注汽锅炉在线吹灰装置内可燃气体爆炸过程模拟分析

摘要

The explosion study of combustible gas in the injection boiler soot blower is extremely important for the safe operation of the field.Establish the FLUENT model of RNG k-ε turbulence and PDF combustion.Solve the equations of ex-plosion flow and reaction in the method of finite volume.Simulating and analyzing combustible gas explosion under different conditions ignition position and energy in two-dimensional soot blower to get the combustible gas explosion temperature field,velocity field and pressure field.Simulation results showed that:the larger ignition energy,the more violent explo-sions carried out,the greater the peak of velocity and pressure of flame propagation.The difference between the bottom and center ignition is only in the initial intensity of the reaction,the soot blower output pressure to reach final 5-6 standard at-mospheric pressure with temperature of about 2 600 ℃.Under the pressure wave and high temperature,the boiler fouling can be carbonized,shattered and falling.The conclusions of oilfield design and optimization of steam injection line pulsating soot blower provide a theoretical basis and safe operation.%注汽锅炉脉动在线吹灰装置内可燃气体的爆炸研究对油田的安全运行极为重要。建立了基于 FLUENT 软件的总能量 RNG k-ε湍流模型与 PDF 燃烧模型,以有限体积法求解爆炸流动及反应控制方程,对二维吹灰装置中不同能量、不同点火位置条件下的可燃气体爆炸过程进行数值模拟分析,获得了可燃气体爆炸温度场、速度场及压力场。模拟结果表明,点火能量越大,爆炸进行的越剧烈,压力峰值与速度峰值就越大；中心点火与底端点火只是初始时反应剧烈程度不同,吹灰装置最终输出压力能达到5~6个标准大气压,温度约为2600℃,在压力波与高温作用下能够将锅炉内积灰碳化、震碎和掉落。所得结论为油田设计注汽锅炉在线脉动吹灰装置及安全运行提供了理论依据。