CN115353917B - Annular fluidization viscosity breaking conveying device and method for pulverized coal - Google Patents
Annular fluidization viscosity breaking conveying device and method for pulverized coal Download PDFInfo
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- CN115353917B CN115353917B CN202211116003.2A CN202211116003A CN115353917B CN 115353917 B CN115353917 B CN 115353917B CN 202211116003 A CN202211116003 A CN 202211116003A CN 115353917 B CN115353917 B CN 115353917B
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- 239000003245 coal Substances 0.000 title claims abstract description 148
- 238000005243 fluidization Methods 0.000 title claims abstract description 98
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 137
- 239000002245 particle Substances 0.000 claims abstract description 56
- 238000002156 mixing Methods 0.000 claims abstract description 51
- 238000009826 distribution Methods 0.000 claims abstract description 36
- 238000000926 separation method Methods 0.000 claims abstract description 25
- 238000011084 recovery Methods 0.000 claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 18
- 239000007787 solid Substances 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 98
- 238000006243 chemical reaction Methods 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 7
- 238000005245 sintering Methods 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 2
- 239000003292 glue Substances 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 13
- 238000000197 pyrolysis Methods 0.000 abstract description 12
- 239000002028 Biomass Substances 0.000 abstract description 2
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 239000011362 coarse particle Substances 0.000 description 3
- 238000002309 gasification Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000011284 carbonization tar Substances 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 239000011280 coal tar Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
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- Environmental & Geological Engineering (AREA)
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- Geology (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Combined Means For Separation Of Solids (AREA)
Abstract
The annular fluidization viscosity breaking conveying device and method for the pulverized coal comprises a pulverized coal feeding unit, a fluidization viscosity breaking unit, a lifting separation unit, a light powder recovery unit and a pulverized coal conveying unit. The feeding unit is responsible for conveying pulverized coal; the fluidization viscosity breaking unit comprises a viscosity breaking area, an annular fluidization device and a discharge hole, and is used for completing fluidization viscosity breaking of pulverized coal and providing non-viscous raw materials for the conveying device, so that the conveying is smooth; the lifting separation unit comprises a reducing lifting section, a gas-solid separation area, a fine powder falling area and a light powder recovery area, wherein the powder is subjected to multistage separation, and raw coal fine powder is recovered through a fine powder collector, so that the particle distribution property of raw coal is maintained, and the raw coal amount is maintained; the pulverized coal conveying unit comprises a pulverized coal stirring and mixing area and a conveying device, and raw material pulverized coal conveying is completed. The device greatly improves the raw material selectivity of technologies such as pulverized coal pyrolysis, coal and biomass co-pyrolysis and heavy inferior oil co-pyrolysis while expanding the application range of caking coal through coupling with the pyrolysis and pyrolysis technologies.
Description
Technical Field
The invention belongs to the field of energy and chemical industry, and particularly relates to a pulverized coal annular fluidization viscosity breaking conveying device and method.
Background
Along with development of coal utilization technology, in order to promote depth and breadth of coal utilization, the extension of the bonding coal to the high-efficiency clean grading utilization field of coal is widened, and advanced high-viscosity coal viscosity reduction device and method with wide adaptability need to be developed.
In recent years, the coal pyrolysis gasification technology is deeply focused by scientific research institutes as an important technology for the quality-based efficient utilization of coal, and the coal pyrolysis gasification technology refers to a complex process of continuously decomposing and converting coal into coal tar, solid coke and synthetic gas under inert/non-inert atmosphere by heating. The pyrolysis gasification technology of coal has some requirements on indexes such as particle size, volatile matters, ash content, ash melting point, cohesiveness and the like of raw material coal, and the raw material coal is required to be coal with high volatile matters, low cohesiveness, low ash content and high ash melting point in order to ensure process stability, technical economy and exert the maximum advantages of the technology. However, due to different geological conditions of the reservoir, coals in various regions of the country have large differences in ash content, volatile matter, low-temperature carbonization tar yield, cohesiveness, ash meltability and the like. How to select the applicable coal raw materials, so that the technology application generates the maximum economic benefit, how to select the favorable resources, and carry out the technical popularization and the industrial layout, thereby occupying the source market, especially widening the raw coal field, on one hand, seeking upgrading from the process technology, on the other hand, starting from the raw coal, and improving the adaptability of the raw coal through simple and economic pretreatment.
