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中文
Table of Content
25 March 2015, Volume 37 Issue 3
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Performance testing and economy evaluation of induced draft fan transition to turbinedriven mode
DU Yaqin1，YANG Xueping1，WANG Yin2
2015, 37(3): 1-4.
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Abstract:After installing denitration equipment to a super critical 630MW unit of a power plant, resistance in airgas system was increased. Therefore, the induced draft fan got transformed form motordriven mode to steam driven mode. The paper introduced smallscale turbine thermal cycle system of reformed induced draft fan and the respective performance experiment, analyzed the internal efficiency of small turbine under different load levels. After the reformation, the whole system is sable and safe, with working capability enhanced. In this way, the electricity and coal consumption of the plant can be largely reduced, while the grid power and annual revenue will rise.
Reformation of merging induced draft fan and booster fan in one for a 600MW unit
WANG Shouyang
2015, 37(3): 5-6.
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Abstract:In Hunan Huadian Changsha Power Generation Company Limited, in order to improve the fan operation efficiency, to reduce the fan’s power consumption and to reduce the maintenance cost, the reformation of merging the boiler induced draft fan and the desulphurization booster fan in one was carried out. The concrete content of the reformation was introduced. The hot test after reformation shows that the new induced draft fan can operate safely and stably under various conditions, and the station service power consumption rate was reduced greatly.
Control strategy of booster fan of 680MW unit after flue gas bypass was cancelled
TAO Liwei
2015, 37(3): 7-9.
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Abstract:Taking the 2×680MW ultra supercritical unit as example, the operation mode of the booster fan and the induced draft fan after the flue gas bypass was cancelled was introduced. The influence of operation stability of the booster fan on operation reliability of the unit was expounded. The optimized control strategy was given, and the stable operation of the unit was ensured.
Application of improved entropy fuzzy clustering in power plant desulfurization system
YANG Guobin1, XIE Xiangyang1, XIE Yafei2
2015, 37(3): 10-13.
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Abstract:Limestonegypsum wet FGD technology, lime or limestone as the desulfurizer, is mainly affected by raw limestone, unit’s running parameters and adjustable parameters. After reduction of the parameters, constrain adjustable parameters as slurry density, the pH value of the slurry and the calcium to sulfur ratio (Ca/S) within the optimal range of values, and the factors affecting the desulfurization efficiency are concluded as unit load, inlet SO2 concentration and slurry pump operating units. Threshold variable metric entropy fuzzy clustering (EFC) algorithm is proposed on base of the basic EFC, and its reliability is verified. The proposed algorithm is used for multiparameters’clustering on actual data within several typical load neighborhoods, to dig out the relationship between the inlet SO2 concentration, slurry pumps and the desulfurization efficiency according to different loads, furthermore, propose slurry circulating pump optimization scheduling scheme.
Analysis on factors influencing on economic efficiency of natural gas power generation
LIU Zhanli
2015, 37(3): 14-17.
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Abstract:Under the impact of the natural gas price, the feedin tariff and other factors, the natural gas power generation has not sufficient competitiveness. In our country, the current ongrid price of the gas power generation is the temporary ongrid price, which does not reflect the scarce resource, the environmental value and other external costs. The influences of the natural gas price and annual utilization hours on the economic efficiency of gas power generation were analyzed. Considering the peakvalley timeofuse power price and the environment value, the economic benefit of the gas power generation and the benefit of coalfired power generation were compared. Based on a guess and estimate, the rational grid purchase price of the gas power generation was put forward, which provides a reference for development of the gas power generation industry.
Study on blockage prevention technology for rotative air preheater of boiler
WANG Chengliang
2015, 37(3): 18-21.
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Abstract:There were serious ash deposition and blockage in the rotative air preheater of large thermal power units, and the heat exchange efficiency of the air preheater was reduced, the ventilation resistance was increased. In extreme case, the unit may be compelled to reduce the output. Based on research of the mechanisms of the ash deposition and the blockage of the air preheater, some preventive measures were proposed, which include to optimize the ammonia escape measurement system, to optimize the operation mode of the ammonia injection system, to reform the soot blowing system, to optimize operation mode of the soot blowing system, to optimize operation mode of steam air heater, to adopt corrosionresistant material for the lowtemperature heating surface and so on. The safe and economical operation of the unit was ensured.
