Showing papers on "Substitute natural gas published in 2012"

A thermodynamic analysis of methanation reactions of carbon oxides for the production of synthetic natural gas

Abstract: Synthetic natural gas (SNG) can be obtained via methanation of synthesis gas (syngas). Many thermodynamic reaction details involved in this process are not yet fully understood. In this paper, a comprehensive thermodynamic analysis of reactions occurring in the methanation of carbon oxides (CO and CO2) is conducted using the Gibbs free energy minimization method. The equilibrium constants of eight reactions involved in the methanation reactions were calculated at different temperatures. The effects of temperature, pressure, ratio of H-2/CO (and H-2/CO2), and the addition of other compounds (H2O, O-2, CH4, and C2H4) in the feed gas (syngas) on the conversion of CO and CO2, CH4 selectivity and yield, as well as carbon deposition, were carefully investigated. In addition, experimental data obtained on commercial Ni-based catalysts for CO methanation and three cases adopted from the literature were compared with the thermodynamic calculations. It is found that low temperature, high pressure, and a large H-2/CO (and H-2/CO2) ratio are favourable for the methanation reactions. Adding steam into the feed gas could alleviate the carbon deposition to a large extent. Trace amounts of O-2 in syngas is unfavourable for SNG generation although it can lower carbon deposition. Additional CH4 in the feed gas almost has no influence on the CO conversion and CH4 yield, but it leads to the increase of carbon formed. Introduction of a small amount of C2H4, a representative of hydrocarbons in syngas, results in low CH4 yield and serious carbon deposition although it does not affect CO conversion. CO is relatively easy to hydrogenated compared to CO2 at the same reaction conditions. The comparison of thermodynamic calculations with experimental results demonstrated that the Gibbs free energy minimization method is significantly effective for understanding the reactions occurring in methanation and helpful for the development of catalysts and processes for the production of SNG.

Unconventional Chemistry for Unconventional Natural Gas

Abstract: Making most of our fuels and chemicals from fossil hydrocarbons is unsustainable. However, until costeffective renewable sources are developed, natural gas could provide a secure economical alternative to petroleum. Proven reserves of natural gas have doubled in the last decade (1), mainly from increases in “unconventional” gas found with shale (shale gas), coal (coal bed methane), and in low-permeability “tight” sandstones (tight gas) (see the first figure). Today, because it is not easy to convert methane into heavier molecules, natural gas (composed largely of methane) is mostly burned for heating and electrical power generation; a tiny fraction is used in vehicles. Cost-effective conversion of natural gas into higher-value chemical intermediates and liquid products could reduce our need for oil and help lower its shipping costs, which are higher than those of petroleum or coal on an energy-delivered basis. In addition, such processes might recover the large quantities of gas now flared or vented from fossil reservoirs (2).

Enhanced Investigation of CO Methanation over Ni/Al2O3 Catalysts for Synthetic Natural Gas Production

Abstract: CO methanation reaction over the Ni/Al2O3 catalysts for synthetic natural gas production was systematically investigated by tuning a number of parameters, including using different commercial Al2O3 supports and varying NiO and MgO loading, calcination temperature, space velocity, H2/CO ratio, reaction pressure, and time, respectively. The catalytic performance was greatly influenced by the above-mentioned parameters. Briefly, a large surface area of the Al2O3 support, a moderate interaction between Ni and the support Al2O3, a proper Ni content (20 wt %), and a relatively low calcination temperature (400 °C) promoted the formation of small NiO particles and reducible β-type NiO species, which led to high catalytic activities and strong resistance to the carbon deposition, while addition of a small amount of MgO (2 wt %) could improve the catalyst stability by reducing the carbon deposition; other optimized conditions that enhanced the catalytic performance included high reaction pressure (3.0 MPa), high H2...

Thermo-economic optimisation of the polygeneration of synthetic natural gas (SNG), power and heat from lignocellulosic biomass by gasification and methanation

Abstract: After a brief review of the current research on the production of synthetic natural gas (SNG) from lignocellulosic biomass by gasification and methanation, this paper presents detailed thermo-economic process optimisation of the polygeneration of SNG, power and heat. Based on a previously developed model, all suitable candidate configurations of a superstructure of promising technologies for the individual conversion steps are optimised with respect to the overall efficiency and investement cost with an evolutionary, multi-objective algorithm. In an extensive analysis, the influence of process technology, operating conditions and process integration on the thermo-economic performance is discussed and the best technology matches are determined. Systematically optimised flowsheets might thereby convert 66 to 75% of the dry wood's lower heating value to SNG while cogenerating a considerable amount of power and/or industrial heat. In order to provide a general database of optimal plant configurations, cost exponents that quantify the economies of scale are regressed, and the most profitable flowsheets are identified for different energy price scenarios and scale. A comparison with current literature on SNG production from biomass reveals the potential of applying such systematic process systems engineering approaches for the design of energy- and cost-efficient biofuel plants.

