Coal slime circulating blending and drying system and working method thereof

Abstract

The present application provides a kind of coal slime circulation blending drying system and its working method, solve the problem of coal slime dehydration drying difficulty.Mixed preparation box is provided with aeration nozzle;Mixed preparation box is connected with coal slime water feed valve and intermediate stock tank;Intermediate stock tank is connected with Jiaolong mixer, Jiaolong mixer is connected with regenerative mixer through discharging conveying system, regenerative mixer is connected with finished product storage bin through finished product conveying system;Finished product storage bin outlet one is connected with Jiaolong feeder one, Jiaolong feeder one is connected with finished product weighing screw machine, finished product weighing screw machine is connected with Jiaolong mixer, outlet two is connected with Jiaolong feeder two, Jiaolong feeder two is connected with mixed preparation box through pneumatic conveying device, outlet three is connected with Jiaolong feeder three;Raw material hopper is connected with raw material storage bin through bucket elevator, raw material storage bin is connected with raw material weighing screw machine through raw material feed valve, raw material weighing screw machine is connected with regenerative mixer.

Description

Technical Field

[0001] This invention relates to a coal slime circulation blending and drying system and its working method, which is mainly applied in the field of coal slime drying, such as coal washing plants and coal slime treatment plants. Background Technology

[0002] Coal slime refers to the semi-solid material formed by the moisture in coal powder. It is an organic mineral resource formed by the long-term compaction and biochemical action of aquatic plant remains in a swamp environment. It is characterized by high moisture content, fine particle size, high particulate content, strong water retention, low calorific value, and high viscosity.

[0003] With increasingly stringent environmental protection requirements and standards, coal slime drying is becoming increasingly difficult. Some coal preparation plants face challenges such as high energy consumption during thermal drying and difficulty in ensuring sufficient moisture content during mechanical dehydration, resulting in the improper disposal of coal slime as waste. This not only harms the environment but also wastes resources. Therefore, the effective disposal of coal slime has become a major problem plaguing the coal industry. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings in the prior art and to provide a reasonably designed coal slime circulation blending and drying system and its working method, which solves the problem of difficult coal slime dewatering and drying.

[0005] The technical solution adopted by this invention to solve the above problems is: a coal slime recycling and drying system, including a raw material addition system, characterized in that: it further includes a mixing and preparation system and a finished product feeding system; the mixing and preparation system includes a coal slime water inlet valve, a mixing and preparation box, a coal slime conveying pump, and an intermediate preparation box; the mixing and preparation box is equipped with aeration nozzles; the inlet of the mixing and preparation box is connected to the coal slime water inlet valve; the outlet of the mixing and preparation box is connected to the inlet of the intermediate preparation box through the coal slime conveying pump; the finished product feeding system includes an intermediate discharge valve, a auger mixer, a feeding conveying system, a regenerated mixer, a finished product conveying system, a finished product storage bin, auger feeders one to three, a finished product discharge valve, a finished product weighing screw conveyor, and a pneumatic conveying device; the outlet of the intermediate preparation box is connected to the intermediate material inlet of the auger mixer through the intermediate discharge valve, and the outlet of the auger mixer is connected to the inlet of the regenerated mixer through the feeding conveying system. The outlet of the raw mixing mill is connected to the inlet of the finished product storage silo via a finished product conveying system. The finished product storage silo is equipped with outlet 1, outlet 2, and outlet 3. Outlet 1 is connected to the inlet of auger feeder 1, and the outlet of auger feeder 1 is connected to the inlet of the finished product weighing screw conveyor via a finished product discharge valve. The outlet of the finished product weighing screw conveyor is connected to the finished product inlet of the auger mixer. Outlet 2 is connected to the inlet of auger feeder 2, and the outlet of auger feeder 2 is connected to the finished product inlet of the mixing preparation box via a pneumatic conveying device. Outlet 3 is connected to the inlet of auger feeder 3. The raw material adding system includes a raw material receiving hopper, a bucket elevator, a raw material storage silo, a raw material feed valve, and a raw material weighing screw conveyor. The outlet of the raw material receiving hopper is connected to the inlet of the raw material storage silo via the bucket elevator. The outlet of the raw material storage silo is connected to the inlet of the raw material weighing screw conveyor via a raw material feed valve. The outlet of the raw material weighing screw conveyor is connected to the inlet of the recycled mixing mill.

