Table of Content

25 February 2016, Volume 38 Issue 2

Previous Issue    Next Issue

Solution study of 1000MW boiler side water wall high temperature corrosion

WEI Daojun

2016, 38(2):  1-5. 

Asbtract ( 342 )  

Related Articles | Metrics

Abstract:After analyzing Huadian Laizhou Power Plant Company Limited No.2 boiler water wall high temperature corrosion causes,the plan of to provide side wind on the both side of furnace to reduce and prevent reducing atmosphere and high temperature corrosion on side water wall was claimed.After reconstruction,cheek damper opening test was carried out.Based the test result,the advantaged and notes of reconstruction plan were summarized.

Boiler depth reduce flue gas temperature the influence of low temperature corrosion resistant material

DUAN Junzhai1, ZHANG Wenpeng1, LI Zhongjiang2

2016, 38(2):  6-8. 

Asbtract ( 258 )  

Related Articles | Metrics

Abstract:In response to the call of the national energy saving, it has been important corrective measures for many domestic power plants to reduce boiler flue gas temperature and recycle waste heat,whereby low temperature corrosion resistant materials are put forward higher requirements.Regarding this situation,studies are conducted on several low temperature corrosion resistant materials.The results show that Teflon tubing and ZS1041 anti corrosion coating are suitable low temperature corrosion resistant materials with good corrosion resistance.They are appropriate for power plant boiler flue gas heat recovery,which can achieve energy conservation requirements to a greater extent and improve the overall economic benefits of the plant.

 

 

 

Causes for corrosion and its treatment scheme of the heating surfaces in furnace of the 1000MW power plant

SONG Kai, YUAN He, YOU Kunkun

2016, 38(2):  9-10. 

Asbtract ( 328 )  

Related Articles | Metrics

Abstract:Under the condition of the high temperature and high pressure,the water cooling membrane walls are apt to corrosion and leakage on the heating surface of them.it was the high temperature corrosion that made the pipe walls reduced,which caused the pipe wall couldn’t resist the pressure and the burst happened.The cause for the corrosion of the pipes was analyzed in this paper.Accordingly,the combustion modes,the coal qualities and boiler improvements were improved.After the improvements above, the leakage of the membrane walls were greatly reduced.

Testing research of double D445 control mode for ship lift communication synchronization

LIU Bingfeng1,QIN Wenyu2

2016, 38(2):  11-13. 

Asbtract ( 225 )  

Related Articles | Metrics

Abstract:Ship lift for Three gorges have the characteristics of huge tonnage,high lift hight,changeable upstream and downstream,and with the
world hardest technology and biggest scale.Based on the alignment experiment in the ship lift plant,and the method of add a coordinator control module between AB’s PLC and Siemens’s variable frequency gearing.The experimental data shows this method greatly enhanced synchronization performance among each suspension point.

Experimental study on 300MW boiler slagging and high cold state fly ash in dynamic field

WANG Chengliang, JIANG Shitao

2016, 38(2):  14-17. 

Asbtract ( 204 )  

Related Articles | Metrics

Abstract:After a low nitrogen combustion transformation on a certain meagre coal fired power plant,a few problems had come out,such as heating surface of combustion zone is slagging and highly corroded by high temperature,and the content of combustible matter in fly ash is high.In order to control the dynamic field inside furnace,a dynamic field experiment had been conducted under a high cold state,which included three layers of powder blast ring diameter test,variable secondary air volume test and independent wind pressure and vane test. Based on the analysis of test data,the main reason for these problems is determined basically,which brings proposed governance and operation adjustment.

Optimum capacity test of grooming fan for 350MW unit air preheater

CHEN Hui, HUANG Qilong, DAI Weibao, TONG Shiwei

2016, 38(2):  18-19. 

Asbtract ( 226 )  

Related Articles | Metrics

Abstract:A certain air preheater of power plant is adopting a combination of mechanical seal and grooming fan seal.Under the real operating
situation,a optimum capacity test of grooming fan under 190MW was conducted to test its boiler efficiency,air leakage rate of air preheater,power consumption of fan,power supply coal consumption and the cost of coal at different frequencies.The test shows that
under 190MW,the best frequency conversion of air preheater of grooming fan is 47Hz,which can save 48000 yuan for the unit.

Design and application of rotary trash remover of Jiuligou Hydraulic Power Plant

WANG Yanjun, YANG Jian, TANG Juanjuan, ZHANG Shaoqing, ZHANG Lubin

2016, 38(2):  20-23. 

Asbtract ( 241 )  

Related Articles | Metrics

Abstract:Due to the blockage of trash screen of Jiuligou Hydraulic Power Plant,rotary trash remover was selected as trash removal equipment.This paper introduced the layout,structure and specifications of the rotary trash remover applied in Jiuligou Hydraulic Power Plant.After installation,flow condition was improved,unit efficiency and generation capacity were increased.The author also included treatments and improvement advises to problem of trash removers,which can be referred for similar hydraulic power plant trash remover design or improvement.

The condensate polishing control system based on Citect and PLC

SUN Xiaolin1,QIN Haishan1,YIN Zhishan2

2016, 38(2):  24-26. 

