CN112920869A - Briquette coal preparation method and preparation system - Google Patents
Briquette coal preparation method and preparation system Download PDFInfo
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- CN112920869A CN112920869A CN202110095482.3A CN202110095482A CN112920869A CN 112920869 A CN112920869 A CN 112920869A CN 202110095482 A CN202110095482 A CN 202110095482A CN 112920869 A CN112920869 A CN 112920869A
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- 239000003245 coal Substances 0.000 title claims abstract description 119
- 239000004484 Briquette Substances 0.000 title claims abstract description 55
- 238000002360 preparation method Methods 0.000 title claims abstract description 33
- 238000000197 pyrolysis Methods 0.000 claims abstract description 142
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 74
- 239000003546 flue gas Substances 0.000 claims abstract description 73
- 238000001035 drying Methods 0.000 claims abstract description 52
- 239000007789 gas Substances 0.000 claims abstract description 46
- 239000000571 coke Substances 0.000 claims abstract description 37
- 239000002802 bituminous coal Substances 0.000 claims abstract description 30
- 239000000843 powder Substances 0.000 claims abstract description 28
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 238000003825 pressing Methods 0.000 claims abstract description 8
- 239000002245 particle Substances 0.000 claims description 44
- 239000011230 binding agent Substances 0.000 claims description 42
- 238000002485 combustion reaction Methods 0.000 claims description 34
- 238000002156 mixing Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 20
- 238000012216 screening Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 229920002472 Starch Polymers 0.000 claims description 10
- 239000002817 coal dust Substances 0.000 claims description 10
- 239000008107 starch Substances 0.000 claims description 10
- 235000019698 starch Nutrition 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 9
- 239000004115 Sodium Silicate Substances 0.000 claims description 6
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 6
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 5
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 5
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 5
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 5
- 239000000440 bentonite Substances 0.000 claims description 3
- 229910000278 bentonite Inorganic materials 0.000 claims description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims 1
- 239000000047 product Substances 0.000 description 19
- 238000001125 extrusion Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 239000006227 byproduct Substances 0.000 description 8
- 238000007580 dry-mixing Methods 0.000 description 8
- 239000000203 mixture Substances 0.000 description 6
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 5
- 239000003830 anthracite Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000002737 fuel gas Substances 0.000 description 4
- 239000008187 granular material Substances 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 238000004939 coking Methods 0.000 description 3
- 238000000748 compression moulding Methods 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000006872 improvement Effects 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
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/04—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of powdered coal
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
- C10B57/10—Drying
-
- 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
- C10L5/105—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders with a mixture of organic and inorganic 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
- C10L5/06—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
- C10L5/12—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders with inorganic 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
- C10L5/06—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
- C10L5/14—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders with organic binders
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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
- C10L2290/02—Combustion or pyrolysis
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- 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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- 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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- 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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- 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
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- Geochemistry & Mineralogy (AREA)
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Abstract
The invention relates to a briquette coal preparation method and a briquette coal preparation system, wherein the briquette coal preparation method comprises the following steps: drying and crushing bituminous coal to obtain coal powder; pyrolyzing the coal powder to obtain volatile components and pyrolysis coke, and condensing and separating the volatile components to obtain pyrolysis gas and pyrolysis oil; burning the obtained pyrolysis gas to provide heat for pyrolysis treatment, wherein high-temperature flue gas generated by burning is used as a heat source for drying wet type coal after pyrolysis treatment and utilization; pressing and forming the obtained pyrolytic coke serving as a coal raw material to obtain wet molded coal; the high-temperature flue gas after pyrolysis treatment is used as a heat source, the wet molded coal is dried to obtain molded coal and medium-temperature flue gas, and the medium-temperature flue gas is used as a heat source for drying bituminous coal. Based on the briquette preparation method and the briquette preparation system, the briquette is prepared by using bituminous coal as a raw material, the production cost is low, the energy utilization rate in the preparation process is high, and resources are saved.
