Temperature measuring device for tuyere at initial stage of blast furnace air supply

Abstract

The utility model relates to the technical field of blast furnace air supply initial stage tuyere hot air temperature measurement, and discloses a blast furnace air supply initial stage tuyere temperature measuring device which comprises a protection cavity and a thermocouple inserted from one end of the protection cavity, the inner wall of the protection cavity is fixedly connected with a partition plate, and a through hole matched with the thermocouple is formed in the middle of the partition plate in a penetrating mode. The side, close to the thermocouple, of the partition plate is connected with an induction mechanism. According to the blast furnace air supply initial stage tuyere temperature measuring device, the interior of the protection cavity is divided into two areas through the partition plate, when the thermocouple is pulled out of the protection cavity and the induction mechanism detects that the thermocouple is pulled out of the through hole, the through hole is sealed through the sealing mechanism, and therefore the left end and the right end of the protection cavity are separated; high-temperature and high-pressure airflow is blocked at the end, close to the blast-furnace tuyere, of the protection wall body, when the thermocouple is pulled out of the protection cavity, no high-temperature and high-pressure airflow rushes out of the tail end of the protection cavity any more, and the safety of operators is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hot blast temperature measurement at the tuyere in the initial stage of blast furnace blowing, and specifically relates to a temperature measuring device for the tuyere in the initial stage of blast furnace blowing. Background Technique

[0002] Measuring the temperature of the tuyere in the initial stage of blast furnace blowing is an important task in the iron and steel production process, which is related to the thermal state control and production efficiency of the blast furnace; in the operation of the blast furnace, hot air (usually with a temperature above 1000 °C) is conveyed into the furnace through the tuyere to promote the reduction reaction of raw materials such as iron ore. In the initial stage of the blast furnace starting to blow, since the furnace has not yet reached a stable working state, the heat accumulation in the furnace is not sufficient, and the heat exchange between the hot air and the furnace charge has not reached an equilibrium state, so that the temperature at the tuyere may be relatively low, and with continuous blowing, the tuyere temperature may fluctuate greatly. In order to understand the temperature distribution in the furnace, ensure that the hot air can be effectively transferred to the furnace charge, reach the expected high temperature, and promote the progress of the reduction reaction, a temperature measuring device is usually installed at the blast furnace tuyere to monitor the temperature change of the blast furnace tuyere and ensure the smooth production operation of the blast furnace.

[0003] When measuring the temperature of the tuyere, a special temperature measuring instrument is usually used, such as an infrared thermometer or an inserted thermocouple, etc. In the initial stage of blast furnace blowing, due to large temperature fluctuations and relatively low temperatures, a thermocouple is usually used to measure the temperature at the tuyere position.

[0004] For example, the patent with the publication number CN206173377U discloses a temperature measuring device for the tuyere in the initial stage of blast furnace blowing, which includes a sealing protection device and a temperature measuring element. The sealing protection device is a hollow cavity with openings at both ends. The first end opening of the sealing protection device is connected to a coal injection lance, and the temperature measuring element can be inserted into the second end opening of the sealing protection device. After the temperature measuring element is inserted into the second end opening of the sealing protection device, the second end opening of the sealing protection device is sealed. It is suitable for measuring the temperature of the tuyere at the initial stage of blowing. The overall device structure and manufacturing process are simple and easy to produce. It can not only accurately measure the tuyere temperature in the low temperature range of 0 °C - 600 °C, but also ensure airtightness without leakage, and can be installed and removed online without affecting the normal production of the blast furnace. It can effectively guide the operation of the blast furnace and ensure the smooth progress of production.