Asbtract ( 245 )  

Related Articles | Metrics

Abstract:The condensate polishing treatment is an important measure to ensure the quality of boiler feed water in power plant.The control system was designed to ensure condensate polishing equipment safety and stable running.The system adopts Schneider Modicon Quantum PLC and PC monitoring software Vijeo Citect to finish the whole production process of fine treatment system monitoring,production process parameters setting, accident alarm,trend analysis and report generation,and other functions.The rationality and reliability of the control system is verified by the actual operation in the field.

Diagnostic analysis of 150MW stream turbine thrust pad oil catch rubbing

HE Donghui, ZHAO Yizhou

2016, 38(2):  27-30. 

Asbtract ( 353 )  

Related Articles | Metrics

Abstract:Based on the major accident of a 150MW power plant’s thrust pad oil catch leakage caused fire,and serious aptitude of No.2 bearing bush while starting commissioning,the author analyzed the vibration spectrum,and indicated that the direct cause is the improper space between thrust pad oil catch and journal,and caused abrasion and fire.Based on the analysis,this paper also included the treatment
measures and eliminated the potential failure.

Adjustment of supports and hangers in the four primary pipelines and its piping stress analysis for a certain 330MW power unit

FAN Aibing

2016, 38(2):  31-34. 

Asbtract ( 244 )  

Related Articles | Metrics

Abstract:This paper introduced the operation state and its fault condition of supports and hangers in the four primary pipelines for a certain
No.6 power unit,and made a piping stress check for the four primary pipelines using CAESARⅡ software.According to the results of stress calculation and on site inspection,this paper proposed a scientific and reasonable adjustment scheme and put it into practice.After that,some suggestions were put forward for the operation supervision of supports and hangers.

On line replacement of valve servo valve and the analysis of the servo valve jam of 600MW steam turbine

ZHANG Xuehai

2016, 38(2):  35-38. 

Asbtract ( 376 )  

Related Articles | Metrics

Abstract:As for the jam fault of the servo valve of the 600MW steam turbine,three online replacements scheme were put forward.compared with each other,the minimum risk scheme was selected ultimately.The measures were taken at the time of changing the medium pressure servo valve.At the same time,the reasons for the servo valve jam were analyzed,and the relevant measures were put forward.

Cause analysis of a high voltage motor bearing damage accident

MA Yonghui, ZOU Xingguang

2016, 38(2):  39-40. 

Asbtract ( 247 )  

Related Articles | Metrics

Abstract:Based on the analysis of boiler secondary air fan motor bearing damage accident,accident cause was determined as shaft current generated by motor.This paper analyzed the cause of shaft current and the damage of bearing.After change the nondriving end shield to
isolated shield,hidden danger was eliminated.

Optimization of feedwater control system for 1050MW ultrasupercritical power unit

WU Ludong, ZHANG Xiaodong

2016, 38(2):  41-43. 

Asbtract ( 218 )  

Related Articles | Metrics

Abstract:In order to improve the automatic control level,some feedwater control strategy optimization measures were adopted for the 1050MW ultra supercritical power unit of Huadian Laizhou Power Generation Company Limited,such as changing the feedwater control strategy to coal dominated strategy,controlling the coal water ratio by adjusting the fuel and water supply,adding superheat control circuit, and adding boiler combustion simulation circuit for feedwater flow setpoint,etc.After the feedwater control strategy optimization,the result of steady load test shows that the operating indicators ofimportant parameters related to the power unit are qualified,which improves the quality of coordination control and contributes to the energy saving and cost reducing.

DCS reconstruction of boiler side sequence control and logic optimization

ZHAO Na1,ZHANG Zhenwei2

2016, 38(2):  44-47. 

Asbtract ( 247 )  

Related Articles | Metrics

Abstract:This paper describes the Tianjin Huaneng Yangliuqing thermoelectric Corporation Limited.three No.5 unit dispersed control system
(DCS) transformation of the latter,debugging process,The boiler side sequence control logic system (SCS) to optimize the process.(this paper)To early to SCS in different stages of the design,configuration and debugging of the main problems are analyzed,and in view of the defects of the original design logic proposed the solution.After optimization of SCS runs smoothly,the interlock protection action of unit is more accurate and reliable.

Cause analysis and treatment of 1000MW ultra supercritical boiler water wall leakage

DONG Hongnian

2016, 38(2):  48-52. 

Asbtract ( 335 )  

Related Articles | Metrics

Abstract:From the structure,design,piping,performance,operation and other aspects,this paper analyzed a power plant’s boiler front wall water wall leakage accident.And indicated that the main causes of this accident are water wall abnormal expansion,improper welding process,water wall over pressure due to structure design and thermal stress while operation.This paper also included treatment measures.

Tetralogy of management mode and application of precise point detection

CAO Jingfang

2016, 38(2):  53-54. 

Asbtract ( 238 )  

Related Articles | Metrics

Abstract:Precise point detection is a technological base of power plant conducting point inspection and regular repair management.This paper introduces a tetralogy of management by periodic detection,signs warning,abnormal tracking and improvement and promotion,which could effectively accelerate lean management of precise point detection,maximum its function and increase the reliability of equipment.

