Integrated Intelligent Energy

Water Resources Utilization Situation and Countermeasures of Thermal Power Unit

JIANG Zi-Sheng;HAN Mai-liang

2008, 30(6): 1-5.

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The water resource utilization and water business management situation of thermal power plants in China Huadian Co. Ltd. were described. The water resource developing and utilization, the water saving technique and the improving measures were discussed with comparison of water consumption index of thermal power plants in domestic and abroad. The influences of restriction of construction of thermal power plants by the environment protection policy and the scarcity of water resource were expounded, and some suggestions given in this paper are as following: taking the urban sewage re-using and seawater desalination as the future important water resource, drawing up the strategy of water resource reserve scientifically according to the general distribution of power plant sites and its development of whole group.

Choice of the Parameters and Main Pipe Material of 1000MW Unit

ZHAI Shen-hui

2008, 30(6): 6-9.

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The parameters of existing 1000MW Ultra-supercritical units were analyzed combining with the development tendency of the same units domestic and abroad. The recommended parameters for the project of Boxing Power Plant are as follow: 26.25MP and 600℃/600℃ for the ultra-supercritical turbine inlet, 27.56MPa and 605℃/603℃ for the related boiler. The evaporation capacity of boiler usually matches the working condition of VWO (valve widely open) of turbine. By analysis for the parameters of the pipe material, P91, P122 and T91 are selected for the main piping material for this 1000MW unit.

Influence of Gland Leakage on Economy of Unit

Zhai pei-qiang

2008, 30(6): 10-12.

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The designed heat consumption rate of supercritical steam turbine generation unit has higher circulation thermo-economy, but sometimes this advantageous was not realized in practical operation. In this paper the author took a unit as an example, analyzed the influence of gland seal leakage in high pressure parts on economy of the unit, and gave some concrete influence values quantitatively, the results can be used as a reference for the similar units.

Approach on Reduction of House Power Consumption in 300 MW CFB Boiler Unit

DONG Zhi-qian;XU Wei-jie;HAO Ru-ping;KANG Xue-sheng

2008, 30(6): 13-17.

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The necessity of reducing the plant power consumption of 300MW CFB unit was analyzed. Some methods for reducing the house power consumption were introduced from aspects of management, technical reformation and operation mode optimization respectively. The technical difficult problems of the higher auxiliary power consumption rate in 300MW CFB unit were solved, and this is advantageous to the upsizing of CFB boiler capacity and its development in our country.

NOx Emission Control and System Efficiency Increasing of IGCC Power Plant

CAI Zhiping;JIN Xiangyang;YU Luo

2008, 30(6): 18-21.

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The NOx emission control and system efficiency increasing of IGCC power plant were analyzed and calculated theoretically. The nitrogen dilution process and W+SCR process were compared in different aspects including thermal efficiency, technical risk and economical efficiency. The conclusion shows W+SCR is the most economical and reliable method at the present time for reducing NOx emission, in addition to this, the system efficiency can also be raised by using W+SCR method.

A Study on Optimal Algorithm of Real-time Load Dispatch Among thermal Power Units

ZhOU Yunshan;LI Guodong;ZHANG Miao;SHI Xiangbin

2008, 30(6): 22-26.

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To build the power market is for introducing competition mechanism in power industry, improving the production efficiency and lowering the power generation cost. According to the energy consumption characteristics curves gotten from operation data, the load optimal objective function and the restrained equation were constructed for thermal power unit. Based on the operation information of six units in one power plant, the optimum dispatch was realized among those units by using optimal algorithm, and the results, which were calculated by equal-microincreas rate method and Complex method, were compared and analyzed.

The Density-type Gas Purity On-line Detection device Based on the Centrifugal Fan Impeller Theory

ZENG Yan-feng;HAN Zhi-cheng

2008, 30(6): 27-29.

