Experimental study of the kinetics of the adsorption of nitrogen by coal containing different amounts of water

• Autor(a) principal: XIAOMING,NI
• Data de Publicação: 2019
• Outros Autores: LIU,ZEDONG, JIANPING,WEI, ZHAO,YONGCHAO
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Anais da Academia Brasileira de Ciências (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500503
• topic: adsorption kinetics; adsorption rate constant; primary structural coal; moisture content.

Abstract: Useful insight can be gained into the underlying adsorption mechanism by studying the adsorption of nitrogen by primary structure coal with different water content. In this work, a coal-adsorption gas experimental system is used to investigate the adsorption of nitrogen by coal samples containing different amounts of water ( 2.894%, 1.871%, 0.897%, and 0%) and different pressures (0.7, 1.2, 1.7, 2.2, 2.7, 3.2, and 3.7MPa). The adsorption rates under the different conditions were calculated using a volume method, and the adsorption kinetics investigated using a kinetic model. The results show that an adsorption model based on an opposing process characterizes the adsorption behavior better than the pseudo-first order kinetic model and pseudo-second order kinetic model. The adsorption rate constant, k, reflects the rate at which the gas can get into the pores of different sizes in the coal a greater k value, implies a greater increment in the rate. The k value is found to decrease when the initial pressure is increased for the same moisture content. Also, the greater the water content, the smaller the value of k for a given initial pressure. As the moisture content continues to increase, the k value tends to a certain value. The results presented can provide an experimental basis for the study of the mechanism responsible for the adsorption of nitrogen by primary structure coal with different moisture content.