低阶煤热解提质多联产技术的研究

Poly-generation technology of low-rank coal pyrolysis

阐述了新疆哈密地区低阶煤具有高水分、高挥发分、低灰、低硫等特点。通过煤炭热解、半焦成浆、半焦活化、半焦燃烧和焦油馏分试验,对热解提质与其他工艺优化组合的多联产应用的技术和经济可行性进行论证。结果表明:热解半焦具有低硫和灰熔融性较高的特性,完全符合喷吹煤标准;半焦可替代混合煤制浆,成浆浓度可达62.00%以上,黏度适中,流动性、析水情况均较好;半焦活化后对高浓度焦化废水污染物具有很好的吸附效果,挥发酚脱除率达99.65%,处理后废水含酚2.23 mg/L;半焦在减少细粒物排放,降低锅炉积灰方面具有明显优势;焦油馏出温度<360℃的馏分体积分数为48.96%,且酚油体积分数达15.68%。最后对热解提质多联产技术的经济性进行分析,采用LCC技术干燥热解处理低阶煤利润可达52264万元/a。

The low-rank coal in Xinjiang Hami is a quality coal with low moisture, ash and sulphur, high volatile. Demonstrate the feasibility of poly-generation technology which is combining pyrolysis upgrading technology with other technologies through coal pyrolysis, semi-coke slurrying, activation and combustion, tar distillation experiments. The results show that, semi-coke has the characteristics of low sulfur and high ash fusibility, which can meet the standards of injection coal. Semi-coke can replace the mixed coal to produce coal water slurry, whose concentration is more than 62 percent, its viscosity, mobility, water repelleney are good. After activation, the semi-coke has great adsorption to high concentration coking wastewater, the removal rate of volatile phenol is 99.65 percent, the phenol in wastewater is 2. 23 mg/L after treatment. Semi-coke has obvious superiority in reducing emissions of particulate matter and boiler fouling. The volume percent of tar, whose distillation temperature is below 360 ℃, is 48.96 percent,and the volume percent of phenol oil is 15.68 percent. Analyse the economic benefits of this poly- generation technology. The profits is up to 5. 2264x10s yuan per year by treating low-rank coal using LCC technology.