Systems and methods for producing substitute natural gas

Abstract: Systems and methods for producing synthetic gas are provided. The method can include gasifying a carbonaceous feedstock in the presence of an oxidant within a gasifier to provide a raw syngas. The raw syngas can be cooled within a cooler to provide a cooled syngas. The cooled syngas can be processed within a purification system to provide a treated syngas. The purification system can include a saturator adapted to increase a moisture content of the cooled syngas. The treated syngas and a first heat transfer medium can be introduced to a methanator to provide a synthetic gas, a second heat transfer medium, and a methanation condensate. At least a portion of the methanation condensate can be recycled from the methanator to the saturator.

Extending existing combined heat and power plants for synthetic natural gas production

Abstract: In this work, integration of a synthetic natural gas (SNG) production process with an existing biomass CHP steam power cycle is investigated. The paper assesses two different biomass feedstock drying technologies-steam drying and low-temperature air drying-for the SNG process. Using pinch technology, different levels of thermal integration between the steam power cycle and the SNG process are evaluated. The base case cold gas efficiency for the SNG process is 69.4% based on the lower heating value of wet fuel. The isolated SNG-related electricity production is increased by a factor of 2.5 for the steam dryer alternative, and tenfold for the low-temperature air dryer when increasing the thermal integration. The cold gas efficiency is not affected by the changes. Based on an analysis of changes to turbine steam flow, the integration of SNG production with an existing steam power cycle is deemed technically feasible.

Operation and results of a 200-kWth dual fluidized bed pilot plant gasifier with adsorption-enhanced reforming

Abstract: Adsorption-enhanced reforming (AER) is a calcium-based process utilizing the benefits of the reversible carbonation reaction (CaO + CO2 ⇔ CaCO3 + heat) to capture CO2 in situ in a gasifier, thereby shifting product gas distribution toward higher hydrogen yields which can be further combusted in a gas motor for electricity generation or further processed for pure hydrogen or synthetic natural gas production. Following successful EU projects and lab-scale experimentation, a 200-kWth dual fluidized bed pilot plant (consisting of an interconnected gasifier and sorbent regenerator) was designed and constructed to investigate the AER process for purposes of commercialization. The operational pilot plant is hereby described and the designed operating range presented. Detailed characterization of the gasifier and regenerator (e.g., axial temperature and pressure profiles) is shown. The facility operates in a robust manner with constant and controllable temperatures and gas concentrations. Material loss due to attrition is low and the median particle size of the bed only decreases from 450 μm (raw material) to 350 μm (bed) over many days of operation. Selected results of a long-term experiment are presented, where the gasifier temperature is held for 18 h at 650 °C, achieving an average hydrogen concentration of 72 vol% and a carbon dioxide concentration of only 5 vol%. The results from the pilot plant are consistent with previously published dual fluidized bed AER lab-scale results with respect to product gas composition, lower heating value, and tar concentration.

Is Shale Gas Good for Climate Change

Abstract: Shale gas is a new energy resource that has shifted the dominant paradigm on U.S. hydrocarbon resources. Some have argued that shale gas will play an important role in reducing greenhouse gas emissions by displacing coal used for electricity, serving as a moderate-carbon “bridge fuel.” Others have questioned whether methane emissions from shale gas extraction lead to higher greenhouse gas emissions overall. I argue that the main impact of shale gas on climate change is neither the reduced emissions from fuel substitution nor the greenhouse gas footprint of natural gas itself, but rather the competition between abundant, low-cost gas and low-carbon technologies, including renewables and carbon capture and storage. This might be remedied if the gas industry joins forces with environmental groups, providing a counterbalance to the coal lobby, and ultimately eliminating the conventional use of coal in the United States.

