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燃气蒸汽联合循环机组SSS离合器啮合相位角控制技术

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发电设备 2022年第3期36卷 214-218页

作者：杨光刘洋姚正林闫文辰西安热工研究院有限公司西安710032 华能江阴燃气轮机热电有限责任公司江苏无锡214400

针对带有同步自脱(SSS)离合器单轴布置的燃气蒸汽联合循环机组,其SSS离合器处轴振偏大的问题,利用SSS离合器啮合相位角控制装置,分别选取了0°、60°、180°、280°作为啮合相位角,记录SSS离合器在瞬间啮合和整个带负荷过程中轴振的变... 详细信息

针对带有同步自脱(SSS)离合器单轴布置的燃气蒸汽联合循环机组,其SSS离合器处轴振偏大的问题,利用SSS离合器啮合相位角控制装置,分别选取了0°、60°、180°、280°作为啮合相位角,记录SSS离合器在瞬间啮合和整个带负荷过程中轴振的变化数据。结果表明:180°作为啮合相位角时,SSS离合器处轴振小,可作为其最佳啮合相位角。

关键词：燃气蒸汽联合循环机组 SSS离合器啮合相位角振动

Selective catalytic reduction of NO by C_2H_2 over Ce-Al_2O_3 catalyst with rate-determining step of NO oxidation

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Journal of Natural Gas Chemistry 2012年第3期21卷 332-338页

作者： Suhua yan Xinping Wang wenchen Wang Zequn Liu Jiahao Niu State Key Laboratory of Fine Chemicals Dalian University of TechnologyDalian 116024LiaoningChina

Ce-A12O3 catalysts prepared by co-precipitation are investigated both in NO oxidation by 02 and in selective catalytic reduction of NO by C2H2 （C2H2-SCR）. It is found that C2H2-SCR is initiated and controlled by NO oxidation to NO2 over A12O3. Ce loading on A12O3 is almost inactive for NO oxidation below 350℃, since NO2 strongly adsorbs on cerium oxide, leading to the active sites being blocked, which was characterized by temperature-programmed desorption of NO and NO2 and Fourier transform infrared spectroscopy after NO＋O2 coadsorption over the samples. However, in the case of C2H2-SCR, Ce loading on A1203 significantly improves the reaction by accelerating the NO oxidation step in the temperature range of 250-450℃, since the nitrate species produced by NO2 adsorption is an active intermediate required by C2H2-SCR.

关键词： NOx removal NO oxidation nitrate species Ce-A1203 acetylene

变流器在抽汽背压式给水泵汽轮机系统中的应用研究

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热力发电 2022年第4期51卷 179-187页

作者：蔺奕存普建国高景辉吕海涛张明理闫文辰杨博邵亚飞张一帆西安热工研究院有限公司陕西西安710054 华能秦煤瑞金发电有限责任公司江西赣州341000 西安益通热工技术服务有限责任公司陕西西安710032

在抽汽背压式汽轮机(back pressure extraction steam turbine,BEST)构成的双机回热系统中增设电机变流器组,可使BEST启动更具有灵活性。对该系统的运行及控制方式进行了介绍,并在机组试运过程中,在不同运行工况下进行了一系列系统的试... 详细信息

在抽汽背压式汽轮机(back pressure extraction steam turbine,BEST)构成的双机回热系统中增设电机变流器组,可使BEST启动更具有灵活性。对该系统的运行及控制方式进行了介绍,并在机组试运过程中,在不同运行工况下进行了一系列系统的试验。结果表明:变流器对BEST转速的控制精准度较高,且变流器电动工况与发电工况可平稳切换;此外,事故工况下,变流器与小汽轮机电液控制系统(micro electro-hydraulic control system,MEH)之间的控制切换具有迅速、扰动小的特点,保障了机组运行的稳定安全。以上试验验证了变流器在BEST驱动给水泵系统中应用的实际可控性、安全性和稳定可靠性。最后,通过经济性计算,投入变流器后机组在热耗率验收工况下满负荷运行时可节约标准煤约2.1 g/(kW·h),具有一定的经济效益。

关键词：抽汽背压式汽轮机变流器火电机组飞车启动

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Research on the Characteristics of Hot Deformation in BT20 Titanium alloy and Its Optimum Spinning Temperature Range

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Journal of Materials Science & Technology 2005年第6期21卷 807-812页

