Experimental method for desulfurizing and deashing coal by utilizing permeation and dissolution capacity of supercritical fluid

Abstract

The invention discloses an experimental method for desulfurizing and deashing coal by utilizing the permeation and dissolution capacity of supercritical fluid, and relates to the field of desulfurization before coal combustion. With a supercritical fluid technology as a core process, and mainly, through adjustment of the temperature and the pressure, the solubility of a solute in supercritical CO2is related to the density of the supercritical CO2; the temperature and the pressure jointly determine the density of CO2, the CO2 has special capacity in the supercritical state by changing the temperature and pressure conditions, organic sulfur in the coal is removed through selective dissolution and separation, and the effect of greatly reducing ash is further achieved while the organic sulfuris effectively reduced. The whole technological process is simple, convenient to operate, capable of easily achieving temperature and pressure control and suitable for large-scale industrialization;meanwhile, CO2 is non-toxic and pollution-free to the raw materials and has no influence on the coal quality; the desulfurization rate comprises that organic sulfur can be removed by 23%, inorganic sulfur can be removed by 70%, and the ash content is reduced by 32%.

Description

technical field [0001] The invention relates to the field of desulfurization before coal combustion, in particular to an experimental method for desulfurization and deashing of coal by utilizing the infiltration and dissolution capacity of supercritical fluid. Background technique [0002] China is rich in coal resources and is the world's largest coal producer and consumer. However, during the combustion of sulfur-containing substances in coal, high concentrations of SO are released into the atmosphere. 2 Harmful gases such as coal have adverse effects on human health and the growth of animals and plants. Post-combustion emissions cause a series of environmental problems such as air pollution, acid rain, and climate change. Therefore, how to desulfurize coal before combustion needs to be solved urgently. [0003] Inorganic sulfur in coal can be effectively removed by physical methods, and the process of gravity deashing is also accompanied by the removal of inorganic sulfur...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of removing complex organic sulfur in coal, the present invention provides an experimenta

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