Study On Preparation And Performance Of Adsorbent For Flue CO2Used For Enhancing Coalbed Methane

More frequent disasters caused by global warming seriously threaten the human security, so the environmental safety are increasingly attracted. Greenhouse effect caused by carbon dioxide emissions is the primary cause for global warming, so how to reduce carbon dioxide emissions or reduce atmospheric carbon dioxide concentration is a common challenge we have faced to protect the environment and human security.Coal-fired power plant not only emits a large amount of CO2, but also is the largest single source of carbon dioxide emissions, thus becoming the focus of CO2emission reduction. CO2captured and enriched from the coal-fired power plant emissions can be used for enhancing coalbed methane, which can not only reduce the CO2emissions, but raise the recovery rate of coalbed methane while achieving CO2geological sequestration, bring economic benefits and realizing the protection of the environment. After the desulfurization treatment, the flue gas of coal fired power plant still contains trace amounts of SO2, so a study on the performance of CO2adsorbent influenced by SO2is significant. In this thesis, phenolic resin spheres were prepared using commercial thermoplastic phenolic resin as raw material, after the treatment of water activation, ammonia activation, air oxidation heat treatment, respectively, phenolic resin-based activated carbon spheres were obtained with high specific surface area of1701.20m2/g and high pore volume of1.57cm3/g. Meanwhile, the adsorption ability of the phenolic resin-based activated carbon spheres was tested under the atmosphere of pure CO2, partial pressure (85%N2,15%CO2) atmosphere, and the atmosphere with SO2(35.5ppm), and the pore structure of three groups of spherical activated carbon were characterized. Combined with adsorption effect diagrams and pore structure parameters, the main conclusions are as follows:Phenolic resin-based activated carbon spheres got from the treatment of ammonia activation has the best adsorption capacity up to16.02wt%under the atmosphere of pure CO2.The main affective factors of the activated carbon adsorption capacity are not just specific surface area, but pore volume and the fraction of the mesopore.Adsorption performance of activated carbon is decided by structural properties such as surface area, pore volume and pore size distribution etc., as well as the surface chemistry of spherical activated carbon.The saturated adsorption capacity of phenolic resin-based activated carbon spheres will all decline for the treatment of water activation, ammonia activation and air oxidation heat treatment.