【摘要】 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%。更多还原

【Abstract】 To address the energy source and environment protection problems of the majority of medium and small-sized industrial furnaces or kilns in China due to the use of traditional direct coal-combustion technology,the authors have independently designed and developed an integrated system of coal high-temperature gasification and high-temperature oxygen-deficient combustion along with a description of the process chart and thermodynamic characteristics of the system.By a combination of experimental study and mathematical simulation,studied was the coal gasification and combustion characteristics of the integrated system.The research results show that by raising the temperature of the air gasification agent it is possible to reduce the air-coal ratio and enhance the coal-gas heat value,gasification efficiency and intensity.When the air gasification agent temperature is increased from the normal temperature to 1 050 ℃,the coal gas heat value will be increased by 33%,the air-coal ratio reduced by 43%,and the gasification intensity almost doubled.To raise the temperature of the combustion-supporting air can enlarge the flame volume of combustion gas in the heating furnace and the furnace temperature distribution tends to be uniform,leading to a significant increase in thermal efficiency and a dramatic reduction in NOx generation concentration.The thermal efficiency of the above system will be more than doubled as compared with that of a normal-temperature coal-gasification furnace and a heat-exchange type of steel-rolling heating furnace system.Moreover,its unit product energy consumption will be reduced by 50%.更多还原