“The Texas Carbon Management Program is conducting a Front-End Engineering Design (FEED) of the Piperazine Advanced Stripper (PZASTM) for CO2 capture at the Mustang Station of Golden Spread Electric Cooperative (GSEC) in Denver City, Texas. This paper proposes the absorber design for the capture system and studies the operational strategies of the absorber in response to ambient temperature swing. The design uses 2 absorber trains and each train integrates absorption and water-wash section in one column. Each column has a cross-section area of 174 m2 and consists of 3 sections of MellapakPlus® 252Y structured packing. Packing heights for each section are 3, 4.9, and 2.7 m from top to bottom. A pump-around intercooler is applied at the bottom bed, circulates solvent, and eliminates the direct contact cooler.
The baseline CO2 removal is 90% and will vary between 78% to 90% with ambient temperature. The system uses air-cooling to eliminate cooling water usage. The water balance in the system will be managed by operating the water wash at a high circulation rate (1300 kg/hr) to condense water during the night and to make up for the water loss during the day.
The proposed design reduces the capital cost of absorber column by minimizing the packing height and eliminating the direct contact cooler (DCC) and improves the energy cost by lowering the pump-around intercooling temperature and increasing the pump-around rate.
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