JPH0228387Y2 - - Google Patents

Description

[Detailed description of the invention] The invention of the present application aims to solve the following problems.

(Industrial Field of Application) This invention relates to a dual hot air cupola in which two cupola bodies are operated alternately so that repair of the furnace lining can be carried out in the cupola body which is inactive.

(Prior art) A conventional double-barreled hot air cupola is equipped with two cupola bodies and a heat recovery device, and the gas inlet of the heat recovery device is connected to the two cupola bodies. The heat recovery device preheats the air blown to the cupora main body by burning the unburned gas introduced from the gas inlet. and is configured to be able to adjust the amount of unburned gas to be introduced.Furthermore, partition valves are provided in each of the ducts between the cupora main body and the gas inlet, and these partition valves are selectively closed. This makes it possible to selectively operate the two cupora bodies. When operating these two cupola bodies selectively, reducing the amount of unburned gas introduced in order to adjust the temperature of the blast air preheated in the heat recovery device will cause the pressure inside the duct to become positive. As a result, unburned gas leaked from the gap between the closed compartment valve and the duct's inner wall into the inactive cupola body, posing a danger to workers performing repair work on the inactive cupola body. Conventionally, air is blown upwards from the bottom of the cupola body being repaired using a fan, but this creates problems in that workability is poor due to the dust being blown up, and it is also extremely poor in terms of hygiene. It was hot.

(Problems to be solved by this invention) This invention eliminates the above-mentioned conventional problems, and even when the amount of unburned gas introduced into the heat recovery device is reduced, unburned gas flows into the cupola main body while it is at rest. The purpose of the present invention is to provide a double-barreled hot air cupola that can prevent the above.

The configuration of the present invention is as follows.

(Means for Solving the Problems) The present invention takes the measures as described in the claims above, and its effects are as follows.

(Function) When operating two cupora bodies selectively, the partition valve on the inactive side is closed, the partition valve on the operating side is opened, and unburned gas generated in the cupola body in operation is introduced into the heat recovery device. The combustion of the unburned gas preheats the air that is blown into the operating cupola body. When the amount of unburned gas introduced into the heat recovery device is reduced in order to adjust the temperature of the air blown into the cupola body, the pressure inside the duct becomes positive and the gap between the closed partition valve and the duct inner wall increases. Unburnt gas leaks from. This leaked unburned gas is suctioned and discharged by the suction cylinder.

(Example) Below, drawings showing examples of the present application will be described. 1 is a first cupola body, and 2 is a second cupola body, which constitute two cupola bodies installed on the floor. The first cupola main body 1 and the second cupola main body 2 are normally operated alternately every day, and the furnace lining is repaired when the cupola main body is out of service. In the first and second cupola bodies 1 and 2, 3 and 4 are melting chambers, 5 and 6 are input ports for charging the melting material into the melting chambers 3 and 4 from above, and 7 and 8 are melting chambers 3, 4 is a tuyere for blowing preheated air, and 9 and 10 are cylindrical inlet fittings fixed to the inner surfaces of the first and second cupola bodies 1 and 2.

Next, reference numeral 11 denotes a fixedly installed heat recovery device, which is configured as shown in FIG. In this heat recovery device 11, 12 is a heat exchanger, and a heat exchange tube 14 is disposed within a combustion chamber 13 as is well known. An inlet 13a of the combustion chamber 13 is communicated with an adjustment duct 15, and an outlet (not shown) of the combustion chamber 13 is communicated with an exhaust fan of a dust collector or the like.
Further, one end of the heat exchange tube 14 is connected to the first,
The tuyeres 7 and 8 of the second cupola bodies 1 and 2 are communicated through air conduits 16 and 17, respectively, and the other end is communicated with the atmosphere. Reference numeral 18 denotes a temperature control damper provided in the middle of the adjustment duct 15, which is connected to a controller (not shown) for maintaining the temperature of the air blown to the first and second cupola bodies 1 and 2 at a set value. ing.

Next, 19 is a first duct that communicates the upper part of the melting chamber 3 of the first cupola body 1 with the gas inlet 11a of the heat recovery device 11, and 20 is the first duct that connects the upper part of the melting chamber 4 of the second cupola body 2 with the gas inlet 11a of the heat recovery device 11. These first and second ducts 19 and 20 communicate with each other through a second duct that communicates with the gas inlet 11a. Reference numeral 21 designates a first slide gate valve as a first partition valve provided in the first duct 19, and is slidable by a support wall 22 so as to block the flow of unburned gas within the first duct 19. is supported by 23 is a second slide gate valve as a second partition valve provided in the second duct 20, and is slidable by the support wall 24 so as to block the flow of unburned gas within the second duct 20. is supported by The first and second slide gate valves 19 and 20 are connected to a drive mechanism such as a cylinder. The first and second partition valves may be rotary valves.

