JPH06241453A - Furnace top ignition burner for blast furnace - Google Patents

Abstract

PURPOSE:To effectively ignite and to improve safety by providing an ignition spark plug in a space between an outlet of an outer tube and an outlet of an inner tube, providing a flame failure detecting sensor ahead of the plug, and outputting a shut-off signal to a gas fuel solenoid shut-off valve according to a flame failure detection signal from a controller for instructing to ignite the plug. CONSTITUTION:An ignition spark plug 3 is provided in a space between an outer tube 1 and an inner tube 2 of a furnace top ignition burner, and a flame failure detecting sensor 5 is arranged inside a flame diffuser 4 ahead of the plug 3. The plug 3 is connected to a controller 15 via a cable 3 and the sensor 5 is connected to the controller 15 via a lead 14. Combustion air is supplied from a combustion air main valve 8, and fuel gas to be supplied from a fuel gas tube 10 is ignited by the plug 3. When the sensor 5 detects flame failure, it inputs a detection signal to the controller 15 to urgently shut OFF a fuel gas solenoid shut-off valve 11 and to inform it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a furnace top firing apparatus for a blast furnace.

[0002]

2. Description of the Related Art Generally, in a blast furnace, air blow to the blast furnace is stopped when the blast furnace body or incidental equipment is broken down or repaired. At this time, flammable gas is discharged from the raw material in the furnace into the space at the top of the furnace. Since it is generated, stays, and there is a danger of explosion, a method is adopted in which an ignition burner is provided to ignite and burn the combustible gas.

Regarding this ignition burner, for example, Japanese Utility Model Laid-Open No. 57-199764 discloses a furnace top fire burner misfire prevention device (see FIGS. 3 and 4). 3 is an explanatory view of the furnace top fire burner misfire prevention device, FIG. 4 is an explanatory view of the burner tip portion, 1 is a furnace top burner outer tube, 17 is a support truck for the furnace top burner outer tube, 9 is a flexible air hose for combustion, 12 is a flexible hose for fuel gas, 2
Is a furnace top burner inner tube, 4 is a flame outlet, 6 is a combustion air passage space, 25 is an ignition heater, and 26 is an ignition heater wiring.

That is, the outlet of the inner pipe 2 of the inner and outer double pipes arranged concentrically is provided close to the inner side of the outlet of the outer pipe 1, and the fuel gas is caused to flow in the inner pipe 2 so that the outer pipe 1 and the inner pipe 2 Combustion air is caused to flow in the annular space 6 between the two and burned outside the outlet of the outer tube 1,
A furnace apex burner in which an ignition heater 25 composed of a heating wire connected to a power supply circuit is arranged in the space between the outlet of the outer tube 1 and the outlet of the inner tube 2 is inserted into the furnace top space to ignite and combust combustible gas. It is a device.

[0005]

However, in the furnace top fire burner misfire prevention device disclosed in Japanese Utility Model Laid-Open No. 57-199764, an ignition heater 25 composed of a heating wire is used as a means for igniting the combustion gas of the burner. However, if the fuel gas and the combustion air are circulated to the inner pipe 2 and the outer pipe 5 while the heater 25 is red-hot, the ignition heater 25 is cooled by the flow of gas and air, and the ignition is surely performed. There was a problem that it was not done in many cases. Further, there is a problem that unburned fuel gas flows out into the space at the top of the furnace at the time of misfire because there is no danger of gas explosion because the burner that has ignited does not have a detection device for misfire due to some reason.

An object of the present invention is to provide a furnace top fire burner for a blast furnace which solves the above-mentioned problems and enables reliable ignition and is safe.

[0007]

According to the present invention, an inner pipe outlet of an inner-outer double pipe is provided close to an inner side of an outer pipe outlet, a fuel gas is flown into the inner pipe, and the outer pipe and the inner pipe are connected to each other. An ignition spark provided in a space between the outer pipe outlet and the inner pipe outlet, in a furnace top firing apparatus of a blast furnace having a burner of a type in which combustion air is flown in a space between the outer pipe outlet and burned outside the outer pipe outlet. A plug, and a misfire detection sensor provided in front of the ignition spark plug,
An electromagnetic shutoff valve for fuel gas provided in the fuel gas supply pipe, a function for issuing an ignition command signal to the ignition spark plug, and a shutoff signal output to the electromagnetic shutoff valve for fuel gas according to a misfire detection signal from the misfire detection sensor A furnace top fire burner device for a blast furnace, comprising: a control device having a function for performing a fire and a function for issuing a misfire alarm.

[0008]

According to the present invention, the inner pipe outlet of the furnace top fire burner is provided close to the outer pipe outlet, and the spark plug for ignition connected to the power circuit is provided in the space between the inner pipe outlet and the outer pipe outlet. Since the tip is provided, it is possible to reliably ignite by sparking by flowing the fuel gas through the inner pipe while the spark plug is activated.

Further, by disposing the misfire detection sensor in the space between the inner pipe outlet and the outer pipe outlet, the presence or absence of flame can be constantly monitored, and the fuel gas is immediately supplied to the fuel gas electromagnetic shutoff valve by the misfire detection sensor. It is possible to prevent the explosion by shutting off the fuel gas.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing the outline of the furnace top firing apparatus of the present invention. 1 is a furnace top fire burner outer tube, 2 is a furnace top fire burner inner tube, 3 is an ignition spark plug, 4 is a flame outlet, 5 is a misfire detection sensor, 6 is a combustion air passage space, 7
Is a combustion air pipe, 8 is a combustion air source valve, 9 is a combustion air flexible hose, 10 is a fuel gas pipe, 11 is a fuel gas electromagnetic cutoff valve, 12 is a fuel gas flexible hose, 13
Is a spark plug cable for ignition, 14 is a lead wire for a misfire detection sensor, 15 is a control device, and 16 is control wiring for a fuel gas electromagnetic shutoff valve.

