EP2714862A1 - Method for producing charcoal - Google Patents
Method for producing charcoalInfo
- Publication number
- EP2714862A1 EP2714862A1 EP12731510.9A EP12731510A EP2714862A1 EP 2714862 A1 EP2714862 A1 EP 2714862A1 EP 12731510 A EP12731510 A EP 12731510A EP 2714862 A1 EP2714862 A1 EP 2714862A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- carbonization
- wood material
- conveyed
- particle
- charcoal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
- 239000003610 charcoal Substances 0.000 title claims abstract description 67
- 238000004519 manufacturing process Methods 0.000 title claims description 20
- 238000000034 method Methods 0.000 claims abstract description 49
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 9
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000005864 Sulphur Substances 0.000 claims abstract description 9
- 239000011574 phosphorus Substances 0.000 claims abstract description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 9
- 238000010924 continuous production Methods 0.000 claims abstract description 8
- 239000002023 wood Substances 0.000 claims description 120
- 239000000463 material Substances 0.000 claims description 107
- 238000003763 carbonization Methods 0.000 claims description 100
- 239000007789 gas Substances 0.000 claims description 58
- 238000001035 drying Methods 0.000 claims description 36
- 238000002485 combustion reaction Methods 0.000 claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 229910001868 water Inorganic materials 0.000 claims description 23
- 239000002956 ash Substances 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 16
- 239000012535 impurity Substances 0.000 claims description 15
- 238000000746 purification Methods 0.000 claims description 11
- 239000003039 volatile agent Substances 0.000 claims description 11
- 239000002351 wastewater Substances 0.000 claims description 11
- 239000000428 dust Substances 0.000 claims description 10
- 238000005201 scrubbing Methods 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 7
- 229910001021 Ferroalloy Inorganic materials 0.000 claims description 6
- 238000000638 solvent extraction Methods 0.000 claims description 6
- 230000006735 deficit Effects 0.000 claims description 5
- 238000010000 carbonizing Methods 0.000 claims description 4
- 239000002826 coolant Substances 0.000 claims description 4
- 238000005549 size reduction Methods 0.000 claims description 4
- 239000003643 water by type Substances 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 206010013786 Dry skin Diseases 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 239000000306 component Substances 0.000 description 6
- 239000000571 coke Substances 0.000 description 5
- 238000004939 coking Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 244000166124 Eucalyptus globulus Species 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 4
- 239000011269 tar Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910000604 Ferrochrome Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002916 wood waste Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 230000002730 additional effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000005539 carbonized material Substances 0.000 description 1
- 238000002144 chemical decomposition reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229940044949 eucalyptus oil Drugs 0.000 description 1
- 239000010642 eucalyptus oil Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000010310 metallurgical process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000005445 natural material Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
Classifications
-
- 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
- C10B49/00—Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated
- C10B49/02—Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with hot gases or vapours, e.g. hot gases obtained by partial combustion of the charge
- C10B49/04—Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with hot gases or vapours, e.g. hot gases obtained by partial combustion of the charge while moving the solid material to be treated
- C10B49/08—Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with hot gases or vapours, e.g. hot gases obtained by partial combustion of the charge while moving the solid material to be treated in dispersed form
- C10B49/10—Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with hot gases or vapours, e.g. hot gases obtained by partial combustion of the charge while moving the solid material to be treated in dispersed form according to the "fluidised bed" technique
-
- 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
- C10B53/02—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of cellulose-containing material
-
- 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
- C10L5/34—Other details of the shaped fuels, e.g. briquettes
- C10L5/36—Shape
- C10L5/361—Briquettes
-
- 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
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/44—Solid fuels essentially based on materials of non-mineral origin on vegetable substances
-
- 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
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/44—Solid fuels essentially based on materials of non-mineral origin on vegetable substances
- C10L5/442—Wood or forestry waste
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Definitions
- the invention relates to a method for continuous production of charcoal suitable for use in the metallurgical industry by a method where the pur- pose is to obtain charcoal having sufficient strength, low ash content as well as low phosphorus and sulphur content.
- Charcoal has been manufactured in batch fashion for thousands of years. Batch carbonization has been carried out for example in different kinds of pits, retorts or waggon retorts. Continuous carbonization is carried out for instance in a horizontal or vertical retort, drum kiln or fluidized bed reactor.
- charcoal is made from biomass or vegetal materials. These include various nutshells, waste generated in wood processing such as sawing waste, sawdust or bark.
