JP4088893B2 - Powder dryer and powder dryer - Google Patents

Description

The present invention relates to a powder dryer and a powder dryer used for drying powder such as okara discharged from a tofu manufacturing process.

Conventionally, it comprises an outer cylinder, a spiral hot air passage formed on the inner periphery of the outer cylinder, and an inner cylinder covering the inside of the spiral hot air passage, and a powder supply path and hot air blowing are provided at the lower end of the spiral hot air passage. There is provided a powder dryer in communication with a path and a dry powder take-out path in communication with the upper end of the spiral hot air path.
In the powder dryer, hot air and powder are blown from the lower end of the spiral hot air passage, the powder and hot air are spirally raised in the spiral hot air passage, and the powder is dried in the meantime. The dry powder is taken out from the take-out path at the upper end of the spiral hot air path.

At this time, the passage time of the powder in the spiral hot air passage is substantially constant for a predetermined hot air blowing speed. For example, in the case of okara, the moisture content before drying varies in the range of 70% to 85% by mass. When powder with such a variation in moisture content passes through the spiral hot air passage for a certain passage time and is dried, the moisture content of the powder after drying due to variations in the moisture content of the powder before drying. The amount varies and it is difficult to obtain a dry powder having a constant water content.
Japanese Patent Application No.35-31632 Japanese Patent Application No.35-31633

  The problem to be solved is to convert a material to be dried having a variation in moisture content into a dry powder having a certain moisture content.

The present invention provides, as means for solving the above-described conventional problems, an outer cylinder (2), an inner cylinder (3), and a spiral hot air provided between the outer cylinder (2) and the inner cylinder (3). The upper end of the inner cylinder (3) is lower than the upper end of the outer cylinder (2) to form a sorting chamber (6) therebetween, and the inner cylinder (3) is formed from the upper end. A funnel body (8) is inserted and communicates with a lower portion of the inner cylinder (3) and a hot air reservoir (11) formed by the funnel body (8).
The hot air generator (7) provided at the upper part of the outer cylinder (2) communicates with the hot air reservoir (11) at the lower part of the inner cylinder (3), and communicates with the lower part of the spiral hot air channel (5).
The lower part of the spiral hot air passage (5) communicates with the powder supply device (9) to be treated from the outside of the outer cylinder (2), and a dry powder take-out path (10) is provided at the upper end of the outer cylinder (2). From the contacting powder dryer (1) and the above powder dryer (1), and the powder accumulator (13) communicating to the powder take-out path (10) of the powder dryer (1) Thus, the powder accumulator (13) provides a powder drying device comprising a cyclone section (14) and a blower (12).

The powder to be treated and hot air are blown from the lower end of the spiral hot air passage (5) of the powder dryer (1). The powder spirally rises with hot air in the spiral hot air passage (5) and is dried, and reaches the sorting chamber (6) at the upper end of the outer cylinder (2). In the sorting chamber (6), the powder spirally rises due to the swirling updraft of the hot air discharged from the spiral hot air passage (5), but the powder containing a lot of moisture has a large specific gravity, so the powder in the sorting chamber (6) Stagnate or fall to the lower part of the funnel body and contact with the hot air blown out from the hot air chamber (11) to be further dried. Taken out. Therefore, the moisture content of the dry powder taken out can be made substantially constant.

  A dry powder with a constant moisture content can be obtained by installing a hot air generator in the dryer to efficiently dry wet powder with varying moisture content without using drive parts and with a small volume of equipment. be able to.

