The carbon sorbent traps method was used to monitor the mercury content and speciation underhigh-temperature and high-ash content conditions that are beyond the allowable conditions of the EPAMethod 30B,to extend its ...The carbon sorbent traps method was used to monitor the mercury content and speciation underhigh-temperature and high-ash content conditions that are beyond the allowable conditions of the EPAMethod 30B,to extend its application range.The results show that,when measuring the total mercury con-centration in flue gas,this method can be applied to the occasions of high dust concentration(e.g.beforethe WFGD system),with the error caused by dust lower than 1%,if keeping the flow rate at a lower leveland employing dustproof cover.But this method is not suitable to the conditions with extreme high dustcontent.By applying air-cooled casing and controlling the sampling gun's insert depth,the temperature ofcarbon traps can be kept within a suitable range.Thus,the measurement accuracy of mercury concentrationbefore air preheater can be ensured.For the chimney inlet and other areas with low dust concentration,theproportion of Hg°measured by the 30B method is in accordance with the Hg-CEMS after the WFGD sys-tem,while after the CFB-FGD system,the proportion of Hg°measured by the 30B method is slightly lowerthan that by the Hg-CEMS method.For locations with high dust concentration,the proportion of Hg°measured by the 30B method may be much lower than the true value.展开更多
为了弥补交流变速抽蓄机组涉网环节的不足,依据我国对大型发电机组并网的技术要求,提出了一种适用于交流变速抽蓄机组的单通道电力系统稳定器(power system stabilizer, PSS)设计方法,同时还给出了变速机组与定速机组的协同响应策略。...为了弥补交流变速抽蓄机组涉网环节的不足,依据我国对大型发电机组并网的技术要求,提出了一种适用于交流变速抽蓄机组的单通道电力系统稳定器(power system stabilizer, PSS)设计方法,同时还给出了变速机组与定速机组的协同响应策略。在励磁系统特性方面,对比分析了变速机组与定速机组的差异,改进了PSS的传递函数结构,提出了相关参数的估算方法,能够适应交流变速抽蓄机组的并网要求。在厂内协调方面,针对变速机组与定速机组的协同控制需求,研究了基于变模态分解技术的协同响应方案,并对比了抽蓄电厂的整体反应效果,能够用于指导首台变速机组投产的工程实际。为了进行仿真分析,搭建了IEEE 9节点系统,并利用真实风电场数据,构建了电网功率扰动场景,验证了所提方法的有效性。展开更多
基金The Science and Technology Project in China Huaneng Group:“Mercury Control Technology R&D Laboratory Construction”
文摘The carbon sorbent traps method was used to monitor the mercury content and speciation underhigh-temperature and high-ash content conditions that are beyond the allowable conditions of the EPAMethod 30B,to extend its application range.The results show that,when measuring the total mercury con-centration in flue gas,this method can be applied to the occasions of high dust concentration(e.g.beforethe WFGD system),with the error caused by dust lower than 1%,if keeping the flow rate at a lower leveland employing dustproof cover.But this method is not suitable to the conditions with extreme high dustcontent.By applying air-cooled casing and controlling the sampling gun's insert depth,the temperature ofcarbon traps can be kept within a suitable range.Thus,the measurement accuracy of mercury concentrationbefore air preheater can be ensured.For the chimney inlet and other areas with low dust concentration,theproportion of Hg°measured by the 30B method is in accordance with the Hg-CEMS after the WFGD sys-tem,while after the CFB-FGD system,the proportion of Hg°measured by the 30B method is slightly lowerthan that by the Hg-CEMS method.For locations with high dust concentration,the proportion of Hg°measured by the 30B method may be much lower than the true value.
文摘为了弥补交流变速抽蓄机组涉网环节的不足,依据我国对大型发电机组并网的技术要求,提出了一种适用于交流变速抽蓄机组的单通道电力系统稳定器(power system stabilizer, PSS)设计方法,同时还给出了变速机组与定速机组的协同响应策略。在励磁系统特性方面,对比分析了变速机组与定速机组的差异,改进了PSS的传递函数结构,提出了相关参数的估算方法,能够适应交流变速抽蓄机组的并网要求。在厂内协调方面,针对变速机组与定速机组的协同控制需求,研究了基于变模态分解技术的协同响应方案,并对比了抽蓄电厂的整体反应效果,能够用于指导首台变速机组投产的工程实际。为了进行仿真分析,搭建了IEEE 9节点系统,并利用真实风电场数据,构建了电网功率扰动场景,验证了所提方法的有效性。
