CN113637492B - Processing device of lignite for drilling fluid and preparation method thereof - Google Patents

Abstract

The invention discloses a processing device and a preparation method of lignite for drilling fluid, wherein the processing device comprises a screening box and a stirring box, a material outlet belt is arranged at the bottom end of the screening box, the stirring box is arranged at the upper end of the screening box and is communicated with the screening box, a feeding bin is arranged at one side of the stirring box, a feeding belt is arranged at the upper port of the feeding bin, the lower port of the feeding bin corresponds to a crushing mechanism arranged in the stirring box, and the processing device further comprises a multi-stage material sieve plate, a circulating feeding mechanism and an air blast heating mechanism; this processingequipment collects comminuted, dries, sieves as an organic whole, and work efficiency is high-efficient, and the blast air heating mechanism is installed outward to processingequipment in addition, can dry the moisture to the material from inside and outside two sides to can flow through wind-force, take away small brown coal granule in the processingequipment, carry out the dust fall and collect, guarantee that the moisture can obtain fully drying on the brown coal after the processing, and make the brown coal granule keep in suitable specification, improve pyrolytic reaction ware machining efficiency and production quality.

Description

Processing device of lignite for drilling fluid and preparation method thereof

Technical Field

The invention relates to the technical field of lignite processing, in particular to a processing device of lignite for drilling fluid and a preparation method thereof.

Background

The drilling fluid is the blood of the well, also called drilling flushing fluid. The drilling fluid can be divided into clear water, slurry, clay-phase-free flushing fluid, emulsion, foam, compressed air, kerosene and the like according to the components. Currently, in a kerosene extraction process for drilling fluid lignite, extraction is generally performed through a low-temperature dry distillation process. Patent No. CN103666508A discloses a low-temperature dry distillation pyrolysis process for low-rank coal, which utilizes a multi-stage furnace which is transformed as a dry distillation device, uses gas obtained after oil extraction in the pyrolysis of low-rank coal materials as a circulating heat carrier, and performs drying preheating, dry distillation pyrolysis on the low-rank coal, extracts tar and produces semicoke.

Before processing lignite, need smash the lignite raw materials, the moisture is dried in smashing the material simultaneously, on the reducing mechanism of lignite processing, often install the sieve, make lignite keep suitable specification size, in order to improve dry distillation pyrolysis efficiency, traditional processingequipment is smashing and screening the lignite granule after, the large granule material of sieving out often remains in the box, need to spend a large amount of time to remove the clearance, it is hard to take trouble, and can remain a large amount of powder on the granule after smashing, these powders fly away in the pipeline, can pollute the operation environment, in addition after the heating, the adhesion causes the mouth of pipe to block up on the pipe wall very easily and with, influence machining efficiency. In this regard, improvements are needed.

Disclosure of Invention

The invention aims to provide a processing device of lignite for drilling fluid and a preparation method thereof, so as to solve the problems in the background technology.

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

the processing device of the lignite for the drilling fluid comprises a screening box and a stirring box, wherein a discharge belt is arranged at the bottom end of the screening box, the stirring box is arranged at the upper end of the screening box and is communicated with the screening box, a feeding bin is arranged on one side of the stirring box, a feeding belt is arranged at an upper port of the feeding bin, a lower port of the feeding bin corresponds to a crushing mechanism arranged in the stirring box, and the processing device further comprises a multi-stage material sieve plate, a circulating feeding mechanism and a blast heating mechanism;

the multi-stage material sieve plate is arranged in the screening box, is connected with the crushing mechanism through the rotating shaft transmission mechanism and is used for screening materials for multiple times, a screening bin is arranged on one side of the multi-stage material sieve plate in the screening box, and one end of the multi-stage material sieve plate extends into the screening bin;

the circulating feeding mechanism is arranged on one side of the main motor, the input end of the circulating feeding mechanism is communicated with the screening bin, and the output end of the circulating feeding mechanism is communicated with the feeding bin;

the blast heating mechanism comprises a first air pipe fitting and a second air pipe fitting, the first air pipe fitting is arranged on one side of the screening box and communicated with the screening box, the second air pipe fitting is arranged on one side of the stirring box and communicated with the stirring box, and the first air pipe fitting and the second air pipe fitting are communicated through a heating ring cavity arranged in the end walls of the stirring box and the screening box.

