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CN-121994001-A - Lignite drying production line

CN121994001ACN 121994001 ACN121994001 ACN 121994001ACN-121994001-A

Abstract

The invention discloses a lignite drying production line which comprises a fluidized bed furnace, a roller dryer, an air dust remover, a closed oxygen-blocking screw conveyor, a humidifying stirrer, a wet dust remover, a waste heat drying cooling tower, an induced draft fan and a tail gas treatment system, wherein the air dust remover is arranged on the fluidized bed furnace; the lower part of the discharge end of the roller dryer is provided with a discharge hole, the upper part of the roller dryer is used for conveying dust-containing flue gas to the cyclone dust collector through a pipeline, the lower part of the cyclone dust collector is connected with one end of the closed oxygen-blocking screw conveyor, the bottom of the other end of the closed oxygen-blocking screw conveyor is connected to the humidifying agitator through a pipeline, the upper part of the cyclone dust collector is communicated to the wet dust collector through a pipeline, an air outlet on the wet dust collector is communicated to the waste heat drying cooling tower through a pipeline, gas coming out of the waste heat drying cooling tower is connected to the induced draft fan through a pipeline, and the induced draft fan is used for conveying the gas to the tail gas treatment system through a pipeline.

Inventors

  • LI JINBO
  • Pu Aogang

Assignees

  • 开远市东弘能源有限公司

Dates

Publication Date
20260508
Application Date
20260330

Claims (10)

