DE8619568U1 - Drying device for bulk goods - Google Patents

Description

Et te Il flit * * ί 4

έ (c rti t t 9e

STRONG

T gg

Moerser Strasse 140 D-4.150 Kfefeld 1 «B ¹ (02151) 28222 U, 20469 BSI 8 53

ti t ti ί *

PATENT ADVOCATE

Hans Pesch GmbH & Co. KG, Industriestraße 2, 4154 Tonisvorst

Drying device for bulk goods

The invention relates to a drying device for bulk material with a rotating drum in which the heated Contact surfaces are arranged from pipes, soft from a circulated, in a boiler heated heating medium are flowed through, with a Naßgutaufgabe at one end and with a Trockengutaustrag at the other end of the rotating drum.

Drying devices of this type are among others in the chipboard industry * the chemical industry, used in the feed and food industries.

It is known to differentiate bulk goods Drying method. On the one hand, bulk goods are made in the contact drying process as in a gatturigsge

tVätsche Bank AG Krefeld »3/1525 BLZ 32076000 * - .. Bpitkasse'Kreiad ¹ ?) 372? .eLZ 32050000 - Poetsche * Eeaen 4055-431 BLZ3eOK» 43

PATENTANWALT DR, STARK .-, MOERSER STR _it 1 / ta ■ D-4t50 KBEFELD · 'S »(02151) 28222 U, 20469 · (H 853578

UM IIM · ■ · I * f- *

2 =

measured drying device dried. For this purpose, the bulk material to be dried is brought into contact with a heating surface so that the water enclosed in the bulk material can evaporate. The contact surfaces, mostly pipes or pipe-like internals of the rotating drum, are _{heated by HsiSwasser s} steam or thermal oil, the heating medium supplied at a temperature of 200 to 300 ° C. and after cooling by around 10 to 100 ° C. in the circuit is returned to the boiler. The bulk material is gently dried in the contact drying process. However, the efficiency is only good at the beginning of the drying process. After the items to be dried have dried to around 40% moisture, the efficiency drops sharply. For this reason, drying devices that work according to the contact drying process are very space-consuming and relatively expensive.

In addition, it is also known to dry bulk goods using the convection drying process to dry. The bulk material to be dried is fed into a rotating drum, which is traversed by a hot gas. The hot gas enters at a temperature of 400 to 600 ° C. the rotary drum and dries the material, which is conveyed upwards by drivers of the rotary drum and trickles down through the stream of hot gas. The disadvantage of the convection drying process is the high dust content of the hot gas emerging from the rotating drum and the risk of fires or explosions arise in the area of the rotating drum.

In both of the procedures described there is also a relatively high expenditure of energy is required.

DR, STARK u MOEBSER SXR-.140 * 'D-4.1S0 KREFELD -' S »(02151) 28222 U, 20469 ■ M 8535? 8

• ■ • t ····

The object of the invention is * the space requirement and the To reduce energy expenditure for a drying device.

In the case of a drying device of the type described at the outset, this object is achieved in that that the rotary drum only has one to the Naßgutaufgäbe subsequent partial length with heated contact surfaces is equipped that the rotary drum is designed over its remaining length as a convection dryer and to this on inner drum circumference has driver for the bulk material and a hot gas flows through it, which is heated using the energy of the boiler, with the output of the rotating drum a collector for the dry material with the dry material discharge and at least one deduster connects the is connected to the rotary drum via a vapor return line.

With this drying device, the Well dried first in a gentle way in the contact drying process and then in the convection drying process. This not only takes advantage of both methods and avoids their disadvantages but also more favorable conditions in terms of space requirements and energy consumption. For the subsequent convection drying is namely a significantly smaller amount of hot gas is required than with pure co-operative drying * The inlet temperatures of the hot gas can be kept lower so that the risks associated with high inlet temperatures are eliminated and the convection

PATENTANWALT DR. STARK, -, MOf-RSER QlR .. "WP, · D-4 ^ 50 KUEFELD · 'S ¹ (02151) 88222 n, 20469 · Qg] 853578

IfIf ·· ···

(tit t (((

the drying process is much more gentle. This is also associated with a lower amount of dust, so that the effort for the subsequent dedusting is reduced and the environmental pollution from exhaust air or wastewater from a wet dust extractor is reduced in size. By making efficient use of the energy generated in the boiler Energy on the one hand for heating the heating medium and on the other hand for heating the hot gas, both of which are circulated, there are also significant energy savings.

