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中文
Table of Content
25 August 2014, Volume 36 Issue 8
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Performance optimization of doubleended ball mill of Pucheng Power Generation Company Limited
MA Zhian1, ZHAO Guangxun1, WANG Haizhu1, GUO Fan1, DONG Fang2
2014, 36(8): 1-2.
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Abstract:There were problems in the doubleended ball mill of Shanxi Huadian Pucheng Power Generation Company Limited. The problems existed in many aspects of the mill, which include the lining board, the separator, the clapper, the material quality and metal content ratio of the ball, the primary hot air passage system, the oil injection device of the large gear wheel, the sealing air fan of large gear wheel cover and others. Aiming at above problems, the mill system was reformed, and its performance was optimized. The large boiler slag content reduced from 17% to 5%～ 7%, and the content of combustibles in fly ash reduced from 6% to about 3%. The safety and economic efficiency of the unit were improved.
Automatic generation control management benefitenhancing measures of gridconnected generator units
ZHANG Bo, DONG Hongjiang
2014, 36(8): 3-5.
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Abstract:The gridconnected power plant management appraisal system is of important significance for enhancing the rewards and punishment of AGC, improving AGC management level, saving energy and reducing emission, improving enterprise’s benefit and enhancing the reliability of power grid operation. The concrete AGC management benefitenhancing measures of Huadian Zhangqiu Power Generation Company Limited were introduced. The application result shows that favorable economic benefit was obtained by adopting the AGC management benefitenhancing measures.
Application of software AFT Arrow in calculation of steam leakage rate of steam turbine shaft seal
DU Yingzhi
2014, 36(8): 6-9.
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Abstract:Using the fluid simulation software AFT Arrow, the steam leakage pipe model of steam turbine shaft seal was established. The flow setting method and the pressure setting method were used to calculate the steam leakage rate of the shaft seal respectively, and the features of the two calculation methods were analyzed. The calculation results can be used as reference for the turbine manufacturer in shaft seal system design and for the design institute in optimization of piping layout.
Experimental research on optimization adjustment of coal pulverizing system of 600MW unit
HE Jinbo, ZHUANG Guolin, FU Yongqiang, LI Kui, CHEN Naixiao
2014, 36(8): 10-13.
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Abstract:There were several problems in operation of the 600MW unit of Zhanjiang Zhongyue Energy Corporation Limited, which include that the maximum deviation of the primary air velocity is larger, the deviation of the two side temperature and two side oxygen content of the air preheater are larger, the fineness of pulverized coal is more coarse, and the power consumption for coal pulverization is higher. Aiming at above problems, several experiments were carried out, which include the primary air velocity balance adjustment, the adjustment of baffle opening of the splitter, the loading force changing experiment, the output changing experiment and the air flux changing experiment. According to the experimental results, the unit operation parameters were optimized and adjusted. The equilibrium of the coalair ratio of the mills and the fineness of pulverized coal were improved. The power consumption for coal pulverizing was reduced. The economic efficiency and safety of the unit were raised.
Function perfecting of distributed control system of 600MW unit
LI Qiufeng, LIU Shuwei
2014, 36(8): 14-16.
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Abstract:In Harbin Third Power Plant of Huadian Energy Company Limited, after the distributed control system of the 600MW unit was put into operation, the system operation was unstable. So the unit stability lowered greatly, and the safe operation of the plant was affected. Combining with the actual situation of the unit operation, the occurred problems were analyzed one by one, and the solving scheme was proposed. After the scheme had been implemented, favorable results were obtained.
Research on grounding scheme of oversea thermal power plant in high soil resistivity area
ZHOU Zhengyi
2014, 36(8): 17-18.
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Abstract:Aiming at the concrete loca resource condition of the 2×60MW coalfired power plant in Combodia, considering the requirements to reduce the soil replacement amount, to control the cost rationally and to ensure the project duration, the concrete grounding scheme was put forward. According to the rule of the file IEEE 80—2000“Guide for Safety in AC Substation Grounding”, the permissible values of the step voltage and the contact potential were verified, and it was ensured that the grounding resistance in whole plant can meet the requirement of the project contract.
Application of ANSYS finite element analysis software in type selection and design of belt frame
TANG Yongtao, NIU Junyan
2014, 36(8): 19-20.
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Abstract:Taking the type selection of the belt frame of reversible ringtype distributer in extension project phase II (2×300MW class) of Datang Thermal Power Company Limited of Datong Coal Mine Group as example, the modeling and analysis were completed in ANSYS finite element analysis software directly. The development period was shortened, and the reliability of the belt frame was improved.
Application of gap selfcompensating air leakage control system in air preheater seal reformation
XU Baiqiang, SUN Yanwei
2014, 36(8): 21-23.
