【摘要】 为解决生物质层燃锅炉运行中存在热效率低和NO_x排放量高的问题，对哈尔滨某锅炉厂DZL 1-0.7-S燃生物质锅炉进行结构改造。基于Fluent软件，在均匀配风、相同物料及相同料层高度的条件下，对结构改造前后的燃生物质锅炉进行仿真模拟，对炉膛内温度场、速度场和气体体积分数进行对比分析。模拟结果表明，改造后的燃生物质锅炉炉膛内平均温度由925 K升高至989 K,升高了64 K。炉膛出口截面处NO_x的质量浓度由179.21 mg/m~3减少至148.39 mg/m~3,降低了约17%。将模型计算与实际测试结果进行对比，NO_x的质量浓度相对误差为6.9%,热效率由82%提升至87%。该结构适合于现有生物质层燃锅炉改进，可实现锅炉高效、清洁燃烧的目的。更多还原

【Abstract】 To address the issues of low thermal efficiency and high NO_x emissions during the operation of biomass grate-fired boilers, structural transformation was performed on the DZL 1-0.7-S biomass-fired boiler from a boiler factory in Harbin. Based on Fluent software, simulations were conducted on the biomass-fired boiler before and after structural transformation under the conditions of uniform air distribution, same fuel, and same fuel bed height, with comparative analyses of the temperature field, velocity field, and gas volume fraction in the furnace. The simulation results show that the average temperature in the furnace of the optimized biomass-fired boiler increased from 925 K to 989 K, a rise of 64 K. The NO_x concentration at the furnace outlet section decreased from 179.21 mg/m~3 to 148.39 mg/m~3, a reduction of approximately 17%. By comparing the model calculation results with actual test results, the relative error of NO_x concentration was 6.9%, and the thermal efficiency increased from 82% to 87%. The structure is suitable for the improvement of existing biomass grate-fired boilers and can achieve the goal of efficient and clean combustion of the boiler.更多还原