CN114032126A - Raw material treatment method - Google Patents
Raw material treatment method Download PDFInfo
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- CN114032126A CN114032126A CN202111430229.5A CN202111430229A CN114032126A CN 114032126 A CN114032126 A CN 114032126A CN 202111430229 A CN202111430229 A CN 202111430229A CN 114032126 A CN114032126 A CN 114032126A
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000002994 raw material Substances 0.000 title claims abstract description 13
- 239000003245 coal Substances 0.000 claims abstract description 158
- 239000000654 additive Substances 0.000 claims abstract description 111
- 230000000996 additive effect Effects 0.000 claims abstract description 95
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 95
- 239000000843 powder Substances 0.000 claims abstract description 77
- 239000002245 particle Substances 0.000 claims abstract description 73
- 238000002156 mixing Methods 0.000 claims abstract description 60
- 239000002817 coal dust Substances 0.000 claims abstract description 37
- 239000012798 spherical particle Substances 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 23
- 239000011280 coal tar Substances 0.000 claims description 16
- 239000003921 oil Substances 0.000 claims description 10
- 150000001875 compounds Chemical class 0.000 claims description 9
- 238000007670 refining Methods 0.000 claims description 6
- 229920000642 polymer Polymers 0.000 claims description 5
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 4
- 239000000460 chlorine Substances 0.000 claims description 4
- 229910052801 chlorine Inorganic materials 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- 239000011593 sulfur Substances 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000009736 wetting Methods 0.000 claims description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims 1
- 238000002309 gasification Methods 0.000 abstract description 24
- 239000000428 dust Substances 0.000 abstract description 11
- 239000002002 slurry Substances 0.000 abstract description 11
- 238000000227 grinding Methods 0.000 abstract description 8
- 230000003749 cleanliness Effects 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 description 28
- 230000000694 effects Effects 0.000 description 8
- 239000000047 product Substances 0.000 description 8
- 238000001035 drying Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 5
- 238000003672 processing method Methods 0.000 description 5
- 230000001788 irregular Effects 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005984 hydrogenation reaction Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 239000010692 aromatic oil Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003250 coal slurry Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- -1 meanwhile Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
- 239000011882 ultra-fine particle Substances 0.000 description 1
Classifications
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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
- 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
- C10L5/34—Other details of the shaped fuels, e.g. briquettes
- C10L5/36—Shape
-
- 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
-
- 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
-
- 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
- C10L2290/32—Molding or moulds
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The disclosure relates to the technical field of coal gasification, in particular to a raw material treatment method. The raw material treatment method provided by the disclosure comprises the following steps: mixing coal powder, water and an additive to obtain a mixed material; and forming the mixed material to obtain spherical particles, wherein gaps are formed between the outermost additive and the coal dust. The separated pulverized coal which is ground into fine pulverized coal by a grinding machine is added with certain water and additives to prepare stable slurry, and the slurry is conveyed into forming equipment to be prepared into micron-sized spherical particles, wherein the particles are spherical, so that the combustible risk of the fine pulverized coal particles is reduced, the conveying is convenient, the problem of applicability of the fine pulverized coal is solved, the dust carrying amount of gasified synthetic gas is reduced, the load of post-treatment dust removal equipment is reduced, and the product cleanliness is improved.
Description
Technical Field
The disclosure relates to the technical field of coal gasification, in particular to a raw material treatment method.
Background
The coal hydrogenation gasification technology adopts coal powder and hydrogen to directly generate hydrogenation gasification reaction to generate methane, aromatic oil and semicoke. The particle size of the raw material coal powder is generally required to be more than 90% and less than 75 microns, and when the whole particle size is required to be controlled to be 5-100 microns, the method is most beneficial to hydro-gasification reaction. However, the maximum particle size of the coal is effectively controlled by controlling the air-coal ratio, the grinding time and the like through grinding the coal by a conventional grinder, but the minimum particle size cannot be effectively controlled, so that more ultrafine particles which are smaller than the minimum particle size, such as particles smaller than 5 microns or even smaller, are generally generated while the maximum particle size is met. The existence of these superfine particles can lead to the flammable risk degree when the buggy piles up to improve, the transport resistance that superfine particle buggy argillization leads to when the high moisture buggy is carried increases and the increase of pipeline blockage risk, the semicoke granule that superfine particle corresponds the production after the reaction is also finer, it is serious to lead to the semicoke to scatter, seriously influence the transportation and the shipment of semicoke and the recycling process of semicoke, also can cause the dust concentration among the semicoke service environment too high, influence the use and the recycle of semicoke.
