CN112812870A - Coal slime solidification upgrading process and device thereof - Google Patents

Coal slime solidification upgrading process and device thereof Download PDF

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CN112812870A
CN112812870A CN202110012945.5A CN202110012945A CN112812870A CN 112812870 A CN112812870 A CN 112812870A CN 202110012945 A CN202110012945 A CN 202110012945A CN 112812870 A CN112812870 A CN 112812870A
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coal slime
solidification
coal
upgrading
heat conducting
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刘明锐
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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
    • C10L5/04—Raw material of mineral origin to be used; Pretreatment thereof
    • 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
    • C10L10/00—Use of additives to fuels or fires for particular purposes
    • C10L10/02—Use of additives to fuels or fires for particular purposes for reducing smoke development
    • 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
    • C10L5/06—Methods of shaping, e.g. pelletizing or briquetting
    • C10L5/10—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders
    • 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
    • C10L5/24—Combating dust during shaping or briquetting; Safety devices against explosion
    • 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
    • C10L9/00—Treating solid fuels to improve their combustion
    • C10L9/02—Treating solid fuels to improve their combustion by chemical means
    • 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
    • C10L9/00—Treating solid fuels to improve their combustion
    • C10L9/10—Treating solid fuels to improve their combustion by using additives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B1/00—Preliminary treatment of solid materials or objects to facilitate drying, e.g. mixing or backmixing the materials to be dried with predominantly dry solids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/001—Handling, e.g. loading or unloading arrangements
    • F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
    • F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
    • 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
    • C10L2290/08—Drying or removing water

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Abstract

The invention relates to the technical field of coal slime treatment, in particular to a coal slime solidification upgrading process and a device thereof, wherein the coal slime solidification upgrading process comprises the steps of conveying coal slime cakes to a single-shaft spiral stirrer through a scraper conveyor for stirring, and improving the composition of the coal slime by adding certain dehydration auxiliary agents and sulfur fixing agents; the coal slime is molded by the extruder and extruded into a cylindrical shape or a plum blossom shape; the formed coal slime is conveyed to the inclined radiation upgrading furnace and dehydrated at 90-150 ℃, the heat value can be improved by 1500-2000kcal/kg, the strength can be increased from 100N to over 1000N, and simultaneously, the SO in the coal slime is ensured due to the addition of the sulfur-fixing agent2The discharge is greatly reduced, and the italic radiation upgrading furnace in the coal slime solidification upgrading process comprises: the coal slime solidification upgrading process provided by the invention has the advantages of low cost, obvious improvement on the quality of coal slime, low dust content, high thermal efficiency and strong feasibility of implementation.

