JP4676913B2 - Hot stove brick temperature measuring device and method for mounting the temperature measuring device - Google Patents

Description

  The present invention relates to a hot stove brick temperature measuring device for measuring the temperature of a regenerative brick of a hot stove supplying hot air to a blast furnace and an attaching method for attaching the hot stove brick temperature measuring device to the hot stove.

  A hot blast furnace that supplies hot blast to the blast furnace is known as an auxiliary facility of the blast furnace (Patent Document 1).

  FIG. 2 is a longitudinal sectional view showing a schematic configuration of the hot stove. In FIG. 2, the hot stove 100 is configured by a heat storage chamber 101 that gives heat to blowing to the blast furnace and a combustion chamber 102 for heating the heat storage chamber 101, and operates with one cycle of combustion and blowing.

  In the combustion chamber 102, the air blown from the lower air supply port 104 is mixed with the mixed gas of the blast furnace gas and the coke oven gas (or other high calorie gas) blown from the lower mixed gas supply port 103 and burned. Then, the combustion gas passes through the dome 109 and passes through the quartz brick 107, the high alumina brick 106, and the refractory clay brick 105 mainly composed of silica, which is a heat storage brick stacked in the heat storage chamber 101, and stores heat. Then, when cold air is introduced from the lower supply port 108 of the heat storage chamber 101, the cold air takes heat from the heat storage bricks, raises the temperature to about 900 ° C. to 1300 ° C., and passes through the hot air outlet 110 of the combustion chamber 102. It is blown into. Moreover, the outer peripheral surface of the quartz brick located in the lower end 107A of the quartz brick 107 piled up in the multi stage of the thermal storage chamber is used as the temperature measuring surface.

  And since the shrinkage | contraction rate changes remarkably at 500 degrees C or less, the lower limit management temperature is set to 550 degreeC in the quartz brick of a thermal storage chamber.

  As a hot stove brick temperature measuring apparatus, there exists a thing of the structure shown in FIG. FIG. 3A is a longitudinal sectional view of a hot stove brick temperature measuring device that measures the temperature of a quartz brick (silica brick that forms a temperature measuring surface is hereinafter referred to as a checker brick) using, for example, a thermocouple type temperature sensor. FIG. 4 is a simplified cross-sectional view showing a contact portion between a temperature sensor and a checker brick.

  In FIG. 3, a protection tube 22 filled with mortar as a press-fitting material is attached to a thermometer insertion hole 21 formed along the radial direction of the peripheral wall 20 of the heat storage chamber, and a thermocouple temperature sensor 23 is connected to the protection tube 22. The mortar 26 is filled between the protective tube 22 and the temperature sensor 23 until it is in contact with the checker brick 24 through the inside.

As a temperature measuring device that measures the temperature of refractory bricks, a thermometer is inserted into the protective tube,
A configuration in which the tip of the thermometer is protruded from the tip of the protective tube is known (Patent Document 2).
JP 2005-325446 A JP-A-9-282384

  The temperature of the silica brick 24 measured by the temperature sensor 23 rises at the time of combustion and repeats a periodic change that falls at the time of blowing. In the heat accumulating chamber, there is a state in which the heat accumulating chamber is exhausted when switching from blowing to combustion, and the temperature measured by the temperature sensor 23 tends to rapidly decrease during the exhaust pressure.

The cause of the rapid decrease in the temperature measured by the temperature sensor 23 during the exhaust pressure is that the outside air is in the heat storage chamber as indicated by the solid line A as shown in the solid line A in the gap between the thermometer insertion hole 21 and the protective tube 22. The airflow (backwind) entering the interior is mentioned. Various measures have been tried to prevent this backwind, but it is still not sufficient.

  On the other hand, as described above, the tip of the temperature sensor 23 is brought into contact with the outer peripheral surface of the checker brick 24 which is a temperature measuring surface, but the outer peripheral surface of the checker brick 24 has an uneven surface, so it is halfway. There may be a contact state.

  The back wind circulates between the tip of the temperature sensor 23 in the halfway contact state and the checker brick 24 as shown by a dotted line B, and the actual checker brick 24 temperature is set to 550 ° C. which is the lower limit control temperature. Even if it exceeds the value, there is a possibility that the measurement accuracy will be greatly deteriorated such that the measured value falls below the lower limit control temperature.

  For this reason, it is possible to maintain the lower limit management temperature by increasing the heat storage amount of the heat storage chamber so that the measured value of the temperature sensor 23 does not become the lower limit management temperature or less, but leave the wasteful heat amount in the heat storage chamber. Therefore, there is a problem that efficient operation cannot be performed.

