NO and N{sub 2}O formation during char combustion: Is it HCN or surface attached nitrogen?
- Massachusetts Inst. of Tech., Cambridge, MA (United States). Dept. of Chemical Engineering
Several hypotheses have been proposed for the conversion of nitrogen organically bound in char to N{sub 2}O under fluidized bed conditions. A logical postulate is that N{sub 2}O is formed by the reaction of NO with organically bound nitrogen to form N{sub 2}O. An alternative pathway to N{sub 2}O formation during char combustion is by the oxidation of HCN. The relative rates of overall consumption of carbon, and of NO, N{sub 2}O, and HCN formation are provided by de Soete. The following experiments were designed to separate the contributions to N{sub 2}O formation by the HCN release during slow devolatilization, and to N{sub 2}O formation by the heterogeneous oxidation of char nitrogen. Coal particles were burned after being devolatilized for times which exceeded their burnout time. If HCN released during slow devolatilization is an important precursor to N{sub 2}O then increasing the time of devolatilization should decrease the nitrogen in the (resulting) char available for conversion to N{sub 2}O during oxidation. Moreover, if HCN is released during devolatilization but in presence of oxygen then N{sub 2}O should not be formed once the oxygen supply to the reactor is stopped.
- OSTI ID:
- 215700
- Journal Information:
- Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: 1-2 Vol. 104; ISSN CBFMAO; ISSN 0010-2180
- Country of Publication:
- United States
- Language:
- English
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