Integrated Intelligent Energy

International solar energy resource and tendency of solar thermal power generation

HUANG Xiang

2009, 31(12): 1-3.

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The distribution of international solar energy resource was introduced. Three focusing solar thermal power generation modes were discoursed, and their characteristics and application ranges were explained. The vigorous development of abroad solar thermal power generation was described, and the solar thermal power generation units, already put in operation and will be constructed, were listed.

Gas-phase flow field analysis of absorption tower in active coke desulphurization installation

TANG Xishan;LIU Jing;SHI Kun

2009, 31(12): 4-7.

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Using numeric calculation method, the flow field inside rectangular crossflow bed absorption tower of active coke desulphurization installation was studied. The result indicates that the entrance structure of absorption tower has large influence on air flow distribution of intake chamber. The active coke layer has certain effect for uniform distribution of flue gas flow field. The flue gas flow in main reactive core area of bed layer is onedimension flow, and the flow field distribution is relatively uniform. The flue gas flow in material seals at top of the bed and in the base of ash hopper is twodimensions flow. And a certain amount of flue gas flows in the feed inlet. Adding diversion devices in entrance of absorption tower is helpful for optimization of flue gas flow field.

Study on flow and resistance characteristics of denitration installation using selective catalytic reduction method

LüTongbo;LI Lin;WANG Shurong;WANG Zhiqiang

2009, 31(12): 8-11.

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The flow in SCR method denitration installation of a 300MW unit was simulated numerically by using of CFD software Fluent, and the influence of the guiding devices, the ammonia injection grid and the flue gas deflection angle of reactor on the system resistance characteristics was analyzed. The research result shows that the guiding devices and rectifier devices can greatly improve the flow in the installation, and the guiding plates can optimize the flow and reduce the resistance. In the ammonia injection grid, the influence of the wear plate on reactor system resistance is smaller, and proper change of the flue gas deflection angle can reduce the resistance loss.

Feasibility analysis of eliminating of GGH in the desulphurization system

DAI Xin;QU Shuguang

2009, 31(12): 12-14.

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In the operation of domestic limestonegypsum desulphurization devices, the ash fouling and other faults often occurred which directly influenced the safety and stable operation of desulphurization equipment and could cause generation unit outage. The power plant should be severely punished by national environment protection department due to desulphurization equipment outage. By using practical examples, the feasibility and the necessity of eliminating the GGH were illustrated. Simultaneously, the problems created due to elimination of GGH were analyzed in detail, and relevant treatment measures were given.

Application of novel burner with lower NOx for pulverized coalfired boiler in largecapacity thermal power plant

ZHANG Lei;WEI Shuyin

2009, 31(12): 15-18.

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In present, the NOx emission of domestic power plant boilers exceeds the limit of standard badly, so the technical reformation of pulverized coalfired boiler for reducing NOx emission is necessary. The principle of pulverized coalfired burner with lower NOx emission was explained, the technical characteristics of five kinds of burners were analyzed, and actual application example of novel burner in thermal power plant was given. It was pointed out finally that the novel pulverized coalfired burner with lower NOx emission has composite advantages of stable combustion under low load, slagging prevention, anticorrosion in high temperature and reducing NOx emission, and is worth to be spread.

Discussion on extending service life of SCR DeNOx catalyst

SUN Haifeng;YANG Guangchun;GAO Jingyu

2009, 31(12): 19-21.

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The general operation situation of the denitration system in Hunan Huadian Changsha Power Generation Corporation Limited was introduced. The concept and significance of the catalyst service life were explained. By the deeply analysis of main factors influencing on the denitration efficiency and , particularly, of the parameters of the catalyst, the design optimization and operation optimization for denitration system catalyst reactor, maintenance overhaul and soot blowing control were researched,and their influence on catalyst service life were discussed too.The result is of practical significance to direct the denitration system operation and to reduce the system operation and maintenance cost.

Study on current detection and control of a parallel hybrid-type active power filter

HONG Zhucai;;CHEN Donghua;ZHANG Fengchu

2009, 31(12): 22-25.

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The current detection and control of parallel hybrid APF were studied. Its universal electrical model was established; the current detection method, in which the active power current was separated, was adopted; the load harmonic current control strategy was selected. Then the parallel hybrid APF was researched and designed, and a parallel hybrid APF was developed. The field application demonstrates the correctness of this research method.

Research of energysaving application of permanent magnet speed adjustment technology in thermal power plant

YAN Xinrong;ZHANG Dong

2009, 31(12): 26-28.

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The permanent magnet speed adjustment technology is advanced, reliable and energysaving motor speed adjustment technology. The principle of permanent magnet speed adjustment technology was introduced, and its performance was compared comprehensively with cascade speed control and variable frequency speed control. The application of permanent magnet speed adjustment technology in open circulating water pump of a thermal power plant and the obtained effects were discussed.

Improvement of lifting scheme for 650/100kN intake tower slewing crane

SI Jianwei

2009, 31(12): 29-31.

