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Entrained-flow gasification of biomass as slurry

a gasification method and biomass technology, applied in the direction of gasifier mechanical details, combustible gas production, waste based fuel, etc., can solve the problems of uneconomic method and unfavorable transmission method, and achieve the effect of reducing energy expenditur

Inactive Publication Date: 2011-02-24
SIEMENS AG
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AI Technical Summary

Benefits of technology

[0007]According to the inventive method, biomass is first torrefied (torrefaction process), subsequently ground into small particles with relatively little energy expenditure, then mixed with a liquid and pumped into the entrained-flow gasifier. In particular in the case of methods for generating synthetic fuels there is a case for using a part of the generated fuel or accumulating liquid residue materials such as e.g. paraffins. Other available liquid media such as water, oils, glycerin, methanol, liquid CO2, etc. are also possible, however. By means of the method according to the invention, which may be described by the term “torry slurry feed”, the entrained-flow gasification of pure biomass is rendered energetically favorable.

Problems solved by technology

Feeding in (solid) biomass such as wood, straw, miscanthus, etc. into an entrained-flow gasifier according to the dense phase conveying method is energetically unfavorable due to the high carrier gas flow rate and generally makes such a method uneconomic.

Method used

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  • Entrained-flow gasification of biomass as slurry

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Embodiment Construction

[0012]In a first stage 1, which may be described as “biomass torrefaction”, biomass 1.1, such as e.g. wood, straw or miscanthus, is torrefied in a torrefaction apparatus 1.2. The torrefied biomass is fed to a mill 1.3, where it is ground into particles that are suitable for the following slurry generation. The particles are supplied via a first inlet to a mixing apparatus 1.4 to which a liquid medium such as water, oils, heavy oil, bio-oil, glycerin, methanol, liquid CO2, paraffin, tar etc. is supplied via a second inlet. The biomass is mixed with the liquid medium in the mixing apparatus to produce a slurry.

[0013]The slurry is fed to a second stage 2, which may be described by the term “gasification”, where it is supplied by means of a slurry pump 2.1 to an entrained-flow gasification reactor 2.2 together with an oxidizing agent O2 containing free oxygen. A partial oxidation of the supplied slurry takes place in the entrained-flow gasification reactor in a flame reaction under high...

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Abstract

A method for entrained bed gasification of biomass is provided, wherein pure biomass is first torrefied then milled and the torrefied and milled biomass is introduced to the gasification process with a fluid as a slurry. An energetically favorable process is described using the combination of torrefaction, milling and mixing with a liquid, preferably residual products from a subsequent synthesis process, but also other available suitable materials.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is the US National Stage of International Application No. PCT / EP2008 / 062794, filed Sep. 24, 2008 and claims the benefit thereof. The International Application claims the benefits of German application No. 10 2007 050 895.8 DE filed Oct. 24, 2007. All of the applications are incorporated by reference herein in their entirety.FIELD OF INVENTION[0002]The subject matter of the application relates to a method for the entrained-flow gasification of biomass.BACKGROUND OF INVENTION[0003]Feeding in (solid) biomass such as wood, straw, miscanthus, etc. into an entrained-flow gasifier according to the dense phase conveying method is energetically unfavorable due to the high carrier gas flow rate and generally makes such a method uneconomic.[0004]To date there are no application cases in which biomass in solid form is gasified exclusively in the entrained-flow gasifier. Only admixing with coal is known in the prior art.SUMMARY OF INV...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10J3/72
CPCC10J3/485C10J3/506C10J2200/09C10J2200/152C10J2300/0903C10J2300/0916Y02E50/32C10J2300/0973C10J2300/0989C10J2300/16C10J2300/1807C10L9/083Y02E50/15C10J2300/0959Y02E50/10Y02E50/30
Inventor HANNEMANN, FRANKMETZ, THOMAS
Owner SIEMENS AG
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