配煤对煤灰熔融性及黏温特性的影响

宁东地区煤种灰熔融温度和灰黏度均较低,是影响宁东煤化工基地大型气流床气化技术长周期稳定运行的关键因素,用X射线衍射分析(XRD)、Factsage软件、灰熔融温度测定仪和高温黏度测定仪探讨煤灰高温灰化过程中的矿物演变,研究配煤对宁东煤矿区配煤灰熔融特性及黏温特性的影响规律。结果表明,配煤比例与灰熔融特性、灰黏温特性均呈非线性关系。石槽村样煤(SM)与麦垛山煤样(MK)质量比为2∶8时,配煤的灰熔融温度为1 300℃,灰黏度5 Pa·s,基本满足德士古气化炉用煤的煤质要求,该配煤比例下高温灰的矿物组成主要是石英。可见通过配煤可以有效改善煤灰熔融及黏温特性。

Effect of coal blending on ash-fusion and viscosity-temperature characteristics

The extremely low fusion temperature and low viscosity of coal ash were the critical factors influencing on the long-period stable operation of large-scale entrained-flow gasifiers in Ningdong coal chemical industries,therefore the effect of coal blending on ash-fusion and viscosity-temperature characteristics were systematically investigated by XRD,Factsage,ash-melting tester and high temperature rotary viscometer,respectively.Results show that the coal blending ratio is nonlinear with ash-fusion and viscosity-temperature characteristics.The blending of SM coal and MK coal with a ratio of 2 ∶ 8 achieving the ash-fusion temperature of 1 300 ℃ and viscosity 5 Pa · s basically satisfies the operational requirements of Texaco gasifier.The main mineral with high melting point in the blended coal ash is quartz.It can be concluded that the blending of coals can effectively improve the ash-fusion and viscosity-temperature characteristics.