POLLUTION CONTROL: DRY GAS SCRUBBING AND FILTRATION Certain applications of gas filtration, mostly related to thermal process systems (waste incineration, melting furnaces, etc.) contain also gaseous pollutants such as HCl, HF, SOx, dioxins, furans, etc.) which can be very dangerous for the environment. These hazardous gaseous pollutants have to be eliminated, together with the dust particles. To solve these problems, Ventilex developped a "Dry Gas Scrubbing and Filtration" process, based on the dry absorption of the gaseous components by a special selected absorbing agent (dry scrubbing product) which is injected in the gas stream in a special designed reactor, followed by a Jet bag fabric filter. Typical dry scrubbing absorbing products are: active coal, lime, sodium carbonate (Bicar), zeolithe or a combination of different of these products; Ventilex Benefits: Small energy consumption Very high filtration efficiency (solidsemission levels < 1 mg/Nm³) Dry handling and storage of the collected solid dust particles eventual validating of the collected dust (no waste water) Less maintenance For severe applications, such as: corrosive process conditions or environment, high humidity conditions combined with hygroscopic products, very fine dust particles (sub-micron), abrasive dust, high temperature, or a combination of different of these process parameters. Fluid bed sanddrying line How does the Ventilex Dry Scrubber work Hot gas cooling and filtration: When hot gas filtration is needed, the most economic and performing solution consists in first cooling down of the hot gas until a temperature which is compatible with standard filter fabrics and then filter the gas in a Jetbag fabric filter. This method offers different advantages compared to straight "hot" gas filtration, such as: smaller air volume after cooling (smaller system), standard economic filter fabrics can be used, smaller energy consumption and eventual energy recovery on gas cooler. The gas cooler has to be designed considering possible operating problems, such as dust settlement in the heat exchanger (automatic cleaning can be installed), abrasion by the dust, corrosion risk by condensation of acid gas components.

Hot process gas filtration (up to temperatures of 800°C). For some industrial processes it is necessary to filtrate the hot process gas, without cooling, for example to allow recycling of the gas in the process or energy saving reasons. For these special applications Ventilex uses a special Jet-bag filter design with heat resistant filter elements, made in stainless steel micro fibers (max. design temperature 800°C). Dry Scrubbing: Description of the process. The process is based on injecting a very fine powder reacting agent into the flue gas stream to be purified. The acid gaseous components...

Jetbag fabric filter - working principle. The JETBAG fabric filter is an automatic pulse jet cleaning filter, using vertical sleeves as filter elements. The filter has been designed for fine and light density dust, using a big clearance between the filter sleeves. The JETBAG is working under negative pressure (fan behind filter). The dust loaded gas is entering into the filter casing through a lateral inlet plenum with internal baffle plates. This plenum is working as a settling chamber for the bigger dust particles, and as a redistribution chamber for the dust loaded gas, at low velocity. The...

Imtech Ventilex Air Pollution control systems Ventilex started building air pollution control systems for the industry 50 years ago to cooperate with the fast growing needs of the environmental market. Very soon the experience and success of Ventilex in building air pollution control systems expended all over world, especially in the field of the industrial process related applications of flue gas filtration and dedusting. The air pollution control systems engineered and supplied by Imtech Ventilex are always using in-house designed filtration equipment. In this way, Ventilex is controlling the...