Linde Aktiengesellschaft

The Boc Group, Inc.

Linde Gmbh

Cannon Technology, Inc.

Other

Naresh J Suchak

Frank R Fitch

Shuen-Cheng Hwang

Ravi Kumar Jain

Ron C Lee

Steven Finley

Neeraj Saxena

Robert James Ferrell

John M Koltick, Jr

James K Tseng

Wesley M Rohrer, Jr

Arthur P Skelley

Kelly Visconti

Robert Edward Kelton

Joseph A Eschbach

Chester Gorski

Robert Aeiss

Lev Davydov

Zhixiong Cha

Shyam K Nadkarni

Steven Joseph Finley

Robert Zeiss

Nils Lindman

Industrial gas streams such as flue gas streams are treated for nitrogen oxides and other contaminants in dry or semi-dry scrubbers. After the flue gas stream has been contacted with a sorbent, ozone is mixed downstream into the flue gas stream thereby oxidizing the nitrogen oxides and other contaminants. The oxidized contaminants is contacted with sorbent present in the gas stream in the remaining height or volume of the scrubber downstream of ozone injection; and The sorbent is then separated from the flue gas stream leaving the dry or semi-dry scrubber.

Methods for removing contaminants from exhaust gases

A flue gas stream arising from fossil fuel fired sources containing nitrogen oxide contaminants is conveyed through an exhaust duct into a quencher. In the quencher aqueous medium is sprayed into contact with the flue gas stream. The quenched flue gas stream is mixed with ozone distributed at a high velocity in a sub-stoichiometric amount for partial oxidation of NOto form NOand prevent the formation of NO. The flue gas containing NOis absorbed into an acidic medium of a wet scrubber to form nitrous acid. In the scrubber the nitrous acid is mixed with selected compounds of ammonia to decompose the nitrous acid for release of nitrogen. With this process the consumption of ozone and the operating costs associated therewith eliminate the requirement to dispose of nitrate recovered from the scrubber purge stream.

Process for the removal of contaminants from flue gas streams

A method for removing contaminants from a gas stream by feeding the gas stream into a scrubber that can use seawater as the scrubbing medium. The gas stream is first scrubbed with the seawater and then mixed with ozone to remove the contaminants. Nitrogen oxides that are present in the gas stream are converted to nitric acid/nitrates and these are recovered via condensate or coalesced mist for neutralization. The treated gas stream is then treated by a second scrubber whereby other contaminants such as sulfur oxides, particulates and the like are removed and the thus treated gas stream is exhausted to the atmosphere. Optionally a droplet separator may be present in the scrubber.

An exhaust gas stream from a combustion process is conveyed through a gas distributor at an inlet of a wet horizontal spray scrubber where it is partitioned into a plurality of spaced apart gas streams. The gas stream is partitioned in the scrubber without the need for any physical partitions. A preselected number of the partitioned gas streams are mixed with ozone to oxidize the contaminants. The oxidized gas streams are then sprayed with an aqueous medium to capture the oxidized contaminants and remove them from the treated gas streams. The treated gas streams are then recombined with the untreated gas streams. Excess ozone present in the treated gas streams is consumed by oxidation of contaminants in the untreated gas streams before the combined gas stream is released to the atmosphere.

Method for removing contaminants from exhaust gases

A method for removing contaminants from the combustion gases generated by the incineration of waste. Air is injected into an incineration device along with a fuel and is supplemented by a oxygen feed. The resulting combustion waste gas stream contains contaminants such as nitrogen oxides and is quenched, then fed to a reaction zone where it will contact ozone for a predetermined period of time. The thus treated combustion waste gas stream can be fed to a scrubber assembly where the reaction products formed by the reaction of ozone and the contaminants are removed.

Methods for treating waste gas streams from incineration processes

An apparatus for removing contaminants from a gas stream includes a reaction chamber for receiving the gas stream; a gas-liquid contact assembly disposed in the reaction chamber; a sump disposed in the reaction chamber beneath the gas-liquid contact assembly, the sump containing a liquid scrubbing agent; a first inlet in communication with the sump for providing a reactive species to the liquid scrubbing agent in the sump for producing an oxidizing solution; a second inlet in communication with the reaction chamber for providing the gas stream to the reaction chamber; and a feed line having a first end in communication with the sump and a second end in communication with the reaction chamber above the gas-liquid contact assembly for dispensing the oxidizing solution to contact the gas-liquid contact assembly.

