稻壳气化过程中碳微观结构及气化活性演变历程研究

何培红; 张伟伟; 黄胜; 吴幼青; 吴诗勇

doi:10.1016/S1872-5813(21)60060-9

稻壳气化过程中碳微观结构及气化活性演变历程研究

doi: 10.1016/S1872-5813(21)60060-9

1.
国电长源湖北生物质气化科技有限公司，湖北荆门 448000
2.
华东理工大学资源与环境工程学院，上海 200237

详细信息

作者简介:
何培红：E-mail：12060395@chnenergy.com.cn

通讯作者:
E-mail：huangs@ecust.edu.cn

中图分类号: TK6
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- 被引次数: 0
出版历程
- 收稿日期: 2021-01-22
- 修回日期: 2021-02-20
- 网络出版日期: 2021-03-12
- 刊出日期: 2021-06-30

Evolution of carbon microstructure and gasification activity during rice husk gasification

1.
Guodian Changyuan Hubei Biomass Gasification Technology Co., LTD, Jingmen 448000, China
2.
Resources and Environment Engineering Institute, East China University of Science and Technology, Shanghai 200237, China

摘要

摘要: 为探究高倍率循环流化床气化过程中生物质中碳微观结构及气化活性演变规律，在实验室固定床反应装置上对稻壳进行了高循环倍率气化过程模拟，并对稻壳热解焦及其不同次数循环气化后样品的孔隙结构、碳微观结构及气化活性进行了研究。结果表明，随着循环次数的增加，焦的比表面积呈现先增大后减小的趋势，但不同次数循环后焦的BET比表面积均明显高于稻壳热解焦。随着循环气化过程的进行，焦中碳的I_D1/I_G不断减小，即焦中碳结构有序程度不断提高，而A_D3+D4相对含量则先减小后稍有增加，但与热解焦相比均有所减小。在实验条件下不同次数循环后焦的气化活性均优于其热解焦，且随着循环次数的增加，焦的CO₂气化反应活性不断提高。
- 循环流化床 /
- 孔隙结构 /
- 碳微观结构 /
- 气化活性
Abstract: In order to investigate the evolution of carbon microstructure and gasification activity during circulating fluidized bed gasification, the simulated circulating gasification of a rice husk was carried out in a laboratory fixed bed reactor, and the pore structure, carbon microstructure and gasification activity of char during gasification were investigated. The results show that the BET surface area of char increases firstly and then decreases with an increase in gasification cycle times, and the surface areas of rice husk chars obtained from circulating gasification process are much higher than that of original char. The I_D1/I_G values of char decrease monotonously with an increase in gasification cycle times, indicating that the graphitization degree of carbon structure in char increases. Meanwhile, the relative content of A_D3+D4 of chardecreases firstly and then increases slightly with the progress of circulating gasification, and the relative contents of A_D3+D4 of all chars obtained from a circulating gasification process are lower than that of original char. Moreover, the gasification activity of char increases gradually with an increase in gasification cycle times, and the gasification activity of all chars obtained from a circulating gasification process are higher than that of original char.
- circulating fluidized bed gasifier /
- pore structure /
- carbon microstructure /
- gasification activity

HTML全文

FIG. 718. FIG. 718.

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图 1 样品的N₂吸附-脱附曲线（a）和孔径分布（b）

Figure 1 N₂ adsorption/desorption isotherms (a) and pore size distributions (b) of samples

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图 2 样品的拉曼光谱谱图

Figure 2 Raman spectra of samples

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图 3 样品的拉曼光谱拟合图

Figure 3 Raman spectra fitting bands of samples

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图 4 样品的CO₂气化活性

Figure 4 Gasification activities of samples

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表 1 稻壳的工业分析和元素分析

Table 1 Proximate and ultimate analyses of a rice husk

Proximate analysis w/%				Ultimate analysis w_d/%
M_ar	A_d	V_d	FC_d	C	H	N	$ {\rm{O}}^* $	S_t
9.15	15.44	69.28	15.28	43.53	4.67	0.44	35.89	0.03
ar-as received；d-dry basis；*-by difference

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表 2 稻壳的灰分组成

Table 2 Chemical compositions of ash in rice husk at a temperature of 823 K

Sample	Content w/%
Sample	SiO₂	K₂O	CaO	MgO	Na₂O	Al₂O₃	Fe₂O₃	TiO₂	P₂O₅	SO₃
RH	91.84	3.33	0.71	0.57	0.05	0.20	0.75	0.01	0.87	0.35

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表 3 稻壳不同次数循环后焦的基本性质

Table 3 Preliminary properties of samples

Sample	Proximate analysis w/%				Ultimate analysis w_d/%					x/%
Sample	M_ad	A_d	V_d	FC_d	C	H	N	O	S_t	x/%
RH-char	3.49	40.70	3.51	55.79	57.89	0.42	0.51	0.36	0.12	49.55
RH-1	2.24	48.26	3.01	48.73	50.38	0.54	0.42	0.3	0.09	62.97
RH-2	2.31	57.55	2.79	39.66	41.11	0.51	0.47	0.28	0.08	74.66
RH-3	2.69	65.25	2.67	32.08	33.41	0.52	0.46	0.27	0.10	81.84
RH-4	2.31	72.50	2.58	24.92	26.24	0.51	0.39	0.25	0.11	87.16
RH-5	2.07	82.47	2.48	15.05	16.22	0.55	0.39	0.22	0.14	93.02

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表 4 样品的孔结构参数

Table 4 Parameters of pore structure of samples

Sample	A/ (m²·g⁻¹)	v/ (cm³·g⁻¹)	d/nm
RH-char	27.01	0.01	35.37
RH-1	335.55	0.07	3.12
RH-2	410.16	0.12	3.81
RH-3	426.82	0.16	4.22
RH-4	407.81	0.18	4.43
RH-5	309.61	0.17	4.46

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表 5 样品拉曼光谱的碳结构参数

Table 5 Carbon structural parameters of samples

Parameters	RH-char	RH-1	RH-2	RH-3	RH-4	RH-5
D₁-FWHM/cm⁻¹	198.00	173.84	180.91	168.78	163.14	159.14
G-FWHM/cm⁻¹	71.49	58.55	58.86	55.67	62.69	61.11
G-D separation/cm⁻¹	245.17	249.42	251.55	252.08	253.68	255.82
I_D1/I_G	1.21	1.18	1.15	1.12	1.10	1.09
A_D3+D4/A_All (%)	18.75	17.19	16.97	16.52	17.03	17.25

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