JPH0625374B2 - Blast furnace gas sampling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an apparatus for performing gas sampling by a probe protruding in a radial direction in a blast furnace.

(B) Prior Art As shown in FIG. 1, in a fixed blast furnace gas sampling device 1 for performing gas sampling in the blast furnace radial direction, a probe 2 protruding from a blast furnace shell 11 into the furnace is used. Various troubles occur in the range from the sampling gas suction port 3 to the end 21 of the probe 2 outside the blast furnace iron shell 11.

In the conventional fixed type blast furnace gas sampling apparatus, the gas flow path portion from the gas suction port 3 to the gas conduit 4 to the outside of the furnace is only the bend pipe 5 (see FIG. 5). When high-temperature, high-concentration dust-containing gas is sucked in, the bend pipe 5 is worn by dust and the water cooling the probe 2 is worn in about 4 months by sampling once a minute, and the water is cooled through the hole. It was not possible to obtain accurate information to grasp the reactor conditions.

Further, since the bend pipe 5 is directly welded to the probe casing 12 (see FIG. 5), repair is difficult. Therefore, the side surface of the casing 12 is largely opened,
The repair method was to replace the worn bend pipe 5 inside from the opening. Further, many crack damages were generated in the welded portion between the bend pipe 5 and the probe casing 12.

Regarding the thermocouple 6 for temperature measurement (Fig. 5), there is no guide for positioning the tip of the thermocouple at the center of the gas suction port 3.
Therefore, the cold bend pipe 5 and the probe casing 12 come into contact with each other, and erroneous information that a temperature lower than the gas temperature is measured is generated, which deteriorates the operation.

(C) Problem to be Solved by the Invention The problem to be solved by the present invention is to accurately and reliably perform gas sampling and temperature measurement in a blast furnace gas sampling device, and to facilitate the repair of the device. Especially.

(D) Means for Solving the Problem A blast furnace gas sampling apparatus according to the present invention is a fixed blast furnace gas sampling apparatus that performs gas sampling in the blast furnace radial direction. The probe protruding in the radial direction is composed of an inner bend pipe, a gas conduit, an outer bend pipe, a sheath pipe, and a casing, and an outer metal member is welded and fixed to a gas suction port of the casing. Removably attach the inner hardware,
One end of the outer bend pipe is welded and fixed to the outer metal member from the inside of the casing, the inner bend pipe is inserted into the outer bend pipe, and one end of the inner bend pipe is supported by the inner metal member. The other end is connected to one end of the sheath pipe, the other end of the sheath pipe is guided to the outside of the casing, the expansion pipe is laid and supported by the casing, and the gas pipe is inserted into the sheath pipe and one end thereof is inserted. Is extended to the vicinity of the other end in the inner bend and the other end is fixed to the other end of the sheath pipe, and is introduced from the outside of the casing by the inner metal piece and penetrates the inside of each of the gas conduit and the inner bend pipe. The above problem is solved by means for guiding and positioning the thermocouple for temperature measurement.

(E) Embodiment An embodiment of the blast furnace gas sampling apparatus 1 of the present invention will be described with reference to FIGS. 1 to 4. The apparatus of the present invention extends the probe 2 in the radial direction of the blast furnace. The probe 2 is composed of an inner bend pipe 7, an outer bend pipe 8, a sheath pipe 9, and a casing 12. The outer metal piece 81 is welded and fixed to the gas suction port 3 of the casing 12, and the inner metal piece 71 is detachably attached to the outer metal piece 81.
Attach. One end of the outer bend pipe 8 is welded and fixed to the outer metal piece 81. The inner bend pipe 7 is inserted into the outer bend pipe 8, and one end of the inner bend pipe is supported by the inner metal piece 71. The other end of the outer bend pipe 8 is connected to one end of the sheath pipe 9. The other end of the sheath tube 9 is guided to the outside of the casing 12, and the expansion tube 13 is covered to be supported by the casing 12.
The gas conduit 4 is inserted into the sheath tube 9, one end of the gas conduit 4 is extended to near the other end of the inner bend tube 7, and the other end is extended to the sheath tube 9
The other end of the gas conduit 4 projects from the other end of the seal tube 9. The inner metal piece 71 guides and positions the thermocouple 6 for temperature measurement, which is guided through the gas conduit 4 and the inner bend pipe 7. A part of the gas derived from the gas conduit 4 is sent to the measuring device 15. The detection signal from the thermocouple 6 is also sent to the measuring device 15.

Next, the operation of the device of the present invention will be described.

From the gas suction port 3 to the gas conduit 4 to the outside of the furnace, as a measure against wear of the gas flow path, inside the outer bend pipe 8 in contact with the probe cooling water, a wear-resistant inner bend pipe or Then, insert a bend pipe 7 made of ordinary steel into a double pipe. As a result, even if the inner bend pipe 7 is punctured due to wear, there is no risk of water leakage into the furnace.