- the trunks of the eucalyptus tree for example are used for making charcoal after the branches and leaves have been removed for the fabrication of eucalyptus oil.
- the continuous carbonization processes that occur in a vertical shaft kiln are represented by the Lambiotte and Lurgi processes.
- the wood material is fed into the furnace from the top of the furnace and travels through the drying, carbonizing and cooling steps in the furnace.
- the gases are conveyed upwards from below.
- the steps may be separated from each other by a gas-lock.
- the continuous coking of peat and wood in a drum kiln is described for example in CA application publication 1 054 088 (FI56549).
- the method is described in more detail as applied to the processing of eucalyptus wood, for example in the Master's thesis: Latva-Somppi, J.: Study of carbonization of eucalyptus, pages 25 - 28, Helsinki University of Technology 1989.
- First the wood material is chipped and after this it is dried by means of exhaust gases exiting a combustion chamber.
- the exhaust gases may be conveyed to a feed silo.
- the dried wood material is screened and fine material can be fed into the same combustion chamber in which the gas exiting coking is burned.
- the coking furnace functions on the coun- tercurrent principle, i.e. hot gases are fed into the furnace from the opposite end to the wood material.
- the carbonization temperature is 500-900°C depending on the requirements set for charcoal.
- the temperature required for carbonization is achieved by burning part of the gases formed in carbonization, and additional heat is obtained with an auxiliary burner.
- the gases, tar and fly ash formed in carbonization are burned in the combustion chamber as is the waste wood generated in wood chipping.
- the hot combustion gases are conveyed to a boiler, and water is fed into the piping thereof to produce pressurized steam and then electricity and district heat.
- the charcoal that is produced is cooled for example with water, after which the charcoal is classified. Fine carbon material can be briquetted or burned in the combustion chamber.
- the object of the present invention is to disclose a method for the continuous production of charcoal, which meets the quality criteria set by the metallurgical industry and in particular required for the fabrication of ferroal- loys.
- the invention relates to a method for the continuous production of charcoal to be used in the metallurgical industry, whereby wood material, which is debarked heartwood with the mechanical im- purities removed, that is to be processed in order to produce charcoal with low ash, sulphur and phosphorus content, sufficient strength and low volatiles content, is conveyed to partitioning treatment in order to reduce the wood material in size to a particle-like form, the wood material in particle-like form is dried and conveyed to high-temperature carbonization.
- the invention relates to a method for the continuous production of charcoal for use in the metallurgical industry, wherein in order to produce charcoal with low ash, sulphur and phosphorus content, sufficient strength and low volatiles content, the method comprises:
- the mechanical impurities are removed typically by vibrating screen or gravity separation.
- the carbonization of the wood material is carried out at a temperature of 800-1000°C. According to another embodiment of the invention the carbonization of the wood material is carried out at a temperature of 900-1000°C.
- the drying and carbonization of the wood material is carried out in separate reactors.
- the drying of the wood material is carried out in a fluidized bed reactor, in which the wood material to be treated forms the bed of the drying reactor.
- the carbonization of the wood material is carried out in a fluidized bed reactor, in which charcoal forms the bed of the carbonization reactor.
- drying and/or carbonization is carried out in drum furnaces.
- drying and carbonization of the wood material is carried out in a shaft furnace.
- the size of the particle-like wood material is 10-40 mm.
- the thermal energy generated in the post-combustion boiler is utilized in the power plant to produce electricity and district heat.
- the cooled exhaust gases of the post-combustion boiler are conveyed to the drying and carbonization of the particle-like wood material.
- the particle-like charcoal formed in carbonization is conveyed to indirect air cooling, from which hot air is fed into the carbonization reactor. According to another embodiment of the invention, the particle-like charcoal formed in carbonization is conveyed to indirect water cooling. According to yet another embodiment of the invention, the particle-like charcoal formed in carbonization is conveyed to direct cooling with inert gas.
- frozen wood material is de-iced before debarking.
- De-icing means that any possible ice on the fro- zen wood material is removed and the frozen wood material is defrosted.
- De- icing is preferably carried out using the hot gases generated in drying.
- the gases generated in de-icing are preferably conveyed to gas scrubbing, and the waters generated in de-icing and gas scrubbing are conveyed to the wastewater purification step before being discharged from the cycle.
