A blast furnace tuyere combustion temperature monitoring device

Abstract

This invention relates to the field of blast furnace ironmaking technology and discloses a blast furnace tuyere combustion temperature monitoring device to solve the problem of discrepancies between existing theoretical combustion temperature calculations and actual values. The device includes a tuyere combustion temperature monitoring probe and an industrial control computer. The probe incorporates a coaxial optical video sensor and a temperature sensor, and uses a beam splitter to divide the reflected light from the target into two paths: one path is used for sensor measurement, and the other path passes through a reflector and enters the eyepiece. The probe's front end is equipped with a quick-connect sleeve to fix it to the tuyere viewing hole. This invention achieves "what you see is what you measure" through eyepiece and beam splitting adjustment, effectively avoiding interference from the spray gun and unburned particles. Combined with dual infrared colorimetric temperature measurement technology, it achieves accurate, real-time online monitoring of the actual combustion temperature at the tuyere, providing reliable data support for refined blast furnace operation and the injection of new materials such as hydrogen-rich gas.

Description

Technical Field

[0001] This invention relates to the field of blast furnace ironmaking technology, specifically a blast furnace tuyeres combustion temperature monitoring device. Background Technology

[0002] In blast furnace ironmaking, the theoretical combustion temperature at the tuyere is a key indicator of blast furnace production, a core indicator of hearth heat input, and affects the smooth operation of the blast furnace and gas utilization. For example, an excessively high theoretical combustion temperature can lead to hearth overheating and gas volume expansion, potentially disrupting gas flow distribution and causing problems with pipelines and suspended materials. Conversely, an excessively low theoretical combustion temperature indicates insufficient heat supply, which may result in low slag-iron temperature, furnace cooling, and slagging at the tuyere. Based on this, ironmaking experts have often proposed the concept of "constant theoretical combustion operation," which has been implemented by some advanced steel plants.

[0003] Currently, the theoretical combustion temperature of tuyeres is basically calculated using theoretical formulas. However, the theoretical combustion temperature of tuyeres is affected by many factors, such as oxygen enrichment rate, pulverized coal injection rate, blast temperature, and blast moisture content. These factors are constantly changing in real-time during actual production, and theoretical calculations alone cannot fully reflect the actual situation inside the furnace. This is undoubtedly a technical pain point that urgently needs to be addressed for the increasingly demanding precision operation of blast furnaces.

[0004] Furthermore, for mainstream pulverized coal injection blast furnaces, current operations are primarily guided by "calculated theoretical combustion temperature at the tuyere plus the blast furnace foreman's experience." The development and testing of hydrogen-rich gas injection (such as coke oven gas, natural gas, and hydrogen) are ongoing. The application experience of theoretical combustion temperature indicators at the tuyere obtained from traditional pulverized coal injection blast furnaces may not be applicable to hydrogen-rich gas injection or mixed injection, and the theoretical calculation formulas for multiple material injections have not been validated through long-term actual operation.

[0005] Therefore, there is an urgent need for an online monitoring device for the combustion temperature of blast furnace tuyeres. This device would be used to monitor the actual combustion temperature of the blast furnace tuyeres in real time and accurately. On the one hand, it would monitor the changing trend of the actual combustion temperature to guide the refined operation of the blast furnace; on the other hand, it would assist operators and R&D personnel in identifying the differences between the theoretical calculations and actual combustion temperatures of the same material being injected, as well as the parameter changes when different materials are injected, thereby contributing to the research and verification of new ironmaking technologies such as hydrogen-rich gas injection. Summary of the Invention

[0006] The purpose of this invention is to provide a blast furnace tuyere combustion temperature monitoring device, which aims to solve the problems in the prior art where the theoretical combustion temperature of the tuyere deviates from the actual operating conditions, and where traditional temperature measuring equipment is difficult to accurately measure the temperature in harsh environments without the interference of particulate matter.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A blast furnace tuyere combustion temperature monitoring device includes a tuyere combustion temperature monitoring probe and an industrial control computer. The tuyere combustion temperature monitoring probe integrates a video sensor, a temperature sensor, a beam splitter, and a reflector, and also features an eyepiece and a quick-connect sleeve. The industrial control computer includes an image acquisition card, an RS485 serial port, and dedicated software.

[0008] As a further aspect of this invention, the combustion temperature monitoring probe at the vent incorporates a dual infrared colorimetric thermometer. By detecting the infrared radiation energy of two adjacent wavelengths of the target, the ratio of the two wavelengths' radiation energy is calculated to deduce the target temperature. This technical solution effectively eliminates the influence of changes in the emissivity of the combustion flame and the interference from particulate media (such as coal dust) penetrating the vent, accurately obtaining the actual combustion temperature of the medium inside the vent, and transmitting the real-time monitored temperature signal to the industrial control computer.

