CN103041745A - Powdered coal granulation method and equipment for lignite - Google Patents
Powdered coal granulation method and equipment for lignite Download PDFInfo
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- CN103041745A CN103041745A CN2013100110666A CN201310011066A CN103041745A CN 103041745 A CN103041745 A CN 103041745A CN 2013100110666 A CN2013100110666 A CN 2013100110666A CN 201310011066 A CN201310011066 A CN 201310011066A CN 103041745 A CN103041745 A CN 103041745A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
- C10L5/34—Other details of the shaped fuels, e.g. briquettes
- C10L5/36—Shape
- C10L5/363—Pellets or granulates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/20—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by expressing the material, e.g. through sieves and fragmenting the extruded length
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/14—Drying solid materials or objects by processes not involving the application of heat by applying pressure, e.g. wringing; by brushing; by wiping
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2250/00—Structural features of fuel components or fuel compositions, either in solid, liquid or gaseous state
- C10L2250/06—Particle, bubble or droplet size
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/08—Drying or removing water
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/24—Mixing, stirring of fuel components
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/30—Pressing, compressing or compacting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/08—Granular materials
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Abstract
The invention discloses a powdered coal granulation method and equipment for lignite. Raw material preparation during granulation is that powdered coal to be granulated is screened and crushed until the granularity is less than 4 mm; the water content of the powdered coal to be granulated is controlled between 20 and 45 percent; the screened and crushed powdered coal is conveyed to the granulation equipment for making powdered coal granules; the granularity of the powdered coal granules is 4-12mm, and the powdered coal granules are 5 to 30mm long; and the powdered coal granules are dried until the water content is 8 to 20 percent. The conventional powdered coal drying and pressing technology is changed into a powdered coal granulating and drying technology; and the granulating technology has the advantages of low energy consumption, low equipment loss, low equipment manufacturing cost, low production cost and high yield.
Description
Technical field
The present invention relates to the coal processing and utilization field, especially relate to fine coal granulation, the drying technology of brown coal.
Background technology
Brown coal or low rotten jet coal intensity is low, moisture content is high (moisture content is generally more than 30%), the unit caloric value is low, dust pollution is large, and its coal dust need to oven dry and die mould or granulation.Now the method that adopts of various countries is to be pressed into briquet after the oven dry or pair roller is squeezed into oval coal briquette.Because brown coal have cavernous structure, easily the moisture in the absorbing air and expanding so prior art is pressed into briquet or coal briquette needs very large pressure, reaches more than the 1000kg/c ㎡, and it is huge consume energy, and power consumption per ton surpasses 50 degree, the equipment manufacturing cost costliness, and loss is large.If raw coal elder generation die mould post-drying, fine coal can scatter in drying course with existing die mould mode, the dump slump does not reach the requirement of moulding, hinders processing and storing.
Summary of the invention
For problems of the prior art, goal of the invention provides a kind of fine coal prilling process and Granulation Equipments thereof of brown coal, existing " die mould technology after the coal dust oven dry " changed into " technology of coal dust granulation post-drying ", it is low that this granulating technique has power consumption, equipment loss is low, equipment manufacturing cost is low, and production cost is low, the advantage that output is large.
The present invention solves the technical scheme that its technical problem takes:
A kind of fine coal prilling process of brown coal, it is characterized in that: granulation step is as follows:
1. raw material preparation: the coal powder sieve that needs granulation, be crushed to particle diameter in 4 ㎜; Need the fine coal moisture control of granulation at moisture content 20%～45%;
2. granulating and forming: the fine coal after screening, the fragmentation is delivered to Granulation Equipments and is made pulverized coal particle, and the pulverized coal particle particle diameter is 4-12 ㎜, and length is 5-30 ㎜;
3. the oven dry: the pulverized coal particle behind the granulating and forming dry to moisture content be 8-20 %.
Further, step 1. in, need the fine coal moisture control of granulation at moisture content 30%～35%.
