Study On Gas Phase Conversion Characteristics Of Pollutant During Oxy-fuel Combustion

Coal plays an important position in our country's energy structure.With the rapid development of economy,the demand for coal is increasing,which result in various of environmental problems.Exploit some new energy sources and development of the clean energy technology become a hot research topic.As one of effective way to reduce CO₂ emission with low-cost,recently Oxy-fuel?O₂/CO₂?combustion technology become a research hotspots.C urrently,O xy-fuel combustion is still in the stage of experiment and semi-pilot study,it need deeply researches to resolve of the relevant issues in order to apply it to commercialization on a large scale.Firstly,the principle of Oxy-fuel combustion technology is described in this paper,summarize the development of it currently,and emphatically analyze C urrent Status of the Study of the main aspects,includes: CO₂ capture technology,the pollutant removal techno logy,the principle of heat transfer technology and the morphology and distribution characteristics of mercury.Secondly,the oxidation efficiency and distribution of CO in flue gas is compared under Oxy-fuel combustion with air combustion.The results show that the oxidation inhibition effect about CO under the O₂/CO₂ combustion atmosphere is more faster than in air combustion condition,and the effect decrease with the increase of the temperature.At the same time,SO₂ can inhibit the oxidant of CO obviously.The discovery is consistent with results of previous studies,which prove the reaction mechanism and model selection are reasonable.Finally,we studied the affection of SO₂ on the distribution and migration of mercury in the fuel gas.By comparing the distribution of mercury in the flue gas under the different atmosphere,we found that the flue gas can improve the conversion of mercury under O₂/CO₂ combustion,but there is controversy in many researches.HC l,H₂ O and SO₂ in the flue gas can promote the oxidation of mercury,but the degree and the effect of them is different.The further researches need to follow up.