Disclosure of Invention
To solve the above technical problem or at least partially solve the above technical problem, the present disclosure provides a raw material processing method.
The present disclosure provides a raw material processing method, comprising:
mixing coal powder, water and an additive to obtain a mixed material;
and forming the mixed material to obtain spherical particles, wherein gaps are formed between the outermost additive and the coal dust.
Further: the mass ratio of the water to the pulverized coal is (0.3-0.6): 1.
in the preferred technical scheme, the mass ratio of the water to the pulverized coal is 0.3: 1. 0.4: 1
0.5: 1 or 0.6: 1.
further: the mass ratio of the additive to the pulverized coal is (0.05-0.2): 1.
in the preferable technical scheme, the mass ratio of the additive to the coal powder is 0.05: 1. 0.1: 1. 0.15: 1 or 0.2: 1
Further, the method for mixing materials comprises the following steps: wetting the pulverized coal by water to form a water film outside the pulverized coal;
and adding the additive to wrap the additive on the outer layer of the water film.
Further, the method for mixing materials comprises the following steps: dividing the total added mass M1 of the water into N equal parts, and dividing the total added mass M2 of the additive into N equal parts;
firstly, adding water with the mass of M1/N into the coal powder, uniformly mixing, adding an additive with the mass of M2/N, and uniformly mixing;
secondly, adding water with the mass of M1/N into the coal powder, uniformly mixing, adding an additive with the mass of M2/N, and uniformly mixing;
adding sequentially until the Nth time, adding the last part of M1/N water, mixing uniformly, adding the last part of M2/N additive, and mixing uniformly.
Further, the method for mixing materials comprises the following steps: adding water accounting for 50% of the total mass of the required water into the pulverized coal, uniformly mixing, adding an additive accounting for 50% of the total mass of the required additive, and uniformly mixing;
and adding water accounting for 50% of the total mass of the required water, uniformly mixing, adding additives accounting for 50% of the total mass of the required additives, and uniformly mixing.
Furthermore, the additive is a high molecular compound which has adhesive property and can be decomposed at 400-1000 ℃.
Further, the polymer compound contains a carbon element and a hydrogen element, and the polymer compound does not contain a metal element, a sulfur element, or a chlorine element.
Further, the additive comprises coal tar or miscellaneous oil left after the coal tar is refined.
Further, the particle size of the spherical particles is 20-100 microns.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
the raw material processing method provided by the embodiment of the disclosure comprises the following steps: mixing coal powder, water and an additive to obtain a mixed material; and forming the mixed material to obtain spherical particles, wherein gaps are formed between the outermost additive and the coal dust. The separated pulverized coal which is ground into fine pulverized coal by a grinding machine is added with certain water and additives to prepare stable slurry, and the slurry is conveyed into forming equipment to be prepared into micron-sized spherical particles, wherein the particles are spherical, so that the combustible risk of the fine pulverized coal particles is reduced, the conveying is convenient, the problem of applicability of the fine pulverized coal is solved, the dust carrying amount of gasified synthetic gas is reduced, the load of post-treatment dust removal equipment is reduced, and the product cleanliness is improved.