Description
Technical Field
The invention belongs to the technical field of briquette preparation, and particularly relates to a briquette preparation method and a briquette preparation system.
Background
The energy structure of China is rich in coal, lean in oil and less in gas, and the energy is mainly coal. The loose coal is directly combusted, the combustion efficiency is low, meanwhile, the pollution to the environment is caused, the significance of environment protection, improvement of civil life and industrial structure adjustment is great for the development of clean coal briquettes, the coal briquettes are coal finished products which are formed by mechanical processing and pressing according to the proportion, mechanical strength and shape and size required by specific application and have certain strength, different sizes and different shapes, and the national standard of the coal briquettes requires that the volatile content is lower than 12%. The conventional briquette production raw materials are anthracite and semi-coke, and the method for preparing the briquette by directly using the high-volatile bituminous coal is less. The anthracite belongs to high-quality coal, belongs to coal with the largest coalification degree, and has high fixed carbon content, low volatile matter yield, high density, high hardness, high burning point and no smoke when in burning; the semi-coke is refined from high-quality coal, so the cost is high by using high-quality coal anthracite and semi-coke prepared from the high-quality coal as the raw materials for preparing the briquette. The bituminous coal is a kind of coal, is a product of further coal deterioration, has a moderate coalification degree, 80-90% of carbon content, 4-6% of hydrogen content and 10-15% of oxygen content, is widely distributed, is the most widely distributed coal in nature, has high carbon content and 10-40% of volatile matters, has high heat productivity and is next to anthracite coal, and therefore, the bituminous coal has an important significance for preparing the molded coal by taking the bituminous coal as a raw material.
Disclosure of Invention
The technical problem solved by the invention is as follows: the briquette coal preparation method and system are characterized by comprising the following steps:
s1, drying and crushing bituminous coal to obtain coal powder;
s2, pyrolyzing the coal powder to obtain volatile components and pyrolysis coke, and condensing and separating the volatile components to obtain pyrolysis gas and pyrolysis oil;
s3, combusting the obtained pyrolysis gas to provide heat for the pyrolysis treatment, wherein high-temperature flue gas generated by combustion is used as a heat source for drying wet coal in S4 after the high-temperature flue gas is utilized by the pyrolysis treatment;
pressing and forming the obtained pyrolytic coke serving as a coal raw material to obtain wet molded coal;
and S4, drying the wet coal to obtain briquette and medium-temperature flue gas by taking the high-temperature flue gas after pyrolysis treatment as a heat source, and taking the medium-temperature flue gas as a heat source for drying the bituminous coal in S1.
The technical scheme based on the invention can bring the following beneficial effects:
(1) the method for preparing the clean coal briquette takes the bituminous coal with high volatile content as the raw material to prepare the clean coal briquette, the bituminous coal raw material has wide source, low price and low price, the dependence of the traditional process on the anthracite is eliminated, and the production cost of the clean coal briquette is reduced.
(2) The bituminous coal is pyrolyzed to obtain volatile components and pyrolysis coke, wherein the volatile components comprise pyrolysis gas (methane, carbon monoxide, ethylene and the like), pyrolysis oil (high boiling point substances such as phenol, benzene and the like), HCN, ammonia, H2S and the like, and the pyrolysis coke is the anthracite-like coal with high carbon content and low volatile matter content. According to the briquette preparation method, on one hand, volatile components are condensed and separated to obtain byproduct pyrolysis oil which can be used for preparing chemical products or fuels, and on the other hand, pyrolysis gas does not need to be treated, direct combustion is performed to provide heat for pyrolysis treatment, and the coal byproduct pyrolysis gas is used for supplying heat, so that the production cost for preparing briquettes is reduced.
