Table of Content

25 August 2017, Volume 39 Issue 8

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Island model V/f controlled micro grid system study

MENG Jie, DING Quan, HUANG Chao

2017, 39(8):  1-5. 

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This paper introduced leadacid battery classic first order model and topological structure of charging and discharging circuit. Control method of bidirectional converter under active and positive power source and V/f source accumulation system was studied. Base on the incident of micro grid failure caused by V/f source overcharged, a stable state of charge (SOC) control strategy based on island mode was indicated. Which is keeping low rate charge and discharge by controlling the SOC to slightly fluctuate around threshold. The simulation on EMTDC/PSCAD software proved the effectiveness. This strategy provided a solution for the stability of micro grid under island mode.

Application of variable PID parameter in power plant automatic generation control

YANG Damao

2017, 39(8):  6-9. 

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Huaneng International Power Development Company Tongchuan Zhaojin Power Plant’s 2×600MW unit main steam pressure seriously surged while increasing load in automatic generation control (AGC) mode. In order to increase the quality of coordinated control of unit，proportion integration and differentiation (PID) parameter module was designed, and properly setting proportional gain and integral time, rapidly increase or decrease load was ensured. And main steam pressure deviation was controlled in allowed range.

ARM structure based localized protection device research and application

ZHANG Wen, CHEN Qianglin, XU Dongpo, LI Haiyao

2017, 39(8):  10-12. 

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Intelligent substation localization requires uniformed interface. By integrated design, functions of multiple cards were integrated into a single chip. This required more powerful calculating ability. The process chip based on ARM structure is low power consumption and fast speed, which satisfied the requirement of localized devices. This paper introduced the ARM chip to realize the design and application of localized relay protection device. Based on the IEC 61850 modeling method, a simulation and test system was developed to test the functions and performance of localized devices.

Corrosion status investigation and prevention measures of low pressure evaporator in a heat recovery boiler of gas power plant

LI Xiaohui1, SHI Yan1, QIU Zhibin1, ZHANG Jinwen1, GUO Yanjun1, WANG Xinghe2

2017, 39(8):  13-16. 

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In this paper, running conditions and main failure modes of low pressure evaporators in heat recovery boilers of several gas power plants of Huadian Corporation were investigated. The result shows that flow accelerated corrosion (FAC) is the main reason of tube leakage in low pressure evaporators. After that, this paper expounded the corrosion mechanism and its influencing factors of FAC, and proposed some countermeasures from the aspects of design, material selection, operation and maintenance, etc.

Experimental study on multisource industrial steam supply of condensing power unit

CHEN Jian1, LUO Haihua2, YING Jianding1, ZHOU Renmi2

2017, 39(8):  17-20. 

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This paper introduced the steam extraction transformation scheme of reheat steam and main steam lines for a homemade 300MW condensing power unit, and through theoretical calculation and experiment, it acquired the extraction flows at low and high temperature parts of reheating pipe under different load conditions for every unit. The study showed that through multisource industrial steam supply transformation of 300MW condensing power unit, it realized the maximum heat supply of 1.5MPa industrial steam per unit up to 170t/h, which provided a reference for the heating transformations of other 300MW condensing power units, such as Alstom and Dongfang.

Addition dosage calculation of secondloop system for AP1000 nuclear power unit

MA Xianqi, XU Wujun, PAN Ronghui

2017, 39(8):  21-23. 

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Taking the AP1000 nuclear power unit as an example, this paper calculated the addition dosage of secondloop system in operation mode and shutdown mode of condensate polishing system (CPS), and obtained the theoretical add amounts of ammonia and hydrazine when the unit is running, which provided a reference for the dosing system design and configuration of secondloop of AP1000 nuclear power unit.

Power and heat plant absorption pump circulating water waste heat utilization technology and application

WANG Tieshan

2017, 39(8):  24-25. 

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Heat pump circulating technology and power and heat plant circulating water waste heat utilization was introduced. Absorption pump could use cold source heat loss for urban heat supply. System solved existing problems of power and heat plant centralized heat supply. Take a thermal power plant’s 4×200MW unit in Hebei Province as example, after applied absorption heat pump, heat supply increased by 300GJ/h, annual coal consumption reduced by 34000t. Emission of CO2，SO2, NOx and flow gas effectively reduced. Social benefits and economic benefits are outstanding. 

