CN204841988U - System is selected separately to particulate coal dry process - Google Patents

Abstract

The utility model discloses a fine-grained coal dry separation system, which comprises a screw feeder, a feeding bin is arranged above the screw feeder, and an air swirl separator and an air swirl separator are connected to the outlet end of the screw feeder. The primary air blower, and the outlet end of the primary air blower is connected with the primary jet hole of the air cyclone separator, the bottom outlet end of the air cyclone separator is connected to the tailing coal storage bin, and the top outlet end is connected to the Clean coal separation device for clean coal. The utility model has low sorting lower limit, high precision and simple process, and is especially suitable for coal sorting and quality improvement in water-deficient areas.

Description

A dry separation system for fine coal

technical field

The utility model relates to the field of coal sorting, in particular to a fine-grained coal dry sorting system, which is suitable for sorting and improving the quality of coal in water-deficient areas.

Background technique

my country's coal reserves are abundant, but the distribution is uneven. Most of the coal resources are stored in the arid and water-scarce western regions. The selection rate of coal in our country is low, and the selection ratio of steam coal is even lower, which has caused serious resource waste and environmental pollution problems. China's coal resources are mainly distributed in arid and water-scarce areas, accounting for 2/3 of the country's coal reserves; a considerable number of young coal types in China are prone to mud when exposed to water, and wet separation is not suitable. Moreover, the use of wet jigging, dense medium and flotation coal preparation consumes a lot of water, the pressure of the coal slime water system is high, and the external water of wet separation products is as high as 12%, and the investment and production costs are high, which limits the development of some local coal mining enterprises. develop. With the rapid development of science and technology and the increasingly prominent advanced nature of modern production, realizing energy saving, effective use of resources and strengthening environmental protection has become an increasingly urgent global requirement. There are more and more fine-grained coals being selected and classified, and the content of 3-0.5mm is generally between 20% and 45%. Therefore, dry separation of fine-grained coal is very necessary. At present, dry coal preparation mainly uses the difference in physical properties between coal and gangue for separation, such as density, particle size, shape, gloss, magnetic permeability, electrical conductivity, radiation, friction coefficient, etc. 50-6mm particle size coal dry separation technology is relatively mature, mainly including air jigging, compound dry separation technology and air heavy medium fluidized bed separation technology, etc., but the dry separation of fine coal , is still in the stage of experimental research, and no relevant information on industrialization has been found.

Utility model content

The purpose of this utility model is to provide a kind of fine-grained coal dry separation system to overcome the defects of the above-mentioned prior art. The utility model has a low separation limit, high precision, and simple process, and is especially suitable for water-deficient areas. Coal sorting and upgrading.

In order to achieve the above object, the utility model adopts the following technical solutions:

A dry separation system for fine-grained coal, comprising a screw feeder, a feeding bin is arranged above the screw feeder, an air cyclone separator and a primary air blower are connected to the outlet end of the screw feeder, and The outlet end of the primary air blower is connected to the primary jet hole of the air cyclone separator, the bottom outlet end of the air cyclone separator is connected to the tailing coal storage bin, and the top outlet end is connected to the clean coal used for sorting clean coal Sorting device.

Further, the air cyclone separator is provided with several secondary jet holes, and the secondary jet holes are all connected to the secondary air blower.

Further, both the primary jet hole and the secondary jet hole are tangential inlets.

Further, flow meters are provided at the outlet ends of the primary air blower and the secondary air blower.

Further, pressure gauges are provided at the inlets of the primary jet hole and the secondary jet hole of the air cyclone separator.

Further, the clean coal separation device includes a cyclone dedusting device and a bag dedusting device, the top outlet end of the air cyclone separator is connected to the inlet end of the cyclone dedusting device, and the top outlet end of the cyclone dedusting device is connected to the inlet end of the bag dedusting device , the top outlet of the bag dust removal device is connected to the atmosphere, and the bottom outlets of the cyclone dust removal device and the bag dust removal device are connected to a clean coal storage bin.

