Blast furnace top circumferential plane temperature measuring device and method

Abstract

The invention relates to a blast furnace top circumferential plane temperature measuring device and method, the blast furnace top circumferential plane temperature measuring device comprises wireless temperature measuring devices, a furnace outside wireless receiving device and a monitoring system, more than three wireless temperature measuring devices are arranged along the length direction of a furnace top distribution chute, and the wireless temperature measuring devices are welded on the outer wall of the furnace top distribution chute; the wireless temperature measuring device is communicated with a monitoring system through an out-of-furnace wireless receiving device, and the out-of-furnace wireless receiving device is used for converting wireless signals into electric signals. The method has the advantages that the wireless temperature measuring device is installed on the outer wall of the chute, impact of material flow on temperature measuring components is avoided, meanwhile, temperature measuring auxiliary hardware does not need to be added in the furnace top space, and interference on furnace top material flow is avoided; temperature measurement of the whole circumferential plane of the blast furnace top is achieved, temperature distribution of the circumferential plane of the blast furnace top is obtained, the gas flow distribution state and uniformity of the circumferential plane are reflected, and great significance is achieved for evaluating the uniformity of circumferential gas flow in the furnace.

Description

Technical Field

[0001] The present invention belongs to the technical field of blast furnace top detection, and in particular relates to a blast furnace top circumferential plane temperature measurement device and method. Background Art

[0002] The top of a blast furnace is a high-temperature, enclosed space filled with high-speed dust, making it very difficult to measure the gas temperature in this space. Currently, the top cross temperature measurement method is used as the main means of monitoring the top temperature and gas flow distribution, which plays an important role in the safe, stable and efficient operation of the blast furnace. The top cross temperature measuring device is generally set at the bottom of the distribution chute. Due to the high temperature in the center of the blast furnace top, the sensor at the center of the cross temperature measuring device is easily damaged. In addition, due to the impact of the material flow from the distribution chute on the cross temperature measuring facility, the cross temperature measuring facility is easily damaged by the high temperature and high impact force. The replacement cycle after damage is long, making it impossible to judge the gas flow distribution on the top of the furnace in a timely manner. The purpose of long-term temperature measurement is completely unattainable, and the implementation of cross temperature measurement will also interfere with the direction of material flow, which will have an adverse effect on the blast furnace. Therefore, how to achieve rapid furnace start-up has always been a concern for ironmaking workers. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a blast furnace top circumferential plane temperature measurement device and method. By installing a wireless temperature measuring device on the back of the furnace top distribution chute, the gas temperature distribution of the furnace top circumferential plane at any inclination angle of the furnace top chute can be obtained, thereby realizing the temperature measurement of the high-temperature and high-speed airflow in the sealed space of the blast furnace top.

[0004] To achieve the above object, the present invention is implemented through the following technical solutions:

[0005] A blast furnace top circumferential plane temperature measuring device includes a wireless temperature measuring device, an external wireless receiving device, and a monitoring system. More than three wireless temperature measuring devices are arranged along the length of the furnace top distribution chute. The wireless temperature measuring devices are welded to the outer wall of the furnace top distribution chute. The wireless temperature measuring devices communicate with the monitoring system via the external wireless receiving device. The external wireless receiving device is used to convert wireless signals into electrical signals.

[0006] The wireless temperature measuring device includes an insulation box and a temperature measuring thermocouple, an information processor, a wireless transmitter, and a battery arranged in the insulation box; there are more than two temperature measuring thermocouples, the temperature measuring thermocouple and the wireless transmitter are connected to the information processor, and the battery powers the information processor and the wireless transmitter.

[0007] The wireless temperature measuring devices are evenly distributed along the length direction of the furnace top material distribution chute, and the bottom and top of the furnace top material distribution chute are both provided with wireless temperature measuring devices.

[0008] The wireless temperature measuring device is welded on the center line of the outer wall on both sides of the furnace top material distribution chute.

[0009] The wireless receiving device outside the furnace is installed on the furnace top platform.

[0010] The monitoring system comprises a temperature collection unit and a server. The temperature collection unit is connected to the server and is connected to a wireless receiving device outside the furnace.