作者： wenchen XU+, Debin SHAN, yan LU and Chunfeng LISchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China School of Materials Science and Engineering Harbin Institute of Technology

Hot compression tests were conducted on a Gleeble-1500 simulator to investigate the hot deformation behavior of BT20 Ti alloy （Ti-6Al-2Zr-IMo-1V） in the temperature range from 550 to 1000℃ at constant strain rate in the range of 0.01-1s^-1, and then the optimum spinning temperature range was determined. Moreover, tube spinning experiments were executed to verify the reasonability of the optimum temperature range. The results show that the flow stress declines gradually with increasing deformation temperature and decreasing strain rate. In α＋β phase region the dynamic recrystallization is the main softening mechanism and in β phase region the hot deformation softening is controlled by dynamic recovery. In α＋β phase region with reducing strain rate dynamic recrystallization is fully developed. The optimum temperature of hot spinning is 850-900℃ and that of warm spinning is 600-650℃. Meanwhile, at the temperature above 600℃ tubular workpieces of BT20 Ti alloy have been spun without surface cracks and microstructure inhomogeneity, which proves that the optimum spinning temperature range obtained through hot compression experiments is reasonable.

关键词： Dynamic recrystallization Dynamic recovery Phase transformation Optimumtemperature Tubular spinning BT20 titanium alloy

Transcriptome Analysis Identifies SenZfp536,a Sense LncRNA that Suppresses Self-renewal of Cortical Neural Progenitors

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Neuroscience Bulletin 2021年第2期37卷 183-200页

作者： Kuan Tian Andi Wang Junbao Wang Wei Li wenchen Shen Yamu Li Zhiyuan Luo Ying Liu yan Zhou College of Life Sciences Renmin Hospital of Wuhan UniversityWuhan UniversityWuhan430072China Frontier Science Center for Immunology and Metabolism Medical Research InstituteSchool of MedicineWuhan UniversityWuhan430071China Institute of Basic Medical Sciences Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing100730China

Long non-coding RNAs(lncRNAs)regulate transcription to control development and homeostasis in a variety of tissues and ***,their roles in the development of the cerebral cortex have not been well ***,a bioinformatics pipeline was applied to delineate the dynamic expression and potential cis-regulating effects of mouse lncRNAs using transcriptome data from 8 embryonic time points and sub-regions of the developing cerebral *** further characterized a sense lncRNA,SenZfp536,which is transcribed downstream of and partially overlaps with the protein-coding gene *** SenZfp536 and Zfp536 were predominantly expressed in the proliferative zone of the developing ***536 was cis-regulated by SenZfp536,which facilitates looping between the promoter of Zfp536 and the genomic region that transcribes ***,knocking down or activating the expression of SenZfp536 increased or compromised the proliferation of cortical neural progenitor cells(NPCs),***,overexpressing Zfp536 in cortical NPCs reversed the enhanced proliferation of cortical NPCs caused by SenZfp536 *** study deepens our understanding of how lncRNAs regulate the propagation of cortical NPCs through cis-regulatory mechanisms.

关键词： Zfp536 Sense lncRNA Self-renewal Cortical development Neural progenitor

NUMB enhances Notch signaling by repressing ubiquitination of NOTCH1 intracellular domain

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Journal of Molecular Cell Biology 2020年第5期12卷 345-358页

作者： Zhiyuan Luo Lili Mu Yue Zheng wenchen Shen Jiali Li Lichao Xu Bo Zhong Ying Liu yan Zhou College of Life Sciences Renmin Hospital of Wuhan UniversityMedical Research Institute at School of MedicineWuhan UniversityWuhan 430072China

The release and nuclear translocation of the intracellular domain of Notch receptor(NICD)is the prerequisite for Notch signaling-mediated transcriptional *** is subjected to various posttranslational modifications including ***,we surprisingly found that NUMB proteins stabilize the intracellular domain of NOTCH1 receptor(N1ICD)by regulating the ubiquitin–proteasome machinery,which is independent of NUMB’s role in modulating ***1,a deubiquitinating enzyme(DUB),was further identified as a positive N1ICD regulator,and NUMB facilitates the association between N1ICD and BAP1 to stabilize ***,BAP1 stabilizes N1ICD independent of its DUB activity but relying on the BRCA1-inhibiting ***1 strengthens Notch signaling and maintains stem-like properties of cortical neural progenitor ***,NUMB enhances Notch signaling by regulating the ubiquitinating activity of the BAP1–BRCA1 complex.

