Development of an innovative 3-stage steady-bed gasifier for municipal solid waste and biomass

Antonopoulos, Ioannis; Karagiannidis, A.; Elefsiniotis, L.; Perkoulidis, G.; Gkouletsos, A.

doi:10.1016/j.fuproc.2011.08.016

Cited by 25 publications

(12 citation statements)

References 24 publications

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“…The goal was that the tar should not cross the oxidation zone. This cannot occur here at a lower temperature [24][25][26]. In the fixed-bed zone of the reactor model, the roasting progress takes place in the parabolic cone [27].…”

Section: Name Of Each Partmentioning

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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Section: Name Of Each Partmentioning

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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“…He installed an air supply to the zone of oxidative pyrolysis in the shaft of a gasifier. Such an improvement makes it possible to control the amount of recycled gas coming from the combustion chamber [5]. A downside of the gasifiers invented by de Lacotte and Elefsiniotis is the low efficiency of gasification, which is caused by high heat losses of the external combustion chamber.…”

Section: A Review Of Technologies For Multistage Solid Fuel Gasificationmentioning

confidence: 99%

Modeling of Pyrolysis in a Stage Scheme of Low‐Grade Solid Fuel Gasification

Козлов¹,

Levin²,

Svishchev³

et al. 2017

Pyrolysis

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This paper is concerned with the development of a model of wood pyrolysis in a screw reactor as the first stage of the multistage gasification process. In terms of design, the pilot pyrolyzer represents a recuperative heat exchanger where the heat carrier is represented by a mixture of exhaust and recirculation gases. To prevent clinkering of particles and thermal inhomogeneities, screw-type transportation is used to transport fuel. In order to describe kinetics of pyrolysis and transport of volatiles within the wood particles and their transition to the gas phase, we carried out the studies using a complex of synchronous thermal analysis. The original techniques for the interpretation of measurements were developed for this complex, including the techniques for technical analysis of fuels and identification of detailed kinetics and mechanism of pyrolysis. A detailed numerical modeling of pyrolyzer was performed using the Comsol Multiphysics software, which makes it possible to optimize the design and operating parameters of the pyrolysis process in a screw reactor.

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“…In addition, integrating char in the fluidized bed can be used as an effective means for tar decomposition, as stated by Basu [4]. There are many researchers [7][8][9] who investigated the effect of multistage gasification systems and they affirmed that they upgraded the quality of the product gas by diminishing the tar concentration. Therefore, an exclusive gasification technology, a multistage fluidized bed gasifier, that aims at low tar production could be developed on the basis of the above-mentioned principles.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Prosopis juliflora Air Gasification in Multistage Fluidized Process

et al. 2020

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A multistage atmospheric fluidized bed gasifier was developed using the Aspen Plus simulation process. The innovative gasification reactor aims to yield a high-quality product gas as it conducts pyrolysis, combustion, and reduction in different zones. In addition, it uses gas as a heat carrier and has a fluidized char bed in the reduction zone to enhance the in-situ tar reduction. In order to study the feasibility of the gasifier, an evaluation of the product gas and the process efficiency is required. The proposed model was based on the reaction rates and hydrodynamic parameters of the bubbling bed. Four different stages were initially considered in the simulation process: decomposition of the feed, partial volatile combustion, char reduction, and gas solid separation. The gasification reactor was operated over a temperature range of 800–1000 °C and an isothermal combustion reactor was operated at 1000 °C. In addition, the air to biomass mass ratio was varied from 0.2 to 0.5. It has been validated and displayed very good agreement with published data. Effects of gasification reactor temperature, air to biomass ratio, and gasifier dimensions on the composition of product gas were investigated Results showed that the principal component is CO and its concentration in the product gas increases with increase in gasifier temperature but decreases with increasing air to biomass ratio. The results also gave a relatively high value of the lowered gas caloric value and acceptable cold gas efficiency which help the sizing of gasifiers and the choice of optimal operating conditions.

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Development of an innovative 3-stage steady-bed gasifier for municipal solid waste and biomass

Cited by 25 publications

References 24 publications

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

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

Modeling of Pyrolysis in a Stage Scheme of Low‐Grade Solid Fuel Gasification

Simulation of Prosopis juliflora Air Gasification in Multistage Fluidized Process

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