JPH0576333A - Rotary heat-treatment furnace for granule - Google Patents

Abstract

PURPOSE:To obtain the subject treating furnace having improved heat-transfer efficiency and enabling uniform and efficient roasting, etc., by placing a rotary mesh drum to hold granules such as peanuts and a hot-air blow-up apparatus to fluidize the granules in a furnace body having a heat-source fixed to the inner wall surface. CONSTITUTION:A granular material (e.g. peanuts and sesame) is transferred through a rotary mesh drum 2 under agitation while being roasted with the irradiation of heat from a heat source 3 such as far infrared heater. The granules on the bottom of the mesh drum 2 is moved by hot air blown from a hot-air blow-up apparatus 9 placed under the mesh drum 2 to improve the heat efficiency of the apparatus.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a rotary heat treatment furnace for granules suitable for roasting granular foods such as sesame and peanut.

[0002]

2. Description of the Related Art For roasting granular foods as described above, a granular material is supplied from the upper end of an inclined rotary drum and gradually moved to the outlet side while being stirred inside the rotary drum. A rotary heat treatment furnace is used in which combustion gas or hot air is blown inside to heat the granular material. However, such a conventional rotary heat treatment furnace has a drawback that uneven roasting is likely to occur, and a difference in roasting state between the surface and the inside of the granules easily occurs, and only the surface is likely to be overbaked.

Therefore, the inventors of the present invention rotatably provided a mesh drum for accommodating granular materials inside a furnace body having a heat source such as a far infrared heater attached to the inner surface thereof, so that sesame or peanut We have developed a rotary heat treatment furnace for granular particles that can be uniformly roasted without causing uneven roasting or overburning of the surface.
Filed under No. 296.

The rotary heat treatment furnace of this prior application has an advantage that far infrared rays are irradiated to the granular material through the mesh drum. However, since the far-infrared heater is mainly attached to the upper half of the furnace body to avoid dust falling from the mesh drum, it is not possible to irradiate far-infrared rays from the lower side of the mesh drum. However, since the granular material does not stir and flow in the lower part of the mesh drum, there are still unsatisfactory points in terms of heating efficiency.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems and provides a rotary heat treatment furnace for granules capable of uniformly roasting granules such as sesame and peanut with good heating efficiency. It has been completed to provide.

[0006]

[Means for Solving the Problems] The above-mentioned problems are rotatably provided with a reticulated drum for accommodating granular materials inside a furnace body having a heat source attached to the inner surface thereof, and reticulated below the reticulated drum. This can be solved by a rotary heat treatment furnace for granular particles, which is provided with a hot air blowing device that blows hot air toward the drum to flow the granular particles in the mesh drum.

[0007]

According to the rotary heat treatment furnace of the present invention, while the granular material moves while being stirred inside the rotating mesh drum, it is roasted by being irradiated with heat from a heat source such as a far infrared heater. Since the infrared rays pass through the mesh drum and reach the internal granules, it is possible to perform even roasting. If a far-infrared heater is used as a heat source, the far-infrared rays easily penetrate into the inside of the granules, so that the difference in the roasted state between the surface of the granules and the inside is reduced, and the surface is prevented from being overburned. .. Further, according to the rotary heat treatment furnace of the present invention, the hot air from the hot air blowing device provided on the lower side of the reticulated drum flows the granular material on the lower side of the reticulated drum to improve the heat transfer coefficient, so that the roasting can be performed with high thermal efficiency. Roasting can be performed, and dust can be removed by the sieving effect by blowing hot air.

[0008]

EXAMPLES Preferred examples of the present invention will be shown below. Figure 1
In FIG. 1, 1 is a substantially cylindrical furnace body, and 2 is a mesh drum rotatably supported inside the furnace body 1. A heat source 3 such as many far infrared heaters is attached to the inner surface of the upper half of the furnace body 1. As the heat source 3,
For example, a far infrared heater having a structure in which a heating wire is embedded inside a ceramic plate can be used, but hot air or any other heat source can also be used.

