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US 7,252,243 B2Granted
Injection nozzle for purification
AssigneeHaldor Topsoe A/S
InventorsIngvard Bjørn, Pär Gabrielsson
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AssigneeHaldor Topsoe A/S
InventorsIngvard Bjørn, Pär Gabrielsson
Estimating the term…
Method and apparatus for uniformly injecting a fluid stream into a gas stream at elevated temperature by means of an injection nozzle comprising a nozzle head and a supply inner tube being concentrically surrounded with an outer casing tube spaced apart from the inner supply tube. It comprises passing the fluid stream through the inner tube and the nozzle head and maintaining temperature of the fluid stream in the inner tube by providing thermal insulation in at least part of an annular space between the inner tube and the outer tube. Further it comprises maintaining a constant flow of the fluid inside the inner tube and nozzle head by plugging the nozzle head at outlet end and spraying the fluid stream through a number of nozzle holes provided in the nozzle head adjacent to the outlet end of the nozzle head.
Method of uniformly injecting a fluid stream into a gas stream at elevated temperature by means of an injection nozzle comprising a nozzle head and a supply inner tube being concentrically surrounded with an outer casing tube spaced apart from the inner supply tube, which method comprises
Injection nozzle for use in a method according to anyone of the preceding claims comprising a nozzle head being connected to a fluid stream supply tube, wherein the supply tube is concentrically and spaced apart surrounded by an outer casing tube;
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing…:…
Exhaust or silencing apparatus characterised by constructional features: having thermal insulation
Characterised by constructional aspects of converting apparatus: arrangements for supply of additional air
Adding substances to exhaust gases: the substance being catalytic material in liquid form
Term ended 5 Feb 2026 (estimated)
1. Field of the Invention
The invention relates to injection of a fluid into a gas by a nozzle. The invention is specifically directed to injection of a solution into a hot gas, where one specific use of the invention is in connection with NOx removal from exhaust gas from a diesel engine.
2. Description of Related Art
FIG. 1 is a cross section of a straight nozzle according to the invention.
FIG. 2 is a cross section of nozzle with a 90° bend according to the invention.
FIG. 3 is a cross section of an exhaust pipe with a nozzle according to the invention.
In diesel engine driven vehicles combustion takes place with a certain amount of excess air. This results in formation of nitrogen oxides, NOx in the exhaust gas, which is a serious pollution for the environment.
NOx can be reduced by ammonia, NH3, which is difficult to store in vehicles, and an aqueous solution of urea, H2NCONH2, is therefor used as a reducing agent.
The ammonia is formed when urea decomposes as it is sprayed out and mixed with the hot exhaust gas according to the following reaction: H2NCONH2+H2O→2NH3,+CO2