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Abstract:The larger air leakage rate of the rotary air preheater is difficulty troubling many large power generation enterprises, and it influences on unit economic operation seriously. Using a new air leakage control technology —— the gap selfcompensating air leakage control system, the Harbin Xinglong Boiler Company Limited implemented the air preheater seal reformation of unit No.3 in Ezhou Power Generation Company limited of Hubei Energy Group during the unit overhaul period. After reformation, under unit full load and variable load conditions, the air leakage rate remained within 4%～5% for long term, and the unit economic operation was ensured.
Application of 330kA thyristor rectifier cabinet in reformation of rectifier station of electrolytic aluminium enterprises
SUN Zhenbin
2014, 36(8): 24-26.
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Abstract:Taking the Inner Mongolia Datang International Recycling Resource Development Company Limited as example, the technical requirement of the electrolytic aluminium enterprise was introduced. The structure and principle of the electrolytic rectificate power and its practical operation situation were described. The technologies used in the rectificate power reformation were analyzed. Some suggestions for element selection were given, which can be used as reference for treating similar problems.
Case analysis of major shaft fracture for the circulating water pump in a certain power plant
NIU Wenxian1, NIU Baoxian2
2014, 36(8): 27-29.
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Abstract:A fracture accident occurred to major shaft of the circulating water pump for the super critical unit in a power plant. The fracture of major shaft for the circulating water pump was inspected, through spectral analysis and metallography were hardness test. According to the test results, the causes of c major shaft fracture of the circulating pump were analyzed, and relative precautionary measures were put forward.
Application of lowtemperature combustion method in east Junggar coalfired boiler
LI Peng, ZENG Qi, ZHANG Dade, YU Liyang
2014, 36(8): 30-33.
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Abstract:The quality and coking mechanism of east Junggar coal was analyzed. The lowtemperature combustion method was introduced. Based on a large amount of experiment and research, using the lowtemperature combustion method, the east Junggar coal blending combustion by eighty percentages was realized first, and the boiler can operate stably with full load. The experience of the boiler can be used as reference for other east Junggar coalfired power plants to prevent and lighten boiler coking.
Analysis on reasons of primary air fan fault tripping accident of 1000MW unit and treatment
FANG Min
2014, 36(8): 34-37.
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Abstract:The fault tripping process of the primary air fan moving blade actuator of a 1000MW unit was introduced. The reasons of the accident and the problems encountered in accident treating process were analyzed. The treatment countermeasures under different coordination modes and the primary air fan stall treating method were put forward.
Optimization experiment of east Junggar coal blending combustion in a boiler
WU Libin
2014, 36(8): 38-40.
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Abstract:In the 1065t/h boiler of a power plant, an experiment of blending combustion of the east Junggar coal mixed with the local coal was carried out. The comprehensive performance of the boiler under different mixed ratio, different coal quality and different mills was analyzed. Depending on the site experiment and the analysis and comparison of the cola quality, the safety and economic efficiency of the boiler under different blending ratio of east Junggar coal were grasped, which provides guide for the boiler to operate in rational mode under east Junggar coal blending combustion.
Lifting method of main plate girder K5 of 330MW unit technical reformation project in Datang Lueyang Power Plant
WU Qianping
2014, 36(8): 41-43.
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Abstract:In order to accomplish the lifting of the main plate girder K5 of the 330MW unit technical reformation project in Datang Lueyang Power Plant, according to the hoisting point choosing principle, the hoisting point and load distribution scheme was determined. The difficulties of hoisting were analyzed. According to the relevant provisions in the file DL 5009.1—2002 “Code of Safety Operation in Power Engineering Construction”, the lifting plan was determined, and the key points of the lifting operation were given. According to the lifting plan, the main plate girder K5 had been installed on correct position safely.
Analysis on reasons of poor ash discharge of positive pressure pneumatic ash removal system and treatment
ZHANG Xiaobo
2014, 36(8): 44-45.
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Abstract:The working principle of positive pressure pneumatic ash removal system of Guangdong Yudean Yunhe Power Generation Company Limited was introduced, several problems, which often occurred during the pneumatic ash removal system commissioning period, were discussed, the reasons of ash deposition in ash hopper of electrostatic precipitator were analyzed, and relevant resolution was proposed, aiming at the valve type selection and the problems needing attention in circulating fluidized bed boiler commissioning, some suggestions were given.
Analysis on steam flow excited vibration fault of 600MW steam turbine generator unit and treatment
CHEN Hao, BING Hankun, XU Houda
2014, 36(8): 46-48.
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Abstract:Taking the 600MW subcritical steam turbine generator unit of a power plant as example, the features of steam flow excited vibration fault of the unit were introduced. The fault mechanism was analyzed. The fault treatment process was expounded. After the fault had been treated, better result was obtained.
Analysis on reasons of false trip of 6kV motor undervoltage protection and improvement
LI Man, XIAO Yao
2014, 36(8): 49-51.