Disclosure of Invention
The invention aims to provide a pulverized coal annular fluidization viscosity breaking conveying device and method which solve the problem of conveying bonded coal and enlarge the application range of the bonded coal on the premise of keeping the property of raw powder to the greatest extent.
In order to achieve the aim, the device comprises a pulverized coal feeding unit, a fluidization viscosity breaking unit, a lifting separation unit, a light powder recovery unit and a pulverized coal conveying unit, wherein the fluidization viscosity breaking unit is arranged on the lower side of the device:
the fluidization breaking and sticking unit comprises a fluidization breaking and sticking area connected with the pulverized coal feeding unit, a ring pipe fluidization gas distributor positioned at the middle lower part of the fluidization breaking and sticking area and a cone part discharge hole at the bottom;
the lifting separation unit comprises a reducing lifting separator, a gas-solid separation area, a fine powder falling area and a light powder recovery area:
the diameter-reducing lifting separator is positioned at the upper part of the fluidization viscosity breaking area and is communicated with the fluidization viscosity breaking area;
the gas-solid separation area comprises a particle classification area which is positioned at the upper end of the reducing lifting separator and communicated with the reducing lifting separator, and a fine powder escape opening which is formed in the side wall of the upper end of the particle classification area;
the fine powder falling area comprises a fine powder falling cavity which is sleeved on the outer walls of the reducing lifting separator and the particle classification area and is connected with the fine powder escape port, the top end of the fine powder falling cavity is connected with a gas filter, filtered gas enters the tail gas treatment unit, and the bottom is provided with a fine powder discharge port;
the light powder recovery zone comprises a fine powder collector and a mixing hopper, the top of the fine powder collector is connected with a discharge port, the bottom of the fine powder collector is connected with the mixing hopper, and the upper end of the mixing hopper is also connected with a cone discharge port;
the pulverized coal conveying unit comprises a pulverized coal stirring and mixing device and a conveying device:
the pulverized coal stirring and mixing device comprises an alternating pressure mixing hopper and a built-in stirrer, wherein the top of the alternating pressure mixing hopper is connected with the mixing hopper, and the bottom of the alternating pressure mixing hopper is connected with the conveying device;
the conveying device comprises a gas distribution filter core tube and a central loose tube which is arranged in the gas distribution filter core tube and is communicated with the alternating pressure mixing hopper, a bottom fluidization gas distributor is arranged at the bottom of the gas distribution filter core tube, a gas inlet of the gas distribution filter core tube is connected with a conveying fluidization gas circuit, and an outlet of the gas distribution filter core tube is connected with the reaction device.
The pulverized coal feeding unit comprises a feeding lock hopper, an inlet of the feeding lock hopper is connected with a raw material pulverized coal storage bin, an outlet of the feeding lock hopper is connected with a feeding hopper, and the feeding hopper is connected with the fluidization viscosity breaking area through a gas conveying pipeline.
The distribution holes of the annular tube fluidization air distributor are round, triangular, diamond-shaped and five-pointed star.
The included angle alpha between the distribution holes of the annular pipe fluidization gas distributor and the plane where the annular ring is positioned is 15-45 degrees.
The diameter of the distribution holes of the annular tube fluidization gas distributor is not more than 1/5 of the diameter of the annular tube.
The viscosity breaking gas introduced by the annular tube fluidization gas distributor is nitrogen gas at 150-300 ℃, air or tail gas after viscosity breaking.
