Distributed optical fiber-based blast furnace hot blast stove temperature monitoring system and method

Abstract

The invention discloses a distributed optical fiber-based blast furnace hot blast stove temperature monitoring system and method and belongs to the technical field of hot blast stove temperature detection. According to the distributed optical fiber-based blast furnace hot blast stove temperature monitoring system and method, a distributed optical fiber transversely winds the top part of a hot blast stove, both the starting end and end of the distributed optical fiber are connected with a distributed optical fiber sensor, the distributed optical fiber sensor is connected with an ARM processor, the distributed optical fiber sensor receives back scattering signals generated by the optical fiber, a novel temperature signal demodulation method is used, the temperature value of each measuring point on the optical fiber is extracted through a double-end single-way demodulation method, and the temperature value of each measuring point is sent to the ARM processor; the ARM processor is connected with an upper computer through an industrial Ethernet interface. According to the distributed optical fiber-based blast furnace hot blast stove temperature monitoring system and method, the surface temperature of the hot blast stove is performed with multi-point measurement through the distributed optical fiber, because the optical fiber directly and firmly contacts with a hot blast stove shell, the temperature measurement result is capable of reflecting the real temperature of the hot blast stove body; the distributed optical fiber-based blast furnace hot blast stove temperature monitoring system and method are convenient for early forecasting the stove shell damage situation and good for improving the service life of the hot blast stove, lowering the coke ratio and improving the blast furnace production rate.

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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