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Research Papers: Fuel Combustion

A Measurement Device for Online Monitoring of Total Tar in Gasification Systems

[+] Author and Article Information
A. Gredinger

Institute of Combustion and
Power Plant Technology—IFK,
University of Stuttgart,
Pfaffenwaldring 23,
Stuttgart 70569, Germany
e-mail: andreas.gredinger@ifk.uni-stuttgart.de

D. Schweitzer, H. Dieter, G. Scheffknecht

Institute of Combustion and
Power Plant Technology—IFK,
University of Stuttgart,
Pfaffenwaldring 23,
Stuttgart 70569, Germany

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received July 21, 2015; final manuscript received January 13, 2016; published online March 1, 2016. Assoc. Editor: Yiannis Levendis.

J. Energy Resour. Technol 138(4), 042205 (Mar 01, 2016) (7 pages) Paper No: JERT-15-1269; doi: 10.1115/1.4032730 History: Received July 21, 2015; Revised January 13, 2016

Tars produced during the thermal conversion of coal or especially biomass is one of the major obstacles for the application of gasification systems. They limit the use of the producer gas in engines or turbines or, in further processes like in methanization or conversion to other secondary fuels or chemicals, without further gas cleaning. The determination of the tar content with conventional methods is very time consuming and does not allow continuous online monitoring of the gas quality. One approach to avoid these drawbacks is an automatic system developed at the University of Stuttgart that monitors the tar concentration in the producer gas online and semicontinuous during the gasification process. The technique is based on a flame ionization detector (FID) difference measurement of the hydrocarbons in the producer gas, where the condensable hydrocarbons—the tars—are condensed on a suitable filter material. This work shows the further development of the measurement technique, the choice of a suitable tar filter material for the underlying difference measurement, and a first verification of the system with real producer gas at a 20 kWth bench scale gasifier.

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Figures

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Fig. 1

Basic principle of the FID tar measurement system: sampling phase (left) and analyzing phase (right)

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Fig. 2

FID-signal during sample and analysis cycle

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Fig. 3

The current version of the online tar measurement device prototype

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Fig. 4

Calibration gas response factors using different calibration gas concentrations

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Fig. 5

Installation layout of IFK test gas generator

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Fig. 6

FID-signal during sample and analysis cycle at ideal adsorption properties

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Fig. 7

Experimental results of toluene breakthrough while using different tar filter materials

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Fig. 8

Experimental results of tar species breakthrough while using different tar filter materials

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Fig. 9

Results of first field test with real producer gas from gasification

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