According to the pulverized coal annular fluidization visbreaking and conveying method based on the device, raw coal is conveyed to a fluidization visbreaking area through a feeding lock hopper and a feeding hopper gas conveying pipeline, a pre-oxidation visbreaking reaction is carried out on raw coal and air from a loop fluidization gas distributor, the pre-broken and sticky coal is quickly decelerated through a particle classification area after being subjected to speed increasing and visbreaking through a reducing lifting separator, primary coarse pulverized coal and secondary fine powder are separated, secondary fine powder is deposited and falls back to the fluidization visbreaking area, and the primary coarse pulverized coal are conveyed to a mixing hopper through a cone discharge port; the three-level fine powder escapes to a fine powder falling cavity through a fine powder escape port, the particle size is smaller than 50 mu m, the fine powder is further collected through a light powder recovery area, and gas is filtered by a gas filter of the falling cavity and then enters a tail gas treatment unit; the tertiary fine powder is sent to a fine powder collector for recovery through a discharge port connected with a fine powder falling cavity, and the recovered tertiary fine powder enters a mixing hopper to be mixed with the primary coarse coal powder and the secondary fine powder, so that the particle distribution property of raw coal is maintained to the maximum extent and the loss of the raw coal is reduced;
after three kinds of particles with different particle size grades are premixed, the particles enter an alternating pressure mixing hopper, the hopper is provided with a built-in airflow stirrer, coal powder particles are fully mixed at an inlet, the mixed coal powder enters a subsequent reaction device through a conveying device, a gas distribution filter core tube in the conveying device is a metal sintering tube, the metal sintering tube is wear-resistant, the central air release is distributed from bottom to top by adjusting the bottom fluidization air distributor and conveying the fluidization air channel air quantity, and the coal powder entering the central tube is fluidized, so that the coal powder is smoothly conveyed to the subsequent reaction device.
The invention adopts the annular fluidization viscosity breaking technology and the fine powder recovery system, solves the problem of conveying the bonded coal on the premise of keeping the properties of the raw powder to the greatest extent, and greatly improves the raw material selectivity of technologies such as pulverized coal pyrolysis, co-pyrolysis of coal and biomass and co-pyrolysis of heavy inferior oil by coupling with the pyrolysis and cracking technologies, and enlarges the application range of the bonded coal.
The raw material coal adopts the high-caking coal powder, and the caking index of the raw material can be effectively reduced and the applicability of the raw material coal can be increased through the annular fluidization and viscosity breaking conveying device of the powdered coal; after the cohesive coal is broken and stuck in the fluidized breaking and sticking area, the pulverized coal passes through a diameter-reducing lifting separator, finer particles are taken away from the breaking and sticking area, coarse particles carry out primary separation on the pulverized coal particles, the coarser pulverized coal passes through a cone-shaped discharge port to a mixing hopper, fine powder particles carry out secondary separation in a particle classification area, and secondary fine powder is deposited and falls back to the fluidized breaking and sticking area; the particle distribution property of the raw coal and the weight of the raw coal are maintained to the greatest extent by combining the diameter-reducing lifting separation unit and the light powder recovery unit.
Further, after the cohesive coal is broken and stuck in the fluidized breaking and sticking area, the coal powder passes through a reducing lifting separator, finer particles are taken away from the breaking and sticking area, the coal powder particles are subjected to primary separation, coarser coal powder passes through a cone-shaped discharge port to a mixing hopper, fine powder particles are subjected to secondary separation in a particle classification area, secondary fine powder is deposited and falls back to the fluidized breaking and sticking area, tertiary fine powder falls to a fine powder falling cavity through a fine powder escape port, enters a fine powder collector through a fine powder collector after passing through a fine powder collector, is recycled into the mixing hopper and is mixed with primary coarse coal powder and tertiary fine powder, and the particle distribution property of raw coal and the weight of raw coal are maintained to the greatest extent;
further, the distribution holes of the annular pipe fluidization gas distributor can be in the shape of circles, triangles, diamonds, pentagram and other regular polygons, and the included angles between the distribution holes and the plane of the annular ring are selectedαThe design of the device can meet the requirement of fluidization in a viscosity breaking area on the gas speed;
furthermore, the alternating pressure mixing hopper is provided with a built-in airflow stirrer, three particles with different particle size grades enter the alternating pressure mixing hopper after being premixed, and coal dust particles are fully and uniformly mixed at an inlet and are more similar to a natural mixing state of raw coal;
further, the gas distribution filter core tube in the conveying device is a metal sintering tube, the gas distribution filter core tube is wear-resistant, the central air release tube is distributed from bottom to top from large to small by adjusting the bottom fluidization gas distributor and conveying the fluidization gas path air quantity, the pulverized coal entering the central tube is fluidized, the pulverized coal is smoothly conveyed to a subsequent reaction device, and the visbreaking conveying device is effectively combined with the subsequent reaction device.
