CO<sub>2</sub>气氛下生物质焦气化反应动力学模型研究:Ⅱ.指数前因子

汪小憨; 宋谦石; 曾小军; 吴勇

CO₂气氛下生物质焦气化反应动力学模型研究:Ⅱ.指数前因子

汪小憨^{1, 2, ,},
宋谦石^{1, 3},
曾小军^{1, 2},
吴勇^{1, 3}

1.
中国科学院广州能源研究所, 广东广州 510640
2.
中国科学院可再生能源重点实验室, 广东广州 510640
3.
中国科学院大学, 北京 100049

基金项目:

国家自然科学基金 51276184

详细信息

通讯作者:
汪小憨, Tel: 020-37023546，E-mail: wangxh@ms.giec.ac.cn

中图分类号: TK6
计量
- 文章访问数: 91
- HTML全文浏览量: 30
- PDF下载量: 14
- 被引次数: 0
出版历程
- 收稿日期: 2017-01-11
- 修回日期: 2017-03-14
- 网络出版日期: 2021-01-23
- 刊出日期: 2017-05-10

Modeling study on the biomass char gasification kinetics under CO₂ atmosphere: Ⅱ. Pre-exponential factor

WANG Xiao-han^{1, 2
, ,},
SONG Qian-shi^{1, 3},
ZENG Xiao-jun^{1, 2},
WU Yong^{1, 3}

1.
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
2.
Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou 510640, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China

Funds:

the National Natural Science Foundation of China 51276184

摘要

摘要: 基于简单碰撞理论，建立了生物质焦炭CO₂气化反应速率的计算方法，找出了表征指数前因子大小的关键组合参数。在此基础上，对六种生物质及其脱灰焦炭的物理化学特性进行了检测分析，利用热重分析仪在800-1000 ℃对各种生物质进行了CO₂等温气化实验，将得到的指数前因子实验数据与模型分析结果进行对比。研究表明，指数前因子与构建的组合参数之间存在较好的相关性，建立的通用关系式可为气化反应规律的进一步阐明提供有益的参考。
- 生物质焦炭 /
- CO₂气化 /
- 简单碰撞理论 /
- 指数前因子 /
- 模型研究
Abstract: Based on the simple collision theory (SCT), the calculation method of biomass char gasification rate was developed and the combined parameters to characterize the pre-exponential factor were found. Furthermore, some experimental tests for six acid-washed biomass chars, such as the isothermal gasification and so on, were performed under CO₂ atmosphere, using a thermo-gravimetric analyzer (TGA) over the temperature ranges of 800-1000 ℃, respectively. Through the comparison of experimental data and modeling results, it is found that a good agreement is made and the developed model equations can provide an effective guidance to clarify the general gasification law of biomass chars.
- biomass char /
- CO₂ gasification /
- simple collision theory /
- pre-exponential factor /
- modelling

HTML全文

图 1 焦炭制备系统示意图

Figure 1 Schematic diagram of char production system

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图 2 生物质焦炭的XRD谱图

Figure 2 XRD analysis of biomass chars

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图 3 生物质脱灰焦的气化反应速率

□：800 ℃；○：850 ℃；△：900 ℃；▽：925 ℃；◇：950 ℃；◁：975 ℃；▷：1 000 ℃

Figure 3 Gasification reaction rate of acid-washed chars

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图 4 不同生物质焦炭参数β随温度的变化

Figure 4 Effect of temperature on the parameter β

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图 5 初始气化反应速率计算和实验结果的对比

Figure 5 Comparison between experimental and simulation results

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表 1 生物质样品的工业分析和元素分析

Table 1 Proximate analysis and ultimate analysis of samples

Biomass sample	Proximate analysis w_d/%			Ultimate analysis w_d/%					Average molecular weight /(g·mol^-1)
Biomass sample	V	FC	A	C	H	N	S	O	M_v
SS-de	55.45	10.66	33.89	31.41	4.45	1.01	0.29	28.95	43.5
ML-de	68.66	17.11	14.23	40.57	5.05	1.60	0.24	38.31	45.5
PS-de	80.38	15.54	4.08	46.05	6.16	0.12	0.06	43.53	60.7
CC-de	73.86	16.43	9.71	41.09	5.69	0.49	0.08	42.94	50.6
RH-de	65.64	16.02	18.34	37.55	5.41	1.05	0.18	37.47	40.8
BS-de	68.27	24.59	7.14	43.19	5.97	0.97	0.07	42.66	31.5

