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    Research & Analysis
  • Research & Analysis
    Effects of Coal Ash with Different Particle Sizes on Ash Deposition and Sintering Characteristics of Zhundong Coal
    Xiao Xiong, Pan Haoxiang, Lü Weizhi, Yu Dunxi
    2023, 37(4): 207-211,216. https://doi.org/10.19806/j.cnki.fdsb.2023.04.001
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The ash deposition from the combustion of Zhundong coal can be alleviated with the addition of kaolin, while the cost of the method is high. Taking the Zhundong coal ash with different particle sizes as the additives, combined with the ash deposition experiment in a drop tube furnace and the sintering experiment in a fixed bed furnace, an evaluation was conducted on the control effect of ash deposition of Zhundong coal ash with different particle sizes. Results show that the composition and the mineral distribution of Zhundong coal ash with different particle sizes are distinct, and the content of silicon-aluminum minerals such as mullite in coal ash of more than 100 μm is significantly higher than that in the coal ash of other sizes. The ash depositon on the heat exchange surface is easily to be removed with the the addition of coal ash of more than 100 μm, however, the coal ash of less than 50 μm not only could not prevent the development of deposition, but also could aggravate the removal difficulty of the deposited ash. The less removal difficulty of the deposited ash on the heat exchange surface is mainly caused by the weaker sintering with the addition of coal ash of more than 100 μm.
  • Research & Analysis
    Analysis of the Influence of Variable Load on Fatigue Life of Economizer Inlet Pipeline Structure in a Thermal Power Unit
    Jin Chuanling, Wan Yu, Xu Jiaju, Lin Shaochen, Shi Renqiang, Gao Yan
    2023, 37(4): 212-216. https://doi.org/10.19806/j.cnki.fdsb.2023.04.002
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Researches were conducted on the influence of the variable load on the fatigue life of the economizer inlet pipeline structure in a 600 MW thermal power unit, the relationship between strain and fatigue life was obtained through following three methods, such as material tensile test, fatigue test, and numerical simulation method. Results show that, the fatigue life of material tensile test is quite different from that obtained by fatigue test, while the fatigue life of numerical simulation method is in accordance with that of fatigue test. The fatigue performance of the structure can be reasonably evaluated by numerical simulation method, while the life loss of the structure significantly increases with the increase of the change range of the unit load.
  • Research & Analysis
    Research on Multi-attribution of Comprehensive Energy System in Zero Carbon Emission Park
    Ma Chaofan, Yan Quanzhi, Shao Jiaxing, Chang Cheng
    2023, 37(4): 217-222. https://doi.org/10.19806/j.cnki.fdsb.2023.04.003
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    A zero carbon emission energy system was established for a civil comprehensive park with various business types, and the energy storage system was used to coordinate the matching between the self-generation supply power and the park demand power. The energy flow of the cooling and heating equipment was analyzed under the system working condition, and the dynamic model of the equipment was established. The system performance was evaluated with the analysis of indicators such as the primary energy saving ratio and the carbon dioxide emission reduction ratio, and with the research of the flexibility of the park after energy storage scheduling. Results show that the primary energy saving ratio and the carbon dioxide emission reduction ratio of the energy system change from 33.0% to 100.0% and from 22.7% to 100.0%, respectively. The goal of zero carbon emission can be achieved when the supplementary power is fully matched with the nearby green energy power such as wind energy and solar energy.
    • New Energy
  • New Energy
    Review of Icing Mechanism and Anti-icing/De-icing Techniques for Wind-generator Set Blade
    Ni Yifan, Zhang Zuogui, Fu Rui
    2023, 37(4): 223-229. https://doi.org/10.19806/j.cnki.fdsb.2023.04.004
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To solve the problem that the blade icing occurs normally in many wind farms constructed in domestic northern and southern-central area during winter operation, the blade icing mechanism of the wind-generator set was discussed, while the advantages and disadvantages of types of anti-icing and de-icing techniques were compared and analyzed in detail. Results show that the combined scheme of anti-icing with coating and active de-icing has high application potential, which can ensure the safety and high efficiency of the wind-generator set operation.
