DE100287C - - Google Patents

Description

IMPERIAL

PATENT OFFICE

The present invention relates to drying devices, in which the to be dried Materials by contact with superheated steam in complete isolation the atmospheric luff should be dried, and the steam should be superheated and used for drying, which comes from the dry goods themselves. The latent heat of the evacuating water vapor should be caused by precipitation in heating registers set up separately from the drying device to be recovered.

The drying device consists of a completely sealed off from the atmospheric air , drying rooms heated consistently above the boiling temperature of the water, in which at some point the water vapor formed from the moist material is overheated and then brought into contact with the damp dry goods, so that it evaporates more water by giving off heat. Anywhere from the Closed drying rooms extracting pure water vapors are added to the heating register fed to a second completely independent drying device and condensed there.

This device has opposite the drying device protected by D. R. P. No. 77758, from which it emerged, the. great advantage that one can for all Materials completely pure and without the vapors extracted from the drying room Admixture of atmospheric air. In practice it has been shown that this is purer Steam condenses much more easily on contact with cooler metal walls than steam mixed with some air. By the complete elimination of the air, there are also the oxidations the metal condensation surfaces completely eliminated. With the help of the new facilities at hand, one can therefore use the Recovery of the heat used in drying more completely at a lower cost perform than was previously possible.

Compared to the facilities in which one superheated steam "from some special Used kettle or evaporator for drying, results in the application the great advantage of the present new drying device that one is independent can dry from other apparatus and the large amounts of steam which are used for Drying is required, does not need to generate. For evaporation of a specific Weight of water from the dry goods needs at least ten times the weight of strongly superheated steam. the end for this reason it was previously excluded at all for larger drying systems pure superheated steam instead of heated air to dry. With repeated Use of the steam coming from the dry material eliminates this problem and the drying facility becomes simpler in the plant.

If you lead superheated steam from an external steam source through the

materials to be dried, the steam escaping from the dry material is Quick-drying never be completely saturated, but still with a part of that warmth escape, which could have been used for drying. With the repeated Use of the same steam as required by the present new invention, this heat loss is almost completely avoided.

The essential characteristic of the new arrangement is to be found in the fact that one no steam is required for drying, but pure steam in the drying device generated, which for further drying purposes, for pre-drying or post-drying in separate Rooms, for preheating the fire gases or for any other technical purposes, which are not in direct contact with the drying system are used can.

In Fig. Ι the arrangement of such a drying device is given. It has to be done, however It should be expressly noted that the figure is intended to serve only as an illustration and as one of the many forms in which evaporation of the Moisture water through superheated water vapor and a precipitate of the withdrawing pure steam takes place in a separate condenser.

The figure shows an installation in which two drums have been arranged. In the drying room a, which with the adjoining rooms e I ik is completely sealed off from the atmospheric air, pure evaporation of the water contained in the dry material is brought about by the fact that the walls of these rooms are washed around by the heating gases from the fireplace η. In order to achieve a livelier evaporation, the water vapor is sucked out of the drum α and the space e through the exhaustor h and for the most part pressed through / to the heating pipes i. There the steam is overheated, returns to the drum through the pipe k and there it touches the moist surfaces of the items to be dried. The steam gives off its free heat, which has been absorbed in the superheater i , to evaporate the water and reaches e. So that the dry material does not come into contact with overheated metal walls and overheated metal walls are avoided at all, the flues of the furnace η are so directed that the fire gases first wash around the steam superheater i and then the actual drying room α. With this arrangement, the heat available in the heating gases is used most effectively at the same time. Only as much pure steam is passed through the pipe m to the heating register s of a second drying drum as new steam is generated in the drum α. Since the heating register s is bathed in fresh outside air, most of the steam condenses in it and, if it is not condensed, can exit through the exhaust pipe t , while the (condensed water flows out at ν . The supply and discharge of the drying material to the drum α takes place with complete air exclusion, which is secured by the slider <f, the filling hull b, the screw c on collapse and correspondingly by the slider y and the hull g in the event of failure.

The drum r is arranged in FIG. 1 in such a way that the material predried in α falls into the funnel q and is subsequently dried by a stream of warm air generated by the exhaustor u.

It should be remarked, that in the cases in which the dry material can withstand high temperatures, the steam superheater can i be omitted, and the superheating of the steam takes place by those Eisenfla'chen with which the dry material comes into direct contact.

Claims (2)

Patent Claims: 1. A drying system for drying any material using superheated steam to the exclusion of atmospheric air, characterized in that the for Drying, the steam used is taken from the material to be dried and is superheated before returning to the drying device. 2. A drying device characterized by claim ι, in which the as Steam superheater formed walls first and the actual drying room enclosing Walls are finally painted by the fire gases, for the purpose of glowing the metal walls and overheating of the material to be dried. For this purpose ι sheet of drawings.