Study on improving slurryability of lignite based on coal blending and surface modification

doi:10.11949/0438-1157.20201242

Abstract

Abstract:

To improve the slurryability of lignite and make it meet the demand of coal water slurry gasification, the coal blending with petroleum coke and kerosene as surface modifier were used to study the influence of modification methods on the slurryability of lignite. The results show that: (1) Due to the strong hydrophobicity of petroleum coke, the slurry concentration of lignite can be increased by adding petroleum coke, and the slurry concentration is positively correlated with the mass fraction of solid particles α of petroleum coke. (2) The surface modification of kerosene mixed particles can enhance the hydrophobicity of kerosene particles and increase the concentration of coal coke slurry. The viscosity decreases at first and then increases with β. The optimum dosage of kerosene is negatively related to α (α > 10.0%). (3) When a small amount of petroleum coke is added (α < 1.0%), the surface roughness of lignite can be increased within a certain range, kerosene modification effect can be improved, and the viscosity of coal coke slurry can be reduced.

Key words: coal, petroleum coke, coal blending, kerosene surface modification, slurryability

摘要：

为改善褐煤成浆性，使其满足水煤浆气化需求，利用石油焦配煤，煤油作为表面修饰剂，研究改性方式对褐煤成浆性的影响。结果表明：（1）石油焦具有较强的疏水性，添加石油焦配煤显著提高褐煤的成浆浓度，且成浆浓度与石油焦占干基固体颗粒质量分数α（α>10.0%）正相关；（2）添加占干基固体颗粒质量β的煤油表面修饰配煤混合颗粒可以增强颗粒疏水性，进一步提高煤焦浆浓度，黏度随β先减小后增大，β最佳值与α（α>10.0%）负相关；（3）添加微量石油焦（α<1.0%）煤油悬浮液修饰时，可以提高煤油修饰效果，降低煤焦浆黏度η，α最佳值与β正相关。

关键词: 褐煤, 石油焦, 配煤, 煤油表面修饰, 成浆性

CLC Number:

TQ 546

ZHOU Ye, XIAO Huixia, WANG Yifei, YU Guangsuo. Study on improving slurryability of lignite based on coal blending and surface modification[J]. CIESC Journal, 2021, 72(4): 2233-2240.

周烨, 肖慧霞, 王亦飞, 于广锁. 基于配煤和表面修饰改善褐煤成浆性的研究[J]. 化工学报, 2021, 72(4): 2233-2240.

Figures/Tables 13

Table 1 Industrial analysis and elemental analysis of samples

样品	工业分析/%				元素分析/%
样品	M_ad	A_ad	V_ad	FC_ad	C_ad	H_ad	O_ad	N_ad	S_ad
W	5.60	6.58	40.60	47.22	65.50	3.97	16.98	0.48	0.89
Z	0.27	0.51	9.47	89.75	97.40	3.06	0.10	0.88	4.32

Fig.1 Fixed viscosity concentration and contact angle of SW-Z under different α

Table 2 The viscosity and contact angle of kerosene in different modification mode when concentration is 62.0%,α=25.0%

混合方式	η/(mPa·s)	θ/(°)
A	641.93	75
B	851.87	69
C	995.84	46
S_W-Z	1100.27	44

Fig. 2 The viscosity varies with β at the highest slurry concentration corresponding to different α

Table 3 Change of contact angle between K modified W and Z at β=0.5%

固体颗粒	θ/(°)
W+K	65
W	37
Z+K	80
Z	78
W+Z+K(α=25.0%)	70

Fig.3 The highest slurry concentration of SW-Z-K at α = 25.0%, β = 0.5%

Fig.4 Rheological curves before and after kerosene modified coal blending particles

Fig.5 The viscosity of E SW-Z-K and F SW-Z-K change with α at β = 0.5%

Table 4 Change of contact angle at β=0.5%

固体颗粒	接触角/(°)
S_W-K	66
E	72
F	67
S_W-Z-K（α=0.00045%粗）	68
S_W-Z-K (α=0.00045%细）	70

Fig.6 The viscosity of SW-Z-K varies with α under different β

Fig.7 Rheological curves before and after kerosene suspension of petroleum coke modified coal particles

Fig.8 FTIR spectra of coal samples

Fig.9 Viscosity reduction and stabilization mechanism

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