煤沥青水浆的制备及影响规律的研究

Preparation and influence factors of coal pitch water slurry

以中温煤沥青为原料,经冷冻粉碎后制得具有一定粒径级配的煤沥青粉,加入适量分散剂和水在高速搅拌下制备煤沥青水浆。结果表明,JL-C01中裂乳化剂是制备煤沥青水浆的优良分散剂,在此基础上进一步考察了分散剂用量及浆体浓度对煤沥青成浆性、煤沥青水浆流变性及稳定性的影响。结果表明,最大成浆浓度为70%;在分散剂用量相同的条件下,煤沥青水浆的表观黏度随浆体浓度的增大呈先减小后增大趋势;不同浓度煤沥青水浆的表观黏度均随剪切速率的增加而呈下降趋势;同一剪切速率下,表观黏度随煤沥青水浆浓度的增大而增加,煤沥青水浆属于假塑性流体,当煤沥青水浆浓度为69%时其流变性最佳。分散剂用量相同时,煤沥青水浆的稳定性随浆体浓度的增大呈下降趋势,浆体浓度达到70%时,稳定天数可达21d。参照水煤浆标准GB/T18856-2002,对煤沥青水浆进行了分析,所测项目中低位发热量达水煤浆Ⅰ级标准、灰分达水煤浆Ⅰ级标准、硫分达水煤浆Ⅱ级标准、挥发分达水煤浆Ⅰ级标准。

The medium temperature coal tar pitch was used as the raw material to prepare coal tar pitch powder with certain particle size distribution by freezing and then pulverizing.By adding proper amount of dispersant and water,the coal tar pitch powder was made into the coal pitch water slurry（CPWS） at high agitating speed.The screening experiments show that the JL-C01 emulsifier has the best dispersion effect.The effect of the dispersant dosage and slurry concentration on the slurry-ability,rheological behavior and static stability of CPWS were investigated.The maximum slurry-ability concentration is 70%.The apparent viscosity of CPWS firstly decreases and then increases with increasing shearing rate when the dispersant dosage is same.For different slurry concentrations,the apparent viscosity of CPWS presents a decreasing tendency with increasing shearing rate.Under the same shearing rate,the apparent viscosity goes up as the slurry concentration increases.The CPWS is a pseudo-plastic fluid.The best rheological behavior is obtained when the slurry concentration is 69%.When the slurry concentration is 70%,the slurry maintains stable for 21d.Referring to coal water slurry criterion GB/T18856-2002,the combustion analysis of CPWS was made.The low heat value,ash,and the volatile matter all meet the first grade standard for coal water slurry.In addition,the sulfur content achieves the second grade standard.