Análise do processo de hidratação da cal virgem: proposta de implantação de rotina para o acompanhamento da eficiência de hidratação

Abstract

Coal Power Plants need to control SO 2 emissions to the atmosphere from the boiler flue gases, in order to reach standards according to guidelines determined by the Conselho Nacional de Meio Ambiente - CONAMA. One of the applications in thermal coal-fired power generation for this purpose is the use of hydrated lime, which is produced from lime at the power plant. Hydrated lime is injected into the equipment called desulphuriser that operates to capture the sulfur dioxide from the boiler flue gas. Due to the importance of this process, the present work aimed to evaluate several points that involve the production of hydrated lime from lime, such as the analysis of the quality of lime received, the study of the hydration process and the impact of the temperature of reaction according to the hydration efficiency through methodology and routine proposed. In addition, complementary analyzes were carried out on the characterization of lime and hydrated lime and the correlation between the main process parameters measured and recorded in lime hydration monitoring and control system. In relation to the results of hydration efficiency, it was possible to observe its increase when the maximum temperature of the reaction stage was lower, reaching results up to 85%.