JPH0363575A - Method and equipment for measuring blowout amount of gas in furnace - Google Patents

Abstract

PURPOSE:To stably operate a blast furnace by boring a measurement hole whose diameter is stepwise made smaller as this hole reaches the inside of the furnace to choking material and providing both a dynamic pressure gage and a thermometer and sealing the interval between the tip of a measuring device and the shrunk part of the outer diameter of the measurement hole and measuring the flow rate of gas in the furnace of the inside of the measuring device to calculate the blowout amount thereof. CONSTITUTION:Both a pitot pipe 12 for measuring the dynamic pressure of gas in a furnace and a thermocouple thermometer 13 for detecting the temp. of gas in the furnace are fixed to the side wall of a measurement cylinder 10. A sealing jig 11a is provided to one end of the measurement cylinder 10. A conduit 11b capable of being inserted into a measurement hole 9 is fitted thereto. When the blowout amount of gas flow B ejected to a tap hole 6 is measured, the conduit 11b fitted to the tip of the measurement cylinder 10 is inserted into the measurement hole 9a to seal the interval between the end part of this hole 9a and the sealing jig 11a. Thereby stable operation of a blast furnace is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for measuring the amount of in-furnace gas ejected from the furnace wall near the taphole of a blast furnace to the taphole.

[Prior Art and Problems to be Solved by the Invention] The blast furnace main body is most required to function as a container for carrying out stable reactions within the furnace. The temperature and pressure inside the furnace during the above reaction is high, and the gas generated inside the furnace contains Co gas, which is toxic and flammable, so it is important to seal the gas inside the furnace. It has become a challenge.

Conventionally, the furnace body has been constructed of various types of bricks having excellent fire resistance, and the outside of the bricks is further covered with stamping material and iron skin to prevent leakage of gas within the furnace. However, the tap hole for extracting the molten metal in the furnace body is, for example, provided by opening a cylindrical hole in the brick of the furnace wall, as will be described later, so that the structure makes it easy for gas to blow out from the furnace wall. It has become. FIG. 7 is a schematic sectional view of a tap hole provided in a furnace wall, and 1 in the figure represents a furnace wall made of different types of bricks. A taphole holder 4 in the shape of a bottomless truncated cone is provided at a predetermined position on the outside of the furnace wall l, and a stamp material 2 is provided on the outside of the furnace wall 1 except for the taphole holder 4. And an iron skin 3 is attached.

The taphole holder 4 is filled with pouring material (castable) 5, and a cylindrical taphole 6 is provided by drilling the pouring material 5 and the bricks of the furnace wall l following it. It is being

During tapping, the taphole 6 has a flow rate of gas passing through brick joints or boundaries between different types of bricks, as shown by the solid line in the figure, and a gas flow rate as shown by the broken line in the figure. , the gas flow rate flowing through the stamp material 2 and into the gap between the pouring material 5 and the bricks sometimes spouted out. Therefore, when the tap is not being tapped, the tap hole 6 is filled with a plugging material (mud material) 8 as shown in Fig. 7 to shut off the inside of the furnace 7 and the outside of the furnace to prevent leakage of the gas inside the furnace. When tapping iron, a hole is opened in the center of this plugging material 8 with a hole bit for tapping, thereby blocking the gas flow rate or the gas in the furnace ejected from the furnace wall 1, such as the gas flow rate, as described above. was.

However, even with the above method, if the gap between the poured material 5 and the brick is large, or if the blocking effect of the closing material 8 itself is weak, that is, if it is susceptible to erosion and abrasion by molten metal,
The blocking part of the plugging material is destroyed, the gas in the furnace is blown out, and hot metal is scattered during tapping. The main cover in front of the taphole is rapidly eroded by the gas flame, and furthermore, the gas flow causes negative effects such as a decrease in the amount of iron tapped, making stable operation of the blast furnace impossible.

Therefore, conventionally, when the gap between the poured material 5 and the brick is large, the gas in the furnace that blows out from the taphole after opening is combusted, and the amount of blowout is determined based on the length of the flame, and the gap between the pouring material 5 and the brick is large. The gas path was blocked by press-fitting material.

However, this method also has the problem that when the amount of gas ejected from the furnace increases, the gas ejection speed becomes faster than the combustion speed, and the flame disappears, making it impossible to even confirm.

The present invention has been made in view of such circumstances, and includes a measuring hole provided in a plugging material that closes the tap hole, a pitot tube and a thermometer arranged therein, and a conduit fitted into the measuring hole. It is an object of the present invention to provide a method and apparatus for measuring the amount of gas ejected in a furnace, which enables stable operation of a blast furnace by quantifying the amount of ejected gas in the furnace in the taphole by inserting a measuring device into the measurement hole. purpose.

