煤焦油燃烧特性数值模拟

Numerical simulation of combustion characteristics of coal tar

利用数值模拟方法,选用标准k-ε湍流模型,化学反应采用涡-耗散模型,辐射模型应用P-1辐射模型,研究进油口尺寸、进气口尺寸一定,煤焦油蒸气速度和助燃气体速度不变,富氧条件下不同含氧助燃气体对燃烧室火焰空间温度场和气流场压力场的影响。结果表明,助燃气体含氧量越高,火焰温度越高,燃烧速率越快,尾气排放所带走热量越小,火焰空间温度场分布梯度变大。数值模拟结果对于煤焦油用于工业燃烧条件的设计和操作具有一定的理论指导和实践意义。

Numerical simulation of combustion was performed with standardκ-ε turbulent model, eddy-dissipation com- bustion model and P-1 radiation model. The influences of oxygen concentration of the combustion-supporting gas on definite velocity and temperature were investigated in oxygen-full. The simulating results showed that under the condi- tion which sport size and the velocity of coal tar were invariable, the greater the oxygen concentration was, the greater the temperature value of combustion was, the better the combust rate of fuel and air was. The quality of exhaust gas and the quantity of effluent heat became smaller. The results will be very helpful to improve the design of condition about coal tar combustion and conducts of operation in industry.