DE2205135A1 - Device for the continuous cooling of dried materials - Google Patents

Description

J. February 1972 A 2472 Pi / ib

SNIA VISCOSA SOCIETÄ NAZIONALE INDUSTRIA APPLICAZIONI VISCOSA, 18, Via Montebello, Milan, Italy

Device for 'the continuous cooling of dried materials, according to patent .... (patent application P 18 10 195.4-16 )

The invention relates to an improvement or further development of apparatus or systems to those in the main patent application P 18 10 193.4-16 of November 21, 1968 Purposes, and it is hereunder as to the requirements and end purposes in connection with the present invention Referenced.

According to the main characteristic of the main patent, the cooling apparatus was generally installed on a section of a pneumatic conveying system for grains between a drying plant and a processing device for grains. As is known, these pneumatic conveyor systems practically comprise a feed line ₃ through the

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a gas atmosphere flows at very high speed and entrains the grains. It is understandable that to do so which the kinetic energy must be correspondingly strong in order to develop such a conveying speed Of course, speed is related to the required performance and vice versa to the cross-sectional diameter of the inflow line.

The cooling apparatus in and of itself consisted of a metal hollow body which was mounted to rotate around its axis and had coaxial connections at the head parts, at the inlet end for the supply line and at the outlet end for the extraction of the pneumatic conveying line. The system was mounted in such a way that there was a had a small inclination, and also means were provided by which the inflowing body repeatedly with had to come into contact with the metal walls before the output port was reached, so that the heat exchange by means of the metal walls and the cooling of the grain without any significant influence from the internal gas atmosphere took place, be it with regard to drying (combined with a dehumidification), be it in the opposite way, around the original in the dry bodies subjected to cooling Maintain moisture content.

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The present improvement relates in particular to the means inside the rotary drum by which the intended effect of the continuous port movement of the grain from the material inlet side of the cylinder the outflow side of which is obtained by, statistically speaking, the greatest number under the most favorable conditions to bring grains into contact with the metal cooling surfaces, and this under predetermined and variable States of the length of stay, or better said, the throughput times of the grain within the Cylinder.

The invention essentially comprises the presence and use of: a shield or shield opposite to the axial inlet confluence for the grain, whereby the one taking place at high speed Flow can be interrupted, so that the incoming grain is forced to the bottom surface of the cylindrical To fall down the chamber; in the interior of the drum a plurality of arranged at least on the longitudinal sides of a metal wall Shovels, through which the grain according to the TEm rotation is whirled up to then fall down again, which is due to the rotation and the inclined position of the drum closer and closer to the exit; then appropriate means to

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the one arriving at the opposite end or headboard To bring the grain back next to the axis position of the apparatus, and finally to let it trickle to the outflow mouth, the latter being connected to the pneumatic conveying line, the cross-section of which is a restoration the flow rate in the gas atmosphere.

These and other specific properties of the Invention in the course of the detailed description that follows, it is preferred, but not exclusive Embodiment according to the drawings, where:

1 correspond to FIGS. 1 and 2 of the main patent and 2 and a better understanding of the processes serve in the present invention;

Fig. 3 Cross-section of the apparatus at the interface 5-3 according to FIGS. 1 and 2;

Figures 4 show a longitudinal section and some structural ones and 5 simplifications to the inlet and outlet head parts of the cylinder or the rotary drum;

Fig. 6 shows on a larger scale the drum outlet in cross section 6-6 of Fig. 5i

Fig. 7 shows part of an intermediate section of the

Rotary drum according to another embodiment of the invention according to section line 7-7 in Fig. 8, as well as a partial side view the internal components; and

FIG. 8 shows the same varied embodiment at the interfaces 8-8-8-8 of the aforementioned FIG. 7.

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The main patent according to and as shown in Fig. 1 and 2, the apparatus has a rotary drum, which consists of an elongated metal cylinder 10 rotatably mounted on the roller bearings 11 and 12, which is connected to a frame 15 from a cross member ^^ ■ Pair of I- ^{side support rails 15 * and 13 ft} (Fig.5) and driven with a toothed ring 16 attached to the drum by means of a pinion (Fig.1) by a geared motor 17 housed in the frame 13. The drive of the ring gear 16 can also take place via a drive belt.

The frame 13 is mounted on its foundation 18 so that that the desired inclination or slope B relative to the horizontal plane A-A is achieved, for example with the help of joint supports I9 and bases 20 by means of Lifting tools, for example one or more threaded bolts 21, which can also be replaced by other suitable ones Have means such as hydraulic jacks, wedges and the like replaced.

