Integrated Intelligent Energy

A power plant coalfired boiler flue gas system resistance improvement and analysis

LIU Wen

2016, 38(11): 1-3.

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Abstract:After analyzing a power plant’s 300MW unit subcritical boiler flue gas system, combined with ultralow emission reconstruction, an improvement plan was indicated. By electrostaticbag precipitator extend, media gasgas heater improvement, fan collection and system resistance improvement, existing flue gas system resistance was reduced. Besides fulfilling environment protection requirement, the power consumption was reduced.

Nondestructive testing of alloy bearing for in service turbo generator

WANG Lei, XIONG Shihao

2016, 38(11): 4-6.

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Abstract:At first, this paper discusses the nondestructive testing method of alloy bearing for common inservice turbo generator. And after that, it compared the strengths and weaknesses of ultrasonic testing and penetration testing technologies according to the structural features of bearing and the characteristics of defects. At the end of this paper, it describes the practice applications of the two technologies in bearing testing.

Nuozhadu Hydropower Plant utility type unit top cover water sample experiment

LI Zheng, YAN Xiang, WANG Xuanfan

2016, 38(11): 7-10.

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Abstract:Take Huaneng Lancangjiang Hydropower Company Limited Nuozhadu Hydropower Plant as an example, the method to take water sample from hydropower plant utilitytype unit top cover was indicated. Difficulties during experiment was overcome. Which could be referred by similar experiment.

Development and application of multifunctional integrated sample preparation vehicle

CHEN Wei

2016, 38(11): 11-12.

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Abstract:When preparing multiple coal samples in one sample preparation room, it is easy to cause samples mixing. In order to solve the problem, a multifunctional integrated sample preparation vehicle (unit) is developed. This vehicle could absorb, optimize and integrate the numerous fragmented elements at sample preparing spot, and make a centralized management of many issues in one sample preparing process, such as store，the label writing and pasting of prepared sample. And it makes the sample preparation order more clear and avoids the samples mixing to the maximum.

Reason analysis of large temperature measuring deviation of transformer and its treatments

ZHAO Tieying1,HE Yonggang2

2016, 38(11): 13-14.

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Abstract:A transformer is an important facility in the power system and its operation temperature should be continuous monitored. For the large temperature measuring deviation problem of some temperature measuring devices on the transformer and taking the main transformer of a certain power plant as an example, this paper conducted a temperature measuring comparison test on three common temperature measuring devices. It pointed out that the cause of temperature measuring error was the insensitivity of mechanical thermometer and proposed corresponding installation adjustment measures.

Analysis and optimization of thermal protection system reliability of circulating fluidized bed boiler

HAN Xinjian1,HAN Xinchun2

2016, 38(11): 15-17.

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Abstract:The circulating fluidized bed (CFB) boiler is inherently different from the pulverized coal boiler in combustion mode. Combining with the characteristics of CFB boiler, this paper analyzes and summarizes the measurements of improving the thermal protection system reliability of CFB boiler and optimizes the corresponding thermal protection logic, which effectively improves the accuracy and reliability of thermal protection of CFB boiler.

Effect of thick side reverse tangent angle on thermal state tangent circle principle study

WANG Chengliang, LI Qihao

2016, 38(11): 18-20.

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Abstract:Methods to solve the problem for horizontal shading burner thick side improper reverse angle design to hot stage tangential diameter, boiler coking and unstable combustion problem, the mathematical way of combining theoretical calculation and field test are studied, the basic methods of master level shade burner thick side angle of boiler hot state principle and regularity of the influence of tangential diameter, namely using a strong side wind methods of technology, hot tangential diameter will be smaller than the diameter of a theoretical calculation, and the strong side methods of angle, the greater the thermal state tangential diameter will be more than the theoretical calculation of diameter decreases. This study not only for low nitrogen combustion system but also improve the boiler combustion adjustment and accumulated experience, and successfully for boiler is optimized.

STM32based transformer air cooling control system improvement

WU Xuezheng, HUANG Yiran

2016, 38(11): 21-23.

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Abstract:At present, transformer air cooling control system usually adopted programmable logic controller(PLC)or digital signal processor(DSP).With the development of STM32 series chips, and at low prices become the important elements in the field of automatic control. Referred existing transformer air cooling control system, the control system based on STM32 chips was designed. Features such as pulsewidth modulation(PWM)soft start, differential margin start/stop, fans grouped start/stop and load and temperature start/stop and failure protection were added. Transformer air cooling control system was improved.Air cooling system reliability and durability was increased.

