A device for introducing a liquid reducing agent into an exhaust gas purification system includes a gas line for receiving and carrying a gas, a reducing agent line for receiving and carrying a liquid reducing agent, a mixing chamber for mixing the reducing agent with the gas, the mixing chamber fluidically connected to the gas line and to the aid reducing agent line, a metering valve disposed in the reducing agent line; and a control device for controlling a pressure in the reducing agent line dependent upon a gas pressure in the gas line. The control device can also be used for controlling the reducing agent throughput in the reducing agent line in dependence on the gas pressure in the gas line.

Device for introducing a liquid reducing agent into an exhaust gas purification system

A method of reducing the nitrogen oxide level in the flue gases issuing from combustion units by introduction of reducing agents into contact with gases containing nitrogen oxides in first and second reducing stages, is provided. The first reducing stage is a non-catalytic stage (e.g. at temperatures over 800 °C), while the second stage is a catalytic stage (e.g. at temperatures of about 300-400 °C). A steam generation boiler with improved nitrogen reduction facilities is also provided. The amount of nitrogen oxides in the hot gases is reduced in the combination of the first and second reducing stages while producing steam in a steam generation boiler system, thus resulting in gases essentially free from nitrogen oxides while eliminating the possibility of NH3 (or other reducing agent) slip in the exhausted flue gases. Heat transfers in a convection section are used to establish stabilized temperature conditions for catalytic reduction.

A method of purifying gases containing nitrogen oxides and an apparatus for purifying gases in a steam generation boiler

Nitrogen oxides can be removed from turbines by a selective catalytic reduction (SCR) with ammonia with greater efficiency than by prior art technique if the ammonia needed for the reduction of the nitrogen oxides is added before the turbine, preferably in a stoichiometric excess compared to the contents of nitrogen oxides in the exhaust gas. One can employ well-known SCR catalysts and advantageously the exhaust gas after the turbine is passed through a layer of SCR catalyst followed by a layer of a combustion catalyst. The latter expediently consists of metal oxides, preferably selected from copper oxide, manganese oxide and chromium oxide, deposited on aluminum oxide, magnesium oxide, silicon oxide or mixtures thereof.

A process for the removal of nitrogen oxides from offgases from turbines.

Experimental and numerical study on the effective thermal conductivity of channel thermal insulation plate

Eine Einrichtung (2) zum Einbringen eines flussigen Reduktionsmittels (8) in eine Abgas-Reinigungsanlage enthalt eine Mischkammer (4) zum Mischen des Reduktionsmittels (8) mit einem Gas (20), in die eine das Reduktionsmittel (8) fuhrende Reduktionsmittelleitung (6) sowie eine das Gas (20) fuhrende Gasleitung (24) mundet. Gemas der Erfindung ist eine Steuereinrichtung (44) zur Steuerung des Reduktionsmitteldurchsatzes in der Reduktionsmittelleitung (6) in Abhangigkeit vom Gasdruck (pg) in der Gasleitung (24).

Einrichtung zum Einbringen eines flüssigen Reduktionsmittels in eine Abgas-Reinigungsanlage

Ammonia gas is introduced by means of a feeding device into the flue gas duct of a large boiler, for example of a power station, having a flow cross-section of at least 3 m , into the flue gas stream flowing through the flue gas duct at a flow velocity of 10 to 30 m/s for a subsequent reduction, in particular a selective catalytic reduction, of the nitrogen oxides contained in the flue gas to nitrogen and water at a temperature of 300 to 450 DEG C. Hitherto, an ammonia/air mixture has been introduced through nozzles distributed over the cross-section of the flue gas duct at about the flow velocity of the flue gas, a distribution grid being provided downstream thereof, if desired. In order to effect the ammonia feed with higher operational reliability and lower energy consumption and to achieve a perfect and more complete mixing over a comparatively short mixing length, it is provided that the feeding device has jet pipes 7, ending in the direction of the flue gas flow in the flue gas duct 1, for feeding flue gas under pressure at a rate of 1 to 5 % by volume of the flue gas stream and at a flow velocity of at least 80 m/s at the jet pipe end, the jet pipes being connected to a flue gas compressor (2) which draws the flue gas from the flue gas duct via a flue gas branch line (3) and draws the ammonia gas.

Flue gas duct for large boilers with a device for feeding ammonia into the flue gas stream

The system has an insulation layer that is provided as a perforated hard foam insulation plate (1). Heat flow is accelerated towards a wall accumulator that is provided as a high loaded solar thermal detector. The insulation plate consists of rigid polystyrene foam and polystyrene, and a cell structure consists of resin hard foam. The thickness of the insulation layer is equal to that of the insulation valve of the plate, and hole density corresponds from 5 percentage to 15 percentage of the flat surface. The insulation layer is permeable to air without skewed punch hole.

Solar thermal insulation composite system for use in building, has insulation layer provided as perforated hard foam insulation plate, and wall accumulator provided as thermal detector, where heat flow is accelerated towards accumulator

Formulation (I), for allergen-free inner wall paints (preferably allergen-free silicate- or dispersion paints), comprises allergen-free room paint micro-hollow pellets (preferably glass or ceramic hollow pellets) in a volume of 5-70 (preferably 35-65)%. An independent claim is also included for wall paint, for allergen-free wall paint (preferably silicate-, dispersion paints or mineral wall paint system), comprising allergen-controlled inner room paint micro-hollow granules (preferably glass- or ceramic-hollow pellets) in a volume of 5-70 (preferably 35-55)%.

Formulation, useful for allergen-free wall paints (e.g. allergen-free silicate- or dispersion paints) and coating armor and artifact, comprises allergen-free room paint micro-hollow pellets

Schuster Lothar

Papers

Flue gas duct for large boilers with a device for feeding ammonia into the flue gas stream

Solar thermal insulation composite system for use in building, has insulation layer provided as perforated hard foam insulation plate, and wall accumulator provided as thermal detector, where heat flow is accelerated towards accumulator

Formulation, useful for allergen-free wall paints (e.g. allergen-free silicate- or dispersion paints) and coating armor and artifact, comprises allergen-free room paint micro-hollow pellets