Abstract: The energy contained in the blast furnace gas of a shaft furnace, particularly in the blast furnace gas of a cupola furnace, is utilized by wet cleaning the blast furnace waste gas as it emerges from the shaft furnace. The pre-treated blast furnace gas is then fed to a fine-dust filter for purification. Blast furnace gas entering the fine-dust filter is heated to the dew point by mixing it with a partial flow of purified gas branched off and heated upon exiting the fine-dust filter. Another portion of the purified gas mixture is fed to a gas turbine.

Abstract: A device for cleaning a bag filter, closed on one side, is arranged on a supporting grid within a housing traversed by the fluid to be cleaned and is provided on the clean-gas side with an injector which is directed into the inside of the fabric filter and is connected to a source of gas of higher pressure than the pressure of the fluid to be filtered. In order to develop the breaking up of the filter cake upon the cleaning of fabric filters in such a manner that as few components as possible of the filter cake are placed in suspended condition and therefore the greatest possible proportion of the filter cake can be removed as a coherent unit, it is proposed that on the clean-gas side (14) of the supporting grid (2a) there be arranged a bag (3) which is expandable by gas pressure, the bag (3) be attached in pressure-tight manner to the injector (10) and the bag (3) be so dimensioned that its circumference corresponds at least to the inside circumference of the supporting grid (2a).

Abstract: A plant for the processing of exhaust gases of an electric melting furnace for steel is disclosed, which allows to improve the cleaning of heavy-metal-containing exhaust gases from electric arc furnaces for steel production from scrap, which allows to decrease the energy use for capturing waste from the exhaust gases, which avoids the odor molestation by the waste gases generated in connection with an electric melt furnace operation during the preheating and for making useful the exhaust gases for the smelting under incorporation of the drying of oil-containing roll sinter muds, where simultaneously the oil-content of these roll sinter muds is used for saving of electric arc melting energy.

Abstract: Disclosed is a method and apparatus for calibrating and recalibrating a photometric measurement instrument which supervises the presence of dust in a particular location as produced by a process during which dust is developed on an irregular basis. The method is characterized in that the calibration is initiated upon the detection of a condition in which dust concentration is expected to be low. In a steel-making process, such a condition occurs upon termination of the blowing phase of a converter. In the case of smoke in a flue, such a condition occurs when there is an absence of gas flow in the flue.

Abstract: The dust removal plant is comprised of a fan with adjustable guide vanes and a ring gap scrubber with adjustable gap width. A first feedback loop controls the scrubber operation through gap width control for maintaining a constant residual dust content of the gas as discharged, a second feedback loop keeps the pressure constant at the scrubber intake by adjusting the guide vanes. Both feedback loops reduce the power consumption of the fan for periods of low dust development. The apparatus is explained with reference to cleaning of smoke gas discharged from a blowing steel converter.