JPS609228B2 - Unbalanced air flow generator in fluidized fluid dryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a biased airflow generator disposed inside the bottom of a fluidized fluidized drying tower constituting a fluidized fluidized dryer.

Among dryers, the fluidized drying tower type fluidized dryer pulverizes the dried material into fine pieces when drying the undried material, and also uses the hot air supplied from outside the fluidized dryer into the fluidized dryer and the crushed undried material. It has many advantages such as increasing the effect of contact with dried materials, drying crushed undried materials in a short time, and being able to process even undried materials whose composition changes due to heat. are doing.

The present applicant has previously proposed an impeller rotatably provided inside the bottom of the fluidized drying tower in the fluidized fluidized dryer mentioned above, which is rotated at high speed by a rotary drive device, and the undried materials introduced therein are rotated at high speed by a rotary drive device. is applied to a rotary impeller, the impact causes it to be crushed, and the unbalanced air current generated by the rotary impeller blows it up against the fluidized fluid dryer, and the resulting fragments collide with each other to break them into smaller pieces. proposed a device in which fragments that fell onto the impeller without being crushed are further crushed by a rotary impeller, and this is repeated with newly input undried material to finally break it down into fine particles.

However, with this device, the drying process is carried out while crushing the undried material, and over a long period of time, the dried material that has been finely pulverized by the impeller is deposited on the side wall of the suction side of the impeller. The residual dry matter adheres to or accumulates on the machine, and the hot air supplied from outside the equipment burns the residual dry matter, producing a foul odor, or in severe cases, ignites the crushed dry matter adhering to the side walls. There is a danger. In addition, in order to prevent the finely powdered undried material from adhering to the side wall of the device, the blades of the impeller are set to the maximum size. Because it also has a purpose, its circumferential speed must be maintained at a level that will cause the crushing of undried materials, and if you try to rotate an impeller equipped with large blades to maintain this, the The disadvantage was that the power of disturbance had to be increased extremely. The object of the present invention is to provide a fluidized dryer of the fluidized drying tower type (hereinafter simply referred to as a fluidized dryer) that eliminates the above-mentioned drawbacks, efficiently crushes undried materials, and reduces shaft power. To provide an airflow generator.

In order to achieve the above object, the present invention rotatably supports an impeller for generating a biased air flow in parallel inside the bottom of a fluidized fluidized dryer, and scatters undried materials on the suction side of the impeller. A scattering plate is rotatably attached to a shaft along with an impeller, and by the rotation of the impeller, the undried material put into the fluidized fluid dryer is crushed into fine pieces, and at the same time, the fluid is raised and deposited on the negative pressure suction side of the impeller. The apparatus is characterized in that the undried material is scattered and raised by a rotating scattering plate.

An embodiment of the present invention will be specifically described below with reference to the drawings.

In Fig. 1, 1 is a fluidized dryer constructed in the style of a fluidized drying tower.The bottom of this fluidized dryer has a slightly W-shaped cross section, and a pair of impellers are arranged in parallel inside this bottom. A biased airflow generator 2 is provided. As is clear from Fig. 2, the details of the fluidized dryer 11 include a pair of rotating shafts 3,
4 are inserted and supported in parallel, and a pair of impellers 5, 5 are attached back to back in the center of the fluidized fluid dryer 1 to one rotating shaft 3, which is inserted and supported in parallel. There is a pair of impellers 5, 5 separated on both sides of the fluidized dryer 1.
is installed. On one rotating shaft 3, each impeller 5,
A pair of scattering discs 6, 6 are attached along the inner surface of the fluidized fluidized dryer 1 on the outside of the rotary shaft 4, and each impeller 5, 6 is attached to the other rotating shaft 4.
A scattering plate 7 is attached at the middle part of 5.

These scattering disks 6, 7 are configured such that a plurality of pins 10 are provided protruding along the citrus direction at desired intervals on the outer periphery of a ring or disk 8 attached to the rotating shafts 3, 4. . Each rotating shaft 3, 4 is linked to a drive device (not shown), and the rotating shaft 3 is rotated clockwise as shown in FIG.
is rotated counterclockwise. A sound absorbing material 11 is attached to the outer surface of the fluidized fluidized dryer 1 so as to surround the outer peripheries of the rotating shafts 3 and 4, thereby absorbing the noise caused by the operation of the biased airflow generator 2. In Fig. 1, 12 is an inclined chute that is passed through the lower part of the fluidized fluid dryer 1, and 13 is an inclined chute 1.
2 is a conveyor device that is passed through, 14 is a conveyor device 13
paddle mixer connected to , 15 is paddle mixer 1
4 is a conveyor device for introducing undried materials.

16 is a furnace body connected to the lower part of the fluidized fluidized dryer 1 by a duct 17, 18 is a combustion device, and 19 is a rare air inlet connected to the upper part of the furnace body 16.

A cyclone separator is connected to the upper end of the two-stream fluidized fluid dryer 1 by a sea breeze duct 21, and 22 is a rotary valve provided at the discharge port 23 of the cyclone separator 20.
24 and 25 are branch pipes connected to the discharge port 23, and 26 is a splitter provided at the branch part of the branch pipes 24 and 25.

