JPS629939Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention mainly relates to a preheating device for raw materials to which odor-producing substances such as fats and oils are attached.

Conventionally, one-stage preheating was performed, in which the raw material was passed through a hot air stove, an exhaust gas path, etc. once. With this, the exhaust gas temperature is high and the thermal efficiency is poor, so if we use two-stage preheating, the thermal efficiency will improve, but if the temperature of the exhaust gas after preheating is below 600℃, odor-producing gases such as oil and fat will adhere to the raw material. Since large amounts of odor are generated, expensive deodorizing equipment is required.

This invention was made in view of the above points,
a high-temperature gas generating furnace; a high-temperature gas duct that guides the combustion gas of the high-temperature gas generating furnace from a preheating bucket to the outside via a heat exchanger; and a high-temperature gas duct that guides the combustion gas of the high-temperature gas generator to the outside via a heat exchanger, and preheats the pressurized air preheated by the heat exchanger before the preheating bucket. A preheating air duct is provided which leads pressurized air for combustion to the high-temperature gas generating furnace via a preheating bucket positioned at a certain position, and a conveyance line is provided which intermittently feeds the preheating bucket just by the pitch of the preheating bucket. When preheating the raw materials in the preheating bucket with pressurized air, the odor generated from odor-producing substances such as oils and fats attached to the raw materials is thermally decomposed at the furnace temperature (1000 to 1300℃) of the high-temperature gas generating furnace. Odor-producing substances such as fats and oils adhering to the raw materials to be reheated are burned and disappeared by the combustion gas of the high-temperature gas generating furnace, and the odor is not discharged outside. It is possible to preheat raw materials with adhering substances in two stages without using a deodorizing device.

An embodiment of the present invention will be described below with reference to the drawings. 1 is a roller conveyor device, in which a considerable number of preheating buckets 3 are placed on a roller conveyor 2 in the feeding direction.
These preheating buckets are arranged in a row at a predetermined interval L, and are intermittently fed in the direction of the arrow by a predetermined interval L (the pitch of the preheating buckets) every time a predetermined time elapses. The preheating bucket 3 has a bucket 18 in which a number of through holes 17 are formed in the lower circumferential surface and the bottom of the vertical through hole 16, and the raw material 20 is placed inside the bucket 18.
to store.

On the roller conveyor 2 there are a first preheating position 4 and a second preheating position 4.
A preheating position 5 is set at a predetermined interval L (same as the pitch L of the preheating bucket), and the vertical part of the high temperature gas duct 6 is arranged at the second preheating position 5, so that the preheating bucket 3a located here is vertically penetrated. A vertical portion of the preheating air duct 7 is disposed at the first preheating position 4 and communicated with the vertical through hole 16 of the preheating bucket 3b located there.

The high temperature gas duct 6 mainly includes a duct 10 that communicates via the preheating bucket 3a with a high temperature gas generating furnace 9 attached to a fixed member 8 directly above the preheating bucket 3a, a heat exchanger 11 connected to the duct 10,
It consists of a duct 12 communicating with the duct 10 via a heat exchanger 11 and an induced draft fan (not shown) disposed in the duct 12. The preheating air duct 7 mainly includes a duct 13 equipped with a forced air blower (not shown), and a heat exchanger 1 connected to the duct 13.
1 (shared with the high-temperature gas duct 6), a duct 14 that communicates with the duct 13 via the heat exchanger 11 and whose upper end is located on the lower surface of the preheating bucket 3b, one end connected to the high-temperature gas generating furnace 9 and the other end for preheating. It consists of a duct 15 located on the upper surface of the bucket bag 3b. In addition, suitable known gas leakage prevention means are provided at the connection points of the high-temperature gas generating furnace 9 and the high-temperature gas duct 6 to the preheating bucket 3a, and the connection points of the preheating bucket 3b and the preheating air duct 7, if necessary. For example, an extensible cylindrical body part is attached to the end of the duct, one end of a cylinder attached to a fixed member is connected to this, and the free end surface of the cylindrical body is pressed by this cylinder against the end face of the preheating bucket via a packing. You can also do this.

