A coke oven coke cake center infrared radiation temperature measuring device

Abstract

This invention provides an infrared radiation temperature measuring device for the center of coke oven cake, comprising a gas source and several infrared radiation temperature measuring units disposed on both sides of the coke guide grid in a coke quenching car. Each infrared radiation temperature measuring unit includes an insulating protective box, inside which is installed an infrared radiation thermometer. The infrared radiation thermometer is connected to a universal joint via an air purger. A viewing tube is provided on the other side of the universal joint. The universal joint is connected to a pressure plate and a mounting plate, and the mounting plate is connected to the insulating protective box. This invention enables continuous, accurate, and reliable measurement of the center temperature of coke oven cake under confined space and harsh measurement conditions, improving measurement accuracy and reducing manual maintenance costs.

Description

Technical Field

[0001] This utility model belongs to the field of infrared temperature measurement technology and relates to an infrared radiation temperature measurement device for the center of coke oven cake. Background Technology

[0002] The temperature at the center of the coke cake directly reflects whether the coke is uniformly matured. It is a comprehensive result of the horizontal heating and vertical heating of the coke oven, and is also an important basis for assessing whether the structure and heating system of the coke oven are perfect. The temperature at the center of the coke cake needs to be measured when changing the type of heating gas, coking time, coal type and ratio.

[0003] The measurement methods for the center temperature of coke cake in a transmission coke oven have gone through three stages: optical temperature measurement via tube insertion in the carbonization chamber, portable online coke cake center temperature measuring instrument, and automatic infrared measurement of coke cake surface temperature. The first two methods, requiring manual measurement, suffer from high labor intensity, cumbersome operation, long time, and high risk. They can only be measured at the coal feeding port, resulting in poor representativeness, difficulty in finding measurement points, and the possibility of human error, and have been gradually phased out by coking plants. Currently, domestic metallurgical enterprises are gradually adopting non-contact infrared radiation temperature measurement technology for coke cake center temperature measurement. However, in practical applications, the proximity to coke, high temperature, heavy dust, and easy contamination of the lens in the production environment lead to measurement errors mostly around ±4%F. Some temperature measurement systems, when interference factors are not properly handled, can even exceed ±10%, and continuous operation stability is difficult to guarantee, requiring manual maintenance once a week. The main reasons for this are as follows:

[0004] 1. Interference Effects: In existing applications of infrared radiation thermometry for measuring the center temperature of coke cakes, there are intermediate interfering media such as CO2, dust, and smoke in the optical path between the thermometer and the target body. These media absorb, scatter, and reflect the radiation energy of the target body, causing attenuation effects. The degree of influence depends on the amount of interfering media and the spectral response characteristics of the infrared radiation thermometer. For example, when using a monochromatic infrared thermometer, the unique smoke and dust on site accumulate in the infrared emission window, changing the infrared transmittance and reducing the emitted energy. This results in the measured temperature being lower than the actual temperature, requiring frequent cleaning of the infrared emission window. However, it is difficult to determine the standard for the extent of cleaning.

[0005] 2. Influence of ambient temperature: Most existing coke cake center temperature measurement systems in China use integrated infrared radiation thermometers. The measurement errors caused by temperature drift due to changes in ambient temperature have not received sufficient attention or measures. Since the infrared radiation thermometer is installed on the coke guide grid, the installation space is small and it is located in a place with large temperature changes and poor environmental conditions. If the infrared thermometer does not adopt effective heat insulation technology and measures, it will bring a considerable additional error due to ambient temperature.

[0006] 3. Single-point measurement is used; currently, the measurement accuracy is affected by the shape, distribution and condition of the coke cake, and cannot accurately reflect the center temperature of the coke cake. Utility Model Content

[0007] The purpose of this invention is to address the problems existing in the prior art by providing an infrared radiation temperature measuring device for the center of coke oven cakes. This solves the problem that existing infrared radiation temperature measuring methods are easily affected by intermediate media such as CO2, dust, and smoke, resulting in additional errors in ambient temperature and failing to accurately reflect the temperature at the center of the coke oven cakes.

[0008] Therefore, the present invention adopts the following technical solution:

[0009] An infrared radiation temperature measuring device for the center of coke cake in a coke oven includes a gas source and several infrared radiation temperature measuring units disposed on both sides of the coke guide grid in a coke quenching car; wherein:

[0010] The infrared radiation temperature measurement unit includes an insulated protective box, inside which is installed an infrared radiation thermometer. The infrared radiation thermometer is connected to a universal joint via an air purger. A viewing tube is provided on the other side of the universal joint. The universal joint is connected to a pressure plate and a mounting plate, respectively. The mounting plate is connected to the insulated protective box.

