Clc facility comprising a solid/solid separator with means for distributing a gas-solid mixture

Patent metadata

Field	Value
Publication number	US-2021293407-A1
Application number	US-201917261509-A
Country	US
Kind code	A1
Filing date	Jul 18, 2019
Priority date	Jul 23, 2018
Publication date	Sep 23, 2021
Grant date	—

Abstract

The invention relates to a CLC plant for the combustion of solid hydrocarbon feedstocks generating particles of unburnt residues, comprising a solid/solid separator above the combustion reactor in order to efficiently separate the particles of the oxygen-carrying solid from the particles of unburnt residues contained in the gas/solid mixture ( 14 ) exiting from the combustion reactor. The chamber ( 1 ) of the solid/solid separator, the combustion reactor and the inlet ( 2 ) for the gas/solid mixture ( 14 ) of the chamber have a parallelepiped shape. The inlet ( 2 ) is equipped at its top with means ( 3 ) for distribution of said gas/solid mixture in the chamber which extend over the entire length of the inlet, improving the solid/solid separation.

First claim

1 . A plant for the chemical looping combustion of a solid hydrocarbon feedstock generating particles of unburnt residues and employing particles of an oxygen-carrying solid, the plant comprising:
a reduction reactor operating as fluidized bed in order to carry out the combustion of the solid hydrocarbon feedstock in contact with the particles of the oxygen-carrying solid, the reactor having a parallelepiped shape; an oxidation reactor operating as fluidized bed in order to oxidize the reduced particles of the oxygen-carrying solid originating from the reduction reactor by bringing into contact with an oxidizing gas; a solid/solid separator surmounting the reduction reactor in order to separate the particles of the oxygen-carrying solid from the particles of unburnt residues contained in the gas/solid mixture resulting from the reduction reactor, the solid/solid separator comprising a chamber of parallelepipedal shape comprising: a lower part operating as dense phase and an upper part operating as dilute phase; at least one inlet of parallelepipedal shape for the gas/solid mixture originating from the reduction reactor, the inlet emerging in the upper part of the chamber and being equipped at its top with means for distribution of the gas/solid mixture in the chamber which extend over the entire length of the inlet; at least one drain placed in the lower part of the chamber; at least one outlet located in the upper part of the chamber.

2 . The plant as claimed in claim 1 , additionally comprising a gas/solid separator fed by the outlet of the chamber of the solid/solid separator, the gas/solid separator comprising a pipe for discharge of a gas depleted in light particles of unburnt residues, and a transportation pipe in communication with the reduction reactor in order to recycle a stream containing the particles of unburnt residues to the reduction reactor.

3 . The plant as claimed in claim 1 , in which the chamber of the solid/solid separator and its inlet have a rectangular parallelepipedal shape.

4 . The plant as claimed in claim 1 , in which the reduction reactor has a rectangular parallelepipedal shape.

5 . The plant as claimed in claim 1 , in which the chamber of the solid/solid separator comprises two drains positioned at the bottom of the chamber on either side of the inlet.

6 . The plant as claimed in claim 1 , in which the inlet is centered in the chamber.

7 . The plant as claimed in claim 1 , in which the means for distribution of the gas/solid mixture in the chamber of the solid/solid separator comprise a beam of V-shaped section open toward the top of the chamber.

8 . The plant as claimed in claim 7 , in which the opening angle α of the V-shaped section of the beam is between 10° and 150°, and preferably between 10° and 90°, and more preferentially still between 10° and 40°.

9 . The plant as claimed in claim 7 , in which the top of the beam is at a distance H from the top of the inlet of between 0.5×L 2 and 5×L 2 , preferably between 0.5×L 2 and 3×L 2 and more preferentially still between 0.5×L 2 and 1×L 2 , L 2 being the width of the internal space of the inlet.

10 . The plant as claimed in claim 7 , in which the top of the beam has a width L 1 of between 0.1×L 2 and 1.5×L 2 , preferably between 0.2×L 2 and 1×L 2 and more preferentially still between 0.3×L 2 and 0.7×L 2 , L 2 being the width of the internal space of the inlet.

11 . The plant as claimed in claim 7 , in which the solid/solid separator additionally comprises means for cooling the inlet and the beam.

12 . The plant as claimed in claim 11 , in which the cooling means are metal tubes for the passage of a heat-exchange fluid, the tubes being fixed to an external face of the walls forming the inlet and to an internal face of the walls forming the beam.

13 . The plant as claimed in claim 1 , in which the means for distribution of the gas/solid mixture in the chamber of the solid/solid separator comprise a curved plate with a concavity facing the bottom of the chamber, the curved plate being connected to the two walls forming the inlet and being provided with at least two slots positioned on either side of a central part of the curved plate for the passage of the gas/solid mixture and its distribution toward the periphery of the chamber.

14 . The plant as claimed in claim 13 , in which the solid/solid separator additionally comprises means for cooling the inlet and the curved plate, preferably the cooling means being metal tubes for the passage of a heat-exchange fluid, the tubes being fixed to an external face of the walls forming the inlet and to an external face of the curved plate.

15 . The plant as claimed in claim 1 , in which the means for distribution of the gas/solid mixture in the chamber of the solid/solid separator comprise a cylindrical beam.

Assignees

• Ifp Energies Now
• Total Raffinage Chimie

Inventors

• Bertholin Stephane
• Cloupet Ann
• Guillou Florent
• Tilland Airy
• Amblard Benjamin
• Tebianian Sina
• Yazdanpanah Mahdi

Classifications

• F23C10/18

  Details; Accessories · CPC title

• F23C10/10 Primary

  the separation apparatus being located outside the combustion chamber · CPC title

• F23C2900/99008

  Unmixed combustion, i.e. without direct mixing of oxygen gas and fuel, but using the oxygen from a metal oxide, e.g. FeO · CPC title

• F23C10/01 Primary

  in a fluidised bed of catalytic particles · CPC title

• F23C10/08

  characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases · CPC title