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Träfflista för sökning "LAR1:cth ;pers:(Lyngfelt Anders 1955);conttype:(scientificother);lar1:(cth)"

Sökning: LAR1:cth > Lyngfelt Anders 1955 > Övrigt vetenskapligt/konstnärligt > Chalmers tekniska högskola

  • Resultat 51-60 av 69
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51.
  • Mattisson, Tobias, 1970, et al. (författare)
  • Testing of innovative Fe- and Ca-Mn-based oxygen carriers with natural gas in continuous operation
  • 2017
  • Ingår i: 9th Trondheim Conference on CO2 Capture, Transport and Storage, Trondheim, Norway, June 12-14, 2017.
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • Chemical-looping combustion (CLC) of gaseous fuels, such as natural or refinery gas, could be a viable option in a variety of industries for production of heat and electricity with CCS. Further, CLC can be combined with conventional steam–methane reforming for efficientcarbon-neutral hydrogen production. A series of collaborate European projects have been carried out since 2002, which focused on oxygen-carrier development and upscaling of both the CLC process and oxygen-carrier production with natural gas and refinery gas as fuel. Inthe latest project, SUCCESS (2013-2017), a series of oxygen carriers based on Fe and Ca-Mn materials were developed using commercial and low-cost raw materials. Two commercial methods for particle production were used: impregnation of Fe2O3 on Al2O3 and spray-drying of CaMnO3. In this paper, selected results are presented from investigation of these two promising oxygen carriers using a laboratory-scale unit with continuous operation and a nominal fuel input of 10 kWth. In this unit, the gas velocities in the riser and in the grid jet zone of the gas distributor come close to gas velocities of industrial-scale units and the material is exposed to a large number of redox cycles. Therefore, this unit is highly applicable for judging particle lifetime. Both materials functioned well during operation with natural gas, with little or no agglomeration. The total time with fuel was 30 h and >100 h for the impregnated Fe-based material and the Ca-Mn-based material, respectively. Although the degree of elutriation was high for both materials, the actual fines production (
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52.
  • Mattisson, Tobias, 1970, et al. (författare)
  • The Nordic CO2 Sequestration (NoCO2) project
  • 2006
  • Ingår i: 8th International Conference on Greenhouse Gas Control Technologies, Trondheim, Norway, 19-22 June, 2006.
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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53.
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54.
  • Mei, Daofeng, 1986, et al. (författare)
  • Batch fluidized bed study of the interaction between alkali impurities and braunite oxygen carrier in chemical looping combustion
  • 2022
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • Chemical looping combustion (CLC) is a novel technology for heat and power generation with low-penalty CO2 capture. Using biomass in CLC (bio-CLC), negative CO2 emission can be attained. Alkali (mainly K and Na) in biomass can be problematic in bio-CLC, as it can interact with the oxygen carrier bed. The current work used charcoal and four charcoal samples impregnated with K2CO3, Na2CO3, KCl and NaCl, respectively, to study alkali interaction with a low-alkali braunite manganese ore oxygen carrier. The experiments were successfully carried out at 950°C in a quartz batch fluidized-bed reactor. For each alkali-fuel sample, more than 30 cycles of redox were performed. Using the solid fuel impregnated with K2CO3, Na2CO3, KCl and NaCl, char gasification was improved by a factor of 10, 8, 4 and 3 as compared to the non-impregnated fuel. Partial-defluidization of the braunite particles was found with all the alkali-fuels, although the extent differed, e.g. K2CO3 and KCl resulted in earlier onset of partial defluidization than Na2CO3 and NaCl. Hard agglomeration was never observed, while soft partial agglomeration was seen. Accumulation of K, Si, and Ca in agglomerates and particle boundary was found after cycles with K2CO3- and KCl-charcoal, while Na, Si and Ca was found after the Na2CO3- and NaCl-charcoal cycles. The mechanism of agglomeration formation seems different for these alkali-charcoals. For K2CO3- and KCl-charcoal, it seems the potassium reacted with Fe and Mn in the braunite, forming low-melting point components and thus led to agglomeration. In the case of Na2CO3- and NaCl-charcoal, direct reaction with the braunite was not seen, and it seems as if other reactive species combined were formed, which acted as a binder between particles to form agglomerates. In addition, after cycles with the K2CO3- and Na2CO3- charcoals, 80% K and 40% Na were retained in the oxygen carrier particles. After the use with all the alkalis, the braunite reactivity with CH4, CO and H2 was similar to the fresh particles. It is clear that alkali species could react with the braunite oxygen carriers, and this could affect reactivity and fluidization tendency in the long run. Still, only soft agglomerates and partial defluidization were found, which may not be the case in a real CLC system operating at higher fluidizing velocities.
