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Tiejun Wang - One of the best experts on this subject based on the ideXlab platform.
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CATALYTIC REFORMING OF BIOMASS RAW Fuel Gas TO SYNGas FOR FT LIQUID FuelS PRODUCTION
2014Co-Authors: Tiejun Wang, Chenguang Wang, Qi ZhangAbstract:The Gasification of biomass to obtain a synGas provides a competitive means for clean FT（Fischer-Tropsch）liquid Fuels from renewable resources. The feasibility of the process depends on the upgrading of raw Fuel Gas from Gasifier to desired synGas. In this paper, partial oxidation reforming of biomass raw Fuel Gas with addition of 3-8mol % O2 were investigated over nickel based monolith catalysts prepared by wet impregnation of NiO on the surface of cordierite. The composition of producer synGas was analyzed by Gas chromatogram (GC) and Gas chromatogram- mass spectrum (GC-MS). The carbon deposition on the surface of catalyst was analyzed by method of thermogravimetry. The results showed that partial oxidation reforming process had excellent performance of upgrading biomass raw Fuel Gas. Under the reforming temperature of 780℃, above 99 % of biomass tar and other hydrocarbons in the raw Fuel Gas was converted into H2 and CO. Only trace lighter hydrocarbons (<1mg/Nm3) as aerosol and 0.2mol % CH4 were remained in the synGas. No coke deposition was detected during 108h lifetime test, which indicated that the addition of O2 can effectively prohibit the coke formation on the surface of catalyst. The H2/CO ratio of producer synGas can be adjusted from 1.2 to 2.5 with addition of steam, which was suitable to the synthesis of FT liquid Fuels. 1
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auto thermal reforming of biomass raw Fuel Gas to synGas in a novel reformer promotion of hot electron
Applied Energy, 2013Co-Authors: Tiejun Wang, Yong Yang, Mingyue Ding, Qiying LiuAbstract:A novel reformer with porous ceramic oxygen distribution tube circled by electric wire for inspiring hot electron was designed for auto-thermal reforming of biomass raw Fuel Gas to produce synGas (H-2 + CO). The temperature of auto-thermal reformer was nearly uniform due to the excellent performance of partial oxygenation reaction in the reformer with porous ceramic tube for oxygen partitioning. The hot-electron inspired by electric wire promoted the cracking of biomass tar to form radical species, which were converted effectively to synGas over nickel based catalyst. The hot-electron also played an essential role in decreasing coke deposition on the surface of nickel based catalyst, which prolonged the lifetime of the reforming catalyst. (C) 2013 Published by Elsevier Ltd.
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upgrading biomass Fuel Gas by reforming over ni mgo γ al2o3 cordierite monolithic catalysts in the lab scale reactor and pilot scale multi tube reformer
Applied Energy, 2012Co-Authors: Minghuang Qiu, Chenguang Wang, Tiejun Wang, Qing Zhang, Xinghua ZhangAbstract:The effect of Ni/Mg mole ratio of Ni–MgO/γ-Al2O3 cordierite monolithic catalysts on dry reforming of model biomass Fuel Gas(H2/CO/C2H4/CH4/CO2/N2=16.0/12.1/2.5/15.1/22.0/32.3, vol.%) was investigated in a lab-scale stainless steel tubular reactor. The results showed that CH4 and CO2 conversions, H2 and CO yields and H2/CO ratio in the tail Gas was 87.2%, 54.4%, 65.2%, 43.0%, and 1.17 respectively at 750°C over the optimized MCNi0.51Mg0.49O (the ratio was 0.51:0.49 with 8.3wt% NiO loading amount) during 60h of time on stream (TOS). And the formation of NiO–MgO solid solution structure would restrain the active Ni0 centers from agglomeration and decrease carbon deposition. Cold test of the vertical-placed tubular reformers (packed by monolith of 7mm cell spacing) indicated that the pressure drop was as low as 850Pa at 1.57m/s of Gas velocity with 330g/m3 fly ash added. The reforming of real biomass Fuel Gas (H2/CO/C2H4/CH4/CO2/N2=10.2/16.8/0.5/6.4/15.2/51.0, vol.%, from air Gasification of 200–250kg/h pine sawdust in the pilot plant) in the multi-tube reformer packed with MCP (larger in size than MCNi0.51Mg0.49O) exhibits the pressure drop of less than 700Pa, CH4 and CO2 conversions of about 84% and 38.5% and the decrease of tar content from 4.8–5.3g/m3 to 0.12–0.14g/m3 during 60h TOS at 670°C. The characterization of the spent catalysts by TG, XRD and ICP-AES proved the anti-sintering and anti-carbon deposition properties of NiO–MgO solid solution monolithic catalyst.
