Master Thesis Presentation

Institut für Energietechnik
Energietechnik und Umweltschutz “AAS-Based CO2 Capture, Process Energy Demand and Capital Costs Reduction by adding an Inorganic Promoter”
http://www.co2crc.com.au/aboutccs/capture.html Oxy fuel process Pre-combustion process Post-combustion process CCS+ Siemens PostCap Process
http://www.energy.siemens.com/hq/en/power-generation/power-plants/carbon-capture-solutions/post-combustion-carbon-capture/ Promoters?? Split flow
Rich split
Intercoolers
Vapour recompression Solvent
(CCS+) Flowsheet
modifications Cost reduction
strategies Promoters Piperazine Hot potash Glycine Arsenite Boric acid DEA Solvents MMEA DEEA DIPA TEA DEA MEA MDEA Notz, I. T. (2011). Nazarko, A. O. (2010). Laboratory plant modification Results Equilibrium 14 - 20% power plant efficiency decrease lower energy consumption at the same lean loading Underdesigned absorber at two meters using a promoted solvent Overdesigned absorber at three meters using a promoted solvent The promoted solvent at
two meters height requires
a leaner loading to reach
the same capacity The promoter
does not affect
the equilibrium Carbon Sequestration and Storage Absorber Desorber Rich-lean heat exchanger Reboiler Flue gas stream Outlet stream mol CO2 / mol CCS+ Total reboiler
duty Sensible heat CO2
Absorption heat Latent heat 60 % 1.8 - 4.0ºC GHG before 2030 50 - 80 %
before 2050 Separation plant Transport Storage Depleted oil fields (EOR) Depleted natural gas field Saline aquifers ¿Technologies? q reb Objectives Modification and further start-up of the Siemens PostCap laboratory plant in order to adapt it to the future experiments that will be performed Experimental measuring of the absorber height reduction potential due to the addition of an inorganic promoter to the Siemens CCS+ solvent Experimental conditions Inlet gas conditions: 2.9 kg/h Nitrogen
0.6 kg/h Carbon dioxide Coal fired power plant conditions Experimental feed stage heights: Three and two meters Solvent with and without promoter Capture rate: 86 % Feed stage L/G ratio and reboiler duty Sample and titration process capture rate 86 % Juan Andrés Toledo Soto Conclusions The promoter utilization achieves a higher CO2 capture efficiency with the same interfacial area. A height reduction is possible.

The promoter does not affect the equilibrium and therefore the carbon dioxide loading.

A reduction of 33.3 % of the packing height is not possible.

Further experiments should be made in order to estimate the potential absorber height reduction under the conditions utilized in this work. Promoter effect Physical absorption Chemical absorption Siemens CCS+ Aminoacid salt Secondary amine Inorganic promoter Latent heat Absorption heat Sensible heat Benchmark: Three meters inlet stage and solvent without promoter With the same loading
the promoted solvent
requires less energy Average surface temperature 2m promoted solvent Benchmark 3m, promoted solvent 2m, promoted solvent Benchmark 3m, promoted solvent Benchmark 3m, promoted solvent 2m, promoted solvent 3m, promoted solvent Benchmark 2m, promoted solvent Physical solvation Carbamate formation Bicarbonate
formation