CN113713948A - Stone coal recycling device and method - Google Patents
Stone coal recycling device and method Download PDFInfo
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- CN113713948A CN113713948A CN202111004909.0A CN202111004909A CN113713948A CN 113713948 A CN113713948 A CN 113713948A CN 202111004909 A CN202111004909 A CN 202111004909A CN 113713948 A CN113713948 A CN 113713948A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
- B02C23/20—Adding fluid, other than for crushing or disintegrating by fluid energy after crushing or disintegrating
- B02C23/22—Adding fluid, other than for crushing or disintegrating by fluid energy after crushing or disintegrating with recirculation of material to crushing or disintegrating zone
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
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- Food Science & Technology (AREA)
- Disintegrating Or Milling (AREA)
- Combined Means For Separation Of Solids (AREA)
Abstract
The invention provides a pebble coal recycling device and a pebble coal recycling method, which structurally comprise an outward conveying device, a sorting device and a material returning device, wherein the outward conveying device comprises a pebble coal collecting bin which is positioned below a roller type coal mill, a net-shaped separating bin is connected with a mechanical separating bin, a ball mill separating module is connected with an outlet of the mechanical separating bin, a building material type material collecting bin is connected with an outlet of the ball mill separating module, a collecting pipe is connected with the ball mill separating module, a cloth bag dust remover is arranged above a coal dust bin, a coal dust bin pump is connected with a discharge port of the coal dust bin, one end of the material returning pipe is connected with the bottom of the coal dust bin pump, and the other end of the material returning pipe is connected with a coal dropping pipe of the roller type coal mill. The invention realizes the outward transportation, separation and material return of the pebble coal, solves the technical problem of the reutilization of the pebble coal, separates the coal energy containing the calorific value in the pebble coal to the maximum extent through the ball mill separation module, and adds the coal powder into the coal dropping pipe of the roller coal mill to realize the on-site utilization.
Description
Technical Field
The invention relates to the technical field of ore resource recycling, in particular to a pebble coal recycling device and a pebble coal recycling method.
Background
The pebble coal is the impurity, gangue or coal particles discharged during the operation of the roller coal mill. The pebble coal has a certain amount of heat value and certain market value. But the utilization of pebble coal is not high due to technical and cost limitations.
The utilization of the pebble coal is mainly divided into three steps: carrying out outward, sorting and returning, namely firstly, collecting pebble coal from a plurality of roller coal mills to one position for centralized treatment; secondly, the pebble coal is sorted so as to be used fully; and finally, conveying the sorted coal, gangue and impurities to a subsequent process to realize secondary utilization. However, in the implementation stage, the transportation, the separation and the return of the pebble coal are not carried out in the same place, the process is dispersed, the recycling in the plant cannot be realized, and a device capable of completely realizing the three steps does not exist at present, so that the recycling of the pebble coal in the plant is greatly limited.
Disclosure of Invention
The invention aims to provide a pebble coal recycling device and a pebble coal recycling method, wherein three steps of outward transportation, sorting and returning of pebble coal are integrated into one device to be completed, and the pebble coal can be recycled.
The invention provides a pebble coal recycling device which comprises an outward transporting device, a sorting device and a material returning device, wherein the outward transporting device comprises a pebble coal collecting bin, a conveying pipeline, a mechanical separation bin and a net-shaped separation bin; the reticular separation bin is connected with the mechanical separation bin through a pipeline, and the reticular separation bin is connected with the negative pressure power module;
the sorting device comprises a ball mill separation module, a building material type material collection bin and a collection pipe, wherein the ball mill separation module is connected with an outlet of the mechanical separation bin, the building material type material collection bin is connected with an outlet of the ball mill separation module through a vibrating screen and a spiral discharging device, and one end of the collection pipe is connected with the ball mill separation module;
the material returning device comprises a pulverized coal bin, a pulverized coal bin pump and a material returning pipe, the other end of the collecting pipe is connected with the pulverized coal bin, and one side of the pulverized coal bin pump is connected with an air compressor; a bag-type dust collector is arranged above the pulverized coal bin, and an induced draft fan is arranged at the top of the pulverized coal bin; the coal powder bunker pump is connected with a discharge hole of the coal powder bunker, a coal powder bunker pump pneumatic gate valve is arranged between the coal powder bunker pump and the coal powder bunker, one end of the return pipe is connected with the bottom of the coal powder bunker pump, and the other end of the return pipe is connected with a coal dropping pipe of the roller coal mill.
