JPH04362108A - Device for spraying water in blast furnace - Google Patents

Abstract

PURPOSE:To allow the smooth conduction of the blow-down operation to lower the stock line while suppressing the water gas reaction of cooling water and red hot coke without requiring excessively increasing a cooling capacity and without inducing troubles, such as clogging of tuyeres. CONSTITUTION:This device for spraying water into a blast furnace is constituted by providing water feed pipings 2 at prescribed intervals in a circumferential direction and freely movably upward and downward within the perpendicular plane parallel with the axial line of the blast furnace and fixing water spraying nozzles 1 directing the furnace top direction to the front ends of these water feed pipings.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water sprinkling device inside a blast furnace, and more particularly to a water sprinkling device for sprinkling water inside a blast furnace during reduced-scale wind rest and reduced-scale blowdown.

0002

[Prior Art] Conventionally, the problem with performing reduced-scale blowdown in blast furnace operation is that in order to protect the top equipment while maintaining the hot metal temperature, the top gas temperature must be maintained below a certain temperature. It's in a place where it shouldn't be. As a measure to solve this problem, cooling is performed using a plurality of fixed water spray nozzles inserted into the furnace from the top of the furnace. An example of this is Utility Model Application No. 62-194747.

[0003] When spraying water, the range of water spraying, the amount of water to be sprayed, the size of water droplets, etc. are selected in order to efficiently cool the high-temperature furnace gas rising from the bottom of the blast furnace. A conventional water sprinkler device will be explained below.

FIG. 2 shows an example of a conventional blast furnace top watering system, in which 1 is a watering nozzle, 2 is a water supply pipe, 8 is a lower bell, 10 is a furnace top shell, 11 is a bell cup, and 12 is an ore. 15 indicates a movable armor. Figure 3 (
(a) shows the water sprinkling situation in the vertical cross-sectional direction inside the reactor in the conventional technology, (b) is a cross-sectional view (furnace chest) taken along the line A-A in the same figure (a),
(c) shows a cross-sectional view (furnace belly) taken along the line B-B in FIG. 1 (a). In the figure, 1 is the water nozzle, 2 is the water supply pipe, 5 is the charge level, 6 is the spray water, 7 is the water spray range, 8 is the lower bell, 10 is the furnace top shell, 11 is the bell cup, and 13 is the blade. mouth, 1
4 each indicates a raceway.

In the water sprinkling device shown in FIG. 2, the water sprinkling nozzle 1 is fixed to the tip of the water supply pipe 2 so as to face the furnace bottom, so that the water sprinkling area 7 is constant. FIG. 3 shows this situation. Fig. 3 shows an example in which four water spray nozzles 1 are arranged in the circumferential direction, and Fig. 3 (a) shows the spray water 6 sprayed in a fan shape from the water spray nozzles 1, and Fig. 3 (b) As shown in FIG. 2, the spraying range 7 of the spray water 6 is non-uniform, and there are considerable portions on the outer periphery of the spraying range 7 that are not sprayed with water. Also,
Figure (c) shows the state of water sprinkling in the reactor abdomen, and although the water spray range 7 of the spray water 6 almost covers the inside of the reactor, the water spray range 7 is non-uniform.

[0006] As described above, in the conventional apparatus, the spray water 6 cannot uniformly cover the rising gas in the furnace, making it difficult to achieve the desired efficient cooling.

[0007]

[Problems to be Solved by the Invention] By the way, when using a fixed water spray nozzle as described above, the range of cooling water that covers the rising gas in the furnace changes depending on the drop in the charge level. There will be a bias in ability.

For this reason, when the amount of water sprinkled is increased to improve the insufficient cooling capacity, the cooling water cannot be completely vaporized during the cooling process of the rising gas in the furnace, and locally reaches the contents in the furnace, damaging the charges. It will cool down. Therefore, the charge is not fully melted, and the cooling water and red-hot coke come into contact, causing a water gas reaction H2 O+C→CO+H2, and while coke is being consumed, CO in the top gas is
In order to increase the H2 concentration, if a situation were to occur in which oxygen could enter the furnace (such as cracks in the steel shell), there was a risk that it would fall within the explosive limit.

Furthermore, as shown in FIG. 3(a), when the charge level 5 is below the furnace belly, the cooling water directly hits the furnace wall and flows along the furnace wall to the front of the tuyere 13. It may descend. At this time, the cooling water causes troubles such as slag boiling or tuyere clogging due to solidification of the slag, which impedes the smooth blowing and unloading operation. One way to avoid this is to use water spray nozzles arranged diametrically, but it is difficult to make adjustments that do not spray cooling water onto the furnace wall and maintain efficient water spray conditions. there were.

0010

[Means for Solving the Problems] In view of the above-mentioned problems, the present invention aims to uniformly cool the gas in the furnace in accordance with the drop in the charge level in the water sprinkler inside the furnace. It was completed as a result of extensive research and consideration, and its gist is that water supply pipes are installed at predetermined intervals in the circumferential direction and in a vertical plane parallel to the axis of the blast furnace, so that they can be raised and lowered freely. This is an in-blast furnace water sprinkling device in which a water sprinkling nozzle oriented toward the top of the furnace is fixed to the tip of this water supply pipe.