  1. 1. The lignite drying production line comprises a fluidized bed furnace (1) and a roller dryer (2), wherein the fluidized bed furnace (1) is arranged close to a feed end (24) of the roller dryer (2), and a hot flue gas outlet of the fluidized bed furnace is communicated with the roller dryer (2), and is characterized by further comprising a cyclone dust collector (3), a closed type oxygen-blocking screw conveyor (4), a humidifying stirrer (5), a wet dust collector (6), a waste heat drying cooling tower (7), an induced draft fan (8) and a tail gas treatment system (9); The lower part of the discharging end of the roller dryer (2) is provided with a discharging hole (21), the upper part of the roller dryer conveys dust-containing flue gas to the cyclone dust collector (3) through a pipeline, a second belt conveyor (22) is arranged below the discharging hole (21), the lower part of the cyclone dust collector (3) is connected with one end of a closed oxygen-blocking screw conveyor (4) and is used for conveying dust particles discharged from the cyclone dust collector (3), the bottom of the other end of the closed oxygen-blocking screw conveyor (4) is connected to a humidifying agitator (5) through a pipeline, a third belt conveyor (55) is correspondingly arranged at an outlet (51) of the humidifying agitator (5), the upper part of the cyclone dust collector (3) is communicated to a wet dust collector (6) through a pipeline, the air outlet on the wet dust collector (6) is communicated to a waste heat drying cooling tower (7) through a pipeline, the air discharged from the waste heat drying cooling tower (7) is connected to an induced draft fan (8) through a pipeline, and the induced draft fan (8) conveys the air to a tail gas treatment system (9) through a pipeline.
  2. 2. The lignite drying production line according to claim 1 is characterized in that the closed type oxygen-blocking screw conveyor (4) comprises a sealing tube (41), a rotating shaft (42), screw blades (43), a flange (44), a sealing bearing (45) and an explosion-proof speed reducing motor (46), the flanges (44) are arranged at two ends of the sealing tube (41), the rotating shaft (42) penetrates through the sealing tube (41) and the flanges (44), the screw blades (43) are fixedly arranged on the outer wall of the sealing tube (41), the outer edge of the screw blades (43) is in contact connection with the inner wall of the sealing tube (41), one end of the rotating shaft (42) is connected with the explosion-proof speed reducing motor (46), the other end of the rotating shaft (42) is rotatably connected with the flanges (44) through a mechanical seal, one end of the sealing tube (41) is in sealing connection with the lower portion of the cyclone dust collector (3), and a dust outlet (47) used for communicating with the humidifying stirrer (5) is formed in the other end.
  3. 3. The lignite drying production line is characterized in that the humidifying stirrer (5) is a double-shaft humidifying stirrer, a sealing cover plate (52) is arranged at the top of the humidifying stirrer, the side wall of the humidifying stirrer (5) is connected with a spraying pipeline (53), a plurality of spray heads (54) are distributed on the spraying pipeline (53) in the humidifying stirrer (5), and alkaline water is arranged in the spraying pipeline (53).
  4. 4. The lignite drying production line according to claim 1 is characterized in that the lignite drying cooling tower (7) comprises a tower body (71), a feeding hole (72), a discharging hole (73), an air inlet pipe (74), an air outlet pipe (75), a radiating pipe (76), a moisture discharging fan (77) and a belt lifter (78), the feeding hole (72) with a switch door is arranged at the top of the tower body (71), the discharging hole (73) with a valve is arranged at the bottom of the tower body, the air inlet pipe (74) is arranged in the tower body (71) above the discharging hole (73), the air outlet pipe (75) is arranged in the tower body (71) below the feeding hole (72), a plurality of radiating pipes (76) are communicated between the air inlet pipe (74) and the air outlet pipe (75), radiating fins are arranged on the radiating pipes (76), the moisture discharging fan (77) is arranged at the top of the tower body (71) and is arranged on one side of the tower body (71), and the discharging hole is arranged right above the feeding hole (72) and is used for conveying raw material coal into the lignite drying cooling tower (7).
  5. 5. A lignite drying production line according to claim 4 is characterized in that one end of an air inlet pipe (74) is communicated with an air outlet of a wet dust collector (6) through a pipeline, the other end of the air inlet pipe is of a closed structure, one end of an air outlet pipe (75) is of a closed structure, the other end of the air outlet pipe is connected to an induced draft fan (8) through a pipeline, and air discharged from a wet exhaust fan (77) is also connected into the pipeline.
  6. 6. The lignite drying production line according to claim 4 or 5 is characterized in that two discharge ports (73) are formed in the bottom of the tower body (71), the two discharge ports are arranged side by side, screw conveyors are correspondingly arranged below the discharge ports (73), and a plurality of temperature and humidity sensors (79) are distributed and installed on the side wall of the tower body (71) from top to bottom.
  7. 7. The lignite drying production line according to claim 1, wherein the tail gas treatment system (9) comprises a sedimentation tank (91), a spray pipeline (92) and a chimney (93) arranged on the sedimentation tank (91); The lower part of the sedimentation tank (91) is provided with a tap water area (901), one end of the sedimentation tank is provided with a gas inlet (902), a pipeline on the gas inlet (902) is communicated with an induced draft fan (8), and a baffle channel (903) and a screen (904) which are used for enabling gas to circulate in a curve are arranged near the gas inlet (902); The spraying pipeline (92) comprises a main pipe (921) and three branch pipes which are separated from the main pipe (921), the first branch pipe (922) is arranged inside the sedimentation tank (91), the second branch pipe (923) and the third branch pipe (924) are connected into the chimney (93), and the main pipe (921) of the spraying pipeline (92) is connected with a tap water area (901) at the lower part of the sedimentation tank (91).
  8. 8. The lignite drying production line according to claim 7, wherein the chimney (93) comprises a chimney body (931), the chimney body (931) is arranged at one end of the sedimentation tank (91) far away from the gas inlet (902), a first channel steel bracket (932) is fixedly arranged at the bottom of the chimney body, a plurality of layers of stainless steel screens are arranged on the first channel steel bracket (932), a first backfill layer (933) is arranged in the chimney body (931) above the first channel steel bracket (932), and a second branch pipe (923) is arranged above the first backfill layer (933); And a second channel steel bracket (934) is fixedly arranged in the chimney body (931) above the second branch pipe (923) at a certain distance, a plurality of layers of stainless steel screens are arranged on the second channel steel bracket (934), a second backfill layer (935) is arranged in the chimney body (931) above the second channel steel bracket (934), and a third branch pipe (924) is arranged above the second backfill layer (935).
  9. 9. The lignite drying production line according to claim 8, wherein the first backfill layer (933) and the second backfill layer (935) are ceramic chip layers.
  10. 10. The lignite drying production line according to any one of claims 1-4 is characterized in that two cyclone dust collectors (3) are arranged, the two cyclone dust collectors (3) are arranged in parallel, the bottom of each cyclone dust collector (3) is communicated with a closed oxygen-blocking screw conveyor (4), and dust-containing flue gas from a roller dryer (2) enters the two cyclone dust collectors (3) through pipelines.