Coalfired power plant boiler slagging online surveillance and diagnostic technology research status

CUI Heng

2016, 38(11): 23-25.

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Abstract:While coal fired power plant boiler operating, furnace water wall slagging is one of the main threats to boiler operation. Recent years, there are many ways to diagnostic and surveillance of slagging. This paper introduced the status of furnace slagging diagnostic and surveillance.

Apply deep pulverizer RB test improve 660MW unit FCB water supply control strategy

LIN Yizhan

2016, 38(11): 26-29.

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Abstract:The difficulties of water supply in FCB was analyzed. The feasibility of water supply control strategy in FCB by using deep pulverizer in RB was verified.The water supply control strategy of single steam pump in FCB was indicated. Related water supply control circuit was improved and verified by test. Result proved the feasibility of control strategy improvement.

Power plant auxiliary power system electronic switch type harmonic source analysis

LI Hu

2016, 38(11): 30-34.

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Abstract:With more and more electronic switches were applied in plant auxiliary power system, harmonic pollution was inevitably produced. Took four kinds of electronic switch type harmonic source into consideration, theoretical research and simulation analyze was taken. The effect of harmonic source to busbar was simulating analyzed based on a power plant’s 6kV plant auxiliary power system. The result indicated that due to small capacity and selffiltering, harmonic source will not affect busbar.Test verify proved the theory and simulation.

Application of boiler accurate balancing and improvement technology based on new type air & powder online monitoring system

Lü Hongbiao1，NIE Tao2，HUANG Xiaobin3，LIANG Longfei4

2016, 38(11): 35-37. doi:

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Abstract:For a long time, the application of primary air and powder accurate measurement and control in power plants is very limited. Therefore, the adjustment of air and powder is very extensive, and limited the combustion performance. Take Luyang power plant boiler No.1 as example, introduced the new type accurate air and powder measure system, airpowder balance adjustment .Accurate boiler pulverizing adjustment and balance combustion was fulfilled. CO production was reduced. CO, NOxand O₂uniformly distributed in combustor. It played an important role in the operation of the system, energy saving and emission reduction. 

Power plant mill exhauster main shaft breakage cause analysis

LI Yanjun, NIU Baoxian

2016, 38(11): 38-39.

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Abstract:A power plant’s No.9 boiler No.1 mill exhauster main shaft was broken. By appearance inspection, widmanstatten structure, caused by overheat, was found at the sections varied area. Thus, the main reason caused breakage was determined that crack generated at sections varied area by concentrated stress while main shaft operating. Creaks extended gradually, and finally caused breakage.

PZQ2600 type attached selfelevating tower crane underframe structure finite element analysis

SUN Qiuxiang

2016, 38(11): 40-41.

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Abstract:Take the underframe of PZQ2600 type tower crane as analyze object, 3D model was built in Creo and output into finite element analysis software Workbench. Finite element analysis was taken. Which provided a design method for tower crane underframe structure. 

Power plant boiler firing device improvement

DU Yuchao

2016, 38(11): 42-44.

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Abstract:Summarize and analyze the problems of existing boiler layer A plasma firing system, and indicate that additional layer of plasma firing system onto existing firing system will provide better operation and maintenance performance. This improvement ensure the reliability of firing system during boiler start. Furthermore, less maintenance difficulty remarkably increased equipment and system usage ratio.

Influences of distributed control system transformation on the economic operation of supercritical unit

GAO Ruibin, XU Yao

2016, 38(11): 45-47.

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Abstract:In order to improve the operation safety and economy of unit, a distributed control system (DCS) optimal transformation of supercritical unit boiler of a certain power plant is conducted. Through comparing and analyzing the one year operation data and the test data of preboiler coal quality, fly ash and slag before and after the DCS transformation, and analyzing the influences of changing main operation parameters on coal consumption of power unit using heat deviation analysis, this paper comprehensively evaluated the influences of boiler DCS transformation on the economic operation of unit under different preboiler coal quality conditions and operation loads. And it provided an economic and feasible method to evaluating the quantitative influences of DSC transformation on the economic operation of unit.

Brief of protection against cold and freezing conditions for power plant in South China

HAN Feng

2016, 38(11): 48-49.

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Abstract:Based on the specialty of power plants in South China, this paper summarized the experience of protection against cold and freezing conditions, and systematically expound the measurements against cold and freezing conditions and following improvement measurements.

