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Beginning: Automatic CO2 Capture Pilot Plant

Beginning: Automatic CO2 capture pilot plant

By definition, a CO2 capture plant is a process or facility specifically designed to capture or remove CO2 from a combustion flue gas stream, refinery gas stream, or other industrial gas stream sources. Historically, CO2 has been captured from gas streams for the purpose of either producing CO2 as a usable marketable product or to remove it from a marketable product such as natural gas. However, due to climate change, there is an increasing demand to capture CO2 whether or not there is a market in an effort to minimize the carbon footprint in our surrounding environment. Post-combustion CO2 capture plants are the most common type of process used at fossil fuel-fired power generating plants. Similar CO2 capture plant processes are used at refineries and other industrial sources. The process typically utilizes a chemical solvent, such as an alkanolamine in an aqueous solution, which when in contact with CO2 forms a chemical reaction. This reaction occurs in a column vessel known as the absorber, when feed gas from the bottom section of the column passes upward as the aqueous liquid from the top of the column passes downward. The reaction is reversed in the presence of heat in another packed filled column known as the stripper (Desorber) column. Heat is supplied to the stripper by a reboiler, which gets its heat supply from any available source such as steam, glycol, hot oil and direct heat. The aqueous solvent is continuously circulated between the absorber and stripper column via a series of strategically located heat exchangers, pumps, filters, and other associated equipment. CO2 is flashed off from the stripper, cooled to remove water content, and finally compressed to the required delivery pressure. The remaining gases from the absorber are scrubbed and vented back to the atmosphere