Greenhouse gas and energy analysis of substitute natural gas from biomass for space heat

Abstract: In this paper, the greenhouse gas and energy balances of the production and use for space heating of substitute natural gas from biomass (bio-SNG) for space heat are analysed. These balances are compared to the use of natural gas and solid biomass as wood chips to provide the same service. The reduction of the greenhouse gas emissions (CO 2 -eq.) – carbon dioxide, methane and nitrous oxide – and of the fossil primary energy use is investigated in a life cycle assessment (LCA). This assessment was performed for nine systems for bio-SNG; three types of gasification technologies (O 2 -blown entrained flow, O 2 -blown circulating fluidised bed and air–steam indirect gasification) with three different types of feedstock (forest residues, miscanthus and short rotation forestry). The greenhouse gas analysis shows that forest residues using the air–steam indirect gasification technology result in the lowest greenhouse gas emissions (in CO 2 -eq. 32 kg MWh −1 of heat output). This combination results in 80% reduction of greenhouse gas emissions when compared to natural gas and a 29% reduction of greenhouse gases if the forest residues were converted to wood chips and combusted. The gasification technologies O 2 -blown entrained flow and O 2 -blown circulating fluidised bed gasification have higher greenhouse gas emissions that range between in CO 2 -eq. 41 to 75 kg MWh −1 of heat output depending on the feedstock. When comparing feedstocks in the bio-SNG systems, miscanthus had the highest greenhouse gas emissions bio-SNG systems producing in CO 2 -eq. 57–75 kg MWh −1 of heat output. Energy analysis shows that the total primary energy use is higher for bio-SNG systems (1.59–2.13 MWh MWh −1 of heat output) than for the reference systems (in 1.37–1.51 MWh MWh −1 of heat output). However, with bio-SNG the fossil primary energy consumption is reduced compared to natural gas. For example, fossil primary energy use is reduced by 92% when air–steam indirect gasification technology and forest residues is compared to natural gas. There is no significant difference of the fossil primary energy consumption between the use of solid biomass (0.13–0.15 MWh MWh −1 of heat output) and the bio-SNG systems (0.12–0.18 MWh MWh −1 of heat output).

The agnion Heatpipe-Reformer—operating experiences and evaluation of fuel conversion and syngas composition

Abstract: Fluidized bed gasification of solid fuels is considered as one of the core technologies for future sustainable energy supply. Whereas autothermal oxygen-driven gasification is applied in large-scale substitute natural gas (SNG) and Fischer–Tropsch (FT) plants or small-scale combined heat and power (CHP) plants, the allothermal steam-reforming process of the agnion Heatpipe-Reformer is designed for cost- and fuel-efficient syngas generation at small scales for distributed applications. The Heatpipe-Reformer's pressurized syngas generation provides a number of benefits for SNG, biomass to liquid (BTL) and CHP applications. A modified gas engine concept uses the pressurized and hydrogen-rich syngas for increased performance and tar tolerance at decreased capital expenses. Agnion has installed and operated a 500-kW thermal input pilot plant in Pfaffenhofen, Germany, over the last 2 years, showing stable operation over a variety of operating points. The syngas composition has been measured at values expected by thermodynamic models. An influence of the steam-to-fuel ratio and reformer temperature was observed. Tar and sulphur contents have been monitored and correlated to operation parameters, showing influences on stoichiometry and carbon conversion. The mass and energy streams of the plant were balanced. One of the main observations in the monitoring programme is the fact that syngas output, efficiency and syngas quality correlate to high values if the carbon conversion is high. Carbon conversion rates and cold gas efficiencies are comparably high in respect to today's processes, promising economic and fuel-efficient operation of the Heatpipe-Reformer applications.

Integration Opportunities for Substitute Natural Gas (sng) Production in an Industrial Process Plant

Abstract: This paper investigates opportunities for integration of a Substitute Natural Gas (SNG) process based on thermal gasification of lignocellulosic biomass in an industrial process plant currently importing natural gas (NG) for further processing to speciality chemicals. The assumed SNG process configuration is similar to that selected for the ongoing Gothenburg Biomass Gasification demonstration project (GoBiGas) and is modelled in Aspen Plus. The heat and power integration potentials are investigated using Pinch Analysis tools. Three cases have been investigated: the steam production potential from the SNG process excess heat, the electricity production potential by maximizing the heat recovery in the SNG process without additional fuel firing, and the electricity production potential with increased steam cycle efficiency and additional fuel firing. The results show that 217 MWLHV of woody biomass are required to substitute the site’s natural gas demand with SNG (162 MWLHV). The results indicate that excess heat from the SNG process has the potential to completely cover the site’s net steam demand (19 MW) or to produce enough electricity to cover the demand of the SNG process (21 MWel). The study also shows that it is possible to fully exploit the heat pockets in the SNG process Grand Composite Curve (GCC) resulting in an increase of the steam cycle electricity output. In this case, there is a potential to cover the site’s net steam demand and to produce 30 MWel with an efficiency of 1 MWel/MWadded heat. However, this configuration requires combustion of 36 MWLHV of additional fuel, resulting in a marginal generation efficiency of 0.80 MWel/MWfuel (i.e. comparing the obtained electricity production potentials with and without additional fuel firing).

