JPH06134276A - Dripping nozzle of countercurrent granulation equipment - Google Patents

Abstract

PURPOSE:To prevent the overcooling of the surface of a nozzle due to cooling gas, in the dripping nozzle for countercurrent granulation equipment forming granules by dripping a high temp. molten liquid to bring the same into contact with the cooling gas flowing through a granulation tower, by attaching the dripping nozzle to the ceiling of the granulation tower through a sleeve. CONSTITUTION:In the dripping nozzle 6 for countercurrent graqnulation equipment forming granules by dripping a high temp. molten liquid to bring the same into contact with the cooling gas flowing through a granulation tower 1, the dripping nozzle 6 is attached to the ceiling 4 of the granulation tower 1 through a sleeve 8. The dripping nozzle 6 is made detachable with respect to the sleeve 8 and a slide type gate valve 14 is provided on the downstream side of the dripping nozzle 6 in the sleeve 8. As a result, the overcooling of the surface of the nozzle by the cooling gas can be avoided and the capacity per one dripping nozzle is largely taken and maintenance can be enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dropping nozzle for 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 a high temperature during the synthesis process, but their storage,
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 so-called shower nozzle having a 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, as well as 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 droplets to obtain solid particles at room temperature, which are discharged to the outside of the tower. The process is ready to run.

In such a countercurrent type granulation equipment, it is necessary to prevent the molten stock solution in the dropping nozzle from solidifying. However, when the processing capacity is relatively small, or the solidification temperature of the stock solution is relatively large. When the temperature is extremely low, the molten state can be sufficiently maintained only by heating with the steam jacket provided on the side wall of the dropping nozzle.

[0005]

On the other hand, in terms of manufacturing equipment,
Alternatively, from the viewpoint of maintenance, it is preferable that the number of dropping nozzles is as small as possible. However, when it is attempted to process with a small number of dropping nozzles in a facility with a large processing capacity, the surface area of the surface of one dropping nozzle facing the inside of the granulating tower is correspondingly increased in order to secure the number of dropping holes. Since this has to be done, the amount of heat taken by the cooling gas from the surface of the dropping nozzle becomes large, and it becomes difficult to maintain the molten state of the stock solution inside the nozzle only by heating from the side wall of the dropping nozzle. Inevitably, there was no choice but to adopt a configuration in which a large number of small-capacity dripping nozzles were arranged, which was inevitable when manufacturing, operating, and maintaining the equipment.

The present invention has been devised in order to eliminate such disadvantages of the prior art, and its main purpose is to make the capacity relatively large and avoid overcooling of the nozzle surface by cooling gas. To provide an improved drip nozzle. A second object of the present invention is to provide a dropping nozzle which is excellent in maintainability.

[0007]

According to the present invention, such an object is aimed at producing a granular material by dropping a hot molten liquid and bringing it into contact with a cooling gas flowing in a granulation tower. The configuration of the dropping nozzle for the flow type granulation equipment is achieved by being attached to the ceiling of the granulation tower via a sleeve. In particular, it is preferable that the drip nozzle is configured to be attachable to and detachable from the sleeve, and that the slide type gate valve is provided on the downstream side of the drip nozzle in the sleeve.

[0008]

When the dropping nozzle is attached to the ceiling of the granulating tower via the sleeve as described above, it is not necessary to immerse the surface of the dropping nozzle from the inner surface of the ceiling of the granulating tower. The surface is less likely to be directly exposed to the cooling gas. Therefore, the supercooling of the dropping nozzle surface is suppressed. In addition, since the sliding gate valve can cut off the gap between the granulating tower and the dropping nozzle, the dropping nozzle can be individually maintained without interrupting the operation of the granulating equipment.

[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 a schematic view of a granulation tower to which the present invention is applied. 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. A plurality of dropping nozzles 6 are arranged at equal intervals on a common circumference surrounding the discharge port 5. 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.

As best shown in FIG. 2, the dropping nozzle 6 is attached to the ceiling 4 of the granulating tower 1 through a cylindrical sleeve 8 whose axis extends parallel to the axis of the granulating tower 1. Installed. The dropping nozzle 6 has a double-structured conical shell 10 whose bottom is closed by a perforated plate 9 having a large number of holes of an appropriate diameter, and is connected to the apex thereof. The heated and melted stock solution is supplied into the dropping nozzle 6 from the inside of the supply pipe 11.