Drawings
Fig. 1 is an overall construction diagram of the present invention.
In the figure: 1. a feeding lock hopper; 2. a hopper; 3. a fluidization breaking and sticking area; 4. a fluidization gas distributor; 5. a cone part discharge hole; 6. reducing and lifting the separator; 7. a particle classification zone; 8. a fines escape port; 9. a gas filter; 10. a tail gas treatment unit; 11. fine powder falls back into the cavity; 12. a discharge port; 13. a fines collector; 14. a mixing hopper; 15. alternating-pressure mixing hopper; 16. a built-in stirrer; 17. a gas distribution filter core tube; 18. a central loose tube; 19. a bottom fluidization gas distributor; 20. conveying a fluidization gas passage; 21. a reaction device; 22. and distributing holes.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, the device comprises a pulverized coal feeding unit, a fluidization viscosity breaking unit, a lifting separation unit, a light powder recovery unit and a pulverized coal conveying unit:
the pulverized coal feeding unit comprises a feeding lock hopper 1 and a feeding hopper 2, wherein the feeding lock hopper 1 is connected with an upper raw material pulverized coal storage bin, the lower part of the feeding lock hopper is connected with the feeding hopper 2, and the feeding hopper 2 sends raw material pulverized coal to a fluidization breaking and sticking area 3 through a gas conveying pipeline;
the fluidization breaking unit comprises a fluidization breaking area 3, a circular pipe fluidization gas distributor 4 and a cone-shaped discharge port 5, wherein the upper part of the fluidization breaking area 3 is connected with a reducing lifting separator 6, the circular pipe fluidization gas distributor 4 is positioned at the middle lower part of the fluidization breaking area 3, the bottom of the fluidization breaking area 3 is provided with the cone-shaped discharge port 5, and the cone-shaped discharge port 5 is connected with a mixing hopper 14;
the lifting separation unit comprises a reducing lifting separator 6, a gas-solid separation area, a fine powder falling area and a light powder recovery area:
the gas-solid separation area comprises a particle classification area 7 and a fine powder escape opening 8, the fluidized broken and stuck pulverized coal is quickly decelerated through the particle classification area 7 after being subjected to speed-up breaking and sticking through a diameter-reducing lifting separator, coarse pulverized coal and fine powder are separated, fine powder escapes through the fine powder escape opening 8, and coarse particles return to the fluidized broken and stuck area 3;
the fine powder falling unit comprises a fine powder falling cavity 11, a discharge hole 12 and a gas filter 9, wherein the lower part of the fine powder falling cavity 11 is connected with the discharge hole 12, the top of the fine powder falling cavity is connected with the gas filter 9, and filtered gas enters the tail gas treatment unit 10;
the light powder recovery unit mainly comprises a fine powder collector 13 and a mixing hopper 14, wherein the top of the fine powder collector 13 is connected with the discharge port 12, and the bottom of the fine powder collector is connected with the mixing hopper 14;
the pulverized coal conveying unit comprises a pulverized coal stirring and mixing device and a conveying device:
the pulverized coal stirring and mixing device comprises an alternating pressure mixing hopper 15 and a built-in stirrer 16, wherein the top of the alternating pressure mixing hopper 15 is connected with the mixing hopper 14, and the bottom of the alternating pressure mixing hopper 15 is connected with the conveying device;
the conveying device comprises a conveying fluidization gas path 20, a bottom fluidization gas distributor 19, a central loose tube 18 and a gas distribution filter core tube 17, and pulverized coal is conveyed into a subsequent reaction device 21 through the conveying device;
the coal is high-caking coal powder, and the caking index of the raw materials can be effectively reduced and the applicability of the raw materials can be improved through the annular fluidization and viscosity breaking conveying device of the pulverized coal;
the viscosity breaking gas is nitrogen, air and tail gas after viscosity breaking, and the viscosity breaking tail gas and heat can be effectively recovered;
the viscosity breaking temperature is controlled between 150 ℃ and 300 ℃, and the heat taking mode is external heat taking;
the distribution holes of the annular pipe fluidization gas distributor positioned in the fluidization visbreaking area can be in the shape of a circle, a triangle, a diamond, a five-pointed star and other regular polygons;
