CN203534059U - Coal slime drying system - Google Patents
Coal slime drying system Download PDFInfo
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- CN203534059U CN203534059U CN201320473997.3U CN201320473997U CN203534059U CN 203534059 U CN203534059 U CN 203534059U CN 201320473997 U CN201320473997 U CN 201320473997U CN 203534059 U CN203534059 U CN 203534059U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
The utility model provides a coal slime drying system. The coal slime drying system comprises a scattering pre-drying machine, a low temperature drying furnace, a forming machine, a dust removing device and a heat supplying device for supplying hot air with the temperature lower than 250 DEG C to the scattering pre-drying device and the low temperature drying furnace, the scattering pre-drying device is connected with the low temperature drying furnace, the upper portion of the low temperature drying furnace is connected with the dust removing device through an exhaust pipeline, the lower portion of the low temperature drying furnace is connected with the forming machine, and the heat supplying device is respectively connected with the scattering pre-drying machine and the low temperature drying furnace through heat supplying pipelines. The coal slime drying system is safe to operate, high in efficiency, free of pollution and large in throughput.
Description
Technical field
The utility model relates to wet coal slime technical field of drying, relates in particular to a kind of coal slime low temperature drying system and coal slime low temperature drying new technology.
Background technology
Approximately 200,000,000 tons of the annual coal slime output in the whole nation.Along with the exploitation year by year of coal, the meager coal that in coal reserves, spoil content is high is more and more, and coal preparation plant builds more and more, and coal slime output is also increasing.Coal slime self-characteristic: its particle is little, moisture is large, content of ashes is high, calorific capacity is low, be unfavorable for burning; Wet glutinous, adhesion is unfavorable for transportation; Low, the easy spontaneous combustion blast of burning-point; Coal slime is stacked and to be taken a large amount of places, and the coal slime of strong wind weather dry tack free is flown upward all over the sky, the rainy day causes a large amount of coal slimes to run off owing to washing away, and environmental pollution is serious.How turning waste into wealth, develop cheap coal slime dry technology, is the problem that the sustainable development of coal in China industry must solve as early as possible.
Existing routine mainly contains following two kinds to the processing method of coal slime:
1, directly or through stacking airing be blended into cleaned coal or the take-away of middle coal after washing.Moisture and the content of ashes that has increased mixed coal taken out in blending, not only reduces the calorific capacity of coal, reduces the thermal efficiency of coal-burning boiler simultaneously.Along with power plant and with coal unit management scientific, become more meticulous and the implementing gradually of energy-saving and emission-reduction, Yong Mei unit all resists blending coal slime in coal, blending is taken out unworkable gradually.
2, directly take out at a low price.Take out and not only reduce coal slime as the utilization ratio of coal at a low price, and cause very large economic loss to coal washing enterprise.
In order to improve value and the economic benefit of coal slime, coal washery is all in dry new technology, the new technology of the various coal slimes of exploitation both at home and abroad.
Existing coal slime dry technology is mainly by following three kinds:
1, natural drying method: this is that traditional coal slime drying and dehydrating method of getting off is followed in coal washery always.Filter press coal slime out in coal washery is transported to airing field by belt conveyor, by weather-drying moisture.Airing removes after part moisture to coal slime, and coal slime loses original sticky stickiness cleaned coal or middle coal that blending is entered after washing again after loose that start to become and takes out by coal price, or directly takes out at a low price.
2, cylinder high temperature drying technology: this technology is the new technology of utilizing the dry coal slime of drying machinery that developed recently gets up, this technology is that filter press coal slime out in coal washery is transported to roller drier by belt conveyor, build a special hot air stove generation high-temperature hot-air and send into roller drier together with wet glutinous coal slime, dried coal slime removes the moisture of 10% left and right, and coal slime calorific value is improved.
3, microwave drying technology: this is a kind of new technology at the early-stage, has overcome the difficult problem that coal slime bonding is awkward, and adapts to widely, and drying efficiency is high, easy and simple to handle.On probation just at home and abroad at present.