After the water of the spherical particles is evaporated and dried, a certain gap exists between the irregular coal dust particles and the additive on the outermost layer, the coal dust particles are used as cores, the small amount of gaps are formed on the middle layer, the spherical particles with the additive are wrapped on the outermost layer, the wrapping effect of the additive can ensure that the coal dust particles can still maintain the state of the spherical particles after the water on the outer layer of the coal dust particles is dried and molded, the particles are spherical, the flowability of the molded coal dust is promoted, and the stability of coal dust conveying is facilitated. Gaps are formed between the coal dust particles and the additive on the outermost layer, so that gasification reaction is facilitated, the spherical particles can react fully and quickly, and incomplete reaction or unfavorable reaction caused by too large coal particles is avoided.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
The raw material processing method provided by the embodiment of the disclosure comprises the following steps: mixing coal powder, water and an additive to obtain a mixed material; and forming the mixed material to obtain spherical particles, wherein gaps are formed between the outermost additive and the coal dust. The separated pulverized coal which is ground into fine pulverized coal by a grinding machine is added with certain water and additives to prepare stable slurry, and the slurry is conveyed into forming equipment to be prepared into micron-sized spherical particles, wherein the particles are spherical, so that the combustible risk of the fine pulverized coal particles is reduced, the conveying is convenient, the problem of applicability of the fine pulverized coal is solved, the dust carrying amount of gasified synthetic gas is reduced, the load of post-treatment dust removal equipment is reduced, and the product cleanliness is improved. The additive participates in the reaction in the gasification reaction process, and the yield of the final product is improved to a certain extent.
After the water of the spherical particles is evaporated and dried, a certain gap exists between the irregular coal dust particles and the additive on the outermost layer, the coal dust particles are used as cores, the small amount of gaps are formed on the middle layer, the spherical particles with the additive are wrapped on the outermost layer, the wrapping effect of the additive can ensure that the coal dust particles can still maintain the state of the spherical particles after the water on the outer layer of the coal dust particles is dried and molded, the particles are spherical, the flowability of the molded coal dust is promoted, and the stability of coal dust conveying is facilitated. Gaps are formed between the coal dust particles and the additive on the outermost layer, so that gasification reaction is facilitated, the spherical particles can react fully and quickly, and incomplete reaction or unfavorable reaction caused by too large coal particles is avoided.
According to the raw material processing method provided by the embodiment of the disclosure, separated pulverized coal which is ground by a grinding machine is added with certain water and additives to prepare stable slurry, and the stable slurry is conveyed into a forming device to prepare micron-sized spherical particles, so that the combustible risk of the pulverized coal particles is reduced, the conveying is convenient, the applicability problem of the pulverized coal is solved, the dust carrying amount of gasified synthetic gas is reduced, the load of post-processing dust removal equipment is reduced, and the product cleanliness is improved.
The detailed process of the method is as follows: after the coal is ground by the grinding machine, about-5% of pulverized coal is separated, the particle size of the pulverized coal is less than 5 microns, namely the particle size of the pulverized coal is lower than the particle demand range (5-100 microns) of coal hydro-gasification pulverized coal, and the part of the over-fine pulverized coal less than 5 microns usually enters a filter along with the separation airflow of the grinding machine due to light weight. In the patent process, the part of the fine coal powder is discharged from the filter and enters the coal powder treatment tank, and the fine coal powder is treated separately and then added into the coal powder storage tank for being conveyed to the coal hydro-gasification reactor to participate in the reaction.
The process of discharging the fine coal powder from the filter and independently processing the fine coal powder comprises the following steps: the method is characterized in that water and additives are added into coal dust in a certain proportion, the coal dust is wetted by the water firstly, so that coal dust particles can be separated under the dispersion action of the water, the coal dust particles are wrapped in the water under the action of the surface tension of the water, a layer of water film is formed outside the coal dust particles, then, a certain amount of additives are added, the additives can be promoted to wrap the outer layer of the water film to form internal coal dust particles, the water film is arranged outside the coal dust particles, and the water film is in a layered wrapping structure of the additive film.
The method for mixing materials comprises the following steps: dividing the total added mass M1 of the water into N equal parts, and dividing the total added mass M2 of the additive into N equal parts; firstly, adding water with the mass of M1/N into the coal powder, uniformly mixing, adding an additive with the mass of M2/N, and uniformly mixing; secondly, adding water with the mass of M1/N into the coal powder, uniformly mixing, adding an additive with the mass of M2/N, and uniformly mixing; adding sequentially until the Nth time, adding the last part of M1/N water, mixing uniformly, adding the last part of M2/N additive, and mixing uniformly.
Where N is an integer, and may be any number such as 1, 2, 3, 4, 5 … …, and the like. The percentage of the amount added in each time to the total amount (total water amount or total additive amount) is preferably selected to be added in a plurality of times after the same proportion is reduced, so that the stable spherical coal dust particles are favorably formed, and the gasification reaction and the balance of the reaction temperature are favorably realized.
