KR101568604B1 - Apparatus for measuring of temperature of furnace - Google Patents

Abstract

The present invention provides an apparatus to measure an internal temperature of a furnace. According to an embodiment of the present invention, the apparatus to measure the internal temperature of the furnace comprises: a probe main body inserted into a fireplace of a furnace, having a measuring hole formed in a longitudinal direction, and opened to the outside; a protection pipe having ends arranged on each different position of the interior of the probe body in the longitudinal direction of the probe body; a temperature measuring means installed in the probe body to measure an internal temperature of the furnace; and a fuzzy means installed in the probe body to be connected to a temperature measuring means supplying fluid. The apparatus to measure the internal temperature of the furnace further comprises: a T-shape pipe installed in a rear end of the protection pipe; a ball valve connected to the rear end of the T-shaped pipe; a cooling induction pipe connected to the ball valve; and a sealing member connected to the cooling induction pipe.

Description

[0001] APPARATUS FOR MEASURING OF TEMPERATURE OF FURNACE [0002]

The present invention relates to a furnace internal temperature measuring apparatus, and more particularly, to a furnace internal temperature measuring apparatus for measuring a temperature of a furnace gas passing through a furnace and passing through a furnace.

The temperature distribution, the distribution of the charge and the distribution of the gas flow inside the blast furnace are very important in blast furnace operation management in the process of producing molten iron.

However, as shown in FIG. 1, the furnace 1 is difficult to continuously measure the temperature because it is reduced and melted after the iron ores are reduced, softened and iron ores and coke are dropped in the upper part, .

The temperature of the gas is measured at the upper part of the blast furnace along the gas moving direction 3 injected from the tuyere (not shown) of the blast furnace 1 and rising above the blast furnace 1, And a measurement device 6 is installed and managed.

However, as the blast furnace becomes larger and the diameter of the blast furnace becomes larger, the distribution of the charge and the distribution of the gas flow are unbalanced in the radial direction, and the furnace is unstable, resulting in a trouble in operation.

Further, the portion of the temperature measuring device 6 located at the front end, that is, the center of the blast furnace, is highly likely to be damaged by the impact load caused by falling of the charge charged in the upper portion. In addition, since it is very susceptible to thermal deformation by hot gas reaching 800 DEG C or higher, the conventional temperature measuring device 6 is difficult to use for a long period of time and frequent replacement is indispensable.

2, a conventional temperature measuring device 6 will be described in detail. The temperature measuring device 6 includes a body 11a fixed by a flange 11, a plurality of thermocouples 14 therein, a nitrogen gas- (12) and a nitrogen gas discharge pipe (13). And, the gas inlet pipe 15 is built in together so that the thermocouple 14 can measure the temperature of the gas.

However, there is a case where foreign substances such as the dust 5 charged together with the blast furnace are adhered to the gas inlet pipe 15 and the passage connected with the thermocouple 14 is blocked and heat transfer can not be performed smoothly, Many occur.

In addition, since the small diameter of the plurality of thermocouples 14 to be embedded is the same size as the center portion and the side wall portion of 0.5 mm, the thermocouples 14 are easily exposed to the hot gas for a long time.

Therefore, though the nitrogen gas is used to cool the thermocouple 14, the cooling effect is weak and the thermocouple 14 is hardly used in the production.

Korean Patent Publication No. 2011-0091356 (Published on Aug. 11, 2011)

It is an object of the present invention to provide a temperature measuring apparatus which accurately measures the temperature of a gas generated in a blast furnace and can use the blast furnace for a long time without frequent replacement.

The object of the present invention is to make it possible to grasp the temperature distribution of the gas in the inner diameter direction of the blast furnace through the temperature measurement of the blast furnace gas.

In addition, the object of the present invention is to improve the durability of the temperature measuring apparatus and to provide a necessary part in a replaceable structure when partial damage occurs.

Another object of the present invention is to improve the cooling efficiency of the temperature measuring apparatus.

The aim is to contribute to the productivity and process efficiency of smooth operation of the blast furnace.

