DE1442732A1 - Heat exchanger for exchanging heat between a fine-grain material and a gas flow - Google Patents

Description

falter Isler, Aarau ( Switzerland)

"Heat exchanger for exchanging heat between one fine-grained material and a gas stream "

The invention "relates to a heat exchanger for Heat exchange between a fine-grained good and a Gas flow, especially for preheating, calcining and burning cement-liohmehl through kiln exhaust gases, which one otrör-iungsbewegung in the form of a vertebral senice issued and the fine-grain material to be brought into heat exchange with the gas is added in the vicinity of the "whirl core", so that 3 it is during the rotary movement with the gas against the radial component of the gas velocity with heat exchange is moved with the gas to the outside and then collected again, which leaves at least one has approximately circular cylindrical container, and this container with at least one opening on the outer circumference for the introduction of the gas into the container inflow channel designed with rotary movement and with a central outflow channel for the gas as well as inside, in the vicinity of the drainage channel with a feed device for the fine-

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granular (kit is equipped and. the container on the outside creates at least one outlet opening for the outside fine-grained G-ut possesses »

! 3s such a Tärmetaiiseiier is already known * see the French patent clirift "4 ^ 2. 594" the & Oer the 1-fe.cJit-eil shows y that a bottom from si dispenses it Αϊιβ pour eggs irestststif * - partilcel susaimien with the & as xiicnt Ea "Tsriiin

lys is further a Spiral ^ ir ^ belmischfeaDMer, to carry out chemisGlier reactions and physical rro ^ eäse 'with ei: iDi-i tangentia.len Strömuiigsmltteleinlaö and a central. Outlet in one. Sidewall on the Kamnieraohse known j see the German JLuslegesehrift 1 0o7 786 , whereby a. Wing protrudes axially into the interior of the chamber from a side wall and extends along the spiral vortex path in the Eamraer. This wing can force the direction of flow on the exiting gases, but it cannot accelerate the airborne particles, which will certainly prevent the outflow of the particles with the particles Öiöriolis-Erafte taking place 3ntlan ^. The solid "· particles on the wing jürosioh out"

Furthermore, a FliehlEraft dust separator with a tangential inlet nozzle is known _T the permanently installed, air

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ELEX's guiding devices, see German patent specification 861 497 ♦ Here, however, the eighth parts already mentioned occur again because these known guiding devices are fixed in place and are therefore subject to erosion.

The invention has the object augrunde to improve the heat exchanger de "r type mentioned above so that the outflow of IPeststoffpartikel lie with the gases with safety Λ is it prevented.

The solution to this problem by the invention is that in the container between the feed device for the fine-grained material and the central drainage channel for the gas one concentric to it, provided with a drive device Impeller is arranged. Thereby the 3? Est fabric becomes agaric In addition, an acceleration is given, whereby their outflow with the gases is definitely prevented. Also the with the known Leitschairfeln mentioned. " stepping> Jronion is down to a. insignificant ifexa decreased.

In a further embodiment of the invention it is provided that the feeding device is inserted into the container from above oir £ aü: adende liingdüse is formed. Since, with can in more advantageous "/ the container looks down on itself

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extending, for = the discharge of the fine-grained material have downward-open annular channel, and the inflow channel for the gas can open into this inlet channel.

Tray another advantageous feature of the invention can be provided here that radially outside of the feed device for the fine-grained material on with the Container axis concentric circles, individual guide segments leaving openings between each other. arranged are that see overlap and at the overlap points Column for the passage of the gas or the fine-grained Form good. '

The elements mentioned cause for themselves and together an order promoting the heat transfer of the flow of material and solid material which is directed opposite one another with regard to their radial components. In addition, the guide segments cause an extension of the residence time of the solid particles in the apparatus and a "particularly intensive heat transfer in the region of the left free between the ieitsegmenten openings where the turbulence due to the contractions and ümlenldingen is particularly _intense.

The driven impeller ensures not just one

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very large particulate matter separation in the exhaust gases, but the ¥ irbelsenk: e also supplies rotational energy, without significantly affecting the temperature gradient. Since the raw meal is blown in outside the impeller, there is no direct contact and. associated with it Wear and tear.

Further advantages and details of the invention result from the following description of some exemplary embodiments referring to the drawing »In this show:

lig. 1 shows a vertical section through an exemplary embodiment according to the line I-I of the Big. 2,

lig. 2 of this Ausführungsbeispiöl in view from above, lig. 3 is a side view for another embodiment, S ¹ Ig. 4 the same embodiment in view from above,

, 5- a vertical section according to öler Mnie Y-V of fig, 6 by a further execution company, and

Jig »6 elneii Hdriaöntalaohnitt naoh der iilni # tl-Vt ' der

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The heat exchanger shown in the Pig. It has a circular cylindrical container 2-. This is provided with an inflow channel 3 opening tangentially on the outer circumference, to which the furnace exhaust gases are fed as heating gas via a line 4 YQm rotary kiln 1, and with a central outflow channel 5 for the gas. The inflow channel 3 is thus designed so that it introduces the gas into the container with a rotary movement about the container axis. The gas is sucked out of the discharge channel 5 by a fan 6.

In the interior of the container 2, in the vicinity of the drainage channel 5, there is a feed device 7 for the cement loam meal, ie for the fine-grained material to be brought into heat exchange with the gas, to which the cement raw meal is fed via a line 8. The container 2 has an outlet opening 9 on its circumference for the fine-grained material that has passed to the outside, and a collecting channel 10 connects tangentially to this opening 9. This collecting channel 10 is. provided with a cyclone 11, the gas outlet point of which is connected via a line 12 to a point 13 of the container 2 which is further inward than the outer surface.

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In the device described, the gas entering the container 2 through the inflow channel 3 is given a flow movement in the shape of a vortex, with the vortex core lying in the container axis. The fine-grained material is added to the gas in the vicinity of the vortex core with the aid of the feed device 7. The material is carried along by the gas, so that with it it executes a rotary movement along the axis of the container. The feed device 7 is also designed so that the fine-grained material receives a taiigentiale speed component in the sense of the rotary movement of the gas immediately upon its exit.

The fine-grained material is now with the rotary movement thrown outwards by the gas due to its higher specific weight. It thus moves against the inward radial component of the gas velocity. At the same time, the fine-grained goods are below Heat exchange with the gas, namely it is heated here by the gas in pure countercurrent. So it arises favorable heat transfer conditions.

TJm the residence time of the fine-grained material in the heat; Extend exchangers are in the illustrated embodiment in the flow space of the container 2 approximately

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3jeitae.gmen.te 14 running centrically to the container axis arranged, these each catch a - "part of themselves, against fine-grained goods moving on the outside. However, it is then carried along by the gas flow along the guide segments 14 and at the end of the guide segments 14 each further into one outside part of the gas flow. ■

Eventually this will be up to the outer circumference of the container 2 fine-grained material arrived with part of the gas introduced into the container 2 from the gas provided with the cyclone 11 Collective channel 10 added. The fine-grained material is separated out in the cyclone 11 and via a line 15 with the end cap 16 fed to the rotary kiln 1, while the part of the gas flowing through the collecting duct 10 via line 12 at point 15 of container 2, at which the pressure in operation is lower than in the collecting channel 10, is returned to the container 2.

I ¹ IgV 3 and 4 show a heat exchanger, which is intended for the heat treatment of fine-grained goods, the heat content of the heated goods being used again after the treatment

The heat exchanger here has two tanks 2 ¹ and 2%, which in their design essentially correspond to the tank 2;

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Pig. 1 and 2 correspond. Each of these containers is with an inflow channel 3 '"or 3" which opens tangentially on the outer circumference and with a central outflow channel 5' "or 5 "for the gas. Inside each container there is a 5 'or 5" in the vicinity of the outlet channel Feeding device 7 'or 7 "for the fine-grained material

and each container has an outlet on the outer circumference Opening 9 or 9 "for the fine-grained material that has come out.

From a combustion chamber 17, the combustion gases are introduced into the container 2 'through the inflow channel 3'. The gases are in this container 2 'as in the container 2 of the]? Ig. 1, a flow movement issued in the porm of a vertebral depression. The fine-grain material to be treated is passed through a line 8 ^r into the feed device 7 ¹ . Bs gets to the outside by absorbing heat and enters with a hatchet of the gas through the outlet opening 9 'into a collecting channel 10 * with cyclone 11', there it is separated from the gas and passes through a line 15 * with end cap 16 ♦ into the feed device 7 "of container 2". The gas leaves the cyclone 11 'through a line 12' and is fed back to ^{the container 2 1} at a point 13 ^1.

Container 2 "is used for the line 3 ¹ * voa d <ör Atmos- · 9Q9Ö3Ö / 0347 - 10 - '

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cold air supplied. This receives 2 "in the container. also a flow movement in form of a vortex mustard. The hot, fine-grained material introduced by the feed device 7 ″ reaches the outside while being cooled and passes through the outlet opening 9 ″ with a part the air into a manifold 10 "with cyclone 11". That Separated fine-grain material is transported through a pipe 15 "with flap 16" discharged while the air is through a line 12 "to a point 13» of the container 2 " is returned.

The emerging in the central drainage channel 5 'of the container 2' Exhaust gases are sucked off by a fan 6 'and directed into the open. The in the container 2 "through the air to be cooled, however, is heated by the central drainage channel 5 "through a fan 6" as . Combustion air promoted into the combustion chamber 17.

In the case of the PIg. 3 and 4, instead of the exhaust gases from the furnace of FIGS. 1 and 2, a special heat source is used to generate the hot gases. The heat exchanger can be used, for example, for burning hydraulic lime which would then have to be ground before burning . Because after the heat treatment in the container 2 ″ the

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Heat contained in the material for preheating the combustion air is exploited, the system operates economically.

The heat exchanger described in FIGS. 3 and 4 could, however, also be used for the cold treatment of a fine-grain material, with a cold generator being used instead of the combustion chamber 17.

The yiar exchanger after the pig. 5 and 6 is for example intended for the heating of fine-grained goods through the exhaust gases of an oven 21. Sr has a circular cylindrical Container 22 on the outside with a

1 downwardly extending inlet channel 22 is provided. In these At the entrance 22 'an inflow channel 23 opens tangentially, to which the furnace exhaust gases are fed as heating gas via a line 24 from the furnace 21. The container 22 is also provided with a central discharge channel 25 for the gas. The inflow channel 23 is thus designed such that it Gas with a rotary movement around the Behäl terachse over the

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Hing channel 22 introduces into the container 22. From the drainage channel 25 the gas is blown by a fan not shown sucked off.

Inside the container 22 at the "level of the drainage channel."

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a feed device for the fine-grained material to be heated up by the Heiagas is arranged, which is connected to an annular space 26 and consists of an annular nozzle 27 "which opens into the container 22 and is coaxial with it. The material is blown into the annular space 26 through a line. - _:

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The ring channel 22 is open at the bottom and thus forms one Outlet opening for the in the container 22 as a result of Rotational movement of the gas ejected and lengthened outwards against the inward gas flow fine-grained good. A funnel 29 connected to the outlet opening with a cap 30 collects the following good falling below. . .

The gas entering the annular channel 22 with a rotary movement around the axis of the container 22 flows upwards in this against the downwardly falling, heated fine-grained material, and then in the container 22 while maintaining the rotary movement inwards towards the central outflow channel 25 get * Between the task gate 27: for the fine-grained material and the discharge channel 25 for the gas - a concentric impeller 31 is arranged, which is connected via a coupling 52 to a drive motor, not shown. The impeller 31 is in operation in the same

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Direction of rotation driven as the gas coming from the inflow channel 23 rotates around the container axis. It will be like this Maintain a uniform rotation of the gas over the entire height of the container and avoid that from the feeding device 27 into the container 22 Can easily accumulate in the entry area or even get into the drainage channel 25

Radially outside of the feed device 27 are in the container 22 individual guide segments leaving free openings between each other on two concentric circles 33 or 34 arranged »which overlap · The flow of the gas is through interrupted arrows and that of the fine-grained Good things are indicated by solid arrows. The column 35 and formed on the Oberdeokungsstteile serve for the passage of the gas flowing inwards or the goods thrown outwards «

Two or more heat exchangers of the type described can also be for the gradual heat transfer from the gas to the fine granular material or vice versa in series using · The apparatus can be arranged one above the other, the hopper would be to make 29 so that it, the collected fine granular material in conducts the annular space 26 of the apparatus below

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Claims (4)

14 OCT. 1968 - 14 - - P 14 42 752.8 : _ 2914 Godfather η t a η s ρ r ü c Ii e: 1V heat exchanger for heat exchange between a fine-grained Well and a gas stream, especially for preheating, calcining and burning cement powder through furnace exhaust gases, which are subject to a flow movement in JOrm given to a whirlpool and that in heat exchange fine-grain material to be brought with the gas in the Near the whirling core "is added, so that it is ■ faei the rotary motion with the gas against the radial one Component! deä? Sas velocity under heat exchange is moved with the gas to the outside and then collected again, which at least one at least approximately circular cylindrical container and this container with at least one outer circumference • Emptying ^ for the introduction of the gas into the container inflow channel designed with rotary motion and with a central flow channel for the gas soAvie im Inside, near the drainage channel, with a feeding device for the fine-grained to be brought into heat exchange with the gas. Is well equipped and the Container outside, at least one outlet opening for the fine-grained good that has come out has a - 909839/0347 - 15 - -.-; . . . ■ ■■ '■ -. ■■■■'. ' "■: BAD ORIGINAL 14A2732 characterized in that in the container (22) between the feeding device (2?) For the fine-grained material and the central discharge channel (25) for the gas concentric to it, with a drive device provided! impeller (31) is arranged. 2. Heat exchanger according to claim 1, dad η rch in that the feed device (22) debouching annular nozzle is formed (2?) And from above into the container. ■■ "■■. 3. Heat exchanger according to claim 2, characterized in that that the container (22) is outside one downwardly extending for the discharge of the fine-grained • - i »G-utes has downwardly open hanging channel (22) and the inflow channel (23) for the gas in this inlet channel (22) joins. 4. Heat exchanger according to one of claims 2 or 3, characterized in that radially outside of the feeding device (2?) for the fine-grained material on circles concentric with the container axis, individual Jjöit segments leaving openings between each other (33, 34) are arranged, which overlap and at the overlap points gaps (35, 36) for the passage of the gas or the fine-grained material. 90S839 / TT3T7 " BATH ORIGINAL / Ib. Blank page