JPH0210101Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a liquid injection device from a blast furnace tuyere.
In particular, the present invention relates to a liquid blowing device in which the liquid blowing nozzle is not directly exposed to hot air and can blow at a low flow rate, and is used in the field of blast furnace operation.

[Conventional technology]

Conventionally, humidity-controlled air blowing has been performed as part of the stable operation of blast furnaces, and this is a method of controlling the furnace heat of the blast furnace by blowing humidity-controlled steam together with hot air through the tuyeres. Conventionally, this addition of moisture was controlled by blowing an appropriate amount of steam into the air in the blast pipe sent to the hot air stove, but the thermal energy for heating the moisture in the hot air stove was This is a loss from the point of view, and also results in highly humid air flowing into the hot air stove, which is also unfavorable from the viewpoint of the life of the refractory of the hot air stove.

Therefore, a method has been adopted in which water is blown directly into the blast furnace from a nozzle attached to the blow pipe of the blast furnace tuyere. This prior art includes Utility Model Publication No. 58-676 and Japanese Patent Publication No. 58-1163. In all of these devices, the nozzle of the water supply pipe opens into the blowpipe, and an example thereof is shown in FIG. 3. That is, the blow pipe 6 of the blowing branch pipe is connected to a large number of tuyeres 4 arranged around the blast furnace wall 2.
A water blowing nozzle 10 is installed in the hot air passage 8 so that the nozzle tip 12 can face the vicinity of the tuyere 4. However, in this device, the tip 12 of the water supply nozzle is exposed to hot air, and when the amount of water blown is small, the water boils, causing handing, and the water cannot be blown in stably. Furthermore, there is a problem in that the Ca content of the blown water becomes scale and sticks to the inner surface of the nozzle 10, causing blockage. Recent large blast furnaces have 30 tuyeres.
~40 pieces, and if it is not possible to inject at a small flow rate with one tuyere due to the above problems, it is necessary to inject at intervals from the viewpoint of furnace heat control, and thus the blast furnace tuyere There are tuyeres that inject water in the circumferential direction of the mouth and tuyeres that do not, creating a temperature difference of 200 to 250°C in the combustion temperature before the tuyeres, making it difficult to maintain stable operation of the blast furnace. There was a problem that made it difficult.

[Problem that the invention attempts to solve]

An object of the present invention is to solve the problems of the prior art described above and to provide a device for blowing water from a blast furnace tuyere, which is capable of stably blowing water even when the amount of water blown is small.

[Means and actions for solving problems]

The gist of the present invention is as follows.
That is, in a device for blowing liquid into the blast furnace by providing a liquid supply pipe in a blow pipe of a blast furnace tuyere, a blast furnace characterized in that the liquid discharge position of the liquid supply pipe is located outside the blow pipe. This is a liquid injection device from the tuyere.

Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an example showing an embodiment of the present invention. A tuyere cover 14 is provided on the outside of the blow pipe 6 connected to the tuyere 4, and a water blowing device 16 according to the present invention is provided through the tuyere cover 14.

The water blowing device 16 is constructed as follows. That is, a spray nozzle 20 is provided inside the connecting pipe of the water supply pipe made of the flexible hose 18, and the spray nozzle 20 is inserted through the tuyere cover 14 to form the blow pipe 6.
The spray water is connected to a guide pipe 21 that reaches the inside of the spray water. A stopper or shutoff valve 22 is provided on the outside of the tuyere cover 16 in the middle of the guide pipe 21 to prevent hot air from leaking. The stopper 22 is a manual on-off valve, and a blind plate can block the passage in the guide pipe 21 by rotating the lever. Tuyere cover 14
Since the inside of the guide pipe 21 is exposed to hot air, it is lined with casters made of amorphous refractory material, and the inside of the guide pipe 21 is also lined with casters so that even if the blown water drips, it can be guided safely into the furnace. Note that the guide pipe 21 can be omitted if the distance from the corner A of the blow pipe to the tuyere cover 14 is short.

A feature of the present invention is that the spray nozzle 20 is provided outside the blow pipe 6 and outside the stopper 22. With this configuration, water can be discharged and sprayed in an atmosphere close to room temperature, so that even a low flow rate of water can be stably blown into the tuyere. Furthermore, even if water blowing is stopped for some reason, blowing out of the hot air in the blow pipe 6 can be prevented by rotating the stopper 22.

Another embodiment of the present invention will be explained using the example shown in FIG. In this case as well, the spray nozzle 20 is provided outside the blow pipe 6, and the guide pipe 21 penetrates the tuyere cover 14 and enters the blow pipe 6 obliquely.
An opening 24 having a slope in the center of the blow pipe 6
have. The construction of the water blowing device 16 is similar to the embodiment shown in FIG. In this case, a viewing window 26 is provided at the center of the tuyere cover 14. The viewing window 26 has a built-in heat-resistant glass and lens similar to the viewing window of the conventional tuyere 4, so the guide pipe 21
In addition to the water spray from the tip of the tube, the combustion and reaction conditions inside the furnace can be observed through the tuyeres 4.

Although the embodiments of the present invention have been described in the above two embodiments, the water blowing device according to the present invention is limited to the above two embodiments as long as the water blowing position of the liquid supply pipe is located outside the blow pipe 6. Of course, other embodiments are also possible, and the water blowing device may have a straight pipe section or a curved pipe section. Further, the blowing device of the present invention is not limited to water, and can be similarly applied to blowing other liquid substances.

[Effect of idea]

In view of the problems of the conventional technology in liquid blowing devices from blast furnace tuyere, the present invention has a structure in which the liquid discharge position of the liquid supply pipe is located outside the blow pipe, so that the following effects can be achieved. did it.

(b) Since the blown liquid is not exposed to the hot air in the blow pipe, boiling of the liquid can be avoided even at low flow rates.
Or, the blowing channel will not be blocked.

(b) Since the liquid blowing device according to the present invention can discharge and spray liquid in an atmosphere close to room temperature, stable continuous operation is possible even with liquid blowing at a low flow rate of about 10 times per hour.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of a device for blowing liquid from a blast furnace tuyere according to the present invention, Fig. 2 is a sectional view showing another embodiment of the invention, and Fig. 3 is a conventional water injection device. It is a schematic cross-sectional view. 2... Blast furnace furnace wall, 4... Tuyere, 6... Blow pipe,
8... Hot air passage, 14... Tuyere cover, 16... Water blowing device, 18... Flexible hose, 20... Spray nozzle, 21... Guide pipe, 22... Stopper,
24...Opening, 26...Peep window.

Claims (1)

[Scope of utility model registration request] A device for blowing liquid into the blast furnace by providing a liquid supply pipe in a blow pipe of a blast furnace tuyere, characterized in that the liquid discharge position of the liquid supply pipe is located outside the blow pipe. Liquid blowing equipment from.