Abstract: A process and device separate off a volatile component from the off-gases in cement clinker production. Raw materials for cement clinker production are passed through a preheater with heat exchange with the off-gases and are then burnt in a rotary kiln. Owing to the heating in the preheater, the volatile component bound in the raw materials is vaporized and separated off. A first raw material stream having a relatively high concentration of the volatile component is applied to a first line of the preheater and a second raw material stream having a lower concentration of the volatile component is applied to a second line. The volatile component is separated off from the first substream of the off-gases. The first raw material stream heated to a temperature of at least 250° C. with the first substream of the off gases in the first line is combined with the second raw material stream.

Abstract: A process and device separate off a volatile component from the off-gases in cement clinker production. Raw materials for cement clinker production are passed through a preheater with heat exchange with the off-gases and are then burnt in a rotary kiln. Owing to the heating in the preheater, the volatile component bound in the raw materials is vaporized and separated off. A first raw material stream having a relatively high concentration of the volatile component is applied to a first line of the preheater and a second raw material stream having a lower concentration of the volatile component is applied to a second line. The volatile component is separated off from the first substream of the off-gases. The first raw material stream heated to a temperature of at least 250° C. with the first substream of the off gases in the first line is combined with the second raw material stream.

Abstract: A process and an apparatus denox flue gases containing carbon monoxide and/or gaseous organic substances with at least one catalyst for catalytic reduction of the nitrogen oxide NOx and a heat exchanger for heating the flue gases from recovery of the residual heat of the denoxed flue gases before the catalytic reduction to a reaction temperature of 160° C. to 500° C. For the best possible denoxing of the flue gases with simultaneous minimization of the externally supplied energy needed, it is envisaged that the losses associated with the heat movement in the heat exchanger will be compensated for by providing at least one stage for regenerative post combustion of the carbon monoxide and/or of the gaseous organic substances.

Abstract: A bag filter assembly for cleaning dust-laden gases has a housing, which is divided into a filtered-gas side and an unfiltered-gas side by a bag bottom formed with openings. Several filter bags with a flat cross-section and support baskets are arranged in the bag bottom openings. The filter bags have support baskets and injector nozzle at the open end for conducting and accelerating compressed-air pulses for dedusting. The injector nozzle protrudes at least partially into the openings of the bag bottom. Sealing elements are arranged on the outside of the injector nozzle at the level of the bag bottom in order to form a defined gap for a defined compression of the filter bag between the sealing elements and the jacket surface of the opening in the bag bottom and thus to independently seal the filter bag with respect to the opening of the bag bottom.

Abstract: A method and a device remove mercury from exhaust gases during a production of cement clinker. The device contains a pre-heating stage, a feed point for raw materials required for the production of the cement clinker, a rotary kiln for burning the raw materials, a filter stage for removing dust from the exhaust gases conducted in the main flow, and a raw mix mill for partially mill drying the raw materials. A circuit for the mercury in the exhaust gases is formed between the pre-heating stage and the raw mix mill or the filter stage. To achieve good mercury removal at low cost, a sub-flow of 1 to 30 volume percent of the exhaust gases is branched off from the main flow of the exhaust gases having a temperature of at least 300° C. A separator and thereafter at least one stage for removing mercury are arranged in the sub-flow.

Abstract: A method and a device remove mercury from exhaust gases during a production of cement clinker. The device contains a pre-heating stage, a feed point for raw materials required for the production of the cement clinker, a rotary kiln for burning the raw materials, a filter stage for removing dust from the exhaust gases conducted in the main flow, and a raw mix mill for partially mill drying the raw materials. A circuit for the mercury in the exhaust gases is formed between the pre-heating stage and the raw mix mill or the filter stage. To achieve good mercury removal at low cost, a sub-flow of 1 to 30 volume percent of the exhaust gases is branched off from the main flow of the exhaust gases having a temperature of at least 300° C. A separator and thereafter at least one stage for removing mercury are arranged in the sub-flow.

Abstract: A bag filter assembly for cleaning dust-laden gases has a housing, which is divided into a filtered-gas side and an unfiltered-gas side by a bag bottom formed with openings. Several filter bags with a flat cross-section and support baskets are arranged in the bag bottom openings. The filter bags have support baskets and injector nozzle at the open end for conducting and accelerating compressed-air pulses for dedusting. The injector nozzle protrudes at least partially into the openings of the bag bottom. Sealing elements are arranged on the outside of the injector nozzle at the level of the bag bottom in order to form a defined gap for a defined compression of the filter bag between the sealing elements and the jacket surface of the opening in the bag bottom and thus to independently seal the filter bag with respect to the opening of the bag bottom.