Conducting glass fiber reinforced plastics positive electrode maintenance exchange method for nonshell wet type precipitator

ZHOU Ping, YANG Pengfei, FAN Chunyang, LIU Huidong

2017, 39(8):  26-28. 

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Postdesulfurizationsaturated wet flue gas ion corrosivity. Common anticorrosion material in China is glass flake or glass fiber reinforced plastics, which are affected by lifetime and installation quality. Electrosparkiscommon while wet precipitator operating. Which caused carbonization at anode or anode breakdown. The nonshell wet type precipitator, independently developed by China Huadian Engineering Company Limited, provided solution for anode support beam, and indicated an anode maintenance method.

Direct air cooling system noise analysis and estimation

CUI Chao

2017, 39(8):  29-31. 

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Noise of direct air cooling system mainly consists of fan group aerodynamic noise and is mainly from dipole. Air cooling island fluid field simulation and noise estimation was carried out based on Fluent acoustics module. Which indicated that Fluent effectively simulated fluid field. To improve environmental influence from direct air cooling system, lowering low frequency noise could be considered. 

Reason analysis and prevention measures of inner wall corrosion of a boiler lowtemperature reheater

WANG Fengping, LI Jian, ZHAO Aimin

2017, 39(8):  32-35. 

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For the 330MW subcritical boiler of a certain power plant, two leakage accidents occurred due to the inner wall corrosion of platen reheater and wall type reheater. Combining with the tube cutting inspection on site, sediment test and analysis reports of metallographic and mechanical properties, this paper analyzed the corrosion reason of lowtemperature reheater from the aspects of chemical water treatment, operations of boiler startup and shutdown, etc. After that, it proposed the treatment scheme on site and corresponding anticorrosion measurements.

Failure analysis of air preheater of 350MW supercritical unit

WANG Lin1, CHEN Suoqun2, GUO Sanhu1, LI Wenjun1, ZHANG Yafu1,WANG Hongyu1

2017, 39(8):  36-38. 

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Based on Jiantou Chengde Power and Heat Company Limited 350MW unit, cause of rotary air preheater main shaft stalling failure was analyzed. After internal inspection and flue gas temperature curve analysis, air preheater rotatable parts were conformed function properly. Combined with motor current trend before and after failure, the main cause was determined as transmission part failure. After reducer disassemble inspection, it was found that final drive gear bearing inner race fracture, retainer damage and transmission lost. After changing failed bearing, air preheater returned to normal. Combined with monitoring data, the failure process was reproduced. Preventive advices were provided.

Supercritical unit no pump startup reconstruction analysis

CHEN Yu

2017, 39(8):  39-41. 

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Supercritical unit no startup circulating pump system and circulating pump startup system was introduced and compared. Based on a reconstruction of 350MW supercritical unit startup system, approach and scope of nopump start construction was introduced. Which could be referred by similar reconstruction.

The analysis of condenser vacuum measurement transformation for 600MW supercritical thermal power unit

LIU Longxiang

2017, 39(8):  39-41. 

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Taking Fujian Huadian Kemen Power Generation Company Limited, vacuum sampling measurement system in the background of the problems existing in the actual operation, combined with the actual analysis of the reasons. In view of the condenser vacuum measurement system and improvement measures are proposed to improve, effectively improve the accuracy of the condenser vacuum measurement, obtain good actual effect.

A M701DA type gas-steam combined cycle unit IGV open value improving adjustment

WANG Caiwen

2017, 39(8):  44-47. 

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Based on the problem of a M701DA type gas-steam combined cycle unit exhuast temperature deviated from base value in certain load ranges, and deviated from waste heat boiler optimum design temerature, control logic of compressor inlet guide vent (IGV) was analyzed. The adjustment measurement of IGV was indicated. Turbine exhaust temperature was increased. The objective of to reduced gas turbine generating gas consumption was achieved.

BHW35 boiler longitudinal and circumferential weld defect analysis and control

ZHOU Liping

2017, 39(8):  48-49. 

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BHW35 steel has notable hardened trend, and cold cracked easily. The treatment of preheat and postweld hydrogen remove was indicated. After analyzing a company's boiler drum longitudinal and circumferential weld, it was proved that proper welding process is essential for defectfree joint.

A type of control oil cooling circuit reconstruction plan and analysis

WANG Dawei

2017, 39(8):  50-52. 