Further, the Granulation Equipments of step in 2. mainly connects a granulation pressure setting by a feeding serew conveyer and forms, and also includes a molding cutter device.Described feeding serew conveyer has the discharging opening that a charging aperture and is communicated with the granulation pressure setting; The granulation pressure setting includes a ring-type pressing mold, is provided with the adjustable pressure roller of a pair of spacing in the die cavity of ring-type pressing mold, and the ring-type pressing mold cooperates with nip and the equidirectional rotation; Also comprise and the feeding scraper plate of winding mold chamber center rotating; Spacer ring is provided with the pressing mold through hole on the described ring-type pressing mold perisporium; Described molding cutter device, it mainly is comprised of the batch (-type) feeding cutting knife that is arranged at ring-type pressing mold outside, and the contiguous pressing mold through hole of described cutting knife arranges.
Further, baking step is as follows:
1. in the brown coal raw material greater than the particle screening of 50 ㎜, be broken into the particle of particle diameter 4 ㎜～50 ㎜, become the particle of 4 ㎜～12 ㎜ particle diameters less than the grain granulation of 4 ㎜;
2. the brown coal particle after screening, fragmentation or the granulation is delivered in the pressure vessel airtight;
3. pass into the superheated steam of low-voltage high-temperature in the pressure vessel, the superheat steam temperature that passes into is greater than or equal to 300 ℃, and the superheated steam pressure that passes into is less than or equal to 2.0 MPas;
4. superheated steam passes in the pressure vessel and carries out heat exchange with the brown coal particle, and the pressure in the brown coal particle temperature reaches 130 ℃～290 ℃ or pressure vessel stops to feed superheated steam, the beginning voltage stabilizing during more than or equal to 1.5 MPa;
5. voltage stabilizing with the steam discharging in the container, was taken out the modified coal through the superheated steam heating by pressure vessel after 10 minutes, stacked cooling under the natural conditions.
Further, can repeat above-mentioned baking step 1.-5. for several times, so that the moisture content of modified coal reaches desired quantity.
Further, the superheat steam temperature that passes in 3. of baking step is greater than or equal to 400 ℃.
Further, described pressure vessel is still kettle, and this still kettle comprises a cylindrical shell, is respectively arranged with the interface of Bonding pressure table, thermometer on the described cylindrical shell; One steam inlet device that connects superheat steam pipeline is arranged on the bottom of cylindrical shell; Also be provided with the sewage draining exit of discharging condensed water in the bottom of cylindrical shell; The exhaust outlet of steam is arranged at cylindrical shell top or sidepiece in one discharging sulfur dioxide and the still.
Further, also be provided with inflation inlet and the gas vent of the superheated steam pressure in the stabilizing sleeve on the described still kettle cylindrical shell.
Further, be provided with track in the described still kettle cylindrical shell, a steaming maintaining vehicle pushes in the cylindrical shell along track.
Compared with prior art, the invention has the beneficial effects as follows:
The fine coal granulating technique of brown coal of the present invention is that existing " die mould technology after the coal dust oven dry " changed into " technology of coal dust granulation post-drying ".The fine coal particle diameter that needs granulation is controlled in 4 ㎜, and the granulating and forming rate is high, and shaping strength is good.The optimum range of the fine coal moisture control that needs granulation at moisture content 30%～35%, the granulation effect is best, and shaping strength is best, and ratio of briquetting is also the highest, and the Granulation Equipments that relates to operation is the most stable, and power consumption is low, per ton need 3～10 degree electricity, and equipment attrition is minimum.The granular-coal that makes according to granulating technique of the present invention, possessed easy oven dry, easily transportation, intensity is high, outward appearance is good, the advantage such as not yielding after drying course and the oven dry, with respect to fine coal and coarse coal, easilier used by the user, more convenient burning, and make burning more abundant.
The Granulation Equipments that the present invention relates to is by the relative rotation of the adjustable a pair of pressure roller of counterrotating ring-type pressing mold and spacing, the fine coal of granulation is involved between the two gradually, and clamp-on moulding in the ring mould through hole, cutting knife is cut into described length to the shaped granule of extruding from ring mould through hole.Granulation Equipments of the present invention can change by the aperture that changes ring mould through hole the particle diameter of pulverized coal particle, the length of regulating pulverized coal particle by the index(ing) feed distance of regulating cutting knife, and take the pulverized coal particle particle diameter that guarantees to make as 4-12 ㎜, length is 5-30 ㎜.Per hour but granulation is more than 28 tons for the comminutor that the present invention relates to, and ratio of briquetting can reach more than 90%.
