US1718190A - Drying system for use with annular kilns - Google Patents

Description

June 18, 1929. o. BUscH DRYING SYSTEM FOR USE WITH ANNULAR KILNS Filed May 14, 1927 8 Sheets-Sheet FIG.1

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June 18, 1929. o. BUSCH DRYING SYSTEM FOR USE WITH ANNUL/AR KILNS Filed May 14, 1927 8 Sheets-Sheet 8 ld 97m JJ r 20 j Patented June 13, 1929.

OTTO BUSCH, OF LIEBERTWOLKWITZ, GERMANY.`

DRYING SYSTEMEEOR-USE WITH .A1.\`|'l\T12TLARICELNSV Application filed `May 14, 1927, Ser'al No. 191,472, and in Germany September 21` 1326.l

This invention relates to a drying system for use with annular kilns in the production of ceramic and similar goods, and the invention consists in the provision of a plurality of .parallel drying chambers arranged at opposite sides of the kiln and two series of lues carried across said chambers one above and the other underneath the same, means being` provided for supplying combustion gases and hot air .from the kiln to said iiues lior indirect and direct heating of the chamn hers as well as for returning moist air from the chambers to the fines for admiXture with the dry hot air in the latter for a regulation of the temperature.

It should be observed that the employment of tlues carried across heating chambers for distributing -gases and hot air in the latter is already known.

F igfl` of the accompanying drawings represents a horizontal part section of the system taken on the line I-l oi Fig. 4,

Fig. 2, another horizontal section on the line H-II of Fig. 3,

. Fig. 3, a vertical section on a larger scale taken on the line III-III of Fig. 2,

Fig. 4, a vertical section on the line IV*IV of Fig. 2, p

Fig. 5, a vertical section on the line V-V of Fig. 2,

Fig. 6, a vertical section on the line VI-VI of Fig. 2,

Fig.'7, a vertical section taken onthe line VII-VII of Fig. 1, and

Fig. 8, a! vertical section on the line VH1-VH1 of Fig. 1.

Figs. 9 to 12 incl. are diagrammatic illustrations of the circulation of the drying medium.

The drying system comprises two groups of parallel drying chambers 41 arranged at opposite sides of an annular kiln. Carried transversely across these chambers, midway of their length, are two series of flues, one being arranged above and the other below the chambers as shown in Figs. 3 and 4 where the fines in the upper series are designated 21, 22 and 23, and those in the lower series 18, 19 and 20. Each chamber has at the bottom a longitudinal flue 27 (Figs. 5 and 6) which is separated from the chamber by a. domed corrugated metal cover 30. The iiues 27 communicate through apertures 25 with the flue 19 and through apertures 29 at the ends with fines 31, 32 and 33 (Fig. 2) and through the latter flues'with a chimney. At opposite sides of each flue 27 channels l37 and 38 are arranged which communicatethrough slits 39and 40 in the cover plates with the respective chamber and through apertures 24 and 26 with the lues 18 and 2O respectively. Above the flue 27 in each chamber there is a gilled-pipe 36 through which exhaust steam, it such is available, is led for the heating of the chambers.

At the top of each drying chamber 41 a chamber 43 (Figs. 5 and 6) is provided for the-collection of moist air. This collecting chamber is situated between a horizontal partition in which there are apertures 42 and an archedfroot in which there are slits 44. The slits 44 open into channels 46 and 48 which communicate through apertures 49 and 51 with the lues21 and 23 respectively (Fig. 6). Between these channels there is a channel 47 which communicates through slits 45 with the chamber 43 and through apertures 50 with the liue22 (F ig. 5) and throughthe latter with the discharge flue 33. Along the side walls ofthe chambers 43 there'are gutters 43 for the collection and discharge of water of condensation deposited on the walls. The

. slits 44 and 45 over the chambers 43, and the slits39 and 40 over the channels 37 and 38 are narrow in the neighbourhood of the transverse 'distributing lues and widen gradually away from the saine, as shown inFigs. 3 and 4, so as to ensure an equal distribution of the air and gases within the drying chambers.

