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  • Research & Analysis
    Research on Sliding Pressure Optimization Technology for Thermal Power Plant
    Zhu Yu, Li Qianjun, Li Debo, Feng Yongxin, Liao Hongkai, Hu Yong
    2021, 35(6): 375-379. https://doi.org/10.19806/j.cnki.fdsb.2021.06.001
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    In a power plant, long-term deviation of the unit load from the design condition leads to high energy consumption of steam turbine under low load conditions. Optimization test of existing sliding pressure operation method was carried out. By using a test method based on combined load and valve position, the most economical sliding pressure operation mode of the unit was exactly found out. At the same time, considering the influence of thermal parameters and thermal system changes on the sliding pressure operation curve of the unit, the optimal sliding pressure operation method based on the regulating stage pressure was adopted to ensure that the unit always operates under the optimal economic condition. The results show that the new optimization technology for sliding pressure operation effectively reduces the energy consumption level of the unit, and realizes the safe and economic operation of the unit under variable working conditions.
  • Research & Analysis
    Numerical Analysis of Exothermal Characteristics of Mobile TES with Basalt Melt
    Jin Yihao, Kuang Rao, Zhu Huijun, Liu Guangpeng
    2021, 35(6): 380-384,390. https://doi.org/10.19806/j.cnki.fdsb.2021.06.002
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    A kind of basalt melt was proposed as sensible material for mobile thermal energy storage (TES) to meet the requirements of high heat storage density and stable exothermal performance for a long time, here, a new type of basalt melt with high heat storage density up to 800 MJ/t was selected as the sensible material for mobile TES. The exothermic characteristics of the basalt melt was studied via numerical simulation, the thermocline behavior of fluid and solid under the influence of inlet air velocity and feature size was analyzed, and the corresponding exothermic power, exothermic time and exothermic efficiency were reported. Results show that when the initial heat is 364.9 MJ and the inlet flow velocity is 4 m/s, the basalt melt can provide thermal power of 18 kW for about 0.57 h or 10 kW for about 1.14 h, and the exothermic efficiency is more than 85%.
  • Research & Analysis
    Optimization on Velocity Field and Ash Concentration Field in Flue Gas Duct Critical Sections of SCR Denitration System
    Wang Chao, Wei Hongqi, Hu Shanmiao, Sha Yuanchao
    2021, 35(6): 385-390. https://doi.org/10.19806/j.cnki.fdsb.2021.06.003
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To solve the problem of the disorder velocity field, ash accumulation and wear of the flue gas duct in selective catalytic reduction (SCR) denitration system of a 350 MW power plant, comparisons and analyses were conducted on the velocity field and the ash concentration field before and after optimization by numerical simulations with following schemes, such as optimizing the guide plates in the extended section of the horizontal flue gas duct, adding the guide plates in the corner above the rectifying grille, and adjusting the number, length and tilt angle of the guide plates in above two critical sections. Results show that the velocity distribution and the ash concentration distribution both can be improved by adjusting the number, length and tilt angle of the guide plates. After taking the optimum scheme, the total pressure loss of the flue system is decreased by 129 Pa, or 17.7%, which presents a significant optimization effect.
    • Nuclear Technology
  • Nuclear Technology
    Effect of Sediment Distribution on Heat Transfer Performance of Steam Generator
    Chu Yingjie, Liu Haitao, Chen Ziqiang, Luo Wei, Wu Jiangtao
    2021, 35(6): 391-396. https://doi.org/10.19806/j.cnki.fdsb.2021.06.004
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    In order to analyze the effect of sediment on heat transfer performance of steam generator in CPR1000 nuclear power plant, control strategy was established for fouling in steam generator. Based on eddy current inspection data of heat transfer tube and spectrum analysis of sludge composition, the fouling distribution of steam generator with operation life was obtained. The source, composition and distribution of corrosion products in the secondary circuit of steam generator were analyzed, and the effect of the corrosion products distribution on the heat transfer performance of the steam generator was introduced. The results show that the distribution of corrosion products has slight effect on the heat transfer performance, and the fouling resistance method can be used to analyze the heat transfer performance of the steam generator by unified horizontal comparison.
