Influence of Carbonate Decomposition on Normal Spectral Radiative Emittance in the Context of Oxyfuel Combustion

Gorewoda, Jeanette; Scherer, Viktor

doi:10.1021/acs.energyfuels.6b01398

Cited by 17 publications

(14 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The arithmetic means and the medians are larger for the Fe 2 O 3 -HTC char in the NIR region, which fits to the spectral dependencies described previously. However, the interquartile range and, consequently, the variation are also The larger emissivity of the Fe 2 O 3 -HTC char fits previous results of Gorewoda and Scherer [26] for synthetic coal ash. They found that the total (and below 8 mm, also the spectral) emissivity of Fe 2 O 3 is higher than the total emissivity of SiO 2 .…”

Section: Experimental and Resultssupporting

confidence: 88%

See 1 more Smart Citation

Influence of the Mineral Content on the Emissivity of Hydrothermal Char

2020

View full text Add to dashboard Cite

The influence of minerals on solid fuel conversion is an important topic and has so far been addressed focusing mainly on the catalytic effects. Here, the impact of iron oxide on the emissivity of burning char particles was investigated. Synthetic, hydrothermally carbonized char was doped with SiO 2 or with a mixture of SiO 2 and Fe 2 O 3 . The sample was then exposed to an oxy-fuel atmosphere in a laboratory reactor. An established pyrometer/infrared (IR) spectrometer setup was used to measure the size, temperature, and IR radiation of single burning particles. Based on these measurements, the spectral and total emissivity in the near-IR (1.25-2.25 μm) and the total emissivity in the mid-IR region (2.4-5.5 μm) were calculated. The results show that the iron content directly influences the emissivity of char during combustion.

show abstract

Section: Experimental and Resultssupporting

confidence: 88%

“…The larger emissivity of the Fe 2 O 3 ‐HTC char fits previous results of Gorewoda and Scherer for synthetic coal ash. They found that the total (and below 8 µm, also the spectral) emissivity of Fe 2 O 3 is higher than the total emissivity of SiO 2 .…”

Section: Experimental and Resultsmentioning

confidence: 99%

Influence of the Mineral Content on the Emissivity of Hydrothermal Char

2020

View full text Add to dashboard Cite

show abstract

“…The decreasing emissivity of fuel particles at increasing temperatures fits to the expected behavior from the literature [12,16,17]. Although there are slight local minima and maxima in the emissivity of both fuels, the trend is clearly shown.…”

Section: Temperature Dependent Emissivity Evaluationsupporting

confidence: 84%

“…Although these linear correlations are not based on any particular theory, the regression parameters, R 2 = 0.784 in case of nutshells and R 2 = 0.956 in case of coal, provide the best fit. The two linear regression functions for nutshell and for coal are as follows: The decreasing emissivity of fuel particles at increasing temperatures fits to the expected behavior from the literature [12,16,17]. Although there are slight local minima and maxima in the emissivity of both fuels, the trend is clearly shown.…”

Section: Temperature Dependent Emissivity Evaluationsupporting

confidence: 72%

Investigation of Pulverized Biomass and Coal Char Emissivity

Pörtner

Schiemann

2020

Energies

View full text Add to dashboard Cite

Current work presents an optical setup, its calibration and reference process and the first results from single particle emissivity measurements of pulverized biomass and coal fuel particles. In contrast to earlier attempts, the setup offers the possibility of emissivity measurements during the whole particle burn-off. A laser ignites a single particle, placed in the center of the setup. Two photomultipliers observe the emitted particle radiation in the visible range (550 nm and 700 nm) for temperature calculation, using two-color pyrometry. An InSb-detector records the emitted particle radiation between 2.4 µm and 5.5 µm, which is later used to calculate particle emissivity in this range. The conclusion of multiple particle measurements lead to decreasing particle emissivity with increasing temperature. For coal particles the emissivity decreases from 0.45 at 2300 K to 0.03 at 3400 K. Biomass char shows a similar trend with a decrease from 0.18 (2100 K) to 0.03 (2900 K).

show abstract

“…Oxy-fuel CFB combustion of fuels containing carbonate minerals [48][49][50][51] resulted in smaller CO 2 production due to decreased decomposition of carbonate minerals. The extent of carbonate decomposition was calculated based on the content of CaO, MgO and CO 2 in the ashes; the methodology is described more thoroughly by Arro et al [52].…”

Section: Ashesmentioning

confidence: 99%

Ash and Flue Gas from Oil Shale Oxy-Fuel Circulating Fluidized Bed Combustion

et al. 2018

View full text Add to dashboard Cite

Carbon dioxide emissions are considered a major environmental threat. To enable power production from carbon-containing fuels, carbon capture is required. Oxy-fuel combustion technology facilitates carbon capture by increasing the carbon dioxide concentration in flue gas. This study reports the results of calcium rich oil shale combustion in a 60 kW th circulating fluidized bed (CFB) combustor. The focus was on the composition of the formed flue gas and ash during air and oxy-fuel combustion. The fuel was typical Estonian oil shale characterized by high volatile and ash contents. No additional bed material was used in the CFB; the formed ash was enough for the purpose. Two modes of oxy-fuel combustion were investigated and compared with combustion in air. When N 2 in the oxidizer was replaced with CO 2 , the CFB temperatures decreased by up to 100 • C. When oil shale was fired in the CFB with increased O 2 content in CO 2 , the temperatures in the furnace were similar to combustion in air. In air mode, the emissions of SO 2 and NO x were low (<14 and 141 mg/Nm 3 @ 6% O 2 , respectively). Pollutant concentrations in the flue gas during oxy-fuel operations remained low (for OXY30 SO 2 < 14 and NO x 130 mg/Nm 3 @ 6% O 2 and for OXY21 SO 2 23 and NO x 156 mg/Nm 3 @ 6% O 2 ). Analyses of the collected ash samples showed a decreased extent of carbonate minerals decomposition during both oxy-fuel experiments. This results in decreased carbon dioxide emissions. The outcomes show that oxy-fuel CFB combustion of the oil shale ensures sulfur binding and decreases CO 2 production.

show abstract

Influence of Carbonate Decomposition on Normal Spectral Radiative Emittance in the Context of Oxyfuel Combustion

Cited by 17 publications

References 21 publications

Influence of the Mineral Content on the Emissivity of Hydrothermal Char

Influence of the Mineral Content on the Emissivity of Hydrothermal Char

Investigation of Pulverized Biomass and Coal Char Emissivity

Ash and Flue Gas from Oil Shale Oxy-Fuel Circulating Fluidized Bed Combustion

Contact Info

Product

Resources

About