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CARBONDIOXIDE LIQUEFACTION BY COMPRESSION

The project aims to liquefy gaseous carbon dioxide through multi-stage compression and pumping. This reduces environmental impact and is cost-efficient. It was determined that a service charge of $32 CAD per tonne of CO2 is required to break even over the 15 year project life. The model was deemed feasible based on economic and risk assessment.

The Why?

Carbon capture and storage is the process of liquefying carbon dioxide from industrial plants using compression and injecting it into reservoirs for storage. It is an environmentally friendly process that aims to lessen the industrial footprint by reducing CO2 emissions into the atmosphere. It also provides economic benefits by reducing the budget of mitigating CO2 emissions and generates profits from selling pure liquefied CO2 for Enhanced Oil  Recovery.

The gaseous CO2 feed is supplied at 25°C and 1 atm(a) at a rate of 10,000 tonnes per day and contained 1 mol% of nitrogen. The stream is initially compressed through a three-stage compression cycle with a 2.7 compression ratio each along with interstage cooling and contingency knock out drums. The compressed gas was then condensed using an ammonia refrigeration loop containing three compression stages, interstage coolers and a throttling valve, with ammonia feed at 1 atm(a) and -33°C. CO2 was condensed to a saturated liquid at -28°C as this temperature provided the most cooling power with least overall compression load. The compressed liquid is then pumped using two pumps in series to the desired product pressure of 110 atm(a). A final heat exchanger is used to heat the liquid to 30°C. The process was developed using pressure-enthalpy (PH) diagrams for CO2 and ammonia and modeled in VMGSim. Equipment specifications like flow capacity, heat duty, and dimensions were chosen and calculated with considerations for safety and robustness

The How?

Design Poster

Full Report:
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