The apparatus for measuring internal temperature of a blast furnace according to an embodiment of the present invention includes a probe body inserted into a glow plug and having a measurement hole longitudinally opened to communicate with the outside, A temperature measuring unit installed in the probe body and measuring a temperature inside the blast furnace; And a purge unit installed on the probe body to be connected to the temperature measuring unit to supply a fluid, wherein the T-shaped pipe is installed at a rear end of the protective pipe, and a ball connected to a rear end of the T- A cooling induction pipe connected to the ball valve; And a sealing member connected to the cooling induction pipe.

Preferably, the probe body is provided with a plurality of measurement holes spaced apart from each other by a predetermined distance, and has a plurality of inflow passages connecting the measurement hole and the temperature measurement means, wherein the measurement hole, The inflow passages correspond one-to-one, and the inflow passages can be arranged on the same line as the measurement holes.

More preferably, the temperature measuring means includes: a thermocouple installed inside the protective tube; And a vent hole provided at one side of the probe body.

Preferably, the purge means comprises: a fluid tank for storing a fluid; a plurality of supply lines for supplying a fluid by connecting the fluid tank and a protective pipe provided on the temperature measurement means one-to-one; And a plurality of supply valves provided in each of the supply lines and opened by a control means when the pressure inside the fluid tank reaches a certain level, wherein only one of the supply valves is opened, The fluid inside the probe can be supplied at a time through a supply line connected to one open supply valve to remove foreign matter from the probe body and cool the temperature measuring means.

Also, preferably, the protective tube and the probe body may be provided in a prefabricated state separated in the longitudinal direction.

Preferably, the probe body further includes a heat-resistant cover coupled to the outside and having a position corresponding to the measurement hole penetrated therethrough.

delete

According to a preferred embodiment of the present invention, the temperature of the gas generated in the blast furnace can be measured along the diameter of the blast furnace, so that the temperature distribution of the gas along the blast furnace diameter direction can be grasped. Therefore, the effect of efficient temperature control inside the blast furnace is created.

And, due to the thermal deformation and shock resistant temperature measuring device, it is possible to smoothly operate the blast furnace without frequent replacement, thereby improving the productivity.

In addition, high-pressure fluid is used to effectively remove foreign matter inside the probe body and smooth fluid flow inside the probe body. Therefore, the temperature inside the probe body can be prevented from rising and the thermocouple can be cooled.

In addition, by proposing a structure for selectively replacing only a portion where breakage or damage is severe, the time required for the replacement work can be reduced, and the efficiency of the work can be improved.

In addition, since the durable temperature measuring device can be used for at least 180 days, it is possible to reduce the cost and manpower consumed in the replacement, thereby contributing to the reduction of the manufacturing cost.

Fig. 1 schematically shows a conventional blast furnace temperature measurement operation.
2 is a perspective view of a conventional blast furnace temperature measuring device.
3 is a partial cross-sectional view of an apparatus for measuring internal temperature of a blast furnace according to a preferred embodiment of the present invention.
4 is an enlarged sectional view of the 'H' region of FIG.
FIG. 5 is an enlarged view of a front end portion of the apparatus for measuring internal temperature of a blast furnace according to a preferred embodiment of the present invention.
6 schematically shows a thermocouple according to a preferred embodiment of the present invention.
7 is a conceptual diagram illustrating the operation of the apparatus for measuring internal temperature of a blast furnace according to an embodiment of the present invention.
FIG. 8 schematically shows the configuration of the purge means of the apparatus for measuring internal temperature of a blast furnace according to a preferred embodiment of the present invention.
9 is a schematic view of a configuration of a thermocouple separating means of an apparatus for measuring internal temperature of a blast furnace according to a preferred embodiment of the present invention.
FIG. 10 is a schematic view of a prefabricated structure of a probe body and a protective tube according to a preferred embodiment of the present invention.
11 is an enlarged cross-sectional view showing another embodiment of the present invention with reference to the 'I' region of FIG.

In order to facilitate an understanding of the description of the embodiments of the present invention, elements denoted by the same reference numerals in the accompanying drawings are the same element, and among the constituent elements that perform the same function in each embodiment, Respectively.

Further, in order to clarify the gist of the present invention, a description of elements and techniques well known in the prior art will be omitted, and the present invention will be described in detail with reference to the accompanying drawings.

It is to be understood, however, that the spirit and scope of the present invention are not limited to the embodiments shown, but may be suggested by those skilled in the art in other forms, additions, or alternatives, .

