石灰石脱硫反应活性的研究

脱硫剂石灰石的反应活性对流化床燃煤锅炉的脱硫效果影响很大。目前，国内外主要采用动力学方法，通过测定固态CaO的硫酸盐化程度来推断石灰石的反应活性。但是这在石灰石中含有许多其它杂质成分时是不够全面的，因为这些杂质成分对石灰石的脱硫反应活性影响很大，不能忽视。为此，通过测定流化床入口和出口的SO₂浓度变化来判断加入床中的石灰石样品的反应活性。由于凡是能引起SO₂浓度变化的物质都与石灰石的反应活性有关，从而克服了原有方法仅考虑CaO重量变化的片面性。本文也采用了动力学方法建立了石灰石反应动力学模型，并利用线性化方法对其反应速率常数Ｋ进行线性估计，建立了石灰石化学成分与活性关系的数学模型。

Study of desulphurization reaction activity of limestone.

The reaction activity of desulphruizer limestone has a great influence on the desulphurization effect of fluidized bed coal burning boilers.Now,the method of dynamics is used in normal applications by measuring the sulphation degree of the solid calcium oxide to infer the reaction activity of limestone;but it is not enough on condition of many types of impurity the limestone composition,which has considerable influence on the desulphurization reaction activity of limestone.The change of sulfur dioxide concentration of inlet and outlet of the fluidized bed is measured to determine the reaction activity of limestone samples in the bed in this paper.Since the material which will lead to the change of sulfur dioxide concentration has a relation to the reaction activity of limestone,this method overcomes the one sidedness of the method above,which only considers the weight change of calcium oxide.The method of dynamics is applied to establish the dynamic model of limestone reaction,and linearization method is employed to make linear estimates of reaction rate constant K so that the mathematical model between chemical composition and activity of limestone is built up.