JPH06213782A - Gas pressure measuring probe - Google Patents

Abstract

PURPOSE:To allow accurate measurement of gas pressure by making a gas introduction hole through the side wall of a pipe having closed tip part in the vicinity thereof and providing a spiral filter disposed at the introduction hole while touching the inner peripheral face of the pipe thereby blocking intrusion of slack coal into gas. CONSTITUTION:A spiral spring 4 is disposed at a gas introduction hole 3, made through the side wall of a pipe P having closed end, while touching the inner peripheral face of the pipe P tightly. In other words, the pipe P is constituted of a pipe body 1 and a gas intruducing part 2 having outer diameter smaller than that of the body 1 in order to reduce insersion loss at the time of measuring pressure. One or a plurality of gas introduction holes 3 are made through the side wall of the introducing part 2 in the vicinity of the end thereof. A coal blocking member, i.e., a spring 4, is loaded into the introducing part 2 while touching the inner face tightly at the position covering the introducing hole 3. Consequently, even if a coke is pressed into the hole 3, the spring 4 covers the hole 3 to block intrusion of coal positively. The body 1 has the starting end coupled through a pipe 6 with an external pressure gauge.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas pressure measuring probe for measuring the gas pressure of coke oven gas.

[0002]

2. Description of the Related Art In a coke oven, coal is carbonized from the furnace wall side of the carbonization chamber toward the center to form coke. The pressure inside the coke oven becomes maximum when the center part becomes coke. Therefore, measuring the pressure at this time is indispensable for coke oven operation. As an example of a conventional device for measuring the pressure in a high-temperature vessel, a device for sampling the blast furnace gas and measuring the temperature and the pressure at that time has been disclosed in Japanese Utility Model Publication 58-
It is shown in Japanese Patent No. 109047. As shown in FIG. 6, this blast furnace gas pressure measuring device is provided with a plurality of porous breathable solids 52 at the tip of a sampling tube 51 to eliminate intrusion of raw material in the furnace mixed with gas. There is.

[0003]

However, in the coke oven, as described above, the coal is carbonized from the furnace wall side of the carbonization chamber toward the center to form coke, and when the central part becomes coke, the pressure of this part is reduced. The measurement is advantageous in the operation of the coke oven.

However, since the coal used in the coke oven also contains powder coal, this pulverized coal easily enters the probe for measuring the gas pressure, and when it burns in the probe, accurate gas pressure measurement is possible. Can not.

On the other hand, when the above-mentioned conventional apparatus for measuring the gas pressure in the furnace is directly applied to the coke oven, the pulverized coal mixed with the gas is removed by the air permeable solid 52, so that the mechanism is complicated and the manufacturing is troublesome. In addition to the above problems, there is a problem in terms of maintenance, and it is difficult to insert the measuring device in the center of the carbonization chamber, and the breathable solid 52 may be damaged during insertion. Therefore, the above-mentioned furnace gas pressure measuring device cannot be directly applied to the gas pressure measuring device in the carbonization chamber.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been proposed in view of the above, and a gas introduction hole is formed in the side wall near the tip of a pipe whose tip is closed, and gas is introduced into the pipe. It is characterized in that a spiral filter is disposed so as to be located in the hole and in contact with the inner peripheral surface of the pipe.

Further, in order to firmly fix the spiral filter inside the pipe, the diameter of the circumference of the lower part is larger than that of the upper part.

Further, in order to facilitate insertion of the probe into the carbonization chamber, the outer diameter of the pipe tip portion is smaller than that of the body portion.

[0009]

[Function] When the probe is inserted into the coal inside the carbonization chamber,
The generated gas is introduced into the probe through the gas introduction hole. At this time, the gas introduced into the probe rises through the space between springs as a spiral filter. On this occasion,
Pulverized coal is mixed together with the gas from the gas introduction hole, but since the gap between the springs is narrow, the invasion of powder coal is prevented. Therefore, since only the generated gas reaches the pressure gauge provided at the upper part through the communication pipe, the gas pressure can be accurately measured. Although the probe is inserted into the high temperature carbonization chamber, since the coal blocking member is formed of a spiral spring, it is possible to increase the strength corresponding to the pressure from the lateral direction and absorb the thermal expansion.

