Integrated Intelligent Energy

Reasons and countermeasures of larger difference of calorific value between asreceived coal and asfired coal

JIA Yuan

2010, 32(S1): 1-3.

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The thermal power plants pay high attention to the difference of the calorific value between asreceived coal and asfired coal. The proper control for the difference of the calorific value is of active significance to reduce the generation cost and promote the safe and stable operation of the power plant. Starting from the sampling, the reasons of the larger difference of the calorific value between asreceived coal and asfired coal were analyzed. The relevant countermeasures were proposed, and the index of the difference of the calorific value was improved considerably.

Operation adjustment of the DG1025 type boiler burning poorgrade coal

LI Biao;DAI Jingyi

2010, 32(S1): 4-5.

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From the angle of equipments, coal property and operators, the control modes have been optimized when the poorgrade coal is burned in the boiler of Yunnan Huadian Kunming Power Generation Corporation Limited. The boiler flameout faults were reduced, the abnormal fuel oil consumption was decreased; and the purposes of security and economical efficiency for the unit operation were reached.

Application of multirank coalblended burning in 300MW unit

LI Jianyun;CHEN Lunqian

2010, 32(S1): 6-8.

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Based on summary of the coal supply situation of the Yunnan province, according to the demand of the boiler combustion adjustment, aiming at the main technical characteristics of the 300MW subcritical boiler of the Yunnan Huadian Kunming Power Generation Corporation Limited, the management and control of the asreceived coal were enhanced. The coalblended burning was expounded in detail from several respects, such as to satisfy the emission requirement, to ensure the stability of the boiler operation, to enhance the adaptability of the boiler to the coal grade and etc. The practical experiment of the coalblended burning adjustment was carried out, and excellent result was obtained.

Reason analysis of coal jamming in boiler minerun bin and countermeasures

JIA Yuan

2010, 32(S1): 9-11.

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The coal jamming in boiler minerun bin will greatly decrease asfired fuel quantity，the coal jamming occurred in two or more coal bins will cause the flameout fault in boiler, which will seriously influence the safety operation of boiler and increase the consumption of combustion supporting oil. the analysis that the reasons of coal jamming include the change of coal variety (decrease in the coal partical size, increase in the water content) and the unreasonable local design of coal handling system ,etc. Aiming at the abovementioned reasons, the countermeasures have been adopted, and the good results were obtained.

Thermal process control scheme in ‘one drive two’ variable frequency reformation of condensate pump

WANG Jiaoling;XIAO Min;ZHAO Shuping

2010, 32(S1): 12-13.

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In order to save energy and reduce the house service consumption rate, the condensate pumps of 2×300MW thermal power generation units of Yunnan Huadian Kunming Power Generation Corporation Limited were reformed using variable frequency technology. The modification and perfection of the thermal process control logic and the operational picture in the variable frequency reformation for the condensate pumps were introduced, and concrete requirements for operators were put forward. After the variable frequency reformation of the condensate pumps, the thermal process control logic became perfect and easy to operation, obvious energysaving effects were obtained.

Reformation of 4000m2 counterflow hyperbolic natural draft cooling tower

LI Biao;WANG Lieyong;WANG Jun

2010, 32(S1): 14-16.

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By using the technique of computational fluid dynamics (CFD), the numerical computations of three dimensional heat transfer and mass transfer in the cooling tower were carried out. Based on these, the reformation for optimized matching of the cooling air and the circulating water inside the cooling tower was accomplished; the excellent water distribution and air distribution were realized, the heat exchange efficiency was increased, the cooling effect had become higher than the designed value, and the outlet water temperature was greatly reduced, the gross coal consumption rate was decreased, and the unit operation economical efficiency was raised.

Optimization of control parameters for 300MW steam turbine governing valves

ZHAO Shuping;XIAO Min

2010, 32(S1): 17-18.

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For long time the operation mode of 300MW steam turbine of Yunnan Huadian Kunming Power Generation Corporation Limited was below rated load. Using experiment method the sliding pressure operation curve for the best steam pressure was found out, and the relation between opening of steam turbine governing valves and the largest thermal efficiency was obtained. The application of sequence valve controlling for steam turbine governing valves tremendously decreases the throttling loss of single valve operation, and increases the thermal efficiency of steam turbine.

Research of realtime supervision information system of digitized power plant

LI Lei

2010, 32(S1): 19-21.

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Combining the practical experience with the theoretical research result, the functions of the realtime supervision information system (SIS) in production management of the power plant and the thought of the system design were studied. It was expounded that how the data information of the production control system is utilized effectively by the management layer of the enterprise. The hardware configuration of the SIS, including the structure of the network, the direction of the data flow, the function station, the interface machine and others, was analyzed. At last, the application effect of the system at present was evaluated.

Optimization of auxiliary power operation mode of 2×300MW unit

ZHAO Fangming

2010, 32(S1): 22-25.

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The operation mode of the auxiliary power system is directly influencing on the safe and economical operation of the entire power generation enterprise. According to the requirements of the power grid and the demands of the enterprise, aiming at different time sections, the operation mode of the auxiliary power system was optimal combined.

