Process and device for cooling a gas by direct heat exchange with a cooling liquid
AssigneeLinde Aktiengesellschaft
InventorThomas Nohlen
Life of this patent
Estimating the term…
Abstract
For cooling a gas by direct heat exchange with a cooling liquid, the gas (1) to be cooled is introduced into the lower region of a direct contact cooler (2). A first stream of cooling liquid (8) is fed into the direct contact cooler (2) above the point of introduction of the gas (1). Cooled gas (5) is removed above the point of introduction of the gas (1) from the direct contact cooler (2). A liquid backflow (10) is drawn off from the lower region of the direct contact cooler (2). At least at times, a second stream of cooling liquid (13) with a temperature that is lower than that of the backflow (10) is fed into the liquid backflow (10) and combined with the latter to form a return flow (11).
Claims20
A process for cooling a gas by direct heat exchange with a cooling liquid, said process comprising:
- introducing gas (1) into the lower region of a direct contact cooler (2),
- introducing a first stream of cooling liquid (8) into the direct contact cooler (2) at a point above the point of introduction of said gas (1),
- removing cooled gas (5) from the direct contact cooler (2) at a point above the point of introduction of said gas (1), and
- drawing off a liquid backflow (10) from the lower region of the direct contact cooler (2),
- wherein the temperature of said liquid backflow is adjusted by introducing a second stream of cooling liquid (13), whose temperature is lower than that of said liquid backflow (10), into said liquid backflow at least for some period(s) of time, and
- wherein the first stream of cooling liquid (7, 8) and the second stream of cooling liquid (12, 13) are branched off from a main stream of cooling liquid (6), and the second stream of cooling liquid (12, 13) is routed past the direct contact cooler (2).
A device for cooling a gas by direct heat exchange with a cooling liquid, said device comprising:
- a direct contact cooler,
- conduit means for introducing gas into the lower region of the direct contact cooler,
- conduit means for introducing a first stream of cooling liquid into the direct contact cooler above the point of introduction of the gas,
- conduit means for withdrawing cooled gas from the direct contact cooler above the point of introduction of the gas,
- conduit means for withdrawing a liquid backflow from the lower region of the direct contact cooler,
- means for admixing a second stream of cooling liquid, whose temperature is lower than that of the backflow, into the liquid backflow,
- a return line for the mixture comprising the second stream of cooling liquid and the backflow,
- by a control device for controlling the temperature of the mixture by setting the amounts of the first and/or second stream(s) of cooling liquid, and
- means for branching said conduit means for introducing a first stream of cooling liquid and a conduit means for said second stream of cooling liquid from a main stream of cooling liquid, wherein said conduit means for said second stream of cooling liquid routs said second stream past said direct contact cooler.
Dependencies are inferred from the claim text.