The outer surface of the drum 10 is at least partially cooled, preferably by being sprinkled with water,

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for which the connecting pieces 22 are provided and the poured water is distributed on the back of the drum with the aid of a perforated tube 25 (FIGS. 2 and 5). The water flowing off in the direction C (FIG. 1) over the outer surface of the drum is collected by the tub 2h below and drained through the drainage openings 25, for example. The cooled back part of the drum can be shielded by a kind of half cylinder jacket 26.

In a first embodiment according to the invention, a plurality of longitudinal blades 50 (FIGS. 5 and 5), preferably with an "L" or curved profile, directed in the direction of rotation ¹¹ D "of the drum (FIG. 3) and provided at equal intervals, are inside the drum .

The head parts of the cylindrical drum are preferably formed by conical parts 51 and J> 2 and have connecting pieces 55 and 54 for a feed and pressure line of the grain, which is fed in swirled by the gas atmosphere at a high flow rate. In Fig. 2, 55 denotes a bend for the supply line. These leads are not shown and are not described, especially since they are known per se, as are the

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Relationships of the cross-sections in relation to the power and flow rate of the gas atmosphere for the purpose of pneumatic locomotion of the grain are known. Considering the possible change in slope B to the drum 10 and thus the changing height of the inflow manifold 35, the same is preferably made of one flexible material chosen.

Inside the drum 10, opposite to the inflow clip 33 is a shield 36 (Figure 2 and 4) for shielding the gas atmosphere intended for the transport of the grain. The shield 36 has opposite the drum diameter a smaller diameter, so that an ample ring-shaped passage for the grain is given and this can fall freely to the bottom of the chamber. Furthermore, considering the large diameter of the drum 10 with respect to that of the pneumatic feed line is reduced the flow velocity over the entire length of the drum to an insignificant value, in any case insufficient to carry away the grain.

Opposite to the outflow nozzle 34 is an outflow funnel or conical head part 32 is provided, which in relation

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to the discharge nozzle ^ 4 forms a conical passage. In the part adjacent to the outlet head part J52, the blades JO (Pig. 3) are replaced by radial blades JO ¹ (Fig.5), which extend along the conical passage J> 8 to at least the outlet J> k , where they form radial walls JO ¹¹ (Fig. 5 and 6), which divide the passage into individual sectors.

The cooler of the invention works essentially as follows:

The grain, which is pneumatically moved forward at high speed, enters the apparatus through the inlet connection J>J>. The flow rate is reduced by the shield 36, whereby the grain falls by its own weight to the bottom of the drum. As a result of the rotation of the drum, the mass M of the grains is chopped up by the paddles J50 and distributed over the length of the drum, then lifted up, and then falls back to the bottom of the drum like a rain, as shown in FIG. J5.

In this way the mass M experiences a continuous mixing and subdivision, whereby, statistically speaking, each grain comes into contact with the inner surface of the drum 10, which by the continuous heat emission has a cold surface * Naol'dsm die 'shovels JO

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are also solidal with the drum, they also contribute to the extraction of heat in the grain.

In view of the oblique axis position B of the drum, the 'raised ¹ on the drum base (Pig. 4) and grains detected at the points P again' of the blades 50 gradually at the positions P allowed to 'fall to the outflow side. The sequence in which the grains are lifted and dropped again simultaneously causes a progressive mechanical port movement of the same between entry and exit. It is understandable that by changing the slope B on the drum axis, the mechanical port movement speed also changes, and consequently the dwell time in the cooling chamber can also be largely determined as desired.

When the grains reach the outlet side of the drum (Pig. 5), the operation of pumping up and releasing continues until the experts have reached the inflow edge in the larger diameter of the conical supply line 37. When this edge is exceeded, the guide ribs formed by the parts JO 'and 30 ⁵¹ force the grains to trickle into the outflow nozzle 54, as a result of the progressive reduction in the flow cross-sections

a

38 results in the outflow nozzle y \ / flow stand, the

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corresponds to a pneumatic conveyance. The gas stream entering through the inflow connection 33 flows through it at lower flow rate the entire length of the drum 10 and is then forced to its speed to increase until the required flow rate has been reached for the pneumatic transport to get the cooled grains at the exit in order, as can be seen in FIGS. 2 and 5, to flow out in the direction E. and to feed the grains to their processing destination or storage by pneumatic means.

