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Solar-thermal fluid-wall reaction processing

a technology of solar energy and fluid wall, applied in the field of solar energy reactors, can solve the problems of preventing continuous operation, affecting the efficiency of production, so as to reduce or prevent the production of carbon black, short residence time, and cost-effective

Inactive Publication Date: 2006-06-29
UNIV OF COLORADO THE REGENTS OF +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This method enables continuous, cost-effective hydrogen production from hydrocarbon gases without environmental damage, maintaining the reactivity of fine carbon black particles and preventing reactor plugging.

Problems solved by technology

However, current methods for producing hydrogen incur a large environmental liability, because fossil fuels are burned to supply the energy to reform natural gas (primarily methane, CH4) to produce hydrogen (H2).
Furthermore, deposition on the reactor walls can cause plugging of the reactor and eventual shutdown of the process, thus, preventing continuous operation.
In addition, carbon deposition on an outer transparent wall of a solar reactor can lead to overheating of the reactor wall.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Operation of a Three-Shell Reactor

[0088] In accordance with the present invention, a concentric three-tube aerosol transport reactor was constructed and vertically interfaced to the HFSF at NREL. The aerosol transport reactor consisted of an outer 5.1 cm outside diameter×4 mm thick×24 cm long quartz “protection” tube, a central 2.4 cm outside diameter×4 mm thick×35.6 cm long graphite “heating” tube, and a 1.8 cm outside diameter×6 mm thick×44 cm long graphite “reaction” tube. The “reaction” tube consisted of a 30 cm long porous graphite section with 7 cm of solid graphite tube on both ends of the “reaction” tube. The porosity of the graphite tube was 49% with a permeability of air (at standard temperature and pressure (STP)) of 1 ft3 / ft2 / min. It was a sunny day. A secondary concentrator delivered 7.4 kW of solar-thermal power over a 9.4 cm length. The concentrator was positioned concentrically around the outer quartz “protection” tube. A 99% methane / 1% argon gas was fed at a rate o...

example 2

Operation of a Three-Shell Reactor with No “Fluid-Wall” Gas Flow

[0089] The process conditions of Example 1 were repeated except that no “fluid-wall” hydrogen gas was flowed through the porous “reaction” tube. Within 8 minutes, the process was shut down due to difficulties maintaining feed gas flow using mass flow controllers. After cooling, the reactor was dismantled and inspected. It was found that carbon was deposited inside of the “reaction” tube. The carbon was analyzed by x-ray diffraction and found to contain a large graphitic content. This comparative example illustrates that, without the fluid-wall, the reactor plugs and prevents continuous operation.

example 3

Reactor Operation with Increased Fluid-Wall and Purge Gas Flow Rates

[0090] The apparatus described in Example 1 was used except that the “fluid-wall” gas was changed to argon. It was fed at a rate of 4 slpm through the porous tube wall. In addition, the argon “purge” gas flow was increased to 10 slpm.

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Abstract

The present invention provides a method for carrying out high temperature thermal dissociation reactions requiring rapid-heating and short residence times using solar energy. In particular, the present invention provides a method for carrying out high temperature thermal reactions such as dissociation of hydrocarbon containing gases and hydrogen sulfide to produce hydrogen and dry reforming of hydrocarbon containing gases with carbon dioxide. In the methods of the invention where hydrocarbon containing gases are dissociated, fine carbon black particles are also produced. The present invention also provides solar-thermal reactors and solar-thermal reactor systems.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a divisional application of U.S. patent application Ser. No. 10 / 383,875, filed Mar. 7, 2003, which takes priority from U.S. provisional application Ser. No. 60 / 362,563, filed Mar. 7, 2002, and which is a continuation-in-part of application Ser. No. 10 / 239,706 filed Feb. 24, 2003, which is the national stage of PCT application number PCT / US01 / 15160 filed May 8, 2001, which claims the benefit of U.S. provisional application No. 60 / 203,186, filed May 8, 2000.ACKNOWLEGEMENT OF GOVERNMENT SUPPORT [0002] This invention was made, at least in part, with funding from the United States Department of Energy under grant numbers DE-FC36-99G010454 and DE-AC36-99G010337. The United States Government has certain rights in this invention.BACKGROUND OF THE INVENTION [0003] The present invention relates to solar-thermal reactors and processes for carrying out high temperature chemical reactions. More particularly, it relates to a rapid...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09C1/48B01J8/00B01J8/02B01J8/08B01J10/00B01J19/12C01B3/04C01B3/24C01B3/34C01B17/04F24S20/20F28C3/12
CPCC01B2203/04C01B2203/049C01B2203/0805C01B2203/0833C01B2203/085C01B2203/0866C09C1/48F24J2/07F28C3/12Y02E10/41Y02E60/364B01J8/0045B01J8/025B01J8/087B01J10/002B01J19/127B01J2208/00212B01J2208/0038B01J2208/00451B01J2208/00513B01J2208/00522B01J2208/00752B01J2219/00006B01J2219/0272B01J2219/0883C01B3/04C01B3/24C01B3/34C01B3/344C01B17/0495C01B2203/0216C01B2203/0222C01B2203/0272F24S20/20Y02E10/40Y02E60/36Y02P20/133C01P2006/80
Inventor WEIMER, ALAN W.DAHL, JAIMEE K.LEWANDOWSKI, ALLAN A.BINGHAM, CARLBUECHLER, KAREN J. RASKAGROTHE, WILLY
Owner UNIV OF COLORADO THE REGENTS OF
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