[0011] A blast furnace top circular plane temperature measurement method is disclosed. The method comprises the following steps: drawing a circular plane temperature diagram based on the bottom plane of a top distribution chute when the top distribution chute has a maximum inclination angle; using wireless temperature measurement data at the top of the top distribution chute as the central airflow temperature; using wireless temperature measurement data at the bottom of the top distribution chute as the secondary edge airflow temperature data; using the blast furnace throat temperature as the edge airflow temperature; using the temperature difference displayed by wireless temperature measurement data of adjacent wireless temperature measurement devices on the top distribution chute when the top distribution chute has a minimum inclination angle as a basis for height compensation; performing linear or nonlinear fitting according to the temperature and height parameters of each point to obtain a fitting model; and correcting the wireless temperature measurement data of each point when the top distribution chute has a maximum inclination angle according to the fitting model.

[0012] The specific steps include:

[0013] 1) After the top distribution chute has finished distributing the material, it is lowered to the minimum inclination angle, and the temperature data of each measuring point from the bottom to the top of the top distribution chute are collected. With the temperature measuring point at the top of the top distribution chute as the origin, the corresponding relationship between position and temperature is established from the top of the top distribution chute to the zero point of the material line. Then, a linear fitting is performed based on the temperature and height parameters of each point to obtain the fitting model;

[0014] 2) In the distribution gap, the furnace top distribution chute is raised to the inclination angles of 25°, 35°, 45°, 55°, 65°, and 75°, and stays at the eight positions of 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°, and 360° for at least 3 seconds, and the temperature and position data are obtained. The corresponding fitting models are obtained according to the method in step 1);

[0015] 3) Counting the corresponding points on the vertical line of the remaining temperature measuring points except the temperature measuring points at the top and bottom of the furnace top distribution chute at the maximum inclination angle, establishing a statistical rule, and performing linear fitting based on the linear gradient principle of the same vertical line through the temperature and height parameters of the remaining temperature measuring points to obtain the temperature compensation formula of each temperature measuring point at the maximum inclination angle;

[0016] 4) Count the temperatures of the remaining temperature measuring points at the maximum inclination position of the furnace top distribution chute, calculate the circumferential plane temperature distribution of the furnace top at the temperature measuring point at the bottom of the furnace top distribution chute at the maximum inclination position according to the fitting model, and use the furnace throat temperature as the plane edge temperature to draw a circumferential plane temperature distribution diagram of the furnace top at the temperature measuring point at the bottom of the furnace top distribution chute at the maximum inclination position.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention installs a wireless temperature measuring device on the outer wall of the chute, avoiding the impact of the material flow on the temperature measuring components. At the same time, this method does not need to add temperature measurement auxiliary hardware in the furnace top space, avoiding interference with the furnace top material flow; the present invention converts the temperature signal into a wireless signal through a signal transmitting device, and the receiving device outside the furnace converts the wireless signal into an electrical signal. The temperature measurement of the high-temperature and high-speed airflow in the sealed space of the blast furnace top is realized through the transmitting and receiving devices, and the temperature measurement of the entire circumference of the blast furnace top is realized. The temperature distribution of the circumferential plane of the blast furnace top is obtained, which reflects the distribution state and uniformity of the coal gas flow in the circumferential plane, and is of great significance to the evaluation of the uniformity of the circumferential airflow in the furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the circumferential plane temperature measuring device on the top of a blast furnace.

[0020] Figure 2 It is a structural diagram of a wireless temperature measuring device.

[0021] Figure 3 It is a schematic diagram of the monitoring system.

[0022] Figure 4 This is a schematic diagram of the temperature measurement point locations at different inclination angles of the furnace top distribution chute.

[0023] Figure 5 It is the temperature distribution diagram of the furnace top circular plane.

[0024] In the figure: 1- furnace top material distribution chute, 2- wireless temperature measuring device, 3- wireless receiving device outside the furnace, 4- temperature collection unit, 5- server, 6- furnace throat couple, 7- thermal insulation box, 8- wireless transmitter, 9- battery, 10- information processor, 11- thermocouple. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below with reference to the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0026] Example:

[0027] 4038m 3 Taking the blast furnace top temperature measurement as an example, the blast furnace top distribution chute is 4.5 meters long, the furnace throat radius is 4.9m, the maximum inclination angle of the chute is 75°, and a throat thermocouple 6 is set at the furnace throat to measure the temperature at the furnace throat.

