Effect of acid pickling and phosphoric acid impregnation on pyrolysis characteristics of duckweed

doi:10.3969/j.issn.2097-0706.2023.05.005

Abstract

Abstract:

Based on the deficiencies of the researches on duckweed pyrolysis， the effects of duckweed pyrolysis and phosphorus on the characteristics of pyrolysis gas products were explored. Pickling and phosphoric acid impregnation were used to treat duckweed，and their treatment effects on the pyrolysis characteristics and gas product characteristics of duckweed were investigated by TG-FTIR. It was found that pickling significantly reduced the ash content of duckweed and changed its ash components. In addition， pickling increased the contents of C， H， N and O， and increased the calorific value of the samples. Thermogravimetric results showed that duckweed pyrolysis was mainly divided into four stages. Pyrolysis reaction mainly occurred between 145 and 520 ℃， and the pyrolysis DTG curve showed bimodal distribution. Pickling resulted in a 10 ℃ initial temperature rise， drops of solid product yield after duckweed pyrolysis and the maximum weight loss temperature， and an increase of the maximum weight loss rate. Phosphoric acid impregnation significantly increased the yield of solid products of duckweed pyrolysis， and decreased the maximum weight loss temperature and the maximum weight loss rate. Pickling increased the content of CH₄， while phosphoric acid impregnation significantly facilitated the production of CH₄， CO₂ and NH₃， and greatly widened the release range of NH₃.

Key words: duckweed, acid pickling, phosphoric acid, impregnation, pyrolysis, thermogravimetry, CH₄, CO₂, NH₃

CLC Number:

YANG Wei, LYU Leida, PENG Shiyang, LI Wei, CAI Hongchun, HAN Yong, ZHU Youjian, YANG Haiping, ZHAO Hai. Effect of acid pickling and phosphoric acid impregnation on pyrolysis characteristics of duckweed[J]. Integrated Intelligent Energy, 2023, 45(5): 39-45.

Figures/Tables 7

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项目		DW	ADW
工业分析/%	w(A)	21.38	6.98
	w(V)	69.91	72.64
	w(FC)	8.71	20.38
元素分析/%	w(C)	36.36	44.70
	w(H)	5.38	6.39
	w(N)	5.34	6.63
	w(S)	0.48	0.37
	w(O)	31.06	34.93
Q_HHV/(MJ·kg^-1)		15.41	19.40
主要成分质量分数/%	纤维素	14.26
	蛋白质	21.50
	淀粉	47.80
	木质素	1.16

样品	灰分质量分数
样品	K₂O	CaO	Na₂O	MgO	Al₂O₃	SiO₂	P₂O₅	Fe₂O₃
DW	17.71	33.72	2.74	6.08	2.06	17.27	16.91	3.51
ADW	0.66	0.53	3.33	0.81	2.15	78.13	12.81	1.59

样品	热解初温/℃	t_max/℃	v_DTG,max/ (%·min^-1)	热解终温/℃	失重率/%
DW	145	320	-4.16	520	37.08
ADW	155	300	-4.32	510	30.43
ADW-5P	150	275	-3.31	530	38.65
ADW-10P	145	255	-2.99	540	44.19
ADW-20P	145	230	-3.02	550	49.49