[Means to solve the problem]

The method for measuring the amount of in-furnace gas ejected according to the present invention is the amount of ejected gas in the furnace that is ejected into the blast furnace taphole, which is closed with a plugging material during non-tapping, and the hole is opened by the plugging material during tapping. In the method for measuring the temperature, the method comprises: drilling a measurement hole in the plugging material that gradually becomes smaller in diameter toward the inside of the furnace, and arranging a dynamic pressure gauge and a thermometer to guide the gas inside the furnace. a step of inserting a measuring device comprising a measuring tube into the measuring hole and sealing between the tip of the measuring device and a portion where the outer diameter of the measuring hole is reduced; and introducing the measuring tube into the measuring device. The method is characterized by comprising a step of measuring the flow rate of the in-furnace gas and determining the ejection amount of the in-furnace gas based on the result.

Further, the in-furnace gas ejection amount measuring device of the present invention is a measuring device used in the in-furnace gas ejection amount measuring method according to claim 1, wherein one end fits into the portion where the outer diameter of the measurement hole is reduced. A measurement comprising a conduit, which is connected to the other end of the conduit, has a cylindrical shape to guide the furnace gas from the measurement hole, and is provided with a pitot tube and a thermometer for determining the flow rate of the furnace gas. It is characterized by having a tube.

[Effect]

When the space between the tip of the measuring device and the portion of the measurement hole where the outer diameter is reduced is sealed, the furnace gas ejected from the sealed portion into the measurement hole inside the furnace is guided to the measurement tube through the conduit. Then, the dynamic pressure of the guided furnace gas is measured by a pitot tube provided in the measurement tube, and the temperature of the furnace gas is measured by a thermometer provided in the measurement tube. Then, the specific gravity of the furnace gas in the ejected state is determined based on the measured temperature and the predetermined specific gravity of the furnace gas, and the specific gravity of the furnace gas is determined from the specific gravity and the detected dynamic pressure. The flow velocity within the furnace is calculated, and the ejection amount of the gas within the furnace is determined from the obtained flow velocity and the measured cylinder diameter. In the same way, a sealing part is further provided on the inside of the furnace of the measurement hole, and from this the amount of in-furnace gas ejected into the measurement hole inside the furnace is determined, and the difference between this and the in-furnace gas obtained earlier is calculated. By calculating , the amount of in-furnace gas ejected within the measurement hole between the previously sealed part and the currently sealed part can be determined.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The method for measuring taphole gas discharged from a taphole of the present invention (hereinafter referred to as the "method of the present invention") and its measuring device (hereinafter referred to as the "apparatus of the present invention") of the present invention will be specifically described in detail below with reference to drawings showing embodiments thereof.

1, 2 and 3 are schematic diagrams showing embodiments of the method of the present invention.
represents the hearth wall made of different types of bricks. A taphole holder 4 in the shape of a bottomless truncated cone is provided at a predetermined position on the outside of the furnace wall 1.
A stamp material 2 and an iron skin 3 are attached to the outside of the . The taphole holder 4 is filled with pouring material 5, and a cylindrical taphole 6 is provided by opening the pouring material 5 and the bricks of the furnace wall 1 following it. .

First, a drilling bit (not shown) is inserted into the tap hole 6 filled with the plugging material 8 during non-tapping, as shown in FIG.
A small-diameter cylindrical measurement hole 9b is drilled closer to the hole, and a larger-diameter measurement hole 9a is drilled in stages toward the end of the tap funnel 6.

On the other hand, FIG. 4 is a partially cutaway side view of the apparatus of the present invention used in the process of FIG. 2, and numeral 10 in the figure indicates a cylindrical measuring tube. A pitot tube 12 for measuring the dynamic pressure of the furnace gas and a thermocouple thermometer 13 for detecting the temperature of the furnace gas are fixed to the side wall of the measuring tube 10. Further, a protective tube 12a is provided around the pitot tube 12 to prevent damage.

An annular sealing jig 11a that is concentric with the measuring tube 10 and has a larger diameter than the measuring hole 9a is provided at one end of the measuring tube ■0, and is opposed to the measuring tube 10 of the sealing jig 11a. On the side, there is a cylindrical conduit 1 having a diameter that can be inserted into the measurement hole 9a.
1b is installed.

The length of this conduit 11b is not particularly limited as long as it can fit into the measurement hole 9a, and it is desirable that its diameter is close to the diameter of the measurement hole 9a so that it can be inserted into the measurement hole 9a.

