JPS59100383A - Drier for superheated steam - 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 The present invention is characterized in that an air permeable drying object conveyor such as a net bunveyor penetrates the inside of a drying chamber, and
In Quiz's superheated steam drying equipment, which performs drying by blowing superheated steam downward, a large amount of air enters the drying room from the outside near the transportation entrance and exit of the drying room due to the installation of an air mixture suppression device. The present invention relates to a superheated steam drying device that can effectively prevent contamination.

The superheated steam drying method has great advantages over other drying methods such as hot air drying in that it improves drying efficiency, increases the degree of swelling (porosity) of dried products, and allows for uniform drying. Regarding the drying method, when drying gravel is carried out using the drying apparatus of the above-mentioned aspect, a large amount of air gets mixed into the drying chamber near the transportation entrance and exit, which inhibits the effects peculiar to the superheated steam drying. It was also inherited by

One possible measure to prevent this air from entering the drying chamber is to supply a larger amount of water vapor than necessary into the drying chamber □, to the extent that the water vapor blows out of the drying chamber near the entrance and exit of the carrier. There is also a problem in terms of economy, and in addition, the water vapor ejected outside the drying chamber condenses on the surface of the dried product, resulting in a deterioration in the quality of the dried product.

Also, as a means to prevent air from entering the air, it is possible to install an air locker at the entrance and exit of the carrier, but this poses a problem in terms of operating efficiency of the carrier.

In view of this current situation, without having the above defects,
Furthermore, the superheated steam drying device of the present invention has been devised as a drying device that can carry out superheated steam drying while effectively suppressing the intrusion of air into the drying chamber.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

In the figure, (la) to (ld,) are superheated steam drying chambers through which a drying material conveyor (2) with notification properties such as a net conveyor passes through, and is connected to a concave chamber by a partition wall (3). It is compartmentalized.

Additionally, a heater (not shown) and a proa (not shown) are installed inside the drying room, and water vapor is supplied to each drying room. ,
Superheated steam is internally circulated alternately in each chamber so that the superheated steam is blown onto the drying object carrier (2) in the illustrated wind direction.

Such a measure of reversing the direction of blowing superheated steam is an effective measure for eliminating uneven drying of the material to be dried.

The method of conveying the material to be dried by the material to be dried (2) may be either a method in which the material to be dried is placed directly on it, or a method in which a porous metal shaft retainer is mounted on the carrier.
Further, a conveyor such as a net conveyor having air permeability may be separately installed along and above the conveyor to function as a restraining conveyor.

Next, (4) in the figure is an air entrainment suppressing device provided adjacent to the drying chamber (la) at the conveyance body entrance at the starting end of the drying chamber (la). As shown in the figure, the suppression device (4)
It has a box-like shape that passes through it, and an exhaust duct (5) is connected to the leeward side of the adjacent drying and handling room (LA), that is, the E side with respect to the carrier (2). The exhaust duct (5) joins the exhaust duct from the air control device at the end of the drying chamber via the suction force adjustment damper (6),
It is connected to an exhaust fan (7).

Further, (8) in the figure is also an air entrainment suppressing device installed at the conveyor outlet at the end of the drying chamber (1 cL), adjacent to the co-rotation/concentration chamber.

Similar to the suppression device (4), the suppression device (8) also has a box-like shape through which the conveyor (2) passes, and is located on the leeward side of the adjacent drying chamber (1d), i.e. Suppressor (8)
In this case, contrary to (4), an exhaust duct (9) is connected to the lower side of the conveyor (2), and the duct is connected to the exhaust duct (9) via a suction force adjustment damper (6). It merges with #lIkifan (7) and continues with #lIkifan (7).

Next, the functions of the drying device of the present invention will be explained.

As shown in the example, an internal circulation type r is used which performs drying by blowing wind in the vertical direction on the conveyor (2).
In the 1E explosion chamber, ventilation is obstructed by the presence of the conveyor and the material to be dried, so the wind J: m11 becomes positive and swollen with respect to 2) on the conveyor as shown in the figure, while the leeward side is in a negative pressure state. I fall early.

Furthermore, the air entrainment suppression devices (4) and (8) of the present invention have exhaust ducts (5) and (9) on the leeward side of the adjacent dryers.
The system has a forced exhaust mechanism consisting of an exhaust fan (7) and an exhaust fan (7).
), (Id ) and the same pressure distribution is exhibited for the same carrier.

Therefore, there is no movement of air or superheated steam through the vicinity of the transport entrance and exit of the drying chamber in the upper or lower part of the transport body (2), and as a result, the air entrainment suppression device (4)
The air that has entered (8) through the vicinity of the transport entrance and exit of the apparatus is discharged through the exhaust ducts 5) and (9) without entering the drying chamber.

Furthermore, the same suppression device for superheated steam in the drying room (4), (8)
) can be suppressed to a minimum, energy loss does not occur, and superheated steam does not leak to the outside.

The suction power adjustment damper (6) is a device for adjusting the suction power of the exhaust fan (7), and depending on the type of material to be dried, a small amount of air may be mixed in during superheated steam drying. , @j: There are cases where it is preferable to prevent the deformation of dry goods, and in such cases, the same adjustment gunbar (
6), it is also possible to reduce the suction force and intentionally mix a predetermined amount of air into the drying chamber.

On the other hand, as shown in the comparative example in Figure 2, in the case of a drying device in which the exhaust duct of the air entrainment suppression device is connected to the rice field side of the adjacent drying room, the distribution of children through the conveyor (2) is ,
The drying chamber and the inside of the suppressor are completely opposite, and as a result, as shown by the arrow, a large amount of air enters the drying chamber along the conveyor at the entrance and exit of the suppressor. In addition to being mixed in, a large amount of superheated steam in the drying chamber also flows into the suppression device and is discharged through the exhaust pulp, resulting in energy loss.

As described above, the superheated steam drying apparatus of the present invention effectively prevents a large amount of air from entering the superheated steam drying chamber from outside by installing the air entrainment suppressing device without causing any energy loss or reduction in the operating efficiency of the conveyor. It is possible to carry out superheated steam drying that can be carried out satisfactorily, and the advantages of the same drying method can be maximized.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of an embodiment of the present invention. FIG. 2 is a partially cutaway schematic cross-sectional view of the opposite side.

Claims (1)

[Claims] A drying device that performs drying by blowing superheated steam vertically onto a conveyor to be dried that has air permeability through the drying chamber.At the entrance and exit of the conveyor, there is a 1. A superheated fish air-drying and blooming device, characterized in that it has an exhaust mechanism and is further provided with a box-shaped air mixture suppression device through which the conveying body passes.