JPS61138081A - Ventilation combination type rotary drier with steam pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a rotary dryer with a steam pipe and an aeration type that is most suitable for drying coal, powdered chemical products, and the like.

[Prior art]

Conventionally, a rotary dryer with a single trachea used for drying coal and other materials to be dried is shown in the side sectional view in Fig. 4 and in Fig. 5.
As shown in the front sectional view of the figure, steam S or hot water is sent from a steam port 3 to a large number of steam pipes 2 passing through a rotating drum 1 through a pressure rotary joint 9, and this is used as a heat source to dry the material. Heat is transferred from the material 4 to the material to be dried M supplied by a feeder 5 provided around the rotating shaft of the drum 1, and the moisture evaporated there is introduced from a carrier gas 6 provided around the feeder 5. The carrier gas G such as air is exhausted to the outside of the system from the carrier gas output lower part.

The dried material M dried in the above manner is taken out from the dry product outlet 8', and the steam S as the heating medium circulates in the steam pipe 2 and then passes through the pressure rotary joint 9 again to the drain outlet 10. It is designed to be discharged.

Further, this drum 1 is rotated in the direction of arrow R via tires 12 by a roller 11 rotated by a drive device (not shown).

However, in the above-mentioned conventional rotary dryer, the carrier gas G only flows over the upper surface of the material to be dried M, and the evaporation surface area of the material to be dried M is small, and the humidity of the carrier gas G increases from the inlet to the outlet. There is a disadvantage that evaporation is slow due to the increase in height, and furthermore, the steam pipe 2
There was also the problem of corrosion due to moisture.

On the other hand, a rotary fluid dryer is equipped with a louver that feeds hot gas from below into the cylindrical rotating body, and the hot gas passes through the wet material supplied into the rotating body to fluidize and dry the wet material. There has also been an invention disclosed in JP-A-58-156179 in which heat transfer tubes for heat medium such as steam are disposed inside the body, but in this case, the structure becomes complicated due to the provision of louvers.
In addition, there was a problem in that it was not possible to install a large number of heat transfer tubes, and since the hot gas from the louvers was the main heat source for drying, a large amount of hot gas was required, resulting in high operating costs. .

[Purpose of the invention]

Therefore, the present invention solves the above-mentioned conventional problems, and by introducing a carrier gas from the lower part of the material to be dried in the drum, allows air drying to be performed in combination with drying using a steam pipe,
It is an object of the present invention to provide a rotary dryer with a steam pipe, which is combined with ventilation and has a simple structure, is compact, and has a low operating cost, while increasing the drying speed.

[Structure of the invention]

That is, the rotary dryer with a steam pipe of the present invention is a rotary dryer with a steam pipe that uses a steam pipe penetrating through a rotating drum as a heat source. It is configured by introducing.

〔Example〕

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a side sectional view of a rotary dryer with steam pipes in Embodiment 1 of the present invention, and FIG. 2 is a front sectional view of FIG. 1. The rotary dryer with a steam pipe according to the first embodiment has almost the same construction as that of the conventional example shown in FIG. 4, and the same parts are indicated by the same numbers.

That is, it is a rotary dryer with steam pipes in which the drum 1 rotates in the direction of arrow R, using steam S or hot water passing through a large number of steam pipes 2 penetrating a rotating drum 1 as a heat source, and the drying material M The flow of , the flow of steam S, etc. are the same as in the conventional example shown in FIG. 4, so a description thereof will be omitted.

Therefore, in the present invention, as shown in FIG. ,
That is, the carrier gas inlet 6 is provided so that the carrier gas G, which is drying air, is introduced into these gas introduction pipes 13 when the carrier gas G reaches the drying air introduction section shown as A in FIG.

Note that this gas introduction pipe 13 is designed so that the carrier gas G is introduced from this gas introduction pipe 13 into the material M to be dried.
is provided with a large number of holes 14A as shown in FIG. 3-A, and the structure of the gas introduction pipe 13 for introducing the carrier gas G into the material to be dried M is the round pipe shape of the above embodiment. However, the present invention is not limited to the above, and the semi-cylindrical gas introduction pipe 13A may be provided directly on the inner peripheral surface of the drum 1 as in the second embodiment shown in Fig. 3-B, or the third embodiment shown in Fig. 3-C. As shown, the gas introduction pipe 1 is partitioned into a drum 1 as a double cylinder.
3B may be provided.

Further, although the carrier gas 6 is provided on the side of the dried product outlet 8, it may be provided on the side of the material to be dried 4.

In the rotary dryer with a steam pipe and ventilation combined with the above configuration of the present invention, the drying material M is mainly dried by heat transfer from the steam pipe 2, and the carrier gas G is further supplied to the drying material M. Since ventilation drying can also be used by introducing air from the bottom, the evaporation surface area becomes larger and drying efficiency increases.

In addition, a rotary dryer with a steam pipe is characterized in that the amount of carrier gas G used as drying air is small, and the present invention makes use of this characteristic while increasing the drying speed. You can also make your dryer more compact.

〔Effect of the invention〕

Therefore, in the rotary dryer with a steam pipe of the present invention, a carrier gas such as drying air is directly introduced into the material to be dried for ventilation, so it is possible to bring it into contact with low-humidity air over the entire drying area, thereby drying the material. It has the effect of increasing speed.

For this reason, it has the advantage of being much more compact than conventional rotary dryers with steam pipes.

In addition, the dryness of the product to be dried can reach a low moisture range, and the humidity on the surface of the steam pipe is maintained below the dew point, which improves the corrosion problem caused by moisture in the steam pipe. Moreover, the structure is simpler than that provided with a louver that feeds hot gas from below, and the amount of carrier gas introduced can be small, resulting in lower operating costs.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a rotary dryer with steam pipes in Embodiment 1 of the present invention, and FIG. 2 is a front sectional view of FIG.
Figure A is an enlarged front sectional view of the gas introduction pipe in Figure 2, and Figure 3-B
Figures 3-C and 3-C are front sectional views of gas introduction pipes in other different embodiments, and Figure 3-B shows embodiment 2,
FIG. 3-C shows a third embodiment, FIG. 4 is a side sectional view of a conventional rotary dryer with steam pipes, and FIG. 5 is a front sectional view of FIG. 4. DESCRIPTION OF SYMBOLS 1... Drum, 2... Steam pipe, 6... Carrier gas inlet, 11... Roller, 13... Gas introduction pipe, G... Carrier gas, M... Material to be dried , S...
·vapor.

Claims (1)

[Claims] A rotary dryer with a steam pipe that uses a steam pipe extending through a rotating drum as a heat source, and is characterized in that a carrier gas is introduced from the lower part of the material to be dried in the drum. .