关键词： NUMB Notch intracellular domain BAP1 ubiquitination neural progenitor cells

抽汽背压式汽轮机回热系统投运方式对其运行影响的研究

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发电设备 2022年第6期36卷 377-381,386页

作者：蔺奕存伍刚张明理高景辉闫文辰付志龙吕吉明邓顺怀西安热工研究院有限公司西安710054 华能秦煤瑞金发电有限责任公司江西赣州341000

详细介绍2种方式下投运抽汽背压式汽轮机(BEST)回热系统的过程,并且分析投运方式对主要参数的影响。结果表明:采用加热器随机投运方式会导致BEST背压偏低,电机组功率超限;采用先投运低压加热器(简称低加)后投运高压加热器(简称高加)方式... 详细信息

详细介绍2种方式下投运抽汽背压式汽轮机(BEST)回热系统的过程,并且分析投运方式对主要参数的影响。结果表明:采用加热器随机投运方式会导致BEST背压偏低,电机组功率超限;采用先投运低压加热器(简称低加)后投运高压加热器(简称高加)方式,需要较长的时间,但有利于BEST建立背压,避免了BEST背压过低导致电机组功率超限,该方法可以降低机组煤耗,提高机组经济性。

关键词： BEST 回热系统加热器背压

Long non-coding RNA LncKdm2b regulates cortical neuronal differentiation by cis-activating Kdm2b

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Protein & Cell 2020年第3期11卷 161-186页

作者： Wei Li wenchen Shen Bo Zhang Kuan Tian Yamu Li Lili Mu Zhiyuan Luo Xiaoling Zhong Xudong Wu Ying Liu yan Zhou College of Life Sciences Renmin Hospital of Wuhan UniversityMedical Research Institute at School of MedicineWuhan UniversityWuhan 430072China Department of Cell Biology Tianjin Medical UniversityQixiangtai Road 22Tianjin 300070China

The mechanisms underlying spatial and temporal control of cortical neurogenesis of the brain are largely *** non-coding RNAs(lncRNAs)have emerged as essential cell fate *** we found LncKdm2b(also known as Kancr),a lncRNA divergently transcribed from a bidirectional promoter of Kdm2b,is transiently expressed during early differentiation of cortical projection ***,Kdm2b’s transcription is positively regulated in cis by LncKdm2b,which has intrinsic-activating function and facilitates a permissive chromatin environment at the Kdm2b’s promoter by associating with *** tracing experiments and phenotypic analyses indicated LncKdm2b and Kdm2b are crucial in proper differentiation and migration of cortical projection *** observations unveiled a lncRNA-dependent machinery in regulating cortical neuronal differentiation.

关键词： long non-coding RNA neuronal differentiation cerebral cortex KDM2B divergent lncRNA

Hot spinning of cylindrical workpieces of TA15 titanium alloy

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Rare Metals 2007年第S1期26卷 255-261页

作者： XU wenchen,SHAN Debin,yanG Guoping,CHEN Yu,LU yan,and KANG Dachang School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China Harbin Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R China

In order to form large-diameter thin-wall cylindrical workpieces of TA15 titanium alloy,tube hot spinning experiments of the alloy were conducted on a CNC hot spinning *** causes of some forming defects occuring in hot spinning,such as crack,pileup,bulge and corrugation,were analyzed and the corresponding measures were put forward to avoid spinning defects,based on which a proper process scheme of hot spinning of TA15 alloy was obtained and the large-diameter and thin-walled cylindrical workpieces were formed with good *** results show that spinning temperature has distinct influence on forming quality of spun *** range of spinning temperature determines the spinnability of titanium alloy and the ununiformity of temperature distribution near the deformation zone leads to the formation of *** reasonable heating method is that the deforming region is heated to the optimum temperature range of 600-700 ℃,the deformed region is heated continuously and a certain length of undeformed region is *** the thickness-to-diameter ratio(t/D) of spun workpiece reducing to certain value(t/D<1%),surface bulge and corrugation is rather easier to come into being,which could be controlled through restraining diameter growth and employing smaller reduction rate and lower temperature in the optimum spinning temperature range.

关键词： TA15 titanium alloy hot spinning cylindrical workpiece forming defect thickness-to-diameter ratio