    • Automatic Control
  • Automatic Control
    Research on Control Strategy of Steam Heat Exchanger System Based on Energy Conservation
    Hu Yuhang, Luo Tingkun, Zhu Ce, Yi Bingheng, Ke Yihong
    2021, 35(6): 397-401,419. https://doi.org/10.19806/j.cnki.fdsb.2021.06.005
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    A thermal power plant adopts steam heat exchanger system to replace the common heating scheme of direct steam temperature and pressure reduction with higher parameters, so as to realize the cascade utilization of energy. A collaborative control strategy based on energy balance is proposed, including medium pressure heating steam flow following high pressure heating steam flow mode and high pressure heating steam flow following medium pressure heating steam flow mode, so that the steam heat exchanger system can automatically control the heating steam parameters. The results show that the steam heat exchanger system can operate stably under the two heating modes, and the fluctuation of high-pressure steam temperature and medium pressure heating steam temperature at the outlet of steam heat exchanger is small during the test. The control strategy is feasible and can solve the automatic control problem of the new heating process.
  • Automatic Control
    Discussion on Human-Machine Interface Design for Heavy-Duty Gas Turbine Control System
    Zhao Yu, Jin Caobin, Jiao Cheng
    2021, 35(6): 402-406,439. https://doi.org/10.19806/j.cnki.fdsb.2021.06.006
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    According to the control requirements of heavy-duty gas turbine, the man-machine interface design system of heavy-duty gas turbine control system was put forward, the guiding principles and design specifications were formulated, the graphic design principle and human factor engineering theory were introduced in the design process, the "beauty is applicable" principle was put forward in the graphic design, and the amenity principle and crisis management were put forward in human factor engineering. In addition, the design of static icon and dynamic icon was introduced. Taking a typical man-machine interface design as an example, the application of the design system in the man-machine interface design of autonomous heavy-duty gas turbine control system was introduced in detail.
    • New Energy
  • New Energy
    Steady-state Performance Test Method for Utility-scale Parabolic Trough Solar Power Plant
    Liu Jingfan, Yao Xiaolin, Shi Yanzhou
    2021, 35(6): 407-413. https://doi.org/10.19806/j.cnki.fdsb.2021.06.007
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    Taking the utility-scale parabolic trough solar power plant as the research object, the research was carried out on the test conditions, test boundary parameters, test instruments, calculation and correction of power generation efficiency of the whole plant, and measurement uncertainty, etc. A method of plant-wide performance test under short duration steady-state conditions was given. Combined with the example of a 50 MW utility-scale parabolic trough solar power plant, the test method was simulated and verified based on its design and operation data. Results show that the test method is practical, and the analysis of measurement uncertainty also provides a basis for improving the measurement method and improving the test accuracy in the future.
    • Environmental Technology
  • Environmental Technology
    Study on Flue Gas Water Saving Coupled with Particulate Matter Removal by Condensation-Coagulation Device
    Wang Runsheng, Kong Wei, Yang Zhiguo, Cheng Changjie, Qu Xin, Zhang Rui, Yang Linjun
    2021, 35(6): 414-419. https://doi.org/10.19806/j.cnki.fdsb.2021.06.008
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    For the wet desulfurization system in a power plant, a two-stage condensation-coagulation device was established above the demister in the desulfurization tower for the condensation of the clean flue gas after desulfurization, while the water saving effectiveness and the simultaneous removal performance of particulate matter were investigated and studied. Results show that the water in flue gas could be effectively retrieved by the condensation-coagulation device. The temperature drop of the flue gas of the first-stage condensation unit is 35 K, and the saving water mass flow rate is 29.9 t/h, while the saving water can be used as the supplying water for the desulphurization pulping; meanwhile, the temperature drop of the flue gas of the second-stage condensation unit is 1020 K, and the saving water mass flow rate is 55.9 t/h. Compared with the original desulfurization system, after adopting the condensation-coagulation device, the removal efficiencies of total particulate matter (TPM), condensable particulate matter (CPM) and filterable particulate matter (FPM) in flue gas are improved by 37 percentage points, 36 percentage points and 37 percentage points, respectively. This presents a good effect of particulate matter removal.
