TDLAS boiler gas two-dimensional concentration distribution detecting method and device based on automatic scanning system

Abstract

A method for detecting the two-dimensional concentration distribution of gas in a TDLAS boiler furnace based on an automatic scanning system: install transmitting units at the four corners of the boiler furnace section detection platform; install multiple receiving units on each of the four sides of the detection platform; use the control module to make the transmitting and receiving units Respectively rotate according to the preset method. When the laser beam rotates to scan the internal section of the furnace, the laser beam and the receiving units scanned by the laser beam are in turn facing each other, so that each receiving unit sequentially completes the reception of the laser transmission signal and converts it into an electrical signal. ; The collected analog signal is converted into a digital signal through the data acquisition card and output to the computer, and the two-dimensional concentration distribution of the gas to be measured in the scanning area is calculated by inversion through the image reconstruction algorithm; the detection device includes: a laser output unit, a transmitting and receiving unit and Data acquisition and processing unit. The invention can accurately detect the concentration distribution of gas products in the cross-section of the boiler furnace in real time, effectively improves the reconstruction quality of the two-dimensional distribution of the gas concentration, and reduces the detection cost.

Description

technical field [0001] The invention relates to the technical field of gas concentration detection, in particular to a method and device for detecting gas two-dimensional concentration distribution in a boiler furnace using TDLAS based on an automatic scanning system. Background technique [0002] The on-line measurement of product concentration and distribution of combustion gas in controllable combustion spaces such as power plant boilers is of great significance for realizing combustion optimization, improving combustion efficiency and flame quality, and reducing pollutant emissions. Tunable Laser Absorption Spectroscopy (TDLAS) is an emerging spectroscopic measurement technology for gas components. With its high spectral resolution, high accuracy, fast response speed, high sensitivity and low interference from other gases, it has become an Effective monitoring means for gas, industrial air leakage, high-temperature and high-speed exhaust gas, etc. [0003] Theory and pr...

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Problems solved by technology

[0003] Theory and practice have proved that it is feasible to apply TDLAS technology combined with tomography technology to the two-dimensional distribution detection of gas component concentration field in power plant boilers, and a large number of simulation results and experimental data have verified that the more light paths passing through the area to be measured, The better the reconstr

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