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Effects of dry and hydrothermal carbonisation on the properties of solid recovered fuels from construction and municipal solid wastes

机译：干燥水热碳化对施工和城市固体废物的固体回收燃料性能的影响

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摘要

The growing production of non-recyclable urban wastes generates environmental problems that impose new alternatives for their energetic valorisation. Nonetheless, some of these wastes do not have adequate properties to be directly used in waste-to-energy technologies, thus requiring adequate pre-treatments to improve their fuel properties. This work aimed to evaluate dry and hydrothermal carbonisation (DC and HTC) as technologies to convert solid recovered fuel (SRF) from construction and municipal solid wastes to biochars or hydrochars with improved fuel quality. The operational parameters evaluated were temperature, mass ratio of SRF:water, and incorporation of a liquid additive (used cooking oil, UCO). The chars were characterised for chemical composition, calorific value, TGA profiles and surface functional groups. The chemical oxygen demand (COD), concentration of total phenols, pH, conductivity and the main components in process waters were determined. Results showed an improvement of fuel characteristics in terms of hydrophobicity and calorific value, enabling the use of chars for waste-to-energy technologies. HTC produced hydrochars with better fuel characteristics, presenting calorific values of 28-33 MJ/kg db, and lower average ash and chlorine contents (2.8 wt% db and 3.1 wt% db, respectively). The addition of UCO improved these fuel characteristics. However, the generation of an effluent that needs further decontamination and the lower amount of moisture present in SRF possibly made DC more attractive in terms of energy and costs requirements. A treatment at 350 degrees C during 30 min was recommended for a good compromise among process costs and char properties.
机译：不可循环城市废物的日益增长的生产产生了对其能量储存的新替代品产生的环境问题。尽管如此，这些废物中的一些没有足够的性能，可以直接用于废物到能量技术，因此需要足够的预处理来改善其燃料特性。这项工作旨在评估干燥和水热碳化（DC和HTC）作为转化燃料和城市固体废物的固体回收燃料（SRF），以提高燃料质量。评估的操作参数是SRF：水的温度，质量比，以及掺入液体添加剂（用过的食用油，UCO）。该字符以化学成分，热值，TGA谱和表面官能团为特征。测定了化学需氧量（COD），总酚，pH，电导率和工艺水中主要成分的浓度。结果表明，在疏水性和热值方面提高了燃料特性，从而能够使用用于废物到能量技术的字符。 HTC产生了具有更好燃料特性的Hydrochars，呈现出28-33mJ / kg dB的热值，较低的平均灰分和氯含量（分别为2.8wt％dB和3.1wt％dB）。添加UCO改善了这些燃料特性。然而，产生需要进一步净化的流出物和SRF中存在的较低的水分可能使DC在能量和成本要求方面更具吸引力。建议在30分钟内进行350℃的处理，以便在工艺成本和Char性质之间进行良好的妥协。

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  • 来源
    《Energy Conversion & Management》 |2021年第6期|114101.1-114101.14|共14页
  • 作者

    Alves Octavio; Nobre Catarina; Durao Luis; Monteiro Eliseu; Brito Paulo; Goncalves Margarida;

  • 作者单位

    Univ NOVA Lisboa Fac Ciencias & Tecnol MEtR Mech Engn & Resource Sustainabil Ctr Dept Sci & Technol Biomass P-2829516 Caparica Portugal|Polytech Inst Portalegre VALORIZA Res Ctr Endogenous Resource Valorizat P-7300555 Portalegre Portugal;

    Univ NOVA Lisboa Fac Ciencias & Tecnol MEtR Mech Engn & Resource Sustainabil Ctr Dept Sci & Technol Biomass P-2829516 Caparica Portugal;

    Univ NOVA Lisboa Fac Ciencias & Tecnol MEtR Mech Engn & Resource Sustainabil Ctr Dept Sci & Technol Biomass P-2829516 Caparica Portugal|Polytech Inst Portalegre VALORIZA Res Ctr Endogenous Resource Valorizat P-7300555 Portalegre Portugal;

    Polytech Inst Portalegre VALORIZA Res Ctr Endogenous Resource Valorizat P-7300555 Portalegre Portugal|Univ Coimbra Fac Sci & Technol Dept Mech Engn ADAI LAETA P-3030788 Coimbra Portugal;

    Polytech Inst Portalegre VALORIZA Res Ctr Endogenous Resource Valorizat P-7300555 Portalegre Portugal;

    Univ NOVA Lisboa Fac Ciencias & Tecnol MEtR Mech Engn & Resource Sustainabil Ctr Dept Sci & Technol Biomass P-2829516 Caparica Portugal|Polytech Inst Portalegre VALORIZA Res Ctr Endogenous Resource Valorizat P-7300555 Portalegre Portugal;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Construction and demolition waste; Municipal solid waste; Solid recovered fuel; Dry carbonization; Hydrothermal carbonization; Waste valorization;

    机译：建筑和拆除废物;市固体废物;固体回收燃料;干碳化;水热碳化;废物储存;

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