[0028] The 6-point wireless temperature measuring device is welded to the back of the furnace top distribution chute, with the average distance between two adjacent points being 0.9m; three external furnace wireless receiving devices are arranged outside the furnace, and the external furnace wireless receiving devices are installed next to the furnace top probe hoist, keeping them as close as possible to the furnace top distribution chute.

[0029] Blast furnace top circumferential plane temperature measurement method:

[0030] After the chute is fully distributed, it is lowered to a position with an inclination of 10°. The temperature measurement data from the bottom to the top of the furnace top distribution chute are 1230°C, 1080°C, 975°C, 858°C, 762°C, and 531°C, respectively. The top temperature measurement point of the furnace top distribution chute is taken as the origin, and the distance from the top to the upper edge of the throat steel brick (i.e., the material line zero point) is 6.27m. The corresponding relationship between temperature and position is established, as shown in Table 1. Linear fitting is performed based on the temperature and height parameters of each point, and Y=579.8+147.2X is obtained as the compensation basis for the central temperature measurement point T1.

[0031] Table 1 Temperature of each measuring point of the furnace top distribution chute at an inclination of 10°

[0032]

[0033]

[0034] Similarly, during the distribution gap, the furnace top distribution chute was raised to the inclination angles of 25°, 35°, 45°, 55°, 65°, and 75°, and stayed at the eight positions of 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°, and 360° for 3 seconds to obtain accurate temperature and position data, as shown in Tables 2, 3, 4, 5, 6, and 7.

[0035] Table 2 Temperatures of various measuring points at different circumferential positions of the furnace top distribution chute at an inclination of 25°

[0036] Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 0° Temperature / ℃ 535 753 845 879 890 925 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 45° Temperature / ℃ 534 752 844 878 889 924 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 90° Temperature / ℃ 536 754 846 880 891 926 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 135° Temperature / ℃ 533 751 843 877 888 923 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 180° Temperature / ℃ 537 755 847 881 892 927 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 225° Temperature / ℃ 539 757 849 883 894 929 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 270° Temperature / ℃ 537 755 847 881 892 927 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 315° Temperature / ℃ 534 752 844 878 889 924

[0037] Table 3 Temperatures of various measuring points at different circumferential positions of the furnace top distribution chute at an inclination of 35°

[0038] Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 0° Temperature / ℃ 528 748 809 818 745 435 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 45° Temperature / ℃ 528 748 809 818 745 432 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 90° Temperature / ℃ 529 749 810 819 746 433 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 135° Temperature / ℃ 527 747 808 817 744 436 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 180° Temperature / ℃ 528 748 809 818 745 432 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 225° Temperature / ℃ 524 744 805 814 741 436 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 270° Temperature / ℃ 526 746 807 816 743 438 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 315° Temperature / ℃ 528 748 809 818 745 440

[0039] Table 4 Temperatures of various measuring points at different circumferential positions of the furnace top distribution chute at an inclination angle of 45°

[0040] Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 0° Temperature / ℃ 530 725 785 659 400 325 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 45° Temperature / ℃ 532 724 788 660 402 330 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 90° Temperature / ℃ 535 722 786 652 402 331 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 135° Temperature / ℃ 529 720 770 648 405 325 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 180° Temperature / ℃ 528 719 772 660 395 328 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 225° Temperature / ℃ 530 722 785 658 390 329 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 270° Temperature / ℃ 533 723 780 658 398 330 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 315° Temperature / ℃ 535 721 785 653 399 330

[0041] Table 5 Temperatures of various measuring points at different circumferential positions of the furnace top distribution chute at an inclination angle of 55°

[0042] Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 0° Temperature / ℃ 532 700 710 525 236 282 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 45° Temperature / ℃ 529 701 709 525 236 285 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 90° Temperature / ℃ 522 705 715 532 236 281 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 135° Temperature / ℃ 526 699 713 525 236 283 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 180° Temperature / ℃ 535 698 711 529 236 282 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 225° Temperature / ℃ 522 701 719 521 236 281 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 270° Temperature / ℃ 529 703 715 522 236 283 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 315° Temperature / ℃ 528 701 713 521 236 281