[0005] However, the temperature measuring device in the above technology still has the following problems:

[0006] Although it is possible to install or remove the thermocouple online without affecting the normal production operation of the blast furnace, after the temperature measurement at the initial stage of the tuyere is completed, since the temperature at the tuyere of the blast furnace has risen to an extremely high temperature at this time, when the thermocouple is removed, the high-pressure air flow generated by the high temperature may be instantaneously ejected from the thermocouple insertion port along with the movement of removing the thermocouple, causing the operator to be burned by the high-temperature air flow and posing a great potential safety hazard. Summary of the Invention

[0007] In view of the deficiencies of the prior art, the present invention provides a temperature measurement device for the tuyere at the initial stage of blast furnace air supply. For example, when the thermocouple temperature detector is removed, the protective shell can be closed in advance, so as to avoid the ejection of high-temperature and high-pressure air flow from the thermocouple insertion and extraction port when the thermocouple is completely removed, and improve the operation safety of the operator.

[0008] To achieve the above object, the present invention provides the following technical solution: A temperature measurement device for the tuyere at the initial stage of blast furnace air supply, including a protective cavity and a thermocouple inserted from one end of the protective cavity. A partition is fixedly connected to the inner wall of the protective cavity. A through hole matching the thermocouple is formed through the middle position of the partition. A closing mechanism is connected in the through hole, and an induction mechanism is connected to the side of the partition close to the thermocouple.

[0009] Further, the closing mechanism includes a closing plate and a telescopic device. A contraction groove is formed at the top of the through hole. An installation cavity is formed at the top of the contraction groove. The telescopic device is fixedly connected to the installation cavity. The telescopic end of the telescopic device is fixedly connected to the closing plate. The closing plate is slidably connected to the contraction groove.

[0010] Further, an annular closing groove is formed on the inner wall of the through hole. The annular closing groove is communicated with the contraction groove. The closing plate is arranged to match the annular closing groove.

[0011] Further, the induction mechanism includes an infrared emitter and an infrared receiver. Both the infrared emitter and the infrared receiver are fixedly connected to the side of the partition close to the thermocouple, and the infrared emitter and the infrared receiver are respectively located on both sides of the through hole and are symmetrically arranged.

[0012] Further, heat insulation layers are provided on the side of the partition away from the thermocouple and on the inner wall of the through hole.

[0013] Further, an antioxidant layer is provided on the outer side of the end of the thermocouple inserted into the protective cavity.

[0014] Further, the thermocouple is a K-type, S-type or R-type thermocouple.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This kind of tuyere temperature measuring device at the initial stage of blast furnace air supply divides the inner part of the protection cavity into two regions through a partition board. When the thermocouple is inserted into the protection cavity, it passes through the perforation in the middle of the partition board for temperature measurement. When the temperature of the furnace tuyere rises to a stable value, the thermocouple is withdrawn from the protection cavity. When the induction mechanism detects that the thermocouple is withdrawn from the perforation, the perforation is closed through the closing mechanism, thereby separating the left and right ends of the protection cavity, blocking the high-temperature and high-pressure air flow at one end of the protection wall close to the blast furnace tuyere. When the thermocouple is withdrawn from the protection cavity, no high-temperature and high-pressure air flow rushes out from the end of the protection cavity, improving the safety of the operator. Description of the Drawings

[0017] Figure 1 It is a front view schematic diagram of the overall appearance connection structure of the present utility model;

[0018] Figure 2 It is a front view schematic diagram of the connection structure of the partition board of the present utility model from another angle;

[0019] Figure 3 It is a front view sectional schematic diagram of the connection structure of the partition board of the present utility model.

[0020] In the figure: 1. Protection cavity; 2. Thermocouple; 3. Partition board; 4. Closing plate; 5. Expander; 6. Infrared emitter; 7. Infrared receiver; 8. Heat insulation layer; 301. Perforation; 302. Shrinkage groove; 303. Installation cavity; 304. Annular closed groove. Detailed Embodiment

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0022] Please refer to Figure 1 - Figure 3 , a tuyere temperature measuring device at the initial stage of blast furnace air supply, including a protection cavity 1 and a thermocouple 2 inserted from one end of the protection cavity 1. The inner wall of the protection cavity 1 is fixedly connected with a partition board 3. A perforation 301 matching the thermocouple 2 is penetrated and opened at the middle position of the partition board 3. A closing mechanism is connected in the perforation 301, and an induction mechanism is connected to one side of the partition board 3 close to the thermocouple 2.

