Coal slime circulating, mixing and drying system and working method thereof

Abstract

The invention provides a coal slime circulating, mixing and drying system and a working method thereof. The problem that coal slime is difficult to dehydrate and dry is solved. An aeration nozzle is arranged in the mixing preparation box; the mixed preparation box is connected with the slime water feeding valve and the middle material preparation box; the middle material preparation box is connected with the auger mixer, the auger mixer is connected with the regeneration mixing mill through the blanking conveying system, and the regeneration mixing mill is connected with the finished product storage bin through the finished product conveying system; a first outlet of the finished product storage bin is connected with a first packing auger feeder, the first packing auger feeder is connected with a finished product weighing screw conveyor, the finished product weighing screw conveyor is connected with a packing auger mixer, a second outlet is connected with a second packing auger feeder, the second packing auger feeder is connected with a mixing preparation box through a pneumatic conveying device, and a third outlet is connected with a third packing auger feeder; the raw material receiving hopper is connected with the raw material storage bin through the bucket elevator, the raw material storage bin is connected with the raw material weighing screw conveyor through the raw material feeding valve, and the raw material weighing screw conveyor is connected with the regeneration mixing mill.

Description

Technical Field

[0001] The invention relates to a coal slime circulating blending and drying system and a working method thereof, and is mainly applied to coal slime drying fields such as coal washing plants and coal slime processing plants. Background Art

[0003] Coal slime refers to a semi-solid substance formed by coal powder containing water. It is an organic mineral resource formed by the remains of aquatic plants in a swamp environment after long-term compaction and biochemical reactions. It has the characteristics of high moisture content, fine particle size, high content of particles, strong water retention, low calorific value and high viscosity.

[0004] With the improvement of environmental protection requirements and standards, coal slime drying is becoming more and more difficult. Some coal preparation plants do not properly handle coal slime due to the high energy consumption of thermal drying of coal slime and the difficulty in ensuring moisture content of mechanical dehydration. Instead, they discard it as waste, which not only affects the environment but also wastes resources. Therefore, the effective disposal of coal slime has become a problem that plagues the coal industry. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a reasonably designed coal slime circulating blending and drying system and a working method thereof, thereby solving the problem of difficulty in dehydrating and drying coal slime.

[0006] The technical solution adopted by the present invention to solve the above-mentioned problems is: a coal slime circulation blending and drying system, including a raw material adding system, characterized in that: it also includes a mixing preparation system and a finished product unloading system; the mixing preparation system includes a coal slime water feed valve, a mixing preparation box, a coal slime conveying pump and an intermediate preparation box; an aeration nozzle is arranged in the mixing preparation box; the mixing preparation box inlet is connected to the coal slime water feed valve; the mixing preparation box outlet is connected to the intermediate preparation box inlet through the coal slime conveying pump; the finished product unloading system includes an intermediate discharge valve, a Jiaolong mixer, a discharge conveying system, a regeneration mixer, a finished product conveying system, a finished product storage bin, Jiaolong feeders one to three, a finished product discharge valve, a finished product weighing screw machine and a pneumatic conveying device; the intermediate preparation box outlet is connected to the intermediate material inlet of the Jiaolong mixer through the intermediate discharge valve, the Jiaolong mixer outlet is connected to the regeneration mixer inlet through the discharge conveying system, and then The outlet of the raw mixer is connected to the inlet of the finished product storage bin through the finished product conveying system; the finished product storage bin is provided with outlet one, outlet two and outlet three; outlet one is connected to the inlet of Jiaolong feeder one, the outlet of Jiaolong feeder one is connected to the inlet of the finished product weighing screw machine through the finished product discharge valve, and the outlet of the finished product weighing screw machine is connected to the finished material inlet of the Jiaolong mixer; outlet two is connected to the inlet of Jiaolong feeder two, the outlet of Jiaolong feeder two is connected to the finished material inlet of the mixing preparation box through the pneumatic conveying device; outlet three is connected to the inlet of Jiaolong feeder three; the raw material adding system includes a raw material receiving hopper, a bucket elevator, a raw material storage bin, a raw material feed valve and a raw material weighing screw machine; the outlet of the raw material receiving hopper is connected to the inlet of the raw material storage bin through the bucket elevator, the outlet of the raw material storage bin is connected to the inlet of the raw material weighing screw machine through the raw material feed valve, and the outlet of the raw material weighing screw machine is connected to the inlet of the regeneration mixer.