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表 2 生物质焦炭的无机元素分析

Table 2 Inorganic component analysis of biomass chars

Char sample	Content w_d/%
Char sample	K	Na	Ca	Mg
SS char	1.638	0.023	1.870	1.067
ML char	1.102	0.005	13.11	0.600
PS char	0.462	0.003	0.737	0.139
CC char	2.112	0.010	0.576	0.430
RH char	0.785	0.078	0.401	0.136
BS char	4.831	0.057	0.513	0.251
SS-de char	0.167	0.012	0.092	0.065
ML-de char	0.075	0.003	0.054	0.019
PS-de char	0.070	0.002	0.170	0.031
CC-de char	0.176	0.015	0.099	0.080
RH-de char	0.053	0.008	0.020	0.014
BS-de char	0.106	0.010	0.056	0.017

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表 3 焦样的粒径分析

Table 3 Particle size analysis of biomass chars

Char sample	Particle size d/μm
Char sample	median diameter	area-averaged diameter	volume-averaged diameter
SS-de char	26.006	19.019	31.469
ML-de char	22.579	14.604	37.348
PS-de char	49.929	30.655	60.904
CC-de char	25.791	17.601	30.39
RH-de char	8.658	4.72	30.32
BS-de char	20.392	13.951	26.968

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表 4 生物质脱灰焦的初始反应速率

Table 4 Initial gasification reaction rate of acid-washed chars

Char sample	r_c0 (1/min)
Char sample	800 ℃	850 ℃	900 ℃	925 ℃	950 ℃	975 ℃	1 000 ℃
SS-de char	0.002 8	0.007 5	0.033 0	0.049 6	0.107 3	0.140 2	0.231 0
ML-de char	0.001 0	0.003 3	0.008 2	0.013 2	0.023 5	0.039 0	0.066 8
PS-de char	0.008 1	0.025 4	0.064 0	0.093 0	0.153 1	0.287 4	0.350 0
CC-de char	0.001 2	0.004 0	0.015 9	0.028 2	0.042 0	0.073 0	0.124 2
RH-de char	0.000 9	0.001 8	0.006 9	0.013 0	0.016 8	0.034 6	0.058 7
BS-de char	0.000 8	0.002 3	0.008 7	0.013 1	0.024 6	0.042 9	0.062 9

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表 5 孔隙平均长度与焦炭表观直径的比例系数β

Table 5 Ratio of average pore length to char apparent diameter for different acid-washed chars

Char sample	β (m/m)
Char sample	800 ℃	850 ℃	900 ℃	925 ℃	950 ℃	975 ℃	1 000 ℃
SS-de char	2.34×10^-3	1.34×10^-3	1.43×10^-3	1.11×10^-3	1.27×10^-3	9.02×10^-4	8.28×10^-4
ML-de char	1.49×10^-3	1.01×10^-3	6.19×10^-4	5.13×10^-4	4.84×10^-4	4.37×10^-4	4.16×10^-4
PS-de char	5.28×10^-3	3.52×10^-3	2.16×10^-3	1.62×10^-3	1.41×10^-3	1.44×10^-3	9.77×10^-4
CC-de char	1.37×10^-3	9.96×10^-4	9.53×10^-4	8.71×10^-4	6.88×10^-4	6.50×10^-4	6.16×10^-4
RH-de char	3.69×10^-3	1.55×10^-3	1.46×10^-3	1.42×10^-3	9.71×10^-4	1.09×10^-3	1.03×10^-3
BS-de char	1.40×10^-3	8.48×10^-4	7.76×10^-4	6.03×10^-4	6.00×10^-4	5.69×10^-4	4.64×10^-4

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