阅读说明：本技术 真重液无煤泥选煤技术及设备 (Coal separation technology and equipment using true heavy liquid without coal slime ) 是由 王雪松 王诗扬 于 2019-10-30 设计创作，主要内容包括：本发明公开了一种真重液无煤泥选煤技术及设备,涉及重介质选煤技术领域。包括充介：将介质注入到设有气囊的密闭腔体内,调节腔体内真空度使气囊处于压缩状态,将抽取的空气与介质蒸汽通过冷凝、膜分离、回收；分选：将原煤注入腔体内,原煤在介质中分层,形成精煤、中煤以及矸石层,用分层装置将各层产品分类存放,此时气囊充盈；脱介：将液态介质过滤、回收,调节真空度,使残留介质蒸发,并向腔体内充入大气或热风,通过冷凝和膜分离进行回收；排料：将得到的产品通过排料设备分类收取,解决了现有干法选煤技术分选精度差,湿法选煤工艺复杂、洗选成本高、产品水分高及其产生的煤泥对环境的污染以及不能满足下游产业的使用需求的问题。(The invention discloses a true heavy liquid coal slime-free coal separation technology and equipment, and relates to the technical field of heavy medium coal separation. Comprises the following steps: injecting a medium into a closed cavity provided with an air bag, adjusting the vacuum degree in the cavity to enable the air bag to be in a compressed state, and condensing, separating and recovering the extracted air and medium steam; sorting: injecting raw coal into the cavity, layering the raw coal in the medium to form a clean coal layer, a middlings layer and a gangue layer, and storing products of each layer in a classified manner by using a layering device, wherein the air bags are full; medium removal: filtering and recovering the liquid medium, adjusting the vacuum degree to evaporate the residual medium, filling atmospheric air or hot air into the cavity, and recovering the residual medium through condensation and membrane separation; discharging: the obtained products are classified and collected by discharging equipment, and the problems of poor separation precision, complex wet coal separation process, high washing cost, high product moisture, environmental pollution caused by generated coal slime and incapability of meeting the use requirements of downstream industries in the conventional dry coal separation technology are solved.)

1. A true-heavy-liquid coal-slurry-free coal separation technology is characterized by comprising the following steps:

filling medium: injecting a liquid medium into a closed cavity connected with an elastic air bag (112), adjusting the vacuum degree in the closed cavity to enable the elastic air bag (112) to be in a compressed state, and simultaneously condensing, separating a membrane and recovering the extracted air and the steam of the medium;

sorting: putting raw coal containing coal and gangue into the closed cavity, layering the raw coal in the medium to form a clean coal layer, a medium coal layer and a gangue layer, and storing products of each layer in a classified manner through a layering device, wherein the elastic air bag (112) is full;

medium removal: filtering and recovering the liquid medium, then adjusting the vacuum degree in the closed cavity to quickly evaporate and pump away the residual medium, and then filling atmosphere or hot air into the closed cavity to completely remove the medium of the three products in the sorting chamber; the pumped steam medium is recycled by a condensation and membrane separation integrated method;

discharging: the obtained products are classified and collected by a discharging device (10).

2. The true heavy liquid coal slime-free coal separation technology according to claim 1, wherein the medium is trifluorodichloroethane or trifluorotrichloroethane.

3. The real-weight liquid coal-slurry-free coal separation technology according to claim 1, wherein the number of the elastic air bags (112) is not limited, but the total volume is not less than the volume of the raw coal fed once or the volume of the liquid medium charged once.

4. An apparatus for implementing the true weight liquid coal separation technology according to any one of claims 1 to 3, comprising:

a bunker (1) for storing the raw coal;

the separation chamber is arranged below the stock bin (1) and used for separating raw coal, the separation chamber sequentially comprises a clean coal chamber (5), a middling chamber (7) and a waste rock chamber (9) from top to bottom, and an air locking feeder (2) used for providing the raw coal for the separation chamber and a ball valve (3) used for controlling the connection and disconnection of the separation chamber and the stock bin (1) are arranged between the clean coal chamber (5) and the stock bin (1);

the discharge equipment (10) for discharging various products obtained after separation is arranged below the gangue chamber (9), and the ball valve (3) for controlling the connection and disconnection of the gangue chamber (9) and the discharge equipment (10) is arranged between the discharge equipment (10) and the gangue chamber (9);