Drying technology of the present invention is take superheated steam as heating agent, in still kettle the brown coal particle is heated to high temperature more than 300 ℃, makes the granule modified one-tenth of brown coal trend towards the characteristic of bituminous coal, simultaneously significantly dehydration desulfurization deoxygenation.Pressure vessel of the present invention guarantees that effectively the brown coal particle dries under the temperature and pressure of the best, and timely combustion gas and condensed water, and steam consumption is little, and equipment manufacturing cost is low.Brown coal particle moisture content after the oven dry is reduced significantly, and resorption is minimum, and spontaneous combustion, weathering do not occur, and the unit caloric value increases substantially.
The granular-coal that this technology is made has possessed easy oven dry, easily transportation, intensity is high, outward appearance is good, the advantage such as not yielding after drying course and the oven dry, with respect to fine coal and coarse coal, easilier used by the user, and more convenient burning, and make burning more abundant.
Description of drawings
Fig. 1 is the structural representation of Granulation Equipments of the present invention;
Fig. 2 is the structural representation of feeding serew conveyer of the present invention;
Fig. 3 is the structural representation of granulation pressure setting of the present invention;
Fig. 4 is the main TV structure schematic diagram of still kettle of the present invention;
Fig. 5 is the side-looking structural representation of still kettle of the present invention;
Fig. 6 is the oven dry schematic flow sheet of brown coal of the present invention.
The specific embodiment
A kind of fine coal prilling process of brown coal, granulation step is as follows:
Step 1, raw material preparation:
The coal powder sieve that needs granulation, be crushed to particle diameter in 4 ㎜, fineness is thinner, the granulating and forming rate is higher, shaping strength is also better, but thin powder has not just had difference with the powder of 0.1 ㎜ at ratio of briquetting and shaping strength than 0.1 ㎜.So the fine coal particle diameter after screening, the fragmentation is controlled at 4 ㎜ and gets final product with interior.The described fine coal moisture content of granulation that needs should be controlled at moisture content 20%～45%, and the granulation effect of moisture content 30%～35% is best, and intensity is best, ratio of briquetting is the highest, and the Granulation Equipments operation that relates to is the most stable, and power consumption is low, per ton need 3～10 degree electricity, the Granulation Equipments wearing and tearing are minimum.When the fine coal moisture content that needs granulation was lower than 20%, granulation intensity was good, but ratio of briquetting is low, and power consumption is large, and the Granulation Equipments wearing and tearing that relate to are large.When the fine coal moisture content that needs granulation greater than 40% the time, power consumption and the equipment loss of granulation are low, but the intensity variation, the granule strength after the oven dry is just poorer.Therefore, can use coal dry powder and raw coal wet-milling mix and blend after drying, control needs the moisture content of the fine coal of granulation to be the best 30%～35%.This step can be added also can not add binding agent, waterproofing agent, as long as control the moisture content of the fine coal that needs granulation well.
Fine coal after screening, the fragmentation is delivered to Granulation Equipments and is made pulverized coal particle, and the pulverized coal particle particle diameter is 4-12 ㎜, and length is 5-30 ㎜.As shown in Figure 1, described Granulation Equipments mainly connects a granulation pressure setting 2 by a feeding serew conveyer 1 and forms, and also includes a molding cutter device.Feeding serew conveyer 1 and granulation pressure setting 2 are driven by frequency control motor 4 and main transmission box 3 respectively.Feeding serew conveyer 1 connects a granulation pressure setting 2 and is driven by frequency control motor 4 and main transmission box 3 respectively.
Feeding serew conveyer 1 as shown in Figure 2, it mainly is comprised of screw-conveyer-shaft 11, stainless steel cylinder 12, and described stainless steel cylinder 12 is provided with the discharging opening 122 that a charging aperture 121 and is communicated with the granulation pressure setting.Screw-conveyer-shaft 11 plays the mass transport effect, and rotating speed is adjustable, and it drives screw-conveyer-shaft 11 by frequency control motor 4 by planet-cycloid reducer and rotates, and rotating speed can divide in the scope from 0-150 Zhuan ∕ to be regulated, and effectively rotating speed is that 12-120 Zhuan ∕ divide.