- the dried wood material is carbonized in a carbonization reactor, where the first part of the gases and dust formed in wood material carbonization are burned in the carbonization reactor with an air deficit,
- the second part of the gases formed in wood material carbonization, the wood material bark and the dust formed in size reduction are fed to a post-combustion boiler, in which they are burned and the thermal energy generated is utilized to produce electricity and district heat and the cooled circulation gas is conveyed to the drying and carbonization of the particle-like wood material,
- frozen wood material is de-iced before debarking.
- Frozen wood material is de-iced preferably by means of the hot gases formed in drying.
- the gases generated in de-icing are conveyed to gas scrubbing, and the waters generated in de-icing are conveyed to the wastewater purification step before being discharged from the cycle.
- the charcoal When the object is to produce charcoal continuously for use in the metallurgical industry, such as in the reduction stage of ferroalloy production, the charcoal must fulfil certain criteria.
- the C fix content of the charcoal must be as high as possible, over 75 %, the amount of volatiles below 1 %, the amount of alkalis below 0.2 %, the sulphur content below 0.07 % and the phosphorus content below 0.03%.
- C fix means fixed carbon, which is not removed along with the volatiles into the tar substances or gases, but becomes a carbonization residue, from which the ash portion has been removed. All the percentages mentioned in the text indicate percentages by weight.
- Charcoal should also be sufficiently strong when hot, so that it does not disintegrate into dust when fed into a furnace.
- the electroconductivity of the charcoal should be sufficiently low.
- the lump size of metallurgical coke should be in the region of 10- 25 mm.
- Coarser coke cannot be used for example in the reduction of ferro- chrome, because its electroconductivity is too high.
- finer coke causes compression of the bed in the ferrochrome furnace and as a result un- even gas distribution.
- the fabrication of the kind of coke that has a high C fix content and a low amount of volatiles requires a high carbonization temperature, i.e. it should be at least 700°C.
- Heartwood means debarked wood. Carbonization or pyrolysis or coking means the physical and chemical decomposition of an organic solid substance in an oxygen-free space under the effect of heat. It is the step preceding actual combustion or gasification, in which the volatile substances contained in the fuel are removed as a result of thermal decomposition forming water vapour, gas and tar components. A porous carbonized residue or coke is left behind. Carbon generated from wood is called charcoal.
- the wood carbonization process can be divided into various stages.
- the first stage is drying or the evaporation of water, which occurs at tempera- tures of 100-200°C.
- the decomposition of the wood is still minor at this stage.
- the decomposition of wood material starts in the second stage, when mainly the oxygen-containing gases in the wood material are released. This occurs at a higher temperature, i.e. around 200-280°C, when carbon dioxide and carbon monoxide, water and water-soluble substances such as acetic acid are re- leased from the wood material.
- the third stage which occurs at temperatures of 280-500°C, could be called a hydrocarbon stage, and at this point the exothermic decomposition of the wood material or reaction proceeds by itself and produces heat.
- the carbonization process may be implemented as a continuous process at least in a retort, drum furnace and fluidized bed furnace.
- charcoal used for reduction of ferroalloys requires more stages than conventional charcoal production, which raises production costs. For this reason all secondary material generated during charcoal production should be exploited as well as possible, so that the overall process costs remain competitive.
- the advantage of charcoal is that it is produced from renewable natural material, it maximizes quality and minimizes the use of en- ergy, various emissions to air and water as well as the amount of waste produced.
- An embodiment of the method in accordance with the invention is illustrated by the flow chart according to the attached Figure 1 .
- the wood material to be processed such as saw timber, is conveyed to receiving area 1 . In some cases the wood material may be frozen, so it is conveyed first to de-icing treatment 2, which may be carried out using hot gas obtained from a later drying step 5.
- debarking takes place in a debarking drum for example.
- Wood bark contains 1 .5-3.5% ash, whereas for instance Finnish softwood contains 0.2-0.4%.
- Eucalyptus wood contains somewhat more ash than Finnish wood.
- ash contains calcium, silicon, magnesium, potassium, sodium, iron, phosphorus and sulphur among others, and the majority of the ash components end up in the charcoal.
- mechanical impurities such as sand may have adhered to the wood bark.
- the debarked wood material is reduced in size to particle-like form in partitioning treatment 4, in which it is given a uniform particle-like form.
- the preferred screen size, through which the particle-like material is passed, is 10-40 mm.
- the particle-like wood material, which has a moisture content of around 40-60%, is conveyed for example via a buffer silo to drying step 5. Drying takes place at a temperature of 100-200°C and after drying the moisture content of the wood material is in the order of 10-20%.
