Biomass Char Compositions for Catalytic Gasification

a technology of biomass char and composition, which is applied in the direction of waste based fuel, combustible gas production, chemical production, etc., can solve the problems of adding additional process costs, and achieve the effect of efficient carbon utilization

Inactive Publication Date: 2009-09-03
SURE CHAMPION INVESTMENT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]The present disclosure relates to particulate compositions comprising a biomass char, a biomass and/or a non-biomass, and a gasification catalyst. Further, the disclosure relates to processes for preparation of the particulate compositions and for gasification of the same in the presence of steam to form gaseous products, an

Problems solved by technology

It has generally been contemplated to provide such a catalyst from a source external to the gasification process, for example, by providin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0096]Feedstock Preparation

[0097]Switchgrass can be dried and crushed to produce a particulate having an average size of about 250 microns. The biomass feedstock can be provided to a combustion reactor fed by an enriched oxygen source. The resulting exhaust gas from the combustion reactor would contain hot CO2. The exhaust gas can be passed through a heat exchanger in contact with a water source to produce steam, a portion of which can be provided to a steam turbine to generate electricity. The biomass char produced from the biomass combustion reactor can be withdrawn and directed to a feedstock preparation operation where the biomass char can be crushed to a particle size ranging from about 0.85 to about 1.4 mm. Fines (<0.85 mm) can be separated from the crushed biomass char by vibratory screening.

[0098]Separately, as-received coal (Powder River Basin) can be stage-crushed to maximize the amount of material having particle sizes ranging from about 0.85 to about 1.4 mm. Fines (<0.85...

example 2

[0100]Catalytic Gasification

[0101]A portion of the generated steam from the heat exchanger of Example 1 can be superheated and then introduced to a fluidized bed gasification reactor (catalytic gasifier) supplied with the blended feedstock of Example 1. The blended feedstock can be introduced under a positive pressure of nitrogen. Typical conditions for the catalytic gasifier could be: total pressure, 500 psi and temperature, 1200° F. The effluent of the catalytic gasifier could contain methane, CO2, H2, CO, water, H2S, ammonia, and nitrogen, which can be passed to a scrubber to remove ammonia and an acid gas removal unit to remove H2S and CO2. The CO2 can be recovered.

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PUM

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Abstract

Particulate compositions are described comprising an intimate mixture of a biomass char producedfrom the combustion of a biomass, such as switchgrass or hybrid poplar, with at least a second carbonaceous material, such as petroleum coke or coal, and, optionally a gasification catalyst, for gasification in the presence of steam to yield a plurality of gases including methane and at least one or more of hydrogen, carbon monoxide, and other higher hydrocarbons are formed. Processes are also provided for the preparation of the particulate compositions and converting the particulate composition into a plurality of gaseous products.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority under 35 U.S.C. §119 from U.S. Provisional Application Ser. No. 61 / 032,734 (filed Feb. 29, 2008), the disclosure of which is incorporated by reference herein for all purposes as if fully set forth.FIELD OF THE INVENTION[0002]The present disclosure relates to particulate compositions comprising biomass gasification or combustion char and at least a second carbonaceous component as well as at least one gasification catalyst, where the char provides at least a portion of a gasification catalyst in the composition. Further, the disclosure relates to processes for preparation of the particulate compositions and for gasification of the same in the presence of steam to form gaseous products, and in particular, methane.BACKGROUND OF THE INVENTION[0003]In view of numerous factors such as higher energy prices and environmental concerns, the production of value-added gaseous products from lower-fuel-value carbonaceou...

Claims

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Application Information

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IPC IPC(8): C10L5/40C01B32/40C01B32/50
CPCC10J3/482C10J3/54C10J2300/0903C10J2300/0916C10J2300/0943Y02E50/30C10L1/326C10L5/04C10L5/44Y02E50/10C10J2300/0986Y02P20/145Y02P20/52
Inventor RAMAN, PATTABHI K.HIPPO, EDWIN J.
Owner SURE CHAMPION INVESTMENT LTD
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