Process for electric power production using a biogas

Claim 2

A process for the production of electric power with a biogas used as a fuel for an electric power producing combustion turbine which drives a generator, which turbine will accept such a biogas only at a temperature below a predetermined temperature, wherein a biomass is gasified to produce a hot stream of a biogas, said biogas being at temperatures of between about 650°-875° C. and containing vaporized tar components and solid particulate matter, characterized in that: said hot stream of biogas, consisting essentially of a biogas, vaporized tars and solid particulate matter, has water injected thereto to partially cool the biogas to a temperature below said predetermined temperature by vaporization of said water, but above a temperature at which said vaporized tars in said biogas would condense out of said stream; filtering said partially cooled biogas to remove said particulate matter; and directly charging said partially cooled, filtered biogas containing said vaporized water and vaporized tars to an electric power producing combustion turbine to produce electric power.

Claim 3

In a process for the production of electric power as defined in claim 1, the improvement wherein said hot stream of biogas is cooled by said water injected thereto to a temperature of between 260°-550° C.

Claim 4

In a process for the production of electric power as defined in claim 2, the improvement wherein said partially cooled biogas is filtered by passing the same through a filter unit containing ceramic filters.

Claim 5

In a process for the production of electric power as defined in claim 2, the improvement wherein said partially cooled biogas is filtered by passing the same through a filter unit containing porous metallic filters.

Claim 6

In a process for the production of electric power as defined in claim 2, the improvement wherein said partially cooled biogas is filtered by passing the same through a filter unit containing high temperature bag filters.

Claim 7

In a process for the production of electric power as defined in claim 2, the improvement wherein said hot stream of biogas is at a pressure of about 200-300 pounds per square inch at the time of injection thereto of said water.

Claim 8

A process for the production of electric power with a biogas used as a fuel for an electric power producing combustion turbine which drives a generator, which turbine will accept such a biogas only at a temperature below a predetermined temperature, wherein a biomass is gasified to produce a hot stream of a biogas, said biogas being at temperatures of between about 650°-875° C. and containing tar components and solid particulate matter, characterized in that: said hot stream of biogas has water injected thereto to partially cool the biogas to a temperature below said predetermined temperature by vaporization of said water, but above a temperature at which tars in said biogas would condense out of said stream; filtering said partially cooled biogas to remove said particulate matter; injecting into at least a portion of said partially cooled, filtered biogas a supplementary spray of water to further partially cool said portion of said partially cooled, filtered biogas; and directly charging said partially cooled, filtered biogas to an electric power producing combustion turbine to produce electric power.

Claim 9

A process for the production of electric power with a biogas used as a fuel for an electric power producing combustion turbine which drives a generator, which turbine will accept such a biogas only at a temperature below a predetermined temperature, wherein a biomass is gasified to produce a hot stream of a biogas, said biogas being at temperatures of between about 650°-875° C. and containing tar components and solid particulate matter, characterized in that: said hot stream of biogas has water injected thereto to partially cool the biogas to a temperature below said predetermined temperature by vaporization of said water, but above a temperature at which tars in said biogas would condense out of said stream; filtering said partially cooled biogas to remove said particulate matter; injecting into at least a portion of said partially cooled, filtered biogas a supplementary spray of water to further partially cool said portion of said partially cooled, filtered biogas; and directly charging said partially cooled, filtered biogas to an electric power producing combustion turbine to produce electric power.