And when N is 1, adding water with the mass of M1 into the coal powder, uniformly mixing, adding an additive with the mass of M2, and uniformly mixing.
When N is 2, adding water with the mass of M1/2 into the coal powder, uniformly mixing, adding an additive with the mass of M2/2, and uniformly mixing; and adding water with the mass of M1/2 into the coal powder, uniformly mixing, adding an additive with the mass of M2/2, and uniformly mixing.
When N is 3, adding water with the mass of M1/3 into the coal powder for the first time, uniformly mixing, adding an additive with the mass of M2/3, and uniformly mixing; secondly, adding water with the mass of M1/3 into the coal powder, uniformly mixing, adding an additive with the mass of M2/3, and uniformly mixing; thirdly, adding water with the mass of M1/3 into the coal powder, uniformly mixing, adding an additive with the mass of M2/3, and uniformly mixing.
When N is 4, adding water with the mass of M1/4 into the coal powder for the first time, uniformly mixing, adding an additive with the mass of M2/4, and uniformly mixing; secondly, adding water with the mass of M1/4 into the coal powder, uniformly mixing, adding an additive with the mass of M2/4, and uniformly mixing; thirdly, adding water with the mass of M1/4 into the coal powder, uniformly mixing, adding an additive with the mass of M2/4, and uniformly mixing; fourthly, adding water with the mass of M1/4 into the coal powder, uniformly mixing, adding an additive with the mass of M2/4, and uniformly mixing.
The additive is uniformly wrapped on the coal powder by adding water and the additive for multiple times respectively, the coal powder is completely wrapped to form spherical particles, after the water of the spherical particles is evaporated and dried, a certain gap exists between irregular coal powder particles and the additive on the outermost layer, the coal powder particles are formed to be a core, the middle layer is a small amount of gaps, the spherical particles wrapped with the additive on the outermost layer, the wrapping effect of the additive can ensure that the coal powder particles can still maintain the state of the spherical particles after the outer layer of the coal powder particles is dried and formed, the particles are spherical to promote the flowability of the formed coal powder, and the stability of coal powder conveying is facilitated. Gaps are formed between the coal dust particles and the additive on the outermost layer, so that gasification reaction is facilitated, the spherical particles can react fully and quickly, and incomplete reaction or unfavorable reaction caused by too large coal particles is avoided. The water and the additive can be added for a plurality of times, when the coal powder is added for two times, namely 50% of the total water amount is added into the coal powder, 50% of the total additive amount is added after the coal powder is uniformly mixed, 50% of the total water amount is added after the coal powder is uniformly mixed, 50% of the total additive amount is added after the coal powder is uniformly mixed, and the like, the coal powder can be added for a plurality of times, however, the percentage of the added amount in the total amount (the total water amount or the total additive amount) is preferentially selected to be added for a plurality of times after the same proportion is reduced, so that stable spherical coal powder particles can be formed, and the gasification reaction and the balance of the reaction temperature are facilitated.
The mass ratio of the water to the pulverized coal is (0.3-0.6): 1. in the preferred technical scheme, the mass ratio of water to coal powder is 0.3: 1. 0.4: 1. 0.5: 1 or 0.6: 1. the mass ratio of water to coal powder is preferably: and (3) 1 is the ratio of (0.3-0.6) to the coal powder, so that the possibility of blocking a pipeline due to separation of the water and the coal powder in the conveying process caused by addition of more water is reduced. The mass ratio of the water to the pulverized coal is (0.3-0.6): 1, the pulverized coal can be fully wetted and wrapped by water to form thick water-coal slurry, a certain amount of water is controlled to reduce the energy consumption of subsequent spray drying, and water can be rapidly dried, granulated or molded.
The additive is a high molecular compound which usually has certain cohesiveness and can be thermally decomposed at the temperature of 400-1000 ℃, so that the additive can be adhered to the outside of a water film outside the coal dust particles to form a package for the coal dust particles and the water film, and can be decomposed into a small molecular compound by heating at a certain temperature, so that harmful elements cannot be generated on residual substances after reaction, and meanwhile, the decomposed product can also have a promoting effect on the yield of reaction products. The high molecular compound component preferably only contains carbon element and hydrogen element, and also can contain certain oxygen element, but cannot contain metal, sulfur element and chlorine element, so as to prevent the existence of metal from generating adverse effect on residues after the reaction of the pulverized coal, and prevent the existence of sulfur and chlorine from corroding and damaging equipment.
