Mathematical modeling of limestone dissolution inbatch stirred tank reactors in presence of a dilutedstrong acid

摘要

The rate of limestone dissolution determines the need for limestone excess in flue gasdesulfurization processes and therefore affects the cost of makeup and waste disposal.For this reason a better understanding of the limestone performance towarddesulfurization can have reasonable economical effects. Utilizing a good mathematicalmodel it is possible to optimize the parameters involved in flue gas desulfurization. Inthe present work a mathematical model describing the transport phenomena occurring inlimestone-strong acid reaction in small BSTRs (Batch Stirred Tank Reactors) wasdeveloped and evaluated. The particle size distribution and the chemical reactivity wereconsidered as primary factors determining the volume variation of the natural limestone.The model together with the experimental procedure provides a new tool for measuringthe properties of chemicals used in flue gas desulfurization FGD.