432374 Packing Characterization: Advanced Model Development and Absorber Optimization

Wednesday, November 11, 2015: 3:15 PM
155B (Salt Palace Convention Center)
Chao Wang1, Micah Perry1, Gary Rochelle2 and Frank Seibert1, (1)SRP, University of Texas at Austin, Austin, TX, (2)Chemical Engineering, University of Texas at Austin, Austin, TX

Packing Characterization: advanced model development and absorber optimization

by Chao Wang1,2, Micah Perry2, Gary T. Rochelle1, Frank Seibert2

1Department of Chemical Engineering, The University of Texas at Austin

2Separations Research Program, The University of Texas at Austin

Austin, TX 78712

Packing is widely used in post-combustion CO2 absorption process because of its low pressure drop, good mass transfer efficiency, and ease of installation.  In this paper, three dimensionless mass transfer models based on absorption system were developed.  The effects of operating conditions and packing geometries were considered.  The new concept, Mixing Number was proposed to represent the packing geometry influence on mass transfer.  The three dimensionless mass transfer correlations developed in this work are:

 

   

The economic analysis of the absorber for a 250 MW coal-fired power plant was conducted, using the developed mass transfer models.  The purpose is to determine the optimal design and operating conditions for the amine scrubbing post-combustion absorber.  The Energy Cost (Energy) and the Annualized Capital Cost (CAPEX) for the absorber were calculated to determine the total processing cost as a function of the gas superficial velocity (uG).  For reaction film controlled system such as CO2 absorption, the optimum operating percent of flood is between 50 and 80% which is lower than the normal distillation design (usually between 70 and 90% of flood).  The optimal absorber design is to use packing with 200 to 250 m2/m3 surface area and high corrugation angle. 


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See more of this Session: Advances in Absorption
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