Table of Content

25 June 2017, Volume 39 Issue 6

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Application research on cooling system of passive natural circulation wind power engine room

ZHOU Tao1, 2, 3, MA Dongliang1, 2, 3, CHEN Baixu1, 2, 3, QI Shi1, 2, 3, SONG Zhenlong4

2017, 39(6):  1-5. 

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The effective forcedair cooling of wind power engine room could ensure the safe and efficient operation of wind turbine unit in hot weather. Through building a simulation model of wind power engine room, this paper simulated the engine room before and after the installation of wind gathering cover. The results shows that the temperature in engine room drops significantly as the increasing of environmental wind speed, when the wind speed is greater than 8m/s, the temperature difference between engine room and environment is less than 3℃ and the larger the external wind speed, the smaller the temperature difference. After the installation of wind gathering cover, the failure of wind turbine unit caused by high inner temperature in engine room was reduced, and it improved the economy and safety of wind turbine unit.

Local distributed busbar protection ability analysis

CHEN Qi1,2, CHEN Fufeng1,2, ZHANG Yao1,2, WANG Yongxu1,2, TANG Zhiguo1,2

2017, 39(6):  6-9. 

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This paper introduced existing distributed busbar protection plans, and compared localized distributed busbar protection and traditional centralized busbar protection based on reliability, speed, selectivity and sensitivity. By analysis and test, these two methods have same performance of selectivity and sensitivity. Local distributed busbarprotection is more reliable, fasterand more convenient of installation and maintenance than traditional busbar protection. Through the comparison of various performance, distributed bus protection has the potential to replace the traditional centralized bus protection. Which is the developing direction of new generation intelligent substation busbar protection.

Distributed realtime database migration technology based on multisource data

WANG Jin1, LIU Yang2, ZENG Jianyong2, DENG Dawei2, ZHONG Wei1

2017, 39(6):  10-13. 

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With the development of automatic scheduling system, the transverse integration and vertical through of stages of scheduling system is kept being enhanced. The requirements of sharing of model and data between stages became more and more. The conventional model, due to complicated sharing method and related to operation on commercial library, has the risk that affect the system model. The distributed realtime database migration technology based on multisource data was indicated. Which is high efficiency and fast, and effectively avoid risks mentioned above. Pros and cons of existing data migration method of power grid scheduling automatic system was analyzed. Relative key technology was introduced. The implementation of this technology on Guangdong Power Grid Corporation Center for Power Scheduling and Control OCS proved that this technology increased the model maintenance efficiency, ensured the safety, enhanced the integration of scheduling system, and provided technical support to provincial and local intelligent power grid construction.

Wind power plant wind turbine unit performance evaluation research based on laser radar anemoscope

FU Li, LIU Xiaoguang

2017, 39(6):  14-16. 

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Based on the problem of wind turbine unit acceptance after warranty and difficult to evaluate real power rate curve, a laser radar anemoscope was introduced. Combined with wind turbine unit SCADA (supervisory control and data acquisition) system data, a rapid evaluation method was indicated. This method was implemented onto a power plant of 22 units. The result indicated that the power rate curve of unit No.12, 13, 17 and 21 was poor. This method is accurate, simple and practical. Which could be referred for wind turbine unit evaluation.

 

Optimization of condenser tube bundle arrangement pattern and its application effect analysis

CAO Rong1,2, NING Yuqin1,2, HU Qing1,2

2017, 39(6):  17-19. 

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In order to solve the substandard pressure problem of a condenser for coalfired power plant, this paper proposed a new bionic tube bundle arrangement pattern for the condenser, and replaced the copper tubes with stainless steel tubes. The system commissioning test shows that after the optimization of condenser tube bundle arrangement pattern, the condenser pressure decreases by 0.88kPa, the supercooling degree is less than 0.5℃, the condenser thermal performance is improved greatly, the eddy and air accumulation phenomena are not found in the main condensation region, and the unit could save standard coal 2.64g/(kW·h), which has a good economic benefits and environment protection benefits.

Integrated feeder automation based on partitioned and layered mode case study

2017, 39(6):  20-22. 

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To handle the power distribution network fault, trinational feeder automation system program flow was analyzed. The drawback of this process while handling complicated fault was indicated. Applying partitioned and layered monitoring distribution to teat failure will flexible handle fault and enhance system facing extreme case such as composite fault.

Separator transformation and optimization of doubleinlet and doubleoutlet coal mill for a 300MW unit

LI Jieyi1, TAN Houzhang2, HAN Ruiwu2, LI Bing1, ZHEN Zhiguang1, ZHENG Haiguo3, YANG Hao3

2017, 39(6):  23-24. 