[0006] The mixing preparation box of the present invention is equipped with a disc-shaped sawtooth agitator, a level gauge and a bag filter at the top.

[0007] The aeration nozzle of the present invention includes a nozzle housing, a fastening hexagon, and a threaded connector; the nozzle housing is fixed to the left end of the fastening hexagon, and the threaded connector is fixed to the right end of the fastening hexagon; an air flow channel is provided inside the aeration nozzle, which extends from the threaded connector 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 chamber, and an anti-clogging nozzle hole arranged sequentially from right to left.

[0008] The material conveying system of the present invention includes a scraper conveyor 1, a rotary feeder and a scraper conveyor 2; the outlet of the auger mixer is connected to the inlet of scraper conveyor 1; the outlet of scraper conveyor 1 is connected to the inlet of the rotary feeder; the outlet of the rotary feeder is connected to the inlet of scraper conveyor 2; and the outlet of scraper conveyor 2 is connected to the inlet of the recycling mixer 1.

[0009] The finished product conveying system of the present invention includes a Z-type scraper conveyor and a screw feeder. The outlet of the recycled mixer is connected to the inlet of the Z-type scraper conveyor, the outlet of the Z-type scraper conveyor 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 silo. The finished product storage silo is equipped with a silo gasification component. The exhaust port of the finished product storage silo 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 conveyor.

[0010] The finished product storage silo of the present invention is equipped with a pressure vacuum release valve and a bag filter at the top.

[0011] The raw material storage silo of the present invention is equipped with a pressure vacuum release valve and a level gauge at the top, and a silo wall vibrator at the bottom.

[0012] 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 connected to the air inlet of the pneumatic conveying device and the air inlet of the aeration nozzle, respectively.

[0013] The present invention also includes an air fluidization system, which includes a fluidizing fan, an electric heater, and three anti-clogging fluidizing components: anti-clogging fluidizing component one, anti-clogging fluidizing component two, and anti-clogging 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 paths, which are respectively connected to the inlets of anti-clogging fluidizing components one, two, three, and the chamber gasification component. The outlet of anti-clogging fluidizing component one is connected to the fluidizing inlet of scraper conveyor one. The outlet of anti-clogging fluidizing component two is connected to the fluidizing inlet of scraper conveyor two. The outlet of anti-clogging fluidizing component three is connected to the fluidizing inlet of the Z-type scraper conveyor.

[0014] A method for operating a coal slime circulation blending and drying system, characterized by the following steps:

[0015] (1) Coal slurry with a moisture content of 35% and less than 60% from the coal washing plant is transported to the mixing preparation box via the coal slurry feed valve for temporary storage.

[0016] (2) The raw coal slurry water in the mixing preparation box is mixed with the finished coal slurry from the finished product storage bin by stirring and aeration, and then transported to the intermediate preparation box for temporary storage by the coal slurry conveying pump.

[0017] (3) The intermediate coal slime in the intermediate preparation box and the finished coal slime from the finished product storage bin are mixed and crushed by the auger mixer. The mixed and crushed coal slime enters the recycling mixer through the feeding 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 waiting for use.

[0018] (4) The finished coal slurry from outlet one of the finished product storage silo is connected to the auger mixer to mix with the intermediate coal slurry. The finished coal slurry from outlet two is connected to the pneumatic conveying device to mix with the original coal slurry water in the mixing preparation box. The finished coal slurry from outlet three is loaded onto trucks and transported out.

[0019] (5) External raw materials are loaded into the raw material receiving hopper and then lifted by the bucket elevator to the raw material storage bin for temporary storage.

[0020] (6) The compressed air of the air-assisted system is divided into two paths and enters the pneumatic conveying device and the mixing preparation box for aeration.

[0021] Compared with the prior art, the present invention has the following advantages and effects:

[0022] 1) Coal slime can be circulated, blended and dried. During transportation and storage, the coal slime can be fully fluidized and further dried. The final product can be used as power fuel for circulating fluidized bed boilers.

[0023] 2) The system adopts fully automatic cyclic operation, which has good energy-saving benefits;

[0024] 3) The system operates in a fully enclosed manner, and the on-site environment is relatively good. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention.

[0026] Figure 2 for Figure 1 A schematic diagram of the structure of part A.

[0027] Figure 3 for Figure 1 A schematic diagram of the structure of part B.

[0028] Figure 4 for Figure 1 A structural diagram of part C.

