WO2008098311A1 - Procédé de séchage et de gazéification - Google Patents

Procédé de séchage et de gazéification Download PDF

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Publication number
WO2008098311A1
WO2008098311A1 PCT/AU2008/000206 AU2008000206W WO2008098311A1 WO 2008098311 A1 WO2008098311 A1 WO 2008098311A1 AU 2008000206 W AU2008000206 W AU 2008000206W WO 2008098311 A1 WO2008098311 A1 WO 2008098311A1
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WO
WIPO (PCT)
Prior art keywords
gas
carbonaceous substance
process according
carbonaceous
hot gas
Prior art date
Application number
PCT/AU2008/000206
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English (en)
Inventor
David Cork
Original Assignee
Corky's Carbon And Combustion Pty Ltd
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Filing date
Publication date
Priority claimed from AU2007900841A external-priority patent/AU2007900841A0/en
Application filed by Corky's Carbon And Combustion Pty Ltd filed Critical Corky's Carbon And Combustion Pty Ltd
Priority to US12/527,156 priority Critical patent/US20100115841A1/en
Priority to EP08706089A priority patent/EP2121874A4/fr
Priority to AU2008215182A priority patent/AU2008215182B2/en
Priority to CA002678400A priority patent/CA2678400A1/fr
Priority to NZ579390A priority patent/NZ579390A/en
Publication of WO2008098311A1 publication Critical patent/WO2008098311A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • 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
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46—Gasification of granular or pulverulent flues in suspension
    • C10J3/48—Apparatus; Plants
    • C10J3/482—Gasifiers with stationary fluidised bed
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/58—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels combined with pre-distillation of the fuel
    • C10J3/60—Processes
    • C10J3/62—Processes with separate withdrawal of the distillation products
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/58—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels combined with pre-distillation of the fuel
    • C10J3/60—Processes
    • C10J3/64—Processes with decomposition of the distillation products
    • C10J3/66—Processes with decomposition of the distillation products by introducing them into the gasification zone
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/002—Removal of contaminants
    • C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
    • C10K1/004—Sulfur containing contaminants, e.g. hydrogen sulfide
    • 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
    • C10L9/08—Treating solid fuels to improve their combustion by heat treatments, e.g. calcining
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/001—Heating arrangements using waste heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/005—Treatment of dryer exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
    • F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed
    • F26B3/084—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed with heat exchange taking place in the fluidised bed, e.g. combined direct and indirect heat exchange
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0903—Feed preparation
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0903—Feed preparation
    • C10J2300/0909—Drying
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0913—Carbonaceous raw material
    • C10J2300/0916—Biomass
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0913—Carbonaceous raw material
    • C10J2300/093—Coal
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0913—Carbonaceous raw material
    • C10J2300/0946—Waste, e.g. MSW, tires, glass, tar sand, peat, paper, lignite, oil shale
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0953—Gasifying agents
    • C10J2300/0956—Air or oxygen enriched air
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0953—Gasifying agents
    • C10J2300/0973—Water
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/16—Integration of gasification processes with another plant or parts within the plant
    • C10J2300/1603—Integration of gasification processes with another plant or parts within the plant with gas treatment
    • C10J2300/1606—Combustion processes
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/16—Integration of gasification processes with another plant or parts within the plant
    • C10J2300/164—Integration of gasification processes with another plant or parts within the plant with conversion of synthesis gas
    • C10J2300/1643—Conversion of synthesis gas to energy
    • C10J2300/165—Conversion of synthesis gas to energy integrated with a gas turbine or gas motor
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/16—Integration of gasification processes with another plant or parts within the plant
    • C10J2300/164—Integration of gasification processes with another plant or parts within the plant with conversion of synthesis gas
    • C10J2300/1656—Conversion of synthesis gas to chemicals
    • C10J2300/1659—Conversion of synthesis gas to chemicals to liquid hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/16—Integration of gasification processes with another plant or parts within the plant
    • C10J2300/164—Integration of gasification processes with another plant or parts within the plant with conversion of synthesis gas
    • C10J2300/1656—Conversion of synthesis gas to chemicals
    • C10J2300/1665—Conversion of synthesis gas to chemicals to alcohols, e.g. methanol or ethanol
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/18—Details of the gasification process, e.g. loops, autothermal operation
    • C10J2300/1807—Recycle loops, e.g. gas, solids, heating medium, water
    • 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
    • Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
    • 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
    • Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
    • Y02E20/18—Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]
    • 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
    • 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
    • Y02P20/141—Feedstock
    • Y02P20/145—Feedstock the feedstock being materials of biological origin
    • 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
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Definitions

  • the present invention relates to a process for drying and subsequently gasifying a carbonaceous substance and in particular a process using carbonaceous substances that have high moisture content.