Combustion gases from the kiln are drawn from the flues u and 4 by a fan 1 which delivers them through a flue 5 into the iiue 19, (Fig. 1). The hot air derived from the kiln by convection and radiation collects in a chamber 16 (Fig. 3) whence it is delivered at the opening ot al damper 17 into a pipe 7 which communicates through a pipe 6 with a fan 2 (Fig. 1). The latter feeds the `hot air through a iiue 8 whence it can be diverted by means of a flap valve 9 F ig. 8) either into the iiue2() or into the flue 23. The lues 18 and 21 discharge, Linder regulation by means of a damper 13, into a flue 12 which leads to a fan 3. The latter feeds into a flue 10 which com'- municates with a chimney 14 but which can also be connected over a damper 11 with the lues 8 and 20.

The intakes and outlets of the 'different fans are regulated by means of dampers 54. The apertures between. the lues and the dryilo ing chambers are itted with regulating dampers. Access to the lues and channels can be had through manholes 52 and 53.4

The modus operandi is as follows:

After filling the drying chambers with fresh material, a preliminary -drying is et tected by means olf combustion gases which are ted by the fan 1 through the flues 5, 19 and 27. rlhe moist air produced in the chambers is led oil' to the chimney through the flues 22 and 33, the dampers of the apertures 50 being adjusted according to the available draft. 1vlfater ot condensation deposited on the walls of the collecting chamber L13, is collecte-d by the gutters 43 and prevented from dripping back into the drying chamber.

lll/Then the preliminary drying has proceeded far enough to allow an increase in the temperature, the apertures v211 and 26 are opened. Het air from the tan 2 will then be supplied to the 'flue 20, and the moist air will be drawn oil by the tan 3 through the ' flues 18 and 12. rlfhe moist air is mainly discharged through the lue 10 and through the chimney 14, but part of the same may be delivered through the flue 23 back into the drying chamber for modifying the temperature, the apertures 51 being opened for this purpose. 'At a later stage, the apertures 49 are opened so that moist air will be led through the flue 21 to the tan 3. Part of this air is used for mixing with the hot air, as before, the remainder being discharged into the atmosphere, At the end of the drying process the hot flue gases from th-e kiln may be ed together with the hot air into the drying chambers, the discharge being through the lines 21 and 22. Moreover, exhaust steam, if available, is ted through the pipes 36.

By a suitable adjustment ot' the dampers air mixtures oft dirllerent kind and temperature may be led in this manner upwards or downwards through the drying chambers to suit the particular 'goods under treatment, and a very rapid and uniform drying will be effected while the available heat is utilized to its fullest advantage.

l claim:

1. The combination with an annular kiln oit a plurality oit parallel drying chambers yarrai'iged at opposite sides of the kiln, two series of lues carrie-d transversely across said chambers one above and the other below thc same, fans communicating with the different fines, and means for connecting said lues with one another and with the liln to allow combustion gases and hot air from the kiln to be used. for direct and indirect heating of the chambers and allow the moist air from the chambers to be returned to the lues for admixture with the fresh drying air.

2. rlhe structure claimed in claim 1, a chamber arranged between the kiln and one ol the Yfans lor collecting the hot air from the kiln, and means for connecting said latter fan with dillerent lues.

3. rlhe structure claimed in claim 1 and a flue carried along the bottom of each drying ychamber for indirect heating by means ol combustion gases, said latter flue being separated itrom the respective chamber by means ot domed, corrugated metal plate.

4. A drying system according to claim 1 wherein each drying chamber has an arched roof and a perforated partition forming together a chamber for the collection of moist air, and gutters carried along the sides of said ehamber ttor the collection and discharge of water of condensation.

5. The structure claimed in claim 1 and longitudinal channels through whiehthe drying chambers communicate with the lues, the communication between said channels and the chambers being effected through apertures the el'l'ective area of which is gradually widened in proportion to the distance out the apertures 'from the tlues so as to produce a uniform distribution et the admitted air and gases.

OTTO BUSCH.' Y

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