Description

Coal slime solidification upgrading process and device thereof
Technical Field
The invention relates to the technical field of coal slime treatment, in particular to a coal slime solidification and quality improvement process and a device thereof.
Background
The coal slime is a byproduct produced in a coal preparation plant, the granularity is less than 0.5mm, the water content is more than 30 percent, the ash content is about 30 to 40 percent, and the coal slime is in a thick mud cake shape. Due to high moisture, high ash content, high sulfur and lower heat value, (heat value 2000 plus 4000 kilocalories) the coal slime furnace has low economic value, strong liquidity, difficult loading, unloading and transportation, large storage occupation area, serious dust and water pollution, lack of furnace types capable of applying coal slime, difficult use for users and lower comprehensive value.
In 2019, the yield of raw coal in China is 38.5 million tons, the washing rate is 73%, and the yield of coal slime which is solid waste generated by annual washing is estimated to be about 2.8 million tons. The amount of waste that is currently stockpiled or landfilled as solid waste is about 10 million tons because it cannot be disposed of. The coal slime resource utilization is improved, the environmental pollution is reduced, the comprehensive utilization level of coal is improved, and the non-renewable resource waste is reduced, so that the method is a priority in the coal industry.
At present, the research on the treatment and utilization modes of coal slime mostly focuses on rotary furnace drying, rotary wing type coal slime drying and the like, hollow blade drying, steam rotary drying, microwave drying and the like. The rotary furnace has the advantages of relatively low energy consumption and large treatment capacity, but occupies a large area, particularly is matched with a dedusting, desulfurization and denitrification facility, and simultaneously needs high-temperature flue gas and has higher dust explosion risk. The rotary wing type coal slime drying efficiency is low, the failure rate is high, and the spontaneous combustion and explosion risks are high. The hollow blade dryer and the steam rotary dryer have the advantages of small treatment capacity, large maintenance amount and high risk of dust accumulation and spontaneous combustion. The microwave drying penetrability is strong, and electromagnetic energy converts the heat energy into and makes the material wholly heat up, and the heating is rapid and even, instant heating, does not have thermal inertia, does not need high temperature heat transfer medium, and energy utilization is high, but does not have the industrial application at present, and the cost is high. From the application point of view, the coal slime is generally used as a coal blending raw material, however, the coal slime itself is a byproduct of washing and cleaning coal, and the waste of the washing and cleaning process itself is caused by blending the coal slime into the cleaning coal. Meanwhile, the pulverized coal has extremely fine granularity, and is mixed into clean coal (usually lump coal), so that the mixing is difficult to be uniform, dust is seriously raised in the transportation process, and more importantly, users cannot apply the pulverized coal and still need to sieve the pulverized coal to screen the pulverized coal, so that the waste of a large amount of resources and energy consumption is caused.
Compared with the drying principle for deep processing and quality improvement of the coal slime, the method still needs to overcome the engineering problems in practical application such as high energy consumption, spontaneous combustion of dust, explosion risk and the like. The coal slime is firstly cured by a chemical method, so that the drying engineering problem is thoroughly avoided, and the shape of the coal slime is improved, so that the problems of stockpiling, transportation, storage, loading and unloading are solved, more importantly, the cured coal slime expands the application path, and the application path comprises electric power, chemical engineering (fixed bed gasification and chemical fertilizer), metallurgy (coking plants, blast furnace ironmaking, ferroalloy and calcium carbide), building materials (cement and the like), civil use and the like.
CN 107726736A method and system for drying coal slime provides a method that after the coal slime is formed, the flue gas generated by a hot blast stove is used for gas contact heat exchange with the formed coal, and the waste gas containing water vapor is collected by a bag type dust collector. The contact heat exchange by hot air or flue gas mentioned in the patent causes a large amount of dust and water vapor to escape simultaneously, and the dust and the water vapor must be collected by a cloth bag, so that the investment is increased. The hot air or flue gas contact heat exchange mentioned in the patent greatly reduces the heat exchange efficiency because high-temperature gas moves along the space with low gas pressure in the dryer and cannot enter between the briquette particles.
CN 111500303A 'A clean coal system and method by self-drying coal slime or low-rank coal', discloses a clean coal system and method by self-drying coal slime or low-rank coal, wherein a block making device is arranged in the clean coal system, and a heating chamber, a dry distillation chamber, a cooling chamber and the like dry-distill the coal slime by means of heat generated by spontaneous combustion. The process is difficult to achieve stable control of internal combustion and recovery of tar and gas and disposal of dust have not been indicated.
CN109130294A clean moulded coal drying and forming device discloses a clean moulded coal drying and forming device, which comprises a charging barrel, a forming box, a heating furnace, a conveyor belt and the like. Utilize the decurrent extrusion performance of spiral inlet pipe, make the coal slime when shaping roll extrusion moulding, the coalball shaping is perfect, and it is effectual to dry, is provided with the preheating chamber before drying, can effectively evaporate moisture. However, the problem of removing the briquette from the mold is not fundamentally solved, and the superior drying effect is not fundamentally explained.
