The Experts below are selected from a list of 1473 Experts worldwide ranked by ideXlab platform
Maria U Alzueta - One of the best experts on this subject based on the ideXlab platform.
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polycyclic aromatic hydrocarbons pah soot and light Gases formed in the pyrolysis of acetylene at different temperatures effect of fuel concentration
Journal of Analytical and Applied Pyrolysis, 2013Co-Authors: Nazly E Sanchez, A Millera, Rafael Bilbao, Maria U AlzuetaAbstract:Abstract The effect of different inlet hydrocarbon concentrations (10,000, 20,000 and 30,000 ppmv) and reaction temperatures (873–1323 K) on PAH and soot formation from acetylene pyrolysis has been studied. 16 PAH considered by Environmental Protection Agency (EPA) as priority pollutants, together with light Gases present at the Outlet Gas Stream, have been quantified. Soot formed was collected on a filter at the reactor Outlet. PAH found in the different phases (at the Gas phase, adsorbed on soot, and/or stuck on reactor walls) were analysed by means of Gas chromatography–mass spectrometry (GC–MS). Increasing fuel concentration and reaction temperature resulted in the increase in soot production together with decrease in the light Gases at the reactor Outlet. The acetylene conversion and the hydrogen concentration increased with the temperature, whereas benzene and the total PAH quantified showed a maximum around 1123 and 1223 K, respectively. In all cases, the concentration of products such as hydrogen, benzene, PAH and soot at the reactor Outlet and the acetylene conversion increased with the reactant concentration. The temperature, at which the benzene showed a maximum concentration, was similar to the temperature where soot and PAH started to be formed. This suggests that benzene consumption leads to form PAH, which subsequently form soot, by following the well-known HACA (hydrogen abstraction/acetylene addition) mechanism.
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formation of pah and soot during acetylene pyrolysis at different Gas residence times and reaction temperatures
Energy, 2012Co-Authors: Nazly E Sanchez, Alicia Callejas, A Millera, Rafael Bilbao, Maria U AlzuetaAbstract:The formation of polycyclic aromatic hydrocarbons (PAH)11Polycyclic aromatic hydrocarbons. and soot from the pyrolysis of acetylene was studied, taking into account the influence of the operating conditions, such as Gas residence time and temperature. The influence of Gas residence time was considered between 1.28 and 3.88 s for the experiments carried out under different temperatures from 1073 to 1223 K. The total PAH was calculated as the addition of PAH concentration found in different locations, namely adsorbed on soot and on the reactor walls, and at the Outlet Gas Stream. The relationship between the PAH concentrations and their carcinogenic equivalence sum (KE)22Carcinogenic equivalence sum. was also evaluated. The results obtained showed that temperature and residence time have a high influence on pyrolysis products, especially on the PAH concentration adsorbed on soot, which exhibited the highest KE in all cases studied.
Juan Adanez - One of the best experts on this subject based on the ideXlab platform.
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chemical looping combustion of different types of biomass in a 0 5 kwth unit
Fuel, 2018Co-Authors: T Mendiara, Anton Perezastray, M Izquierdo, A Abad, L F De Diego, F Garcialabiano, P Gayan, Juan AdanezAbstract:Abstract Chemical Looping Combustion (CLC) using renewable solid fuels appears as an important option to reach negative carbon emissions. In this work, three types of forest and agricultural residues (pine sawdust, olive stone and almond shell) were tested between 900–980 °C in a 0.5 kWth unit with an iron ore as oxygen carrier (Tierga ore) working under In situ Gasification-Chemical Looping Combustion (iG-CLC) mode. Specific solids inventories lower than 1000 kg/MWth were tested as they were consider more representative of what can be used in a larger CLC unit. CO2 represented about 70% in the fuel reactor Outlet Gas Stream, followed by unburnt compounds: H2, CO and CH4. CO2 capture efficiencies increased with the fuel reactor temperature achieving almost 100% of capture with the three biomasses at temperatures above 950 °C. In contrast, no clear trend with the fuel reactor temperature was observed for the total oxygen demand, achieving values about 25%. The major contribution to this value comes from the unburned volatiles with a small contribution coming from tar (≈ 1%). Regarding tar, naphthalene was the major compound found at the different operating conditions. The present results support the consideration of the CLC process with biomass (bio-CLC) as a promising Bio-Energy with Carbon Capture (BECCS) technology.
Nazly E Sanchez - One of the best experts on this subject based on the ideXlab platform.
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polycyclic aromatic hydrocarbons pah soot and light Gases formed in the pyrolysis of acetylene at different temperatures effect of fuel concentration
Journal of Analytical and Applied Pyrolysis, 2013Co-Authors: Nazly E Sanchez, A Millera, Rafael Bilbao, Maria U AlzuetaAbstract:Abstract The effect of different inlet hydrocarbon concentrations (10,000, 20,000 and 30,000 ppmv) and reaction temperatures (873–1323 K) on PAH and soot formation from acetylene pyrolysis has been studied. 16 PAH considered by Environmental Protection Agency (EPA) as priority pollutants, together with light Gases present at the Outlet Gas Stream, have been quantified. Soot formed was collected on a filter at the reactor Outlet. PAH found in the different phases (at the Gas phase, adsorbed on soot, and/or stuck on reactor walls) were analysed by means of Gas chromatography–mass spectrometry (GC–MS). Increasing fuel concentration and reaction temperature resulted in the increase in soot production together with decrease in the light Gases at the reactor Outlet. The acetylene conversion and the hydrogen concentration increased with the temperature, whereas benzene and the total PAH quantified showed a maximum around 1123 and 1223 K, respectively. In all cases, the concentration of products such as hydrogen, benzene, PAH and soot at the reactor Outlet and the acetylene conversion increased with the reactant concentration. The temperature, at which the benzene showed a maximum concentration, was similar to the temperature where soot and PAH started to be formed. This suggests that benzene consumption leads to form PAH, which subsequently form soot, by following the well-known HACA (hydrogen abstraction/acetylene addition) mechanism.
