Integrated Intelligent Energy

Analysis of Coal-fired Boiler Slagging of 1000MW Ultra-supercritical Units

WANG Xin-ge;NIU Xian-yin;XIN Ben-quan

2008, 30(8): 1-3.

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The big slag chunks were formed and fell off frequently in operation of Zouxian Power Plant ultra-supercritical boilers, and these caused some problems, such as the emergency door of the slag-off machine was opened by bulge force, the water seal lost, the negative pressure in furnace fluctuated, the temperature of flue gas rose, the superheating surface went up abnormally etc. The safety, stable operation of units was affected seriously. The reason of slagging in ultra-supercritical boiler was defined by analysis of fuel characteristics, boiler design, operation adjusting and others, and the relevant preventive measures were proposed according to the analysis.

Water hydrochemistry condition and water quality control of supercritical unit

LU Guo-ping

2008, 30(8): 4-7.

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Aiming the problems existing in all volatilization treatment process in which ammonia and hydrazine are adding to the feedwater of supercritical unit, an advanced combined feedwater treatment process was put forward in which the oxygen and hydrazine are adding to the feedwater. The comparison of the two process was given, and control indications of the water quality in the second process were put forward.

Research of Protection Configuration and Type Selection for 1000 MW Generator Set

LI li;LIU Wan-bin;LI Yu-hai

2008, 30(8): 8-12.

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The features of equipment and main bus connection in 1000 MW generator set were produced. The configuration scheme of protection was proposed, and the requirement of type selection for loss-of-excitation protection, stator earth fault protection and rotor winding earth fault protection were put forward too. It was pointed out that one of the measures to ensure the safe and economy operation of 1000 MW generator set is to increase redundancy of hardware system of protection device.

The Peak-shaving Operation Analysis of S109FA Gas-Steam Combined Cycle Unit

MAO Hua-jun

2008, 30(8): 13-15.

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The peak-shaving gas turbine usually starts up at morning and shuts down at evening, the influence of this operation mode on the unit maintenance interval, the equipment safety and economic operation, the unit efficiency and the environment protection was analyzed in detail. And it is put forward finally that the peak-shaving operation and frequent starting and shutting would be avoided in the selection of gas turbine set operation mode if possible.

Analysis of Abnormal Problem in Starting and shutting of S109FA Tandem Combined Cycle Unit

LUO Gui-ying;JIN Jian-rong;QIU Han;YU Li-fan

2008, 30(8): 16-19.

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The abnormal problems occurred frequently in starting and shutting process of S109FA tandem combined cycle unit manufactured by CE Corporation. These problems were as follow: the vacuity dropped when by-pass put in operation during cold starting, the control valve of high pressure by-pass closed no tightly and leaked when high by-pass quitted, the drain pressure of desuperheator can not achieved auto-close set point in operation with low load, the level in the drain tank of steam turbine proper lowered and vacuity dropped, the circulating water temperature deviation on the second outlet of condenser increased. The relevant handling methods for solving the problems mentioned above were put forward.

Analysis and Design of Cross-platform SCADA Graphic System

LIU Wen-biao;ZHAN Cheng-guo

2008, 30(8): 20-23.

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Graphic system is an important part of power plant and substation automation system. The requirement of cross-platform, power plant and substation automation graphic subsystem was analyzed. Aiming at the drawback of the current system, based on the comparison of several graphic system develop technology such as Eclipse/GEF, GTK, QT/QSA, SVG etc., according to the idea of composite mode and the variation of basic graphic sign property, a new graphic system design and realization method was put forward .

The erection and commission of 1000MW domestic turbo-generator

ZHANG Xin-chun

2008, 30(8): 24-26.

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The feature of the first domestic turbo-generator was described. The organization and management of turbo-generator erection and commission while the generator delivery was lagged seriously were expounded in detail. The feasibility of condenser covering while the generator is not in location was proofed, and the measures must be adopted were given too.

