Process and device for cooling a gas by direct heat exchange with a cooling liquid
AssigneeLinde Aktiengesellschaft
InventorThomas Nohlen
Life of this patent
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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).
Claims18
Process for cooling a gas by direct heat exchange with a cooling liquid, in which
- the gas (1) is introduced into the lower region of a direct contact cooler (2),
- a first stream of cooling liquid (8) is introduced into the direct contact cooler (2) above the point of introduction of the gas (1),
- cooled gas (5) is removed from the direct contact cooler (2) above the point of introduction of the gas (1), and
- a liquid backflow (10) is drawn off from the lower region of the direct contact cooler (2) and is passed on as return flow (11),
- characterized in that
- the temperature of the return flow is adjusted by a second stream of cooling liquid (13), whose temperature is lower than that of the liquid backflow (10), being introduced into the return flow at least for some period(s) of time.
Device for cooling a gas by direct heat exchange with a cooling liquid
- with a direct contact cooler,
- with means for introducing gas into the lower region of the direct contact cooler,
- with means for introducing a first stream of cooling liquid into the direct contact cooler above the point of introduction of the gas,
- with means for withdrawing cooled gas from the direct contact cooler above the point of introduction of the gas, and
- with means for withdrawing a liquid backflow from the lower region of the direct contact cooler,
- characterized by
- means for admixing a second stream of cooling liquid, whose temperature is lower than that of the backflow, into the liquid backflow, by
- a return line for the mixture comprising the second stream of cooling liquid and the backflow and
- by a control device for controlling the temperature of the return flow by setting the amounts of the first and/or second stream(s) of cooling liquid.
Dependencies are inferred from the claim text.