the included angle alpha between the distribution holes of the annular pipe fluidization gas distributor positioned in the fluidization viscosity breaking area and the plane where the annular shape is positioned is 15-45 degrees;
the diameter of the distribution holes of the annular tube fluidization gas distributor positioned in the fluidization visbreaking area is not more than 1/5 of the diameter of the annular tube;
the caking property is subjected to breaking and adhesion through the fluidization breaking and adhesion area, the pulverized coal passes through a diameter reduction lifting separator, finer particles are taken away from the breaking and adhesion area, coarse particles carry out primary separation on the pulverized coal particles, and the coarser pulverized coal passes through a cone part discharge hole to a mixing hopper;
the fine powder particles are subjected to secondary separation in a particle classification area, secondary fine powder is deposited and falls back to a fluidization visbreaking area, tertiary fine powder falls to a fine powder falling cavity through a fine powder escape port, gas is filtered by a gas filter of the falling cavity and enters a tail gas treatment unit, and the particle size of the tertiary fine powder is smaller than 50 mu m;
the fine powder particles enter a fine powder collector through a discharge port, are recycled into a mixing hopper through the fine powder collector, and are mixed with primary coarse coal powder and tertiary fine powder;
after the three particles with different particle size grades are premixed, the particles enter an alternating pressure mixing hopper, and the hopper is provided with a built-in airflow stirrer to fully mix the pulverized coal particles at an inlet; the pressure of the alternating-pressure mixing hopper is 0-1.0Mpa;
the particle distribution property of raw coal and the weight of the raw coal are maintained to the greatest extent by combining the lifting separation unit with the light powder recovery unit;
the mixed coal powder enters a subsequent reaction system through a conveying device, a gas distribution filter core tube in the conveying device is a metal sintering tube, the wear resistance is realized, and the coal powder entering the central tube is fluidized by adjusting the bottom fluidizing gas and the central loose tube gas from top to bottom from large to small so as to further finish conveying;
the raw material coal has a caking index (GRI) of more than 30, the temperature of a viscosity breaking fluidization area is not more than 250 ℃, and the pressure of a fluidization viscosity breaking unit, a lifting separation unit and a light powder recovery unit of the viscosity breaking device is 0-0.5 MPa;
the annular fluidization viscosity breaking conveying method for pulverized coal comprises the following steps:
the high caking coal has poor fluidization performance, large conveying resistance, easy agglomeration, caking and bridging, and can not meet the requirement of conveying raw materials for the subsequent reaction device 21, so that the fluidization and viscosity breaking device is adopted for pre-fluidization and viscosity breaking. Raw coal is conveyed to a fluidization breaking and bonding area 3 through a feeding lock hopper 1 and a feeding hopper 2 by a shortest flow and through a gas conveying pipeline, a pre-oxidation breaking and bonding reaction is carried out on the raw coal and air from a circular pipe fluidization gas distributor 4 at a certain temperature and pressure, after the pre-breaking and bonding reaction, the raw coal is quickly decelerated through a particle classification area 7 after being subjected to speed increasing and bonding breaking through a reducing lifting separator 6, primary coarse coal powder and secondary fine powder are separated, the secondary fine powder is deposited and falls back to the fluidization breaking and bonding area 3, and the primary coarse coal are conveyed to a mixing hopper 14 through a cone discharging hole 5; the tertiary fine powder escapes to a fine powder falling cavity 11 through a fine powder escape port 8, the particle size is smaller than 50 mu m, the fine powder is further collected through a light powder recovery area, and gas enters a tail gas treatment unit 10 after being filtered by a falling cavity gas filter 9; the tertiary fine powder is sent to a fine powder collector 13 for recovery through a discharge hole 12 connected with a fine powder falling cavity 11, and the recovered tertiary fine powder enters a mixing hopper 14 to be mixed with the primary coarse coal powder and the secondary fine powder, so that the particle distribution property of raw coal is maintained to the maximum extent and the loss of the raw coal is reduced.
