Device for mixing gas and for distributing the resulting mixture to the inlet of a catalytic reactor
AssigneeIfp Energies Nouvelles
InventorsChristophe Boyer, Andre Nicolle
Life of this patent
Estimating the term…
Abstract
A device for mixing and distributing two gases upstream of the catalytic zone of a reactor by producing a homogeneous mixture and a profile of velocities which are as flat as possible. The device uses a plurality of internal chambers (I) enclosed in an external chamber (II), the external chamber communicating with each of the internal chambers via orifices pierced in the wall of said internal chambers (I) at a well-defined height. The external chamber (II) is provided with a perforated plate placed at a distance H2 from the inlet pipe for said chamber (II). The device is applied to the inlet of an autothermal reactor.
Claims8
A mixing and distributing device for a first gas and a second gas located upstream of a catalytic zone having an inlet section Ωr, said device comprising:
- a plurality of internal chambers (I) each with a diameter D1, an external chamber (II) with a diameter D2 enveloping the plurality of internal chambers (I), the density of internal chambers (I) being in the range 10 to 500 per m2 of the external chamber (II), each internal chamber (I) having an enlarged lower (III) zone terminating in an outlet section Ωs, each internal chamber (I) being provided with an inlet pipe (E1), and the external chamber (II) being provided with an inlet pipe (E2) and a perforated plate having orifices, the perforated plate (1) positioned at a lower distance H2 in the range 20 mm to 300 mm with respect to the inlet pipe (E2), and with a pitch between the orifices in the perforated plate (1) being in the range of D′/3 to D′/10, wherein D′ is defined as the difference between the pitch of the distance separating the internal chambers (I) and the diameter D1 of each internal chamber (I),
- the external chamber (II) communicating with each of the internal chambers (I) via a series of orifices (2) pierced in the wall of each internal chamber (I) in a zone located at a distance H1 with respect to the inlet pipe (E2), H1 being substantially equal to twice H2;
- and
- the angle (α) of the walls of the enlarged lower zone (III) with respect to vertical being in the range 5° to 45°;
- and
- wherein the sum of the outlet sections Ωs of the internal chambers (I) is less than the inlet section of the catalytic zone Ωr, in which case the device further comprises a distribution chamber (IV) interposed between the outlet sections Ωs and the inlet section Ωr of the catalytic zone, said distribution chamber (IV) having a height H3 in the range of 2 (D1) to 50 (D1), and when the sum of the outlet sections Ωs of the internal chambers (I) is less than the inlet section of the reaction zone Ωr, the distribution zone (IV) contains a jet breaker positioned at a height H4 below the outlet section Ωs of each internal chamber (I) such that H4 is in the range (D1)/4 to 2 (D1).
Dependencies are inferred from the claim text.