预处理方法对炭化木基复合相变储能材料性能的影响

doi:10.3969/j.issn.0253-2417.2023.03.009

Abstract

Abstract:

Using natural balsa(Ochroma lagopus) wood(NW) as raw material, hemicellulose and lignin were removed by hydrothermal pretreatment and acidic sodium chlorite pretreatment to produce the desiccated hemicellulose balsa wood(HW) and the desiccated lignin balsa wood(LW). Then, carbonization was performed to obtain the untreated carbonized wood(CW), the delignified carbonized wood(CLW) and the delignified hemicellulose carbonized wood(CHW). Eventually, the charred wood-based composite phase change energy storage materials(CLWP and CHWP) were produced after further encapsulation of paraffin wax(PW). The effects of chemical composition removal and charring processes on the balsa wood matrix were analyzed by SEM, FT-IR, XRD, TG/DTG and N₂ adsorption/desorption isotherms. The results showed that both dehemicellulose and delignification treatments would neither destroy the original three-dimensional porous honeycomb structure of balsa wood nor the structure of cellulose. Moreover, the thermal stability of HW was better than that of LW. Whereas the volume of charred wood became significantly smaller after charring treatment, the volume shrinkage rate of CHW was 56%, which was lower than that of CLW(60%). Meanwhile, the specific surface area of CHW reached 127.2 m²/g, which was higher than that of CLW at 102.9 m²/g. The encapsulation efficiencies of CLWP and CHWP were 93.2% and 96.1% and the latent heats of fusion were 187.6 and 193.7 J/g, respectively. Paraffin wax filled in the micron-sized pores of the two kinds of charred woods well, and only physical binding occurred during encapsulation without chemical reactions. Under the simulated solar illumination, both CHWP and CLWP could use sunlight to heat themselves to above 55 ℃, and the temperature of CHWP was slightly higher than that of CLWP during both heating and cooling, indicating that the composite phase change energy storage materials prepared from the desiccated hemicellulose pretreated charred wood had better photothermal conversion efficiency and temperature regulation ability.

Key words: paraffin wax, hemicellulose, carbonated wood, composite phase change energy storage materials

CLC Number:

TQ35
TK02

Kaili LING, Linhan HE, Ruiqing REN, Yao CHEN, Jianmin GAO. Effect of Pretreatment Methods on Properties of Carbonized Wood-based Composite Phase Change Energy Storage Materials[J]. Chemistry and Industry of Forest Products, 2023, 43(3): 70-78.

Figures/Tables 10

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试样sample	熔融过程melting process			凝固过程solidification process			潜热latent heat/(J?g^-1)
试样sample	T_m1/℃	T_m2/℃	ΔH_m/(J?g^-1)	T_s1/℃	T_s2/℃	ΔH_s/(J?g^-1)	循环前before cycle	循环后after cycle
PW	24.6	45.5	201.3	51.0	32.1	200.9	—	—
CLWP	24.3	45.5	187.6	51.4	33.6	187.1	187.6	184.2
CHWP	24.7	45.7	193.7	51.6	33.8	192.8	193.7	191.2

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Effect of Pretreatment Methods on Properties of Carbonized Wood-based Composite Phase Change Energy Storage Materials

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