After three kinds of particles with different particle size grades are premixed, the particles enter an alternating pressure mixing hopper 15, the hopper is provided with a built-in airflow stirrer 16, coal powder particles can be fully mixed at an inlet, the mixed coal powder enters a subsequent reaction device 21 through a conveying device, a gas distribution filter core tube 17 in the conveying device is a metal sintering tube, the wear resistance is realized, the gas quantity of a central loose tube 18 is distributed from bottom to top by adjusting the gas quantity of a bottom fluidization gas distributor 19 and a conveying fluidization gas circuit 20, the coal powder fluidization entering the central tube is promoted, and the coal powder is smoothly conveyed to the subsequent reaction device 21.
Claims (7)
1. The utility model provides a broken conveyor that glues of annular fluidization of fine coal which characterized in that: the device comprises a pulverized coal feeding unit, a fluidization viscosity breaking unit, a lifting separation unit, a light powder recovery unit and a pulverized coal conveying unit:
the fluidization viscosity breaking unit comprises a fluidization viscosity breaking area (3) connected with the pulverized coal feeding unit, a ring pipe fluidization gas distributor (4) positioned at the middle lower part of the fluidization viscosity breaking area (3) and a cone-shaped discharge hole (5) at the bottom;
the lifting separation unit comprises a reducing lifting separator (6), a gas-solid separation area, a fine powder falling area and a light powder recovery area:
the diameter-reducing lifting separator (6) is positioned at the upper part of the fluidization viscosity breaking area (3) and is communicated with the fluidization viscosity breaking area;
the gas-solid separation area comprises a particle classification area (7) which is positioned at the upper end of the reducing and lifting separator (6) and communicated with the reducing and lifting separator, and a fine powder escape opening (8) which is arranged on the side wall of the upper end of the particle classification area;
the fine powder falling area comprises a fine powder falling cavity (11) which is sleeved on the outer walls of the reducing lifting separator (6) and the particle classification area (7) and is connected with the fine powder escape port (8), the top end of the fine powder falling cavity (11) is connected with the gas filter (9), filtered gas enters the tail gas treatment unit (10), and a fine powder discharge port (12) is formed in the bottom of the fine powder falling cavity;
the light powder recovery zone comprises a fine powder collector (13) and a mixing hopper (14), the top of the fine powder collector (13) is connected with the discharge port (12), the bottom of the fine powder collector is connected with the mixing hopper (14), and the upper end of the mixing hopper (14) is also connected with the cone discharge port (5);
the pulverized coal conveying unit comprises a pulverized coal stirring and mixing device and a conveying device:
the pulverized coal stirring and mixing device comprises an alternating pressure mixing hopper (15) and a built-in stirrer (16), wherein the top of the alternating pressure mixing hopper (15) is connected with the mixing hopper (14), and the bottom of the alternating pressure mixing hopper (15) is connected with the conveying device;
the conveying device comprises a gas distribution filter core tube (17) and a central loose tube (18) which is arranged in the gas distribution filter core tube and is communicated with the alternating pressure mixing hopper (15), a bottom fluidization gas distributor (19) is arranged at the bottom of the gas distribution filter core tube (17), a gas inlet of the gas distribution filter core tube (17) is connected with a conveying fluidization gas circuit (20), and an outlet of the gas distribution filter core tube is connected with a reaction device (21).