3, the apparatus for measuring internal temperature of a blast furnace according to an exemplary embodiment of the present invention includes a rectangular probe body 20 fixed to a flange 11 and a plurality of protective pipes 41 inside the probe body 20. [ It is built in. The protection tube can be protected by the refractory material within the probe body 20.

In the present invention, six protection tubes 41 are provided as one embodiment. However, the protection tubes 41 may have appropriate numbers depending on the blast furnace situation, but the present invention is not limited thereto.

The protective tubes 41 may be provided in different lengths and may be arranged at different positions in the longitudinal direction of the probe body 20. This is done so that the temperature distribution in the radial direction inside the blast furnace can be grasped by measuring the temperature at different points in the radial direction of the blast furnace.

A plurality of measurement holes 21 are provided in the probe body 20 to measure the gas temperature inside the blast furnace. This is the same as the number of protective tubes contained in the probe body, and the ends of one protective tube are arranged to correspond to one measurement hole 21.

The gas flowing through the measurement hole 21 reaches the protective pipe 41 along the inflow passage 22 connecting from the measurement hole 21 to the protective pipe 41. Therefore, preferably, the measurement holes and the inflow passages also correspond one-to-one, and when the end portions of the protective pipe 41 are connected so that the measurement holes and the inflow passages are arranged on the same line, the gas introduced from the measurement holes 21 It is possible to efficiently reach the thermocouple 42. Then, the thermocouple 42 built in the protective tube can measure the temperature of the gas that has arrived.

At this time, the thermocouple (42) provided has the largest diameter of the thermocouple located at the center of the blast furnace with the highest temperature in the blast furnace, thereby reducing the risk of disconnection, and the thermocouple (42) disposed at the rear end, The diameter of the wire diameter may be smaller than this.

Therefore, in the present invention, the diameter of the small diameter thermocouple 42 disposed in the region A in FIG. 3 is the largest, and the diameter is gradually smaller toward the flange 11, In temperature measurement.

In addition, a vent hole 43 is provided on the flange 11 side of the probe body 20 to prevent the damage of the thermocouple due to an increase in gas pressure inside the probe body 20 by inducing gas discharge. The bending prevention member 44 may be provided at the lower portion of the probe body 20 so as to prevent the probe body 20 from being bent when the probe body 20 becomes longer due to the increase of the blast hole diameter have.

Fig. 4 is an enlarged view of the area H in Fig. 3, specifically showing the protective pipe 41 and the thermocouple 42. Fig. The protective pipe 41 may be disposed outside the thermocouple 42 with a predetermined space 42d. The thermocouple 42 is preferably provided with a metal protection tube 42c at its outermost portion, and a thermocouple wire 42a is protected by a refractory 42b.

6, the end of the thermocouple 42 is finished by the sealing fitting 46 and is connected to the thermocouple head 47 which extends outside the probe body 20 and serves as a terminal plate. As described above, the thermocouple wire 42a applied to the present invention has the largest diameter disposed at the center of the blast furnace, and the diameter gradually decreases toward the furnace side, thereby preventing the breakage of the thermocouple, .

The protection tube 41 and the probe body 20 are provided in a prefabricated structure that can be separated in the longitudinal direction so that the distal end portion where frequent thermal deformation and breakage, that is, the portion disposed at the center of the bladder can be replaced as needed. .

10 and 11, the probe body 20, like the I region shown in FIG. 10, may have a prefabricated structure that is coupled or separated by the bolts 24. FIG. In addition, the protective tube can also be configured to be separated into the foremost end portion 41a and the later-disposed portion 41b. To this end, a machined portion having different diameters, And may be composed of a plurality of protective tubes.

11 (a), the distal end portion of the probe body 20 is disassembled and the distal end of the probe body 20 is disassembled and the distal end portion 41a of the probe tube 20 is disassembled as shown in FIG. 11 (a) Can be removed and replaced.

11 (b), the rear end 41b of the protective pipe may be formed so as to be tapered, and the protective tube may be separated or combined by fitting the monotonic region 41c to the protective tube distal end portion 41a. The prefabricated structure that can be configured in various embodiments as described above is not limited by the present invention, and can be suitably modified by those skilled in the art.

