CN111229439A - Closed processing system of stone coal - Google Patents

Closed processing system of stone coal Download PDF

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Publication number
CN111229439A
CN111229439A CN202010141087.XA CN202010141087A CN111229439A CN 111229439 A CN111229439 A CN 111229439A CN 202010141087 A CN202010141087 A CN 202010141087A CN 111229439 A CN111229439 A CN 111229439A
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CN
China
Prior art keywords
conveyor
pebble coal
gate valve
pebble
storage tank
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Pending
Application number
CN202010141087.XA
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Chinese (zh)
Inventor
于谦
于博远
王艳
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Beijing Huadian Boyuan Environmental Protection Equipment Co Ltd
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Beijing Huadian Boyuan Environmental Protection Equipment Co Ltd
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Priority to CN202010141087.XA priority Critical patent/CN111229439A/en
Publication of CN111229439A publication Critical patent/CN111229439A/en
Pending legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
    • B65G15/60—Arrangements for supporting or guiding belts, e.g. by fluid jets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G21/00—Supporting or protective framework or housings for endless load-carriers or traction elements of belt or chain conveyors
    • B65G21/20—Means incorporated in, or attached to, framework or housings for guiding load-carriers, traction elements or loads supported on moving surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G47/00—Article or material-handling devices associated with conveyors; Methods employing such devices
    • B65G47/52—Devices for transferring articles or materials between conveyors i.e. discharging or feeding devices
    • B65G47/68—Devices for transferring articles or materials between conveyors i.e. discharging or feeding devices adapted to receive articles arriving in one layer from one conveyor lane and to transfer them in individual layers to more than one conveyor lane or to one broader conveyor lane, or vice versa, e.g. combining the flows of articles conveyed by more than one conveyor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G65/00—Loading or unloading
    • B65G65/30—Methods or devices for filling or emptying bunkers, hoppers, tanks, or like containers, of interest apart from their use in particular chemical or physical processes or their application in particular machines, e.g. not covered by a single other subclass
    • B65G65/34—Emptying devices
    • B65G65/40—Devices for emptying otherwise than from the top
    • B65G65/42—Devices for emptying otherwise than from the top using belt or chain conveyors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G65/00—Loading or unloading
    • B65G65/30—Methods or devices for filling or emptying bunkers, hoppers, tanks, or like containers, of interest apart from their use in particular chemical or physical processes or their application in particular machines, e.g. not covered by a single other subclass
    • B65G65/34—Emptying devices
    • B65G65/40—Devices for emptying otherwise than from the top
    • B65G65/46—Devices for emptying otherwise than from the top using screw conveyors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G69/00—Auxiliary measures taken, or devices used, in connection with loading or unloading
    • B65G69/04—Spreading out the materials conveyed over the whole surface to be loaded; Trimming heaps of loose materials
    • B65G69/045—Spreading out the materials conveyed over the whole surface to be loaded; Trimming heaps of loose materials with scraping devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D31/00—Other cooling or freezing apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
    • B65G2201/04—Bulk
    • B65G2201/045—Sand, soil and mineral ore

Abstract

The invention provides a closed processing system for pebble coal, which comprises: the device comprises a pebble coal storage tank, a manual gate valve, a first pneumatic gate valve, a second pneumatic gate valve, a level indicator, a feeder, a first-stage conveyor, a main conveyor and a tail end conveyor; the manual gate valve is arranged at the inlet of the pebble coal storage tank and is used for being communicated with a pebble coal discharge port of the coal mill, and the first pneumatic gate valve is arranged at the inlet of the pebble coal storage tank and is used for being communicated with the pebble coal discharge port of the coal mill; pebble coal discharged from a pebble coal discharge port of the coal mill passes through a manual gate valve and a first pneumatic plug valve and then enters a pebble coal storage tank; the second pneumatic gate valve is arranged at the outlet of the pebble coal storage tank and communicated with the feeder; the feeder is communicated with the feeding end of the first-stage conveyor. The closed treatment system for the pebble coal enables the coal mill to discharge the pebble coal timely, safely, economically, stably and environmentally.

