Engineering Technology Research Center of Energy Conservation and Environmental Protection for Power Plant of Henan Province,Zhengzhou ElectricPower College
College of Mechanical and Electrical Engineering
ZhengzhouYingze Environmental Protection & Energy Company Limited
Department of Energy andPower Engineering,Tsinghua University

随着城市生活垃圾产量不断提升,在垃圾分类和技术进步的驱动下,垃圾焚烧发电作为一种兼具环境效益和社会效益的发电方式已成为清洁能源发电的重要发展方向。目前,机械炉排焚烧炉因其高效性和稳定性,在垃圾焚烧发电厂中的占比已超过90%。然而,在生活垃圾掺烧渗滤液污泥对焚烧炉运行的影响方面,国内外尚缺乏深入的研究。通过数值模拟,研究掺烧城市生活垃圾和渗滤液污泥条件下炉排焚烧炉内的燃烧状态对实现焚烧炉的高效稳定运行具有重要意义。以郑州某700t/d逆推式垃圾焚烧炉为对象,利用FLIC软件和FLUENT软件分别对炉排床层燃料燃烧和燃烧室气相燃烧过程进行模拟,得到炉内温度场、速度场和气体组分浓度场。通过与现场运行数据对比,模拟结果与实测结果最大误差不超过10%,验证了模拟的准确性,并在此基础上对炉排移动速度和污泥质量分数进行了优化,以获得更好的空气动力场和温度场。研究发现,降低炉排移动速度可以改善燃烧状态,提高燃烧效率,而适量的污泥掺烧可以降低炉内局部高温,减轻后墙二次风喷口处由于烟温过高而造成的结焦。然而过量的污泥掺烧会导致干燥段延长,使燃烧室高温区域向后墙靠近,反而不利于焚烧炉的稳定运行。因此,建议炉排移动速度控制在3.56m/h,污泥质量分数在2%~4%。

With the continuous increase in urban domestic waste, waste incineration power generation, driven by waste classification andtechnological progress, has become an important development direction for clean energy power generation due to its environmental andsocial benefits. Currently, mechanical grate incinerators account for more than 90% of waste-to-energy plants due to their high efficiencyand stability. However, there is a lack of research on the impact of co-firing municipal solid waste (MSW) with leachate sludge onincinerator operations both domestically and internationally. Numerical simulations can play a significant role in studying the combustionstate in a moving grate incinerator. In this study, taking a 700 t/d reverse-moving grate incinerator as the object, FLIC software andFLUENT software were employed respectively to simulate grate-firing on the moving grate and gas-phase combustion in the combustionchamber. By the numerical simulations, the temperature field and velocity field were obtained, as well as the concentration distributions ofdifferent gas components within the incinerator. The simulation results were compared with the actual operating data, and the maximum error did not exceed 10%, verifying the accuracy of the simulation. Based on this, the moving speed of the grate and the mass fraction ofleachate sludge were optimized to improve the aerodynamic field and temperature field in the incinerator. Simulation results showed thatreducing the moving speed of mechanical grate could improve the combustion state and combustion efficiency. The appropriate massfraction of leachate sludge could reduce the local high temperature in the combustion chamber and reduce the slagging level caused by thehigh flue gas temperature near the secondary air nozzle of the rear wall. However, excessive mass fraction of leachate sludge would lead tothe extension of the drying section, which made the high temperature zone closer to the rear wall, which is not conducive to the stableoperation of the incinerator. Therefore, it is recommended to control the moving speed of mechanical grate at 3.56 m/h and maintain massfraction of leachate sludge between 2% and 4%.

河南省高等学校重点科研资助项目(23B480005);河南省科技攻关资助项目(242102240093);河南省教育厅重点科研资助项目(24B480015)

彭丹,高天宇,姜华伟,等.炉排焚烧炉生活垃圾掺烧渗滤液污泥的数值模拟[J].洁净煤技术,2025,31(1):51−60.

PENG Dan,GAO Tianyu,JIANG Huawei,et al. Numerical simulations of co-firing municipal solid waste with leachatesludge in a moving grate incinerator[J].Clean Coal Technology,2025,31(1):51−60.