Fe-substituted Ba-hexaaluminates oxygen carrier for carbon dioxide capture by chemical looping combustion of methane

AIChE Journal ◽  
2015 ◽  
Vol 62 (3) ◽  
pp. 792-801 ◽  
Author(s):  
Ming Tian ◽  
Xiaodong Wang ◽  
Xin Liu ◽  
Aiqin Wang ◽  
Tao Zhang
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Capture ◽  
Oxygen Carrier ◽  
Chemical Looping Combustion ◽  
Chemical Looping

Chemical-Looping Combustion of Hard Coal: Autothermal Operation of a 1 MWth Pilot Plant

2016 ◽  
Vol 138 (4) ◽  
Author(s):  
Peter Ohlemüller ◽  
Jan-Peter Busch ◽  
Michael Reitz ◽  
Jochen Ströhle ◽  
Bernd Epple
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Capture ◽  
Oxygen Carrier ◽  
Air Separation ◽  
Capture Efficiency ◽  
Chemical Looping Combustion ◽  
Hard Coal ◽  
Chemical Looping ◽  
Separation Unit ◽  
Autothermal Operation

Chemical-looping combustion (CLC) is an emerging carbon capture technology that is characterized by a low energy penalty, low carbon dioxide capture costs, and low environmental impact. To prevent the contact between fuel and air, an oxygen carrier is used to transport the oxygen needed for fuel conversion. In comparison to a classic oxyfuel process, no air separation unit is required to provide the oxygen needed to burn the fuel. The solid fuel, such as coal, is gasified in the fuel reactor (FR), and the products from gasification are oxidized by the oxygen carrier. There are promising results from the electrically heated 100 kWth unit at Chalmers University of Technology (Sweden) or the 1 MWth pilot at Technische Universität Darmstadt (Germany) with partial chemical-looping conditions. The 1 MWth CLC pilot consists of two interconnected circulating fluidized bed reactors. It is possible to investigate this process without electrically heating due to refractory-lined reactors and coupling elements. This work presents the first results of autothermal operation of a metal oxide CLC unit worldwide using ilmenite as oxygen carrier and coarse hard coal as fuel. The FR was fluidized with steam. The results show that the oxygen demand of the FR required for a complete conversion of unconverted gases was in the range of 25%. At the same time, the carbon dioxide capture efficiency was low in the present configuration of the 1 MWth pilot. This means that unconverted char left the FR and burned in the air reactor (AR). The reason for this is that no carbon stripper unit was used during these investigations. A carbon stripper could significantly enhance the carbon dioxide capture efficiency.

scholarly journals Development of Multimode Gas Fired Combined Cycle Chemical-Looping Combustion Based Power Plant Lay-Outs

2021 ◽  
Author(s):  
Basavaraja Revappa Jayadevappa
Keyword(s):  
Carbon Dioxide ◽  
Power Plant ◽  
Natural Gas ◽  
Flue Gas ◽  
Power Plants ◽  
Carbon Dioxide Capture ◽  
Combined Cycle ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Operating Pressure

Abstract Operation of power plants in carbon dioxide capture and non-capture modes and energy penalty or energy utilization in such operations are of great significance. This work reports on two gas fired pressurized chemical-looping combustion power plant lay-outs with two inbuilt modes of flue gas exit namely, with carbon dioxide capture mode and second mode is letting flue gas (consists carbon dioxide and water) without capturing carbon dioxide. In the non-CCS mode, higher thermal efficiencies of 54.06% and 52.63% efficiencies are obtained with natural gas and syngas. In carbon capture mode, a net thermal efficiency of 52.13% is obtained with natural gas and 48.78% with syngas. The operating pressure of air reactor is taken to be 13 bar for realistic operational considerations and that of fuel reactor is 11.5 bar. Two power plant lay-outs developed based combined cycle CLC mode for natural gas and syngas fuels. A single lay-out is developed for two fuels with possible retrofit for dual fuel operation. The CLC Power plants can be operated with two modes of flue gas exit options and these operational options makes them higher thermal efficient power plants.

Coprecipitated, Copper-Based, Alumina-Stabilized Materials for Carbon Dioxide Capture by Chemical Looping Combustion

ChemSusChem ◽  
2012 ◽  
Vol 5 (8) ◽  
pp. 1610-1618 ◽  
Author(s):  
Qasim Imtiaz ◽  
Agnieszka Marta Kierzkowska ◽  
Christoph Rüdiger Müller
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Capture ◽  
Chemical Looping Combustion ◽  
Chemical Looping

Advances in Chemical-Looping Combustion for Solid Fuels

2013 ◽  
Vol 316-317 ◽  
pp. 99-104 ◽  
Author(s):  
Ming Luo ◽  
Shu Zhong Wang ◽  
Long Fei Wang
Keyword(s):  
Carbon Dioxide ◽  
Oxygen Carrier ◽  
Combustion Efficiency ◽  
Chemical Looping Combustion ◽  
Solid Fuels ◽  
Chemical Looping ◽  
Oxygen Carriers ◽  
Technical Problems ◽  
Solid Coal ◽  
Recent Advances

Chemical-looping combustion (CLC) is a new method for the combustion of fuels with inherent separation of carbon dioxide, which can simultaneously improve combustion efficiency and reduce environmental pollution. Since solid coal is considerably more abundant than natural gas, it would be highly advantageous if the CLC process could be adapted for solid fuels. The present review introduces the technical approaches for the solid fuels CLC process, and the existing technical problems in solid fuels CLC are discussed. The demands in oxygen carriers of chemical looping combustion for solid fuels are analyzed, and the recent advances in metal oxides oxygen carriers (Cu-, Ni- and Fe-based) and calcium based oxygen carrier are summarized. The recent advances in reactor design are outlined. The main problems in reactor deign are mentioned and the relative measures are pointed.

Experimental Study on Coal Chemical Looping Combustion Using CuFe2O4 as Oxygen Carrier

2013 ◽  
Vol 805-806 ◽  
pp. 1387-1390
Author(s):  
Lei Wang ◽  
Wu Qin ◽  
Ling Nan Wu ◽  
Xue Qing Hu ◽  
Ming Zhong Gao ◽  
...  
Keyword(s):  
Carbon Dioxide Capture ◽  
Oxygen Carrier ◽  
Raw Material ◽  
Bet Surface Area ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Sem Images ◽  
X Ray ◽  
Thermogravimetric Analyzer ◽  
The Cost

Chemical-looping combustion (CLC) has been proposed as an efficient and clean technology that could contribute to achieve carbon dioxide capture with negligible cost. The technology uses a metal oxide as oxygen carrier that indirectly transfer oxygen from air to fuels to oxidize the fuels. CuFe2O4 was prepared as a novel oxygen carrier to decrease the cost of raw material and increase the reactivity of iron-based oxygen carrier. The structure of the prepared oxygen carrier was characterized by scanning electron microscope (SEM) and an X-ray diffractometer (XRD). The reaction of CuFe2O4 with coal was tested in a thermogravimetric analyzer (TGA). Results showed that the pyrolysis of coal under CO2 was more complete than that under N2, and the final conversion of CuFe2O4 during CLC of coal reached 66.6%. SEM images and BET surface area of the fresh and the used oxygen carrier show little agglomeration during the process.

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