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    退役风电叶片热解回收技术研究进展

    Research progress on pyrolysis recycling technology for decommissioned wind turbine blades

    • 摘要: 随着风电机组大规模退役潮的来临,退役风电叶片带来的环境压力日益突出。风电叶片由热固性树脂基纤维增强复合材料组成,无法再熔或重塑,资源化回收利用面临挑战。热解技术可通过高温无氧条件下有机组分的裂解,实现无机纤维与有机树脂分离。相较于机械法和化学法,该方法具有处理规模大、回收产物价值高、碳减排量高等优势。系统梳理了风电叶片的材料组成、热解回收技术及热解产物特性,重点总结了热解方式(固定床、流化床、微波、聚光光热、真空热解)、热解温度、热解气氛(N2、O2、CO2、水蒸气、真空)及催化剂类型(分子筛、金属氧化物、改性生物炭)对不同材料风电叶片的三相产物产率和液相产物组分的影响规律。结果表明:不同热解方式在产物分布上各具优势,固定床热解有利于固相产物的生成,流化床热解气相产率较高,微波与聚光光热热解在液相产物生成方面表现突出;热解温度对产物分布具有相对调控作用,中低温有利于酚类化合物生成,高温可促进芳烃类产物生成;热解气氛可定向优化产物组成,O2和水蒸气气氛能够显著增加双酚A的含量,但CO2气氛则起到相反作用;催化剂的引入可显著改变热解油的组分,其中ZnCl2改性生物炭催化剂可获得最高的苯酚产率,Ga改性ZSM-5催化剂可获得最高的芳烃产率。本综述可为退役风电叶片热解回收工艺优化及产物的高值化利用提供参考。

       

      Abstract: With large numbers of wind turbines being decommissioned, the environmental impact of decommissioned blades is becoming more severe. Wind turbine blades are composed of thermosetting resin matrix fiber-reinforced composites materials, which cannot be remelted or reshaped, posing challenges to resource recovery and utilization. Pyrolysis technology achieves the separation of inorganic fibers and organic resins by decomposing organic components under high temperature and oxygen free condition. Compared with mechanical recycling and chemical recycling, pyrolysis offers advantages such as large processing capacity, high value of recovered products, and high carbon emission reduction. This paper systematically reviews the material composition of wind turbine blades, pyrolysis recycling technologies, and characteristics of pyrolysis products. The effects of pyrolysis methods (fixed-bed, fluidized-bed, microwave, concentrated solar pyrolysis, vacuum pyrolysis), pyrolysis temperature, pyrolysis atmosphere (N2, O2, CO2, water vapor, vacuum), and catalyst types (molecular sieve, metal oxides, modified biochar) on the three-phase product yields and liquid product composition from different wind turbine blade materials were reviewed. The results indicate that different pyrolysis methods exhibit distinct advantages in product distribution: fixed-bed pyrolysis favors the formation of solid products, fluidized-bed pyrolysis results in higher gas yields, while microwave and concentrated solar thermal pyrolysis excel in liquid product generation. Pyrolysis temperature plays a regulatory role in product distribution, with medium-to-low temperatures favoring the formation of phenolic compounds and high temperatures promoting the generation of aromatic hydrocarbons. The pyrolysis atmosphere can directionally optimize product composition; O2 and water vapor atmospheres significantly increase the content of bisphenol A, whereas a CO2 atmosphere has the opposite effect. The introduction of catalysts can markedly alter the composition of pyrolysis oil, with ZnCl2-modified biochar achieving the highest phenol yield and Ga-modified ZSM-5 yielding the highest aromatic hydrocarbon content. This review provides a reference for optimizing the pyrolysis recovery process of decommissioned wind turbine blades and for the high-value utilization of pyrolysis products.

       

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