[0029] Figure 5 This is a schematic diagram of the front cross-sectional structure of the aeration nozzle in an embodiment of the present invention.

[0030] Figure 6 This is a schematic diagram of the left-hand structure of the aeration nozzle according to an embodiment of the present invention. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0032] I. Embodiments of the present invention include a mixing and preparation system, a finished product feeding system, a raw material adding system, an air-assisted system, and an air fluidization system.

[0033] II. The mixing and preparation system includes a coal slurry water feed valve 1, a mixing and preparation box 2, a disc sawtooth agitator 3, a bag filter 4, a mixing and filtration assembly 5, a flushing and cleaning assembly 6, a coal slurry conveying pump 7, an intermediate material preparation box 8, and a hydraulic slide 9.

[0034] The mixing and preparation chamber 2 has a double-layer hollow box structure. The outer layer is a steel structure, and the inner layer is a filter-type high-molecular polytetrafluoroethylene (PTFE) plate structure. The bottom of the mixing and preparation chamber 2 is equipped with four support feet, each with a metering sensor to record the weight changes of the mixing and preparation chamber 2 in real time. The top of the mixing and preparation chamber 2 is equipped with a disc-shaped sawtooth agitator 3, a level gauge, and a bag filter 4. The mixing and preparation chamber 2 performs three-phase flow mixing and filtration of gas, solid, and liquid, which can greatly improve working efficiency.

[0035] The mixing preparation box 2 has three rings of 36 aeration nozzles 42 arranged around its inner perimeter. Each aeration nozzle 42 includes a nozzle housing 421, a fastening hexagon 422, and a threaded connector 423. The aeration nozzle 42 is bullet-shaped, with the nozzle housing 421 fixed to the left end of the fastening hexagon 422 and the threaded connector 423 fixed to the right end. An airflow channel is provided inside the aeration nozzle 42, extending from the threaded connector 423 to the nozzle housing 421. The airflow channel mainly consists of a nozzle inlet 424, a cavity inlet 425, a throat-shaped cobra cavity 426, a main chamber 427, and anti-clogging nozzles 428, arranged sequentially from right to left. Compressed air enters the cavity inlet 425 from the nozzle inlet 424, is accelerated through the throat-shaped cobra cavity 426, and enters the main chamber 427. Finally, the aeration air flows out along the four evenly distributed anti-clogging nozzles 428, achieving both anti-clogging and aeration functions. The mixing preparation box 2 utilizes disc-type sawtooth stirring and annular aeration to effectively solve problems such as easy sedimentation and clogging in coal slurry water storage.

[0036] The bottom of the mixing preparation tank 2 is connected to a mixing and filtration assembly 5 to promptly remove the filtrate and improve the mixing and drying efficiency. The bottom of the mixing preparation tank 2 is also connected to a rinsing and cleaning assembly 6.

[0037] The inlet of the mixing preparation tank 2 is connected to the coal slurry water feed valve 1; the outlet of the mixing preparation tank 2 is connected to the inlet of the coal slurry conveying pump 7, and the outlet of the coal slurry conveying pump 7 is connected to the inlet of the intermediate material preparation tank 8 via the coal slurry conveying pipeline. The bottom of the intermediate material preparation tank 8 is equipped with a hydraulic slide 9.

[0038] III. The finished product feeding system includes an intermediate discharge valve 10, an intermediate material weighing screw conveyor 11, a auger mixer 12, a scraper conveyor 13, a rotary feeder 14, a scraper conveyor 2 15, a regenerated mixer 16, a Z-type scraper conveyor 17, a screw feeder 18, a finished product storage silo 19, a pressure vacuum release valve 1 20, a bag filter dust collector 2 21, a silo gasification assembly 22, an auger feeder 1 23, a finished product discharge valve 24, a finished product weighing screw conveyor 25, an auger feeder 2 26, a pneumatic conveying device 27, an auger feeder 3 28, and a cyclone dust collector 29.

[0039] 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 conveyor 11; the outlet of the intermediate material weighing screw conveyor 11 is connected to the intermediate material inlet of the auger mixer 12; the outlet of the auger mixer 12 is connected to the inlet of scraper conveyor 13; the outlet of 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 scraper conveyor 15; the outlet of scraper conveyor 15 is connected to the inlet of the recycled mixer 16; the outlet of the recycled mixer 16 is connected to the inlet of the Z-type scraper conveyor 17; the outlet of the Z-type scraper conveyor 17 is connected to the inlet of the screw feeder 18; and the outlet of the screw feeder 18 is connected to the inlet of the finished product storage bin 19.