Further, build material class material and collect the storehouse through arrange the material pipe with netted separation storehouse is connected, build material class material collect the storehouse with be equipped with between the netted separation storehouse build material class material and collect the storehouse push-pull valve.
Furthermore, the included angle between the return pipe and the coal dropping pipe is less than 15 degrees, and the positive pressure air flow in the return pipe is less than 1 percent of the positive pressure air flow of the roller coal mill.
Furthermore, the mechanical separation bin is of a double-chamber structure, and the bottoms of the two-chamber structure of the mechanical separation bin are respectively provided with an electric double-layer flap valve.
Further, the storehouse is collected to the pebble coal with be equipped with the pneumatic push-pull valve of pebble coal emission between the roller-type coal pulverizer, the storehouse is collected to the pebble coal with be equipped with the pneumatic push-pull valve of storehouse is collected to the pebble coal between the conveying pipeline, be equipped with the negative pressure wind butterfly valve that admits air on the lateral wall in storehouse is collected to the pebble coal.
Furthermore, the number of the pulverized coal bunker pumps is two, and the two pulverized coal bunker pumps are respectively connected with the pulverized coal bunkers.
Furthermore, a bin pump pulverized coal sending pneumatic gate valve is arranged between the pulverized coal bin pump and the material return pipe, and a material level meter is arranged in the pulverized coal bin pump.
According to another object of the invention, the invention provides a method for recycling stone coal, which comprises the following steps:
the method comprises the following steps: starting a negative pressure power module, generating negative pressure in the conveying pipeline, closing the pebble coal discharging pneumatic gate valve, sequentially opening a negative pressure air inlet butterfly valve and the pebble coal collecting bin pneumatic gate valve, and leading the pebble coal in the pebble coal collecting bin into the conveying pipeline by negative pressure air;
step two: the pebble coal is conveyed into a mechanical separation bin through a conveying pipeline for separation, and two groups of double-layer flap valves are arranged at the bottom of the mechanical separation bin and can discharge materials under the condition that the interior of the bin keeps negative pressure;
step three: pebble coal is discharged into a ball mill separation module, a ball mill drives steel balls to grind lighter and softer coal particles, and harder and heavier materials which are not easy to grind are discharged into a building material type material collection bin through a spiral discharging machine;
hot air from the negative pressure power module is blown in from an inlet of the ball mill separation module, and negative pressure air from the induced draft fan is matched with the hot air to bring pulverized coal into the pulverized coal bin and the bag-type dust collector;
step four: the materials falling into the building material collecting bin are led to the reticular separation bin by negative pressure air and are discharged out along with the opening of a gate valve of the building material collecting bin;
step five: the pulverized coal entering the pulverized coal bunker and the bag-type dust collector falls into the pulverized coal bunker pump along with the opening of the pneumatic gate valve of the pulverized coal bunker pump when reaching a set material level, the pneumatic gate valve of the pulverized coal bunker pump is closed when the pulverized coal bunker pump reaches a specified material level, the pneumatic gate valve of the pulverized coal bunker pump is opened to send pulverized coal to the bunker pump, and a pulverized coal returning program is started;
step six: the air compressor provides compressed air, and simultaneously the compressed air is injected into the pulverized coal bin pump, and the compressed air pushes pulverized coal to enter the return pipe and enter the roller type coal mill for secondary air separation.
