Inlet effect on the coal pyrolysis to acetylene in a hydrogen plasma downer reactor
Inlet effect on the coal pyrolysis to acetylene in a hydrogen plasma downer reactor
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DOI:
10.1002/cjce.20049
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发表时间:
2008-06
影响因子:
2.1
通讯作者:
Yi Cheng;Jiaqi Chen;Yulong Ding;X. Xiong;Yong Jin
中科院分区:
文献类型:
--
作者:
Yi Cheng;Jiaqi Chen;Yulong Ding;X. Xiong;Yong Jin
Coal pyrolysis to acetylene in hydrogen plasma is a clean process for the coal utilization. A gas–solid downer reactor was employed to facilitate the high temperature reactions of coal pyrolysis in milliseconds. The effect of the inlet design on the coal injection was studied using CFD simulations, which were qualitatively compared with the cold model experiments in the prototype of a 2 MW hydrogen plasma reactor. The results revealed that the distribution of the coal particles near the inlet nozzles was significantly influenced by the layout of the flat-shaped nozzles and the operating conditions. Accordingly the heating efficiency of the particles by the hot gas showed strong dependence on the inlet design. The hot model tests demonstrated that the reactor performance characterized by the concentration of acetylene in the product gas increased from ∼7.6 to 9.6% by optimizing the nozzle design, which indicated the critical role of the nozzle design in the coal pyrolysis process. La pyrolyse du charbon en acetylene dans un plasma d'hydrogene est un procede propre pour l'utilisation du charbon. On a employe un reacteur a ecoulement descendant pour faciliter les reactions a haute temperature de la pyrolyse du charbon en millisecondes. L'effet de la conception de l'orifice d'admission sur l'injection de charbon a ete etudie a l'aide de simulations CFD, qui ont ete qualitativement comparees aux experiences dans un modele froid d'un prototype de reacteur a plasma d'hydrogene de 2 MW. Les resultats revelent que la distribution des particules de charbon pres des orifices d'admission est significativement influencee par la disposition des orifices de forme plate et les conditions operatoires. En consequence, l'efficacite de chauffe des particules par le gaz chaud montre une forte dependance envers la conception de l'orifice d'admission. Les tests de modele chaud montrent que la performance du reacteur caracterisee par la concentration d'acetylene dans le gaz de produit augmente de ∼7.6 a 9.6% en optimisant la conception de l'orifice, demontrant ainsi le rŏle critique de la conception de l'orifice dans le procede de pyrolyse du charbon.