The additive is preferably coal tar or the residual miscellaneous oil after the coal tar is refined, and after the coal dust is dried and dehydrated, the skeleton supporting effect on the formed coal dust can be achieved through the adhesive force and the crosslinking effect of the additive wrapped between coal dust particles or outside the particles, so that the formed coal dust particles are prevented from being loosened again to form fine particles to influence the conveying and subsequent separation effects.
The additive is preferably coal tar or miscellaneous oil left after coal tar refining, the price is mainly considered to be low, chemical reaction can not occur in the subsequent forming and drying process, meanwhile, the coal tar or miscellaneous oil left after coal tar refining is mainly generated by coal pyrolysis or gasification, and the like, the addition of the coal tar or miscellaneous oil left after coal tar refining can not generate adverse effect on the subsequent reaction participated by coal dust, and meanwhile, for hydro-gasification reaction, the addition of the coal tar or miscellaneous oil left after coal tar refining can further decompose the formed coal tar wrapped with fine coal dust or miscellaneous oil left after coal tar refining in the coal hydro-gasification process, so that the yield of gas-phase or liquid-phase oil products of coal hydro-gasification is increased.
The mass ratio of the additive to the pulverized coal is (0.05-0.2): 1.
in the preferable technical scheme, the mass ratio of the additive to the coal powder is 0.05: 1. 0.1: 1. 0.15: 1 or 0.2: 1.
the mass ratio of the additive to the coal dust is preferably as follows: additive: coal powder (0.05-0.2): the additive is added in proportion, so that the viscosity of the coal water slurry can be improved, granulation and molding are facilitated, meanwhile, the influence of overlarge viscosity of the coal water slurry on the flowability caused by the excessive additive can be avoided, and the stability of the subsequent molded coal powder particle conveying process is further ensured.
After the fine coal powder, water and an additive are mixed and stirred uniformly according to a proportion, the mixture is sent into a forming device through a delivery pump, preferably a spray dryer, the drying temperature is lower than 80 ℃, the drying of the water content of the coal water slurry and the forming of the coal powder can be simultaneously completed through the device, the particle size of the formed coal powder can be controlled within the range of 20-100 microns by controlling the feeding speed, the temperature and other operation parameters of the spray dryer, so as to meet the requirements of coal hydro-gasification on the particle size of the coal powder, meanwhile, spherical particles can be formed, after the water on the outer layer of the coal powder in the spherical particles is evaporated and dried, a certain gap exists between the irregular coal powder particles and the additive on the outermost layer, the coal powder particles are used as cores, the middle layer is a small amount of gaps, the spherical particles with the additive wrapped on the outermost layer are formed, the wrapping effect of the additive can ensure that the water on the outer layer of the coal powder particles is dried and formed, the pulverized coal particles can still maintain the state of spherical particles, and the particles are spherical to promote the fluidity of the molded pulverized coal, thereby being beneficial to the stability of pulverized coal conveying.
The micron-sized spherical pulverized coal particles prepared by the forming equipment mainly comprise pulverized coal, additives which are arranged between or outside the pulverized coal particles and a small amount of moisture, the spherical pulverized coal particles enter a pulverized coal storage tank, are mixed with qualified pulverized coal which is selected before a mill, and jointly enter a pulverized coal conveying pipeline and a coal hydro-gasification reactor to participate in gasification reaction, during the gasification reaction, the pulverized coal and the additives which are arranged between or outside the pulverized coal particles or the additives which are arranged outside the particles are decomposed at a relatively high temperature to generate synthesis gas or gas-phase light oil products, the yield of the products of coal hydro-gasification is increased to a certain degree, and the additives exist, and after partial reaction, colloid substances are generated during the reaction process, semicoke bonded with the superfine pulverized coal is crosslinked to form hollow or spherical semicoke with porous surfaces, so that the volume and the quality of single semicoke particles are increased, the dust carrying amount of the synthesis gas of the system after coal hydro-gasification is reduced, the load of post-treatment dust removal equipment is reduced, and the product cleanliness is improved.