But above-mentioned coal slime dry technology has following shortcoming:
1, the shortcoming of natural drying method:
Natural packing airing floor space is large, the cycle is long, can only surface obtain drying and dehydrating, inside can not get airing; Spreading thin layer airing out needs large-area cement flooring, needs to go along with sb. to guard him facility around.Natural drying cannot be changed by weather restraining factors, and rainy weather not only can not be deviate from moisture, and again waters into a large amount of new moisture.
Disadvantage is a large amount of losses of coal slime and the severe contamination of environment.After coal slime is dry, be fine powdery, run into the weather of blowing, superfine pulverized coal flies upward everywhere; Run into rainy weather and trickled by rain drop erosion everywhere, not only wet coal slime runs off in a large number, and surrounding environment is caused to long-term severe contamination.
2, the shortcoming of roller drying technology:
There is the danger of blast in cylinder high temperature drying.Roller drying mostly adopts 650 ℃ of-800 ℃ of high-temperature hot-airs of hot-blast stove generation to be dried in order to improve drying efficiency, oxygen content in necessary strict index drum back segment hot blast temperature and hot blast, otherwise, because dried dry pulverized coal burning-point is low, soot dust granule is thin, easily catch fire, once reach explosion limit, easily set off an explosion.Owing to there is potential safety hazard, most coal washery dare not be used.
3, the shortcoming of microwave drying technology:
Although microwave drying is applicable to dehydrating of wet glutinous coal slime, the generation of microwave needs valuable secondary energy sources-electric energy.Wet coal slime per ton removes 15% moisture needs electric energy more than 135Kw, and wet coal slime drying cost per ton is more than 80 yuan/ton, be other coal-fired dry 3-4 doubly.Therefore, the energy consumption cost of microwave drying is high, and with the high-quality secondary energy sources after conversion, removing the primary energy of dry low-quality is to put the cart before the horse.
Utility model content
Utility model object of the present utility model is to overcome defect of the prior art, a kind of handling safety is provided, saves the energy, coal slime drying system simple to operate.
The technical solution of the utility model provides a kind of coal slime drying system, comprise break up predryer, low temperature drying stove, forming machine, dust arrester and to described predryer and the described low temperature drying stove broken up for the heating plant of hot blast below 250 ℃, the described predryer of breaing up is connected with described low temperature drying stove, the top of described low temperature drying stove is connected with described dust arrester by discharge duct, the bottom of described low temperature drying stove is connected with described forming machine, and described heating plant is connected with described low temperature drying stove with the described predryer of breaing up respectively by heat supply pipeline.
Further, described heating plant is hot-blast stove, between described hot-blast stove and described dust arrester, is also connected with the pulverized coal channel that enters described hot-blast stove for the dry pulverized coal in described dust arrester.
Further, described heating plant is power plant's low temperature exhaust heat reclaimer, comprise power plant's air-introduced machine, power plant's flue, air blast and waste gas fairlead, the output of described power plant air-introduced machine and described power plant flue join, one end of described waste gas fairlead is connected in described power plant flue, the other end of described waste gas fairlead and described air blast join, and the output of described air blast is broken up predryer and described low temperature drying stove joins with described respectively by heat supply pipeline.
Further, described in to break up predryer be double helix drying machine, described double helix drying machine comprises drying, is provided with side by side two screw rods of running in opposite directions in described drying.
Further, described low temperature drying stove is vertical multi-layer fluidized drying stove, described vertical multi-layer fluidized drying stove comprises dry body of heater, on described dry body of heater, be provided with charging aperture, discharging opening, exhaust outlet and hot blast import, in described dry body of heater, be provided with the multicompartment fluidized bed being obliquely installed for wet coal slime heating and walking.
Further, described forming machine is twin rollers, and described twin rollers comprises the running roller and a vertical screwdown gear of two opposite direction rotatings.
Further, described discharge duct is also provided with return air duct with being connected between the heat supply pipeline of described low temperature drying stove.
