- 著者
-
Suzuki Yoshizo
Ochi Shun-ichi
Kawashima Yukinori
HIRAIDE RYOSUKE
- 出版者
- 公益社団法人 化学工学会
- 雑誌
- Journal of chemical engineering of Japan (ISSN:00219592)
- 巻号頁・発行日
- vol.36, no.4, pp.458-463, 2003-04-01
- 被引用文献数
-
1
10
This paper describes the results of field measurements of nitrous oxide (N<SUB>2</SUB>O) emissions from fluidized bed sewage sludge incinerators. N<SUB>2</SUB>O was monitored continuously at six incinerators for 7–14 days. To study possible seasonal differences in N<SUB>2</SUB>O emissions, measurements were done at two incinerators in both summer and winter. N<SUB>2</SUB>O emissions varied with time, with large fluctuations in all incinerators. This result suggests that N<SUB>2</SUB>O emission factors determined by a grab sampling or short-term monitoring are not reliable. The average emission factors obtained were 1, 520–6, 400 g-N<SUB>2</SUB>O/t-dry sludge, which is much higher than the values of 800–1, 500 g-N<SUB>2</SUB>O/t-dry sludge published in "Good Practice Guidance and Uncertainty Management in National Greenhouse Gas Inventories" by the IPCC.<BR>N<SUB>2</SUB>O emissions were mostly determined by the highest freeboard temperature of the incinerator. N<SUB>2</SUB>O emissions were drastically lower at higher values of highest freeboard temperature. The relation of N<SUB>2</SUB>O emissions to the highest freeboard temperatures was nearly the same in all incinerators. This suggests that one can estimate the N<SUB>2</SUB>O emission factor of an incinerator by analyzing the freeboard temperatures for several weeks.<BR>Seasonal differences in N<SUB>2</SUB>O emissions from a small-capacity incinerator seemed to be due to the change in freeboard temperature. A large-capacity incinerator had the same N<SUB>2</SUB>O emissions in the summer and winter, because the change in freeboard temperature was small. Incinerators having larger incineration capacities tended to have higher N<SUB>2</SUB>O emission factors. This means that large capacity incinerators are operated with relatively low freeboard temperature.