  • biomass is a renewable energy source that can provide a genuine alternative to coal in that it can be used for base load electricity generation.
  • biomass has failed to make a wide spread difference to the local or global energy market for two reasons:
  • Biomass typically has a very high moisture content of 30 to 80%. This usually results in a larger and more expensive boiler plant and lower conversion efficiency of thermal to electrical energy.
  • Biomass is distributed across large areas of land, making collection and transport to a central power station prohibitively expensive.
  • Fluidised bed gasif ⁇ ers accept a large range of biomasses and have a wide size distribution but are traditionally unacceptable for use with reciprocating internal combustion engines due to excessive tar carryover.
  • biomasses such as manure are relatively concentrated at poultry sheds and feed lots. Unfortunately these biomasses emit ammonia at temperatures near 100 0 C and sulphurous compounds, like H 2 S and COS, between 150 and 300 0 C. In addition, the waste from poultry sheds often includes dead chickens which could also be used as a biomass fuel source, however these give off hydrogen cyanide when heated to temperatures around 300 0 C.
  • IDGCC integrated drying gasification combined- cycle
  • IDGCC integrated drying gasification combined- cycle
  • the IDGCC process initially dries the brown coal to remove surface moisture content prior to feeding it into a gasifier.
  • the integrated drying concept removes the surface moisture of the raw coal under pressure by direct contact with the hot gas leaving the gasifier.
  • the dried coal then goes directly to the gasifier and the cooled and humidified gas is cleaned and sent to a gas turbine combined-cycle plant.
  • air as the gasifying agent, the calorific value of the gas is very low, but it is acceptable for combustion in a gas turbine.
  • the gasifier operates at a temperature of over 950 0 C with air plus some steam as the gasifying agent.
  • the hot gas leaving the gasifier at the top passes through a cyclone that returns most of the carry-over dust back to the gasifier.
  • the gas is subsequently burnt in a gas turbine.
  • the HRL design cannot separate ammonia and sulphurous compounds from the exhaust gas and all these undesirable gases pass through to the turbine.
  • the HRL design would have minor tar carryover which is not a problem with a gas turbine as the gas is burnt outside the turbine. However, it is a problem with gas engines where the gas is burnt inside the engine.
  • a Steam Fluidised Bed Drying concept developed at Monash University involved drying the coal in a superheated steam fluidised bed with the product water vapour recompressed to provide the fluidising steam, with the bulk of the steam condensing in a heat exchanger immersed in the bed.
  • the process offers major efficiency advantages over conventional evaporative drying systems, while the steam fluidising medium provides major safety benefits. This idea has not been commercialised due to the poor heat transfer between the steam tubes and the coal.
  • the Danish "Viking Gasifier” is a biomass version of a small scale integrated dryer gasifier.
  • This gasifier is a two-step gasification unit with a screw conveyer acting as an externally heated pyrolyser and an auto thermal char gasifier.
  • the biomass is fed directly in to the horizontal screw pyrolyser who has externally heated walls off about 600°C.
  • the fuel is dried and pyrolysed during 30-60 minutes leaving dry char and volatiles as result.
  • Gas released from the pyrolysis enters the oxidation zone where it is mixed with steam and some air to combust a small part of the pyrolysis gas which elevate the temperature to about 1150-1400°C.
  • the high temperature decomposes almost all tars to simple gases in a fraction of a second, but some soot is formed.
  • the char leaves the pyrolyser it falls down through the oxidation zone to the bottom of the actual gasifier that is a solid bed down-draft gasifier.
  • Steam and char gasification is a highly endothermic reaction so the temperature decreases about 100°C through the bed; from 700 to 600°C.
  • the glowing char bed also decreases tar content in the produced gas to between 10 to 30 mg/Nm 3 before it leaves the reactor.
  • the Viking gasifier has the advantage of low tar content syngas without an extra tar cracker step.
  • the slowest process step of the Viking Gasifier is the indirect dryer leading to the patent suggesting using a superheated steam dryer as a possible pre-step.
  • a superheated steam dryer as a possible pre-step.
  • Viking gasifer has low syn-gas CV leading to higher capital cost per KW at the gas engine and low power output for the plants size.
