Integration of an Electrolysis Unit for Producer Gas Conditioning in a Bio-Synthetic Natural Gas Plant

2018 ◽  
Vol 141 (1) ◽  
Author(s):  
Sennai Mesfun ◽  
Joakim Lundgren ◽  
Andrea Toffolo ◽  
Göran Lindbergh ◽  
Carina Lagergren ◽  
...  
Keyword(s):  
Natural Gas ◽  
Economic Indicator ◽  
Biomass Gasification ◽  
Producer Gas ◽  
Molten Carbonate ◽  
Operational Parameters ◽  
Synthetic Natural Gas ◽  
Electrolysis Cells ◽  
Gas Conditioning ◽  
The Impact

Producer gas from biomass gasification contains impurities like tars, particles, alkali salts, and sulfur/nitrogen compounds. As a result, a number of process steps are required to condition the producer gas before utilization as a syngas and further upgrading to final chemicals and fuels. Here, we study the concept of using molten carbonate electrolysis cells (MCEC) both to clean and to condition the composition of a raw syngas stream, from biomass gasification, for further upgrading into synthetic natural gas (SNG). A mathematical MCEC model is used to analyze the impact of operational parameters, such as current density, pressure and temperature, on the quality and amount of syngas produced. Internal rate of return (IRR) is evaluated as an economic indicator of the processes considered. Results indicate that, depending on process configuration, the production of SNG can be boosted by approximately 50–60% without the need of an additional carbon source, i.e., for the same biomass input as in standalone operation of the GoBiGas plant.

Digester Gas Upgrading to Synthetic Natural Gas in Solid Oxide Electrolysis Cells

2015 ◽  
Vol 29 (3) ◽  
pp. 1641-1652 ◽  
Author(s):  
Guido Lorenzi ◽  
Andrea Lanzini ◽  
Massimo Santarelli
Keyword(s):  
Natural Gas ◽  
Solid Oxide ◽  
Synthetic Natural Gas ◽  
Electrolysis Cells ◽  
Solid Oxide Electrolysis ◽  
Solid Oxide Electrolysis Cells

Fluidized Bed Methanation of Wood-Derived Producer Gas for the Production of Synthetic Natural Gas

2010 ◽  
Vol 49 (21) ◽  
pp. 11119-11119 ◽  
Author(s):  
Martin C. Seemann ◽  
Tilman J. Schildhauer ◽  
Serge M. A. Biollaz
Keyword(s):  
Natural Gas ◽  
Fluidized Bed ◽  
Producer Gas ◽  
Synthetic Natural Gas

The Efficiencies of Internal Reforming Molten Carbonate Fuel Cell Fueled by Natural Gas and Synthetic Natural Gas From Coal

2016 ◽  
Vol 13 (1) ◽  
Author(s):  
Hai-Kyung Seo ◽  
Won-shik Park ◽  
Hee Chun Lim
Keyword(s):  
Fuel Cell ◽  
Natural Gas ◽  
Steam Turbine ◽  
Molten Carbonate Fuel Cell ◽  
Molten Carbonate ◽  
Lower Efficiency ◽  
Capture Process ◽  
Synthetic Natural Gas ◽  
Internal Reforming ◽  
Carbonate Fuel Cell

When synthetic natural gas (SNG) is produced from coal and used as a fuel in the internal reforming molten carbonate fuel cell (ir-MCFC), electric efficiency can be no greater than 31%. This is because there are several exothermic reactions in the processes of converting coal to SNG, so that a maximum 64% of coal's energy is converted into SNG energy. This results in a lower efficiency than when the ir-MCFC with the electric efficiency of 48% is fueled by natural gas (NG). To increase electric efficiency with SNG, it is necessary to recover the exothermic heat generated from the processes of converting coal to SNG as steam, which can then be used in a steam turbine. When steam produced in the gasification, water gas shift (WGS), and methanation processes is used in a steam turbine, the gross electric efficiency will become 41%. If the steam and auxiliary power for CO2 capture process is consumed more, the net efficiency will be 27%. Use of additional steam from the exhausted gas of fuel cell can increase the total net efficiency to 49%.

Steam Biomass Gasification - Effect of Temperature

2016 ◽  
Vol 832 ◽  
pp. 49-54 ◽  
Author(s):  
Marek Baláš ◽  
Martin Lisý ◽  
Jiří Pospíšil
Keyword(s):  
Negative Impact ◽  
Common Knowledge ◽  
Calorific Value ◽  
Biomass Gasification ◽  
Transformation Process ◽  
Effect Of Temperature ◽  
Producer Gas ◽  
Gaseous Fuels ◽  
Gasification Process ◽  
The Impact

