The Experts below are selected from a list of 8067 Experts worldwide ranked by ideXlab platform
Atsushi Tsutsumi - One of the best experts on this subject based on the ideXlab platform.
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advanced energy saving in the reaction section of the hydro desulfurization process with self heat recuperation technology
Applied Thermal Engineering, 2010Co-Authors: Kazuo Matsuda, Yasuki Kansha, Kenichi Kawazuishi, Yoshiichi Hirochi, Rei Sato, Chihiro Fushimi, Yutaka Shikatani, Hiroshi Kunikiyo, Atsushi TsutsumiAbstract:Abstract The reaction section of the naphtha hydro-desulfurization (HDS) process is a heating and cooling thermal process consisting of a feed/Effluent heat exchanger and a fired heater. Energy savings are fundamentally made as a result of the maximized heat recovery in the heat exchanger and the reduced heat duty of the fired heater. To achieve further energy saving in the process, “self-heat recuperation technology” (SHRT) was adopted. In this technology, a compressor was introduced. The suction side of the compressor needed a lower pressure and the feed Stream evaporated much easily. The discharged side of the compressor satisfied the operating conditions of both pressure and temperature at the inlet of the reactor. And the reactor Effluent Stream was able to be used completely to preheat and vaporize the feed Stream. All the heat in the process Stream was re-circulated without using a fired heater. SHRT was applied to the naphtha HDS process of 18,000 barrel per Stream day (BPSD) in the refinery and the mass and energy balance of the process was calculated using commercially available simulation software, Invensys PROII version 8.1. This process-simulation case study confirmed that despite there being no more energy saving potential in the conventional process that makes use of a fired heater, the advanced process with SHRT can reduce the energy consumption significantly by using the recuperated heat of the feed Stream.
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self heat recuperation technology for energy saving in chemical processes
Industrial & Engineering Chemistry Research, 2009Co-Authors: Yasuki Kansha, Chihiro Fushimi, Naoki Tsuru, Kazuyoshi Sato, Atsushi TsutsumiAbstract:An innovative self-heat recuperation technology has been developed for heating and cooling thermal processes, in which not only latent heat but also sensible heat are circulated in a feed−Effluent heat exchanger of the thermal process by compressing the Effluent Stream without any heat addition. Applying this technology to the thermal processes, the amount of energy required was determined using a commercial process simulation tool, PROII. The proposed self-heat recuperation technology, in which the heat of an Effluent Stream is recuperated and reused for feed Stream heating by gas and/or vapor recompression, was found to drastically reduce the energy consumption.
Goetz Veser - One of the best experts on this subject based on the ideXlab platform.
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chemical looping to combustion and beyond
Catalysis Today, 2014Co-Authors: Saurabh Bhavsar, Michelle Najera, Rahul Solunke, Goetz VeserAbstract:Abstract Chemical looping combustion (CLC) is a rapidly emerging technology for clean combustion of fossil and renewable fuels which allows production of sequestration-ready CO 2 Streams with only minor efficiency penalties for CO 2 capture. While initial interest in chemical looping was almost exclusively focused on combustion, we demonstrate here that the underlying reaction engineering principle forms a highly flexible platform for fuel conversion: Replacing air with steam or CO 2 as oxidizer yields the chemical looping analogue to steam and dry reforming, resulting in the production of high purity hydrogen Streams without the need for further clean-up steps and a novel route for efficient CO 2 activation via reduction to CO, respectively. Furthermore, by controlling the degree of carrier oxidation, incomplete, i.e. partial oxidation of the fuel to synthesis gas is attained. Finally, appropriate selection of oxygen carrier materials even allows simultaneous desulfurization of the Effluent Stream, resulting in a strongly intensified process for highly efficient, low-emission conversion of S-contaminated fuel Streams. Based on new results from our own research, the present paper presents a brief overview over the potential of chemical looping processes for methane conversion with a particular focus on the key role of engineered carrier materials as enablers for this class of processes.
Yasuki Kansha - One of the best experts on this subject based on the ideXlab platform.
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advanced energy saving in the reaction section of the hydro desulfurization process with self heat recuperation technology
Applied Thermal Engineering, 2010Co-Authors: Kazuo Matsuda, Yasuki Kansha, Kenichi Kawazuishi, Yoshiichi Hirochi, Rei Sato, Chihiro Fushimi, Yutaka Shikatani, Hiroshi Kunikiyo, Atsushi TsutsumiAbstract:Abstract The reaction section of the naphtha hydro-desulfurization (HDS) process is a heating and cooling thermal process consisting of a feed/Effluent heat exchanger and a fired heater. Energy savings are fundamentally made as a result of the maximized heat recovery in the heat exchanger and the reduced heat duty of the fired heater. To achieve further energy saving in the process, “self-heat recuperation technology” (SHRT) was adopted. In this technology, a compressor was introduced. The suction side of the compressor needed a lower pressure and the feed Stream evaporated much easily. The discharged side of the compressor satisfied the operating conditions of both pressure and temperature at the inlet of the reactor. And the reactor Effluent Stream was able to be used completely to preheat and vaporize the feed Stream. All the heat in the process Stream was re-circulated without using a fired heater. SHRT was applied to the naphtha HDS process of 18,000 barrel per Stream day (BPSD) in the refinery and the mass and energy balance of the process was calculated using commercially available simulation software, Invensys PROII version 8.1. This process-simulation case study confirmed that despite there being no more energy saving potential in the conventional process that makes use of a fired heater, the advanced process with SHRT can reduce the energy consumption significantly by using the recuperated heat of the feed Stream.