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55.
  • Mei, Daofeng, 1986, et al. (författare)
  • Investigation of LD-slag as oxygen carrier for CLC and OCAC in a 10 kW unit using high-volatile biomass
  • 2022
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • A steel slag from the Linz-Donawitz process, called LD-slag and having significant calcium and iron-fractions, was investigated as an oxygen carrier in a 10 kWth chemical-looping combustor with three high-volatile biomass fuels. In order to improve operability, the LD-slag was found to require heat-treatment under high temperature before using in the unit. In total, operation with the biomasses was conducted for more than 26 hours at the temperatures of 870-980°C. The fuel thermal power was in the range of 3.4-10 kWth. The operation involved chemical looping combustion (CLC), chemical looping gasification (CLG) and oxygen carrier aided combustion (OCAC). Around 12 h was in CLC operation, 13.3 h was conducted under CLG-conditions, while the remaining 0.7 hour was OCAC. Here, the focus is on the results obtained during the CLC and OCAC parts of the campaign. The increase of temperature in the fuel reactor and air flow to the air reactor leads to better performance, with the oxygen demand reduced to 10% while the carbon capture was always higher than 95%. Steam concentration in the fuel reactor has little effect on the performance. In OCAC, a higher oxygen ratio promotes the combustion a lot, with the normalized CO2 concentration >95%, indicating almost full combustion. The circulating oxygen carrier can also contribute to OCAC, while more study is needed. Bed agglomeration was found in OCAC tests, whereas this is absent in CLC/CLG.
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56.
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57.
  • Moldenhauer, Patrick, 1983, et al. (författare)
  • Chemical-Looping Combustion with Liquid Fuels
  • 2012
  • Ingår i: 11th International Conference on Greenhouse Gas Technologies GHGT-11, Kyoto, Japan, November 18-22, 2012.
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • A project devoted to establishing chemical-looping combustion with liquid fuels currently being conducted by Chalmers University of Technology with support from Saudi Aramco is presented. The ultimate goal of the project is to develop technology capable of utilizing and processing heavy residual oils with inherent CO2 capture.Heavy oil residues are intermediate products from oil refineries. Some of those residues can be blended with lighter oil fractions to produce fuel oils, while others are waste products. Heavy oil residues are highly viscous at ambient temperature and contain high amounts of impurities such as sulfur, up to 6 wt-%, and metals, up to 1000 ppm. Using such fuel in a stationary combustion process with separation of CO2, namely chemical-looping combustion, might be an interesting option. The use of kerosene and fuel oil are intermediate steps in the upscaling of the process.
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58.
