CN205747872U - The air stove material-returning device of brown coal system of processing - Google Patents

Abstract

The air stove material-returning device of a kind of brown coal system of processing, including whirlwind collector, cloth bag collection machine, main induced draft fan, air stove, is characterized in that the discharging opening of whirlwind collector is connected to discharging drag conveyor；The outlet of sack cleaner connects cloth bag rewinding auger, and the port of export of cloth bag rewinding auger is connected to dynamic feeding chamber；Separately connecting the charging aperture of fuel cyclone dust extractor at whirlwind collector discharging opening by suction tube, the discharging opening of this cyclone dust extractor is connected to dynamic feeding chamber；Arranging two conveying worms in dynamic feeding chamber, a discharging opening at dynamic feeding chamber leads to discharging drag conveyor, and another discharging opening leads to the fuel inlet of air stove.This utility model has will pulverize the coal dust after drying, and automatic returning charge is to the function of air stove feed, it is achieved fuel is self-supporting, and reduces for combustion equipment, simplifies equipment.

Description

The air stove material-returning device of brown coal system of processing

Technical field

This utility model belongs to a kind of coal drying plant, the air stove material-returning device of a kind of brown coal system of processing.

Background technology

Brown coal are the main fuels in current thermal power plant, due to raw coal moisture content higher (reaching more than 40%), and lumpiness, in order to give full play to exerting oneself of electromotor, brown coal must be pulverized, dry and make its granularity reach less than 5 millimeters, aqueous less than 15%.At present, it is first to pulverize with pulverizer to be dried machine drying more mostly, dries and generally use roller drier.Prior art has the drawback that: complex process, floor space are big, cost is high, operating cost is high.Dry the deficiency that can overcome above-mentioned technology as used the air stove air feed with brown coal powder as fuel to carry out, such as fluidized bed furnace, i.e. cartridge type bottom of furnace body is equipped with some ventilators.Wind is blown into from bottom blast cap side opening, and fuel coal dust puts into from furnace roof portion, burns in stove, and the flue gas of generation is to drying machine heat supply.But

The shortcoming of fluidized bed furnace: be first ignition difficulties, needs separately to add the material that ignites and is heated to brown coal burning-point and just can ignite.Suddenly shut down in particularly working, again ignite more difficult.

Utility model content

The purpose of this utility model is to provide the air stove material-returning device of a kind of brown coal system of processing, has and will pulverize the coal dust after drying, automatically gives the function of air stove feed, and technique simplifies, reduces floor space, reduces cost and operating cost.

The technical scheme that this utility model provides is: include whirlwind collector, cloth bag collection machine, main induced draft fan, air stove, it is characterized in that: the outlet of whirlwind collector air inducing connects the air inducing entrance of sack cleaner, and the discharging opening of whirlwind collector is connected to discharging drag conveyor by airlock；The outlet of sack cleaner connects cloth bag rewinding auger, and the port of export of cloth bag rewinding auger is connected to dynamic feeding chamber by airlock；The another charging aperture being connected fuel cyclone dust extractor in the airlock rear end of whirlwind collector discharging opening by suction tube, the discharging opening of this cyclone dust extractor is connected to dynamic feeding chamber by airlock；Two conveying worms of forward and reverse operating are set in dynamic feeding chamber, tail end at two conveying worms respectively arranges discharging opening, one discharging opening leads to discharging drag conveyor, and another discharging opening leads to the fuel inlet of air stove by fuel airlock and converying feeding tube；The air inducing outlet of sack cleaner connects the chimney returning wind pipeline connection air stove by air-introduced machine, returns to arrange on wind pipeline and returns air valve.

Good effect of the present utility model: having and will pulverize the coal dust after drying, automatic returning charge is to the function of air stove feed, it is achieved fuel is self-supporting, and reduce for combustion equipment, simplify equipment, reduce floor space, reduce investment outlay, reduce operating cost.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model.

Fig. 2 is beater grinder structural representation.