Description

Closed processing system of stone coal
Technical Field
The invention relates to the technical field of pebble coal treatment, in particular to a closed pebble coal treatment system.
Background
At present, with the wide application of medium-speed coal mills in coal-fired power plants and the change of coal-fired quality, the medium-speed coal mills can generate a large amount of high-temperature pebble coal in the operation process, and how to discharge and treat the high-temperature wastes (pebble coal) of the coal mills in time, safely, economically, stably and environmentally becomes a troublesome problem commonly existing in the global coal-fired power plants at present.
Disclosure of Invention
One of the purposes of the invention is to provide a pebble coal closed treatment system which is connected to a pebble coal discharge port of a coal mill, so that the coal mill can discharge pebble coal timely, safely, economically, stably and environmentally.
The embodiment of the invention provides a closed processing system for pebble coal, which comprises: the device comprises a pebble coal storage tank, a manual gate valve, a first pneumatic gate valve, a second pneumatic gate valve, a level indicator, a feeder, a first-stage conveyor, a main conveyor and a tail end conveyor;
the manual gate valve is arranged at the inlet of the pebble coal storage tank and is used for being communicated with a pebble coal discharge port of the coal mill, and the first pneumatic gate valve is arranged at the inlet of the pebble coal storage tank, is positioned below the manual gate valve and is used for being communicated with the pebble coal discharge port of the coal mill; pebble coal discharged from a pebble coal discharge port of the coal mill passes through the manual gate valve and the first pneumatic plug valve and then enters the pebble coal storage tank;
the second pneumatic gate valve is arranged at the outlet of the pebble coal storage tank and communicated with the feeder;
the feeder is communicated with the feeding end of the primary conveyor;
the discharge end of the primary conveyor is communicated with the feed end of the main conveyor;
the discharge end of the main conveyor is communicated with the tail end conveyor; a cooling component is arranged in the main conveyor and used for cooling the pebble coal;
the level meter is arranged in the pebble coal storage tank and is used for detecting the level in the pebble coal storage tank; when the preset material level in the pebble coal storage tank is detected, the first pneumatic gate valve is automatically closed, then the main conveyor, the first-stage conveyor and the feeder are sequentially started to operate, then the second pneumatic gate valve at the outlet of the pebble coal storage tank is automatically opened, pebble coal is discharged to the first-stage conveyor through the feeder, and the pebble coal discharged from the first-stage conveyor falls into the main conveyor and is finally discharged to the tail end conveyor from the main conveyor; and the tail end conveyor conveys the pebble coal to a slag extractor of a dry slag discharging system.
Preferably, the cooling member includes: an adjustable air inlet door is arranged at the discharge end of the main conveyor, an air pipe is arranged at the feed end of the main conveyor, and an isolation valve is arranged on the air pipe. The main conveyor is internally provided with a conveying belt, pebble coal is conducted and heat exchanged with the conveying belt in the conveying process of the conveying belt, is conducted and heat exchanged with cooling air passing through the upper part of the conveying belt, and is radiated through the main conveyor body.
Preferably, the end conveyor comprises: a secondary conveyor; the feeding end of the secondary conveyor is communicated with the main conveyor; and the discharge end of the secondary conveyor is communicated with a slag extractor of the dry slag discharging system.
Preferably, the closed processing system for pebble coal further comprises: a pebble coal bunker; the end conveyor includes: a bucket elevator; the bucket elevator is arranged at the discharge end of the main conveyor and is used for conveying the pebble coal conveyed by the main conveyor to the pebble coal bin.
Preferably, the closed processing system for pebble coal further comprises: a pebble coal bunker; and the feed end of the pebble coal bin is communicated with the discharge end of the main conveyor.
Preferably, an automatic flattening device is further arranged in the main conveyor and is used for flattening the pebble coal in the main conveyor.
Preferably, the primary conveyor and the secondary conveyor include: a steel belt conveyor or a chain plate conveyor or a screw conveyor;
the main conveyor includes: a steel belt conveyor or a chain plate conveyor.