Next, the operation of the present invention will be explained. A plurality of preheating buckets 3 arranged on a roller conveyor 2
After a predetermined time has elapsed, the roller conveyor device 1 sends a predetermined distance L in the direction of the arrow. As a result, the preheating bucket that was at the second preheating position 5 is positioned at the delivery position 2, the preheating bucket that was at the first preheating position 4 is positioned at the second preheating position 5, and a new preheating bucket is positioned at the first preheating position 4. The preheating bucket is positioned. Here, if the connection points of the high temperature gas generating furnace 9 and the preheating bucket 3a of the high temperature gas duct 6 and the connecting points of the preheating air duct 7 and the preheating bucket 3b are connected by gas leak prevention means, the high temperature gas generating furnace 9 is preheated. Air duct 7
Pressurized air for combustion is sent from the burner 19 to burn the fuel, and the combustion gas is discharged to the outside through the preheating bucket 3a through the heat exchanger 11 and the duct 12 by the attraction of an induced exhaust fan (not shown). be done. At this time, the raw material 20 in the preheating bucket 3a is preheated with combustion gas, and if odor-producing substances such as fats and oils are attached to the raw material 20, this odor-producing substance is combusted by the combustion gas. Odor disappears. Therefore, odor is not discharged to the outside. On the other hand, the pressurized combustion air that has been preheated from the duct 13 through the heat exchanger 11 is transferred to the duct 14, the preheating bucket 3b, and the duct 15.
It reaches the high temperature gas generating furnace 9 through the heat exchanger 11.
The temperature when exiting from the duct 10 to the heat exchanger 1
Since the temperature of the combustion gas flowing into 1 is generally around 600°C, the temperature is around 550°C. For this reason, when preheating the raw material in the preheating bucket 3b, it is not possible to thermally decompose the odor generated from the odor-producing substance of oil and fat attached to the raw material. However, this odor-laden pressurized air is used as combustion air in the high-temperature gas generator 9.
Since the odor is sent to the furnace temperature (1000 ~
It is completely thermally decomposed and disappears at 1300℃). Therefore, the odor of odor-producing substances such as fats and oils adhering to the raw materials disappears within the apparatus and is not discharged outside the apparatus.

When the raw material preheating work is carried out for a predetermined period of time, each raw material in the preheating buckets 3a and 3b reaches a predetermined preheating temperature, and at least most of the odor-producing substances such as oils and fats attached to the raw materials in the preheating buckets 3b are removed. The odor-producing materials such as oil and fat that were vaporized and adhered to the raw materials of the preheating bucket 3a are burnt out. When the raw material preheating work is completed, the burner 19 is extinguished and the connection between the preheating bucket and the duct is released. Next, the preheating bucket 3a is sent from the second preheating position 5 to the delivery position 2, and the preheating bucket 3a from the second preheating position 5 is moved to the second preheating position 5 by the roller conveyor device 1.
the preheating bucket 3b at the first preheating position 4,
Position new preheating buckets at the preheating position 4, connect the upper and lower parts of the preheating buckets 3a and 3b to the duct and the high-temperature gas generating furnace, and then turn the burner 1 on again.
9 and repeat the above operation. Thus,
Preheating of the raw material and intermittent feeding of the preheating bucket by the roller conveyor device are repeated alternately, whereby the raw material in the preheating bucket is first preheated at the first preheating position and then preheated at the second preheating position. . The preheating bucket delivered to the delivery position 21 is transported to a preheated raw material supply point, for example, a melting furnace (not shown), by an appropriate conveyance device such as a crane, conveyor, or trolley.

As is clear from the above explanation, in the present invention, the raw material is divided into two parts using the combustion gas flow from the high-temperature gas generating furnace and the pressurized combustion air preheated by this combustion gas flow.
At the same time as stage preheating, the odor generated by preheating the raw material with pressurized air for combustion is thermally decomposed and disappears at the furnace temperature of the high-temperature gas generating furnace, and the odor-producing substances attached to the reheated raw material are combusted. Odors are eliminated by combustion with gas, so no odors are emitted to the outside of the device. Therefore, it is possible to preheat the raw material to which odor-producing substances are attached in two stages without using a deodorizing device. Moreover, the combustion gas generated in the high-temperature gas generating furnace is used to preheat the raw material and then the pressurized air, and the pressurized air is used as the combustion air for the high-temperature gas generating furnace after preheating the raw material.
Helps improve thermal efficiency.

[Brief explanation of the drawing]

The drawing is a partially cutaway side view showing an embodiment of the present invention. 1... Roller conveyor, 3, 3a, 3b... Preheating bucket, 4... First preheating position, 5... Second
Preheating position, 6...High temperature gas duct, 7...Preheating air duct, 9...High temperature gas generating furnace, 10,1
2, 13, 14, 15...Duct, 11...Heat exchanger, 17...Through hole, 18...Bucket, 19...
...burner, 20...raw material, 21...feeding position.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A high-temperature gas generating furnace, a high-temperature gas duct that guides the combustion gas of the high-temperature gas generating furnace from a preheating bucket to the outside via a heat exchanger, and a heated gas duct that is preheated by the heat exchanger. a preheating air duct that leads pressurized air to the high temperature gas generating furnace as pressurized air for combustion through a preheating bucket positioned at a preheating position in front of the preheating bucket; A multi-bucket type raw material preheating device consisting of a conveyor line. (2) Multiple bucket type raw material preheating according to claim 1, which is a utility model registration claim, in which an induced draft fan is arranged downstream of the heat exchanger in the high-temperature gas duct, and a forced draft fan is arranged upstream of the heat exchanger in the preheating air duct. Device.