𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Effect of devolatilization on nitric oxide formation from coal nitrogen

✍ Scribed by Robert A. Vogt; Normand M. Laurendeau

Publisher
Elsevier Science
Year
1978
Tongue
English
Weight
318 KB
Volume
57
Category
Article
ISSN
0016-2361

No coin nor oath required. For personal study only.

✦ Synopsis

A simple heuristic model is proposed to explain the effect of devolatilization on both coal nitrogen conversion and NO formation. The model is cast into three temperature regimes, the intermediate regime II being initiated at Tk 1100 K. Regime II represents pyrolysis of repolymerized volatiles and thus accounts for the effects of temperature and temperature history on fuel nitrogen conversion. Based on this interpretation, NO formation results from volatiles combustion at i:igh temperatures and char combustion at low temperatures (T< 1100 K), in agreement with recent experimental data.

Coal typically contains O&2.0% nitrogen by weight. Hence, it is not surprising that large amounts of nitric oxide are formed during coal combustion owing to pyrolysis and oxidation of the following fuel-nitrogen constituents: pyridines, quinolines, amines, pyrroles and carbazoles1'2P'5. Depending on stoichiometry, a variety of nitrogen-containing products may be formed, as indicated by the following scheme'-':

NH,, HCN, NO ( fuel rich 1

πŸ“œ SIMILAR VOLUMES

Reaction of char nitrogen during fluidiz
Reaction of char nitrogen during fluidized bed coal combustionβ€”Influence of nitric oxide and oxygen on nitrous oxide
✍ G.F. Krammer; A.F. Sarofim πŸ“‚ Article πŸ“… 1994 πŸ› Elsevier Science 🌐 English βš– 473 KB

The conditions that favor the formation of nitrous oxide from char under fluidized bed combustion conditions are shown to be the oxidation of the char to make the nitrogen bound in the heterocyclic rings accessible so that it can react heterogeneously either with oxygen to form NO or with nitric oxi

The influence of bed-region stoichiometr
The influence of bed-region stoichiometry on nitric oxide formation in fixed-bed coal combustion
✍ G.P. Starley; F.W. Bradshaw; C.S. Carrel; D.W. Pershing; G.B. Martin πŸ“‚ Article πŸ“… 1985 πŸ› Elsevier Science 🌐 English βš– 853 KB

A 15.3 cm by 25.4 cm thick-bed reactor with refractory walls was used to investigate the influence of bedregion (first-stage) stoichiometry on fuel nitrogen evolution and reaction in coal-fired, mass-burning stokers. The combustor operated in a batch mode providing a Lagrangian simulation of the tim