DK145984B - DEVICE FOR REMOVAL OF SOLID AND / OR GASIC COMPONENTS IN A GAS MEDIUM FLOW - Google Patents

Description

145984

The invention relates to an apparatus for removing solid and / or gaseous components in a gaseous medium stream, which apparatus comprises a cyclone separator for separating coarser solid components from the medium stream, and in which apparatus the finer solid components 5 and / or the gaseous components are excreted by means. of wet washing, the apparatus comprising a wet-washing device disposed within the central tube of the cyclone separator.

The gas stream often contains large amounts of solids and in addition, for example, sulfur dioxide or other gaseous components which are harmful to the environment or which one wishes to extract from the medium stream.

Coarse solid components can be easily separated, for example, in cyclone separators, which are found in a large number of different embodiments. Some cyclone separators have a very large separation effect, but not even these are able to separate gaseous components.

Thus, in the case of gaseous components, wet washing is often the only possible way of separating the components from the medium stream. Wet washing devices often do not tolerate large loads of solids, and on the other hand, the solids can be valuable, but only in the dry state. Because of this, wet washing 20 alone is not always the best possible way of cleaning gas streams.

Therefore, when separating certain components from a medium stream in a separation plant, the combination of cyclone separation and a subsequent wet-washing is often carried out, each separation step taking place in a separate device. Thus, such a solution has 25 very large dimensions, and in addition, it consumes a large amount of energy, with each loss of pressure being pressure loss. The previously known plants also have other weaknesses. These include gas leakage, wear on the plant, and difficulties arising from the temperature of the gas stream.

30 However, attempts have been made to eliminate the disadvantages associated with the combination of a separate cyclone separator and a separate wet-washing device. Currently, dry filters are generally used especially for mechanical dust extraction. In such dry filters, both the coarse and the fine solid components can be passed to a separation unit by a suitable design solution. However, in dry filters it is impossible to separate gaseous components from the medium stream. For this reason, in the case of gaseous components, dry filters must also be used for separate wet washing.

In the invention there has been provided an apparatus of the kind mentioned above, by means of which a solid stream and gaseous components can be removed from a medium stream in a more efficient way than before, at the same time as the apparatus has small dimensions and requires only a little energy.

The apparatus according to the invention is characterized in that a collecting funnel with a pipe extending out of the cyclone separator is arranged below the central pipe so that the sludge formed by the finer solid components and / or gaseous secreted inside the central pipe by wet washing. components can run down the collection funnel and out through the pipe.

In the apparatus according to the invention, the coarse solid components separated by the medium stream can be taken out in a dry state, while the sludge containing the washed out finer solid components and / or gaseous components can be taken out through the pipe connected to the collection funnel. and since in the apparatus according to the invention there is only a slight loss of pressure, the energy consumption becomes low. Finally, in the apparatus according to the invention, any corrosion problems can be relatively easily addressed if the components separated by wet washing are corrosive, since then only need to use corrosion-resistant materials for the production of the central pipe and the collection funnel, since the sludge which causes the corrosion does not enter. contact the other parts of the appliance.

The invention will be described in more detail below with reference to the drawing which shows a preferred embodiment of the apparatus according to the invention.

3 145984

The embodiment of the apparatus shown in the drawing has a per se known cyclone separator 10 with an inlet opening 12 for a gaseous medium stream 11, a central pipe 16 and an outlet opening 14 for the purified medium stream 13. The cyclone separator 10 has a cone-shaped 5 lower part 15. The cyclone separator 10 may of course also be of another type known per se cyclone separator. The incoming medium stream 11 impinges on a rotating, downward centrifugal movement around the central tube 16, whereby the coarser solid components are directed toward the outer periphery of the rotating medium stream, 10 settles on the cylinder wall of the cyclone 10, further descends into the cone-shaped lower portion 15 and is collected at its bottom. The bottom 15 of the cone-shaped portion 15 of the cyclone separator 10 may be provided with a suitable emptying device 22 through which the separated dry stream 23 of solids is collected.

However, the finer solid components and the gaseous components of the medium stream 11 remain at the inner periphery of the rotating medium stream and are introduced into the downwardly open central pipe of the cyclone separator 10. Washing liquid (not shown) is advantageously fed into the central pipe 16 in such a way that inside the central pipe a substantially liquid jet of liquid is formed in the substantially substantially horizontal direction, whereby the medium stream flowing into the central pipe 16 is subjected to a thorough washing, so that the fine solid particles and the gas components are moistened and sink down along the walls of the central pipe 16 sludge. The wet-wetting device 25 disposed within the central tube 16 of the cyclone separator 10 may with respect to construction, for example, correspond to the construction described in the applicant's Danish patent application No. 3706/76, on the same shaft for a rotating unit, consisting of a spreading vane, a blower drop separator, a connecting pipe. and a blowout fan. This construction is schematically indicated as block 17. In such a drawing, a very efficient droplet separation is obtained, so that the output stream 13 is purified for both the fine solid components and for the gas components and dried so that it does not contain washing liquid.

In order that the sludge from the central pipe 16 should not be mixed with the dry solid material collected in the cone-shaped lower part 15 of the separator 10, a collecting funnel 18 is arranged beneath the central pipe 16 and substantially coaxially with this. in which said sludge runs. The collecting funnel 18 has a cone-shaped portion 19 and a tubular portion 20 leading out of the cyclone separator 10.

Thereby, the sludge separated by the wet washing can be removed as a separate outflow 21. The collecting hopper 18 is advantageously arranged so that the distance h between the central pipe 16 and the hopper can be adjusted. Advantageously, the diameter of the collection funnel 18 is slightly larger than the diameter of the central tube 16, but the diameters may also be equal to 10 or the diameter of the collection funnel may be smaller than the diameter of the central tube 16, with the slurry in the free space between the central tube 16 and the collection funnel 18 directed against the center portion of the collection funnel 18. of the medium flow directed in the central tube, thereby compressing the sludge flow and preventing it from spreading to the cylinder walls of the cyclone-15 separator 10. The collecting hopper 18 is advantageously supported by support means 24 which abut the conical shaped lower part of the cyclone separator 10. The hopper 18 can of course also be otherwise supported within the cyclone separator 10.

By means of the apparatus according to the invention, inside the cyclone separator 10, a dry medium can be separated from both the dry solid material and the sludge-separated sludge in the form of independent separate outlets, respectively 23 and 21, without the need to use separate devices. to the dry and wet secretions. In the apparatus according to the invention no significant pressure losses occur as those which generally occur in connection with separate dry and wet separation.

Furthermore, in the apparatus according to the invention, the corrosion problems can be taken into account in a simple manner in the case that the components separated by the wet wash cause corrosion in the separating unit. In the system according to the invention, it is only necessary to use corrosion-resistant materials in the centrifuge 16 and the collection funnel 18, since the sludge which causes corrosion does not come into contact with the other parts of the apparatus.

The wetting of the medium flow within the central tube can be solved in a variety of ways, and the distance between the central tube and the collection funnel