accurate control of the process and the process parameters, and realizes the continuous work of briquetting the material and recovering the coal dust;
2. the coal dust recycling system solves the problems of coal dust pollution and waste caused by coal dust leakage, overflow, dripping, leakage and leakage of partial equipment in a workshop;
3. the return bin is arranged, so that the caking materials screened out from the large bin can be sucked into the return bin through the return pump, and then are conveyed to the discharging bin through the return bin through a pipeline, so that the caking materials enter the briquetting and forming system again, and the purpose of continuously utilizing the caking materials is achieved;
4. the invention adopts the starting and closing mode of 'forward and backward switching', can not only determine whether the equipment for conveying and feeding in the coal powder recycling system and the briquetting and forming system normally operates, but also avoid the occurrence of production accidents caused by material accumulation when the equipment is not started in time due to 'forward switching' of the equipment;
5. according to the invention, the impurity removal system, namely the washing tank and the drying tank, is arranged, so that dust and impurities mixed in the recovered coal dust can be cleaned and clarified, the coal dust precipitated at the bottom of the washing tank is collected and conveyed to the drying tank for drying, and the coal dust with higher purity is obtained and enters the briquetting and forming system again.
Drawings
The invention is further described with reference to the following figures and specific embodiments,
FIG. 1 is a schematic structural diagram of a pulverized coal recycling system according to the present invention;
FIG. 2 is a schematic view of the structure of the rinsing tank and the drying tank according to the present invention;
wherein: 1. a briquetting machine; 2. a trench belt conveyor; 3. a whole grain crusher; 4. a hoist; 5. screening machine; 6. screening a belt conveyor; 7. a No. 1 stock bin; 8. a No. 2 stock bin; 9. a small storage bin; 10. transversely feeding; 11. a large storage bin; 12. a large helix; 13. returning to the stock bin; 14. discharging a bin; 15. a vacuum pump; 16. a return pump; 17. a bag-type dust collector; 18. a dust removal fan; 19. a pulverized coal recovery pipe; 20. a pulverized coal recovery branch; 21. 1# recycling and conveying machine; 22. 1# air conveyor; 23. washing the tank; 2301. a sundry outlet; 2302. a coal outlet; 2303. a water inlet; 2304. an airflow recovery pipe; 24. drying the tank; 2401. a coal inlet; 2402. a screen mesh; 2403. a negative pressure fan; 2404. vibrating screen; 25. 2# recycling conveyor; 26. 2# air conveyor; 27. a coal dust recycling pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "above", "below", "front", "rear", "left", "right", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "disposed," "mounted," "connected," "fixed," "connected," and the like are to be construed broadly and can, for example, be fixedly connected or detachably connected; may be a mechanical connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1 and 2, the present invention provides a coal dust recycling system, which comprises a briquetting system and a coal dust recycling system connected thereto;
the briquetting and forming system comprises a briquetting system, and a material distribution system and a crushing and screening system which are respectively connected with the briquetting system, wherein the material distribution system is connected with a blanking system;
the briquetting system comprises a plurality of briquetting machines 1 arranged side by side, and the briquetting machines 1 are provided with a feeding end and a discharging end; the briquetting system is connected with the crushing and screening system through a trench belt conveyor 2;
the crushing and screening system comprises a plurality of whole grain crushers 3 arranged side by side, and the whole grain crushers 3 are connected with a screening machine 5 through a hoisting machine 4; the screening machines 5 are arranged side by side, and the screening machines 5 are respectively connected with a No. 1 stock bin 7 and a No. 2 stock bin 8 through screening belt conveyors 6;
the material distribution system comprises a small material bin 9 connected with the feeding end of the briquetting machine 1, a large material bin 11 connected with the small material bin 9 through a transverse feeding device 10, and a large spiral 12 connected with the large material bin 11; the large storage bin 11 is connected with a return storage bin 13 through a pipeline;
the blanking system comprises a plurality of blanking bins 14 arranged side by side and a pulverized coal conveying pipe connected with the blanking bins 14;
the coal dust recycling system comprises a coal dust recycling system and an impurity removing system and a coal dust utilizing system which are sequentially connected with the coal dust recycling system;
the coal dust recovery system comprises a bag-type dust remover 17 and a dust removal fan 18 connected with the bag-type dust remover; the bag-type dust collector 17 is provided with an inlet end and an outlet end, the inlet end is connected with a coal powder recovery pipe 19, the coal powder recovery pipe 19 is connected with a coal powder recovery branch 20, and the outlet end is connected with a No. 1 air flow conveyor 22 through a No. 1 recovery conveyor 21; the No. 1 airflow conveyor 22 is connected with an impurity removal system through an airflow recovery pipe 2304;
the impurity removal system comprises a washing tank 23 and a drying tank 24 connected with the washing tank through an inclined pipeline, and the drying tank 24 is connected with the pulverized coal utilization system through a No. 2 recovery conveyor 25;
the coal powder utilization system comprises a No. 2 air flow conveyor 26 and a coal powder recycling pipe 27 connected with the air flow conveyor, wherein the coal powder recycling pipe 27 is connected with the discharging bin 14;
the pulverized coal recycling system also comprises a DCS-based distributed control system, and the control system is used for controlling the actions of the briquetting and forming system and the pulverized coal recycling system.
