风电叶片用聚氨酯/玻璃纤维混合物热解特性研究

STUDY ON PYROLYSIS CHARACTERISTICS OF POLYURETHANE/GLASS FIBERS FOR WIND TURBINE BLADES

利用热重分析(TG)和管式炉实验对风电叶片基础组分混合物(聚氨酯和玻璃纤维)的热解特性和产物分布进行研究。TG实验表明聚氨酯/玻璃纤维混合物表现出与纯聚氨酯不同的热解行为,且玻璃纤维将延后聚氨酯脱羧反应发生的温度。动力学计算结果表明,聚氨酯含量将对混合物的热解活化能产生更大影响,玻璃纤维则使得纯聚氨酯热解的第二步转变为两个阶段反应,管式炉实验证明聚氨酯与玻璃纤维质量混合比为3∶6时产生的气体有较高的热值。

Thermogravimetric analysis(TG)and tube furnace experiments were used in this study to examine the pyrolysis properties and product distribution of the fundamental component mixture(polyurethane and glass fiber)of wind turbine blades.High heating rates could promote thermal decomposition of the samples and prolong the reaction process of the samples with low polyurethane content,but they had no effect on the decarboxylation reaction of the samples.While a suitable mixing ratio contribute to the pyrolysis of the mixture,glass fiber delayed the temperature at which the polyurethane decarboxylation reaction took place.Glass fiber changed the second phase of pure polyurethane pyrolysis into a two-stage process,which had weaker effect on the thermal activation energy than the amount of polyurethane present.The presence of glass fibers would lead to an increase in the activation energy of the thermal decomposition of the mixture with the increase of heating rate.Additionally,the gas produced from the mixture with a polyurethane to glass fiber ratio of 3∶6 had a higher calorific value.