低热值煤层气燃烧器的数值模拟

A Numerical Simulation of a Low-heat-value Coal-bed Gas Burner

对一种低热值煤层气燃烧器进行了全尺寸的三维燃烧数值模拟研究,预测了燃烧器出口的流场、温度和组分分布情况,并考察了不同热负荷和不同喷口形式对燃烧器性能的影响。结果表明该燃烧器具有较宽的负荷调节能力,渐缩喷口燃烧器燃烧温度最高且射流刚性好,50%～100%热负荷内渐扩喷口燃烧器燃烧性能最佳,25%热负荷下渐缩喷口燃烧器燃烧性能最佳。模拟结果对该燃烧器的进一步优化设计有一定的指导意义。

A numerical simulation study of a full-scale three-dimensional combustion has been conducted of a low-heat-value coal-bed gas burner along with a forecast of flow fields, temperature and constituent distribution at the outlet of the burner. Investigated also was the impact of different thermal loads and nozzle patterns on the burner performance. The results of the study show that the burner has the ability to regulate a relatively wide range of loads with the converging nozzle burner having the highest combustion temperature and a good rigidity of jet flow. The diverging nozzle burner has the optimal combustion characteristics during the thermal loads ranging from 50% to 100% and the converging nozzle burner has the optimal combustion performance at 25% thermal load. The simulation results may serve as a helpful guide for furthering the optimized design of the burner.