The method can be used for treating the superfine coal powder separated by the mill by molding the superfine coal powder, and can also be used for directly treating the raw material which is already in the size range of the superfine coal powder, so that the application range of the superfine coal powder is enlarged, and the coal powder applicability of the coal hydro-gasification technology is improved.
Example 1
Mixing coal powder, water and an additive to obtain a mixed material, wherein the mass ratio of the water to the coal powder is 0.3: 1, the mass ratio of the additive to the coal powder is 0.05: 1, preparing micron-sized spherical pulverized coal particles from the mixed material through a forming device, and drying to form gaps between the outermost additive and pulverized coal.
Example 2
Mixing coal powder, water and an additive to obtain a mixed material, wherein the mass ratio of the water to the coal powder is 0.4: 1, the mass ratio of the additive to the coal powder is 0.1: 1, preparing micron-sized spherical pulverized coal particles from the mixed material through a forming device, and drying to form gaps between the outermost additive and pulverized coal.
Example 3
Mixing coal powder, water and an additive to obtain a mixed material, wherein the mass ratio of the water to the coal powder is 0.5: 1, the mass ratio of the additive to the coal powder is 0.15: 1, preparing micron-sized spherical pulverized coal particles from the mixed material through a forming device, and drying to form gaps between the outermost additive and pulverized coal.
Example 4
Mixing coal powder, water and an additive to obtain a mixed material, wherein the mass ratio of the water to the coal powder is 0.6: 1, the mass ratio of the additive to the coal powder is 0.2: 1, preparing micron-sized spherical pulverized coal particles from the mixed material through a forming device, and drying to form gaps between the outermost additive and pulverized coal.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method of processing a feedstock, comprising:
mixing coal powder, water and an additive to obtain a mixed material;
and forming the mixed material to obtain spherical particles, wherein gaps are formed between the outermost additive and the coal dust.
2. The feedstock treatment process according to claim 1, characterized in that: the mass ratio of the water to the pulverized coal is (0.3-0.6): 1.
3. the feedstock treatment process according to claim 1, characterized in that: the mass ratio of the additive to the pulverized coal is (0.05-0.2): 1.
4. the method of claim 1, wherein the step of mixing coal fines, water and additives to obtain a mixed material comprises: wetting the pulverized coal by water to form a water film outside the pulverized coal;
and adding the additive to wrap the additive on the outer layer of the water film.
5. The method of processing feedstock according to claim 4, wherein said method of obtaining a mixed feed comprises: dividing the total added mass M1 of the water into N equal parts, and dividing the total added mass M2 of the additive into N equal parts;
firstly, adding water with the mass of M1/N into the coal powder, uniformly mixing, adding an additive with the mass of M2/N, and uniformly mixing;
secondly, adding water with the mass of M1/N into the coal powder, uniformly mixing, adding an additive with the mass of M2/N, and uniformly mixing;
adding sequentially until the Nth time, adding the last part of M1/N water, mixing uniformly, adding the last part of M2/N additive, and mixing uniformly.
6. The method of processing feedstock according to claim 4, wherein said method of obtaining a mixed feed comprises: adding water accounting for 50% of the total mass of the required water into the pulverized coal, uniformly mixing, adding an additive accounting for 50% of the total mass of the required additive, and uniformly mixing;
and adding water accounting for 50% of the total mass of the required water, uniformly mixing, adding additives accounting for 50% of the total mass of the required additives, and uniformly mixing.
7. The raw material treatment method according to claim 1, wherein the additive is a polymer compound having a cohesive property and being decomposable at 400 to 1000 ℃.
8. The method according to claim 7, wherein the polymer compound contains carbon and hydrogen, and the polymer compound does not contain a metal element, sulfur, or chlorine.
9. The feedstock treatment process according to claim 1, wherein the additive comprises coal tar or miscellaneous oils remaining after coal tar refining.
10. The feedstock treatment process according to any one of claims 1 to 9, wherein the spherical particles have a particle size of 20 to 100 microns.
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