  • New Energy
    Discussion and Outlook on the Development of Solar Thermal Power Generation Technology
    Yang Qianpeng, Zhu Haofei, Chen Boxu, Meng Xiangfei
    2023, 37(4): 230-237. https://doi.org/10.19806/j.cnki.fdsb.2023.04.005
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    During the 14th Five-Year Plan period, the technology research and the industry application of the solar thermal power generation would have a rapid development. By summarizing the basic profile and industry status of the solar thermal power generation domain, researches and analyses were conducted on the system form, the subsystem technology and corresponding advanced technologies of the solar thermal power generation, while the outlook was carried out for the prospect of the solar thermal power generation technology based on the levelized cost of electricity and the installed capacity.Through analysis, for the development route of the solar thermal power generation during the 14th Five-Year Plan period, the key tower solar thermal power generation technologies should play a main role, and technologies such as the key equipment, the thermal storage media and the control software should get a breakthrough, while the disc solar thermal power generation technology and the distributed solar thermal power generation technology need a balanced development. The industrial route should focus on promoting the scale expansion and the commercialization of the tower solar thermal power generation, while should give consideration to the development and application of distributed solar thermal power generation products, and the multi-energy complementation and multi-generation application of the solar thermal power generation.
  • New Energy
    Selection Analysis of PV Module and Inverter in Rooftop PV Power Station
    Sun Tao, Li Guangwei
    2023, 37(4): 238-242. https://doi.org/10.19806/j.cnki.fdsb.2023.04.006
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Taking the construction of a rooftop photovoltaic (PV) power station as a research example, the power generation capacity of the station under the local climatic conditions was calculated theoretically, while the construction scheme of the rooftop PV station was put forward, including the type selection of the PV module, the selection of the inverter capacity and the corresponding connection method, the design of the PV array, etc. The proposed scheme not only has good environmental and social benefits, but also has certain economic benefits. This may serve as a reference for the construction of rooftop PV power stations.
    • Nuclear Technology
  • Nuclear Technology
    Analysis on the Repair Technology for Nickel-based Weld Stress Corrosion Cracking in Nuclear Power Plant
    Zheng Donghong, Chen Xiaohai, Li Jiahua, Gong Shengjie
    2023, 37(4): 243-247,252. https://doi.org/10.19806/j.cnki.fdsb.2023.04.007
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To solve the problem that the stress corrosion cracking of the nickle-based weld normally occurs with the primary circuit coolant in pressurized water reactor nuclear power plants during operation, identifications, analyses and discussions were conducted on following repair technologies according to ASME BPVC standards, such as flaw removal, piping butt weld overlay, piping butt weld inlay or onlay, J groove weld embedment, J groove weld internal mid-wall surface repair, J groove weld outer surface pad repair, and J groove weld mechanical seal repair. This may serve as a reference for the repair technology selection of the nickle-based weld in nuclear pressure vessels.
  • Nuclear Technology
    Analysis on Stress Corrosion Crack Propagation Life of Low-pressure Impeller Blade Root Groove in Nuclear Power Unit Steam Turbine
    Li Siqi, Yang Yu, Li Xiaopin, Wang Jinhua, Pan Qiang, Wang Jun
    2023, 37(4): 248-252. https://doi.org/10.19806/j.cnki.fdsb.2023.04.008
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Analyses were conducted on the mechanism of stress corrosion and the cause of stress corrosion crack propagation of the steam turbine low-pressure impeller in nuclear power units, and the calculation model for stress corrosion crack propagation life was established combined with Clark model and Pairs model in the corrosion environment. Taking the second and third stage impeller blade root grooves of the low-pressure steam turbine in a nuclear power unit as the research object, the propagation life of stress corrosion crack was researched and analyzed. Results show that the crack propagation life calculated according to the stress corrosion crack propagation rate with the two models can meet the requirement of the service life (60 years ) of the serviceable part of the steam turbine in nuclear power units. The crack propagation life from Pairs model is more conservative than that from Clark model, and the safety factor can be selected within 2-3 when estimating the crack propagation life with Clark model, while the change of temperature has a significant influence on the crack propagation rate with Clark model.
    • Automatic Control
  • Automatic Control
    Research and Application of DR Detection System for Water Wall Climbing Robot Based on Remote Control
    Liu Jincheng, Tang Bin, Ma Yaoqing
    2023, 37(4): 253-258. https://doi.org/10.19806/j.cnki.fdsb.2023.04.009
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To solve the problem that the boiler water wall tube inspection in power units with scaffolding or lifting platform has a high safety risk and huge cost, a digital radiography (DR) detection system for water wall climbing robot based on remote control was researched and developed with the combination of X-ray flaw detection machine, DR Plate detector and automatic wall climbing robot, while a field DR detection of water wall tube was carried out in a 300 MW coal-fired power unit. Test results show that the detection system has a reliable stability, convenient usability and accurate positioning. This may realize the real-time detection of defects online, and improve the speed and efficiency of detection significantly.