Further, the pitot tube 12 has its tip disposed approximately at the center of the measurement tube 10 and is a pressure impulse tube (total pressure measurement It consists of a pressure guide tube (for measuring static pressure) that opens in the opposite direction, and a dynamic pressure needle that determines dynamic pressure from the pressure inside these pressure guide tubes.

The fixed position of the pitot tube 12 is preferably at least 10 times the diameter of the measuring tube 10 from the tip of the measuring tube 10.
It is preferable to attach by means such as welding to prevent the leakage of furnace gas from the installation part.

Further, the fixed position of the thermocouple thermometer 13 is the pitot tube 12.
It is desirable that the diameter of the thermocouple thermometer 13 be at least five times the diameter of the measuring tube 10 so as not to affect the measurement of the temperature.
It is desirable to install it so that it protrudes from the inner wall of the measuring tube 10 by 10 mm to about half the diameter of the measuring tube 10.

In the furnace wall 1 of a blast furnace as shown in Fig. 1, for example, as shown by the solid line in the figure, the gas flow A passes through the brick joints or the boundary between different types of bricks and is ejected to the taphole 6. The pouring material 5 flows along the stamp material 2 as shown by the broken line.
When measuring the amount of gas flow B ejected from the gap between the brick and the tap hole 6, as shown in FIG. conduit 1
1b is inserted into the measurement hole 9a, and the gap between the end of the measurement hole 9a and the sealing jig 11a is sealed. At this time, the measuring tube 10 is fixed with, for example, a wire, and the sealed portion is sealed with a sealing material 14.

As a result, the gas flow head and gas flow B ejected into the measurement holes 9a and 9b are guided into the measurement tube 10, and the total pressure and static pressure of these gases flowing into the pressure impulse pipe of the pitot tube 12 are reduced. is sent to a dynamic pressure gauge (not shown), and the dynamic pressure, which is the difference between the total pressure and the static pressure, is determined by the dynamic pressure gauge.

Further, the gas that has flowed into the pressure impulse tube of the pitot tube 12 is guided to a component analyzer (not shown), and CO in the gas is analyzed.

The specific gravity of the gas in the standard state is determined by measuring the component ratios of cot, uz, and O2, and calculating the remainder as Nt. At the same time, the thermocouple thermometer 13
The temperature of the gas flow head and the gas flow B guided into the measurement tube 10 is measured, and the specific gravity of the gas in the ejected state is determined based on the measured temperature.

Furthermore, the gas flow rate and the gas flow B in the measuring tube 10 are calculated from the specific gravity and the dynamic pressure, and from the calculation results and the outer diameter of the measuring tube 10, the gas flow rate and the gas flow B in the standard state are calculated. Find the amount of ejection.

FIG. 5 is a side view of the apparatus of the present invention used in the process shown in FIG. 3, and the measuring tube 10 has a structure similar to that shown in FIG. 4. A cylindrical conduit 11b concentric with the measurement tube 10 is provided at one end of the measurement tube 10.
is the length that can be fitted into the measurement hole 9b, for example, the length of about 20 to 30 mm added to the depth of the measurement hole 9a,
It can be inserted into the measurement hole 9b and has a diameter close to the diameter of the measurement hole 9b. Then, the measurement tube 1 of the conduit 11b
At a predetermined position on the side opposite to the 0 side, there is an annular sealing jig 11 that is concentric with the measurement tube 10 and has a larger diameter than the measurement hole 9b.
a is ringed.

Moreover, FIG. 6 is a side view showing the combination jig of the measuring tube 10, and the conduit 1 encircling the sealing jig 11a shown in FIG.
It has a structure in which a flange portion is provided on the periphery of the end of the measuring tube 10 side of the measuring tube 1b in place of the measuring tube lO. That is, instead of the sealing jig 11a and the conduit 11b housed in one end of the measuring tube 10 of the measuring device shown in FIG. By connecting the flange portion with bolts or bolts, the measuring device shown in FIG. 5 can be replaced.

Insert the measuring device in which the measuring tube 10 of FIG. 4 is combined with a combination jig or the conduit 11b of the measuring device in FIG. to seal between the portion where the outer diameter of the measurement hole 9a is reduced and the sealing jig 11b. Furthermore, at this time,
The sealed portion is sealed with a sealing material 14.

In this way, only the gas flow jetting out into the measurement hole 9b is guided from the conduit 11b to the measurement tube 10, and the gas flow B is transferred to the conduit 11.
It passes between the outside of the hole 9a and the measurement hole 9a, and escapes from the end of the tap hole 6 to the outside of the furnace, thereby preventing backflow into the measurement hole 9b. The gas flow led to the measuring tube IO flows into the pressure guiding pipe of the pitot tube 12, and the total pressure of the gas flow is reduced.