Next, 25 is the first slide gate valve 21 and the first
A first suction tube 26 is connected to a first suction port opened on the inner surface of the first duct 19 between the cupora main bodies 1. Reference numeral 27 denotes a second suction port opened on the inner surface of the second duct 20 between the second slide gate valve 23 and the second cupola main body 2, to which a second suction cylinder 28 is connected. The first and second suction cylinders 26 and 28 are raised high upwards, and the length of the raised cylinders is about 10 times the cylinder inner diameter. Further, the upper ends of the first and second suction cylinders 26 and 28 are opened to the atmosphere. 2
9 and 30 are the first and second suction cylinders 26 and 28, respectively.
The first and second switching valves are provided midway between the first and second switching valves.
The flow of unburned gas within the second suction cylinders 26 and 28 can be blocked. 31 is the first and second suction cylinders 2 above the first and second switching valves 20 and 30;
A communication pipe 32 communicates the communication pipes 6 and 28 with each other, and an exhaust pipe 32 communicates with the intermediate portion of the communication pipe 31, and is raised upward. Reference numeral 33 denotes an exhaust fan for forced exhaust installed in the exhaust pipe 32, and is rotationally driven by a drive motor 34.

In the case of the above configuration, when repairing the furnace lining in the second cupola body 2 by operating the first cupola body 1 and stopping the second cupola body 2, the first slide gate valve 2
1 is opened, and the second slide gate valve 23 is closed to allow the melting chamber 3 of the first cupola body 1 and the gas inlet 11a of the heat recovery device 11 to communicate with each other. Further, the first switching valve 29 is closed and the second switching valve 30 is opened to communicate the second suction port 27 with the exhaust pipe 32. Further, the exhaust fan 33 is driven to rotate. As the exhaust fan 33 rotates, air is sucked from the second suction port 27 and the upper end of the second suction tube 28 and discharged from the exhaust pipe 32.
This makes the space inside the second duct 20 between the second slide gate valve 23 and the second cupola main body 2 negative pressure. Operate the cupola main body 1 in the above state,
A melting material is put into the melting chamber 3, and air is blown through the tuyere 7 to melt the melting material. in this case,
Unburnt gas generated in the first cupola main body 1 is introduced into the combustion chamber 13 of the heat recovery device 11 through the first duct 19, and the unburned gas is combusted in the combustion chamber 13 to cause the inside of the heat exchange tube 14 to flow. Heat the air being transferred. As a result, the air blown into the first cupola body 1 is preheated, and this preheated air is blown into the melting chamber 3 of the first cupola body 1. Therefore, thermal energy during melting work can be saved. Furthermore, when introducing the unburned gas generated in the first cupola body 1 to the heat recovery device 11 as described above, the first duct 19 and the second duct 20 are connected, so that the unburned gas generated in the first cupola body 1 is introduced into the heat recovery device 11. When the unburned gas is closed, the second slide gate valve 23 and the second
Sometimes it flows out through the gap between the duct 20 and the inner wall. In particular, in the heat recovery device 11, the heat exchanger 1
When the temperature control damper 18 is closed almost completely in order to adjust the temperature of the air to be preheated in step 2, the pressure of the unburned gas in the first duct 19 becomes positive and 2 slide gate valve 23 and the second
Unburnt gas flows out from the gap with the inner wall of the duct 20,
It attempts to flow into the dissolution chamber 4 of the second cupola main body 2. However, as described above, the second duct 20 between the second slide gate valve 23 and the second cupola main body 2
Since the air inside is constantly sucked and discharged from the second suction port 27, all unburned gas leaking from the second slide gate valve 23 as described above is suctioned from the second suction port 27 and discharged from the exhaust pipe 32. The unburned gas is forcibly discharged and the second cupola main body 2 is at rest.
It is possible to reliably prevent the water from flowing into the second cupola main body 2, and to ensure the safety of workers performing repair work inside the second cupola main body 2.

When suctioning unburned gas from the second suction port 27 as described above, air is also suctioned from the lower part of the second cupola body 2 under repair and is suctioned and discharged from the second suction port 27, so the second slide The temperature of the high-temperature unburned gas leaking from the gate valve 23 is lowered by the suction air, and damage to the exhaust fan 33 due to heat can be prevented. In addition, when the unburned gas is sucked and discharged from the second suction port 27 as described above, the second suction tube 28
Since cold air is also sucked in from the upper end and discharged together with the unburned gas, the high temperature unburned gas sucked in from the second suction port 27 is diluted by the air and the gas temperature is lowered. exhaust fan 3
3 is prevented from burning out, and the durability of the exhaust fan 33 can be improved. Furthermore, when the rotation of the exhaust fan 33 stops due to some kind of failure while operating the first cupola main body 1 as described above, the natural ventilation force within the second suction tube 28 causes the rotation of the exhaust fan 33 to stop. Unburned gas is sucked in from the second suction port 27 and is naturally exhausted, so that even if the exhaust fan 33 stops, the safety of the workers inside the second cupola main body 2 can be maintained.