Influence of working condition variation of air cooling system on the turbine output power of 600MW unit
YU Yao1, WANG Li1, ZHANG Yijiang1, GUO Minchen2, LI Meibao2
2015, 37(3): 22-25.
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Abstract:The variation of working condition of aircooling system in direct aircooling unit can impact on the exhaust steam pressure and then impact on the unit output power. According to the structure parameters and the operation parameters of the 600MW supercritical direct aircooled unit of a power plant, using the ηNTU method, a mathematic model of aircooling system working condition variation analysis was established. The variation rules of the exhaust steam pressure depending on the inlet air temperature, the exhaust steam heat load and the face air velocity were analyzed respectively. The influences of above factors on the unit output power were analyzed too. According to the influencing rules, the adjustment strategy of the speed and the air volume of the air fan was proposed, which provides a theoretical reference for improving the operation efficiency of the aircooled unit.
Finite element analysis on translation of steel support of induced draft fan in thermal power unit
SUN Yewen1, CAI Dongsheng2, ZHUANG Haiqing1, XU Zhibo1
2015, 37(3): 26-28.
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Abstract:The strength and rigidity finite element analysis for induced draft fan support translation project of the thermal power unit of Guodian Changzhou Thermal Power Plant was carried out, and multiple schemes and multiple conditions were considered in the analysis. The result in this paper provides a theoretical basis for induced draft fan support translation project. The practice verifies that using the translation scheme of this paper, the construction period can be shortened effectively, and the investment can be reduced.
Identification method of address overlap of IO modules in DCS process control station
WU Shenghua, TIAN Haibo, WANG Danlin
2015, 37(3): 29-30.
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Abstract:A practical circuit was introduced, which can be used to monitor the address overlap error of IO modules in distributed control system (DCS) process control station. The circuit principle was analyzed and verified by experiment. The verification result shows that the operation effect of the circuit is favorable.
Reformation of multistage water seal device for return water of feed pump sealing water
HONG Li, WANG Xiaowen
2015, 37(3): 31-33.
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Abstract:The working principle of multistage water seal device for return water of the turbofeed pump sealing water in the 1000MW supercritical unit of Huilai Power Plant was introduced. The problems existing in design, installation and operation of the multistage water seal device were analyzed. A feasible reform scheme is developed and implemented. The longstanding problem of return water recovery of feed pump sealing water was solved.
Analysis on reasons of lowering of condenser vacuum degree and diagnosis method
WANG Gang
2015, 37(3): 34-37.
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Abstract:The parameters reflecting the condenser operation conditions were introduced. The influencing factors, which cause the condenser vacuum degree to lower, were analyzed, and the diagnosis basis of the factors was explained. The diagnosis method of vacuum degree lowering in normal unit operation was illustrated by practical example, and the concepts of extreme vacuum degree and optimal vacuum degree were put forward. The results in this paper can be used as reference for economical operation of steam turbine unit.
Analysis on economic benefit of reformation of permanent magnet speed controller of closed water pump in a power plant
ZHAO Yong1, ZHANG Chunjie1, WANG Gang1, YANG Jinfa1, ZHOU Liping2, LI Wenwu3
2015, 37(3): 38-41.
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Abstract:The flow and the pressure of the closed water pump are usually adjusted by valve, but this causes large amount of energy waste. The permanent magnetic speed control and the variable frequency speed control are oftenused water pump speed control technologies, and the energy conservation effects of the two methods are roughly equal. Considering from the angle of longtime operation, the economic benefit of the permanent magnetic speed controller reformation is lager than the frequency converter, and the system reliability can be improved. So, in energysaving speedcontrol reformation of the closed water pump in Huadian International Laizhou Power Plant, the permanent magnetic speed controller was selected to control of the flow and the pressure of the pump and to reduce the energy consumption. After the reformation, the closed water pump operated more stably, the power consumption was reduced obviously, and the expected effect was achieved.