[0011] Furthermore, the heat insulation protection box is also equipped with a shut-off valve and an air filter pressure reducing valve. The air source is connected to the shut-off valve, the air filter pressure reducing valve, and the air source inlet of the air purger in sequence through the air source pipe.

[0012] Furthermore, the infrared radiation thermometer detects signals and connects them to a programmable logic controller (PLC) via a signal line. The PLC is electrically connected to a wireless router, and the wireless router transmits data to the central control room computer via a gateway.

[0013] Furthermore, the air purger's airflow outlet adopts an internally tangential nozzle, and uses compressed air or industrial nitrogen for continuous purging.

[0014] Furthermore, the viewing tube has a diameter of not less than Ф20 and is provided with external threads.

[0015] The beneficial effects of this utility model are as follows:

[0016] This invention involves installing an air purger in the optical path of an infrared radiation thermometer. The airflow outlet adopts an internally tangential nozzle design, using industrial nitrogen or compressed air for continuous purging. A thermal shield is inserted between the instrument and the target to prevent dust, smoke, and water vapor from adhering to the optical lens. This effectively ensures the accurate measurement of targets that are at high temperatures, near strong magnetic fields, moving, or obstructed by dust, smoke, or other particles in the atmosphere by the dual-color infrared thermometer. It also effectively reduces measurement errors caused by temperature drift due to changes in ambient temperature.

[0017] Meanwhile, this invention can collect the coke cake temperature at each test point in the coke guide trough of the coke quenching car in real time during coke pushing, and bind the temperature measurement data with the fire channel number according to the time sequence of coke discharge; when coke pushing is completed, the data block is bound with the furnace number and transmitted to the relevant computer system of the central control via the inductive wireless data transmission channel, so as to realize the automation of the coke oven heating control system, the automatic generation of coke pushing and coal charging plan, and the real-time curve and chart of coke cake center temperature. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] In the diagram, 1-Infrared radiation thermometer, 2-Air purger, 3-Universal shaft, 4-Inspection tube, 5-Pressure plate, 6-Mounting plate, 7-Insulation protection box, 8-Test hole, 9-Stop valve, 10-Air filter pressure reducing valve, 11-Air source, 12-Programmable logic controller, 13-Wireless router, 14-Signal line, 15-Air source pipe, 16-Second infrared radiation thermometer unit, 17-Third infrared radiation thermometer unit, 18-Fourth infrared radiation thermometer unit, 19-Fifth infrared radiation thermometer unit, 20-Sixth infrared radiation thermometer unit, 21-Coke guide grid, 22-Coke quenching car, 23-Gateway, 24-Central control room computer. Detailed Implementation

[0020] The technical solution of this utility model will be described below with reference to the accompanying drawings and implementation methods. Example

[0021] like Figure 1 As shown, an infrared radiation temperature measuring device for the center of a coke oven cake includes a gas source 11 and a first infrared radiation temperature measuring unit, a second infrared radiation temperature measuring unit 16, a third infrared radiation temperature measuring unit 17, a fourth infrared radiation temperature measuring unit 18, a fifth infrared radiation temperature measuring unit 19, and a sixth infrared radiation temperature measuring unit 20. The first infrared radiation temperature measuring unit has the same structure and working principle as the second infrared radiation temperature measuring unit 16, the third infrared radiation temperature measuring unit 17, the fourth infrared radiation temperature measuring unit 18, the fifth infrared radiation temperature measuring unit 19, and the sixth infrared radiation temperature measuring unit 20. The six units are symmetrically arranged on both sides of the coke guide grid 21 in the coke blocking car 22 and are respectively aligned with the test hole 8.

[0022] The infrared radiation temperature measurement unit includes an insulated protective box 7, inside which is installed an infrared radiation thermometer 1. The infrared radiation thermometer 1 is connected to a universal joint 3 via an air purger 2. Specifically, the air purger 2 adopts an internal tangential nozzle design (1.0mm×60°) and uses compressed air or industrial nitrogen for continuous purging. The purger pressure is 0.17~0.2MPa, forming a shielding air curtain to prevent dust, smoke, and other pollutants in the atmosphere from accumulating on the window of the dual-color infrared thermometer. This effectively ensures accurate measurement of targets that are at high temperatures, near strong magnetic fields, moving, or obstructed by dust, smoke, and other particles in the atmosphere. The universal joint 3 allows the dual-color infrared thermometer to rotate 360°, and the angle between it and the vertical axis is adjustable from 0 to 27°, enabling the dual-color infrared thermometer to aim at the target.