(3) After the heat generated by the combustion of the pyrolysis gas is utilized through pyrolysis treatment, the surplus heat is utilized again to dry the wet coal briquette, and then is used for drying the bituminous coal again, and the heat generated by the combustion of the pyrolysis gas is utilized in a gradient manner, so that the energy utilization rate is improved, and the resources are saved.
On the basis of the scheme, the invention can be further improved as follows:
further, the pyrolysis temperature is 500-700 ℃, and the pyrolysis time is 2-20 min; the temperature of the high-temperature flue gas after pyrolysis treatment and utilization is 200-300 ℃; the temperature of the medium-temperature flue gas is 100-150 ℃.
The pyrolysis coke obtained under the pyrolysis condition has less volatile components (the volatile component content is 5-10%), the dye obtained by subsequent preparation has less emission, and the molded coal has high thermal stability; generally, the drying (moisture removal) temperature of the high-volatile bituminous coal is 30-60 ℃, the temperature of the medium-temperature flue gas can meet the drying requirement of the bituminous coal, and the drying efficiency is high.
Further, the pressure of the pressing forming is 30KN-50 KN.
The powder is pressed and formed under the pressure condition, so that the dissipation of dust in the using process can be effectively reduced.
Specifically, the way of drying the wet coal formed by pressing by the medium-temperature flue gas is convection heat transfer.
Further, the method also comprises the step of screening the crushed bituminous coal, wherein the screening process comprises the following steps: screening the crushed bituminous coal to obtain coal dust particles with the particle size of 1-3mm and coal dust particles with the particle size of less than 1mm, and then mixing the coal dust particles with the particle size of 1-3mm and the coal dust particles with the particle size of less than 1mm according to the weight ratio of 1:4 to obtain the coal dust.
Therefore, the pyrolysis coke with different particle sizes can be obtained through pyrolysis, and the pyrolysis coke with different particle sizes is filled with each other in the forming process, so that the forming effect of the molded coal is good, and the strength is high.
Further, the wet briquette is obtained by mixing and press-forming pyrolytic coke, a binder and water, and the wet briquette comprises the following components in percentage by weight: 65-85% of pyrolytic coke, 5-15% of binder and 5-15% of water.
The pyrolysis coke is bonded by the binder and is subjected to compression molding to obtain wet molded coal, the wet molded coal is dried to obtain molded coal, the pyrolysis coke and the binder in the proportion are adopted, the loss of dust in the using process can be effectively reduced, the utilization rate of the pyrolysis coke is improved, the thermal stability is high, and after the burning, ash is bonded, so that the concentration of particles is greatly reduced.
Specifically, the mixed material (pyrolytic coke, binder and water) for making wet briquette is placed in a die and then is pressed into a shape by an extrusion forming machine.
Further, the binder consists of an organic binder and an inorganic binder, wherein the organic binder is selected from any one or more of gelatinized starch, sodium carboxymethyl cellulose or pyrolysis oil, and the inorganic binder is selected from any one or a combination of bentonite and sodium silicate in any proportion.
Therefore, the pyrolysis oil generated in the step two can be used as an organic binder and used for the binding and forming of the pyrolysis coke together with an inorganic binder, the binding strength, the heat productivity, the volatile content, the compressive strength and the like of the finally prepared coal can all meet the standards of the coal briquette, the pyrolysis oil is used as the organic binder and used for the preparation of the subsequent wet coal briquette, the effective utilization of the pyrolysis oil of the coal byproduct is realized, and the preparation cost of the coal briquette is reduced.
Specifically, when the organic binder is selected from gelatinized starch, sodium carboxymethyl cellulose or a mixture of the gelatinized starch and the sodium carboxymethyl cellulose, the mixing process of the pyrolytic coke, the binder and the water is as follows:
the method comprises the steps of firstly, carrying out dry mixing on solid raw material pyrolytic coke, an inorganic binder and an organic binder through a primary mixer, then, introducing the mixture into a secondary mixer, and then, adding water for wet mixing to obtain a mixed material which is used for preparing wet briquettes.
