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针对国内大部分中小型工业炉窑采用传统直燃煤工艺引发的能源和环境等问题,自行开发设计了煤高温气化与高温贫氧燃烧一体化系统。介绍了该系统的工艺路线和热工特性,应用实验研究和数学模拟相结合的方法,研究了一体化系统的煤气化及燃烧特性。研究结果表明:提高空气气化剂温度,可降低空煤比,提高煤气热值、气化效率和气化强度;当空气气化剂温度从常温提高到1050℃时,煤气热值将提高33%,空煤比减小43%,气化强度提高近一倍;提高助燃空气温度,将使燃气加热炉内的火焰容积扩大,炉温分布趋于均匀,热效率显著增加,NOx生成浓度大幅度降低。该系统与常温煤气化炉和换热式轧钢加热炉系统相比,系统热效率将提高一倍以上,单位产品能耗降低50%。
In view of the problems of energy and environment caused by the traditional direct coal combustion technology in most domestic small and medium-sized industrial furnaces, the integrated system of high-temperature coal gasification and high-temperature oxygen-depletion combustion was developed and designed by ourselves. The process route and thermal characteristics of the system are introduced. The combination of experimental and mathematical simulation is applied to study the gasification and combustion characteristics of the integrated system. The results show that increasing the temperature of air gasifier can reduce the air-to-air ratio and increase the calorific value, gasification efficiency and gasification strength. When the temperature of air gasifier increases from room temperature to 1050 ℃, the heat value of gas will increase by 33% , The air-coal ratio is reduced by 43% and the gasification intensity is nearly doubled. Increasing the temperature of the combustion-supporting air will enlarge the volume of the flame in the gas heating furnace, the temperature distribution will be uniform, the thermal efficiency will be significantly increased and the NOx generation concentration will be greatly reduced . Compared with the room temperature coal gasification furnace and the heat transfer rolling furnace heating system, the thermal efficiency of the system will more than double and the energy consumption per unit product will be reduced by 50%.