Integrated gasification combined cycle (IGCC) process simulation and optimization

Emun, F.; Gadalla, Mamdouh A.; Majozi, Thokozani; Boer, Dieter

doi:10.1016/j.compchemeng.2009.04.007

Cited by 181 publications

(40 citation statements)

References 9 publications

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“…(1) the model is steady state, kinetic free and isothermal; (2) chemical reactions take place at an equilibrium state in the gasifier, and there is no pressure loss; (3) all elements except sulphur contact at uniformly and take part in the chemical reaction; (4) all gases are ideal gases, including H 2 , CO, CO 2 , steam (H 2 O), N 2 and CH 4 ; (5) char contains volatile matters composed of carbon, H 2 and O 2 ; (6) tars are assumed as non-equilibrium products to reduce the hydrodynamic complexity [13].…”

Section: Assumptionsmentioning

confidence: 99%

Performance Analysis of an Integrated Fixed Bed Gasifier Model for Different Biomass Feedstocks

et al. 2013

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Abstract:Energy recovery from biomass by gasification technology has attracted significant interest because it satisfies a key requirement of environmental sustainability by producing near zero emissions. Though it is not a new technology, studies on its integrated process simulation and analysis are limited, in particular for municipal solid waste (MSW) gasification. This paper develops an integrated fixed bed gasifier model of biomass gasification using the Advanced System for Process ENngineering (Aspen) Plus software for its performance analysis. A computational model was developed on the basis of Gibbs free energy minimization. The model is validated with experimental data of MSW and food waste gasification available in the literature. A reasonable agreement between measured and predicted syngas composition was found. Using the validated model, the effects of operating conditions, namely air-fuel ratio and gasifier temperature, on syngas production are studied. Performance analyses have been done for four different feedstocks, namely wood, coffee bean husks, green wastes and MSWs. The ultimate and proximate analysis data for each feedstock was used for model development. It was found that operating parameters have a significant influence on syngas composition. An air-fuel ratio of 0.3 and gasifier temperature of 700 °C provides optimum performance for a fixed bed gasifier for MSWs, wood wastes, green wastes and coffee bean husks. The developed model can be useful for gasification of other biomasses (e.g., food wastes, rice husks, poultry wastes and OPEN ACCESSEnergies 2013, 6 6509 sugarcane bagasse) to predict the syngas composition. Therefore, the study provides an integrated gasification model which can be used for different biomass feedstocks.

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Section: Assumptionsmentioning

confidence: 99%

Performance Analysis of an Integrated Fixed Bed Gasifier Model for Different Biomass Feedstocks

et al. 2013

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“…This thermodynamic model was chosen as it provides high accuracy in water-hydrocarbon systems over a wide range of temperatures and predicts the instability of the liquid phase [31]. Additionally, the HCOALGEN and DCOALIGT models were used to calculate enthalpy and density for coal and ash (non-conventional components) [13].…”

Section: Physical Property Methodsmentioning

confidence: 99%

“…Table 2 summarizes key parameters for these gasification technologies. Among these processes, entrained-flow gasification is the commercially preferred technology due to its versatility and lower environmental impact [4,12,13,19]. Many commercial technologies in entrained-flow gasification reactors are available nowadays such as the GE/Texaco, Shell and ConocoPhillips ones.…”

Section: Gasification Technologiesmentioning

confidence: 99%

“…It also can be used to model steady state processes handling solid carbons materials in multiple unit operations. Therefore, many coal and biomass conversion processes have been simulated using Aspen Plus as integrated coal gasification combined cycle (IGCC) power plant [13], biomass gasification [14], hybrid biomass gasification [15], hydrogen production from biomass gasification [16] and coal combustion [17]. Additionally, proximate and ultimate analysis properties of solid coal are specified to provide a fairly rigorous simulation of the gasifier performance [18].…”

