MPS型磨煤机制粉系统动态模型与瞬态运行优化控制研究  

Study on Dynamic Model and Transient Operation Optimization Control of the MPS Coal Mill Pulverizing System

作　　者：王朝阳[1] 石慧[2] 王文毓 许朋江[2] 范建林 刘明[1] 严俊杰[1] WANG Chaoyang;SHI Hui;WANG Wenyu;XU Pengjiang;FAN Jianlin;LIU Ming;YAN Junjie(State Key Laboratory of Multiphase Flow in Power Engineering(Xi’an Jiaotong University),Xi’an 710049,Shaanxi Province,China;Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,Shaanxi Province,China;Shaanxi Xinyuan Clean Energy Co.,Ltd.,Yulin 719404,Shaanxi Province,China)

机构地区：[1]动力工程多相流国家重点实验室(西安交通大学),陕西省西安市710049 [2]西安热工研究院有限公司,陕西省西安市710054 [3]陕西新元洁能有限公司,陕西省榆林市719404

出　　处：《中国电机工程学报》2024年第16期6518-6528,I0019,共12页PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING

基　　金：国家自然科学基金项目(52106026);陕西省科学技术协会青年人才托举计划项目(20220469);陕西省自然科学基础研究计划项目(2021JLM-34)。

摘　　要：为提升MPS型磨煤机制粉系统变出力过程关键参数的控制精度,该文建立并验证制粉系统动态模型,开展控制策略优化研究。在原逻辑基础上,提出考虑煤质水分信息的前馈磨煤机入口一次风温控制回路,以优化控制策略。开展煤质水分增加、给煤速率增加、磨煤机变出力等瞬态过程模拟研究,获得制粉系统关键参数瞬态特征和能耗特性,验证所提出策略的优越性。结果表明:采用优化的控制逻辑后,系统在应对煤质水分突变、煤量突变等扰动时的响应速率增加、磨煤机出口风粉温度波动范围减小50%以上、瞬态能耗下降2.4%。磨煤机在变出力过程中,稳态能耗可降低100 kW以上,制粉过程能耗降低6.82%,瞬态过程中磨煤机出口风温的波动幅度下降50%、响应时间缩短10%以上、可实现瞬态节能5.43%,保障制粉系统的运行安全并降低能耗。在燃煤发电机组中应用提出的制粉系统优化控制逻辑,可降低燃煤发电机组变负荷瞬态过程中负荷率、主汽压力等关键参数的运行偏差,提高机组的运行灵活性。To improve the control accuracy of the critical parameters of the MPS coal pulverization system during the loading cycling process,this paper establishes and verifies the dynamic model of the pulverization system and conducts control strategy optimization research.On the basis of the original logic of the pulverizing system,it is proposed to add the primary air temperature control loop at the inlet of the feedforward pulverizer for considering the coal moisture information to improve the control strategy.Simulation research such as the increase of coal moisture,the increase of coal feeding rate,and the load cycling of the pulverizer is carried out.The transient characteristics of key parameters and energy consumption of the pulverizing system are obtained,verifying the proposed strategy's superiority.Research results show that:Once the control logic of the pulverizing system proposed is adopted,the response rate of the system is improved when confronted with disturbances like sudden variations in the feed coal flow rate or abrupt increases in the moisture content of the coal.What’s more,the fluctuation range of the pulverized coal temperature decreases by more than 50%,and the transient energy consumption decreases by 2.4%.During the load cycling transient process of the pulverizer,the steady-state energy consumption can be reduced by more than 100 kW,and the energy consumption in the pulverizing process can be reduced by 6.82%.During the transient process,the fluctuation range of the pulverizer outlet temperature can be reduced by 50%,the response time can be shortened by more than 10%,and the maximum transient energy saving can be achieved by 5.43%,which comprehensively guarantees the operation safety of the pulverizing system and reduces the energy consumption.When the optimization control logic of the pulverizing system proposed is applied in a coal-fired power plant,the operation deviations of key parameters,such as load rate and main steam pressure,can be reduced during the load cycling transient process.

关 键 词：MPS型磨煤机 制粉系统 动态模型 变出力 瞬态能耗 控制优化 

分 类 号：TM621[电气工程—电力系统及自动化]