  The object of the present invention is to solve such a conventional problem, and it is possible to minimize the influence of the generated back wind on temperature measurement, and the temperature sensor abuts against the checker brick. An object of the present invention is to provide a hot stove brick temperature measuring device capable of measuring the temperature of a checker brick with high accuracy regardless of the position.

  Another object of the present invention is to provide a method for attaching a hot stove brick temperature measuring device that realizes the object of the invention described above.

The 1st structure of the hot stove brick temperature measuring apparatus which implement | achieves the objective of this invention is the temperature of the thermal storage brick arrange | positioned in the thermal storage chamber of the hot stove which gives heat to the ventilation to a blast furnace as described in Claim 1. In the hot stove brick temperature measuring device for measuring the heat storage chamber, a protective tube that penetrates the peripheral wall of the heat storage chamber along the radial direction, the penetrating tip contacts the outer peripheral surface of the heat storage brick, and is inserted into the protective tube, the insertion tip is A temperature sensor that contacts the outer peripheral surface of the heat storage brick, a heat insulating member that covers the outer periphery of the protective tube, a front end portion of the temperature sensor that is filled in the front end portion of the protective tube, and the front end of the protective tube It has contact with the outer peripheral surface of the said thermal storage brick facing an opening, It has the heat conductivity of the thermal storage brick which contacts, and the heat-transfer member which is in 20% of soil range, It is characterized by the above-mentioned.

Mounting of a hot air furnace brick temperature measuring apparatus for realizing the object of the present invention, as described in claim 2, a hot air oven brick temperature measurement mounting the hot-air furnace brick temperature measuring device of the first configuration described above in the heat storage chamber A method of mounting the apparatus, in which a heat transfer member is filled in the tip of a protective tube whose outer periphery is covered with a heat insulating member and the temperature sensor is inserted, and the tip of the protective tube contacts the outer peripheral surface of the heat storage brick. After inserting into the thermometer insertion hole of the heat storage chamber until contact, press the protective tube against the outer peripheral surface of the heat storage brick, and then press the temperature sensor into the protective tube, that is brought into contact with the outer peripheral surface of the heat storage brick tip of the temperature sensor is embedded in the heat transfer member with contacting part protective tube by extrusion in the heat storage brick side from the tip of the outer peripheral surface of the thermal storage brick Features and That.

  According to the hot-blast furnace brick temperature measuring device according to the present invention, even if a back wind is generated when the heat storage chamber is exhausted, the phenomenon that the tip of the temperature sensor changes more than the heat storage brick through the protective tube by the heat insulating member is suppressed and protected. Since the tip of the temperature sensor is surrounded by the tip of the tube, the tip of the temperature sensor is not directly exposed to the gas flow caused by the back wind, and the contact area with the heat storage brick can be increased by the heat transfer member. . For this reason, the temperature sensor can measure the temperature of the heat storage brick with high accuracy even at the time of exhaust pressure.

  According to the mounting method of the hot stove brick temperature measuring device according to the present invention, the heat transfer member can be brought into contact with the outer peripheral surface of the heat storage brick from the outside of the heat storage chamber in a state where the heat transfer member is filled in the protective tube.

  Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

  FIG. 1 is a cross-sectional view showing the tip of a temperature sensor in a hot stove brick temperature measuring device.

  In FIG. 1, the hot stove brick temperature measuring apparatus in the present embodiment allows a protective tube 22 to pass through a thermometer insertion hole provided in the peripheral wall 20 of the heat storage chamber 101 shown in FIG. It is in contact with the outer peripheral end face. Further, the rod-shaped temperature sensor 23 that is a thermocouple thermometer disposed in the protective tube 22 has a tip abutting against the outer peripheral surface of the checker brick 24. Therefore, the tip of the temperature sensor 23 is surrounded by the protective tube 22, and the tip of the temperature sensor 23 is prevented from being directly exposed to the gas flows A and B shown in FIG.

  Further, when the protective tube 22 is inserted into the thermometer insertion hole 21, the heat transfer member 1 having a thermal conductivity equivalent to that of the checker brick 24 is filled in the tip portion of the protective tube 22 in advance and the temperature is increased. The temperature sensor 23 is inserted to such an extent that the tip of the sensor 23 comes into contact with the filled heat transfer member. After the protection tube 22 is inserted into contact with the checker brick 24, the tip of the temperature sensor 23 is Insert until the outer periphery of the checker brick 24 abuts. Along with this, the heat transfer member 1 is pushed toward the outer peripheral surface of the checker brick 24, and a part of the pushed heat transfer member 1 is filled into the recess 24a formed on the outer periphery of the checker brick 24. The other part is pressed against and closely contacts the convex part 24 b formed on the outer peripheral surface of the checker brick 24.