Adopt technique scheme, there is following beneficial effect:
A kind of coal slime drying system that the utility model provides, handling safety, can not catch fire or explosion accident, and the efficiency of heating surface is high, is applicable to large-scale continuous production.Because the burning-point of many coals is mostly 200 ℃ of left and right.Hot blast in the utility model is controlled at below 250 ℃, and coal dust temperature is controlled at below 80 ℃, avoids coal dust to blast when explosive range.Simultaneously, the hot blast that low temperature drying fire grate is gone out is mixed and in hot blast, is controlled temperature by a return air duct loopback part, no longer mix fresh air, therefore, hot blast in low temperature drying stove is all the flue gas after burning, and wherein oxygen content is all below 12%, though coal dust content in explosive range, temperature also reaches ignition temperature, due to the anoxic accident of still can not blasting, further ensured handling safety.
A kind of coal slime drying system that the utility model provides, had just been broken up before wet coal slime enters low temperature drying stove that predryer is broken up, predry, no longer sticked together, the phenomenon of the group of rolling, and had improved the drying oven service efficiency of rear step drying process.
A kind of coal slime drying system that the utility model provides, can be used low-temperature industrial used heat as the dry thermal source of coal slime, for low temperature heat and recycling economy development provide a kind of brand-new pattern from now on.Adopt industrial waste heat not consume any primary energy, no longer produce unnecessary toxic emission, protected the mankind's living environment.
Accompanying drawing explanation
The schematic diagram of the first embodiment of a kind of coal slime drying system that Fig. 1 provides for the utility model;
The schematic diagram of the second embodiment of a kind of coal slime drying system that Fig. 2 provides for the utility model;
Fig. 3 is the schematic diagram of boiler low-temperature waste heat recovery apparatus;
Fig. 4 is the schematic diagram of double helix drying machine;
Fig. 5 is the schematic diagram of vertical multi-layer sulfuration drying oven;
Fig. 6 is the schematic diagram of twin rollers.
The Reference numeral table of comparisons:
1-breaks up predryer; 2-low temperature drying stove; 3-heating plant;
4-dust arrester; 5-forming machine; 6-storage bin;
7-discharge duct; 8-heat supply pipeline; 9-return air duct;
10-pulverized coal channel; 11-drying; 12-screw rod;
13-screw rod; 21-is dried body of heater; 22-charging aperture;
23-exhaust outlet; The import of 24-hot blast; 25-discharging opening;
26-fluid bed; 27-material whereabouts passage;
31-hot-blast stove; 32-boiler low-temperature waste heat recovery apparatus;
321-power plant air-introduced machine; 322-power plant flue; 323-air blast;
324-waste gas fairlead; 325-chimney of electric plant; 51-twin rollers housing;
52-running roller; 53-running roller; The 100-coal slime that wets.
The specific embodiment
Below in conjunction with accompanying drawing, further illustrate the specific embodiment of the present utility model.
As shown in Figure 1, a kind of coal slime drying system that the utility model provides, comprise and break up predryer 1, low temperature drying stove 2, forming machine 5, dust arrester 4 and to breaing up predryer 1 and low temperature drying stove 2 heating plant 3 for hot blast below 250 ℃, this is broken up predryer 1 and is connected with low temperature drying stove 2, the top of low temperature drying stove 2 is connected with dust arrester 4 by discharge duct 7, the bottom of low temperature drying stove 2 is connected with forming machine 5, heating plant 3 by heat supply pipeline 8 respectively with break up predryer 1 and be connected with low temperature drying stove 2.
Break up predryer 1 for wet coal slime 100 is broken up and preliminarily dried predry; Low temperature drying stove 2 is for to through breaing up, predryer 1 is broken up and the wet coal slime 100 of preliminary predry is carried out low temperature rapid draing; Forming machine 5 is for carrying out moulding to the dry pulverized coal forming after 2 low temperature dryings of low temperature drying stove; Dust arrester 4 reclaims for the coal ash that low temperature drying stove 2 is discharged; Heating plant 3 is for to breaing up predryer 1 and low temperature drying stove 2 for hot blast below 250 ℃.
The burning-point of coal dust is mostly 200 ℃ of left and right, the utility model is controlled at the temperature of hot blast below 250 ℃, and the temperature of the burner hearth of low temperature drying stove 2 is controlled between 150 ℃-200 ℃, wet coal slime 100 temperature in low temperature drying stove 2 in low temperature drying are controlled at below 80 ℃, use 650 ℃ of-800 ℃ of high-temperature hot-airs to compare with traditional drying means, the hot blast that the utility model is used and the temperature of burner hearth are significantly less than traditional handicraft, therefore drying oven is referred to as to low temperature drying stove, whole coal slime drying system can be referred to as coal slime low temperature drying system, the coal slime drying process of subsequent detailed also can be referred to as coal slime low temperature drying technology.By hot blast temperature being controlled at below 250 ℃, can avoid coal dust to explode in drying oven 2, ensured the safety of dry run.