The static pressure is sent to a dynamic pressure gauge, which determines the dynamic pressure, which is the difference between the total pressure and the static pressure. In addition, the gas flowing into the pressure impulse pipe of the pitot tube 12 is guided to a component analyzer (not shown),
By measuring the component ratios of CO20□, 11□ and 0□ in the gas, and calculating the remainder as N2, the specific gravity of the gas flow person in the standard state is determined. At the same time, the temperature of the gas flow introduced into the measuring cylinder 10 is detected by the thermocouple thermometer 13, and based on the detected temperature, the specific gravity of the gas flow in the ejection state is determined. Furthermore, the flow rate of the gas flow in the measuring cylinder 10 is calculated from the specific gravity and the dynamic pressure, and from the calculation result and the outer diameter of the measuring cylinder 10, the amount of gas flow in the standard state is determined.

Next, by subtracting the ejection amount of the gas flow person from the ejection amount of the gas flow person and the gas flow B obtained as described above, the gas flow B is obtained.
The amount of ejection is calculated.

Therefore, the ejection state of the gas in the furnace can be grasped from the ejection amounts of gas amount A and gas amount B.

In addition, in this embodiment, the furnace gas spouted into the taphole 6 is divided into two types, that is, the furnace gas spouted into the taphole 6 is divided into two locations. Two measurement holes, measurement hole 9a and measurement hole 9b, were bored in the plugging material 5, but
Needless to say, if it is desired to investigate the location of the in-furnace gas ejection in detail, a large number of measurement holes may be bored in the plugging material 5 of the tap hole 6, the diameter of which gradually decreases toward the inside of the furnace.

Moreover, since the temperature of the ejected furnace gas is as high as 200 to 400° C., the material of the measuring tube 10 is preferably steel.

[Effects of the Invention] As described in detail above, in the present invention, a measurement hole whose diameter gradually becomes smaller toward the inside of the furnace is provided in the plugging material that closes the tap hole, and a pitot tube and a pitot tube are installed in the measurement hole. Inserting a conduit provided in a measuring device equipped with a thermometer, and sealing between the tip of the conduit and the portion where the outer diameter of the measurement hole is reduced,
This sealing part measures the amount of in-furnace gas ejected into the measurement hole on the inside of the furnace, so the state of the in-furnace gas ejected inside the taphole can be quantitatively determined, and the gas path in the furnace wall is blocked. When press-fitting, the press-fitting material can be pressed into the correct position. By measuring the amount of gas ejected in the furnace before and after the press-in material is inserted, it becomes possible to quantitatively understand the effect of the press-in material, and by conducting this regularly, it is possible to reduce the deterioration of the press-in material after the press-in. The present invention has excellent effects such as being able to accurately grasp the progress status.

[Brief explanation of drawings]

1, 2, and 3 are schematic diagrams showing embodiments of the method of the present invention, FIG. 4 is a partially cutaway side view of the apparatus of the present invention used in the process of FIG. 2, and FIG. FIG. 6 is a side view showing the assembly jig of the measuring tube 10, and FIG. 7 is a schematic cross-sectional view of the tap hole provided in the furnace wall. l...Furnace wall 6...Tapping port 8...Clugger 9
a, 9b...Measurement hole 10...Measurement cylinder 11
a... Sealing jig 11b... Conduit 12...
Pitot tube 13...Thermocouple thermometer A, B.
・Gas flow

Claims (1)

[Claims] 1. A method of measuring the amount of in-furnace gas ejected into the taphole of a blast furnace, which is closed with a plugging material during non-tapping and is opened by the plugging material during tapping. A step of drilling a measurement hole in the plugging material whose diameter gradually becomes smaller toward the inside of the furnace, and a measuring tube equipped with a dynamic pressure gauge and a thermometer for guiding the gas inside the furnace. a step of inserting a measuring device comprising the above-mentioned measurement device into the measuring hole and sealing between the tip of the measuring device and a portion where the outer diameter of the measuring hole is reduced; A method for measuring the amount of gas ejected in a furnace, comprising the steps of: measuring the flow rate of gas; and determining the amount of ejected gas in the furnace based on the result. 2. A measuring device used in the method for measuring the amount of gas ejected in a furnace according to claim 1, comprising: a conduit whose one end fits into the portion of the measurement hole where the outer diameter is reduced; and the other end of the conduit is connected to the conduit; A furnace having a cylindrical shape for guiding the furnace gas from the measurement hole, and comprising a pitot tube for determining the flow rate of the furnace gas and a measuring tube in which a thermometer is disposed. Internal gas ejection amount measuring device.