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The working principle of density-type gas purity on-line detection device based on the centrifugal fan impeller theory was introduced, and the influence of mixed gas composition on its measuring error was analyzed. The factors, which influence on the measuring accuracy caused by improper operation and maintenance, were summarized, and the method for preliminary determination of the detector measuring accuracy was given also.

A Sampling Measurement Algorithm without Frequency Tracking Based on Electronic Instrument Transformer

REN Xin-yuan;TANG Yu-hai;

2008, 30(6): 30-31.

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Electronic instrument transformer has excellent characteristics compared with traditional electromagnetic one, but the AD sampler is separated with measurement, observation and control and protective device, and this leads that synchronized sampling became an important question influencing measuring accuracy. A survey algorithm without frequency tracking was put forward in this paper. The algorithm does not require entire station synchronization sampling, the electronic instrument transformer can operate at the standard fixed sampling period, its design can be simplified and the cost can be lowered greatly. the survey algorithm is to seek the data array characteristic obtained from analyzed message, then compute every demanded electric quantity, and the effective values of voltage and current by means of its peak to peak values detection, thus accomplish the power computation by zero point detecting to measure the frequency and phase difference.

Approach on the Efficiency Enhancing and Energy Saving Potential of High Voltage Power Supply of EP

GAO Wei-ying;FU Qi-wen;LU Ze-feng

2008, 30(6): 32-35.

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The high voltage power supply device of EP plays a significant role in adaptation of EP to operation condition and raising global function of EP. The features and functions of several domestic high voltage power sources were analyzed. A new high voltage power source control device of EP developed at home was introduced in detail. This device has advantages of effectively eliminating the damage of discorona, increasing the dust removal efficiency and lowering electrical energy consumption at large amplitude. It is pointed in the end of this paper that the high voltage power supply mode of spark automatic following, which has been used in our country widely for many years, is of great power and high energy consumption, and it should be replaced by efficiency-enhancing, energy-saving high voltage power supply mode, which has higher peak voltage, lower average voltage and smaller current, as soon as possible.

Diagnosis and Analysis on Abnormal Combustion Condition of Boiler

YIN Minquan;GAO Xi

2008, 30(6): 36-39.

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Lowering coal quality will influence the stability of combustion seriously, and unstable combustion causes the significant changes of wall temperature in furnace and water level fluctuation in drum. This will led to the flame out not only during high-load operation, but also in stoppage process, which the unit has to shut-down unnormally because of big block of slag. The combustion conditions of #1, #2 and #4 boiler were compared with that of #3 boiler. The questions left over in burner reformation were analyzed and synthesized combining with the change of coal quality and the operation status of each burner. The reason of abnormal combustion condition of #3 boiler was finded out.

The Deformation Control of 1000 MW Ultra-supercritical Turbine LP Outer Cylinder in Field-assembling

JIANG Jian-ping

2008, 30(6): 40-44.

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The structure features of 1000 MW ultra-supercritical turbine produced by Siemens, the type of LP (low pressure) outer cylinder structure and its assemble welding procedures were introduced. The field-assembly and welding are the heavy work because the outer casing has large volume, many and long welding seams. The low quality of assembly and the large welding deformation would cause the clearance occurring in horizontal split, vacuum leakage and dislocation of bolt hole. The assemble welding technology was adopted in welding of top half and lower half of LP outer cylinder, so its deformation could be controlled in field-assembly. The main control points of melding in LP outer cylinder were described according to the control requirement.

Investigation on Primary Air System Commissioning of 3030t/h Super-critical Boiler

Wang Xinghe;YANG Jiasheng;ZHANG Zongxing;YIN Jun

2008, 30(6): 45-48.

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There was the problem of pulverized coal deposition in the primary air pipe of dual inlet and outlet ball mill of #7 boiler in Zouxian Power Plant, and the primary air inlet temperature was on low side. The present situation of the boiler was examined concern with design, installation, coal quality and other factors. Thus the causes of the coal deposition and lower temperature mentioned above were analyzed, and some preventive measures as well as suggestions were proposed in this article.