[0009] As a further aspect of the present invention: the built-in video sensor of the vent combustion temperature monitoring probe is an analog video image sensor, which has advantages such as stable operation and resistance to harsh environments. It can be used in the harsh environment of high temperature and high dust on the vent platform, and overcomes the stuttering phenomenon that is easily caused by digital images. The optical center of the video sensor is coaxially set with the optical center of the temperature sensor to ensure that the center of the video image is the actual temperature measurement target.

[0010] As a further aspect of the present invention: the beam splitter built into the vent combustion temperature monitoring probe splits the target reflected light into two paths, one for temperature measurement and video monitoring, and the other for output to the eyepiece via a reflector, allowing on-site operators to manually adjust and align it with the target. The beam splitter has an angle adjustment mechanism, which allows for fine-tuning of the angle to ensure that the image observed by the eyepiece is completely consistent with the image acquired by the video sensor (i.e., "what you see is what you measure").

[0011] As a further aspect of the invention: the front end of the tuyere combustion temperature monitoring probe is equipped with a quick-connect sleeve for quickly fixing the probe to the tuyere inspection hole nut. The quick-connect sleeve has a three-jaw fixing structure, which allows for quick on-site fixing and disassembly; furthermore, due to the three-point contact fixing, it greatly reduces the heat conduction area between the equipment and the high-temperature furnace body, lowering the operating temperature of the monitoring probe and ensuring stable operation; in addition, this three-jaw structure also allows for convenient adjustment of the measurement target angle, accurately avoiding the tuyere spray gun and unburned coal powder areas, preventing measurement distortion.

[0012] As a further aspect of the present invention: the industrial control computer converts the acquired analog video signal into a digital signal through an image acquisition card, acquires the temperature signal through a 485 serial port, and performs secondary filtering and data processing through dedicated software. Finally, the on-site video, real-time temperature and historical trend curve are displayed synchronously on the interactive interface, and the data is automatically stored for future reference.

[0013] Compared with the prior art, the beneficial effects of the present invention are: (1) Accurate temperature measurement and anti-interference: The optical coaxiality of the monitoring target temperature and the video is adjustable and the beam splitting is adjustable, realizing "what you see is what you measure". With the angle fine adjustment function of the three-claw structure, it can effectively avoid the spray gun and unburned particles; combined with dual infrared colorimetric technology, it completely eliminates the interference of environmental emissivity.

[0014] (2) Simple installation and easy maintenance: The three-jaw quick connection sleeve not only enables quick installation and removal, but also the three-point fixation greatly reduces heat conduction and improves the service life of the precision probe in the high temperature environment of the air outlet.

[0015] (3) Production guidance: Real-time monitoring of the actual combustion temperature at the tuyere can more intuitively and effectively guide the blast furnace foreman to adjust parameters such as air volume and oxygen enrichment, which is conducive to the smooth operation of the blast furnace and energy conservation and emission reduction.

[0016] (4) Promote the verification of theory and new technologies: Understand the difference between the actual combustion temperature and the theoretical combustion temperature at the tuyere; in particular, understand the changes in the actual combustion temperature when different materials such as pulverized coal or hydrogen-rich gas are injected, which provides key data support for evaluating the actual impact of hydrogen-rich gas injection on the blast furnace. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the system structure of a blast furnace tuyeres combustion temperature monitoring device.

[0019] Figure 2 This is the software interface of a blast furnace tuyeres combustion temperature monitoring device applied to a blast furnace.

[0020] Explanation of reference numerals in the attached figures: 1-Industrial control computer; 2-Air outlet combustion temperature monitoring probe; 3-Video sensor; 4-Temperature sensor; 5-Beam splitter; 6-Eyepiece; 7-Reflector; 8-Quick connection sleeve. Detailed Implementation

[0021] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "configuration" should be interpreted broadly. For example, they can refer to a fixed connection or configuration, a detachable connection or configuration, or an integral connection or configuration. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0024] A blast furnace tuyere combustion temperature monitoring device, such as Figure 1 As shown, it includes an industrial control computer 1 and an air vent combustion temperature monitoring probe 2.

[0025] The air vent combustion temperature monitoring probe 2 contains, in sequence, a video sensor 3, a temperature sensor 4, a beam splitter 5, an eyepiece 6, and a reflector 7, and is connected to a quick-connect sleeve 8 at the external front end.

[0026] In terms of optical path design, light from the target area enters through the front end of the probe and is split into two paths after encountering the beam splitter 5. The transmitted light path projects onto the optically coaxial video sensor 3 and temperature sensor 4 (dual infrared colorimetric thermometer) for data acquisition; the reflected light path is refracted by the reflector 7 and enters the eyepiece 6. The operator can directly observe the situation inside the furnace through the eyepiece 6 and ensure that the center of the eyepiece's field of view coincides with the sensor's detection center by adjusting the angle of the beam splitter 5.