[0007] The top of the mixing preparation box of the present invention is provided with a disc sawtooth agitator, a liquid level meter and a bag dust collector.

[0008] The aeration nozzle described in the present invention comprises a nozzle housing, a fastening hexagon and a threaded pipe; the nozzle housing is fixed to the left end of the fastening hexagon, and the threaded pipe is fixed to the right end of the fastening hexagon; an air flow channel is arranged in the aeration nozzle, and the air flow channel runs through the threaded pipe to the nozzle housing, and the air flow channel is mainly composed of a nozzle inlet, a cavity inlet, a throat-shaped snake cavity, a main body cavity, and an anti-blocking spray hole arranged in sequence from right to left.

[0009] The material unloading conveying system described in the present invention includes a scraper conveyor 1, a rotary feeder and a scraper conveyor 2; the outlet of the Jiaolong mixer is connected to the inlet of the scraper conveyor 1; the outlet of the scraper conveyor 1 is connected to the inlet of the rotary feeder; the outlet of the rotary feeder is connected to the inlet of the scraper conveyor 2; the outlet of the scraper conveyor 2 is connected to the inlet 1 of the regeneration mixer.

[0010] The finished product conveying system described in the present invention includes a Z-type scraper and a screw feeder. The outlet of the regeneration mixer is connected to the inlet of the Z-type scraper, the outlet of the Z-type scraper is connected to the inlet of the screw feeder, and the outlet of the screw feeder is connected to the inlet of the finished product storage bin; the finished product storage bin is provided with a bin gasification component; the exhaust port of the finished product storage bin is connected to a cyclone dust collector, and the outlet of the cyclone dust collector is connected to the return material inlet of the Z-type scraper.

[0011] The top of the finished product storage bin of the present invention is provided with a pressure vacuum release valve 1 and a bag dust collector 2.

[0012] The top of the raw material storage bin of the present invention is provided with a pressure vacuum release valve 2 and a material level meter, and the bottom of the raw material storage bin is provided with a bin wall vibrator.

[0013] The present invention also includes an air-assisted system, which includes an air compressor, an air dryer and an air storage tank; the outlet of the air compressor is connected to the inlet of the air dryer, the outlet of the air dryer is connected to the inlet of the air storage tank, and the outlet of the air storage tank is respectively connected to the air inlet of the pneumatic conveying device and the air inlet of the aeration nozzle.

[0014] The present invention also includes an air fluidization system, which includes a fluidizing fan, an electric heater, an anti-blocking fluidizing component one, an anti-blocking fluidizing component two and an anti-blocking fluidizing component three; the outlet of the fluidizing fan is connected to the inlet of the electric heater, and the outlet of the electric heater is divided into four routes, which are respectively connected to the inlet of the anti-blocking fluidizing component one, the anti-blocking fluidizing component two, the anti-blocking fluidizing component three and the bin gasification component; the outlet of the anti-blocking fluidizing component one is connected to the fluidizing air inlet of the scraper conveyor one; the outlet of the anti-blocking fluidizing component two is connected to the fluidizing air inlet of the scraper conveyor two; the outlet of the anti-blocking fluidizing component three is connected to the fluidizing air inlet of the Z-type scraper.