Further, since the coal blocking member is composed of a spiral spring having a larger circumference on one side than the other, the coal blocking member inserted into the pipe is repulsive in the radial direction of the spiral spring. It is firmly fixed to the inner surface.

Further, since the outer diameter of the tip of the pipe is made smaller than that of the body, resistance when inserting the probe into the carbonization chamber is reduced, and the probe can be smoothly inserted.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a gas pressure measuring probe. This gas pressure measuring probe has a gas introduction hole 3 formed in the side wall near the tip of the pipe P with the tip closed, and the inside of the pipe P is located inside the pipe P so as to be located in the gas introduction hole 3. A coal intrusion prevention member including a spiral spring 4 that is in close contact with the peripheral surface is provided.

More specifically, the pipe P is composed of a pipe body 1 and a gas introducing portion 2. In this embodiment, a hollow carbon steel pipe for pipes is used in each case.
Is made of 10ASGP having an outer diameter of 17.3 mm, and the gas introducing portion 2 is made of 6ASGP having an outer diameter of 10.5 mm, and has a pipe shape with a thin tip portion. This makes it possible to make the outer diameter of the gas introduction portion 2 smaller than that of the pipe body 1 and further reduce the insertion resistance when measuring the gas pressure.

The gas introduction part 2 has its tip closed by an appropriate means, and one or more gas introduction holes 3 are formed in the side wall near the tip.
Has a hole. The smaller the size of the gas introduction hole 3 is, the more the measurement accuracy is improved. However, the size of the gas introduction hole 3 is more likely to be clogged with pulverized coal, and one gas diameter of 3 to 5 mm is formed.

A spiral spring 4, which is a coal blocking member, is mounted inside the gas introducing portion 2 so as to be in close contact with the inner surface of the gas introducing portion 2 at a position at least covering the gas introducing hole 3. That is, the spiral spring 4 is formed with an outer diameter that is slightly larger than the inner diameter of the gas introducing portion 2, and after being attached to the gas introducing portion 2, the repulsive force causes the spiral spring 4 to adhere to the inner surface of the gas introducing portion 2. Therefore, even if the coke presses against the gas introduction hole 3, the spiral spring 4 covers the gas introduction hole 3 and reliably maintains the state of preventing coal from entering.

The gap between the spiral springs is about 0.2 to 0.3 mm. The distance between these gaps is generally 0.3 m
This is because m or more, and on the other hand, if the gap interval is set to be extremely narrow, the inflow amount of gas will be too limited. Therefore, it is possible to use the spiral springs 4 having different intervals depending on the size of the raw coal. Although the spiral spring 4 is made of stainless steel in this embodiment, it is needless to say that the spiral spring 4 is not particularly made of stainless steel as long as the metal has elasticity at high temperature.

As shown in the drawing, the pipe body 1 is connected to a pressure gauge 5 provided outside the coke oven 10 via a connecting pipe 6 so that the gas pressure introduced from the gas introduction hole 3 can be measured. There is.

Then, when the insertion of the raw coal into the carbonization chamber 7 is completed, the gas introduction hole 3 is directed from the upper center of the carbonization chamber 7 toward the longitudinal direction of the carbonization chamber 7 with the gas introduction portion 2 as the tip. Insert into the carbonization chamber 7. The gas generated in the central portion of the carbonization chamber 7 is introduced into the gas introduction portion 21 through the gap of the spiral spring 4 by the gas introduction hole 3 and is sent to the pressure gauge 5 through the pipe body 1 and the connecting pipe 6. The gas pressure is measured. At this time, the pulverized coal mixed with the gas is prevented from entering the gap of the spiral spring 4 having a narrow gap.

