JP7032014B1 - Industrial furnace and fuel supply / stop detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and surely detect that fuel supply to all burners is stopped through all fuel supply pipes at the time of maintenance of an industrial furnace or the like. SOLUTION: Each fuel supply pipe 30 for supplying fuel to each burner in an industrial furnace is provided with an opening / closing valve 31 which is opened / closed by a manual opening / closing lever 31a, while the confirmation gas guide pipe 50 for passing the confirmation gas X is provided. , A detection valve 50 that is opened and closed by operating the switch member 51a by the manual open / close lever is provided in series, and the detection valve is closed when the open / close valve is opened by the manual open / close lever to supply fuel to the burner. When the confirmation gas does not flow and the on-off valve is closed to stop the fuel supply to the burner, the detection valve is opened so that the confirmation gas flows through the detection valve and is confirmed by the detection device 52. Detects the confirmation gas flowing through the gas guide tube. [Selection diagram] Fig. 1

Description

The present invention relates to an industrial furnace provided with a plurality of burners for mixing and burning fuel and combustion air, and a fuel supply / stop detection device. In particular, when stopping the combustion of all burners in an industrial furnace during maintenance of an industrial furnace, it is easy and sure that the supply of fuel to all burners through all fuel supply pipes is stopped. It is characterized by being able to detect it.

Conventionally, as an industrial furnace, as shown in Patent Document 1 and the like, those provided with a plurality of burners that mix and burn fuel and combustion air are known.

Here, in an industrial furnace provided with a plurality of burners that mix and burn fuel and combustion air as described above, in general, an electromagnetic valve is provided in each fuel supply pipe that supplies fuel to each burner. The electromagnetic valve is electrically controlled to supply and stop fuel to each burner through each fuel supply pipe, and to control combustion in each burner.

Then, in such an industrial furnace, when the combustion in all the burners is stopped at the time of maintenance or the like, each solenoid valve provided in all the fuel supply pipes is used to all the burners through all the fuel supply pipes. I try not to supply fuel.

However, if a solenoid valve is provided in each fuel supply pipe in this way, and wiring for electrically controlling the solenoid valve and a control device for controlling the solenoid valve are provided, the installation cost becomes high and in the event of a power failure or in the event of a power failure. There is a problem that the solenoid valve may not operate due to poor connection of electrical equipment, and it is difficult to reliably detect whether fuel supply to all burners has been stopped through all fuel supply pipes. rice field.

Further, conventionally, as shown in Patent Document 2, when a gas valve with a limit switch is provided in the gas pipe and the bubble handle in the gas valve is operated to stop the gas supply by the gas pipe, the bubble handle is the limit. It has been proposed that the limit switch is energized away from the switch button and the indicator light of the centralized open / close confirmation board is turned on.

However, in an industrial furnace provided with a plurality of burners as described above, when all fuel supply pipes are provided with gas valves with limit switches as described above, it is necessary to provide a large number of gas valves with limit switches and wiring. And the installation of a control device is required, and the equipment cost is very high. Also, as in the case of the above-mentioned solenoid valve, there is a risk that the limit switch will not operate due to a power failure or poor connection of electrical equipment. There is a problem that it becomes difficult to reliably detect whether the supply of fuel to all burners has been stopped through all the fuel supply pipes.

Japanese Unexamined Patent Publication No. 2014-48020 Gazette No. 57-1979

An object of the present invention is to solve the above-mentioned problems in an industrial furnace provided with a plurality of burners that mix and burn fuel and combustion air.

That is, in the above-mentioned industrial furnace, when the combustion in all the burners is stopped at the time of maintenance of the industrial furnace, the present invention stops supplying fuel to all the burners through all the fuel supply pipes. It is an object of the present invention to enable easy and reliable detection of such a thing, and to provide a fuel supply / stop detection device used for such detection.

In the industrial furnace of the present invention, in order to solve the above-mentioned problems, in an industrial furnace provided with a plurality of burners for mixing and burning fuel and combustion air, each fuel supply for supplying fuel to each burner is provided. An on-off valve provided with a manual opening / closing lever is provided on the pipe, while a confirmation gas guide pipe for passing a confirmation gas is provided on the pipe. When a detection valve that opens and closes by operating the switch member by the operation of the manual open / close lever is provided in series corresponding to the open / close valve, and the open / close valve is opened by the manual open / close lever to supply fuel to the burner. The manual opening / closing lever operates the switch member to close the detection valve to prevent the confirmation gas from flowing, while the manual opening / closing lever closes the opening / closing valve to the burner. When the fuel supply of the above is stopped, the switch member is operated by the manual opening / closing lever, and the detection valve is opened so that the confirmation gas flows through the detection valve, and all of the above. The opening / closing valve of the above-mentioned opening / closing valve is closed, all the above-mentioned detection valves are opened, and a detection device for detecting the confirmation gas flowing through the above-mentioned confirmation gas guide tube is provided.