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steam reforming of biomass raw Fuel Gas over nio mgo solid solution cordierite monolith catalyst
Energy Conversion and Management, 2010Co-Authors: Chenguang Wang, Tiejun Wang, Chuangzhi WuAbstract:The NiO-MgO solid solution cordierite monolith catalyst was prepared by impregnation. 60 h steam reforming tests were carried out at 1023 K TC was used to analyze the carbon deposition on the catalyst. GC and GC-MS were used to analyze the component of biomass Fuel Gas and tar. The results show that steam reforming can effectively improve the quality of Fuel Gas, H(2)/CO ratio can be adjusted by steam reforming, The addition of steam can also increase the activity and stability of the catalyst dramatically. The CH(4) conversion reached 94%. TG shows that the addition of steam can decrease the carbon deposition on the catalyst. GC-MS result shows that most of the tar was converted to H(2), CO and trace lighter component. Steam reforming can eliminate the biomass tar species more deeply than dry reforming. (C) 2009 Elsevier Ltd. All rights reserved.
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reforming of raw Fuel Gas from biomass Gasification to synGas over highly stable nickel magnesium solid solution catalysts
Fuel Processing Technology, 2006Co-Authors: Tiejun Wang, Jie Chang, Xiaoqin Cui, Qi ZhangAbstract:Abstract The Gasification of biomass to obtain a synGas provides a competitive means for clean energy from renewable resources. The feasibility of the process depends on the performance of catalyst for upgrading of the raw Fuel Gas from Gasifier. The highly stable NiO–MgO catalyst (Ni / (Ni + Mg) = 15, atomic ratio) was prepared by co-precipitation method for the reforming of raw Fuel Gas. Its performance was investigated under practical conditions of biomass Gasification. The Ni 0.03 Mg 0.97 O and Ni / MgO catalysts (Ni / (Ni + Mg) = 15, atomic ratio) were also prepared for comparison. The NiO–MgO catalyst exhibited excellent reducibility and highly stable activity for the reforming of raw Fuel Gas without pre-reduction. No deactivation and very little carbon deposition were observed during 100 h lifetime test. The results of characterization (H 2 –TPR, TGA, XRD, XPS) indicated that the formation of nickel–magnesium solid solution inhibited the sintering of nickel particles for high temperature reaction. Due to Ni 2+ ions diffusion, the Ni / Mg atomic ratio decreased gradually with increasing depth. The highly stable activity was attributed to the small nickel particles size, high dispersion of nickel particles in the solid solution structure, and the promotion by catalyst reducibility.
Cristina Dueso - One of the best experts on this subject based on the ideXlab platform.
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effect of Fuel Gas composition in chemical looping combustion with ni based oxygen carriers 1 fate of sulfur
Industrial & Engineering Chemistry Research, 2009Co-Authors: F Garcialabiano, Luis F De Diego, P Gayan, Juan Adanez, Alberto Abad, Cristina DuesoAbstract:Chemical-looping combustion (CLC) has been suggested among the best alternatives to reduce the economic cost of CO2 capture using Fuel Gas because CO2 is inherently separated in the process. For Gaseous Fuels, natural Gas, refinery Gas, or synGas from coal Gasification can be used. These Fuels may contain different amounts of sulfur compounds, such as H2S and COS. An experimental investigation of the fate of sulfur during CH4 combustion in a 500 Wth CLC prototype using a Ni-based oxygen carrier has been carried out. The effect on the oxygen carrier behavior and combustion efficiency of several operating conditions such as temperature and H2S concentration has been analyzed. Nickel sulfide, Ni3S2, was formed at all operating conditions in the Fuel reactor, which produced an oxygen carrier deactivation and lower combustion efficiencies. However, the oxygen carrier recovered their initial reactivity after certain time without sulfur addition. The sulfides were transported to the air reactor where SO2 was pro...