In addition, the heat-resistant cover 23 can be mounted as shown in FIG. 5 so as to prevent breakage of the tip end portion of the probe body 20. The heat-resistant cover 23 may be made of a material such as a heat-resistant steel sheet having high durability, but this is also a matter that can be changed by those skilled in the art. However, when the heat-resistant cover 23 is mounted, the cover through hole 23a must be provided at a position corresponding to the measurement hole 21 of the probe body 20 so that gas can flow smoothly.

7, the purge means 60 according to a preferred embodiment of the present invention is connected to the probe body 20 inserted in the blast furnace 1, and the probe body and the purge means are respectively connected to the control means 80). The purge means 60 is connected to the probe body 20 to remove foreign matter such as dust which can be attached to the probe body 20 by supplying nitrogen gas. At this time, although nitrogen gas is adopted as the fluid in the present invention, the kind thereof is not limited within the range applicable in the blast furnace operating environment.

The nitrogen gas is injected at a high pressure and is discharged to the outside with foreign matter inside the probe body 20. [ Therefore, since the measurement hole 21 is not clogged by the foreign object, the flow inside the probe body is smooth and the temperature inside the probe body 20 can be prevented from rising due to the smooth circulation of the fluid. Therefore, the purge means removes foreign matter from the inside of the probe body and cools the inside of the probe body 20.

The purge means 60 supplies nitrogen gas from the main nitrogen gas supply means (not shown), and stores a predetermined amount of the nitrogen gas. That is, as shown in Fig. 8, nitrogen gas is supplied through the main pipe 63a, and an appropriate capacity is stored in the fluid tank 63. [

The supply line 61 is also connected to the protective pipe 41 through the supply line 61. Since the present invention provides six protective pipes 41 as an example, And are connected to the protective pipe 41 in a one-to-one manner.

A T-shaped pipe 51 is connected to the end of the protective pipe 41 exposed to the outside of the socket 16 connected to the rear of the flange of the probe body 20 from the fluid tank 63 for a predetermined length, 51 are fitted to the end of the sealing member 52. A supply line 61 is connected to the lower portion of the T-shaped pipe, and the supply line is connected to the fluid tank.

At this time, the supply line 61 is provided with the supply valve 62, and according to the preferred embodiment of the present invention, the six supply valves 62 may be installed in each of the six supply lines 61. The supply valve 62 may be provided as a diaphragm valve for collecting the nitrogen gas stored in the fluid tank 63 and supplying the nitrogen gas to the one protection valve through one valve.

That is, when the pressure gauge 64 provided in the fluid tank 63 indicates a pressure higher than a certain level, only one diaphragm valve is opened to move all of the nitrogen gas in the fluid tank to one supply line 61. Then, high-pressure nitrogen gas is supplied to one protective pipe 41, flows along the nitrogen gas discharge direction 67 as shown in FIG. 5, and finally discharged through the measurement hole 21, The foreign matter such as dust adhering to the periphery of the inlet of the measurement hole 21 is removed at a high pressure.

The diaphragm valves can be automatically controlled to be connected to the relay time control box 65 and the pulse range control box 66, respectively, in order to repeat such operations more conveniently. Here, the relay time control box controls the time from when one diaphragm valve is opened and then closed to when the next diaphragm valve is opened. That is, the time from when all the nitrogen gas in the fluid tank 63 is exhausted to when the nitrogen gas is supplied through the main pipe 63a and a certain amount is stored in the fluid tank 63 is outputted to the relay time control box The settings can be saved.

The pulse range control box 66 sets the time at which one diaphragm valve is opened. After the set time in the pulse range control box 66, the diaphragm valve is closed and the supply of the nitrogen gas is interrupted. According to such a configuration, a plurality of diaphragm valves can be sequentially opened and closed. According to such a nitrogen gas supply system, it is possible to effectively remove foreign matter in the protective pipe 41 with high-pressure nitrogen gas, It is possible to improve the cooling performance by increasing the amount of the nitrogen gas.

In the following, the thermocouple separating means 90 provided at the rear end of the protective pipe 41 will be described with reference to Fig. This is for facilitating the replacement operation of the damaged thermocouple during operation, in the same manner as installing the probe body and the protective pipe in a detachable prefabricated structure.

