Imaging Combustion Temperature Concentration Measurement Device Based on Dual-channel Molecular Filtering

Abstract

The invention provides an imaging-type combustion temperature and concentration measurement device based on dual-channel molecule optical filtering. The invention discloses an imaging-type combustion measurement device based on a dual-channel molecule optical filtering technology, and the device relates to measurement of combustion temperatures and concentrations. The device is composed of an optical receiving unit (1), a total beam separation lens (2), a first channel molecule optical filtering imaging detection assembly (3), a second channel molecule optical filtering imaging detection assembly (4) and a data processing and image display unit (5). A dual-channel molecule optical filtering unit is composed of the two sets of molecule optical filtering assemblies which are separately used to acquire two groups of radiation spectrums with different temperature sensitivity coefficients and used for inversion of combustion filed temperatures and component concentrations. The device disclosed by the invention has the advantages that an imaging-type combustion diagnosis device based on the dual-channel molecule optical filtering technology is capable of hyper-spectral resolution, hyper-time resolution, hyper-space resolution and non-contact online measurement, so that the imaging-type combustion temperature and concentration measurement device based on the dual-channel molecule optical filtering disclosed by the invention has the advantages of high measurement accuracy, high stability and reliability in work, high resistance to interference, and a capability of simultaneously obtaining a CO concentration and temperature in a combustion area, etc.

Description

technical field [0001] The invention relates to the measurement of combustion temperature concentration, in particular to an imaging type combustion diagnosis device with ultra-narrow band molecular light filtering. Background technique [0002] The rapid development of the national economy requires more and more energy. At present, about 80% of the world's energy supply is generated by combustion. Therefore, achieving high-efficiency heat conversion in the combustion process is of great significance for energy conservation and environmental protection. Studies have shown that the flame structure, temperature, component concentration and other combustion parameters in the combustion zone are closely related to the working conditions, combustion efficiency, and combustion products (including pollutant emissions) of the combustion system. Combustion diagnosis technology, especially non-contact optical diagnosis technology that can obtain combustion parameters such as temperatu...

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Problems solved by technology

The literature ("Development of Two-Color Thermometer Using a Color CCD Camera and Measurement Technology of Tuyere and Raceway of Blast Furnace", Tetsu to hagane-journal of the Ironand Steel Institute of Japan, 2013, 99(5):10-17) uses two-color The thermal radiation image data of the combustion area is collected by the pyrometer and the color CCD camera, and the temperature distribution of the combustion area is obtained by inversion using the direct functional relationship between the total energy of the black body radiation and its thermodynamic temperature. The measured area is assumed to be a gray body, which leads to a large error between the temperature inversion results and the actual situation; literature ("Mid-IR hyperspectral imaging of laminar flames for 2-D scalar values", Optics Express, 2014, 22(18): 21600 –21617) uses Fourier transform infrared imaging spectrometer for combustion diagnosis, obtains the spectral information of the flame by collecting the interference image of the combustion area and performs Fourier transform, and inverts the combustion parameters such as temperature and component concentration. This method will image The combination of technology and spectral technology can not only directly obtain the flame structure of the combustion area, but also identify the combustion products according to the characteristic spectrum and measure the product concentration and combustion temperature through correction. However, due to the complex structure of the imaging spectrometer, optical scanning is required to make it optically stable. Therefore, the combustion diagnosis technology based on Fourier transform infrared imaging spectrometer has many engineering difficulties in industrial field application; literature ("Raman / Rayleigh scattering and CO-LIF measurements in laminar and turboentjet flames of dimethyl ether”, Combustion and Flame, 2012, 159(8): 2533–2562) using Rayleigh scattering, Raman scattering and The laser-induced fluorescence effect can obtain the flow field information in the combustion area, the Rayleigh scattering effect can obtain temperature and velocity information, the Raman scattering effect can obtain concentration and temperature information, and the laser-induced fluorescence effect can obtain component concentration information. , laser light scattering technology has many advantages, such as non-contact measurement to reduce or avoid pneumatic, thermal or chemical disturbance, can withstand high temperature and harsh environment, has a certain time and Spatial resolution can obtain flow field information such as temperature and component concentration, but this technology also has great limitations, mainly because the interference of strong background light in the combustion area, laser-induced effects and laser stray scattering is difficult to avoid, and the system complex, expensive equipment

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