Features of transition section arrangement of tubular belt conveyer
WANG Huijun
2015, 37(3): 42-43.
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Abstract:The transition section is an important part of the tubular belt conveyer. General arrangement of the transition section of the tubular belt conveyer was introduced. The structural style and the control points of the tubular belt conveyer were analyzed. After the transition section of the tubular belt conveyer was optimized, the reliability of the tubular belt conveyer was improved.
Features of capacity air dampers with multipleblade and single blade and operation analysis
LI Youxin1, ZHANG Yingshuai2, LI Chengshuai1
2015, 37(3): 44-46.
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Abstract:The control features of air damper of doubleended coal mill were introduced. Under cold stat, the test of the damper opening and air flow test for the multipleblade air damper and the single blade air damper were carried out. The air flow features of the two air dampers and their influences on hot state operation were compared. Some targeted suggestions were given.
Cleaning methods of circulating water system of indirect aircooled unit
GAO Yun, CHEN Yunfeng, LIU Lei, YUAN Long
2015, 37(3): 47-48.
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Abstract:The indirect aircooling tower is more and more widely used in power plant cooling systems. Before the unit is put into operation, the circulating water tank and piping system must be cleaned, and there is not relevant specification on this yet. Combining with engineering practice, taking a 660MW indirect aircooled unit as example, the cleaning methods of the circulating water pipes and tanks of indirect aircooling system were expounded, which can be used as reference for indirect aircooling system in construction and debugging of circulating water system.
Application of low temperature economizer on 30MW unit
QI Linhu1, HUANG Xinyuan2, GUO Feng1
2015, 37(3): 49-51.
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Abstract:In a 30MW thermal power plant of China Huaneng Group, boilers’ flue gas temperature is overhigh, undermining boilers and electric dust collector efficiency. By installing low temperature fuel economizer body between the air preheater s outlet and the precipitator’s intake, and heating the drain tank with boiler waste heat to replenish water, flue gas temperature around the precipitator intake can be reduced, so can the unit economy and dust collector efficiency. After the application of system, flue temperature around the precipitator inlet has been successfully maintained between 90～95℃, and precipitator efficiency greatly improved.
Calculation of length of thermal insulating pipeline for steam pressure measurement
ZHOU Xiaofeng, PENG Bin
2015, 37(3): 52-53.
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Abstract:How to ensure the thermal insulating pipeline for steam pressure measurement without heat tracing to do not freeze in lowtemperature environment was researched. Using the Fourier heat conducting formula, the length of thermal insulating pipeline for steam pressure measurement was calculated. The heat transmits along the sampling pipe in the pipe axial direction. At the same time, the heat radiates out through the heat insulating layer in the radial direction, which causes the temperature of the sampling pipe to lower gradually. The heat released by temperature reducing of the sampling pipeline of the steam pressure transducer is equal to the heat radiated out through the heat insulating layer. Due to that the outdoor steam pressure measurement is widely used in project construction, to adopt the heat insulating method to ensure normal operation of the instrument and the pipeline without heat tracing is of greater significance. Obviously, the investment of this method is low, and the work amount of the construction is reduced.
Analysis and treatment of cracks on hydraulic turbine runner
LIU Jiawen
2015, 37(3): 54-55.
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Abstract:The hydraulic turbine runner is important part of the hydraulic turbine. The crack defect on runner blade can influence on safe and stable operation of the hydropower station. The treatment process of the crack on the runner blade of unit No.4 of Guangdong Yudean Liuxihe Power Generation Company Limited was introduced in detail. The actual reasons of the crack were found, and the crack defect was eliminated.
Quick startup and stop strategy of oneside axial flow primary air fan of power plant
ZHANG Guobin
2015, 37(3): 56-57.
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Abstract:The harm of stall fault of axial flow primary air fan was analyzed. The quick startup and stop methods of the axial flow primary air fan were introduced in detail. The influence of the startup and stop operation on the boiler combustion can be reduced to minimun by the methods, and the safety of the unit operation can be ensured.
