A temperature detection method of hot air pipe based on distributed optical fiber

A distributed optical fiber and detection method technology, which is applied in the direction of physical/chemical change thermometers, thermometers, measuring devices, etc., can solve the problems of poor component compatibility, poor optical fiber interchangeability, etc., to improve service life, improve adaptability, The effect of reducing the focal ratio

Active Publication Date: 2017-12-08
马鞍山市安工大智能装备技术研究院有限公司
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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.

Method used

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  • A temperature detection method of hot air pipe based on distributed optical fiber
  • A temperature detection method of hot air pipe based on distributed optical fiber
  • A temperature detection method of hot air pipe based on distributed optical fiber

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Embodiment 1

[0041] combine figure 2 , a distributed fiber-based hot air pipe temperature detection system in this embodiment includes a distributed optical fiber sensor and a distributed optical fiber, and the distributed optical fiber is wound on the hot air pipe; the distributed optical fiber sensor includes a laser emission source , pulse drive circuit, optical fiber coupler, optical path selection switch, 2 optical filters, 3 photodetectors, high-speed comparison amplifier, frequency discriminator, high-speed data acquisition card and DSP unit; the DSP unit controls laser emission through the pulse drive circuit The source emits laser light and sends it to the fiber coupler; the fiber coupler is electrically connected to the optical path selection switch, and the beginning and end of the distributed optical fiber are connected to the optical path selection switch; the output end of the fiber coupler is also connected to the first optical filter device, the second optical filter and the...

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Abstract

The invention discloses a method for detecting the temperature of a hot air pipe based on a distributed optical fiber, and belongs to the technical field of temperature detection of a blast furnace hot air pipe. The invention includes a distributed optical fiber sensor and a distributed optical fiber. The distributed optical fiber is wound on the hot air pipe; the distributed optical fiber sensor receives the backscattering signal generated by the distributed optical fiber, and uses the Rayleigh frequency tracking method to track the light source emitted by the laser emission source. Center frequency compensation; at the same time, demodulate the received signal through double-ended single-channel demodulation method, extract the temperature value of each measurement point on the distributed optical fiber, and send it to the processor to compensate and correct the temperature data. The invention measures the surface temperature at multiple points through the distributed optical fiber surrounding the surface of the hot air pipe, and uses the Rayleigh frequency tracking method to compensate the center frequency drift of the light source. The temperature measurement result can truly reflect the surface temperature of the hot air pipe, which helps to improve Extend the service life of the hot air pipe, improve the productivity of the blast furnace, and prevent the hot air pipe from burning through.

Description

technical field [0001] The invention belongs to the technical field of blast furnace hot air pipe temperature detection, in particular to a detection 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 red. For a long time, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32C21B7/24
Inventor 方挺欧阳强强张建军
Owner 马鞍山市安工大智能装备技术研究院有限公司
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