Improvement of dust removal in outlet of coal crusher

CHEN Jun

2010, 32(S1): 26-28.

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The dust production and diffusion mechanism were introduced. The reasons of the high dust density in the outlet of coal crusher were analyzed. The dust removal equipment in outlet of the coal crusher had been improved. So the dust removal efficiency of the equipment was raised, and the dust density in the outlet of the coal crusher was reduced.

alysis on the adjustment of desuperheating water flux in 300MW units

LI Biao;DAI Jingyi

2010, 32(S1): 29-30.

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Because of combustion adjustment, decrease of desuperheating water flux will lead to unit operation condition depart from designated parameters. By analyzing the influence of desuperheating water flux and steam parameters on the operation economy of 300MW units to search their relations, coal consumption was decreased, and operation economy was raised.

Optimized adjustment of high voltage cubicle operation mode of the electrostatic precipitator

XIAN Guizhi

2010, 32(S1): 31-32.

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The power consumption of the electrostatic precipitator of Yunnan Huadian Kunming Power Generation Corporation Limited was larger. Aiming at this problem, the high voltage cubicle operation mode of the electrostatic precipitator was adjusted. After the adjustment, the power consumption rate was decreased, and obvious energysaving effect was obtained.

Analysis of security strategy for internal network information of thermal power plant

MU Xin

2010, 32(S1): 33-36.

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The internal network of the thermal power plant includes two systems of the production control and the management information. Based on the analysis of the structure of thermal power plant internal network and the potential security hazard, the content needing emphatic consideration in the security strategy of the internal network, and the security system structure of the internal network and the related security technique were discussed.

Retrofit of pebble coal removing system for boiler mill

CHEN Jingbo

2010, 32(S1): 37-38.

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The problems existing in the original desigined pebble coal removing system of 1025t/h subcritical pressure boiler were anaylised, and the retrofit scheme was pressented, the working environment pollution problem caused by the pebble coal removing system has been solved, and the safety, economy and reliability of the boiler operation have been enhanced, the presumptive effectiveness was attained.

Analysis of vibration of shaft system in 300MW unit and treatment

LI Biao

2010, 32(S1): 39-42.

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In the turbine set rolling start process, the vibration is main parameter of the shaft system operation monitoring. If the vibration occurred and has not been treated in time, then the equipment may be damaged. Proper treatment can avoid effectively the equipment damage accident. The reason of the vibration of the 300MW unit No.1 of Kunming Power Generation Corporation Limited occurred during a warm start process was analyzed, and a treatment scheme was put forward.

Treatment processes for cracks in the last stage blade of low pressure rotor of steam turbine

ZHANG Yujiang

2010, 32(S1): 42-43.

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After operating several years, the drain erosion of last stage blade of the turbine low pressure rotor may occur inordinately; and after repairing, some cracks may be occurred in the repaired area. The treatment processes for the various cracks in the last stage blade were introduced. The treatment processes can be used as reference in repairing the low pressure rotor blade of the similar turbine of other power plants.

Discussion on the safety inspection and test of hydrogen making equipment in power plant

XIA Yu;LI Yang;TAO Qihua

2010, 32(S1): 44-46.

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The routine maintenance and repair of hydrogen making equipment are an important task to guarantee the electric generator safe operation. Aimming at the characteristics of DQ-10/3.2 medium pressure hydroelectrolytic hydrogen producer of thermal power plant, the process of hydrogen substitution was expounded, the inspection and test methods as well as the notable problems when put into operation again were introduced , which can be as the refference for inspection and test of hydrogen making equipment.

Optimization of erection sequence of boiler steel frame

HAN Yunmai

2010, 32(S1): 47-47.

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Based on the analysis of the conventional hoisting scheme for boiler drum combining with the physical condition, the hoisting sequence for #1 boiler steel frame and drum of Yunnan Huadian Kunming Power Generation Corporation Limited was optimized to reach the goal of reduction of erection time and enhancement of work efficiency.

Analysis and treatment on the inter contact of a circulation water pump motor

CHEN Yi;TIAN Yuqin

2010, 32(S1): 48-49.

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A fault which impact and friction happened between the rotor and stator in a circulation water pump motor was analyzed, and a treatment measure was proposed, a preferable result has gotten after the proposal had been application.

Influence of compact layer on nonblocking reverse flow regeneration cation exchanger

LI Yun

2010, 32(S1): 50-51.

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The quantity of cycle output water of desalting system cation exchanger drops sharply by the influence of compact layer, its reasons were analyzed, and the resolving measures were proposed, after application of the proposals, the quantity of output water increased and the production costs decreased effectively.

Reason analysis of blacking of water circulating pump motor oil and preventive measures

ZHANG Peiyi

2010, 32(S1): 52-53.

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In the operation of the water circulating pump motor of the Yunnan Huadian Kunming Power Generation Corporation Limited, the oil in the oil chamber of the upper guiding bearing pads was blackened. By analysis, the reason of oil blackening was found, and it's hazard was expounded. Aiming at the problems existing in overhaul of the water circulating pump motor, the treatment methods and the preventive measures were put forward.

