JPH05157455A - Apparatus for heating - Google Patents

Abstract

PURPOSE:To obtain an apparatus which can heat substance uniformly with improved thermal efficiency even though the substance is small in bulk density and poor in heat conductivity. CONSTITUTION:A cylindrical heating barrel 11 having an inlet 12 through which substance is put and an outlet 13 for the heated substance is installed in a rotatable manner. A partition plate 21 projects in a spiral from the inner wall of the barrel 11. A heater 51 is mounted axially at the center of the barrel 11.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a heating device. Various heating devices are used for heat drying treatment of scrap powder, recovery of rare metals from steelmaking dust, surface reduction treatment of metal powder, and the like. The present invention relates to an improvement of such a heating device.

[0002]

2. Description of the Related Art Conventionally, a batch system, a roller hearth system, a mesh belt system and the like have been used as the above heating device. However, such a conventional heating device has a drawback in that it is difficult to uniformly heat an object to be processed such as scrap powder particles, steelmaking dust, and metal powder, and the thermal efficiency is poor. This is because the object to be processed originally has a low bulk density and poor heat conduction, but in the conventional heating device, the relative positional relationship between the heating element and the object to be processed is fixed.

[0003]

The problem to be solved by the present invention is that it is difficult for the conventional heating apparatus to uniformly heat the object to be processed, and the thermal efficiency is poor.

[0004]

SUMMARY OF THE INVENTION In the present invention, however, a cylindrical processing cylinder having an inlet for an object to be processed and an outlet for the object to be processed is rotatably installed. The present invention relates to a heating device characterized in that a partition plate is provided in a spiral shape on the peripheral surface, and a heating element is axially inserted in the central portion of the processing cylinder.

In the present invention, the processing cylinder is formed in a cylindrical shape and is rotatably installed, and the processing cylinder is provided with an inlet for an object to be processed and an outlet for the object to be processed.
A partition plate is provided in a spiral shape on the inner peripheral surface of the processing cylinder, and a heating element is axially inserted in the central portion of the processing cylinder.

The processing cylinder may be made of ordinary steel, but it is preferable to coat the inner peripheral surface thereof with a heat insulating material in order to improve the thermal efficiency. Also, depending on the processing conditions, particularly the processing temperature,
It is preferable to coat the inner peripheral surface with heat resistant steel or refractory material.
In this case, the outer peripheral surface of the partition plate is also coated with a heat insulating material, heat resistant steel or fire resistant material.

The heating element is axially inserted in the central portion of the processing cylinder. It is conceivable to provide the heating element outside the processing cylinder, but this is too poor in thermal efficiency. As a heating element,
A graphite heater, a molybdenum heater, a radiant tube, or the like can be used, and it is preferable that the heating element is intermediately supported by the inner diameter portion of the partition plate, particularly when the heating element is not supported by both ends thereof.

When the atmosphere in the processing cylinder is maintained under a predetermined gas composition or under a predetermined vacuum according to the purpose of processing, the processing cylinder is surrounded by an airtight container. in this case,
A vacuum pump, a charging system and a discharging system are connected to the airtight container, and the charging system can communicate with the charging port of the processing cylinder, and the discharging system can communicate with the discharging port of the processing cylinder. Provide sealing means to the discharge system. And, preferably, cooling means is provided in the discharge system.

[0009]

When the material to be treated is introduced into the one end of the processing cylinder from the charging port, the material to be treated is repeatedly agitated and rotated by the spiral partition plate rotating together with the processing cylinder, and the treatment is carried out in a stirring state as a whole. It is guided to the other end of the tube, and at the same time, heated by a heating element inserted in the central part of the processing tube. The treatment material thus heated is discharged from the discharge port at the other end of the treatment cylinder. Such heat treatment is also batchwise,
It is also possible to be semi-continuous or continuous, and as described above, the atmosphere can be made to have a predetermined gas composition and a predetermined vacuum by surrounding the processing cylinder with an airtight container.

Therefore, according to the present invention, even if the bulk density of the object to be processed is low and the heat conduction is poor, the relative positional relationship between the heating element and the object to be processed constantly changes, and the object to be processed is treated from various directions. Since the material is heated, the material to be treated can be uniformly heated, and the thermal efficiency can be improved.

[0011]

1 is a vertical sectional view showing an embodiment of the present invention. A cylindrical processing cylinder 11 is placed horizontally, and the processing cylinder 1
An inlet 12 for the object to be treated is provided at the center of the right end of the reference numeral 1, and an outlet 13 for the object to be treated is provided at the left end. A partition plate 21 spirally projects on the inner peripheral surface of the processing cylinder 11, and the heat insulating material 31 covers the inner peripheral surface of the processing cylinder 11 and the outer peripheral surface of the partition plate 21.

The processing cylinder 11 is surrounded by an airtight container 41, and a heating element 51 is inserted from the outside of the airtight container 41 into the inside of the processing cylinder 11. The heating element 51 covers the outer peripheral surface of the partition plate 21. It is intermediately supported by the inner diameter portion of the heat insulating material 31 to be covered. Drive rollers 14 and 15 are interposed between the processing cylinder 11 and the airtight container 41, and the drive rollers 14 and 15 are connected to a drive motor (not shown). Processing cylinder 11
Is supported by the airtight container 41 via the drive rollers 14 and 15, and is rotated by the drive rollers 14 and 15.