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:For the 300MW boiler in Shijiazhuang Liangcun Thermal Power Company Limited, a MGS4062 type doubleinlet and doubleoutlet coal mill is adopted. As the declining of coal quality and the increasing of coal impurities, there is a serious blocking problem for the matched radial baffle type separator, which influences the unit load capacity. Through transforming the separator into a twostage axial type and adding impurity filters at powder outlet and inclined powder returning pipe, the pulverized coal uniformity index is greater than or equal to 1, coal mill unit consumption decreases by 12.2% and coal mill capacity increases by 36% under normal capacity condition. Meanwhile, the impurities of coal are filtered and cleaned out to avoid blocking the primary air pipe and clapper.

Coal storage and using strategy based on inventory theory and linear programming

CHEN Peng1, YANG Jingpei1, GAO Jianqiang2

2017, 39(6):  25-27. 

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The limited supply and shortsupply not allowed coal storage model was built based on inventory theory. This optimized the coal ordering strategy. After analyzing coal mixture ratio by built objective linear equation and constraint equation, coal consuming strategy was optimized. This ensured lowest unit coal cost. Take Anhui Energy Corporation Company Huaibei Guoan Electricity Company Limited the first quarter coal purchasing as study objective, by comprehensive analyzing coal storage and utilization, economic storage and using was realized.

S109FA gassteam combined cycle unit D10 steam turbine performancediagnosis analysis

CAI Yu1, ZHAO Lijuan2, DING Yongneng2, LI Wei1

2017, 39(6):  28-31. 

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Based on the structure feature of a power plant’s S109FA gassteam combined cycle unit D10 steam turbine, the performance data of different test period was compared. It was indicated that the unit performance lost in the past 10 years. Combined with the problems found during maintenance, the causes of performance loss were indicated as high pressure cylinder vane damage and flow part scaling. Prevention measurements and suggestion was indicated. This performance analysis could be referred for performance improvement projects of similar units.

Service power system reconstruction plan and application practice after thermal power plant unit close down

ZHAO Qingming, XIAO Mingwei

2017, 39(6):  32-36. 

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With the development of energy saving and emission control, it is inevitable that small coalfired units be close down. After Huadian Zibo Heat and Power Company Limited third stage extension project (2×330MW) unit put into operation, the first stage was closed down. Due to the relevance of first and second stagey water, steam, coal and electricity system, this paper introduced a service power system reconstruction plan based on safety economy and smooth transition. Combined with specific implementation process,relevant project management method and experience was summarized.

Study on the transformation and optimization of 660MW ultra supercritical boiler burner

CAI Hongming

2017, 39(6):  37-40. 

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With regards to the severe damage of a 660MW ultra supercritical boiler burner operation after a period of time, based on the analysis of improved method of burner to reduce corrosion and reducing atmosphere of side wall , and through the study on optimization of transformation, effectively reduce the NOx emissions and ensure complete combustion, which has instructive sisignificance to study on combustion adjustment type of boiler.

A new method to prevent boiler coking and coke dropping study and implementation

RAO Hongjian

2017, 39(6):  41-43. 

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Huadian Xinxiang Generation Company Limited adopted two units of supercritical pressure oncethrough boiler, which was troubled with boiler coking and coke dropping. To solve this problem, the plan of adding anticoke air and separating air on both side wall was indicated and implemented. The result proved the effectiveness.

Analysis and test on 500kV surge arrester overheating caused by ceramic capacitor abnormal

ZHANG Yanke1, ZHOU Guowei2

2017, 39(6):  44-46. 

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:Ceramic capacitor plays an improve internal voltage distribution within the arrester, to inhibit the action of the external stray capacitance effects. In this paper analysis and test on 500kV surge arrester overheating caused by ceramic capacitor abnormal. A variety of online detection means shows that  arrester within equalizing capacitor; further offline test and disassembly analysis found that existence of ceramic capacitor upper and middle section exists, verify the analysis. In view of the fever abnormal surge arrester, corresponding measures are put forward.

Study on primary network water systems combination for heat source side of a thermal power plant

XU Bing, SONG Hongfei

2017, 39(6):  47-50. 