In the briquetting system of the embodiment of the invention:
briquetting machine 1's quantity is provided with two, and it is 1# briquetting machine and 2# briquetting machine respectively, is provided with vacuum pump 15 between 1# briquetting machine and the 2# briquetting machine, and vacuum pump 15's setting can be taken out the noncondensable gas of briquetting machine 1 inside under the comparatively abominable circumstances of production environment and separate, prevents that briquetting machine 1 from blockking up or trouble.
In the crushing and screening system of the embodiment of the invention:
the number of the whole grain crushers 3 is two, and the two crushers are a No. 1 whole grain crusher and a No. 2 whole grain crusher respectively;
the quantity of screening machine 5 is provided with two, and it is 1# screening machine and 2# screening machine respectively, and screening machine 5 can sieve the material after the whole grain, and the material after the screening passes through screening belt feeder 6 and gets into 1# feed bin 7 and 2# feed bin 8 respectively, and remaining powder after the screening gets into briquetting process again and carries out material briquetting processing.
In the material distributing system of the embodiment of the invention:
the number of the small material bins 9, the number of the transverse feeding materials 10 and the number of the large material bins 11 are all provided with a plurality of small material bins 9, the number of the transverse feeding materials 10 and the number of the large material bins 11 are the same as the number of the briquetting machines 1;
the number of the large storage bins 11 is two, the two large storage bins are a 1# large storage bin and a 2# large storage bin respectively, and the return storage bin 13 is connected with the 1# large storage bin and the 2# large storage bin respectively through pipelines;
the number of the small stock bins 9 is two, and the two small stock bins are a 1# small stock bin and a 2# small stock bin respectively; the number of the horizontal feeding materials 10 is two, and the two horizontal feeding materials are respectively No. 1 horizontal feeding material and No. 2 horizontal feeding material;
the return bin 13 is connected with a return dust remover;
return pumps 16 are arranged between the return bin 13 and the large bin 11, and the number of the return pumps 16 is the same as that of the large bin 11;
a screening vibration mechanism is arranged inside the large storage bin 11, the return pump 16 can convey large granular materials obtained after screening by the screening vibration mechanism of the large storage bin 11 to the return storage bin 13, and then the return storage bin 13 conveys the large granular materials to the blanking bin 14 through a pipeline, so that the large granular materials enter the briquetting and forming system again;
stirring devices are arranged inside the small material bin 9 and the large material bin 11 and connected with stirring motors;
the large storage bin 11 is connected with a blanking system through a large spiral 12; the number of the large spiral 12 is provided with a plurality.
In the blanking system of the embodiment of the invention:
the number of the discharging bins 14 is two, and the two discharging bins are a No. 1 discharging bin and a No. 2 discharging bin respectively; the No. 1 blanking bin and the No. 2 blanking bin are both connected with a blanking dust remover and a blanking dust removing fan;
feed bin, 2# feed bin under 1# are connected through big spiral 12 and the big feed bin of 1#, the big feed bin of 2# respectively, between feed bin and the big feed bin of 1# under 1#, all be provided with the unloading pump under 2# between feed bin and the big feed bin of 2 #.
In the embodiment of the invention, the feeding screw, the transverse feeding screw 10, the large screw 12, the No. 1 recycling conveyor 21 and the No. 2 recycling conveyor 25 are all screw conveyors.
