钢渣基高反应性焦炭气孔结构的溶损演化行为

doi:10.16085/j.issn.1000-6613.2018-2273

摘要/Abstract

摘要：

在工业配合煤中添加1%钢渣制备高反应性焦炭，采用低温氮气吸附法分析高反应性焦炭（HRC）和普通焦炭（BC）在1100℃下溶损不同比率碳素（5%~50%）后焦炭的气孔结构，并结合分形理论研究焦炭溶损反应过程中孔结构的演化特性。结果表明，随着碳素的溶损，HRC的吸脱附曲线的变化幅度比BC的大，吸附等温线由Ⅰ型向Ⅱ型的转变较晚；焦炭的比表面积和微孔孔容随碳素的溶损先增大后减小、总孔容逐渐增大，而HRC的比表面积增率（ΔS _BET /Δx）比BC的大，孔径分布也相对较宽；HRC的分形维数D ₁和D ₂随碳素溶损而变化趋势与BC的有较大差异。这说明高反应性焦炭中的钢渣通过增加了焦炭表面上活性点影响焦炭溶损过程中气孔结构的演化行为。

关键词: 高反应性焦炭, 溶损反应, 气孔结构, 演化

Abstract:

High reactive coke was prepared by adding 1% steel slag to industrial blend coal. The porous structures of the high reactive coke (HRC) and base coke (BC) with different carbon loss ratio (5%~50%) were investigated by N₂ adsorption/desorption at 1100℃. Evolution characteristics of porous structures for cokes were studied by fractal theory during solution loss reaction. The results indicate that the variation of adsorption/desorption isotherms for HRC is larger than that of BC during solution loss reaction, and the transformation of adsorption isotherms for HRC from type Ⅰ to Ⅱ lags behind that of BC. The specific surface area (SSA) and micropore volume of cokes increase first and then decrease during the solution loss of carbon, and the total pore volumes of cokes increase gradually. However, the growth rate of SSA for HRC (ΔS _BET/Δx) is larger than that of BC, and the pore size distribution of HRC is relatively wide. Furthermore, the trends of fractal dimension D ₁ and D ₂ for HRC are different from that of BC during the solution loss of carbon. Therefore, it is shown that the steel slag in high reactivity coke has a great effect on the evolution behavior of porous structure for cokes during solution loss reaction by increasing the active sites on the coke surface.

Key words: high reactivity coke, solution loss reaction, porous structures, evolution

中图分类号:

TQ520.1

梁磊, 孙章, 梁英华. 钢渣基高反应性焦炭气孔结构的溶损演化行为[J]. 化工进展, 2019, 38(07): 3136-3142.

Lei LIANG, Zhang SUN, Yinghua LIANG. Evolution of the porous structures for the high reactivity coke prepared by adding steel slag in blending coals during solution loss reaction[J]. Chemical Industry and Engineering Progress, 2019, 38(07): 3136-3142.

图/表 10

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x /%	C _max/mL·g^-1		V _total/μL·g^-1		V _micro/μL·g^-1		D _a/nm
x /%	BC	HRC	BC	HRC	BC	HRC	BC	HRC
0	5.74	3.30	8.9	5.10	2.9	0.7	5.62	6.84
5	12.09	9.31	18.7	14.40	10.1	7.5	3.51	3.66
10	16.12	19.50	24.9	23.2	11.7	12.3	3.83	3.48
20	19.68	24.35	30.4	25.8	14.3	17.6	3.87	3.88
30	16.18	19.43	30.5	29.9	11.6	12.0	3.96	4.40
40	14.36	18.37	33.6	28.4	8.8	10.5	4.57	4.72
50	14.31	17.24	38.7	35.4	9.1	10.2	4.43	4.68

x /%	C _max/mL·g^-1		V _total/μL·g^-1		V _micro/μL·g^-1		D _a/nm
x /%	BC	HRC	BC	HRC	BC	HRC	BC	HRC
0	5.74	3.30	8.9	5.10	2.9	0.7	5.62	6.84
5	12.09	9.31	18.7	14.40	10.1	7.5	3.51	3.66
10	16.12	19.50	24.9	23.2	11.7	12.3	3.83	3.48
20	19.68	24.35	30.4	25.8	14.3	17.6	3.87	3.88
30	16.18	19.43	30.5	29.9	11.6	12.0	3.96	4.40
40	14.36	18.37	33.6	28.4	8.8	10.5	4.57	4.72
50	14.31	17.24	38.7	35.4	9.1	10.2	4.43	4.68

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