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High-Efficiency Gasification/Oxy-Combustion Process with High Purity Hydrogen Production and Carbon Capture

IP.com Disclosure Number: IPCOM000033086D
Publication Date: 2004-Nov-24
Document File: 4 page(s) / 16K

Publishing Venue

The IP.com Prior Art Database

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High-Efficiency Gasification/Oxy-combustion Process with High Purity Hydrogen Production and Carbon Capture

Summary:

This invention proposes a novel process to produce high purity hydrogen from biomass using oxygen blown gasification and oxy-combustion.  The process uses membrane technology to separate hydrogen from other gases.  A very high purity hydrogen stream is obtained by further purification.  The high purity hydrogen may be used in fuel cells or other applications.  Energy from biomass is fully recovered and utilized to produce combined heat and power.  The CO2 produced in the process is ready for capture thus producing near zero emissions.

Introduction:

The present invention relates to a process to produce high purity hydrogen gas from biomass and fossil fuels, producing combined heat and power with near zero emissions.

Invention Summary:

The purpose of this invention is to promote an efficient process to produce high purity hydrogen from biomass and solid fossil fuels, while generating combined heat and power. The proposed process produces a highly concentrated CO2 stream that is ready to be captured.  Thus, the process will result is near zero emissions of CO2, which is a greenhouse gas.  The process uses novel membrane technology to separate hydrogen from other gaseous species.

Invention Description:

The characteristics and advantages of the present invention will be apparent to those skilled in the art from the detailed description of the preferred embodiments, which are discussed below with reference to the attached drawing.

A mixture of biomass and solid fossil fuel is partially gasified in an oxygen-blown gasifier, as shown in Fig. 1.  A wide variety of biomass may be used.  Examples of biomass include, but are not limited to, agricultural (bagasse, straw, kenaf, wood, tree bark, saw dust, etc.), bio-refinery (corn, corn-stalk, etc.), bio-solids, and animal waste.  The mixture should contain at least a certain amount of biomass even though the ratio of biomass in the mixture may vary from 0% to 100%.  Thus with 0% biomass the fuel is totally solid fossil and with 100% biomass there is no solid fossil fuel.  The gasification is performed with pure oxygen and steam.  The oxygen is produced on-site with an Air Separation Unit (ASU).

The gaseous stream from the gasifier is passed through a cyclone (or a filter) to remove any solids.  The clean gas is then used to produce steam, which cools down the gas.  The gas contains C...