  • Environmental Technology
    Research on the Prediction of SO2 Concentration at the Outlet of Wet Flue Gas Desulfurization System Based on Transfer Learning
    Wang Liguang, Yun Yongbo, Zhu Baoyu, Si Fengqi
    2021, 35(6): 420-425. https://doi.org/10.19806/j.cnki.fdsb.2021.06.009
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    Taking the desulfurization system of a 600 MW unit as an object, a prediction model of SO2 concentration at the outlet of wet flue gas desulfurization system based on transfer learning was proposed. In view of the situation that the edge distribution of the characteristic parameters of the model varies under different combinations of slurry circulating pumps, a sample-weighted least squares support vector machine (LSSVM) model based on kernel mean matching (KMM) was established, and a comparison for verification with the actual running data was also conducted. Results show that the prediction accuracy of SO2 concentration at the outlet of the desulfurization system under different combination operation modes of slurry circulating pumps can be effectively improved when using the LSSVM model with sample transfer weight, and the generalization ability of the model can also be enhanced.
    • Operation & Retrofit
  • Operation & Retrofit
    Study on Optimization and Retrofit Scheme of Primary Air Rate in Boiler
    Yu Long
    2021, 35(6): 426-430. https://doi.org/10.19806/j.cnki.fdsb.2021.06.010
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    To solve the problem of the over temperature of the superheater tube wall and the low steam temperature caused by the air rate deviating from the designed value in a power plant boiler, three retrofit schemes were proposed and compared. Results show that the dry heating scheme of economizer in low temperature section has the advantages of low investment, less retrofit amount and good effect, which can effectively improve the primary air temperature and the steam temperature.
  • Operation & Retrofit
    Analysis on AGP Upgrading Effect of PG6111FA Gas Turbine
    Lu Zilong, Mao Yaping, Wu Xiaofo, Li Jin
    2021, 35(6): 431-434. https://doi.org/10.19806/j.cnki.fdsb.2021.06.011
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The specific contents of advanced heat channel (AGP) upgrading and transformation of a PG6111FA gas turbine were introduced, and its impact on the safety and economy of gas turbine and combined cycle unit was studied. The results show that the major defects such as the loss of fire detection, which affect the operation of the combined cycle unit, are solved in terms of safety. The parameters such as heat consumption rate, output power and fuel gas consumption rate of the combined cycle unit are improved in terms of economy, and the gas turbine maintenance interval can be extended.
  • Operation & Retrofit
    Experiment on a 660 MW Supercritical Opposed Firing Boiler Under Low Load
    Zhong Wei, Ma Dafu, He Xiang
    2021, 35(6): 435-439. https://doi.org/10.19806/j.cnki.fdsb.2021.06.012
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Taking a supercritical opposed firing boiler of a 660 MW unit in a power plant as the research object, experiments and researches were conducted on the low load operation without oil under 42%, 35% and 30% rated load, respectively. Results show that the boiler combustion can stay at a stable condition under all operation low loads, and the flue gas temperature of the steering chamber has no obvious downward trend, while the inlet flue gas temperature of the selective catalytic reduction (SCR) denitration system can meet the requirement of denitration. With the decrease of the load, there is no obvious change on the boiler efficiency, but both of the heat consumption of the turbine and the power supply coal consumption increase obviously, which has a serious effect on the unit economy. Under low loads, the wall temperatures are within the safe range.
  • Operation & Retrofit
    Analysis of Main Steam Parameters Choice in Waste Incineration Boiler
    Liu Chao
    2021, 35(6): 440-445. https://doi.org/10.19806/j.cnki.fdsb.2021.06.013
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Taking a medium temperature and sub high pressure (high parameter) reheat waste incineration boiler as an example, the boiler structure, initial investment cost, operation and maintenance cost, power generation income, operation safety and other aspects of the same scale medium temperature and medium pressure (medium parameter) waste incineration boiler were compared and analyzed. The results show a higher parameter mode benefits more with a larger scale, while the traditional medium parameter mode is more suitable for small and medium-sized waste incineration projects.
  • Operation & Retrofit
    Cause Analysis of High Exhaust Steam Pressure of Driving Steam Turbine of Induced Draft Fan
    Zhang Jiakuan, Zhang Youhui, Cheng Dongtao
    2021, 35(6): 446-449. https://doi.org/10.19806/j.cnki.fdsb.2021.06.014
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    A method for quantitative and qualitative analysis of influential factors on the exhaust steam pressure of driving steam turbine of induced draft fan was proposed. Analysis based on a 1 000 MW power generator unit was found that lower flow rate of cooling water and insufficient suction capacity of the vacuum pump were the mainly reasons for higher exhaust steam pressure of the driving steam turbine of induced draft fan. The improvement suggestions are proposed to offer the reference for the design and transformation of same type units and provide the ideas and methods for the cause analysis of high exhaust pressure of driving steam turbine of induced draft fan.