Granulation pressure setting as shown in Figure 3, it includes a ring-type pressing mold 21, is provided with the adjustable pressure roller of a pair of spacing 22 in the die cavity of ring-type pressing mold 21, ring-type pressing mold 21 and pressure roller 22 matched in clearance and equidirectional rotation; Spacer ring is provided with pressing mold through hole 211 on described ring-type pressing mold 21 perisporiums.Fine coal after screening, the fragmentation evenly is delivered in the die cavity of ring-type pressing mold 21 through feeding serew conveyer 1 discharging opening 122, the feeding scraper plate 23 of one winding mold chamber center rotating scrapes fine coal into the gap of pressure roller 22 with ring-type pressing mold 21, pressure roller 22 and ring-type pressing mold 21 opposite direction rotatings, fine coal is clamp-oned moulding in the ring mould through hole 211 of ring-type pressing mold 21, made the particle that particle diameter is 4-12 ㎜.
As shown in Figure 3, the molding cutter device of Granulation Equipments of the present invention, it mainly is comprised of the batch (-type) feeding cutting knife 5 that is arranged at ring-type pressing mold 21 outsides, and described cutting knife 5 contiguous pressing mold through holes arrange, so that the shaped granule of constantly extruding from ring mould through hole 211 is cut into required 5-30 ㎜ length.
Granulation Equipments of the present invention can change by the aperture that changes ring mould through hole 211 particle diameter of pulverized coal particle, the length of regulating pulverized coal particle by the index(ing) feed distance of regulating cutting knife 5, and take the pulverized coal particle particle diameter that guarantees to make as 4-12 ㎜, length is 5-30 ㎜.
Pulverized coal particle behind the granulating and forming is sent to and is used the superheated steam heating, drying in the airtight pressure vessel, dry to moisture content be 8-20 %, the pulverized coal particle of moisture content 15% is that the brown coal upgrading is the best moisture content point of thermal coal, granulation intensity is also best.
As shown in Figure 6, above-mentioned baking step is as follows:
1. in the brown coal raw material greater than the particle screening of 50 ㎜, be broken into the particle of particle diameter 4 ㎜～50 ㎜, become the particle of 4 ㎜～12 ㎜ particle diameters less than the grain granulation of 4 ㎜.
2. to deliver to pressure vessel airtight for the brown coal particle after the granulation.It is the still kettle 6 of 10 m3～400 m3 that the present invention selects effective stocking volume, or even the still kettle of larger effective stocking volume.Brown coal particle after screening of the present invention, the fragmentation is delivered in the still kettle 6 with steaming the charging of charging basket or steaming maintaining vehicle, simultaneously airtight spherical crown end socket 611.Be contained in the brown coal particle that steams on charging basket or the steaming maintaining vehicle and should keep maintaining gas permeability.
Still kettle 6 as shown in Figure 4, this still kettle 6 comprise a cylindrical shell 61 by saddle support 614 supports, and cylindrical shell 61 1 ends are provided with spherical crown end socket 611, and the other end is provided with ellipsoidal head 612, and spherical crown end socket 611 is provided with a safety interlock 613 lockings with cylindrical shell 61.
Be respectively arranged with the interface 62,63 of Bonding pressure table, thermometer on the described cylindrical shell 61, by the ruuning situation in Pressure gauge, the thermometer monitoring still kettle.
The bottom of cylindrical shell 61 is provided with air inlet 65, and air inlet 65 connects the steam inlet device 64 in superheat steam pipeline and the cylindrical shell 61.Bottom in cylindrical shell also is provided with sewage draining exit 66, and sewage draining exit 66 is installed drain valve, and condensed water in the still and dirt are discharged outside the still by drain valve.The exhaust outlet 67 of steam is arranged at cylindrical shell 61 tops in one discharging sulfur dioxide and the still.Also be provided with inflation inlet 68 and the gas vent 69 of the superheated steam pressure in the stabilizing sleeve on the described cylindrical shell 61.