In the embodiment of the invention, the number of the coal powder recovery branches 20 is provided with a plurality of recovery ends, the coal powder recovery branches 20 are provided with recovery ends, and the recovery ends of the coal powder recovery branches 20 sequentially extend to the trench belt conveyor 2, the inlet end of the granule finishing crusher 3 and the inlet end of the sieving machine 5.
In the embodiment of the invention, the bottom of the flushing tank 23 is funnel-shaped, the upper end of the flushing tank 23 is provided with a water inlet 2303, and the bottom end of the flushing tank 23 is provided with a trash outlet 2301 and a coal outlet 2302; the orifice of the airflow recovery pipe 2304 connected with the # 1 airflow conveyor 22 extends to the bottom of the rinsing tank 23; the rinse tank 23 holds water in advance, and the water surface of the held water submerges the orifice of the airflow recovery pipe 2304.
In the embodiment of the invention, the drying tank 24 is provided with a coal inlet 2401 which is inclined downwards, the coal inlet 2401 is provided with a screen 2402, and the mesh number of the screen 2402 ranges from 4 meshes to 10 meshes; a vibrating screen 2404 is arranged inside the drying tank 24, and the vibrating screen 2404 is connected with a vibrating motor; the bottom of the drying tank 24 is in a circular truncated cone shape, a plurality of negative pressure fans 2403 are arranged on the side surface of the drying tank 24, the arrangement positions of the negative pressure fans 2403 are opposite to a vertical plane where the coal inlet 2401 is located, preferably, four negative pressure fans 2403 are arranged, two of the negative pressure fans are arranged above the vibrating screen 2404, one of the negative pressure fans is arranged below the vibrating screen 2404, and the remaining negative pressure fan is arranged on the side surface of the circular truncated cone at the bottom of the drying tank 24;
the negative pressure fan 2403 dries the precipitated coal entering the drying tank 24 by using the waste heat generated in the tail gas treatment process of the carbonization furnace; the bottom of the drying tank 24 is connected with a No. 2 recycling conveyor 25.
The invention also provides a pulverized coal recycling method, which is applied to any one of the pulverized coal recycling systems and comprises the following steps:
the method comprises the following steps: starting the apparatus, checking the operating state of the apparatus
The coal dust recycling system is started and closed in a mode of 'reverse opening and reverse closing', namely the starting sequence of the equipment in the coal dust recycling system is as follows in sequence: the device comprises a 2# airflow conveyor 26, a 2# recovery conveyor 25, a negative pressure fan 2403, a vibration motor, a 1# airflow conveyor 22, a dust removal fan 18, a bag-type dust remover 17, a screening belt conveyor 6, a screening machine 5, a lifting machine 4, a whole grain crusher 3, a trench belt conveyor 2, a briquetting machine 1, a stirring device of a small bunker 9, a transverse feeding material 10, a stirring device of a large bunker 11, a screening vibration mechanism of the large bunker 11, a large screw 12 and a return pump 16.