Description

Lignite drying production line Technical Field The invention belongs to the technical field of lignite powder production, and particularly relates to a lignite drying production line. Background The drying and upgrading of the lignite powder is a key link for improving the industrial application value of the lignite powder. At present, an integrated process of drying and upgrading and pulverizing and a superheated steam drying and molding process are mainly adopted in the industry. However, these two technologies are mostly limited to removing part of the surface moisture of lignite, and the dewatering effect is not thorough. After treatment, the water content of the lignite is still higher than 20%, so that the calorific value of the lignite is generally lower than 4000 kcal/kg, the thermal efficiency is lower, and the use standard of industrial grade fuel is difficult to reach. In addition, only the lignite with surface moisture removed still keeps a large amount of capillary pore structures, moisture is easy to absorb and return in the storage and transportation processes, the moisture content is increased again, the heating value is reduced, the product quality is unstable, and the long-term storage performance and the application effect of the lignite are seriously affected. On the other hand, part of the processes adopt a mode of directly contacting the flue gas with coal for drying, but because the flue gas often contains oxygen with a certain concentration, combustion and even explosion accidents are easy to occur under specific conditions, so that a large potential safety hazard is brought to the production process, and the stable operation and large-scale popularization of the technology are also limited. Therefore, development of safer and more efficient deep dehydration technology for lignite is needed to improve the calorific value, improve the storage stability and meet the strict requirements of industrial application. Disclosure of Invention The invention aims to provide a lignite drying production line, which solves the problems of incomplete lignite dehydration, easy combustion initiation, even explosion and the like in the prior art. The invention provides a lignite drying production line which comprises a fluidized bed furnace and a roller dryer, wherein the fluidized bed furnace is arranged close to the feed end of the roller dryer, and a hot flue gas outlet of the fluidized bed furnace is communicated with the roller dryer; The lower part of the discharge end of the roller dryer is provided with a discharge hole, the upper part of the discharge end is used for conveying dust-containing flue gas to the cyclone dust collector through a pipeline, a second belt conveyor is arranged below the discharge hole, the lower part of the cyclone dust collector is connected with one end of the closed oxygen-blocking screw conveyor and used for conveying dust particles discharged from the cyclone dust collector, the bottom of the other end of the closed oxygen-blocking screw conveyor is connected to the humidifying mixer through a pipeline, the outlet of the humidifying mixer is correspondingly provided with a third belt conveyor, the upper part of the cyclone dust collector is communicated to the wet dust collector through a pipeline, an air outlet on the wet dust collector is communicated to the waste heat drying cooling tower through a pipeline, the air discharged from the waste heat drying cooling tower is connected to the induced draft fan through a pipeline, and the induced draft fan is used for conveying the air to the tail gas treatment system through a pipeline. The sealed oxygen-blocking screw conveyer comprises a sealing pipe, a rotating shaft, helical blades, a flange, a sealing bearing and an explosion-proof speed reducing motor, wherein the flange is arranged at two ends of the sealing pipe, the rotating shaft penetrates through the sealing pipe and the flange, the helical blades are fixedly arranged on the outer wall of the rotating shaft, which is positioned in the sealing pipe, the outer edges of the helical blades are in contact connection with the inner wall of the sealing pipe, one end of the rotating shaft is connected with the explosion-proof speed reducing motor, the other end of the rotating shaft is rotatably connected with the explosion-proof speed reducing motor through the sealing bearing, the rotating shaft and the flange are sealed mechanically, one end of the sealing pipe is connected with the lower part of the cyclone dust collector in a sealing way, and a dust outlet used for being communicated with a humidifying stirrer is formed in the other end of the sealing pipe. Preferably, the humidifying mixer is a double-shaft humidifying mixer, a sealing cover plate is arranged at the top of the humidifying mixer, the side wall of the humidifying mixer is connected with a spray pipeline, a plurality of spray heads are distributed on the spray pipeline in the humidifying mixe