[0015] A working method of a coal slime circulation blending and drying system, characterized in that the steps are as follows: (1) The coal slurry water with a moisture content of 35 ≤ < 60% from the coal washing plant is transported to the mixing preparation box through the coal slurry water feed valve for temporary storage; (2) The original coal slurry in the mixing preparation tank is stirred, aerated and mixed with the finished coal slurry from the finished product storage bin, and then transported to the intermediate material preparation tank for temporary storage via the coal slurry delivery pump; (3) The intermediate coal slime in the intermediate material preparation box and the finished coal slime from the finished product storage bin are mixed and crushed by the Jiaolong mixer. The mixed and crushed coal slime enters the regeneration mixer through the unloading conveying system and is mixed with the raw materials from the raw material storage bin. The mixed coal slime is transported to the finished product storage bin through the finished product conveying system for storage and standby use; (4) The finished coal slime from outlet 1 of the finished product storage bin is connected to the Jiaolong mixer to be mixed with the intermediate coal slime. The finished coal slime from outlet 2 is connected to the pneumatic conveying device to be mixed with the original coal slime water in the mixing preparation box for stirring and aeration. The finished coal slime from outlet 3 is loaded on trucks for external transportation. (5) The foreign raw materials are loaded into the raw material receiving hopper and lifted to the raw material storage bin by the bucket elevator for temporary storage; (6) The compressed air of the air-assisted system is divided into two routes and enters the pneumatic conveying device and the mixing preparation box for aeration.

[0016] Compared with the prior art, the present invention has the following advantages and effects: 1) The coal sludge can be circulated, blended and dried. The coal sludge can be fully fluidized and further dried during transportation and storage. The final product can be used as a circulating fluidized bed boiler power fuel; 2) The system adopts fully automatic cycle operation, which has good energy-saving benefits; 3) The system adopts a fully enclosed operation, and the on-site environment is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0018] Figure 2 for Figure 1 Schematic diagram of the structure of part A.

[0019] Figure 3 for Figure 1 Schematic diagram of the structure of part B.

[0020] Figure 4 for Figure 1 Schematic diagram of the structure of part C.

[0021] Figure 5 It is a schematic diagram of the front cross-sectional structure of an aeration nozzle according to an embodiment of the present invention.

[0022] Figure 6 It is a left-side structural schematic diagram of an aeration nozzle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0024] 1. The embodiment of the present invention includes a mixing preparation system, a finished product unloading system, a raw material adding system, an air-assisted system and an air fluidization system.

[0025] 2. The mixing preparation system includes a coal slurry water feed valve 1, a mixing preparation box 2, a disc sawtooth agitator 3, a bag dust collector 4, a mixing and filtering component 5, a flushing and cleaning component 6, a coal slurry conveying pump 7, an intermediate preparation box 8 and a hydraulic slide 9.

[0026] The mixing preparation box 2 is a double-layer hollow box structure, the outer layer is a steel structure, and the inner layer is a filter-type high-molecular polytetrafluoroethylene plate structure. There are 4 supporting feet at the bottom of the mixing preparation box 2, and each supporting foot is equipped with a metering sensor to record the weight change of the mixing preparation box 2 in real time. A disc sawtooth stirrer 3, a liquid level meter and a bag dust collector 4 are arranged on the top of the mixing preparation box 2. The mixing preparation box 2 performs gas, solid and liquid three-phase flow mixing and filtering, which can greatly improve work efficiency.

[0027] Three circles of 36 aeration nozzles 42 are arranged around the inner side of the mixing preparation box 2. The aeration nozzle 42 includes a nozzle housing 421, a fastening hexagon 422 and a threaded pipe 423. The aeration nozzle 42 is bullet-shaped, the nozzle housing 421 is fixed to the left end of the fastening hexagon 422, and the threaded pipe 423 is fixed to the right end of the fastening hexagon 422. An air flow channel is arranged in the aeration nozzle 42, and the air flow channel runs from the threaded pipe 423 to the nozzle housing 421. The air flow channel is mainly composed of a nozzle inlet 424, a cavity inlet 425, a throat-shaped snake cavity 426, a main body cavity 427, and an anti-blocking spray hole 428 arranged from right to left. Compressed air enters the cavity inlet 425 from the nozzle inlet 424, and is accelerated into the main body cavity 427 through the throat-shaped snake cavity 426. The main body cavity 427, and finally the aeration air is ejected along 4 evenly distributed anti-blocking spray holes 428, which plays an anti-blocking and aeration role. The mixing preparation box 2 utilizes disc-type sawtooth stirring and annular aeration to effectively solve the problems of easy sedimentation and clogging in the storage of coal slurry.

