Enhanced gasification of waste plastics for hydrogen production: experiment and simulation

IF 5.6 2区工程技术 Q2 ENERGY & FUELS

Journal of The Energy Institute Pub Date : 2025-04-19 DOI:10.1016/j.joei.2025.102114

Shihao Guo , Mengyao Gu , Yun Luo , Juan Chen , Hong Yao

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引用次数: 0

Abstract

The quality of hydrogen produced from waste plastic steam gasification is compromised by CO₂ and tar. While the use of CaO for CO₂ adsorption and tar catalytic cracking has been explored, the impact of the heat released during CaO carbonation on hydrogen production has not been sufficiently studied. This work investigates the role of Fe-doped CaO in enhancing hydrogen production and tar removal during gasification. Aspen Plus is used to evaluate the impact of CaO carbonation heat on hydrogen generation via waste plastic steam gasification. Experimental results show that, at 700 °C and 20 vol% H₂O, the H₂ concentration and yield increase to 67.9 vol% and 288.6 mL/g, respectively, with a liquid production rate of 17 % when Ca₉₀Fe₁₀/PE mass ratio is 2.0. In simulations, with the gasifier operating at 700 °C and maintaining thermal equilibrium, H₂ molar percentage is 58.5 % for an O₂ inflow of 13.03 kg/h. At 700 °C and Ca₉₀Fe₁₀/PE mass ratio of 2.2, the heat generated by the CO₂ adsorption reaction of CaO is 76.51 MJ/h and requires 6.9 kg/h of O₂ and the molar percent of H₂ is 80.76 %. To achieve material circulation, 0.8 kg/h of CH₄ is combusted in the calciner to regenerate CaO, consuming 3.2 kg/h of O₂. Overall, O₂ consumption for the entire cycle is reduced by 2.93 kg/h, compared to processes without CaO.

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废塑料强化气化制氢：实验与模拟

废塑料蒸汽气化产生的氢的质量受到二氧化碳和焦油的影响。虽然已经探索了CaO在CO2吸附和焦油催化裂化中的应用，但CaO碳化过程中释放的热量对制氢的影响尚未得到充分的研究。本研究探讨了掺铁CaO在气化过程中促进制氢和除焦油的作用。Aspen Plus用于评估CaO碳化热对废塑料蒸汽气化制氢的影响。实验结果表明，在700℃和20 vol% H2O条件下，Ca90Fe10/PE质量比为2.0时，H2浓度和产率分别提高到67.9%和288.6 mL/g，产液率为17%。在模拟中，当气化炉在700°C下运行并保持热平衡时，当氧气流入13.03 kg/h时，H2的摩尔百分比为58.5%。在700℃、Ca90Fe10/PE质量比为2.2条件下，CaO吸附CO2反应产生的热量为76.51 MJ/h，需氧量为6.9 kg/h， H2的摩尔分数为80.76%。为了实现物料循环，在煅烧炉中燃烧0.8 kg/h的CH4再生CaO，消耗3.2 kg/h的O2。总的来说，与没有CaO的工艺相比，整个循环的氧气消耗减少了2.93 kg/h。

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来源期刊

Journal of The Energy Institute 工程技术-能源与燃料

CiteScore

10.60

自引率

5.30%

发文量

166

审稿时长

16 days

期刊介绍： The Journal of the Energy Institute provides peer reviewed coverage of original high quality research on energy, engineering and technology.The coverage is broad and the main areas of interest include: Combustion engineering and associated technologies; process heating; power generation; engines and propulsion; emissions and environmental pollution control; clean coal technologies; carbon abatement technologies Emissions and environmental pollution control; safety and hazards; Clean coal technologies; carbon abatement technologies, including carbon capture and storage, CCS; Petroleum engineering and fuel quality, including storage and transport Alternative energy sources; biomass utilisation and biomass conversion technologies; energy from waste, incineration and recycling Energy conversion, energy recovery and energy efficiency; space heating, fuel cells, heat pumps and cooling systems Energy storage The journal''s coverage reflects changes in energy technology that result from the transition to more efficient energy production and end use together with reduced carbon emission.