CN101519614A - Process for dryness, formation and further processing of water-enriched lignite - Google Patents
Process for dryness, formation and further processing of water-enriched lignite Download PDFInfo
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Abstract
The invention provides a process for dryness, formation and further processing of water-enriched lignite. The process mainly comprises storage of the lignite, material transfer, crushing of lignite grains, rotary drum-shaped body multi-pipe drying, refined crushing, heating, hot pressing forming, screening and material return. The products can be used in process engineering in the fields of transportation, smelting, combustion, power generation or aerification. In the drying process, a rotary drum-shaped body multi-pipe drying device is used, and low-pressure vapor is indirectly used in the drying process, thereby avoiding the explosion due to the reaction of volatile compounds and oxygen, which is caused by too high temperature in the drying process; and in the forming process, little amount of internal water in capillary tubes of the lignite is used as a bonding agent, at certain temperature and grain size and under a certain pressure, gaps between lignite grains are filled by hot pressing so as to strengthen the contact between the lignite grains for forming. Because the hot pressing damages the structure of the capillary tubes of the lignite, the capillary tubes of the lignite are difficult to restore the original spongy property, thereby reducing the secondary adsorption water of the lignite grains. The process has the advantages of improving economic values of the lignite and causing little environmental pollution, along with safe drying and forming process.
Description
Technical field
The present invention relates to be rich in water brown coal upgrading comprehensive high-efficiency and utilize technical field, particularly a kind of water brown coal drying moulding process for upgrading and key equipment thereof of being rich in.After being rich in the water brown coal and handling through broken, dry, moulding upgrading, satisfied usefulness is rich in the requirement that water boiler using brown coal combustion power generation or pure oxygen gasification are produced synthetic raw gas.
Background technology
Owing to contain the moisture of 15wt% one 50wt% in the brown coal, participate in burning or coal gasification directly, in ignition process, need to consume lot of energy on the one hand; Brown coal volatile matter height is blasted easily on the other hand.In addition, because the process of moisture evaporation can be taken away a large amount of heat energy, make that the combustion exhaust gas thermosteresis is big, generating thermo-efficiency is low, and a large amount of dischargings of greenhouse gases and harsh to the gasifying process requirement of brown coal make the use of being rich in the water brown coal face special challenge.The high brown coal of a large amount of exploitation moisture are directly used in burning, not only boiler combustion instability, and also efficient is low.High-moisture makes these coals to use in the locality, can not long-distance transportation, greatly limited the exploitation scale of coal.Therefore, exploitation is advanced is rich in water brown coal drying forming technique and equipment, is rich in the market competitiveness of water brown coal for raising, and it is significant to reduce cost.
Being rich in the water brown coal is the minimum coals of degree of coalification, is characterized in the moisture height, and porosity is big, the volatile matter height, and calorific value is low, contains the humic acids of different quantities.Oxygen level is up to 15wt% one 30wt%, chemical reactivity is strong, poor heat stability, broken serious during the lump coal heating, leave easy catamorphism in the air in, be fragmented into fritter even Powdered, calorific value is reduced more, and ash fusion point is also generally lower, often contains more calcium salt in the coal ash, wherein have from calcium humate, have from lime carbonate and Calucium Silicate powder.Moisture is to be rich in one of notable attribute of water brown coal, also is that it is used one of most important parameter of influence.
The drying and upgrading that is rich in the water brown coal is to change into the upgraded coal with similar bituminous coal character after standing at a certain temperature to dewater.Brown coal after the upgrading will more help comprehensive utilization, transportation and store.Remove if will be rich in the moisture of 40wt% in the water brown coal, then will reduce by 15% to the quantity discharged of the greenhouse gases of brown coal burning back generation.Actual test is learnt, the brown coal of a kind of moisture 42.52wt%, thermal value 11.93MJ/kg, after the drying upgrading, moisture drops to 14.43wt%, thermal value will increase to 18.08MJ/kg, be equivalent to improve calorific value 51.6%, this improves very huge beyond doubt for the economic worth that is rich in the water brown coal.
Traditional drying process is to utilize stack gas or steam-air associating heating agent directly to contact with brown coal and make it to be heated, moisture evaporation, and efficient is low; Drying is improper also can to make local superheating, the ature of coal variation, and control does not with great difficulty set off an explosion.
