DK141971B - COMBINED MIXTURE DRY AND HEATING PLANT FOR PREPARING BITUMINOEST MIXTURE GOODS - Google Patents

Description

(Jjl OD PUBLICATION MANUAL 141971

DENMARK ln, cl · 3 'I

(21) Application No 97/72 (22) Filed on 10 Jan. 1972 raral (23) Life Day 10 Jan 1972 (44) The application presented and the presentation document published on 28 July. 198Ο

DIRECTORATE OF

PATENT AND TRADEMARK (3 °) Priority beaker * from it

Jan 19 1971, 2102328, DE

01) WIBAU WESTDEUTSCHE INDUSTRIE- UND STRASSENBAUMASCHINEN-GESELLSGHAFT

H.B.H., 6461 Rotheribergen, DE.

(72) Inventor: Karl-Heinz Koenitzer, Barb aro b s as tr. 9s 6461 Rothenbergen, DE: Paul Munderich, Frankfurter Str. 84, 6461 Rothenbergen, DE.

(74) Plenipotentiary in the proceedings:

Civil Engineering M.Gregersen.

(64) Combined mixing, drying and heating systems for the preparation of bituminous mixing goods.

The invention relates to a combined mixing, drying and heating system for the preparation of bituminous mixing goods of the kind set out in the preamble of claim 1.

At known plants of this kind, at which bituminous. 5 mixing goods can be prepared in a combined drying, heating and mixing plant, provided that the mineral substances are first dried, then heated, then added with the bi-tuminous binder and finally wrapped by it, as is for example. known from the descriptions of Norwegian Patent No. 40,232,10 and US Patent No. 1,836,754.

In order to carry out this process, it is a prerequisite that some residual water be present during the mixing process. The water content is crucial as it ensures a coarse fine particle bonding until the binder droplets are dissipated by the subsequent heating to a film which takes over the function of the water, namely the dust binding. The known conventional working plants cannot ensure the presence of water, since the actual introduction area for the minerals is already provided with devices that loosen and mix the substances, causing a heat transfer to them. Moreover, it cannot be overlooked that this detachment, especially when using an inclined grate, can cause a separation of the fine-grained material so that dust-free processing becomes practically impossible.

Also, the usual design of such countermeasures with ro-15 fired fires must be considered defective as the material already covered by binder is subjected to a strong rise in temperature which is not without influence on the quality of the binder. that is, the binder film, upon loss of the low boiling ingredients, is cured to some extent.

The invention aims to provide a plant of the kind in which the above-mentioned disadvantages are avoided, and this is achieved according to the invention in that the plant is designed as defined in the characterizing part of claim 1.

In this embodiment, it is obtained that the mineral substances in the feed area do not absorb virtually any heat, since the non-rotating goods are exposed only to radiant heat. In the actual mixing region, in which the heating flame is already extinguished, heat, as opposed to the feed ring area, is supplied by rolling the amount of goods with subsequent effect on the surfaces of the grains, thereby effecting an inlet for heat transfer together with a first attachment. of binder, preferably in droplet form.

With the continued feeding of the goods, this enters the drying, wrapping and heating area, whereby the full effect of the convection heat occurs. In this way, virtually complete expulsion of surface and pore water also occurs from the binder, which now completely surrounds the mineral particles. This area is determined in terms of its length so that the mixing property at the transition to the evaporation and discharge area has reached the required temperature.

In the evaporation area, a mixing of the mixture goods is avoided, which is only stirred to such an extent as to cause a release of vapor particles which may still be adhered to the goods.

In order to obtain as even distribution as possible of the droplet-injected binder on the mineral property in the mixing region, it is advantageous for the plant to be designed as indicated in the characterizing part of claim 2. The binder is thereby substantially dispensed in the center of rotation or in the reversal line of the relapsing mineral and is thereby evenly distributed.

For continuous preparation, it has proved to be useful that the plant is designed as disclosed in the characterizing part of claim 3. The control of the binder supply in dependence on the amount of weight applied is by means of known control elements.

In some cases it may be advantageous for the mixing region to be outside the rotary tube or its heated part, but in fixed connection with the rotary tube. This can be done, for example, by extending the burner.

The invention is explained in greater detail by reference to the drawing, in which FIG. 1 is a longitudinal section through an embodiment of the combined mixing, drying and heating system; and FIG. 2 is a cross-section through the mixing region. 1 denotes A an insertion area for mineral substances and an outer burning area · for the flames, B a mixing area for the minerals and bituminous binder, C a drying, wrapping and heating area and D. an evaporation and discharge area.

In a known manner, a rotary tube 1 is provided with runner rings 3, 35 carried by runner rolls 2 in a frame 4, which also hardens a drive 6 with a chain pull 5, a fixed front wall 7 and an equally fixed rear wall 8, which is designed as waste gas drain. . Complete-

Claims (3)

4 141971 the wall is an oil burner not shown, a tape weight 9 for continuous supply and dosing of solids, and a dosing mechanism 10 for the binder led to the rotary tube. Transport of minerals and of the bituminous mixture 5 is marked by arrows 11 and 12 and one between these running line 13. Thus, the minerals enter the band weight 9 into the insertion area A and are advanced by a feed screw 14 to the mixing region B without being released. In the mixing region B, the goods are included by radial angular elements 15 from the bottom 10 of the rotary tube upwards about 90 ° and descends with a spread of about 45 ° from a vertical line. In this area, the minerals are coated with a binder layer. At the exit of the mixing region B, the mineral and binder mass is distributed approximately evenly over the pipe cross section by means of gutter-like rails 16 and dried and heated, with the final inclusion of the minerals in the binder so that the mixture at the exit from the area C can be considered to be bituminous. material mixture. This optionally requires evaporation or gasification in the discharge area D. This is 20 "equipped with radially directed steel steel fasteners 17, which cause intensive stirring without mixing the goods. The discharge is carried out automatically by means of the rear penetrating goods and the discharged goods are received by a drain shaft 8 as it leaves in the direction of an arrow 12. 25. The supply of hot gases occurs through the oil and air inlets indicated by arrows 18 and 19, while an arrow 20 indicates the path of the waste gases. The supply of binder is indicated by an arrow 21 and the binder passes through the metering mechanism 10, the conduit 22 and the spray nozzles 23. 30. cross section through the mixing region of the rotary tube of FIG. 2, the particularly effective arrangement of the nozzles is shown in an inclined position. 1. Mixing, drying and heating systems as a construction unit for the continuous preparation of bituminous mixture goods according to a process in which minerals