Integrated Intelligent Energy

NCB installation scheme for 350MW supercritical heat supply unit and economic analysis

ZHENG Liwen

2013, 35(5): 1-4.

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Taking the 2×350MW supercritical coalfired heat supply unit as example, the feasibility, reliability and economical efficiency of the condensate extraction and backpressure (NCB) installation scheme were analyzed. To adopt the NCB technical scheme can improve the heat supplying capability and the economical efficiency of the unit significantly.

Operation optimization of circulating water system of 300MW heatsupply power unit

MA Yanxin

2013, 35(5): 5-6.

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The composition and working principle of circulating water system were introduced. The problems of the unit occurred in winter operation condition were analyzed. The winter operation of the circulating water system was optimized; the LV valve position of the turbine was arranged rationally; related technical measures were drawn up. The house service consumption rate was reduced greatly; and favorable economical benefit was obtained.

Analysis on application of lateral tooth steam seal in domestic 300MW steam turbine

ZHANG Quan

2013, 35(5): 7-9.

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Taking the reformation of terminal steam seal of the domestic 300MW unit turbine in a power plant as example, the deficiencies of the traditional steam seal were analyzed. The features of the lateral tooth steam seal were introduced. After the terminal steam seal of the steam turbine in the power plant was transformed into lateral tooth steam seal, the steam leakage of the terminal shaft seal of the turbine decreased by 0.45～0.85t/h，the microwater content in lubrication oil decreased significantly, the efficiency of HP and IP cylinder was improved, and the steam consumption of the unit was reduced.

Technology reform of 330MW units coal boiler

LI Fuxiang;HOU Dean;FAN Xiaoming;NIU Shusen

2013, 35(5): 10-12.

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The boiler system of 330MW units in Huadian Weifang Power Generation Corporation Limited (Phase I)main problems of boiler operation was briefly analysis, and the feasibility and implementation of boiler reform by burning bituminous coal and the safety control and benefit of burning bituminous coal was discusses, boiler reform by burning bituminous coal were importat introduced.

Numerical simulation analysis on harmful impact of wind environment on direct air cooled condenser

ZHAO Yonghui;WANG Mingren;ZHAO Xuan;LU Tao;TANG Shengli

2013, 35(5): 13-16.

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Using numerical simulation method, the air side heat exchange performance of the direct air cooled condenser was analyzed. The operation conditions of the air cooled condenser under different wind velocity and different wind direction were simulated. The main mechanism of the influence of wind velocity and wind direction on the air flow of each unit of the air cooled condenser was expounded. The measures to improve wind environment were put forward, and the effectiveness of the measures was proved by the numerical simulation results.

Study on CO2 separation technology based on pressurized chemical looping combustion with CaSO4 oxygen carrier

ZHENG Wenguang;LIANG Xiujin

2013, 35(5): 17-21.

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The CO2 separation technology based on pressurized CLC with Calciumbased oxygen carrier was introduced. The influences of the temperature and the mole ratio of the fuel in the fuel reactor under pressurized condition on the gas phase and solid phase balance constituents were analyzed, and the influence of the pressure in range of optimal temperature and mole ratio on the different constituents was analyzed too. The influence of pressure on the conversion rate of the fuel and the oxygen carrier was studied. The influences of the temperature under different pressure on the conversion rate of the fuel and the oxygen carrier and the contents of SO2 and H2S were investigated. The influence of the pressure in the oxidation reactor on different constituents was expounded. The results show that under pressurized condition, the optimal reaction temperature in the fuel reactor is 850℃ to 950℃, the optimal mole ratio of the oxygen carrier and the fuel is 0.25, the optimal minimum pressure is 0.5MPa; To increase the pressure is useful for reducing the emissions of SO2 and H2S and improving the conversion rate of the oxygen carrier and the fuel. In the air reactor, to increase the pressure is useful for reducing the emission of SO2 and improving the cycle utilization rate of the oxygen carrier.

