JPH0339476Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a furnace top ignition device that ignites gas generated from inside the blast furnace when the blast furnace is shut down in order to combust it at the furnace mouth at the top of the furnace.

(Constitution of Prior Art and Its Problems) The furnace top flame of a blast furnace is intended to burn gas generated from inside the furnace and release it outside the furnace to prevent the generated gas from exploding. Conventionally, as shown in FIG. 5, the furnace top bleeder valve 23 and the like at the upper end of the riser pipe 22 are fully opened after the blast furnace 20 is in a rest state, and the furnace top steam port 24 is brought into the furnace mouth. 21 to replace the gas at the furnace mouth 21, and after sufficient replacement, the steam is stopped, the manhole 25 is opened, the ignition burner 26 is inserted into the furnace, and the gas generated from inside the furnace is ignited. It was burning. In addition, the special public service in 1983
Publication No. 21083 discloses a furnace top charging device in which an ignition burner is integrally attached, so that the operation of inserting the ignition burner through a manhole can be omitted.

However, when the ignition burner 26 is inserted, the furnace opening 2
Since the gas temperature in No. 1 was low at around 70-90°C, it took 1-3 hours for the gas in the furnace to ignite. As a result, wind downtime was sometimes longer than planned, and scheduled construction work could not be completed. In addition, this is a problem in the case of Japanese Patent Publication No. 55-21083 as well, unless the amount of air or oxygen gas sent out from the ignition burner can be drastically increased, and due to the size constraints of the ignition burner, it is not practical to do so. It is impossible.

(Purpose of the invention) The object of the present invention is to solve the above-mentioned conventional problems and provide a furnace top ignition device that can quickly ignite gas generated from inside the furnace at the furnace mouth.

(Structure of the invention) For this purpose, the present invention provides a furnace top ignition device that is equipped with an ignition burner facing into the furnace mouth at the top of the blast furnace, and a forced air blower that forcibly sends air or oxygen gas to the furnace mouth. According to this, by sending air or oxygen gas into the furnace mouth using a forced air blower, the problem of difficulty in igniting due to lack of oxygen for combustion can be solved, and the combustion can be quickly ignited. It is possible.

(Description of Examples) Examples of the present invention will be described below with reference to FIGS. 1 to 4. In FIGS. 1 and 2, 1 is the top of the blast furnace, and manholes 3 are formed on all sides at the upper outer periphery of the furnace mouth 2, and rising pipes 4 extend upward from the positions between these manholes 3. has been done. Further, a lower bell 5 for opening and closing the material charging opening is disposed at the upper center of the furnace mouth portion 2. An ignition burner 6 is inserted into the furnace mouth part 2 from the manhole 3, and a blower 7 for forcibly feeding air into the furnace mouth part 2 is installed in another manhole 3. An ignition device is configured to ignite the gas generated from within. The blower 7
is configured to be movable and includes a bent discharge nozzle 7a that blows air toward the central lower part of the furnace mouth portion 2.

In the above configuration, when the blast furnace is closed, the riser pipe 4
Open the furnace top bleeder valve (not shown) at the upper end, and introduce steam into the furnace mouth section 2 from the furnace top steam port (not shown) to replace the gas in the furnace mouth section 2. After sufficient replacement, steam is removed. Then, open the required manhole 3, insert the ignition burner 6, and install the blower 7 in the manhole 3 so that its discharge nozzle 7a points toward the center of the lower part of the furnace opening 2. The ignition burner 6 is operated while feeding oxygen gas into the center of the lower part of the furnace mouth part 2. Then, conventionally 1~
The gas in the furnace ignited in about 20 minutes after the ignition burner 6 was inserted, although it had been there for three hours. This is because sufficient combustion air or oxygen gas can be quickly supplied to the ignition position at the tip of the ignition burner 6.

As the blower 7, as shown in FIG.
The blower main body 8 is attached to a support base 9 so that its angle can be adjusted, and a discharge nozzle 10 that is bent and extends from the blower main body 8 has elastic parts 11a and 1 at the base and tip, respectively.
It is preferable to use a structure in which the ignition burner 1b is provided because air or the like can be accurately sent toward the tip of the ignition burner 6 in response to changes in the surface position of the charged material.

Furthermore, the means for feeding air or oxygen gas is not limited to the blower 7, as shown in FIG. As shown, an air supply pipe 13 that penetrates the peripheral wall of the furnace opening 2
It may also be sent through.

(Effects of the invention) According to the furnace top ignition device of the present invention, as described above, since it is equipped with a forced air blower that forcibly sends air or oxygen gas to the furnace mouth, there is sufficient combustion air at the ignition position. Alternatively, oxygen gas can be supplied and ignition can be performed quickly even if the gas temperature at the furnace mouth is low, resulting in a shortened furnace top firing time.
The scheduled wind down time can be shortened and the schedule can be planned with high accuracy.

[Brief explanation of drawings]

Fig. 1 is a schematic longitudinal sectional front view of the main parts showing one embodiment of the present invention, Fig. 2 is a plan view of the same, Fig. 3 is a front view of another embodiment of the blower, and Fig. 4 is another embodiment. 1st of
FIG. 5 is a longitudinal sectional front view of the conventional example. 1... Furnace top of blast furnace, 2... Furnace mouth, 3... Manhole, 6... Ignition burner, 7... Blower (forced air device), 12, 13... Air supply pipe (forced air device).

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A blast furnace characterized by being equipped with an ignition burner facing into the furnace mouth at the top of the blast furnace, and a forced air blower for forcibly feeding air or oxygen gas into the furnace mouth. Furnace top fire device. (2) The furnace apex of the blast furnace according to claim 1, wherein the forced air blower is constituted by a movable blower equipped with an angle-adjustable and extendable discharge nozzle. Fire device.