【摘要】 将45⁶3μm和90¹50μm的方解石矿物在空气与氧/燃料条件下进行沉降炉实验,研究了燃烧气氛、颗粒粒径以及SO₂对方解石转化行为的影响。研究表明:方解石颗粒在氧/燃料燃烧条件下发生破碎,气氛中CO₂浓度越高,方解石的破碎越弱;方解石样品粒径越大,破碎越明显。气氛中CO₂的浓度越高,CaCO₃的分解越弱,90¹50μm的方解石分解程度大于45⁶3μm的方解石。气氛中存在体积分数为0.3%的SO₂时,氧/燃料燃烧条件下CaSO₄的生成量大于空气燃烧气氛,SO₂的存在促进CaCO₃的转化。更多还原

【Abstract】 The effects of oxy-fuel combustion,particle size and SO₂ on the transformation behavior of calcite were investigated by experiments on a lab-scale drop tube furnace.Calcite samples of45⁶3 μm and 90¹50 μm were treated under different combustion conditions.The results show that fragmentation of calcite samples takes place under oxy-fuel combustion.Particle fragmentation decreases with increasing CO₂ concentration.The calcite fragmentation degree also increases with increasing sample particle size.The fraction of CaCO₃ that is transformed decreases when the concentration of CO₂ increases;it is higher for the sample of 90-150μm than that of 45⁶3 um.When0.3%（volume fraction） SO₂ is added into the atmosphere,the content of CaSO₄ in the residues under oxy-fuel conditions is higher than air conditions.Moreover,the fraction of CaCO₃ that is transformed under all conditions increases when SO₂ is added.更多还原