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设计了一种煤粉高温富氧无油点火装置,利用高温氧气与高浓度煤粉气流的混合直接点燃煤粉,进而取代油枪,实现煤粉的无油点火。通过冷态流场测定实验对点火装置进行了结构优化,并以此为基础,对煤粉高温富氧无油点火进行了数值模拟。结果表明:煤粉高温富氧无油点火装置采用三角形导流锥,中心管喷口扩口半角取15°,高温氧气通道喷口扩口半角取25°时组织的流场状况较好;点火装置形成的富氧燃烧高温火炬温度最高可在3 000 K上,烟气平均温度可在2 000 K以上,能有效保证主燃烧器的顺利点火。
A high-temperature oxygen-rich and oil-free ignition device for pulverized coal was designed. The mixture of high-temperature oxygen and high-concentration pulverized coal was used to directly ignite the pulverized coal, thereby replacing the oil gun to achieve oil-free pulverized coal ignition. Based on this, the structural optimization of the ignition device was carried out through the cold flow field measurement experiment, and the numerical simulation of high temperature oxygen-rich oil-free ignition of pulverized coal was carried out. The results show that the flow field of the pulverized coal high temperature oxygen-enriched oil-free ignition device is triangular and the flow field is good when the high-temperature oxygen channel outlet is half-angle of 25 °; The maximum temperature of oxyfuel combustion torch is 3000 K, the average temperature of flue gas is above 2000 K, which can effectively ensure the main burner to ignite successfully.