- the drying step may be carried out in a separate reactor such as a fluidized bed reactor, in which there is a bed formed of the wood material to be processed.
- drying can be performed in a separate drum furnace, from which the dried wood material is fed into the carbonization drum furnace.
- drying can be performed in a reactor of some other type than carbonization.
- the dry- ing step is performed for instance as a pre-treatment step in connection with a shaft furnace. The energy required for drying is obtained from the circulation gases of a post-combustion boiler 8. Drying of the wood material is a precondition for effective and complete carbonization. If necessary, the dried material is screened so that only material with the desired particle size is conveyed to carbonization.
- the debarked and dried wood material having a suitable particle size is conveyed to carbonization 6, which typically takes place at a temperature of 750-1000°C.
- the carbonization step can be carried out in a continuously operating reactor as described above, such as a fluidized bed furnace, drum furnace or shaft furnace.
- a fluidized bed reactor it is essential that the bed material is previously formed charcoal, so as to prevent impurities from contaminating the charcoal that is generated.
- Additional heating equipment is also arranged in the reactor (not shown in detail in the diagram), which is used for heating and, if necessary, for adjusting the temperature.
- Preheated combustion air is fed into the carbonization step and combustion takes place with an air deficit, i.e.
- the amount of air infeed is below the stoichiometric amount required for combustion. Therefore only the first part of the gases formed in carbonization are burned in the carbonization reactor. The majority of the energy required for carbonization is obtained from burning the gases and dusts formed in carbonization in the carbonization reactor. Addi- tional energy is obtained by means of supplementary heating equipment and by recycling the circulation gas of the post-combustion boiler 8 to the carbonization reactor in order to maintain an adequate temperature.
- the temperature of the circulation gas conveyed to carbonization is 200-300°C.
- the properties of charcoal formed in carbonization are affected substantially by the final car- bonization temperature and the rate of carbonization. When the carbonization temperature is high, as in the method of the invention, the product strength is improved and the volatiles content is decreased.
- the flue gases generated in the carbonization reactor contain, in addition to reducing components, carbon dioxide and water vapour, which may react with carbon at high temperatures, decreasing the charcoal yield. Howev- er, the proportion of loss reactions remains low because the wood material develops a lot of gas in carbonization, which prevents the wood material from coming into contact with the flue gases.
- the temperature of a carbonization reactor equipped with direct heating can be adjusted by means of additional air or additional heating equipment.
- the hot charcoal that is formed is cooled in a cooling reactor 7 by means of a cooling medium.
- the cooling medium may be water or air and in direct cooling an inert gas.
- the cooled charcoal is screened and stored.
- the air that is heated in the cooling can be used as the preheated air of the carbonization step. If water cooling is performed, the generated steam is conveyed to the piping of a post-combustion boiler 8.
- the cooled charcoal is screened and thus divided into the desired fractions. If so desired, the finest material can be briquetted using starch as binder.
- the flue gases that contain the second part of the gaseous, liquid and solid components formed in the carbonization reactor 6, are conveyed to the post-combustion boiler 8 and burned there.
- the combustion temperature in the boiler is adjusted to be such that the ash components do not melt. It is preferable to burn in the post-combustion boiler also the bark material produced in wood material debarking 3, from which the water was pressed out in stage 10. Likewise, it is advantageous to burn the dust generated in drying step 5 in the post-combustion boiler.
- the energy produced is transferred via the walls and other heat transfer surfaces of the boiler, generating steam from the water fed into the heat transfer piping.
- the steam generated is conveyed to power plant 9, where it is used to produce electricity and district heat.
- the cooled circulation gas removed from the boiler which has a temperature of around 200-300°C, is conveyed to carbonization and drying.
- the aqueous solution produced by a bark press 10 is fed to wastewater purification step 1 1 .
- the wastewater generated in any de-icing 2 of the wood material is also conveyed to this purification step.
- the exhaust gases formed in the de- icing step are conveyed to condenser gas scrubbing 12, where they are scrubbed with a suitable scrubbing solution. After gas scrubbing the gases can be removed from the cycle and the wastewater that is generated is conveyed to purification step 1 1 , after which the water cleaned of impurities can also be removed from the cycle.
- the amount of dried wood material conveyed to carbonization is 25 t/h. 4.5 t/h of charcoal is generated in carbonization.
