Real heavy liquid non-slime coal preparation technology and equipment

Abstract

The present invention discloses a real heavy liquid coal preparation technology and equipment without coal slime, which relates to the field of heavy medium coal preparation technology. It includes filling: injecting the medium into a closed cavity with an airbag, adjusting the vacuum degree in the cavity so that the airbag is in a compressed state, and condensing, membrane separating and recycling the extracted air and medium steam; sorting: injecting raw coal into the cavity, the raw coal is layered in the medium to form clean coal, medium coal and gangue layers, and the products of each layer are classified and stored by a layering device, and the airbag is filled at this time; removing the medium: filtering and recycling the liquid medium, adjusting the vacuum degree, evaporating the residual medium, and filling the cavity with air or hot air, and recycling it through condensation and membrane separation; discharging: collecting the obtained products by classification through the discharging equipment, which solves the problems of poor sorting accuracy of the existing dry coal preparation technology, complex wet coal preparation process, high washing cost, high product moisture content and environmental pollution caused by the coal slime produced, and failure to meet the use needs of downstream industries.

Description

Technical Field

[0001] The present invention relates to the technical field of heavy medium coal preparation, and more specifically to a true heavy liquid coal preparation technology and equipment without coal slime. Background Art

[0002] China is rich in coal resources, which are distributed in all provinces except Shanghai, but the distribution is extremely uneven. The area between the Greater Khingan Range, Taihang Mountain and Helan Mountain in northern China, including all or most of the six provinces of Inner Mongolia, Shanxi, Shaanxi, Ningxia, Gansu and Henan, where the coal resources are more than 100 billion tons, is the area where China's coal resources are concentrated, accounting for about 50% of the country's total coal resources.

[0003] In the current coal preparation process, there are dry and wet coal preparation methods. At present, the dry selection method has poor sorting accuracy. Most of the time, it only serves as a pre-discharge of gangue, and sometimes only as the previous link of further sorting; the mainstream wet coal preparation processes include jigging, heavy medium shallow trough and heavy medium cyclone. Among them, the jigging method uses wind and water to stratify the raw coal, and there is also a problem of poor sorting accuracy; the heavy medium method uses heavy suspension as the medium, which is a two-phase fluid with a certain density of magnetite powder and water, so that the raw coal is stratified in the medium. Because it is a simulated heavy liquid, there is a problem of difficult density control. All wet coal preparation methods have the following common disadvantages: 1. The process is complex, the energy consumption is high, the equipment and pipelines are of various types, the maintenance volume is extremely large, and the operating cost is high. In addition, the water washing method not only wastes water resources, but also produces a large amount of coal slime water, which requires a large amount of flotation, concentration, dehydration and drying equipment for treatment, and also has a negative impact on the environment. 2. Clean coal and coal slime products have high moisture content. At present, it is difficult to make further technical breakthroughs in both clean coal dehydration equipment and coal slime dehydration equipment. The high moisture content of the products causes high logistics costs. Coal slime with high moisture content not only causes environmental problems, but also cannot directly meet the increasing moisture requirements of downstream industries such as power plants. For example, the dehydrated coal slime needs to be further dried, crushed or mixed with clean coal for use.

[0004] Therefore, how to solve the technical problems of poor sorting accuracy of existing dry coal preparation technology, complex wet coal preparation process, high washing cost, high product moisture content and environmental pollution caused by the coal slime it produces, and inability to meet the use needs of downstream industries has become an important technical problem that technical personnel in this field need to solve. Summary of the invention

[0005] The purpose of the present invention is to provide a real heavy liquid coal slime-free coal preparation technology and equipment to solve the technical problems of poor sorting accuracy of existing dry coal preparation technology, complex process of wet coal preparation technology, high washing cost, high product moisture content and environmental pollution caused by the coal slime produced, and failure to meet the use needs of downstream industries. The many technical effects that can be produced by the preferred technical solution among the many technical solutions provided by the present invention are described in detail below.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The real heavy liquid coal preparation technology without coal slime provided by the present invention comprises the following steps:

[0008] Filling: injecting liquid medium into a closed cavity connected to an elastic airbag, adjusting the vacuum degree in the closed cavity to make the elastic airbag in a compressed state, and at the same time condensing and membrane separating and recycling the extracted air and the steam of the medium;

[0009] Sorting: Put the raw coal containing coal and gangue into the closed cavity, the raw coal is layered in the medium to form a clean coal layer, a medium coal layer and a gangue layer, and the products of each layer are classified and stored by the layering device, and the elastic airbag is filled at this time;

[0010] De-mediuming: Filter and recover the liquid medium, then adjust the vacuum degree in the closed chamber to make the remaining medium evaporate quickly and be drawn away, then fill the closed chamber with air or hot air to completely de-medium the three products in the sorting chamber; recover the drawn vapor medium by a comprehensive method of condensation and membrane separation;

[0011] Discharging: The products are collected and classified through the discharging equipment.

[0012] Based on the above technical solution, the present invention can also be improved as follows.

[0013] Furthermore, the medium is dichlorotrifluoroethane or trichlorotrifluoroethane.

[0014] Furthermore, the number of the elastic airbags is not limited, but the total volume is not less than the volume of the raw coal put in at one time or the volume of the liquid medium filled in at one time.

[0015] The present invention also provides a device for implementing the above true heavy liquid non-slime coal preparation technology, comprising:

[0016] A silo for storing the raw coal;

[0017] A sorting chamber for sorting raw coal is arranged below the silo, and the sorting chamber includes a clean coal chamber, a medium coal chamber and a gangue chamber from top to bottom, and an air lock feeder for supplying the raw coal to the sorting chamber and a ball valve for controlling the connection and disconnection between the sorting chamber and the silo are arranged between the clean coal chamber and the silo;

[0018] The discharge device for discharging various products obtained after sorting is provided below the gangue chamber, and the ball valve for controlling the connection and disconnection between the gangue chamber and the discharge device is provided between the discharge device and the gangue chamber;

[0019] 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 provided, and the gate valves are the above-mentioned stratification devices;

[0020] The separation chamber and two ball valves arranged above and below the separation chamber together constitute the above-mentioned closed cavity;

[0021] The lower end shells of the clean coal chamber, the medium coal chamber and the gangue chamber are all provided with circumferentially arranged channels, and the channels include a charging channel, a recovery channel and an air charging channel connected to the outside or a hot air pipe and provided with a fifth stop valve;

[0022] One end of the medium filling channel and the recovery channel are both connected to a medium tank for providing the medium;

[0023] A tank-type airbag connected to the sorting chamber comprises a tank body communicated with the atmosphere and the elastic airbag arranged in the tank body, and the elastic airbag is communicated with the upper end of the clean coal chamber.

[0024] Furthermore, the medium filling channel is sequentially provided with a first stop valve, a medium filling pump, a first check valve and a second stop valve, and the first stop valve is connected to the medium tank; the recovery channel includes a first recovery channel and a second recovery channel, and 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 to the medium tank; 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 to the medium tank.

[0025] Furthermore, a membrane separator is provided at one end of the condenser; 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 to the outside atmosphere.

[0026] Furthermore, the feed end of the discharging device is connected to the gangue chamber through the ball valve, and the discharging end has multiple chutes for discharging different products. Multiple electric flaps for controlling the on and off of each chute are provided between the feed end and the discharging end.

[0027] Furthermore, the clean coal chamber, the medium coal chamber and the gangue chamber are all conical barrel structures and are composed of double layers, the outer layer is the outer shell of the sorting chamber, the inner layer is a filter layer with a filter screen, a cavity is provided between the inner layer and the outer layer, and the cavities in the above-mentioned chambers are independent of each other; the filling channel, the recovery channel and the interface between the inflation channel and the sorting chamber are all arranged in the cavity.

[0028] Furthermore, the tops of the middle coal chamber and the gangue chamber are respectively provided with online densitometers for detecting the specific gravity of the middle coal seam.

[0029] Furthermore, a liquid level meter for measuring the liquid level of the medium in the clean coal chamber is provided at the top of the clean coal chamber.