Then, as in the industrial furnace of the present invention, when the open / close valve is opened by the manual open / close lever to supply fuel to the burner, the switch member is operated by the manual open / close lever, and the detection valve is closed. While preventing the confirmation gas from flowing, when closing the open / close valve with the manual open / close lever to stop the supply of fuel to the burner, the manual open / close lever operates the switch member to operate the detection valve. When opened to allow confirmation gas to flow through the detection valve, and when all open / close valves are closed and all detection valves are opened, the confirmation gas flowing through the confirmation gas guide tube is detected by the detection device. Therefore, in order to stop combustion in all burners during maintenance of industrial furnaces, it is not necessary to install electrical equipment such as electromagnetic valves and gas valves with limit switches in all fuel supply pipes as in the past. However, it becomes possible to mechanically and surely detect whether the supply of gas from all the fuel supply pipes to all the burners is stopped by the above-mentioned detection device.

Here, in the industrial furnace of the present invention, as the detection device, a pressure gauge for detecting the flow of the confirmation gas through the confirmation gas guide pipe can be provided. In this way, it is not necessary to provide electrical equipment to the detection device.

Further, in the fuel supply / stop detection device of the present invention, in the fuel supply / stop detection device that detects the supply / stop of fuel by the fuel supply pipe, the fuel supply pipe is provided with a manual opening / closing lever. While providing a valve, a detection valve that opens and closes by operating the switch member by the operation of the manual opening / closing lever in the opening / closing valve provided in the fuel supply pipe is connected in series to the confirmation gas guide pipe through which the confirmation gas passes. When the open / close valve is opened by the manual open / close lever and fuel is supplied by the fuel supply pipe, the switch member is operated by the manual open / close lever, and the detection valve is closed for confirmation. While preventing gas from flowing, when the opening / closing valve is closed by the manual opening / closing lever to stop the supply of fuel to the burner, the switch member is operated by the manual opening / closing lever for the detection. The valve was opened so that the confirmation gas flowed through the detection valve, and a detection device was provided to detect the confirmation gas flowing through the confirmation gas guide tube.

In the fuel supply / stop detection device of the present invention, when the open / close valve is opened by the manual open / close lever and fuel is supplied by the fuel supply pipe, the switch member is operated by the manual open / close lever for detection. The manual opening / closing lever operates the switch member when the valve is closed to prevent the confirmation gas from flowing, while the manual opening / closing lever closes the opening / closing valve to stop the supply of fuel to the burner. , The detection valve opens so that the confirmation gas flows through the detection valve, and the confirmation gas flowing through the confirmation gas guide pipe is detected by the detection device, so fuel is supplied to the burner through the fuel supply pipe. With the above-mentioned detection device, it becomes possible to mechanically and surely detect whether or not the gas is stopped.

In the industrial furnace according to the present invention, when the open / close valve is opened by the manual open / close lever provided in the fuel supply pipe to supply fuel to the burner, the switch member is operated by the manual open / close lever to operate the gas for confirmation. The detection valve provided on the guide tube is closed to prevent the confirmation gas from flowing, while the manual opening / closing lever closes the opening / closing valve to stop the supply of fuel to the burner. The switch member is operated by the lever to open the detection valve so that the confirmation gas flows through the detection valve, and the detection device detects and detects whether the confirmation gas is flowing through the confirmation gas guide tube. By detecting that all detection valves are opened by the device and the confirmation gas is flowing through the confirmation gas guide pipe, all open / close valves are closed and fuel is supplied from all fuel supply pipes to all burners. Can be easily and reliably detected that the gas is not supplied.

As a result, in the industrial furnace according to the invention, in order to confirm whether the supply of fuel to all the burners through all the fuel supply pipes is stopped at the time of maintenance of the industrial furnace, all of them are as in the conventional case. It is not necessary to provide electrical equipment such as a solenoid valve or a gas valve with a limit switch on the fuel supply pipe, and the above-mentioned mechanical detection device enables easy and reliable detection.

In the industrial furnace according to the embodiment of the present invention, in (A), each on-off valve provided in each fuel supply pipe is opened by a manual on-off lever, and each burner is supplied with gas through each fuel supply pipe. While the fuel and combustion air are mixed and burned in the burner, the manual opening / closing lever is separated from the switch member, so that the detection valve provided in the confirmation gas guide tube is closed and the confirmation gas is confirmed. A schematic explanatory view showing a state in which the flow of the confirmation gas is not detected by the detection device without flowing in the gas guide pipe, (B) closes each open / close valve provided in each fuel supply pipe by a manual open / close lever. By preventing fuel from being supplied to each burner through each fuel supply pipe and stopping combustion in each burner, while the manual opening / closing lever comes into contact with the switch member, all provided in the confirmation gas guide pipe. It is a schematic explanatory drawing which showed the state which the detection valve of is opened, the confirmation gas flows in the confirmation gas guide tube, is detected by the detection device, and it is detected that all burners are extinguished. In the industrial furnace according to the above-described embodiment, when fuel is supplied to some burners and burned with a part of each on-off valve provided in each fuel supply pipe open. When the manual opening / closing lever of is separated from the switch member, a part of the detection valve provided in the confirmation gas guide tube is closed, and the confirmation gas does not flow in the confirmation gas guide tube. It is a schematic explanatory diagram which showed the state which it is detected that the flow of a gas is not detected by a detection device, and the burner which is burning remains.