  • the present invention provides a process for producing syngas from a carbonaceous substance and/or treating a carbonaceous substance, the process including the following steps: a) reducing the surface moisture of the carbonaceous substance; b) reducing the inherent moisture of the carbonaceous substance; and, c) gasifying the carbonaceous substance to produce syngas, wherein at step a) the carbonaceous substance is directly contacted with a hot gas at a temperature of between 5O 0 C to 250°C, and/or the carbonaceous substance is indirectly contacted with saturated steam at a temperature of between 105°C and 25O 0 C.
  • the hot gas is a waste gas from a combustion process, or, the hot gas is indirectly heated by waste heat before contacting the carbonaceous substance.
  • the carbonaceous substance is at least partially fluidised when contacted with the hot gas and the temperature of the carbonaceous substance is between 25°C and 100 0 C after step a) and before step b) and the surface moisture content of the carbonaceous substance is reduced compared to the its surface moisture content prior to step a).
  • the carbonaceous substance is directly contacted with a hot gas at a temperature of 100°C and 300°C, and may, or may not, be indirectly contacted with saturated steam at a temperature of between 15O 0 C and 250 0 C.
  • the hot gas is a waste gas from a combustion process, or, the hot gas is indirectly heated by waste heat before contacting the carbonaceous substance.
  • the hot gas has a reduced oxygen content from that of air wherein the oxygen content in the hot gas is from between 2% to 15% volume.
  • the carbonaceous substance is at least partially fluidised when contacted with the hot gas and/or the temperature of the carbonaceous substance is typically between 8O 0 C and 150 0 C and the moisture content of the carbonaceous substance typically is from 2% to 20% wt after step b) and before step c).
  • the outlet gas from step a) and/or step b), produced after the hot gas directly contacts the carbonaceous substance, is directed to a water recovery process step to recover the moisture removed from the carbonaceous substance and/or the outlet gas is treated to remove potentially hazardous gaseous compounds yielded from the carbonaceous substance, such as for example ammonia and hydrogen cyanide.
  • the carbonaceous material is contacted with hot gas at a temperature of between 500°C and 1000 0 C yielding a gas stream of syngas and solid char.
  • the carbonaceous material is at least partially heated by low temperate oxidation of the carbonaceous material wherein oxygen is added to the hot gas before being contacted with the carbonaceous material at step c) to control the degree of low temperature oxidation of the carbonaceous material.
  • the carbonaceous material is contacted with hot gas at a temperature of between 200°C and 500 0 C yielding a gas stream of low CV syngas and a carbonaceous substance that is at least partially pyrolised wherein the syngas produced by the process is combusted to form the hot gas, and/or the waste heat utilised in step a), step b) and/or step c).
  • the partially pyrolised carbonaceous substance is used as a feed stock for a combustion process such as a for example a boiler for power generation.
  • the partially pyrolised carbonaceous substance is gasified in a further step to produce a higher CV syngas which may be used in a gas engine or gas turbine.
  • the high CV syngas is cooled to a temperature of between 3 0 C and 25 0 C and excess water separated from the gas stream wherein the excess water separated from the gas stream is recycled and injected into the gasification steps c) and/or the further gasification step.
  • the carbonaceous material is chosen from a material, or a mixture of materials, that has a relatively high moisture content and/or low cross over temperature such as for example low rank coal including brown and/or sub-bituminous coal, biomass including wood and bagasse, tar sands, municipal solid waste, agricultural or farming waste, animal waste, human waste or a mixture thereof.
  • the carbonaceous substance is substantially granular.
  • Figure 1 includes graphical representations of CATA runs from Macquarie university
  • Figure 2 is a graphical representation of the sensitivity of Red Gum Gasification to
  • FIG. 3 is a process flow diagram in accordance with one embodiment of the present invention.
  • Figure 4 is a process flow diagram in accordance with another embodiment of the present invention.
  • Figure 5 is a process flow diagram of a further embodiment of the present invention.
  • Figure 6 is a process flow diagram of a further embodiment of the present invention.
  • gas refers to a gas mixture that includes varying amounts of carbon monoxide, methane and hydrogen generated by the gasification of a carbonaceous substance to a gaseous product with a heating value.
  • carbonaceous substance refers to a substance that is consisting of, containing of, or capable of yielding carbon.
  • the present invention provides an integrated process for drying and partial gasification of a carbonaceous substance including biomass, peat, agricultural and/or municipal waste, low rank coal and tar sands.
  • the process includes the following steps: a) reducing the surface moisture of the carbonaceous substance; b) reducing the inherent moisture of the carbonaceous substance; and, c) gasifying the carbonaceous substance to produce syngas or boiler fuel.
  • the process is particularly suited to using carbonaceous substances that have a high moisture content.
  • the carbonaceous substance is contacted with a hot gas.
