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<p>Compared to Refuse-derived fuel (RDF) combustion, RDF gasification is a cleaner way of converting waste to value-added chemicals and for decentralized heat and power generation. However, RDF gasification in India is not well-established since Indian RDF differs greatly from developed countries in terms of higher plastic content. Furthermore, the existing literature on RDF downdraft gasification is insufficient, particularly in terms of quantifying the impact of plastic variation. The current study investigates the impact of plastic variation in a 3&#xa0;kg h<sup>− 1</sup> RDF downdraft gasifier and proposes a workable plastic fraction in RDF for stable gasification operation. The plastic fraction varied from a high level of 35% (35 wt%-RDF) to a low plastic level of 5% (5 wt%-RDF). The study found that increasing plastic fractions from 5 wt% to 35 wt% reduced the pellet density and compressive strength by 25% and 60%, respectively. These changes in pellet properties affected the gasification performance, for instance, gas calorific value decreased by 26% when plastic content rose to 35%. The lower density and strength for 35 wt%-RDF caused crushing of its char and increased pressure drop inside the reactor, leading to gasifier shutdown. The study found that RDF gasification with plastic content ~ 35% is not suitable, and with 5% plastic is insufficient for effective plastic waste utilization. RDF pellets with 15% plastic (15 wt%-RDF) showed stable gasification operations without char crumbling, yielding an average gas calorific value of 3&#xa0;MJ kg<sup>− 1</sup> and tar content of 1.4&#xa0;g Nm<sup>− 3</sup>.</p>

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Downdraft Gasification of Refuse-Derived Fuels with Different Plastic Content

  • 期刊论文

  • 发表日期：

    2025年6月20日

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  • Priyanka Tripathi,
  • Lakshminarayana Rao

摘要

Compared to Refuse-derived fuel (RDF) combustion, RDF gasification is a cleaner way of converting waste to value-added chemicals and for decentralized heat and power generation. However, RDF gasification in India is not well-established since Indian RDF differs greatly from developed countries in terms of higher plastic content. Furthermore, the existing literature on RDF downdraft gasification is insufficient, particularly in terms of quantifying the impact of plastic variation. The current study investigates the impact of plastic variation in a 3 kg h− 1 RDF downdraft gasifier and proposes a workable plastic fraction in RDF for stable gasification operation. The plastic fraction varied from a high level of 35% (35 wt%-RDF) to a low plastic level of 5% (5 wt%-RDF). The study found that increasing plastic fractions from 5 wt% to 35 wt% reduced the pellet density and compressive strength by 25% and 60%, respectively. These changes in pellet properties affected the gasification performance, for instance, gas calorific value decreased by 26% when plastic content rose to 35%. The lower density and strength for 35 wt%-RDF caused crushing of its char and increased pressure drop inside the reactor, leading to gasifier shutdown. The study found that RDF gasification with plastic content ~ 35% is not suitable, and with 5% plastic is insufficient for effective plastic waste utilization. RDF pellets with 15% plastic (15 wt%-RDF) showed stable gasification operations without char crumbling, yielding an average gas calorific value of 3 MJ kg− 1 and tar content of 1.4 g Nm− 3.