DE8707760U1 - Filter mat for flue gas detoxification - Google Patents

Description

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EDT Technik-Consult und Umweltsysteme GmbH ^: Private Institute for Environmental Protection

6300 Giessen
Filter mat for the smoke extractor

," The innovation concerns a filter mat for the flue gas

,' "* detoxification, consisting of a sponge-like, porous or cross-linked! base body with an active, dry substance connected to the surface of the base body.

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&kgr; It is known that smoke gas detoxification, especially the

:j Desorption or chemical adsorption (chemosorption)

T< ²⁰ with the aid of activated carbon, to which other active components, such as elemental sulphur, are added. It is evident that the flow and flow behaviour of the flue gases in the dry substances, but also the pouring behaviour of these substances themselves, in many cases do not allow optimum contact between the gases and the solid substances.

y The innovation therefore has the task of identifying known

&igr; ' Filter mats to be prepared in such a way that they are particularly suitable for

which are ideal for heavy metal detoxification with the help of elemental sulfur.

y. This task is solved with a filter mat for the

Flue gas degassing of the type mentioned above, in which the active, volatile substance consists of fine particles of pure, elemental sulphur, i> B ₁ ground sulphur bloom or sublimed sulphur, which

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each of which is bonded with a small part of its surface in an adhesive layer located on the GC and body,

The selection of the base body, whereby it is assumed that appropriate base bodies are known per se/ is subject to the criteria known to the expert. In particular, when selecting the base body, the temperature range of the application, the aggressiveness

iö of the gases occurring, the oxygen content and similar must be taken into account. The base body filter mats can consist, for example, of ceramic foams, of porous solids, of metal foams and wire mesh made of plastic foams, e.g. polyurethane foams and the like. Their consistency can be rigid, it can be slightly pressed in or very soft. Usually mats with a base area of 1 square meter and a thickness of around 10 mm are used. The pore density, measured in the usual measure of pore per inch = ppi, is for example between 10 - 60 ppi. It is essential that the entire outer and inner, accessible surface of the base body is covered with the adhesive layer and accordingly with the fine particles. The particles can be applied, for example, by dusting, sprinkling and then shaking, but also by sublimation from a sulfur vapor.

In addition to the sulfur particles, finely ground activated carbon or soot particles can also be bound in the adhesive layer. It cannot be ruled out that other inert or active particles, e.g. moisture adsorbents, are also embedded in the adhesive layer.

The thickness of the material, i.e. the thickness through which the flue gas to be decontaminated must penetrate, depends essentially on known criteria.

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It turns out that if the flue gas is permeable, pollination and feeding are also possible.

The activation principle of the filter mat differs from the usual method, in which the finely ground base substance is stirred into the adhesive mass itself and then attached to the base body by dipping it into the adhesive mass. This application method has the major disadvantage that the fine, active particles remain covered by the adhesive layer and thus result in a much smaller exchange zone between the flue gas and the particle itself. It is therefore important that only a small part of the surface is incorporated into the adhesive layer. A suitable sulfur powder is, for example, one that is defined as "sulfur powder" according to DAB (German Pharmacopoeia) No. 6.

Other suitable sulphur powders are, for example, "Grystex N" from EMW. The finely ground sulphur

] can be used in a ratio of 10 : 2

20 (sulphur to activated carbon) with finely ground activated carbon

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j mixed. For example,

Mowilith DM 122.

&igr; The figure shows an example. A coarse-pored

25 fabric with a porosity of 35 ppi, 10 mm thick, made of foamed polyurethane. The base plate is soaked with an adhesive; excess adhesive is squeezed off. The weight is now 638 g. The soaked foam was powdered and sprayed on both sides with finely ground sulfur in accordance with DAB 6 until the total mass is 1990 g. This means that 752 g of sulfur are in 1 square meter. The plate is dried until it is anhydrous. Unfixed or non-adhering sulfur and other particles are knocked off. Heavy metals, especially mercury-containing vapors, are passed through the substance and

! react with the exposed particles. Such

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Soundproofing plates can also be combined in groups in cassette filter housings and the like (not shown). The figure shows an enlarged view of the area of the pores with the adhesive layer and embedded particles of elemental sulfur.

Claims (3)

&igr;&igr;· m &Phi; r a r a · ·■ ft·« «4*»· te r»ro rs ■ Al Protection claims: 1. Filter mat for flue gas detoxification, consisting of a sponge-like, porous or cross-linked base body with an active dry substance bonded to the surface of the base body, characterized in that the substance consists of fine particles of pure sulfur, e.g. ground flower of sulfur or sublimated sulfur, each of which is bonded with a small part of its surface in an adhesive layer on the base body. j 2. Filter mat according to claim 1, characterized in ! 15 that in addition to sulphur particles, finely ground activated carbon or soot particles are bound in the adhesive layer s jnd. 3. Filter mat according to claim 1 or 2, characterized in that additionally other particles, e.g. Moisture absorbents are partially embedded in the adhesive layer. 25 30 35