CN102728448A

CN102728448A - Dry coal preparation device for fluidized bed

Info

Publication number: CN102728448A
Application number: CN2012101903711A
Authority: CN
Inventors: 王庆功; 吴玉新; 吕俊复; 尹炜迪; 韦鲁滨
Original assignee: Tsinghua University
Current assignee: Taiyuan Boiler Group Co ltd
Priority date: 2012-06-08
Filing date: 2012-06-08
Publication date: 2012-10-17
Anticipated expiration: 2032-06-08
Also published as: CN102728448B

Abstract

The invention relates to a dry coal preparation device for a fluidized bed, which comprises a sorting chamber, a coal inlet, a sorting medium inlet, an air distributing system, a sunk coal discharging system, a float coal overflow port and an exhaust port, wherein the sunk coal discharging system comprises a plurality of sunk coal storing chambers; a sunk coal intermittent discharging valve is mounted at the bottom end of each of the sunk coal storing chambers; a row of air distributing pipes are arranged in each of the sunk coal storing chambers; a series of small air distributing holes are formed on the downside of the air distributing pipes; air distribution is realized by each air distributing chamber; and the exhaust port is connected with a side part of the coal inlet through a pipeline and utilizes exhaust to realize the primary air separation and local dry of the inlet coal. The complexity and instability of a chain transmission scraper blade device are omitted according to the dry coal preparation device for the fluidized bed; the continuous sorting and discharging for sunk and float coals are easily realized; the air distribution is uniform and stable and the coal grains are prevented from falling into an air supply system; and the dry coal preparation device for the fluidized bed has an excellent sorting effect and can simultaneously realize the dry sorting and drying process of the raw coal.

Description

A kind of fluid bed dry coal preparation equipment

Technical field

The present invention relates to a kind of fluid bed dry coal preparation equipment, belong to a kind of dry method preparation equipment that fluid bed principle and fluidization technology is applied to coal separation.

Background technology

Coal in China reserves and output are all at the forefront in the world, and in significant period of time from now on, coal all will be first energy of China.But few, the skewness of China's high-quality coal and directly utilize seriously pollutedly simultaneously, so coal separation becomes the main means of obtaining high-quality coal.The restriction of factors such as distribution of water resources is uneven with supply because the wet coal preparation technology receives in recent years, some coal wet concentrations are prone to easy freezing under argillization and the severe cold condition, the dry coal preparation technology grows up gradually and is worldwide utilized.

Present disclosed dressing coal with dry fluidized bed equipment; For example disclosed dressing coal with dry fluidized bed method and apparatus of Chinese patent CN87101056 and the dense medium fluidized bed dry separation device of the disclosed large-scale air of Chinese patent CN92111310.2; Its principal character is and comprises the chain scraper induction system, in order to the hypostasis of sorting is discharged fluid bed with floating thing from different outlets.Utilize that chain scraper is realized sinking, the major defect of floating particles output is that this chain scraper has had a strong impact on particle layering and bed sorting; Cause the mispairing of light, heavy coal; Cause separating effect to descend, make that simultaneously whole fluidized system complicacy is huge and reduce operation stability of equipment greatly.

In addition, directly utilize air compartment and fluid bed tradition air distribution plate structure to make the duff grain to fall into air compartment, cause line clogging and compartment pressure imbalance etc. through air distribution plate; Dry coal preparation fluid bed coal preparation technology is to going into coal particle size and humidity range is had relatively high expectations; Too much the duff grain is piled up in bed and can seriously be reduced separating effect; And moisture is bigger, separating effect is also poor more, and therefore dry separation bed capable of using itself is gone into coal secondary screening and dry.

Summary of the invention

The present invention is directed to the deficiency and the defective that exist in the existing dry method fluid bed coal preparation technology; A kind of fluid bed dry coal preparation equipment is proposed; This equipment has been cancelled traditional chain gearing, respectively through heavy coal apotheca and intermittently blow-off valve, float coal overfall will sink, the float coal grain discharges fluid bed; Simultaneously, exhaust feeds the coal supply pipeline, will go into that a coal screens and dry, carries away part duff grain and moisture, to improve the particle diameter lower limit of going into a coal, to reduce moisture.

Technical scheme of the present invention is: a kind of fluid bed dry coal preparation equipment; Comprise separation chamber, coal feed point, separating medium inlet, heavy coal discharge system, float coal overfall and exhaust outlet; Said coal feed point, separating medium inlet and exhaust outlet are positioned at the top of separation chamber; It is characterized in that: said heavy coal discharge system comprises a plurality of heavy coal apothecas, and the bottom of each heavy coal apotheca is equipped with intermittently blow-off valve of a heavy coal; Be furnished with the airduct of arranging in said each heavy coal apotheca; Said wind-distributing pipe downside has a series of cloth wind apertures; Said wind-distributing pipe is realized air distribution by air compartment, and it is outside that said air compartment is arranged at each heavy coal apotheca; Said air compartment links to each other with air supply device through pipeline.

