System and method for detecting temperature of hot air pipe based on distributed optical fiber

Abstract

The invention discloses a system and a method for detecting the temperature of a hot air pipe based on a distributed optical fiber, and belongs to the technical field of blast furnace hot air pipe temperature detection. The system comprises a distributed optical fiber sensor and a distributed optical fiber, and is characterized in that the distributed optical fiber is wound on the hot air pipe; the distributed optical fiber sensor receives backscattering signals generated by the distributed optical fiber, and center frequency compensation is carried out on a light source given out by a laser emission source through a Rayleigh frequency tracking method; and meanwhile, demodulation is carried out on the received signals through a double-end single-way demodulation method, a temperature value of each measurement point on the distributed optical fiber is extracted, and the extracted temperature values are transmitted to a processor so as to carry out compensation and correction on temperature data. According to the invention, multi-point measurement is carried out on the surface temperature of the hot air pipe through the distributed optical fiber wound at the surface of the hot air pipe, center frequency drift of the light source is compensated by adopting the Rayleigh frequency tracking method, and a temperature measurement result can truly reflect the surface temperature of the hot air pipe, thereby being conducive to prolonging the service life of the hot air pipe, improving the productivity of the blast furnace, and preventing the hot air pipe of the blast furnace from being burnt through.

Description

technical field [0001] The invention belongs to the technical field of blast furnace hot air pipe temperature detection, and in particular relates to a detection system and method which integrates distributed optical fiber sensing technology and temperature detection technology and mainly completes the measurement and transmission of the temperature signal of the blast furnace hot air pipe furnace body. Background technique [0002] With the advancement of my country's energy-saving and emission-reduction policies, in order to optimize the production process of steel mills, it is an obvious trend to increase the size of blast furnaces. The hot blast stove is a device for heating and blasting blast furnace ironmaking, and is one of the important equipment in the ironmaking production process. Among them, the connection part between the hot blast pipe and the hot blast stove, and the connection part with the hot blast main pipe are easy to drop bricks and burn the tube shell r...

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Problems solved by technology

Therefore, the temperature compensation method has the disadvantages of poor optical fiber interchangeability and poor component compatibility.

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