Method and apparatus for drying a flow rich in carbon dioxide
AssigneeL'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
InventorsMathieu Leclerc, Félix Pere
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Abstract
In a method for drying a first wet gas stream containing at least 90 mol % CO2, the first CO2 stream is dried in a water adsorption unit, at least a portion of the regeneration gas from the adsorbers being a gas containing at least 90 mol % carbon dioxide produced in a separation apparatus (33) that separates a gas (31) containing carbon dioxide and at least one impurity by partial condensation and/or distillation at a temperature below 0° C.
Claims15
A method for drying a first wet gas stream containing at least 90 mol % CO2 on a dry basis, comprising:
- i) compressing the first wet gas stream to a first pressure in order to obtain a first wet gas stream at the first pressure,
- ii) drying the first wet gas stream in a water adsorption unit of the type implementing n adsorbers with, for each adsorber, a cycle comprising the following operating phases, which are offset from one adsorber to another by an nth of the duration (T) of the cycle:
- a. an adsorption phase comprising admission of the first wet gas stream into the adsorber via a first end of the adsorber, with circulation of the stream in the adsorber and simultaneous withdrawal, via a second end of the adsorber, of gas purified of water, and
- b. regeneration of the adsorber during which a regeneration gas regenerates the adsorber,
- removing water from the first wet gas stream in one of the adsorbers thereby producing a dried gas
- sending the regeneration gas to another of the adsorbers, the regeneration gas formed by adding a gas containing at least 90 mol % of carbon dioxide produced in a separation apparatus that separates a gas containing carbon dioxide and at least one impurity by partial condensation and/or distillation at a temperature of less than 0° C.,
- wherein the gas containing carbon dioxide and at least one impurity is not the dried gas and is not derived from the dried gas.
An apparatus for drying a first wet gas stream containing at least 90 mol % CO2 on a dry basis, comprising:
- i) a compressor for compressing a first wet gas stream to a first pressure in order to obtain a first wet gas stream at a first pressure,
- ii) a water adsorption unit of the type implementing n adsorbers with, for each adsorber, a cycle comprising the following operating phases, which are offset from one adsorber to another by an nth of the duration of the cycle:
- a. adsorption:
- this adsorption phase involving the admission of the first wet gas stream into the adsorber via a first end, called inlet end, of the adsorber, with circulation of this stream in the adsorber and simultaneous withdrawal, via the other end of the adsorber, of gas purified of water and
- b. regeneration of the adsorber during which a regeneration gas regenerates the adsorber,
- iii) a means for sending the first wet gas stream to the water adsorption unit,
- iv) a means for extracting a dried gas rich in CO2 from the adsorption unit,
- v) a means for sending a regeneration gas to the adsorption unit,
- the means for sending a regeneration gas to the adsorption unit being connected to a separation apparatus that separates a gas containing carbon dioxide and at least one impurity by partial condensation and/or distillation at a temperature of less than 0° C. so as to use a gas containing at least 90 mol % of carbon dioxide produced by the separation apparatus as regeneration gas,
- wherein the apparatus does not comprise means for sending the dried gas or a gas derived from the dried gas to be separated in the separation apparatus.
Dependencies are inferred from the claim text.