Summary of the invention
The purpose of this invention is to provide a kind of water brown coal drying moulding process for upgrading and key equipment thereof of being rich in.After being rich in the fragmentation of water brown coal process, drying, moulding upgrading processing, reduce cost the needs that transport in the strange land to satisfy; Boiler combustion generating or produce the needs of synthetic raw gas further improves the economic worth that is rich in the water brown coal and the comprehensive utilization of environment protection.It is few that this method has the production equipment floor space, reduced investment and can adapt to the drying and moulding that various differences are rich in the water brown coal.
A kind of water brown coal drying and upgrading production method that is rich in comprises: compositions such as brown coal storage, raw material conveying, the fragmentation of coal grain, slewing drum shaped pipe drier contact drying dewater, the smart broken heating of coal grain, hot high pressure are molded, moulded coal screening and returning charge.
The objective of the invention is to be achieved through the following technical solutions:
A kind of by being rich in water brown coal process for upgrading, its brown coal are through fragmentation, screening, drying, heating, moulding upgrading, it is characterized in that, this technology is with moisture 15wt% one 50wt%, coal particle size 300mm is with interior brown coal, pass through primary fragmentation in succession, with relative direction rotating operation, go out double roll crusher after brown coal are crushed to two roller gap lengths by double roll crusher; Secondary breaking is hit to counterpunch board and fragmentation through reversible hammer mill by the tup of high speed rotating with coal grain material; Secondary breaking coal grain is behind the slewing drum shaped multi-pipe drying mechanism contact drying, tertiary crushing, coal grain material is crushed to compression moulding requirement granularity through reversible hammer mill, hot-forming through high pressure roll press then, its moulded coal piece is of a size of 20 * 32 * 38mm, or suppresses according to the briquette prod demand; The mixed gas of slewing drum shaped multi-pipe drying mechanism discharge vaporization mainly contains water vapour, air, dust and other minor component, after electric dust collector is handled, meets environment protection emission.
Wherein, granularity 300mm through primary fragmentation, with relative direction rotating operation, goes out double roll crusher with the brown coal particle size reduction by double roll crusher with interior brown coal behind 20-50mm; Secondary breaking is hit to counterpunch board through reversible hammer mill by the tup of high speed rotating with 20-50mm coal grain material, and the coal grain is crushed to≤6.3mm; Tertiary crushing, broken before the coal grain be introduced into the slewing drum shaped multi-pipe drying mechanism drying, and then general≤6.3mm coal grain material is crushed to≤2mm through reversible hammer mill, reach hot high pressure molded require granularity.
In the technical scheme of the present invention, the coal grain adopts the slewing drum shaped multi-pipe drying mechanism contact drying after the secondary breaking, and the drum shaped body of its drying installation is made up of urceolus and internals, and internals are multitube tube bank member, the single tube diameter of tube bank is ￠ 50-150mm, the urceolus diameter is ￠ 1000-8000mm, and drum shaped body tilts, and its axially incline degree is at 7-20 °, by regulating inclination range, slewing drum shaped device axial slope is changed, guarantee flowing of coal grain, do not stop up; Drum shaped body is constantly rotation in the course of the work, and its speed of rotation is 4-15 rev/min, and by regulating rotating speed, the control coal residence time of grain in drying machine is to reach the moisture content of the dry outlet of control coal grain.
In the technical scheme of the present invention, coal grain drying operation is after the secondary breaking, by the broken next granularity≤6.3mm of brown coal, water content is a 15wt%-50wt% coal grain, continuously sends into ingress, top the slewing drum shaped multi-pipe drying mechanism from opening for feed, and dried coal grain comes out from exit, slewing drum shaped multi-pipe drying mechanism below, water content 8wt%-15wt%, walk in the pipe≤6.3mm coal grain, walk heating medium low-pressure steam, indirect heat exchange drying outside the pipe.Used heating medium low-pressure steam, pressure≤4 crust, temperature≤180 ℃, low-pressure steam is walked the outer and interior shell side of urceolus of tube bank, axially enter along drum shaped body, the medium that is dried in the heat transferred pipe, for Moulding Process of Brown Coal technology, coal grain outlet water content is 8wt%-15wt%, and drop temperature is 60-90 ℃.
