CAJ | 학술논문

通过数值模拟研究了在一维燃烧炉上燃用低挥发分煤的条件下,空气深度分级和煤粉细度变化对煤粉燃尽过程和NO_x排放的影响,得到了沿炉膛轴线方向上的温度、氧浓度和NO_x的分布,表明空气深度分级后燃烧后期的氧量增加,炉膛温度水平提高,而煤粉细度的提高使得上述效果更加明显,因而燃烧效率提高和NO_x排放降低,并通过实际燃烧试验验证了数值模拟结果.研究结果表明,对燃用低挥发分煤,采用空气深度分级技术和提高煤粉细度的措施,可以同时取得高效低NO_x排放的效果.
통과수치모의연구료재일유연소로상연용저휘발분매적조건하,공기심도분급화매분세도변화대매분연진과정화NO_x배방적영향,득도료연로당축선방향상적온도、양농도화NO_x적분포,표명공기심도분급후연소후기적양량증가,로당온도수평제고,이매분세도적제고사득상술효과경가명현,인이연소효솔제고화NO_x배방강저,병통과실제연소시험험증료수치모의결과.연구결과표명,대연용저휘발분매,채용공기심도분급기술화제고매분세도적조시,가이동시취득고효저NO_x배방적효과.
Through a numerical simulation,studied was the influence of the deep air-staged version and change of pulverized coal fineness on the pulverized coal burn-out process and the NO_x emissions under the condition of burning low-volatile coals in an one-dimensional combustion furnace.The distribution of temperature,oxygen concentration and NO_x along the furnace axial direction was obtained.The simulation results show that with the deep air-staged version,the oxygen amount will increase at a later stage of combustion,and the furnace temperature level will go up.Moreover,the enhancement of the pulverized coal fineness will make the above effect more conspicuous,thus improving combustion efficiency and reducing NO_x emissions.The numerical simulation results have been verified by actual combustion tests.It has been found that when burning low-volatile coals,the adoption of such measures as the deep air-staged technology and the increase of pulverized coal fineness can result in both efficiency enhancement and reduction of NO_x emissions.