Furthermore, the mechanical separation bin is of a double-chamber structure, one chamber receives materials, the other chamber discharges materials, and a temperature sensor, a differential pressure transmitter and a material level meter are arranged in the mechanical separation bin to monitor the state of the pebble coal.
Further, in the sixth step, when the pressure value of the air compressor is close to 0, the coal powder in the coal powder bin pump is conveyed completely, at the moment, the bin pump is closed quickly, the coal powder sending pneumatic gate valve is closed, the coal powder warehousing pump pneumatic gate valve is opened, and the coal powder is loaded continuously for the next material returning.
The technical scheme of the invention realizes outward transportation, separation and material return of the pebble coal in a limited space, fully-closed and fully-automatic solves the technical problem of reutilization of the pebble coal, separates coal energy containing calorific value in the pebble coal to the maximum extent through the ball mill separation module, and feeds the coal powder back to the coal dropping pipe of the roller coal mill, thereby realizing on-site utilization.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
description of reference numerals:
in the figure, 1-pebble coal collecting bin, 2-roller coal mill, 3-blanking pipe, 4-powder discharging pipe, 5-pebble coal discharging pneumatic gate valve, 6-negative pressure air inlet butterfly valve, 7-conveying pipeline, 8-pebble coal collecting bin pneumatic gate valve, 9-mechanical separating bin, 10-electric double-layer flap valve, 11-mesh separating bin, 12-connecting pipeline, 13-negative pressure power module, 14-standby negative pressure power module, 15-ball mill separating module, 16-building material collecting bin, 17-discharging pipe, 18-building material collecting bin gate valve, 19-collecting pipe, 20-pulverized coal bin, 21-pulverized coal bin pump, 22-air compressor, 23-bag dust remover, 24-induced draft fan, 25-pulverized coal warehousing pump pneumatic gate valve, 26-return pipe, 27-warehouse pump pulverized coal sending pneumatic gate valve, 28-vacuum pump exhaust butterfly valve, 29-slag warehouse, 30-warehouse pump pulverized coal sending pneumatic gate valve;
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. 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 "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1:
the utility model provides a cyclic utilization device of pebble coal, includes pebble coal collecting bin 1, and pebble coal collecting bin 1 is located roller mill 2's discharge gate below, is responsible for collecting the pebble coal that roller mill 2 discharged. According to actual practical needs, the pebble coal collecting bin 1 can be provided with a butt-jet level gauge, an access door, a square hole comb, a Venturi delivery pipe or a positive pressure air interface and the like.
A blanking pipe 3 and a powder discharge pipe 4 are connected above the roller coal mill 2. A pebble coal discharge pneumatic gate valve 5 is arranged between the pebble coal collecting bin 1 and the roller coal mill 3, and a negative pressure air inlet butterfly valve 6 is arranged on the side wall of the pebble coal collecting bin 1. One end of the conveying pipeline 7 is connected with the pebble coal collecting bin 1, and a pebble coal collecting bin pneumatic gate valve 8 is arranged between the pebble coal collecting bin 1 and the conveying pipeline 7. The pebble coal cleaning in the pebble coal collecting bin 1 can be completed by the sequential actions of the pebble coal discharging pneumatic gate valve 5, the negative pressure air inlet butterfly valve 6 and the pebble coal collecting bin pneumatic gate valve 8. The number of the pebble coal collecting bins 1 is equal to that of the roller coal mills 2 which need to discharge pebble coal outwards.
