【摘要】 针对前置暖风器烟气余热回收系统，建立了多参数设计优化与变工况特性计算模型，开展了系统的多参数优化，并提出了运行参数控制策略。结果表明：多参数优化后系统在设计工况下的节煤率为3.67 g/(kW·h);多参数优化后的系统在变工况下虽能保持较高的节煤率，但系统的安全性受到环境温度和负荷的严重制约；采用所提出的控制策略可使系统在100%额定负荷下，安全运行的环境温度下限从24℃扩展至-3℃,显著提高了系统优化的综合效果。更多还原

【Abstract】 The calculation model of the multi-parameter design optimization and variable working conditions was developed for the waste heat recovery system of the pre-heater of coal-fired unit. The multi-parameter optimization for the system was performed. The control strategy of operating parameters was proposed. Results show that the coal-saving rate of the optimized system under the design condition is 3.67 g/(kW·h). Although the multi-parameter optimized system can maintain a high coal-saving rate under off-design working conditions, the safety is seriously restricted by the ambient temperature and unit load. The proposed control strategy can extend the lower limit of environmental temperature for safe operation of the system from 24 ℃ to-3 ℃ at 100% rated load, which significantly improves the comprehensive effect of system optimization.更多还原