碱金属对生物质热解特性的影响

doi:10.3969/j.issn.0253-2417.2020.04.016

Abstract

Abstract:

The thermogravimetric analyzer and Fourier transform infrared spectroscopy (TG-FT-IR) were used to experimentally study rice straw, husks, different nitric acid washed samples and alkali metal ion impregnated samples, which analyzed the effect of external alkali metals impregnation on biomass pyrolysis characteristics. The pyrolysis TG/DTG curves and gas-generating components of the original sample, acidly washed sample and alkali metal solution impregnated sample were compared, it was found that the impregnation of alkali metal solution greatly increased the content of alkali metal elements in the sample and promoted the formation of active cellulose. Thus, the main weight loss interval of the pyrolysis of the sample was moved forward, and the maximum weight loss rate of pyrolysis was reduced; the pyrolysis yields of K⁺, Na⁺ impregnated rice stalks and rice hulls were increased by 5.3%, 7.89%, and 10.95%, 11.59%, the order of pyrolysis coke yields was sodium chloride immersion sample > potassium chloride immersion sample > original samples > acidly wased sample, and K⁺ pyrolysis catalytic ability was stronger than Na⁺; K⁺, Na⁺ immersion sample were good for biomass ring-opening reaction, promoted the decarboxylation and decarbonylation reactions, and increased the production of CO₂, CO, and hydroxyketones.

Key words: biomass, alkali metal, acidly washing, impregnation, pyrolysis characteristics

CLC Number:

TQ131.1
TK6

Liyang JIANG,Zhen ZHOU,Hong TIAN,Jiexia ZHAO. Effect of Alkali Metal Impregnation on Pyrolysis Characteristics of Biomass[J]. Chemistry and Industry of Forest Products, 2020, 40(4): 114-122.

Figures/Tables 8

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Table 2

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Table 3

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References 21

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样品 samples	工业分析proximate analysis¹⁾/%				元素分析ultimate analysis/%					低位热值/(kJ·kg^-1) low calorific value
样品 samples	M	V	A	FC	C	H	S	N	O	低位热值/(kJ·kg^-1) low calorific value
稻秆rice stalk	4.99	64.13	12.97	17.91	44.27	6.82	0.36	1.03	29.56	17636
谷壳rice husk	5.84	65.87	9.04	19.25	47.73	6.34	0.91	1.01	29.13	16017

	样品samples	K	Na
稻秆 rice stalk	原料material	24.2974	0.4711
	酸洗acidly washing	0.0965	0.0328
	KCl浸渍KCl impregnating	67.5769	-
	NaCl浸渍NaCl impregnating	-	61.8163
谷壳 rice husk	原料material	5.0932	0.3285
	酸洗acidly washing	0.0522	0.0123
	KCl浸渍KCl impregnating	32.0985	-
	NaCl浸渍NaCl impregnating	-	56.8187

样品samples		最大热解失重峰温度/℃ maximum pyrolysis peak temperature	最大热解失重速率/(%·min^-1) maximum pyrolytic weight loss rate	固体产物得率/% yield of solid product
稻秆rice stalk	原料material	339	16.54	31.56
	酸洗acidly washing	341	22.06	27.68
	KCl浸渍KCl impregnating	334	18.07	32.98
	NaCl浸渍NaCl impregnating	331	17.05	35.54
谷壳 rice husk	原料material	349	15.13	32.77
	酸洗acidly washing	350	21.96	23.56
	KCl浸渍KCl impregnating	339	17.67	34.51
	NaCl浸渍NaCl impregnating	317	16.75	35.15

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Effect of Alkali Metal Impregnation on Pyrolysis Characteristics of Biomass

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