This is broken up predryer 1 and is connected with low temperature drying stove 2 by the belt on belt feeder, for by through breaing up, predryer 1 is broken up and the wet coal slime of preliminary predry 100 input low temperature drying stoves 2.
The top of low temperature drying stove 2 is connected with dust arrester 4 by discharge duct 7, for the waste gas of low temperature drying stove 2 is discharged.This dust arrester 4 comprises two-stage dedusting, and first order dedusting is gravitational dust collection or cyclone dust removal, makes coal dust lean on centrifugal action separation from exhaust of self gravitation or whirlwind to fall; Second level dedusting is bag-type dust, and the filter bag of sack cleaner adopts the filter cloth of weaving or nonwoven felt to become, and utilizes the filtration of fabric to filter dusty gas.When dusty gas enters sack cleaner, large, the heavy dust of particle, because the effect of gravity settles down, falls into ash bucket, contains compared with the gas of fine dusts when by filtrate, and dust, by detention, is purified gas.After two-stage dedusting, the waste gas of discharge reaches the discharge standard of national regulation completely, avoids exhaust emission atmosphere, has protected environment.
The bottom of low temperature drying stove 2 is connected with forming machine 5 by airtight ribbon conveyer, for being delivered to and being carried out moulding in forming machine 5 by airtight ribbon conveyer by the dried coal dust of low temperature drying stove 2.After forming machine 5 is processed into spheric granules by dry pulverized coal, then in belt feeder input storage bin 6, in order to follow-up use.
Heating plant 3 by heat supply pipeline 8 respectively with break up predryer 1 and be connected with low temperature drying stove 2, for to breaing up predryer 1 and low temperature drying stove 2 is supplied with hot blast below 250 ℃.
This coal slime drying system integral body is closed system, and its hot blast is entirely flue gas, does not mix any new fresh oxygen, and in its hot blast, the content of oxygen is less than 12%(volume ratio).Burning three elements: fuel, oxygen and temperature.The utility model is controlled two key elements in three elements: hot blast temperature and oxygen content are to guarantee safe powerful measure.In the utility model, be dried and be limited in below 250 ℃ with hot blast, fire box temperature is 150 ℃ of-200 ℃ of left and right, and this temperature, lower than the burning-point of most of coals, is the first element of realizing safety in production.The hot blast that the utility model is used is all combustion product gases, does not mix any fresh air, strictly controls oxygen content in hot blast and is less than 12%(volume ratio), be the second key element that realizes safety in production.By above double insurance, even if fine breeze can not set off an explosion in explosion limit scope yet.
As shown in Figure 2, above-mentioned heating plant 3 can be hot-blast stove 31, is also connected with the pulverized coal channel 10 that enters hot-blast stove 31 for the dry pulverized coal in dust arrester 4 between this hot-blast stove 31 and dust arrester 4.During hot-blast stove 31 starting, adopt outside coal as fuel, after whole system operation, adopt the dry pulverized coal that discharge dust arrester 4 or sack cleaner bottom to pass through pulverized coal channel 10 as the fuel of hot-blast stove 31, by fine coal nozzle, dry pulverized coal is sprayed into the interior burning of hot-blast stove 31, flue gas after burning is as the hot blast of whole coal slime drying system, and after this hot blast mixes with return air, temperature is controlled at below 250 ℃.This hot blast is sent into respectively to low temperature drying stove 2 each bringing-up sections by air blast, the heating of wet coal slime 100 from top to down being carried out to one-level one-level by vibrating bed or fluid bed removes moisture, meet the requirements of delivering dry coal slurry and discharge from the bottom of low temperature drying stove 2, enter in forming machine 5.Send into after the wet coal slime 100 of Hot-blast Heating of low temperature drying stove 2, its temperature can reduce, hot blast after temperature reduces is extracted out by air-introduced machine with together with steam from evaporating wet coal slime 100, a part is sent back to the heat supply pipeline 8 of hot-blast stove 31 and the flue gas of hot-blast stove 31 and is mixed into the hot blast that low temperature drying stove 2 needs, and another part is directly discharged into atmosphere after by dust arrester 4 dedustings.It can realize waste gas circulation utilization, has saved material, and has avoided dry pulverized coal to enter atmosphere pollution environment.