Approach to Blended Coal Combustion Technology

SUN Zhi-hong;LIU Xiao;SHU Wen-liang;LI Sheng-he;QI Guang-zhong;LIU Run-hua

2008, 30(8): 27-29.

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The blended coal combustion can make a great economic benefit for power plant. The concrete blending methods of different grade coal were introduced in detail, some intimated knowledge and existing problems in coal blending were summed up. The practical experience in management of blended coal combustion was summarized, it is expected that the experience can be used as reference for management regulation formulation of blended coal combustion.

The Analysis on Common Problems of Return Cone Valve and Deslagging Cone Valve

LI Xin-min

2008, 30(8): 30-32.

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The constructions of return cone valve and deslagging cone valve in domestic 300 MW CFB boiler were introduced, the problems often occurred in the two cone valves operation were described, and the reasons causing these problems were analyzed. Aiming at these problems, the relevant measures were proposed, the implementation of these measures enhanced the safety of unit operation.

Power system low frequency oscillation electro-mechanical calculation based on strong correlation generator group

LI Song;WANG Bin

2008, 30(8): 33-35.

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The Start-up System of Supercritical Once-through Boiler and its design

WANG Feng;ZHOU Li-hui;ZHANG Zi-hua

2008, 30(8): 36-40.

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The once-through boiler start-up system is one of the key techniques of supercritical units. The once-through boiler start-up system and the turbine bypass system are important measures to ensure that the unit start-up, shut-down and operation with low load safely and economically, these are same important for appropriate accident handling too. The start-up and control system of the supercritical once-through boiler were described, which includes the start-up system classification, the features of system configuration, starting process flow and others.

The Rubber Ball Cleaning System Reformation of Import 350MW Unit Condenser

SHAO Fei-yue

2008, 30(8): 41-43.

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The design and operation of condenser rubber ball cleaning system of 350MW import units were introduced. The problems existing in this system were analyzed in detail. After the system reformation was accomplished, the ball cleaning device can operate normally, and the rate of ball recovery was raised. This show that the reformation effect is obvious.

Upgrade and Reformation of Multichannel Temperature Modulation System of Power Plant

WU Guang-feng

2008, 30(8): 44-46.

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The features and drawback of temperature data acquisition system used in the unit №1 of Shajiao C Power Plant were analyzed, and the reformation scheme of the system and its selection were described. The features and function of the reformed system were expounded comparing with that before reformation, which shows that the system reformation was successful.

The application of refrigeration equipment in raising condenser vacuity

SUN Shu-hong;ZHANG Min

2008, 30(8): 47-48.

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In the large condensing power plant the water-ring vacuum pump usually used as condenser air exhaust equipment. A method for raising vacuum pump output was introduced, which reduces the temperature of vacuum pump mechanical seal water by using a refrigeration equipment. The conclusion drawn by analysis and comparison is that this method can raise condenser vacuity obviously at summer, and the economical efficiency of the generation unit can be raised.

Analysis of typical malfunction in microcomputer distance protection

WANG Mao;MA Tie-jun

2008, 30(8): 49-52.

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The distance protection has advantageous of flexible operation mode, reliable action and stable performance due to the performance of distance protection is influenced by electric system operation mode slightly, so distance protection is applied in lines of various voltage classes. But there are some problems needing attention in distance protection, and several malfunction faults are the problems occurred frequently. The several malfunction faults were analyzed, and the concrete measures to prevent malfunction were given in this paper.

The Reason Analysis of Hydroelectric Generating Set Self-rotation after Stopping Air Brake Quitting

DONG Yi-wei;CHEN Yu

2008, 30(8): 53-54.

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After stopping and air brake quitting, a hydroelectric generator set may rotate a certain angle slowly and then stop by self. The possible electro-magnetic, hydraulic and mechanical reasons were analyzed in detail. The conclusion drawn is that the guide blade sealing strips were fixed no firmly, and the self-rotation was eliminated by a minor overhaul.

The Variable Frequency Speed Control Technique and Application on Fans and Pumps in Thermal Power Plants

LI Ming;HUANG Pi-wei;ZHU Guang-ming;JIAO Qing-feng

2008, 30(8): 55-57.

