Abstract:
A process (10) for co-producing power and hydrocarbons includes gasifying (16, 70) coal to produce a synthesis gas (36) and a combustion gas (86) both comprising at least CO 1 H 2 and CO 2 and being at elevated pressure, separating CO 2 (18, 48) from the synthesis gas, and synthesizing (20, 22) hydrocarbons from the synthesis gas. Power (1 14) is generated from the combustion gas, including by combusting (78) the combustion gas in the presence of oxygen and in the presence of at least a portion of the separated CO2 as moderating agent to produce a hot combusted gas (106) which includes CO 2 . The CO2 is recycled (1 12) or recovered from the combusted gas. In certain embodiments, the process (10) produces a CO 2 exhaust stream (134) for sequestration or capturing for further use.
Abstract:
A method for recovering resource from waste comprises: a first step for decomposing waste into ash and reformed gas by performing a partial- combustion, a thermal decomposition, and a reforming process with using only oxygen; a second step for pre-processing the ash obtained in the first step; a third step for recycling the ash pre-processed in the second step into resource by a melting process; a fourth step for recovering sensible heat of the reformed gas obtained in the first step, and separating sooty carbon from the reformed gas by a dust-collecting process thereby recycling the sooty carbon into active carbon in an another process; a fifth step for purifying the reformed gas having undergone a dust- collecting process in the fourth step into clean fuel gas by neutralization, desulfurization, and absorption processes, and recycling waste water produced as a byproduct; and a sixth step for utilizing the clean fuel gas obtained in the fifth step. Accordingly, the amount of pollutants contained in final disposal to atmosphere are minimized, and all of the waste is recycled into useful resource. Also, the operation cost (running cost) is reduced significantly.
Abstract:
The present invention provides a cost-effective biomass gasification method and system for converting biomass materials into gaseous fuel, wherein the system is capable of converting at least about 50-70% of the carbon in the biomass material into gaseous carbon at a temperature lower than about 1300° F. Also provided is a highly-efficient, cost-effective biomass gasification system comprises a combustor and a gasifier with an inside diameter of at least about 36 inches and a height of at least about 40 feet.
Abstract:
The invention relates to a method for converting energy while using biomass in an open circuit, during which a controllable quantity of biomass, while supplying an exhaust gas of an internal combustion engine (12) containing carbon dioxide and water vapor, is gasified and reduced to form a synthesis gas containing carbon monoxide and hydrogen. The synthesis gas is cooled while precipitating a condensate (37) and forming a residual gas. This residual gas is separated in a controllable manner into a first and a second portion. The first portion of the residual gas is subjected to a shift reaction and is subsequently led through a molecular sieve (44) while separating out hydrogen gas, and the hydrogen gas resulting therefrom is combined with the second portion of the residual gas for the synthesis of hydrocarbon compounds that are suitable for use as fuel, and a portion of gas not converted during the synthesis is fed either to the internal combustion engine (12) in the form of fuel or to another unit in the form of a heating medium. The invention also comprises a corresponding circulation system and an internal combustion engine.
Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zur Umwandlung von Energie unter Verwendung von Biomasse in einem offenen Kreislauf, bei dem eine steuerbare Menge Biomasse unter Zufuhr eines kohlendioxid- und wasserdampfhaltigen Abgases eines Verbrennungsmotors (12) zu einem kohlenmonoxid- und wasserstoffhaltigem Synthesegas vergast bzw. reduziert, das Synthesegas unter Abscheidung eines Kondensats (37) und Bildung eines Restgases abgekühlt, das Restgas steuerbar in einen ersten und einen zweiten Teil aufgeteilt, der erste Teil des Restgases einer Shift-Reaktion unterzogen und anschließend durch einen Molekularsieb (44) unter Abtrennung von Wasserstoffgas geleitet und das daraus resultierende Wasserstoffgas mit dem zweiten Teil des Restgases zur Synthese von als Treibstoff tauglichen Kohlenwasserstoffverbindungen zusammengeführt und ein in der Synthese nicht umgesetzter Gasanteil wahlweise dem Verbrennungsmotor (12) als Brennstoff oder einer anderen Einheit als Heizmittel zugeleitet wird. Ferner umfasst die vorliegende Erfindung ein entsprechendes Kreislaufsystem und einen Verbrennungsmotor.
Abstract:
The invention relates to a process and apparatus for the production of thermal and electric energy in a pulp mill, in particular a sulfate pulp mill, according to which process and waste liquor of the cellulose pulp cooking liquor is concentrated, and this concentrated liquor is burned in the recovery boiler in the presence of biogenic fuels, in which case the thermal energy is recovered from the flue gases from the combustion, and this thermal energy is, when so desired, converted to electric energy. According to the invention, the biogenic fuel used is wood bark or similar waste wood, which is dried to a moisture content below 30 %, whereafter it is gasified to fuel gas, which is fed into the recovery boiler. The process according to the invention makes the acquisition of a separate bark boiler in pulp mills completely unnecessary, which significantly lowers the investment costs. The process simplifies the apparatus, its operation and maintenance, and improves energy efficiency.
Abstract:
A staged gasification process and system for thermal gasification of special waste fractions and biomass, e.g. wood comprises a drier (1), in which the fuel is dried by contact with superheated steam. The dried fuel is fed into a pyrolysis unit (4) to which superheated steam is also supplied. The volatile tar containing components produced in the pyrolysis unit (4) is passed to an oxidation zone (5) in which an oxidation agent is added so as to cause a partial oxidation, whereby the content of tar is substantially reduced. The solid fuel components from the pyrolysis unit (4) may be fed into a gasification unit (6) to which hot gases from the oxidation zone (5) are supplied. In the gasification unit (6) the solid fuel components are gasified or converted to carbon. The gas produced in the gasification unit (6) may be burnt in a combustion unit (7), such as a combustion engine. Thus, a gasification process is obtained for gasification of biomass and waste with a high energy efficiency, low tar content of the gasification gas, with moderate risk of slagging for a wide spectrum of fuels, including fuels with a large content of moisture.
Abstract:
A process and apparatus for the treatment of refuse having a predominantly carbonaceous matrix in which the refuse is gasified to combustible gas by reaction with steam within an electric arc discharge in the substantial absence of oxygen and/or nitrogen; the refuse intended to be supplied for gasification has a metered quantity of water added thereto and before supply to the gasification stage is subject to compression to achieve a substantial removal of air and to bring the water contained in it to a superheated state, and then subjected to decompression to transform the superheated water contained in it to steam.
Abstract:
A system and method generates electricity and co-produces a hydrogen flow from coal. The electricity is generated by a turbine with a topping combustor and a solid oxide fuel cell ("SOFC") reacting syngas. The syngas is produced in a coal gasifier with a portion of the compressed air from the turbine, coal, and steam. Prior to the syngas being delivered to the topping combustor and the SOFC, it is cleaned and a portion of the hydrogen in the syngas is removed to form the hydrogen flow. Additionally, a vitiated air flow from the SOFC is directed to the topping combustor and another portion of the compressed air from the turbine directed to the SOFC after it is heated with the turbine exhaust. An aspect of the invention varies the amount of electricity generated and the volume of hydrogen co-produced based upon the demand of electricity and/or the demand of said hydrogen.