Preferably, the first air pipe piece comprises a first air box arranged on one side of the main motor, an air inlet pipe is connected to the first air box and is communicated with a plurality of first air pipes and second air pipes arranged on two sides of the first air box, one end, far away from the air inlet pipe, of the first air pipe is communicated with an air blowing cover opening arranged in the screening box, and one end, far away from the air inlet pipe, of the second air pipe is communicated with the heating ring cavity;

preferably, the second air pipe piece comprises a second air box arranged on the other side of the main motor, a dust collecting pipeline is connected to the second air box and communicated with a plurality of third air pipes and fourth air pipes arranged on two sides of the second air box, one end of the third air pipe is far away from the dust collecting pipeline and communicated with a dust collecting cover opening arranged in the stirring box, and one end of the fourth air pipe is far away from the dust collecting pipeline and communicated with the heating ring cavity.

Preferably, a filter cavity is formed in the second air box and communicated with the dust collecting pipeline, a filter screen plate is arranged in the filter cavity, and the filter screen plate is detachably connected with the second air box.

Preferably, the heating ring cavity comprises a first cavity and a second cavity, the first cavity surrounds in the end wall of the screening box and is communicated with the second air pipe, the second cavity surrounds in the end wall of the stirring box and is communicated with the first cavity, and one end, far away from the first cavity, of the second cavity is communicated with the third air pipe.

Preferably, rubbing crusher constructs including wearing to establish the (mixing) shaft in the agitator tank, and the (mixing) shaft top is connected with the main motor output who establishes in the agitator tank upper end, and the (mixing) shaft pole is equipped with a plurality of crushing blades on one's body, and a plurality of crushing blade are fixed around outside the (mixing) shaft and are cascaded setting.

Preferably, multistage material sieve includes first sieve and establishes the second sieve in first sieve below, and first sieve and second sieve one end penetrate in the screening storehouse and with establish the spring part in the screening storehouse and be connected, the first sieve and the second sieve other end are connected with the mounting panel of establishing at the screening incasement through the spring part, and the mating holes has been seted up to first sieve center department, and the mating grooves has been seted up to second sieve center department, and mating holes and mating grooves cooperate with pivot drive mechanism.

Preferably, pivot drive mechanism is including establishing the connecting axle at the screening incasement, connecting axle top and (mixing) shaft lower extreme fixed connection, and the connecting axle bottom is passed the mating holes and is extended to the cooperation inslot, connecting axle and mating holes and cooperation groove clearance fit, and the mating holes pole is equipped with protruding type arris outward, protruding type arris and the protruding clearance fit of establishing in mating holes and cooperation groove.

Preferably, circulation feed mechanism is including establishing the feeding bin in screening case one side, feeding bin and screening storehouse cavity intercommunication, are equipped with the spiral auger of perpendicular setting on the feeding bin, and spiral auger output is linked together with the feeding bin.