As shown in Figure 5, be provided with track 614 in the cylindrical shell 61, steaming maintaining vehicle pushes in the cylindrical shell 61 along track, closes spherical crown end socket 611, utilizes safety interlock 613 that spherical crown end socket 611 is locked, plugs safety plug.The steam pressure for the treatment of steam boiler reaches more than 0.7 MPa, to spherical crown end socket 611 inflation, utilizes sealing gasket with 611 sealings of spherical crown end socket by inflation inlet, spherical crown end socket 611 sealing gasket heatproof 〉=450 °.
3. after 611 sealings of spherical crown end socket, open the valve of air inlet 65, pass into the superheated steam of low-voltage high-temperature in the still kettle, the superheat steam temperature that passes into is greater than or equal to 300 ℃, and preferably superheat steam temperature is greater than or equal to 400 ℃, and temperature is higher, heat that steam is with is high, to consume quantity of steam just less, the production cycle is shorter, utilization rate of equipment and installations is higher; Vapor (steam) temperature can not be lower than 300 ℃, vapor (steam) temperature is low be difficult to coal is heated to temperature required.The superheated steam pressure that passes into is less than or equal to 2.0 MPas, and steam pressure needn't be too high, and the pressure height certainly will cause the boiler cost high, and dangerous high, maintenance requirement is high.
4. superheated steam passes in the pressure vessel and carries out heat exchange with the brown coal particle, condensed water is discharged outside the still from the drain valve of cylindrical shell 61 bottom blow-down mouths 66, temperature and coal temperature constantly raise in the cylindrical shell, and the pressure in the cylindrical shell also constantly raises, by the ruuning situation in Pressure gauge, the thermometer monitoring still kettle.Pressure in the brown coal particle temperature reaches 130 ℃～290 ℃ or pressure vessel is closed the valve of air inlet 65 during more than or equal to 1.5 MPa, stops to feed superheated steam, the beginning voltage stabilizing.(burning-point of brown coal is by its development degree when the brown coal particle temperature surpasses 20 ℃ of the burning-points of coal, do not wait from 110 ℃～270 ℃ respectively from young brown coal to old brown coal) time, the superheat steam temperature that feeds is higher, what voltage stabilizing point container was interior requires pressure lower, it is too many that the coal temperature can not surpass burning-point, too high easily a large amount of forfeitures of fugitive constituent.Because the pressure in the brown coal intensity difference, cylindrical shell is too large, making easily particle be broken into powder affects vapour.
5. voltage stabilizing is after 10 minutes, and the time, more long-acting fruit was better.Brown coal are inner during this, and a series of modified-reactions can occur: sulphur and oxygen decrease produce sulfur dioxide and are discharged by the exhaust outlet 67 that is positioned at cylindrical shell 61 tops; The intrapore coal tar of coal particle and a large amount of pore water are passed volume-diminished etc. to particle surface.Open the valve of exhaust outlet 67, with the steam discharging in the cylindrical shell, close the valve of inflation inlet 68, open the valve of gas vent 69, the pressure of spherical crown end socket 611 sealing gaskets is released.After spherical crown end socket 611 sealing gasket pressure release, pull up safety pin, rotate safety interlock 613, open spherical crown end socket 611, take out the modified coal through the superheated steam heating, stack cooling under the natural conditions.(part is partly evaporated by superheated steam in container owing to modified coal internal void water major part becomes surface water, the total moisture of coal will reduce 30%～40%), the moisture content of coal can constantly evaporate in the process that dump cools off naturally, surface water reaches balance with the moisture content of surrounding air gradually, fine day generally after 48 hours total moisture content can drop to 10%～20%, overcast and rainy meeting remains between 18%～25%.
If total moisture content of coal is dropped to lower, can repeat above-mentioned steps 1.-5. for several times, minimum moisture content can be down in 1%.But the volume-diminished of coal particle has certain limit, generally can only dwindle 15%～20%.Moisture content falls too lowly, and the intensity of particle is with regard to variation, and the fugitive constituent of brown coal is high, and is when moisture content is lower than 12% unfavorable to the use of power plant as thermal coal.