Section: Introductionmentioning

confidence: 99%

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Simulation of Synthesis Gas Production from Steam Oxygen Gasification of Colombian Coal Using Aspen Plus®

et al. 2012

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Abstract:A steady state simulation of syngas production from a Steam Oxygen Gasification process using commercial technologies was performed using Aspen Plus ® . For the simulation, the average proximate and ultimate compositions of bituminous coal obtained from the Colombian Andean region were employed. The simulation was applied to conduct sensitivity analyses in the O 2 to coal mass ratio, coal slurry concentration, WGS operating temperature and WGS steam to dry gas molar ratio (SDG) over the key parameters: syngas molar composition, overall CO conversion in the WGS reactors, H 2 rich-syngas lower heating value (LHV) and thermal efficiency. The achieved information allows the selection of critical operating conditions leading to improve system efficiency and environmental performance. The results indicate that the oxygen to carbon ratio is a key variable as it affects significantly both the LHV and thermal efficiency. Nevertheless, the process becomes almost insensitive to SDG values higher than 2. Finally, a thermal efficiency of 62.6% can be reached. This result corresponds to a slurry solid concentration of 0.65, a WGS process SDG of 0.59, and a LTS reactor operating temperature of 473 K. With these fixed variables, a syngas with H 2 molar composition of 92.2% and LHV of 12 MJ Nm

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“…A thermodynamic model of a combustion power plant was also developed with ASPEN Plus to evaluate the thermodynamic feasibility of the cogeneration with a higher ratio of electricity to heat. Using ASPEN Plus, Emun et al (2010) simulated a CIGCC, and pointed out that the overall energy efficiency can approach to 45%. Eriksson and Kjellström (2010) performed a techno-economic analysis over a CHP process integrated into a wood-based ethanol production process.…”

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confidence: 99%

Techno-economic evaluation of a mechanical pulp mill with gasification

Engstrand

Björkqvist

et al. 2013

Nordic Pulp &Amp; Paper Research Journal

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SUMMARY: Mechanical pulping processes, including thermomechanical pulp (TMP), groundwood (SGW and PGW), and chemithermomechanical pulp (CTMP) processes, each have a very high wood-to-pulp yield. Producing pulp by means of these processes is a prerequisite for paper (such as printing paper and paperboard) grades requiring high printability and stiffness. However, mechanical pulping processes consume a great amount of electricity, which may account for up to 40% of the total pulp production cost. In mechanical pulping mills, wood (biomass) residues are commonly utilized for electricity production through an associated combined heat and power (CHP) plant. This techno-economic evaluation deals with the possibility of utilizing a biomass integrated gasification combined cycle (BIGCC) plant in place of the CHP plant. Implementing BIGCC in a mechanical pulp production line might greatly improve the overall energy efficiency and cost-effectiveness, especially when more biomass from forest (such as branches and tree tops) is available. When the fibre material that negatively affects pulp properties is utilized as a bioenergy resource, the overall efficiency will be further improved. A TMP+BIGCC mathematical model is developed with ASPEN Plus. By means of modeling, three cases are studied: 1) adding more forest biomass logging residues in the gasifier, 2) adding the reject fibres in the gasifier, and 3) decreasing the TMP-specific electricity consumption (SEC) by up to 50%. For a TMP+BIGCC mill, the energy supply and consumption are analyzed in comparison with a TMP+CHP mill. The production profits are evaluated. ADDRESSES OF THE AUTHORS

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Integrated gasification combined cycle (IGCC) process simulation and optimization

Cited by 181 publications

References 9 publications

Performance Analysis of an Integrated Fixed Bed Gasifier Model for Different Biomass Feedstocks

Performance Analysis of an Integrated Fixed Bed Gasifier Model for Different Biomass Feedstocks

Simulation of Synthesis Gas Production from Steam Oxygen Gasification of Colombian Coal Using Aspen Plus®

Techno-economic evaluation of a mechanical pulp mill with gasification

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