In the figure, the furnace top burner is an outer tube 1 and an inner tube 2.
And the tip of the inner tube 2 is disposed in close proximity to the outer flame outlet 4 of the outer tube 1 with a space, and the tip of the spark plug 3 for ignition is generated. It is arranged close to the outlet in the inner pipe 2, and the tip of the misfire detection sensor 5 is arranged inside the flame outlet 4. The ignition spark plug 3 penetrates the rear end of the outer tube 1 via the cable 13 and is connected to the control device 15, and the misfire detection sensor 5 is fixed to the rear end of the outer tube 1 and controlled via the lead wire 14. Connected to device 15.

Combustion air is supplied by a combustion air source valve 8 of an air pipe 7 through a flexible hose 9 connected to the rear portion of the outer pipe 1. The fuel gas is supplied from the fuel gas pipe 10 through the fuel gas electromagnetic cutoff valve and through the flexible hose 12 for fuel gas connected to the rear end of the inner pipe 2 fixed through the rear end of the outer pipe 1. It

At the time of misfire, the misfire detection sensor 5 detects a temperature drop, and the fuel gas electromagnetic shutoff valve 11 is urgently shut off via the control device 15, the supply of fuel gas is stopped, and a misfire alarm is sent to the operator and the operating room. be able to. With the furnace top firing apparatus of the present invention described above, the blast furnace can be ignited more safely and efficiently.

Next, FIG. 2 is an explanatory view showing a state in which the furnace top fire burner device of the present invention is installed at the top of the blast furnace. In the figure, the furnace top iron skin 23 at a position located above the furnace raw material 23
, A pipe seat 20 and a valve 21 for inserting the furnace top fire burner.
Is installed and the valve 21 is opened when the blast furnace is in a blast, and the furnace top fire burner is installed inside the furnace from the outside of the furnace through the tube seat 20. The furnace top fire burner is suspended and held by a support carriage 17 on a support frame 18 fixed to a lower portion of a work deck 19 so as to be horizontally movable. The furnace top fire burner and its complete set of ancillary equipment are located on the middle deck 24 to enable efficient work.

After the gas in the furnace is ignited by the furnace top burner,
The supply of fuel gas to the furnace top fire burner is stopped, the furnace top fire burner is pulled out, and the valve 21 is closed to complete the process. It is also possible to perform this series of work unattended by linking the control device 15 and the support carriage 17.

[0016]

As described above, in the furnace top fire burner apparatus of the present invention, the inner pipe outlet of the furnace top fire burner is provided in the vicinity of the outer pipe outlet, and the space between the inner pipe outlet and the outer pipe outlet is provided. Since the tip of the spark plug for ignition connected to the power supply circuit is installed, it is possible to reliably ignite by spark by flowing fuel gas to the inner pipe with the spark plug activated, and it is also possible to detect misfire. By arranging the sensor in the space between the inner pipe outlet and the outer pipe outlet, it is possible to constantly monitor the presence or absence of a flame, and it is possible to immediately shut off the fuel gas by the misfire detection sensor and prevent the explosion due to the outflow of the fuel gas. .

Furthermore, if a series of auxiliary equipment is linked with the support carriage of the embodiment, unmanned operation is possible.

[Brief description of drawings]

FIG. 1 is a side view showing an outline of a furnace top fire burner device.

FIG. 2 is an explanatory view showing a state in which a furnace top fire burner device is installed at the top of a blast furnace.

FIG. 3 is an explanatory view showing a conventional furnace top fire burner misfire prevention device.

FIG. 4 is an enlarged view of part B of FIG.

[Explanation of symbols]

 1 furnace top fire burner outer tube 2 furnace top fire burner inner tube 3 ignition spark plug 4 flame outlet 5 misfire detection sensor 6 combustion air passage space 7 combustion air pipe 8 combustion air source valve 9 combustion air flexible hose 10 Fuel gas pipe 11 Electromagnetic shutoff valve for fuel gas 12 Flexible hose for fuel gas 13 Spark plug cable for ignition 14 Lead wire for misfire detection sensor 15 Control device 16 Control wiring for electromagnetic shutoff valve 17 Furnace top burner support cart 18 Support frame 19 Working Deck 20 Furnace Top Burner Tube Seat 21 Valve 22 Furnace Top Steel 23 In-furnace Material 24 Middle Deck 25 Ignition Heater 26 Ignition Heater Wiring

Claims (1)

[Claims] 1. An inner pipe outlet of an inner-outer double pipe is provided close to the inner side of the outer pipe outlet to let a fuel gas flow in the inner pipe and to supply combustion air to a space between the outer pipe and the inner pipe. In a furnace top firing apparatus of a blast furnace having a burner of a type that flows and burns outside an outer pipe outlet, an ignition spark plug provided in a space between the outer pipe outlet and the inner pipe outlet, and the ignition spark plug. Of the fuel by the misfire detection signal from the misfire detection sensor, the function of issuing an ignition command signal to the spark plug for ignition, the electromagnetic cutoff valve for fuel gas provided in the fuel gas supply pipe, the spark plug for ignition. A furnace top fire burner device for a blast furnace, comprising: a control device having a function of outputting a shutoff signal to a gas electromagnetic shutoff valve and a function of issuing a misfire alarm.