JPH09157715A - Device for fitting lance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fitting device of a lance which can safely and easily change the blowing lance, etc., even during operation. SOLUTION: The device constituted by connecting a furnace gas shut-off means which is connected with two pieces of shut-off valves 12, 14, with a seal gas blowing short pipe 13 in-between with the rear end of a seal gas pipe 11 for inserting the lance and connecting a gas seal means 15 for gas-sealing a gap between the outer periphery of the lance and the seal gas pipe, with the rear end of the gas shut-off means, is fitted to the gas blowing pipe. By this constitution, at the time of changing the lance, etc., the leakage of gas from the inserting hole can be prevented and the blowing lance, etc., can safely and easily be changed even during the operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting device for mounting a fuel injection lance and a lance for mounting a measuring device or monitoring means on a gas injection pipe such as a blow pipe of a metallurgical furnace, particularly a blast furnace. .

[0002]

2. Description of the Related Art Conventionally, in a blast furnace, pulverized coal is blown from a tuyere by a blowing lance for the purpose of reducing the coke ratio and stabilizing the blast furnace operation by lowering the heat flow ratio.

In modern society, a large amount of plastic (polymer resin material) is used, and a large amount of these wastes are generated, most of which are treated by incineration or landfill. However, there are problems that incineration has a high operating cost and that it remains semi-permanently without being decomposed even if it is landfilled. Therefore, in the blast furnace, a method of thermally decomposing waste plastic to gasify it and use it as reducing gas or combustion heat has been considered. In this case as well, it is considered to use a blowing lance as in the case of pulverized coal.

The installation of the pulverized coal blowing lance is shown in FIG.
(Described in FIG. 1 of Japanese Patent Laid-Open No. 4-268002). In FIG. 5, 1 is a blast furnace iron shell, 2 is a furnace refractory, 3 is an outer tuyere receiving material, 4 is a middle tuyere receiving material, and 6 is a tuyere. The blow pipe 5 connected to the tuyere has an insertion hole 8 into which the blow lance 7 is inserted. The blowing lance 7 is inserted into the insertion hole 8, the tip 7a thereof is projected into the gas flow path of the blow pipe 5, and is fixedly attached to the insertion hole 8. Since the tip 7a of the blow lance is exposed to the high temperature gas flow and receives radiant heat from the inside of the furnace,
As the pipe forming the lance, a pipe having a structure in which a heat-resistant steel pipe is used and cooled by cooling water is generally used.

[0005]

However, as described above, when the blow lance is worn, cracked, or melted, the blow lance is conventionally directly attached to the lance insertion hole of the blow pipe. As for the replacement during operation, there was a danger that hot toxic gas would blow out to the surroundings from the insertion hole from which the blowing lance was removed, so it was necessary to take a rest. Further, it is necessary to fix the lance to the blow pipe in an airtight manner against the high temperature gas.

[0006] It is an object of the present invention to provide a lance mounting device capable of safely and easily replacing the blowing lance and the like even during operation.

[0007]

SUMMARY OF THE INVENTION The present invention has the above-mentioned object to provide a gas in a furnace in which two shutoff valves are connected to each other with a seal gas blowing short pipe interposed between the rear end of a seal gas pipe through which a lance is inserted. A lance formed by connecting a shut-off means, and connecting a gas seal means for gas-sealing a gap between the outer circumference of the lance and the seal gas pipe to the rear end of the gas shut-off means is attached to a gas blowing pipe. Solved by the mounting device.

The mounting device can be used to mount a lance for blowing in fuel such as pulverized coal, waste plastics or heavy oil, or a sensor mounting lance for inserting a measuring device or monitoring means.