The preparation method of the lignite for the drilling fluid comprises the following steps:

step one, adopting a processing device of lignite for drilling fluid to crush lignite into particles with the size of 7-8mm, putting the pulverized lignite into a feeder, heating the pulverized lignite in the process, and drying the moisture in the lignite again;

step two, putting the dried lignite particles into a pyrolysis reactor, heating to 500 ℃ and 600 ℃, and carrying out pyrolysis;

step three, dividing a semicoke mixture generated by pyrolysis into two parts, wherein one part enters a lifting pipe, and enters a cyclone separator after being heated to the temperature of 700-850 ℃ to separate flue gas and hot semicoke, the separated semicoke mixture enters a pyrolysis reactor for dry distillation, and the flue gas is utilized by a waste heat recovery device;

and step four, the other part of the semicoke mixture enters a lifting pipe, is heated to the temperature of 700-850 ℃, enters a cyclone separator, is used for separating the smoke and the hot semicoke, enters a cyclone condenser for cooling after the smoke is filtered at the temperature of 400 ℃, is secondarily cooled to the temperature of 70-90 ℃ by a heat exchanger, and the generated kerosene and coal gas are respectively discharged through two pipelines.

Compared with the prior art, the invention has the beneficial effects that: this processingequipment collects comminuted, dries, sieves as an organic whole, and work efficiency is high-efficient, and the blast air heating mechanism is installed outward to processingequipment in addition, can dry the moisture to the material from inside and outside two sides to can flow through wind-force, take away small brown coal granule in the processingequipment, carry out the dust fall and collect, guarantee that the moisture can obtain fully drying on the brown coal after the processing, and make the brown coal granule keep in suitable specification, improve pyrolytic reaction ware machining efficiency and production quality.

Drawings

Fig. 1 is a schematic structural diagram of a processing device of lignite for drilling fluid and a preparation method thereof.

Fig. 2 is a schematic structural diagram of a discharging belt in the processing device for lignite for drilling fluid.

Fig. 3 is a schematic structural diagram of a screening bin in the lignite processing device for the drilling fluid.

Fig. 4 is a schematic structural diagram of a connecting shaft in the processing device for lignite for drilling fluid.

Fig. 5 is a schematic structural diagram of a first sieve plate in the lignite processing device for the drilling fluid.

Fig. 6 is a schematic structural diagram of a second sieve plate in the lignite processing device for the drilling fluid.

In the figure: 1. a main motor; 2. a stirring box; 3. a feed belt; 4. a feeding bin; 5. a spiral auger; 6. a feeding bin; 7. a screening box; 8. a first windbox; 9. a first air duct; 10. a second air duct; 11. an air inlet pipe; 12. discharging the material belt; 13. a connecting shaft; 14. a second windbox; 15. a filter screen plate; 16. a third air duct; 17. a fourth air duct; 18. crushing the leaves; 19. a stirring shaft; 20. a first lumen; 21. a second lumen; 22. a screening bin; 23. a first screen deck; 24. a second screen deck; 25. an air blast cover opening; 26. mounting a plate; 27. a mating hole; 28. a mating groove; 29. a convex edge; 30. a dust collection cover opening.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

Referring to fig. 1-6, in the embodiment of the present invention, the lignite processing device for a drilling fluid includes a screening box 7 and a stirring box 2, a discharge belt 12 is disposed at a bottom end of the screening box 7, the stirring box 2 is disposed at an upper end of the screening box 7 and is communicated with the screening box 7, a feeding bin 4 is disposed at one side of the stirring box 2, a feeding belt 3 is disposed at an upper port of the feeding bin 4, a lower port of the feeding bin 4 corresponds to a crushing mechanism disposed in the stirring box 2, and the lignite processing device further includes a multi-stage material sieve plate, a circulating feeding mechanism and an air blowing heating mechanism;

the multi-stage material sieve plate is arranged in the screening box 7, is connected with the crushing mechanism through a rotating shaft transmission mechanism and is used for screening the materials for multiple times, a screening bin 22 is arranged on one side of the multi-stage material sieve plate in the screening box 7, and one end of the multi-stage material sieve plate extends into the screening bin 22;

the circulating feeding mechanism is arranged on one side of the main motor 1, the input end of the circulating feeding mechanism is communicated with the screening bin 22, and the output end of the circulating feeding mechanism is communicated with the feeding bin 4; rubbing crusher constructs through pivot drive mechanism drive multistage material sieve work, the material gets into agitator tank 2 through feeding storehouse 4 in, rubbing crusher constructs through rotating to be smashed the brown coal caking, the brown coal after smashing gets into in screening case 7, under the work of multistage material sieve, the material that accords with the particle size falls into out the material area 12 and carries, the material that does not accord with the particle size falls into screening storehouse 22 in, the material gets into circulation feed mechanism through screening storehouse 22 again in, get back to feeding storehouse 4 again and smash.

