Coal is the dominant primary energy source in China and the major source of greenhouse gases and air pollutants. To facilitate the use of coal in an environmentally satisfactory and economically viable way, clean coal...Coal is the dominant primary energy source in China and the major source of greenhouse gases and air pollutants. To facilitate the use of coal in an environmentally satisfactory and economically viable way, clean coal technologies （CCTs） are necessary. This paper presents a review of recent research and development of four kinds of CCTs： coal power generation; coal conversion; pollution control; and carbon capture, utilization, and storage. It also outlines future perspectives on directions for technology re search and development （R＆D）. This review shows that China has made remarkable progress in the R＆D of CCTs, and that a number of CCTs have now entered into the commercialization stage.展开更多
The idea of the transformation of coal in underground into synthetic gas so-called syngas is interested in world in many centuries. Underground Coal Gasification （UCG） is an in-situ technique to recover the fuel or ...The idea of the transformation of coal in underground into synthetic gas so-called syngas is interested in world in many centuries. Underground Coal Gasification （UCG） is an in-situ technique to recover the fuel or feedstock value of coal that is not economically available through conventional recovery technologies. Today, less than one sixth of the world＇s coal is economically accessible. Today, similarly to all other countries in the world also in Slovakia there is an interest in the revival and perfection of the UCG technology. From the viewpoint of content the research is directed toward to increasing heating capacity of syngas. From the standpoint of the methods used the research can be divided into 2 approaches： experiments in UCG laboratory and mathematical modeling, including simulation studies. Both approaches have helped to discover complicated relationships during UCG and they will be the subject of this paper. The most important factors are methods, the humidity of the coal, heat losses, temperatures in relevant zones, the composition of oxidation agents and the permeability of the coal. The calorific value of syngas was found generally to be 0.55-4.45 MJ.Nm^-3 with a maximum of 25.51 MJ.m^-3 if only air is used as the oxidation agent. Where a mixture of air and oxygen is used, calorific values in the range 0.43-6.38 MJ.m^-3 were generally obtained, with maximum 27.53 MJ·m^-3. Analysis was carried out on these big differences in order to improve UCG.展开更多
基金Acknowledgements The authors gratefully acknowledge the funding support from the National Key Basic Research Program of China （2013CB228500）, the National Natural Science Foundation of Chi- na （71203119）, and the Advanced Coal Technology Consortium of CERC （2016YFE0102500）.
文摘Coal is the dominant primary energy source in China and the major source of greenhouse gases and air pollutants. To facilitate the use of coal in an environmentally satisfactory and economically viable way, clean coal technologies （CCTs） are necessary. This paper presents a review of recent research and development of four kinds of CCTs： coal power generation; coal conversion; pollution control; and carbon capture, utilization, and storage. It also outlines future perspectives on directions for technology re search and development （R＆D）. This review shows that China has made remarkable progress in the R＆D of CCTs, and that a number of CCTs have now entered into the commercialization stage.
文摘The idea of the transformation of coal in underground into synthetic gas so-called syngas is interested in world in many centuries. Underground Coal Gasification （UCG） is an in-situ technique to recover the fuel or feedstock value of coal that is not economically available through conventional recovery technologies. Today, less than one sixth of the world＇s coal is economically accessible. Today, similarly to all other countries in the world also in Slovakia there is an interest in the revival and perfection of the UCG technology. From the viewpoint of content the research is directed toward to increasing heating capacity of syngas. From the standpoint of the methods used the research can be divided into 2 approaches： experiments in UCG laboratory and mathematical modeling, including simulation studies. Both approaches have helped to discover complicated relationships during UCG and they will be the subject of this paper. The most important factors are methods, the humidity of the coal, heat losses, temperatures in relevant zones, the composition of oxidation agents and the permeability of the coal. The calorific value of syngas was found generally to be 0.55-4.45 MJ.Nm^-3 with a maximum of 25.51 MJ.m^-3 if only air is used as the oxidation agent. Where a mixture of air and oxygen is used, calorific values in the range 0.43-6.38 MJ.m^-3 were generally obtained, with maximum 27.53 MJ·m^-3. Analysis was carried out on these big differences in order to improve UCG.