2. The pulverized coal annular fluidization breaking and sticking conveying device according to claim 1, wherein: the pulverized coal feeding unit comprises a feeding lock hopper (1) with an inlet connected with a raw material pulverized coal storage bin and an outlet connected with a feeding hopper (2), and the feeding hopper (2) is connected with a fluidization breaking and sticking area (3) through a gas conveying pipeline.
3. The pulverized coal annular fluidization breaking and sticking conveying device according to claim 1, wherein: the distribution holes (22) of the annular tube fluidization gas distributor (4) are round, triangular, diamond-shaped and five-pointed star-shaped.
4. The pulverized coal annular fluidization breaking and sticking conveying device according to claim 3, wherein: the included angle alpha between the distribution holes (22) of the annular pipe fluidization gas distributor (4) and the plane where the annular shape is positioned is 15-45 degrees.
5. The pulverized coal annular fluidization breaking and sticking conveying device according to claim 1, wherein: the diameter of the distribution holes (22) of the annular tube fluidization gas distributor (4) is not more than 1/5 of the diameter of the annular tube.
6. The pulverized coal annular fluidization breaking and sticking conveying device according to claim 1, wherein: the viscosity breaking gas introduced by the annular tube fluidization gas distributor (4) is nitrogen gas at 150-300 ℃ and air or tail gas after viscosity breaking.
7. A pulverized coal annular fluidization viscosity breaking conveying method of the apparatus according to any one of claims 1 to 6, characterized in that:
raw coal is conveyed to a fluidization visbreaking area (3) through a feeding lock hopper (1) and a gas conveying pipeline of a feeding hopper (2), a pre-oxidation visbreaking reaction is carried out on raw coal and air from a circular pipe fluidization gas distributor (4), the pre-visbreaking coal is accelerated and visbroken through a reducing lifting separator (6), the speed of the pre-visbreaking coal is reduced through a particle grading area (7), primary coarse coal and secondary fine powder are separated, secondary fine powder is deposited and falls back to the fluidization visbreaking area (3), and the primary coarse coal are conveyed to a mixing hopper (14) through a cone part discharge port (5); the three-level fine powder escapes to a fine powder falling cavity (11) through a fine powder escape port (8), the particle size is smaller than 50 mu m, the fine powder is further collected through a light powder recovery area, and gas enters a tail gas treatment unit (10) after being filtered by a falling cavity gas filter (9); the tertiary fine powder is sent to a fine powder collector (13) for recovery through a discharge hole (12) connected with a fine powder falling cavity (11), and the recovered tertiary fine powder enters a mixing hopper (14) to be mixed with the primary coarse coal powder and the secondary fine powder, so that the particle distribution property of raw coal is maintained to the maximum extent and the loss of the raw coal is reduced;
after the particles with three different particle size grades are premixed, the particles enter an alternating pressure mixing hopper (15), the hopper is provided with a built-in airflow stirrer (16), coal powder particles are fully mixed at an inlet, mixed coal powder enters a subsequent reaction device (21) through a conveying device, a gas distribution filter core tube (17) in the conveying device is a metal sintering tube, the metal sintering tube is wear-resistant, the gas quantity of a central loose tube (18) is distributed from bottom to top from large to small by adjusting the gas quantity of a bottom fluidization gas distributor (19) and a conveying fluidization gas circuit (20), and coal powder entering the central tube is fluidized, so that the coal powder is smoothly conveyed to the subsequent reaction device (21).
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20060214036A1 (en) * | 2005-03-14 | 2006-09-28 | Nobuyasu Makino | Air-flow classification apparatus and method for classification |
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| US3619142A (en) * | 1969-02-11 | 1971-11-09 | Consolidation Coal Co | Continuous steam-iron process |
| GB2108006A (en) * | 1981-08-01 | 1983-05-11 | Steag Ag | Process for pulverising raw coal with the aid of an impact pulveriser and apparatus for carrying out the process |
| CN1129610A (en) * | 1994-10-06 | 1996-08-28 | 石油大学(北京) | Fluid-bed opposite-jetting superthin air flow crusher |
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| CN212955019U (en) * | 2020-07-02 | 2021-04-13 | 新奥科技发展有限公司 | High-caking coal viscosity breaking device |
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