The other end of the conveying pipeline 7 is connected with the mechanical separation bin 9, and the conveying pipeline 7 is responsible for conveying the pebble coal in the pebble coal collection bin 1 to the mechanical separation bin 9. The conveying pipeline 7 penetrates through all the roller coal mills 2 which need to discharge pebble coal. The mechanical separation bin 9 is used for storing and discharging the collected pebble coal. The mechanical separation bin 9 is of a double-chamber structure, one chamber is used for receiving materials, the other chamber is used for discharging materials, and a temperature sensor, a differential pressure transmitter and a material level meter are arranged in the mechanical separation bin 9 and used for monitoring the state of the pebble coal. The bottom of the two-chamber structure of the mechanical separation bin 9 is respectively provided with an electric double-layer flap valve 10, and the outlet of the mechanical separation bin 9 is provided with two electric double-layer flap valves 10 for keeping the bin body negative pressure. The bin outlet of the mechanical separation bin 9 is not less than 5 meters from the ground so as to install the ball mill separation module 15.
The reticular separation cabin 11 is connected with the mechanical separation cabin 9 through a connecting pipeline 12, and the reticular separation cabin 11 is connected with a negative pressure power module 13; the mesh-shaped separation chamber 11 can also be connected with a standby negative pressure power module 14. The hot air port of the negative pressure power module 13 or the standby negative pressure power module 14 is connected with the inlet of the ball mill separation module 15 through a pipeline, and a vacuum pump exhaust butterfly valve 28 is arranged between the hot air port of the negative pressure power module 13 or the standby negative pressure power module 14 and the inlet of the ball mill separation module 15. Hot air from the negative pressure power module 13 is blown in from an inlet of the ball mill separation module 15, and negative pressure air from the induced draft fan 24 is matched with the hot air to bring coal powder into the coal powder bin 20 and the bag-type dust collector 23.
The ball mill separation module 15 is connected with an outlet of the mechanical separation bin 9, and the ball mill separation module 15 is responsible for grinding the pebble coal into powder and removing pebbles, metal minerals and impurities in the pebble coal, namely removing harder and heavier substances as building material materials for treatment.
Building materials class material collection storehouse 16 passes through the shale shaker with ball mill separation module 15 export and is connected with spiral discharge device, and bushing plate, baffle in the ball mill pass through the spiral curve design, can utilize density to select separately the principle, will be located the heavier material of mill barrel bottom during the rotation and discharge in building materials class material collection storehouse 16.
Building materials material collecting bin 16 is connected with netted separating bin 11 through arranging material pipe 17, and the one end and the mechanical separating bin 9 of connecting line 12 are connected two, and the other end and the row of material pipe 17 of connecting line 12 are connected to realize being connected between mechanical separating bin and netted separating bin 11.
A building material collecting bin gate valve 18 is arranged between the building material collecting bin 16 and the reticular separation bin 11. When the gate valve 18 of the building material collection bin under the building material collection bin 16 is opened, negative pressure air enters the pipeline, the building material is guided to the reticular separation bin 11 by air and is discharged to the slag bin 29, and a bin pump coal powder sending pneumatic gate valve 30 is arranged between the reticular separation bin 11 and the slag bin 29.
One end of the collecting pipe 19 is connected with the ball mill separation module 15; the other end of the collecting pipe 19 is connected with a pulverized coal bunker 20, and one side of a pulverized coal bunker pump 21 is connected with an air compressor 22; a bag-type dust collector 23 is arranged above the pulverized coal bin 20, and an induced draft fan 24 is arranged at the top of the pulverized coal bin 20; the pulverized coal bunker pumps 21 are connected with the discharge hole of the pulverized coal bunker 20, the number of the pulverized coal bunker pumps 21 is two, and the two pulverized coal bunker pumps 21 are respectively connected with the pulverized coal bunker 20. The collecting pipe 19 takes the exhaust of the vacuum pump of the negative pressure power module 13 and the induced draft fan 24 of the bag-type dust collector 23 as power, and the wind-carried powder enters the bag-type dust collector 23 and the coal powder bin 20 through the collecting pipe 19.