Specifically, when the organic binder is pyrolytic oil, or pyrolytic oil and gelatinized starch, or pyrolytic oil and sodium carboxymethyl cellulose, the mixing process of the pyrolytic coke, the binder and water is as follows:
the method comprises the steps of firstly, carrying out dry mixing on solid raw material pyrolytic coke, organic binder and inorganic binder except pyrolytic oil through a primary mixer, then, introducing the mixture into a secondary mixer, and then, adding water and pyrolytic oil for wet mixing to obtain a mixed material which is used for preparing wet coal. By adopting the mode, better mixing effect can be brought, the follow-up compression molding is convenient, and the finally obtained molded coal has high strength and high thermal stability.
Further, the weight percentage of the inorganic binder in the binder is 30-50%.
The briquette has good bonding effect, good briquette forming effect, high strength and good ash bonding effect.
The invention also provides a briquette preparation system, comprising: drying device, reducing mechanism, forming device and drying kiln still include: the drying device is provided with a medium-temperature flue gas inlet, and the drying kiln is internally provided with a high-temperature flue gas inlet and a medium-temperature flue gas outlet; the pyrolysis chamber is provided with a raw material inlet, a pyrolysis coke outlet and a volatile component outlet; the condenser is provided with a volatile component inlet, a pyrolysis oil outlet and a pyrolysis gas outlet, and the volatile component inlet is communicated with the volatile component outlet; the combustion chamber is provided with a pyrolysis gas inlet and a high-temperature flue gas outlet, the pyrolysis gas inlet is communicated with the pyrolysis gas outlet, the high-temperature flue gas outlet is communicated with the high-temperature flue gas inlet, and the medium-temperature flue gas outlet is communicated with the medium-temperature flue gas inlet.
Therefore, volatile components generated in a pyrolysis chamber of the pyrolysis reactor enter a condenser, by-product pyrolysis gas and by-product pyrolysis oil are obtained through condensation separation, the pyrolysis gas enters a combustion chamber through a pyrolysis gas inlet, high-temperature flue gas generated by combustion provides heat for the pyrolysis chamber, after pyrolysis treatment and utilization, high-temperature flue gas carrying surplus heat enters a drying kiln through a high-temperature flue gas inlet, and is reused for drying wet coal (generating medium-temperature flue gas), and the medium-temperature flue gas enters a drying device through a medium-temperature flue gas inlet to be used for drying bituminous coal, so that multi-level utilization of energy is realized.
Further, the pyrolysis chamber is arranged in the combustion chamber, and the pyrolysis reactor and the combustion chamber form a double-chamber structure.
The pyrolysis reactor is positioned in the combustion chamber, so that self-heating continuous pyrolysis is realized, pyrolysis energy does not need to be additionally provided, and the heat energy utilization rate is high.
Specifically, the volatile component inlet is communicated with the volatile component outlet through a first pipeline, and the pipeline and the combustion chamber are sealed through a sealing element; the pyrolysis gas inlet is connected with the pyrolysis gas outlet through a second pipeline; the high-temperature flue gas outlet is communicated with the high-temperature flue gas outlet through a third pipeline; and the middle-temperature flue gas outlet is communicated with the middle-temperature flue gas inlet through a fourth pipeline.
Furthermore, a standby gas inlet is arranged on the hot combustion chamber.
Thus, in the initial stage of pyrolysis, energy supply may be performed using fuel gas, and fuel gas replenishment may be performed when pyrolysis gas can be insufficient in heat for the pyrolysis reaction.
Specifically, the drying device is a pulverized coal dryer, the crushing device is a coal mill, and the forming device is an extrusion forming machine of an extrusion forming machine.
Specifically, moulded coal preparation system still includes screening plant, dosing unit and feeder, and screening plant is used for screening to the buggy granule that just can the coal pulverizer discharge gate come out, dosing unit is used for carrying out ratio, mixing to the buggy granule after the screening, feeder is used for adding the buggy after mixing to pyrolytic reaction ware.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural view of a briquette preparation system according to the present invention.
