公开(公告)号：US20230382734A1

公开(公告)日：2023-11-30

申请号：US18038836

申请日：2021-12-17

申请人： Yara International ASA

发明人： Bent VIGELAND ,  Halvor ØIEN ,  Ronald RÖSLER ,  André DE SMET ,  Peter FAUCONNIER

IPC分类号： C01B21/28 ,  C01B21/46 ,  C01B21/40 ,  C25B1/04 ,  C25B9/05

CPC分类号： C01B21/28 ,  C01B21/46 ,  C01B21/40 ,  C25B1/04 ,  C25B9/05

摘要： A mono-pressure plant for the production of nitric acid, comprising



an ammonia convertor configured for operating at a working pressure ranging between 2 bar and 16 bar, for oxidizing ammonia, thereby producing a gaseous NOx gas/steam mixture;
an air compressor in fluid communication with the ammonia convertor, for pressurizing air to the working pressure;
an absorber unit, wherein the nitrogen oxides contained in a gaseous NOx stream react with water, thereby producing nitric acid;
a first bleacher unit for stripping the dissolved nitrogen oxides from the output product stream, thereby producing a first NOx-loaded stripping gas; and
a means for directing the first NOx-loaded stripping gas to an inlet of the absorber unit.

公开(公告)号：US20240228284A1

公开(公告)日：2024-07-11

申请号：US18559214

申请日：2022-05-25

申请人： Yara International ASA

发明人： Ronald RÖSLER ,  André DE SMET

IPC分类号： C01B21/46 ,  B01D19/00 ,  C01B21/28

CPC分类号： C01B21/46 ,  B01D19/0036 ,  C01B21/28

摘要： A system for evacuating NOx gases from a nitric acid storage tank in a nitric acid production plant. The production plant includes a gas ejector with at least two gas inlets and at least one gas outlet, wherein a first gas inlet is branched from a gas conduit through which NOx-containing gas is flowing at a pressure P1 ranging from 2 to 16 bar; a second gas inlet is fluidically connected to the nitric acid storage tank essentially maintained at atmospheric pressure; and a gas outlet is fluidically connected to a gas conduit through which NOx-containing gas is flowing at a pressure P2 lower than P1. A method for evacuating NOx gases from a nitric acid storage tank, a method for revamping a system of a nitric acid plant, and the use of a gas ejector for evacuating NOx gases from a nitric acid storage tank in a production plant.

公开(公告)号：US20230264957A1

公开(公告)日：2023-08-24

申请号：US18024170

申请日：2021-09-14

申请人： Yara International ASA

发明人： Bent VIGELAND ,  Halvor ØIEN ,  Ronald RÖSLER ,  André DE SMET ,  Peter FAUCONNIER

IPC分类号： C01B21/40 ,  B01D53/56

CPC分类号： C01B21/40 ,  B01D53/56 ,  B01D2252/103 ,  B01D2257/404

摘要： A dual pressure plant for the production of nitric acid, comprising:



an air compressor;
a converter, operating at a low pressure (LP), operable to be fed with a stream of an ammonia/pressurized air mixture to produce an LP gaseous NOx gas/steam mixture, comprising water, NO, NO2 and N2O4;
a NOx gas compressor;
an absorber unit (6); and
a bleacher unit;

wherein

the plant comprises means for directing the NOx-loaded stripping gas to the downstream side of the NOx gas compressor;

the plant being characterized in that it further comprises

a high-pressure (HP) water electrolyser, in fluid communication with the bleacher unit.

公开(公告)号：US20200338518A1

公开(公告)日：2020-10-29

申请号：US16956181

申请日：2018-12-19

申请人： YARA INTERNATIONAL ASA

发明人： Kjetil BAKLI ,  Kevin DRING ,  Øystein NIRISEN ,  Marcel DELHAYE ,  André DE SMET

IPC分类号： B01J10/00 ,  C01B21/20 ,  B01J19/24

摘要： Catalyst support systems for ammonia oxidation burners comprising a top flange and an inner wall. The top flange comprises a planar section, a rounded outer edge, and a rounded inner edge, the rounded outer edge and the rounded inner edge being separated by the planar section. The inner wall comprises a carrier plate, a gauze shelf, and a bottom plate shelf, the gauze shelf and the bottom plate shelf being attached to the carrier plate. The carrier plate is attached to the top flange by means of the rounded inner edge.