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The design ideas and main features of two hoisting mechanism scheme of 650kN slewing crane in intake tower of Qingjiang Shuibuya hydroproject were introduced. The hoisting mechanism of main hook and auxiliary hook of slewing crane had been improved; the original two joint reels were replaced by one double joint reel. Then the operational synchronicity of slewing crane was increased, the mechanism and structure of slewing crane were simplified, and the antioverturning stability of the gantry crane was enhanced.

Optimization of grounding grid of substation and potential distribution measurement and analysis

GENG Yaming;LU Lu

2009, 31(12): 32-34.

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The basic method of optimized design of substation grounding grid was introduced, and the selection of measurement points and the correct measurement method, which can reduce the influence of environment factors on measurement result, were introduced too. Taking an 110kV substation as example, the potential distribution was measured accurately, the measurement data were analyzed, and the more accurate experiment results were obtained. Based on the result analysis, in order to improve the potential distribution, some measures were proposed to improve the performance of the grounding grid effectively.

Design of twostage leakage detection logic for burner management system

XIE Chunwang;JIANG Nutao

2009, 31(12): 35-37.

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The design thought and basic principle of leakage detection logic of burner management system for gasfired boiler, which had been designed in accordance with the standard NFPA 852001 issued by the National Fire Protection Association of America, were introduced. The twostage detection process was used in this detection logic. It was proved by practical application that the design of the twostage leakage detection logic is rational and reliable.

Discussion on startup control strategies of 9F class singleshaft type combined cycle generating unit

QIAN Yajie;WANG Xiuyan

2009, 31(12): 38-40.

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The network frame of control system of 9F class singleshaft gassteam combined cycle generating unit was analyzed. The sequential control strategies of whole startup process, which is from startup preparation, startup, synchronization and parallel in grid, unit temperature matching control, high/middle/low pressure steam system control till full load, were discussed, and some suggestions for consummating system design were proposed.

Experimental research of circulating water treatment optimization for 300MW unit

LENG Yikang;CHENG Chunlan; XU Jingwei

2009, 31(12): 41-44.

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The open closedloop cycle system is adopted for 300MW unit circulating cooling water in Jiangsu Huadian Yangzhou Power Generation Corporation Limited.The operation mode and control parameters of its circulating cooling water treatment system are of important significance to energysaving and emission reduction of the power plant. Based on the experimental research of scaling and corrosion inhibition technology in circulating water treatment process of the power plant, the optimal control conditions suitable to the circulating water treatment process of the power plant were found, the security target of operation without scaling and corrosion was realized, the operation consumption was reduced, and the drained water quality of circulating water system was corresponded with relevant standard.

Analysis of factors influencing on thermal efficiency of heater of an introduced 300MW unit

WANG Yi;YAN Litao

2009, 31(12): 45-47.

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Combining with the requirement of unit energysaving reformation, based on the theory of equivalent enthalpy drop method, the influence of temperature difference between heater terminals and steam extraction pressure loss on the thermal efficiency of the regenerative heating system of an introduced 300MW unit was analyzed quantitatively. Aiming at the result of the quantitative analysis, the defects and problems in the regenerative heating system structure were found, and the result can be used as a foundation for optimal operation of regenerative heating system of similar units.

Influence of matching of measurement and control device D25 with CZX-12A on recloser of 220kV line

ZOU Yiyun;FENG Wei

2009, 31(12): 48-50.

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In process of abnormal situation analysis of a substation in Taizhou area, it was found that when the measurement and control device D25 manufactured by certain company was matched with line protection, in which the CZX-12A operational relay box was used, if the relay in measurement and control box acted abnormally, the automatic recloser of the line protection should be latched. In this situation, if a single phase earthing fault occurred, the switch should trip single phase, and the recloser should not recluse, so the single earthing fault may translate into multiphases short circuit fault, and the equipment damage in fault point may be enhanced. This is a hidden danger for safety operation of power grid. The abovementioned phenomenon was analyzed, and relevant improvement scheme was proposed.

Analysis of a working scheme for dismantling an oil tank with 20000m3 capacity

LI Ying

2009, 31(12): 51-53.

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A working scheme of a project for dismantling of an oil tank with 20000m3 capacity was introduced, in which the ’reversal installation method’ had been adopted. The material selection and strength checking calculation for provisional reinforcement measures in the scheme were summarized. It is expected that the result could be used as reference in similar project.

Analysis of the common faults of coupling capacitor

GU Chao;REN Chuanbao;LI Zhongyuan

2009, 31(12): 54-55.

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The common faults of coupling capacitor were analyzed; the fault reasons were found; and effective prevention measures were put forward. Then the safety operation of electric power system was ensured.

Selection of connecting method in measuringtube installation

LU Kui;LüGuohua

2009, 31(12): 56-58.

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The trip caused by the leakage and flick in the connections of measuringtubes often happened. Several connection methods commonly used in measuringtube installation were presented; the matters needing attention in selection of different measuringtube connection method were pointed out. It is expected that this paper can provide the reference for design and installation of sequent generation units.