Abstract:To guarantee the stability and operation safety of power grid,on load test of new equipment shall be carried out before put into operation.After test on capacitor,electric reactor,cable and transformer,angle of attack charter of voltage,current and load flow value was drafted.After analyzing test results,the causes of change of current,voltage and phase was indicated.

HE Liping1,LI Chunliang1,HUANG Zuwei1,CAI Zhaoyu1,ZHOU Zhiqin2,YIN Hao2

2016, 38(2):  55-58. 

Asbtract ( 270 )  

Related Articles | Metrics

Abstract:To guarantee the stability and operation safety of power grid,on load test of new equipment shall be carried out before put into operation.After test on capacitor,electric reactor,cable and transformer,angle of attack charter of voltage,current and load flow value was drafted.After analyzing test results,the causes of change of current,voltage and phase was indicated.

Analysis of high temperature resistance and shaft current reconstruction of bearings for large AC motor

CHEN Yonglong

2016, 38(2):  59-60. 

Asbtract ( 232 )  

Related Articles | Metrics

Abstract:There often happened the high temperature,abnormal sound and the damage in the large AC motor shaft during the operation,which affected the normal operation of the power unit.The causes for the hidden dangers were analyzed and the measures that prevented the shaft from the high temperature and the axis current formation were taken.The results showed that these reform measures achieved a good effect in the practical application.

MS9001E gas turbine hydraulic oil system optimization

XIANG Jianwei

2016, 38(2):  61-62. 

Asbtract ( 252 )  

Related Articles | Metrics

Abstract:This paper introduces the composition and function of MS9001E gas turbine oil system,in order to improve the quality of hydraulic oil,The original hydraulic oil system is transformed into an independent unit.Discusses the reform scheme,analyzes the transformation effect,believe that the transformation of the hydraulic oil system can ensure the safe and reliable operation of the unit.

Full automatic processing scheme for recirculating cooling water of coal fired power plant

ZHANG Zhiguo, LAN Meng

2016, 38(2):  63-64. 

Asbtract ( 285 )  

Related Articles | Metrics

Abstract:For the problems that existed in the conventional circulating cooling water treatment technology of coal fired power plant,such as poor dosing accuracy,delayed water quality analysis and monitoring,and unstable concentration ratio,etc.This paper proposed a full automatic processing scheme for recirculating cooling water,which could realize theauto additionof anti scale corrosion inhibitor and bactericide,autocontrol ofthe cooling waterblowdown,online monitoring of the pH,corrosion rateof metal, turbidity,fouling resistance,fouling deposition rate,adding quantity of water and drugs,etc.In addition,the scheme also could make a predictionbefore problem occurs and deal with the problem in time.In short,the realization of full automatic process of recirculating cooling water improves the operation security of recirculating cooling water system, saves water,reducesoperation costsand promotes operation management efficiency.

Researches on the technology of the flue gas ultra clean emission of the coal fired plant

DENG Huipeng

2016, 38(2):  65-67. 

Asbtract ( 201 )  

Related Articles | Metrics

Abstract:with the more and more strictly requirements for the discharge of the pollutants,the coal fired plants were carrying out a large scale flue gas ultra clean emission actions.At present,there were three mainly current streamline emission technology schemes.In this paper,the 3 schemes were expounded respectively and their characteristics were analyzed,which provided the references for selection of the technology to the flue gas ultra clean emissions.

Application of transformation technology of gapacity increase of single tower for desulfuration of 600MW high sulphur coal unit

ZHOU Qiang, XIAO Guilin

2016, 38(2):  68-71. 

Asbtract ( 283 )  

Related Articles | Metrics

Abstract:Take capacity expansion reformation of flue gas desulphurization system of a certain 600MW unit as an example,this paper introduces comparison and selection of capacity expansion reformation of desulphurization in the high sulphur district in order to adapt to the change of sulfur content rate in coal and national emissions requirements.This paper also analysis the implementation of the original desulphurization system,which brings reference value to similar plant transformation.

The influence of haze on the compressor inlet filter life

LIU Jinliang, LIU Zhihui

2016, 38(2):  72-73. 

Asbtract ( 198 )  

Related Articles | Metrics

Abstract:The haze weather is one kind of air pollution,especially PM2.5 was found to be the culprit behind the haze.The micro particles block the inlet air filtering system of gas turbine compressor,the inlet air filtering system pressure increased,the unit efficiency decreased,and even threat to the safe operation of the unit.In order to find out the influence of haze on the compressor inlet filter life,through analyzing data to find out a set of theory to monitor the compressor inlet filter life.

Cause analysis of deviation of on line NOx mass concentration measurement for large scale thermal power plant

SHU Maolong

2016, 38(2):  74-76. 

Asbtract ( 201 )  

Related Articles | Metrics

Abstract:The problem of NOx mass concentration online measurement value deviation is very common in large scale fire power plants.Based on caused analysis,NOx mass concentration distribution test,and analysis of instrument accuracy and measure points layout plan,improvement plan was indicated.