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Based on the problem of control oil abnormal high temperature of Jiangsu Huadian Qishuyan Generation Company Limited, maintenance crew inspected and analyzed the cooling circuit and indicated reconstruction plan accordingly. After reconstruction, unit safety was remarkable enhanced.

Vietnam Duyen Hai 3 Thermal Power Plant unit No.1 vibration analysis and treatment

HUA Zhaojie

2017, 39(8):  53-54. 

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The generating unit of Vietnam Duyen Hai 3 Thermal Power Plant was overvibrating in noload and normal operating condition. Especially in generator temperaturerise test, the vibration value varied with variation of exciting value. After analysis, unit vibration was mainly caused by rotor imbalance. By site balance adjustment, the problem of overvibration was effectively solved.

Turbine supervisory instrument axial displacement signal abnormal cause analysis and treatment

LIU Yafeng, DU Jianchuan, WANG Jiqiang

2017, 39(8):  55-57. 

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Based on turbine supervisory instrument (TSI) axial displacement survey point deviation, periodic fluctuation and other problems after installation, by analyzing abnormal signal, reconstruction plan was indicated accordingly. Accuracy of unit important survey point was ensued.Reliability of thermal process protection was enhanced.

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WANG Dongya, SHEN Wenhua, CHEN Guanming

2017, 39(8):  58-60. 

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1000MW unit condensate pump vibration cause analysis and treatment

ZHU Deqiang, WANG Hui

2017, 39(8):  61-63. 

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The problem of Chaozhou Power Plant 1000MW unit condensate pump overvibration in certain speed range after changing from power frequency to frequency conversion was introduced. Causation was analyzed. After inspection measueremnts, vibrating amplitude was effectively reduced. This plan is simaple and reliable. Which ensured the safety and reliability of condensate pump longterm operation.

A gasfired distributed energy station environment evaluation analysis

JIANG Dongqiao1, SUN Xiaoxu2, KONG Fei2, LIU Yubin2, LIU Jie2

2017, 39(8):  64-66. 

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Take the distributed energy station reconstruction project in Shanghai as an example, the distributed energy system pollutant emission varying trend was studied. Based on the distributed energy system environmental benefits evaluation model, the environmental benefits and cost of distributed energy system and traditional coalfired power was analyzed. The study result indicated that, compared with traditional power plant, the environmental index of distributed energy system is significantly higher. Environmental cost of distributed energy system is only onethirteenth of traditional coalfired power plant. Quantitatively analyzing distributed energy system is not only providing environmental data for control system improvement, but also providing data for the development of distributed energy system.

Power plant wet desulfurization tower bottom abnormal scaling analyzing and treatment measurements

YANG Junqiang, XUE Mingchao, YANG Xiaofei, TIAN Wenhui

2017, 39(8):  67-69. 

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A power plant has two units of 330MW subcritical coalfired units, and adopted gypsumlimestone wet type flue gas desulfurization system. Desulfurization system was equipped for each boiler and with one stacker. Abnormal scaling was found in desulfurization system operating. Base on this problem, analysis was carried out, and treatment measurements was indicated. Which is critical for the unit safety, reliability and economic.

Cause analysis and solution of slag accumulation at tail end of scraper slag salvaging machine

HE Zhongcai

2017, 39(8):  70-71. 

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Slag quantity was significantly increased due to worse coal quality, and caused more and more slag accumulation at tail end of scarper slag salvaging machine. By adding spray system, adding tension shaft sleeve, changing slag curtain material and other measurements, unit safety and stability was enhanced, zero nonemergency stop was realized.

Waste heat boiler flow accelerated corrosion cause analysis and prevention treatment

LU Dingkang, PAN Hao

2017, 39(8):  72-73. 

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Waste heat boiler flow accelerated corrosion cause was briefly analyzed. Prevention treatment for boiler heat surface leakage was indicated. Which could be referred for waste heat boiler application and maintenance.

Power plant highly suspended and high hardness circulating water sewage reusing technology analysis

CUI Desheng1, LI Wenjie1, GONG Longfei2

2017, 39(8):  74-76. 

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This paper introduced the process of a power plant in Inner Mongolia applied coagulation and clarification, immersed ultra-filtration and hyperfiltration to reuse high suspended and high hardness circulating water as circulating water system and boiler feedwater. The technical feature, economic benefits and environmental benefits was analyzed.