[0023] On the other side of the universal joint 3, there is a viewing tube 4. The universal joint 3 is connected to the clamping plate 5 and the mounting plate 6 respectively. The mounting plate 6 is connected to the heat insulation protection box 7. Specifically, the viewing tube 4 has a diameter of not less than Ф20 and is provided with external threads.

[0024] The thermal insulation enclosure 7 is also equipped with a shut-off valve 9 and an air filter pressure reducing valve 10. The air source 11 is connected sequentially to the shut-off valve 9, the air filter pressure reducing valve 10, and the air source inlet of the air purger 2 via an air source pipe 15. The shut-off valve 9 has a maximum withstand pressure of 1.6 MPa and can be used to cut off the pressure source when repairing or replacing the air filter pressure reducing valve 10. The cooling air must be dry and clean. The air filter pressure reducing valve 10 has a maximum working pressure of 1 MPa, a filtration accuracy of 5 μm, and a pressure adjustment range of 0.1–0.6 MPa. The air filter pressure reducing valve 10 filters particles >5 μm from the nitrogen or compressed air source and reduces the pressure to 0.17–0.2 MPa.

[0025] The infrared radiation thermometer 1 adopts a Raytek dual-color infrared online thermometer with a spectral response range of 0.75~1.10μm / 0.95~1.10μm, a response time of 10ms, and a system accuracy of ±0.75%FS~±1.0%FS (FS is the thermometer's measurement range). The selection of the spectral response range should avoid the characteristic absorption regions of water vapor and CO2 as much as possible. This utility model uses a dual-color infrared radiation thermometer, which is suitable for measuring the temperature of objects that are covered by dust, smoke, and steam. It has strong anti-interference ability in the production site environment and good accuracy over long-term use.

[0026] In use, the infrared radiation thermometer 1 detects signals and connects to the programmable logic controller 12 via signal line 14. The programmable logic controller 12 is electrically connected to the wireless router 13. The wireless router 13 transmits data to the central control room computer 24 via gateway 23, thereby realizing the automation of the coke oven heating control system, the automatic generation of coke pushing and coal charging plans, and the real-time curve and chart of the coke cake center temperature.

Claims

1. A coke oven coke cake center infrared radiation temperature measuring device, characterized in that, It includes a gas source (11) and several infrared radiation temperature measurement units set on both sides of the coke guide grid (21) in the coke quenching car (22); wherein: The infrared radiation temperature measurement unit includes an insulating protective box (7), an infrared radiation thermometer (1) is installed inside the insulating protective box (7), the infrared radiation thermometer (1) is connected to a universal joint (3) through an air purger (2), a viewing tube (4) is provided on the other side of the universal joint (3), the universal joint (3) is connected to a clamping plate (5) and a mounting plate (6) respectively, and the mounting plate (6) is connected to the insulating protective box (7).

2. A device for measuring the temperature of the center of a coke cake in a coke oven, according to claim 1, characterized in that, The heat insulation protection box (7) is also equipped with a shut-off valve (9) and an air filter pressure reducing valve (10). The air source (11) is connected to the shut-off valve (9), the air filter pressure reducing valve (10), and the air source inlet of the air purger (2) in sequence through the air source pipe (15).

3. A device for measuring the temperature of the center of a coke cake in a coke oven, according to claim 1, characterized in that, The infrared radiation thermometer (1) detects signals and is connected to the programmable logic controller (12) via a signal line (14). The programmable logic controller (12) is electrically connected to the wireless router (13). The wireless router (13) transmits data to the central control room computer (24) via a gateway (23).

4. The apparatus for measuring the temperature of the center of the coke cake in a coke oven according to claim 1, wherein The air purger (2) has an internally tangential nozzle at its airflow outlet and uses compressed air or industrial nitrogen for continuous purging.

5. The infrared radiation temperature measuring device for the center of coke oven cake according to claim 1, characterized in that, The viewing tube (4) has a diameter of not less than Ф20 and is provided with external threads.

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