A T-shaped pipe 51 is provided at the rear end of the protective pipe 41, and a supply line 61 is connected to the lower end of the pipe. However, the ball valve 91, the cooling induction pipe 92, and the sealing member 93 are fastened to the rear end of the T-shaped pipe 51.

The ball valve 91 is a type of valve that operates by the principle of opening or closing a valve by opening or closing a passage by rotating a spherical valve by means of a spherical valve having a hole formed in the valve opening / closing part. It is possible to open and close by operating the handle, and when the valve is completely opened, it has almost the same cross sectional area as the connected pipe, and therefore the flow resistance of the fluid is small.

The cooling induction pipe 92 connected to the ball valve 91 is configured to allow the high temperature thermocouple 42 partially exposed to the outside of the protective pipe 41 to stay for a while and to be cooled.

The replacement operation of the thermocouple 42 will now be described. First, the sealing member 93 is removed and the cooling induction pipe 92 is opened. The ball valve 91 is opened to discharge the gas inside the protective pipe 41 and the end of the thermocouple 42 is moved to the cooling induction pipe 92 so that a part of the thermocouple 42 is connected to the cooling induction pipe 92 I will stay.

The thermocouple 42 is moved to the outside of the cooling induction pipe 92 and is completely removed from the protective pipe 41 when it is determined that the high temperature thermocouple 42 has cooled to some extent. The thermocouple to be replaced is prepared and inserted into the protective pipe 41 through the cooling induction pipe 92. The ball valve 91 is closed again and the cooling induction pipe 92 is closed with the sealing member 93 The gas is prevented from leaking to complete the thermocouple replacement operation.

According to the above configuration, since only the thermoelectric transformer damaged during operation can be easily replaced, the efficiency of operation can be improved.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be apparent to those of ordinary skill in the art.

1: blast furnace 4: charge
10: Nogu 11: Flange
11a: Body 12: Nitrogen gas supply pipe
13: Nitrogen gas discharge pipe 14: Thermocouple
15: gas inlet pipe 16: socket
20: probe body 41: protective tube
42: thermocouple 43: hole for vent
44: bending prevention member 60: purge means
80: control means 90: thermocouple separation means

Claims (7)

A probe body inserted into the corona barrel and provided with a measurement hole longitudinally opened to communicate with the outside;
A protective tube disposed at different positions in the longitudinal direction of the probe body in the probe body;
Temperature measuring means installed in the probe body for measuring a temperature inside the blast furnace; And
And a purge unit installed on the probe body to supply fluid to the probe body to be connected to the temperature measuring unit,
A T-shaped pipe provided at a rear end of the protective pipe;
A ball valve connected to a rear end of the T-shaped pipe;
A cooling induction pipe connected to the ball valve; And
A sealing member connected to the cooling induction pipe;
Further comprising an internal temperature sensor.
The method according to claim 1,
The probe body includes:
A plurality of measurement holes are provided to be spaced apart from each other by a predetermined distance,
And a plurality of inflow passages connecting the measurement hole and the temperature measurement means,
Wherein the measuring hole, the temperature measuring means, and the inflow passage correspond to each other one-to-one, and the inflow passage is disposed on the same line as the measurement hole.
The method according to claim 1,
Wherein the temperature measuring means comprises:
A thermocouple installed inside the protective pipe; And
A vent hole provided at one side of the probe body;
And a temperature sensor for measuring a temperature of the inside of the blast furnace.
2. The apparatus according to claim 1,
A fluid tank for storing fluid;
A plurality of supply lines connecting the fluid tank and the protection tube provided in the temperature measurement means one by one to supply fluid; And
And a plurality of supply valves installed in each of the supply lines and opened by a control means when the pressure inside the fluid tank reaches a certain level,
The supply valve is opened at any one time and the fluid in the fluid tank is supplied through the supply line connected to one open supply valve at a time to remove foreign matter from the probe body, And the cooling water is cooled.
The method according to claim 1,
The protection tube and the probe body may be formed of a metal,
Wherein the temperature sensor is provided in a prefabricated state separated in the longitudinal direction.
delete 6. The method according to any one of claims 1 to 5,
The probe body includes:
A heat-resistant cover coupled to the outside of the measurement hole and penetrating a position corresponding to the measurement hole;
Further comprising a temperature sensor for measuring the internal temperature of the blast furnace.

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