Thyssenkrupp Industrial Solutions Ag

Thyssen Krupp Ag

Uhde Gmbh

Thyssenkrupp Uhde Gmbh

Jürgen Fuchs

Rolf Siefert

Meinhard Schwefer

Michael Groves

Klaus Ruthardt

Rainer Maurer

Bernhard Hündgen

Bernhard HÜNDGEN

An apparatus is provided for treatment of process gas formed during nitric acid production by catalytic oxidation of NH. The apparatus includes a reactor, a first catalyst bed for NO decomposition, an absorption tower to react the NOformed with an absorption medium downstream of the first catalyst bed, a device for adding NHadded to tailgas entering the second catalyst bed, and a second catalyst bed for NOreduction and further decrease in NO in the tailgas exiting the absorption tower. The second catalyst bed contains at least one iron-loaded zeolite catalyst. NO removal in the first catalyst bed is limited such that the process gas exiting the first catalyst bed exhibits a NO content of &#x3e;100 ppmv and a molar NO/NOratio of &#x3e;0.25. Treated gas exiting the second catalyst bed has a NOconcentration of &#x3c;40 ppmv and a NO concentration of &#x3c;200 ppmv.

Method for removing NO and NOfrom the nitric acid production process, and an installation suitable for same

A method for disposing a bed comprising particles in a burner through which a gas can flow, more particularly in a burner basket of an ammonia oxidation burner, where the particles are disposed such that the bed has a greater flow resistance in an edge region of the burner than in an inner region of the burner. Further, a burner basket for a burner may have a bed comprising particles, wherein the particles are disposed such that the bed has a greater flow resistance in an edge region of the burner basket than in an inner region of the burner basket.

Method for arranging a packing in a burner and burner basket for a burner

A burner basket for an ammonia oxidation burner includes a gas-permeable bottom plate, with a side wall that is spaced apart from the bottom plate by a gap, and a retaining device covering the bottom plate and the gap for retaining particles of a bulk material that can be arranged in the burner basket. A fastening element is arranged on the bottom plate, by which the retaining device is fixed in place. An ammonia oxidation burner comprises a burner for oxidizing ammonia and a burner basket.

Burner basket for an ammonia oxidation burner

The invention relates to a process and apparatus for preparing nitric acid by catalytic oxidation of NHby means of oxygen and subsequent reaction of the NOformed with an absorption medium in an absorption tower, which comprises a catalyst bed for NO decomposition arranged in the process gas downstream of the catalytic NHoxidation and upstream of the absorption tower in the flow direction and a catalyst bed for NOreduction and effecting a further decrease in the amount of NO arranged in the tailgas downstream of the absorption tower in the flow direction,

[object Object]

A sealing system of a burner basket in an ammonia oxidation burner, wherein the burner basket has a wall that is anchored in the ammonia oxidation burner and the burner basket has a gas-permeable bottom plate, which is placed on further internal fittings of the ammonia oxidation burner and has a peripheral rim, wherein the wall and the gas-permeable bottom plate are not mechanically connected to each other, and so there is a gap between the wall and the peripheral rim of the bottom plate, wherein at the peripheral rim of the bottom plate a rim seal that is made up of individual segments is mounted movably by way of guiding pins and the rim seal projects over the gap between the peripheral rim of the bottom plate to the wall and lies against the wall.

Apparatus for minimizing bypass in ammonia oxidation burners

Improved reactors for catalytic, exothermic gas phase reactions with, as seen in the flow direction of a feed gas, which contains at least one oxidant and at least one component to be oxidized, an entry zone (), a reaction zone () comprising at least one catalyst () and an exit zone () for the product gas are described. The reactors, at least in the area of the entry zone (), have means, for example insulating jackets () and/or devices for the transport of cooling agents, which decrease the transport of heat produced in the reaction zone () into the entry zone () and thus decrease the risks of pre-ignition of the feed gas mixture employed or of the course of undesired side reactions in the entry zone () and/or wherein the inner walls of the reactor, at least in the area of the entry zone (), are elaborated from inert material. The feed gas enters into the entry zone () as a homogeneous gas mixture with respect to its substance composition via one or more feed lines (). The reactors can especially be employed for ammonia oxidation, for example in nitric acid plants, in which transition metal catalysts preferably elaborated in honeycomb form with smaller cross sections than the customarily employed platinum gauzes are used.

Device and process for catalytic gas phase reactions and use thereof

Improved reactors for catalytic, exothermic gas-phase reactions having, viewed in the flow direction of a feed gas, an inlet zone (), a reaction zone () containing at least one catalyst (), and an outlet zone () for the product gas, are described. The reactors are provided in the inlet zone () or in the inlet zone () and the reaction zone () with an insulating liner () and/or apparatuses for the transport of cooling media and/or the interior walls of the reactor in the inlet zone () or in the inlet zone () and the reaction zone () consist of inert material. The insulating liner and/or cooling media reduce heat transport from the reaction zone () into the inlet zone () and thus reduce the risk of preignition of the feed gas mixture used or occurrence of undesirable secondary reactions in the inlet zone ().

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Dortmund, Germany

Jürgen Fuchs