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formation of pah and soot during acetylene pyrolysis at different Gas residence times and reaction temperatures
Energy, 2012Co-Authors: Nazly E Sanchez, Alicia Callejas, A Millera, Rafael Bilbao, Maria U AlzuetaAbstract:The formation of polycyclic aromatic hydrocarbons (PAH)11Polycyclic aromatic hydrocarbons. and soot from the pyrolysis of acetylene was studied, taking into account the influence of the operating conditions, such as Gas residence time and temperature. The influence of Gas residence time was considered between 1.28 and 3.88 s for the experiments carried out under different temperatures from 1073 to 1223 K. The total PAH was calculated as the addition of PAH concentration found in different locations, namely adsorbed on soot and on the reactor walls, and at the Outlet Gas Stream. The relationship between the PAH concentrations and their carcinogenic equivalence sum (KE)22Carcinogenic equivalence sum. was also evaluated. The results obtained showed that temperature and residence time have a high influence on pyrolysis products, especially on the PAH concentration adsorbed on soot, which exhibited the highest KE in all cases studied.
T Mendiara - One of the best experts on this subject based on the ideXlab platform.
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chemical looping combustion of different types of biomass in a 0 5 kwth unit
Fuel, 2018Co-Authors: T Mendiara, Anton Perezastray, M Izquierdo, A Abad, L F De Diego, F Garcialabiano, P Gayan, Juan AdanezAbstract:Abstract Chemical Looping Combustion (CLC) using renewable solid fuels appears as an important option to reach negative carbon emissions. In this work, three types of forest and agricultural residues (pine sawdust, olive stone and almond shell) were tested between 900–980 °C in a 0.5 kWth unit with an iron ore as oxygen carrier (Tierga ore) working under In situ Gasification-Chemical Looping Combustion (iG-CLC) mode. Specific solids inventories lower than 1000 kg/MWth were tested as they were consider more representative of what can be used in a larger CLC unit. CO2 represented about 70% in the fuel reactor Outlet Gas Stream, followed by unburnt compounds: H2, CO and CH4. CO2 capture efficiencies increased with the fuel reactor temperature achieving almost 100% of capture with the three biomasses at temperatures above 950 °C. In contrast, no clear trend with the fuel reactor temperature was observed for the total oxygen demand, achieving values about 25%. The major contribution to this value comes from the unburned volatiles with a small contribution coming from tar (≈ 1%). Regarding tar, naphthalene was the major compound found at the different operating conditions. The present results support the consideration of the CLC process with biomass (bio-CLC) as a promising Bio-Energy with Carbon Capture (BECCS) technology.
A Millera - One of the best experts on this subject based on the ideXlab platform.
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polycyclic aromatic hydrocarbons pah soot and light Gases formed in the pyrolysis of acetylene at different temperatures effect of fuel concentration
Journal of Analytical and Applied Pyrolysis, 2013Co-Authors: Nazly E Sanchez, A Millera, Rafael Bilbao, Maria U AlzuetaAbstract:Abstract The effect of different inlet hydrocarbon concentrations (10,000, 20,000 and 30,000 ppmv) and reaction temperatures (873–1323 K) on PAH and soot formation from acetylene pyrolysis has been studied. 16 PAH considered by Environmental Protection Agency (EPA) as priority pollutants, together with light Gases present at the Outlet Gas Stream, have been quantified. Soot formed was collected on a filter at the reactor Outlet. PAH found in the different phases (at the Gas phase, adsorbed on soot, and/or stuck on reactor walls) were analysed by means of Gas chromatography–mass spectrometry (GC–MS). Increasing fuel concentration and reaction temperature resulted in the increase in soot production together with decrease in the light Gases at the reactor Outlet. The acetylene conversion and the hydrogen concentration increased with the temperature, whereas benzene and the total PAH quantified showed a maximum around 1123 and 1223 K, respectively. In all cases, the concentration of products such as hydrogen, benzene, PAH and soot at the reactor Outlet and the acetylene conversion increased with the reactant concentration. The temperature, at which the benzene showed a maximum concentration, was similar to the temperature where soot and PAH started to be formed. This suggests that benzene consumption leads to form PAH, which subsequently form soot, by following the well-known HACA (hydrogen abstraction/acetylene addition) mechanism.
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formation of pah and soot during acetylene pyrolysis at different Gas residence times and reaction temperatures
Energy, 2012Co-Authors: Nazly E Sanchez, Alicia Callejas, A Millera, Rafael Bilbao, Maria U AlzuetaAbstract:The formation of polycyclic aromatic hydrocarbons (PAH)11Polycyclic aromatic hydrocarbons. and soot from the pyrolysis of acetylene was studied, taking into account the influence of the operating conditions, such as Gas residence time and temperature. The influence of Gas residence time was considered between 1.28 and 3.88 s for the experiments carried out under different temperatures from 1073 to 1223 K. The total PAH was calculated as the addition of PAH concentration found in different locations, namely adsorbed on soot and on the reactor walls, and at the Outlet Gas Stream. The relationship between the PAH concentrations and their carcinogenic equivalence sum (KE)22Carcinogenic equivalence sum. was also evaluated. The results obtained showed that temperature and residence time have a high influence on pyrolysis products, especially on the PAH concentration adsorbed on soot, which exhibited the highest KE in all cases studied.