High efficiency production of substitute natural gas from biomass

Abstract: The Energy research Centre of the Netherlands (ECN) is developing technology for the production of Substitute Natural Gas (SNG) from biomass with 70% efficiency. An essential step in the process is the removal of thiophene, while benzene and toluene must be retained and converted into methane. Experimental results are presented which show that thiophene can be reduced from 10 ppmv to 0.1 ppmv by commercial hydrodesulphurization (HDS) catalysts at atmospheric pressure. The catalysts also promote the water gas shift and hydrogenation reactions. The operating temperature of 550 °C is too high and the Gas Hourly Space Velocity (GHSV) of 100 h−1 too low for practical application. Future SNG installations will operate at higher pressure, which should promote the catalytic activity at lower temperature and result in higher GHSV values. The catalyst used for conversion of benzene did work initially, but degraded within 50 h.

Bio-SNG production — concepts and their assessment

Abstract: A major goal of today’s energy policy is to establish an energy system with less greenhouse gas emissions (cf. “Renewable energy roadmap” [1]). The energetic use of biomass seems to be a very promising option to contribute to this goal: biomass can be used demand-oriented and to produce different energy carriers (e.g. power, heat and biofuels) needed within the energy system. Due to high overall efficiencies, especially the thermo-chemical conversion of solid biofuels to the natural gas substitute Bio-SNG (Synthetic Natural Gas) seems to be very promising. Therefore, it is the goal of this paper to analyse Bio-SNG production processes as a part of integrated polygeneration processes. Different Bio-SNG concepts using a gas slip stream in a gas engine or a gas turbine and process heat in an organic rankine cycle or conventional steam cycle are assessed. Based on mass and energy balances these concepts are discussed from an energetic, economic and environmental point of view. The analysis shows increasing exergetic efficiencies as well as improved economic and environmental process characteristics with increasingly integrated processes. However, the economic competitiveness still remains a bottleneck for a Bio-SNG market implementation. Therefore, two possible options to improve this competitiveness are discussed in detail.

Evidence of Scrambling over Ruthenium-based Catalysts in Supercritical-water Gasification

Abstract: Catalytic processes that employ Ru catalysts in supercritical water have been shown to be capable of converting organics, such as wood waste, into synthetic natural gas (CH4) with high efficiencies at relatively moderate temperatures of around 400 °C. However, the exact roles of the catalyst and the descriptors that would enable the search for other catalysts with high conversions have not been determined. In the current work, we use electronic structure calculations coupled with batch experiments to understand the interaction of methane (CH4) and water (H2O) with a common catalyst material, ruthenium, to understand the final steps of the methanation reaction. The calculations predict that when CH4 and H2O react with the Ru surface, the species will undergo rapid scrambling; interchanging most of the hydrogens with the surface before escaping as CH4 and H2O once again. We conducted experiments using CH4 as a feedstock in supercritical D2O (deuterated water) in the presence of a commercially available carbon-supported Ru catalyst, and found this mechanism to be confirmed: nearly all reacted CH4 was converted to the fully substituted CD4 or the 3/4-substituted CHD3 isotopomers, with less significant production of the 1/4- or 1/2-substituted species CH3D and CH2D2. The experiment was repeated with an in-house impregnated RuO2-on-carbon catalyst, with similar results. Although other criteria such as the ability to cleave CC and CO bonds and resistance to poisoning will also prove important, this study suggests that a characteristic of an effective catalyst for supercritical water gasification to methane is its ability to promote rapid equilibria through scrambling mechanisms.