[0030] The true heavy liquid coal preparation technology without coal slime in the technical solution provided by the present invention comprises the following steps:

[0031] Filling: inject liquid medium into a closed cavity connected to an elastic airbag, adjust the vacuum degree in the closed cavity to compress the elastic airbag, and at the same time separate and recover the extracted air and medium vapor through condensation and membrane separation; Sorting: put raw coal containing coal and gangue into a closed cavity, and the raw coal is stratified in the medium to form a clean coal layer, a medium coal layer and a gangue layer. The products of each layer are classified and stored through a stratification device, and the elastic airbag is filled at this time; De-mediuming: filter and recover the liquid medium, and then adjust the vacuum degree in the closed cavity to make the residual medium evaporate quickly, and fill the closed cavity with atmosphere or hot air, and recover the medium through a comprehensive method of condensation and membrane separation; Discharging: the obtained products are classified and collected through the discharging equipment. This coal preparation method is a brand-new process. The de-mediuming process of this method is simple. Since it uses real heavy liquid as the medium, the sorting accuracy is higher than the current heavy medium method that uses simulated heavy liquid as the medium. Since it does not produce coal slime, no special equipment is required to treat the coal slime, which simplifies the process and saves costs, thus solving the technical problems of poor sorting accuracy of existing dry coal preparation technology, complex wet coal preparation process, high washing cost, high moisture content of the product, pollution of the environment by the coal slime it produces, and failure to meet the use needs of downstream industries. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a structural schematic diagram of the coal preparation equipment and the coal preparation process in the embodiment of the present invention;

[0034] Figure 2 Schematic diagram of the connection structure of the clean coal chamber, the medium coal chamber and the gangue chamber in the embodiment of the present invention;

[0035] Figure 3 It is a structural schematic diagram of the material distribution equipment in an embodiment of the present invention;

[0036] Figure 4 It is a schematic cross-sectional structure diagram of the connection between the channel and the device in the embodiment of the present invention.

[0037] In the figure: 1, silo; 2, air lock feeder; 3, ball valve; 4, liquid level meter; 5, clean coal chamber; 51, outer layer; 52, inner layer; 53, cavity; 6, online density meter; 7, middle coal chamber; 8, gate valve; 9, gangue chamber; 10, discharge equipment; 101, feeding end; 102, first electric flap; 103, second electric flap; 104, chute; 11, tank airbag; 111, tank body; 112, elastic airbag; 12, second recovery channel; 121, filter; 122, fourth stop valve; 1 23. Vacuum pump; 124. Condenser; 125. Magnetic pump; 126. Third check valve; 127. Membrane separator; 13. First recovery channel; 131. Second check valve; 132. Recovery pump; 133. Third stop valve; 14. Filling channel; 141. First stop valve; 142. Filling pump; 143. First check valve; 144. Second stop valve; 15. Inflation channel; 151. Fifth stop valve; 16. Medium tank; 17. Channel; 18. Intersection point; 19. Organic vapor sensor. DETAILED DESCRIPTION

[0038] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0039] The purpose of this specific implementation method is to provide a true heavy liquid coal slime-free coal preparation technology and equipment. The use of this method for coal preparation will not produce coal slime, so there is no need for special equipment to treat the coal slime, thereby simplifying the process, saving costs, and avoiding the problem of large amounts of coal slime with high water content polluting the environment and the use of downstream manufacturers. It solves the technical problems of poor sorting accuracy of existing dry coal preparation technology, complex wet coal preparation process, high washing cost, high product moisture content, and the pollution of the environment by the coal slime it produces, and the inability to meet the use needs of downstream industries.

[0040] The following is an explanation of the embodiments with reference to the accompanying drawings. In addition, the embodiments shown below do not limit the invention described in the claims. In addition, the entire contents of the configurations shown in the following embodiments are not limited to the solutions required as the invention described in the claims.