Gas stream purification apparatus

A method for removing contaminants from the effluent from metal pickling operations by oxidizing the contaminants in the effluent, passing the oxidized effluent to a first scrubber thereby removing mixed acid vapors and some nitrogen oxides and passing these scrubbed gases to a second scrubbing system while injecting ozone into a duct between the first and the second scrubbing systems thereby to oxidize nitrogen oxides to higher oxides and scrubbing the oxidized nitrogen oxides gas stream in the second scrubbing system.

In a method for removing a portion of contaminants, such as nitrogen oxides, from an exhaust gas stream of a combustion process, the exhaust gas stream is separated into two or more gas streams. At least one of the two or more gas streams is treated first by mixing with ozone. The treated gas stream is then fed to a scrubber where it is recombined with the untreated gas stream. Excess ozone present in the treated gas stream is consumed by oxidation of contaminants in the untreated gas stream before the combined gas stream is released to the atmosphere. The portion of the gas stream separated for mixing with ozone directly correlates to the amount of nitrogen oxides that are desired to be removed from the stream.

A method for producing ozone for use in ozonolysis reactions. Oxygen is separated from the mixture of ozone and oxygen from an ozone generation unit and is fed back to the oxygen feed to the generation unit. Nitrogen is fed to the ozone separation unit and the mixture of nitrogen and ozone is fed to the ozonation reactor where the ozone will react with organic compounds to produce desired end products.

Methods for the ozonolysis of organic compounds

A method for removing contaminants from a gas stream by feeding the gas stream into a scrubber that can use seawater as the scrubbing medium. The gas stream is first scrubbed with the seawater and then mixed with ozone to remove the contaminants. Nitrogen oxides that are present in the gas stream are converted to nitric acid/nitrates and these are recovered via condensate or coalesced mist for neutralization. The treated gas stream is then exhausted to the atmosphere.

An apparatus and method for removing contaminants from a gas stream is provided which includes (a) introducing the gas stream into a reaction chamber of a scrubber; (b) oxidizing first contaminants in a liquid phase with a reactive species in a sump of the scrubber for providing an oxidizing solution; (c) oxidizing second contaminants in a gas phase of the gas stream above the sump with excess reactive species disengaging from the oxidizing solution in the sump; (d) oxidizing and scrubbing third contaminants in a gas-liquid contact assembly disposed above the gas stream.

Gas stream purification apparatus and method

A method and apparatus for increasing the concentration of oxygen in the reaction medium present in the oxidation reactor. A volume of aqueous medium from the oxidation reactor is removed and pressurized and oxygen is added to it. The oxygen-rich volume of aqueous medium is then reintroduced into the oxidation reactor at an increased pressure to ensure adequate mixing with the aqueous medium having a lower content of oxygen.

Oxidation method and reactor

The present invention provides for process for inhibiting the levels of nitrogen oxides in process gas streams from sulfuric acid regeneration and sulfuric acid production plants. Partial oxidation of the nitrogen oxides is achieved by feeding a sub stoichiometric amount of ozone as to nitrogen oxides to the process gas stream.

Process for removing contaminants from gas streams

The present invention provides for process for inhibiting the levels of nitrogen oxides in process gas streams from sulfuric acid regeneration and production plants. The process gas stream from the waste heat boiler and the candle mist eliminator is contacted with ozone which will react with nitrogen oxides present in the flue gas.

The present invention provides for an improved process for producing ozone which can be used to remove contaminants from gas streams in industrial processes. The improved process uses a separation device after the ozone generating system to separate the ozone from the oxygen gas and directs the ozone to the industrial process and the oxygen back to the feedstream entering the ozone generating system. The improved process further provides for the use of ozone so generated to removed contaminants from industrial process flue gas streams.

Growing community of inventors

Glen Rock, NJ, United States of America

Naresh J Suchak