As shown in Figure 3, above-mentioned heating plant 4 can be also power plant's low temperature exhaust heat reclaimer 32, comprise power plant's air-introduced machine 321, power plant's flue 322, air blast 323 and waste gas fairlead 324, the output of power plant's air-introduced machine 321 and power plant's flue 322 join, one end of waste gas fairlead 324 is connected in power plant's flue 322, the other end of waste gas fairlead 324 and air blast 323 join, the output of air blast 323 by heat supply pipeline 8 respectively with break up predryer 1 and low temperature drying stove 2 joins.Adopting power plant's low temperature exhaust heat as thermal source, not only save coal, and do not increase any toxic emission, is the best mode of circle economy of coal industry development.
The heat of boiler of power plant low-temperature flue gas waste heat accounts for 10% left and right of boiler gross heat input.The desulphurization denitration of boiling boiler generally carries out in boiler furnace, and desulfurizer is no longer set on flue, therefore, and the flue-gas temperature higher (generally 120 ℃ of left and right) that enters chimney.The desulfuring and denitrifying apparatus of pulverized-coal fired boiler is arranged on flue, therefore, from desulfuring and denitrifying apparatus flue-gas temperature out mostly at 70 ℃～80 ℃.
Boiler of power plant smoke evacuation, through entering deduster after economizer, air heat exchanger, enters chimney of electric plant 325 from deduster flue gas out through air-introduced machine 321Jing power plant of power plant flue 322.The hot blast of boiler low-temperature waste heat recovery apparatus 32 extracts from power plant's air-introduced machine 321 power plant's flue 322 below, extracts on pipeline electric flashboard is housed, and according to drying system, requires flow automatic regulation.Boiler low-temperature waste heat recovery apparatus 32 flows to hot blast to break up predryer 1 and low temperature drying stove 2 by heat supply pipeline 8 again, to be dried utilization.
This boiler low-temperature waste heat recovery apparatus 32 is applicable to away from city, is seated the power plant in meagrely-populated Desert Area.Due to meagrely-populated, away from city, Gai Chu power plant exists a large amount of low temperature exhaust heats not develop, and after waste heat recovery, also utilizes nowhere.This boiler low-temperature waste heat recovery apparatus 32 is dry near the coal slime of coal washery after the low-temperature flue gas of power plant can being reclaimed, utilize low temperature exhaust heat can save all dry needed hot-blast stove fire coals, not only save coal, and do not increase any toxic emission, be the best mode of circle economy of coal industry development.
As shown in Figure 4, the above-mentioned predryer of breaing up is double helix drying machine, and this double helix drying machine comprises drying 11, is provided with side by side two screw rods (12,13) of running in opposite directions in drying 11.Screw rod 12 and screw rod 13 are arranged in drying 11 side by side, and the rotation direction of screw rod 12 and screw rod 13 is contrary, i.e. running in opposite directions.In drying 11, pass into above-mentioned hot blast, the screw rod 12 that wet glutinous coal slime is turned round in opposite directions in double helix drying machine and the stirring of screw rod 13, extruding are advanced and are heated dryly, have chopping and clearing function mutually between screw rod 12 and screw rod 13 simultaneously.
The above-mentioned predryer of breaing up is double helix drying machine, also can adopt inclination drum type brake to break up dryer, and wet glutinous coal slime is stirred, breaks up and heat by special entity in passing into the cylinder of above-mentioned hot gas, and coal slime moves forward by the gravity that tilts to produce in agitation.
As shown in Figure 5, above-mentioned low temperature drying stove 2 is vertical multi-layer fluidized drying stove, vertical multi-layer fluidized drying stove comprises dry body of heater 21, on dry body of heater 21, be provided with charging aperture 22, discharging opening 25, exhaust outlet 23 and hot blast import 24, in dry body of heater 21, be provided with the multicompartment fluidized bed being obliquely installed 26 for wet coal slime 100 fluidisations walking.