Optimized design and application of water engineering system for nuclear power station and fossil fuelfired power plant

YANG Mancheng;ZHOU Jinquan

2013, 35(5): 22-24.

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The positions of the water intake inlet and the water discharge outlet of Qinshan Nuclear Power Station project phase II and the form of water intake engineering were optimized. Some practical examples in thermal power plant construction in the northern region, the rich in coal and waterdeficient region, were analyzed, which include to adopt direct or indirect air cooled unit, to utilize the urban reclaimed water from the sewage treatment plant as supplement water for power plant, to adopt the form of water treating island to arrange the water system of the power plant and so on. The necessity of optimized design of water engineering system for thermal power plant and nuclear power station was expounded. The result of this paper provides reference for similar power plants in water engineering system design.

Progress and prospect of study on water recovering technology from flue gas based on membrane separation method

XU Quankun;WANG Yang

2013, 35(5): 25-28.

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The flue gas of coalfired power plant contains a lot of water, and to recover and utilize the water is of great significance for water resource conservation in our country. The application of the gas membrane separation technology in the air and natgas dewatering engineering was introduced. The progress of study on water capture technology from flue gas using membrane method was presented. The key points in study on water capture technology from flue gas using membrane method were pointed out. The development prospect of the water capture technology from flue gas using membrane method was anticipated.

Analysis on reason causing mediumpressure regulating valve to close off incorrectly by itself

DAI Xihui

2013, 35(5): 29-32.

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In test of valve movability of steam turbine DEH control system, after the mediumpressure regulating valve had been opened, the valve closed off incorrectly by itself. The reason of the fault was analyzed. It was found by inspection that the logic of the test of valve movability of steam turbine DEH control system is irrational. The logic optimization scheme was proposed, which makes the logic of the valve movability test for the steam turbine DEH system to be more rigorous.

Optimization of installation method of temperature measuring elements on inner cylinder wall of steam turbine body

LIU Yinqing

2013, 35(5): 33-34.

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The problems existed in original installation method of temperature measuring element on inner cylinder wall of the steam turbine body of Guizhou Dafang Power Generation Company Limited were analyzed. The installation method of the temperature measuring element on cylinder wall and the principle of optimization were expounded. The improved installation method of the temperature measuring element on inner cylinder wall of the steam turbine body used in overhaul process of the turbine and its advantages were introduced, and the matters needing attention in optimization process was emphasized especially. The practice results show that after the installation method of temperature measuring element on inner cylinder wall of steam turbine body was optimized, favorable effects were obtained, which provides a reference for other power plants in optimization of the installation method of temperature measuring element on inner cylinder wall of steam turbine body.

Application of new double security filter in reverse osmosis device of water treatment system

XU Bin;HUANG Yutong;HE Guanghui;HUANG Xiaozhong

2013, 35(5): 35-37.

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The bacteria breed easily on the conventional RO security filter, which may cause pollution and plugging of the RO membrane. Simultaneously, the short circuit of input and output water often occurs in the conventional RO security filter. A new double security filter was installed on the front of RO device No.5 in the water supply workshop of a petrochemical plant, and a performance comparison test was carried out under the same condition. The test result shows that the hidden troubles of short circuit and leakage are eliminated in the filter, the pollution index of output water of the filter is superior to that of conventional filter, and the antibacterial effect of the new filter is obvious.

Function development and application of the production Index evaluation system for 1000MW ultrasupercritical unit

Liu Sihai

2013, 35(5): 38-39.

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Since running of two 1000MW ultra supercritical unit, there have always been a serial of problems such as low of main steam temperature,low reheat steam temperature,high of power consumption rate and high of coal consumption in Zhejiang Guohua Ninghai Power Plant.Through the implementation of the production index evaluation system and the small index value competition between teams, unit economy is effectively improved; at the same time, the improvement of the production index evaluation system were the function developmented, the important system equipment parameters were realtime analysis, these provide evidence for the operator work, improve the economy of the unit, and ensure safe and stable operation of the unit good effiect was arrived.