Preferably, the air pipe is communicated with a flue at the tail part of the boiler through the isolation valve, or is communicated with a dry slag discharge system, or is communicated with a top filter of the pebble coal bunker.
Preferably, the main conveyor includes: the device comprises a main body, a carrying carrier roller, a rotary carrier roller, a guard plate, two sealing devices, a conveying steel belt and an upper cover plate;
the carrying carrier roller and the rotary carrier roller are respectively and fixedly connected with the main body; the bearing carrier roller is positioned above the rotary carrier roller, the conveying steel belt is in a closed ring shape, one part of the conveying steel belt is positioned on the bearing carrier roller, and the other part of the conveying steel belt is positioned on the rotary carrier roller; the left end and the right end of the conveying steel belt are respectively provided with a baffle plate, and the baffle plates are fixedly connected with the conveying steel belt; the guard plate is positioned between the carrying carrier roller and the revolving carrier roller; the upper cover plate is arranged at an opening above the main body; the two sealing devices are symmetrically arranged steel wire brushes, are positioned on two sides of the conveying steel belt above the bearing carrier roller and are positioned between the two baffles.
Preferably, the sealing device is fixedly connected with the bottom end of the upper cover plate through a fixing body;
or the like, or, alternatively,
the main conveyor further comprises: one end of each material guide plate is fixedly arranged with the main body, and the other end of each material guide plate is positioned on the inner side of the baffle; the sealing device is fixedly connected with one end, far away from the main body, of the material guide plate.
The closed pebble coal processing system has the following beneficial effects:
the number of the first-stage conveyors can be different according to the capacity of the coal-fired power plant unit. In addition, according to the specific conditions on site, the first-stage conveyor can be eliminated, namely, the pebble coal is directly discharged into the rear main conveyor through the feeder, and the first-stage conveyor can operate independently or simultaneously;
the cooling air for cooling the pebble coal can be discharged into a flue at the tail part of the boiler through an air duct, or can be discharged to the atmosphere through a filter at the top of a pebble coal bin through a cooling air pipeline, or is connected to the head part of a dry slag extractor through an air duct to enter a dry slag extraction system, so that the heat contained in the pebble coal is brought into the dry slag extraction system through the cooling air, and then is recovered again through a waste heat recovery device of the dry slag extraction system and is sent into the boiler, and the heat loss is reduced;
the second-stage conveyor or the main conveyor can be provided with an automatic pebble coal flattening device, so that pebble coal is uniformly distributed on the width of the whole conveyor in the conveying process, heat exchange between cooling air and the pebble coal is facilitated, and meanwhile, the pebble coal is uniformly discharged into downstream equipment;
additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a closed pebble coal processing system according to an embodiment of the invention;
FIG. 2 is a schematic view of another closed pebble coal processing system according to an embodiment of the invention;
FIG. 3 is a schematic view of another closed pebble coal processing system according to an embodiment of the invention;
FIG. 4 is a schematic view of a main conveyor according to an embodiment of the present invention;
FIG. 5 is a schematic view of another embodiment of a main conveyor according to the present invention.
