JPH03261478A - Heat treatment device for granular body - Google Patents

Abstract

PURPOSE:To obtain the heat treatment device for a granular body which can execute easily the heating adjustment by providing a cylindrical container in which a granular body supply port and a granular body discharge port are provided on one of the end parts and the other, respectively, a hollow rotation shaft which is inserted into the container and through which vapor is conducted, plural pieces of feed blades attached to the rotation shaft, and a vapor exhaust nozzle. CONSTITUTION:On one of the end parts of a clyindrical container 1 of the heat treatment device, and the other, a granular body supply port 3 and a granular body discharge port 5 are provided, respectively, a steam supply piping 9 for supplying vapor to a hollow rotation shaft 2 is provided on the end face of the cylindrical container 1, and a piping 11 discharges condensed water, etc. On the hollow rotation shaft 2, supports 6 are provided vertically and radially, and to each of the supports 6, a feed blade 4 is attached through a fitting tool 21, and also, a steam injection nozzle 8 is provided. The feed blade 4 is a plate-like body attached to the hollow rotation shaft 2 by being inclined at an inclination angle theta, and feeds a granular body in the direction as indicated with an arrow P, while stirring and raising it. At the time of heat treatment for the granular body, an inclination angle thetaof the fed blades 4... is adjusted with in a range of 0 deg.-90 deg. in accordance with a purpose and a characteristic of the heat treatment for the granular body.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a heat treatment apparatus for powder and granular materials.

(Prior Art) In powders and granules used for food products such as wheat flour, cosmetics, etc., the number of germs in the powders may become a problem.

For this reason, powder and granules are sometimes heat-treated and sterilized before being shipped as products.

By the way, in order to uniformly heat-treat the granular material, it is necessary to heat-treat the granular material while sufficiently dispersing it.

As an apparatus used for such heat treatment, one that performs heat treatment while dispersing powder particles using a mixed fluid of air and steam has conventionally been used.

(Problems to be Solved by the Invention) According to the conventional powder heating device, it is possible to perform heat treatment while dispersing the powder.

However, in the conventional mixed fluid of air and water vapor,
Since it is difficult to adjust heat treatment conditions such as heating temperature, heat treatment time, and residence time, the quality of the powder and granules obtained after heat treatment may change and the commercial value may decrease significantly.

Furthermore, since it is necessary to use a large amount of non-condensable fluid such as air to disperse the powder, the apparatus has the drawback of being large and extremely expensive.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a compact heat treatment apparatus for powder and granular materials, which allows easy adjustment of heat treatment conditions.

(Means for Solving the Problems) As a result of intensive studies to achieve the above object, the inventors of the present invention have discovered that air, etc. The present invention was achieved by discovering that it is possible to disperse powder and granular material while bringing it into contact with water vapor without using a non-condensable fluid.

That is, the present invention provides a heat treatment apparatus for heat-treating powder and granular materials with water vapor, in which the device is provided with a powder supply port at one of both ends, and a powder and granule discharge port at the other end. A cylindrical container is provided, a hollow rotating shaft inserted into the container and provided with a hollow part in the longitudinal direction through which water vapor is conducted; , a plurality of sending blades installed in the longitudinal direction of the rotating shaft so as to be able to send the powder and granular material from the powder and granular material supply port toward the powder and granular material discharge port, and provided in the longitudinal direction of the hollow rotating shaft, The heat treatment apparatus for powder and granular material is characterized in that it is equipped with a plurality of steam jetting nozzles connected to the hollow part of the hollow rotating shaft and spouting steam into the cylindrical container.

In the present invention, it is preferable that the plate-shaped body serving as the feeder blade is attached to a support that is erected substantially perpendicularly to the outer wall surface of the hollow rotating shaft so that its inclination angle with respect to the rotating shaft can be adjusted. Heat treatment conditions such as residence time of the particles can be easily adjusted.

(Function) According to the present invention, the granular material supplied to the cylindrical container is sent toward the granular material discharge port while being scraped up by the plurality of sending blades.

On the other hand, the water vapor that is conducted into the hollow part of the hollow rotating shaft to which each of the feeding blades is attached is ejected into the cylindrical container from the steam jet nozzle provided in the longitudinal direction of the hollow rotating shaft, and the powder particles Heats the powder when it comes into contact with the body.

In particular, the powder and granules scraped up by the sending blades fall while being dispersed, so that good contact with water vapor is achieved.

Therefore, the heat treatment apparatus of the present invention uniformly heats powder and granules using only water vapor, which is a condensable fluid with excellent heat transfer properties, without using a non-condensable fluid such as air. can be applied.