670MW unit sealing heater fan shaft vibration cause analysis and treatment

QU Jie, LI Shijun

2016, 38(11): 50-51.

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Abstract:Based on the incident of serious vibration of Huadian Weifang Power Plant’s unit No.4 and 4B shaft, by analyzing vibration data, it was concluded that the sealing heater fan shaft is rotating unbalance. After counterbalance was added on fan impeller top according to balance calculation, the problem of serious vibration was solved. Which could be refer by similar unit.

DEH upper computer postimprovement debugging and operation steps

CAO Baowen

2016, 38(11): 52-54.

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Abstract:To ensure safety, reliability and flexibility, steam turbine usually controlled by DEH (digital electrohydraulic control system). Due to the existing upper computer of DEH is already off the market, the upper computer needs an upgrade. Introduce and explain the postimprovement debugging and preparation, which could be refed by similar project.

Coal fired unit ultra low emission environment protective facilities control and instrumentation summarizing

NI Xinyu

2016, 38(11): 55-59.

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Abstract:Coal fired power unit ultra low emission standards and the improvement plan has been clear in the 13th Five Year Plan Under the background of accelerating environment protective facilities construction, based successful experience, denitration, dust removal and desulfurization facilities and comprehensive control, control strategy, flue gas pollutant concentration measurement technology was summarized.

Desulfurized stack anti corrosion reconstruction design and material selection

WANG Jie1, QIU Zhibin2, WANG Heng1, YUAN Lin2, YANG Lin2

2016, 38(11): 60-63.

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Abstract:Under the more and more strict environmental protection requirement, power plants are stepping forward on the flue gas environmental facilities reconstruction. Completely remove bypass flue, forward lead or remove gasgas heater or add wet electrical static precipitator, any kind of these reconstructions will change the stack operating condition. By combined theoretical analyzing and lab test, stack operating condition under the new circumstance was analyzed. Authors indicated that even though the stack operating condition is getting batter, the corrosion condition is still very serious. Stack anticorrosion is still very important. A few kinds of problematic stack anticorrosion technologies were analyzed. Suggestions for stack anticorrosion reconstruction design, material selection and construction implementation under the new circumstance were provided.

Wet desulfurization coalfired unit “white smoke plume” energy saving treatment

WANG Guiyan1, HUANG Suhua2

2016, 38(11): 64-65.

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Abstract:Psychrometric chart analysis was used to study the wet desulfurization process of coalfired units chimney exports tend to form “white smoke plume” reason, pointed out that at present although direct heating method is generally used to eliminate the “white smoke plume”, but will increase the run of unit energy consumption, and finally put forward by condensation and then heating process is governance “white smoke plume” effective energy saving measures.

Thermal power plant coal handling system dust comprehensive treatment and practice

LI Hexiang

2016, 38(11): 66-68.

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Abstract:Large quantity of coal is consumed while thermal power generating electricity. Dust usually generated while coal load, unload, store, transfer, crash, screen and other process. Dust would be harmful for human beings and would make damage to equipment if it was not treated properly. After analyzing dust causes, specific treatment was taken. The result was well proved. Which can be refer for solve coal handling system dust problem.

Effect of tertiary air layout to boiler outlet oxynitride emission

ZHOU Yangjun

2016, 38(11): 69-71.

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Abstract:The tertiary air of vent pulverized coal handling system has high total air flow, high humidity, low coal density and low temperature. Its layout will impact boiler combustion, fly ash and NOxemission. Based on different lownitrogen combustion improvement cases, effect of tertiary air layout to boiler outlet oxynitride emission was analyzed. The improvement plan of pulverized coal tangentially fired boiler was indicated, which could be referred by similar project.

Simulation analysis of draught fan fault for waste heat utilization system of a certain gas turbine power plant

LIU Yubin1, YANG Bo2, MIAO Sen3, CHEN Yaobin1, KONG Fei1

2016, 38(11): 72-75.

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Abstract:When the draught fan fault of waste heat utilization system occurs, the flue gas could not be discharged through normal system and it need open the flue gas damper of waste heat boiler quickly. In addition, the abnormal discharge of flue gas may lead to the variation of back pressure at gas turbine outlet, and then trigger the back pressure protection of gas turbine. Based on the established physical and mathematical models, this paper evaluated three operating conditions of full fault, semi fault and unit fault of draught fan, and pointed out that the unit fault had little influence on the whole system. If the flue gas damper of waste heat boiler is opened in 15 seconds, the back pressure at gas turbine outlet could be kept normal basically.

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