原煤可磨性对气流床粉煤气化混配煤煤粉均匀程度的影响

刘霞; 潘婵婵; 陆海峰; 梁钦锋; 郭晓镭; 龚欣

原煤可磨性对气流床粉煤气化混配煤煤粉均匀程度的影响

华东理工大学煤气化及能源化工教育部重点实验室, 上海 200237

基金项目:

中石化科技开发项目 415022

详细信息

通讯作者:
刘霞, Tel: 021-64253933, Fax: 021-64251312, E-mail: lxia@ecust.edu.cn

中图分类号: TQ53
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- 被引次数: 0
出版历程
- 收稿日期: 2015-10-20
- 修回日期: 2015-12-17
- 网络出版日期: 2021-01-23
- 刊出日期: 2016-03-30

Effect of raw coal grindability on the uniformity of pulverized blended coal for entrained-flow pulverized coal gasification

Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China

Funds:

Sinopec Scientific and Technological Development Projects 415022

摘要

摘要: 以气流床粉煤气化工业装置不同时期的两组进料煤粉为研究对象, 在实验室按粒径对两组煤粉进行了筛分分组, 对分组后子煤粉进行了煤质、煤灰特性及反应活性分析, 研究了原煤可磨性差异对混配磨制后煤粉均匀程度的影响.结果表明, 原煤可磨性对混煤煤粉的颗粒粒径分布及其均匀性均具有影响.混配磨制煤粉的粒径主要取决于原煤中可磨性指数较小的原煤, 此原煤可磨性指数越小, 煤粉颗粒粒径越大; 可磨性相近的原煤混配制得的煤粉混合较均匀, 可磨性差异较大的原煤混配煤粉混合不均, 煤粉发生偏析, 使得大颗粒煤粉中含有过多的难磨煤, 导致煤粉的反应性能变差.
- 原煤 /
- 可磨性 /
- 粉煤气化 /
- 混配煤 /
- 煤粉 /
- 均匀程度
Abstract: Two pulverized coals taken from an entrained-flow pulverized coal gasification unit at different operating periods were adopted as the experimental materials, which were divided into two groups based on the partical size to investigate the effect of raw coal grindability on the uniformity of pulverized blended coal. The coal quality and the ash character of the subsamples were analyzed as well. The results show that the grindability of raw coal has a great influence on the partical size distribution and the uniformity of pulverized blended coal, and the partical size distribution of blended coal is mainly depended on the raw coal with a smaller grindability index. The smaller the raw coal's grindability index, the larger the particle size of the pulverized blended coal. It is therefore concluded that the pulverized blended coal made from similar grindability raw coals is more uniform. On the other hand, different grindabilities of raw coals lead to nonuniformity and segregation of the pulverized blended coal and induce an accumulation of hard coal in the large particles, which will cause the reactivity of the pulverized blended coal decrease.
- raw coal /
- grindability /
- pulverized coal gasification /
- blended coal /
- pulverized coal /
- uniformity

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图 1 煤粉粒径分布

Figure 1 Particle size distribution of raw coals

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图 2 子煤粉灰分随煤粉粒径的变化

Figure 2 Variation of ash content with the coal particle size

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图 3 子煤粉挥发分随煤粉粒径的变化

Figure 3 Variation of volatile content with the coal particle size

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图 4 C元素含量随煤粉粒径的变化

Figure 4 Variation of C content with the coal particle size

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图 5 O元素含量随煤粉粒径的变化

Figure 5 Variation of O content with the coal particle size

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图 6 煤灰流动温度(FT) 随煤粉粒径的变化

Figure 6 Variation of FT with the coal particle size

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图 7 GS煤焦碳转化率随时间的变化

Figure 7 Curves of conversion vs time for GS char

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图 8 JS煤焦碳转化率随时间的变化

Figure 8 Curves of conversion vs time for GS char

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表 1 原煤样品煤质分析

Table 1 Proximate and ultimate analysis of raw coals

Sample	Proximate analysis w_ad/%				Ultimate analysis w_d/%					HGI
Sample	M	A	V	FC	C	H	O	N	S	HGI
SH	3.98	8.53	31.58	56.53	72.26	4.35	9.93	0.98	0.59	65
GZ	0.63	18.98	8.40	71.99	72.81	1.97	0.56	1.03	4.02	71
JC	0.62	17.87	5.68	75.83	75.78	2.49	0.34	0.66	2.24	35

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表 2 原煤灰成分分析及熔融特性

Table 2 Chemical composition and fusibility property of raw coal ashes

Sample	Ash chemical composition w/%											Ash fusion temperature t/℃
Sample	SiO₂	Al₂O₃	Fe₂O₃	CaO	MgO	Na₂O	K₂O	SO₃	P₂O₅	TiO₂	other	DT	ST	HT	FT
SH	44.83	20.42	6.98	13.07	1.20	3.10	0.74	8.45	0.08	0.72	0.41	1 142	1 159	1 164	1 172
GZ	47.80	33.08	8.36	2.94	0.59	0.29	0.92	2.56	0.53	2.73	0.20	1 271	1 345	1 359	1 373
JC	49.22	36.75	6.68	2.51	0.51	0.23	0.73	1.89	0.06	1.27	0.15	1 345	1 493	1 524	1 532

