单系列辅机低负荷运行协调控制及优化
发布时间：2018-09-11 20:55
【摘要】：某配置单系列辅机的超临界燃煤发电机组投运后长期处于50%及以下负荷运行,而其存在的低负荷工况下控制精度低的特性难以满足机组协调控制要求,导致机组存在过热度、给水和主蒸汽压力波动大、引风机出力扰动大、一次调频负荷响应慢、机组经济性和安全性无法保证的问题。对此,本文提出改变磨煤机入口风量测量装置,完善炉膛负压控制和低负荷时降低一次风流量占比,变参数动态适配给水和过热度控制策略,增加一次调频阀位响应指令快动慢回,并对锅炉主控制器和低负荷前馈回路进行改造。优化改造后的低负荷170~200 MW(48%~57%)扰动试验结果表明,优化后的协调控制策略能满足机组升降负荷和稳态运行的需求。该控制策略对单系列辅机低负荷安全运行、电网深度调峰控制具有一定借鉴作用。
[Abstract]:The supercritical coal-fired generator set equipped with a single series of auxiliary machines has been running at 50% or less load for a long time after being put into operation. However, the characteristics of low control precision under low load condition are difficult to meet the requirements of coordinated control of the unit, resulting in the existence of superheat degree of the unit. The pressure fluctuation of feed water and main steam, the disturbance of induced fan's output force, the slow response of primary frequency modulation load, and the unguaranteed economy and safety of the unit. In this paper, it is put forward to change the measuring device of inlet air volume of coal mill, perfect the negative pressure control of furnace and reduce the primary air flow ratio at low load, and change the parameters to dynamically match the control strategy of feed water and superheat degree. The position response order of the primary frequency modulation valve is added and the boiler main controller and low load feedforward loop are reformed. The disturbance test results of 170 ~ 200 MW (48 ~ 57%) show that the optimized coordinated control strategy can meet the requirements of load lifting and steady operation. The control strategy can be used for reference for low load safe operation of single series auxiliary machines and deep peak-shaving control of power network.
【作者单位】： 西安热工研究院有限公司;华能洛阳发电有限责任公司;
【分类号】：TM621
，
本文编号：2237817
[Abstract]:The supercritical coal-fired generator set equipped with a single series of auxiliary machines has been running at 50% or less load for a long time after being put into operation. However, the characteristics of low control precision under low load condition are difficult to meet the requirements of coordinated control of the unit, resulting in the existence of superheat degree of the unit. The pressure fluctuation of feed water and main steam, the disturbance of induced fan's output force, the slow response of primary frequency modulation load, and the unguaranteed economy and safety of the unit. In this paper, it is put forward to change the measuring device of inlet air volume of coal mill, perfect the negative pressure control of furnace and reduce the primary air flow ratio at low load, and change the parameters to dynamically match the control strategy of feed water and superheat degree. The position response order of the primary frequency modulation valve is added and the boiler main controller and low load feedforward loop are reformed. The disturbance test results of 170 ~ 200 MW (48 ~ 57%) show that the optimized coordinated control strategy can meet the requirements of load lifting and steady operation. The control strategy can be used for reference for low load safe operation of single series auxiliary machines and deep peak-shaving control of power network.
【作者单位】： 西安热工研究院有限公司;华能洛阳发电有限责任公司;
【分类号】：TM621
，
本文编号：2237817
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