  • the hot gas is preferably chosen from air, or a waste gas from a combustion process (eg gas engine exhaust or waste gas) and at a temperature of between 5O 0 C and 25O 0 C which has the effect of driving off the surface moisture of the carbonaceous substance.
  • the carbonaceous substance is also indirectly contacted with saturated steam at step a, where the temperature of the saturated steam is between 105 0 C to 250 0 C.
  • process step a) can be carried out in a side blown partially fluidised bed reactor such as that described in WO 2007/137330.
  • the carbonaceous substance moves as a bed through the reactor where it is contacted by hot gas at about 3 kPa to 8kPa being introduced from the side of the reactor which partially fluidises the carbonaceous substance removing surface moisture and gently heating up the carbonaceous substance such that the material exiting step a) is at a temperature of between 25°C to 100 0 C and some, and preferably most of the surface moisture is removed.
  • the carbonaceous substance is indirectly contacted by saturated steam moving through pipes integral with the bed and that are in contact with the carbonaceous substance moving through the fluidised bed. This aids in suppling heat to the hot gas and carbonaceous substance assisting the removal of surface moisture.
  • the now warm carbonaceous substance exiting step a) is again directly contacted with a hot gas typically in the range of between 150 0 C and 25O 0 C.
  • a hot gas typically in the range of between 150 0 C and 25O 0 C.
  • the hot gas has a reduced oxygen content to that of air wherein the oxygen level is between
  • the hot gas is a waste gas from a combustion process, and may be chosen from the exhaust gas produced from combusting the syngas produced at step c).
  • the carbonaceous substance is also indirectly contacted with saturated steam at a temperature of 15O 0 C to 250°C which assists in reducing the inherent moisture content of the carbonaceous substance.
  • process step b) can be carried out in a side blown partially fluidised bed reactor such as that described in WO 2007/137330.
  • the carbonaceous substance moves as a bed through the reactor where it is contacted by hot gas with reduced oxygen content at 15O 0 C to 250 0 C and 3 kPa to SkPa being introduced from the side of the reactor which partially fluidises the carbonaceous substance reducing the inherent moisture and further heating up the carbonaceous substance such that the material exiting step b) is at a temperature of between 80 0 C to 150 0 C and at a moisture content of 2% to 20% .
  • step a) and step b) may be connected, or separated, depending on the desirability of keeping the exhaust gases separate.
  • the exhaust gases that are given off from both steps a) and b) may be treated to remove their moisture content and recover water taken from the carbonaceous substance as well as removing potentially undesirable gaseous products. If a carbonaceous substance including chicken or pig manure is used, the this product gives off ammonia and hydrogen cyanide when heated to temperatures of between 100 0 C and 200 0 C. By removing the exhaust gas and scrubbing them after process step a) and/or b) these undesirable products can be removed allowing the disposal of the subsequent waste in the form of water or particulate matter.
  • the third gasification process step c) can be done in various ways depending on the desired gas energy density (CV), tolerance of tar carryover and reactivity of the carbonaceous material.
  • the carbonaceous material is contacted with hot waste gas at a temperature not exceeding 450°C yielding a gas stream of a very low CV syn-gas and char, and ash.
  • This gasifying waste gas may be tempered with steam and oxygen to reduce tar carryover or to increase the gas CV.
  • Oxygen may be added to the gas stream achieve the desired operating temperature in the gasifier.
  • This gasification step is much lower in temperature than typical gasification steps, and does not completely gasify the carbonaceous material leaving a product that may be used as a boiler fuel.
  • this step is referred to as CO 2 Removal dryer and/or gasification step as this step removes a portion of the oxygen in the carbonaceous feed in the form of evolved CO 2 .
  • the exhaust gas or syngas produced is burnt in after burners and use as a low grade waste heat.
  • This embodiment is more suited to gas use in a gas turbine or as a pre-process to a traditional open cycle power plant
  • step c) which has higher temperature where the gas used in other subsequent steps and the feed from step B is also hotter.
  • gasifier as the unit is operated more like a conventional gasifier.
  • This approach leads to hotter char entering any subsequent steps.
  • the char entrance temperature needs to be hotter than 400 0 C for low tar yield operations in the subsequent step.
  • the corresponding temperature for lignite is hotter than 500 0 C.
  • This method reduces the tar carryover and approaches the gas cleanliness of a traditional down draft gasifier for any subsequent step.
  • This embodiment is more suited to gas engines or other applications that are excessively tar sensitive.
  • step c) can be done with waste gas from a combustion process (eg gas engine exhaust) or even the waste gas from Step B which has a very high moisture content.