Gasification is one of the technologies for utilization of biomass. Gasification is a transformation process that converts solid fuels into gaseous fuels. The gaseous fuel may be subsequently applied in other technologies with all the benefits that gaseous fuels provide. The principle of biomass gasification is a common knowledge. It is thermochemical decomposition oof the fuel in presence of gasification agent. Heat from the endothermic reaction is obtained by a partial combustion of the fuel (autothermal gasification) or the heat is supplied into a gasifier from the outside (allothermal gasification). Oxygen for the partial combustion is supplied in the gasification medium. Quality, composition and amount of the producer gas depend on many factors which include type of the gasifier, operating temperature and pressure, fuel properties (moisture content) and type and amount of gasification medium. Commonly, air, steam and oxygen and their combinations are used as a gasification medium. Every kind of gasification agents has its significant advantages and disadvantages.Research and analysis of the gasification process must pay special attention to all operating parameters which affect quality and amount of the producer gas that is the efficiency of the conversion itself. Composition of the producer gas, calorific value, and content and composition of impurities are especially observed as these are the basic characteristics directly affecting subsequent application of the gas. Steam addition has a significant impact on gas composition. Steam decomposition into hydrogen and oxygen, and their subsequent reactions increases amount of combustibles, hydrogen, methane and other hydrocarbons. Steam addition in the gasification also affects amount and composition of tar and has a negative impact on heat balance.Energy Institute at the Brno University of Technology has a long tradition in research of biomass gasification in atmospheric fluidized bed reactors. Air was used as a gasification medium. This paper describes our experience with gasification using a mixture of air and steam. We analysed the whole process and in this paper we wish to describe the impact of temperature on outputs of the process, especially temperature of leaving steam and temperature of gasification reactions.

scholarly journals Combining Dual Fluidized Bed and High-Temperature Gas-Cooled Reactor for Co-Producing Hydrogen and Synthetic Natural Gas by Biomass Gasification

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5683
Author(s):  
Yangping Zhou ◽  
Zhengwei Gu ◽  
Yujie Dong ◽  
Fangzhou Xu ◽  
Zuoyi Zhang
Keyword(s):  
High Temperature ◽  
Natural Gas ◽  
Fluidized Bed ◽  
Biomass Gasification ◽  
Production Costs ◽  
Auxiliary Heating ◽  
Synthetic Natural Gas ◽  
Product Gas ◽  
Dual Fluidized Bed ◽  
High Temperature Gas

Biomass gasification to produce burnable gas now attracts an increasing interest for production flexibility in the renewable energy system. However, the biomass gasification technology using dual fluidized bed which is most suitable for burnable gas production still encounters problems of low production efficiency and high production cost. Here, we proposed a large-scale biomass gasification system to combine dual fluidized bed and high-temperature gas-cooled reactor (HTR) for co-production of hydrogen and synthetic natural gas (SNG). The design of high-temperature gas-cooled reactor biomass gasification (HTR-BiGas) consists of one steam supply module to heat inlet steam of the gasifier by HTR and ten biomass gasification modules to co-produce 2000 MWth hydrogen and SNG by gasifying the unpretreated biomass. Software for calculating the mass and energy balances of biomass gasification was developed and validated by the experiment results on the Gothenburg biomass gasification plant. The preliminary economic evaluation showed that HTR-BiGas and the other two designs, electric auxiliary heating and increasing recirculated product gas, are economically comparative with present mainstream production techniques and the imported natural gas in China. HTR-BiGas is the best, with production costs of hydrogen and SNG around 1.6 $/kg and 0.43 $/Nm3, respectively. These designs mainly benefit from proper production efficiencies with low fuel-related costs. Compared with HTR-BiGas, electric auxiliary heating is hurt by the higher electric charge and the shortcoming of increasing recirculated product gas is its lower total production. Future works to improve the efficiency and economy of HTR-BiGas and to construct related facilities are introduced.

scholarly journals Life cycle Assessment of Hydrogen Production via Natural Gas Steam Reforming vs. Biomass Gasification

2022 ◽  
Author(s):  
Peiran Zhao ◽  
Abbas Tamadon ◽  
Dirk Pons
Keyword(s):  
Life Cycle ◽  
Hydrogen Production ◽  
Natural Gas ◽  
Environmental Impact ◽  
Greenhouse Gas ◽  
Steam Reforming ◽  
Greenhouse Gas Emission ◽  
Biomass Gasification ◽  
Silica Sand ◽  
The Impact

CONTEXT– Energy is widely involved in human activity and corresponding emissions of SOX, NOX and CO2 from energy generation processes affect global climate change. Clean fuels are desired by society because of their reduced greenhouse gas emissions. Hydrogen is once such candidate fuel. Much hydrogen is produced from fossil fuel, with biomass being an alternative process. OBJECTIVE– The project compared the environmental impact of hydrogen production by natural gas steam reforming vs. biomass gasification. METHOD–Environmental impact was calculated from the input and output data from life cycle inventory analysis. The impact assessment was focused on greenhouse gas emission, acidification, and eutrophication. Models of the two processes were developed and analysed in OpenLCA. The agribalyse database was used to connect inventory flow data to environmental impacts. FINDINGS– For all three metrics, biomass gasification had lower impacts than natural gas steam reforming, sometimes by large margins. For biomass gasification the silica sand production contributes most to all three impact categories, whereas for natural gas steam reforming it is the LPG extraction.

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