In the technical scheme of the present invention, the inlet inventory of separate unit slewing drum shaped multi-pipe drying mechanism be the 47-60 ton/hour, the outlet material amount be the 34-44 ton/hour, in the separate unit slewing drum shaped multi-pipe drying mechanism evaporated water be the 13-16 ton/hour; It is 18.38 tons/hour that the separate unit slewing drum shaped multi-pipe drying mechanism consumes quantity of steam, and the steam index is 3.85 kilograms/square metre. hour, the water outlet ratio is 0.38 kg/kg, heat interchanging area is 1000-6000 square metre.
In the technical scheme of the present invention, high pressure roll press is hot-forming to be to utilize the roller of two relative rotary motion that material is compressed into the mould that provides, and the coal grain is pressed into desired shape there, and the shape and size of mould can change.Its high pressure roll press is hot-forming, adopts brown coal to need not to add caking agent hot pressing high-pressure molding technology, with water in the contained 8wt%-15wt% of brown coal after the slewing drum shaped multi-pipe drying mechanism drying as caking agent.The coal grain enter high pressure roll press hot-forming before, earlier through the shaper prepressing device, it is hot-forming that the coal grain is carried out carrying out after the precompression high pressure roll press again.The coal particle size that enters high pressure roll press is controlled in 1-2mm scope.
In the technical scheme of wood invention, high pressure roll press unit ability is: inlet inventory 0.2-55 ton/hour, the outlet material amount be the 0.16-44 ton/hour, briquette molding rate 〉=85%.
In the technical scheme of the present invention, the moulded coal after high pressure roll press is hot-forming is after screening, and satisfactory moulded coal is sent to moulded coal cooling belt and cools off firmly, improves the intensity and the thermostability of moulded coal; Undesirable moulded coal turns back to the reversible hammer mill ingress of tertiary crushing and mixes fragmentation with the moisture-free coal grain that slewing drum shaped multi-pipe drying mechanism comes through screening, recycle.
Major technique characteristics of the present invention are:
(1) have the water content height to being rich in the water brown coal, gaseous volatilization divides high, the characteristics of in the drying and upgrading process, easily catching fire and blasting, employing has the drying process of security measures, the drying temperature scope of control safety, adopting low-pressure superheated steam is the dry heat medium, make dry and hot-forming and course of conveying in have controllability and security measures, prevent brown coal since temperature too high, volatile matter gas evolution and dust and airborne oxygen reaction are blasted.
(2) adopt slewing drum shaped multi-pipe drying mechanism contact drying technology, this drying installation is a single-revolution drum shaped body device, and drum shaped body is made up of urceolus and internals, and internals are designed to the multitube tube bank.Drum shaped body tilts a little, becomes a gradient.Cold feed coal continuously from coal pellet bucket in sparger is sent into the slewing drum shaped multi-pipe drying mechanism pipe, the dry hot coal of crossing ceaselessly flows to the outlet of moisture eliminator bottom.Walk coal grain raw material in the slewing drum shaped multi-pipe drying mechanism tube bank, walk the heating steam medium outside the tube bank and in the urceolus, dry required heat energy is supplied with by low-pressure steam, and low-pressure steam axially enters along drum shaped body, and rapidly to the tube bank surface diffusion, and constantly the coal grain in the heat transferred tube bank pipe.
(3) slewing drum shaped multi-pipe drying mechanism is a rotational system, by regulating the slewing drum shaped multi-pipe drying mechanism speed of rotation, can improve heating medium and heated medium contact area, thereby improves heat transfer coefficient, shortens heat-up time, and vice versa.Also rotation in the lump of the multitube system of design in slewing drum shaped also makes simultaneously to be added medium and be easy to flow.Because drum shaped body tilts, cold coal raw material is continuously from also successfully flowing to the outlet of moisture eliminator in the top opening for feed is made a gift to someone moisture eliminator.
(4) absorption of air in coal enters drying installation enter atmosphere after the moisture with in water vapor is blended in fly-ash separator with after coal dust separates dedusting.Because the drying process of carrying out at low temperatures mainly is based on the moisture-free coal grain, the component of coal does not change substantially, and fugitive constituent gas is not overflowed, and the gas of discharging meets environmental protection requirement.