  • the fluidising gas is heated and its temperature is typically between 200°C and 600°C depending on oxygen content.
  • Bio chars and brown coal typically have a cross over temperature between 120 and 15O 0 C.
  • the present invention is able to be undertaken in a low cost installation that can be situated close to the source of a carbonaceous substance due to the economies of scale. This substantially reduces transportation costs increasing the viability of using various carbonaceous substances as biofuels.
  • the process of the present invention may be suitable for a wide range of biomasses and other irregular fuels of varying size and distribution as the process allows the use of fluidised beds for the drying and gasification process steps.
  • the process provides increased flexibility to separate non-desirable gases that can be produced during these steps when using various types of biomass feeds such as municipal waste, and agricultural wastes including manure.
  • the process of the present invention also provides increased flexibility to cater for the large changes in density associated with drying and de-volatilisation and also provides reduced sensitivity to contamination of feedstock eg dead chickens included in chicken manure from battery farm operations.
  • the process includes fewer problems associated with tar carry over due to the use of steam, oxygen as tempering gases (and CO 2 in the recycled gas) as well as the ability to have hotter feed material because of the preheating in the final stage of drying / partial gasification.
  • the process has the ability to take the tar laden, low temperature gasification off gas, and recycle pass this into the hottest gasifier or destroy these compounds in after-burners.
  • the process of the present invention provides significant economic advantages due in part to the low cost of construction as the process allows the use of fluidised beds with lower overall height compared to traditional fluidised beds and which are designed for low temperature and pressure operation. No necessity for super heated steam, although superheated steam can be use if the steam systems already exist.
  • the concept has modular scalability so, factory built, skid mounted dryer, gasifiers and heat exchanges can be delivered to site with minimum site erection.
  • the process of the present invention also has high efficiency due to recycling surface moisture off gas to the gasifier (after NH 4 and HS 2 removal if required) reducing the need to raise steam.
  • the process uses the waste heat in the exhaust gas from the gas engine or after burners to re-heat the steam to be used in the inherent moisture dryer.
  • Other efficiency advantages are: the use of the waste heat in the syngas from the char gasifyier to re-heat the water used in the inherent moisture dryer; using the waste gas post the steam raising in the surface moisture dryer; using the syngas from the CO 2 Removal dryer / gasifier as the fluidising gas of the second step gasifier; and using the sensible heat in the exhaust gas from the gas engine to pre-heat the exhaust that is the fluidising gas of the biomass gasifier.
  • the process of the present invention is very easy to scale into very small units due to no dependence on gas or steam turbines, the modular nature of design, the relative low height of the installation due to the use of fluidised beds, and the split nature of process steps.
  • Each of these characteristics provides that the present invention can be used for a simple rural based design for hot or dry climates as well as various other applications as in particular there is no necessity for a water treatment plant or cooling towers.
  • the process according to the present invention has many environmental advantages as it allows wet biomass to turned in to electricity more efficiently. This means that a smaller amount of biomass is needed before there is sufficient biomass to build a small power station. Therefore, more biomass power stations can be economically built. Approximately lMW e hour of biomass energy will save the environment 1000 kg of CO 2 emission.
  • the process of the present invention allows the ability to have more distributed biomass power generation at distance from the major coal burning power stations which thereby reduce line loses. For example 115 kW is needed to supply 100 kW of power at a distance of 300km from the power station.
  • According to one embodiment of the present invention allows wet coal to be turned into electricity more efficiently. Therefore, less coal is burned to produce the same amount of electricity. For brown coal this approximately 400 kg of CO 2 emission, is reduced per lMW e generated.
  • the process of the present invention is not highly water dependent as it is not reliant on external water for cooling towers and to make for steam losses. This is achieved in three ways:
  • a 10 MW e biomass power station would save 92000 t of CO 2 emission per year as well as create rural jobs and not use any external water.
  • Syngas produced by the process of the present invention could be used in the smaller plants for power generation, with a gas engine where the engine is also the hot gas generator. Syngas could also be used for combined cycle power generation on larger plants. Syngas has also been used for manufacturing transport fuel using the Fisher Trope process to typically make ethanol or diesel.
  • Biomass is not a homogenous substance. Reference is made to Figure 1. The operating condition to achieve best gasification performance has to be varied for each type of biomass.
  • the release of gaseous compounds during biomass waste pyrolysis consisted of four main stages. During the first stage, strongly bonded hydrated compounds are released to form a condensable water fraction ... The second stage involves evolution of CO and CO 2 compounds with the peak evolution rate detected at around 37O 0 C. Thirdly, hydrocarbons are released at higher temperatures as products of secondary cracking of the tar fraction, with methane being the predominant compound. The fourth stage is the release of hydrogen at temperatures above 600 0 C.” (V Strezov, L Strezov and J Herbertson, 2005)
  • the fluidising gas composition has a strong impact on the rate of gasification, as shown in Figure 2, as does the degree of carbonisation.
