水蒸气气氛下牦牛粪动力学特性研究

doi:10.3969/j.issn.1673-5854.2023.03.007

Abstract

Abstract:

The thermal weight loss characteristics of yak dung under water vapor atmosphere was investigated via the thermogravimetric analysis. The Flynn-Wall-Ozawa method, master plot method/Kissinger method and continuous coupling method of distributed activation energy model(DAEM) were used to analyze the reaction mechanism and calculate kinetic parameters of the pyrolysis process. The results showed that yak dung steam gasification process was mainly divided into two stages, namely the pyrolysis reaction stage and the gas-solid reaction stage. The steam could slightly inhibit the pyrolysis reaction and significantly promote the gas-solid reaction. The kinetic analysis demonstrated that the reaction order mechanism model(the reaction-orders of the pyrolysis stage and the gas-solid reaction stage were 2.40 and 1.17, respectively) had good adaptability to the kinetic process of yak dung steam gasification. The activation energies of the hemicellulose, cellulose and lignin in pyrolysis stage were 169.32, 185.76 and 219.52 kJ/mol, respectively. The activation energies of the pyrolysis carbon condensation reaction and the steam gas-solid reaction in the gas-solid reaction stage were 275.59 and 312.44 kJ/mol, respectively.

Key words: livestock manure, steam gasification, thermogravimetric analysis, kinetic

CLC Number:

TQ35
TK6

Zi'ang NI, Zhufu FU, Yuan XUE. Kinetic Characteristics of Yak Dung Under Steam Atmosphere[J]. Biomass Chemical Engineering, 2023, 57(3): 49-55.

Figures/Tables 7

Table 1

Fig.1

Fig.2

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Fig.5

Table 2

References 22

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反应机理 reaction mechanism	符号 symbol	f(α)	g(α)
一级反应 first-order reaction	O1	(1-α)	-ln(1-α)
二级反应 second-order reaction	O2	(1-α)²	(1-α)^-1-1
三级反应 third-order reaction	O3	(1-α)³	[(1-α)^-2-1]/2
四级反应 fourth-order reaction	O4	(1-α)⁴	[(1-α)^-3-1]/2
一维扩散 one-dimensional diffusion	D1	(1/2) α	α²
二维扩散 two-dimensional diffusion	D2	[-ln(1-α)]^-1	(1-α)ln(1-α)+ α
三维扩散 three-dimensional diffusion(Jander)	D3	(3/2)(1-α)^2/3[1-(1-α)^1/3]^-1	[1-(1-α)^1/3]²
四维扩散 four-dimensional diffusion(Ginstling-Brounstein)	D4	(3/2)[(1-α)^-1/3-1]^-1	(1-2/3 α)-(1-α)^2/3
相界反应 phase-boundary controlled reaction	R2	2(1-α)^1/2	1-(1-α)^1/2
相界反应 phase-boundary controlled reaction	R3	3(1-α)^2/3	1-(1-α)^1/3
随机成核 random nucleation	A2	2(1-α)[-ln(1-α)]^1/2	[-ln(1-α)]^1/2
随机成核 random nucleation	A3	3(1-α)[-ln(1-α)]^2/3	[-ln(1-α)]^1/3
随机成核 random nucleation	A4	4(1-α)[-ln(1-α)]^3/4	[-ln(1-α)]^1/4
幂定律 power law	P2	2 α^1/2	α^1/2
幂定律 power law	P3	3 α^2/3	α^1/3
幂定律 power law	P4	4 α^3/4	α^1/4

反应阶段 reaction stage	平行反应 parallel reaction	活化能(E)/(kJ·mol^-1) activation energy	标准差(σ)/(kJ·mol^-1) standard deviation	比例系数¹⁾ proportionality coefficient
热解阶段 pyrolysis stage	半纤维素热解 hemicellulose pyrolysis	169.315	4.54	36.990
	纤维素热解 cellulose pyrolysis	185.755	0.01	36.995
	木质素热解 lignin pyrolysis	219.520	8.19	6.552 5
气固反应阶段 gas-solid reaction stage	热解炭缩合反应 pyrolytic carbon condensation reaction	275.590	0.01	0.447 5
气固反应阶段 gas-solid reaction stage	水蒸气气固反应 steam gas-solid reaction	312.435	38.52	19.015

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Kinetic Characteristics of Yak Dung Under Steam Atmosphere

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