Method for producing a homogeneous biomass fuel for gasification applications

Inactive Publication Date: 2007-09-27
ZEROPOINT CLEAN TECH
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Benefits of technology

[0009] The preparation method allows biomass from a wide range and sources and with a wide range of gasification characteristics to be utilized within a gasifier without modification of the gasifier unit, while maintaining the gasifier throughput rate and thermal profile. The method produces a fuel pellet with controllable size, density and moisture content. The method smoothes any changes in calorific value which may exist between different feedstocks. It has been found that the gasi

Problems solved by technology

In reality this is not easily achieved, although with good thermal management it is possible to operate with energy efficiencies in excess of 90%.
These different gasification behaviors, coupled with different physical structures, have caused difficulties for gasifier designers in that design modifications are required for almost every type of

Method used

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Embodiment Construction

[0010] Biomass comes in many forms, including woody biomass such as forest products and the wastes derived from wood including saw dust and paper and cardboard products. Non-woody forms of biomass include animal wastes, decomposable municipal waste, food production waste and energy crops. In both cases the biomass is an organic matter of recent origin. The physical form and typical associated moisture contents of the biomasses described above are vastly different, however, on dry ash free basis the chemical composition and calorific value of the fuels above are similar. Traditionally, using a wide range of range of fuels in gasification device has proved difficult, even though chemically speaking the biomasses are similar; this is attributed to differences in the gasification behavior of different biomass materials. Thermogravimetric studies have found rates of biomass gasification vary over an order of magnitude depending upon the source and type of biomass. One possible explanatio...

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Abstract

A method for producing a gasifier feedstock with uniform gasification characteristics from a number of biomass sources which each exhibit differences in their drying, pyrolysis, devolatization or gasification characteristics. The method allows biomass from a wide range and sources and with a wide range of gasification characteristics to be utilized within a gasifier without modification of the gasifier unit. The method produces a fuel pellet with controllable size, density and moisture content. The method smoothes any changes in calorific value which may exist between different feedstocks. It has been found that the gasification characteristics of a pellet formed in this way is strongly dependant upon the shape, moisture content and density of the pellet formed and less sensitive to the origin of the biomass feedstock.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This application claims benefit of co-pending U.S. Provisional Patent Application No. 60 / 785,933, filed Mar. 24, 2006, entitled METHOD TO PRODUCE A HOMOGENEOUS BIOMASS FUEL FOR GASIFICATION APPLICATIONS, and commonly assigned to the assignee of the present application, the disclosure of which is incorporated by reference in its entirety herein.FIELD OF THE INVENTION [0002] The present invention relates to the production of a homogenous gasifier fuel feedstock with uniform gasification characteristics from a number of biomass sources which each source exhibits differences in their drying, pyrolysis, devolatization or gasification characteristics. BACKGROUND OF THE INVENTION [0003] Gasification processes convert carbon-containing solids or liquids into combustible gases that ideally contain all the energy originally present in the feed. In reality this is not easily achieved, although with good thermal management it is possible to operate ...

Claims

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Application Information

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IPC IPC(8): C10L5/00
CPCC10J3/00C10J2300/0903C10J2300/0916C10L5/363Y02E50/30C10L5/44C10L5/46C10L5/48Y02E50/10C10L5/42
Inventor LEVESON, PHILIP D.GAUS, JOHN PAUL
Owner ZEROPOINT CLEAN TECH
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