The present invention will be described with reference to an embodiment shown in FIG. 1. In the powder dryer (1) shown in the figure, (2) is an outer cylinder, (3) is an inner cylinder, and the outer cylinder (2 ) And the inner cylinder (3), a spiral plate (4) is interposed between the outer cylinder (2), the inner cylinder (3), and the spiral plate (4). A spiral hot air passage (5) is defined between 2) and the inner cylinder (3). The spiral plate (4) is inclined to the right as shown in FIG.
The upper end of the inner cylinder (3) is set lower than the upper end of the outer cylinder (2). In the outer cylinder (2), a sorting chamber (6) is formed above the inner cylinder (3). A funnel body (8) is inserted into the inner cylinder (2) from the upper end, and the lower end of the funnel body (8) communicates with the hot air chamber.
(7) is a hot air generator, the hot air generator (7) is in communication with the hot air reservoir (11), the hot air reservoir (11) is a spiral hot air path (5) of the powder dryer (1) ) Is in contact with the bottom edge. In the hot air generator (7), the fuel is burned by the burner (16), and the fuel is completely burned in the combustion chamber (19) surrounded by the hot air generator inner cylinder (18) and the wire mesh (21). A cold air intake (20) is installed in the upper part of the hot air generator outer cylinder (17). The cold air introduced from the cold air inlet (20) is heated by the hot air generator inner cylinder (18) and mixed with the hot air discharged from the combustion chamber (19) in the hot air mixing chamber (22) at 250 ° C. Generate hot air of ~ 400 ° C.
A powder feeder (9) to be processed communicates with the lower part of the spiral hot air passage (5) of the powder dryer (1) from the outside of the outer cylinder (2).

  A dry powder take-out path (10) is inserted tangentially to the upper end of the outer cylinder (2) and communicates with the upper end of the powder accumulator (13). The powder accumulator (13) comprises a cyclone section (14) and a blower (12).

  In the above configuration, when the powder to be processed is okara, hot air of 250 ° C. to 400 ° C. is sent from the hot air generator (7) to the hot air reservoir (11). The number of stages of the spiral hot air passage (5) is normally 10 to 20 stages. The hot air is supplied with the powder to be treated from the powder feeder (9) at the lower part of the spiral hot air passage (5), and the powder rises in the spiral hot air passage (5) together with the hot air as shown by the arrow in FIG. To the sorting room (6).

  In the sorting chamber (6), the powder is dried while swirling freely in the sorting chamber (6) as shown by the arrow in FIG. The powder containing a large amount of moisture and having a large specific gravity does not become a swirling updraft of hot air, and does not lose its ascending force, either stays in the sorting chamber (6) or falls to the lower part of the funnel (8), It is further dried by contact with hot air ejected from the lower part of the funnel body (8), and returned to the sorting chamber (6) again. Furthermore, while rotating in the sorting chamber (6), drying is promoted by receiving heat supplied from the hot air generator outer cylinder (17).

  Therefore, only the sufficiently dry powder is introduced into the take-out path (10) and fed into the powder accumulator (13). In the case of okara, the powder taken out to the take-out path (10) usually has a moisture content of about 5 to 10% by mass.

  Because it contains a lot of moisture, it can be used widely as fertilizer, feed, and foodstuffs by drying okara, etc. that could not be effectively used, thereby improving storage stability and transport efficiency.

It is sectional drawing which showed the implementation method of a powder dryer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Powder dryer 2 Outer cylinder 3 Inner cylinder 4 Spiral plate 5 Spiral hot air path 6 Sorting chamber 7 Hot air generator 8 Funnel body 9 Powder feeder 10 Dry powder take-out path 11 Hot air reservoir 12 Blower 13 Powder collector 14 Cyclone 15 Rotary valve 16 Burner 17 Hot air generator outer cylinder 18 Hot air generator inner cylinder 19 Combustion chamber 20 Cold air intake 21 Wire mesh 22 Hot air mixing chamber 23 Hot air conduction path

Claims (1)

It consists of an outer cylinder, an inner cylinder, and a spiral hot air passage provided between the outer cylinder and the inner cylinder, the upper end of the inner cylinder is lower than the upper end of the outer cylinder, and a sorting chamber is formed between them, A hot air generating device is provided at the upper part of the outer cylinder, the hot air conduction path communicates with the lower end of the spiral hot air path, and a powder supply device to be treated communicates with the lower part of the spiral hot air path from the outside of the outer cylinder. Has a dry powder take-out path in contact with the powder dryer

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