One branch pipe 24 is connected to the paddle mixer 14. 27 is a conveyor device connected to the other branch pipe 25, 28 is a product tank connected to the conveyor device 27, and 29 is a product delivery conveyor device connected to the outlet of the product tank 28.

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A dust collector 32 is connected to the two separators by a duct 31, and 32 is a fan installed in the middle of the duct 31.
Therefore, when this device is operated, hot air is constantly sent into the fluidized fluidized dryer from the furnace main body 16 connected to the combustion device, and an upward air current is generated by the biased airflow generator installed in the fluidized fluidized dryer 1. This rising air current is exhausted toward a cyclone separator and a dust collector placed outside the fluidized fluidized dryer.

In order to dry a high-moisture dry product using this device, the undried product is sequentially introduced into a paddle mixer 14 by a conveyor device 15, and then passed through a screw conveyor device 13 and an inclined chute 12 for fluidized drying. It is placed in the upper center of the biased airflow generator 2 inside the machine 1.

Most of the input undried material is crushed into fine particles by the blades of the rotary impeller that constitutes the uneven airflow generator, and the impeller 5
Riding on the uneven airflow generated by the rotation of the dryer, it is thrown up as it hits the upper part of the fluidized fluidized dryer, and is further divided into smaller pieces. Since hot air is constantly fed into the fluidized fluidized dryer as described above, the finely divided and crushed undried material is dried. On the other hand, some of the dry matter with large particle size is once thrown up to the top of the fluidized bed dryer by the rotating impeller 5, but falls due to its own weight and is sucked into the negative pressure part of the rotating impeller. A scattering plate that rotates together with the impeller 5 is arranged, and the particles are crushed and scattered by the impeller 5, and the particles are flown up while colliding with each other on the uneven airflow generated by the rotating impeller, and are fragmented and dried by the impact. be done. This is mixed with the undried materials that are successively introduced and is repeated, and finally it is finely divided into fine powders. The dried material thus fragmented is transported to the duct 21 by the upward airflow generated in the fluidized fluidized dryer and the above-mentioned discharge action.
The liquid then enters the cyclone separator 20', descends under its own weight, and is deposited within the cyclone separator. The dried material collected in the cyclone separator further passes through the rotary valve 22 and is partially transferred to the branch pipe 24 by the split damper 26.
The undried material is then returned to the paddle mixer 14 and used as a dehydration accelerator for the newly introduced undried material, and the rest is fed into a product tank 28 via a conveyor device 27, from which it is further carried out by a conveyor device 29. A part of the dried material returned to the paddle mixer 14 is mixed with the undried material introduced by the conveyor device 15 to adjust the moisture content of the undried material, and also to make it easy to crush the undried material in the drying tower 1. It can be done. On the other hand, the exhaust gas carried from the fluidized fluidized dryer to the dry matter cyclone separator is separated into solid and gas by the cyclone separator 20, and then enters the dust collector 3 via the duct 31 by the exhaust fan 32, where soot and dust are removed and released into the atmosphere. be done. As is clear from the above explanation, according to the present invention,
By the rotation of the impeller, which is a device for generating biased air flow, placed inside the fluidized fluid dryer, the undried material placed on top of the impeller is crushed into small pieces due to the contact impact with the rotating impeller. The uneven air flow causes the flow to rise as it collides with the upper part of the fluidized fluid dryer, and the impact caused by this collision causes it to fragment into smaller pieces, and due to its own weight, the air flows against the uneven air flow caused by the rotating impeller. The undried small pieces that fall onto the generator are crushed by a rotating impeller along with the undried materials that are successively introduced.

However, the biased airflow generating device according to the present invention does not simply consist of an impeller with a plurality of long single plates protruding radially; Since the above-mentioned scattering disk is arranged in the negative pressure suction part formed between the impeller and the impeller, the above-mentioned undried matter is collected not only by the rotating impeller but also by this scattering disk. It also hits the disk, making the crushing action even more effective.

Therefore, the fragments of undried substances that tend to accumulate on the negative pressure suction side of the impeller are crushed by the rotation of the scattering plate that rotates together with the impeller, and are scattered and lifted by the upward biased airflow generated by the rotation of the impeller. This prevents the residue of finely pulverized dry matter from adhering to the side walls and bottom of the fluidized fluidized dryer, and as a result, the hot air supplied to the fluidized fluidized dryer prevents the adhering dried matter from being scorched. It is possible to prevent odor generation or ignition of dry matter. In addition, as mentioned above, since the undried matter that is about to accumulate is scattered by the scattering disk, the impeller can be made relatively small by 4 cm, which reduces turbulent force and allows high-speed rotation, thereby saving energy. There are advantages such as being able to

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of a fluidized fluidized dryer in which a biased air flow generating device of the present invention is implemented, and FIG. 2 is a sectional view taken from arrow D to 0 in FIG. 1. 1... Fluidized drying tower, 2... Unbiased airflow generator, 5
...impeller, 6,7... scattering plate, 14
... Paddle mixer, 16 ... Furnace body, 20 ... Cyclone separator, 28 ...
... Product tank, 30 ... Dust collector. Figure 1 Figure 2

Claims (1)

[Claims] 1. An impeller for generating a biased air flow is rotatably supported inside the bottom of the fluidized drying tower, and a scattering plate for scattering undried matter is rotatably supported on the suction side of the impeller. Unbalanced air flow generator in fluidized fluid dryer.