- the temperature of the gas exiting the carbonization stage is around 900°C and it is 35000 Nm 3 /h in quantity.
- the gas of carbonization step is conveyed to the post- combustion boiler where it is burned and the resulting thermal energy is transferred to the water and steam circulating in the boiler pipes, which are conveyed on to the production of electricity and district heat.
- the gas burned in the boiler produces 71 MWh/h of energy.
- the temperature of the gas removed from the boiler for circulation is around 300°C.
- the table presents an example comparison of the effect of temperature on charcoal quality.
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- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Wood Science & Technology (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Forests & Forestry (AREA)
- General Engineering & Computer Science (AREA)
- Dispersion Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Processing Of Solid Wastes (AREA)
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14182085.2A EP2829589B1 (en) | 2011-05-27 | 2012-05-25 | Method for producing charcoal |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI20110180A FI20110180A0 (fi) | 2011-05-27 | 2011-05-27 | Menetelmä puuhiilen valmistamiseksi |
PCT/FI2012/050505 WO2012164160A1 (en) | 2011-05-27 | 2012-05-25 | Method for producing charcoal |
Related Child Applications (1)
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EP14182085.2A Division EP2829589B1 (en) | 2011-05-27 | 2012-05-25 | Method for producing charcoal |
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EP2714862A1 true EP2714862A1 (en) | 2014-04-09 |
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Family Applications (4)
Application Number | Title | Priority Date | Filing Date |
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EP14182085.2A Active EP2829589B1 (en) | 2011-05-27 | 2012-05-25 | Method for producing charcoal |
EP12731510.9A Ceased EP2714862A1 (en) | 2011-05-27 | 2012-05-25 | Method for producing charcoal |
EP12731511.7A Active EP2714863B1 (en) | 2011-05-27 | 2012-05-28 | Method for producing bio-coke |
EP14182084.5A Active EP2829588B1 (en) | 2011-05-27 | 2012-05-28 | Method for producing bio-coke |
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EP14182085.2A Active EP2829589B1 (en) | 2011-05-27 | 2012-05-25 | Method for producing charcoal |
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EP12731511.7A Active EP2714863B1 (en) | 2011-05-27 | 2012-05-28 | Method for producing bio-coke |
EP14182084.5A Active EP2829588B1 (en) | 2011-05-27 | 2012-05-28 | Method for producing bio-coke |
Country Status (6)
Country | Link |
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EP (4) | EP2829589B1 (es) |
BR (2) | BR112013030422A2 (es) |
CA (2) | CA2836833C (es) |
CL (2) | CL2013003396A1 (es) |
FI (1) | FI20110180A0 (es) |
WO (2) | WO2012164160A1 (es) |
Families Citing this family (14)
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CN102899113A (zh) * | 2012-11-05 | 2013-01-30 | 青岛华泰锅炉热电设备有限公司 | 一种生物质型煤成型系统 |
NO20141486A1 (no) * | 2014-12-09 | 2016-06-10 | Elkem As | Energieffektiv integrert fremgangsmåte for fremstilling av metaller eller legeringer |
CN104974773B (zh) * | 2015-06-01 | 2017-07-28 | 农业部规划设计研究院 | 一种闭式热解炭化多联产工艺 |
US10995274B2 (en) | 2015-07-21 | 2021-05-04 | British Columbia Biocarbon Ltd. | Biocoal fuel product and processes and systems for the production thereof |
EP3624933A4 (en) | 2017-05-16 | 2021-02-17 | Massachusetts Institute of Technology | BIOMASS CONVERSION REACTORS AND ASSOCIATED SYSTEMS AND PROCESSES |
CN107474862A (zh) * | 2017-08-29 | 2017-12-15 | 太原理工大学 | 一种民用洁净焦炭及其加工方法 |
CN107353920A (zh) * | 2017-08-29 | 2017-11-17 | 太原理工大学 | 一种民用洁净焦炭及其制备工艺 |
CN107384461A (zh) * | 2017-08-29 | 2017-11-24 | 太原理工大学 | 一种民用洁净焦炭及其加工工艺 |