  • the rate of gasification of char is similar to wood at one fifth the oxygen content in the fluidising gas. That is, wood gasification rate at 4% oxygen is similar to wood char gasification rate at 21% oxygen.
  • Splitting the dryer / gasifier into a number of steps allows complete control over the various reaction rates. It also caters for the very different density and size of particles at the various stages between feed and final char burn out. This makes selective use of oxygen enrichment move attractive. This is not possible with the HRL design.
  • the splitting of the dryer also makes the workable but un-economic Steam Fluidised Bed Drying economically attractive due to increased heat transfer rates and it makes such a system scalable down to biomass size.
  • the heat transfer rate can be improved as the biomass entering the dryer is cooler compared to the steam.
  • the biomass can be made to move in plug flow relative to the steam pipe, compared to mixed tank flow, then the heat transfer rate can again be improved.
  • Splitting the dryer, so that the steam tubes only contacts the fresh biomass ensures the highest rate of heat transfer for the lowest possible steam pressure. In this way steam at a pressure as low as 60 to 8OkPa (gauge) can be put to work heating biomass at 25 to 100 0 C.
  • incline side blown fluidised bed International Patent Application No. PCT/AU2007/0007108
  • the biomass approaches "plug flow” rather than the traditional "mixed tank flow” found on most fluidised bed systems. This plug flow also helps making the low pressure steam useful.
  • carbon conversion One of the commonly used criteria for gasification is carbon conversion. This is defined as:
  • Carbon conversion 1- (carbon in char) ⁇ (carbon in solid feed stock)
  • process designers have selected higher temperatures and pressures. As a result, the capital costs of their plants have increased.
  • the ash from the process and activated carbon mixed with this ash make an excellent fertiliser and soil conditioner. Therefore, for biomass applications, it is not that important to have a very high carbon conversion.
  • the higher temperature portion of the process are very much smaller if it is staged.
  • the process of the present invention may be modified for peat, low rank coal and tar sands if the feed stock was sufficiently reactive. Test work with Georgia lignite has shown that this coal is reactive enough to gasify at low temperature and pressure.
  • Example 1 is for a plant to produce a hot bio-char as a feed to a conventional coal based power station.
  • Figure 3 there is shown a process flow diagram in accordance with one embodiment of the present invention. As can be seen, the carbonaceous material proceeds through three process steps which ultimately results in the production of low grade syn-gas.
  • the carbonaceous substance enters a surface moisture dryer where the carbonaceous substance is contacted with a hot gas at a temperature of between 115 °C and 400 °C.
  • the hot gas is a waste gas from the power station.
  • the surface moisture dryer also indirectly contacts the carbonaceous substance with steam flowing through steam tubes within the dryer. The action of the steam indirectly contacting the carbonaceous substance slowly heats the substance to between 100°C and 14O 0 C resulting in the steam condensing and being removed from the surface moisture dryer as liquid water.
  • the steam entering the surface moisture dryer at step a) has a temperature of between 105°C to l75°C.
  • the result of the first process step a) involving the surface moisture dryer provides an exit stream of carbonaceous substance with reduced surface moisture content and at a temperature of between 100 0 C and 140 0 C.
  • the hot gas exiting the surface moisture dryer at step a) includes the moisture removed as steam from the carbonaceous substance together with fine particles carried through with the gas stream. A portion of this warm gas may be reheated by a hot gas generator and then used as the feed gas for the gasification step c).
  • This first process step a) could be carried out using a variety of devices such as a steam heated rotary kiln or hearth but is more preferentially carried out using a horizontal, differentially fluidised bed surface moisture dryer.
  • a rotary lock device such as a screw conveyor or rotary valve separates the surface moisture drier at process step a) and provides the heated up carbonaceous material to the second process step b) which in this embodiment takes the form of an inherent moisture drier.
  • the carbonaceous substance is contacted with low-pressure superheated steam.
  • the steam temperature is typically between 400 0 C and 850 0 C 5 and as a result this process provides a carbonaceous substance with substantially reduced inherent moisture.
  • the temperature of the carbonaceous substance is raised during this process step to between 120 0 C to 220 0 C.
  • the second process step b) could be executed in a variety of devices such as a conventional rotary kiln or tray drier but is more preferentially done in a horizontal, differentially fluidised bed.