[0040] The finished product storage bin 19 has three finished product outlets: Outlet 1, Outlet 2, and Outlet 3, used for intermediate material mixing, raw coal slurry water mixing, and finished product loading, respectively. Outlet 1 is connected to the inlet of auger feeder 1 23, the outlet of auger 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 conveyor 25, and the outlet of finished product weighing screw conveyor 25 is connected to the finished material inlet of auger mixer 12. Outlet 2 is connected to the inlet of auger feeder 2 26, the outlet of auger feeder 2 26 is connected to the inlet of pneumatic conveying device 27, and the outlet of pneumatic conveying device 27 is connected to the finished material pneumatic conveying pipeline, which transports the finished material to the finished material inlet of mixing preparation box 2. Outlet 3 is connected to the inlet of auger feeder 3 28, which loads the finished coal slurry for transport.

[0041] The top of the finished product storage silo 19 is equipped with a pressure vacuum release valve 20 and a bag filter 21, while the lower middle part is equipped with a silo gasification assembly 22. The exhaust port of the finished product storage silo 19 is connected to the inlet of the cyclone dust collector 29 to filter the gasified air inside the storage silo, and the outlet of the cyclone dust collector 29 is connected to the return material inlet of the Z-type scraper conveyor 17.

[0042] IV. The raw material addition system includes a raw material receiving hopper 30, a bucket elevator 31, a raw material storage silo 32, a pressure vacuum release valve 33, a silo wall vibrator 34, a raw material feed valve 35, and a raw material weighing screw conveyor 36.

[0043] 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 silo 32. Raw materials enter the bucket elevator 31 through the raw material receiving hopper 30 and are then lifted to the raw material storage silo 32 by the bucket elevator 31. The outlet of the raw material storage silo 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 conveyor 36. The outlet of the raw material weighing screw conveyor 36 is connected to the inlet of the recycled mixing mill 16. A pressure vacuum release valve 33 and a level gauge are installed at the top of the raw material storage silo 32, and a silo wall vibrator 34 is installed at the bottom of the cone-shaped part of the raw material storage silo 32.

[0044] V. 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 equipped 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.

[0045] VI. The air fluidization system includes a fluidizing fan 40, an electric heater 41, an anti-clogging fluidization component one 43, an anti-clogging fluidization component two 44, and an anti-clogging fluidization component three 45.

[0046] The outlet of the fluidizing blower 40 is connected to the inlet of the electric heater 41. The outlet of the electric heater 41 is equipped with a fluidizing air header, and a pressure transmitter and a local pressure gauge are installed on the fluidizing air header to monitor the fluidizing air pressure. The outlet of the electric heater 41 is divided into four paths, which are respectively connected to the inlets of the anti-clogging fluidizing assembly 1 43, the anti-clogging fluidizing assembly 2 44, the anti-clogging fluidizing assembly 3 45, and the chamber gasification assembly 22. The outlet of the anti-clogging fluidizing assembly 1 43 is connected to the fluidizing air inlet of the scraper conveyor 13. The outlet of the anti-clogging fluidizing assembly 2 44 is connected to the fluidizing air inlet of the scraper conveyor 2 15. The outlet of the anti-clogging fluidizing assembly 3 45 is connected to the fluidizing air inlet of the Z-type scraper conveyor 17.

[0047] VII. The working method of the coal slime circulation blending and drying system of the present invention comprises the following steps:

[0048] (1) Coal slurry with a moisture content of 35% and less than 60% from the coal washing plant is transported to the mixing and preparation box 2 via coal slurry feed valve 1 for temporary storage.

[0049] (2) The original coal slurry water in the mixing preparation box 2 and the finished coal slurry from the finished product storage bin 19 are stirred, aerated and mixed, and the coal slurry prepared by filtration is transported to the intermediate preparation box 8 by the coal slurry conveying pump 7 for temporary storage.

[0050] (3) The intermediate coal slime in the intermediate preparation box 8 and the finished coal slime from the finished product storage bin 19 are mixed and crushed by the auger mixer 12. The mixed and crushed coal slime is conveyed by the scraper conveyor 13, fed by the rotary feeder 14 and then enters the recycling mixer 16 to be mixed with the raw materials from the raw material storage bin 32. The mixed coal slime is conveyed by the Z-type scraper conveyor 17 and the screw feeder 18 to the finished product storage bin 19 for storage and use.