[0027] In terms of electrical connection and transmission, the tuyere combustion temperature monitoring probe 2 is powered by the blast furnace on-site distribution box. The power supply and signal lines are quickly plugged into and unplugged by the probe via high-temperature resistant aviation plugs. To resist on-site electromagnetic interference and achieve long-distance transmission, the distribution box is equipped with photoelectric conversion modules such as optical modems and optical transceivers, which convert the signal into an optical signal and transmit it to the industrial control computer 1 in the main control room.

[0028] The device in this embodiment enables accurate online monitoring of the combustion temperature at the blast furnace tuyeres and can be stably applied in industrial production over a long period of time.

[0029] When using the monitoring device of the present invention to monitor the temperature of the blast furnace tuyeres, the specific operating steps include: Step 1: Select a location on the blast furnace tuyeres platform with suitable temperature and convenient wiring to install the on-site distribution box; Step 2: Connect the tuyere combustion temperature monitoring probe 2 to the tuyere inspection hole nut. The operator observes through the eyepiece 6 on the probe, and adjusts the quick-connect sleeve 8 of the three-jaw structure to effectively avoid the tuyere spray gun and the sprayed unburned coal powder particles, aligning it with the pure combustion swirling zone. Then tighten the three fixing bolts of the quick-connect sleeve 8 to complete the installation. Step 3: Connect the field distribution box to the air vent combustion temperature monitoring probe 2 using a quick-connect cable with an aviation plug; Step 4: The distribution box connects the photoelectric converted temperature and video signals to the industrial control computer 1 in the main control room. The industrial control computer 1 uses built-in dedicated software to perform secondary filtering and fusion of the digital video signal and the 485 temperature signal, ultimately displaying the real-time on-site video, the current actual combustion temperature value, and historical trend curves (such as...) on the screen. Figure 2 (As shown).

[0030] It should be noted that the present invention is a blast furnace tuyeres combustion temperature monitoring device. All components are general standard parts or parts known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0031] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A blast furnace tuyere combustion temperature monitoring device, characterized in that, Includes an air vent combustion temperature monitoring probe (2) and an industrial control computer (1); The tuyere combustion temperature monitoring probe (2) is equipped with a video sensor (3), a temperature sensor (4), a beam splitter (5), a reflector (7) and an eyepiece (6) inside. Its front end is equipped with a quick-connect sleeve (8) for fixing to the blast furnace tuyere inspection hole. The video sensor (3) and the temperature sensor (4) are arranged coaxially at their optical centers; The beam splitter (5) is set on the optical path of the probe to split the light signal from the target area into two. One path is transmitted to the video sensor (3) and the temperature sensor (4) for measurement, and the other path is reflected to the reflector (7) and finally enters the eyepiece (6) for on-site personnel to visually adjust and align the monitoring target. The air vent combustion temperature monitoring probe (2) is connected to the industrial control computer (1) and transmits the collected temperature signal and video signal to the industrial control computer (1) in real time for data processing and interface display.

2. The blast furnace tuyeres combustion temperature monitoring device according to claim 1, characterized in that: The temperature sensor (4) is a dual infrared colorimetric temperature sensor. By detecting the infrared radiation energy of two adjacent wavelengths of the target and calculating the ratio of the radiation energy of the two bands, the actual combustion temperature of the medium inside the air vent can be deduced.

3. The blast furnace tuyeres combustion temperature monitoring device according to claim 1, characterized in that: The video sensor (3) is an analog video image sensor used to output continuous analog video signals in real time under harsh environments.

4. The blast furnace tuyeres combustion temperature monitoring device according to claim 1, characterized in that: The beam splitter (5) has an angle adjustment mechanism. By adjusting the tilt angle of the beam splitter (5), the center of the image observed through the eyepiece (6) is completely consistent with the center of the image acquired by the video sensor (3).

5. The blast furnace tuyeres combustion temperature monitoring device according to claim 1, characterized in that: The quick-connect sleeve (8) is a three-jaw fixing structure, which is fixed to the nut of the blast furnace tuyeres inspection hole through three fixed support points, and supports the fine adjustment of the measurement target angle of the probe in the fixed state.

6. A blast furnace tuyeres combustion temperature monitoring device according to any one of claims 1 to 5, characterized in that: The industrial computer (1) has a built-in image acquisition card and an RS485 serial communication module; the image acquisition card is used to convert the analog video signal from the video sensor (3) into a digital image signal, and the RS485 serial communication module is used to acquire the temperature signal from the temperature sensor (4).

7. The blast furnace tuyeres combustion temperature monitoring device according to claim 6, characterized in that: The industrial control computer (1) runs dedicated monitoring software, which is equipped with secondary filtering and data processing algorithms to synchronously display video images, real-time temperature and temperature change trend curves on the software interface and store data.

8. The blast furnace tuyeres combustion temperature monitoring device according to claim 1, characterized in that: The device also includes a field power distribution box, which is equipped with a photoelectric conversion module; the power line and signal line of the air outlet combustion temperature monitoring probe (2) are quickly connected to the field power distribution box through an aviation plug, and the signal is remotely transmitted to the industrial control computer (1) through the photoelectric conversion module.

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