JPH06134277A - Countercurrent granulation equipment - Google Patents

Abstract

PURPOSE:To improve the title equipment so as not only to suppress the bonding and solidification of liquid droplets in the vicinity of a dripping nozzle but also to make the mutual contact of the liquid droplets in an unsolidified state hard to generate during falling. CONSTITUTION:In countercurrent granulation equipment forming granules having room temp. by bringing the liquid droplets of the high temp. molten liquid dripped from the dripping nozzles provided to the upper part of a granulation tower 1 into contact with the cooling gas allowed to flow from the lower part of the graulation tower 1, a plurality of the dripping nozzles are arranged around the cooling gas discharge port 5 provided to the central part of the ceiling surface 4 of the granulation tower l and an inner exhaust cylinder 7 is provided to the granulation tower 1 so as to extend into the tower 1 from a discharge port 5. Therefore, productivity and the quality of a product are enhanced and yield is also enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a countercurrent type granulation equipment for producing granular materials such as various chemical products and solid fertilizers from a high temperature molten liquid.

[0002]

2. Description of the Related Art Various chemical products, solid fertilizers, etc. are processed in a molten state at high temperature during the synthesis process,
For transportation and use, it is convenient to take the form of solid particles with high fluidity, and in the final step of these synthesis plants, cooling granulation equipment may be provided for that purpose. It is common.

In this cooling granulation equipment, a shower nozzle having a so-called perforated plate such as rain and dew is arranged in the upper part of the granulation tower, and high temperature liquid droplets are dropped in the form of a shower from this, and low temperature air or non Granulation in which a cooling gas such as an active gas is made to flow from the bottom to the top in the granulation tower, and the cooling gas is brought into contact with liquid droplets to obtain solid particles at room temperature, which are discharged to the outside of the tower. The process is ready to run.

[0004]

In such a counter-current type granulation equipment, the end of the dropping nozzle opening into the granulation tower by the wall flow of the cooling gas having a high flow velocity along the inner surface of the granulation tower. May be excessively cooled, so that the dripping liquid adheres to the inner surface of the sleeve equipped with the dripping nozzle and grows like an icicle, or the surface temperature of the dripping nozzle excessively drops and melts. The liquid may be solidified without dropping and the dropping nozzle may be clogged.

Further, it is general that the cooling gas flows into the granulation tower from the side of the lower part of the granulation tower, and the dropping nozzle causes the cooling gas to flow inside the granulation tower. Since the swirling flow of the cooling gas is likely to occur in the vicinity of the portion opened to, the unsolidified droplets may come into contact with each other and adhere to each other. This is not preferable because the particle size becomes irregular and the quality of the product deteriorates.

The present invention has been devised in order to eliminate such inconveniences of the prior art, and its main purpose is to prevent the liquid droplets from adhering and solidifying in the vicinity of the liquid dropping nozzle,
Moreover, it is an object of the present invention to provide an improved countercurrent type granulation equipment in which unsolidified droplets are less likely to come into contact with each other during falling.

[0007]

According to the present invention, it is an object of the present invention to provide, from the lower part of the granulation tower, the liquid droplets of the high temperature molten liquid which are dripped from the dropping nozzle provided in the upper part of the granulation tower. The structure of the countercurrent type granulation equipment that produces granular material by contacting with the flowing cooling gas is such that a plurality of dropping nozzles are arranged around the cooling gas discharge port provided at the center of the ceiling surface of the granulation tower. This is achieved by extending the exhaust inner cylinder from the discharge port to the inside of the granulation tower.

[0008]

In this way, by providing the exhaust gas inner cylinder protruding into the granulation tower at the cooling gas discharge port, stagnation occurs in the cooling gas flow above the lower end of the exhaust gas inner cylinder. The temperature environment in the vicinity is improved and the supercooling of the same part is suppressed. Moreover, the exhaust inner cylinder suppresses the generation of turbulent flow such as swirling flow near the dropping nozzle.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described in detail below with reference to specific embodiments shown in the accompanying drawings.

FIG. 1 is an overall schematic view of a granulation tower according to the present invention. This granulating tower 1 has a cylindrical shape in which the upper and lower ends are respectively narrowed, a product take-out port 2 is provided at the lowermost end, and a cooling gas supply port 3 is provided so as to project to the immediate upper side thereof. There is.