Above embodiment only for explanation technological thought of the present invention, can not limit protection scope of the present invention with this, every technological thought that proposes according to the present invention, and any change of doing on the technical scheme basis all falls within the protection domain of the present invention.
Claims (15)
1. the fine coal prilling process of brown coal, it is characterized in that: granulation step is as follows:
1. raw material preparation: the coal powder sieve that needs granulation, be crushed to particle diameter in 4 ㎜; Need the fine coal moisture control of granulation at moisture content 20%～45%;
2. granulating and forming: the fine coal after screening, the fragmentation is delivered to Granulation Equipments and is made pulverized coal particle, and the pulverized coal particle particle diameter is 4-12 ㎜, and length is 5-30 ㎜;
3. the oven dry: the pulverized coal particle behind the granulating and forming dry to moisture content be 8-20 %.
2. the fine coal prilling process of a kind of brown coal as claimed in claim 1 is characterized in that: step 1. in, need the fine coal moisture control of granulation at moisture content 30%～35%.
3. the fine coal prilling process of a kind of brown coal as claimed in claim 1 or 2 is characterized in that: the Granulation Equipments of step in 2. mainly connects a granulation pressure setting by a feeding serew conveyer and forms, and also includes a molding cutter device; Described:
The feeding serew conveyer has the discharging opening that a charging aperture and is communicated with the granulation pressure setting;
The granulation pressure setting, it includes a ring-type pressing mold, is provided with the adjustable pressure roller of a pair of spacing in the die cavity of ring-type pressing mold, and the ring-type pressing mold cooperates with nip and the equidirectional rotation; Also comprise and the feeding scraper plate of winding mold chamber center rotating; Spacer ring is provided with the pressing mold through hole on the described ring-type pressing mold perisporium;
The molding cutter device, it mainly is comprised of the batch (-type) feeding cutting knife that is arranged at ring-type pressing mold outside, and the contiguous pressing mold through hole of described cutting knife arranges.
4. the fine coal prilling process of a kind of brown coal as claimed in claim 1 or 2, it is characterized in that: baking step is as follows:
1. in the brown coal raw material greater than the particle screening of 50 ㎜, be broken into the particle of particle diameter 4 ㎜～50 ㎜, become the particle of 4 ㎜～12 ㎜ particle diameters less than the grain granulation of 4 ㎜;
2. the brown coal particle after screening, fragmentation or the granulation is delivered in the pressure vessel airtight;
3. pass into the superheated steam of low-voltage high-temperature in the pressure vessel, the superheat steam temperature that passes into is greater than or equal to 300 ℃, and the superheated steam pressure that passes into is less than or equal to 2.0 MPas;
4. superheated steam passes in the pressure vessel and carries out heat exchange with the brown coal particle, and the pressure in the brown coal particle temperature reaches 130 ℃～290 ℃ or pressure vessel stops to feed superheated steam, the beginning voltage stabilizing during more than or equal to 1.5 MPa;
5. voltage stabilizing with the steam discharging in the container, was taken out the modified coal through the superheated steam heating by pressure vessel after 10 minutes, stacked cooling under the natural conditions.
5. the fine coal prilling process of a kind of brown coal as claimed in claim 4 is characterized in that: can repeat above-mentioned steps 1.-5. for several times, so that the moisture content of modified coal reaches desired quantity.
6. the fine coal prilling process of a kind of brown coal as claimed in claim 4 is characterized in that: the superheat steam temperature that step passes in 3. is greater than or equal to 400 ℃.
7. the fine coal prilling process of a kind of brown coal as claimed in claim 5 is characterized in that: the superheat steam temperature that step passes in 3. is greater than or equal to 400 ℃.
8. the fine coal prilling process of a kind of brown coal as claimed in claim 4, it is characterized in that: described pressure vessel is still kettle, and this still kettle comprises a cylindrical shell, is respectively arranged with the interface of Bonding pressure table, thermometer on the described cylindrical shell; One steam inlet device that connects superheat steam pipeline is arranged on the bottom of cylindrical shell; Also be provided with the sewage draining exit of discharging condensed water in the bottom of cylindrical shell; The exhaust outlet of steam is arranged at cylindrical shell top or sidepiece in one discharging sulfur dioxide and the still.
