Liquid desiccant and its application for pipeline drying.

(1997) Liquid desiccant and its application for pipeline drying. Masters thesis, King Fahd University of Petroleum and Minerals.


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English Abstract

Liquid desiccants are widely used for dehumidification of air. In order to analyze the performance of the system using desiccant technology, the thermophysical properties of desiccants are essential. In particular, the vapor pressure of the liquid desiccant is one of the important properties in dehumidification. Classical thermodynamic approach is used to predict the vapor pressure of lithium chloride at different concentrations. Simple mixing rules are then used to predict the vapor pressure , density and viscosity of the desiccant mixture namely calcium chloride and lithium chloride. Drying of petroleum transmission pipelines involves passing of dehumidified air with a certain initial water vapor concentration until the air attains saturation level. For this drying problem, the governing equations are derived and solved analytically as well as numerically with appropriate boundary conditions for the variation of dry air concentration and the drying time. Liquid desiccant used for dehumidification has to be reconcentrated for reuse. Instead of using thermal energy, a method is proposed in this thesis to use mechanical energy for regeneration. Osmotic pressure required to regenerate the weak desiccant for a given concentration is predicted. Correlations for predicting the pressure required for regenerating the weak desiccant are also developed for different operating parameters.

Item Type: Thesis (Masters)
Subjects: Mechanical
Department: College of Engineering and Physics > Mechanical Engineering
Committee Advisor: Gandhidasan, Palenchamy
Committee Members: Al-Farayedhi, Abdulghani A. and Sahin, Ali
Depositing User: Mr. Admin Admin
Date Deposited: 22 Jun 2008 13:45
Last Modified: 01 Nov 2019 13:49