The blast heating mechanism comprises a first air pipe fitting and a second air pipe fitting, the first air pipe fitting is arranged on one side of the screening box 7 and communicated with the screening box 7, the second air pipe fitting is arranged on one side of the stirring box 2 and communicated with the stirring box 2, and the first air pipe fitting and the second air pipe fitting are communicated through heating annular cavities formed in the end walls of the stirring box 2 and the screening box 7; in the hot gas flow that the pyrolysis cauldron produced passed through waste heat recovery device and got into first wind pipe fitting, negative pressure dust collecting equipment was then connected to the second wind pipe fitting, and first wind pipe fitting carries out work with second wind pipe fitting, makes to produce updraft in screening case 7 and the agitator tank 2 and to agitator tank 2 and the heating of screening case 7 end wall, when drying moisture in the material, through wind-force flow, takes out small brown coal granule, dust fall and classified collection.

The first air pipe piece comprises a first air box 8 arranged on one side of the main motor 1, an air inlet pipe 11 is connected to the first air box 8, the air inlet pipe 11 is communicated with a plurality of first air pipes 9 and second air pipes 10 arranged on two sides of the first air box 8, one end, far away from the air inlet pipe 11, of each first air pipe 9 is communicated with an air blowing cover opening 25 arranged in the screening box 7, and one end, far away from the air inlet pipe 11, of each second air pipe 10 is communicated with the heating ring cavity; hot air flow generated by the pyrolysis kettle enters an air inlet pipe 11 through a waste heat recovery device, the air inlet pipe 11 injects the hot air flow into the screening box 7 through a first air pipe 9, and injects the hot air flow into the heating ring cavity through a second air pipe 10;

The second air pipe piece comprises a second air box 14 arranged on the other side of the main motor 1, a dust collecting pipeline is connected to the second air box 14 and is communicated with a plurality of third air pipes 16 and fourth air pipes 17 arranged on the two sides of the second air box 14, one end of each third air pipe 16, far away from the dust collecting pipeline, is communicated with a dust collecting cover opening 30 arranged in the stirring box 2, and one end of each fourth air pipe 17, far away from the dust collecting pipeline, is communicated with the heating ring cavity; the dust collecting pipeline is connected with negative pressure dust collecting equipment, hot air in the screening box 7 and the stirring box 2 is extracted through the third air pipe 16, and the small powder in the stirring box 2 and the screening box 7 is collected through air flow, meanwhile, hot air flows in the heating ring cavity through the fourth air pipe 17, the lignite is dried from the inner side and the outer side of the processing device, and heat transfer is uniform.

A filter cavity is formed in the second air box 14 and is communicated with a dust collecting pipeline, a filter screen plate 15 is arranged in the filter cavity, and the filter screen plate 15 is detachably connected with the second air box 14; filter screen board 15 is used for carrying out the separation to the rubbing crusher structure during operation, and the mode of connection can be dismantled to the large granule powder of production, and easily the staff changes the maintenance.

The heating ring cavity comprises a first cavity 20 and a second cavity 21, the first cavity 20 surrounds the end wall of the screening box 7 and is communicated with the second air pipe 10, the second cavity 21 surrounds the end wall of the stirring box 2 and is communicated with the first cavity 20, and one end, far away from the first cavity 20, of the second cavity 21 is communicated with the third air pipe 16.

