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日本エネルギー学会誌 Vol. 82 (2003), No. 2

ISIJ International
belloff
オンライン版ISSN: 1882-6121
冊子版ISSN: 0916-8753
発行機関: The Japan Institute of Energy

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キーワードランキング

15 May. (Last 30 Days)

日本エネルギー学会誌 Vol. 82 (2003), No. 2

小型流動層を用いた廃棄物燃焼に伴う排ガス中ダイオキシン類の同族体分布の変化

畑中 健志, 北島 暁雄, 竹内 正雄

pp. 86-90

DOI:

10.3775/jie.82.86

抄録

Combustion experiments using a laboratory-scale fluidized-bed reactor were performed to elucidate the influence of chlorine content in wastes and combustion temperature on homologue profiles of poly-chlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) during incineration of model wastes with polyvinyl chloride or sodium chloride as a chlorine source and copper chloride as a catalyst. The experi-mental setup was carefully planned to obtain reliable data. In all experiments, the higher ratio of chlori-nation of PCDDs to PCDFs was obtained. As CO concentration in flue gas increased, the amount of PCDD/Fs increased and their homologue profiles were shifted toward higher chlorinated species. Such trends were more significant in PCDFs than PCDDs. The changes of the homologue profiles show that the major formation pathways are different between PCDDs and PCDFs. PCDDs could mainly form via materials that readily react with chlorine. The major formation pathways of PCDFs are strongly affected by combustion conditions.

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小型流動層を用いた廃棄物燃焼に伴う排ガス中ダイオキシン類の同族体分布の変化

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メタン予混合気による触媒燃焼の燃焼ガス特性

林田 和宏, 天谷 賢児, 新井 雅隆

pp. 91-96

DOI:

10.3775/jie.82.91

抄録

Burnt gas from a catalytic combustion of methane/air mixture was studied experimentally. Palladium catalyst supported on a cordierite honeycomb monolith was used. Methane/air mixture, which was pre-heated to 530K, was introduced into the honeycomb monolith. In the case of lean mixture, occurrence of the catalytic combustion was confirmed. When the equivalence ratio of the mixture was greater than stoichiometry, a blue flame appeared after the honeycomb monolith in addition to the cat-alytic combustion. To clarify the characteristics of burnt gas from the catalytic combustion, burnt gases were sampled by a quartz probe, and were analyzed using a fourier transform infrared spectrophotome-ter (FTIR). In addition, low level NO and hot-O2 in the burnt gases were detected using a laser-induced fluorescence (LIF). When the blue flame appeared after the honeycomb monolith, CO was detected from the burnt gas. And its concentration decreased around the blue flame. The NO emission level of the cat-alytic combustion was the highest when the equivalence ratio of the mixture was about 0.4.

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メタン予混合気による触媒燃焼の燃焼ガス特性

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キャベツをモデル化合物として用いた超臨界水ガス化の前処理としてのバイオマスの水熱液状化に関する研究

加藤 玲朋, 松村 幸彦

pp. 97-102

DOI:

10.3775/jie.82.97

抄録

Liquidization of wet biomass (cabbage) was conducted at 423-473 K and 1.2-1.3MPa. From observation with electron microscope and analysis of components, it was found that liquidization was caused by the breakdown of cell structure, mainly decomposition of hemicellulose. Liquidized product was slurry liquid, which could be described as a Newtonian fluid. The higher the temperature for liquidization treatment was, the lower the apparent viscosity of liquidized product was. It was also confirmed that gasification in supercritical water (673K, 25MPa) was promoted by liquidization treatment at 423 K.

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キャベツをモデル化合物として用いた超臨界水ガス化の前処理としてのバイオマスの水熱液状化に関する研究

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石炭液化反応塔に蓄積するシリカを核とする固形物の構造と生成機構

荒牧 寿弘, 坂西 欣也, 上田 成, 小林 正俊, 岩元 健太郎, 持田 勲

pp. 103-110

DOI:

10.3775/jie.82.103

抄録

Inorganic solid particles accumulated in the reactor of NEDOL bituminous coal liquefaction process were analyzed after their separation into larger and smaller particles than 106μm by SEM, XRD and solid-state 29 Si NMR. The larger particles than 106μm were extracted with HCl and aqua regia to observe residual core particle and to analyze the extracted inorganic substance by atomic adsorption and ICP.
The larger particles were found to carry silica and kaolinite core, and layered shells of Fe1-xS, CaCO3 of which cations were confirmed to be present in the extract. The smaller particles of uniform structure consisted principally of SiO2, Fe1-xS with small amount of Al2O3. Solid-state 29 Si NMR indicated variety of silicate compounds from siloxane (-60ppm) to quartz (-101ppm) in the particles. It is noted that the low temperature ashing provided similar kinds of ash particles to those found in the reactor, however there was no core-shell structured coagulation of particles, or quartz in the ash. Liquefaction conditions are very influential on the chemical species and their morphologies, suggesting the signifi-cant reactivity and deformability of the inorganic substances in the coal under liquefaction conditions.
Based on the above observation, accumulated particles in the reactor are produced by the following schemes.
1) Core-shell particle larger than 106μm is produced through deposition and adhesion of very fine Fe1-xS, CaCO3, SiO2 and siloxane particles to form the shell layer on the silica or kaolinite cores.
2) Core particles of SiO2 or quartz are produced through degradation of kaolinite or decomposition of siloxane. High crystallinity of SiO2 may be obtained through hydrothermal reaction under liquefaction conditions.
3) Uniform particles grow through deposition and adhesion of the fine particles of high reactivity such as CaCO3, SiO2 or Fe1-xS under liquefaction conditions.
4) Molecular forms of inorganic substances in coal are converted under liquefaction conditions into fine oxides, sulfides and carbonates, which have high reactivity or deformability for their adhesion, even fusing or crystallizing through hydrothermal reactions. Such a very fine particle, especially of SiO2 is a characteristic of the deposited solid in the liquefaction of Tanitoharm coal. They are assumed to be derived from kaolinite through its degradation and siloxane through its hydrolysis. Such a scheme of deposit formation appears contrast to that of brown coal which is basically derived from ion-exchangeable calcium ion.

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石炭液化反応塔に蓄積するシリカを核とする固形物の構造と生成機構

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