JPH07216423A - Detection of wear of burner for blowing pulverized coal into blast furnace - Google Patents

Abstract

PURPOSE:To surely detect whether the wear at the tip part of a pulverized-coal blowing burner reaches the limitation or not yet. CONSTITUTION:At the time of blowing the pulverized coal jetted from the burner 4 into a blast furnace together with blasting air flowing in a tuyere 1 while facing the tip part of the pulverized-coal blowing burner 4 to the inner part of the tuyere 1, an electric conductive wiring 5 coated with an insulating body is arranged along the longitudinal direction of the outer wall of the burner 4 so that this wiring tip part positions at the rear part by the set distance (a) from the tip part of the burner 4. Then the tip part of the burner 4 is worn by the set distance (a), the electric conductive wiring 5 is disconnected and, when the electric current is broken, an alarm for wear of the burner is transmitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can prevent accidents due to jetting and leakage of gas in a blast furnace by reliably detecting wear of a pulverized coal blowing burner due to combustion, melting, etc. The present invention relates to a method of wearing a pulverized coal blowing burner into a blast furnace.

[0002]

2. Description of the Related Art When blowing air through a tuyere to a blast furnace,
The technology for blowing pulverized coal has been implemented, but it is possible to use coal with low manufacturing cost and can be used for multiple purposes such as fine adjustment of hot metal components. It's getting more and more.

In the injection of pulverized coal into the blast furnace, the pulverized coal is fluidized by some method and is supplied to the pulverized coal injection burner through the pulverized coal transportation pipe using air or nitrogen as a carrier gas. The pulverized coal blown from the pulverized coal blowing burner is burned by being exposed to the high temperature air blow of about 1000 to 1300 ° C flowing in the tuyere. At this time, the tip of the burner is heated by the flame from the combustion and the heat from the high temperature gas in the furnace, so that the burner is worn by being oxidized or melted, and the length of the burner is gradually shortened.

If the pulverized coal injection burner is abruptly worn for some reason, the gas in the blast furnace may flow back to the burner side or gas may leak. If a gas leak occurs and an accident should occur, not only human injury such as burns due to hot air and poisoning due to CO gas will occur, but also a large reduction in production due to repairs and an increase in repair costs. In preparation for such a situation, conventionally, the wear state of the pulverized coal blowing burner is monitored by visually observing the length of the burner with the eyes of an operator through eyeglasses for tuyere. This is because there was no suitable measuring means or system for detecting burner wear.

In Japanese Patent Laid-Open No. 59-20410, the temperature of the pulverized coal conveying pipe is measured and monitored by a thermometer, and abnormal temperature rise of the pipe determines that the pulverized coal delivery pipe is damaged. A method is disclosed.

[0006]

In the prior art disclosed in the above publication, the blast furnace hot air flows backward from the tuyere to the transportation pipe side due to the damage of the transportation pipe carrying the pulverized coal to the pulverized coal blowing burner. A thermometer catches a sudden rise in the temperature of the transportation pipe, and this detects damage to the transportation pipe.

Since the present invention does not detect the damage of the pulverized coal transportation pipe but detects the wear of the tip portion of the pulverized coal blowing burner, it is difficult to apply the prior art of the above publication. Therefore, there has been no reliable means for detecting wear other than visually observing the burner from the tuyere glasses. The conventional visual observation has a problem that it is impossible to continuously monitor the burner length and it is impossible to cope with rapid burner wear.

An object of the present invention is to reliably detect that the tip portion of a pulverized coal blowing burner is worn and shortened, and that the length has reached a limit.

[0009]

Means for Solving the Problems The present invention for achieving the above object is directed to the tip end of a pulverized coal blowing burner facing the tuyere, and the pulverized coal ejected from this burner is blown together with the air flow flowing through the tuyere. When blowing into the blast furnace, the conductive wire wiring covered with an insulating material is arranged along the longitudinal direction of the outer wall of the burner so that the tip of the wire is located behind the tip of the burner by a set distance. A method for detecting wear of a pulverized coal blowing burner to a blast furnace, which is characterized in that a burner wear alarm is issued when the conductive wire wiring is broken and the current is cut off when the tip of the wire wiring is cut.