[0028] The bottom of the mixing preparation box 2 is connected with a mixing and filtering component 5 to remove the filtrate in time and improve the mixing and drying efficiency. The bottom of the mixing preparation box 2 is also connected with a flushing and cleaning component 6.

[0029] The inlet of the mixing and preparing box 2 is connected to the coal slurry water feed valve 1; the outlet of the mixing and preparing box 2 is connected to the inlet of the coal slurry delivery pump 7, and the outlet of the coal slurry delivery pump 7 is connected to the inlet of the intermediate material preparation box 8 through the coal slurry delivery pipeline. A hydraulic slide 9 is provided at the bottom of the intermediate material preparation box 8.

[0030] 3. The finished product unloading system includes an intermediate discharge valve 10, an intermediate material weighing screw machine 11, a Jiaolong mixer 12, a scraper conveyor 13, a rotary feeder 14, a scraper conveyor 2 15, a regeneration mixer 16, a Z-type scraper machine 17, a screw feeder 18, a finished product storage bin 19, a pressure vacuum release valve 1 20, a bag dust collector 2 21, a bin gasification component 22, a Jiaolong feeder 1 23, a finished product discharge valve 24, a finished product weighing screw machine 25, a Jiaolong feeder 2 26, a pneumatic conveying device 27, a Jiaolong feeder 3 28 and a cyclone dust collector 29.

[0031] The outlet of the intermediate material preparation box 8 is connected to the inlet of the intermediate discharge valve 10; the outlet of the intermediate discharge valve 10 is connected to the inlet of the intermediate material weighing screw machine 11; the outlet of the intermediate material weighing screw machine 11 is connected to the intermediate material inlet of the Jiaolong mixer 12; the outlet of the Jiaolong mixer 12 is connected to the inlet of the scraper conveyor 13; the outlet of the scraper conveyor 13 is connected to the inlet of the rotary feeder 14; the outlet of the rotary feeder 14 is connected to the inlet of the scraper conveyor 2 15; the outlet of the scraper conveyor 2 15 is connected to the inlet 1 of the regeneration mixer 16; the outlet of the regeneration mixer 16 is connected to the inlet of the Z-type scraper 17; the outlet of the Z-type scraper 17 is connected to the inlet of the screw feeder 18; the outlet of the screw feeder 18 is connected to the inlet of the finished product storage bin 19.

[0032] The finished product storage bin 19 is provided with three finished product outlets, outlet 1, outlet 2 and outlet 3, which are respectively used for intermediate material mixing, original coal slurry water mixing and finished product loading. The outlet 1 is connected to the inlet of Jiaolong feeder 1 23, the outlet of Jiaolong feeder 1 23 is connected to the inlet of finished product discharge valve 24, the outlet of finished product discharge valve 24 is connected to the inlet of finished product weighing screw machine 25, and the outlet of finished product weighing screw machine 25 is connected to the finished product inlet of Jiaolong mixer 12. The outlet 2 is connected to the inlet of Jiaolong feeder 2 26, the outlet of Jiaolong feeder 2 26 is connected to the inlet of pneumatic conveying device 27, the outlet of pneumatic conveying device 27 is connected to the pneumatic conveying pipeline of finished product, and is transported to the finished product inlet of mixing preparation box 2 through the pneumatic conveying pipeline. The outlet 3 is connected to the inlet of Jiaolong feeder 3 28, and Jiaolong feeder 3 28 loads finished coal slurry for external transportation.

[0033] The top of the finished product storage bin 19 is provided with a pressure vacuum release valve 1 20 and a bag dust collector 2 21, and the lower middle part is provided with a bin gasification assembly 22. The exhaust port of the finished product storage bin 19 is connected to the inlet of the cyclone dust collector 29 for filtering the gasified air in the storage bin, and the outlet of the cyclone dust collector 29 is connected to the return material inlet of the Z-type scraper 17.

[0034] 4. The raw material adding system includes a raw material receiving hopper 30, a bucket elevator 31, a raw material storage bin 32, a pressure vacuum release valve 33, a bin wall vibrator 34, a raw material feed valve 35 and a raw material weighing screw machine 36.