[0023] As Figure 1 - Figure 3 shown, a tuyere temperature measuring device at the initial stage of blast furnace air supply in the present utility model is similar in structure to the existing tuyere temperature measuring device at the initial stage of blast furnace air supply. For example, a tuyere temperature measuring device at the initial stage of blast furnace air supply disclosed in the patent with the publication number of CN206173377U. The main improvement point of the present utility model is to improve the safety when the temperature measuring device is removed from the blast furnace tuyere. As Figures 1 to 3As shown in the figure, when the blast furnace tuyere temperature measuring device in the utility model is in use, the thermocouple 2 is inserted from the end of the protection cavity 1, and then passes through the perforation 301 in the middle of the internal partition 3 of the protection cavity 1. The temperature of the blast furnace tuyere is monitored by the end of the thermocouple 2. When the temperature of the blast furnace tuyere gradually rises and stabilizes, the thermocouple 2 is pulled outwards. When the induction mechanism detects that the end of the thermocouple 2 has moved out of the perforation 301, the perforation 301 is blocked by the closing mechanism, so that the internal space of the protection cavity 1 is separated by the partition 3 and the closing mechanism in the first time, and the high-temperature and high-pressure air flow is blocked at one end of the protection cavity 1 close to the blast furnace. Then, the thermocouple 2 is continuously pulled out. At this time, no high-temperature and high-pressure air flow will be ejected from the insertion port of the thermocouple 2 at the end of the protection cavity 1, improving the safety of the operator.

[0024] As Figure 3 shown, the closing mechanism includes a closing plate 4 and a telescopic device 5. A contraction groove 302 is opened at the top of the perforation 301, and an installation cavity 303 is opened at the top of the contraction groove 302. The telescopic device 5 is fixedly connected to the installation cavity 303, the telescopic end of the telescopic device 5 is fixedly connected to the closing plate 4, and the closing plate 4 is slidably connected to the contraction groove 302. When the thermocouple 2 is inserted into the perforation 301, the closing plate 4 is contracted from the perforation 301 into the contraction groove 302 through the telescopic device 5, exposing the perforation 301 for the thermocouple 2 to pass through. When the thermocouple 2 is pulled out and moves out of the perforation 301, the closing plate 4 is quickly pushed from the contraction groove 302 to the position of the perforation 301 through the telescopic device 5, so as to block the perforation 301 and isolate the high-temperature air flow entering the interior of the protection cavity 1, ensuring that the high-temperature and high-pressure air flow will not flow into the rear end of the protection cavity 1 and cause harm to the operator. It should be particularly noted that the telescopic device 5 can be an electric push rod, a cylinder, etc., which can realize the quick braking of the closing plate 4 between the perforation 301 and the contraction groove 302.

[0025] As Figure 3 shown, an annular closing groove 304 is opened on the inner wall of the perforation 301. The annular closing groove 304 is communicated with the contraction groove 302, and the closing plate 4 is arranged in a matching manner with the annular closing groove 304. By opening the annular closing groove 304 on the inner wall of the perforation 301 and using the closing plate 4 that cooperates with it, the perforation 301 can be completely blocked. At the same time, by using the annular closing groove 304, when the high-pressure air flow impacts the closing plate 4, the closing effect of the closing plate 4 on the perforation 301 can be improved, and the high-pressure air flow is prevented from impacting and displacing the closing plate 4.

[0026] As Figure 1 - Figure 3As shown, the induction mechanism includes an infrared emitter 6 and an infrared receiver 7. Both the infrared emitter 6 and the infrared receiver 7 are fixedly connected to the side of the partition 3 close to the thermocouple 2, and the infrared emitter 6 and the infrared receiver 7 are respectively located on both sides of the perforation 301 and are symmetrically arranged. Through the cooperation of the infrared emitter 6 and the infrared receiver 7, it can be detected whether the thermocouple 2 is inserted into the perforation 301, so as to control the movement of the closing plate 4 by the controller through the expander 5. Both the infrared emitter 6 and the infrared receiver 7 use high-temperature resistant models.

