Operating strategies for Fischer-Tropsch reactors: A model-directed study

Song, Hyun‐Seob; Ramkrishna, Doraiswami; Trinh, Sinh; Wright, H.

doi:10.1007/bf02705414

Cited by 86 publications

(39 citation statements)

References 14 publications

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“…The number of degrees of freedom for this case is 11. Case 2c: Chain growth probability is varying along the path as a function of temperature and partial pressures of H 2 and CO based on the correlation proposed by Song et al [21]. The chain growth probability at the end of the path is 0.78 and the concentration of wax is 8.05 wt %.…”

Section: Resultsmentioning

confidence: 99%

Staging of the Fischer‐Tropsch Reactor with a Cobalt‐Based Catalyst

Rafiee

Hillestad

2013

Chem Eng & Technol

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A method for systematic reactor design, described by Hillestad [1], is applied to the Fischer-Tropsch synthesis. The reactor path is sectioned into stages and design functions are optimized to maximize an objective function. Two different objective functions are considered: the yield of wax and a measure of the profitability.With the chosen kinetic model [2] and the path temperature constrained by 240°C, staging of the Fischer-Tropsch synthesis based on the first criteria will increase the yield of wax. By introducing the cost of heat transfer area in the objective function, the total heat transfer area requirement of a two-stage reactor is significantly less than of a single-stage reactor.

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Section: Resultsmentioning

confidence: 99%

Staging of the Fischer‐Tropsch Reactor with a Cobalt‐Based Catalyst

Rafiee

Hillestad

2013

Chem Eng & Technol

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“…Next, the syngas reacts over a cobalt-based catalyst in a fixed-bed FT reactor at 200 ºC. The Anderson-Schulz-Flory alpha chain growth model described by Song et al is used to predict the FT product distribution (Song, et al 2004). After the gas is cooled, the liquid hydrocarbons and water are separated before the hydroprocessing section.…”

Section: Ft Synthesis Processmentioning

confidence: 99%

Techno-economic analysis of advanced biofuel production based on bio-oil gasification

Zhang

2015

Bioresource Technology

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This paper evaluates the economic feasibility of a hybrid production pathway combining fast pyrolysis and bio-oil gasification. The conversion process is simulated with Aspen Plus® for a 2000 t d-1 facility. Technoeconomic analysis of this fast pyrolysis and bio-oil gasification pathway has been conducted to assess the economic feasibility. A total capital investment of $438 million has been estimated and the minimum fuel selling price (MSP) is $5.6 per gallon of gasoline equivalent. The sensitivity analysis shows that the MSP is most sensitive to internal rate of return, fuel yield, biomass feedstock cost, and fixed capital investment. Monte-Carlo simulation shows that MSP for bio-oil gasification would be more than $6/gal with a probability of 0.24, which indicates this pathway is still at high risk with current economic situation. Keywords techno-economic analysis, bio-oil gasification, fast pyrolysis, Mechanical Engineering Disciplines Industrial Engineering | Mechanical Engineering | Systems EngineeringComments NOTICE: This is the author's version of a work that was accepted for publication in Bioresource Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive versionwas subsequently published in Bioresource Technology, 191, 2015, doi AbstractThis paper evaluates the economic feasibility of a hybrid production pathway combining fast pyrolysis and bio-oil gasification. The conversion process is simulated with Aspen Plus ® for a 2000 t d -1 facility. Techno-economic analysis of this fast pyrolysis and bio-oil gasification pathway has been conducted to assess the economic feasibility. A total capital investment of $438 million has been estimated and the minimum fuel selling price (MSP) is $5.6 per gallon of gasoline equivalent. The sensitivity analysis shows that the MSP is most sensitive to internal rate of return, fuel yield, biomass feedstock cost, and fixed capital investment. Monte-Carlo simulation shows that MSP for bio-oil gasification would be more than $6/gal with a probability of 0.24, which indicates this pathway is still at high risk with current economic situation.

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“…A basic Fortran expression was written in Aspen Plus that estimates the α ASF value based on the syngas feed parameters and reactor operating conditions using the alpha correlation parameter developed by Song et al ., as shown in Eqn .

α_{A S F} = ([], 0.2332 \frac{y_{c o}}{y_{H 2}} + 0.663) ([], 1 - 0.0039 ((), T - 533))

…”

Section: Methodsmentioning

confidence: 99%

Techno‐economic assessment of biogas to liquid fuels conversion technology via Fischer‐Tropsch synthesis

Okeke

Mani

2017

Biofuels Bioprod Bioref

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Biogas derived from anaerobic digestion of organic wastes, and lignocellulosic biomass can be used to produce drop-in diesel fuel via Fischer-Tropsch (FT) synthesis. In this study, we developed a process-based simulation model for the biogas to liquid fuel (BgTL) plant to conduct mass and energy balances and to evaluate techno-economic assessment of producing drop-in FT fuels. The BgTL plant operations consisted of biogas cleaning, biomethane reforming, FT synthesis of syngas and hydrocracking and fi nal distillation to produce drop-in liquid fuels. The unconverted syngas and syncrude were utilized to generate steam and electricity to meet internal plant demand, while the excess power was sold to the grid. The base case BgTL plant (2 000 Nm 3 /h) produced about 4.6 million gallons per annum of total FT fuels which consisted of 62% diesel, 32% gasoline, 6% LPG with an overall biogas conversion of 54%. A discounted cash fl ow rate of return (DCFOROR) approach for the Nth plant was used to estimate the capital and operating costs with the minimum selling price for the FT drop-in fuels of about $5.67/gal ($5.29/GGE). The increase in plant feed capacity to 20 000 Nm 3 /h decreased the minimum selling price to $2.06/gal ($1.92/GGE). The sensitivity analysis conducted on the base case plant demonstrated that the internal rate of return (IRR), FT conversion rate, plant operating hours, and biogas cost were the most sensitivity parameters to the minimum selling price. Overall, the BgTL technology is deemed to be economically feasible to meet US biofuels demand.

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Operating strategies for Fischer-Tropsch reactors: A model-directed study

Cited by 86 publications

References 14 publications

Staging of the Fischer‐Tropsch Reactor with a Cobalt‐Based Catalyst

Staging of the Fischer‐Tropsch Reactor with a Cobalt‐Based Catalyst

Techno-economic analysis of advanced biofuel production based on bio-oil gasification

Techno‐economic assessment of biogas to liquid fuels conversion technology via Fischer‐Tropsch synthesis

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