These low temperature drying stove 2 furnace roofs have hermetically-sealed construction and vibrations feeding structure.Above-mentioned charging aperture 22 and break up and be provided with belt feeder and elevator between predryer 1, the belt feeder coal slime 100 that will wet together with elevator is transported to charging aperture 22.Between above-mentioned discharging opening 25 and forming machine 5, belt feeder is set, by belt feeder, dry pulverized coal is transported to forming machine.Above-mentioned exhaust outlet 23 is connected with dust arrester 4 by discharge duct 7.Above-mentioned hot blast import 24 is connected with heating plant 3 by heat supply pipeline 8.Hot blast import 24 is arranged on the below of dry body of heater 21, is beneficial on hot blast and moves, and is beneficial to wet coal slime 100 is carried out to drying and dehydrating.
Vertical multi-layer fluidized drying stove 2 is provided with multicompartment fluidized bed 26 in dry body of heater 21.On this multicompartment fluidized bed 26, arrange to have and permitted lacunary air distribution plate, hot blast can blow afloat into fluidized state by coal slime by aperture, and coal slime 100 is dried and removes moisture content at fluidized state and the abundant contact heat-exchanging of hot blast.Multicompartment fluidized bed increases the stroke of wet coal slime 100 in dry body of heater 21, so that guarantee can be by the moisture removal in wet coal slime 100 under low temperature condition, what this multicompartment fluidized bed 26 all tilted is arranged in dry body of heater 21, and interlaced arrangement between two adjacent fluid beds 26, wet coal slime 100 is "the" shape and moves down in drying oven.Shown in Fig. 5, the left side of fluid bed 26 and dry body of heater 21 join, and its right-hand member does not join with dry body of heater 21, but leave a material whereabouts passage 27, and wet coal slime 100 can fall by this material whereabouts passage 27.Dry body of heater 21 is set to vertical, and multistage multicompartment fluidized bed 26 can be set, and utilizes vertical multi-stage track route to increase the walking distance of wet coal slime 100 in dry body of heater 21.Wet coal slime 100 is carried out to fluidisation, fluidisation makes wet coal slime 100 have larger heating surface area simultaneously.The hot blast of Wind Volume high flow rate has increased the convective heat-transfer coefficient between hot gas and wet coal slime 100, and multicompartment fluidized bed 26 has increased the drying time in dry body of heater 21 of wet coal slime 100, and low temperature (hot blast temperature is lower than 250 ℃) has guaranteed the security of operation.
Above-mentioned low temperature drying stove 2 can adopt various ways, as long as meet low wind-warm syndrome, low temperature of charge, three conditions of high efficient heat exchanging.For example: the drum kiln of vibrating mixed flow drying oven, special construction, fluidized bed drying stove etc. all can be realized above-mentioned functions.
As shown in Figure 6, above-mentioned forming machine 5 is twin rollers, and this twin rollers 5 comprises the running roller (52,53) of two opposite direction rotatings.On pair roller, be processed with semicircle pit.Twin rollers 5 comprises twin rollers housing 51, is provided with the running roller of two opposite direction rotatings in twin rollers housing 51, is respectively running roller 52 and running roller 53, running roller by motor be connected with pair roller to gear drive.Novel additive-free nodulizer also have with to the vertical pressue device of rod, for reinforcing, coal dust is pressed into twin rollers, realize the moulding of coal dust binder free.The dry pulverized coal coming from the transmission of vertical multi-layer fluidized drying stove enters twin rollers through feeding device, and twin rollers is pressed into dry pulverized coal in the semi-circular pit between two running rollers (52,53), by pair roller extrusion modling with pressure.Moulded coal after moulding is avoided dust pollution in transportation and reprocessing process, to coal slime, recycles the condition of providing convenience.