gate valves (8) for controlling the on-off of the clean coal chamber (5) and the medium coal chamber (7) and the gangue chamber (9) are arranged between the clean coal chamber (5) and the medium coal chamber (7), and the gate valves (8) are the layering devices;

the separation chamber and the two ball valves (3) arranged above and below the separation chamber jointly form the closed cavity;

the shells at the lower ends of the clean coal chamber (5), the medium coal chamber (7) and the gangue chamber (9) are respectively provided with a channel (17) which are annularly arranged, and each channel (17) comprises a medium filling channel (14), a recovery channel and an air filling channel (15) which is connected with the outside or a hot air pipe and is provided with a fifth stop valve (151);

one end of each of the medium filling channel (14) and the medium recovery channel is connected to a medium tank (16) for supplying the medium;

the tank type air bag (11) is connected with the sorting chamber, the tank type air bag (11) comprises a tank body (111) communicated with the atmosphere and an elastic air bag (112) arranged in the tank body (111), and the elastic air bag (112) is communicated with the upper end of the clean coal chamber (5).

5. The apparatus according to claim 4, characterized in that a first stop valve (141), a charge pump (142), a first non-return valve (143) and a second stop valve (144) are arranged in the charge channel (14) in this order, the first stop valve (141) being connected to the medium tank (16); the recovery channel comprises a first recovery channel (13) and a second recovery channel (12), a second check valve (131), a recovery pump (132) and a third stop valve (133) are sequentially arranged on the first recovery channel (13), and the second check valve (131) is connected with the medium tank (16); and a filter (121), a fourth stop valve (122), a vacuum pump (123), a condenser (124), a magnetic pump (125) and a third check valve (126) are sequentially arranged on the second recovery channel (12), and the third check valve (126) is connected with the medium tank (16).

6. The apparatus according to claim 5, characterized in that one end of the condenser (124) is further provided with a membrane separator (127); the membrane separator (127) is provided with a channel connected between the fourth stop valve (122) and the vacuum pump (123); the membrane separator (127) is provided with a passage connected to the outside atmosphere.

7. The apparatus according to claim 4, characterized in that the charging end (101) of the discharging apparatus (10) is communicated with the gangue chamber (9) through the ball valve (3), the discharging end thereof is provided with a plurality of chutes (104) for discharging different products, and a plurality of electric turning plates for controlling the on-off of each chute (104) are arranged between the charging end (101) and the discharging end.

8. The apparatus according to claim 4, characterized in that the clean coal chamber (5), the medium coal chamber (7) and the gangue chamber (9) are all of a cone-barrel structure and are composed of two layers, the outer layer (51) is the sorting chamber shell, the inner layer (52) is a filter layer with a filter screen, a cavity (53) is arranged between the inner layer (52) and the outer layer (51), and the cavities (53) in the chambers are independent of each other; the interface between the charging channel (14), the recycling channel and the charging channel (15) and the sorting chamber is arranged in the cavity (53).

9. The apparatus according to claim 4, characterized in that the top ends of the middlings chamber (7) and the gangue chamber (9) are respectively provided with an online densitometer (6) for detecting the specific gravity of the middlings layer.

10. The apparatus according to claim 4, characterized in that the top end of the clean coal chamber (5) is provided with a liquid level meter (4) for measuring the liquid level of the medium in the clean coal chamber (5).

Technical Field

The invention relates to the technical field of dense medium coal separation, in particular to a true heavy liquid coal-slime-free coal separation technology and equipment.

Background

China has abundant coal resources, and other provinces except Shanghai are distributed, but the distribution is extremely unbalanced. In the areas between great Xing AnLing-Taihang mountain and Helan mountain in the north of China, the geographical range includes all or most of 6 provinces of inner Mongolia, Shanxi, Shaanxi, Ningxia, Gansu and Henan, the coal resource amount of which is more than 1000 hundred million tons, and the areas are areas where the coal resource amount is intensively distributed in China, and the resource amount accounts for about 50 percent of the national coal resource amount.

