Application of wavelength-scanned wavelength-modulation spectroscopy H2O absorption measurements in an engineering-scale high-pressure coal gasifier

In situ H2O and temperature detection close to burning biomass pellets using calibration-free wavelength modulation spectroscopy

“…CF-WMS systems were successfully employed for temperature and concentration measurements in shock-tubes [26], engines [27], scram-jet combustors in the presence of inhomogeneously distributed temperature and species concentration [28], and in coal-fired high pressure combustion facilities [29]. So far, most implementations of CF-WMS used two lasers to probe and analyze transitions in different wavelength regions, and focused on recovering DAS lineshapes for conventional two-line thermometry via the peak values or integrated absorbances of the absorption lineshapes.…”

Scanned-wavelength-modulation-spectroscopy sensor for CO, CO2, CH4 and H2O in a high-pressure engineering-scale transport-reactor coal gasifier

“…In the past two years, a new paradigm for the acquisition and analysis of wavelength-scanned WMS has been developed [33,34]. This new method has been used previously for water vapor measurements in the syngas of the NCCC gasifier [18] and in a scramjet combustor [35] where the wavelength-scanned 1f-nromalized WMS-2f signals are fit with only the line shape and the peak absorbance as free parameters. One of the key advantages of measuring these four species simultaneously is that the mixture composition becomes essentially known from such measurement.…”

“…2A 2012 campaign to Utah used a secondgeneration sensor for CO, CH 4 , CO 2 , and H 2 O in-situ syngas measurements [17]. 3A 2012/2013 campaign performed H 2 O and temperature measurements in syngas from an engineering-scale fluidized bed transfer gasifier at the National Carbon Capture Center (NCCC) [18]. These H 2 O measurements were the first-ever in situ laser-absorption measurements in the industrial-scale NCCC gasifier product stream.…”

Laser absorption spectroscopy for combustion diagnosis in reactive flows: A review

“…The use of M I 0 (t) for simulation not only avoids characterizing the complex analytic model of laser intensity in its response to scanning and modulating the injection-current, but also accounts for any wavelength-dependent transmission of other optical components in the apparatus. Furthermore, the availability of this method with any optical depth and modulation index make it an attractive strategy for combustion diagnosis in harsh environments such as shock tubes (109), scramjet combustors (110,111), detonation engines (50) and coal gasifiers (112)(113)(114). A comparison of various scanned-wavelength LOS LAS techniques is presented in Table 3 to clearly show their benefits and limitations.…”