Therefore, the apparatus can be downsized, and the heat treatment conditions can be easily adjusted by adjusting the rotational speed of the hollow rotating shaft, the pressure and amount of water vapor blown, and the like.

(Example) The present invention will be explained in further detail using the drawings.

FIG. 1 is a front view showing an embodiment of the heat treatment apparatus according to the present invention, in which a horizontal cylindrical container 1 is supported by support members 19.

A powder supply port 3 for supplying powder and granules is provided at one end of the cylindrical container 1, and a powder discharge port for discharging heat-treated powder and granules is provided at the other end. 5 is provided.

Further, a hollow rotating shaft, which will be described later, is inserted into the cylindrical container l, and a steam supply pipe 9 for supplying water vapor into the hollow part of the hollow rotating shaft is connected to the end surface of the cylindrical container 1 on the powder supply port 3 side. It is arranged.

The pipe 11 provided on the side of the powder discharge port 5 is used as a pipe for discharging condensed water of water vapor accumulated in the hollow part of the hollow rotating shaft at the time of starting operation, etc.

Further, above the powder discharge port 5, a steam discharge port 7 is provided through which water vapor ejected into the cylindrical container 1 is discharged.

As shown in FIG. 2, the heat treatment apparatus shown in FIG. There is.

FIG. 2 is a cross-sectional view taken along the X-X plane of the apparatus shown in FIG. inserted along the longitudinal direction.

Hollow portion 1 formed in the longitudinal direction of this hollow rotating shaft 2
0 is supplied with water vapor from a water vapor supply pipe 9 shown in FIG.

On the outer wall surface of the hollow rotating shaft 2, struts 6 are radially erected substantially perpendicularly to the hollow rotating shaft 2.

A plate-like sending blade 4 is attached to the tip of each of the supports 6 via a fitting 21, and a steam injection nozzle 8 is provided directly below the fitting 21.

The steam injection nozzle 8 is provided in the support column 6 and the plug 23
It is connected to the hollow part 10 of the hollow rotary shaft 2 via a conductive path (not shown) whose tip is sealed by a cylindrical container, and the water vapor conducted through the hollow part 10 can be injected into the cylindrical container 1. can.

The struts 6, to which the feed blades 4 and the steam injection nozzles 8 are attached, are provided in the longitudinal direction of the hollow rotating shaft 2, as shown in FIG.

As shown in FIG. 3, the feed blade 4 used in this example is a plate-shaped body attached at an angle of inclination θ with respect to the hollow rotating shaft 2, so it scrapes up the powder and granules. It can be sent in the direction of arrow P.

The amount of raking up of the powder and the feeding speed by the feeder blades 4 vary depending on the inclination angle θ of the feeder blades 4 with respect to the hollow rotating shaft 2, and are determined as appropriate depending on the characteristics of the powder and granular material to be heat-treated. It is to be determined.

In this regard, in this embodiment, the feed blades 4...
It is attached to...

That is, the sending blade 4 is attached to the tip of the support column 6 via the fitting 21, and this fitting 21 is attached to the tip of the column 6 with screws 25.

Therefore, by loosening the screws 25..., the feed blade 4
The inclination angle θ can be changed arbitrarily.

Here, the inclination angle θ of the feed blade 4 with respect to the hollow rotating shaft 2 is 0.
°), the amount of raking of the granular material can be maximized, but the amount of feeding of the granular material becomes 0.

On the other hand, the feed blade 4 is perpendicular to the hollow rotating shaft 2 (inclination angle θ
is 90°), both the amount of scraping and the amount of feeding of the granular material are 0.

For this reason, when heat treating powder or granules, the inclination angle θ of the feed blades 4 is set between 0° and 9° depending on the purpose and characteristics of the heat treatment of the powder and granules.
Adjust within the range of 0°.

In adjusting the inclination angle θ, the inclination angle θ of each of the feed blades 4 may be set to the same angle, and the inclination angle θ may be adjusted for each feed blade 4.
may be adjusted differently.

Incidentally, the inclination angle θ of the sending blades 4 can be adjusted by loosening the tightening screw 13 of the cylindrical container 1 and releasing the upper part of the cylindrical container 1.

Further, water vapor is injected in the direction of arrow B from the water vapor injection nozzles 8 provided on each of the pillars 6.

The injection direction of this water vapor is opposite to the moving direction of the powder (direction of arrow P).

This is to ensure good contact between the powder and the water vapor.

Some of the water vapor injection nozzles 8 may be provided with a cap at the tip to prevent the water vapor from being ejected, in order to adjust the area to be sprayed, the amount of water vapor, etc.