In the figure:
1. a boiler; 2. a slag extractor; 3. a slag crusher; 5. a coal mill; 6. a manual gate valve; 7. a first pneumatic gate valve; 8. a pebble coal storage tank; 9. a second pneumatic gate valve; 10. a first stage conveyor; 11. a level gauge; 12. a main conveyor; 13. an adjustable air inlet door; 14. a secondary conveyor; 15. an automatic flattening device; 20. a feeder; 21. an isolation valve; 22. a bucket elevator; 23. a filter; 24. an induced draft fan; 25. a pebble coal bunker; 26. a discharge device; 27. an upper cover plate; 28. a material guide plate; 29. a sealing device; 30. carrying support rollers; 31. conveying a steel belt; 32. a guard plate; 33. a rotary carrier roller; 34. a main body.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
An embodiment of the present invention provides a closed pebble coal processing system, as shown in fig. 1, including: the device comprises a pebble coal storage tank 8, a manual gate valve 6, a first pneumatic gate valve 7, a second pneumatic gate valve 9, a charge level indicator 11, a feeder 20, a primary conveyor 10, a main conveyor 12 and a tail end conveyor;
the manual gate valve 6 is arranged at the inlet of the pebble coal storage tank 8, and the first pneumatic gate valve 7 is arranged at the inlet of the pebble coal storage tank 8 and is positioned below the manual gate valve 6; the pebble coal enters a pebble coal storage tank 8 after passing through a manual gate valve 6 and a first pneumatic gate valve 7;
the second pneumatic gate valve 9 is arranged at the outlet of the pebble coal storage tank 8 and is communicated with the feeder 20;
the feeder 20 is communicated with the feeding end of the first-stage conveyor 10;
the discharge end of the first-stage conveyor 10 is communicated with the feed end of the main conveyor 12;
the discharge end of the main conveyor 12 is communicated with the end conveyor; a cooling part is arranged in the main conveyor 12 and cools the pebble coal;
the level indicator 11 is arranged in the pebble coal storage tank 8 and is used for detecting the level of the material in the pebble coal storage tank 8; when a preset material level in the pebble coal storage tank 8 is detected, the first pneumatic gate valve 7 is automatically closed, then the main conveyor 12, the first-stage conveyor 10 and the feeder 20 are sequentially started to operate, then the second pneumatic gate valve 9 at the outlet of the pebble coal storage tank 8 is automatically opened, pebble coal is discharged to the first-stage conveyor 10 through the feeder 20, the pebble coal discharged from the first-stage conveyor 10 falls into the main conveyor 12, and finally is discharged to the tail end conveyor from the main conveyor 12; the end conveyor conveys the pebble coal to a slag extractor 2 of the dry slag discharging system.
The working principle and the beneficial effects of the technical scheme are as follows:
in the operation process of the coal mill 5, discharged stone coal or metal and other foreign matters enter the stone coal storage tank 8 through the manual gate valve 6 at the inlet of the stone coal storage tank 8 and the first pneumatic gate valve 7 at the inlet of the stone coal storage tank 8, when the quantity of the stone coal in the stone coal storage tank 8 reaches a high level and triggers the level indicator 11 in the stone coal storage tank 8, the first pneumatic gate valve 7 is automatically closed, then the main conveyor 12, the first-level conveyor 10 and the feeder 20 are sequentially started to operate, then the second pneumatic gate valve 9 at the outlet of the stone coal storage tank 8 is automatically opened, the stone coal is discharged to the first-level conveyor 10 through the feeder 20, the stone coal discharged from the first-level conveyor 10 falls into the main conveyor 12, and finally the stone coal is discharged into the tail-end conveyor from the main conveyor 12.
When the coal pulverizer is a plurality of, the pebble coal storage tank 8, the manual gate valve 6, the first pneumatic gate valve 7, the second pneumatic gate valve 9, the charge level indicator 11, the feeder 20 and the first-stage conveyor 10 are all arranged according to the number of the coal pulverizer, and one coal pulverizer is guaranteed to be provided with a group of devices to discharge pebble coal. In this case, the main conveyor 12 has a plurality of feeding ends, and the discharge ends of the plurality of first-stage conveyors 10 are communicated to the feeding ends in a one-to-one correspondence.
The level indicator 11 can adopt an infrared grating, namely, the infrared grating is arranged on two side walls inside the pebble coal storage tank 8, and the level can be detected by obtaining the infrared grating according to the blockage of the pebble coal.
All the components of the system adopt safe closed conditions, and the whole system is in a micro-negative pressure state by adopting negative pressure equipment.
The closed pebble coal processing system is connected to the pebble coal outlet of the coal mill, so that the coal mill can discharge pebble coal timely, safely, economically, stably and environmentally.