As depicted in figs. 1 and 2, above-mentioned discharge duct 7 is also provided with return air duct 8 with being connected between the heat supply pipeline 8 of low temperature drying stove 2.In dry wet coal slime 100 processes, the exhaust in low temperature drying stove 2 or waste gas or dust are expelled to dust arrester 4 through discharge duct 7.In said process, the waste gas of some discharge or flue gas (return and mix wind) are transmitted back in heat supply pipeline 8 and are mixed with hot-blast stove smoke evacuation by backwind tube, by thermometric and control system, regulate mixed proportion to obtain final required hot blast, again this hot blast is sent into respectively to low temperature drying stove 2 each bringing-up sections by air blast, realize being dried wet coal slime 100.Thus, it can make part waste gas be recycled, and does not need to rejoin air, can guarantee dry safety, has improved again heat utilization rate, saves the energy.
As can be seen here, a kind of coal slime drying system that the utility model provides, simple in structure, easy to operate, security of operation, and the problem of the operation difficult brought to drying equipment of wet glutinous, the adhesion that have solved coal slime, eliminated the unsafe problems that may explode that high temperature drying is come to coal slime dry zone, solve the dry loss causing of coal slime and to surrounding environment bring pollution problem, solved problem that low temperature drying heat exchange efficiency is low, solved the problem that the low temperature exhaust heat of power plant is recycled, be a kind of energy-conservation, efficient, safe novel dried system.
The drying process of wet coal slime, shown in Fig. 1-6, it realizes being dried wet coal slime 100 by above-mentioned coal slime drying system.
It comprises the steps:
Step 1: open heating plant 4 to breaing up predryer 1 and low temperature drying stove 2 for the hot blast below 250 ℃;
Step 2: the coal slime that will wet 100 is broken up in predryer 1 by belt input, enters the wet coal slime 100 of breaing up in predryer 1 and is shredded, breaks up, and makes wet coal slime preliminary hydro-extraction to loose condition (of surface) by the hot blast entering simultaneously;
Step 3: the wet coal slime 100 of loose condition (of surface) is inputted in low temperature drying stove 2 by belt, and wet coal slime 100 moves down at the interior multicompartment fluidized bed 26 in low temperature drying stove 2 of low temperature drying stove 2, and dehydration is dry pulverized coal;
Step 4: above-mentioned dry pulverized coal is transported to forming machine 5 through the discharging opening 25 of low temperature drying stove 2;
Step 5: after dry pulverized coal is processed into spheric granules by forming machine 5, then through belt input storage bin 6.
Above-mentioned breaing up can arrange the devices such as belt feeder and the elevator coal slime 100 that will wet and send in low temperature drying stove 2 between predryer 1 and low temperature drying stove 2.Between above-mentioned low temperature drying stove 2 and forming machine 5, the devices such as belt feeder are set dry pulverized coal is transported to forming machine.
In above-mentioned hot blast, the content of oxygen is less than 12%(volume ratio), the temperature of the burner hearth of described low temperature drying stove is between 150 ℃-200 ℃.Guarantee dry run security of operation, can not blast, this coal slime drying process carries out in closed system, and its hot blast is entirely flue gas, does not mix any new fresh oxygen, and in its hot blast, the content of oxygen is less than 12%(volume ratio).Burning three elements: fuel, oxygen and temperature.The utility model is controlled two key elements in three elements: hot blast temperature and oxygen content are to guarantee safe powerful measure.In the utility model, be dried and be limited in below 250 ℃ with hot blast, coal slime temperature is below 80 ℃, and this temperature, lower than the burning-point of most of coals, is the first element of realizing safety in production.The hot blast that the utility model is used is all combustion product gases, does not mix any fresh air, strictly controls oxygen content in hot blast and is less than 12%(volume ratio), be the second key element that realizes safety in production.By above double insurance, even if fine breeze can not set off an explosion in explosion limit scope yet.
As can be seen here, the coal slime drying process that the utility model provides, handling safety, efficiency is high, pollution-free, output is large, can also realize the recycling of low-temperature industrial waste heat.
Above-described is only principle of the present utility model and preferred embodiment.It should be pointed out that for others skilled in the art, on the basis of the utility model principle, can also make some other modification, also should be considered as protection domain of the present utility model.