  • the resultant gas stream of steam from the inherent moisture drier of process step b) is recompressed. Some of this recompressed steam is recycled into the steam superheater that feeds the inherent moisture drier and the balance is fed into the first process step a) steam tubes of the surface moisture dryer.
  • the feed carbonaceous substance has a very high moisture content the steam balance is in slight deficit, and feed substances with lower moisture content the steam balance is slightly positive.
  • the process heat for the steam superheater and the hot gas entering the surface moisture dryer at step a) is provided by a stand-alone hot gas generator (HGG).
  • This HGG preferentially burns wet carbonaceous material so that the waste gas has a high water content.
  • this wet carbonaceous material is the fine carbonaceous material blown out of the surface moisture drier.
  • the heat exchanger depicted in figure 3 cools the hot gas entering step a) to between 115°C to 400 0 C and separately heats the super heated steam for entry into step b) and the hot gas for use in step c) up to 400°C to 85O 0 C.
  • a rotary lock device such as a screw conveyor or rotary value transfers the carbonaceous substance now with very little surface moisture or inherent moisture from the inherent moisture drier to the gasifier at process step c).
  • the gasification of the carbonaceous material is provided by contacting the carbonaceous material with a stream of hot gas.
  • the hot gas is at a temperature of between 700 0 C to 750 0 C.
  • the hot gas is chosen from one of, or a mixture of, oxygen, steam and/or air. More preferably to get maximum efficiency the gas steam is a mixture of oxygen and heated off gas that exists from the surface moisture drier at process step a).
  • the bio-char is used like a high rank coal within the power station.
  • This third step could be executed in a variety of devices such as a conventional rotary kiln or tray drier but is more preferentially done in a horizontal, differentially fluidised bed.
  • Example 2 In the following example, fresh leaves and branches hav.e been mechanically pick up from the ground. The average collection rate is 1.25 tonne per hour over the entire year. This biomass material will be brought to the small central plant where the timber is chipped. The power plant is within 25 km of the farm based sustainable timber production.
  • the fuel composition is:
  • the wood waste proceeds through three process steps a), b) and c) which ultimately results in the production of syngas at step d).
  • the hot char which exits the partial gasification step c) is processed in a conventional gasifier at step d) and the sensible heat from that gasifier is used to heat steam which is then used in the removal of surface moisture and inherent moisture at steps a) and b).
  • the syngas is used to drive a gas engine or gas turbine at step e) and the exhaust gases can then be used for direct contacting the biomass in steps a) or b) or for providing waste heat to indirectly heat hot gas.
  • the wood waste enters a surface moisture dryer in the form of a fluidised bed reactor with indirect steam heating, which is 3 m long, 0.5 m wide and has a steam tube area of 15m 2 .
  • this surface moisture dryer the wet wood waste is contacted with 500 kg/h of hot air at a temperature of 200 °C which partially fluidises the wet wood waste within the reactor.
  • This hot air comes from a heat exchanger used to cool the waste gas from the gas engine/gas turbine at step e).
  • the surface moisture dryer also indirectly contacts the wood waste with saturated steam flowing through steam tubes within the dryer.
  • the steam is at 15O 0 C.
  • the action of the steam indirectly contacting the carbonaceous substance slowly heats the wood waste to 95°C, resulting in the 380 kg/h of steam condensing and being removed from the surface moisture dryer as liquid water.
  • the surface moisture dryer does approximately 15OkW of drying work. About 72% of the heating and drying work is done by the condensing steam. The wood waste leaves this dryer at approximately 39% moisture.
  • step a) and step b) are undertaken the same vessel which totals 6 m in length but the duct work of the fluidised bed delivers hotter and lower oxygen gas to the inherent moisture portion of the vessel compared to the surface moisture portion.
  • the wood waste is contacted with 500 kg/h of waste gas at 25O 0 C.
  • the wood waste's temperature increases from 95 0 C to 135 0 C and its moisture drops from 39% to 16%.
  • the inherent moisture portion of the vessel is 3 m long and 0.5m wide.
  • the steam temperature is 150 °C and steam tube area is 15m 2 .
  • step a) and step b) The resultant exhaust from step a) and step b) is de-dusted and then sent to a bag house after which the gas can be sent to a clean water recovery unit to remove the moisture taken from the wood waste.
  • a screw conveyor transfers the wood waste at 135 0 C and 16% moisture from step b) to the gasifier at process step C.
  • the gasification of the wood waste is provided by contacting the wood waste with the high humidity waste gas from the surface moisture dryer which has been enriched with oxygen from a PSA oxygen plant.
