干煤粉气化炉原料煤掺配高硫石油焦气化适应性研究

针对目前高硫石油焦利用率低的问题,选取两种典型高硫石油焦（JL、US）分别与AQ006煤掺配,考查了掺配两种焦的可磨性、灰熔融特性、黏温特性、CO2反应性,并进行了气化模拟计算。结果表明：两种石油焦具有低灰、低挥发分、高硫、高发热量等特点,且两种焦在不同掺配比例下,配煤的可磨性指数均高于80,是优质的粉煤气化配煤原料。AQ006煤分别掺配两种焦的灰熔融温度均高于1500℃,添加石灰石可有效降低掺配质量分数25%JL焦和US焦（焦∶煤=1∶3）的配煤灰熔融温度至1 400℃以下,且在石灰石质量添加量为6%时,两种掺配焦的高温灰渣黏度在2～25Pa.s的温度区间都高于200℃,满足Shell气化炉操作要求。与单独JL焦、US焦相比,配煤的CO2反应性显著提高。模拟计算结果表明掺配石油焦加助熔剂方案与中国石化安庆分公司Shell气化炉现用配煤方案相比,有效气产量增大,比氧耗和比煤耗有所下降。

STUDY ON GASIFICATION ADAPTABILITY AND SIMULATION COMPUTING OF BLENDING HIGHSULFUR PETROLEUM COKE IN DRY PULVERIZED COAL GASIFIER

The ash fusion temperature,viscosity-temperature characteristics and CO2 reactivity of two high sulfur petroleum coke samples,JL petroleum coke and US petroleum coke,blending with AQ006 coal respectively were studied for shell coal gasification process.The results show that JL and US petroleum coke with the properties of low ash,low volatile,high-sulfur,high calorific value and higher grindability index are good candidate as gasification feedstocks.The addition of limestone flux can effectively decrease the ash flow temperatures of JL petroleum coke and US petroleum coke blending with AQ006 coal to less than 1 400 ℃.The ash viscosity temperature curves of two selected blending samples(coke∶coal=1∶3)with 6% limestone show that the temperature region from 25 Pa·s to 2 Pa·s is higher than 200 ℃.As temperature lower than 1 400 ℃,the values of viscosity increase sharply with the temperature decreasing.The reactivity of JL petroleum coke and US petroleum coke blending AQ006 coal with carbon dioxide is higher than that of JL,US petroleum coke.The gasification simulation results show that JL petroleum coke and US petroleum coke blending AQ006 coal(1∶3)with the addition of 6% limestone flux is better than the feedstock running in Anqing Shell coal gasification.