[0051] (4) The finished coal slurry from outlet one of the finished product storage bin 19 is connected to the auger mixer 12 to mix with the intermediate coal slurry. The finished coal slurry from outlet two is connected to the pneumatic conveying device 27 to mix with the original coal slurry water in the mixing preparation box 2. The finished coal slurry from outlet three is loaded onto trucks and transported out.

[0052] (5) The incoming raw materials are unloaded and loaded into the raw material receiving hopper 30, and then lifted by the bucket elevator 31 to the raw material storage bin 32 for temporary storage.

[0053] (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 exhaust gas of the air-assisted system is filtered by the bag dust collector 4 on the top of the mixing preparation box and then discharged into the atmosphere.

[0054] (7) After being heated by electric heater 41, the fluidizing air of the air fluidization system is divided into three paths to perform air fluidization drying on the bottom of scraper conveyor 13, scraper conveyor 25, Z-type scraper conveyor 17 and finished product storage bin 19 respectively. The hot air fully contacts the coal slime during the conveying and storage process, removes water vapor and reduces the moisture content of the coal slime, thereby achieving the effect of coal slime drying. The fluidization tail gas is filtered by bag filter 21 and cyclone dust collector 29 at the top of the finished product storage bin before being discharged into the atmosphere.

[0055] Furthermore, it should be noted that the specific embodiments described in this specification may differ in the shape and name of their components, etc. The above description is merely illustrative of the structure of the present invention. All equivalent or simple variations made based on the structure, features, and principles described in this patent concept are included within the protection scope of this patent. Those skilled in the art can make various modifications or additions to the described specific embodiments or use similar methods to substitute them, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, all of which should fall within the protection scope of this invention.

Claims

1. A coal slurry recirculation blending and drying system comprising a feedstock addition system, characterized by: The application also relates to a mixing preparation system and a finished product discharging system; the mixing preparation system comprises a slime water feeding valve, a mixing preparation box, a slime conveying pump and an intermediate material preparation box; the mixing preparation box is internally provided with an aeration nozzle; the mixing preparation box inlet is connected with the slime water feeding valve; the mixing preparation box outlet is connected with the intermediate material preparation box inlet through the slime conveying pump; the finished product discharging system comprises an intermediate discharging valve, a Longji mixer, a discharging conveying system, a regenerative mixing machine, a finished product conveying system, a finished product storage bin, a Longji feeder one, a Longji feeder two, a Longji feeder three, a finished product discharging valve, a finished product weighing screw machine and a pneumatic conveying device; the intermediate material preparation box outlet is connected with the intermediate material inlet of the Longji mixer through the intermediate discharging valve; the Longji mixer outlet is connected with the regenerative mixing machine inlet through the discharging conveying system; the regenerative mixing machine outlet is connected with the finished product storage bin inlet through the finished product conveying system; the finished product storage bin is provided with an outlet one, an outlet two and an outlet three; the outlet one is connected with the Longji feeder one inlet; the Longji feeder one outlet is connected with the finished product weighing screw machine inlet through the finished product discharging valve; the finished product weighing screw machine outlet is connected with the finished product material inlet of the Longji mixer; the outlet two is connected with the Longji feeder two inlet; the Longji feeder two outlet is connected with the finished product material inlet of the mixing preparation box through the pneumatic conveying device; the outlet three is connected with the Longji feeder three inlet; the raw material adding system comprises a raw material receiving hopper, a bucket elevator, a raw material storage bin, a raw material feeding valve and a raw material weighing screw machine; the raw material receiving hopper outlet is connected with the raw material storage bin inlet through the bucket elevator; the raw material storage bin outlet is connected with the raw material weighing screw machine inlet through the raw material feeding valve; the raw material weighing screw machine outlet is connected with the regenerative mixing machine inlet; the raw material is external raw material; the discharging conveying system comprises a scraper conveyor one, a rotary feeder and a scraper conveyor two; the Longji mixer outlet is connected with the scraper conveyor one inlet; the scraper conveyor one outlet is connected with the rotary feeder inlet; the rotary feeder outlet is connected with the scraper conveyor two inlet; the scraper conveyor two outlet is connected with the regenerative mixing machine inlet; the finished product conveying system comprises a Z-shaped scraper machine and a screw feeder; the regenerative mixing machine outlet is connected with the Z-shaped scraper machine inlet; the Z-shaped scraper machine outlet is connected with the screw feeder inlet; the screw feeder outlet is connected with the finished product storage bin inlet; the finished product storage bin is provided with a bin gasification assembly; the finished product storage bin exhaust port is connected with a cyclone dust collector; the cyclone dust collector outlet is connected with the Z-shaped scraper machine back material inlet; the application also comprises an air assisting system; the air assisting system comprises an air compressor, an air dryer and an air storage tank; the air compressor outlet is connected with the air dryer inlet; the air dryer outlet is connected with the air storage tank inlet; the air storage tank outlet is connected with the pneumatic conveying device air inlet and the aeration nozzle air inlet respectively; the application also comprises an air fluidization system; the air fluidization system comprises a fluidization fan, an electric heater, a first anti-blocking fluidization assembly, a second anti-blocking fluidization assembly and a third anti-blocking fluidization assembly.The outlet of the fluidizing fan is connected with the inlet of the electric heater, the outlet of the electric heater is divided into four paths, and is respectively connected with the inlets of the anti-blocking fluidizing assembly one, the anti-blocking fluidizing assembly two, the anti-blocking fluidizing assembly three and the warehouse body gasification assembly; the outlet of the anti-blocking fluidizing assembly one is connected with the fluidizing air inlet of the scraper conveyor one; the outlet of the anti-blocking fluidizing assembly two is connected with the fluidizing air inlet of the scraper conveyor two; the outlet of the anti-blocking fluidizing assembly three is connected with the fluidizing air inlet of the Z-shaped scraper machine.