Discussion on survival space of the coalfired power plant in Yunnan Province

LIU Xingming

2010, 32(S1): 54-58.

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According to the storage and the utilization situation of the coal resource in Yunnan province, the installed capacity and the development of the coalfired power plant and the large variation of the energy source structure in Yunnan Province were analyzed. These factors seriously threaten the survival space of the coalfired power plant in Yunnan province. The way out of the coalfired power plant in Yunnan and the price setting mechanism of the electricity generated by coalfired power plant in Yunnan Province under new situation were analyzed.

Optimization of startup and shut down of 300MW coalfired unit and oilsaving and consumption reducing

FAN Shanli

2010, 32(S1): 59-60.

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The reason of high consumption of fuel oil during the startup and shutdown of the 300MW coalfired unit of Yunnan Huadian Kunming Power Generation Corporation Limited was analyzed. The multiple improvement measures were adopted. The oil consumption during the startup and shutdown of the unit was obviously decreased, and the purpose of safe and economical operation was realized.

Reformation of pH meter and densitometer in FGD absorption tower

LIU Jianping

2010, 32(S1): 61-62.

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The data of the seriflux densitometer and the pH meter in wet FDG absorption tower are important parameters for FGD system operation supervision. The installing locations of the densitometer and the pH meter are very important for decreasing the wear of the devices and the maintenance cost and for enhancing the safety and the reliability of FGD system operation. The seriflux densitometer and the pH meter of the 300MW unit FDG absorption tower in Yunnan Huadian Kunming Power Generation Corporation Limited were reinstalled in new locations. The successful experience of the location reformation was presented in this paper.

Treatment of overlarge pressure difference in GGH of desulphurization system

ZHOU Chaorong;ZHU Hui;LIU Jianping

2010, 32(S1): 63-64.

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Aiming at the overproof problem of pressure difference of GGH caused by fouling on the heat exchange elements surface, the cleaning method was improved, and the GGH was reformed partially. The operation reliability of desulphurization system was enhanced. In addition, some problems, which still exists after the reformation and needs further research and treatment, were pointed out.

Maintenance of online analysis system of flue gas in desulphurization system

SUN Chunmei;WU Zaishu

2010, 32(S1): 65-67.

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The measuring principle and the working process of the flue gas continuous emission monitoring system (CEMS) were introduced. The faults and defects often occurred during CEMS operation were analyzed, and the daily maintenance and overhauling methods were proposed.

Experiment on lownitrogen combustion of boiler in 300MW unit

DAI Jingyi;LI Jianyun

2010, 32(S1): 68-70.

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Based on summarization and digestion of the boiler combustion adjustment technology, aiming at the operation features and technical characteristics of the 300MW subcritical boiler of Yunnan Huadian Kunming Power Generation Corporation Limited, the operation management and the operation adjustment were enhanced. The experiments and comparisons in the topics, such as the reducing the NOx emission, the burning of poorgrade coal, the enhancing the stability of the boiler operation and others, were carried out, and the various indicators were satisfied the requirements of environment protection emission standards, and the better results were obtained.

Research on desulphurization environment protection management of thermal power unit

LI Yang;XIA Yu

2010, 32(S1): 71-73.

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The desulphurization technology of thermal power unit was expounded. Taking the environment protection management of the Yunnan Huadian Kunming Power Generation Corporation Limited as an example, the desulphurization environment protection management of the thermal power unit was discussed, which includes the operation management of the parameter indexes of the desulphurization system, the management and supervision of the CEMS in daily operation, the governing of the equipments of the desulphurization system and so on. Combining with the operation situation of the desulphurization system, the suggestion of the desulphurization environment protection management was put forward to ensure the safe, higheffective and economical operation of the desulphurization system.

Discussion on energy conservation administration in Yunnan Huadian Kunming Power Generation Corporation Limited

CHEN Lunqian

2010, 32(S1): 74-77.

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Through carrying out benchmarking, energysaving, technical update and energyloss analysis,etc., Yunnan Huadian Kunming Power Generation Corporation Limited allocated all kinds of internals resources efficiently to warrant the unit operation in the manner of safety, environmental conservation, economy and stability, increase energy ultilization ratio, decrease energy consumption, optimize energysaving management, therefor，resourceusage ratio has been increased, operation costs have become lower, the core competition and management level of enterprise have gained improvement.

Innovation operation management for improving unit economy and safety

DAI Jingyi

2010, 32(S1): 78-80.

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Based on the economical analysis, the major economic indicators were calculated and monitored in the realtime for boiler, turbine and auxiliary equipments, according to current operating parameters, the unit's operation conditions were analyzed and diagnosed, changing the operation management to increase its safety and economy.

Functions of effectiveness supervision for enterprise in costreducing and effectincreasing

CHEN Yonggeng

2010, 32(S1): 81-83.

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In order to reduce the energy consumption and enhance the electricity production efficiency, the Yunnan Huadian Kunming Power Generation Corporation Limited selected the fuel management of thermal power plant, which is the weakness in the enterprise management, as the special topic of the effectiveness supervision of the enterprise. The effectiveness supervision obtains favorable economic benefits and social effects, and may provide a reference for enterprises in their effectiveness supervision.

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