CN108624371A molded coal processed from coal slime, discloses a method for preparing the molded coal by taking dehydrated coal slime as a main raw material, adding 0.5-15% of waste alkali mud, 2-8% of sawdust, 0.5-5% of waste plastic film and 0-2% of ramie chopper by weight of the dehydrated coal slime, stirring, emphasizing on an adhesive, and having obvious difference from the treatment mode of the invention.
CN103555383A Process for directly forming and utilizing coal slime of coal washing plant discloses that the coal slime is directly conveyed to a proportioning machine, a certain amount of raw coal and adhesive are added according to weight percentage, and after stirring and mixing evenly, the mixture can be formed by a double-roll forming machine or a screw extruder. The coal slime filter-pressed by the invention does not need to be dried and can be directly conveyed to a forming field, so that the coal slime is prevented from occupying land and being polluted; the forming process is simple, the mechanical strength of the coal briquette product is good, the heating value of the coal slime coal briquette can be adjusted by adding raw coal, the drying-free adhesive is emphasized, and the method is obviously different from the treatment method of the invention.
Under the condition that the quality-improving process and equipment cannot effectively solve the engineering application, the coal slime or the molded coal are still difficult to be applied to actual production, particularly the quality-improving process and the equipment. Therefore, there is a need to provide a new coal slurry solidification upgrading process and a new coal slurry solidification upgrading device to solve the above technical problems.
Disclosure of Invention
The invention aims to provide a coal slime solidification and quality improvement process and a device thereof, which are used for solving the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a coal slime solidification upgrading process and a device thereof comprise the following steps:
the method comprises the following steps: conveying the coal slime cake to a single-shaft spiral through a scraper conveyor for stirring, simultaneously stirring and uniformly kneading the additive and the sulfur-fixing agent, and ensuring that the additive fully reacts with water in the coal slime;
step two: the coal slime mixed with the additive is molded in the extruder, and the coal slime is extruded and molded into a cylindrical shape or a plum blossom shape with the diameter of 25-40 mm;
step three: the formed coal slime is conveyed to the inclined radiation upgrading furnace and dehydrated at 90-150 ℃, the water content of the formed coal slime can be reduced to 5% from 35%, the heat value can be improved by 1500-2000kcal/kg, and the strength of the formed coal slime can be increased to more than 1000N from 100N.
Preferably, the italic radiation upgrading furnace comprises a distribution trolley, a distributor, a bin body, a heat-conducting plate, a feed opening, a triangular guide plate and a discharge belt, wherein the distribution trolley is positioned at the top end of the bin body, the bottom end of the distribution trolley is fixedly connected with the distributor, the bin body is divided into two cavities, each cavity is provided with a feed opening at the top end, the heat-conducting plate is arranged below the feed opening, the heat-conducting plate and the bin body are arranged in a staggered mode, the side edges of the heat-conducting plate are communicated with a heat-conducting medium inlet and a heat-conducting medium outlet, the bottom end of the bin body is provided with the feed opening and the triangular guide plate, and the bottom.
Preferably, the distributing device is positioned right above the feeding hole.
Preferably, the cartridge body is angled at 30-45 ° from vertical.
Preferably, the discharge belts are three in total.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with other coal slime drying technologies, the coal slime drying technology has the advantages that the coal slime is prepared into solid with a certain shape, so that the generation of dust is improved, and the risks of spontaneous combustion and explosion are reduced;
2. compared with other coal slime drying technologies, the method provided by the invention has the advantages that the coal slime is prepared into solid rather than powder in a certain shape, so that a brand new channel is opened for subsequent coal blending and use including users.
3. Compared with other coal slime drying technologies, the invention obviously improves the discharge of sulfur in the product due to the addition of a certain sulfur-fixing agent.
4. Compared with other coal slime forming technologies, the invention skillfully utilizes the flocculating agent in the coal slime as the adhesive, does not add any chemical reagent except the sulfur-fixing agent, obviously reduces the production cost, and obviously reduces toxic and harmful substances in the product.
5. Compared with a common vertical drying furnace, the radiation upgrading furnace is an inclined furnace, so that dust generated by friction of coal slime rods in the furnace is greatly reduced, and the risk of spontaneous combustion and ignition is further reduced.
6. Compared with the common vertical drying furnace, the radiation upgrading furnace utilizes the principle of heat radiation at two sides, avoids the inconsistent drying degree caused by uneven air flow distribution, and avoids the smoke from being processed by an environment-friendly facility.
7. Compared with the common vertical drying furnace, the radiation upgrading furnace has no heat loss brought by the heat-conducting medium, so that the energy utilization efficiency is high and the energy consumption is low.
8. Compared with the common vertical drying furnace, the radiation upgrading furnace can utilize heat conduction oil or steam, even smoke and other media to conduct heat, and the selection range of a user is wide.
9. Compared with a common vertical drying furnace, the radiation upgrading furnace has the advantages of reasonable structural design, uniform material distribution, same retention time in the furnace, smooth and freely adjustable discharging, low failure rate and stable production.