Technology for preparing liquefied natural gas and liquid ammonia by using coke oven gas

Abstract: The invention discloses a technology for preparing liquefied natural gas and liquid ammonia by using coke oven gas. The coke oven gas is subjected to the steps of compression, purification, methanation, cryogenic separation and liquefaction of synthetic natural gas, variable pressure adsorptive separation and liquid ammonia preparation with hydrogen rich gas, so that the liquefied natural gas (LNG) of which methane purity is more than 99 percent and the liquid ammonia reaching national first level standard are obtained. By the technology, the hydrogen byproduct of the coke oven gas for preparing the LNG is fully utilized; effective ingredients of the coke oven gas such as H2, N2, CH4, CO and CO2 are furthest utilized; the CO and the CO2 are methanated, so that the yield of the CH4 is improved by about 1/3; the liquefied CH4 is used as the LNG and sold; and the rest nitrogen-containing hydrogen-rich gas is used as a raw material for synthesizing ammonia, so that the additional value of the coke oven gas is improved, and reliable raw material guarantee is provided for developing downstream products with high additional values and prolonging the product chain.

A methanation process of synthetic natural gas prepared from coal

Abstract: The invention discloses a methanation process of synthetic natural gas prepared from coal. Purified and decarbonized synthetic gas prepared from coal is divided into three parts, wherein the first part of the synthetic gas is fed into a first methanation reactor after being mixed with recycle air; gas at the outlet of the first methanation reactor is fed into a second methanation reactor after being mixed with the second part of the synthetic gas; gas at the outlet of the second methanation reactor is fed into a third methanation reactor after being mixed with the third part of the synthetic gas; after the gas is cooled in the third methanation reactor, a part of the gas is fed into a recycle compressor, boosted and used as the recycle gas, and the rest of the gas is sequentially fed into a fourth methanation reactor, a fifth methanation reactor or a sixth methanation reactor to be subjected to methanation; the dry basis content of methane in the gas at the outlet of the final methanation reactor is larger than 95%; and then the synthetic natural gas (SNG) meeting requirements is obtained through cooling, compressing and dehydrating. The methanation process has the advantages of small recycle gas quantity, high energy utilization rates and saved investment.

Isothermal methanation process method for coal to substitute natural gas

Abstract: The invention discloses an isothermal methanation process method for coal to substitute natural gas. Specifically, upstream purified synthetic gas enters one or more methanation reactors after fine desulfurization for undergoing a methanation reaction, and two-stage methanation is adopted in the methanation reactor(s). At a first stage, methanation is performed in one or more isothermal methanation reactors; and at a second stage, methanation is performed in a heat-insulated methanation reactor. The isothermal methanation process method has the advantages of saving in energy, environment friendliness, small investment and easiness in localization.

The Expansion of Unconventional Production of Natural Gas (Tight Gas, Gas Shale and Coal Bed Methane)

Abstract: Finding new oil reserves is becoming more and more difficult (al-Husseini, 2007). A recent study (Aleklett, 2007) alerted that global oil production has very probably passed its maximum, so the World will have reached the Peak of the Oil Age (also known as Hubbert Peak). The rate of discoveries of new oil reserves is less than the present rate of consumption, and already 5 out of every 6 oil producing countries have declining production. World natural gas proved reserves in 2010 were sufficient to meet 59 years of global production while proved oil reserves were sufficient to meet 46 years of global production (BP, 2011).

The potential of small-scale SNG production from biomass gasification

Abstract: Synthetic natural gas (SNG) can be produced from biomass by thermochemical gasification and subsequent synthesis gas methanation and gas processing. For an industrial-scale process with high efficiency (up to 74 %; Ronsch et al. in VGB PowerTech 5:110–116, 2008), the large plant size is associated with a number of disadvantages such as a high biomass transportation volume and local environmental impacts. Small distributed SNG production units would minimize these negative aspects but are expected to cause lower efficiency. In order to show the potential of a small-scale SNG solution, different process chain configurations are simulated using Aspen Plus software. Combined heat and power generation via gasification and direct product gas conversion in a gas engine is compared to a SNG route, where the product gas is further cleaned, converted, and upgraded to SNG. Different gasification technologies (co-current fixed bed, countercurrent fixed bed, and dual fluidized bed) are evaluated. The SNG route is based on a dual fluidized bed gasification, subsequent methanation, and injection into the natural gas grid. As an outcome of the simulations, the efficiencies are calculated with special focus on heat integration and utilization. A maximized utilization of the released process heat results in a strong overall efficiency increase. Depending on the local heat utilization, gasification with subsequent methanation has an advantage compared to direct local power generation. The overall efficiency of the SNG option is found to be up to 73.9 %, which is within the range of the fluidized bed gasification option. The crucial factor for high efficiency, and thus for an economic operation, is the heat demand at the location. With even a small constant heat demand, the SNG solution becomes very competitive as some of the heat otherwise generated on-site is translated into chemical energy and carried to a power generation location elsewhere. It has been shown that SNG production subsequent of a small-scale fluidized bed gasifier can very well be efficient in both energetic and economic regards. The most important and crucial parameter is the heat utilization on-site and thus the local heat demand characteristics.