Analysis on defects of overcurrent protection of cascade highvoltage frequency converter and improvement measures

REN Tao

2013, 35(5): 40-42.

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The problems existing in the overcurrent protection circuit of current cascade highvoltage frequency converters and the reasons causing incorrect tripping of the overcurrent protection were analyzed. The hazard of the existing overcurrent protection for normal operation of the converter was expounded. The hardware protection was transformed into a new protection scheme, in which the hardware protection and software protection are used as standby for each other, and an improved full wave Fourier algorithm was put forward. The engineering practice shows that the new overcurrent protection scheme can improve the operation reliability of the cascade highvoltage frequency converter.

Analysis on reason of fault of boiler intelligent remote I/O device in DCS and reformation measures

ZHU Xuecun;HAO Xikuan;WU Qing

2013, 35(5): 43-44.

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The reasons of fault of boiler intelligent remote I/O device in DCS were analyzed. Some measures were adopted to reform the network structure of DCS. After the reformation, the metal temperature display of intelligent remote I/O device in DCS became normal, and the fault did not occur again.

Analysis on increase of DC resistance of gas turbine generator rotor winding and resolving method

LUO Yuhuan

2013, 35(5): 45-47.

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In Guangdong Huizhou LNG Power Plant, it was founded that the DC resistance of three gas turbine generator rotors increased during overhaul. The contact surfaces of the rotor windings were treated, the defect was eliminated, and the generators can operate safely. According to practical site state, a new method to treat the defect of DC resistance increase of rotor winding was proposed, in which it does not necessary to extract the rotor from the generator. By the method, a lot of time and materials was saved, and the overhaul risk was reduced.

Repairing technology of titanium coating on tube plate of condenser of nuclear power plant

REN Jiankang;WEI Bo

2013, 35(5): 48-51.

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The damage of the titanium coating on the tube plate of condenser of nuclear power plant can lead very severe consequences, so it is necessary to pay high attention to the damage of the tube plate in condenser maintenance process and to formulate a detailed maintenance scheme. Aiming at the practical damage situation of titanium coating of tube plate of unit No.1 in Sanmen Nuclear Power Company Limited in condenser installation process, combining with the condenser operation and maintenance manual, the possible damage forms of the titanium coating of the tube plate were analyzed comprehensively, and the corresponding repairing scheme was formulated.

Optimization of control system of watercollecting well in hydropower plant

XIAO Zhiyong

2013, 35(5): 52-53.

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Aiming at various problems existing in maintenance of the watercollecting well of Hebei Huadian Hybrid Pumped Storage Hydropower Company Limited, the power system of the watercollecting well was configured redundantly, the power supply system of the programmable logic controller was reformed, and the control process of the watercollecting well was optimized. After the reformation, the power system and the control system of the watercollecting well are all configured redundantly, so the reliability of the system was improved greatly.

Analysis on reason of abnormal longer delay of protective tripping of steam turbine and treatment

AN Jianxiong;GAO Qidong;ZHANG Shun

2013, 35(5): 54-55.

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A longer delay occurred during the dynamic transmission process of the steam turbine master protection of a thermal power plant. The abnormal situation was analyzed, and the reason of the anomaly was determined. The corresponding measures were adopted, and similar incident is avoided.

Analysis on defects of technical water supply system of hydroelectric generating set in Weihai Hydropower Station and treatment

DENG Chenghong

2013, 35(5): 56-57.

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In Weihai Hydropower Station, the temperature of the technical supplied water for the hydroelectric generating set was too high, and at summer, the cooling effects for the bearings of the hydroelectric generating set were poor. The bearing bush temperature and the oil temperature of the bearings and the air temperature of the air cooler all achieved the alarm value and were close to the temperature for emergency stop, which threatens the unit safe and stable operation seriously. The fault and the reasons of the problems were analyzed, and the defect eliminating measures were adopted. The fault does not appear again.

