Simulation and optimization of sweetening and dehydration process of natural and refinary gas / Simulação e otimização dos processos de adoçamento e desidratação de gas natural e de refinaria

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Two processes are widely used in the gas processing: sweetening and dehydration. Sweetening consists in removing acid gases, H2S and CO2, while dehydration is for water removing. The presence of these components causes several problems with the handling and transport of the gas like toxicity, corrosion and hydrate formation. So, it is clear the importance of removing these contaminants, which is normally made through absorption process with amines solutions, for H2S and CO2, and triethyleneglycol for water. For the study of these processes, the use of process commercial simulators is welcome. For the quality data acquisition with the simulator many cares must be taken, such as, the good choice of the thermodynamic model that represents the system and the suitable choice of the method for calculating of the equipments. In the amines process, where the absorption occurs with the chemical reaction in electrolyte environment, the model is fundamental; besides the simulation method affects the results. This work presents a methodology to analyze the different equilibrium models applicable for sweetening and dehydration processes and selects the best one after the comparison with experimental data. It was introduced a new methodology for the efficiency calculation developed by Barros and Wolf, which is used for the simulation with phase equilibrium based method. This methodology is an alternative for the use of rate based method. The simulation without the efficiency concept results in, practically, complete absorption of H2S e CO2. Further, the values of these components in the treated gas are not affected with modifications in the parameters that normally affect the absorption. Considering the efficiency, it was possible to identify the influence of these parameters in the absorption. The influence of the efficiency is more evident on the sweetening process than on the dehydration, due to the fact that the first process is highly influenced by mass transfer. Sensibility analyses were carried out in order to optimize the absorber and the regenerator, separately. With these optimized conditions, both processes were presented with recycle, focusing the reuse of the solvent

ASSUNTO(S)

sweetening desidratação simulação por computador petroleo - refinarias dehydration refinary gas gas natural natural gas

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