9. the fine coal prilling process of a kind of brown coal as claimed in claim 5, it is characterized in that: described pressure vessel is still kettle, and this still kettle comprises a cylindrical shell, is respectively arranged with the interface of Bonding pressure table, thermometer on the described cylindrical shell; One steam inlet device that connects superheat steam pipeline is arranged on the bottom of cylindrical shell; Also be provided with the sewage draining exit of discharging condensed water in the bottom of cylindrical shell; The exhaust outlet of steam is arranged at cylindrical shell top or sidepiece in one discharging sulfur dioxide and the still.
10. the fine coal prilling process of a kind of brown coal as claimed in claim 8 is characterized in that: the inflation inlet and the gas vent that also are provided with the superheated steam pressure in the stabilizing sleeve on the described still kettle cylindrical shell.
11. the fine coal prilling process of a kind of brown coal as claimed in claim 9 is characterized in that: the inflation inlet and the gas vent that also are provided with the superheated steam pressure in the stabilizing sleeve on the described still kettle cylindrical shell.
12. the fine coal prilling process of a kind of brown coal as claimed in claim 8 is characterized in that: be provided with track in the described still kettle cylindrical shell, a steaming maintaining vehicle pushes in the cylindrical shell along track.
13. the fine coal prilling process of a kind of brown coal as claimed in claim 9 is characterized in that: be provided with track in the described still kettle cylindrical shell, a steaming maintaining vehicle pushes in the cylindrical shell along track.
14. the fine coal prilling process of a kind of brown coal as claimed in claim 10 is characterized in that: be provided with track in the described still kettle cylindrical shell, a steaming maintaining vehicle pushes in the cylindrical shell along track.
15. the fine coal prilling process of a kind of brown coal as claimed in claim 11 is characterized in that: be provided with track in the described still kettle cylindrical shell, a steaming maintaining vehicle pushes in the cylindrical shell along track.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310011066.6A CN103041745B (en) | 2013-01-11 | 2013-01-11 | A kind of fine coal prilling process of brown coal and equipment thereof |
| PCT/CN2013/070563 WO2014107913A1 (en) | 2013-01-11 | 2013-01-16 | Pulverized coal granulation method and apparatus thereof for lignite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310011066.6A CN103041745B (en) | 2013-01-11 | 2013-01-11 | A kind of fine coal prilling process of brown coal and equipment thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN103041745A true CN103041745A (en) | 2013-04-17 |
| CN103041745B CN103041745B (en) | 2016-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310011066.6A Expired - Fee Related CN103041745B (en) | 2013-01-11 | 2013-01-11 | A kind of fine coal prilling process of brown coal and equipment thereof |
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| Country | Link |
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| WO (1) | WO2014107913A1 (en) |
Cited By (5)
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| CN103358582A (en) * | 2013-07-05 | 2013-10-23 | 郑州市鼎力干燥设备有限公司 | Brown coal extrusion dehydration forming machine |
| WO2014107915A1 (en) * | 2013-01-11 | 2014-07-17 | Cai Jingpeng | Pulverized coal granulator apparatus for lignite |
| CN107726736A (en) * | 2017-10-25 | 2018-02-23 | 西安华瑞联环保节能科技发展有限公司 | A kind of method and system for drying coal slime |
| CN110813448A (en) * | 2019-11-29 | 2020-02-21 | 宝清县福城众兴煤炭经销有限公司 | Lignite particle forming device and method |
| CN112556317A (en) * | 2020-12-08 | 2021-03-26 | 安徽森淼实业有限公司 | A drying equipment for hydroxypropyl methyl cellulose production |
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| CN108283912B (en) * | 2018-04-24 | 2023-11-03 | 遵义双河生物燃料科技有限公司 | Biological particle fuel pelletization device |
| CN113069996A (en) * | 2021-04-15 | 2021-07-06 | 安徽固瑞特新材料科技有限公司 | Spiral compounding formula carbon black granulator |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN103041745B (en) | 2016-03-23 |
| WO2014107913A1 (en) | 2014-07-17 |
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