Downdraft co-gasification of high ash biomass and plastics

Fazil, Afrizal; Kumar, Sandeep; Mahajani, Sanjay M.

doi:10.1016/j.energy.2021.123055

Cited by 50 publications

(14 citation statements)

References 38 publications

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“…Experimental Studies. The garden waste and lowdensity polyethylene (LDPE) air co-gasification in a downdraft gasifier has been studied experimentally by Fazil et al 36 They noticed that the calorific value (3.5 MJ/Nm 3 ) of the produced gas increased (4.7 MJ/Nm 3 ) as the LDPE blending ratio increased from 0 to 25%. In addition, the CO and H 2 in the produced gas increased by adding up to 25% LDPE.…”

Section: Co-gasification Of Lignocellulosic Biomass (Lcb) and Plasticsmentioning

confidence: 99%

“…For co-gasification, many researchers have combined or mixed biomass with plastic, reporting a variety of advantages, including improved gas yield and syngas quality, cold gasification efficiency, better carbon conversion, and an enhancement in calorific values compared to biomass mono-gasification. Fazil et al 36 studied the effect of blending ratio on calorific value and cold gas efficiency for garden waste and LDPE co-gasification. They observed a 34.29% and 41% increase in calorific value and cold gas efficiency, respectively, when the plastic ratio increased from 0% to 25%.…”

Section: Effect Of Operating Parameters Based On Experimental Investi...mentioning

confidence: 99%

“…Plastic waste gasification can potentially reduce landfill utilization and reliance on fossil fuels . However, plastic waste mono-gasification can present operational challenges due to the polymer’s agglomeration and high tar yield . In addition, it can produce hazardous and corrosive gases.…”

Section: Introductionmentioning

confidence: 99%

“…35 However, plastic waste mono-gasification can present operational challenges due to the polymer's agglomeration and high tar yield. 36 In addition, it can produce hazardous and corrosive gases. For instance, Arena and Di Gregorio 37 have used a fluidized-bed reactor (capacity of 30−100 kg/h) for mixed plastic waste gasification.…”

Section: Introductionmentioning

confidence: 99%

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A Critical Outlook on Lignocellulosic Biomass and Plastics Co-Gasification: A Mini-Review

2022

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The generation of solid waste and lignocellulosic biomass (LCB) residues and their environmentally responsible disposal have emerged as major global challenges. A major part (around 12%) of solid waste is plastic, and the increased accumulation has become a serious public health and environmental hazard. For the combined management of residual LCB biomass and plastic waste, thermochemical conversion, particularly gasification, appears to be a potential alternative. Gasification is a process that turns high carbon-containing solid feedstocks into a combustible gas mixture known as syngas or producer gas based on the gasifying agent. Co-gasification (the gasification of two distinct feedstocks) has the potential to facilitate eco-friendly plastic waste disposal while also contributing to the production of green energy. The literature on the co-gasification of LCB and plastic waste is reviewed in the current study. These are mostly experimental studies on biomass and plastics carried out in various reactors with multiple gasifying mediums. The synergistic effects of various feedstock compositions and attributes are examined during co-gasification using experimental studies and reactor-level modeling. The impacts of operating parameters on the gas yield, tar formation, and gasifier performance are also analyzed. Finally, the challenges, research gaps, and the way toward commercialization in the context of co-gasification of various combinations of LCB and plastics are presented.

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Section: Co-gasification Of Lignocellulosic Biomass (Lcb) and Plasticsmentioning

confidence: 99%

Section: Effect Of Operating Parameters Based On Experimental Investi...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Critical Outlook on Lignocellulosic Biomass and Plastics Co-Gasification: A Mini-Review

2022

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“…There are many different kinds of gasification reactors, including fluidized-bed gasifier, updraft gasifier, and downdraft gasifier, etc. [ 18 , 19 , 20 , 21 , 22 , 23 ]. Compared with other gasifiers, updraft gasifier has higher gasification efficiency, wider adaptability of raw materials, and lower dust content in the syngas [ 24 , 25 , 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of an Improved Updraft Biomass Gasifier Based on Aspen Plus

Zhu

Shen

et al. 2022

IJERPH

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In this paper, numerical investigation and optimization is conducted upon an improved updraft gasifier which is expected to overcome the weakness of conventional updraft gasifier. The comprehensive Aspen Plus model of the improved updraft gasifier is based on the RYield and RCSTR reactor. The tar prediction model is constructed, and the yield of tar is determined by the volatile of biomass and gasification temperature. The Aspen Plus simulation results agree very well with experiment results for the product yields and gasification efficiency, which shows the accuracy of the Aspen Plus model. The tar content in syngas of the improved gasifier is proved to be much lower than that of the conventional one by this model. The inflection point of the gasification efficiency occurs when air ratio is 0.25, and the optimum steam proportion in the air is 7.5%. Such a comprehensive investigation could provide necessary information for the optimal design and operation of the improved updraft gasifier.

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Mathematical modeling of tar conversion on downdraft biomass gasification processes

Donskoy

2023

Biofuels Bioprod Bioref

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The article concerns some problems associated with the use of low‐grade fuels for the production of syngas in fixed‐bed gasifiers. Syngas is typically used to feed internal combustion engines in small power systems. Gas quality can be understood as its various characteristics, such as calorific value, the content of individual components (for example, hydrogen), low tar and soot content, and so forth. Achieving these quality criteria often requires specific conditions for the gasification process, in addition, some of them may be limited by additional requirements that are associated with thermal stability or fuel conversion requirements. When evaluating the technical and economic characteristics of gasification‐based power plants, the optimal efficiency does not always correspond to the higher efficiency of the gasification process and the quality of producer gas. In this regard, the aim is to develop optimization methods for different criteria and to create regime maps that cover physically achievable options. Novel mathematical models of tar conversion are proposed, allowing investigation of the dependencies of tar yield on gasification conditions, including the addition of catalysts or staged air supply. Computational tools based on thermodynamic and kinetic models make it possible to solve some of these problems, first of all, to consider and compare the efficiency of various methods for reducing tar content in producer gas (staged gasification, fuel mixing, thermal, and catalytic methods of tar elimination). The choice of relatively simple mathematical models allows us to conduct numerical calculations in a wide range of conditions and to optimize the parameters of biofuel conversion plants. This approach allows a more flexible choice of gasifier operating conditions, including its work as a part of a power unit. Optimal parameters are calculated for specific conditions: secondary air ratio (1–20%) and fraction of catalytic material (5–10%). The results may be used in the analysis and choice of biofuel gasification conditions at small power plants.

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Downdraft co-gasification of high ash biomass and plastics

Cited by 50 publications

References 38 publications

A Critical Outlook on Lignocellulosic Biomass and Plastics Co-Gasification: A Mini-Review

A Critical Outlook on Lignocellulosic Biomass and Plastics Co-Gasification: A Mini-Review

Numerical Simulation of an Improved Updraft Biomass Gasifier Based on Aspen Plus

Mathematical modeling of tar conversion on downdraft biomass gasification processes

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