水煤浆水冷壁气化炉升温过程中纯氧燃烧特性的研究

Research on the Pure Oxygen Combustion of Heating Process in the Water-cooled Wall Gasifier of Water Slurry

针对助燃剂分别为空气和纯氧两种燃烧工况,采用CFD软件,对某水煤浆水冷壁气化炉的升温过程进行了数值研究,模拟结果与工程实际定性相符,验证了该计算模型的有效性。研究结果表明,纯氧燃烧能满足气化炉升温过程中对温度控制的要求,与过量空气系数为1.3的空气燃烧相比,采用纯氧燃烧,节约燃料40.76%,炉内平均温度比空气燃烧高398 K。在维持温度场均匀的前提下,为延长烧嘴的使用寿命,通过进一步的计算分析,提出了水煤浆水冷壁气化炉升温过程中的工艺优化方案。

The paper focuses on the air and pure oxygen combustion of heating process in the water-cooled wall gasifier of water slurry, which is investigated by CFD simulation. The simulation results are in line with engineering practice, which shows the simulation model and numerical method are effective. From the result, pure oxygen combustion can meet the requirement of gasifier heating process for temperature control. Compared with air combustion of 1.3 excess air coefficient, the fuel consumption can be saved up to 40.76% for pure oxygen combustion, and the furnace average temperature is up 398 K. On the premise of uniform temperature distribution, in order to prolong the service life of burner nozzle, the optimal process scheme is proposed about the heating process in water-cooled wall gasifier of water slurry through further calculation and analysis.