Photo-remediation of no2 plume
a technology of photoremediation and no2 plume, which is applied in the direction of chemical/physical/physical-chemical processes, separation processes, chemical/physical/physical-chemical processes, etc., can solve the problems of limiting control options, causing a very objectionable plume, and causing significant no.sub.x levels in coal/oil energy systems and diesel cycle energy conversion systems
Inactive Publication Date: 2003-01-23
SIEMENS ENERGY INC
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Benefits of technology
[0017] It is an object of the invention therefore to provide a method of reducing a visible NO.sub.2 plume within the exhaust.
[0018] It is a further object of the invention to provide a method of reducing a visible NO.sub.2 plume in exhaust gasses by irradiating the exhaust stack gasses with a source of illumination within the stack or optically coupled thereto.
[0019] It is an additional object of the invention to provide such a method of reducing a visible NO.sub.2 plume without requiring the presence of other chemicals or other processing steps to achieve the desired reduction.
[0020] It is a further object of the invention to reduce a visible NO.sub.2 plume in exhaust without producing undesirable by-products.
Problems solved by technology
The NO.sub.2 plume is evident in many DLN (dry low NO.sub.x) combustion systems, and determination of the actual source and mechanism of formation of NO.sub.2 in DLN systems has proven to be an intractable problem, limiting options for controlling it. NO.sub.2 may even be produced in conventional combustion turbine systems and also from some chemical processing facilities, such as nitric acid production plants.
Control of NO.sub.2 is important because, among other reasons, concentrations of only 20-30 ppm can produce a very objectionable plume.
In particular, coal / oil energy systems and diesel cycle energy conversion systems produce significant NO.sub.x levels and may have a noticeable plume.
Many of the photometric methods reviewed result in formation of undesirable byproducts such as sulfuric acid mist, ozone, and particulates.
Method used
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[0024] The present invention uses photo-remediation methods for reduction or elimination of a visible NO.sub.2 plume in exhaust gases emitted from turbine engines, power plants, or any chemical process which releases NO.sub.x into the environment. More specifically (and referring now to FIG. 1), visible NO.sub.2 emissions in an exhaust duct 1 of a combustion turbine engine, having a compressor section 2, a combustion section 3 and a turbine section 4. The turbine engine can optionally be equipped with a duct burner or auxiliary burner 6 which is another source of NO.sub.x. The NO.sub.2 is substantially reduced by photo-irradiating the exhaust gases 5 with at least one illumination source 7 located within the exhaust duct and / or stack or optically coupled thereto. The formation of secondary pollutants or byproducts (including sulfates and nitrates) is minimized, and additional processing steps are not required for removal.
[0025] The method takes advantage of low bonding energy that e...
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An photo-remediation method for reducing a visible NO2 plume is provided. The method uses an illumination source having a wavelength of at least 350 nm, and preferably between 350-400 nm to irradiate gases within an exhaust path, and requires no additional steps or processing requirements for reduction of the visible plume.
Description
[0001] 1. Field of the Invention[0002] This invention relates to a method for reducing a visible NO.sub.2 plume in an exhaust stack of a combustion or "gas" turbine power plant, other power plants or other combustion systems, including those in stationary or mobile applications.[0003] 2. Background Information[0004] Combustion turbines used in power plants comprise a compressor section, a combustion section, and a turbine section. A supply of air is compressed in the compressor section and directed into the combustion section. Fuel enters the combustion section by means of a nozzle. The compressed air enters the combustion inlet and is mixed with the fuel, which is then combusted to produce a high-temperature, high-pressure gas. This gas then exits past the combustor section via a transition section and is injected into the turbine section to run the turbine.[0005] The hot gases produced by the combustion section exit the power turbine and pass into a duct designed to convey these g...
Claims
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IPC IPC(8): B01D53/56
CPCB01D53/56B01D2259/804
Inventor RISING, BRUCE
Owner SIEMENS ENERGY INC