Analysis on exceeding standard hydrogen cation conductivity of lowpressure steam in a gassteam combined cycle unit
WANG Lihong
2015, 37(3): 58-60.
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Abstract:Taking the Zhengchangzhuang Gasfired Thermal Power project as example, aiming at the fluctuation of steam hydrogen cation conductivity of the gassteam combined cycle unit, the exceeding standard data of hydrogen cation conductivity of lowpressure steam were analyzed. The deaeration conductivity analyzer was installed, and the reasons cause the hydrogen cation conductivity to exceed standard were found. The result in this paper provides effective basis for the equipment governance.
Analysis on operation features of MPS212 medium speed mill directfired pulverizing system
WU Jianliang
2015, 37(3): 61-63.
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Abstract:Combining with practical operation of MPS212 roller mill of Huadian Liuan Power Generation Company Limited, the factors influencing on the mill operation capacity and threatening operational safety of the mill were analyzed. The relevant countermeasures were proposed. The results in this paper can be used as reference for operation of similar equipments.
Excavation quality control of rockanchored beam of underground powerhouse in Elephant Trunk Hill Hydropower Station
TANG Xianghua, GONG Rui
2015, 37(3): 64-65.
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Abstract:The general situation of the underground powerhouse project of Elephant Trunk Hill Hydropower Station and the geologic features were introduced. The quality control measures of the rockanchored beam excavation of the underground powerhouse were expounded. The construction scheme of the rockanchored beam excavation was put forward. According to the bursting test result, the rational parameters were determined. The remained halfhole rate, the flatness and the bodily form of the excavation surface meet the specification and design requirement. The conclusion of the united acceptance inspection is“excellent”.
Analysis on reasons of jam fault of steam turbine governing system and treatment measures
DING Huaigao
2015, 37(3): 66-67.
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Abstract:Some problems, such as sluggish and jam, occurred in the steam turbine governing system. The problems were analyzed, and it was confirmed that there were defects in the front bearing seat angular pin (plate) and the oil return pipe. In unit startup process, the defects can lead the front bearing seat to shift to left front direction, which will cause the rotor to be offcenter, the steam leakage in front steam seal right side to increase, and the heating expansion of the lever and support of the governing valve to be uneven. The sliding key system was adjusted, the equipment hidden danger was eliminated, and the normal operation of the unit was ensured.
Research on feasibility of applying oilfree ignition system in 600MW coalfired power plant in Vietnam
JIANG Fangshuai, YU Wenbo
2015, 37(3): 68-70.
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Abstract:The coal for Duyen Hai II Coalfired Power Plant in Vietnam is higher volatile coal, and the coal supply is relative stable. Based on analysis of the burning characteristics, the burnout characteristics and the slagging characteristics of the coal, the feasibility to apply the plasma ignition system, to cancel the fuel oil system and to construct oilfree coalfired power plant is researched. Based on estimation, after the fuel oil system was cancelled and the plasma ignition system was installed, the cost of one unit during commissioning period can be reduced by 26.5 millions Yuan.
Design of temperature control system of extruding machine of honeycomb fashion denitration catalyst
PANG Xishu
2015, 37(3): 71-72.
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Abstract:Using the programmable logic controller (PLC) as the control core; applying the fuzzy selfadaptive PID control technology, an independently operating temperature control unit was designed. The honeycomb fashion denitration catalyst extruding machine was divided into four temperature control parts, using four temperature control units, which operate independently and coordinately, the precise temperature control of the extruding machine was realized, and the product quality was improved.
Analysis on condensate pump motor of energy saving reconstruction
ZHAO Zhilong
2015, 37(3): 73-75.
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Abstract:Three energysaving reformation schemes of condensate pump, which are to replace the motor, to reduce the stages of vane wheel of the pump and to install the frequency converter, were analyzed and researched. The analysis result shows that to install frequency converter is the best energysaving scheme for the motor. The principle and the technical indexes of the frequency conversion technology were expounded, and the practical effects and the economic benefit of the frequency conversion technology in motor energysaving reformation were described.
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