[0043] Table 6 Temperatures of various measuring points at different circumferential positions of the furnace top distribution chute at an inclination of 65°

[0044]

[0045]

[0046] Table 7 Temperatures of various measuring points at different circumferential positions of the furnace top distribution chute at an inclination of 75°

[0047] Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 0° Temperature / ℃ 533 620 528 190 138 80 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 45° Temperature / ℃ 535 625 531 195 135 75 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 90° Temperature / ℃ 530 613 535 188 132 78 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 135° Temperature / ℃ 529 618 531 196 135 79 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 180° Temperature / ℃ 535 615 533 192 133 74 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 225° Temperature / ℃ 533 620 529 190 135 72 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 270° Temperature / ℃ 538 613 530 191 132 70 Circumferential direction Temperature point T1 T2 T3 T4 T5 T6 315° Temperature / ℃ 535 628 531 190 138 71

[0048] Take the calculation of the temperature distribution in the 0° direction of the furnace throat as an example, Figure 1 As shown, the corresponding points of T2, T3, T4, and T5 on the vertical line are counted respectively, and the statistical rules are established as shown in Table 8. According to Table 8, the temperatures of the corresponding points of T2, T3, T4, and T5 on the vertical line are counted as shown in Table 9. Linear fitting is performed through the temperature and height parameters of each point to obtain the temperature compensation formulas of the temperature measurement points T2, T3, T4, and T5 when the inclination angle is 75°;

[0049] T2 vertical line temperature compensation formula: Y = 606.9 + 123.3X

[0050] T3 vertical line temperature compensation formula: Y = 478.6 + 108.5X

[0051] T4 vertical line temperature compensation formula: Y = 175.8 + 93.6X

[0052] T5 vertical line temperature compensation formula: Y = 82.9 + 62.18X

[0053] Table 8 Statistics rules for corresponding points on the same vertical line

[0054]

[0055] Table 9 Temperature distribution of corresponding points on different vertical lines at 0° direction around the furnace throat

[0056]

[0057] According to this method, the temperature compensation formulas for each vertical line at eight positions of 45°, 90°, 135°, 180°, 225°, 270°, 315°, and 360° on the circular plane can be obtained in sequence.

[0058] The throat temperature is shown in Table 10. The throat temperature is used as the plane edge temperature. At the same time, the temperature of each measuring point at the 75° inclination position of the furnace top distribution chute is counted. The temperature distribution of each direction of the furnace top circumferential plane at the 75° inclination position T6 temperature measuring point (1.165m vertical height from the top of the furnace top distribution chute) is calculated according to the fitting formula, as shown in Table 11. The data are plotted. Figure 2 The temperature distribution diagram of the furnace top circular plane is shown.

[0059] Table 10 Throat temperature distribution

[0060]

[0061] Table 11 Temperature distribution in the circumferential plane of the furnace top at a vertical height of 1.165m from the top of the distribution chute at the furnace top when the inclination angle is 75°

[0062] t1 t2 t3 t4 t5 T6 Throat temperature 0° 751 750 604 284 155 80 49 45° 753 752 605 286 152 75 50 90° 749 750 602 288 158 78 52 135° 750 755 601 285 153 79 50 180° 752 749 605 283 150 74 48 225° 755 748 603 281 152 72 52 270° 751 752 602 280 150 70 53 315° 749 753 605 283 154 71 52

[0063] A circumferential plane temperature diagram is drawn on the plane when the furnace top distribution chute has the maximum inclination angle. The wireless temperature measurement data at the top of the furnace top distribution chute is used as the central airflow temperature, the wireless temperature measurement data at the bottom of the furnace top distribution chute is used as the sub-edge airflow temperature data, and the throat temperature of the blast furnace body is used as the edge airflow temperature. A circumferential plane gas temperature distribution diagram of the furnace top under the inclination angle of the chute temperature measurement point at the maximum inclination angle is drawn to realize full-plane temperature measurement of high-temperature and high-speed airflow in the confined space of the blast furnace.

