58 MW旋流煤粉锅炉炉内温度场模拟

Simulation of temperature field of a 58 MW swirling pulverized coal-fired boiler

研究燃煤锅炉炉内温度场,对于合理改变锅炉运行工况从而提高锅炉效率具有重要意义。本文以某58 MW机组旋流煤粉锅炉为研究对象,根据锅炉的真实尺寸建立物理模型,通过现场试验数据验证了计算数据的可靠性;依据计算流体力学原理,利用合适的边界条件与合理的假设,对6种工况下锅炉炉内燃烧温度场进行数值求解,分析炉膛内的温度分布。结果表明,该型煤粉锅炉在80%负荷,内外二次风风量配比4:1的条件下运行状况最为理想。所得结果对燃煤工业锅炉在能效提高方面具有重要的参考价值。

Studying the temperature field in the furnace of a coal-fired boiler is of great significance to reasonably change the operating conditions of the boiler and improve the efficiency of the boiler. In this study, a58 MW swirling pulverized coal-fired boiler is taken as the research object. A physical model is established according to the actual size of the boiler, the reliability of the calculated data is verified by field test data. Based on the principle of computational fluid mechanics, the numerical solution of combustion temperature field in boiler furnace under 6 kinds of working conditions is carried out using appropriate boundary conditions and reasonable assumptions. And the temperature distribution of the furnace is analyzed. The result shows that, this type of pulverized coal-fired boiler operates optimally under the condition that the load rate is 80% and the ratio of internal and external secondary air volume is 4:1. The obtained results have important reference value for improving the energy efficiency of coal-fired industrial boilers.