In general, it is sufficient if the rotary drum is used as a contact dryer over about 1/3 of its length and over the rest of its length is designed as a convection dryer. The rotating drum is in this first third then provided with tubes or tube bundles as contact dryers through which the heating medium flows. The discharge of the heating medium can be passed through a few pipes that extend up to the discharge end of the Rotary drum extend so that even in the area of the remaining length of the rotary drum still to a limited extent contact drying takes place.

The collector located at the discharge end of the rotating drum is expediently a collecting shaft with at the bottom of the shaft arranged discharge screw and in the upper shaft area arranged hot gas exhaust. The one promoted by the hot gas Most of the dry material falls into the collecting shaft and is only "partly" released by the hot gas taken away. A fan can be arranged in the hot gas outlet to support the hot gas flow.

• PATENTANWALT DR. STARKi ₁ MOEPSER ₁ STR ₁₄ -MD.- D-41iiO JiREFELD, "g» (02151) 28222 u, 20469 ■ [R] 853578

The relatively small amount of dust carried along by the hot gas is separated in the downstream deduster. For this purpose, several dedusters connected in series, in particular cyclone dedusters, can be provided so that the hot gas stream leaving the deduster or dedusters only contains about 50 mg / m ^{3 of} dust. Accordingly, it is possible to discharge part of the hot gas leaving the dust extractor through a chimney, for which purpose a branch line can branch off from the vapor return line to a chimney.

The vapor return line expediently opens into a hot gas line which extends through the contact drying area the rotary drum extends through and opens into the convection drying area. That has Advantage that essentially dry hot gas is supplied to the convection area, thereby drying is accelerated and improved. However, this does not exclude the possibility of the hot gas line in the contact drying area has at least one gas outlet, so that a smaller part of the hot gas is already in the contact drying area flows out and there contributes to the transport of the goods to be dried.

The following is a shown in the drawing Embodiment of the invention explained; show it:

Fig.l schematically a side view, partly in section, through a drying device,

Fig./ a plan view of the object according to Fig.l.

Il III I Il I

I I * I I

• 1.41 | * l I

t ι ι ι ι

PATENT ADVERTISER DR, STRONG. '"MÖRSER £ ffi. * \ W .. D * fi50 KffEFELD. 'S ¹ (02151) 28222 u, 20469, [Tx] 853578

• · C ■ ·

It · ■ <

■ I ff P

Belongs to the drying device shown a boiler 1 with burner 2 and expansion vessel 3 and a rotating drum 4 with wet material feed 5 on one End and dry material discharge 6 at the other end.

The heating medium, e.g. water, heated in the boiler 1 is turned into a coaxial with the rotary drum via a pump 7 4 arranged ürehdurchführung 8 and conveyed from there in a pipe system 9, which as a contact drying system is formed and is arranged in the first third of the rotary drum 4. From the pipe system 9 Only a few tubes 10 extend over the length of the rotary drum 4 to the discharge end, where again a rotary leadthrough 11 is arranged, via which the heating medium reaches a return line 12, which opens into the expansion vessel 3.

The exhaust gas from the boiler 1 reaches the rotary drum 4 via a hot gas line 13. It flows through the rotary drum 4, which then has drivers 14 on the inner drum circumference of the pipe system 9, which occupies about 1/3 the length of the rotary drum 4. The hot gas leaves the rotating drum 4 together with the material to be dried at the discharge end. The discharge end of the rotary drum 4 opens into a collecting shaft 15, at the bottom of which a discharge screw 16 is arranged and which merges into a hot gas exhaust 17 at the top. A fan 18 is arranged in the hot gas vent 17, which blows the hot gas through a series of cyclone dedusters _; 19 presses. A collecting line goes from the cyclone dedusters 19

1 * I * I H MH H i

I »*« 4 ♦ * t I t

PATENT ADVERTISER DR, STARK. iMOSRSER SW. «140 ·· D-4J«) KREFELD * ^ (02151) 28222 u, 20469. [g] 853578

\ 20 eius, which are divided into a chimney pipe 21 and a

\ Vapor return line 22 divides. The vapor return line

22 opens into the hot gas line 13.

\ The drying device shown works like

follows: In the boiler 1 water is heated and from the pump 7 in the circuit through the pipe system 9, the Pipes 10 and the return line 12 to the Dehiui, g «vessel

3 promoted, from which it is returned to boiler 1. At the same time, what is generated in boiler 1 is generated Exhaust gas through the hot gas line 13 and the rotating drum

4 sent, under the action of the fan 18, which draws off the hot gas via the collector 15 and via the cyclone deduster 19, the collecting line 20 and the vapor return line 22 back into the

. Hot gas line 13 pushes, the rotary drum 4 is over

\ abandoned the wet goods task 5 bulk material to be dried.