Fig. 3 is air stove structural representation.

Fig. 4 is lower portion of furnace body structure enlarged diagram.

Fig. 5 is the A-A sectional view of Fig. 4.

Fig. 6 is the B-B sectional view of Fig. 4.

Fig. 7 is the C-C sectional view of Fig. 4.

Detailed description of the invention

Seeing Fig. 1-7, the concrete structure of air stove is as follows: body of heater 4 appearance is Plate Welding, and inner lining refractory block arranges the adiabator layer made firm by ramming between refractory brick and outer steel plate；Body of heater 4 bottom layer bottom has natural air inlet mouth 4-1, under outside air-introduced machine effect, and can inspiration combustion air；Having fuel mouth blown 2 at 1.5 meters, bottom, fuel mouth blown connects fuel-supply pipe 35 and fuel blower fan 24, is the combustor 4-3 arranging spray diesel oil at 90 ° with it on the most same circumference；Fuel mouth blown 2 upwards 150 millimeters, each cross section of downward 150 millimeters and downward 450 millimeters are respectively provided with in 180 ° of symmetrical two wind-supplying mouths 3, each wind-supplying mouth 3 is all arranged along inwall tangential direction, each wind-supplying mouth 3, by air channel connecting fan 1, is blown into natural wind.Chimney 7 top, equipped with electric gate valve 8, connects hot air duct 6 bottom smoke exhaust barrel 7, hot air duct 6 exports this mouthful of 6-1(and connects main drying hot air duct) equipped with electric gate valve 5 and temperature detection sensor T1-1；The top of body of heater arranges temperature detection sensor T1.The sidewall of body of heater bottom arranges maintenance fire door 4-2.

Operating process and operation principle: before blow-on, electric gate valve 8 is closed, electric gate valve 5 is crack, and wind-supplying mouth 3 is closed.Outside drying machine main induced draft fan is opened, and natural wind naturally sucks from furnace bottom natural air inlet mouth 4-1, is formed as tiny structure in air stove.Combustor is lighted by bocca 4-3 flame in stove, opens fuel blower fan, is sprayed into by brown coal powder by fuel mouth blown 2.Meet with the combustor column of flame in stove center, burn rapidly.Meanwhile, open electric gate valve 5 and mend blower fan 1.Natural wind and air inducing act on down jointly, make stove fire burn more prosperous and more prosperous, and the column of flame tangentially rotates rising along furnace wall, until the whole after-flame of top fuel.Mending wind due to secondary is that in tangential direction is blown into.Form one layer of cold wind film in furnace wall with the column of flame, reach to prevent the purpose in furnace wall coking.

The outlet temperature detection sensor T1-1 fuel blower fan by fuzzy control instrument control frequency control.According to drying process requirement before start, exported pathogenic wind-warm and demarcated (less than lignite ash melting point 1050 DEG C) slagging prevention, thermo-field thoery, reduce fuel feed, otherwise increase.

See Fig. 1,2, outer housing 32 inwall and top drying baker 34 inwall of beater grinder 33 are made up of abrasion-proof manganese steel plate；

The structure of beater grinder 33 uses prior art, arranges the empty axle 33-2 of a logical supercooled water, and this axle is supported on bearing block 33-1, fixes hammerhead jib 33-3 multiple rows of on axle, and hammerhead jib 33-3 upper end is equipped with replaceable after movable tup 33-4(abrasion)；Casing top is square drying baker 34, and the side of square drying baker 34 is provided with charging aperture 34-1 and hot wind inlet 34-2；Raw material cabin 9 connects charging belt 11, and the tail end of charging belt 11 connects charging aperture 34-1, charging aperture 34-1 arranges airlock 12, and it is Drying 13 that hot wind inlet 34-2 connects hot air furnace hot air outlet 6-1: drying baker 34 top by hot-blast pipe line 6；Drying 13 top is connected with whirlwind collector 14 charging aperture by pipeline, constitutes and pulverizes and drying integral machine.