[0011]

[Operation] During water sprinkling, the water nozzle fixed to the tip of the water supply pipe is placed above and below the furnace body in a vertical plane parallel to the axis of the blast furnace, so as to suppress changes in the water sprinkling range as the charge level falls. water from the water nozzle pointing toward the top of the furnace. This allows the cooling water to completely cover the rising gas in the reactor, and since the cooling water is ejected toward the top of the reactor, the gas can be uniformly cooled during rising and descending. It evaporates before it reaches the object.

Therefore, there is no need to increase the cooling capacity excessively, the cooling water can be used effectively, the cooling water does not reach the contents in the reactor, and the process is proceeding smoothly without causing troubles such as tuyere clogging. It is possible to carry out reduced-length blow-off work.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to illustrated embodiments. FIG. 1 shows an embodiment of the blast furnace water sprinkling system according to the present invention, in which 1 is a water spray nozzle, 2 is a water supply pipe, 3 is a water supply pipe support, 4 is a sealing device, 5 is a charge level, 6
is the spray water, 7 is the watering range, 8 is the lower bell, 9 is the upper bell, 1
0 is top shell, 11 is bell cup, L is charge level 5
and the distance from the water spray nozzle 1, respectively.

The water spray nozzle 1 is attached upward to the tip of the water supply pipe 2, and the attachment angle is variable. The water supply pipe 2 is vertically installed inside the furnace via a water supply pipe support 3 attached to the furnace top shell 10, and is connected to a vertical drive device (
(not shown) can be moved up and down.

Furthermore, the water supply pipe 2 is connected to a main water supply pipe via a flexible hose (not shown) and a water flow control valve (not shown). A gap between the water supply pipe 2 and the water supply pipe support 3 is sealed by a sealing device 4.

The cooling water passes through a water flow control valve, a flexible hose, a water supply pipe 2, and is ejected as spray water 6 from a water spray nozzle 1. Further, the amount of cooling water is adjusted according to the charge level 5.

During the reduced-length blowdown, the water supply pipe 2 descends in accordance with the fall of the charge level 5 while maintaining the distance L between the charge level 5 and the water spray nozzle 1 at a certain constant value. In addition, the upward angle of the water spray nozzle 1 is also at charge level 5.
Adjust according to the drop.

As a result, the spray water 6 ejected upward from the water nozzle 1 can be optimally cooled with gas according to the charge level 5. That is, the spray water 6 ejected upward cools the gas and vaporizes it as it ascends and descends. Therefore, the spray water 6 does not reach the surface of the charge without being vaporized.

FIG. 1(b) shows the spray range 7 of the spray water 6 when four water supply pipes 2 are provided in the circumferential direction and water is sprayed from the four water spray nozzles 1. are substantially concentric circles, and the spray water 6 can uniformly cool the rising gas without wetting the furnace wall. Depending on the charge level, it is effective to use the conventional fixed furnace top water sprinkler system in combination with this system to cool the rising gas in the furnace.

[0020]

[Effects of the Invention] As explained above, the blast furnace water sprinkling device according to the present invention allows the position of the water nozzle to be moved at will in the vertical direction of the furnace body within a vertical plane parallel to the axis of the blast furnace. The cooling water can be atomized to completely cover the rising gas in the furnace, and the gas can be cooled uniformly.

[0021] Therefore, the present water sprinkler does not require excessively increasing the cooling capacity, and can suppress the water gas reaction between the cooling water and the red-hot coke, which also prevents troubles such as tuyere clogging. This has the excellent effect of allowing smooth unloading work of reduced length without any problems.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an in-blast furnace water sprinkling device according to the present invention.

FIG. 2 is a diagram showing an example of a conventional blast furnace top watering device.

[Fig. 3] (a) shows the water sprinkling situation in the vertical cross-sectional direction of the reactor in the conventional technology, (b) shows the sectional view (furnace chest) taken along the line A-A in Fig. It is a figure which shows the BB line sectional view (furnace part) of a).

[Explanation of symbols]

1... Water nozzle, 2... Water supply pipe, 3... Water supply pipe support, 4... Seal device, 5... Charge level, 6... Spray water,
7... Watering range, 8... Lower bell, 9... Upper bell, 10... Furnace top shell, 11... Bell cup, 12... Ore receiver, 13... Tuyere, 14... Raceway, 15... Movable armor, L
...distance between charge level and watering nozzle.

Claims (1)

[Claims] Claim 1: Water supply pipes are provided at predetermined intervals in the circumferential direction and in a vertical plane parallel to the axis of the blast furnace, and are movable up and down, and a water spray nozzle oriented toward the top of the furnace is fixed to the tip of the water supply pipe. An in-blast furnace water sprinkling device that is characterized by: