JPS5858407B2 - semi-microscopic grass - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a semi-closed type metal material annealing furnace apparatus equipped with a heat exchanger for heating a heat medium made of substantially inert gas that is forcefully circulated through the metal material annealing furnace.

In particular, the semi-closed type metal material annealing furnace apparatus of the present invention provides heat that heats the metal material at an annealing temperature of 1 by forced circulation of a heat medium consisting essentially of an inert gas (e.g., nitrogen gas, carbon dioxide gas, etc.). It is equipped with an exchanger, and the hot air is discharged from the annealing furnace housing through a hot air discharge air passage, a first heat exchanger, a subsequent electric heater if necessary, and a hot air supply air passage to the annealing furnace housing. A hot air circulation passage for forced circulation of the heat medium is provided, and the hot air supply ventilation passage is connected by a switching valve to a heat generator heated by a first burner, and the hot air supply ventilation passage is connected to a heat generator heated by a first burner. A hot air circulation passage is provided for forcedly circulating hot air from the heat generator through the first heat exchanger and the switching valve to the heat generator again, and the switching valve causes the hot air to pass through the second heat exchanger. The exhaust heat is then used by the second heat exchanger to heat fresh air introduced into the second burner, and the first The present invention is characterized in that the new air taken into the burner can also be heated by the second heat exchanger using exhaust heat from the first heat exchanger.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, the reference numeral 1 generally indicates a metal material annealing furnace.

The metal material annealing furnace 1 includes an annealing furnace housing 10 that can accommodate a metal material (not shown) to be annealed.

Metal materials can be carried into the housing 10 from a truck 8 by a truck 6 running on rails T.

The housing 10 has a structure that can be sealed off from the outside air after carrying in the metal material, except for communication with the hot air supply ventilation path 13 and the hot air discharge ventilation path 12.

The housing 10 includes a hot air outlet 2 and a hot air inlet 3, and the outlet 2 is connected to a hot air outlet duct 12 leading to the first heat exchanger 14.

Furthermore, an electric heater 31 can be provided in the hot air discharge passage 12 as necessary so that the inert gas can be heated when the heating temperature is low. The medium can be heated.

The hot air supply air passage 13 from the first heat exchanger 14 is connected to the hot air inlet 3 via the electric heater 31.

Therefore, a circulation passage is formed from the housing 10 to the housing 10 through the hot air outlet 2, the hot air outlet duct 12, the first heat exchanger 14, the hot air supply air duct 13, and the hot air inlet 3. 11 for forced circulation of hot air consisting essentially of inert gas.

A hot air stirring fan 5 driven by a motor 4 is provided within the housing 10 .

The annealed metal material is taken out from the carriage outlet 9 which can be opened and closed.

Furthermore, a switching valve 32 is provided in the hot air supply ventilation path 13, and the hot air supply ventilation path 13, the switching valve 32, the ventilation path 33, and the first burner 3
A heat generator 34 with a heat generator 34 having a heat generator 5 , a ventilation passage 38 and a circulation ventilation passage for passing hot air from there to the hot air supply ventilation passage 13 .

As a result, when the temperature of the hot air discharged from the first heat exchanger 14 has not reached the desired temperature, the switching valve 32 is operated and the hot air is passed through the heat generator 34 to be heated.

At this time, the new air taken in by the first burner 35 can be taken directly from the outside air, but preferably it is preheated in the second heat exchanger 19 through the air supply passage 29° 39 and the switching valve 30. Get some fresh air.

The air becomes an inert gas (nitrogen gas, carbon dioxide gas, etc.) through a combustion process in the burner 35, and the inert gas is supplied here, and this state is called a semi-closed type.

Of course, in response to the new supply of hot air, it is preferable to provide a damper (not shown) in the hot air discharge passage 12 to release the heat-radiated inert gas.