According to the lance mounting device of the present invention, the seal gas blowing short pipe for flowing the seal gas is provided in the gap between the outer periphery of the lance and the inner wall of the seal gas blowing pipe, and the seal gas blowing short pipe is provided. Since two shutoff valves are provided in between, and the gas sealing means is provided at the rear end of the shutoff valve, even during operation, through the gap between the outer periphery of the lance and the inner wall of the seal gas blowing pipe, from inside the furnace. The spouting gas can be shut off, and the lance can be replaced safely and easily. In particular, in the present invention, by adopting such a structure, in the case of an oxygen-enriched air blowing operation (applied at the time of blowing pulverized coal, waste plastic, etc.) that requires a high sealing property from the viewpoint of safety. It will be more effective.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a lance mounting device of the present invention. The lance mounting device (hereinafter, referred to as mounting device) 10 is configured as follows. A first cutoff valve (ball valve or the like) 12 is connected to a connection flange at the rear end of the seal gas pipe 11 by connecting one of the connection flanges with a seal packing. A seal gas blowing short pipe 13 is connected to the other connecting flange of the shutoff valve 12 at one end thereof via a seal packing, and a second shutoff valve (ball valve) 14 is connected to the other end of the connecting flange at the other end of the seal packing. Connected through. Second shutoff valve 14
The packing box 15a of the gas sealing means 15 is connected to the other connection flange of the above through a seal packing.
15b is a packing retainer, and 16 is a square packing.

FIG. 2 shows a state in which the mounting device 10 having the above structure is mounted on a blow pipe as a gas injection pipe of a blast furnace. In FIG. 2, 1 is a blast furnace iron skin, 3 is an outer tuyere receiving material, 4 is a middle tuyere receiving material, and 6 is a tuyere. The blow pipe 5 is connected to the rear end of the tuyere 6 and blows hot air of about 1200 ° C. to the tuyere 6. In this blow pipe 5,
2 having an insertion hole 8 that obliquely penetrates the gas flow path from the outside
Individual insertion portions 5a and 5b are formed. Note that the insertion portion may be a plurality of two or more. The seal gas pipe 11 of the attachment device 10 is inserted and fixed in the insertion hole 8. Although this drawing shows a state in which the mounting device 10 is mounted only in one of the insertion holes 8, two mounting devices 1 are provided depending on the purpose.
0 can be attached and used.

FIG. 3 shows a state in which a lance is attached to the attachment device 10 of the present invention. One insertion part 5a
A pulverized coal (PC) injection lance 20 is attached to the attachment device 10 of FIG. This blowing lance 20 is composed of a triple tube of heat-resistant steel pipe, and has a cooling water supply short pipe 2 at its rear end.
0a and the drainage short pipe 20b are formed. And
Pulverized coal (PC) and carrier gas flow in the inner pipe, and cooling water flowing outside the inner pipe cools the lance. Short tube 13 with seal gas injected during injection of pulverized coal, etc.
A seal gas such as nitrogen gas is blown into the gap between the outer periphery of the blow lance 20 and the seal gas pipe 11 from the blow port 13a of the blow gas and is discharged into the blow pipe. At this time, by setting the pressure of the seal gas higher than the pressure inside the furnace, it is possible to block the gas that flows back from the inside of the furnace through the gap between the outer periphery of the lance and the inner wall of the seal gas blowing pipe.

The mounting device 10 for the other insertion portion 5b
, A sensor mounting lance 21 for inserting a fiberscope for monitoring the combustion state of the above pulverized coal.
Is installed. Like the above-mentioned lance, this mounting lance 21 is also composed of a triple tube of heat-resistant steel pipe, and has a water supply short pipe 21a, a drainage short pipe 21b and a cooling air supply short pipe 21c formed at its rear end. There is. Then, a fiberscope is inserted into the inner tube, and the combustion state of the powder or granular material blown by the blowing lance 20 is monitored. At this time, cooling air is blown from the cooling air supply short pipe 21c into the inner pipe toward the tip of the mounting lance 21. The cooling water flowing outside the inner pipe cools the lance 21 and also cools the cooling air flowing in the inner pipe. Therefore, the fiberscope in the inner tube is cooled by the cooling water and the cooling air and protected from the hot gas.

FIG. 4 is a view of the pulverized coal (PC) blowing lance and the fiberscope mounting lance mounted on the lance mounting device of the present invention as seen from the rear of the blow pipe.

In the above example, the case where the pulverized coal (PC) injection lance and the fiberscope are attached is shown. However, the lance attachment device of the present invention has an injection lance for other fuel such as waste plastic or heavy oil, It can also be applied to the case where a measuring instrument mounting lance such as a temperature measuring means is mounted. In this case, as an embodiment, each lance may be used alone or various combinations of a plurality of lances may be used.