  • Moldenhauer, Patrick, 1983, et al. (författare)
  • Oxygen carrier development of calcium manganite-based materials with perovskite structure for chemical looping combustion of methane
  • 2017
  • Ingår i: Proceedings of the 42nd International Technical Conference on Clean Energy, Clearwater, FL, USA, June 11-15, 2017. ; , s. 12-
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • Chemical-looping combustion (CLC) of gaseous fuels could be of interest in industrial processes for heat, power or hydrogen production with carbon capture. For instance, production of steam or hydrogen from refinery gas are possible applications. A series of collaborate European projects has been carried out since 2002, which focused on oxygen-carrier development and upscaling of both theCLC process and oxygen-carrier production with methane or natural gas as fuel. Most recently, in the FP7 SUCCESS project (2013-2017), Ca-Mn-based materials with perovskite structure, CaMnO3, were produced at a larger scale and with cheap and commercial raw materials. The main advantage with this type of oxygen carrier is the ability to release oxygen to the gas phase, hence promoting reactivity in the fuel reactor. In the project, a significant number of such materials were produced and tested. It was found that a perovskite structure can be obtained relatively easy with widely different raw materials for Ca, Mn, Ti and Mg. The produced materials generally had high reactivities and high attrition resistances, but were prone to sulfur poisoning.In this paper, selected results are presented from the different stages of material development and upscaling, i.e., from bench-scale reactors with batch and continuous operation, respectively, as well as from a laboratory-scale unit with continuous operation and a nominal fuel input of 10 kWth. In the 10 kW unit, the gas velocities in the riser and in the grid jet zone of the gas distributor come close to gas velocities of industrial-scale units and, therefore, this unit is used to assess particle lifetime. Results from the 10 kW unit show that very high degrees of fuel conversion can be reached while achieving very high lifetimes.
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59.
  • Moldenhauer, Patrick, 1983, et al. (författare)
  • The use of ilmenite as oxygen carrier with kerosene in a 300W CLC laboratory reactor with continuous circulation
  • 2012
  • Ingår i: Proceedings of the 2nd International Conference on Chemical Looping, Darmstadt, Germany, September 26-28, 2012.
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • Heavy oil residues are intermediate products from oil refineries. Some of those residues can be blended with lighter oil fractions to produce fuel oils, while others are waste products. Heavy oil residues are highly viscous at ambient temperature and contain high amounts of impurities such as sulfur, up to 6 wt-%, and metals, up to 1000 ppm. Using such fuel in a stationary combustion process with separation of CO2, namely chemical-looping combustion, might be an interesting option. The use of kerosene is an intermediate step in the upscaling of the process.An ilmenite oxygen carrier was tested in a laboratory scale chemical-looping reactor with a design thermal capacity of 300 W. Ilmenite is a mineral iron-titanium oxide, which has been used extensively as an oxygen carrier in CLC. Two different kinds of fuels were used, a sulfur-free kerosene and one that contained 0.57 mass-% sulfur. Both fuels were continuously evaporated and directly fed into the chemical-looping reactor. Experiments were conducted for 50 h with the sulfur-free kerosene and for 30 h with the sulfurous kerosene. CO2 yields above 99% were achieved with both types of fuel. It seems that a significant and lasting improvement in the oxygen carrier’s reactivity was achieved by using sulfurous kerosene. No evidence of sulfur was found on the particles’ surface.
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60.
  • Moldenhauer, Patrick, 1983, et al. (författare)
  • The use of ilmenite as oxygen carrier with kerosene in a 300W CLC laboratory reactor with continuous circulation
  • 2012
  • Ingår i: Proceedings of the 2nd International Conference on Chemical Looping, Darmstadt, Germany, September 26-28, 2012.
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • An ilmenite oxygen carrier was tested in a laboratory scale chemical-looping reactor with a design thermal capacity of 300 W. Ilmenite is a mineral iron-titanium oxide, which has been used extensively as an oxygen carrier in CLC. Two different kinds of fuels were used, a sulfur-free kerosene and one that contained 0.57 mass-% sulfur. Both fuels were continuously evaporated and di-rectly fed into the chemical-looping reactor. Experiments were conducted for 50 h with the sulfur-free kerosene and for 30 h with the sulfurous kerosene. CO2 yields above 99% were achieved with both types of fuel. It seems that a significant and lasting improvement in the oxygen carrier’s reactivity was achieved by using sulfurous kerosene. No evidence of sulfur was found on the particles’ surface.
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