(5) adopt brown coal to need not to add the caking agent hot press forming technology, principle according to brown coal pore model, a large amount of aqueous pores are arranged in the brown coal, moisture in the pore is called interior water, after adopting tubular type contact drying technology, water is dried in most, also has small part moisture as caking agent.According to the type and the forming principle of brown coal, must keep certain interior water, pore is by conquassation during moulding, and pore is destroyed, and then the space of filling coal intergranular, presents interactional intermolecular forces, has strengthened the contact of coal intergranular and moulding.Brown coal pore after the moulding is destructurized, so the planar water phenomenon greatly reduces again.
(6) brown coal need not to add caking agent hot-forming be by brown coal drying, be heated to directly compression moulding under high pressure behind certain temperature, the insulation certain hour, it is low that this kind moulded coal has moisture, calorific value improves more than 50%, and the spontaneous combustion probability reduces, and is convenient to transport and reduce cost.It also is the raw material of brown coal hydrogasification.
Used slewing drum shaped multi-pipe drying machine and high pressure roller pressing machine are key equipment among the present invention.Because there is the moisture content height in brown coal, dry difficulty; Volatile matter height, very easily spontaneous combustion; Fixed carbon content is low, characteristics such as easy moisture absorption.Production method by technology of the present invention can solve the industrial production of brown coal drying and moulding preferably.
Advantage of the present invention:
Technology of the present invention and other drying process relatively have the advantage of following aspect:
A kind of contact drying method that is rich in the water brown coal through broken and slewing drum shaped multi-pipe drying mechanism, with the cryodrying medium as the heating agent source, drying machine by indirect heat exchange is with the raw coal (granularity＜6.3mm) be evenly distributed in the slewing drum shaped multi-pipe drying mechanism inlet pipe by coal grain sparger of certain particle size, be provided with rotation shape turning vane in the drying tube, coal is made corkscrew motion by gravity and screw-blade guide functions in drying tube, make the interior water and the surface-moisture of the absorption of coal grain be subjected to thermal evaporation, thereby reach the purpose of moisture-free coal grain.
Brown coal after drying carry out forming process according to the purposes difference of coal, adopt to need not to add the caking agent hot press forming technology, after adopting tubular type contact drying technology, leave the interior moisture of small part as caking agent, the moulding by adding hot coal grain and hot pressing roll-in.Pore is by conquassation during moulding, and pore is destroyed, and then the space of filling coal intergranular, has strengthened the contact of coal intergranular and moulding.Brown coal pore after the moulding is destructurized, so the phenomenon that absorbs water again greatly reduces.
Adopt contact drying technology to make whole drying process safety, reliable.Traditional drying process is to utilize stack gas or steam-air associating heating agent directly to contact with brown coal and make it to be heated, moisture evaporation, and efficient is poor; Drying is improper also can to make local superheating, the ature of coal variation, and control does not with great difficulty set off an explosion.This technology heat-transfer medium does not directly contact with brown coal, has solved the low ignition point coal and has adopted the inflammable defective of convection drying.
Because traditional drying process is to carry out under atmospheric low-temperature, the obsolete words of dried product in case make moist, can be recovered the original character of brown coal immediately.This is because the traditional drying temperature is lower, can not change the structure of coal, makes the characteristic of dry coal resemble sponge, in case be in again in malaria or the water, can absorb the moisture that loses rapidly again.And after adopting hot pressing extrusion forming technology, changed the structure of brown coal inside, and destroyed the pore physical structure, make it closely have the character of similar bituminous coal.
The drying plant mature and reliable, control is simple, by detecting the coal grain moisture of drying machine outlet, determines the feeding coal or the steam flow of drying machine import coal grain, and the import feeding coal is by the rotating speed of adjusting drying machine or vapor pressure and flow realization.
Adopt the present invention less, basic no waste discharge to the influence of environment.And when adopting traditional drying technology, will discharge a large amount of stack gas every day, CO in the flue gas
2Be not fully utilized, and atmosphere is produced " greenhouse " effect, drying is improper also can to produce H
2S, a spot of SO in the flue gas
2Also can produce detrimentally affect to environment.
The production equipment that employing the present invention builds, its processing unit are easy to manufacturing, construction is simple, production operation is easy, the device layout is compact, have favorable economic benefit.
