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Causes analysis and treatment of end shield oil leak in 500kV main transformer bushing YU Wentao，HUANG Wenfeng，MA Xin Huadian Technology    2018, 40 (2): 25-28.   Abstract （517）      PDF （1485KB）（2902）       Knowledge map    Save A 500kV main transformer of a power plant found oil leak defect at its bushing end shield of the high voltage side during overhaul. Through analysis, it was confirmed that the reason for oil leak was ungrounded end shield. It introduced the replacement of high voltage bushing and partial discharge test in details. After replacement, it was found that the end shied ground column was damaged during the dielectric dissipation test of transformer through disassembly check and the grounded copper sleeve was jammed and could not bounce fully. Countermeasure was carried out according to the causes of the defect. Related Articles | Metrics

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Experimental study on the effect of biological enzyme treatment on coal storage calorific value and coal pile temperature LIU Zhongxuan，NING Xinyu，CHENG Shi Huadian Technology    2019, 41 (3): 40-42.   Abstract （659）      PDF （832KB）（2339）       Knowledge map    Save The coal storage of the power plant coal yards is huge, and the storage period is long. Reducing the loss of calorific value and spontaneous combustion of coal during storage period can improve the economic efficiency of power plants. Through spraying  biological enzymes on the coal pile of a coal yard, the data of effect of biological enzymes treatment on largescale coal pile calorific value and temperature is obtained.The results show that the biological enzyme treatment technology has a certain effect on reducing the loss of calorific value during the coal storage period.The temperature of the treated coal pile during storage period will rise, which is not conducive to reducing the spontaneous combustion of the coal pile. Related Articles | Metrics

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Prevention and Control of Boiler ‘Four Pipe’ Leakage ZHOU Xue-song Huadian Technology    2008, 30 (9): 9-12.   Abstract （4672）            Knowledge map    Save unplanned outage is one of important benchmarking content, and boiler ‘four pipe’ leakage is the main reason caused unplanned outage in thermal power plant at long time, which influences safety and stable operation of generation equipments seriously. In the 670t/h boiler of Tianjin Junliangcheng Power Generation Corporation Limited, the heating surface was arranged unreasonably, heating surface leakage was occurred frequently. Aiming at this problem, a special anti-explosion team was established, the boiler heating surface was supervised and checked during the boiler production, erection and operation. By continuous groping and improvement, a set of effective anti-abrasion, anti-explosion experiences were summarized. The application of these experiences reduces the leakage greatly, and unplanned outage was no occurred in 2006 and 2007. Related Articles | Metrics

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Discussion about the Status of Running at Daytime and Stopping at Night Gas Turbine Generator YU Li-fan;CHENG Liang Huadian Technology    2008, 30 (9): 56-58.   Abstract （4177）            Knowledge map    Save The two familiar main bus connection of gas turbine generator was introduced, the prescription about generator normal status was explained, a burned-out accident of knife switch at the generator outlet and an accidental closing of generator main breaker were described. The actuation of normal generator protection device under the case of main generator beaker accidental closing was analyzed, the status of gas turbine generator, which is running at daytime and stopping at night, was discussed also. Related Articles | Metrics

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The Important Way for Energy Saving of Fan and Pump WANG Zhen-yu Huadian Technology    2008, 30 (7): 1-5.   Abstract （4110）            Knowledge map    Save The correct selection and use of fan and pump are the important prerequisite for raising their efficiency. Taking fan as the example the similar operation relations of fan and pump are explained, the essential conditions which must be satisfied for similarity of fan and pump were proposed, and the inevitable results of the similarity were given. The variable frequency speed regulation has become the first scheme to be selected. According to the similarity law of fan and pump, in the process of reducing speed, the efficiency of the fan and pump will be kept at the same value, and its flow rate, pressure(or delivery head) and power are reduced in proportion to speed, speed square and speed cube respectively. Related Articles | Metrics

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Thermal power plant waste water zeroemission technology proposal LIU Jin Huadian Technology    2017, 39 (9): 58-62.   Abstract （625）      PDF （881KB）（2048）       Knowledge map    Save To realize thermal power plant waste water zero emission, technology of desulfurization waste water preprocess, desulfurization waste water concentrated treatment and tail strong brine evaporative crystallization was compared. The propitiated proposal was selected. Postprocessed condensate water could be used as industrial water, and realized power plant water treatment system closetype circulating. There is not any water discharged. Waste water zero emission was realized. Related Articles | Metrics