[0041] The invention provides a true heavy liquid coal preparation technology without coal slime, comprising a medium filling stage: injecting a medium into a closed cavity, wherein the medium is trifluorodichloroethane or trifluorotrichloroethane, trifluorodichloroethane is used in spring, autumn and winter, and trifluorotrichloroethane is used in summer, the density of such medium is between that of coal and gangue, the chemical properties are stable, the boiling point is low, the specific heat capacity is low, it is easy to recover, and there is very little residue, so no coal slime is generated, of course, the medium can also be a material with a density between that of coal and gangue, a low boiling point, easy volatility, small heat capacity, and small viscosity; the closed cavity is also connected to an elastic airbag 112, the number of the elastic airbags 112 is not limited, but the total volume of each elastic airbag 112 is not less than any one of the volume of the raw coal to be input at one time and the volume of the medium, so as to ensure that the excess volume of the gas due to the occupied space when feeding in the closed cavity has a place to be stored, and secondly, to ensure that no negative pressure is generated when the liquid medium is recovered from the sorting chamber. The raw coal refers to a mixture of coal and gangue. The vacuum degree of the closed cavity is adjusted to make the elastic airbag 112 in a compressed state, and at the same time, the mixed gas of air and medium steam in the closed cavity is condensed, membrane separated, and recovered.

[0042] Sorting stage: the raw coal is put into the closed cavity. Since the coal and gangue have different densities, they will be quickly stratified in the medium to form a clean coal layer, a medium coal layer and a gangue layer. At this time, the elastic airbag 112 is filled, and then the layers are separated and stored through the stratification device.

[0043] De-mediuming stage: The liquid medium is filtered and recovered. At this time, a small amount of medium still remains on the surface of the various stratified product coals. The vacuum degree in the closed cavity is adjusted to evaporate and extract the residual medium. Then, the atmosphere or hot air is filled into the cavity to further accelerate the evaporation. The formed mixed gas is then recovered by condensation, and the residual gas is further recovered by membrane separation. The waste gas is discharged after being treated to meet the requirements.

[0044] Discharging: The obtained products are collected and classified through the discharging equipment 10. The products here can be clean coal and gangue or clean coal, medium coal and gangue. The washing chamber can be set as a combination of clean coal chamber 5, medium coal chamber 7 and gangue chamber 9 or a combination of clean coal chamber 5 and gangue chamber 9 as needed to obtain different products.

[0045] This true heavy liquid coal preparation technology is a brand-new process. The de-mediuming process of this method is simple. Since it uses true heavy liquid as the medium, the sorting accuracy is higher than the current heavy medium method that uses simulated heavy liquid as the medium. Since it does not produce coal slime, no special equipment is required to treat the coal slime, which simplifies the process and saves costs, thus solving the technical problems of poor sorting accuracy of existing dry coal preparation technology, complex wet coal preparation process, high washing cost, high product moisture content, environmental pollution caused by the coal slime it produces, and failure to meet the use needs of downstream industries.

[0046] The present invention also provides a device for implementing the above true heavy liquid non-slime coal preparation technology, please refer to Figure 1-4 The equipment provided in this embodiment includes: a silo 1 for storing raw coal, a sorting chamber arranged below the silo 1, and the sorting chamber is a cavity for sorting raw coal. Here, the sorting chamber can be three chambers, or two chambers or more chambers, which can be set according to the market demand for product types. In this embodiment, the sorting chamber is three chambers, which are a clean coal chamber 5, a medium coal chamber 7 and a gangue chamber 9 from top to bottom. The three chambers are connected together by a gate valve 8 and a flange. An air lock feeder 2 for providing raw coal to the sorting chamber and a ball valve 3 arranged below the air lock feeder 2 are provided between the sorting chamber and the silo 1. , the air-locking feeder 2 and the ball valve 3 are connected to the silo 1 and the clean coal chamber 5 through flanges; the function of the ball valve 3 is to control the on-off between the silo 1 and the sorting chamber, and at the same time play a sealing role; gate valves 8 are provided between the clean coal chamber 5 and the medium coal chamber 7, and between the medium coal chamber 7 and the gangue chamber 9. The function of the gate valve 8 is to control the on-off between the chambers and to cut off the products of each layer. The gate valve 8 is the above-mentioned stratification device; a discharge device 10 for discharging various products obtained after sorting is also provided below the gangue chamber 9. A ball valve 3 is also provided between the discharge device 10 and the gangue chamber 9, and the function is the same as that of the above-mentioned ball valve 3. In this embodiment, all ball valves 3 are tough ceramic ball valves, and all gate valves 8 are electric flat gate valves. The clean coal chamber 5, the medium coal chamber 7, the gangue chamber 9 and each ball valve 3 together constitute the closed cavity of the above-mentioned filling stage.