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effect of Fuel Gas composition in chemical looping combustion with ni based oxygen carriers 2 fate of light hydrocarbons
Industrial & Engineering Chemistry Research, 2009Co-Authors: Juan Adanez, F Garcialabiano, Luis F De Diego, P Gayan, Cristina Dueso, Alberto AbadAbstract:Chemical-looping combustion (CLC) has been suggested among the best alternatives to reduce the economic cost of CO2 capture using Fuel Gas because CO2 is inherently separated in the process. Natural Gas or refinery Gas can be used as Gaseous Fuels, and they may contain different amounts of light hydrocarbons (LHC). The purpose of this work was to investigate the effect of the presence of light hydrocarbons (C2H6 and C3H8) in the feeding Gas of a CLC system using a nickel-based oxygen carrier prepared by impregnation on alumina. The reactivity of the oxygen carrier with light hydrocarbons and the combustion efficiency of the process were analyzed in a batch fluidized bed (FB) and a continuous CLC plant. The experiments in the batch FB showed that light hydrocarbons can be fully converted in a CLC process at temperatures above 1173 K. The influence of the Fuel reactor temperature (1073−1153 K), solid circulation flow rate (7−14 kg/h), and Gas composition was studied in a continuous CLC plant (500 Wth). Neit...
Chenguang Wang - One of the best experts on this subject based on the ideXlab platform.
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CATALYTIC REFORMING OF BIOMASS RAW Fuel Gas TO SYNGas FOR FT LIQUID FuelS PRODUCTION
2014Co-Authors: Tiejun Wang, Chenguang Wang, Qi ZhangAbstract:The Gasification of biomass to obtain a synGas provides a competitive means for clean FT（Fischer-Tropsch）liquid Fuels from renewable resources. The feasibility of the process depends on the upgrading of raw Fuel Gas from Gasifier to desired synGas. In this paper, partial oxidation reforming of biomass raw Fuel Gas with addition of 3-8mol % O2 were investigated over nickel based monolith catalysts prepared by wet impregnation of NiO on the surface of cordierite. The composition of producer synGas was analyzed by Gas chromatogram (GC) and Gas chromatogram- mass spectrum (GC-MS). The carbon deposition on the surface of catalyst was analyzed by method of thermogravimetry. The results showed that partial oxidation reforming process had excellent performance of upgrading biomass raw Fuel Gas. Under the reforming temperature of 780℃, above 99 % of biomass tar and other hydrocarbons in the raw Fuel Gas was converted into H2 and CO. Only trace lighter hydrocarbons (<1mg/Nm3) as aerosol and 0.2mol % CH4 were remained in the synGas. No coke deposition was detected during 108h lifetime test, which indicated that the addition of O2 can effectively prohibit the coke formation on the surface of catalyst. The H2/CO ratio of producer synGas can be adjusted from 1.2 to 2.5 with addition of steam, which was suitable to the synthesis of FT liquid Fuels. 1
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upgrading biomass Fuel Gas by reforming over ni mgo γ al2o3 cordierite monolithic catalysts in the lab scale reactor and pilot scale multi tube reformer
Applied Energy, 2012Co-Authors: Minghuang Qiu, Chenguang Wang, Tiejun Wang, Qing Zhang, Xinghua ZhangAbstract:The effect of Ni/Mg mole ratio of Ni–MgO/γ-Al2O3 cordierite monolithic catalysts on dry reforming of model biomass Fuel Gas(H2/CO/C2H4/CH4/CO2/N2=16.0/12.1/2.5/15.1/22.0/32.3, vol.%) was investigated in a lab-scale stainless steel tubular reactor. The results showed that CH4 and CO2 conversions, H2 and CO yields and H2/CO ratio in the tail Gas was 87.2%, 54.4%, 65.2%, 43.0%, and 1.17 respectively at 750°C over the optimized MCNi0.51Mg0.49O (the ratio was 0.51:0.49 with 8.3wt% NiO loading amount) during 60h of time on stream (TOS). And the formation of NiO–MgO solid solution structure would restrain the active Ni0 centers from agglomeration and decrease carbon deposition. Cold test of the vertical-placed tubular reformers (packed by monolith of 7mm cell spacing) indicated that the pressure drop was as low as 850Pa at 1.57m/s of Gas velocity with 330g/m3 fly ash added. The reforming of real biomass Fuel Gas (H2/CO/C2H4/CH4/CO2/N2=10.2/16.8/0.5/6.4/15.2/51.0, vol.%, from air Gasification of 200–250kg/h pine sawdust in the pilot plant) in the multi-tube reformer packed with MCP (larger in size than MCNi0.51Mg0.49O) exhibits the pressure drop of less than 700Pa, CH4 and CO2 conversions of about 84% and 38.5% and the decrease of tar content from 4.8–5.3g/m3 to 0.12–0.14g/m3 during 60h TOS at 670°C. The characterization of the spent catalysts by TG, XRD and ICP-AES proved the anti-sintering and anti-carbon deposition properties of NiO–MgO solid solution monolithic catalyst.