Claims (7)
1. a coal slime drying system, is characterized in that, comprise break up predryer, low temperature drying stove, forming machine, dust arrester and to described predryer and the described low temperature drying stove broken up for the heating plant of hot blast below 250 ℃,
The described predryer of breaing up is connected with described low temperature drying stove, the top of described low temperature drying stove is connected with described dust arrester by discharge duct, the bottom of described low temperature drying stove is connected with described forming machine, and described heating plant is connected with described low temperature drying stove with the described predryer of breaing up respectively by heat supply pipeline.
2. a kind of coal slime drying system according to claim 1, is characterized in that, described heating plant is hot-blast stove, between described hot-blast stove and described dust arrester, is also connected with the pulverized coal channel that enters described hot-blast stove for the dry pulverized coal in described dust arrester.
3. a kind of coal slime drying system according to claim 1, it is characterized in that, described heating plant is boiler low-temperature waste heat recovery apparatus, comprise power plant's air-introduced machine, power plant's flue, air blast and waste gas fairlead, the output of described power plant air-introduced machine and described power plant flue join, one end of described waste gas fairlead is connected in described power plant flue, the other end of described waste gas fairlead and described air blast join, and the output of described air blast is broken up predryer and described low temperature drying stove joins with described respectively by described heat supply pipeline.
4. according to a kind of coal slime drying system described in claim 2 or 3, it is characterized in that, described in to break up predryer be double helix drying machine, described double helix drying machine comprises drying, is provided with side by side two screw rods of running in opposite directions in described drying.
5. a kind of coal slime drying system according to claim 4, it is characterized in that, described low temperature drying stove is vertical multi-layer fluidized drying stove, described vertical multi-layer fluidized drying stove comprises dry body of heater, on described dry body of heater, be provided with charging aperture, discharging opening, exhaust outlet and hot blast import, in described dry body of heater, be provided with the multicompartment fluidized bed being obliquely installed for wet coal slime fluidisation and walking.
6. a kind of coal slime drying system according to claim 5, is characterized in that, described forming machine is twin rollers, and described twin rollers comprises the running roller of two opposite direction rotatings.
7. a kind of coal slime drying system according to claim 6, is characterized in that, described discharge duct is also provided with return air duct with being connected between the heat supply pipeline of described low temperature drying stove.
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| CN201320473997.3U CN203534059U (en) | 2013-08-05 | 2013-08-05 | Coal slime drying system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103528342A (en) * | 2013-08-05 | 2014-01-22 | 神华集团有限责任公司 | Coal slime drying system and coal slime drying process |
| CN104119980A (en) * | 2014-08-04 | 2014-10-29 | 江苏鹏飞集团股份有限公司 | Device and method thereof for drying wet-based coal at low temperature with low oxygen |
| CN104848674A (en) * | 2015-05-18 | 2015-08-19 | 上海褐美能源科技有限公司 | Coal mine low concentration gas oxidation high temperature hot air and coal slime preparing and drying technology |
| CN106091578A (en) * | 2016-06-20 | 2016-11-09 | 河南皓佳农业开发有限公司 | A kind of infrared dewatering process of material |
| CN112254496A (en) * | 2020-09-25 | 2021-01-22 | 榆林学院 | Coal slime collection device |
-
2013
- 2013-08-05 CN CN201320473997.3U patent/CN203534059U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103528342A (en) * | 2013-08-05 | 2014-01-22 | 神华集团有限责任公司 | Coal slime drying system and coal slime drying process |
| CN104119980A (en) * | 2014-08-04 | 2014-10-29 | 江苏鹏飞集团股份有限公司 | Device and method thereof for drying wet-based coal at low temperature with low oxygen |
| CN104848674A (en) * | 2015-05-18 | 2015-08-19 | 上海褐美能源科技有限公司 | Coal mine low concentration gas oxidation high temperature hot air and coal slime preparing and drying technology |
| CN106091578A (en) * | 2016-06-20 | 2016-11-09 | 河南皓佳农业开发有限公司 | A kind of infrared dewatering process of material |
| CN106091578B (en) * | 2016-06-20 | 2018-05-08 | 河南皓佳农业开发有限公司 | A kind of infrared dewatering process of material |
| CN112254496A (en) * | 2020-09-25 | 2021-01-22 | 榆林学院 | Coal slime collection device |
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