FIG. 2 is a flow chart of a briquette coal preparation method based on the present invention.
Detailed Description
The following detailed description of embodiments of the invention is intended to be illustrative, and is not to be construed as limiting the invention.
The invention will be described in further detail below with reference to the accompanying figures 1-2 and specific examples.
As shown in fig. 1, the briquette preparation system according to the present invention comprises: drying device, reducing mechanism, forming device and drying kiln still include: the drying device is provided with a medium-temperature flue gas inlet, and the drying kiln is internally provided with a high-temperature flue gas inlet and a medium-temperature flue gas outlet; the pyrolysis chamber is provided with a raw material inlet, a pyrolysis coke outlet and a volatile component outlet; the condenser is provided with a volatile component inlet, a pyrolysis oil outlet and a pyrolysis gas outlet, and the volatile component inlet is communicated with the volatile component outlet; the combustion chamber is provided with a pyrolysis gas inlet and a high-temperature flue gas outlet, the pyrolysis gas inlet is communicated with the pyrolysis gas outlet, the high-temperature flue gas outlet is communicated with the high-temperature flue gas inlet, and the medium-temperature flue gas outlet is communicated with the medium-temperature flue gas inlet. Volatile components generated in a pyrolysis chamber of the pyrolysis reactor enter a condenser, by-product pyrolysis gas and by-product pyrolysis oil are obtained through condensation separation, the pyrolysis gas enters a combustion chamber through a pyrolysis gas inlet, high-temperature flue gas generated by combustion provides heat for the pyrolysis chamber, after pyrolysis treatment and utilization, the high-temperature flue gas carrying surplus heat enters a drying kiln through a high-temperature flue gas inlet, dry and wet molded coal (generating medium-temperature flue gas) is reused, the medium-temperature flue gas enters a drying device through a medium-temperature flue gas inlet, and is used for drying bituminous coal, and multi-stage utilization of energy is achieved.
According to the briquette preparation system provided by the embodiment of the invention, the pyrolysis chamber is arranged in the combustion chamber, and the pyrolysis reactor and the combustion chamber form a double-chamber structure.
The pyrolysis reactor is positioned in the combustion chamber, so that self-heating continuous pyrolysis is realized, pyrolysis energy does not need to be additionally provided, and the heat energy utilization rate is high.
Specifically, the volatile component inlet is communicated with the volatile component outlet through a first pipeline, and the pipeline and the combustion chamber are sealed through a sealing element; the pyrolysis gas inlet is connected with the pyrolysis gas outlet through a second pipeline; the high-temperature flue gas outlet is communicated with the high-temperature flue gas outlet through a third pipeline; and the middle-temperature flue gas outlet is communicated with the middle-temperature flue gas inlet through a fourth pipeline.
According to the briquette preparation system provided by the embodiment of the invention, the hot combustion chamber is provided with the gas inlet.
Thus, in the initial stage of pyrolysis, energy supply may be performed using fuel gas, and fuel gas replenishment may be performed when pyrolysis gas can be insufficient in heat for the pyrolysis reaction.
Specifically, the drying device is a pulverized coal dryer, the crushing device is a coal mill, and the forming device is an extrusion forming machine of an extrusion forming machine.
Specifically, moulded coal preparation system still includes screening plant, dosing unit and feeder, and screening plant is used for screening to the buggy granule that just can the coal pulverizer discharge gate come out, dosing unit is used for carrying out ratio, mixing to the buggy granule after the screening, feeder is used for adding the buggy after mixing to pyrolytic reaction ware.
Example 1
As shown in fig. 1 and 2, a method for producing molded coal, comprising the steps of:
step one, drying the high-volatile bituminous coal by using the medium-temperature flue gas of the over-wet coal dried in the step five, crushing the bituminous coal on a coal mill, and screening the crushed coal powder to obtain coal powder particles with the particle size of less than 1mm and two kinds of coal powder particles with the particle size of 1-3 mm.