A pulverized coal warehousing pump pneumatic gate valve 25 is arranged between the pulverized coal bunker pump 21 and the pulverized coal bunker 20, and the bag-type dust collector 23 is responsible for collecting and storing pulverized coal separated from the ball mill separation module 15. The pulverized coal bunker pump 21 is supplied with pulverized coal through a pneumatic gate valve 25 of the bunker coal bunker pump.
One end of the return pipe 26 is connected with the bottom of the pulverized coal bunker pump 21, a bunker pump pulverized coal sending pneumatic gate valve 27 is arranged between the pulverized coal bunker pump 21 and the return pipe 26, the pulverized coal bunker pump 21 is a positive pressure sending bunker, and compressed air is injected through the air compressor 22 to convey pulverized coal in the pulverized coal bunker pump 21 to the return pipe 26 bin by bin.
When the material level reaches a specified height, the pneumatic gate valve 25 of the pulverized coal warehousing pump is closed, and the pneumatic gate valve for delivering pulverized coal of the warehousing pump is opened, so that positive pressure air-pushing conveying is realized.
The other end of the return pipe 26 is connected with the coal dropping pipe 4 of the roller mill 2. The return pipe 26 is responsible for blowing the coal dust into the coal chute 3 of the roller mill 2. The included angle between the return pipe 26 and the coal breakage pipe 3 is less than 15 degrees, and the interference to the coal breakage is reduced. The positive pressure air flow in the return pipe 26 should be less than 1% of the positive pressure air flow of the roller coal mill 2, so as not to affect the winnowing process of the roller coal mill.
A method for recycling pebble coal comprises the following steps:
the method comprises the following steps: starting a negative pressure power module 13, generating negative pressure in the conveying pipeline 7, closing the pebble coal discharging pneumatic gate valve 5, opening a negative pressure air inlet butterfly valve 6 and the pebble coal collecting bin pneumatic gate valve 8 in sequence, and leading the pebble coal in the pebble coal collecting bin 1 into the conveying pipeline 7 by negative pressure air;
step two: the pebble coal is conveyed into a mechanical separation bin 11 through a conveying pipeline 7 for separation, and two electric double-layer flap valves 10 are arranged at an outlet of the mechanical separation bin 9 and used for keeping the bin body at negative pressure and discharging under the state that the bin body is kept at the negative pressure;
step three: pebble coal is discharged into a ball mill separation module 15, a ball mill drives steel balls to grind lighter and softer coal particles, and meanwhile harder and heavier materials which are not easy to grind are discharged into a building material collection bin 16 through a spiral discharging machine;
hot air from the negative pressure power module 13 is blown in from an inlet of the ball mill separation module 15, and negative pressure air from the induced draft fan 24 is matched with the hot air to bring pulverized coal into the pulverized coal bin 20 and the bag-type dust collector 23;
step four: the materials falling into the building material collecting bin 16 are led to the reticular separation bin 11 by negative pressure air and are discharged out along with the opening of the gate valve 18 of the building material collecting bin;
step five: when the coal powder entering the coal powder bin 20 and the bag-type dust collector 23 reaches a set material level, the coal powder falls into the coal powder bin pump 21 along with the opening of the pneumatic gate valve 25 of the coal powder bin pump, when the coal powder bin pump 21 reaches a specified material level, the pneumatic gate valve 25 of the coal powder bin pump is closed, the pneumatic gate valve 27 of the bin pump coal powder delivery is opened, and a coal powder returning program is started;
step six: the air compressor 22 provides compressed air to inject into the pulverized coal bunker pump 21, and the compressed air pushes pulverized coal into the return pipe 26 and enters the roller coal mill 2 for secondary air separation. When the pressure value of the air compressor is close to 0, the coal powder in the coal powder bin pump is conveyed completely, at the moment, the bin pump is quickly closed, the coal powder sending pneumatic gate valve is quickly closed, the coal powder warehousing pump pneumatic gate valve is opened, and the coal powder is continuously loaded for the next material returning.