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Status and prospect of virtual power plant technology YANG Xiaosi，TAO Xinlei，HAN Li Huadian Technology    2020, 42 (5): 73-78.   Abstract （756）      PDF （437KB）（1935）       Knowledge map    Save Intensive integration of information technology and energy technology is the development direction of energy industry at home and abroad. Based on modern communication technology and Internet technology，virtual power plants have broken through the geographical limitation through networks.The virtual plant integrates distributed renewable energy generation，energy storage，controllable load and other subsystems into a virtual entity to participate in transactions of the power market.And it provides capacity services and auxiliary services for the power grid，so as to improve the economy and reliability of the power system and facilitate the consumption and efficient utilization of renewable energy as well. The demonstration power plants in developed European countries and China were studied and compared from their key points， the core technologies and the practice effect.Consideration of the current situation and prospect of the energy industry in China，it is concluded that the technical route of European virtual power plants is more suitable for domestic power plants in the future，and reasonable suggestions for the key technologies and development direction of domestic virtual power plants are put forward . Related Articles | Metrics

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Selection of large capacity stepup transformer in power plant JU Zhenghao Huadian Technology    2017, 39 (2): 35-37.   Abstract （309）      PDF （712KB）（1915）       Knowledge map    Save This paper introduced the selection basis of large capacity stepup transformer. The comparison of three phase compacted transformer and three single phase transformers was based on negativesequence current, operation reliability, operation loss, price, transportation and other aspects. To determine the short circuit impedance, unit operation stability and voltage adjusting rate were considered as well as short circuit current. Related Articles | Metrics

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The Reason Analysis on Hydrogen Purity Lowering of Double-ring Oil Sealing Generator HU Xiao-hui Huadian Technology    2008, 30 (7): 14-16.   Abstract （3967）            Knowledge map    Save The quantity of make-up hydrogen is an important operation index of generator unit, too large quantity of hydrogen often appears in the double-ring oil sealing generator .By the analysis of the oil sealing system and the sealing bush construction, the problems and hidden troubles existing in system design and operation were treated and regulated, the speed of hydrogen purity lowering was controlled, the hydrogen exchange quantity of generator and the hydrogen consumption were reduced, so the purpose of energy-saving and consumption-reducing was achieved at last. Related Articles | Metrics

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The First Home-made 670t/h CFB Boiler and Its Operation Experience PENG Xiao-zheng;CHEN Nian-zu;CHENG Wen-feng Huadian Technology    2008, 30 (7): 6-8.   Abstract （4010）            Knowledge map    Save The problems revealed during erection, trial operation and trial production of the first home-made CFB boiler were introduced. The adoption of successful experience, the improvement of fluidized bed heat exchanger (FBHE), the measures for prevention of explosive combustion and furnace clinkering were expounded in detail, and the useful practical experience for construction of 1025t/h CFB boiler and other CFB boilers was afforded. Related Articles | Metrics

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Intelligent power plant integrated big data platform key technology and application analysis ZHANG Fan Huadian Technology    2017, 39 (2): 1-3.   Abstract （534）      PDF （958KB）（1891）       Knowledge map    Save Intelligent power plant construction is the development direction of electric power industry informatization, establish large data integration platform for power plants to produce all kinds of data processing is a key step of constructing power plants with wisdom. Per the characteristics of the electric power industry, analyze the data source and data structures, designed the special data platform architecture to deal with data and calculation of deep mining gives accurate decision support information. The platform in a coalfired power plant actual operation, the operation results show that the platform can handle power plant data and it is concluded that the correct information. Related Articles | Metrics

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The Current Problems and Countermeasures of Energy Saving and Emissions Reducing in Power Industry WANG Zhi-xuan Huadian Technology    2008, 30 (5): 1-6.   Abstract （3799）            Knowledge map    Save In this paper the current status of energy saving and emissions reducing in power industry were introduced, and existing problems were pointed out. The following proposals were put foreword by author: to step up our efforts to promote the adjustment of electric power industrial structure, further strengthen technique transform for the old units, deep the reform of legal system and market, perfect the mechanism of energy saving and emissions reducing, intensify the research on science of energy saving and emissions reducing, give full play to the role of self- discipline. Related Articles | Metrics

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Improvement for Reverse Power Trip of Power Plant Huadian Technology    2008, 30 (5): 39-40.   Abstract （3512）            Knowledge map    Save Related Articles | Metrics