FIG. 3 shows another embodiment of the coal blocking member. When the spiral spring 4 is not formed to have an outer diameter slightly larger than the inner diameter of the gas introducing portion 2, the spiral spring 4 has a larger diameter. The diameter of the circumference is gradually increased downward, and the maximum diameter of the spiral spring 4 is slightly larger than the diameter of the inner circumference of the gas introduction portion 2. Therefore, when the spiral spring 4 is inserted into the gas introducing portion 2, the coal blocking member can be firmly fixed in the gas introducing portion 2 by the repulsive force of the spiral spring 4 trying to spread. The insertion work of the spiral spring 4 at the time of the insertion work of the spiral spring 4 into the gas introduction part 2 is easy. In this embodiment, since the problem is to firmly fix the coal blocking member in the gas introducing portion 2, the spiral spring 4 is
Only a part of the spiral portion may have a large diameter without gradually increasing the circumferential diameter of.

In the above embodiment, the pipe body 1
Although the gas introduction part 2 and the gas introduction part 2 have different thicknesses, the pipe body 1 and the gas introduction part 2 may have the same thickness.
However, in this case, the insertion resistance into the coke oven increases slightly. Further, the pipe body 1 and the gas introduction part 2 are connected by an appropriate means such as welding, but this is because of a work requirement for securely fixing the spiral spring 4 to the gas introduction part 2 at the position of the gas introduction hole 3. is there. Therefore, the pipe body 1 and the gas introduction portion 2 may be integrally formed, and after the spiral spring 4 is inserted at a predetermined position, the pipe tip may be closed by an appropriate means.

[0021]

As described above, according to the present invention, since the gas pressure measuring probe is provided with the coal intrusion preventing member formed of the spiral spring, the intrusion of the pulverized coal in the gas can be prevented with a simple structure. As a result, the gas pressure can be accurately measured, and the pulverized coal invasion preventing member can be attached easily and in a short time, which is an excellent effect not seen in the past. Further, since the coal blocking member is composed of a spiral spring having a lower circumferential diameter larger than that of the upper portion, the coal blocking member inserted into the pipe can be firmly fixed to the inner surface of the pipe.

Further, since the outer diameter of the tip of the pipe is made smaller than that of the body, resistance when inserting the probe into the carbonization chamber is reduced and the probe can be smoothly inserted.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the configuration of a gas pressure measuring probe of the present invention.

FIG. 2 is a perspective view showing a coal intrusion prevention member in the gas pressure measurement probe of the present invention.

FIG. 3 is a perspective view showing another embodiment of the coal intrusion prevention member.

FIG. 4 is a schematic configuration diagram of a gas pressure measuring device for measuring gas pressure using the probe of the present invention.

FIG. 5 is a cross-sectional view showing a conventional blast furnace gas pressure measuring device.

[Explanation of symbols]

 1 Pipe Body 2 Gas Inlet 3 Gas Inlet 4 Spiral Spring 5 Pressure Gauge 6 Connecting Pipe 7 Carbonization Chamber 10 Coke Oven P Pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Kudo 1 Nishinosu, Oita City, Oita Prefecture Nippon Steel Co., Ltd. Oita Steel Works Ltd.

Claims (3)

[Claims] 1. A spiral-shaped filter having a gas inlet hole formed in a side wall near the tip portion of a pipe having a closed end portion, the spiral filter being close to the inner peripheral surface of the pipe so as to be located in the gas inlet hole. A probe for measuring gas pressure, wherein the probe is provided. 2. The probe for gas pressure measurement according to claim 1, wherein the spiral filter has a larger circumferential diameter at the lower portion than that at the upper portion. 3. The gas pressure measuring probe according to claim 1 or 2, wherein the outer diameter of the pipe tip portion is smaller than that of the body portion.