Description of drawings
Fig. 1 is a kind of water Moulding Process of Brown Coal process for upgrading schema that is rich in of the present invention
Fig. 2 is a brown coal drying moulding process general flow chart of the present invention
Embodiment
In conjunction with the accompanying drawings content of the present invention is described further below by example.
What embodiment 1, employing the present invention designed is that raw material is produced 1000000 tons of brown coal dryings, the technical process of moulding device for improving quality and significant parameter per year with brown coal.
Technical process explanation (referring to Fig. 1)
1, brown coal fragmentation: the normal temperature that comes from the battery limit (BL) is rich in the at first incoming stock coal feeding warehouse of brown coal that the water yield is 35wt%, send into primary crusher (double roll crusher) through discharging conveyor, charging belt machine, the double roll crusher that has the high alloy material is crushed to two roller gap lengths with relative direction rotating operation with material.The coal grain of going into double roll crusher is≤300mm, and the coal grain after fragmentation goes out crusher to send into silo through the charging belt machine at 20-50mm, and the coal grain that comes out from silo enters the rough coal vibratory screening apparatus, and the rough coal grain after screening removes fine crusher (reversible hammer mill); After 20-50mm coal grain enters reversible hammer mill, hit to counterpunch board by the tup of high speed rotating, the coal grain is crushed to≤6.3mm, mixes with the duff grain of screening.
2, brown coal drying: by the broken next qualified coal grain≤6.3mm of brown coal, water content is 35wt%, after stock distributor carries out coal grain allocation process, send into dry feed machine ingress, slewing drum shaped multi-pipe drying mechanism top respectively, uniform distribution is continuously sent into the coal grain in the drying tube of slewing drum shaped multi-pipe drying mechanism.Because the slewing drum shaped multi-pipe drying mechanism drum shaped body tilts, walk in the pipe≤6.3mm feed coal grain, walk low pressure steam outside the pipe.Because heating medium does not directly contact with the coal grain, makes that whole drying process is safe and reliable, solved the safety problem that the low ignition point brown coal adopt the direct type drying to bring.
3, entering separate unit slewing drum shaped multi-pipe drying mechanism inventory is 47.275 tons/hour. platform, and amounting to feeding is 189.1 tons/hour; Evaporated water is 13.13 tons/hour in the separate unit slewing drum shaped multi-pipe drying mechanism. platform, and amounting to evaporated water is 52.52 tons/hour; Going out separate unit slewing drum shaped multi-pipe drying mechanism inventory is 34.15 tons/hour. platform, and amounting to load is 136.6 tons/hour; It is 18.38 tons/hour that the separate unit slewing drum shaped multi-pipe drying mechanism needs quantity of steam. platform; It is 73.53 tons/hour that total needs quantity of steam.The steam index of slewing drum shaped multi-pipe drying machine is 3.85 kilograms/square metre. hour, the water outlet ratio is 0.38 kg/kg, heat interchanging area is 4000 square metres.The dry hot coal of crossing ceaselessly flows to the outlet of moisture eliminator, and dry required heat energy is provided by the intrasystem low-pressure steam of multitube, low-pressure steam pressure≤4 crust, temperature 160--180 ℃.Low-pressure steam axially enters along drum shaped body, and rapidly to the tube outer surface diffusion, and constantly the coal grain in the heat transferred pipe, the discharging water content is 8wt%-15wt%, drop temperature is about 60-90 ℃, coal grain≤6.3mm.
4, the smart broken and insulation heating of coal grain: the moisture-free coal grain that is come by slewing drum shaped multi-pipe drying mechanism is≤6.3mm, water content is 8wt%-15wt%, temperature is 60-90 ℃ a moisture-free coal grain, coal bunker, moisture-free coal vibratory screening apparatus sieve after discharging chain type belt, rotary conveyor, drying respectively, the duff of≤2mm goes second reduction machine (reversible hammer mill) to carry out fragmentation, tup by high speed rotating hits to counterpunch board, the coal grain is crushed to≤2mm after insulation and heat 60-90 ℃ and use for the moulding thermocompressor.
