Integrated Intelligent Energy

Coal powder decoupling combustor development

HAO Jiangping1,WANG Jing2,LOU Huiru3,GAO Shiqiu4

2016, 38(7): 1-3.

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Abstract:Coal powder burning initial stage low NOx emission principle was analyzed. A kind of direct flow decoupling combustor for low volatile matter was introduced. This combustor applied horizontal multistage staged combustion. Thick side coal powder flow can be separated into thick and thin by powder collector, flame holder and other devices. Heat to flame side ultra thick flow was enhanced. Besides increased the combustion stability, the coal pyrolysis and gasification production was efficiently utilized. Microcosmic air staged combustion was deepened. NOx generation was reduced. Based on the simulation calculation, coldstage and hotstage experiment on 1025t/h boiler decoupling combustor, the design thought of coal powder combustor was proved. 

Design of fault discharge along surface in live detection faultiness simulation device

SUN Dalu1,JI Shengchang2,HE Dandong3

2016, 38(7): 4-7.

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Abstract:For live detection and training, State Grid Xinjiang Power Company developed a set of live faultiness simulation device. This device featured with fault discharge along surface and many other common fault model. Based on the electric field distribution while fault discharge along surface, this paper discussed the effect of fault parameter on the electric distribution. Fault discharge along surface minimodel was established. Based on research, if voltage boosted to 5kV, DMS ultrahigh frequency partial discharge meter will capture the partial discharge signal; if voltage boosted to 9kV, test model generated corona and typical partial discharge pattern; there will be continuous breakdown if voltage boosted to 27kV. Approximate range of fault parameter was determined. Partial discharge live detection simulating device well performed in research and training.

The control strategy of fast cut back test for 622MW power unit

ZHAO Weigang, WANG Hongjie, ZHU Jiaying

2016, 38(7): 8-10.

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Abstract:In recent years, all countries in the world improve the requirements of power system reliability, which are the power unit should have the fast cut back (FCB) function, and meanwhile it could run reliably in islanded mode and have the capability of grid reconnection. Taking the 622MW power unit of a certain power plant in Vietnam as an example, this paper introduced the optimized control strategies of the turbine speed, turbine bypass and drum water level, analyzed and solved the problems that existed in the FCB process of power unit, which ensured the normal operation and the gridreconnection capability of power unit.

Research and development on optimization of design software on the cooling side of indirect dry cooling system

XUE Haijun1,WANG Yongxin1,SHI Lei2

2016, 38(7): 11-14.

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Abstract:To ensure the safe, stable and economical operation of indirect dry cooling (IDC) power plant, the optimization and design software of indirect dry cooling system is developed through minimum annual total cost method. The programming ideas, configuration and framework, research strategies, implementation steps and calculation methods on hot end, cold end and tower shape optimization software of indirect dry cooling system are introduced. The correctness is validated by real IDC engineering projects.

Optimization design of low temperature economizer in thermal power plant

MA Jinxiang, CHEN Jun

2016, 38(7): 15-19.

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Abstract:This paper elaborates design thoughts of low temperature economizer in thermal power plant，analyses merits and demerits of each design thought. Take an example of low temperature economizer located before dust remover in 600MW unit, this paper designs two layout plans for low temperature economizer. By comparison of economic efficiency and combination of growing flexible metal enamel anticorrosion technology, this paper proposed a design scheme which comes with slightly low income but small investment and steel consumption amount.

Optimal start up on 600MW steam turbine

HUANG Xiaojun

2016, 38(7): 20-24.

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Abstract:According to the status of Hunan Huadian Changsha Power Generation Company Limited，this paper adjusts allocation of turning time of turbine startup and startup parameters under a reasonable condition. In the process of implementation，mediumspeed warming has shortened from 4.0h to 2.5h，which improves warming efficiency and ongrid energy. Finally，this paper proposes a optimization measure which is to add cylinder drying device.

Gassteam combined circulating heat and peakload unit hot start improvement

WU Minjie, TANG Mingfeng

2016, 38(7): 25-27.

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Abstract:To increase the economical efficiency of 6FA combined circulating heat and peakload unit hot start, steam that unqualified for stream turbine stroke was utilized for heat supplying by applied desuperheating and reducing devise. Economical efficiency analysis indicated that unit operation cost was reduced after improvement.