The hot air that supplies heat to the first heat exchanger 14 is supplied to the heat generator 18
The hot air is heated by the second burner 17, and the hot air is heated by the second burner 17.
6 and into the first heat exchanger 14.

After the hot air has sufficiently released heat, it is sucked out by the suction fan 16 from the first heat exchanger 14 through the hot air discharge passage 27, and then passes through the switching valve 20 and the recirculation passage 24 and returns to the heat generator 18. and forced circulation.

When the switching valve 20 is switched, the hot air enters the second heat exchanger 19 through the hot air exhaust air passage 28, and is then exhausted to the outside air from the exhaust port 22.

The second heat exchanger 19 is adapted to preheat the fresh air introduced into the burners 17 and 35.

In the figure, reference numeral 25°37 is a heavy oil supply port, but any other suitable fuel can be used.

Further, since the housing 10 does not directly use a burner, it does not need to be made of firebrick, and only a heat insulating material is sufficient, and since it is lightweight, it can be formed to be movable and assembleable.

With the above configuration, the new air required for combustion in the burner is preheated by exhaust heat without discharging heated gas as in the conventional case, so the thermal efficiency is several times higher than that of conventional annealing furnaces. improved and requires much less fuel.

Furthermore, when the temperature of the inert gas hot air passing through the annealing furnace housing is low, it can be directly heated by the burner, so that the metal material can be reliably heated according to the annealing temperature curve.

In addition, waste heat is sufficiently absorbed by the new air in the second heat exchanger, and the temperature of the exhaust gas released into the outside air can be lowered, resulting in less fuel consumption and the use of equipment to prevent pollution. will also become unnecessary.

This metal material annealing furnace equipment is a semi-closed type that uses a heat medium consisting essentially of an inert gas, so it not only has high thermal efficiency, but also allows the metal material to be annealed to be annealed using equipment such as Matsufuru. Since the material is not oxidized, a favorable annealing effect can be obtained, and the material can be heated ideally according to the annealing curve, so the quality is significantly improved.

In addition, the unique combination of the semi-closed type hot air ventilation path and the heat exchanger makes it possible to improve the thermal efficiency by 3 to 5 times or more compared to the past.

Furthermore, since this device can be assembled, it can be made at low cost and can be installed in any location to perform annealing.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a metal material annealing furnace according to the present invention;
FIG. 2 is a schematic diagram showing a heat exchanger arrangement device applied to a metal material annealing furnace according to the present invention. 10... Annealing furnace housing, 12...
Hot air discharge ventilation duct, 13...Hot air supply ventilation duct, 1
7... Second burner, 18, 34... Heat generator, 14... First heat exchanger, 19...
...Second heat exchanger, 20.32...Switching valve, 31...Electric heater, 35...First burner.

Claims (1)

[Scope of Claims] 1. In a metal material annealing furnace apparatus equipped with a heat exchanger that heats a metal material at an annealing temperature of 1 by forcedly circulating a heat medium substantially consisting of an inert gas, A hot air circulation passageway for forcibly circulating the heat medium to the annealing furnace through the hot air exhaust ventilation passage, a first heat exchanger, an electric heater following it, and a hot air supply ventilation passage,
Furthermore, the semi-closed type metal material annealing furnace apparatus is characterized in that the hot air supply ventilation passage communicates with a heat generator heated by the first burner through a switching valve. 2. A hot air circulation passage is provided for forcibly circulating the hot air heated by the second burner from the heat generator through the first heat exchanger and the switching valve to the heat generator again, and the hot air is further circulated by the switching valve. is discharged to the outside air through a second heat exchanger, and the waste heat can be used by the second heat exchanger to heat fresh air introduced into the second burner. A semi-microclosed metal material annealing furnace apparatus according to claim 1. 3. According to claim 2, the new air taken into the first burner is configured to be heated by the second heat exchanger using exhaust heat from the first heat exchanger. Semi-closed type metal material annealing furnace equipment.