The crushing mechanism comprises a stirring shaft 19 which is arranged in the stirring box 2 in a penetrating way, the top end of the stirring shaft 19 is connected with the output end of the main motor 1 which is arranged at the upper end of the stirring box 2, a plurality of crushing blades 18 are arranged on the shaft body of the stirring shaft 19, and the plurality of crushing blades 18 are fixedly wound outside the stirring shaft 19 and are arranged in a stepped way; the crushing blades 18 surround the stirring shaft 19 and are fixedly connected with the stirring shaft 19, and the crushing blades 18 arranged in a stepped manner are matched with the conical cavity in the stirring box 2, so that the caking crushing effect of the lignite can be improved;

the multistage material sieve plate comprises a first sieve plate 23 and a second sieve plate 24 arranged below the first sieve plate 23, one ends of the first sieve plate 23 and the second sieve plate 24 penetrate into the screening bin 22 and are connected with a spring part arranged in the screening bin 22, the other ends of the first sieve plate 23 and the second sieve plate 24 are connected with a mounting plate 26 arranged in the screening box 7 through the spring part, a matching hole 27 is formed in the center of the first sieve plate 23, a matching groove 28 is formed in the center of the second sieve plate 24, and the matching hole 27 and the matching groove 28 are matched with the rotating shaft transmission mechanism; the matching hole 27 is a through hole, and the matching groove 28 is a deep groove for ensuring that the material cannot leak from the gap between the matching hole 27 and the connecting shaft 13.

The rotating shaft transmission mechanism comprises a connecting shaft 13 arranged in the screening box 7, the top end of the connecting shaft 13 is fixedly connected with the lower end of the stirring shaft 19, the bottom end of the connecting shaft 13 penetrates through a matching hole 27 and extends into a matching groove 28, the connecting shaft 13 is movably matched with the matching hole 27 and the matching groove 28, a convex edge 29 is arranged outside the matching hole 27, and the convex edge 29 is movably matched with protrusions arranged in the matching hole 27 and the matching groove 28; first sieve 23 and second sieve 24 erect and are being filtered between storehouse 22 and mounting panel 26, float through spring part and screening storehouse 22 and first sieve 23 and be connected, the window has been seted up with the junction of first sieve 23 and second sieve 24 in screening storehouse 22, the material is after the screening, the brown coal that stops on first sieve 23 and second sieve 24 can be shaken into and is collected in the window on the screening storehouse 22 through shaking, in operation, main motor 1 drives (mixing) shaft 19 and rotates, connecting shaft 13 synchronous rotation is driven in the rotation to (mixing) shaft 19, connecting shaft 13 is protruding contact repeatedly in protruding arris 29 and mating holes 27 and the mating grooves 28 when rotating, thereby control first sieve 23 and second sieve 24 and do reciprocal rocking from side to side, sieve the material.

The circular feeding mechanism comprises a feeding bin 6 arranged on one side of the screening box 7, the feeding bin 6 is communicated with a cavity of the screening bin 22, a spiral auger 5 vertically arranged is arranged on the feeding bin 6, and the output end of the spiral auger 5 is communicated with the feeding bin 4; the inner wall of the screening bin 22 is inclined, materials falling into the screening bin 22 can directly enter the feeding bin 6, then the materials are lifted to the feeding bin 4 under the work of the spiral auger 5, and the materials are fed again and crushed until the materials reach the proper particle size.

The preparation method of the lignite for the drilling fluid comprises the following steps: crushing lignite into particles with the size of 7-8mm by adopting a processing device of lignite for drilling fluid, putting the lignite particles into a feeder and heating the lignite particles in the process, drying the moisture in the lignite again, putting the dried lignite particles into a pyrolysis reactor, heating the lignite particles to 500-, the produced kerosene and coal gas are respectively discharged through two pipelines.

