Alkalis atomic emission spectroscopy and flame temperature measurement of diesel impinging flames in an opposed multi-burner gasifier

Analysis of the Single Coal Particle Combustion Process under O2/CO2 Atmosphere Based on Spectral Diagnostics Technology: Combination of Spectroscopic Characteristics and Flame Temperature

“…The optical apparatus consists of an ultraviolet (UV) imaging system (EX-4710B, Isuzu Optics Corp.), a hyperspectral imaging device (HIS-VNIR-OWL1000, Isuzu Optics Corp.), and a high-speed camera (pco.dimax S1, pco.). The UV imaging system includes a 1056 × 1027 pixel UV camera combined with a narrow bandpass filter (310 and 430 nm with a full width at half-maximum (fwhm) of 10 nm); this is a suitable setup as the primary emissions of the OH* and CH* chemiluminescence are produced at the 310 and 430 nm bands, respectively . The single coal particle images are captured by the hyperspectral imaging system, which has a response spectrum of 400–1000 nm and captures an image size of 1024 × 520 pixels.…”

“…The experimental conditions are listed in Table . The coal flow rate was set at 1.5 g/min, and the global equivalence ratio O/C (mol·mol –1 ) was calculated as follows: where m O 2 / m coal represents the mass ratio for the gas flow rate of coal and oxygen. ( m O 2 / m coal ) st denotes the mass ratio where coal is completely consumed.…”

“…The UV imaging system includes a 1056 × 1027 pixel UV camera combined with a narrow bandpass filter (310 and 430 nm with a full width at half-maximum (fwhm) of 10 nm); this is a suitable setup as the primary emissions of the OH* and CH* chemiluminescence are produced at the 310 and 430 nm bands, respectively. 32 The single coal particle images are captured by the hyperspectral imaging system, which has a response spectrum of 400−1000 nm and captures an image size of 1024 × 520 pixels. The spectral resolution is 2 nm (fwhm), and the exposure time is set to 10 ms. A high-speed camera was fitted with an AF Zoom-Nikon lens (24−85 mm G/2.8-4D) to provide high definition flame images during the coal particle combustion process.…”

“…Li used CO 2 laser ignition and flame spontaneous emission spectroscopy to explore the spatial and temporal distribution of alkali metals (K and Na) during the coal fuel combustion; they analyzed the influence of the oxygen concentration on the release of alkali metals. Hu studied alkali atomic emission spectroscopy using a change-coupled-device (CCD) camera combined with multiple bandpass filters and found that the spectral emission of alkali metals depends strongly on the flame temperature. Despite the extensive research on the volatile combustion of coal, the chemiluminescence characteristics of the continuous coal combustion process have not yet been systematically investigated until now.…”

“…Li 31 used CO 2 laser ignition and flame spontaneous emission spectroscopy to explore the spatial and temporal distribution of alkali metals (K and Na) during the coal fuel combustion; they analyzed the influence of the oxygen concentration on the release of alkali metals. Hu 32 studied alkali atomic emission spectroscopy using a change- This work studies the volatile flame and volatile−char flame characteristics of a single coal particle with different oxygen fractions (X i,O 2 ) in an O 2 /CO 2 atmosphere. The experiments were carried out in a visual drop tube furnace (VDTF), and the spectroscopy diagnostic technique and flame radiation spectrum were used to determine the chemiluminescence characteristics of OH*, CH*, Na*, and K* as well as the flame temperature.…”