[0047] The silo 1, the clean coal chamber 5, the middle coal chamber 7 and the gangue chamber 9 are all cone barrel structures, which are connected head to tail in sequence, that is, the small diameter end of the upper cone barrel structure is connected to the large diameter end of the lower cone barrel structure through the gate valve 8, and the axes of the three coincide. The diameter of the ball valve 3 at the bottom of the gangue chamber 9 is larger than the diameter of the gate valve 8 at the bottom of the middle coal chamber 7, and the diameter of the gate valve 8 at the bottom of the middle coal chamber 7 is larger than the diameter of the gate valve 8 at the bottom of the clean coal chamber 5, so as to ensure the protection of the gate valve 8 at the bottom of the middle coal chamber 7 and the ball valve 3 at the bottom of the gangue chamber 9 during material discharge and smooth material discharge; the side of the clean coal chamber 5 is The side walls of the clean coal chamber 5, the middle coal chamber 7 and the gangue chamber 9 are all double-layer structures, including an outer layer 51 and an inner layer 52, with a cavity 53 between the outer layer 51 and the inner layer 52. The outer layer 51 is the sealed layer of the machine body, made of steel, and the inner layer 52 is a filter layer, which is a double-layer perforated steel plate structure or a steel plate structure with slits. The steel plate is provided with an anti-corrosion layer to prevent the steel plate from being corroded. Conical holes or slits with a trapezoidal cross section are used, so that it is not easy to be blocked. A filter screen is provided between the two layers of steel plates to prevent raw coal from entering. A plurality of supporting ribs are provided between the cavities 53 to support the double-layer structure. The lower end shells of the clean coal chamber 5, the middle coal chamber 7 and the gangue chamber 9 are provided with annularly distributed channels 17, that is, the channels 17 arranged on the outer layer 51, and their outlets are arranged in the cavity 53, such as Figure 4 As shown, the annular distribution refers to the circumferential distribution of each channel 17 along the lower end of each chamber, and the cut direction of the channel 17 is also the circumferential direction. This arrangement can have a uniform impact on the filter screen during filling or inflation, which plays a role in clearing blockage; one end of the channel 17 is connected to the body, and the other end is connected to the filling channel 14, the recovery channel and the inflation channel 15 connected to the outside or the hot air pipe and provided with a fifth stop valve 151; a tank-type airbag 11 is also provided on one side of the sorting chamber, which is spherical as a whole, and of course can also be other shapes. The tank-type airbag 11 includes a tank body 111 and an elastic airbag 112 arranged in the tank body 111, and the elastic airbag 112 is connected to the upper end of the sorting chamber. In this embodiment, the elastic airbag 112 is connected to the upper end of the clean coal chamber 5.

[0048] In addition, a medium tank 16 for providing and storing medium is also included, and its shape can be set according to different places of use. One end of the filling channel 14 and the recovery channel is connected to the sorting chamber, and the other end thereof is connected to the medium tank 16.

[0049] It should be noted that the entire equipment is installed underground or semi-underground. On the one hand, it is to ensure safety so that when a medium leakage accident occurs, it will not leak out and is easy to recycle and process; on the other hand, it is to ensure that the overall temperature of the equipment is constant so that its working process is not affected.