[0035] The outlet of the raw material receiving hopper 30 is connected to the inlet of the bucket elevator 31, and the outlet of the bucket elevator 31 is connected to the inlet of the raw material storage bin 32. The raw material enters the bucket elevator 31 through the raw material receiving hopper 30 and is lifted to the raw material storage bin 32 by the bucket elevator 31. The outlet of the raw material storage bin 32 is connected to the inlet of the raw material feed valve 35, and the outlet of the raw material feed valve 35 is connected to the inlet of the raw material weighing screw machine 36, and the outlet of the raw material weighing screw machine 36 is connected to the second inlet of the regeneration mixer 16. The top of the raw material storage bin 32 is provided with a pressure vacuum release valve 2 33 and a material level meter, and the bottom of the cone of the raw material storage bin 32 is provided with a bin wall vibrator 34.

[0036] 5. The air-assisted system includes an air compressor 37, an air dryer 38 and an air storage tank 39. The outlet of the air compressor 37 is connected to the inlet of the air dryer 38, and the outlet of the air dryer 38 is connected to the inlet of the air storage tank 39. The air storage tank 39 is provided with a safety valve, a pressure gauge and a drain valve. The outlet of the air storage tank 39 is connected to the air inlet of the pneumatic conveying device 27 and the air inlet of the aeration nozzle 42 respectively.

[0037] 6. The air fluidization system includes a fluidization fan 40, an electric heater 41, an anti-blocking fluidization component 1 43, an anti-blocking fluidization component 2 44 and an anti-blocking fluidization component 3 45.

[0038] The outlet of the fluidizing fan 40 is connected to the inlet of the electric heater 41. A fluidizing air main pipe is provided on the outlet of the electric heater 41. A pressure transmitter and an on-site pressure gauge are provided on the fluidizing air main pipe to monitor the fluidizing air pressure. The outlet of the electric heater 41 is divided into four routes, which are respectively connected to the inlet of the anti-blocking fluidizing component 1 43, the anti-blocking fluidizing component 2 44, the anti-blocking fluidizing component 3 45 and the silo gasification component 22; the outlet of the anti-blocking fluidizing component 1 43 is connected to the fluidizing air inlet of the scraper conveyor 13; the outlet of the anti-blocking fluidizing component 2 44 is connected to the fluidizing air inlet of the scraper conveyor 2 15; the outlet of the anti-blocking fluidizing component 3 45 is connected to the fluidizing air inlet of the Z-type scraper 17.

[0039] 7. The working method of the coal slime circulation blending and drying system of the present invention comprises the following steps: (1) Coal slurry with a moisture content of 35 ≤ < 60% from the coal washing plant is transported to the mixing preparation box 2 through the coal slurry feed valve 1 for temporary storage; (2) The original coal slime water in the mixing preparation tank 2 and the finished coal slime from the finished product storage bin 19 are stirred and aerated, and the filtered and prepared coal slime is transported to the intermediate material preparation tank 8 for temporary storage via the coal slime delivery pump 7; (3) The intermediate coal slime in the intermediate material preparation box 8 and the finished coal slime from the finished product storage bin 19 are mixed and crushed by the Jiaolong mixer 12. The mixed and crushed coal slime is conveyed by the scraper conveyor 13 and fed by the rotary feeder 14, and then enters the regeneration mixer 16 to be mixed with the raw materials from the raw material storage bin 32. The mixed coal slime is conveyed to the finished product storage bin 19 by the Z-type scraper 17 and the screw conveyor 18 for storage and standby use; (4) The finished coal slime from the outlet 1 of the finished product storage bin 19 is connected to the Jiaolong mixer 12 for mixing with the intermediate coal slime. The finished coal slime from the outlet 2 is connected to the pneumatic conveying device 27 for mixing and aeration with the original coal slime water in the mixing preparation box 2. The finished coal slime from the outlet 3 is loaded on trucks for external transportation. (5) The foreign raw materials are unloaded into the raw material receiving hopper 30 and then lifted to the raw material storage bin 32 by the bucket elevator 31 for temporary storage; (6) The compressed air of the air-assisted system is dried and filtered by the air dryer 38 and then enters the air storage tank 39 for pressure stabilization. The compressed air from the air storage tank 39 is divided into two paths and enters the pneumatic conveying device 27 and the mixing preparation box 2 for aeration. The auxiliary tail gas is filtered by the bag dust collector 4 on the top of the mixing preparation box and then discharged into the atmosphere; (7) The fluidizing air of the air fluidization system is heated by an electric heater 41 and then divided into three routes for air fluidization drying of the scraper conveyor 1 13, the scraper conveyor 2 15, the Z-type scraper conveyor 17 and the bottom of the finished product storage bin 19. The hot air is in full contact with the coal slime during the transportation and storage of the coal slime, taking away water vapor and reducing the moisture content of the coal slime, thereby achieving the effect of drying the coal slime. The fluidization exhaust gas is filtered by the bag dust collector 2 21 and the cyclone dust collector 29 on the top of the finished product storage bin and then discharged into the atmosphere.