CN107353921A (zh) * | 2017-08-29 | 2017-11-17 | 太原理工大学 | 一种民用洁净焦炭及其生产工艺 |
CN107384460A (zh) * | 2017-08-29 | 2017-11-24 | 太原理工大学 | 一种民用洁净焦炭及其制备方法 |
US12065621B2 (en) * | 2020-01-14 | 2024-08-20 | Riki Franco | Sawdust charcoal |
US11624036B2 (en) * | 2020-01-14 | 2023-04-11 | Riki Franco | Sawdust charcoal |
WO2023283290A1 (en) | 2021-07-09 | 2023-01-12 | Carbon Technology Holdings, LLC | Processes for producing biocarbon pellets with high fixed-carbon content and optimized reactivity, and biocarbon pellets obtained therefrom |
US20230323229A1 (en) * | 2022-03-15 | 2023-10-12 | Carbon Technology Holdings, LLC | Processes and systems for producing biocoke in a kinetic interface reactor, and biocoke produced therefrom |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3977947A (en) | 1972-07-26 | 1976-08-31 | The Kingsford Company | Fluidized bed carbonization |
FI56549C (fi) * | 1974-02-12 | 1980-02-11 | Outokumpu Oy | Foerfarande foer kontinuerlig koksning av torv brunkol trae och dylikt i partikelform |
DE2523238A1 (de) * | 1975-05-26 | 1976-12-09 | Patra Patent Treuhand | Verfahren zur herstellung von holzkohle, vorzugsweise zur weiterverarbeitung zu aktivkohle, sowie versandeinheit fuer diese |
US4510021A (en) | 1979-07-25 | 1985-04-09 | Energy Products Of Idaho | Fluidized bed charcoal particle production system |
EP1242563A1 (en) | 1999-05-04 | 2002-09-25 | Commonwealth Scientific And Industrial Research Organisation | Process for carbonizing wood residues and producing activated carbon |
AU2003226528A1 (en) * | 2002-04-06 | 2003-10-27 | Biojoule Limited | Production of compact biomass fuel |
AT505516B1 (de) * | 2007-07-27 | 2009-03-15 | Schoerkhuber Johannes | Verfahren zur herstellung von holzpellets aus hackgut |
US8217212B2 (en) * | 2009-04-01 | 2012-07-10 | Paoluccio John A | Sequencing retort liquid phase torrefication processing apparatus and method |
-
2011
- 2011-05-27 FI FI20110180A patent/FI20110180A0/fi not_active Application Discontinuation
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2012
- 2012-05-25 EP EP14182085.2A patent/EP2829589B1/en active Active
- 2012-05-25 BR BR112013030422A patent/BR112013030422A2/pt not_active Application Discontinuation
- 2012-05-25 EP EP12731510.9A patent/EP2714862A1/en not_active Ceased
- 2012-05-25 CA CA2836833A patent/CA2836833C/en not_active Expired - Fee Related
- 2012-05-25 WO PCT/FI2012/050505 patent/WO2012164160A1/en active Application Filing
- 2012-05-28 WO PCT/FI2012/050512 patent/WO2012164162A1/en active Application Filing
- 2012-05-28 CA CA2836840A patent/CA2836840C/en not_active Expired - Fee Related
- 2012-05-28 EP EP12731511.7A patent/EP2714863B1/en active Active
- 2012-05-28 EP EP14182084.5A patent/EP2829588B1/en active Active
- 2012-05-28 BR BR112013030423A patent/BR112013030423A2/pt not_active Application Discontinuation
-
2013
- 2013-11-26 CL CL2013003396A patent/CL2013003396A1/es unknown
- 2013-11-26 CL CL2013003394A patent/CL2013003394A1/es unknown
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Also Published As
Publication number | Publication date |
---|---|
CA2836840C (en) | 2017-02-28 |
EP2714863B1 (en) | 2018-09-12 |
CA2836833C (en) | 2016-06-28 |
BR112013030423A2 (pt) | 2017-03-01 |
EP2829588B1 (en) | 2017-03-15 |
EP2829588A8 (en) | 2015-04-22 |
CL2013003394A1 (es) | 2014-06-06 |
CA2836840A1 (en) | 2012-12-06 |
WO2012164162A1 (en) | 2012-12-06 |
EP2829588A1 (en) | 2015-01-28 |
EP2829589B1 (en) | 2017-02-22 |
CA2836833A1 (en) | 2012-12-06 |
BR112013030422A2 (pt) | 2017-03-21 |
WO2012164160A1 (en) | 2012-12-06 |
EP2829589A1 (en) | 2015-01-28 |
EP2714863A1 (en) | 2014-04-09 |
FI20110180A0 (fi) | 2011-05-27 |
CL2013003396A1 (es) | 2014-06-06 |
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