In one embodiment, as shown in fig. 1, 2 and 3, the cooling member includes: an adjustable air inlet door 13 is arranged at the discharge end of the main conveyor 12, an air pipe is arranged at the feed end of the main conveyor 12, and an isolation valve 21 is arranged on the air pipe. The air pipe is communicated with a flue at the tail part of the boiler through the isolating valve 21, or communicated with a dry slag discharge system, or communicated with a top filter 23 of a pebble coal bunker 25.
The working principle and the beneficial effects of the technical scheme are as follows:
cooling air enters from the adjustable air inlet door 13, exchanges heat with pebble coal in the main conveyor 12 to bring heat out of the pebble coal, and is discharged into a flue at the tail part of the boiler 1 through an air pipe, or is discharged to the atmosphere through a filter 23 at the top of a pebble coal bin 25 through the air pipe, or is connected to the head part of the dry slag extractor 2 through the air pipe to enter a dry slag removal system. When the system is shut down, the isolation valve 21 closes.
In one embodiment, as depicted in fig. 1, the end conveyor comprises: a secondary conveyor 14; the feed end of the secondary conveyor 14 is in communication with the main conveyor 12; the discharge end of the secondary conveyor 14 is communicated with a slag extractor 2 of the dry slag discharging system.
The working principle and the beneficial effects of the technical scheme are as follows:
pebble coal is discharged into a secondary conveyor 14, the secondary conveyor 14 conveys and discharges the pebble coal into a slag extractor 2 of a dry slag discharging system, and the pebble coal is crushed by a slag crusher 3 and then conveyed to a slag bin together with bottom slag of a boiler 1 for comprehensive treatment and utilization.
In this embodiment, the pebble coal bunker 25 is not separately designed, so that the floor area of the power plant is greatly saved, and all pebble coal is directly conveyed to the dry slag discharging system to be comprehensively treated and utilized together with the bottom slag of the boiler 1.
In one embodiment, as shown in fig. 2, the closed pebble coal processing system further comprises: a pebble coal bunker 25; the end conveyor includes: a bucket elevator 22; the bucket elevator 22 is disposed at the discharge end of the main conveyor 12, and is used for conveying the pebble coal conveyed by the main conveyor 12 to a pebble coal bunker 25.
The working principle and the beneficial effects of the technical scheme are as follows:
pebble coal is discharged into a downstream bucket elevator 22 from the main conveyor 12, the pebble coal is conveyed and discharged to a pebble coal bin 25 by the bucket elevator 22, the pebble coal is temporarily stored in the pebble coal bin 25, and is discharged to an open truck for outward transportation through a pebble coal discharging device 26 at the bottom of the pebble coal bin 25 after a certain time.
In one embodiment, as shown in fig. 3, the closed pebble coal processing system further comprises: a pebble coal bunker 25; the feed end of the pebble coal bunker 25 is communicated with the discharge end of the main conveyor 12.
The working principle and the beneficial effects of the technical scheme are as follows:
pebble coal is discharged into a downstream pebble coal bunker 25 from the main conveyor 12, temporarily stored in the pebble coal bunker 25 and discharged to an open truck for outward transportation through a pebble coal discharging device 26 at the bottom of the pebble coal bunker 25 after a certain time.
In one embodiment, an automatic flattening device 15 is further disposed in the main conveyor 12 for flattening the pebble coal in the main conveyor 12.
The working principle and the beneficial effects of the technical scheme are as follows:
the automatic spreading device 15 can adopt a principle similar to that of a wiper of an automobile and adopts a swing arm to spread the pebble coal in the main conveyor 12. Further, an automatic leveling device 15 is also provided in the primary conveyor 10 and the secondary conveyor 14.
In one embodiment, the primary conveyor 10, the secondary conveyor 14 comprise: a steel belt conveyor or a chain plate conveyor or a screw conveyor;
the main conveyor 12 includes: a steel belt conveyor or a chain plate conveyor.
The mechanical conveying mode is more stable than a pneumatic conveying mode, and the problems of pipe blockage of a pebble coal conveying pipeline, serious abrasion of a pebble coal pipeline and an elbow, environmental pollution caused by leakage of pebble coal and pulverized coal and the like are solved.