2. The coal slurry recirculating blending and drying system of claim 1, wherein: The top of the mixing preparation box is provided with a disc sawtooth stirrer, a liquid level meter and a cloth bag dust collector.

3. The coal slurry recirculation blending and drying system of claim 1, wherein: The aeration nozzle comprises a nozzle shell, a fastening hex and a threaded connecting pipe; the nozzle shell is fixed to the left end of the fastening hex, and the threaded connecting pipe is fixed to the right end of the fastening hex; an air flow channel is arranged in the aeration nozzle and penetrates from the threaded connecting pipe to the nozzle shell; the air flow channel mainly comprises a nozzle inlet, a cavity inlet, a throat-shaped snake tube cavity, a main cavity and a blockage prevention nozzle hole arranged in sequence from right to left.

4. The coal slurry recirculation blending and drying system of claim 1, wherein: The top of the finished product storage bin is provided with a pressure vacuum release valve one and a cloth bag dust collector two.

5. The coal slurry recirculation blending and drying system of claim 1, wherein: The top of the raw material storage bin is provided with a pressure vacuum release valve two and a material level meter, and the bottom of the raw material storage bin is provided with a bin wall vibrator.

6. A method of operating a coal slurry recirculation blending and drying system as claimed in any one of claims 1 to 5, characterised by: The steps are as follows: (1) the coal slurry water from the coal washing plant is transported to the mixing preparation box through the coal slurry water feeding valve for temporary storage; (2) the original coal slurry in the mixing preparation box is mixed with the finished product coal slurry from the finished product storage bin, and then is transported to the intermediate material preparation box through the coal slurry conveying pump for temporary storage; (3) the intermediate coal slurry in the intermediate material preparation box is mixed with the finished product coal slurry from the finished product storage bin through the Jiaolong mixer, and then is conveyed into the regeneration mixer through the discharging conveying system, mixed with the raw material from the raw material storage bin, and then is conveyed to the finished product storage bin through the finished product conveying system for storage; (4) the finished product coal slurry from the outlet one of the finished product storage bin is connected to the Jiaolong mixer to mix with the intermediate coal slurry, the finished product coal slurry from the outlet two is connected to the pneumatic conveying device to mix with the original coal slurry in the mixing preparation box, and the finished product coal slurry from the outlet three is loaded into a vehicle for external transportation; (5) the external raw material is loaded into the raw material receiving hopper, is lifted to the raw material storage bin through the bucket elevator for temporary storage; (6) the compressed air of the air assisting system is divided into two paths and is respectively introduced into the pneumatic conveying device and the mixing preparation box for aeration.

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