In the heat treatment apparatus of this embodiment, the powder and granules fed through the powder and granule supply port 3 (not shown in FIG. The powder is sent in the direction of the powder discharge port 5.

Since the scraped powder particles fall while being dispersed, they come into contact with the steam injected from the steam injection nozzles 8 into the cylindrical container 1, are uniformly heated, and are subjected to heat treatment.

The steam injected here may be saturated steam or heated steam.

Further, by scraping and frying the powder or granules, the powder or granules can be mixed uniformly, and the powder or granules can be uniformly heat-treated.

The powder and granular material heat-treated in this manner is transferred to the granular material discharge port 5.
and is further sent to a drying process, etc., if necessary.

Incidentally, the surplus steam injected from the steam injection nozzle 8 is discharged from a steam discharge lower provided at the end of the cylindrical container 1 on the powder discharge port 5 side.

In the heat treatment apparatus of this embodiment, the rotation speed of the hollow rotary shaft 2, the water vapor pressure, the amount of water vapor injected into the cylindrical container 1, etc. can be adjusted without adjusting the inclination angle θ of the feed blades 4, or the powder A desired heat treatment can be achieved by adjusting the amount of granules supplied.

The heat treatment apparatus of this embodiment is constructed of a member made of stainless steel in order to be used for the purpose of heating and sterilizing foodstuffs such as buckwheat flour.

The heat treatment apparatus of this example was used to sterilize buckwheat flour, and the number of bacteria in the resulting buckwheat flour is shown below.

In addition, the buckwheat flour supplied as a raw material here has a moisture content of 12.4
*lt%, white charcoal 7.3, coliform count 6.8 x 10',
The general viable cell count was 6.3 x 10'.

In the above table, each of No. 1 to No. 2 and No. 2 to No.

No problems occur during the heat treatment, and buckwheat flour with a significantly reduced number of bacteria can be obtained.

Furthermore, buckwheat flour of a desired color can be obtained by adjusting the temperature inside the container.

(2) The rotation speed of the hollow rotary shaft 2 was adjusted so that the residence time was constant even in the heat treatment condition table at a water vapor pressure of 0.5 KG/J (gauge pressure). water vapor pressure 03 a=
Almost the same results as in the case of heat treatment (gauge pressure) were obtained.

In this example described above, an example was shown in which the heat treatment apparatus of this example was used for heat treatment of buckwheat flour. Alternatively, it can be used for heat treatment to heat starch to pregelatinize it.

Further, the heating device of this embodiment can also be used to heat-treat grains such as buckwheat grains and wheat grains to gelatinize them.

Furthermore, the heat treatment apparatus of this embodiment can be used not only in the field of foodstuffs but also in the field of cosmetics and the like, as a heating apparatus for sterilizing powder and granules used in cosmetics.

(Effects of the Invention) According to the apparatus for heat treatment of powder or granular material of the present invention, the apparatus can be downsized and the heat treatment conditions can be easily changed. It can be used as a heating device for various powder and granular materials.

[Brief explanation of drawings]

FIG. 1 is a front view showing one embodiment of the present invention, and FIG. 2 is a front view showing one embodiment of the present invention.
FIG. 3 shows a cross-sectional view along the XX plane in the figure, and FIG. 3 shows a partial front view of the hollow rotating shaft. In the figure, 1... Cylindrical container, 2... Hollow rotating shaft, 3... Powder supply port, 4... Feeding blade, 5... Powder discharge port, 6
... Strut, 7... Steam outlet, 8... Steam jet nozzle, 9... Steam supply piping, 10... Hollow part, 21...
・Mounting tool, 25...screw, θ...angle of inclination.

Claims (1)

[Scope of Claims] 1. A heat treatment device for heat-treating powder and granular material with steam, the device is provided with a powder supply port at one of both ends and a powder and granular material discharge port at the other end. a cylindrical container provided with an outlet; a hollow rotating shaft inserted into the container and provided with a hollow part in the longitudinal direction through which water vapor is conducted; In addition, a plurality of sending blades are installed in the longitudinal direction of the rotary shaft so as to be able to send the powder and granular material toward the powder and granular material discharge port; 1. A heat treatment apparatus for powder and granular material, characterized in that the apparatus is equipped with a plurality of steam jetting nozzles that are connected to a hollow part and jet steam into a cylindrical container. 2. Claim 1, wherein the feeder blade is a plate-shaped body attached to the tip of a support that stands substantially perpendicular to the outer wall surface of the hollow rotating shaft so that its inclination angle with respect to the rotating shaft can be adjusted. The apparatus for heat treatment of powder or granular material described above.