コークス燃焼過程での CO, NO 生成におよぼす気孔構造の影響

概要

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Two types of coke samples, being different in pore structure, were prepared as follows : a) Pulverized coke was moulded to the desired rectangular shape after mixed with inorganic binder. This sample maintained the almost same pore structure as the packed column of pulverized particles. b) The sample cut from lumpy coke was held in the stream of CO_2/N_2 mixed gas at 1200℃ until carbon in coke was consumed to the required amount. Innumerable small hollows were made on the wall surface of the tubular pores. The former aggregate sample was most effective for decreasing the NO formation. As to the latter samples, NO formation was reduced with increasing the porosity of the sample. The blockage of the outer pores with fine incombustible particles was not desirable. Absorption of KOH showed the good effect on the elimination of NO when the combustion temperature rose. The analytical results of the conversion ratio of organic nitrogen to NO indicated that most of nitrogen oxides were formed inside of the outer surface in the case of porous samples, namely in pores. High CO/O_2 atmosphere was considered to be produced there and to be brought to the decrease of NO formation.
社団法人日本鉄鋼協会の論文
1981-09-01