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The application of the variable frequency speed control technique in power plant became wide gradually along with deepening of energy saving and consumption reducing. The technique and energy saving principle of variable frequency speed control were produced. The energy-saving effectiveness of variable frequency speed control technique was analyzed according to the application instance of variable frequency reformation of power plant auxiliaries, and the problems needing attention in the technique reformation were pointed out.

Discussion on the Technology and Operation of Direct Air-cooled Unit

SHEN Ting

2008, 30(8): 58-60.

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The device arrangement and advantageous of direct air-cooled unit were introduced. The problems occurred in operation of direct air cooled unit were expounded, and the causes of these problems were analyzed. By taking relevant measures and solving schemes the failure rate was reduced and the unit trouble-free running has been ensured.

The Improvement and Perfection of Chemical Water Treatment System

LI Bin;JIANG Quan-cai;SONG Zhan-ming

2008, 30(8): 61-62.

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The problems existing in the chemical water treatment system of the heat-supplying extension project of Harbin Thermal Power Co., Ltd. were analyzed deeply. The problems needing attention at preliminary design examining, design, commission and operation were pointed out. The measures for system improvement and perfection were put forward in this paper.

The Combustion Control Tactics of Supercritical Units

SHI Gang

2008, 30(8): 63-66.

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The coordination of supercritical boiler operation is coordination of air flow, water flow and coal mainly, the controlling indications are coal-air ratio and coal-water ratio. The principle of the control modules which includes mill rotating speed control, primary air control, secondary air control, overfire air control, oxygen content correction control, fuel oil pressure control, furnace pressure control etc. was produced in detail. The control tactics to ensure boiler stable combustion were put forward which demands that in the system design the dynamic cross interlocking of coal and air flow must be considered on the precondition of static balance for the coal-air ratio control, and the air flow must be greater than coal at the dynamic process.

The Electrical Features and Equipment Configuration of 1000MW Unit

LIN Yong;MENG Qiang;WANG Shi-bo

2008, 30(8): 67-70.

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The general situation of 1000MW coal-fired units was introduced. The main electrical connection scheme, the secondary wiring plan, the features of lighting system and the equipment configuration were described in detail. The units operation shows that the design of unit electrical system is rational, and the operation of equipment is reliable.

The Energy-saving Effect Analysis of Replacing Condensate Pump by Drain Pump of Low Pressure Heater at Starting and Shutting Process

JIANG Xu-liang;LIU Qing-he

2008, 30(8): 71-72.

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The technical characteristics of drain pump of low pressure heater and condensate pump were described, and their technical parameters were compared each other, then a reformation plan was put forward which demands replacing the condensate pump by drain pump at starting and shutting process. The energy-saving effect is notable after the reformation realized.

The application of iron exchange equipment in condensing water fine treatment system of nuclear power plant

SHEN Jian-yong;WANG Zheng-ping;HU Jian-guo

2008, 30(8): 73-74.

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The normal spherical iron exchange equipment can not satisfy the operation requirement of condensing water fine treatment in 1000MW level nuclear generation unit due to the large water flow needed. And in engineering practice the large-diameter iron exchange column has not success operation instance yet. The relevant project research was developed combining the practical engineering, and positive result was obtained.

Discussion on Polygeneration System for Methanol and Power Production with CO2 Recovery

LI Xing

2008, 30(8): 75-78.

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One of difficulties for developing new energy system is how to control CO2 emission and to raise the utility effect of energy source at the same time. Taking the chemical production and power polygeneration system as a breakthrough point, taking the concept of integrating clear energy production with CO2 separation as the guiding ideology, the key factors influencing the energy consumption for CO2 separation were defined. From the thermodynamics theory foundation of CO2 separation, the methanol-power polygeneration system was introduced and analyzed, and it was pointed out finally that the polygeneration system is of high-efficiency and energy-saving, and it is also has the potential of greenhouse gas control.

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