The outlet of whirlwind collector 14 air inducing connects the air inducing entrance of sack cleaner 18 by induced pipe 16, and the discharging opening of whirlwind collector 14 is connected to discharging drag conveyor 31 by airlock 30；The outlet of sack cleaner 18 connects cloth bag rewinding auger 21, and the port of export of cloth bag rewinding auger 21 is connected to dynamic feeding chamber 23 by airlock 22；The another charging aperture being connected fuel cyclone dust extractor 17 in the rear end of whirlwind collector discharging opening airlock 30 by suction tube, the discharging opening of this cyclone dust extractor is connected to dynamic feeding chamber 23 by airlock 28；Two conveying worm 29-1 and 27 of forward and reverse operating are set in dynamic feeding chamber 23, tail end at two conveying worms respectively arranges discharging opening, one discharging opening 29 leads to discharging drag conveyor 31, and another discharging opening 26 leads to the fuel inlet 2 of air stove by fuel airlock 25 and converying feeding tube 35, fuel conveying fan 24；The air inducing outlet of sack cleaner 18 connects main induced draft fan 20 by air inducing pipeline 19, and the air port of returning of main induced draft fan 20 connects the chimney 7 of air stove by returning airduct 10, returns to arrange on airduct 10 and returns wind-powered electricity generation movable valve 10-1；The air port of returning of main induced draft fan 20 is simultaneously connected with smoke evacuation chimney.The induced pipe of whirlwind collector 14 arranges explosion proof door 15, the induced pipe of the air inducing import and export of sack cleaner 18 arranges explosion proof door F2, F3；On the hot-blast pipe line of drying baker 34 hot wind inlet 34-2, temperature point T2 is set, Drying 13 at drying baker 34 top arranges temperature detection sensor T3 on the connecting line with whirlwind collector 14 charging aperture, and the air inducing import and export pipeline of sack cleaner 18 is respectively provided with temperature detection sensor T4 and T5.These measuring points are all connected with control circuit.

Operation principle:

nullWet coal dust is entered belt material-feeding machine 11 by feeding chamber 9，Drying machine 33 is entered by feeding air seal machinery 12，And herein with the hot blast comprehensive engagement from air stove 4，Pulverizing limit, limit is dried，Material after drying sucks whirlwind collecting machine 14 to carry out expecting that wind separates，Material is discharged by discharging airlock 30，Enter discharging drag conveyor 31，Tail gas enters sack cleaner 18 and discharges，The powder separated is by cloth bag rewinding cage 21、Cloth bag discharging airlock 22 enters dynamic feed bin 23，Material for preventing cloth bag from collecting can not meet the needs of air stove simultaneously，Fuel whirlwind collector 17 can extract a part of fine powder from the feed opening of discharging airlock 30 and enter dynamic feed bin 23 by fuel whirlwind airlock 28，Dynamically feed bin 23 can first ensure the fuel supply of air stove 4，Unnecessary material is then discharged into discharging drag conveyor 31 from top，Dynamically fuel is joined in fuel converying feeding tube 35 by the conveying worm 29-1 in feed bin 23 by fuel airlock 25，Air stove 4 tangentially it is blown into by fuel conveying fan 24，Blower fan 1 combustion-supporting under complete fuel combustion and burn，And form high-temperature flue gas.High-temperature flue gas utilizes furnace roof electrically operated valve 8 and enters in drying baker 34 with after the tail gas mixing homoiothermic returned by hot air duct 6, is used as to dry medium.