The device collects pebble coal discharged by a roller coal mill 2 into a pebble coal collecting bin 1 for storage, pebble coal in the pebble coal collecting bin 1 falls into a ball mill of a ball mill separating module 15 through a conveying pipeline 7 and a mechanical separating bin 9 to be ground into powder, and heavier impurities and metal minerals are collected by a vibrating screen, an iron remover and a building material collecting bin 16 and are led to a slag bin by negative pressure air to be discharged outside; the exhaust of the negative pressure power module 13 (vacuum pump) enters the ball mill, the coal dust with lighter air separation enters the bag-type dust remover 23 for gas-liquid separation, the collected coal dust is discharged into the coal dust bin pump 21, the collected coal dust is pushed back into the coal dropping pipe 4 of the roller coal mill by positive pressure air, secondary air separation is carried out by the roller coal mill 2, and the qualified coal dust and the coal dust ground by the roller coal mill 2 are supplied to a subsequent process through the powder discharge pipe 3. The whole device is closed-loop and automatically realizes the cyclic utilization of coal resources. By adopting the device and the method, the pebble coal can be taken out from a power plant or a coal chemical industry enterprise, the stone coal can be separated on site, the materials can be returned on site, the building material waste can be conveyed into the slag bin on site, the whole in-plant circulation is realized, the occupied area is small, and the whole closed environment is realized. The full-closed internal circulation is really realized, the whole process does not need human intervention, and the full-automatic operation is realized.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The pebble coal recycling device is characterized by comprising an outward conveying device, a sorting device and a material returning device, wherein the outward conveying device comprises a pebble coal collecting bin, a conveying pipeline, a mechanical separation bin and a net-shaped separation bin; the reticular separation bin is connected with the mechanical separation bin through a pipeline, and the reticular separation bin is connected with the negative pressure power module;
the sorting device comprises a ball mill separation module, a building material type material collection bin and a collection pipe, wherein the ball mill separation module is connected with an outlet of the mechanical separation bin, the building material type material collection bin is connected with an outlet of the ball mill separation module through a vibrating screen and a spiral discharging device, and one end of the collection pipe is connected with the ball mill separation module;
the material returning device comprises a pulverized coal bin, a pulverized coal bin pump and a material returning pipe, the other end of the collecting pipe is connected with the pulverized coal bin, and one side of the pulverized coal bin pump is connected with an air compressor; a bag-type dust collector is arranged above the pulverized coal bin, and an induced draft fan is arranged at the top of the pulverized coal bin; the coal powder bunker pump is connected with a discharge hole of the coal powder bunker, a coal powder bunker pump pneumatic gate valve is arranged between the coal powder bunker pump and the coal powder bunker, one end of the return pipe is connected with the bottom of the coal powder bunker pump, and the other end of the return pipe is connected with a coal dropping pipe of the roller coal mill.
2. The apparatus as claimed in claim 1, wherein the material collecting bin is connected to the mesh-type separating bin via a discharging pipe, and a gate valve is disposed between the material collecting bin and the mesh-type separating bin.
3. The pebble coal recycling device of claim 1, wherein an included angle between the return pipe and the coal dropping pipe is less than 15 degrees, and the positive pressure air flow in the return pipe is less than 1% of the positive pressure air flow of the roller coal mill.
4. The pebble coal recycling device according to claim 1, wherein the mechanical separation bin is of a double-chamber structure, and the bottoms of the two-chamber structure of the mechanical separation bin are respectively provided with an electric double-layer flap valve.
5. The pebble coal recycling device according to claim 1, wherein a pebble coal discharging pneumatic gate valve is arranged between the pebble coal collecting bin and the roller coal mill, a pebble coal collecting bin pneumatic gate valve is arranged between the pebble coal collecting bin and the conveying pipeline, and a negative pressure air inlet butterfly valve is arranged on the side wall of the pebble coal collecting bin.