Synthesis gas methanation catalyst and preparation thereof

Abstract: The invention relates to a synthesis gas methanation catalyst, which uses nickel oxide as active ingredients, uses cerium oxide modified medium-pore gamma-aluminum oxide as carriers and use oxide of transition metals of iridium, lanthanum, copper and ferrum or alkaline-earth metals of magnesium and calcium as auxiliary agents, wherein a preparation method of the medium-pore gamma-aluminum oxide adopts a hydrothermal synthesis method, and a nickel base catalyst is prepared by a soaking process, wherein the medium-pore gamma-aluminum oxide has the specific surface area being 200 to 400m /g, the pore volume being 0.2 to 0.9cm /g and the pore diameter being 2 to 15nm, the content of the active ingredients of the nickel oxide is 10 to 30 percent of the total weight of the catalyst, the content of the cerium oxide is 1 to 20 percent of the weight of the aluminum oxide, and the content of the auxiliary agents is 0.1 to 15 percent of the total weight of the catalysts. The synthesis gas methanation catalyst has the advantages that the preparation process is simple, the cerium oxide modified medium-pore gamma-aluminum oxide is used as the catalyst carriers, the obtained nickel base catalyst has good high-temperature resistance and anti-sintering resistance performance and has the advantages of high activity at low temperature, stability at high temperature and high methane selectivity, and the synthesis gas methanation catalyst has an important application value for synthesizing the substitute natural gas and solving the problem of natural gas shortage in the prior art.

Method for producing liquefied natural gas (LNG) by using semi-coke tail gas

Abstract: The invention discloses a method for producing liquefied natural gas (LNG) by using semi-coke tail gas, and belongs to the field of the preparation method of natural gas. The method sequentially comprises the following steps of: compression: the semi-coke tail gas is compressed to 0.5 to 5.5MPa; prepurification: macromolecular impurities in the semi-coke tail gas are removed to obtain roughly purified semi-coke tail gas; sulfur resistant shift: the ratio of H2, CO to CO2 in the gas is regulated and simultaneously part of organic sulfur is converted into inorganic sulfur; deep purification: sulfur and part of CO2 are removed; methanation: at least two stages of methanation reactions are adopted to obtain a methane-rich gas with methane as the key part; and cryogenic separation liquefaction of synthetic natural gas. The industrial exhaust gas, i.e. the semi-coke tail gas, can be prepared into scarce clean energy LNG in China and byproducts such as nitrogen and sulfur ointment, the purity of methane is 99%, the yield of LNG is 99%, and 99.5 % of nitrogen can be obtained, and simultaneously, high pressure steam in heat emitted by the methanation reaction can be effectively recovered.

Catalysts for High Temperature Gas Cleaning in the Production of Synthetic Natural Gas from Biomass

Abstract: Keywords: Bio-SNG ; gasification ; biomass ; sampling ; catalysis ; sulfur ; thiophene ; gas cleaning ; hydrodesulfurization ; hydrogenation ; water-gas-shift ; CoMo ; NiMo ; ruthenium ; sulfide These Ecole polytechnique federale de Lausanne EPFL, n° 5484 (2012)Programme doctoral EnergieFaculte de l'environnement naturel, architectural et construitInstitut d'ingenierie de l'environnementJury: R. Chawla (president), T.J. Schildhauer, M. Seemann, A. Wokaun Public defense: 2012-9-21 Reference doi:10.5075/epfl-thesis-5484Print copy in library catalog Record created on 2012-09-13, modified on 2016-08-09

Novel process for making synthetic natural gas by using coke-oven gas

Abstract: The invention belongs to the field of the comprehensive utilization of coke-oven gas, and discloses a novel process for making synthetic natural gas by using the coke-oven gas. The qualified synthetic natural gas product is produced by the process comprising the steps of hydrodesulfurization, carbon compensation, multi-level methanation, cooling, separation and the like. The process can effectively prevent the temperature runaway phenomenon of a methanation reactor, can reasonably distribute the load of the methanation reactor, improves the conversion rate of CO and CO2, and provides a new method for making the synthetic natural gas by using the coke-oven gas.