Step two: conveying, briquetting, crushing and granulating the pulverized coal
After the first step, the pulverized coal enters a discharging bin 14 through the pulverized coal clinker pipe, then the pulverized coal enters the large bin 11 through the large screw 12, a stirring device of the large bin 11 stirs, crushes and mixes the input pulverized coal, then a screening vibration mechanism in the large bin 11 screens the stirred and crushed pulverized coal, the screened small-particle pulverized coal is conveyed to the small bin 9 through the transverse feeding device 10, and is secondarily stirred, crushed and mixed by a stirring device in the small bin 9 and then conveyed to the briquetting machine 1 for a briquetting process; the large-particle coal powder obtained by screening in the large storage bin 11 is conveyed to the return storage bin 13 through the return pump 16, and then the large-particle coal powder is conveyed to the blanking bin 14 through the return storage bin 13 through a pipeline, so that the large-particle coal powder enters the briquetting and forming system again;
the pulverized coal subjected to the briquetting process by the briquetting machine 1 is conveyed into a whole grain crusher 3 through a trench belt conveyor 2, the pulverized coal subjected to crushing and whole grain sizing is conveyed to a screening machine 5 through a lifting machine 4, and the screened pulverized coal meeting the particle specification is conveyed into a 1# bin 7 and a 2# bin 8 through a screening belt conveyor 6 respectively; the pulverized coal which is screened by the screening machine 5 and does not meet the particle specification is conveyed to a blanking bin 14 through a pipeline, so that the part of pulverized coal enters the briquetting and forming system again;
step three: recovering coal powder, removing impurities and drying
In the process of the second implementation step, when the briquetted coal powder is conveyed by the trench belt conveyor 2, the briquetted coal powder is conveyed to the inlet end of the whole grain crusher 3 by the trench belt conveyor 2, and the whole grain coal powder is conveyed to the inlet end of the sieving machine 5 by the hoister 4, the coal powder can run out, overflow, drip, leak and leak, and the coal powder is mixed with dust and impurities in the workshop environment, at the moment, the started dust removal fan 18 sequentially passes through the coal powder recovery branch 20 and the coal powder recovery pipe 19 to suck the leaked, overflowed, dripped, leaked and leaked coal powder and dust and impurities mixed with the leaked coal powder into the bag-type dust remover 17, the coal powder recovered by the bag-type dust remover 17 is conveyed to the No. 1 air flow conveyor 22 through the No. 1 recovery conveyor 21, then the recovered coal powder is conveyed to the flushing tank 23 by the high-pressure air flow of the No. 1 air flow conveyor 22, under the impact of the high-pressure air flow, the recovered coal powder is fully mixed with the water stored in the flushing tank 23, and the mixed coal is discharged from the bottom layer through the bottom layer deposition liquid 2301 and the impurity discharge port for a period of settling coal;
bottom layer precipitated coal discharged from the coal outlet 2302 enters the drying tank 24 through a pipeline, when the bottom layer precipitated coal falls into the bottom of the drying tank 24 through the coal inlet 2401, the negative pressure fan 2403 which is started in advance introduces waste heat generated in the tail gas treatment process of the carbonization furnace into the drying tank 24, the precipitated coal is dried in the falling process, the dried precipitated coal is partially agglomerated, and at the moment, the agglomerated precipitated coal is vibrated, separated and crushed through the vibrating screen 2404 and falls to the bottom of the drying tank 24 through the screen holes of the vibrating screen 2404;
step four: the coal dust is recycled to realize continuous utilization
The coal dust dried in the third step is conveyed to a No. 2 airflow conveyor 26 through a No. 2 recovery conveyor 25, the coal dust is conveyed to a coal dust recycling pipe 27 through a high-pressure airflow by the No. 2 airflow conveyor 26, and then conveyed to the lower storage bin 14 through the coal dust recycling pipe 27, so that the purpose of recycling the coal dust is achieved.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments, or make equivalent substitutions and improvements to part of the technical features of the foregoing embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The coal dust recycling system comprises a briquetting system and a coal dust recycling system connected with the briquetting system;
the briquetting and forming system comprises a briquetting system, and a material distribution system and a crushing and screening system which are respectively connected with the briquetting system, wherein the material distribution system is connected with a blanking system;
the briquetting system comprises a plurality of briquetting machines arranged side by side, and the briquetting machines are provided with a feed end and a discharge end; the briquetting system is connected with the crushing and screening system through a trench belt conveyor;
the crushing and screening system comprises a plurality of whole grain crushers arranged side by side, and the whole grain crushers are connected with a screening machine through a hoisting machine; the screening machines are arranged side by side and are respectively connected with a No. 1 storage bin and a No. 2 storage bin through screening belt conveyors;
the material distribution system comprises a small material bin connected with the feed end of the briquetting machine, a large material bin connected with the small material bin through transverse feeding, and a large screw connected with the large material bin; the large storage bin is connected with a return storage bin through a pipeline;
the blanking system comprises a plurality of blanking bins arranged side by side and a pulverized coal conveying pipe connected with the blanking bins;
the coal dust recycling system comprises a coal dust recycling system and an impurity removing system and a coal dust utilizing system which are sequentially connected with the coal dust recycling system;
the pulverized coal recovery system comprises a bag-type dust remover and a dust removing fan connected with the bag-type dust remover; the bag-type dust collector is provided with an inlet end and an outlet end, the inlet end is connected with a pulverized coal recovery pipe, the pulverized coal recovery pipe is connected with a pulverized coal recovery branch, and the outlet end is connected with a No. 1 air flow conveyor through a No. 1 recovery conveyor; the No. 1 airflow conveyor is connected with an impurity removal system through an airflow recovery pipe;
the impurity removal system comprises a washing tank and a drying tank connected with the washing tank through an inclined pipeline, and the drying tank is connected with the pulverized coal utilization system through a No. 2 recycling conveyor;
the pulverized coal utilization system comprises a No. 2 air flow conveyor and a pulverized coal recycling pipe connected with the air flow conveyor, and the pulverized coal recycling pipe is connected with the blanking bin;
the coal powder recycling system further comprises a distributed control system based on DCS, and the control system is used for controlling the actions of the briquetting and forming system and the coal powder recycling system.