Further, the cyclone dust removal device includes several cyclone dust collectors connected in series, and the bag dust removal device includes several bag dust collectors connected in series.

Further, the clean coal separation device includes a cyclone dust collector and a bag filter, the top outlet end of the air cyclone separator is connected to the inlet end of the cyclone dust collector, and the top outlet end of the cyclone dust collector is connected to the bag filter. The inlet port and the top outlet port of the bag filter are connected to the atmosphere, and the bottom outlet ports of the cyclone dust collector and the bag filter are respectively connected to the first clean coal storage bin and the second clean coal storage bin.

Compared with the prior art, the utility model has the following beneficial technical effects:

When the utility model is working, the primary air blower is first turned on, and then the screw feeder is turned on, and the material enters the air cyclone separator tangentially at a certain initial speed under the action of the wind force. Under the action of the swirling flow, the heavy products and large particles move down along the wall after sticking to the wall, and are discharged from the underflow; the light products form an internal swirling flow in the center, and move upward and are discharged from the overflow. The underflow of the air cyclone separator The product is collected into the tailing coal storage bin, and the overflow product enters the clean coal separation device to separate the clean coal. This system has a compact structure and does not require a water source. It is especially suitable for the western region with abundant coal reserves and water shortage. The process is simple and economical. Environmental friendly. At the same time, the lower limit of sorting particle size is low, and the application range is wide.

Furthermore, the utility model also includes a secondary air blower, the secondary air can blow the large particle light products attached to the wall to the inner swirling flow, so as to improve the yield of clean coal and the separation accuracy.

Furthermore, both the primary jet hole and the secondary jet hole are in tangential direction, which can provide a larger centrifugal force and is beneficial to sorting.

Furthermore, the outlets of the primary air blower and the secondary air blower are both provided with flow meters, which can accurately control the air flow.

Furthermore, the inlets of the primary jet hole and the secondary jet hole of the air cyclone separator are equipped with pressure gauges, which can accurately control the air pressure fed in, and improve the clean coal yield and separation accuracy.

Further, the underflow product of the air cyclone separator is collected into the tailing coal storage bin, the overflow product is introduced into the cyclone dust collector, the underflow of the cyclone dust collector enters the first clean coal storage bin, and the overflow is introduced into the bag filter, The coal powder collected by the bag filter is collected into the second clean coal storage bin, and the clean air is discharged into the atmosphere. The cyclone dust collector can separate the clean coal overflowed from the air cyclone separator from the air. The bag filter can The air-coal mixture overflowed by the cyclone dust collector is further separated, and the clean air is discharged into the atmosphere.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the utility model.

Among them, 1. Air cyclone separator; 2. Pressure gauge; 3. Cyclone dust collector; 4. Bag filter; 5. Feeding bin; 6. Screw feeder; 7. Flow meter; 8. Primary air Blower; 9. Secondary air blower; 10. Tail coal storage bin; 11. First clean coal storage bin; 12. Second clean coal storage bin.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail:

See Figure 1, a fine-grained coal dry separation system, which is suitable for the separation and upgrading of coal in water-scarce areas. This system includes vibrating screw feeder, primary air blower 8, secondary air blower 9, flow meter 7, pressure gauge 2, compound air cyclone separator, cyclone dust collector 3, bag filter 4, clean coal and Coal tailings storage bin, etc. A feeding bin 5 is set above the screw feeder 6. The feeding speed of the screw feeder 6 can be adjusted by a frequency converter to control the feeding concentration. The material is fed into the compound air cyclone separator through the primary air blower 8. At the same time of sorting, turn on the secondary air blower 9, and feed the secondary air from the lower half of the cylindrical section of the composite air cyclone separator. The composite air cyclone separator is equipped with two fans with frequency conversion. The air is supplied twice to ensure the separation accuracy. The overflow of the composite air cyclone separator is connected to the cyclone dust collector 3, the bottom flow is connected to the tailing coal storage bin 10, the overflow of the cyclone dust collector 3 is connected to the bag filter 4, and the bottom flow is connected to the first The clean coal storage bin 11 and the cyclone dust collector 3 are used to separate the clean coal overflowed from the composite air cyclone separator from the air, the overflow of the bag filter 4 is connected to the atmosphere, and the collected coal powder is recycled to the second The clean coal storage bin 12 and the bag dust collector 4 are used to further separate the air-coal mixture overflowed from the cyclone dust collector 3, so that the clean air is discharged into the atmosphere.