[0050] Specifically, the medium filling channel 14 is provided with a first stop valve 141, a medium filling pump 142, a first check valve 143 and a second stop valve 144 in sequence; the first stop valve 141 is connected to the medium tank 16, and is used to seal the medium tank 16 to prevent leakage of the gaseous medium; the medium filling pump 142 is a power source for providing the medium to the sorting chamber; the first check valve 143 is a device for preventing the medium from flowing back; the second stop valve 144 is used to prevent the gaseous medium from leaking from the sorting chamber; the recovery channel is divided into a first recovery channel 13 and a second recovery channel 12, and the first recovery channel 13 is provided with a second check valve 143 in sequence; 131, a recovery pump 132 and a third stop valve 133, wherein the second check valve 131 is connected to the medium tank 16; the second recovery 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 to the medium tank 16, and a membrane separator 127 is also provided at one end of the condenser 124, and a channel is provided on the membrane separator 127 connected between the fourth stop valve 122 and the vacuum pump 123, and it is also provided with a channel connected to the outside atmosphere. The first recovery channel 13 is used to recover liquid medium, and the second recovery channel 12 is used to recover medium in mixed gas, where the mixed gas includes 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 higher boiling point than air is condensed into liquid phase and sent back to the medium tank 16 through the magnetic pump 125 and the third check valve 126. The remaining mixed gas containing less medium and air is separated by the membrane separator 127, and the 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 relatively pure air is discharged into the atmosphere. In this way, the separation, recycling and emission of qualified waste gas of the mixed gas are achieved; it should be noted that the charging channel 14, the inflation channel 15 and the first recovery channel 13 will converge into a channel 17 before entering the sorting chamber, and the convergence point is the intersection 18 between the second stop valve 144 of the charging channel 14 and the sorting chamber, between the fifth stop valve 151 of the inflation channel 15 and the sorting chamber, and between the third stop valve 133 of the first recovery channel 13 and the sorting chamber. In this way, the three channels enter and exit the sorting chamber together, which can clear possible blockages to a certain extent; the above-mentioned stop valves are all electrically controlled long-closed stop valves and have the same function.

[0051] In a further preferred embodiment, the feed end 101 of the discharging equipment 10 is connected to the gangue chamber 9 through the ball valve 3, and a plurality of chutes 104 are provided at the discharge end, each chute 104 is used to discharge different products, and a plurality of electric flaps for controlling the on and off of each chute 104 are provided between the feed end 101 and the discharge end, so that different products can slide out from different chutes 104, and the number of electric flaps can be set according to specific usage conditions. In the present embodiment, three chutes 104 are provided, which are used to flow out clean coal, medium coal and gangue respectively, and two electric flaps are provided, namely the first electric flap 102 and the second electric flap 103. By controlling the electric flaps, the classified collection of different products can be realized.

[0052] In a specific implementation method, an online density meter 6 is provided at the top of the middle coal chamber 7 and the gangue chamber 9. The two online density meters 6 are respectively provided at the top of the middle coal chamber 7 and the gangue chamber 9, and are mainly used to monitor whether the layering position of the three products is just at the position of the gate valve 8. If the online density meter 6 at the top of the middle coal chamber 7 measures that the liquid density exceeds the preset density allowable range, it means that there is a situation where the middle coal is mixed into the clean coal chamber 5 or the middle coal chamber 7 is mixed with clean coal. Through signal feedback, the system automatically adjusts the liquid level so that the liquid density is within the preset density allowable range. Similarly, the function of the online density meter 6 at the top of the gangue chamber 9 is the same. In this way, through intelligent automatic control, it can be well ensured that the gate valve 8 can accurately separate the three types of products, namely, clean coal, middle coal and gangue. A liquid level meter 4 is also provided in the sorting chamber for detecting the liquid level in the sorting chamber. Here, the liquid level meter 4 is provided at the top of the clean coal chamber 5 to detect the liquid level in the clean coal chamber 5.

[0053] In a preferred embodiment, an organic vapor sensor 19 is provided on the pipeline between the filter 121 and the fourth stop valve 122 to ensure that the three products are completely de-intermediate and whether they are completely de-intermediate is monitored. An organic vapor sensor 19 is also provided on the exhaust gas end of the membrane separator 127 to monitor the exhaust gas discharged into the atmosphere.

[0054] It should be noted that this embodiment only provides a set of equipment, which can be considered as a single machine, but in other embodiments, multiple single machines can be combined into a unit to achieve continuous production and efficient circulation of the medium between the individual machines.