Drawings
FIG. 1 is a schematic overall flow diagram of the present invention;
FIG. 2 is a schematic front view of an italic radiation upgrading furnace according to the present invention;
FIG. 3 is a schematic side view of the italic radiation upgrading furnace of the present invention;
FIG. 4 is a schematic top view of the italic radiation upgrading furnace of the present invention;
FIG. 5 is a schematic perspective view of an italic radiation upgrading furnace according to the present invention;
FIG. 6 is a schematic cross-sectional view of an italic radiation upgrading furnace according to the present invention.
In the figure: 1-material distributing trolley, 2-material distributor, 3-material inlet, 4-heat conducting plate, 5-bin body, 6-heat conducting medium inlet, 7-heat conducting medium outlet, 8-feed opening, 9-triangular guide plate, 10-discharging belt and 11-chamber.
Detailed Description
Example 1:
referring to fig. 1-6, the present invention provides a technical solution:
a coal slime solidification upgrading process and a device thereof comprise the following steps:
the method comprises the following steps: conveying the coal slime cake to a single-shaft spiral through a scraper conveyor for stirring, simultaneously stirring and uniformly kneading the additive and the sulfur-fixing agent, and ensuring that the additive fully reacts with water in the coal slime;
step two: the coal slime mixed with the additive is molded in the extruder, and the coal slime is extruded and molded into a cylindrical shape or a plum blossom shape with the diameter of 25-40 mm;
step three: the formed coal slime is conveyed to the inclined radiation upgrading furnace and dehydrated at 90-150 ℃, the water content of the formed coal slime can be reduced to 5% from 35%, the heat value can be improved by 1500-2000kcal/kg, and the strength of the formed coal slime can be increased to more than 1000N from 100N.
The inclined radiation upgrading furnace comprises a distribution trolley 1, a distributor 2, a bin body 5, a heat conducting plate 4, a feed opening 8, a triangular guide plate 9 and a discharge belt 10, wherein the distribution trolley 1 is positioned at the top end of the bin body 5, the bottom end of the distribution trolley 1 is fixedly connected with the distributor 2, the bin body 5 and a vertical plane form an angle of 30-45 degrees, the friction force between a coal slime rod and a molded coal is greatly reduced in the downward moving process of solidified coal slime, the generation amount of dust is also remarkably reduced, the risk of spontaneous combustion is further reduced, the bin body 5 is divided into two chambers 11, the top end of each chamber 11 is provided with a feed inlet 3, and the bin body 5 of the inclined radiation upgrading furnace is divided into two chambers 11The initial intention of (2) is to freely adjust the yield and reduce the blockage of simultaneously feeding a large amount of materials into the feed opening 8 due to the over-width of the bin body. Because the heat-conducting medium of the italic radiation upgrading furnace is clean heat-conducting oil or steam, the heat-conducting medium is not required to be subjected to dust removal or desulfurization and denitration, and the solidified coal slime escapes as steam after upgrading without any particulate matters or SO2And NOxThe inclined radiation upgrading furnace of the invention utilizes a radiation heat transfer mode taking heat transfer oil or steam as a medium, the heat transfer plate 4 and the bin body 5 have unique structural design, so that heat transfer occurs simultaneously on two sides of a coal slime bar and a briquette, the heat transfer efficiency is greatly improved, the upgrading effect is obviously improved, the side edge of the heat transfer plate 4 is communicated with a heat transfer medium inlet 6 and a heat transfer medium outlet 7, the temperature of the furnace body is about 150 ℃ at the highest position of the middle part, the furnace temperature at the furnace top is diffused upwards by hot steam to preheat the coal slime bar and the briquette at about 90 ℃, and cracking of the coal slime bar and the briquette caused by over-high temperature rise speed is effectively avoided, the bottom end of the bin body 5 is provided with a feed opening 8 and a triangular guide plate 9, the bin body is naturally cooled at the bottom of the furnace to avoid adsorbing water vapor in the air again due to high temperature of high-temperature coal mud rods and molded coal, the angle of a narrow opening of the feed opening 8 at the bottom of the furnace body is designed in a targeted manner, the problem of inconsistent residence time in the furnace is effectively solved, the problems of material accumulation and bridging are avoided, and the possibility of ignition due to temperature accumulation is greatly reduced, so that the temperature of the furnace in the inclined radiation upgrading furnace can be increased to 150 ℃, the bottom end of the triangular guide plate 9 is provided with three discharge belts 10, the discharge belts 10 are designed in three sets, the purpose is to adjust at any time under the condition that the feeding of a certain bin body is not smooth or the residence time is inconsistent, and the inclined radiation upgrading furnace can discharge from a single bin body and discharge from 0 to 1/3 bins once, when the discharging is carried out, the material distributing trolley and the material distributor start to feed materials so as to ensure that the materials are fully distributed in the whole bin space, and after the materials are fully distributed in the whole bin space, the heat loss can be reducedThe coal slurry and the rod-shaped coal are far lower, and the falling distance of the coal slurry and the rod-shaped coal is short, so that the breakage rate is reduced.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. It should be noted that there are no specific structures but a few objective structures due to the limited character expressions, and that those skilled in the art may make various improvements, decorations or changes without departing from the principle of the invention or may combine the above technical features in a suitable manner; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.