1000MW unit steam valve group pressure loss improvement design

MENG Tan

2016, 38(7): 28-31.

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Abstract:A power plant’s 1000MW unit steam turbine valve group loss improvement and the principle of vacuum compensation implement was introduced. Unit valve group loss improvement design and test data, improvement measurement and result was stated.

Research and analysis of application of single system on coal handling system

QIAN Ximing

2016, 38(7): 32-34.

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Abstract:The feasibility and hidden trouble of application of single on power plant coal handling system was analyzed in the following eight aspects: the design and operation of coal handling system; effect of coal storage residue; effects of damageable parts; defect research and analysis system of coal handling system; feasibility of apply single system on coal handling system; and comprehensive analysis. 

Selection of power plant coal handling equipment antiabrasion and abrasion resistant material

FENG Zhiyong1, WANG Xiaobin2

2016, 38(7): 35-39.

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Abstract:Power plant coal conveying equipment used in the presence of large amounts of wear phenomenon, not only affect the normal use of equipment, serious when even stop generating equipment damage and equipment. As a result, not only affect the power safety and effectiveness of the unit, also make up the damage to the coal environment. Power plant coal conveying system equipment how to choose to wear materials, how to correctly wear measures were described in detail.

Condensation water precision processing high speed mixed bed periodical water production reducing cause analysis and treatment

LI Junjun1, XU Misheng2, LIU Xiuhong2

2016, 38(7): 40-42.

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Abstract:Compared to initial operation stage, a power plant’s condensation water precision processing high speed mixed bed periodic water production is obviously lower. After analyzed factor could affect water production, authors indicated that the mixed bed exchange terminal control is irrational, mixed bed resin filling reduced, cationanion resin fill proportion is irrational, and other causes. This paper advised to change mixed bed water outlet water quality standard and to adjust resin filling plant. After treatment, even the cationanion resin filling proportion was not adjusted, the periodical water production was increased 30000 tons and above.

Analysis on the reason and countermeasure about low pressure rotor blade corrosion in 300MW steam turbine unit

GAO Qiangsheng1,ZHAO Suping2

2016, 38(7): 43-46.

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Abstract:In the circumstances that thermal power plant has been running great under highparameter, this paper chose a certain power plant to analysis the reason caused low pressure rotor corrosion in 300MW unit, including moisture control indicators, vacuum degree of the unit, initial condensing zone, shutdown boiler protection, etc. This paper also brings about precaution to above situation to make sure safe operation of the unit.

Zhejiang Beilun Power Plant KPAV100 reducer gear damage cause and renovation

LIU Wenyuan

2016, 38(7): 47-50.

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Abstract:Zhejiang Beilun Power Plant unit No.1 was put into operation in 1991. Due to worse coal condition and increasing heat load, pulverizer load was increased accordingly. Which caused reducer overload, gear damage, thrust pad temperature rise and other problems. Thus the power plant planned to extend pulverizer capacity. After disassembled one reducer and analyzed gear damage, parts characteristics was outlined, improvement plan was made. 

Application of equilibrium charge type oil filter on hydro turbine speed governing system

YU Yue, WAN Yongfa, ZANG Weijie, JIAO Yufeng

2016, 38(7): 51-53.

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Abstract:For the hydro turbine of Xiaolangdi Hydropower Station, a large amount of fatlute was formed in the operation of cylindrical valve hydraulic system of speed governor, which caused the phenomena of operation delay and jam of control valve group and influenced the safe and stable operation of unit. This paper analyzed the composition of fatlute and its causes, and selected equilibrium charge type oil filter for the online fatlute filtration by comparing two types of electrostatic oil filter, which had good using effect and the jam phenomenon of control valve group did not occur any more.

Research on driving technology by steam and power in power plant auxiliary equipment

LI Zhongjiang，HAN Ling

2016, 38(7): 54-55.

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Abstract:Based on the mismatching between extraction parameters and the parameter that heat consumer needs，this paper compares several countermeasures that were used more often and studies a driving technology by steam and power，which maximally saves throttling loss and energy.

