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 (520Kb)
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| Yoshizo Suzuki | |
| Thermal Energy and Combustion Engineering Department, | |
| National Institute for Resources and Environment, AIST, MITI | |
| Onogawa 16-3, Tsukuba, Ibaraki, 305-8569 Japan | |
| Phone +81-298-61-8225, Fax +81-298-61-8209 | |
| E-mail y_suzuki@nire.go.jp |
9,040,000 Yen
(FY 1999; 4,309,000 Yen)
A reduction method of nitrous oxide (N2O) emission from fluidized bed combustion by addition of particles, which decompose N2O in the combustor, to bed materials was tested. Al2O3 particles was mixed with sand particles and recirculated in the combustor. N2O emission was decreased to 2/3 of original value at mixing ratio of 35% by weight when coal was burned. NO emission was not changed in this mixing ratio. N2O was reduced efficiently at higher mixing ratio. However, two times higher NO emission was observed at higher mixing ratio. Catalytic N2O decomposition and simultaneous SO2 absorbing by CaO and several kinds of ceramic particles were examined to use cheaper additives in the fluidized bed combustion. The particle containing CaO and Al2O3 destruct N2O rapidly in reducing condition. In oxidizing condition, Ca mainly decomposes N2O. When Ca or Al exists as a silicate, however, catalytic N2O decomposition becomes slow. It means that the ceramic mainly consists of Ca and Al has N2O destruction ability. For example, cement particle can be used as N2O destruction additive.
Nitrous oxide, stationary sources, reduction technology, Nitrous Oxide, Combustion, Mitigation methods