The operation process of the present utility model is further described below:

When the utility model is used for sorting, the primary air blower 8 is first opened, and then the screw feeder 6 is opened, and the material enters the air cyclone sorter 1 tangentially at a certain initial speed under the action of the wind force. Under the action of swirling flow, heavy products and large particles move downward along the wall after sticking to the wall, and are discharged from the bottom flow; light products form an internal swirling flow in the center, and move upward and are discharged from the overflow; at the same time, open the secondary air The blower 9, the secondary air is fed by the secondary jet hole of the air cyclone separator 1, the secondary air is mainly to blow the large particles and light products attached to the wall to the inner swirl, so as to improve the yield of clean coal and the separation accuracy . The underflow product of the air cyclone separator 1 is collected into the tailing coal storage bin 10, the overflow product is introduced into the cyclone dust collector 3, the underflow product of the cyclone dust collector 3 enters the first clean coal storage bin 11, and the overflow is introduced into the bag dust collector The device 4 collects the pulverized coal collected by the bag filter 4 into the second clean coal storage bin 12, and the clean air is discharged into the atmosphere.

Claims (8)

1. a kind of fine-grained coal dry separation system is characterized in that, comprises screw feeder (6), and the top of screw feeder (6) is provided with feeding bin (5), and screw feeder (6) ) is connected with the air cyclone separator (1) and the primary air blower (8), and the outlet end of the primary air blower (8) is connected with the primary jet hole of the air cyclone separator (1), and the air The bottom outlet of the swirl separator (1) is connected with a tailing coal storage bin (10), and the top outlet is connected with a clean coal sorting device for sorting clean coal. 2. A kind of fine-grained coal dry separation system according to claim 1, characterized in that, the air cyclone separator (1) is provided with some secondary jet holes, and the secondary jet holes are all connected to the secondary air blower (9). 3. A fine-grained coal dry separation system according to claim 2, characterized in that, both the primary jet hole and the secondary jet hole are tangential inlets. 4. A fine-grained coal dry separation system according to claim 2, characterized in that flow meters (7) are provided at the outlets of the primary air blower (8) and the secondary air blower (9). 5. A kind of fine-grained coal dry method sorting system according to claim 2, it is characterized in that, the inlet end of the primary jet hole and the secondary jet hole of the air cyclone separator (1) is provided with a pressure gauge (2). 6. A kind of fine-grained coal dry method sorting system according to claim 1, it is characterized in that, clean coal sorting device comprises cyclone dedusting device and bag dedusting device, the top outlet of air cyclone sorting machine (1) The end is connected with the inlet port of the cyclone dust collector, the top outlet port of the cyclone dust collector is connected with the inlet port of the bag filter device, the top outlet port of the bag filter device is connected with the atmosphere, and the bottom outlet ports of the cyclone dust collector and the bag filter device are connected with Clean coal storage silo. 7. A kind of fine-grained coal dry method sorting system according to claim 6, is characterized in that, cyclone dedusting device comprises some cyclone dust catchers (3) connected in series, and bag dust removal device comprises some bag dust catchers (4) connected in series ). 8. A kind of fine-grained coal dry separation system according to claim 1, characterized in that, the clean coal separation device comprises a cyclone dust collector (3) and a bag filter (4), and the air cyclone separation The top outlet of the separator (1) is connected to the inlet of the cyclone dust collector (3), the top outlet of the cyclone dust collector (3) is connected to the inlet of the bag filter (4), and the top of the bag filter (4) The outlet port is connected to the atmosphere, and the bottom outlet ports of the cyclone dust collector (3) and the bag filter (4) are respectively connected with a first clean coal storage bin (11) and a second clean coal storage bin (12).