[0055] Combined with the real heavy liquid non-slime coal preparation technology and equipment, the specific operation process is as follows:

[0056] First, the flat gate valves between the clean coal chamber 5 and the medium coal chamber 7, and between the medium coal chamber 7 and the gangue chamber 9 are opened, and the tough ceramic ball valves on the top of the clean coal chamber 5 and the bottom of the gangue chamber 9 are closed; the vacuum pump 123 is turned on to a predetermined vacuum degree to make the elastic airbag 112 in a compressed state and then the pump is stopped; the first stop valve 141 and the second stop valve 144 are opened, and the liquid medium in the medium tank 16 is injected into the sorting chamber through the medium filling pump 142, and the pump is stopped after reaching the predetermined liquid level and the first stop valve 141 and the second stop valve 144 are closed; at the same time, the extracted air and gaseous medium are passed through the condenser 124 and the membrane separator 127 to recover the medium, and the waste gas is discharged after being treated.

[0057] Secondly, open the ball valve 3 between the silo 1 and the clean coal chamber 5, and send the preset amount of raw coal for washing into the medium of the sorting chamber. The clean coal, medium coal and gangue are quickly stratified in the medium due to their different specific gravities to form a clean coal layer, a medium coal layer and a gangue layer. At this time, the elastic airbag 112 is filled.

[0058] Once again, after the stratification is completed, close the ball valve 3 on the top of the clean coal chamber 5, the flat gate valve between the clean coal chamber 5 and the medium coal chamber 7, and the medium coal chamber 7 and the gangue chamber 9; open the third stop valve 133, the recovery pump 132 and the second check valve 131, suck the liquid medium filtered by the filter layer in each chamber back into the medium tank 16 and then stop the pump; open the vacuum pump 123 and the fourth stop valve 122, so that the liquid medium remaining on the surface of the clean coal, medium coal and gangue particles evaporates quickly and is pumped away, and at the same time, the atmosphere or hot air is connected to each chamber through the inflation channel 15 until the medium is completely evaporated and pumped away At this time, three kinds of products, namely, pure clean coal, medium coal and gangue, remain in each chamber; the mixed gas containing gaseous medium and air drawn away by the vacuum pump 123 is condensed by the condenser 124. Under the action of the condenser 124, most of the medium with a higher boiling point than air is condensed into liquid phase and sent back to the medium tank 16 through the magnetic pump 125 and the third check valve 126. The remaining mixed gas containing less medium and air is separated by the membrane separator 127, and the pure medium is sent back to the condenser 124 through the vacuum pump 123 and finally flows to the medium tank 16, and the relatively pure air is discharged into the atmosphere.

[0059] Finally, the tough ceramic ball valve at the bottom of the gangue chamber 9 is opened, and the gangue is discharged into the corresponding chute 104; the second electric flap 103 is controlled to rotate, and the flat gate valve at the bottom of the medium coal chamber 7 is opened, and the medium coal falls into the corresponding chute 104; the second electric flap 103 and the first electric flap 102 are controlled to rotate again, and the flat gate valve at the bottom of the clean coal chamber 5 is opened, and the clean coal falls into the corresponding chute 104.

[0060] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A true heavy liquid coal slime-free coal preparation method, characterized in that: Includes steps: Filling the medium: injecting a liquid medium into a sealed cavity connected to the elastic airbag (112), adjusting the vacuum degree in the sealed cavity so that the elastic airbag (112) is in a compressed state, and at the same time, extracting air and the steam of the medium through condensation, membrane separation, and recovery; Sorting: placing raw coal containing coal and gangue into the closed cavity, the raw coal is layered in the medium to form a clean coal layer, a medium coal layer and a gangue layer, and the products of each layer are classified and stored by a layering device, and at this time the elastic airbag (112) is filled; De-mediuming: Filter and recover the liquid medium, then adjust the vacuum degree in the closed chamber to make the remaining medium evaporate quickly and be drawn away, then fill the closed chamber with air or hot air to completely de-medium the three products in the sorting chamber; recover the drawn vapor medium by a comprehensive method of condensation and membrane separation; Discharging: The obtained products are collected by classification through the discharging equipment (10); The medium is trifluorodichloroethane or trifluorotrichloroethane.

2. The true heavy liquid non-slime coal preparation method according to claim 1, characterized in that: The number of the elastic airbags (112) is not limited, but the total volume is not less than the volume of the raw coal fed in at one time or the volume of the liquid medium charged in at one time.

