ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Design simulations for a biogas purification process using aqueous amine solutions
Richard A. Gawel
Department of Solid State Chemistry, Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Aleja Mickiewicza 30, 30-059 Krakow, Poland
Abstract: Using the simulation program CHEMCAD, performance characteristics, design optimization, and costs of an absorption/stripping
system used to purify 100 kg h−1 of biogas in a biogas power plant were investigated. Potential absorbents used in the chemical absorption process were the
following aqueous solutions: pure diglycolamine, diglycolamine/piperazine, and diglycolamine/methyldiethanolamine/piperazine.
Mixtures for agricultural biogas purification to below 1 vol. % of CO2 and 4 × 10−4 mass % of H2S were determined via a simulation in the above mentioned program. The chosen mixtures were then entered into an absorption/desorption
system and simulations for each unit were provided by CHEMCAD. From the simulation results, the design parameters were calculated
and entered into each unit’s “cost estimation” section in the aforementioned program to estimate the purchase costs of the
apparatuses. Taking into account the installation, maintenance, as well as other additional costs, the actual machine purchase
costs were multiplied by the Lang factor. Costs of additional streams were also calculated by multiplying the ten-year utility
losses by their respective cost factors. From these calculations, the absorbent mixture, allowing biogas production at the
lowest estimated costs for ten years, was found.
Keywords: amine sweetening – biogas purification – chemical absorption – cost comparison
Full paper is available at www.springerlink.com.
Chemical Papers 66 (11) 1010–1018 (2012)