In the current coal preparation process, dry method and wet method coal preparation methods are adopted. The current dry separation method has poor separation precision, only plays a role in pre-discharging gangue in most of the time, and is sometimes only used as a previous link for further separation; the mainstream wet coal separation process comprises a jigging method, a heavy medium shallow slot method and a heavy medium rotational flow method, wherein the jigging method is used for layering raw coal by utilizing the combined action of wind and water, and the problem of poor separation precision also exists; the heavy-medium method adopts heavy suspension liquid as a medium, namely two-phase fluid with certain density suspension is prepared by magnetite powder and water, so that raw coal is layered in the medium, and the density is difficult to control because the heavy suspension liquid is simulated. All wet coal separation has the following common disadvantages: 1. the process is complex, the energy consumption is high, the variety of the equipment pipelines is various, the maintenance amount is extremely large, and the operation cost is high. And the washing method is adopted, so that water resources are wasted, a large amount of slime water is generated, a large amount of flotation, concentration, dehydration and drying equipment is required to be put into treatment, and negative effects on the environment are caused. 2. The water content of clean coal and coal slime products is high, and no matter clean coal dewatering equipment or coal slime dewatering equipment is adopted at present, the technology is difficult to break through; the higher moisture content of the product causes higher logistics cost. Coal slime with high water content causes environmental protection problem; and secondly, the method cannot directly meet the increasing requirements of downstream industries such as power plants on water, for example, the dehydrated coal slime needs to be further dried, crushed or blended with clean coal for use.

Therefore, how to solve the technical problems of poor separation precision, complex wet coal separation process, high washing cost, high product moisture, environmental pollution caused by the generated coal slime and incapability of meeting the use requirements of downstream industries in the prior dry coal separation technology becomes an important technical problem to be solved by technical personnel in the field.

Disclosure of Invention

The invention aims to provide a true-heavy liquid coal slime-free coal separation technology and equipment to solve the technical problems of poor separation precision, complex wet coal separation technology, high washing cost, high product moisture, environmental pollution of generated coal slime and incapability of meeting the use requirements of downstream industries in the conventional dry coal separation technology. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.

In order to achieve the purpose, the invention provides the following technical scheme:

the invention provides a true heavy liquid coal slime-free coal dressing technology which comprises the following steps:

filling medium: injecting a liquid medium into a closed cavity connected with an elastic air bag, adjusting the vacuum degree in the closed cavity to enable the elastic air bag to be in a compressed state, and simultaneously condensing, separating a membrane and recovering the extracted air and the steam of the medium;

sorting: putting raw coal containing coal and gangue into the closed cavity, layering the raw coal in the medium to form a clean coal layer, a medium coal layer and a gangue layer, and storing products of each layer in a classified manner through a layering device, wherein the elastic air bags are full;

medium removal: filtering and recovering the liquid medium, then adjusting the vacuum degree in the closed cavity to quickly evaporate and pump away the residual medium, and then filling atmosphere or hot air into the closed cavity to completely remove the medium of the three products in the sorting chamber; the pumped steam medium is recycled by a condensation and membrane separation integrated method;

discharging: and classifying and collecting the obtained products through a discharge device.

On the basis of the technical scheme, the invention can be further improved as follows.

Further, the medium is trifluorodichloroethane or trifluorotrichloroethane.

Furthermore, the number of the elastic air bags is not limited, but the total volume is not less than the volume of the raw coal which is put into the coal once or the volume of the liquid medium which is filled into the coal once.

The invention also provides equipment for implementing the true heavy liquid coal slime-free coal separation technology, which comprises the following steps:

a bin for storing the raw coal;

the separation chamber is arranged below the stock bin and used for separating raw coal, the separation chamber sequentially comprises a clean coal chamber, a middling chamber and a gangue chamber from top to bottom, and an air locking feeder used for providing the raw coal for the separation chamber and a ball valve used for controlling the connection and disconnection of the separation chamber and the stock bin are arranged between the clean coal chamber and the stock bin;

the discharging equipment for discharging various products obtained after separation is arranged below the waste rock chamber, and the ball valve for controlling the connection and disconnection of the waste rock chamber and the discharging equipment is arranged between the discharging equipment and the waste rock chamber;

gate valves for controlling the on-off of the clean coal chamber and the medium coal chamber and between the medium coal chamber and the gangue chamber are arranged between the clean coal chamber and the medium coal chamber, and the gate valves are the layering devices;