This first reaches the Kontakttrocknungsbere ^ ch \ of the pipe system 9, where there is a residual moisture

is dried from 40 to 50%. The material is then dried by convection in the remaining area of the rotary drum 4 in which the drivers 14 are located. There, the material to be dried is picked up by the drivers 14 and trickles through the hot gas stream, which finally conveys the material to be dried to the collector 15, where the dried material falls down and is discharged by the discharge screw 16. The drying of the material takes place gently and without significant dust pollution of the hot gas flow, so that it can be cleaned ^{in the cyclone dust extractor 19 to a residual content of about 50 mg / m 3 of dust.} Accordingly, it is possible to discharge some of the gases through a chimney. The remaining gases are fed back into the circuit *

PATENT ADVERTISER OR, STÄRK ^ MÖRSER fTR ^ WJ. ' D-4150 ^ EFELD <<g '(02161) 28222 U, 20469 * fH «53578

I C (I

I re ti

* r (ti

M ti

In an embodiment not shown, a hot gas line extends from the boiler 1 through the Contact drying area with the pipe system and opens into the convection flow area, so that this always is supplied with dry hot gas. Some of the hot gases can already flow out in the contact drying area and take over transport functions there.

Claims (8)

, Oiling. · ΦΑ ^ Ύ & Ή STAR K III «ύ 'ι, 1 Il ■ r» Γ «PATENTANWALT Moerser Straße 140 D-4150 Krefeld 1' S" (02151) 28222 and 20469 CH 8 53 578 claims 1. Drying device for bulk goods with a rotating drum, in the heated contact surfaces made of pipes are arranged, which of a circulated, heated in a boiler heating medium are flowed through, with a Naßgutaufgabe at one end and with a Trockengutaustrag at the other End of the rotary drum, characterized in that the rotary drum (4) only has one to the wet material feed (5) subsequent partial length is equipped with heated contact surfaces (9) that the rotary drum (4) is designed as a convection dryer over its remaining length and on the inner drum circumference Has driver (14) for the bulk material and is flowed through by a hot gas, which under Using the energy of the boiler (1) is heated, with the output of the rotary drum (4) a The collector (6) for the dry material is connected to the dry material discharge (16) and at least one deduster (19), which is connected to the rotating drum (4) via a vapor return line (2Z). 2. Drying device according to claim 1, characterized • tit Mt Bank AG KreieW 103/1525 BLZ 32Ο7Θ0ΘΘ '< _t , «paikasf ©«' KfefeW3037E?, DLZ 32050000 · Poetecheck Eeeen 4055-431 BLZ 30010043 PATENT ADVERTISER PR, STARK, -, MOERSER SfR,, 1.40 ,. D-4,1,50 IfljEFELD · 'S "(02151) 28222 u, 20469. Q £] 853578 IJ 1t 1 Mill ^ it &. Ϊ t ill)) 1 ■ 5- * ■ i II>1> 1 ' > 1 J it JI f> * characterized in that the rotary drum (4) over about 1/3 of its length as a contact dryer and over the The rest of its length is designed as a convection dryer. 3. Drying device according to claim 1 ode; 2, thereby characterized in that the collector (6) as a collecting shaft (15) with discharge screw arranged at the bottom of the shaft (16) and arranged in the upper chess area Heating gas exhaust (17) is. 4. Drying device according to one of the claims 1 to 3, characterized in that in the hot gas vent (17) a fan (18) is arranged. 5. Drying device according to one of the claims 1 to 4, characterized by several in a row switched dust extractors, in particular cyclone dust extractors (19). 6. Trockunjseinrichtung according to any one of claims 1 to 5, characterized in that of the vapor return line (22) a branch line (21) leads to a chimney. 7. Drying device according to one of the claims 1 to 5, characterized in that the vapor return line (22) opens into a hot gas line (13) which extends through the contact drying area the rotary drum (4) extends through and opens into the convection drying area. * i tt i ti HM it ti * · # Iitt I t It * * «· * Ι * ■ ii *» ti it PATENT ADVERTISER DR ₁ STARK, ·, MO £ RSER? Τ ° '«1 ^' Oj \ 50 IjtHEFELD« 'S »(02151) 28222 U, 20469> (E) 853578 * f r t ff r (ff ι ι ι (t ctiii (t t t t (j c i, t ί ι • <t (ο ccti ItIIt (Ct CC I) t | [, 8. drying device according to claim 7, characterized in that the hot gas line (13) in the Contact drying area has at least one gas outlet.