3. The true heavy liquid non-slime coal preparation method according to claim 1, characterized in that: The equipment used in this method includes: A silo (1) for storing the raw coal; A sorting chamber for sorting raw coal is provided below the silo (1), the sorting chamber comprising, from top to bottom, a clean coal chamber (5), a medium coal chamber (7) and a gangue chamber (9); an air lock feeder (2) for supplying the raw coal to the sorting chamber and a ball valve (3) for controlling the connection between the sorting chamber and the silo (1) are provided between the clean coal chamber (5) and the silo (1); The discharge device (10) for discharging various products obtained after sorting is provided below the gangue chamber (9), and the ball valve (3) for controlling the connection and disconnection between the gangue chamber (9) and the discharge device (10) is provided between the discharge device (10) and the gangue chamber (9); Gate valves (8) for controlling the on-off of the clean coal chamber (5) and the middle coal chamber (7), and between the middle coal chamber (7) and the gangue chamber (9) are provided, and the gate valves (8) are the above-mentioned stratification devices; The separation chamber and two ball valves (3) arranged above and below the separation chamber together constitute the above-mentioned closed cavity; The clean coal chamber (5), the medium coal chamber (7) and the lower end shell of the gangue chamber (9) are all provided with a circumferentially arranged channel (17), the channel (17) comprising a charging channel (14), a recovery channel and an air charging channel (15) connected to the outside or a hot air pipe and provided with a fifth stop valve (151); One end of the medium filling channel (14) and the recovery channel are both connected to a medium tank (16) for providing the medium; A tank-type airbag (11) connected to the sorting chamber, the tank-type airbag (11) comprising a tank body (111) communicated with the atmosphere and the elastic airbag (112) disposed within the tank body (111), the elastic airbag (112) being communicated with the upper end of the clean coal chamber (5).

4. The true heavy liquid non-slime coal preparation method according to claim 3, characterized in that: The medium charging channel (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, and the first stop valve (141) is connected to the medium tank (16); the recovery channel comprises a first recovery channel (13) and a second recovery channel (12); the first recovery channel (13) is provided with a second check valve (131), a recovery pump (132) and a third stop valve (133) in sequence, and the second check valve (131) is connected to the medium tank (16); the second recovery channel (12) is provided with 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) in sequence, and the third check valve (126) is connected to the medium tank (16).

5. The true heavy liquid non-slime coal preparation method according to claim 4, characterized in that: A membrane separator (127) is also provided at one end of the condenser (124); the membrane separator (127) is provided with a channel connected between the fourth stop valve (122) and the vacuum pump (123); and the membrane separator (127) is provided with a channel connected to the outside atmosphere.

6. The true heavy liquid non-slime coal preparation method according to claim 3, characterized in that: The feed end (101) of the discharge device (10) is in communication with the gangue chamber (9) via the ball valve (3), and the discharge end is provided with a plurality of chutes (104) for discharging different products, and a plurality of electric flaps for controlling the on and off of each of the chutes (104) are provided between the feed end (101) and the discharge end.

7. The true heavy liquid non-slime coal preparation method according to claim 3, characterized in that: The clean coal chamber (5), the medium coal chamber (7) and the gangue chamber (9) are all of a conical barrel structure and are composed of two layers, wherein the outer layer (51) is the outer shell of the separation chamber, and the inner layer (52) is a filter layer with a filter screen. A cavity (53) is provided between the inner layer (52) and the outer layer (51), and the cavities (53) in each of the above chambers are independent of each other; the interface between the filling channel (14), the recovery channel and the inflation channel (15) and the separation chamber is provided in the cavity (53).

8. The true heavy liquid non-slime coal preparation method according to claim 3, characterized in that: The tops of the middle coal chamber (7) and the gangue chamber (9) are respectively provided with online densitometers (6) for detecting the specific gravity of the middle coal seam.

9. The true heavy liquid non-slime coal preparation method according to claim 3, characterized in that: A liquid level meter (4) for measuring the liquid level of the medium in the clean coal chamber (5) is provided at the top of the clean coal chamber (5).

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