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self heat recuperation technology for energy saving in chemical processes
Industrial & Engineering Chemistry Research, 2009Co-Authors: Yasuki Kansha, Chihiro Fushimi, Naoki Tsuru, Kazuyoshi Sato, Atsushi TsutsumiAbstract:An innovative self-heat recuperation technology has been developed for heating and cooling thermal processes, in which not only latent heat but also sensible heat are circulated in a feed−Effluent heat exchanger of the thermal process by compressing the Effluent Stream without any heat addition. Applying this technology to the thermal processes, the amount of energy required was determined using a commercial process simulation tool, PROII. The proposed self-heat recuperation technology, in which the heat of an Effluent Stream is recuperated and reused for feed Stream heating by gas and/or vapor recompression, was found to drastically reduce the energy consumption.
Saurabh Bhavsar - One of the best experts on this subject based on the ideXlab platform.
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chemical looping to combustion and beyond
Catalysis Today, 2014Co-Authors: Saurabh Bhavsar, Michelle Najera, Rahul Solunke, Goetz VeserAbstract:Abstract Chemical looping combustion (CLC) is a rapidly emerging technology for clean combustion of fossil and renewable fuels which allows production of sequestration-ready CO 2 Streams with only minor efficiency penalties for CO 2 capture. While initial interest in chemical looping was almost exclusively focused on combustion, we demonstrate here that the underlying reaction engineering principle forms a highly flexible platform for fuel conversion: Replacing air with steam or CO 2 as oxidizer yields the chemical looping analogue to steam and dry reforming, resulting in the production of high purity hydrogen Streams without the need for further clean-up steps and a novel route for efficient CO 2 activation via reduction to CO, respectively. Furthermore, by controlling the degree of carrier oxidation, incomplete, i.e. partial oxidation of the fuel to synthesis gas is attained. Finally, appropriate selection of oxygen carrier materials even allows simultaneous desulfurization of the Effluent Stream, resulting in a strongly intensified process for highly efficient, low-emission conversion of S-contaminated fuel Streams. Based on new results from our own research, the present paper presents a brief overview over the potential of chemical looping processes for methane conversion with a particular focus on the key role of engineered carrier materials as enablers for this class of processes.
Fernando Rubiera - One of the best experts on this subject based on the ideXlab platform.
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Production of fuel-cell grade H2 by sorption enhanced steam reforming of acetic acid as a model compound of biomass-derived bio-oil
Applied Catalysis B: Environmental, 2016Co-Authors: María V. Gil, Javier Fermoso, De Chen, Covadonga Pevida, Fernando RubieraAbstract:Fuel-cell grade H2 has been produced by the sorption enhanced steam reforming (SESR) of acetic acid, a model compound of the bio-oil obtained from the fast pyrolysis of biomass. A Pd/Ni-Co catalyst derived from a hydrotalcite-like material (HT) with dolomite as CO2 sorbent was used in the process. A fixed-bed reactor with three temperature zones was employed to favor the catalytic steam reforming reaction in the high-temperature segment, the SESR reaction in the intermediate-temperature part, as well as the water-gas shift (WGS) and CO2 capture reactions in the low-temperature segment. Different conditions of pressure, temperature, steam/C molar ratio and weight hourly space velocity (WHSV) in the feed were evaluated. Higher steam/C molar ratios and lower WHSV values facilitated the production of H2 and reduced the concentrations of CH4, CO and CO2 in the produced gas. A fuel-cell grade H2 Stream with a H2 purity of 99.8vol.% and H2 yield of 86.7% was produced at atmospheric pressure, with a steam/C ratio of 3, a WHSV of 0.893h-1 and a temperature of 575°C in the intermediate part of the reactor (675°C in the upper segment and 425°C in the bottom part). At high pressure conditions (15atm) a maximum H2 concentration of 98.31vol.% with a H2 yield of 79.81% was obtained at 725°C in the intermediate segment of the reactor (825°C in the upper segment and 575°C in the bottom part). Under these conditions an Effluent Stream with a CO concentration below 10ppm (detection limit) was obtained at both low and high pressure, making it suitable for direct use in fuel cell applications.
