Pure oxygen fixed-bed gasification of wood under high temperature (&gt;1000 °C) freeboard conditions

Wiinikka, Henrik; Wennebro, Jonas; Gullberg, Marcus; Pettersson, Esbjörn; Weiland, Fredrik

doi:10.1016/j.apenergy.2017.01.054

Cited by 32 publications

(9 citation statements)

References 29 publications

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“…The fixed-bed oxygen-blown gasifier (FOXBG,~20 kW) used in this work was previously described in detail [13]. Wiinikka et al showed that the FOXBG produced a syngas of the same high quality, and similar composition, as syngas produced from a much larger (1 MW) entrained flow biomass gasifier operated with the same feedstock.…”

Section: The Gasifiermentioning

confidence: 99%

“…The oxidation agent, in this case, pure oxygen (O 2 ), was introduced through different inlets at the bottom part of the reactor, named primary, secondary, and tertiary. Primary oxygen was introduced from underneath the bed (tubes inner diameter, Ø i , 3 mm), whereas both secondary and tertiary inlets (tubes Ø i 1 mm) were positioned above the bed according to the description in an earlier publication [13]. All ingoing gas flows were monitored using Bronkhorst mass flow controllers (Bronkhorst F201AV).…”

Section: The Gasifiermentioning

confidence: 99%

“…The sample bags were rinsed three times with air before use. The GC (CP 3800, Varian, Palo Alto, CA, USA), described in previous works [13], was able to analyze the same compounds as the µGC, with the exception of He. However, the GC was also able to analyze additional hydrocarbons using a flame ionization detector (FID) and sulfur compounds using a pulsing flame detector (PFPD).…”

Section: Syngas Sampling and Analysis 241 Gaseous Componentsmentioning

confidence: 99%

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Oxygen-Blown Gasification of Pulp Mill Bark Residues for Synthetic Fuel Production

2021

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Synthetic fuel production via gasification of residual biomass streams from the pulp and paper industry can be an opportunity for the mills to enable improved resource utilization and at the same time reduce the production of excess heat. This paper summarizes initial oxygen-blown gasification experiments with two bark residues from a European pulp and paper mill, i.e., a softwood bark and a hardwood bark. The gasification process was characterized by measuring syngas yields and process efficiency to find optimum operating conditions. In addition, impurities in the syngas and ash behavior were characterized. Maximum yields of CO and H2 were obtained from softwood bark and amounted to approximately 29 and 15 mol/kg fuel, respectively. Optimum cold gas efficiency was achieved at an oxygen stoichiometric ratio of λ = 0.40 and was approximately 76% and 70% for softwood bark and hardwood bark, respectively. Increased λ had a reducing effect on pollutants in the syngas, e.g., higher hydrocarbons, NH3, HCl, and soot. The situation for sulfur species was more complex. Evaluation of the bark ashes indicated that slag formation could start already from 800 °C. Furthermore, a non-intrusive laser diagnostics technique gave rapid feedback on the millisecond scale. Measured syngas temperature and water content were in good agreement with the applied reference methods.

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Section: The Gasifiermentioning

confidence: 99%

Section: The Gasifiermentioning

confidence: 99%

Section: Syngas Sampling and Analysis 241 Gaseous Componentsmentioning

confidence: 99%

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Oxygen-Blown Gasification of Pulp Mill Bark Residues for Synthetic Fuel Production

2021

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“…In gasification reactions above 900 • C, all effects are present [47]. The temperature of the gas produced alone should be heated to 1200 • C, to reduce the tar content to 15-20 mg/Nm 3 .…”

Section: Effect Of Adding Water and Airmentioning

confidence: 99%

Improving the Efficiency of Pyrolysis and Increasing the Quality of Gas Production through Optimization of Prototype Systems

et al. 2019

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Pyrolysis is a thermochemical process that consists of the degradation of organic polymers and biomass minerals in lignocellulose materials. At low pyrolysis temperature (300–400 °C), primarily carbon is produced during the reaction time. Rapid pyrolysis takes place at temperatures between 500 and 650 °C. If the temperature is higher than 700 °C, the final product is methane, also known as biogas. The pyrolysis generator can be combined with a small power plant (CHP), which is a promising technology because the unit can be installed directly near the biomass production, and electricity can be fed de-centrally to the public utility network, while there are several possibilities for using waste heat in local systems. Carbonaceous ash can be utilized well in the agricultural field, because, in areas with intensive farming, the soil suffers from carbon and mineral deficiencies, and the phenomenon of material defect can be reduced by a proper level of implementation. This study describes the technical content of the biochar pilot project, and then, through a detailed presentation of the experimental results, we interpret the new scientific results. Our aim is to improve the quality of the produced gas by increasing the efficiency of the pyrolysis generator. In order for the pyrolysis unit to operate continuously, with proper efficiency and good gas quality, it is necessary to optimize the operation process. Our review reveals that the use of vibration may be advantageous during pyrolysis, which affects the mass of the pyrolysis carbon in a plane. Accordingly, the application of vibration to the input section of the funnel might enhance the quality of the gas, as well. The study concludes that more accurate dimensioning of the main parts of the gas reactor and a more convenient design of the oxidation and reduction zones enhance the good-quality gas output.

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“…Similar experimental research is conducted by Hsi et al to study the effect of air/fuel ratio, air flow rate, and air preheating temperature and the moisture content on the carbon conversion rate and gasification characteristics of woody biomass. Wiinikka et al compared the performance of two types of oxygen‐blown gasifiers with the wood feedstock. Besides the experimental research, several mathematical models and numerical simulations are executed to understand the gasification mechanism.…”

Section: Introductionmentioning

confidence: 99%

Development of a high‐temperature two‐stage entrained flow gasifier model for the process of biomass gasification and syngas formation

2019

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Summary This paper presents development of the Mitsubishi Heavy Industries (MHI) gasifier utilizing an analogy between a model with coal feedstock and the model with torrefied woody biomass. A computational fluid dynamics (CFD) model was primarily developed for coal gasification, and the simulation results were validated with similar published work and experimental measurements. The model was extended for the woody biomass to predict the gasifier performance under the gasification process. The results were used to compare the effect of fuel type on the gasifier performance and gaseous product compositions. The second‐level injection nozzles were modified tangentially, and the flow characteristics, species yields, and temperature were evaluated. The possibility of reducing the gasifier length from 13 to 8 m is also evaluated for different total length. The results revealed that using woody biomass leads to a decrease in the mole fraction of CO and H2 at the gasifier outlet compared with coal. An opposite trend was observed for CO2 and CH4 compositions. The contributions of modified second‐level nozzles to the total gas composition and exit temperature only account for less than 3%. Reducing the gasifier length from 13 to 8 m increased the exit temperature from 1289 to 1340 K, but the changes in the exit gas composition were less than 2%. The new design of the MHI gasifier can reduce the investment costs by reducing the gasifier length as well as using biomass instead of coal.

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Pure oxygen fixed-bed gasification of wood under high temperature (>1000 °C) freeboard conditions

Cited by 32 publications

References 29 publications

Oxygen-Blown Gasification of Pulp Mill Bark Residues for Synthetic Fuel Production

Oxygen-Blown Gasification of Pulp Mill Bark Residues for Synthetic Fuel Production

Improving the Efficiency of Pyrolysis and Increasing the Quality of Gas Production through Optimization of Prototype Systems

Development of a high‐temperature two‐stage entrained flow gasifier model for the process of biomass gasification and syngas formation

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