Claims

1. A blast furnace top circumferential plane temperature measuring device, characterized in that: It includes a wireless temperature measuring device, a wireless receiving device outside the furnace, and a monitoring system. More than three wireless temperature measuring devices are arranged along the length of the furnace top material distribution chute. The wireless temperature measuring device is welded on the outer wall of the furnace top material distribution chute. The wireless temperature measuring device communicates with the monitoring system through the wireless receiving device outside the furnace. The wireless receiving device outside the furnace is used to convert the wireless signal into an electrical signal.

2. A blast furnace top circumferential plane temperature measuring device according to claim 1, characterized in that: The wireless temperature measuring device includes an insulation box and a temperature measuring thermocouple, an information processor, a wireless transmitter, and a battery arranged in the insulation box; there are more than two temperature measuring thermocouples, the temperature measuring thermocouple and the wireless transmitter are connected to the information processor, and the battery powers the information processor and the wireless transmitter.

3. The blast furnace top circumferential plane temperature measuring device according to claim 1, characterized in that: The wireless temperature measuring devices are evenly distributed along the length direction of the furnace top material distribution chute, and the bottom and top of the furnace top material distribution chute are both provided with wireless temperature measuring devices.

4. The blast furnace top circumferential plane temperature measuring device according to claim 1, characterized in that: The wireless temperature measuring device is welded on the center line of the outer wall on both sides of the furnace top material distribution chute.

5. The blast furnace top circumferential plane temperature measuring device according to claim 1, characterized in that: The wireless receiving device outside the furnace is installed on the furnace top platform.

6. The blast furnace top circumferential plane temperature measuring device according to claim 5, characterized in that: The monitoring system comprises a temperature collection unit and a server. The temperature collection unit is connected to the server and is connected to a wireless receiving device outside the furnace.

7. A method for measuring the circumferential plane temperature of a blast furnace top using the device according to any one of claims 1 to 6, characterized in that: A circumferential plane temperature diagram is drawn on the bottom plane of the furnace top distribution chute when the furnace top distribution chute has the maximum inclination angle. The wireless temperature measurement data at the top of the furnace top distribution chute is used as the central airflow temperature, the wireless temperature measurement data at the bottom of the furnace top distribution chute is used as the sub-edge airflow temperature data, the blast furnace throat temperature is used as the edge airflow temperature, and the temperature difference displayed by the wireless temperature measurement data of adjacent wireless temperature measuring devices on the furnace top distribution chute when the furnace top distribution chute has the minimum inclination angle is used as the basis for height compensation. Linear or nonlinear fitting is performed according to the temperature and height parameters of each point to obtain a fitting model, and the wireless temperature measurement data of each point when the furnace top distribution chute has the maximum inclination angle is corrected according to the fitting model.

8. A method for measuring temperature of a blast furnace top circumferential plane according to claim 7, characterized in that: The specific steps include: 1) After the top distribution chute has finished distributing the material, it is lowered to the minimum inclination angle, and the temperature data of each measuring point from the bottom to the top of the top distribution chute are collected. With the temperature measuring point at the top of the top distribution chute as the origin, the corresponding relationship between position and temperature is established from the top of the top distribution chute to the zero point of the material line. Then, a linear fitting is performed based on the temperature and height parameters of each point to obtain the fitting model; 2) In the distribution gap, the furnace top distribution chute is raised to the inclination angles of 25°, 35°, 45°, 55°, 65°, and 75°, and stays at the eight positions of 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°, and 360° for at least 3 seconds, and the temperature and position data are obtained. The corresponding fitting models are obtained according to the method in step 1); 3) Counting the corresponding points on the vertical line of the remaining temperature measuring points except the temperature measuring points at the top and bottom of the furnace top distribution chute at the maximum inclination angle, establishing a statistical rule, and performing linear fitting based on the linear gradient principle of the same vertical line through the temperature and height parameters of the remaining temperature measuring points to obtain the temperature compensation formula of each temperature measuring point at the maximum inclination angle; 4) Count the temperatures of the remaining temperature measuring points at the maximum inclination position of the furnace top distribution chute, calculate the circumferential plane temperature distribution of the furnace top at the temperature measuring point at the bottom of the furnace top distribution chute at the maximum inclination position according to the fitting model, and use the furnace throat temperature as the plane edge temperature to draw a circumferential plane temperature distribution diagram of the furnace top at the temperature measuring point at the bottom of the furnace top distribution chute at the maximum inclination position.

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