    • Operation & Retrofit
  • Operation & Retrofit
    Retrofit and Application of Heating Capacity Improvement in a 1 000 MW Thermal Power Unit Under Deep Peak Regulation
    Sun Deyu, Wang Xiaoxiao, Li Yingzhi, Guo Guangwei, Fan Chenghao, He Xiang
    2023, 37(4): 259-263. https://doi.org/10.19806/j.cnki.fdsb.2023.04.010
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To solve the problem that the exhaust steam from the back pressure steam turbine (BPT) can not enter into the heating header with the decreased pressure in a 1 000 MW thermal power unit under deep peak regulation condition, a retrofit was conducted on the exhaust steam of the BPT by adding the extraction pipeline from the high temperature reheater steam tube, while the heating capacity of the unit was analyzed and calculated with different opening degrees of the intermediate pressure (IP) control valve. Results show that, with the improved pressure of the high temperature reheater by decreasing the opening degree of the IP control valve, the BPT can operate safely and continuously under deep peal regulation condition. Additionally, the heating capacity is improved by extracting steam from the high temperature reheater. When the unit load reduces to 350 MW, the mass flow of the heating extraction steam can reach at 115 t/h with the heating steam pressure of over 1 MPa and the heating steam temperature at around 320 ℃.
  • Operation & Retrofit
    Analysis and Retrofit of Coking in a 300 MW Tangentially Fired Boiler
    Chen Anhe, Chen Jinshun, Lin Zonghe, Zhang Xiaoyong, Zhu Xianran, Wang Xi
    2023, 37(4): 264-268. https://doi.org/10.19806/j.cnki.fdsb.2023.04.011
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    For a 300 MW thermal power unit, to solve the problem of the coking occurring in the tangentially fired boiler with coal blending, tests were conducted on the unit, and the combustion system was optimized and retrofitted. Test results show that the decrease of the coal mill output is caused by the the small area of the primary air nozzle, which leads to the coking of the water wall. Through improving the coal mill output with the decrease of the primary air velocity, the boiler load can be increased, while the concentration of the reducing atmosphere near the furnace wall can be decreased. The retrofit has a good effect, which can serve as a reference for the solution of the problem in similar units.
  • Operation & Retrofit
    Analysis and Prevention of Tube Explosion of the Platen Superheater in a 350 MW Subcritical Boiler
    Guan Huai, Wang Jian, Wang Zhihao, Bai Yunfeng, Ai Fangxing, Qu Chen, Wang Haiying, Li Qingpeng
    2023, 37(4): 269-272. https://doi.org/10.19806/j.cnki.fdsb.2023.04.012
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To solve the problem of the tube explosion of the secondary platen superheater in a 350 MW sub-critical coal-fired power plant, analyses were conducted on the tube explosion reason with the macro-morphology observation of the burst, the hardness measurement, the logic analysis of the attemperating water for superheater, etc. Results show that the tube explosion is caused by the short-term overtemperature of the superheater tube, which is resulted from the water plug of the superheater. The tube explosion possibility of the platen superheater can be reduced through optimizing the logic the of the attemperating water for superheater and formulating multi-level preventive measures. This may ensure the safety and stability of the unit operation.
  • Operation & Retrofit
    Analysis and Countermeasure for the Shafting Fault of Booster Fan in a Coal-fired Power Plant Flue Gas Desulfurization System
    Liao Guoquan, Li Jiao, Zhang Wenlong
    2023, 37(4): 273-276. https://doi.org/10.19806/j.cnki.fdsb.2023.04.013
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    For the No. 5 boiler flue gas desulfurization system of a coal-fired power plant, to solve the problem of the frequent shafting fault of the booster fan after the operation mode changing from the fixed frequency operation to the variable frequency operation, by comparing the working conditions before and after the frequency conversion retrofit of the booster fan, and combining the change of the fatigue safety factor of the booster fan shafting, it is found that the shafting fault is mainly caused by the increased alternating stress and inertial force during the variable frequency operation, which leads to the fatigue safety factor of the booster fan shafting is lower than the design value under the variable frequency operation. Through the reinforcing retrofit for the impeller, the long and short shaft, the coupling and other parts of the shafting with checking, the existed fault can be effectively solved and the reliability of the equipment can be improved.