JPS6041507Y2 - material heating device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a material heating device suitable for heating materials supplied to a melting furnace or the like, especially materials containing odor-producing substances such as fats and oils.

Conventionally, preheating was performed in a single stage by simply passing the material through the exhaust gas path, which resulted in poor thermal efficiency and the exhaust gas temperature after heating the material was high. Since the exhaust gas temperature is cooled with cold air, the fin capacity increases and the exhaust gas treatment cost increases.

Furthermore, if the temperature of the gas for heating the material is 600° C. or lower, a large amount of odor will be generated from the fats and oils adhering to the material, which will require an expensive deodorizing device.

In view of the above points, the present invention aims to provide an inexpensive and compact material heating device that does not require a deodorizing device for heating materials containing odor-producing substances.

In order to achieve the above-mentioned object, the present invention includes at least two heating chambers each having an openable bottom lid and an air hole in the lower circumferential wall, which are arranged one above the other, and a material input hole which can be opened and closed at the top of the upper heating chamber. , a hot air generating furnace that supplies hot air to the lower heating chamber, and pressurized air that is supplied to the air holes of the upper heating chamber using exhaust gas from the lower heating chamber, in a lower heating chamber with a material discharge port that can be opened and closed. It is equipped with a heat exchanger for heating and a duct for guiding exhaust air from the top of the upper heating chamber to the hot air generating furnace.

Embodiments of the present invention will be described below with reference to the drawings.

In Fig. 1, 1 is a lower heating chamber in which a hot air generating furnace 2 is installed obliquely downward in the middle of the front part, 3 is an upper heating chamber placed directly above the lower heating chamber 1, and its bottom lid 4 is the lower heating chamber. It also serves as a partition wall from 1.

The lower heating chamber 1 has a bottom lid 6 that can be opened and closed by a pair of left and right cylinders 5 (only one is shown in the figure), and a number of air holes 7 are provided on the lower peripheral wall, and these air holes 7 connect the heating chamber and the lower tier. It communicates with a lower chamber 8 directly below the heating chamber, and a material discharge chute 11 provided with a partition plate 10 that is opened and closed by a cylinder 9 is connected to the lower surface of the lower chamber 8 .

The upper heating chamber 3 is supported and connected to a support frame 13 that surrounds the outer circumferential surface of the heating chamber above it by upward cylinders 12 mounted at appropriate intervals in the circumferential direction in the middle of the outer surface of the upper heating chamber 3. and a plurality of openable and closable bottom cover parts 14 constituting the bottom cover 4 are connected by links 15, and the plurality of bottom cover parts 14 are opened and closed simultaneously by the operation of the cylinder 12.

A large number of air holes 16 are provided in the lower peripheral wall of the upper heating chamber 3 to connect the heating chamber with an air box 17 that surrounds the lower outer peripheral wall.A partition plate 19 that is opened and closed by a cylinder 18 is provided at the top of the upper heating chamber 3. A material input hopper 20 and a plurality of through holes 21 are provided around it, and the through holes 21 are connected to the hot air generation furnace 2 via a duct 22, and the pressurized air that has passed through the upper heating chamber 3 is used to generate hot air. It is configured to be used as combustion air for the furnace 2.

The heat exchanger 23 heats the pressurized air sent from the blower 24 through the duct 25 with the high-temperature exhaust gas discharged from the lower heating chamber 1 to the lower chamber 8. After the pressurized air is heated, it is released from the duct 26 to the outside, while the heated pressurized air is guided from the duct 27 through the wind box 17 and the air hole 16 into the upper heating chamber 3. .

In the system shown in FIG. 2, the upper heating chamber 3 is arranged slightly backward from directly above the lower heating chamber 1, so that the material falling from the upper heating chamber 3 is guided to the lower heating chamber 1 by the inclined wall 28. In addition, the downward angle of the hot air generating furnace 2 is made large, and the heat exchanger 23 is disposed using the space below the inclined wall 28.

Further, the bottom cover 6 of the lower heating chamber 1 and its opening/closing mechanism have the same structure as that of the upper heating chamber 3.

In the one shown in FIG. 3, a hot air generating furnace 2 is disposed in the front part of the lower chamber 8, and a heat exchanger 23 is disposed above it, and the high temperature gas flow in the lower heating chamber 1 is Contrary to the case shown in the figure, the flow becomes an upward flow and enters the heat exchanger 23.

The embodiment shown in FIGS. 2 and 3 differs from the embodiment shown in FIG. 1 in the above-mentioned configuration, but is functionally the same as the embodiment shown in FIG. 1.

Next, the operation of this embodiment will be explained with reference to FIG.

To heat the materials in the heating chambers 1 and 3, first, the material input hopper 20 and the material discharge chute 11 are closed with the partition plate 19.10, and the blower 24 and the induction fan (not shown) of the duct 26 are driven. After ventilating the inside of the furnace, the hot air generating furnace 2 is operated.

