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在等离子体点火煤粉燃烧试验台上,通过向等离子体燃烧器内喷水引起水煤气生成反应来再造挥发分,以提高煤粉气流的点火特性.通过试验得到了喷水量对再造挥发分的影响规律,并在本次试验工况下得到了点火和再造挥发分的最佳喷水量.结果表明:随着喷水量的增加,反应室出口的CO浓度、反应室内的温度和出口火焰温度均先上升,后下降;反应室没有喷水时,测得反应室喷口处的CO浓度为1332.3 mg/m3;当反应室喷水量为20 mL/min时,测得反应室喷口处的CO浓度为2977.2 mg/m3;向反应室喷水后,反应室喷口处的CO浓度可以提高1倍以上.通过水煤气生成反应再造挥发分,方法简便,适用性强,效果明显,对今后低挥发分煤的点火具有重要的借鉴意义.
In the plasma ignition pulverized coal combustion test bench, the volatiles were regenerated by generating water gas into the plasma burner to improve the ignition characteristics of the pulverized coal flow. And the optimal rule of ignition and rebuilding volatilization was obtained under the experimental conditions.The results showed that with the increase of water injection, the CO concentration in the outlet of the reaction chamber, the temperature in the reaction chamber and the outlet flame The temperature of the reaction chamber first increased and then decreased; when the reaction chamber did not spray water, the CO concentration at the reaction chamber outlet was measured to be 1332.3 mg / m3; when the reaction chamber water injection amount was 20 mL / min, CO concentration of 2977.2 mg / m3; after the water jet to the reaction chamber, the concentration of CO in the reaction chamber can be more than doubled.Removal of volatiles through water gas generation reaction is simple and convenient, applicability is strong, the effect of the future low volatility Ignition of sub-coal has important reference significance.