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steam reforming of biomass raw Fuel Gas over nio mgo solid solution cordierite monolith catalyst
Energy Conversion and Management, 2010Co-Authors: Chenguang Wang, Tiejun Wang, Chuangzhi WuAbstract:The NiO-MgO solid solution cordierite monolith catalyst was prepared by impregnation. 60 h steam reforming tests were carried out at 1023 K TC was used to analyze the carbon deposition on the catalyst. GC and GC-MS were used to analyze the component of biomass Fuel Gas and tar. The results show that steam reforming can effectively improve the quality of Fuel Gas, H(2)/CO ratio can be adjusted by steam reforming, The addition of steam can also increase the activity and stability of the catalyst dramatically. The CH(4) conversion reached 94%. TG shows that the addition of steam can decrease the carbon deposition on the catalyst. GC-MS result shows that most of the tar was converted to H(2), CO and trace lighter component. Steam reforming can eliminate the biomass tar species more deeply than dry reforming. (C) 2009 Elsevier Ltd. All rights reserved.
Eiji Sasaoka - One of the best experts on this subject based on the ideXlab platform.
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temperature programmed decomposition desorption of the mercury species over spent iron based sorbents for mercury removal from coal derived Fuel Gas
Fuel, 2008Co-Authors: Masaki Ozaki, Md Azhar Uddin, Eiji SasaokaAbstract:Abstract Development of an elemental mercury (Hg 0 ) removal process for coal derived Fuel Gas is an important issue in the development of a clean and highly efficient coal power generation system. Recently, iron-based sorbents such as iron oxide (Fe 2 O 3 ), supported iron oxide on TiO 2 , and iron disulfide have been proposed as active mercury sorbents. It was supposed that Hg 0 reacted with H 2 S on the iron-based sorbents and captured mercury. However, the mercury species captured on the sorbents have not been directly characterized yet. The captured mercury species was too small to identify because the concentration of Hg 0 was very low (ppb order). In this study, a temperature programmed decomposition technique is applied in order to understand the decomposition character of the mercury species captured on iron-based sorbents. The Hg 0 removal experiments were carried out in a laboratory-scale fixed-bed reactor at 80 °C using simulated Fuel Gas. After the Hg 0 removal experiments, desorption of the captured mercury species was carried out in the same fixed-bed reactor using an atomic absorption spectrophotometer. Temperature programmed decomposition desorption (TPDD) experiments revealed that the decomposition characteristic of mercury species captured on the sorbent was similar to that of HgS reagents (cinnabar and meta-cinnabar). Furthermore, it was observed that the characteristics of the decomposition of mercury species depended on the sorbent type of sorbents and reaction conditions.
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development of iron based sorbents for hg0 removal from coal derived Fuel Gas effect of hydrogen chloride
Fuel, 2008Co-Authors: Masaki Ozaki, Md Azhar Uddin, Eiji SasaokaAbstract:Laboratory studies were conducted to develop an elemental mercury (Hg°) removal process based on the reaction of H 2 S and Hg° using iron-based sorbents for coal derived Fuel Gas. It is well known that hydrogen chloride (HCl) is present in Fuel Gases derived from some types of coal, but the effect of HCl on the Hg° removal performance of iron-based sorbents in coal derived Fuel Gas is not yet well understood. In this study, the effects of HCl on the removal of Hg° from coal derived Fuel Gases over iron-based sorbents such as iron oxide (Fe 2 O 3 ), supported iron oxides on TiO 2 , iron oxide-Ca(OH) 2 , and iron sulfides were investigated. The Hg° removal experiments were carried out in a laboratory-scale fixed-bed reactor at 80 °C using simulated Fuel Gas. In the case of iron oxide (Fe 2 O 3 ), the presence of HCl suppressed the Hg° removal rate. In the case of Fe 2 O 3 (2 or 5 wt%)/TiO 2 , the presence of HCl did not suppress the Hg° removal rate and the activity was stable. The Hg° removal performance of reagent FeS 2 was higher than that of the iron oxide, and not affected by the presence of HCl. The Hg° removal rate of iron oxide-Ca(OH) 2 was not effected by the presence of HCl, because HCl was captured by Ca(OH) 2 . The reagent FeS 2 showed higher Hg 0 removal activity than that of FeS 2 ore. However, the Hg° removal performance of ground and kneaded FeS 2 ore was comparable to that of reagent FeS 2 probably due to the increase in porosity of the FeS 2 ore by grinding and kneading.