Analysis on reasons of higher turbidity of circulating water and countermeasures

YAN Jianwei;DONG Chaozeng

2013, 35(5): 58-59.

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The turbidity of the circulating water of unit NO.1 of Datang Linzhou Thermal Power Company Limited increased abnormally. According to analysis, it was determined that the reasons of higher turbidity of circulating water are as below: the cleaning period for the bottom of circulating water cooling tower is too long, the ambient environment of the cooling tower is bad, the bactericide peeled off and polluted by paste, the circulating water pump causes the paste to roll up during starting and stopping, and so on. The countermeasures and suggestions for controlling the turbidity of the circulating water were put forward.

Analysis on reasons of sealing oil pressure dropping in air side of generator and countermeasures

XIAO Lizheng;LIU Xiaojun

2013, 35(5): 60-61.

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In operation of the double ring sealing oil system of hydrogen cooled generator in Hubei Huadian Xiangyang Power Generation Company Limited, the sealing oil pressure in air side of excitation end dropped obviously, and the hydrogen leakage exceeded standard seriously. According to technical analysis and operation adjustment, the hydrogen sealing mode of excitation end was changed from double ring sealing into single ring sealing. The hydrogen leakage and the hydrogen purity were controlled in limits allowed by relevant regulations. The result in this paper provides reference for similar unit operation.

Analysis on the key points of column production of stackerreclaimer in circular stockyard

WANG Suni;QI Bingsheng;JIN Hailong

2013, 35(5): 62-64.

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The stackerreclaimer in circular stockyard is a kind of large, continuous, efficient, and environmental friendly handling equipment, which is widely used for storage and transshipment in coal mines, power plants, ports and so on. The most important part of stackerreclaimer is the column. The column not only carries the body weight of the stackerreclaimer, but also is the foundation to rotate the upper stocker and the lower reclaimer. The characteristics of the column are large loading, complex structure and high machining accuracy. The column is the key to the production of the stackerreclaimer. Main components of the column was analysis, the details of controlling of production process was analysis,and lays the foundation for the smooth operation of the stackerreclaimer was summaried.

Features of 1000MW level ultra supercritical units in energy conservation and emission reduction and optimization measures

WU Jianjun

2013, 35(5): 63-67.

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In the design of the 1000MW level ultra supercritical units in Power Plant B of Shenhua Guohua Zheneng Power Generation Company Limited, the economical and environment protection indexes were considered sufficiently, and the thermal cycle efficiency of the units is higher. In order to improve economic efficiency of the units further, some measures, such as the technical reformation, the optimization of the unit operation mode and the standard operation, were adopted, and obvious results of energy conservation and emission reduction were obtained. The indexes of 1000MW level units in energy conservation and environment protection are improved significantly.

Analysis on energysaving reformation of closedcycle cooling water pump

ZHANG Xiaonan

2013, 35(5): 68-70.

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The problems, which are caused by improper design and selection of the closedcycle cooling water pump of the 670MW unit in Huadian Weifang Power Generation Company Limited, were analyzed. The design parameters of the pump were modified. The entire flow pass of the impeller was optimized. The impeller was reformed by special cutting method. So the safety margin of the pump became more reasonable, and the economical efficiency of the unit operation was improved.

Application of gas turbine with 6B level of capacity in distributed energy station

ZENG Rongpeng;ZENG Weiwei;WU Dongzhan

2013, 35(5): 71-75.

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The features of the gas turbines with 6B and 9E level of capacity used in CCHP system were compared. The technical progress of the gas turbine with 6B level of capacity was introduced. Combining with concrete examples, considering several aspects, such as the performance of the gas turbine, the cogeneration of cooling heating and power, the utility rate of primary energy, the thermal efficiency, the return of investment and so on, the unit type selection for 6B level gas turbine energy station was analyzed. The influences of the fuel price, the electricity price and other factors on the investment payoff period were discussed.

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