Method and apparatus for drying and compressing CO₂-rich flow

摘要

In a method for compressing a water-containing CO2-rich fluid wherein the CO2-rich fluid is compressed in a compressor located upstream from the compression step, an antifreeze agent is injected into the water-containing CO2-rich fluid in order to lower the water solidification temperature. The antifreeze agent-containing CO2-rich fluid is frozen, water is extracted from the frozen fluid, and the frozen fluid is compressed in the compressor.

主权项

1. A process for compressing a CO2-rich fluid comprising CO2 and water, the method comprising the steps of:
dividing the CO2-rich fluid into a first portion and a second portion upstream of a compressor; injecting an antifreeze into the first portion to create an antifreeze-containing CO2-rich fluid; sending the second portion of the CO2-rich fluid to a bottom of a degassing column; mixing an overhead gas from the degassing column with the antifreeze-containing CO2-rich fluid to create a mixture, cooling the mixture and then sending the mixture into a phase separator; extracting water containing antifreeze from the phase separator leaving a cooled CO2-rich fluid within the phase separator, wherein the cooled CO2-rich fluid contains a substantial amount less water as compared to the CO2-rich fluid; sending the water containing antifreeze to a top of the degassing column; and withdrawing the cooled CO2-rich fluid from the phase separator and comprising the cooled CO2-rich fluid in the compressor to produce a compressed fluid.