Details

Title:

Experimental and Mechanism Study on NO Reduction by Phenol as a Typical Tar Produced in Updraft Biomass Gasification

Author(s):

Yin, R.H., Zhang, R.Z., Liu, C.Y., Luo, Y.H.

Document(s):

Abstract:

Gasification is one of the most promising ways for the utilization of the abundant biomass resource in China. However, corrosion and blockage caused by tar produced in the process seriously inhibit the development of the technology. Fortunately, tar has been found to have a positive effect on NO reduction in the previous work. Thus, a technical routine of gasification syngas reburning was chosen which can solve both tar and NO problems. In this work, a flow reactor made of a ceramic tube (50 mm in length, 8 mm in internal diameter) was used to investigate the characteristics of NO reduction by phenol, a typical tar produced from updraft biomass gasification. It can be concluded that: under the oxygen­enriched conditions, with the temperature increased, the efficiency of NO reduction was first increased which may be caused by the increasing quantity of hydrocarbon radicals produced by the oxygen attack on the benzene structure of phenol. With a further increase in temperature, the crack of phenol itself was enhanced and less oxygen is needed. Hydrocarbon radicals were consumed in the oxidative reactions, resulting in a decrease in NO­reduction ratio. Under the fuel­enriched conditions, the efficiency of NO reduction increased continuously with the temperature increased. The high temperature promotes the phenol decomposition as well as the reaction of NO reduction by hydrocarbon radicals. On the basis of the experiment results, a two­steps reaction mechanism of NO reduction by phenol is suggested. Phenol first decomposes into hydrocarbon radicals which have further reactions with NO. Verification of the mechanism was carried out by the comparison of the experimental and simulation results.

Keywords:

biomass, gasification, reburning, tar, NO

Topic:

R&D on Biomass Conversion Technologies for Heating, Electricity and Chemicals

Subtopic:

Gasification for synthesis gas production

Event:

21st European Biomass Conference and Exhibition

Session:

2CV.3.46

Pages:

868 - 871

ISBN:

978-88-89407-53-0

Paper DOI:

10.5071/21stEUBCE2013-2CV.3.46

Price:

FREE