Xiaofeng Qi

Publication Date

8-2000

Advisor(s) - Committee Chair

Wei-Ping Pan, John Riley, Wei-Ming (Charles) Lee

Comments

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Degree Program

Department of Chemistry

Degree Type

Master of Science

Abstract

The emission of nitrogen oxides (NO, NO2 and N2O) from combustion of coal remains a problem of considerable interest – whether the concern is with acid rain, stratospheric ozone chemistry, or “green house” gases. This interest has led to a great deal of work on the kinetics and mechanism of reduction of NOx by various means. It is known that NO is rapidly converted to NO2 in the atmosphere, and then reacts with water vapor to form nitric acid. N2O has been identified as an active absorber of the earth’s radiation in the troposphere, contributing to the global warming of the earth’s face.

Coal pyrolysis and combustion are two industrial processes that release NOx. The pyrolysis of coal was studied using the TG/FTIR technique, and NH3 and HCN were identified as pyrolysis products. It is believed that NH3 and HCN may be converted to NO and N2O during combustion. The effects of temperatures and heating rates on the emission of NOx were also investigated. Most NO and N2O were released during the combustion step. Three different coals were burned during three 1000-hour runs to test the release of NOx in a Fluidized Bed Combustion System (FBC). The effects of excess air ratios, temperature, bed height, and secondary air/primary air ratio on the emission of NOx was studied. Automatic gas analyzers were used to measure NO and N2O.

Disciplines

Chemistry | Physical Sciences and Mathematics

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