[0027] As Figure 1 - Figure 3 shown, a heat insulation layer 8 is provided on both the side of the partition 3 away from the thermocouple 2 and the inner wall of the perforation 301. By providing the heat insulation layer 8 on the side wall of the partition 3 and the inner side of the perforation 301, the high temperature of the high-temperature gas flow at one end of the protection cavity 1 close to the blast furnace tuyere can be isolated, reducing the conduction of high temperature to the other side of the partition 3 after closing.

[0028] As Figure 1 - Figure 3 shown, an antioxidant layer is provided on the outer side of the end of the thermocouple 2 inserted into the protection cavity 1. By spraying the antioxidant layer at the insertion end of the thermocouple 2, the high-temperature oxidation of the end of the thermocouple 2 caused by the high-temperature gas flow can be reduced, and the service life of the thermocouple 2 can be improved.

[0029] As Figure 1 - Figure 3 shown, the thermocouple 2 is a K-type, S-type or R-type thermocouple. By using the K-type, S-type or R-type thermocouple 2, the temperature detection of the blast furnace tuyere can be maintained until the temperature of the blast furnace tuyere rises above one thousand degrees, ensuring continuous temperature measurement before the blast furnace tuyere enters normal air supply operation.

[0030] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A tuyere temperature measuring device at the initial stage of blast furnace blowing, comprising a protection cavity (1) and a thermocouple (2) inserted from one end of the protection cavity (1), characterized in that: The inner wall of the protection cavity (1) is fixedly connected with a partition board (3). A through hole (301) matching the thermocouple (2) is formed through the middle position of the partition board (3). A closing mechanism is connected in the through hole (301), and an induction mechanism is connected to one side of the partition board (3) close to the thermocouple (2).

2. The blast furnace tuyere temperature measuring device at the initial stage of blast supply according to claim 1, characterized in that: The closing mechanism includes a closing plate (4) and a telescopic device (5). A contraction groove (302) is formed at the top of the through hole (301). An installation cavity (303) is formed at the top of the contraction groove (302). The telescopic device (5) is fixedly connected with the installation cavity (303). The telescopic end of the telescopic device (5) is fixedly connected with the closing plate (4). The closing plate (4) is slidably connected with the contraction groove (302).

3. The blast furnace tuyere temperature measuring device at the initial stage of blast supply according to claim 2, wherein: An annular closing groove (304) is formed on the inner wall of the through hole (301). The annular closing groove (304) is communicated with the contraction groove (302). The closing plate (4) is arranged to match the annular closing groove (304).

4. A tuyere temperature measuring device for the initial stage of blast furnace air supply according to claim 1, 2 or 3, characterized in that: The induction mechanism includes an infrared emitter (6) and an infrared receiver (7). Both the infrared emitter (6) and the infrared receiver (7) are fixedly connected to one side of the partition board (3) close to the thermocouple (2), and the infrared emitter (6) and the infrared receiver (7) are respectively located on both sides of the through hole (301) and are symmetrically arranged.

5. A blast furnace tuyere temperature measuring device at the initial stage of air supply according to claim 1, 2 or 3, characterized in that: Heat insulation layers (8) are arranged on one side of the partition board (3) away from the thermocouple (2) and on the inner wall of the through hole (301).

6. The blast furnace tuyere temperature measuring device at the initial stage of air supply according to claim 1, 2 or 3, characterized in that: An antioxidant layer is arranged on the outer side of one end of the thermocouple (2) inserted into the protection cavity (1).

7. A blast furnace tuyere temperature measuring device at the initial stage of air supply according to claim 1, 2 or 3, characterized in that: The thermocouple (2) is a K-type, S-type or R-type thermocouple.

Images