JPS632874Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a steam tube bundle type rotary dryer that can be used, for example, to dry powder such as food or resin.

A conventional steam tube bundle type rotary dryer, which is mainly used for drying powder related to resins such as polyethylene, is rotatably supported by a support unit 1, as shown in FIG. A large number of heating tubes 4 are installed in the cylindrical cell body 3 that is rotated in the direction, and a steam inlet 5 is connected to the heating tubes 4.
By supplying the wet powder raw material M from the screw feeder 6, the powder raw material M is introduced inside the heating tube 4, and the angle θ of the cell body 3 is Arrow M due to inclination
The powder raw material M is dried by the heat of the steam S while moving in the direction, and is taken out as a dry product from the product outlet 13, and the evaporated gas dried from the powder raw material M is discharged from the screw feeder 6.

However, in the above dryer, the cell body 3
The wet powder raw material M tends to adhere between the cell body 3 and the heating tube 4 on the inlet side of the cell, resulting in insufficient heat transfer area and poor drying. However, in this case, the dryer was deformed and various damages occurred.

In addition, other measures have been taken, such as providing a trace tube outside the cell body 3 or reducing the number of heating tubes 4, but none of these measures have been effective at present.

Therefore, the present invention has been devised for the purpose of preventing the adhesion of wet powder raw materials to the steam tube bundle type rotary dryer as described above.

That is, the steam tube bundle type rotary dryer of the present invention is a steam tube bundle type rotary dryer in which a heating tube for introducing steam is provided inside a rotating cell body. It is constructed by providing a steam jacket that is heated by steam introduced into the tube.

An embodiment of the present invention will be described below with reference to the drawings. Fig. 2 is a side sectional view of the main part of a steam tube bundle type rotary dryer according to an embodiment of the invention, and is almost the same as the conventional example shown in Fig. 1. They have similar configurations and functions, and the same parts are indicated by the same part numbers. A steam jacket 7 is provided on the outside of the steam jacket.

This steam jacket 7 is supplied with steam S which is branched from the bend header 8 of the heating tube 4 and introduced into the heating tube 4, so the steam jacket 7 is heated and the cell body 3 is heated by this steam jacket. 7, and even if the wet powder raw material M comes into contact with such a heated surface, the moisture evaporates instantaneously and becomes difficult to adhere to.

This steam jacket 7 is partitioned from the inlet side of the steam S to the outlet side by a partition plate 10 having holes 9 as shown in the enlarged sectional view of FIG. Then, all of the generated drain passes through the hole 9 of the partition plate 10 and accumulates on the outlet side, and further flows out to the drain outlet 11 by the partition plate 12 provided in the rotation direction R shown in FIG. There is.

The drain discharged from the drain outlet 11 is sent to the cell body 3.
Due to the action of the spiral tube 15 along the outer periphery of
As the cell body 3 rotates, the drain returns to the bend header 8, and by returning the drain to the heating tube 4 through a partition provided in the bend header 8, it is discharged from the drain outlet 14 together with the drain in the heating tube 4. ing.

That is, this spiral pipe 15 is formed so that when it rotates together with the cell body 3, the drain from the drain outlet 11 is lifted toward the bend header 8 side.

Therefore, in the steam tube bundle type rotary dryer of the present invention,
By providing a steam jacket in areas where wet powder raw materials tend to adhere, the cell can be completely heated to completely prevent wet raw materials from adhering.
There is no need to install a hammering device, etc., and the heat transfer area increases by providing a steam jacket, so there is an advantage that the performance of the dryer is greatly improved.

After all, the present invention is related to a steam tube bundle type rotary dryer, and is based on steam heating using a steam tube bundle installed inside the rotary dryer, and furthermore, the heated steam is further heated by installing a steam tube bundle outside the raw material inlet side. Since the wet powder raw material can be heated on the inlet side of the dryer main body by introducing it into the pipe, it not only prevents the raw material from sticking, but also heats the wet powder raw material on the inlet side of the rotary dryer main body. By connecting the drain outlet provided at the end of the bucket and the heating tube with a spiral tube, the drain was discharged, and as a result, steam could be used effectively in the rotary dryer.

In other words, the present invention efficiently dries food and resin powder by using a configuration in which both the inside and outside of the rotary dryer body are heated by the same steam, and the resulting condensate is easily discharged. It became possible to do so.

Although the above description has been made regarding the case of drying resin, the present invention is not limited to this, and can be widely used for drying foods and other items.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a conventional steam tube bundle type rotary dryer, FIG. 2 is a side sectional view of main parts of a steam tube bundle type rotary dryer according to an embodiment of the present invention, and FIG. FIG. 4 is an enlarged sectional view of the main part of the jacket, and is a sectional view taken in the - direction of FIG. 3. 3...Cell body, 4...Heating tube, 5...Steam inlet, 6...Screw feeder, 7...Steam jacket, M...Powder raw material, S...Steam.

Claims (1)

[Scope of utility model registration request] In a steam tube bundle type rotary dryer in which a heating tube for introducing steam is installed inside a rotating cell body, a steam jacket heated by the steam introduced into the heating tube is installed on the outside of the raw material inlet side of the cell body. A steam tube bundle type rotary dryer characterized in that a drain outlet provided at the end of a steam jacket and a heating tube are connected by a spiral tube to discharge drain.