Step two, mixing the coal powder obtained in the step one according to the weight ratio of large particles (1-3mm) to small particles (less than 1mm) of 1:4, mixing, uniformly stirring, feeding by a powder feeder, pyrolyzing the mixed coal powder particles in a pyrolysis reactor to obtain volatile components and pyrolysis coke, and condensing and separating the volatile components to obtain pyrolysis gas and pyrolysis oil; and controlling the pyrolysis temperature to be 700 ℃, enabling coal powder particles to stay in a pyrolysis reactor for 2min, enabling pyrolysis energy to be derived from pyrolysis gas obtained by condensing volatile components and generating heat by combustion in a combustion chamber, and enabling high-temperature flue gas generated by combustion to be used as a heat source for drying the wet coal in the step five after being utilized by the pyrolysis reactor.
Step three: and (3) dry-mixing the semi-coke product obtained in the step two and a binder in a first-stage mixer, wherein the binder is prepared from gelatinized starch and sodium silicate, and the weight ratio of the gelatinized starch to the sodium silicate is 1: 1, the weight ratio of the binder to the semi-coking coal product is 1: 7.5; and (3) introducing the mixture into a second-stage mixer after the dry mixing is finished, and simultaneously adding atomized water for wet mixing to obtain a mixed material, wherein the weight ratio of the atomized water to the dry-mixed product is 3: 25.
step four: and (4) placing the mixed material obtained in the third step into a die, and performing compression molding by using extrusion molding under the pressure of 45KN to obtain the wet briquette.
Step five: and (3) drying the wet molded coal in the fourth step by using the high-temperature flue gas (300 ℃) generated in the second step, wherein the drying temperature is 105 ℃, and drying for 2 hours to obtain a molded coal finished product.
The obtained molded coal finished product is subjected to performance test, and the obtained molded coal has the heat productivity of 27MJ/kg, the volatile component (dry basis) content of 11.5 percent, the total sulfur content of 0.13 percent, the compressive strength of 515N and the drop strength of 99 percent.
Example 2
A method for producing briquette comprises the following steps:
the method comprises the following steps: and (3) drying the high-volatile bituminous coal by using medium-temperature flue gas of the over-wet coal dried in the step five, crushing the bituminous coal on a coal mill, and screening the crushed coal powder to obtain coal powder particles with the particle size of less than 1mm and two kinds of coal powder particles with the particle size of 1-3 mm.
Step two: and (3) mixing the coal powder particles obtained in the step one according to the weight ratio of large particles (1-3mm) to small particles (less than 1mm) of 1:4, mixing, uniformly stirring, feeding by a powder feeder, pyrolyzing the mixed coal powder particles in a pyrolysis reactor to obtain volatile components and pyrolysis coke, and condensing and separating the volatile components to obtain pyrolysis gas and pyrolysis oil; and controlling the pyrolysis temperature to be 600 ℃, enabling coal powder particles to stay in a pyrolysis reactor for 5min, enabling pyrolysis energy to be derived from pyrolysis gas obtained by condensing volatile components and generating heat by combustion in a combustion chamber, and enabling high-temperature flue gas generated by combustion to be used as a heat source for drying the wet coal in the step five after being utilized by the pyrolysis reactor.
Step three: and (3) dry-mixing the semi-coke product obtained in the step two and a binder in a first-stage mixer, wherein the binder is prepared from gelatinized starch and bentonite, and the weight ratio of the semi-coke product to the binder is 2: 1, the weight ratio of the binder to the semi-coking coal product is 1: 7.5; and (3) after the dry mixing is finished, introducing the mixture into a second-stage mixer, and simultaneously adding atomized water for wet mixing to obtain a mixed material, wherein the weight ratio of the atomized water to the dry mixed product is 4: 25.
step four: and (4) placing the mixed material obtained in the third step into a die, and pressing and molding by using an extrusion molding machine, wherein the pressure of the extrusion molding machine is 40KN, so that the wet briquette is obtained.
