A Modeling Method for Blast Furnace Hot Stove Lining Erosion Based on Distributed Optical Fiber

Abstract

The invention discloses a modeling method for lining erosion of blast furnace hot blast stoves based on distributed optical fibers, and belongs to the technical field of modeling erosion of hot blast stove linings. In the present invention, the distributed optical fiber is horizontally wound on the top of the hot blast stove, and the start and end of the distributed optical fiber are connected to the distributed optical fiber sensor. The distributed optical fiber sensor adopts a double-end single-path demodulation method to extract the temperature field along the optical fiber path. The erosion model solving unit uses the finite element method to solve the actual shape and size of the inner boundary of the hot blast stove body; in the process of solving, the virtual adiabatic inner and outer boundary correction method is used to deal with the boundary problem of the hot blast stove lining erosion model and quantitatively calculate the hot blast stove lining Erosion status: The virtual adiabatic internal and external boundary correction method makes the erosion model not only suitable for the hot blast stove at the beginning of the furnace, but also for the hot blast stove that has been put into production, and can even be extended to the relevant monitoring fields of the hearth bottom of the blast furnace, which greatly improves The scope of application of the erosion model is widened, which provides a guarantee for the safe production of blast furnaces.

Description

Technical field [0001] The invention belongs to the technical field of lining erosion modeling of blast furnace hot blast furnaces, and is particularly based on distributed optical fiber temperature sensing technology and hot blast furnace lining and furnace shell heat transfer modeling technology, and mainly completes the establishment of blast furnace hot blast furnace lining erosion models. Background technique [0002] With the promotion 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. Hot blast furnaces are one of the main auxiliary equipment of blast furnaces. It heats up the blast (about 180°C) sent by the blower (heated to 1200°C to 1250°C), and supplies it to the blast furnace stably and continuously according to the required air temperature of the blas...

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 concentration changes with the weather, the objective lens will be blocked by the 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

[0005] (2) High cost: 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 choose an expensive high-resolution infrared thermal imager core, only one 640× The market price of the 480 FILR infrared uncooled focal plane core T610 is as high as 30,000 US dollars, plus the supporting distributed optical fiber sensor, embedded equipment and host computer, etc., all the costs add up to nearly 300,000 yuan, so expensive The cost is very unfavorable to the promotion and use of this technology

[0006] (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 the exact temperature before the convective heat exchange between the furnace shell and the outside air cannot be calculated, and further improvement is still needed

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