Next, when the first cupola main body 1 is stopped and the second cupola main body 2 is operated, the first slide gate valve 21 is closed, and the second slide gate valve 2 is closed.
3 is opened, the first switching valve 29 is opened, and the second switching valve 30 is closed, and the second cupola main body 2 is operated in this state. The same applies to the case where the second cupola main body 2 is operated and the first cupola main body 1 is stopped in this way.

(Effect of the invention) As described above, in the present invention, when operating the first cupola main body 1 and the second cupola main body 2,
When either the first compartment valve 21 or the second compartment valve 23 is selectively closed, unburned gas generated in one of the first cupola body 1 and the second cupola body 2 flows out to the other cupola body. This makes it possible to selectively operate one of the first cupola body 1 and the second cupola body 2 while stopping the other, and by repairing the dormant cupola body, the first cupola body 1 can be stopped. There is an advantage that the first and second cupola bodies 2 can be operated alternately and continuously.

In addition, the first cupola body 1 and the second cupola body 2
When operating selectively, the unburned gas generated from the operating cupola body is introduced into the gas inlet 11a of the heat recovery device 11 through the ducts 19 and 20, and the combustion of the unburned gas causes the above-mentioned It is possible to preheat the air blown to the Kyupora body during operation.
Furthermore, by adjusting the amount of unburned gas introduced into the gas inlet 11a, the temperature of the blown air can be adjusted, which has the effect of saving thermal energy.

Furthermore, when the first cupola body 1 and the second cupola body 2 are selectively operated as described above, the air blown to the cupola body can be preheated by unburned gas generated in the cupola body during operation. Even if the heat recovery device 11 is made of 1 Kyupora body 1
Since the first partition valve 21 is provided in the duct 19 between the gas inlets 11a and the second partition valve 23 is provided in the duct 20 between the gas inlet 11a and the second cupola main body 2, the first partition valve 21 and the second partition valve 23 By selectively closing , unburnt gas generated from either the first cupola body 1 or the second cupola body 2 can be introduced into one heat recovery device 11 , and one heat recovery device 1 can be introduced into the heat recovery device 11 .
1 can be used for air preheating of both the first cupola main body 1 and the second cupola main body 2, which has an economical effect of reducing equipment costs. In addition, as mentioned above, the first cupola body 1 and the second cupola body 2
When operating selectively, one heat recovery device 1
The gas inlet 11a of the first cupola body 1 is connected to both the first cupola body 1 and the second cupola body 2, and the heat recovery device 11 is shared for the first cupola body 1 and the second cupola body 2. If the amount of unburned gas introduced into the recovery device 11 is adjusted, even if the unburned gas flows out to the inactive cupola main body through the partition valve on the inactive side, it will still flow through the partition valve to the inactive cupola main body. The leaked unburned gas can be suctioned and discharged by the suction tube, and there are safety effects such as being able to prevent accidents caused by leaked gas flowing in during repair work on the cupola body while it is not in use.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is an explanatory diagram showing a main part of a dual hot air cupola in cross section, and FIG. 2 is a sectional view taken along the line -. 1... First cupola main body, 2... Second cupola main body, 11... Heat recovery device, 11a... Gas inlet, 19... First duct, 20... Second duct,
21...first slide gate valve (first division valve),
23...Second slide gate valve (second partition valve),
26...first suction cylinder, 28...second suction cylinder.

Claims (1)

[Scope of utility model registration request] The above-mentioned method includes two cupola bodies, a first and a second cupola, which are configured to melt the melted material by combustion of gas and blowing air, and further includes one heat recovery device having a gas inlet. The gas inlet of the heat recovery device is connected to the first cupola body and the second cupola body through ducts so as to introduce unburned gas generated in the first cupola body and the second cupola body. The heat recovery device can preheat the air blown to the first cupola body and the second cupola body by burning the unburned gas introduced from the gas inlet, and can preheat the air to be blown to the first cupola body and the second cupola body, and The duct is configured to be able to adjust the amount of gas, and the duct between the first cupola body and the gas inlet port is provided with a first division valve capable of blocking the flow of unburned gas, and a second In the dual hot air cupola, the duct between the cupola main body and the gas inlet port is provided with a second division valve capable of blocking the flow of unburned gas.
A first suction tube is provided between the partition valve and the first suction cylinder capable of constantly suctioning and discharging the air in the duct between the first cupola main body and the first partition valve when the first cupola main body is at rest; A second suction cylinder is provided between the cupola main body and the second partition valve, which can constantly suck and discharge the air in the duct between the second cupola main body and the second partition valve when the second cupola main body is at rest. A double-barreled hot air cupola.