Step five: and (4) drying the wet molded coal in the fourth step by using the high-temperature flue gas (275 ℃) generated in the second step, wherein the drying temperature is 105 ℃, and drying for 2 hours to obtain a molded coal finished product.
The obtained molded coal finished product is subjected to performance test, the heat productivity is 26.7MJ/kg, the volatile component (dry basis) content is 11.1 percent, the total sulfur content is 0.12 percent, the compressive strength is 550N, and the drop strength is 98 percent.
Example 3
A method for producing briquette comprises the following steps:
the method comprises the following steps: and (3) drying the high-volatile bituminous coal by using the medium-temperature flue gas of the over-wet coal dried in the step five, crushing the bituminous coal on a coal mill, and screening the crushed coal powder to obtain coal powder particles with the particle size of less than 1mm and two kinds of coal powder particles with the particle size of 1-3 mm.
Step two: and (3) mixing the coal powder particles obtained in the step one according to the weight ratio of large particles (1-3mm) to small particles (less than 1mm) of 1:4, mixing, uniformly stirring, feeding by a powder feeder, pyrolyzing the mixed coal powder in a pyrolysis reactor to obtain volatile components and pyrolysis coke, and condensing and separating the volatile components to obtain pyrolysis gas and pyrolysis oil; wherein the pyrolysis temperature is controlled to be 650 ℃, the coal powder particles stay in a dragon of the pyrolysis reactor for 2min, pyrolysis energy is generated by burning pyrolysis gas obtained by condensing volatile components in a combustion chamber to generate heat, and high-temperature flue gas generated by burning is used as a heat source for drying the wet coal in the step five after being utilized by the pyrolysis reactor.
Step three: and (3) dry-mixing the semi-coke product obtained in the step two and a binder in a first-stage mixer, wherein the binder is prepared from gelatinized starch and sodium silicate, and the weight ratio of the gelatinized starch to the sodium silicate is 1: 2, the weight ratio of the binder to the semi-coking coal product is 1: 7.7; and (3) after the dry mixing is finished, introducing the mixture into a second-stage mixer, and simultaneously adding atomized water for wet mixing to obtain a mixed material, wherein the weight ratio of the atomized water to the dry mixed product is 3.5: 25.
step four: and (4) placing the mixed material obtained in the third step into a die, and pressing and molding by using an extrusion molding machine, wherein the pressure of the extrusion molding machine is 48KN, so that the wet briquette is obtained.
Step five: and (4) drying the wet molded coal in the fourth step by using the high-temperature flue gas (285 ℃) generated in the second step, wherein the drying temperature is 105 ℃, and drying for 2 hours to obtain a molded coal finished product.
The obtained molded coal finished product is subjected to performance test, the heat productivity is 27.2MJ/kg, the volatile component (dry basis) content is 11.7 percent, the total sulfur content is 0.14 percent, the compressive strength is 505N, and the drop strength is 99 percent.
Based on the briquette preparation method and the briquette preparation system, the clean briquette is prepared by utilizing the high-volatile-component soot, the raw materials are cheap, the price is low, and the dependence on the soot is eliminated; in the preparation process, pyrolysis oil generated by pyrolysis of the high-volatile-component bituminous coal is collected to obtain a byproduct, so that the economic benefit is increased; the heat generated by the combustion of the pyrolysis gas is utilized in multiple stages, so that the energy utilization rate is improved; after strength test, the prepared briquette is not easy to break, has high compressive strength and meets the requirements of national standards; through combustion experiments and tests, the prepared briquette has less pollutant discharge and high thermal stability, and after the briquette is burnt, ash content is bonded, so that the concentration of particulate matters is greatly reduced, the national standard requirements are met, and the briquette can be industrially popularized.