2. The pulverized coal recycling system according to claim 1, characterized in that: in the briquetting system:
the number of briquetting machines is provided with two, and it is 1# briquetting machine and 2# briquetting machine respectively, is provided with the vacuum pump between 1# briquetting machine and the 2# briquetting machine.
3. The pulverized coal recycling system according to claim 1, characterized in that: in the crushing and screening system:
the number of the whole grain crushers is two, and the two crushers are respectively a No. 1 whole grain crusher and a No. 2 whole grain crusher;
the screening machine is provided with two in quantity, and it is 1# screening machine and 2# screening machine respectively.
4. The pulverized coal recycling system according to claim 1, characterized in that: in the material distributing system:
the number of the small storage bins, the number of the transverse feeding bins and the number of the large storage bins are all set to be the same as that of the briquetting machines;
the number of the large storage bins is two, the two large storage bins are a 1# large storage bin and a 2# large storage bin respectively, and the return storage bins are connected with the 1# large storage bin and the 2# large storage bin respectively through pipelines;
the return bin is connected with a return dust remover;
return pumps are arranged between the return bins and the large bins, and the number of the return pumps is the same as that of the large bins;
a screening vibration mechanism is arranged inside the large storage bin;
stirring devices are arranged in the small storage bin and the large storage bin;
the large bunker is connected with a blanking system through a large screw; the number of the large spirals is provided with a plurality.
5. The pulverized coal recycling system according to claim 4, characterized in that: in the blanking system:
the number of the discharging bins is two, and the two discharging bins are a No. 1 discharging bin and a No. 2 discharging bin respectively; the No. 1 blanking bin and the No. 2 blanking bin are both connected with a blanking dust remover and a blanking dust removing fan;
feed bin, 2# down feed bin under 1# are connected through big spiral and the big feed bin of 1#, the big feed bin of 2# respectively, between feed bin and the big feed bin of 1# under 1#, all be provided with the unloading pump under 2# between feed bin and the big feed bin of 2 #.
6. The pulverized coal recycling system according to claim 1, characterized in that: the quantity of buggy recovery branch road is provided with a plurality of, buggy recovery branch road is provided with the recovery end, and the recovery end of buggy recovery branch road extends to trench belt feeder department, the entrance point of whole grain breaker and the entrance point of screening machine in proper order.
7. The pulverized coal recycling system according to claim 1, characterized in that: the bottom of the washing tank is funnel-shaped, the upper end of the washing tank is provided with a water inlet, and the bottom end of the washing tank is provided with a sundry outlet and a coal outlet; the nozzle of the airflow recovery pipe connected with the No. 1 airflow conveyor extends to the bottom of the washing tank; the washing tank stores water in advance, and the water surface of the stored water submerges the pipe orifice of the airflow recovery pipe.
8. The pulverized coal recycling system according to claim 1, characterized in that: the drying tank is provided with a coal inlet which is inclined downwards, the coal inlet is provided with a screen, and the mesh range of the screen is 4-10 meshes; the side surface of the drying tank is provided with a plurality of negative pressure fans, and the negative pressure fans utilize waste heat generated in the tail gas treatment process of the carbonization furnace to dry the precipitated coal entering the drying tank; a vibrating screen is arranged inside the drying tank and connected with a vibrating motor; and the bottom of the drying tank is connected with a No. 2 recycling conveyor.