Further, the inner bend pipe 7 is only supported by the inner metal piece 71. If the inner metal piece 71 is removed, the inner bend pipe 7 can also be removed. Therefore, if the wear amount is predicted in advance and only the inner bend pipe 7 is regularly replaced, the wear portion, which has been a problem in the past, can be completely repaired.

The structure of the inner metal 7 is, as shown in FIGS. 3 and 4,
The gas flow path 711, the thermocouple support portion 712, and the inner hardware fixing portion 713 are configured. The overall shape is a cylinder with a flange.

The thermocouple support portion 712 is supported by the support rib 714. The thermocouple 6 is inserted into the support portion 712 and is supported so that the position of the thermocouple 6 does not change with respect to vibration and the like. The gas flow path 711 is divided into four by the support rib 714 of the thermocouple support portion 712.

The flange 715 of the inner metal fixture 713 rides on the inner half-moon protrusion 811 of the outer metal 81. Flange 81
A semicircular groove having an appropriate depth is provided on the back surface of No. 5, and the projection 811 is fixed by engaging with the groove. Therefore,
The mounting method of the inner hardware 71 is as shown in FIG.
Insert the position A of No. 1 to the position of 90 ° or 270 ° of the metal 81. The fitting is completed by turning the inner metal piece 71 in the range of 0 to 180 ° so as to align with the half-moon shaped inner protrusion portion 811 of the metal piece 81. In this way, the rotation of the inner metal piece 71 is fixed in a step shape, and due to rotation deviation due to vibration,
The inner metal piece 71 is prevented from coming off the protruding portion 811 and dropping into the furnace.

Further, the support portion of the inner bend pipe 7 is provided with a counterbore larger than the outer diameter of the inner bend pipe 7 to prevent center deviation between the outer bend pipe 8 and the inner metal piece 71. The inner bend pipe 7 only rides on the spot facing of the inner metal piece 71. In the replacement work at the time of wear, the above-mentioned inner hardware 7
1 is removed, the inner bend pipe 7 is pulled out, a new bend pipe is inserted, and the inner metal piece 71 is attached.

The probe casing 12 and the outer bend pipe 8 are fixed by welding by inserting the outer bend pipe 8 inside the metal 81.

As shown in FIG. 2, the end portion 21 of the probe 2 located outside the furnace has a difference in thermal expansion between the sheath tube 9 connected to the outer bend tube 8 at the gas suction port 3 and the probe casing 12. It is absorbed by the expansion tube 13. As a result, the thermal stress generated in the welded portion between the outer bend pipe 8 and the metal 81 in the vicinity of the gas suction port 3 is reduced, and cracks that have been conventionally generated are prevented.

Total length of probe 85m, measurement points 6 places, internal pressure of 1.9kg / c
As a result of using at m ² and temperature of 900 to 600 ° C., no failure occurred for 6 months.

(F) Effect According to the present invention, repair is only required to replace the internal bend pipe, which makes it very easy. In addition, the thermocouple position does not deviate from the center of the measurement port, and the gas temperature can be accurately measured. That can be detected in. Furthermore, effects such as eliminating the cause of cracks, being able to reliably perform in-furnace gas sampling, and enabling stable blast furnace operation are obtained.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a gas sampling device in a blast furnace to which the present invention is applied. FIG. 2 is a vertical cross-sectional view near the gas suction port and near the probe end. FIG. 3 is a partial vertical sectional view of the gas suction port. FIG. 4 is a bottom view taken along the line IV-IV in FIG.
FIG. 5 is a partial vertical cross-sectional view in the vicinity of the conventional gas suction port. 1: Gas sampling device in blast furnace 2: Probe, 3: Gas suction port 4: Gas conduit, 6: Thermocouple 7: Inner bend tube, 8: Outer bend tube 9: Sheath tube, 11: Blast furnace iron shell 12: Probe・ Casing 13: Telescopic tube, 71: Inner metal fittings 81: Outer metal fittings

Claims (1)

[Claims] 1. A fixed blast furnace gas sampling device for performing gas sampling in the blast furnace radial direction, wherein a probe projecting from the blast furnace shell in the furnace radial direction is provided with an inner bend pipe and a gas conduit. An outer bend pipe, a sheath pipe, and a casing. An outer metal member is welded and fixed to a gas suction port of the casing, an inner metal member is detachably attached to the outer metal member, and the outer metal member is attached to the outer metal member from inside the casing. One end of the outer bend pipe is fixed by welding, the bend pipe is inserted into the outer bend pipe, and one end of the inner bend pipe is supported by the inner metal member, and the other end of the outer bend pipe is connected to one end of the sheath pipe. , The other end of the sheath tube is guided to the outside of the casing, and the expansion tube is supported by the casing, and a gas conduit is inserted into the sheath tube, and one end of the sheath tube is inserted into the inner pipe. For temperature measurement, which extends to the vicinity of the other end of the pipe, and has the other end fixed to the other end of the sequence pipe and which is introduced from the outside of the casing by the inner metal piece and penetrates each of the gas conduit and the inner bend pipe. Blast furnace gas sampling device characterized by guiding and positioning the thermocouple.