6. The pebble coal recycling device according to claim 1, wherein the number of the pulverized coal bunker pumps is two, and the two pulverized coal bunker pumps are respectively connected with the pulverized coal bunkers.
7. The pebble coal recycling device according to claim 1, wherein a bin pump pulverized coal sending pneumatic gate valve is arranged between the pulverized coal bin pump and the return pipe, and a level meter is arranged in the pulverized coal bin pump.
8. A stone coal recycling method is characterized by comprising the following steps:
the method comprises the following steps: starting a negative pressure power module, generating negative pressure in the conveying pipeline, closing the pebble coal discharging pneumatic gate valve, sequentially opening a negative pressure air inlet butterfly valve and the pebble coal collecting bin pneumatic gate valve, and leading the pebble coal in the pebble coal collecting bin into the conveying pipeline by negative pressure air;
step two: the pebble coal is conveyed into a mechanical separation bin through a conveying pipeline for separation, and two groups of double-layer flap valves are arranged at the bottom of the mechanical separation bin and can discharge materials under the condition that the interior of the bin keeps negative pressure;
step three: pebble coal is discharged into a ball mill separation module, a ball mill drives steel balls to grind lighter and softer coal particles, and harder and heavier materials which are not easy to grind are discharged into a building material type material collection bin through a spiral discharging machine;
hot air from the negative pressure power module is blown in from an inlet of the ball mill separation module, and negative pressure air from the induced draft fan is matched with the hot air to bring pulverized coal into the pulverized coal bin and the bag-type dust collector;
step four: the materials falling into the building material collecting bin are led to the reticular separation bin by negative pressure air and are discharged out along with the opening of a gate valve of the building material collecting bin;
step five: the pulverized coal entering the pulverized coal bunker and the bag-type dust collector falls into the pulverized coal bunker pump along with the opening of the pneumatic gate valve of the pulverized coal bunker pump when reaching a set material level, the pneumatic gate valve of the pulverized coal bunker pump is closed when the pulverized coal bunker pump reaches a specified material level, the pneumatic gate valve of the pulverized coal bunker pump is opened to send pulverized coal to the bunker pump, and a pulverized coal returning program is started;
step six: the air compressor provides compressed air to be injected into the pulverized coal bin pump, and the compressed air pushes pulverized coal to enter the return pipe and enter the roller type coal mill for secondary air separation.
9. The method of claim 8, wherein the mechanical separation chamber is a dual chamber structure, one chamber is filled with materials, the other chamber is filled with materials, and a temperature sensor, a differential pressure transmitter and a level indicator are arranged in the mechanical separation chamber to monitor the state of the pebble coal.
10. The method for recycling stone coal according to claim 8, wherein in the sixth step, when the pressure value of the air compressor is close to 0, the coal powder in the coal powder bin pump is completely conveyed, at the moment, the bin pump coal powder is quickly closed to send the pneumatic gate valve, the coal powder bin pump pneumatic gate valve is opened, and the coal powder is continuously loaded for the next material return.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111004909.0A CN113713948B (en) | 2021-08-30 | 2021-08-30 | Stone coal recycling device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111004909.0A CN113713948B (en) | 2021-08-30 | 2021-08-30 | Stone coal recycling device and method |
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| Publication Number | Publication Date |
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| CN113713948A true CN113713948A (en) | 2021-11-30 |
| CN113713948B CN113713948B (en) | 2023-03-24 |
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| CN202111004909.0A Active CN113713948B (en) | 2021-08-30 | 2021-08-30 | Stone coal recycling device and method |
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| CN114669233A (en) * | 2022-04-20 | 2022-06-28 | 北京干雾科技有限公司 | Device and method for mixed utilization of pebble coal and coal gasification fine slag |
| CN114932003A (en) * | 2022-05-18 | 2022-08-23 | 北京干雾科技有限公司 | Ball mill for sorting pebble coal |
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| CN113713948B (en) | 2023-03-24 |
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