5, hot high pressure is molded: qualified attritioning coal grain, granularity be at≤2mm, 60-90 ℃ of temperature, and moisture 8wt%-15wt%, the prepressing device before stock distributor, moisture-free coal hopper enter high pressure roll press compresses the aftershaping compression to the coal grain.High pressure roll-in process is to adopt to need not to add caking agent hot pressing high-pressure molding technology, the a small amount of interior water that pore leaves in the brown coal is as caking agent, pore is by conquassation in the process of high pressure compressed, and the contact of coal intergranular has been strengthened and closely moulding in the space of filling coal intergranular.High pressure roll press is to utilize the roller of two relative rotary motion material to be compressed in the mould that provides, and the coal grain can be pressed into the shape of requirement there, and the shape and size of module can change to a certain extent.
6, the coal particle size that enters the separate unit high pressure roll press is 1-2mm, water content 8wt%-15wt%, the inlet inventory be the 25-36 ton/hour. platform, amount to feeding and be the 125-180 ton/hour; Go out separate unit high pressure roll press inventory and be the 20-28 ton/hour. platform, amount to load and be the 100-140 ton/hour.Moulded coal is after rotary conveyor, moulded coal bolting; Satisfactory moulded coal is sent to moulded coal cooling belt, moulded coal warehouse, moulded coal transfer roller and is sent to the user.Undesirable moulded coal turns back to and goes smart fragmentation after the moisture-free coal grain of reversible hammer mill ingress with slewing drum shaped multi-pipe drying mechanism mixes.
Claims (17)
1, a kind of water brown coal process for upgrading that is rich in, its brown coal are through fragmentation, screening, drying, heating, moulding upgrading, it is characterized in that, this technology with moisture 15wt%-50wt%, coal particle size 300mm with interior brown coal, pass through primary fragmentation in succession, with relative direction rotating operation, go out double roll crusher after brown coal are crushed to two roller gap lengths by double roll crusher; Secondary breaking is hit to counterpunch board and fragmentation through reversible hammer mill by the tup of high speed rotating with coal grain material; Secondary breaking coal grain is behind the slewing drum shaped multi-pipe drying mechanism contact drying, tertiary crushing, coal grain material is crushed to compression moulding requirement granularity through reversible hammer mill, hot-forming through high pressure roll press then, its moulded coal piece is of a size of 20 * 32 * 38mm, or suppresses according to the briquette prod demand; The mixed gas of slewing drum shaped multi-pipe drying mechanism discharge vaporization mainly contains water vapour, air, dust and other minor component, after electric dust collector is handled, meets environment protection emission.
2, the water brown coal process for upgrading that is rich in as claimed in claim 1 is characterized in that: coal particle size 300mm through primary fragmentation, with relative direction rotating operation, goes out double roll crusher with the brown coal particle size reduction by double roll crusher with interior brown coal to 20-50mm.
3, the water brown coal process for upgrading that is rich in as claimed in claim 1 is characterized in that: described secondary breaking, 20-50mm coal grain material is hit to counterpunch board through reversible hammer mill by the tup of high speed rotating, and the coal grain is crushed to≤6.3mm.
4, the water brown coal process for upgrading that is rich in as claimed in claim 1, it is characterized in that: described tertiary crushing, the coal grain is introduced into the slewing drum shaped multi-pipe drying mechanism drying before broken, and then general≤6.3mm coal grain material is crushed to≤2mm through reversible hammer mill, reach hot high pressure molded require granularity.
5, the water brown coal process for upgrading that is rich in as claimed in claim 1, it is characterized in that: the coal grain adopts the slewing drum shaped multi-pipe drying mechanism contact drying after the secondary breaking, the drum shaped body of its drying installation is made up of urceolus and internals, internals are multitube tube bank member, the single tube diameter of tube bank is ￠ 50-150mm, and the urceolus diameter is ￠ 1000-8000mm.
6, the water brown coal process for upgrading that is rich in as claimed in claim 5, it is characterized in that: described slewing drum shaped multi-pipe drying mechanism drum shaped body tilts, its axially incline degree is at 7-20 °, by regulating inclination range, slewing drum shaped device axial slope is changed, guarantee flowing of coal grain, do not stop up.
7, the water brown coal process for upgrading that is rich in as claimed in claim 5, it is characterized in that: the slewing drum shaped multi-pipe drying mechanism drum shaped body is constantly rotation in the course of the work, its speed of rotation is 4-15 rev/min, by regulating rotating speed, the control coal residence time of grain in drying machine is to reach the moisture content of the dry outlet of control coal grain.