The working principle is as follows: the grinding mechanism drives the multistage material sieve plate to work through the rotating shaft transmission mechanism, the materials enter the stirring box 2 through the feeding bin 4, the grinding mechanism grinds brown coal agglomerates through rotation, the ground brown coal enters the screening box 7, under the work of the multistage material sieve plate, the materials which accord with particle sizes fall into the discharging belt 12 to be conveyed, the materials which do not accord with the particle sizes fall into the screening bin 22, the materials enter the circulating feeding mechanism through the screening bin 22 again and return to the feeding bin 4 to be ground, hot air generated by the pyrolysis kettle enters the first air pipe fitting through the waste heat recovery device, the second air pipe fitting is connected with the negative pressure dust collecting equipment, the first air pipe fitting and the second air pipe fitting work to generate updraft in the screening box 7 and the stirring box 2 and heat the end walls of the stirring box 2 and the screening box 7, and when water in the materials is dried, the materials flow through wind power, the micro lignite particles are pumped away for dust fall and classified collection, so that the moisture on the processed lignite can be fully dried, the lignite particles are kept at the size of 7-8mm, and the processing efficiency and the production quality of the pyrolysis reactor are improved.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof.

Claims (8)

1. The processing device of the lignite for the drilling fluid comprises a screening box (7) and a stirring box (2), wherein a material outlet belt (12) is arranged at the bottom end of the screening box (7), the stirring box (2) is arranged at the upper end of the screening box (7) and is communicated with the screening box (7), a feeding bin (4) is arranged on one side of the stirring box (2), a feeding belt (3) is arranged at an upper port of the feeding bin (4), and a lower port of the feeding bin (4) corresponds to a crushing mechanism arranged in the stirring box (2), and the processing device is characterized by further comprising a multi-stage material sieve plate, a circulating feeding mechanism and an air blowing heating mechanism;

the multi-stage material sieve plate is arranged in the screening box (7), is connected with the crushing mechanism through a rotating shaft transmission mechanism and is used for screening materials for multiple times, a screening bin (22) is arranged on one side, located on the multi-stage material sieve plate, in the screening box (7), and one end of the multi-stage material sieve plate extends into the screening bin (22);

the multistage material sieve plate comprises a first sieve plate (23) and a second sieve plate (24) arranged below the first sieve plate (23), one ends of the first sieve plate (23) and the second sieve plate (24) penetrate into the screening bin (22) and are connected with a spring piece arranged in the screening bin (22), the other ends of the first sieve plate (23) and the second sieve plate (24) are connected with a mounting plate (26) arranged in the screening box (7) through the spring piece, a matching hole (27) is formed in the center of the first sieve plate (23), a matching groove (28) is formed in the center of the second sieve plate (24), and the matching hole (27) and the matching groove (28) are matched with the rotating shaft transmission mechanism;

The rotating shaft transmission mechanism comprises a connecting shaft (13) arranged in the screening box (7), the top end of the connecting shaft (13) is fixedly connected with the lower end of the stirring shaft (19), the bottom end of the connecting shaft (13) penetrates through a matching hole (27) and extends into a matching groove (28), the connecting shaft (13) is movably matched with the matching hole (27) and the matching groove (28), a convex edge (29) is arranged outside the rod body of the matching hole (27), and the convex edge (29) is movably matched with a bulge arranged in the matching hole (27) and the matching groove (28);

the circulating feeding mechanism is arranged on one side of the main motor (1), the input end of the circulating feeding mechanism is communicated with the screening bin (22), and the output end of the circulating feeding mechanism is communicated with the feeding bin (4);

the blast heating mechanism comprises a first air pipe fitting and a second air pipe fitting, the first air pipe fitting is arranged on one side of the screening box (7) and communicated with the screening box (7), the second air pipe fitting is arranged on one side of the stirring box (2) and communicated with the stirring box (2), and the first air pipe fitting and the second air pipe fitting are communicated through a heating ring cavity arranged in the end walls of the stirring box (2) and the screening box (7).