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For the heating network of a certain thermal power plant, the primary network water systems of the first and second stages are operating independently. Between the return lines of the first and second stages, connecting valves are equipped. Besides that, some connecting doors are also equipped for water supply lines in multiple places. In order to realize the mutual standby among the 9 circulating pumps of the first and second heating network stages, solve the ultraflow operation problem of single heater of the second stage and maximize the performances of heat pump and electric heat storage device, this paper conducted a primary network water systems combination operation test between the first and second stages. The analysis result of the test data shows that it effectively improves the reliability, flexibility and economics of the heat supply.

A 600MW power plant boiler pulverizing system  undercapacity cause analysis

XIONG Feng

2017, 39(6):  51-54. 

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The problem of output capacity of 600MW power plant boiler No.1 pulverizing system was analyzed based on tests. The causes were indicated, and suggestion for improvement was provided. Based on theoretical calculation, this problem could be remarkably improved.

Oil system pipeline vibration and other abnormal occurrence treatment

WANG Dawei, GU Qing

2017, 39(6):  55-58. 

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Jiangsu Huadian Qishuyan Power Plant Company Limited has two units  gas turbine, After put into operation, one of these units has the problem of oil pipeline vibration, lubricating oil tank resonance, AC lubricating oil pump over current and other abnormal occurrences. Which threatened to unit operation safety. After analysis and treatment, pipeline vibration and overcurrent was eliminated, unit health degree and energy saving performance was enhanced.

600MW supercritical W flame boiler water pressure test system improvement

ZHUO Renchun

2017, 39(6):  59-60. 

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The practice that use air preheater high pressure wash pump as boiler primary system hydraulic test boost pump was introduced. The water source, pipeline and control system was improved. The improvement of existed boiler primary system hydraulic test system was realized. The problems of long time consumption, complicated operation, high tests cost and maintenance delay was avoided.

Operation and fault analyses of boiler water circulating pump

ZHANG Lei

2017, 39(6):  61-63. 

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This paper introduced the effects of boiler water circulating pump at the startup initial stage of ultrasupercritical unit, and analyzed the operation modes of boiler water circulating pump at different stages. After that, it analyzed the easily appearing problems in the debugging process of boiler water circulating pump and proposed corresponding prevention measures, which had a certain referencesignificance for the safe and steady operation of safe and steady operation at the debugging and startup initial stages.

Application of WeChat snapshot in safety management

SHEN Fengtian, TANG Haifeng

2017, 39(6):  64-65. 

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Based on the popular topic of Internet+, the safety management mode needs innovation. WeChat provides safety management staff a platform that could supervise the operation at any moment. Which will also involve every layer of management into the safety management. Potential risk identification was enhanced by WeChat. Exposure on WeChat is more vivid that will strengthen the safety awareness of each personnel.

Typical coalfired power plant pollutant control device mercury removal performance analysis

WANG Aijun1, SU Junhua2

2017, 39(6):  66-69. 

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The performance of mercury removal was test based on a typical domestic coalfired power plant. The composite mercury removal technology, consist of SCR, FF and WFGD, was analyzed. The mercury mass balance was calculated. Mercury removal strategy was indicated.

Thermal power plant acidbase leakage risk management

ZUO Junjie, L Xinfeng

2017, 39(6):  70-71. 

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Acidbase leakage is one of the difficulties of thermal power plant equipment treatment. Based on a power plant, the main causes and existing problems of acidbase leakage was analyzed. To ensure the stability of acidbase system, prevention measurements were indicated from equipment material selection, system alignment, operation, polling, maintenance and inspection.

The causal analysis and treatment for ash fouling of gas cooler in 600MW unit

PENG Yujun

2017, 39(6):  72-74. 

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In this paper, based on the gas system in Huadian International Fengjie Power Plant, the cause of ash fouling in media gasgas heater (MGGH) was analyzed. According to the actual operation experience of such system, the effective treatments to solve ash fouling were proposed, which improved the MGGH performance and increased the gas temperature from the outlet of desulfuration absorber tower. Finally, the treatments were proved to be capable of ensuring the operation safety of absorber tower rear flue and chimney, and solving the plume phenomenon in chimney.

The methods of decreasing the failure rate of dry deslagging system for a 1000MW unit

YANG Jie, LI Hongquan

2017, 39(6):  75-76. 

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Once the dry deslagging system of coalfired power plant boiler failed, it had a great influence on the safe and steady operation of boiler. This paper analyzed the failure reasons of dry deslagging system of parametric voltage transformation direct current Πtype boiler for a 1000MW ultrasupercritical unit, and proposed some measures to reduce the failure rate of dry deslagging system, such as strengthening combustion control, adjusting boiler soot blowing methods, adjusting the operation mode and strengthening the parameter adjustment of dry deslagging system, etc.