Device and method for separating carbon dioxide from a gas stream, in particular from a flue gas stream, comprising a cooling water system

A process for removing carbon dioxide from a gas stream, the process comprising:

• feeding a gas stream to a gas cooler,
• cooling the gas stream within the gas cooler and condensing water out of the gas stream,
• taking water from the gas cooler, wherein at least a substream of the water from the gas cooler is fed to a treatment unit in which the water is purified for a further use in the process,
• spray cooling a second substream of the water from the gas cooler in a spray cooling unit configured to use water purified in the treatment unit as a spray cooling medium,
• returning water than has been spray cooled to the gas cooler, and
• feeding the cooled gas stream to an absorber of a removal apparatus in which carbon dioxide present in the gas stream is separated from the gas stream by means of a scrubbing medium,
• wherein the scrubbing medium loaded with carbon dioxide from the absorber is fed to a desorber of the removal apparatus in which the absorbed carbon dioxide is liberated from the scrubbing medium, and
• wherein the scrubbing medium loaded with carbon dioxide is fed into the desorber from the absorber without being preheated.

A removal apparatus for carbon dioxide from a gas stream, comprising:

• an absorber configured to separate carbon dioxide from the gas stream by means of a scrubbing medium,
• a desorber which is connected hydrodynamically to the absorber and configured to liberate absorbed carbon dioxide from the scrubbing medium,
• a gas cooler which is located hydrodynamically upstream of the absorber , which is configured to cool the gas stream, and which is configured to produce a stream of water,
• a spray cooling unit configured to use a spray cooling medium to spray cool a first portion of the stream of water discharged from the gas cooler;
• a treatment unit which is located downstream of the gas cooler and is configured for purifying a second portion of the stream of water discharged from the gas cooler, and
• a connection configured to deliver purified water from the treatment unit to the spray cooling unit where the purified water is used as the spray cooling medium,
• wherein the scrubbing medium is fed into the desorber from the absorber without being preheated.