the separation chamber and the two ball valves arranged above and below the separation chamber jointly form the closed cavity;

the lower end shells of the clean coal chamber, the medium coal chamber and the waste rock chamber are respectively provided with a channel which is annularly arranged, and the channel comprises a medium filling channel, a recovery channel and an inflation channel which is connected with the outside or a hot air pipe and is provided with a fifth stop valve;

one end of each of the medium filling channel and the medium recovery channel is connected to a medium tank for providing the medium;

the tank type air bag is connected with the separation chamber and comprises a tank body communicated with the atmosphere and an elastic air bag arranged in the tank body, and the elastic air bag is communicated with the upper end of the clean coal chamber.

Furthermore, a first stop valve, a medium charging pump, a first check valve and a second stop valve are sequentially arranged on the medium charging channel, and the first stop valve is connected with the medium tank; the recovery channel comprises a first recovery channel and a second recovery channel, the first recovery channel is sequentially provided with a second check valve, a recovery pump and a third stop valve, and the second check valve is connected with the medium tank; and the second recovery channel is sequentially provided with a filter, a fourth stop valve, a vacuum pump, a condenser, a magnetic pump and a third check valve, and the third check valve is connected with the medium tank.

Furthermore, one end of the condenser is also provided with a membrane separator; the membrane separator is provided with a channel connected between the fourth stop valve and the vacuum pump; the membrane separator is provided with a channel connected with the outside atmosphere.

Further, the pan feeding end of discharge apparatus passes through the ball valve with the waste rock chamber communicates with each other, and its discharge end has a plurality of chutes that are used for discharging different products, the pan feeding end with be equipped with between the discharge end and be used for controlling each a plurality of electronic boards that turn over of chute break-make.

Furthermore, the clean coal chamber, the medium coal chamber and the gangue chamber are all in a cone barrel structure and are composed of double layers, the outer layer is the separation chamber shell, the inner layer is a filter layer with a filter screen, cavities are arranged between the inner layer and the outer layer, and the cavities in the chambers are mutually independent; the medium charging channel, the recycling channel, the air charging channel and the interfaces of the sorting chambers are all arranged in the cavity.

Furthermore, the top ends of the medium coal chamber and the gangue chamber are respectively provided with an online densimeter for detecting the specific gravity of the medium coal layer.

Furthermore, a liquid level meter for measuring the liquid level of the medium in the clean coal chamber is arranged at the top end of the clean coal chamber.

The real-weight liquid coal slime-free coal separation technology in the technical scheme provided by the invention comprises the following steps:

filling medium: injecting a liquid medium into a closed cavity connected with an elastic air bag, adjusting the vacuum degree in the closed cavity to enable the elastic air bag to be in a compressed state, and simultaneously condensing, separating a membrane and recovering the extracted air and the steam of the medium; sorting: putting raw coal containing coal and gangue into a closed cavity, layering the raw coal in a medium to form a clean coal layer, a medium coal layer and a gangue layer, and storing products of each layer in a classified manner through a layering device, wherein an elastic air bag is full; medium removal: filtering and recovering a liquid medium, then adjusting the vacuum degree in the closed cavity to quickly evaporate the residual medium, filling atmospheric air or hot air into the closed cavity, and recovering the medium by a condensation and membrane separation comprehensive method; discharging: and classifying and collecting the obtained products through a discharge device. The coal dressing method is a brand new process, the medium removing process of the method is simple, and the separation precision is higher than that of the heavy medium method which adopts simulated heavy liquid as a medium at present due to the adoption of a true heavy liquid medium; because the coal slime can not be generated, special equipment is not needed for treating the coal slime, so that the process is simplified, the cost is saved, and the technical problems that the existing dry coal separation technology is poor in separation precision, the wet coal separation technology is complex, the washing cost is high, the product moisture is high, the generated coal slime pollutes the environment and the use requirements of downstream industries can not be met are solved.

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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a coal preparation apparatus and a coal preparation process in an embodiment of the present invention;

FIG. 2 is a schematic view of the connection structure of a clean coal chamber, a middling chamber and a gangue chamber in the embodiment of the invention;

FIG. 3 is a schematic structural diagram of a material separating apparatus in an embodiment of the invention;

fig. 4 is a schematic cross-sectional view of a channel connected to a device in an embodiment of the present invention.