8, the water brown coal process for upgrading that is rich in as claimed in claim 1, it is characterized in that: coal grain drying operation is after the secondary breaking, by the broken next granularity≤6.3mm of brown coal, water content is a 15wt%-50wt% coal grain, continuously send into ingress, top the slewing drum shaped multi-pipe drying mechanism from opening for feed, dried coal grain comes out from exit, slewing drum shaped multi-pipe drying mechanism below, water content 8wt%-15wt%, walk in the pipe≤6.3mm coal grain, walk heating medium low-pressure steam, indirect heat exchange drying outside the pipe.
9, the water brown coal process for upgrading that is rich in as claimed in claim 8, it is characterized in that: described heating medium low-pressure steam, pressure≤4 crust, temperature≤180 ℃, low-pressure steam is walked the outer and interior shell side of urceolus of tube bank, along rousing axon to entering, the medium that is dried in the heat transferred pipe, for Moulding Process of Brown Coal technology, the medium coal grain that is dried outlet water content is 8wt%-15wt%, and drop temperature is 60-90 ℃.
10, the water brown coal process for upgrading that is rich in as claimed in claim 1, it is characterized in that: the slewing drum shaped drying machine of the separate unit of described slewing drum shaped multi-pipe drying mechanism inlet inventory be the 47-60 ton/hour, the outlet material amount be the 34-44 ton/hour, in the slewing drum shaped drying machine of separate unit evaporated water be the 13-16 ton/hour.
11, the water brown coal process for upgrading that is rich in as claimed in claim 1, it is characterized in that: it is 18.38 tons/hour that the slewing drum shaped drying machine of the separate unit of described slewing drum shaped multi-pipe drying mechanism consumes quantity of steam, the steam index is 3.85 kilograms/square metre. hour, the water outlet ratio is 0.38 kg/kg, and heat interchanging area is 1000-6000 square metre.
12, the water brown coal process for upgrading that is rich in as claimed in claim 1, it is characterized in that: described hot-forming through high pressure roll press, be to utilize the roller of two relative rotary motion material to be compressed into the mould that provides, the coal grain is pressed into desired shape there, and the shape and size of mould can change.
13, the water brown coal process for upgrading that is rich in as claimed in claim 12, it is characterized in that: described high pressure roll press is hot-forming, adopt brown coal to need not to add caking agent hot pressing high-pressure molding technology, with water in the contained 8wt%-15wt% of brown coal after the slewing drum shaped multi-pipe drying mechanism drying as caking agent.
14, as claimed in claim 12 by being rich in water brown coal process for upgrading, it is characterized in that: the coal grain enter high pressure roll press hot-forming before, earlier through the shaper prepressing device, it is hot-forming that the coal grain is carried out carrying out after the precompression high pressure roll press again.
15, as claimed in claim 12 by being rich in water brown coal process for upgrading, it is characterized in that: the coal particle size that enters high pressure roll press is controlled in 1-2mm scope.
16, the water brown coal process for upgrading that is rich in as claimed in claim 1, it is characterized in that: high pressure roll press unit ability is: inlet inventory 0.2-55 ton/hour, the outlet material amount be the 0.16-44 ton/hour, briquette molding rate 〉=85%.
17, as claimed in claim 1 by being rich in water brown coal process for upgrading, it is characterized in that: the moulded coal after high pressure roll press is hot-forming is after screening, and satisfactory moulded coal is sent to moulded coal cooling belt and cools off firmly, improves the intensity and the thermostability of moulded coal; Undesirable moulded coal turns back to the reversible hammer mill ingress of tertiary crushing and mixes fragmentation with the moisture-free coal grain that slewing drum shaped multi-pipe drying mechanism comes through screening, recycle.
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101792686A (en) * | 2010-02-11 | 2010-08-04 | 天地科技股份有限公司唐山分公司 | Lignite drying and screening forming process and drying and screening device thereof |
| CN101914403A (en) * | 2010-08-25 | 2010-12-15 | 山东天力干燥设备有限公司 | Process and system thereof for forming upgraded lignite |
| CN101776370B (en) * | 2010-01-07 | 2011-12-07 | 河北科技大学 | Method and device for drying and quality enhancement of lignite |
| CN102433187A (en) * | 2011-10-20 | 2012-05-02 | 中国重型机械研究院有限公司 | Method for quality improvement and formation for lignite |
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