The blowing lance 20 and the sensor mounting lance 21 need to be replaced when an abnormality such as water leakage or wear of the inner pipe occurs during use. Replacement of the lance in such a case will be described below with reference to FIG. Since the blowing lance 20 and the sensor mounting lance 21 have the same method of replacement, only the blowing lance 20 will be described.

(1) First, the blowing of pulverized coal or the like is stopped, and the line pipe (not shown) connected to the rear end of the blowing lance is disconnected.

(2) After loosening the packing retainer 15b to the extent that gas does not flow out, the blowing lance 20 is retracted until its tip reaches the middle of the seal gas blowing short pipe 13.

(3) The first shutoff valve 12 is fully closed.

(4) Further, the blowing lance 20 is retracted until the tip of the blowing lance 20 reaches the packing box 15a behind the second shutoff valve 14.

(5) The second shutoff valve 14 is fully closed, and the blowing lance 20 is removed from the packing box 15a.

(6) Insert a spare blowing lance into the hole of the corner packing 16 of the packing box 15a to fully open the second shutoff valve 14.

(7) The spare blowing lance is inserted until its tip reaches the middle of the seal gas blowing short pipe 13.

(8) Fully open the first shutoff valve 12.

(9) The spare blowing lance is moved forward until its tip reaches the blowing position, and the packing presser 15b is pressed.
Tighten.

(10) A line pipe is connected to the rear end of the spare blowing lance to restart the blowing of pulverized coal.

The replacement of the lance in the above steps (1) to (10) can be performed during the operation of the blast furnace. Moreover,
During the time-consuming lance replacement setup, the first shut-off valve 1
2 and the second shutoff valve 14 can be performed in a fully closed state, in other words, in a state in which they are doubly sealed against the leakage of the gas in the furnace from the outside of the furnace, so that the replacement can be performed safely and easily. You can The position of the lance can be changed during the operation by separately providing a moving means for the lance.

Although the above embodiment describes the case where the mounting device 10 is mounted on the blow pipe of the blast furnace, it is not limited to the blast furnace and other metallurgical smelting furnaces (iron smelting converter, copper smelting furnace, iron) for the same purpose. It is within the technical scope of the present invention to attach the attachment device of the present invention to a tuyere of a smelting reduction furnace, etc., a combustion furnace, or a burner.

[0029]

According to the lance mounting device of the present invention, gas can be prevented from leaking from the insertion hole when the lance or the like is replaced,
The blow lance can be replaced safely and easily even during operation.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a lance mounting device of the present invention.

FIG. 2 is a vertical cross-sectional view of a state in which the lance mounting apparatus of the present invention is mounted on a blow pipe of a blast furnace as seen from above.

FIG. 3 is a vertical cross-sectional view of a state in which a blow lance and a sensor attachment lance are inserted and attached to a lance attachment device of the present invention attached to a blow pipe of a blast furnace, as seen from above.

FIG. 4 is a view of the blow lance and the sensor attachment lance inserted into and attached to the lance attachment device of the present invention attached to the blow pipe of the blast furnace, as viewed from the rear of the blow pipe.

FIG. 5 is a vertical cross-sectional view showing a state in which a pulverized coal blowing lance is attached to a blow pipe of a conventional blast furnace.

[Explanation of symbols]

 5 Blow pipe 6 Tuyere 8 Insertion hole 10 Lance mounting device 11 Seal gas pipe 12 First shutoff valve 13 Seal gas blowing short pipe 14 Second shutoff valve 15 Gas sealing means 15a Packing box 15b Packing retainer 16 Square packing 20 Blowing lance 21 Sensor mounting lance

Claims (3)

[Claims] 1. A furnace gas shut-off means having two shut-off valves connected to the rear end of a seal gas pipe through which a lance is inserted, and a short end pipe of the seal gas is connected to the rear end of the gas shut-off device. A lance mounting device in which a gas sealing means for sealing the gap between the outer periphery of the lance and the sealing gas pipe is connected to a gas blowing pipe. 2. A fuel injection lance is attached.
Attachment device for the described lance. 3. The lance mounting device according to claim 1, further comprising a sensor mounting lance in which a measuring instrument or a monitoring means is inserted.