According to a modified embodiment shown in FIGS. 7 and 8, the cooling effect is due to contact with the cooled metal surfaces noticeably increased if there is a second, smaller drum inside the drum 10 110 is also installed coaxially, since this second drum forms a space within which the grain is advanced and cooled as already described, The head parts of the inner drum 110 can replace the shields 36 and 37 according to FIGS. 2, 4 and 5. E.g., can the one head part of the cylinder 110 take the place of the conical shield 36 (FIG. 4). The inner drum is also solidly with the outer drum, and the mechanical connection between the equiaxed components

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follows preferably by means of tubular elements 125, the end parts of which open outwards or inwards to the smaller drum 110. These tubular parts 125 also serve to ensure that some of the water trickling onto the back of the outer drum also penetrates to the inner drum 110 and cools it in order to then be gripped by the troughs 2k below when the parts 125 pass through the lower sheet in the course of rotation.

The inner surface of the outer drum 10 is provided with "L" shaped blades or spoons, as noted in FIG Figures 3 to 5 described, and similar blades 130 equipped, which are designed in the opposite direction to the first and mechanically and thermally to the outer surface the inner drum 110 are connected.

As is particularly evident from FIG. 8, the extraction of heat from the grains is increased as a result of contact with the metal surface, since the grain mass whirled up and divided by the blades 30 of the outer drum 10 experiences a first crash M ¹ , contrary to the previous embodiment distributing the grains on the back surface of the inner drum 110 where the grains are picked up by the respective paddles I30,

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In order to be distributed to earth again in the event of a second fall, M ¹ ', as soon as the drum has performed another half-turn.

In the embodiment of Figures J and 8, there is a statistically increased possibility of each grain repeatedly coming into contact with a cooled metal surface after the development of the metal surfaces has increased significantly (by adding the inner drum 110 and the corresponding paddles 1 ^ 0), so that the number of subdivisions, repeated mixing operations and grain crashes can also be doubled, since this process occurs twice with each rotation.

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Claims (1)

PATENT CLAIMS Rotary drum cooler according to patent ... (patent application P 18 10 193 · 4), characterized in that compared to the axial inflow passage (33) axially a shield (36) of smaller diameter compared to the inner diameter of the drum body (10) is arranged in order to influence the grain to the effect that it to the inner surface of the drum body (10) is deflected laterally, and on the latter, in the direction of rotation (D) of the drum, longitudinally Hook-shaped attachments (30) are attached which, due to the rotation, shovel up the grain (M) and then crash again let it also slowly to the axial exit (34) advances. 2. Rotary drum cooler according to claim 1, characterized in that in the interior of the conical output part (32) between the cylindrical body (10) of the drum and the outflow nozzle (34), the hook-shaped lugs (30) from the radial walls (30 ¹ , 38) fo *, whereby they form sectors closed inwards by an equiaxed conical wall (37) by means of which the grain is grasped and forced to reach the exit (34) as a result of the rotation of the drum. 209834/0836 " ¹ ^ ~ J5. Rotary drum cools it according to claim 1 or 2, characterized characterized in that said converging route (32) and said conical inner wall (37) together form a passage, the cross section of which is towards Outflow direction (E) progressively reduced, a passage through which the grains to be transported to Drum used gas atmosphere flows and after traversing the drum in its entire length at lower Flow rate (because of the larger cross-section of the drum) is forced to return to its pleating speed to increase in order to achieve that speed again, which is detectable for the suspended grains is. 4. Rotary drum cooler according to claim 1, 2 or 3 * characterized in that inside the cylindrical body (10) of the drum a second equiaxed body (110) is housed with a smaller diameter, the with the cylindrical body (10) a passage (112) with annular Forms a cross-section through which the grain, which is under cooling, slowly trickles. 5. Rotary drum cooler according to claim 4, characterized in that the outer surface of the inner body - 15 - 209834/0836 (110) has hook-shaped attachments (1J0) on the long side, which scoop the grain (M ¹ ) emptied from the hook-shaped attachments (JO) on the outer body (10) and drop it for the second time (at M ^{11) with each rotation of the drum,} after it has fallen on the outer surface of the inner body. 6 * ^ r rotary drum cooler according to claim 4 and 5, characterized ^ characterized in that the equiaxed inner body (110) is connected to the outer body (10) by means of pipe parts (125) is through which part of the cooling liquid for the outer body (10) into the interior of the inner body (110) flows over, in order to then flow downwards after cooling due to the rotation of the drum. 209834/0836 OftlGJNAL INSPECTED