Abstract: A process and an apparatus denox flue gases containing carbon monoxide and/or gaseous organic substances with at least one catalyst for catalytic reduction of the nitrogen oxide NOx and a heat exchanger for heating the flue gases from recovery of the residual heat of the denoxed flue gases before the catalytic reduction to a reaction temperature of 160° C. to 500° C. For the best possible denoxing of the flue gases with simultaneous minimization of the externally supplied energy needed, it is envisaged that the losses associated with the heat movement in the heat exchanger will be compensated for by providing at least one stage for regenerative post combustion of the carbon monoxide and/or of the gaseous organic substances.

Abstract: A bioscrubber for purifying dirty gas has a circulated scrubbing liquid which contains water and microorganisms for degradation of the substances to be separated off from the dirty gas. The gas enters at an inlet, moves through a mass-transfer zone, where it undergoes a phase change from the gas phase to the liquid phase, and the clean gas exits through an outlet. The system has a device for irrigating the mass-transfer zone with the scrubbing liquid, and a tank for collecting the scrubbing liquid and for activating the microorganisms. The bioscrubber has particularly high separation rates and particularly low risk of blockage because, in at least one mass-transfer zone of the bioscrubber, there may be provided a package of adjacent vertical tubes and a cleaning device for cleaning the tubes. A mass-transfer zone can be formed by a spray tower.

Abstract: A plant for purifying the flue gases from a furnace, in particular from a rotary cement kiln, has at least one selective reduction catalyst for reducing nitrogen oxides present in the flue gas, optionally introduction of a reducing agent and a dust filter or precipitation system. The dust precipitation system is formed by at least one first and one second filter apparatus. The reduction catalyst is arranged between the first and second filter apparatuses.

Abstract: The invention relates to a method for cleaning filters for dust-laden waste gases, including several filter elements (2) which are arranged vertically in a filter housing (1) and which have an upper open end (16) and a lower closed end (15) with at least one feed line (9) for the dust-laden waste gases and at least one discharge line (11) for the cleaned waste gases, in addition to a device for injecting surges of compressed air into the open end (16) of the filter elements (2). In order to reduce pressure fluctuations in the filter and to provide efficient cleaning with pulsations of compressed air in the low pressure range i.e. from approximately 0.8 to 3 bars, the filter is divided into several filter modules (1) respectively including at least one filter element (2). At least two filter modules (1) are arranged in a filter housing (10) or a filter chamber.

Abstract: A bag filter supporting cage member for a bag filter system, includes several longitudinal rods which are connected to mutually spaced-apart rings, wherein the rings have groove-like receiving depressions which are open towards the outer side, the longitudinal rods being received and held therein.

Abstract: The invention relates to a dust filter, with at least one dust filter sleeve (1), closed at the bottom end thereof, impinged on from the outside by the dust-containing gases, including at least one electrofilter (3), with at least one collecting electrode (4). According to the invention, the filter effect may be improved, by means of increasing the degree of dust separation, whereby the at least one emission electrode (2) is arranged behind the at least one collecting electrode (4), as viewed from the filter sleeve (1). The filter sleeve (1) and associated support cages (7) are preferably electrically isolated. During cleaning of the filter sleeves (1) the ionised dust particles (5) fall for the greater part on the directly adjacent collecting electrode (4).

Abstract: The invention relates to a method for cleaning filters for dust-laden waste gases, comprising several filter elements (2) which are arranged vertically in a filter housing (1) and which have an upper open end (16) and a lower closed end (15) with at least one feed line (9) for the dust-laden waste gases and at least one discharge line (11) for the cleaned waste gases, in addition to a device for injecting surges of compressed air into the open end (16) of the filter elements (2). In order to reduce pressure fluctuations in the filter and to provide efficient cleaning with pulsations of compressed air in the low pressure range i.e. from approximately 0.8 to 3 bars, the filter is divided into several filter modules (1) respectively comprising at least one filter element (2). At least two filter modules (1) are arranged in a filter housing (10) or a filter chamber.