Hereinafter, the industrial furnace according to the embodiment of the present invention and the fuel supply / stop detection device used in the industrial furnace will be specifically described with reference to the accompanying drawings. The industrial furnace and the fuel supply / stop detection device according to the present invention are not limited to those shown in the following embodiments, and can be appropriately modified and implemented without changing the gist of the invention.

In the industrial furnace of this embodiment, as shown in FIGS. 1A and 1B, a plurality of burners 20 are provided on the furnace wall 11 of the furnace 10 at appropriate intervals.

Then, the fuel supply pipe 30 for supplying the fuel G and the air supply pipe 40 for supplying the air air for combustion are connected to each burner 20, and the fuel G supplied through the fuel supply pipe 30 in each burner 20 is connected. And the air Air supplied through the air supply pipe 40 are mixed and burned.

Further, in the industrial furnace of this embodiment, an opening / closing valve 31 having a manual opening / closing lever 31a is provided in each of the fuel supply pipes 30 for supplying the fuel G to the burner 20, and the manual opening / closing lever 31a is operated to open / close. The valve 31 is opened and closed, and the fuel supply pipe 30 switches between supplying and stopping the fuel G to the burner 20.

Then, in this embodiment, as shown in FIG. 1 (A), in the state where the manual opening / closing lever 31a is rotated downward from the horizontal state in the figure and tilted downward, the above-mentioned The on-off valve 31 opens, fuel G is supplied to the burner 20 through the fuel supply pipe 30, mixed with air Air supplied through the air supply pipe 40, and burned, while as shown in FIG. 1 (B). In a state where the manual opening / closing lever 31a is rotated upward from a state of being tilted downward to be horizontal, the opening / closing valve 31 is closed so that the fuel G is not supplied to the burner 20 and combustion is stopped. Become.

Further, in the industrial furnace of this embodiment, a confirmation gas guide pipe 50 through which the confirmation gas X is passed is provided in a direction intersecting each of the fuel supply pipes 30, and each fuel is supplied to the confirmation gas guide pipe 50. Each detection valve 51 is provided so as to correspond to each on-off valve 31 provided in the pipe 30, and each detection valve 51 is provided with a switch member 51a operated by a manual on-off lever 31a in the on-off valve 31. In addition to being provided, pressure is provided as a detection device 52 for detecting the confirmation gas X guided through the confirmation gas guide pipe 50 at the position of the confirmation gas guide pipe 50 on the downstream side of the confirmation gas X from each detection valve 51. A total of 52 is provided, and an exhaust valve 53 for exhausting the confirmation gas X remaining in the confirmation gas guide pipe 50 is provided.

In this case, the detection valve 51 is normally closed, and when the switch member 51a is pushed in, the detection valve 51 opens.

Then, in this embodiment, as shown in FIG. 1A, each of the manual opening / closing levers 31a is tilted downward to open each opening / closing valve 31, and the fuel G is passed through each fuel supply pipe 30. In the state of being supplied to each burner 20 and burned, the manual opening / closing lever 31a in each opening / closing valve 31 is separated from the switch member 51a in each detection valve 51, and each detection valve is in a state of being separated from the switch member 51a. 51 is closed, and the confirmation gas X is not guided to the pressure gauge 52 through the confirmation gas guide pipe 50.

On the other hand, as shown in FIG. 1 (B), all the manual opening / closing levers 31a are rotated upward from the state of being tilted downward to become horizontal, all the opening / closing valves 31 are closed, and the fuel G is used. Is not supplied to all the burners 20 and combustion is stopped, the switch member 51a in the detection valve 51 is pushed by the manually opened / closed lever 31a rotated upward, and all the detections connected in series are detected. The valve 51 is opened, and the confirmation gas X is guided to the pressure gauge 52 through the confirmation gas guide pipe 50 to which the detection valve 51 is connected in series, and the value of the pressure gauge 52 rises. By doing so, it is detected that all the burners 20 are extinguished. It is not detected that even one burner 20 is burning.