The mesh drum 2 is composed of a metal mesh having openings smaller than the diameter of the granular material, for example, about 1 mm, and both ends thereof are supported by rollers 4, 5 etc. in a fixed direction by a motor (not shown). Is rotated. A hopper 6 is provided on the inlet side for supplying the granules therein, and a chute 7 is provided on the outlet side for taking out the roasted granules. Further, as shown in FIG. 2, a large number of stirring plates 8 are evenly arranged inside the reticulated drum 2. The granular material supplied from the hopper 6 is transferred while being stirred by the stirring plate 8, and the chute 7
It is designed to be taken out from the.

Below the reticulated drum 2, a hot air blowing device 9 for ejecting hot air toward the reticulated drum 2 is provided over substantially the entire length. As shown in FIG. 2, the hot air blowing device 9 has an arcuate inner surface shape along the outer peripheral surface of the mesh drum 2 and has a large number of hot air injection holes. Then, hot air of about 200 to 300 ° C. is blown up toward the reticulated drum 2 to cause the granular material in the reticulated drum 2 to flow. The flow velocity of the hot air is preferably around 10 m / sec on the outer circumference of the mesh drum 2. If the flow velocity is higher than this, the particulate matter rises up from the stirring plate 8 and spills inside the reticulated drum 2, and the stirring effect is reduced, which is not preferable.

Reference numeral 10 denotes a screw conveyor installed in the lower portion of the furnace body 1, which quickly discharges the fall dust spilled from between the meshes of the mesh drum 2 to the lower portion of the furnace body 1 to the fall dust. This is for suppressing the generation of a bad odor due to the ignition of the above and the burning of the falling dust.

In the rotary heat treatment furnace of the present invention having the above-mentioned structure, while the reticulated drum 2 is continuously rotated, a granular material is supplied from the hopper 6 into the reticulated drum 2, and the reticulated drum 2 is agitated by the stirring plate 8 to disperse the granular material. Move the body toward the exit side while stirring. During this time, the heat source 3 provided in the upper half of the inside of the furnace body 1 passes through the mesh drum 2 to heat the granules therein to roast it. If a far-infrared heater is used as the heat source 3, it is easy to permeate the inside of the granular material, so that only the surface is not overbaked and uniform roasting is performed.

Further, as shown in FIG. 2, the granules in the lower part of the mesh drum 2 are brought into a fluidized state by the hot air from the hot air blowing device 9 and receive sufficient heat transfer from the lower side. Therefore, it is possible to obtain much higher heating efficiency than the rotary heat treatment furnace of the prior application. Moreover, dust such as debris mixed in the granular material is easily separated by the hot air from the hot air blowing device 9 and falls from between the meshes of the mesh drum 2. Then, it is discharged outside the furnace by the screw conveyor 10. Therefore, according to the present invention, not only the heating efficiency is improved, but also the dust separating effect can be enhanced.

[0014]

As described above, in the rotary heat treatment furnace of the present invention, the heat transfer efficiency is enhanced by blowing hot air, and the granules such as sesame and peanut are more uniformly and heated than the rotary heat treatment furnace of the previous application. It can be roasted efficiently, and dust can be removed by the sieving effect of blowing up hot air, and it contributes greatly to industrial development by eliminating the conventional problems.

[Brief description of drawings]

FIG. 1 is an axial sectional view illustrating an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along a direction perpendicular to an axis for explaining an embodiment of the present invention.

[Explanation of symbols]

 1 furnace body 2 reticulated drum 3 heat source 9 hot air blowing device

Claims (1)

[Claims] 1. A reticulated drum for accommodating granules is rotatably provided inside a furnace body having a heat source attached to its inner surface, and hot air is blown toward the reticulated drum below the reticulated drum. A rotary heat treatment furnace for granules, comprising a hot air blowing device for flowing the granules in a mesh drum.