Although embodiments of the present invention have been described in detail above, those of ordinary skill in the art will understand that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The preparation method of the briquette is characterized by comprising the following steps:
s1, drying and crushing bituminous coal to obtain coal powder;
s2, pyrolyzing the coal powder to obtain volatile components and pyrolysis coke, and condensing and separating the volatile components to obtain pyrolysis gas and pyrolysis oil;
s3, combusting the obtained pyrolysis gas to provide heat for the pyrolysis treatment, wherein high-temperature flue gas generated by combustion is used as a heat source for drying wet coal in S4 after the high-temperature flue gas is utilized by the pyrolysis treatment;
pressing and forming the obtained pyrolytic coke serving as a coal raw material to obtain wet molded coal;
and S4, drying the wet coal to obtain briquette and medium-temperature flue gas by taking the high-temperature flue gas after pyrolysis treatment as a heat source, and taking the medium-temperature flue gas as a heat source for drying the bituminous coal in S1.
2. The method for preparing briquettes of claim 1, wherein the pyrolysis temperature is 500-700 ℃ and the pyrolysis time is 2-20 min; the temperature of the high-temperature flue gas after pyrolysis treatment and utilization is 200-300 ℃; the temperature of the medium-temperature flue gas is 100-150 ℃.
3. The method for producing briquettes of claim 1, wherein the press-molding pressure is 30KN to 50 KN.
4. The method for preparing briquettes of claim 1, further comprising a screening process after the bituminous coal is crushed, wherein the screening process comprises the steps of: screening the crushed bituminous coal to obtain coal dust particles with the particle size of 1-3mm and coal dust particles with the particle size of less than 1mm, and then mixing the coal dust particles with the particle size of 1-3mm and the coal dust particles with the particle size of less than 1mm according to the weight ratio of 1:4 to obtain the coal dust.
5. The preparation method of the briquette coal as claimed in claim 1, wherein the wet briquette coal is obtained by mixing and press-forming pyrolytic coke, a binder and water, and the wet briquette coal comprises the following components in percentage by weight: 65-85% of pyrolytic coke, 5-15% of binder and 5-15% of water.
6. The method for preparing the briquette coal as claimed in claim 5, wherein the binder consists of an organic binder and an inorganic binder, the organic binder is selected from any one or more of gelatinized starch, sodium carboxymethyl cellulose or the pyrolysis oil, and the inorganic binder is selected from any one or a combination of bentonite and sodium silicate in any proportion.
7. The method for preparing briquettes of claim 6, wherein the inorganic binder is 30-50% by weight of the binder.
8. A briquette coal preparation system, comprising: drying device, reducing mechanism, forming device and drying kiln, its characterized in that still includes: the drying device is provided with a medium-temperature flue gas inlet, and the drying kiln is internally provided with a high-temperature flue gas inlet and a medium-temperature flue gas outlet;
the pyrolysis chamber is provided with a raw material inlet, a pyrolysis coke outlet and a volatile component outlet;
the condenser is provided with a volatile component inlet, a pyrolysis oil outlet and a pyrolysis gas outlet, and the volatile component inlet is communicated with the volatile component outlet;
the combustion chamber is provided with a pyrolysis gas inlet and a high-temperature flue gas outlet, the pyrolysis gas inlet is communicated with the pyrolysis gas outlet, the high-temperature flue gas outlet is communicated with the high-temperature flue gas inlet, and the medium-temperature flue gas outlet is communicated with the medium-temperature flue gas inlet.
9. A system for making briquettes according to claim 8, wherein the pyrolysis chamber is disposed within the combustion chamber, and the pyrolysis reactor and the combustion chamber constitute a dual chamber structure.
10. A briquette coal preparation system as set forth in claim 8, wherein a back-up gas inlet is provided on the pyrolysis device.
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