晋城无烟煤灰熔融温度的助熔调控方法研究

Study on control methods of ash melting temperature of Jincheng anthracite

研究晋城无烟煤用于液态排渣气化工艺时灰熔融温度的适应性及其助熔调控方法,可为其液态排渣气化技术的现场应用提供基础支撑。选取晋城10个矿区的无烟煤,探究煤灰化学组成及酸碱比等参数对晋城无烟煤灰熔融温度的影响,采用添加碱性助熔剂或掺配高碱性氧化物含量煤的方式研究晋城无烟煤的助熔调控方法。结果显示:晋城无烟煤灰熔融温度高的原因在于灰组分中酸性氧化物含量高(80%~90%)、碱性氧化物含量低(9%~18%)、酸碱比高(4.6~7.6);煤灰熔融流动温度均在1500℃以上,需添加石灰石类的碱性助熔剂或掺配高钙煤以用于晋城无烟煤的液态排渣气化技术。添加石灰石和配煤的实验显示:在晋城无烟煤中添加2%~4%的石灰石或掺配40%的神木煤即可将流动温度降低至1400℃以下,从而满足液态排渣气化技术对晋城无烟煤灰熔融温度的要求。

The study on the adaptability of ash melting temperature of Jincheng anthracite used in liquid-state slag removal gasification process and its control method can provide basic support for its field application.Anthracite coals from 10 mining areas in Jincheng were selected to study the effects of ash chemical composition and acid-base ratio on ash melting temperature,the fusing control method of Jincheng anthracite ash was studied by adding basic flux or blending with high basic oxide coal.The results show that the high melting temperature of Jincheng anthracite ash is due to its high acidic oxide content(80%~90%),low basic oxide content(9%~18%)and high acid-base ratio(4.6~7.6).The melting and flowing temperatures of Jincheng anthracite ash are above 1500℃,therefore,when Jincheng anthracite is used in liquid-state slag removal gasification technology,it is necessary to add calcareous alkali flux or mix high calcium coal.Experiments with limestone and coal blending show that the flow temperature of Jincheng anthracite can be reduced to below 1400℃by adding 2%~4%limestone or 40%Shenmu coal,so it can meet the requirement of coal ash melting temperature of liquid-state slag removal gasification technology.