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characteristics of the removal of mercury vapor in coal derived Fuel Gas over iron oxide sorbents
Fuel, 2006Co-Authors: Shengji Wu, Azhar Uddin, Eiji SasaokaAbstract:Abstract The characteristics of a novel method for Hg removal using H 2 S and sorbents containing iron oxide were studied. Previously, we have suggested that this method is based on the reaction of Hg and H 2 S over the sorbents to form HgS. However, the reaction mechanism is not well understood. In this work, the characteristics of the Hg removal were studied to clarify the reaction mechanism. In laboratory made sorbents containing iron oxide were used as the sorbent to remove mercury vapor from simulated coal derived Fuel Gases having a composition of Hg (4.8 ppb), H 2 S (400 ppm), CO (30%), H 2 (20%), H 2 O (8%), and N 2 (balance Gas). The following results were obtained: (1) The presence of H 2 S was indispensable for the removal of Hg from coal derived Fuel Gas; (2) Hg was removed effectively by the sorbents containing iron oxide in the temperature range of 60–100 °C; (3) The presence of H 2 O suppressed the Hg removal activity; (4) The presence of oxygen may play very important role in the Hg removal and; (5) Formation of elemental sulfur was observed upon heating of the used sample.
Alberto Abad - One of the best experts on this subject based on the ideXlab platform.
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effect of Fuel Gas composition in chemical looping combustion with ni based oxygen carriers 1 fate of sulfur
Industrial & Engineering Chemistry Research, 2009Co-Authors: F Garcialabiano, Luis F De Diego, P Gayan, Juan Adanez, Alberto Abad, Cristina DuesoAbstract:Chemical-looping combustion (CLC) has been suggested among the best alternatives to reduce the economic cost of CO2 capture using Fuel Gas because CO2 is inherently separated in the process. For Gaseous Fuels, natural Gas, refinery Gas, or synGas from coal Gasification can be used. These Fuels may contain different amounts of sulfur compounds, such as H2S and COS. An experimental investigation of the fate of sulfur during CH4 combustion in a 500 Wth CLC prototype using a Ni-based oxygen carrier has been carried out. The effect on the oxygen carrier behavior and combustion efficiency of several operating conditions such as temperature and H2S concentration has been analyzed. Nickel sulfide, Ni3S2, was formed at all operating conditions in the Fuel reactor, which produced an oxygen carrier deactivation and lower combustion efficiencies. However, the oxygen carrier recovered their initial reactivity after certain time without sulfur addition. The sulfides were transported to the air reactor where SO2 was pro...
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effect of Fuel Gas composition in chemical looping combustion with ni based oxygen carriers 2 fate of light hydrocarbons
Industrial & Engineering Chemistry Research, 2009Co-Authors: Juan Adanez, F Garcialabiano, Luis F De Diego, P Gayan, Cristina Dueso, Alberto AbadAbstract:Chemical-looping combustion (CLC) has been suggested among the best alternatives to reduce the economic cost of CO2 capture using Fuel Gas because CO2 is inherently separated in the process. Natural Gas or refinery Gas can be used as Gaseous Fuels, and they may contain different amounts of light hydrocarbons (LHC). The purpose of this work was to investigate the effect of the presence of light hydrocarbons (C2H6 and C3H8) in the feeding Gas of a CLC system using a nickel-based oxygen carrier prepared by impregnation on alumina. The reactivity of the oxygen carrier with light hydrocarbons and the combustion efficiency of the process were analyzed in a batch fluidized bed (FB) and a continuous CLC plant. The experiments in the batch FB showed that light hydrocarbons can be fully converted in a CLC process at temperatures above 1173 K. The influence of the Fuel reactor temperature (1073−1153 K), solid circulation flow rate (7−14 kg/h), and Gas composition was studied in a continuous CLC plant (500 Wth). Neit...