2. The processing device of lignite for drilling fluid as claimed in claim 1, wherein the first air pipe member comprises a first air box (8) arranged on one side of a main motor (1), an air inlet pipe (11) is connected to the first air box (8), the air inlet pipe (11) is communicated with a plurality of first air pipes (9) and second air pipes (10) arranged on two sides of the first air box (8), one end of the first air pipe (9) far away from the air inlet pipe (11) is communicated with an air blowing cover opening (25) arranged in the screening box (7), and one end of the second air pipe (10) far away from the air inlet pipe (11) is communicated with the heating ring cavity.

3. The processing device of lignite for drilling fluid as claimed in claim 2, wherein the second air duct comprises a second air box (14) arranged on the other side of the main motor (1), a dust collecting pipeline is connected to the second air box (14), the dust collecting pipeline is communicated with a plurality of third air ducts (16) and fourth air ducts (17) arranged on two sides of the second air box (14), one end of the third air duct (16) far away from the dust collecting pipeline is communicated with a dust collecting cover opening arranged in the stirring box (2), and one end of the fourth air duct (17) far away from the dust collecting pipeline is communicated with the heating ring cavity.

4. The lignite processing device according to claim 3, wherein a filter cavity is formed in the second air box (14), the filter cavity is communicated with a dust collecting pipeline, a filter screen plate (15) is arranged in the filter cavity, and the filter screen plate (15) is detachably connected with the second air box (14).

5. The lignite processing device for the drilling fluid as claimed in claim 3, wherein the heating ring cavity comprises a first cavity (20) and a second cavity (21), the first cavity (20) is encircled in the end wall of the screening box (7) and communicated with the second air pipe (10), the second cavity (21) is encircled in the end wall of the stirring box (2) and communicated with the first cavity (20), and one end, far away from the first cavity (20), of the second cavity (21) is communicated with the third air pipe (16).

6. The processing device of lignite for drilling fluid, as claimed in claim 1, wherein the crushing mechanism comprises a stirring shaft (19) arranged in the stirring box (2) in a penetrating manner, the top end of the stirring shaft (19) is connected with the output end of a main motor (1) arranged at the upper end of the stirring box (2), a plurality of crushing blades (18) are arranged on the shaft of the stirring shaft (19), and the plurality of crushing blades (18) are fixedly wound outside the stirring shaft (19) and are arranged in a stepped manner.

7. The lignite processing device for the drilling fluid as claimed in claim 1, wherein the circulating feeding mechanism comprises a feeding bin (6) arranged on one side of the screening box (7), the feeding bin (6) is communicated with a chamber of the screening bin (22), a vertically arranged spiral auger (5) is arranged on the feeding bin (6), and an output end of the spiral auger (5) is communicated with the feeding bin (4).

8. The preparation method of the lignite for the drilling fluid is characterized by comprising the following steps of:

step one, adopting the processing device of lignite for drilling fluid as claimed in claim 1 to crush lignite into particles with the size of 7-8mm, putting the pulverized lignite into a feeder, heating the pulverized lignite in the process, and drying the moisture in the lignite again;

step two, putting the dried lignite particles into a pyrolysis reactor, heating to the temperature of 500-;

Step three, dividing a semicoke mixture generated by pyrolysis into two parts, wherein one part enters a lifting pipe, and enters a cyclone separator after being heated to the temperature of 700-850 ℃ to separate flue gas and hot semicoke, the separated semicoke mixture enters a pyrolysis reactor for dry distillation, and the flue gas is utilized by a waste heat recovery device;

and step four, the other part of the semicoke mixture enters a lifting pipe, is heated to the temperature of 700-850 ℃, enters a cyclone separator, is used for separating the smoke and the hot semicoke, enters a cyclone condenser for cooling after the smoke is filtered at the temperature of 400 ℃, is secondarily cooled to the temperature of 70-90 ℃ by a heat exchanger, and the generated kerosene and coal gas are respectively discharged through two pipelines.

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