A heating medium such as steam is blown into the void 12 of the double-structured shell 10 so that the melting temperature of the stock solution in the dropping nozzle 6 is maintained.

A sleeve 8 for supporting the dropping nozzle 6 is also provided.
Has a double structure similar to the shell 10 of the dropping nozzle 6, and the heating medium is blown into the void 13 to be heated.

A gate valve 14 which is slidable in a direction orthogonal to the axis of the sleeve 8 is provided between the dropping nozzle 6 and the sleeve 8. And the dropping nozzle 6
A valve body 16 of the gate valve 14 via a double-cylindrical support 15 having a heat medium introduction structure similar to that of the sleeve 8.
It is placed on top. Flange 1 of these supports 15
7, the valve body 16 of the gate valve 14, and the flange 18 at the upper end of the sleeve 8 are fixed by mutual tightening.

The high temperature stock solution flowing from the supply pipe 11 into the dropping nozzle 6 is dropped into the granulating tower 1 through each hole of the perforated plate 9. The dropped droplets are cooled in contact with the cooling gas blown from below while falling inside the granulation tower 1, and are solidified by the time they reach the product take-out port 2 at the lower end of the granulation tower 1 and have a substantially spherical shape. Becomes a granular body.

Now, in order to increase the processing capacity, the number of dropping holes provided in the perforated plate 9 must be increased correspondingly. For that purpose, the surface of one dropping nozzle 6 facing the inside of the granulation tower 1, that is, the surface area of the porous plate 9 must be increased. Then, the amount of heat taken by the cooling gas from the surface of the perforated plate 9 becomes large, and it becomes difficult to maintain the molten state of the stock solution in the dropping nozzle 6 only by heating with the heat medium from the side wall of the dropping nozzle 6. Therefore, in the present invention, by interposing a sleeve 8 having a steam jacket at the attachment portion of the dropping nozzle 6 to the ceiling of the granulation tower 1,
The surface of the perforated plate 9 is located further above the inner surface of the ceiling 4 of the granulation tower 1. This makes it difficult for the surface of the perforated plate 9 to come into direct contact with the cooling gas, and because the support 15 and the sleeve 8 are heated by the heat medium, the surface of the perforated plate 9 is not overcooled. Suppressed.

On the other hand, the gate valve 14 is designed to be opened and closed manually or by a drive actuator (not shown). During normal operation, the gate valve 14 is opened to allow the liquid droplets to drop from the dropping nozzle 6 into the granulating tower 1. If necessary, the gate valve 14 is closed to drop the dropping nozzle 6 concerned. Can be completely cut from the granulation tower 1.
Therefore, it is possible to individually inspect and replace the desired dropping nozzle 6 without stopping the dropping from the other dropping nozzles 6.

[0019]

As described above, according to the present invention, since the surface of the dropping nozzle is less likely to be directly exposed to the cooling gas, the supercooling of the surface of the dropping nozzle is suppressed. Moreover, since the sliding gate valve can cut off the gap between the granulating tower and the dropping nozzle, the dropping nozzle can be individually maintained without interrupting the operation of the granulating equipment. Therefore,
It is possible to increase the capacity per drop nozzle and improve the maintainability.

[Brief description of drawings]

FIG. 1 is a schematic overall view of a granulation tower to which the present invention is applied.

FIG. 2 is an enlarged sectional view of a dropping nozzle portion.

[Explanation of symbols]

 1 Granulation Tower 2 Product Outlet 3 Cooling Gas Supply 4 Ceiling 5 Cooling Gas Discharge 6 Dropping Nozzle 7 Axial Extension 8 Sleeve 9 Perforated Plate 10 Shell 11 Supply Pipe 12 ・ 13 Void 14 Gate Valve 15 Support 16 Valve body 17 ・ 18 Flange

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

Claims (2)

[Claims] 1. A dropping nozzle for a countercurrent type granulation equipment, which produces a granular material by dropping a high temperature molten liquid and bringing it into contact with a cooling gas flowing in a granulation tower, said dropping nozzle A dropping nozzle of a countercurrent type granulation equipment, wherein the nozzle is attached to the ceiling of the granulation tower via a sleeve. 2. The dropping nozzle is attachable to and detachable from the sleeve, and a slide type gate valve is provided on the sleeve at a downstream side of the dropping nozzle. Dropping nozzle of the countercurrent granulation equipment described.