【摘要】 秸秆振动炉排炉的振动模式对炉内的多相燃烧过程及污染物排放有全面影响，为提升锅炉效率、降低蒸汽单耗，该文提出基于多热厚颗粒（multiple thermally thick particle,MTTP）层燃模型数值模拟的振动模式优化方法。首先，针对典型的130 t/h振动炉排炉构建模型，模拟复现常见的出生料、燃尽差问题；进而利用模拟，厘清层燃基本反应过程，揭示不同阶段振动参数的影响机制，并分析振动过程中CO、NO_x和SO₂的演变；最后，提出振动优化策略，实炉验证对燃烧效率和污染物排放的优化效果。结果表明，在底部着火层燃方式中，燃料停留时间显著影响前端着火准备区长度，但火焰传播区长度不变。满足着火需求前提下，采用短间隔、高频率、快爬坡、短持续的振动，有助于破焦与燃尽，缓解集中热解与燃烧的不利影响。经实炉优化，锅炉产汽效率显著提升，NO_x和SO₂排放大幅降低。基于精细化数值模拟的优化方法能为秸秆直燃发电供热的效益提升提供新思路。更多还原

【Abstract】 Vibration mode of straw vibrating grate boilers has a comprehensive effect on the solid-phase combustion in the fuel bed and the homogeneous combustion in the freeboard, as well as on pollutant emissions. To improve boiler efficiency and reduce fuel consumption, this paper proposes optimization of vibration mode by means of the numerical simulation based on the developed multiple thermally thick particle（MTTP） grate combustion model. First, a model is built for the typical 130 t/h vibrating grate boiler, and issues like insufficient combustion of straw are reproduced by numerical simulation. Further, through numerical simulation, the basic reaction processes of layer combustion are clarified, the effects of vibration parameters in different combustion stages are revealed, and evolutions of CO, NO_x and SO₂ are analyzed in a grate vibration cycle. Finally, the optimization strategy in vibration mode is proposed and applied in an actual furnace, to evaluate the improvements in combustion efficiency and pollutant control. The results indicate that, in a bottom-ignited layer combustion mode, the residence time of fuel on the grate significantly influences the length of the ignition preparation zone at the front end, while the length of the flame propagation zone remains unchanged. With the time requirement for the ignition of fuel bed fulfilled, the application of a vibration mode with short intervals, high frequency, rapid ramp-up, and short duration contributes to coke block breaking and fuel burnout, and mitigates the adverse effects associated with concentrated pyrolysis and combustion. After applying the adjustment in vibration in an actual boiler, its steam production efficiency has been significantly improved, with substantial reductions in NO_x and SO₂ emissions. Optimization based on numerical simulation provides a new way to increase the profits of power generation and heat supply from straw combustion.更多还原