The heat transfer member 1 in this embodiment uses ply ram (TM) material (thermal conductivity 1.2w / m / k). In addition, the thermal conductivity of the quartz brick is 1.4 w / m / k, and if the difference in thermal conductivity is within the range of 20% soil, there is no problem in error in temperature measurement.

  The tip portion of the temperature sensor 23 is in contact with the heat transfer member 1 filled in the inner diameter portion of the protective tube 22, and since this heat transfer member 1 is in close contact with the outer peripheral surface of the checker brick 24, there is no circulation of back air. In addition, the contact area of the tip of the temperature sensor 23 with the outer peripheral surface of the checker brick 24 becomes large, and the heat conductivity of the heat transfer member 1 is equivalent to that of the checker brick 24, so the temperature of the checker brick 24 can be set with high accuracy. It becomes possible to measure the temperature.

  1 shows a state in which the tip of the temperature sensor 23 is in contact with the corner of the recess 24a of the checker brick 24, the tip of the temperature sensor 23 is not always in contact in such a state, When the checker brick moves due to a temperature change or the like, the contact portion changes. However, since the heat transfer member 1 is in contact with the outer peripheral surface of the checker brick 24, the temperature sensor 23 measures the temperature of the checker brick 24 with high accuracy. be able to.

  Further, since the heat insulating wool 2 as a heat insulating material is wound around the outer periphery of the protective tube 22, even if the back wind A is generated, the tip of the temperature sensor 23 is passed through the protective tube 22 by the back air A shown in FIG. It was possible to suppress the phenomenon of changing beyond the brick temperature.

  According to the present invention, the temperature of the checker brick by the temperature sensor at the time of exhaust pressure can be measured with high accuracy, so that it is possible to control the combustion and blowing of the hot stove with high efficiency.

The cross-sectional view which shows the front-end | tip part of the temperature sensor in the hot stove brick temperature measuring apparatus which shows the Example of this invention. The longitudinal cross-sectional view which shows schematic structure of the hot stove to which the hot stove brick temperature measuring apparatus of FIG. 1 is attached. The conventional hot stove brick temperature measuring apparatus is shown, (a) is a longitudinal cross-sectional view which shows the whole apparatus, (b) is a cross-sectional view which shows the contact part of a temperature sensor and a checker brick.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat transfer member 2 Heat insulation member 20 Perimeter wall 21 Thermometer insertion hole 22 Protective tube 23 Temperature sensor 24 Checker brick 25 Sealing member 100 Hot-blast furnace 101 Thermal storage chamber 102 Combustion chamber 103 Mixed gas supply port 104 Air supply port 105 Refractory clay brick 106 High alumina brick 107 Silica brick 108 Lower supply port 109 Dome

Claims (2)

In the hot stove brick temperature measuring device that measures the temperature of the heat storage bricks arranged in the heat storage chamber of the hot stove that gives heat to the air blowing to the blast furnace,
Protecting tube that penetrates the peripheral wall of the heat storage chamber along the radial direction, the penetrating tip contacts the outer peripheral surface of the heat storage brick,
A temperature sensor inserted into the protective tube, the insertion tip of which contacts the outer peripheral surface of the heat storage brick;
A heat insulating member covering the outer periphery of the protective tube;
The tip of the protective tube is filled in and embedded in the tip of the temperature sensor, and is in contact with the outer peripheral surface of the heat storage brick facing the tip opening of the protection tube, and the thermal conductivity and soil of the heat storage brick in contact A heat transfer member within a 20% range ;
A hot stove brick temperature measuring device characterized by comprising: A hot stove brick temperature measuring device mounting method for mounting the hot stove brick temperature measuring device according to claim 1 to a heat storage chamber,
The tip of the protective tube whose outer periphery is covered with a heat insulating member is filled with a heat transfer member, and the temperature sensor is inserted, and the thermometer in the heat storage chamber until the tip of the protective tube contacts the outer peripheral surface of the heat storage brick. After the insertion into the insertion hole, the protective tube is pressed against the outer peripheral surface of the heat storage brick, and then the temperature sensor is pushed into the protective tube, and a part of the heat transfer member at the tip of the protective tube is inserted from the tip of the protective tube. a hot air oven brick temperature measurement tip of the temperature sensor is equal to or to abut the outer peripheral surface of the heat storage bricks are embedded in the heat transfer member with contacting the outer peripheral surface of the thermal storage bricks by extrusion in the heat storage brick side How to install the device.

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