Fuel auto-returned system: dynamic feed bin 23 is set, dynamically feed bin 23 top is provided with two charging apertures, two charging apertures are connected with discharging opening and the fuel whirlwind collector 17 suction outlet of sack cleaner 18 by airlock 22,28 respectively, and fuel whirlwind collector 17 import is connected with whirlwind collector 14 discharging opening；Dynamically the top in feed bin 23, bottom be respectively provided with forward and reverse conveying worm 29-1,27, transport screw conveyer 29-1 outlet connects dry product outfeed belt conveyor 31, reverse acting spiral conveyer 27 exports and is connected to air stove fuel mouth blown 2 by airlock 25 and returning charge pipeline 35, sends into air stove as fuel.Its operation principle is: the material that sack cleaner 18 is collected all sends into dynamic feed bin 23 by rewinding auger 21, the siccative that fuel whirlwind collector 17 is collected is also into dynamic feed bin 23, dynamically dry material is sent into revert system by feed bin 23 lower part helical conveyer 27, when dynamic feed bin 23 is full of, unnecessary siccative is entered conveyer 31 by top conveying worm 29-1, to dry brown coal output of products.

Dynamically the returning charge conveying worm 27 of feed bin 23 is driven by frequency control motor, and the temperature signal sent by air stove internal temperature detection sensor T1 controls (control circuit is prior art), it may be assumed that thermo-field thoery slows down, on the contrary speedup.

Native system is anti-burning, blast protection measure and principle:

1, the fuel of air stove is the fine powder (a small amount of finished product siccative) collected from sack cleaner 18 after native system is dried, moisture content is low and is fine powder, spray in stove, under secondary wind and main air inducing effect, burn along the spiral of furnace wall, and body of heater is higher, therefore coal dust can be made fully to burn, not have uncombusted Mars to enter drying machine.

2, for making coal dust fully burn, air stove top flue-gas temperature is the highest (less than the fusing point (1050 DEG C, slagging prevention) of brown coal ash, but to be entered the hot blast temperature of breaking drier, but is inevitably less than brown coal burning-point 400 degree, need to fill into cold wind for this.Simultaneously, for making the oxygen content that in dry run, hot blast oxygen content is ignited less than brown coal, native system uses the tail gas backflow part that drying system is discharged, wind is mended as cooling, for this, cold wind is added before hot blast enters drying machine, make it lower the temperature, for making drying system oxygen content less than brown coal powder ignition amount, take the tail gas (temperature 90 ~ 100 DEG C drying system discharged, oxygen content about 10%), by returning wind pipeline 10, it is blown into air stove top by main induced draft fan 20, air stove outlet pathogenic wind-warm is made to be down to not higher than 400 DEG C, return air quantity and account for the 50% of exhaust emissions amount, controlled by the control valve returned on wind pipeline.

3, interrupt suddenly for anti-locking system feed, cause the pulverizing unexpected temperature rise of drying system, burn the accident of sack cleaner 18, in sack cleaner 18 porch equipped with temperature sensor T4, and demarcated normal running temperature 120 DEG C, once temperature exceeding standard, makes breaking drier import electrically operated valve 5 close by automaton, cuts off thermal source；Air stove overhead electric valve 8 is opened, and makes hot blast enter air thus protects sack cleaner 18.

Claims (1)

1. the air stove material-returning device of a brown coal system of processing,Including whirlwind collector, cloth bag collection machine, main induced draft fan, air stove, it is characterized in that: the outlet of whirlwind collector air inducing connects the air inducing entrance of sack cleaner, and the discharging opening of whirlwind collector is connected to discharging drag conveyor by airlock；The outlet of sack cleaner connects cloth bag rewinding auger, and the port of export of cloth bag rewinding auger is connected to dynamic feeding chamber by airlock；The another charging aperture being connected fuel cyclone dust extractor in the airlock rear end of whirlwind collector discharging opening by suction tube, the discharging opening of this cyclone dust extractor is connected to dynamic feeding chamber by airlock；Two conveying worms of forward and reverse operating are set in dynamic feeding chamber, tail end at two conveying worms respectively arranges discharging opening, one discharging opening leads to discharging drag conveyor, and another discharging opening leads to the fuel inlet of air stove by fuel airlock and converying feeding tube；The air inducing outlet of sack cleaner connects the chimney returning wind pipeline connection air stove by air-introduced machine, returns to arrange on wind pipeline and returns air valve.