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US 2025/0144581 A1Published application
Mixing system
AssigneeCasale SA
InventorsAndrea BERETTI, Iacopo CEREA
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Abstract
A mixing system configured to mix a process gas into a mainstream to be processed, the mixing system comprises a distribution channel, an injection unit and a static mixing unit; the injection unit comprises a manifold and a main injection ring, the manifold is adapted to receive said fluid or gas to be injected into the mainstream via said main injection ring, said main injection ring has a circular or annular structure and is provided with a plurality of injection orifices for introducing said process gas into the mainstream.
Claims19
1-18. (canceled)
A nitric acid plant, comprising:
- an absorption column;
- and
- a conditioning system for removing nitrogen oxides (NOX) from an input gas by selective catalytic reduction;
- wherein the conditioning system includes a catalytic reactor and a mixing system configured to mix a process gas into a mainstream, the catalytic reactor configured to catalytically reduce NOx contained in the input gas in presence a reducing agent, the mixing system configured so that the mainstream is the input gas directed to the catalytic reactor and the process gas is the reducing agent;
- wherein the mixing system includes:
- a distribution channel;
- an injection unit;
- a static mixing unit;
- wherein:
- the distribution channel has a main longitudinal axis which, in operation, determines the flow direction of the mainstream;
- the injection unit includes a manifold and a main injection ring;
- the manifold is arranged inside the distribution channel and is disposed perpendicularly to the main longitudinal axis of said distribution channel, said manifold is adapted to receive said process gas via said main injection ring;
- and
- said main injection ring has a circular or annular structure and is provided with a plurality of injection orifices that are arranged to introduce said process gas into the mainstream;
- wherein:
- in the absorption column, a NOx-containing gas is absorbed into water for production of nitric acid and a tail gas containing residual NOx is produced;
- said manifold of the mixing system is connected to a feed line of the reducing agent and said distribution channel (4) is connected to a tail gas output of said absorption column, so that the conditioning system is arranged to remove NOx from the tail gas of the absorption column.
14 more elements
A mixing system configured to mix a process gas into a mainstream, the mixing system comprising:
- a distribution channel;
- an injection unit;
- a static mixing unit;
- wherein:
- the distribution channel has a main longitudinal axis which, in operation, determines the flow direction of the mainstream;
- the injection unit includes a manifold and a main injection ring;
- the manifold is arranged inside the distribution channel and is disposed perpendicularly to the main longitudinal axis of said distribution channel, said manifold is adapted to receive said process gas via said main injection ring;
- said main injection ring has a circular or annular structure and is provided with a plurality of injection orifices that are arranged to introduce said process gas into the mainstream;
- wherein at least one of said main injection ring or any additional ring has a non-circular cross section having a convex side facing the flow direction of the mainstream;
- and
- at least one of said main injection ring or any additional ring has a semicircular cross section including a semicircular convex side facing the flow direction of the mainstream and a flat side, wherein the injection orifices are arranged on the flat side.
8 more elements
A mixing system configured to mix a process gas into a mainstream, the mixing system comprising:
- a distribution channel;
- an injection unit;
- a static mixing unit;
- wherein:
- the distribution channel has a main longitudinal axis which, in operation, determines the flow direction of the mainstream;
- the injection unit includes a manifold and a main injection ring;
- the manifold is arranged inside the distribution channel and is disposed perpendicularly to the main longitudinal axis of said distribution channel, said manifold is adapted to receive said process gas via said main injection ring;
- said main injection ring has a circular or annular structure and is provided with a plurality of injection orifices that are arranged to introduce said process gas into the mainstream;
- wherein said injection unit includes an injection conduct, said injection conduct extends longitudinally from said manifold and is provided with a plurality of injection tubes that are disposed lengthwise forming at least one row along the length of said injection conduct;
- said injection tubes are parallel to each other and are arranged so that for each row of tubes, each pair of consecutive tubes is made of two tubes of different length;
- each injection tube is provided with an aperture configured to eject said process gas with a flow direction perpendicular to the main longitudinal axis of the distribution channel;
- wherein the number of rows is two and wherein the said two rows are arranged on the opposite sides of the injection conduct.
9 more elements
Dependencies are inferred from the claim text.