间断级配工艺制备气化水煤浆试验研究

Experimental study on preparation of gasification coal water slurry by gap-graded process

为提高褐煤成浆浓度,以褐煤和精煤为原料,采用间断级配制浆工艺,分别对2个单种煤样和配煤进行成浆性试验,研究不同混煤方法对制浆浓度、黏度、流动性的影响,并确定最佳混配制浆方案。结果表明,褐煤具有高水分、高挥发分、低热值、反应活性好、制浆浓度低的特点;精煤具有低水分、高热值、反应活性差、制浆浓度高等特点。褐煤、精煤单种煤的最高成浆浓度分别为51.89%、73.75%。褐煤与精煤以质量比6∶4均匀混配,粗细粉配比为7∶3,添加剂用量为0.3%(干基/干粉)条件下,制取的水煤浆最高浓度为61.24%,表观黏度为1 298 mPa·s,流动性目测为B级,浆体流动摊开面积为192 cm^2时,且浆体流动性、稳定性都较好,满足水煤浆气化设计要求。

In order to improve the concentration of lignite water slurry,lignite and clean coal were used to investigate the effects of different coal blending methods on the concentration,viscosity and fluidity of lignite water slurry,and then obtained the optimal scheme.The results show that lignite features high moisture,high volatile,high reactivity,and lower calorific value and coal water slurry concentration,while the clean coal has the characteristics of low moisture,high calorific value,poor reactivity,and high coal water slurry concentration.The highest coal water slurry concentration of lignite and clean coal are 51.89% and 73.75%,respectively.When the mass ratio and thickness ratio of lignite and clean coal are 6 ∶ 4 and 7 ∶ 3,and the dosage of additive is 0.3%,the highest coal water slurry concentration is up to 61.24%with apparent viscosity of 1 298 m Pa·s,the fluidity of B and the slurry flow spread area of 192 cm-2. Further,the fluidity and stability of prepared coal water slurry show good state,which meets the design requirements.