壳牌煤气化磨煤单元存在的问题及改造方案

SHELL煤气化技术在中国已有很多成功案例,但使用褐煤作为原料,大唐多伦煤化工尚属首例。本文主旨探讨褐煤经过干燥后使用中速辊式磨煤机研磨时需要注意的问题,其中包括磨煤机震动、给煤机以及碎煤仓底部堵煤、跨煤的问题的解决方案,为以后褐煤在SHELL煤气化的应用做好铺垫。     

云南弥渡地区更新世成煤作用分析

对云南弥渡地区平安庄和彭家庄褐煤矿的煤质参数和成煤环境进行了综合分析,并对研究区内3个不同方向的更新世松毛坡组的综合柱状图进行了对比,同时结合平安庄盆地沉积环境特征,由此得出云南弥渡地区更新世褐煤沉积作用的4个地质作用阶段。     

褐煤的用途及其加工利用方向分析

文章分析了新疆艾丁湖褐煤的煤质特性，阐述了艾丁湖褐煤用作动力发电燃料、选气原料、气化原料的优缺点，艾丁湖褐煤褐煤利用前景展望。     

A novel lignite pre-drying system with low-grade heat integration for modern lignite power plants

The lignite pre-drying process plays an important role in modern lignite power plants and the fluidized bed dryer with internal heat utilization is a promising drying method which has both high efficiency and cost-effectiveness. After conducting an in-depth analysis of a typical lignite pre-drying power plant, this work proposed a novel lignite pre-drying system with low-grade heat integration. Through system integration, the low-temperature evaporation of the lignite was recovered to heat the combustion air, while the residual heat from the flue gases was used to heat the feed or condensed water, thereby saving a portion of heat from the steam bleeds of the high and intermediate pressure turbines. The results for a 1,000 MW lignite-fired power plant showed that, the proposed pre-drying system could yield an increase in net plant efficiency of approximately 3.6 % points and a reduction in the cost of electricity of $1.83/（MW h）. The thermodynamic and economic performances were each superior to those of the existing pre-drying system, convincingly demonstrating that the research of this paper may provide a promising integrated lignite pre-drying method for the next-generation of lignite-fired power plants.     

SPNH(改进型)抗高温降失水稳定剂的实验研究

着重介绍了一种新型抗高温降滤失稳定剂SPNH(改进型)及其室内实验情况。结果表明,SPNH(改进型)具有降失水、降粘作用,抗温能力强,抗盐性好,热稳定性好,成本低,其效果明显优于同类磺化系列处理剂。     

褐煤转化制取稠油降粘剂的研究

褐煤降解产物的组成分布和结构与稠油相似,可以利用褐煤转化来制取稠油降粘添加剂.其最佳转化条件:温度为155℃,压力为784.3 KPa,反应时间为2h,煤水比为300g/L.实验室考察结果表明,添加剂量为0.06％时,可使胜利单家寺稠油和大港羊三木稠油的粘度由原来的9600和4100mPa.s分别降至200和100 mPa.s.现场试验结果表明,降粘剂浓度为0.2％～0.35％(对活性水)时,可使管路压力降减少40％～60％,且稳定性良好.降粘剂(GY-1)还可适用于不同胶质、沥青质及不同含水量的稠油降粘,并易于脱水.     

东北某露天矿褐煤干燥提质对水分复吸的影响

东北某露天矿褐煤因水分含量高,使用前需要进行干燥提质处理,以提高其燃烧热效率.为研究褐煤干燥提质后对水分复吸的影响,利用傅里叶变换红外光谱仪(Fourier transform infrared spectrometer,FTIR)、差热/热重分析仪(differential analysis/thermogravimetric analyzer,DTA/TG)、扫描电子显微镜(scanning electron microscope,SEM)等先进分析手段,结合干燥提质工艺,研究褐煤干燥提质对水分复吸的作用.结果 表明:东北某露天矿褐煤所含主要官能团包括:羟基、亚甲基、甲基、羰基、羧基和醚键.干燥提质后褐煤含水率由44.78％降至25.07％.干燥提质后褐煤静置9d后的含水率为25.75％,水分含量随时间增长无明显变化,水分吸附逐渐达到动态平衡.由于褐煤结构中的孔洞和裂隙减少,含氧官能团分解,干燥提质后褐煤对水分子的吸附能减弱,因此水分复吸不明显.干燥提质可以有效的抑制褐煤对水分子的吸附.     

黄县褐煤净化含铬废水的研究

本文主要是研究黄县褐煤净化含铬废水的条件、机理和效果。发现pH<3时,褐煤净化Cr(Ⅵ)的效果较好;pH>4时.净化Cr(Ⅲ)的效果较好。pH值较低时,褐煤对Cr(Ⅵ)的净化有吸附和还原作用。净化方法简易可行。