In one embodiment, as shown in FIG. 4, the main conveyor 12 comprises: the device comprises a main body 34, a carrying idler 30, a revolving idler 33, a guard plate 32, two sealing devices 29, a conveying steel belt 31 and an upper cover plate 27;
the carrying idler 30 and the revolving idler 33 are respectively fixedly connected with the main body 34; the carrying idler 30 is positioned above the revolving idler 33, the conveying steel belt 31 is in a closed ring shape, one part of the conveying steel belt is positioned on the carrying idler 30, and the other part of the conveying steel belt is positioned on the revolving idler 33; the left end and the right end of the conveying steel belt 31 are respectively provided with a baffle plate, and the baffle plates are fixedly connected with the conveying steel belt 31; the guard plate 32 is located between the load bearing idler 30 and the turning idler 33; the upper cover plate 27 is arranged at the upper opening of the main body 34; the two sealing devices 29 are symmetrically arranged steel wire brushes, are positioned on two sides of the conveying steel belt 31 above the carrying supporting roller 30, and are positioned between the two baffles.
Two symmetrically arranged material guiding plates 28, one end of each material guiding plate is fixedly arranged with the main body 34, and the other end is positioned at the inner side of the baffle; the sealing device 29 is fixedly connected with one end of the material guide plate 28 far away from the main body 34.
The working principle and the beneficial effects of the technical scheme are as follows:
the carrier roller 30 and the revolving carrier roller 33 rotate to drive the conveying steel belt 31 to rotate. Pebble coal is conveyed by the conveying steel belt 31 on the bearing carrier roller 30, and the guard plate 32 prevents fine powder from remaining on the inner side of the conveying steel belt 31, so that the stability of the operation of the conveying steel belt 31 on the bearing carrier roller 30 and the rotary carrier roller 33 is ensured. The sealing device 29 ensures that the pebble coal does not fall to the lower part when being transported on the steel transporting belt 31. Furthermore, the middle part of the material guide plate is provided with a slope.
Main conveyor structure 12 in another embodiment, as shown in fig. 5, the main conveyor 12 comprises: the device comprises a main body 34, a carrying idler 30, a revolving idler 33, a guard plate 32, two sealing devices 29, a conveying steel belt 31 and an upper cover plate 27;
the carrying idler 30 and the revolving idler 33 are respectively fixedly connected with the main body 34; the carrying idler 30 is positioned above the revolving idler 33, the conveying steel belt 31 is in a closed ring shape, one part of the conveying steel belt is positioned on the carrying idler 30, and the other part of the conveying steel belt is positioned on the revolving idler 33; the left end and the right end of the conveying steel belt 31 are respectively provided with a baffle plate, and the baffle plates are fixedly connected with the conveying steel belt 31; the guard plate 32 is located between the load bearing idler 30 and the turning idler 33; the upper cover plate 27 is arranged at the upper opening of the main body 34; the two sealing devices 29 are symmetrically arranged steel wire brushes, are positioned on two sides of the conveying steel belt 31 above the carrying supporting roller 30, and are positioned between the two baffles.
The sealing device 29 is fixedly connected with the bottom end of the upper cover plate 27 through a fixing body.
The closed pebble coal processing system also has the following beneficial effects:
the system always operates under the conditions of micro negative pressure and safe sealing, the adjustable air inlet door 13 is designed to be in a non-return type, when micro positive pressure occurs in the system under an abnormal working condition, the adjustable air inlet door 13 is automatically closed, no coal powder is emitted into ambient air, the operating environment is clean, and the problem of environmental pollution is avoided;
the first-stage conveyor 10, the second-stage conveyor 14 and the main conveyor 12 all adopt a mechanical conveying mode, the mechanical conveying mode is more stable than a pneumatic conveying mode, and the problems of pipe blockage of a pebble coal conveying pipeline, serious abrasion of a pebble coal pipeline and an elbow, environmental pollution caused by leakage of pebble coal and coal dust and the like are solved;
the pebble coal is conveyed by adopting a dry cooling and mechanical mode, and high-energy-consumption equipment such as a Roots blower or an air compressor and the like is not required to be installed, so that the power consumption of the whole system is low, and the operation and maintenance cost is low;
and fourthly, the automatic flattening device 15 is designed and installed on the secondary conveyor 14 or the main conveyor 12, so that the pebble coal is uniformly distributed on the width of the whole conveyor in the conveying process, heat exchange between cooling air and the pebble coal is facilitated, meanwhile, the pebble coal is uniformly discharged into downstream equipment, and the problem of blockage of the equipment below is avoided.
