A temperature monitoring method of blast furnace hot blast stove based on distributed optical fiber

Abstract

The invention discloses a distributed optical fiber-based blast furnace hot blast stove temperature monitoring system and method, belonging to the technical field of hot blast stove temperature detection. In the present invention, the distributed optical fiber is horizontally wound on the top of the hot blast stove, the beginning and the end of the distributed optical fiber are connected to the distributed optical fiber sensor, the distributed optical fiber sensor is connected to the ARM processor, and the distributed optical fiber sensor receives the back-facing signal generated by the optical fiber. The scattered signal adopts a new temperature signal demodulation method: the double-ended single-channel demodulation method extracts the temperature value of each measurement point on the optical fiber and sends it to the ARM processor; the ARM processor is connected to the host computer through an industrial Ethernet interface. The invention uses distributed optical fibers to measure the surface temperature of the hot blast stove at multiple points. Since the optical fiber is directly in close contact with the hot blast stove shell, the temperature measurement result can reflect the real temperature of the hot blast stove body, which is convenient for early prediction of the damage of the furnace shell. It helps to increase the service life of the hot blast stove, reduce the coke ratio, and increase the productivity of the blast furnace.

Description

technical field [0001] The invention belongs to the technical field of blast furnace hot blast stove temperature detection, and in particular to a monitoring system and method based on distributed optical fiber sensing technology and hot blast stove temperature detection technology, which mainly completes the temperature signal measurement and transmission of blast furnace hot blast stove body. Background technique [0002] With the advancement of my country's energy saving and emission reduction policies and the acceleration of the elimination of backward production capacity, the large-scale blast furnace and the improvement of smelting intensity are the main trends in the development of modern blast furnaces. The hot blast stove is the equipment for blast furnace heating and blasting, which is indispensable for modern blast furnaces An important part of. According to the regenerator inside the hot blast stove, the spherical hot blast stove and the hot blast stove using chec...

AI Technical Summary

Problems solved by technology

The blast furnace hot blast stove is located near the blast furnace body, the air dust concentration is high and the dust concentration changes with the weather, the objective lens is easily covered by dust and cannot be measured accurately

Therefore, the result of monitoring the thermal state of the hot blast stove body by infrared thermal imaging method is inaccurate, which may cause misdiagnosis

[0006] (2) High cost of measurement: Generally, a blast furnace is equipped with 3 to 4 hot blast stoves and the blast furnace hot blast stove is huge (more than 1000 cubic meters), so it is necessary to use a high-resolution infrared thermal imager. This type of infrared thermal imager machine The core is expensive. The market price of only a 640×480 FILR infrared uncooled focal plane core T610 is as high as 30,000 US dollars. In addition to the supporting distributed optical fiber sensors, embedded devices, and host computers, all costs plus It is nearly 300,000 yuan. Such a high cost is not conducive to the promotion of infrared thermal imaging temperature measurement technology.

[0007] (3) Unable to measure online: The blast furnace hot blast stove is located near the blast furnace body, in an environment with strong magnetic fields, corrosive gases, and high dust concentrations, and is exposed to the sun and rain for a long time

The application can continuously measure the shell temperature of the blast furnace hot blast stove, but the application has: 1) serious distortion in the long-distance temperature measurement area of ​​the optical fiber, and poor measurement stability; 2) poor interchangeability of the optical fiber; 3) external ambient temperature, air convection, The area of ​​the hot blast stove and the thermal conductivity of the hot blast stove wall are likely to affect the measurement results and other issues, which still need further improvement

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