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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。
The whole system mathematical model of the boiler is established, and a series of implosion simulations are carried out for boilers with different structures, different loads and different capacities. The results show that the negative pressure of implosion increases with the installation of selective catalytic reduction (SCR) denitrification device due to the increase of flue resistance, and the added value approaches the resistance of SCR device. Due to the influence of the induced draft head and the combustion in the furnace, the implosion intensity also increases with the increase of boiler load and boiler capacity. Based on a series of simulation results, it is concluded that the main cause of the hearth internal explosion is the change of combustion in the hearth. The negative effect of the induced draft fan misoperation is another inducement of implosion. Simulation and analysis of the results of a certain theoretical value and practical significance.