Introducing cooling air, wherein an additional induced draft fan is not needed to be installed, an existing negative pressure source in a power plant area is utilized, the cooling air after the pebble coal is cooled is discharged into a flue at the tail part of the boiler 1 through an air pipe, and can also be discharged to the atmosphere through a filter 23 at the top of a pebble coal bin 25 and an induced draft fan 24, or the cooling air is connected to the head part of a dry slag extractor 2 to enter a dry slag removal system, and heat contained in the pebble coal is recovered again and is sent into the boiler 1, so that the heat loss is reduced;
the system can directly convey the pebble coal into the dry slag discharging system, the pebble coal system does not need to independently design the pebble coal bin 25, the design of the whole system is simplified, the overall investment is reduced, the pebble coal and the boiler dry slag are comprehensively utilized, and the utilization value of the pebble coal is improved;
it will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A closed pebble coal processing system, comprising: the device comprises a pebble coal storage tank (8), a manual gate valve (6), a first pneumatic gate valve (7), a second pneumatic gate valve (9), a level indicator (11), a feeder (20), a primary conveyor (10), a main conveyor (12) and a tail end conveyor;
the manual gate valve (6) is arranged at the inlet of the pebble coal storage tank (8), and the first pneumatic gate valve (7) is arranged at the inlet of the pebble coal storage tank (8) and is positioned below the manual gate valve (6); pebble coal passes through the manual gate valve (6) and the first pneumatic gate valve (7) and then enters the pebble coal storage tank (8);
the second pneumatic gate valve (9) is arranged at the outlet of the pebble coal storage tank (8) and is communicated with the feeder (20);
the feeder (20) is communicated with the feeding end of the primary conveyor (10);
the discharge end of the first-stage conveyor (10) is communicated with the feed end of the main conveyor (12);
the discharge end of the main conveyor (12) is communicated with the tail end conveyor; a cooling component is arranged in the main conveyor (12), and the cooling component cools the pebble coal;
the level indicator (11) is arranged in the pebble coal storage tank (8) and is used for detecting the level of the material in the pebble coal storage tank (8); when a preset material level in the pebble coal storage tank (8) is detected, the first pneumatic gate valve (7) is automatically closed, then the main conveyor (12), the primary conveyor (10) and the feeder (20) are sequentially started to operate, then the second pneumatic gate valve (9) at the outlet of the pebble coal storage tank (8) is automatically opened, the pebble coal is discharged to the primary conveyor (10) through the feeder (20), the pebble coal discharged from the primary conveyor (10) falls into the main conveyor (12), and finally is discharged to the tail end conveyor from the main conveyor (12); and the tail end conveyor conveys the pebble coal to a slag extractor (2) or a pebble coal bin (25) of a dry slag discharging system.
2. The closed pebble coal processing system of claim 1, wherein the cooling component comprises: an adjustable air inlet door (13) is arranged at the discharge end of the main conveyor (12), an air pipe is arranged at the feed end of the main conveyor (12), and an isolation valve (21) is arranged on the air pipe.
3. The closed pebble coal processing system of claim 1, wherein the end conveyor comprises: a secondary conveyor (14); the feeding end of the secondary conveyor (14) is communicated with the main conveyor (12); the discharge end of the secondary conveyor (14) is communicated with a slag extractor (2) of the dry slag discharging system.
