摘要:
The present invention discloses a process for the synthetic generation of methane from a feed gas mixture comprising carbon monoxide, hydrogen and water vapour and optionally aromatic hydrocarbons; said process comprising the steps of: a) bringing the feed gas mixture in contact with a fluidized bed catalyst having catalyst particles which comprise as catalytic active component a metal and/or a metal compound or a mixture thereof under the circumstances of: b) an elevated temperature in the range of 250 to 500°C; c) a feed gas pressure in the range of 0.8 to 70 bar; d) a gas hourly space velocity of 1000 to 50000 h-1; and e) a concentration of H2/CO in the initial gas mixture in the range of 0.25 to 5. The afore-mentioned process allows to catalytically convert hydrogen and carbon monoxide effectively in a fluidized bed catalytic reactor which avoids a rapid deactivation of the catalyst material and therefore delivers a high activity of the catalytic active components in the process. Both thermochemical reactions, the endothermic reformation of higher hydrocarbons, i.e. aromatic hydrocarbons, and the exothermic methane generation, proceed simultaneously within the fluidized be catalytic reactor, leading to an overall enhanced thermal efficiency of the conversion process.
摘要:
The present invention discloses a method for catalytic production of a methane-rich gas mixture from sulfur-containing synthesis gas with simultaneous at least partial sulfur removal, thereby: a) producing a synthesis gas mixture; b) bringing said synthesis gas mixture into a contact with a methanation catalyst thereby continuously deactivating the methanation catalyst by sulfur and/or carbon species comprised in the synthesis gas mixture in one part of the methanation process, while a part of said depleted methanation catalyst is simultaneously regenerated by oxidation in a different part of the process; c) the methanation catalyst is a metal, a metal oxide, a metal sulfide or a mixture of metals, metal oxides or metal sulfide/nitride/phosphide on a support; d) said metal or metals are selected from a group comprising Ni, Ru, Mo, Co, Fe, Rh, Pd, Pt, Ir, Os, W, V, wherein the support is an oxide of a group comprising Al 2 O 3 , SiO 2 , TiO 2 , CeO 2 , ZrO 2 , carbides, nitrides, phosphides or a mixture thereof, wherein e) the metal or metals can be promoted by one or more of the following elements: K, P, Na, Ba, Ni, Ru, Rh, Co, Pt, Pd, Ir, W, Os, V, Mn. The method achieves a nearly complete methanation of CO in the presence of both organic and inorganic sulfur compounds, such as olefins, tars etc., combined with an at least partial uptake of sulfur followed by a relatively fast oxidative regeneration of the methanation catalyst (bed material) and sulfur release, preferably at a temperature level near the methanation temperature.
摘要:
The present invention discloses a method for converting a raw gas into a methane-rich and/or hydrogen-rich gas, comprising the steps of : a) providing the raw gas stemming from a coal and/or biomass gasification process, thereby the raw gas comprising beside a methane and hydrogen content carbon-monoxide, carbon-dioxide, alkanes, alkenes, alkynes, tar, especially benzole and naphthalene, COS, hydrogen sulfide and organic sulfur compounds, especially thiophenes; thereby the ratio of hydrogen to carbon monoxide ranges form 0.3 to 4; b) bringing this raw gas into contact with a catalyst arranged as a fluidized bed reactor at temperatures above 200°C and at pressures equal or larger than 1 bar in order to convert the raw gas into a first product gas, thereby simultaneously convert organic sulfur components into hydrogen sulfide, reform tars, generate water/gas shift reaction and generate methane from the hydrogen/carbonmonoxide content; c) bringing the first product gas into a sulfur absorption process to generate a second product gas, thereby reducing the content of hydrogen sulfur and COS from 100 to 1000 ppm down to 1000 ppb or less; d) optionally bringing the second product gas into a carbon dioxide removal process to generate a third product gas at least almost free of carbon dioxide; e) bringing the third product gas into a 2nd methanation process to generate a forth product gas having a methane content above 5 vol%; f) ) optionally bringing the fourth product gas into a carbon dioxide removal process to generate a fifth product gas at least almost free of carbon dioxide g) bringing the fifth product gas into an hydrogen separation process in order to separate a hydrogen rich gas from a remaining methane-rich gas, called substitute natural gas.
摘要:
Method and plant for converting solid biomass into electricity by means of a gasifier/fuel cell combination comprising the following method steps and elements: A1 introduction of solid biomass into a gasifier; A2 introduction of a gasification medium (82) to the gasifier (1); B introduction of product gas from the gasifier to a particle separator/filter (2); C introduction of product gas with low particulate content from the particle separator / filter (2) into a reactor (2) for catalytic reaction, wherein the composition fo the product gas can be adjusted by means of positioning the catalyst monolith (205) within the filter elements (203), D introduction of product gas with low particulate content from the reformer into one or two sulphur absorbers (3, 4),- E introduction fo the product gas which has had sulphur removed in the sulphur absorber into a solid-oxide fuel cell (SOFC) (17) to generate electricity (92).
摘要:
The present invention discloses a process for the synthetic generation of methane from a feed gas mixture comprising carbon monoxide, hydrogen and water vapour and optionally aromatic hydrocarbons; said process comprising the steps of: a) bringing the feed gas mixture in contact with a fluidized bed catalyst having catalyst particles which comprise as catalytic active component a metal and/or a metal compound or a mixture thereof under the circumstances of: b) an elevated temperature in the range of 250 to 500°C; c) a feed gas pressure in the range of 0.8 to 70 bar; d) a gas hourly space velocity of 1000 to 50000 h-1; and e) a concentration of H2/CO in the initial gas mixture in the range of 0.25 to 5. The afore-mentioned process allows to catalytically convert hydrogen and carbon monoxide effectively in a fluidized bed catalytic reactor which avoids a rapid deactivation of the catalyst material and therefore delivers a high activity of the catalytic active components in the process. Both thermochemical reactions, the endothermic reformation of higher hydrocarbons, i.e. aromatic hydrocarbons, and the exothermic methane generation, proceed simultaneously within the fluidized be catalytic reactor, leading to an overall enhanced thermal efficiency of the conversion process.