褐煤水煤浆提浓制备工艺研究

Research on Concentrated Preparation Technics of Coal-Water Slurry from Lignite

针对采用内蒙古某矿褐煤制浆存在浓度低(<49.0%),无法满足水煤浆气化炉正常开车需求的现状,通过对制浆温度、添加剂及粒度级配的优化研究,确立了褐煤提浓制浆工艺条件,并应用Aspen Plus软件模拟提浓前后水煤浆气化指标。研究结果表明:采用优化的粒度级配方案,选用质量分数0.5%改性萘系添加剂复配0.4%降黏助剂,在50℃下制浆,褐煤水煤浆最高浓度可达54.1%,相比优化前制浆浓度提高5.6%;提浓后水煤浆的合成气产量、冷煤气效率模拟指标分别为78.07%和70.25%,显著优于现场煤浆相应指标。

Aiming at the status of low concentration ( less than 49.0%) of coal-water slurry from Inner Mongolia lignite which made it difficult for the gasifier to run normally.In this paper,primary process parameters of concentrated lignite preparation were obtained on the bases of investigations into the influences of temperature,species and amounts of additives,and coal size-distribution on concentration of lignite.Besides,Aspen Plus was applied to simulate the gasification of lignite with various concentrations.The results showed that in the presence of compound additive of 0.5% mixed with 0.4% viscosity additive,a lignite with concentration of 54.1%,which increased by 5.6% at 50 ℃ compared with existing lignite with optimized coal size-distribution.Moreover,the data from gasification simulation demonstrated that the syngas production and cold gas efficiency of the concentrated lignite were 78.07% and 70.25% respectively,which were remarkably superior to that of existing lignite.