[0010]

According to the present invention, the conductive wire wiring covered with an insulating material is arranged along the outer wall longitudinal direction of the pulverized coal blowing burner so that its tip is located rearward from the burner tip by a set distance. , The tip of the burner is worn to the position of the set distance and the tip of the conductive wire wiring is broken. This makes it possible to continuously monitor the burner until it has worn to an acceptable limit. As a result, it is possible to prevent a disaster caused by the ejection of gas in the blast furnace due to burner wear.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. The tuyere structure part of the blast furnace is connected by fitting the cooling box 8 to the receiving object 9 fixed to the iron shell 11, further fitting the tuyere 1 to the cooling box 8 and pressing the blow pipe 2. The bend pipe 12 is connected to the rear end of the blow pipe 2. Reference numeral 10 indicates a blast furnace wall.

The pulverized coal blowing burner 4 (hereinafter referred to as burner) has its tip facing the inside of the tuyere 1.
Is attached via a flange 7 to a pipe seat 13 provided in the middle of the blow pipe 2. Further, the burner 4 has a flange 14
It is connected to the pulverized coal transportation pipe 3 via. The conductive wire wiring 5 covered with an insulator along the outer wall longitudinal direction of the burner 4,
The tip of the burner 4 is fixed and disposed so as to be located rearward from the tip of the burner 4 by a set distance a (see FIG. 2). It is desirable to set the set distance a on the safety side so that it is possible to prevent the tip of the burner 4 from being worn and shortened and causing gas in the furnace to flow back and cause trouble.

The conductive wire wirings 5 extending along the longitudinal direction of the burner 4 are fixed fittings (not shown) arranged at a predetermined pitch.
It is fixed using a fixing means such as
It is pulled out of the furnace from the portion of the flange 7 attached to 13 and is connected to the wear detector 6. Next, the operation of the present invention will be described. When pulverized coal is supplied from the pulverized coal transportation pipe 3 to the burner 4 by using air as a carrier gas, the pulverized coal passes through the burner 4 and then the hot air flowing through the tuyere 1 flows. It gushes inside and is blown into the furnace. In this way, when the blast furnace is operated while jetting the pulverized coal from the burner 4 into the hot air flowing through the tuyere 1, the tip of the burner 4 is melted by the combustion heat of the pulverized coal and the combustion heat of the coke in the furnace. It wears out due to factors such as, and gradually shortens. Sometimes, the tip of the burner 4 may be abruptly worn for some reason.

In the present invention, a current is made to flow from the wear detector 6 to the conductive wire wiring 5, and the wear detector 6 detects whether or not the current is flowing. During the blow to the blast furnace, the burner 4 is gradually worn and shortened due to the combustion heat of the pulverized coal and the combustion heat of the coke in the furnace. Whether the tip of the burner 4 is worn away and worn by a set distance a so that the tip of the burner 4 and the tip position of the conductive wire wiring 5 coincide with each other.
When trying to wear more, the tip of the conductive wire wiring 5 is broken. The wear detector 6 detects the interruption of the current due to the disconnection of the conductive wire wiring 5, and based on this, an alarm of burner wear is issued, whereby measures such as replacement of the burner 4 should be taken. become.

Thus, according to the present invention, since it is possible to continuously monitor the tip of the burner 4 so as not to wear it for a predetermined distance a or longer, gas leakage or the like due to excessive wear of the burner 4 may occur. Accidents can be prevented in advance.

[0016]

As described above, according to the present invention, it is always checked whether the burner length is worn to the allowable limit due to the disconnection of the conductive wire wiring arranged along the outer wall longitudinal direction of the pulverized coal blowing burner. Can be monitored. Therefore, it is possible to prevent the gas in the blast furnace from being jetted and leaked due to excessive wear of the burner.

[Brief description of drawings]

FIG. 1 is a sectional view showing an apparatus according to an embodiment of the present invention.

FIG. 2 is a partial plan view showing an arrow AA of FIG.

[Explanation of symbols]

 1 Tuyere 2 Blow Pipe 3 Pulverized Coal Transport Pipe 4 Pulverized Coal Injection Burner 5 Conductive Wire Wiring 6 Wear Detector 7 Flange 8 Cooling Box 9 Receiving 10 Blast Furnace Furnace Wall 11 Steel Skin 12 Bend Pipe 13 Pipe Seat 14 Flange

Claims (1)

[Claims] 1. When the tip end of a pulverized coal blowing burner faces the tuyere, and when the pulverized coal ejected from this burner is blown into the blast furnace together with the air flow flowing through the tuyere, it is along the longitudinal direction of the outer wall of the burner. The conductive wire wiring covered with an insulating material is arranged so that its tip is located a predetermined distance rearward from the burner tip, and the burner wear reaches the tip position of the conductive wire wiring to break the conductive wire wiring. The method for detecting the wear of the pulverized coal injection burner into the blast furnace is characterized in that a burner wear alarm is issued when the current is cut off.