[0040] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the present invention. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. Technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A coal slime circulation blending and drying system, including a raw material adding system, characterized in that: It also includes a mixing preparation system and a finished product unloading system; the mixing preparation system includes a coal slurry water feed valve, a mixing preparation box, a coal slurry conveying pump and an intermediate preparation box; an aeration nozzle is arranged in the mixing preparation box; the mixing preparation box inlet is connected to the coal slurry water feed valve; the mixing preparation box outlet is connected to the intermediate preparation box inlet through the coal slurry conveying pump; the finished product unloading system includes an intermediate discharge valve, a Jiaolong mixer, a discharge conveying system, a regeneration mixer, a finished product conveying system, a finished product storage bin, Jiaolong feeders one to three, a finished product discharge valve, a finished product weighing screw machine and a pneumatic conveying device; the intermediate preparation box outlet is connected to the intermediate material inlet of the Jiaolong mixer through the intermediate discharge valve, the Jiaolong mixer outlet is connected to the regeneration mixer inlet through the discharge conveying system, and the regeneration mixer outlet is connected to the finished product storage bin inlet through the finished product conveying system The finished product storage bin is provided with outlet one, outlet two and outlet three; outlet one is connected with the inlet of Jiaolong feeder one, the outlet of Jiaolong feeder one is connected with the inlet of finished product weighing screw machine through the finished product discharge valve, and the outlet of finished product weighing screw machine is connected with the finished product inlet of Jiaolong mixer; outlet two is connected with the inlet of Jiaolong feeder two, the outlet of Jiaolong feeder two is connected with the finished product inlet of mixing preparation box through pneumatic conveying device; outlet three is connected with the inlet of Jiaolong feeder three; the raw material adding system includes a raw material receiving hopper, a bucket elevator, a raw material storage bin, a raw material feed valve and a raw material weighing screw machine; the outlet of the raw material receiving hopper is connected with the inlet of the raw material storage bin through the bucket elevator, the outlet of the raw material storage bin is connected with the inlet of the raw material weighing screw machine through the raw material feed valve, and the outlet of the raw material weighing screw machine is connected with the inlet of the regeneration mixer.

2. The coal slime circulation blending and drying system according to claim 1 is characterized in that: A disc sawtooth agitator, a liquid level meter and a bag dust collector are arranged on the top of the mixing preparation box.

3. The coal slime circulation blending and drying system according to claim 1 is characterized in that: The aeration nozzle comprises a nozzle housing, a fastening hexagon and a threaded pipe; the nozzle housing is fixed to the left end of the fastening hexagon, and the threaded pipe is fixed to the right end of the fastening hexagon; an air flow channel is arranged in the aeration nozzle, and the air flow channel runs through the threaded pipe to the nozzle housing, and the air flow channel is mainly composed of a nozzle inlet, a cavity inlet, a throat-shaped snake cavity, a main body cavity, and an anti-blocking spray hole which are arranged in sequence from right to left.