The Reason Analysis of Misoperation for UNS 3020 Type Generator Rotor Winding Earth Fault Protection

MA Tie-jun;MA Cheng;HU Xian-you;YUE Yang;ZHANG Zhuo-yin

2008, 30(6): 49-51.

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The principle of UNS 3020 type generator rotor winding earth fault protection device was introduced, and the reason of the occurring protection misoperaion in power plant operation was analyzed. The problems needing attention in commissioning, routine inspection, maintenance and overhaul were pointed out. The concrete measures for avoidance misoperation were given.

Analysis on Operation of Limestone-gypsum WFGD Equipments

ZHI Guoqing;YANG Ye

2008, 30(6): 52-56.

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The operation status of limestone-gypsum wet flue gas desulfurization equipments of 300MW unit was introduced in detail. The existent problems were analyzed, and the solving methods were proposed. Some suggests about operation and maintenance of current flue gas desulfurization equipments and their management system were put forward.

Analysis on rotary coal dumper Choice

ZHANG Fan-hua

2008, 30(6): 57-60.

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The application scope and equipment type of rotary coal dumper were introduced. Its performance features, manufacturing capacity and technique level at home and abroad, were analyzed. Based on these, the coal unloading arrangement form and system constituent of rotary coal dumper were discussed, the process arrangement and the construction form of rotary coal dumper were selected for 2×1000MW units in phase Ⅳ project of Huadian Power International Zouxian Power Plant.

Application of Foundation Fieldbus Control Technology in 1000 MW Ultra-supercritical Units

LIU Ji-ze

2008, 30(6): 61-63.

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The foundation fieldbus control technology is novel digitization control technology with higher control accuracy. The principle of foundation fieldbus control technology was introduced, its characteristics and application were discussed, and its advantages and disadvantages existing in operation were analyzed. The application of foundation fieldbus control technology in 2×1000MW units of Huadian International Zouxian Power Plant shows that to apply this control technology on large units is feasible.

Integral Saturation in Digital PID Control

YANG Jin

2008, 30(6): 64-67.

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The problem of integral saturation occurred in engineering application of PID controller which is most common in the computer control system was analyzed. Several anti-saturation methods were introduced. The simulation shows that the improved algorithm used in this thesis can eliminate the integral saturation effect better than the conventional one and is valuable in practical application.

A New Treatment System for Flushing Slag Water of Thermal Power Plant

XU Qi-feng;WEN Ming

2008, 30(6): 68-70.

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The principle and process flow of a new treatment system of flushing slag water were introduced. The core technology of waste water purification for flushing slag water treatment system is flocculation and sedimentation, and the key point is control of addition dosage. The optimum flocculent quantity was determined by experiments and the good flocculation was obtained. The application of the flushing slag water treatment system in Wenzhou Power Plant was described in detail.

Application of Lime Coagulation and Clarification Treatment for Waste Water in Power Plant

XU Qing-dong;XIN Shu-wei

2008, 30(6): 71-73.

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Taking the waste water treatment system of Huadian International Zouxian Power Plant as a example, using the secondary treated municipal wastewater and the sewage of power plant as the waste water source, the principle and method of lime coagulation and clarification treatment were introduced. Based on these, the selection of technology, the waste water treatment system, and process flow of reclaimed water deep treatment were described in detail, and three terms needing attention in lime coagulation and clarification treatment were proposed.

Wind Speed Detection System Based On Single Chip Processor

SHAO Mei

2008, 30(6): 74-77.

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Aiming at the disadvantages 0f current wind speed collection and detection device which is large, heavy, and wire for data transmission, a portable wind speed collection and detection system was designed by using of single chip processor AT89S51. In this system the modularized design idea was introduced, the functions of data collection, display and data transmission are all-in-one, this system has independent power supply, hand-hold operating, and convenient data transmission. This system can be used as a reference of wind speed detection system design in the industrial application.

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