9. A method for recycling pulverized coal, which is applied to the pulverized coal recycling system according to any one of claims 1 to 8, characterized in that:
the method comprises the following steps:
the method comprises the following steps: starting the apparatus, checking the operating state of the apparatus
The coal dust recycling system is started and closed in a mode of 'reverse opening and reverse closing', namely the starting sequence of the equipment in the coal dust recycling system is as follows in sequence: the device comprises a 2# air flow conveyor, a 2# recycling conveyor, a negative pressure fan, a vibration motor, a 1# air flow conveyor, a dust removal fan, a bag-type dust remover, a screening belt conveyor, a screening machine, a lifter, a whole grain crusher, a trench belt conveyor, a briquetting machine, a stirring device of a small storage bin, a transverse feeding device, a stirring device of a large storage bin, a screening vibration mechanism of the large storage bin, a large spiral and a return pump, and aims to determine whether equipment for conveying and feeding in a pulverized coal recycling system and a briquetting and forming system normally operates.
Step two: conveying, briquetting pulverized coal, crushing and granulating
Coal powder enters a discharging bin through the coal powder clinker pipe, then the coal powder enters the large bin through the large screw, a stirring device of the large bin stirs, crushes and mixes the input coal powder, then a screening vibration mechanism in the large bin screens the stirred and crushed coal powder, the screened small-particle coal powder is conveyed to the small bin through the transverse feeding material, and is conveyed to the briquetting machine for a briquetting process after being secondarily stirred, crushed and mixed by the stirring device in the small bin; large-particle coal powder obtained by screening the large bunker is conveyed to the return bunker through the return pump, and then conveyed to the discharging bunker through the return bunker through a pipeline, so that the large-particle coal powder enters the briquetting and forming system again;
conveying the pulverized coal subjected to the briquetting process by the briquetting machine into a granulating crusher through a trench belt conveyor, conveying the pulverized coal subjected to crushing and granulating to the screening machine through a lifting machine, and conveying the pulverized coal which meets the particle specification and is obtained after screening into a 1# stock bin and a 2# stock bin respectively through a screening belt conveyor; conveying the pulverized coal which is screened by the screening machine and does not meet the particle specification to a blanking bin through a pipeline, so that the part of pulverized coal enters the briquetting and forming system again;
step three: coal dust is recovered and subjected to impurity removal and drying treatment
In the process of the second implementation step, when the briquetted coal powder is conveyed by the trench belt conveyor, the briquetted coal powder is conveyed to the inlet end of the whole grain crusher by the trench belt conveyor, and the whole grain coal powder is conveyed to the inlet end of the screening machine by the elevator, the leakage, the overflow, the dripping, the leakage and the leakage of the coal powder all occur, at the moment, the started dust removing fan sequentially passes through the coal powder recovery branch and the coal powder recovery pipe to suck the leaked, the overflowing, the dripping, the leakage and the leakage of the coal powder into the bag-type dust collector, the coal powder recovered by the bag-type dust collector is conveyed to the No. 1 air flow conveyor by the No. 1 air flow conveyor through the high-pressure air flow of the No. 1 air flow conveyor, the recovered coal powder is fully mixed with the water stored in the flushing tank in advance under the impact of the high-pressure air flow, then the No. 1 air flow conveyor is closed, the bottom precipitated coal is discharged from the coal outlet after the coal powder mixture in the flushing tank is kept stand for a period of time, and the impurity liquid and the impurity on the upper layer of the precipitated coal is discharged from the coal outlet;
the bottom layer precipitated coal discharged from the coal outlet enters the drying tank through a pipeline, when the bottom layer precipitated coal falls into the bottom of the drying tank through the coal inlet, a pre-started negative pressure fan introduces waste heat generated in a tail gas treatment process of the carbonization furnace into the drying tank, the precipitated coal is dried in the falling process, the dried precipitated coal is partially agglomerated, and at the moment, the agglomerated precipitated coal is vibrated, separated and crushed through a vibrating screen and falls to the bottom of the drying tank through a screen hole of the vibrating screen;
step four: the coal dust is recycled to realize continuous utilization
And conveying the coal powder dried in the third step to a No. 2 airflow conveyor through a No. 2 recovery conveyor, conveying the coal powder into a coal powder recycling pipe through high-pressure airflow by the No. 2 airflow conveyor, and conveying the coal powder to a discharging bin through the coal powder recycling pipe to achieve the purpose of recycling the coal powder.
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