Metallgesellschaft Aktiengesellschaft

Industrie-wert Beteiligungsgesellschaft Mbh

Ekkehard Weber

Heinz Holter

Heinrich Igelbuscher

Heinz Gresch

Karlheinz Arras

Reinhard Schulz

Kurt Hubner

The apparatus for dedusting a gas by electrostatic precipitation includes an advantageously steel housing and a plurality of discharge electrodes and collecting electrodes arranged in the housing. Each of the electrodes is made of a ceramic material and has an electrically conducting layer on at least one side thereof. The electrically conducting layer consists of a copper, nickel, bronze or iron-chromium-nickel alloy layer having a thickness of 0.1 to 2 mm. The ceramic material has a porosity of 25 to 90%, consists of fibers compacted with an inorganic binder and contains 30 to 70% by weight Al.sub.2 O.sub.3, 15 to 50% by weight SiO.sub.2 and 1 to 10% by weight of the inorganic binder. The discharge and collecting electrodes can be plates with a wall thickness of 5 to 100 mm. The discharge electrodes alternatively are tubular and have a wall thickness of 5 to 30 mm and a diameter of 30 to 100 mm.

Apparatus for dedusting a gas at high temperature

For the incineration of waste materials, a process is described, in which the waste materials are reduced in size as far as necessary and are subsequently optionally mixed with fuel and are incinerated at temperatures from 1000.degree. to 1700.degree. C. to form liquid ash, a major part of which is removed as liquid slag from the combustion chamber, and the pollutants are removed from the exhaust gases produced by the incineration. The process is characterized in that the pollutant-containing droplets of liquid ash which are suspended in the exhaust gas are separated at a temperature, which is close to the incineration temperature by at least one mass force separator and are subsequently either solidified alone or are combined with the liquid slag and solidified together with said slag.

Process of incinerating waste materials

A filter element is disclosed which serves to separate dusts from gases or air and consists of metals, alloys or plastics. The element is thin-walled and sheetlike, has a wall thickness of 0.05 to 2 mm and has a large number of regularly arranged holes, which have any of various shapes and sizes and have a non-circular cross-section and a hydraulic diameter of 0.01 to 1 mm. In that filter element the area which is occupied by the holes is 3 to 25% of the front surface area of the filter element.

Filter element for separating dusts from gases

Disclosed are a process and apparatus for separating liquid ash from an exhaust gas which is formed by the combustion of carbonaceous fuels. The exhaust gas is at a temperature of from 1200.degree. to 1800.degree. C. and under a pressure from 1 to 100 bars and has an ash content, consisting of liquid particles, of 0.1 to 60 g/sm.sup.3. In the process, the ash-containing exhaust gas leaving the combustion chamber is directed to a housing in which there is at least one baffle surface oriented substantially transversely to the direction of flow of the exhaust gas which may be preceded by a centrifugal separator and/or succeeded by a ceramic filter element.

Process and apparatus for separating liquid ash

A process is described for avoiding the formation of highly condensed aromatic hydrocarbons and dioxines in combustion systems, preferably in garbage incinerating systems, wherein the combustion exhaust gas are dedusted at temperatures from 300.degree. to 1000.degree. C. behind the furnace and wherein said process combustion exhaust gases are dedusted by means of a ceramic filter element which is made of SiO.sub.2 and/or Al.sub.2 O.sub.3 and/or ZrO.sub.2 and an inorganic binder and has a porosity of 50 to 90% and an apparatus for carrying out the process is also described.

Process for avoiding a formation of highly condensed aromatic

Described is a process in which the liquid ash is removed from a combustion gas which is produced by a combustion of coal with air under a pressure between 2 to 30 bars, wherein the combustion gas at a temperature between 1200.degree. and 1700.degree. C. is passed through at least one porous gas-permeable filter element which is disposed in the combustion chamber. The combustion is effected with a C:O.sub.2 mole ratio of 1:0.6 to 1:0.99 and the filter element consists of carbon; carbides of boron, silicon, titanium, zirconium or hafnium; nitrides of boron, silicon, titanium, zirconium or hafnium; borides of titanium, zirconium or hafnium; and/or oxides of aluminum, silicon, magnesium or zirconium.

Process of removing the ash from the gas produced by the combustion of

In an apparatus for cleaning hot gases a filter housing has an inlet for unfiltered gas and an outlet for filtered gas. A plurality of filtered inserts are placed within the housing in a manner capable of filtering undesirable components from the gas feed stream. Each filter insert is made of a fibrous filter material. Silicic-acid glass fibers have a silicic acid content of at least 90%. Coated upon the fibers and absorbed into their pores is a metal oxide of aluminum, titanium, zirconium, cromium, nickle or cobalt. A honeycombed cage filled with high temperature resistant perlite is located within the housing between the gas inlet and the fiber inserts. The cage has an inlet and outlet external to the housing for replacing the perlite. A combustion chamber mounted in the housing has a discharge nozzle located so that the nozzle is directed at the filter inserts. Combusting materials in the chamber causes an explosive backflow of gases through the filter inserts.

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Essen, Germany

Ekkehard Weber