In the figure: 1. a storage bin; 2. a gas locking feeder; 3. a ball valve; 4. a liquid level meter; 5. a clean coal chamber; 51. an outer layer; 52. an inner layer; 53. a cavity; 6. an online densitometer; 7. a medium coal chamber; 8. a gate valve; 9. a waste rock chamber; 10. a discharge device; 101. a feeding end; 102. a first electric turning plate; 103. a second electric turning plate; 104. a chute; 11. a canister bladder; 111. a tank body; 112. an elastic air bag; 12. a second recovery channel; 121. a filter; 122. a fourth stop valve; 123. a vacuum pump; 124. a condenser; 125. a magnetic pump; 126. a third check valve; 127. a membrane separator; 13. a first recovery channel; 131. a second check valve; 132. a recovery pump; 133. a third stop valve; 14. a medium filling channel; 141. a first shut-off valve; 142. a medium filling pump; 143. a first check valve; 144. a second stop valve; 15. an inflation channel; 151. a fifth stop valve; 16. a media tank; 17. a channel; 18. a point of intersection; 19. an organic vapor sensor.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

The present invention provides a coal separation technology and equipment using a true heavy liquid without coal slime, and the method does not generate coal slime when used for coal separation, so that no special equipment is needed to treat the coal slime, thereby simplifying the process, saving the cost, avoiding the pollution of a large amount of coal slime with high water content to the environment and the use of downstream manufacturers, and solving the technical problems of poor separation precision, complex wet coal separation process, high washing cost, high product water content, environmental pollution of the generated coal slime and incapability of meeting the use requirements of downstream industries in the existing dry coal separation technology.

Hereinafter, embodiments will be described with reference to the drawings. The embodiments described below do not limit the contents of the invention described in the claims. The entire contents of the configurations shown in the following embodiments are not limited to those required as solutions of the inventions described in the claims.

The invention provides a real-weight liquid coal slime-free coal dressing technology, which comprises a medium filling stage: injecting a medium into the closed cavity, wherein the medium is trifluorodichloroethane or trifluorotrichloroethane, the trifluorodichloroethane is used in three seasons of spring, autumn and winter, and the trifluorotrichloroethane is used in summer, the density of the medium is between that of coal and gangue, the medium has stable chemical property, low boiling point, low specific heat capacity and few residues, is easy to recover, and therefore, coal slime cannot be generated, and the medium can also be a substance with the density between that of the coal and the gangue, low boiling point, easy volatilization, small heat capacity and small viscosity; the closed cavity is also connected with elastic air bags 112, the number of the elastic air bags 112 is not limited, but the total volume of each elastic air bag 112 is not less than any one of the volume of raw coal and the volume of medium which need to be input once, so that the excessive volume of gas can be stored due to occupied space when feeding is carried out in the closed cavity, and negative pressure is not generated when liquid medium is recovered from the separation chamber. The raw coal is a mixture containing coal and gangue, the vacuum degree of the closed cavity is adjusted to enable the elastic air bag 112 to be in a compressed state, and meanwhile, the mixed gas of air and medium steam in the closed cavity is condensed, subjected to membrane separation and recovered.

A separation stage: the raw coal is put into the closed cavity, the coal and the gangue are layered rapidly in the medium due to different densities, so that a clean coal layer, a medium coal layer and a gangue layer are formed, the elastic air bag 112 is full, and then each layer is separated and stored through the layering device.

A medium removal stage: filtering and recovering the liquid medium, at the moment, a small amount of medium is remained on the surfaces of the layered coal products, adjusting the vacuum degree in the closed cavity to evaporate and draw away the remained medium, then filling air or hot air into the cavity to further accelerate evaporation, then condensing and recovering the formed mixed gas, further recovering the medium by membrane separation of residual gas, and discharging the qualified waste gas.

Discharging: the obtained products are classified and collected through the discharge device 10, the products can be clean coal and gangue or clean coal, middlings and gangue, and the washing chamber can be set into a clean coal chamber 5 and a middlings chamber 7 and gangue chamber 9 combination or a clean coal chamber 5 and gangue chamber 9 combination according to needs, so that different products are obtained.