Another technical characterictic of the present invention is: said exhaust outlet comprises first exhaust outlet and second exhaust outlet; Be divided into first coal feed point and second coal feed point by dividing plate in the middle of the said coal feed point; Said first exhaust outlet is connected with a side of first coal feed point through pipeline, and the gas of discharge vertically passes first coal feed point and discharges from opposite side; Said second exhaust outlet is connected with a side of second coal feed point through pipeline, and the gas of discharge vertically passes second coal feed point and discharges from opposite side.

In the technique scheme, the horizontal spacing between the said wind-distributing pipe is 50-300mm; The diameter of said cloth wind aperture is 5-30mm; Said air feed system feeds hot-air or hot flue gas.

Advantage of the present invention is: 1. the separation chamber bottom is provided with heavy coal apotheca and heavy coal blow-off valve at intermittence; Separation chamber's left and right sides wall paper is equipped with the float coal overfall; Respectively in order to will sink, the float coal grain discharges, and avoided the equipment unstability that adopts the chain drive screeding device to bring; 2. big beans charcoal is piled up at heavy coal apotheca and separation chamber bottom in the assorting room, and the air of discharging through the cloth wind system upwards flows through the gap of rough coal grain, therefore piles up the role that the rough coal grain has served as air distribution plate, makes air feed more even; 3. air-distribution device adopts multicell cloth wind structure, and each chamber is made up of air compartment and wind-distributing pipe, has realized the even distributing wind that bed is horizontal; Wind-distributing pipe has a series of air feed apertures down, can prevent that the coal grain from falling in the air feed system through aperture; 4. exhaust outlet links to each other with coal feeding hole through pipeline, makes exhaust before discharging fluid bed, intersect selection by winnowing with coal supply earlier, can the fine breeze of going in the coal grain be carried away like this, and wall has been exempted from too much particulate entering bed, influences separating effect; Simultaneously, exhaust can realize the part of coal dry with the contact process of going into coal; 5. be hot-air or low-temperature flue gas if air feed system supplies with; Then fluidisation assorting room in fluid bed and exhaust with go into intersecting of coal and all can realize drying in the contact process coal; Like this, this invention can realize the dry separation and the dry run of raw coal simultaneously.

Description of drawings

Fig. 1 is that overall structure master of the present invention looks sketch map.

Fig. 2 is an overall structure schematic top plan view of the present invention.

Fig. 3 is a cloth wind system partial schematic diagram of the present invention.

Among the figure: 1-separation chamber; The 2-coal feed point; 2a-first coal feed point; 2b-second coal feed point; 3-sinks the coal apotheca; The heavy coal of 4-is blow-off valve intermittently; 5-float coal overfall; 6a-first exhaust outlet; 6b-second exhaust outlet; 7-separating medium inlet; 8-air compartment; The 9-wind-distributing pipe.

The specific embodiment

Further specify principle of the present invention, concrete structure and preferred forms below in conjunction with accompanying drawing.

Fig. 1 is that overall structure master of the present invention looks sketch map; The present invention includes separation chamber 1, coal feed point 2, separating medium inlet 7, heavy coal discharge system, float coal overfall 5 and exhaust outlet; Coal feed point 2, separating medium inlet 7 and exhaust outlet all are positioned at the top of separation chamber 1, will feed fluidized-bed layer by the coal that certain grade is formed through coal feed point 2; Separating medium constantly feeds through separating medium inlet 7, to replenish the consumption of the loss of separating medium in the assorting room; In assorting room, separating medium serve as bed material and make coal particle in bed by density and granularity layering, ashless fat coal floats on bed face on constantly, contains the ash content heavy coal of more bulky grain (spoil) and then deposits to bottom the bed; Float coal overfall 5 is distributed on the both walls of separation chamber 1, and the light coal grain that floats in the running is constantly discharged the bed body through this float coal overfall 5; Heavy coal discharge system comprises a plurality of heavy coal apothecas 3, and the bottom of each heavy coal apotheca 3 is equipped with intermittently blow-off valve 4 of a heavy coal; The weight that sinks in the running is piled up in heavy coal apotheca 3, and heavy coal is blow-off valve 4 intermittently startings intermittently, and the spoil that constantly will contain more ash content is discharged the bed body, realizes continuous pulp discharge heavy, floating particles thus.

Fig. 2 is an overall structure schematic top plan view of the present invention, and exhaust outlet comprises the first exhaust outlet 6a and the second exhaust outlet 6b; Be divided into the first coal feed point 2a and the second coal feed point 2b by in the middle of the dividing plate by dividing plate in the middle of the coal feed point 2; The first exhaust outlet 6a is connected through the side of pipeline with the first coal feed point 2a; The gas of discharging vertically passes the first coal feed point 2a and discharges from opposite side; Realize that like this exhaust contacted with intersecting of coal supply; Particulate coal that can will go in the coal carries away, and avoids too much fines to get into fluidized-bed layer, in bed, pile up and influence separating effect; Equally, the second exhaust outlet 6b is connected through the side of pipeline with the second coal feed point 2b, and the gas of discharge vertically passes the second coal feed point 2b and discharges from opposite side, realizes the washing that intersects of this a part of exhaust and coal supply.Simultaneously, the washing that intersects of exhaust and coal supply can be taken away the portion of water of going into coal again, realizes the part dry run of coal; If air feed system uses hot-air or flue gas air feed, then the washing process that intersects of fluidisation assorting room in bed and exhaust and coal supply all can be realized the dry run of coal in the coal separation process, i.e. the present invention can realize the dry method washing and the drying of raw coal simultaneously.