A vacuum pump 61 is connected to the airtight container 41, and a charging system 71 capable of communicating with the charging port 12 and a discharging system 72 capable of communicating with the discharging port 13 are respectively connected. The input system 71 and the discharge system 72 have two-stage poppers 81, 8
2 are each equipped, and the upper part 81 of the popper 81
A cylinder-operated sluice valve 91a is provided between a and the lower portion 81b.
A cylinder-driven sluice valve 91b is provided between the lower portion 81b of the popper 81 and the airtight container 41, and the upper portion 8 of the popper 82 is provided.
A cylinder-driven sluice valve 92 is provided between the 2a and the lower portion 82b.
At a, the lower part 82b of the popper 82 and the receiver are sealed by a cylinder driven sluice valve 92b.

The lower portion 81b of the popper 81 and the popper 82
Vacuum pumps 62 and 63 are connected to the lower step portion 82b of the popper 82 and the airtight container 4 respectively.
The cooler 64 is provided in the discharge system portion that connects 1 and 1.

When the material to be processed is loaded from the popper 81 into the processing cylinder 11 via the charging port 12, the material to be processed which is conveyed by the conveyor and loaded into the upper stage portion 81a is opened by opening the gate valve 91a. After the valve 91b is closed, the lower stage portion 81b is charged, and then the vacuum valves are used to make the lower stage portion 81b into a vacuum atmosphere with the partition valves 91a and 92b closed. It is charged into the processing cylinder 11 via the.

The object to be treated is guided to the left end portion of the treatment cylinder 11 in a stirring state as a whole while repeatedly falling and rotating by a spiral partition plate 21 rotating with the treatment cylinder 11.
At the same time, it is heated by the heating element 51. This heating is performed by the vacuum pump 61 inside the airtight container 41, and hence inside the processing cylinder 11, under a vacuum atmosphere.

The treated product thus heat-treated is treated in the treatment cylinder 11
When discharged to the popper 82 from the discharge port 13 through the discharge port 13, the processed product cooled in the cooler 64 and discharged to the upper stage portion 82a is opened in the sluice valve 92a and the sluice valve 92b is closed in the lower stage portion. Discharge to 82b. At the time of this discharge, the vacuum pump 63 preliminarily places the lower part 82b in a vacuum atmosphere. Next, the sluice valve 92a is closed, the sluice valve 92b is opened, and the sheet is discharged to the receiver.

FIG. 1 shows a case in which the inlet of the object to be processed is opened at the center of the right end of the processing cylinder, and the object to be processed is heat-treated in a vacuum atmosphere almost continuously. The invention is not limited to this. For example, when the inlet of the object to be processed is opened at the upper right end or the upper right end of the processing cylinder, and the heating element penetrates the airtight container and is supported at both ends thereof, the rotation of the processing cylinder and the sluice valve. It is also possible to heat-treat the object to be treated batchwise or semicontinuously in a predetermined vacuum atmosphere or a gas composition atmosphere by controlling the opening and closing of.

[0019]

As is apparent from the above, according to the present invention described above, it is possible to uniformly heat an object to be processed having a low bulk density and poor thermal conductivity, and to improve the thermal efficiency. is there.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

[Explanation of symbols]

11 ... Processing cylinder, 12 ... Input port, 13 ... Ejection port, 14, 15 ... Drive roller, 21 ... Partition plate,
31 ... Insulation material, 41 ... Airtight container, 51 ... Heating element, 61, 62, 63 ... Vacuum pump, 64 ...
Cooler, 71 ... Input system, 72 ... Discharge system, 8
1, 82 ... Poppers, 91a, 91b, 92a, 92
b ... Gate valve

Claims (6)

[Claims] 1. A cylindrical processing cylinder provided with an inlet for a material to be processed and an outlet for the material to be processed is rotatably installed, and a partition plate is spirally formed on an inner peripheral surface of the processing cylinder. A heating device which is provided so as to project and in which a heating element is axially inserted in a central portion of the processing cylinder. 2. The heating device according to claim 1, wherein the inner peripheral surface of the processing cylinder and the outer peripheral surface of the partition plate are coated with a heat insulating material, heat resistant steel or fire resistant material. 3. The heating device according to claim 1, wherein the heating element is intermediately supported by the inner diameter portion of the partition plate. 4. The heating device according to claim 2, wherein the heating element is intermediately supported by an inner diameter portion of a heat insulating material, heat resistant steel, or refractory material coated on the outer peripheral surface of the partition plate. 5. The processing cylinder is surrounded by an airtight container, and a vacuum pump is provided in the airtight container, and a discharge system which can communicate with a charging port of the processing cylinder and a discharging port of the processing cylinder. 5. The systems are respectively connected, and the input system and the discharge system are provided with sealing means.
The heating device described. 6. The heating device according to claim 5, wherein the discharge system is provided with a cooling means.