4. The closed pebble coal processing system of claim 1 further comprising: a pebble coal bunker (25); the end conveyor includes: a bucket elevator (22); the bucket elevator (22) is arranged at the discharge end of the main conveyor (12) and is used for conveying pebble coal conveyed by the main conveyor (12) to a pebble coal bin (25).
5. The closed pebble coal processing system of claim 1 further comprising: a pebble coal bunker (25); the feed end of the pebble coal bin (25) is communicated with the discharge end of the main conveyor (12).
6. A closed pebble coal processing system according to claim 1, wherein an automatic flattening device (15) is further arranged in the main conveyor (12) for flattening the pebble coal in the main conveyor (12).
7. A closed pebble coal processing system according to claim 1 or 3,
the primary conveyor (10), the secondary conveyor (14) comprising: a steel belt conveyor or a chain plate conveyor or a screw conveyor;
the main conveyor (12) comprises: a steel belt conveyor or a chain plate conveyor.
8. A closed pebble coal processing system according to claim 2,
and the air pipe is communicated with a flue at the tail part of the boiler through the isolating valve (21), or communicated with a dry slag discharge system, or communicated with a top filter (23) of the pebble coal bunker (25).
9. A closed pebble coal processing system according to claim 1,
the main conveyor (12) comprises: the device comprises a main body (34), a carrying idler (30), a rotary idler (33), a guard plate (32), a sealing device (29), a conveying steel belt (31) and an upper cover plate (27);
the carrying carrier roller (30) and the rotary carrier roller (33) are respectively and fixedly connected with the main body (34); the carrying idler (30) is positioned above the rotary idler (33), the conveying steel belt (31) is in a closed ring shape, one part of the conveying steel belt is positioned on the carrying idler (30), and the other part of the conveying steel belt is positioned on the rotary idler (33); the left end and the right end of the conveying steel belt (31) are respectively provided with a baffle plate, and the baffle plates are fixedly connected with the conveying steel belt (31); the guard plate (32) is located between the carrying idler (30) and the turning idler (33); the upper cover plate (27) is arranged at an opening above the main body (34); the two sealing devices (29) are symmetrically arranged steel wire brushes and are positioned on two sides of the conveying steel belt (31) above the carrying carrier roller (30) and between the two baffles.
10. A closed pebble coal processing system according to claim 9,
the sealing device (29) is fixedly connected with the bottom end of the upper cover plate (27) through a fixing body;
or the like, or, alternatively,
the conveyor (12) further comprises: one end of each material guide plate (28) is fixedly arranged with the main body (34), and the other end of each material guide plate (28) is positioned on the inner side of the baffle; the sealing device (29) is fixedly connected with one end of the material guide plate (28) far away from the main body (34).
CN202010141087.XA 2020-03-04 2020-03-04 Closed processing system of stone coal Pending CN111229439A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010141087.XA CN111229439A (en) 2020-03-04 2020-03-04 Closed processing system of stone coal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010141087.XA CN111229439A (en) 2020-03-04 2020-03-04 Closed processing system of stone coal

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010141087.XA Pending CN111229439A (en) 2020-03-04 2020-03-04 Closed processing system of stone coal

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Country Link
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113526165A (en) * 2021-07-15 2021-10-22 神华北电胜利能源有限公司 Coal pulverizer discharge system
CN113713948A (en) * 2021-08-30 2021-11-30 北京干雾科技有限公司 Stone coal recycling device and method
CN113953073A (en) * 2021-09-22 2022-01-21 国能龙源环保有限公司 Large-scale coal fired boiler coupling is useless storage transportation feeding system useless admittedly

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113526165A (en) * 2021-07-15 2021-10-22 神华北电胜利能源有限公司 Coal pulverizer discharge system
CN113713948A (en) * 2021-08-30 2021-11-30 北京干雾科技有限公司 Stone coal recycling device and method
CN113953073A (en) * 2021-09-22 2022-01-21 国能龙源环保有限公司 Large-scale coal fired boiler coupling is useless storage transportation feeding system useless admittedly

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