4. The coal slime circulation blending and drying system according to claim 1 is characterized in that: The unloading conveying system includes a scraper conveyor 1, a rotary feeder and a scraper conveyor 2; the outlet of the Jiaolong mixer is connected to the inlet of the scraper conveyor 1; the outlet of the scraper conveyor 1 is connected to the inlet of the rotary feeder; the outlet of the rotary feeder is connected to the inlet of the scraper conveyor 2; the outlet of the scraper conveyor 2 is connected to the inlet 1 of the regeneration mixer.

5. The coal slime circulation blending and drying system according to claim 4 is characterized in that: The finished product conveying system includes a Z-type scraper and a screw feeder. The outlet of the regeneration mixer is connected to the inlet of the Z-type scraper, the outlet of the Z-type scraper is connected to the inlet of the screw feeder, and the outlet of the screw feeder is connected to the inlet of the finished product storage bin; the finished product storage bin is provided with a bin gasification component; the exhaust port of the finished product storage bin is connected to a cyclone dust collector, and the outlet of the cyclone dust collector is connected to the return material inlet of the Z-type scraper.

6. The coal slime circulation blending and drying system according to claim 1 or 5, characterized in that: A pressure vacuum release valve 1 and a bag dust collector 2 are arranged on the top of the finished product storage bin.

7. The coal slime circulation blending and drying system according to claim 1 is characterized in that: The top of the raw material storage bin is provided with a pressure vacuum release valve 2 and a material level meter, and the bottom of the raw material storage bin is provided with a bin wall vibrator.

8. The coal slime circulation blending and drying system according to claim 1 is characterized in that: It also includes an air-assisted system, which includes an air compressor, an air dryer and an air storage tank; the outlet of the air compressor is connected to the inlet of the air dryer, the outlet of the air dryer is connected to the inlet of the air storage tank, and the outlet of the air storage tank is respectively connected to the air inlet of the pneumatic conveying device and the air inlet of the aeration nozzle.

9. The coal slime circulation blending and drying system according to claim 5, characterized in that: It also includes an air fluidization system, which includes a fluidizing fan, an electric heater, an anti-blocking fluidizing component 1, an anti-blocking fluidizing component 2 and an anti-blocking fluidizing component 3; the outlet of the fluidizing fan is connected to the inlet of the electric heater, and the outlet of the electric heater is divided into four routes, which are respectively connected to the inlet of the anti-blocking fluidizing component 1, the anti-blocking fluidizing component 2, the anti-blocking fluidizing component 3 and the silo gasification component; the outlet of the anti-blocking fluidizing component 1 is connected to the fluidizing air inlet of the scraper conveyor 1; the outlet of the anti-blocking fluidizing component 2 is connected to the fluidizing air inlet of the scraper conveyor 2; the outlet of the anti-blocking fluidizing component 3 is connected to the fluidizing air inlet of the Z-type scraper.

10. A working method of the coal slime circulation blending and drying system according to any one of claims 1 to 9, characterized in that: Here are the steps: (1) The coal slurry water from the coal washing plant is transported to the mixing preparation box through the coal slurry water feed valve for temporary storage; (2) The original coal slurry in the mixing preparation tank is stirred, aerated and mixed with the finished coal slurry from the finished product storage bin, and then transported to the intermediate material preparation tank for temporary storage via the coal slurry delivery pump; (3) The intermediate coal slime in the intermediate material preparation box and the finished coal slime from the finished product storage bin are mixed and crushed by the Jiaolong mixer. The mixed and crushed coal slime enters the regeneration mixer through the unloading conveying system and is mixed with the raw materials from the raw material storage bin. The mixed coal slime is transported to the finished product storage bin through the finished product conveying system for storage and standby use; (4) The finished coal slime from outlet 1 of the finished product storage bin is connected to the Jiaolong mixer to be mixed with the intermediate coal slime. The finished coal slime from outlet 2 is connected to the pneumatic conveying device to be mixed with the original coal slime water in the mixing preparation box for stirring and aeration. The finished coal slime from outlet 3 is loaded on trucks for external transportation. (5) The foreign raw materials are loaded into the raw material receiving hopper and lifted to the raw material storage bin by the bucket elevator for temporary storage; (6) The compressed air of the air-assisted system is divided into two routes and enters the pneumatic conveying device and the mixing preparation box for aeration.

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