Analysis of a 330MW steam turbine generator unit shaft vibration and solving

MA Benteng, XU Tao, WEI Xiuchen

2016, 38(7): 56-57.

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Abstract:The authors analyzed the incident of a 330MW unit shaft vibration, and indicated that the main causes is rotor mass unbalance. After solved the problem of unbalance, the problem of shaft vibration was solved.

Experiment on influence of exhaust gas temperature to air preheater 

ZHANG Guobin

2016, 38(7): 58-59.

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Abstract:Based on the high rate of ammonia escape，Huadian Weifang Power Generation Company Limited reduced the capacity of pressure fan of boiler A，and the air transfer of air preheater A，which brings the exhaust gas temperature up high to 200℃ above and made NH₄HSO₄ become solid state instead of liquid and gas.According to the experiment，increasing exhaust gas temperature in order to reduce the differential pressure of air preheater.

Study on high side negative sequence over current protection setting of low voltage station service transformer

WANG Lü

2016, 38(7): 60-61.

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Abstract:The relationship of both side current of LV plant service transformer Dyn11 connection was analyzed. By calculating the asymmetric shortcircuit current of HV side, negative current protection adjustment principle was confirmed[1]. Finally, cooperative relationship of negative current protection and next stage protection was indicated.

Modification of antiwind device for bridgetype grab ship unloader

ZHAO Junfeng

2016, 38(7): 62-64.

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Abstract:The bridgetype grab ship unloader initially designed by Fujian Datang International Ningde Power Generation Company Limited can guaranteed that the ship unloader could run under 20m/s wind speed. However, the situation is occasionally 31m/s wind speed, which means the initial design for ship unloader could hide trouble in safety and a modification needs to be done. This paper elaborate that the ship unloader could be modified through wheelpressure, rail clamping or rail brake’s antiwind device, and also gives merits and demerits to these methods. According to the ship itself, this paper suggests to install wheel gripper on the rail clamping device, hence substantially improves safety and reliability.

Reliability improvement of bucket wheel machine power supply

BU Fanwei

2016, 38(7): 65-66.

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Abstract:According to the frequently power source fault and low reliability, this paper provides a method to improve power supply mode, which switch trailing flat cable to sliding contact line, and gives a detailed introduction on the progress and the focus of maintenance of improvement plan. After the improvement, the power supply of bucket wheel will be greatly enhanced.

Combined application of gas combined cooling heating and power supply technology and ground source heat pump

YANG Song

2016, 38(7): 67-69.

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Abstract:This paper introduced the feature and the advantages of gas CCHP supply technology and ground source heat pump. Configuration plan was provided based on the analyzed load. After calculation, design parameter of outdoor heat exchange was confirmed. By analyzing outdoor heat exchanger cool and heat balance, system operation will not affect the soil temperature. Finally, matters need attention was indicated.

Operation analysis of SNCR flue gas denitrification system of CFB boiler and its improvement

XU Ketao, FENG Qianwei, PEI Yukun, ZHANG Yang

2016, 38(7): 70-73.

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Abstract:For the selective noncatalytic reduction (SNCR) flue gas denitrification system of circulating fluidized bed (CFB) boiler, some problems are existed when it is operating under low load condition, such as low denitration efficiency, high escape rate of ammonia, etc. Combining the engineering practice, this paper analyzed the operating conditions of circulating fluidized bed units that adopting the SNCR denitration technology under different working conditions, and proposed corresponding improvement suggestions for the existed problems in the operation of SNCR denitration system, which provided a basis for the safety, economic and stable operation of power plant.

Transformation plan for NOx ultra low emission in a 600MW unit

ZHANG Jinzhu, JI Jinfang, LIANG Xinlei, LI Na

2016, 38(7): 74-75.

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Abstract:This paper points out that even if a certain power plant with supercritical unit meets the requirements of NOx emission, the NOx desorption can still be a big problem, which need to be upgraded. According to coal property and power plant’s actual situation, it is suggested to transform the combustor and add selective catalytic reduction system. Mass concentration of NOx emission is below 50mg/m3 after the transformation, which not only meet the requirements of emission standard, but also lower the cost of NOx desorption.

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