建立锅炉全系统数学模型，对不同结构、不同负荷、不同容量的锅炉进行一系列内爆模拟。结果表明：由于烟道阻力的增大，加装选择性催化还原(selective catalytic reduction，SCR)脱硝装置后内爆负压增大，增加值接近SCR装置的阻力。由于引风机压头和炉膛内燃烧情况的影响，内爆强度也随着锅炉负荷、锅炉容量的增大而增大。基于一系列的模拟结果，得出炉膛内爆的主要成因是炉膛内燃烧的变化，引风机误操作带来的负面效果是内爆的另一诱因。模拟和分析结果有一定的理论研究价值和实践指导意义。

Numerical investigation was taken on a mathematical model of the whole boiler system. Implosions under different situations, such as different constructions, loads and volume, were simulated. Results show that implosion pressure is lower in the boiler with selective catalytic reduction (SCR) reactor. This is because of the rising of flue gas resistance and induced draft (ID) fan head. The changed value approximates the resistance of SCR reactor. Also, because of ID fan head and furnace combustion, implosion strength increases with boiler load and volume. From the simulation results, it is concluded that changing of furnace combustion is the main cause of implosion, and ID fan head during mal-operation is also an important one. The numerical and analytical results are valuable for both application and theoretical study.