The true heavy liquid coal separation technology is a brand new technology, the medium removal process of the method is simple, and the separation precision is higher than that of the current heavy medium method which adopts simulated heavy liquid as a medium due to the adoption of a true heavy liquid medium; because the coal slime can not be generated, special equipment is not needed for treating the coal slime, so that the process is simplified, the cost is saved, and the technical problems that the existing dry coal separation technology is poor in separation precision, the wet coal separation technology is complex, the washing cost is high, the product moisture is high, the generated coal slime pollutes the environment and the use requirements of downstream industries can not be met are solved.

The invention also provides a device for implementing the above true heavy liquid coal slurry-free coal separation technology, please refer to fig. 1-4, the device provided in this embodiment comprises: the coal mine separation device comprises a bin 1 for storing raw coal, a separation chamber arranged below the bin 1, wherein the separation chamber is a cavity for separating the raw coal, can be three chambers or can be two or more chambers, and can be set according to the requirements of the market on the product types; the ball valve 3 is used for controlling the connection and disconnection between the stock bin 1 and the sorting chamber and simultaneously has a sealing function; gate valves 8 are arranged between the clean coal chamber 5 and the middling chamber 7 and between the middling chamber 7 and the gangue chamber 9, the gate valves 8 are used for controlling the on-off of the chambers and cutting off products on each layer, and the gate valves 8 are the layering devices; a discharging device 10 for discharging various products obtained after separation is arranged below the gangue chamber 9, and a ball valve 3 is also arranged between the discharging device 10 and the gangue chamber 9 and has the same function as the ball valve 3. In this embodiment, all the ball valves 3 are made of flexible ceramic, all the gate valves 8 are made of electric flat gate valves, and the clean coal chamber 5, the middling coal chamber 7, the gangue chamber 9 and each ball valve 3 together form a closed cavity of the medium filling stage.

The feed bin 1, the clean coal chamber 5, the middling chamber 7 and the gangue chamber 9 are all cone barrel structures, the three are sequentially connected end to end, namely, the small-diameter end of the previous cone barrel structure is connected with the large-diameter end of the next cone barrel structure through a gate valve 8, the axes of the three are superposed, the caliber of the ball valve 3 at the lower part of the gangue chamber 9 is larger than that of the gate valve 8 at the lower part of the middling chamber 7, and the caliber of the gate valve 8 at the lower part of the middling chamber 7 is larger than that of the gate valve 8 at the lower part of the clean coal chamber 5, so that the protection effect of the gate valve 8 at the lower part of the middling chamber 7 and the ball valve 3 at the lower part; wherein the lateral wall of clean coal room 5, the lateral wall of middlings room 7 and the lateral wall of waste rock room 9 are bilayer structure, all include outer 51 and inlayer 52, be equipped with cavity 53 between outer 51 and the inlayer 52, outer 51 is the airtight layer of organism, the material is steel, inlayer 52 is the filter layer, the filter layer is the steel sheet structure of double-deck foraminiferous steel sheet structure or band seam, be equipped with the anticorrosive coating on the steel sheet, prevent that the steel sheet from being corroded, adopt bell mouth or section to be trapezoidal stripe seam, be difficult for blockking up like this, be equipped with the filter screen between the two-layer steel sheet, be used for preventing that raw coal from getting into, be equipped with a plurality of brace rods between the cavity 53, be used for supporting this bilayer. The lower end shells of the clean coal chamber 5, the middling chamber 7 and the gangue chamber 9 are provided with annularly distributed channels 17, namely the channels 17 arranged on the outer layer 51, and the outlets of the channels 17 are arranged in the cavity 53, as shown in fig. 4, the annularly distributed channels 17 are distributed along the circumferential direction of the lower end of each chamber, and the cut direction of the channels 17 is also the circumferential direction, so that the arrangement can have uniform impact on the filter screen during medium filling or gas filling, and plays a role in clearing blockage; one end of the channel 17 is connected with the machine body, and the other end is connected with the medium filling channel 14, the recovery channel and the air filling channel 15 which is connected with the outside or a hot air pipe and is provided with a fifth stop valve 151; the tank-type air bag 11 is arranged on one side of the sorting chamber, the whole body of the tank-type air bag is spherical, of course, the tank-type air bag 11 can be in other shapes, the tank-type air bag 11 comprises a tank body 111 and an elastic air bag 112 arranged in the tank body 111, the elastic air bag 112 is communicated with the upper end of the sorting chamber, and in the embodiment, the elastic air bag 112 is communicated with the upper end of the clean coal chamber 5.