Claims (5)

1. The coal slime solidification and quality improvement process is characterized by comprising the following steps of:
the method comprises the following steps: conveying the coal slime cake to a single-shaft spiral through a scraper conveyor for stirring, adding an additive and a sulfur-fixing agent at the same time, stirring and uniformly kneading the coal slime and the additive, and ensuring that the additive fully reacts with water in the coal slime;
step two: the coal slime mixed with the additive is molded in the extruder, and the coal slime is extruded and molded into a cylindrical shape or a plum blossom shape with the diameter of 25-40 mm;
step three: the formed coal slime is conveyed to the inclined radiation upgrading furnace and dehydrated at 90-150 ℃, the water content of the formed coal slime can be reduced to 5% from 35%, the heat value can be improved by 1500-2000kcal/kg, and the strength of the formed coal slime can be increased to more than 1000N from 100N.
2. The coal slime solidification and upgrading process device according to claim 1, characterized in that: the inclined radiation upgrading furnace comprises a material distribution trolley (1), a material distributor (2), a bin body (5), a heat conducting plate (4), a feed opening (8), a triangular guide plate (9) and a discharge belt (10), the distributing trolley (1) is positioned at the top end of the bin body (5), the bottom end of the distributing trolley (1) is fixedly connected with a distributing device (2), the bin body (5) is divided into two chambers (11) in total, the top end of each cavity (11) is provided with a feed inlet (3), the heat conducting plate (4) is arranged below the feed inlet (3), the heat conducting plates (4) and the bin bodies (5) are arranged in a staggered way, the side edges of the heat conducting plates (4) are communicated with a heat conducting medium inlet (6) and a heat conducting medium outlet (7), the bottom of the bin body (5) is provided with a feed opening (8) and a triangular guide plate (9), and the bottom of the triangular guide plate (9) is provided with a discharging belt (10).
3. The coal slime solidification and upgrading process device according to claim 2, characterized in that: the heat conducting plate (4) is internally provided with a heat conducting pipe, and a heat conducting medium penetrates through the heat conducting pipe.
4. The coal slime solidification and upgrading process device according to claim 2, characterized in that: the angle between the bin body (5) and the vertical plane is 30-45 degrees.
5. The coal slime solidification and upgrading process device according to claim 2, characterized in that: the angle of the triangular guide plate (9) is 45-60 degrees to ensure smooth discharging.
CN202110012945.5A 2021-01-06 2021-01-06 Coal slime solidification upgrading process and device thereof Pending CN112812870A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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CN103555383A (en) * 2013-11-13 2014-02-05 河南理工大学 Process of directly forming and utilizing coal slime of coal cleaning plant
CN205619746U (en) * 2016-03-18 2016-10-05 淄博金安型煤有限公司 Environment -friendly moulded coal drying device
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Publication number Priority date Publication date Assignee Title
GB2607152A (en) * 2021-05-29 2022-11-30 Univ China Mining Dehydration and upgrading system for high-water-content material
GB2607152B (en) * 2021-05-29 2024-01-24 Univ China Mining Dehydration and upgrading system for high-water-content material

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