The ceiling 4 of the granulating tower 1 has a frustoconical shape with a relatively gentle slope and is narrowed upward, and a cooling gas discharge port 5 is provided at the center thereof. And at equal intervals on the common circumference that surrounds the periphery of this discharge port 5,
A plurality of dropping nozzles 6 are arranged via a sleeve 8. Further, an exhaust inner cylinder 7 which projects into the granulation tower 1 with an appropriate size is provided in the cooling gas discharge port 5 so as to extend in the axial direction of the granulation tower 1.

High-temperature stock solution supplied into the dropping nozzle 6 (for example, bisphenol A heated to 170 degrees Celsius)
Is dropped into the granulating tower 1 from a perforated plate provided in the dropping nozzle. The dropped droplets are cooled in contact with the cooling gas blown from the lower side of the granulating tower 1 while falling in the granulating tower 1, and before reaching the product outlet 2 at the lower end of the granulating tower 1. It solidifies into a generally spherical granular material.

Now, in the present invention, the ceiling 4 of the granulation tower 1
A plurality of dropping nozzles 6 are arranged around the cooling gas discharge port 5 provided at the center of the granulation tower 1 from the discharge port 5.
The exhaust inner cylinder 7 is extended inside.

As a result, stagnation occurs in the cooling gas flow above the lower end of the exhaust inner cylinder 7, so that the dropping nozzle 6
The temperature environment in the vicinity is improved and the supercooling of the same part is suppressed. Moreover, since the cooling gas in the vicinity of the opening of the sleeve 8 with respect to the inner surface of the ceiling 4 is not affected by the cooling gas flow in the granulation cylinder 1 due to the exhaust inner cylinder 7, a turbulent flow such as a swirling flow is generated in the same portion. Is suppressed.

Although the ceiling 4 of the granulating tower 1 has a conical shape in the above embodiment, it may have a flat shape.

[0016]

As described above, according to the present invention, the liquid in the vicinity of the opening of the dropping nozzle on the inner surface of the granulation tower is excessively cooled by the cooling gas and is attached to the inner surface of the sleeve provided with the dropping nozzle. It is possible to avoid inconveniences such as the droplets growing in an icicle shape, the surface temperature of the dropping nozzle dropping excessively, the droplets solidifying without dropping, and the dropping nozzle clogging. In addition, since it is not affected by the cooling gas flow that has flowed into the granulation tower from the side of the lower part of the granulation tower, the occurrence of the phenomenon that unsolidified droplets contact each other and adhere to each other is reduced. To be done. Therefore, continuous operation for a long time is possible, so that productivity is improved, and since grain size is stabilized, product quality is improved and yield is increased.

[Brief description of drawings]

1 is a schematic overall view of a granulation tower according to the present invention.

[Explanation of symbols]

 1 Granulation Tower 2 Product Outlet 3 Cooling Gas Supply 4 Ceiling 5 Cooling Gas Discharge 6 Dropping Nozzle 7 Exhaust Inner Cylinder 8 Sleeve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuo Moriya 2-12-1, Tsurumi Chuo, Tsurumi-ku, Yokohama-shi, Kanagawa Chiyoda Kakoh Construction Co., Ltd. (72) Katsumi Tozaki 2 Tsurumi-chu, Tsurumi-ku, Yokohama, Kanagawa Chome 12-1 Chiyoda Kakoh Construction Co., Ltd. (72) Inventor Yoshikazu Hozumi 2-12-1 Tsurumi Chuo, Tsurumi-ku, Yokohama-shi, Kanagawa Kanagawa Prefecture Chiyoda Kakoh Construction Co., Ltd. (72) Inventor Tsunemitsu Tanaka Tsurumi, Yokohama 2-12-1, Tsurumi Chuo-ku, Chiyoda Kako Construction Co., Ltd. (72) Inventor Naorenori Ashizawa 7-12-4 Minamisuna, Koto-ku, Tokyo Ashizawa Spray Plant Co., Ltd.

Claims (1)

[Claims] 1. A countercurrent flow for producing particulate matter by bringing a droplet of a high-temperature molten liquid dropped from a dropping nozzle provided in an upper portion of the granulation tower into contact with a cooling gas flowing from a lower portion of the granulation tower. In the granulation equipment, a plurality of the dropping nozzles are arranged around a cooling gas discharge port provided in the center of the ceiling surface of the granulation tower, and exhaust gas is discharged from the discharge port to the inside of the granulation tower. Countercurrent granulation equipment characterized by extending the inner cylinder.