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表 3 工业煤粉的煤质分析

Table 3 Proximate and ultimate analysis of pulverized coals

Sample	Proximate analysis w_ad/%				Ultimate analysis w_ad/%
Sample	M	A	V	FC	C	H	O	N	S
GS	1.73	16.02	17.28	64.97	71.12	3.19	4.02	0.94	2.98
JS	1.33	13.13	18.16	67.38	76.12	3.18	3.99	0.80	1.45

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表 4 工业煤粉的灰成分分析

Table 4 Chemical composition and fusibility property of pulverized coal ashes

Sample	Ash chemical composition w/%											Ash fusion temperature t/℃
Sample	SiO₂	Al₂O₃	Fe₂O₃	CaO	MgO	Na₂O	K₂O	SO₃	P₂O₅	TiO₂	other	DT	ST	HT	FT
GS	45.94	28.83	7.51	5.91	0.66	0.63	1.09	6.02	0.71	2.35	0.35	1 217	1 294	1 301	1 308
JS	48.01	30.73	7.22	5.80	0.80	0.87	0.82	4.25	0.12	1.11	0.27	1 285	1 328	1 333	1 352

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表 5 子煤粉体积平均粒径

Table 5 Average particle size of subsamples

Sample	Particle size d/μm
Sample	raw coal	< 325 mesh	325 mesh -180 mesh	>180 mesh
GS	74.68	22.10	70.25	153.97
JS	96.40	36.30	85.10	205.52

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表 6 子煤粉的工业分析

Table 6 Proximate analysis of subsamples

Sample	Particle size d/μm	Proximate analysis w/%
Sample	Particle size d/μm	M_ad	A_ad	A_d	V_ad	V_d	FC_ad	FC_d
GS	22.10	2.10	17.29	17.66	15.56	15.90	65.04	66.44
GS	70.25	2.32	17.14	17.54	16.54	16.92	64.01	65.53
GS	153.97	2.75	14.68	15.10	19.65	20.20	62.92	64.70
JS	36.30	3.34	16.88	17.46	20.80	21.52	58.98	61.02
JS	85.10	3.40	12.40	12.84	20.64	21.38	63.55	65.79
JS	205.52	2.90	9.18	9.46	16.32	16.80	71.60	73.74

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表 7 子煤粉的元素分析

Table 7 Ultimate analysis of subsamples

Sample	Particle size d/μm	Ultimate analysis w/%
Sample	Particle size d/μm	N_ad	C_ad	H_ad	S_ad	O_ad
GS	22.10	0.96	69.44	3.08	3.59	3.77
GS	70.25	0.95	69.18	3.43	3.20	4.05
GS	153.97	0.94	69.37	4.36	3.41	4.80
JS	36.30	0.76	66.50	3.38	1.73	7.79
JS	85.10	0.82	71.94	3.62	1.44	6.75
JS	205.52	0.82	78.26	3.23	1.33	4.61

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表 8 子煤粉煤灰成分分析

Table 8 Chemical composition of subsamples

Sample	Particle size d/μm	Content w/%
Sample	Particle size d/μm	SiO₂	Al₂O₃	CaO	Fe₂O₃	SO₃	MgO	K₂O	TiO₂	Na₂O	P₂O₅
GS	22.10	45.44	26.69	7.02	8.12	7.50	0.63	1.15	2.10	0.42	0.66
GS	70.25	46.26	28.98	5.04	8.62	5.59	0.55	1.01	2.35	0.51	0.78
GS	153.97	44.93	29.23	5.44	9.67	4.98	0.64	0.85	2.56	0.73	0.64
JS	36.30	47.13	27.98	6.18	8.88	6.18	0.76	0.80	0.98	0.79	0.12
JS	85.10	46.84	29.66	5.68	8.12	5.57	0.92	0.74	1.11	1.03	0.14
JS	205.52	47.87	32.38	4.48	7.27	4.12	0.86	0.64	1.15	0.90	0.13

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表 9 子煤粉煤灰熔融特性

Table 9 Fusibility property of pulverized coal ashes of subsamples

Sample	Particle size d/μm	Temperature t/℃
Sample	Particle size d/μm	DT	ST	HT	FT
GS	22.10	1 131	1 266	1 276	1 292
GS	70.25	1 142	1 278	1 289	1 296
GS	153.97	1 266	1 302	1 308	1 313
JS	36.30	1 204	1 280	1 288	1 296
JS	85.10	1 253	1 317	1 322	1 330
JS	205.52	1 299	1 362	1 374	1 388

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表 10 煤焦的气化反应性指数

Table 10 Reactivity index of chars

Sample	Particle size d/μm	t_0.5 /min	R_0.5 /min^-1
GS raw coal	74.68	1.36	0.367 6
GS	22.10	0.97	0.515 5
GS	70.25	1.27	0.393 7
GS	153.97	1.80	0.277 8
JS raw coal	96.40	2.58	0.193 8
JS	36.30	0.61	0.819 7
JS	85.10	1.38	0.362 3
JS	205.52	3.88	0.128 9

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