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Water investment and integrated energy coupling utilization and development HAN Mailiang Huadian Technology    2019, 41 (11): 66-69.   Abstract （193）      PDF （900KB）（1861）       Knowledge map    Save At present, environment and energy issues have got worldwide attention.While facing severe energy crisis and environmental pollution, we need to diversify the ways of energy utilization.Concerning the development direction of the whole water investment industry, the current situation of energy consumption in sewage treatment plants was analyzed, and specific countermeasures were put forward, such as fully tapping the renewable energy in sewage treatment plants, recovering and utilizing the heat and biomass of municipal sewage effectivly. Distributed photovoltaic power generation system and water source heat pump were installed.And sludge disposal and burning contributed to heating and electricity supply, which realized the  energy saving,environment protection and effective utilization of integrated energy. Related Articles | Metrics

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The Energy-saving Reformation of Electro-static Precipitator Power Supply ZHU Qi Huadian Technology    2008, 30 (7): 68-70.   Abstract （3657）            Knowledge map    Save Aiming at the shortcoming existing in the electro-static precipitator power supply and its control device of Wangting Power Plant unit #11, which includes the larger energy consumption, the backward control mode, the frequently occurring of communication accident, etc., the reformation measures were proposed. The economic analysis by the comparison of energy consumption before and after reformation shows that the energy-saving goal is realized perfectly. Related Articles | Metrics

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Discussion on Operation Optimization and Improving Economical Benefit for Power Generation Units JING Chang-cai Huadian Technology    2008, 30 (5): 12-14.   Abstract （2620）            Knowledge map    Save Related Articles | Metrics

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Discussion on Direct ACC System of 1000MW Ultra-supercritical Unit ZHANG Xin-hai Huadian Technology    2008, 30 (5): 7-11.   Abstract （3717）            Knowledge map    Save Four schemes of steam discharge into air cooling system were planned according to the different nameplate output definition for 1000MW unit. The process flow of direct air cooling system was described. The heat-transfer area of air cooling condenser (ACC), the number of fans and duct rows, the diameter of discharge ducts and the height of the ACC platform for each scheme were determined by detailed calculation and analysis. The result can be used as reference for the construction of air cooling system in 1000MW unit. Related Articles | Metrics

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The Coal Consumption Data Analysis of Turbine System in Benchmarking Management HUANG Xiang Huadian Technology    2008, 30 (9): 1-5.   Abstract （3742）            Knowledge map    Save Based on the heat balance diagram of 600MW unit, the key data points in rated condition were analyzed, and relevant thermal efficiency data can be obtained by calculating according to the key data points. The coal consumption rate and unit thermal efficiency will vary with the variation of the field operation parameters. Therefore, it is can find that in which respects the unit need adjustment or reformation by analysis of key points data variation, and the key link for decrease the coal consumption rate of power plant can be grabbed. The emphasis of this paper is analysis of coal consumption data of steam turbine thermal power system, the coal consumption rate in this paper was obtained by heat balance calculation according to the relevant data of heat balance diagram. Related Articles | Metrics

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The Research and Measures of Energy-saving and Consumption-reducing in 1000 MW Unit REN Shang-kun;ZHAO Xun-hai;WU Yan-bin;LIN Fu-hai;DONG Wen-cheng Huadian Technology    2008, 30 (9): 6-8.   Abstract （4038）            Knowledge map    Save In the Huadian International Zouxian Power Plant, a benchmarking management long-effective work mechanism of‘Comparing with advanced， checking error and correcting malpractice, continually improving, uninterrupted exceeding’ was established, and adequate attention was paid to the energy-saving and consumption-reducing work. According to the actual operation of two 1000 MW units, the concrete methods and measures for energy saving and consumption reduction were analyzed and introduced. Under the rated condition, the standard net coal consumptions of units No.7 and No.8 are 282.28 g/（kW•h）and 281.91g/（kW•h），heat consumption rates are 7330.94kJ/（kW•h） and 7345.4kJ/（kW•h） respectively. Since the units were brought into production, their house service consumption rates achieve 5.22% and 5.29% respectively, and the design requirement was satisfied. Related Articles | Metrics

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The Whole Processes Feedwater Control Tactics of Domestic 600MW Supercritical Unit LIANG Fu-yu;ZHUANG Jian-hua Huadian Technology    2008, 30 (7): 64-67.   Abstract （2903）            Knowledge map    Save Focusing on the whole processes feedwater system of Guohua Taicang Power Plant, this paper analyzed the feedwater control system in detail, and proposed the control tactics for realizing whole processes feedwater control system. The relevant operation parameters and operation curves which obtained after the control system put into operation were introduced for a reference. Related Articles | Metrics