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research-article

Real-time aerosol measurements in post-combustion CO2 capture using ELPI+TM and smooth & sintered collection plates

[+] Author and Article Information
Chiranjib Saha

PhD, Advanced Engineer, Southern Research; National Carbon Capture Center (NCCC), 31800 Highway 25 North, Wilsonville, AL, 35186, USA
csaha@southernresearch.org
x2csaha@southernco.com
chiranjib.saha.ju@gmail.com

Justin Anthony

P.E., Process Engineering Supervisor, Southern Company Services, Inc.; National Carbon Capture Center (NCCC), 31800 Highway 25 North, Wilsonville, AL, 35186, USA
jhanthon@southernco.com

1Corresponding author.

ASME doi:10.1115/1.4038782 History: Received August 14, 2017; Revised November 29, 2017

Abstract

The aerosols from CO2-depleted flue gas at the National Carbon Capture Center (NCCC) Pilot Solvent Test Unit (PSTU) and Slipstream Solvent Test Unit (SSTU) were measured in real-time using a Dekati Electric Low Pressure Impactor (ELPI+TM). The coal-fired flue gas is provided by Alabama Power's Gaston Power Plant Unit 5. The utilization of ELPI+TM for aerosol research in post-combustion CO2 capture is very important due to its quick response time with size classification as low as 6nm under transient conditions observed at the NCCC. Multiple tests were conducted at the PSTU and SSTU to quantify the effects of different process changes. The performance of smooth and sintered collection plates during dynamic process changes has been investigated. Between separate tests, upstream at Unit 5, a new baghouse was installed. The aerosols measured at SSTU, before and after the baghouse installation, are compared. PSTU measurements demonstrated sample sensitivity to transient intercooler start-up conditions and dilution gas temperatures. During the tests, the typical concentration ranged from E+06 to E+07 cm-3. The aerosol's Counter Median Diameter (CMD) for the sintered plates are lower (47nm to 60nm) compared to the normal plates (89nm to 130nm). The optical images indicate that sintered plates soak up all of the collected aerosols. The aerosol number concentration showed a significant drop after the baghouse installation. These results are promising and will enable the development of process control strategies to mitigate solvent losses and reduce O&M expenses.

Copyright (c) 2017 by ASME
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