Reason analysis and improvement of high working oil temperature of hydraulic coupling in induced draft fan and pipe vibration

SU Jingwen;ZHANG Jinbao

2009, 31(12): 59-60.

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In #3 boiler and #4 boiler of Sanhe Power Generation Corporation Limited, the speed of the induced draft fans is adjusted by hydraulic coupling. The temperature of working oil of hydraulic coupling was higher, so the furnace negative pressure control can not realize only by using the hydraulic coupling, and the combining adjustment mode of hydraulic coupling and inlet regulating damper must be adopted. In order to reduce the working oil temperature, the working oil pressure and oil flow hadbeen increased, but this caused larger pipe vibration, and the welding seam was cracked and the joint bolt was broken due to large vibration. Based on research of the operation conditions of hydraulic coupling, the bore diameter of orifice plate in oil tube was adjusted, and the support and suspension of working oil pipeline and the route of pipeline were redesigned. Then the temperature of working oil of hydraulic coupling was fallen, and the pipe vibration was weakened.

Analysis and solution of the main problems of boiler in 2×600MW orimulsion oil power plant

SONG Jinghui;LIU Qingxin

2009, 31(12): 61-63.

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The 2×600MW boiler of Zhanjiang Orimulsion Power Plant is the first boiler specially designed for burning orimulsion oil. Some problems existed in the plant, such as that the boiler can not get designed load, the ash conveying system was blocked, the air preheater was blocked and others. The reasons of these problems were analyzed, and, by research, the methods solving these problems were given.

Reformation of cooling water for waterring pump working fluid

YUAN Ning;ZHANG Shiqiang

2009, 31(12): 64-65.

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There are four 300MW condensing turbines installed in project phase I of a power generation corporation, and two 2BW4353-0 type waterring vacuum pumps were configured for each unit. The working fluid is cooled using open circulating cooling water which is introduced from condenser circulating water, and in summer its cooling effect was bad and this leads to the output of vacuum pump to be reduced and cavitation of pump wheel occurred; so that the safety and economical operation of unit had been influenced. The principle and operation characteristics of waterring vacuum pump were expounded in this paper, and the reformation scheme of vacuum pump working fluid cooling water system was put forward too.

Feasibility study of combination between power plant project and seawater desalination project in a recycling economy way

BAI Shaotong;FAN Xiaopeng

2009, 31(12): 66-68.

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In this article the feasibility of combination between power plant project and seawater desalination project in a recycling economy way was studied and an analysis about the heat load of certain power plant and the heat load needed by a certain scale of seawater desalination project was conducted. A method to utilize the heat of warm blow down seawater was proposed, both once through cooling system and recycling cooling system, which can raise the efficiency of the desalination system. Through comparison the combination of seawater desalination plant and power plant can reduce desalination cost by almost 20% and lift the power plant’s full capacity operation time and its according profit ability. In the end,this study declared that the combination of these two kinds of project was identical to the idea of recycling economy.

A utilization method of residual pressure and residual energy in circulating water cooling tower

YANG Xuejun;LAI Xide

2009, 31(12): 69-70.

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There are many circulating water systems with large flow level of 10000t/h in the industrial domain. The system has much of residual energy and pressure, and, by reformation of their unreasonable and unscientific parts, more recoverable energy could be excavated. The power generation system using residual energy of circulating water will transform the energy of backwater into mechanical energy, and further transform it into electric energy. If the electric energy is small, it can be feedback into system itself or feed other devices with low power demand. But for circulating water system with large flow such as thermal power plant, a independent power generation station using residual energy of circulating water could be built, and its generated electric energy could be directly transmitted to power grid. The system has realistic significance for energysaving and emissionreduction.

Waste treatment technology of nuclear power plant

MA Junbiao;HAN Mailiang

2009, 31(12): 70-72.

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The importance of collection and treatment of conventional nuclear waste and wastewater in nuclear power plant and the classification treatment method were introduced. The research and developing directions of nuclear waste and wastewater treatment in nuclear power plant were discussed, and it is pointed out that the commercial operation is the future trend of nuclear waste treatment.

Stochastic optimization model and its hybrid intelligent algorithm for wind power station

LI Hongju;LIN Liang;SHI Shuanglong

2009, 31(12): 73-76.

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Due to the complexity of wind power station reactive power optimization and the randomness of wind power generation, the reactive power optimization of wind power station is no longer a question with certain solution in conventional sense, and it is difficult to obtain economical and more reliable solution by traditional method. Considering the input and output power and reactive power as random variables, a reactive power optimization mathematic model for wind power station had been built based on the chanceconstrained programming.In this model the relevant constraint conditions were described in probability mode, the constraint conditions were considered which include the terminal voltage limit of wind power generator, the limit of output active and reactive power of generator, the line tidal flow equation, the output power limit of load nodes and others, and the hybrid intelligent algorithm was used to find the solution of the question. It is proved by an example of a system with three nodes that the model and the algorithm are effective.

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