基于配煤和表面修饰改善褐煤成浆性的研究

doi:10.11949/0438-1157.20201242

摘要/Abstract

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

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

中图分类号:

TQ 546

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.

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.

图/表 13

表1 样品工业分析和元素分析

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

图1 不同α时SW-Z最高成浆浓度和接触角变化

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

表2 浓度为62.0%，α=25.0%时K不同改性方式的黏度和接触角

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

图2 不同α对应的煤焦浆最高成浆浓度下黏度随β变化

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

表3 β=0.5%的K修饰W和Z的接触角变化

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

图3 α=25.0%、β=0.5%时SW-Z-K最高成浆浓度

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

图4 煤油修饰配煤颗粒前后的流变曲线

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

图5 β=0.5%时E和F黏度随α的变化

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

表4 β=0.5%时不同石油焦改性方式的接触角变化

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

图6 浓度为60.0%，不同β时SW-Z-K黏度随α的变化

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

图7 石油焦煤油悬浮液修饰煤颗粒前后的流变曲线

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

图8 煤样的红外光谱图1,2— —OH；3—芳烃—C—H；4，5—甲基和亚甲基—CH3、—CH2—；6—芳香CC或氢键化的羰基；7—无机碳酸盐或—CH2、CH3；8—C—O；9,10—取代芳烃CH、灰分

Fig.8 FTIR spectra of coal samples

图9 降黏稳定机制

Fig.9 Viscosity reduction and stabilization mechanism

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