Fig. 3 is a cloth wind system partial schematic diagram of the present invention, and the cloth wind system adopts multicell air feed structure, to realize the even distributing wind of each air compartment.Be furnished with the airduct 9 of arranging in each heavy coal apotheca 3; Wind-distributing pipe 9 downsides have a series of cloth wind apertures 10, and the aperture opening mainly is to have avoided the duff material to fall in the cloth wind system through aperture down; Get into bed from cloth wind aperture 10 effluent airs through the particle gap in the heavy coal apotheca 3, the particle of piling up in the therefore heavy coal apotheca 3 has served as the role of air distribution plate, makes that the cloth wind of bed is more even; Wind-distributing pipe 9 is realized air distribution by air compartment 8; Air compartment 8 is arranged at each heavy coal apotheca 3 outside, links to each other with air supply device through pipeline.For realizing the coal separation of size fractionated scope, be convenient to the heavy oarse-grained discharge of coal, the horizontal spacing scope of wind-distributing pipe 9 is 50-300mm; For realize cloth wind evenly and satisfy the requirement of cloth ventilation pressure loss, the diameter range of cloth wind aperture 10 is 5-30mm.

Operation principle of the present invention: air is sent in each air compartment 8 by air supply device, is entered bed by the cloth wind aperture 12 of wind-distributing pipe 9; Go into a coal and separating medium and feed through coal feed point 2 and separating medium inlet 7 respectively, in bed, realize the gas-solid fluidization process, the high-quality light coal that dust burdening is lower then constantly floats on bed face, can cross light coal overfall 5 and discharge the bed body; The more coarse granules such as spoil of dust burdening then sink down into the bed bottom; And in heavy coal apotheca 3, pile up; Heavy coal is 4 intermittently startings of blow-off valve intermittently, and the heavy coal that pile up the bed bottom is discharged the bed body, have realized the continuous-feeding and the discharge of this fluid bed dry coal preparation equipment thus.Air through bed is then discharged by exhaust outlet, before thoroughly discharging bed, exhaust outlet is connected to coal feed point 2 places, utilizes exhaust will go into coal and carries out washing, to take away part fines coal and the moisture in the coal, to improve the separating effect of bed.In addition, air feed system can provide hot-air or low-temperature heat flue gas, and like this, the hot gas medium serves as fluidization air, in said process, realizes the dry run of coal greatly, realizes fluid bed dry coal preparation and dry run simultaneously with this.

Claims

1. fluid bed dry coal preparation equipment; Comprise separation chamber (1), coal feed point (2), separating medium inlet (7), heavy coal discharge system, float coal overfall (5) and exhaust outlet; Said coal feed point (2), separating medium inlet (7) and exhaust outlet are positioned at the top of separation chamber (1); It is characterized in that: said heavy coal discharge system comprises a plurality of heavy coal apothecas (3), and the bottom of each heavy coal apotheca (3) is equipped with intermittently blow-off valve (4) of a heavy coal; Be furnished with the airduct (9) of arranging in said each heavy coal apotheca (3); Said wind-distributing pipe (9) downside has a series of cloth wind apertures (10); Said wind-distributing pipe (9) is realized air distribution by air compartment (8), and said air compartment (8) is arranged at each heavy coal apotheca (3) outside; Said air compartment (8) links to each other with air supply device through pipeline.

2. a kind of fluid bed dry coal preparation equipment according to claim 1 is characterized in that: said exhaust outlet comprises first exhaust outlet (6a) and second exhaust outlet (6b); Be divided into first coal feed point (2a) and second coal feed point (2b) by dividing plate in the middle of the said coal feed point (2); Said first exhaust outlet (6a) is connected through the side of pipeline with first coal feed point (2a), and the gas of discharge vertically passes first coal feed point (2a) and discharges from opposite side; Said second exhaust outlet (6b) is connected through the side of pipeline with second coal feed point (2b), and the gas of discharge vertically passes second coal feed point (2b) and discharges from opposite side.

3. a kind of fluid bed dry coal preparation equipment according to claim 1 and 2, it is characterized in that: the spacing between the said wind-distributing pipe (9) is 50-300mm; The diameter of said cloth wind aperture (12) is 5-30mm.

4. a kind of fluid bed dry coal preparation equipment according to claim 1 and 2 is characterized in that: said air feed system (10) feeds hot-air or hot flue gas.