JPS62149806A - Method for inserting blast furnace probe into blast furnace - Google Patents

Abstract

PURPOSE:To prevent the damage of the gland packing in a sealing box by providing an air cylinder between a furnace inside valve and sealing box and inserting a probe into the furnace after confirming the sealing between respective apparatus. CONSTITUTION:The air cylinder 7 is provided between the furnace inside valve 3 and the sealing box 5. The valve 3 is closed while the top end of the probe 6 is held inserted into the box 5. A vent valve 11 is closed and pressurizing valve 9 is opened. An operator monitors a pressure gage 12 and inserts the probe 6 into the furnace by opening the valve 3 if there is no pressure drop. The probe 6 with which the prescribed sampling and measuring is completed is retreated in a manner as not to contact the gland packing 16, the accident by the ejection of a blast furnace gas is prevented and the extremely safe measurement operation is carried out according to the above-mentioned probe insertion method.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for inserting a blast furnace sonde into a blast furnace for measuring the inside of the blast furnace and sampling the contents.

[Conventional + technique]

This is the insertion part of the conventional blast furnace sonde.

As shown in Fig. 2, a valve 3, a telescopic pipe 4, a seal box 5
When inserting the probe 6 into the furnace, first open the button 3 with the probe 6 inserted into the seal box 5. Therefore, if the sealing performance of the seal box is poor, the furnace gas with high CO concentration will blow out.
It is a danger.

Furthermore, when the sonde is inserted into the furnace and then taken out, dust and fused materials from inside the furnace may adhere to the surface of the sonde 6, especially when the sonde is inserted into the tuyere. Sonde 6 passes by. Therefore, the gland packing 16 of the seal box 5 is damaged, the sealing performance is deteriorated, and the gas inside the furnace is blown out, which is very dangerous.

[Problem that the invention seeks to solve]

This invention eliminates sealing defects in seal boxes! The second priority is to detect it before IS and to prevent damage to the gland packing inside the seal box due to dust, fused materials, etc. attached to the outer surface of the sonde in the furnace insertion part.

[Means for solving problems]

In order to check the sealing performance of the seal box 5 before 119, a hollow cylinder 7 is provided between the valve 3 and the seal box 5. The length of the hollow cylinder 7 is determined by adding some margin to the length of insertion into the furnace. Then, an inert gas supply pressurizing pipe 8 and an on/off valve pressurizing valve 9 are attached to the hollow cylinder 7 to pressurize the inside of the hollow cylinder above the furnace internal pressure. Furthermore, an exhaust pipe 10 for exhausting the gas, an exhaust valve 11, and a pressure gauge 12 for checking the pressure drop inside the cylinder are provided.

In FIG. 1, when inserting the sonde 6 into the furnace, first,
With the tip of the sonde 6 inserted into the seal box 5,
Close the furnace inner valve 3. In this case, the sonde tip position does not need to be at a specific position as long as it is between the furnace inner valve 3 and the seal box 5, but in consideration of stopping accuracy etc., it should not interfere with the furnace inner valve 3. , and set it in a position where it will not come off from the gland packing 16.

Next, after confirming that the exhaust valve 11 is closed, the pressurizing valve 9
Open. Monitor the indication of the pressure gauge 12, and set the internal pressure of the blast furnace + α (α should be 0 or more. In the example, 0.5
kg/cm'), turn off the pressurizing valve 9 and check whether the reading on the pressure gauge 12 does not drop.
hold for a certain amount of time. Although the length of this time is not specified, in the example, it is held for 2 to 5 minutes. If the pressure drops, it means that there is a seal failure in any of the equipment, including the main body of the sonde 6, between the furnace inner valve 3 and the seal box 5.

Therefore, it is necessary to inspect and repair it.

Next, if there is no pressure drop, the furnace inner valve 3 is opened and the probe 6 is inserted into the furnace.

After completing the prescribed sampling, measurement, etc., the sonde is retreated to between the furnace inner valve 3 and the seal box 5,
The sonde position at this time must be such that the gland packing 16 attached to the inner surface of the seal box 5 does not touch the part of the sonde 6 inserted into the furnace. This is because dust, raw material in the furnace, molten material, etc. may be attached to the surface of the part where the sonde 6 is inserted into the furnace, and these may damage the gland packing 6 and worsen the sealing performance of the gland packing. Because there is.

Next, the furnace inner valve 3 is closed, and the measurement work is completed.

As described above, before inserting the blast furnace sonde, check the sealing properties of each device before inserting it, and when retracting the sonde, the sonde is retracted without damaging the gland packing with deposits on the surface of the sonde.

This makes it possible to prevent a major accident in which a seal failure is inadvertently noticed and the furnace gas or furnace contents are blown out, and the desired measurement work can be accomplished.

〔Effect of the invention〕

It is possible to prevent major accidents caused by inadvertently blowing out high-temperature, high-pressure, and valuable blast furnace gas, and to achieve measurement work that puts safety first.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the sonde insertion method according to the present invention;
The figure is a side view of a conventional blast furnace sonde.

Claims (1)

[Scope of Claims] 1. At least one or more valves are provided on the outside of the sonde insertion holes provided in the walls of the blast furnaces, and a cavity necessary for the accuracy of stopping the sonde is provided between the valve and the seal box, When inserting the sonde into the furnace, close the valve with the tip of the sonde inserted into the seal box, pressurize the inside of the cylinder with inert gas, measure the pressure drop, and seal the valve and seal box. A method for inserting a blast furnace sonde into a blast furnace, the method comprising: inserting the sonde into the blast furnace after detecting the temperature.