Oxygen production method and plant using chemical looping in a fluidized bed
OwnerFlorent GUILLOU, Ali Hoteitinventors
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Abstract
The invention relates to a method and to a plant for producing high-purity oxygen, said method comprising a chemical loop wherein circulates a fluidized bed material having the capacity to release gaseous oxygen through oxygen partial pressure lowering, at a temperature ranging between 400° C. and 700° C. The oxygen thus produced can be used in applications such as oxycombustion methods, production of syngas under pressure or FCC catalyst regeneration.
Claims9
1) A method for producing high-purity oxygen, operating under fluidized bed conditions and comprising a chemical loop, wherein the following stages are carried out:
- oxidizing an oxygen-carrying solid in an oxidation reaction zone (R1),
- carrying under fluidized bed conditions said solid in a maximum oxidation state to an oxygen production zone (R2),
- releasing the oxygen from said solid in the production zone by lowering the oxygen partial pressure at a temperature ranging between 400° C. and 700° C.,
- recycling under fluidized bed conditions said solid in a decreased oxidation state to the oxidation zone,
- producing an oxygen-containing gaseous effluent through a discharge line at the outlet of production zone (R2),
- wherein the oxygen-carrying solid is a compound having the following formula:
- AxMnO2-δyH2O, with 0<x≦2, 0≦y≦2 and −0.4≦δ≦0.4, where A is an alkaline or alkaline-earth ion, or a mixture of alkaline and/or alkaline-earth ions, or a compound selected from among:
- manganese oxides of OMS type comprising at least one manganese oxide of general formula AxMnyOz-δ having a molecular sieve structure with a layout in form of channels of polygonal section, where 0<x≦2, 5≦y≦8, 10≦z≦16, −0.40≦δ≦0.4, and where A is at least one element selected from the group comprising U, Na, K, Pb, Mg, Ca, Sr, Ba, Co, Cu, Ag, Tl, Y, or mixed iron-manganese oxides of general formula (MnxFe1-x)2O3 with x ranging between 0.10 and 0.99, and whose oxidized form has a bixbyite and/or hematite structure.
3) A method as claimed in any one of the previous claims, wherein the oxygen-carrying particles belong to group A and/or B of the Geldart classification.
4) A method as claimed in any one of the previous claims, wherein the oxidation reaction zone and the oxygen production zone are operated at a temperature ranging between 500° C. and 600° C.
5) A method as claimed in any one of the previous claims, wherein the residence time of the oxygen-carrying solid ranges between 10 and 600 seconds in oxidation zone (R1) and between 1 and 360 seconds in oxygen production zone (R2).
7) A plant for producing high-purity oxygen, operating under fluidized bed conditions and comprising a chemical loop, including:
- an oxidation reaction zone (R1) containing an oxygen-carrying solid and comprising a supply line for an oxygen-rich effluent, a discharge line for an oxygen-poor gaseous effluent and means for carrying under fluidized bed conditions said solid in a maximum oxidation state to an oxygen production zone (R2),
- the oxygen production zone comprises means for lowering the oxygen partial pressure at a temperature ranging between 400° C. and 700° C., said partial pressure lowering means comprising a delivery line for feeding an oxygen-poor effluent into said production zone, a discharge line for a gaseous effluent rich in oxygen produced and means for carrying under fluidized bed conditions said solid in a decreased oxidation state to the oxidation zone.
Dependencies are inferred from the claim text.