Further, as shown in FIG. 2, in a state where a part of the manual opening / closing lever 31a in each of the opening / closing valves 31 is tilted downward instead of in a horizontal state, the opening / closing valve 31 in this portion opens to fuel. In a state where G is supplied from the fuel supply pipe 30 to the burner 20 through the on-off valve 31 and combustion is performed, the manual on-off lever 31a in the on-off valve 31 is from the switch member 51a in the corresponding detection valve 51. Since the detection valve 51 is closed in a separated state, the flow of the confirmation gas X is stopped by the detection valve 51, the confirmation gas X is not guided to the pressure gauge 52, and the pressure is increased. Since the value of 52 does not increase, it can be seen that the combustion by all the burners 20 has not been stopped (the burner 20 somewhere has not been extinguished yet).

Then, by detecting that the confirmation gas X is guided through the confirmation gas guide pipe 50 due to the increase in the value of the pressure gauge 52 as described above, all the on-off valves 31 are closed and the fuel is fueled. G will not be supplied to all the burners 20, and it will be possible to easily and surely detect that the combustion in all the burners 20 has stopped.

Further, by detecting that the confirmation gas X was guided through the confirmation gas guide pipe 50 due to the increase in the value of the pressure gauge 52 as described above, all the burners 20 were extinguished and the combustion G flowed out. Make sure that you have not done so, and start maintenance work.

Then, after the maintenance work is completed, the manual opening / closing lever 31a is tilted downward to open the opening / closing valve 31, and before the fuel G is supplied from the fuel supply pipe 30 to the burner 20 and burned. In this embodiment, in order to prevent the pressure of the confirmation gas X remaining in the confirmation gas guide tube 50 from remaining detected by the pressure gauge 52, the confirmation valve 51 is used for confirmation. The exhaust valve 53 provided on the downstream side of the gas guide pipe 50 is opened, the confirmation gas X remaining in the confirmation gas guide pipe 50 is exhausted, the value of the pressure gauge 52 is restored, and then the exhaust valve is used. Try to close 53.

In this embodiment, as a safety confirmation before the maintenance of the industrial furnace, the case where it is detected whether or not all the burners 20 have stopped burning has been described as an example, but other uses include. As a safety confirmation before igniting the burner 20 at the start of operation of the industrial furnace, it is possible to detect whether all the on-off valves 31 are closed and the fuel G is not leaked into the furnace 10. ..

10: Furnace 11: Furnace wall 20: Burner 30: Fuel supply pipe 31: Open / close valve 31a: Manual opening / closing lever 40: Air supply pipe 50: Confirmation gas guide pipe 51: Detection valve 51a: Switch member 52: Pressure gauge (Detection device)
53: Exhaust valve Air: Air G: Fuel X: Confirmation gas

Claims (3)

In an industrial furnace equipped with multiple burners that mix and burn fuel and combustion air, each fuel supply pipe that supplies fuel to each burner is equipped with an open / close valve equipped with a manual open / close lever, while checking. A confirmation gas guide pipe for passing the gas is provided, and the switch member is operated to open / close the switch member by the operation of the manual opening / closing lever in the opening / closing valve provided in each fuel supply pipe in the confirmation gas guide pipe. When the valve is provided in series corresponding to the on-off valve and the on-off valve is opened by the manual on-off lever to supply fuel to the burner, the switch member is operated by the manual on-off lever to operate the switch member. The manual opening / closing lever closes the detection valve to prevent the confirmation gas from flowing, while the manual opening / closing lever closes the opening / closing valve to stop the supply of fuel to the burner. The switch member of the above is operated, the detection valve is opened to allow the confirmation gas to flow through the detection valve, all the on-off valves are closed, all the detection valves are opened, and the above-mentioned An industrial furnace characterized by being equipped with a detection device that detects the confirmation gas flowing through the confirmation gas guide pipe. The industrial furnace according to claim 1, wherein the detection device is provided with a pressure gauge for detecting the flow of the confirmation gas through the confirmation gas guide pipe. In the fuel supply / stop detection device that detects the supply / stop of fuel by the fuel supply pipe, the fuel supply pipe is provided with an open / close valve provided with a manual opening / closing lever, while the confirmation gas guide for passing the confirmation gas. The pipe is provided with a detection valve in series in which the switch member is operated to open and close by the operation of the manual open / close lever in the open / close valve provided in the fuel supply pipe, and the open / close valve is opened by the manual open / close lever. When the fuel is supplied by the fuel supply pipe, the switch member is operated by the manual opening / closing lever to close the detection valve to prevent the confirmation gas from flowing, while the manual opening / closing is performed. When the open / close valve is closed by the lever to stop the supply of fuel to the burner, the switch member is operated by the manual open / close lever, the detection valve is opened, and the confirmation gas flows through the detection valve. A fuel supply / stop detection device, characterized in that a detection device for detecting the confirmation gas flowing through the confirmation gas guide tube is provided.

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