MA-PA-SA/改性粉煤灰复合相变储能材料的制备与性能

Preparation and Properties of Composite Phase Change Energy Storage Material MA-PA-SA/Modified Fly Ash

将肉豆蔻酸(MA)、棕榈酸(PA)、硬脂酸(SA)混合后形成的相变储能基材与工业固废粉煤灰通过熔融混合法制得MA-PA-SA/改性粉煤灰复合相变储能材料。MA、PA、SA低脂肪酸的质量比为m(MA)∶m(PA)∶m(SA)=56.82∶28.08∶15.10,MA-PA-SA与粉煤灰的质量比为m(MA-PA-SA)∶m(粉煤灰)=1∶1。采用红外(FT-IR)光谱、差热-热重(DTA-TG)分析、储/放热循环实验研究了复合材料的结构和热性能,FT-IR结果表明,MA-PA-SA低共熔物与改性粉煤灰为物理掺杂;DTA结果表明,复合材料的相变温度为45.8℃,相变焓为93.58J/g。材料经过800次的储/放热循环后,其相变焓损失率为12.9%,表明该材料的储热性能稳定,具有较长的使用寿命。该新型复合相变储能材料具有合适的相变温度、较高的相变焓、储/放热性能稳定,且利用了工业固体废弃物粉煤灰,降低了材料的制备成本,在储能和固体废弃物的再利用方面具有实际应用意义。

Amyristic-palmitic-stearic acid/modified fly ash composite phase change material (CPCM) has been prepared,which was a mixture of myristic acid, palmitic acid and stearic acid. The mass ratio was m (MA)∶ m (PA)∶ m (SA)=56.82 ∶28.08 ∶15.10 and m (PCM)∶ m (fly ash)= 1 ∶1 were sui-table, by the heating method. The FT-IR, DTA-TG,and storage/release thermal cycling test has been used to determine the structure and thermal properties of the CPCM. The FT-IR results show that just between each constituent physical interaction. The DTA results indicate that the peak temperature and latent heat of CPCM are 45.8 ℃, 93.58 J/g, respectively. The rate of phase change enthalpy loss is 12.9% through 800 cycles of storage/release thermal cycling test, performance show that the CPCM has good thermal stability and long service life. All the results indicate that the CPCM has proper phase change temperature, high phase change enthalpy, good thermal stability, and fly ash a support material, which reduces the manufacturing cost of the material. It has practical application significance in the field of energy storage and solid waste utilization.