Simulation of biomass gasification in a dual fluidized bed gasifier

He, Jie; Göransson, Kristina; Söderlind, Ulf; Zhang, Wennan

doi:10.1007/s13399-011-0030-2

Cited by 31 publications

(8 citation statements)

References 13 publications

(20 reference statements)

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“…Analyzing the behavior of temperature as a dependent variable with the growth in the amount of steam in the reactors, it is observed that the increase of the steam to biomass ratio leads to a decrease of the gasification temperature [34], as evidenced in Figure 10 for the two biomasses. This is due to the fact that the rise in water favors the formation of H 2 .…”

Section: Gasifier Temperaturementioning

confidence: 95%

Simulation of a Downdraft Gasifier for Production of Syngas from Different Biomass Feedstocks

et al. 2021

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In the evaluation of gasification processes, estimating the composition of the fuel gas for different conditions is fundamental to identify the best operating conditions. In this way, modeling and simulation of gasification provide an analysis of the process performance, allowing for resource and time savings in pilot-scale process operation, as it predicts the behavior and analyzes the effects of different variables on the process. Thus, the focus of this work was the modeling and simulation of biomass gasification processes using the UniSim Design chemical process software, in order to satisfactorily reproduce the operation behavior of a downdraft gasifier. The study was performed for two residual biomasses (forest and agricultural) in order to predict the produced syngas composition. The reactors simulated gasification by minimizing the free energy of Gibbs. The main operating parameters considered were the equivalence ratio (ER), steam to biomass ratio (SBR), and gasification temperature (independent variables). In the simulations, a sensitivity analysis was carried out, where the effects of these parameters on the composition of syngas, flow of syngas, and heating value (dependent variables) were studied, in order to maximize these three variables in the process with the choice of the best parameters of operation. The model is able to predict the performance of the gasifier and it is qualified to analyze the behavior of the independent parameters in the gasification results. With a temperature between 850 and 950 °C, SBR up to 0.2, and ER between 0.3 and 0.5, the best operating conditions are obtained for maximizing the composition of the syngas in CO and H2.

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Section: Gasifier Temperaturementioning

confidence: 95%

Simulation of a Downdraft Gasifier for Production of Syngas from Different Biomass Feedstocks

et al. 2021

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“…The sludge dryer consists of a stoichiometric reactor, DRYR-S, to convert some weight of sludge to water, vaporize it, and then a flash operation, DRYR-FLS, to separate the vapor from dry solids, in similar fashion to [74], [71]. DRYR-S is specified as adiabatic with an exhaust vapor fraction of unity.…”

Section: Dryermentioning

confidence: 99%

Techno-economic analysis of wastewater sludge gasification: A decentralized urban perspective

Lumley

Ramey

Prieto

et al. 2014

Bioresource Technology

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Wastewater sludge management is a significant challenge for small-scale, urban wastewater treatment plants (WWTPs). Common management strategies stabilize sludge for land disposal by microbial action or heat. Such approaches require large footprint processing facilities or high energy costs. A new approach considers sludge to be a fuel which can be used on-site to produce electricity. Electrical power generation fueled by sludge may serve to reduce the volume of hazardous waste requiring land disposal and create economic value for WWTP operators. To date, no detailed system designs or techno-economic analyses have been found for small scale sludge fueled power plants. Fortunately, a literature base exists describing the fundamentals of applying thermochemical conversion (TCC) technologies to sewage sludge. Thermochemical conversion of sludge is established for large WWTPs, however large system design techniques may not be applicable to small systems.To determine the feasibility of small scale power generation fueled by sludge, this work evaluates several thermochemical conversion technologies from the perspective of small urban WWTPs. Literature review suggests wet oxidation, direct combustion, pyrolysis, and gasification as candidate front-end TCC technologies for on-site generation. Air and steam blown gasification are found to be the only TCC technologies appropriate for sludge. Electrical power generation processes based on both air and steam blown gasification are designed around effective waste heat recovery for sludge drying. The systems are optimized and simulated for net electrical output in ASPEN Plus R . Air blown gasification is found to be superior. Sensitivity analyses are conducted to determine the effect of fuel chemical composition on net electrical output. A technical analysis follows which determines that such a system can be built using currently available technologies. Finally, an economic analysis concludes that a gasification based power system can be economically viable for WWTPs with raw sewage flows of 0.115 m 3 /s, or about 2.2 million gallons per day.

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“…The main advantages are that the gasifier can easily process various solid fuels, including high moisture biomass, and that the biomass pre-treatment is fairly simple (Zhang 2010). The details can be found in the literature (Göransson et al 2011;He et al 2012). A detailed study on syngas cleaning was made by Göransson et al (2011).…”

Section: Bigcc and Its Implementation In A Tmp Millmentioning

confidence: 99%

“…Table 2. Model input data (Göransson et al, 2011;He et al, 2012 100 bar and 565C 100 bar to 0.6 bar (through a steam turbine cycle) Steam (PM)…”

Section: Simulation With Aspen Plusmentioning

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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Simulation of biomass gasification in a dual fluidized bed gasifier

Cited by 31 publications

References 13 publications

Simulation of a Downdraft Gasifier for Production of Syngas from Different Biomass Feedstocks

Simulation of a Downdraft Gasifier for Production of Syngas from Different Biomass Feedstocks

Techno-economic analysis of wastewater sludge gasification: A decentralized urban perspective

Techno-economic evaluation of a mechanical pulp mill with gasification

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