The high-temperature gas from the hot air generating furnace 2 heats the material in the process of descending through the 29 layers of material in the lower heating chamber 1 by the induced fan in the duct 26, and then flows into the lower chamber 8 through the gap between the air vent 7 and the bottom cover 6.
The pressurized air enters the heat exchanger 23 via the air blower 24 and is preheated by the blower 24, and then escapes to the outside through the duct 26.

On the other hand, the pressurized air preheated by the heat exchanger 23 is transferred to the duct 27
, when the material 29 is heated in the process of entering the upper heating chamber 3 through the air hole 16 through the air box 17 and rising inside the chamber, the material 29 is heated through the air hole 21.
The air then flows through the duct 22 to the hot air generating furnace 2, where it is consumed as combustion air in the hot air generating furnace.

When the material is heated for a predetermined time, the hot air generating furnace 2 and the blower 24
, the drive of the induction fan, etc. is stopped, and the bottom lid 6 of the lower heating chamber 1 and the partition plate 10 of the material discharge chute 11 are opened by the cylinders 5 and 9, and the material 29 in the lower heating chamber 1 is passed from the bottom lid 6 through the material chute 11. The material is discharged to the outside, and the discharged material is supplied to a material supply point, for example a melting furnace, by a suitable conveying device.

When the material in the lower heating chamber 1 is discharged, the bottom lid 6 and the partition plate 10 are closed, and the material 29 in the upper heating chamber 3 is supplied to the lower heating chamber 1 by opening the bottom lid 4 by the cylinder 12, and then the bottom lid 4 is closed. Then, the cylinder 18 opens the partition plate 19 and supplies the material from the material input hopper 20 to the upper heating chamber 3.

When the material supply is finished, the partition plate 19 is closed, the blower 24 and the induction fan are driven, and the hot air generating furnace 2 is started to perform the above-mentioned material heating operation.
0 is supplied with materials at an appropriate time.

The following continuous operation is performed by alternately repeating the heating work of the material and the work of discharging, transporting, and supplying the material.

That is, the material is first heated by relatively low-temperature pressurized air in the upper heating chamber 3, but the temperature difference between the material and the material at room temperature is sufficiently large, so it is efficiently heated, and the material whose temperature has risen to a considerable degree is thereby heated. Since the material is reheated in the lower heating chamber 1 with a sufficient temperature difference using high-temperature gas, the heating temperature of the material is raised stepwise and rapidly.

Moreover, since the material falls and moves by the opening operation of the bottom cover and the partition plate, the present apparatus does not require a material transfer device.

Therefore, when heating the material, in this embodiment, the heat exchanger 23
The temperature of the exhaust gas entering the chamber is approximately 600°C, and the temperature of the pressurized air sent into the upper heating chamber 3 is approximately 550°C.

For this reason, if the material in the upper heating chamber 3 has odor-producing substances such as oils and fats attached to it, a large amount of odor will be generated by heating with pressurized air, but the pressurized air containing this odor will be removed from the duct. 2
Since the odor is sent to the hot air generating furnace 2 via the hot air generating furnace 2, the odor is thermally decomposed and disappears at the furnace temperature (1000 to 1300° C.) of the hot air generating furnace 2.

In addition, if odor-producing substances remain in the material in the lower heating chamber 1, odor will be generated by the high temperature gas that heats the material, but this high temperature gas will only reach a temperature of around 600°C after heating the material. Because of this, the odor disappears through thermal decomposition.

Therefore, the odor caused by the odor-producing substance is treated within the device and is not carried out to the outside.

As explained above, in the present invention, the material is heated in stages by the high-temperature gas generated in the hot air generating furnace and the pressurized air preheated by the exhaust gas, so the material can be heated efficiently and The pressurized air is consumed as combustion air in the hot air generator after heating the material, so it is useful for utilizing thermal energy.

In addition, it is possible to heat a material containing an odor-producing substance without a deodorizing device, and since a material transfer device is not required, an inexpensive and compact material heating device can be provided.

[Brief explanation of the drawing]

1, 2, and 3 are longitudinal sectional views showing embodiments of the present invention, respectively. 1...Lower heating chamber, 2...Hot air generating furnace, 3. Bent/upper heating chamber, 4, 6...Bottom cover, 5.
9, 12, 18... cylinder? , 16...
...Air hole, 10,19...Partition plate, 11...
... Material discharge chute, 14 ... Bottom cover part, 15 ... Link, 20 ... Material input hopper, 23 ... Heat exchanger, 24...
Blower, 29... Material.

Claims (1)

[Scope of utility model registration request] At least two heating chambers each having an openable bottom lid and an air hole in the lower circumferential wall are arranged one above the other, a material input hopper that can be opened and closed is placed on the top of the upper heating chamber, and a material discharge port that can be opened and closed is located at the bottom of the lower heating chamber. A hot air generating furnace that supplies hot air to the lower heating chamber, a heat exchanger that uses exhaust gas from the lower heating chamber to heat pressurized air that is supplied to the air holes in the upper heating chamber, and a A material heating device characterized in that it is provided with a duct that guides the discharged air to the hot air generating furnace.