Carbon-ash separation of coal gasification slag in swirling water based on apparent density

doi:10.16085/j.issn.1000-6613.2020-0912

Abstract

Abstract:

The gasification of coal produced a large number of slags, which results in serious environmental problems. Hence, the comprehensive utilization of gasification slag is urgent. In this paper, the characteristics of different density components in the coal gasification slag were analyzed systematically, which indicates that the separation of carbon and ash was the premise and foundation for the utilization of coal gasification slag. A method of carbon-ash separation based on the apparent density difference is proposed. Water-only cyclone was used as separation equipment and single-factor tests were carried out to determine the main process parameters on the separation effect of carbon and ash. It proved the feasibility of the water-only cyclone for >0.074mm carbon-ash separation. By means of Box-Behnken Design, the quantitative relationship between the cone angle of the water-only cyclone, the apex diameter, the vortex finder depth and the ash content, the yield, the comprehensive efficiency of separation is analyzed, which provides data support for the prediction of carbon-ash separation effect and the selection of cyclone structure parameters. The results provide guidance for the utilization of coal gasification slag.

Key words: coal gasification slag, apparent density, carbon-ash separation, water-only cyclone

摘要：

煤气化利用过程中会产生大量气化渣，造成很大的环境污染，其综合利用势在必行。本文系统分析了煤气化渣不同密度组分的特性，明确了炭-灰分离是煤气化渣分质综合利用的前提与基础，并提出了基于视密度差异的炭-灰分离方法。以水介质旋流器为分选设备，通过单因素试验确定了主要工艺参数对炭-灰分离效果的影响规律，验证了水介质旋流分选对煤气化渣>0.074mm粒级炭-灰分离的可行性。借助Box-Behnken试验设计分析了旋流器锥体角度、底流口直径、溢流管插入筒体深度与产品灰分、产品产率及分选综合效率的定量关系，为煤气化渣炭-灰分离效果的预测及旋流器结构参数的选择提供了数据支持。本文研究内容对实现煤气化渣分质资源化利用具有指导意义。

关键词: 煤气化渣, 视密度, 炭-灰分离, 水介质旋流器

CLC Number:

TD94

LI Huize, DONG Lianping, BAO Weiren, WANG Jiancheng, FAN Panpan, FAN Minqiang. Carbon-ash separation of coal gasification slag in swirling water based on apparent density[J]. Chemical Industry and Engineering Progress, 2021, 40(3): 1344-1353.

李慧泽, 董连平, 鲍卫仁, 王建成, 樊盼盼, 樊民强. 基于视密度的煤气化渣水介质旋流炭-灰分离[J]. 化工进展, 2021, 40(3): 1344-1353.

Figures/Tables 19

References 23

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粒级/mm	产率 /%	灰分 /%	筛上累积		筛下累积
粒级/mm	产率 /%	灰分 /%	产率/%	灰分/%	产率/%	灰分/%
合计	100.00	71.85
>0.25	0.88	50.86	0.88	50.86	100.00	71.85
0.25~0.125	8.81	48.75	9.69	48.94	99.12	72.03
0.125~0.074	8.44	59.16	18.13	53.70	90.31	74.30
0.074~0.045	8.55	72.06	26.68	59.58	81.87	75.86
<0.045	73.32	76.31	100.00	71.85	73.32	76.31

粒级/mm	产率 /%	灰分 /%	筛上累积		筛下累积
粒级/mm	产率 /%	灰分 /%	产率/%	灰分/%	产率/%	灰分/%
合计	100.00	71.85
>0.25	0.88	50.86	0.88	50.86	100.00	71.85
0.25~0.125	8.81	48.75	9.69	48.94	99.12	72.03
0.125~0.074	8.44	59.16	18.13	53.70	90.31	74.30
0.074~0.045	8.55	72.06	26.68	59.58	81.87	75.86
<0.045	73.32	76.31	100.00	71.85	73.32	76.31

样品	工业分析			元素分析
样品	M_ad	A_d	V_daf	H_ad	C_ad	N_ad	S_t,ad
原样	0.38	57.42	3.26	0.23	40.69	0.26	0.50
浮物	0.76	29.28	4.85	0.33	66.05	0.30	0.37
沉物	0.26	95.98	1.80	0.17	4.34	0.06	0.44

样品	工业分析			元素分析
样品	M_ad	A_d	V_daf	H_ad	C_ad	N_ad	S_t,ad
原样	0.38	57.42	3.26	0.23	40.69	0.26	0.50
浮物	0.76	29.28	4.85	0.33	66.05	0.30	0.37
沉物	0.26	95.98	1.80	0.17	4.34	0.06	0.44

样品	SiO₂	Fe₂O₃	TiO₂	P₂O₅	CaO	MgO	Al₂O₃	SO₃	K₂O	Na₂O	MnO₂
原样	55.22	7.78	0.85	0.08	8.75	1.10	20.00	1.72	1.80	1.10	0.138
浮物	52.24	6.35	0.86	0.13	10.83	1.12	19.78	2.92	1.81	1.19	0.142
沉物	56.24	8.39	0.85	0.05	7.62	1.10	20.05	1.14	1.81	1.06	0.137