In addition, a medium tank 16 for supplying and storing the medium is further included, and is formed in a shape that is set according to the place of use, and the medium filling passage 14 and the recovery passage are connected to the sorting chamber at one end and to the medium tank 16 at the other end.

It should be noted that the whole equipment is arranged underground or semi-underground, so as to ensure safety, prevent leakage when medium leakage accident occurs, and facilitate recovery and treatment; on the other hand, the whole temperature of the equipment is ensured to be constant, so that the working process of the equipment is not influenced.

Specifically, the medium charging passage 14 is provided with a first stop valve 141, a medium charging pump 142, a first check valve 143, and a second stop valve 144 in sequence; a first stop valve 141 connected to the medium tank 16 for sealing the medium tank 16 against leakage of the gaseous medium, a charge pump 142 for supplying a power source of the medium to the separation chamber, a first check valve 143 for preventing backflow of the medium, and a second stop valve 144 for preventing leakage of the gaseous medium from the separation chamber; the recovery passage is divided into a first recovery passage 13 and a second recovery passage 12, the first recovery passage 13 is sequentially provided with a second check valve 131, a recovery pump 132 and a third stop valve 133, wherein the second check valve 131 is connected with the medium tank 16; the second recycling channel 12 is sequentially provided with a filter 121 for filtering coal dust, a fourth stop valve 122, a vacuum pump 123, a condenser 124, a magnetic pump 125 and a third check valve 126, wherein the third check valve 126 is connected with the medium tank 16, one end of the condenser 124 is further provided with a membrane separator 127, the membrane separator 127 is provided with a channel connected between the fourth stop valve 122 and the vacuum pump 123, and the channel is further provided to be communicated with the outside atmosphere. The first recovery channel 13 is used for recovering liquid medium, the second recovery channel 12 is used for recovering medium in mixed gas, the mixed gas comprises air and gaseous medium, the mixed gas enters the condenser 124 through the filter 121 and the vacuum pump 123, under the action of the condenser 124, most of the medium with a boiling point higher than that of the air is condensed into liquid phase, the liquid phase is sent back to the medium tank 16 through the magnetic pump 125 and the third check valve 126, the rest of the mixed gas containing less medium gas and air is separated through the membrane separator 127, pure gaseous medium is sent back to the condenser 124 through the vacuum pump 123, and finally flows to the medium tank 16, and the pure air is discharged into the atmosphere. Therefore, the separation and recycling of the mixed gas and the emission of the waste gas reaching the standard are realized; it should be noted that, the charging channel 14, the charging channel 15 and the first recovery channel 13 converge into a channel 17 before entering the separation chamber, and the convergence point is at the intersection 18 between the second stop valve 144 of the charging channel 14 and the separation chamber, between the fifth stop valve 151 of the charging channel 15 and the separation chamber, and between the third stop valve 133 of the first recovery channel 13 and the separation chamber, so that the three channels enter and exit the separation chamber together, and can play a role in clearing possible blockages to some extent; the stop valves are all electric control long-closing stop valves and have the same effect.

Further preferred embodiment, pan feeding end 101 of discharge apparatus 10 communicates with each other with waste rock chamber 9 through ball valve 3, its discharge end is equipped with a plurality of chutes 104, each chute 104 is used for discharging different products, be equipped with a plurality of electronic boards that turn over that are used for controlling each chute 104 break-make between pan feeding end 101 and discharge end, so that different products are by different chutes 104 roll-off, the number that electronic board turned over can set up according to specific in service behavior, in this embodiment, chute 104 is equipped with threely, be used for flowing out the clean coal respectively, middlings and waste rock, electronic board that turns over is provided with two, be first electronic board 102 and the electronic board 103 that turns over of second respectively, through controlling electronic board that turns over, realize collecting the classification to different products.