Abstract: Apparatus for catalytically reducing noxious substances in flue gas employes, in a first embodiment wherein combustion air is also pre-heated, a two-part heat-exchanger which is traversed from top to bottom by a plurality of catalytically active, separately movable heat-storage elements. Combustion gas is heated in a first portion of the heat-exchanger by heat transferred from the heat-storage elements and the noxious gases are catalytically reduced in a second portion of the heat-exchanger downstream from the first portion in the presence of ammonia and the heat-storage elements. The heat-storage elements can be removed from circulation and replaced by unspent or regenerated elements when the residual content of noxious substances in the flue gas remains elevated.

Abstract: An apparatus and process for catalytically reducing noxious substances in flue gas wherein a heat exchanger is traversed from a top section to a bottom section by a plurality of heat storage elements which are separately movable and are charged by the flue gas transversely to their direction of movement. At least a portion of the heat storage elements are provided with a catalyst coating. Flue gas cooled downstream of a desulfurization system is conducted through the bottom section of the heat exchanger where it is preheated by the heat storage elements and is then heated to a predetermined reaction temperature by an external heating means. Ammonia is added and the flue gas is conducted at least once through at least one middle section of the heat exchanger for the catalytic reduction of the noxious substances. Then, the flue gas is conducted through the top section of the heat exchanger so as to cool it to a predetermined chimney entrance temperature.

Abstract: An apparatus and a method of pre-heating combustion air and catalytically reducing noxious substances in flue gas employing a two-part heat-exchanger which is traversed from top to bottom by a plurality of catalytically active separately movable heat-storage elements are described. The combustion gas is heated in a first portion of the heat-exchanger by heat transferred from the heat-storage elements and the noxious gases are catalytically reduced in a second portion of the heat-exchanger downstream from the first portion in the path of the elements in the presence of ammonia and catalytically active heat-storage elements. The catalyst-coated heat-storage elements can be removed from circulation and replaced by unspent or regenerated elements when the residual content of noxious substances in the flue gas remains elevated.

Abstract: For the purification of air or gas streams the air or gas is conducted across a multi-zone adsorption apparatus through which a particulate filter material is moved downwardly by gravity. The gas stream is first admitted to the adsorption apparatus adjacent the downstream end to a first stage having an upstream and a downstream zone and, upon leaving the first stage, is divided into partial streams which are conducted back through an upstream adsorption material stage such that the gas from the most downstream filter material zone of the first stage which still has the highest contaminant content is admitted to and passed through the most upstream filter material zone of an upstream second stage of the apparatus and the upstream zone gas or air from the first stage is admitted to the downstream zone of the first stage in order to provide for high decontamination efficiency and for similar end decontamination of all the gas or air passed through the apparatus.

Abstract: A filter system is provided for purifying a gas stream by means of flowable or tricklable contact filter material, wherein the stream flows through the filter material and the filter material forms a movable bed. The system contains a filter chamber through which the filter material can flow and which is provided with an inlet opening and an outlet opening for the filter material between which the filter material is conveyed by gravity. The filter system includes deflection means for deflecting the stream, after a first passage of the stream through the filter bed to charge the filter bed for a first time, to a position above where the stream first passed through the filter bed and for conducting the stream at least once again transversely through the filter bed above the first charge so that the filter bed is charged a second time.

Abstract: In order to reliably and safely secure a flexible container, such as a glove, to an opening in a housing, which opening is surrounded by a tubular stud projecting outwardly from the housing, the stub is provided with at least two grooves in its interior wall, each groove having an omegoid cross-section, and the flexible container is clamped in each groove by a clamping ring having a circular cross-section corresponding to that of the central portion of the cross-section of its associated groove.