  • the waste gas has been enriched to 5.0% oxygen by volume and heated to 400 0 C in a heat exchanger cooling the waste gas product syngas.
  • the wood is rapidly dried and partially gasified at step c) and some tars and oils are also produced as well as CO 2 and CO.
  • the wood char leaves the biomass gasifier at step c) at about 45O 0 C and enters the char gasifier step d) via a screw conveyor.
  • the off gas from Step c) is partially oxidised to convert the sulphur compounds into sulphates which are trapped in the matrix of hot dolomite in a sulphur scrubber prior to entering step d). With the removal of sulphur compounds the gas can be past over methantion catalyst to lower the H 2 and CO content and raise the CH 4 content. This reduces potential knocking at the gas engine at step e). This gas, which is now at about 700 0 C, enters step d).
  • the hot fluidising gas in step d) has high humidity which helps ensure good tar and oil conversion to gas.
  • Step d) is typically held at 800 to 900 0 C with the staged addition of oxygen. Liquid water is added to the char ash exiting step d) and the steam from this cooling step rises into the gasifier increasing the humidity.
  • the syngas produced by step d) is cooled through two heat exchangers running in parallel.
  • the syngas is cooled further in a heat collection heat exchanger for the absorption chiller.
  • the chiller is used to cool the water in the liquid ring compressor which scrubs the gas and removes particulates and raises it pressure to 100 KPa(g) .
  • Approximately 950 m 3 /h of 8.5 MJ/m 3 syngas is produced which translates to approximately 1.0 MWe of power (gross) at Step d) or approximately 0.75 MWe (net).
  • the overall conversion efficiency, thermal to electrical, is 26%, even at this micro scale. This is similar to open cycle at the plus 15MW e scale.
  • Fluidising Gas Pre Heater cools the engine exhaust and heats the waste gas from the surface moisture dryer.
  • Exhaust Cooler cools the gas engine exhaust and heats the steam for the inherent moisture drier.
  • FIG. 6 illustrates how to apply the concept to Municipal Solid Waste (MSW), where the undesirable metals, halogens and other gases are evolved between 14O 0 C and 25O 0 C.
  • MSW Municipal Solid Waste
  • the scrubbing systems are between steps b) and c) in this example. If there was significant manure load then one would add a scrubber between steps a) and b) that is between 5O 0 C and 100 0 C.

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Abstract

L'invention concerne un procédé pour produire du syngaz à partir d'une substance carbonée et/ou traiter une substance carbonée. Le procédé comporte les étapes suivantes : a) réduire l'humidité de surface de la substance carbonée; b) réduire l'humidité propre de la substance carbonée; et c) gazéifier la substance carbonée pour produire du syngaz. A l'étape a), la substance carbonée est directement mise en contact avec un gaz chaud à une température variant entre 50 °C et 250 °C et/ou la substance carbonée est indirectement mise en contact avec de la vapeur d'eau saturée à une température variant entre 105 °C et 250 °C.
PCT/AU2008/000206 2007-02-16 2008-02-15 Procédé de séchage et de gazéification WO2008098311A1 (fr)

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US12/527,156 US20100115841A1 (en) 2007-02-16 2008-02-15 Drying and gasification process
EP08706089A EP2121874A4 (fr) 2007-02-16 2008-02-15 Procédé de séchage et de gazéification
AU2008215182A AU2008215182B2 (en) 2007-02-16 2008-02-15 Drying and gasification process
CA002678400A CA2678400A1 (fr) 2007-02-16 2008-02-15 Procede de sechage et de gazeification
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WO2011107266A3 (fr) * 2010-03-02 2012-12-27 Heinz Spliethoff Procédé de gazéification allothermique de combustibles de gazéification contenant des hydrocarbures
EP2652094A1 (fr) * 2010-11-25 2013-10-23 Creedmore Pty Ltd Combustible de co-combustion avec du charbon dans une centrale électrique au charbon à faibles émissions de co2
US8580152B2 (en) 2010-04-13 2013-11-12 Ineos Usa Llc Methods for gasification of carbonaceous materials
US8585789B2 (en) 2010-04-13 2013-11-19 Ineos Usa Llc Methods for gasification of carbonaceous materials
US8894885B2 (en) 2011-04-06 2014-11-25 Ineos Bio Sa Apparatus and methods for tar removal from syngas
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AU2008215182A1 (en) 2008-08-21
EP2121874A4 (fr) 2012-08-01
AU2008215182B2 (en) 2011-09-22
EP2121874A1 (fr) 2009-11-25
CA2678400A1 (fr) 2008-08-21
NZ579390A (en) 2012-03-30

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