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Abstract:An undervoltage protection false trip accident was analyzed. The voltage transformer wire broken fault occurred firstly due to operator's incorrect manipulation. Then the PT disconnection did not lock the undervoltage protection. So the undervoltage protection tripped incorrectly. The principle and judgement logic of the protection device PT disconnection were analyzed. The influence of outside electromagnetic elements on the voltage sample circuit of the protection device was investigated. The undervoltage protection lockout logic was improved and perfected, and the false trip accident was avoided.
Operation practice of hydraulic turbine governor power mode in Suofengying Hydropower Plant
TIAN Lun
2014, 36(8): 52-54.
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Abstract:The original governor of the Suofengying Hydropower Plant of Wujiang Company has various defects in its function and accuracy and can not satisfy the operation requirement. The reasons of the defects were analyzed, and the solutions were proposed. The original hydraulic turbine governor was replaced by a new type one. The governor can operate in power closed-loop mode. The experiences of this paper can be used as reference for other hydropower enterprises to solve similar problems.
Analysis on influence of electric braking on negative sequence overload protection
WU Chaobo, FENG Xin
2014, 36(8): 55-56.
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Abstract:When the electric braking device is used to stop the hydrogenerator, the negative overload protection tripped incorrectly and gave relevant signal. Starting from multiple angles, which include the principle of negative sequence overload protection of generator, the principle of electric braking and the sampling principle of protection devices, the reason of the false trip accident was analyzed. The influence of the generator electric braking on the negative overload protection operation of the generator was summarized.
Optimization of soot blower system of desulphurization system gasgas heater
ZHU Chenxi
2014, 36(8): 57-60.
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Abstract:The flue gas desulphurization system gasgas heater (GGH) of a power company was researched. The influence of GGH blockage on the desulphurization system was analyzed. The pressure air soot blower system was optimized. The steam jet soot blower system was installed additionally for GGH. The soot blowing mode and the soot blower control strategy were optimized. Then the GGH blockage was mitigated, the GGH operation pressure drop was decreased, and the safe and reliable operation of the flue gas desulphurization system was ensured.
Features of SCR flue gas DeNOx technology and its design management
CUI Chao
2014, 36(8): 61-64.
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Abstract:The features of SCR flue gas deNOx technology and its design management were summarized. The suggestion to improve the design management was proposed. The management and control of the deNOx design were enhanced, and the design quality of deNOx technology was improved, which are useful for the EPC company to shorten the project construction period and to reduce the construction cost.
Optimization of ammonia spraying automatic control loop of flue gas deNOx system
MAO Yisheng
2014, 36(8): 65-67.
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Abstract:The ammonia spraying automatic control loop of the flue gas deNOx system of 2×600MW unit in Guangdong Yudean Zhuhai Jinwan Power Plant was introduced. There were problems in operation of SCR deNOx system of thermal power plant, such as the selection of the minimum ammonia injection temperature, the too frequent start/stop operation of the ammonia spraying system and the poor effect of the ammonia automatic spraying. The problems were described, and the reasons of the problems were analyzed. The solutions were proposed.
Analysis on reuse technology of circulating water blowdown water in 2×500MW thermal power plant
WU Xi
2014, 36(8): 68-69.
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Abstract:In a power plant in Shanxi, the circulating water blowdown water was treated by the highfiltering velocity fiber filter, the pressure ultrafiltration and the reverse osmosis, and was reused as water source of boiler makeup water and the supplementary water for heat network. The circulating water blowdown water reuse scheme of the plant was introduced. The features of the circulating water blowdown water reuse technology were expounded, and the economic benefit and social effect of the technology were analyzed. The result in this paper can be used as reference for handling with similar problems.
Research on corrosion of air preheater of biomass fueldirectly fired boiler
JIA Shaogang1, WANG Dingcai2, DING Heng2, GUO Junhai3
2014, 36(8): 70-72.
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Abstract:The reasons of corrosion of the air preheater heat exchange tube bundle of a biomass fueldirectly fired boiler were analyzed, and it was determined that the air preheater's corrosion is caused by the low dewpoint acid corrosion and the alkali metal deposit corrosion. The air preheater heat exchange tubes had been replaced by enamel tubes. Then the air preheater operates in good condition for a long term, the hot air temperature is much higher than design value, and the enamel tubes do not corrode basically. The comprehensive service live of the enamel tube is much longer than the service live of original steel tube. The economic efficiency of the unit was improved.
Analysis on feasibility of biomass fuel blended combustion in Togtoh Power Generation Company
FENG Yufeng
2014, 36(8): 73-75.
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Abstract:The biomass fuel is renewable clean energy source. To fire the blended biomass fuel with coal in power plant can reduce the emissions of CO2, SO2 and NOx. Starting from the angles of economic efficiency of biomass fuel blending combustion and the possible problems, the feasibility of biomass fuel blending combustion in Inner Mongolia Datang International Togtoh Power Generation Company Limited was analyzed. The problems of biomass fuel blending combustion process were summarized, and relevant solutions were proposed. The results in this paper can bring visual economic benefit and social effect for the power plant.
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