Transient analysis of attemperator enthalpy balance based on the commissioning data of a coal-fired steam power plant

Uruno, Yumi; Choi, Geunwon; Sung, Minjun; Chung, Jihoon; Kim, Hyojun; Lee, Kihyun

doi:10.1016/j.applthermaleng.2019.01.047

Cited by 3 publications

(2 citation statements)

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“…Power plant operators have implemented several measures to respond to the load-regulating requirements of power grids, including the reduction of low-load operation and continuous operation at an off-design point [16]. However, due to the nonlinearity of the boiler-turbine system, rapid changes in the generating load of a coal-fired power unit, such as during loading, de-loading, or ramping, may result in fluctuations in steam temperature, causing negative impacts on other parameters and reducing overall flexibility and thermal performance [17]. Therefore, it is crucial to enhance the ability to adjust load variation in a swift, safe, and high-efficiency manner for coal-fired power plants, especially given the high penetration of renewable energy in power systems.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of a 300 MW Coal-Fired Power Unit during the Transient Processes for Peak Shaving

et al. 2023

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A simulation model based on Dymola modelling was developed to investigate the dynamic characteristics of automatic generation control (AGC) for variable-load thermal power units in this study. Specifically, a 300 MW unit from a power plant in northern China was used to verify the model’s validity in steady-state processes and to analyze the behavior of the main thermal parameters under different rates of load changes. The economic performance of the unit under different rates of load changes is also analyzed by combining the economic indexes of “two regulations” in the power grid. Results indicate that as the rate of load changes increases, boiler output, main steam temperature, reheat steam temperature, main steam pressure, and working temperatures of various equipment fluctuate more intensely. Specifically, at a rate of load reduction of 2.0% Pe MW/min, the maximum deviation of the main steam temperature can reach 7.6 °C, with the screen-type superheater experiencing the largest heat exchange. To achieve a balance between safety and economics for the unit, the rate of load raising should not exceed 1.2% Pe MW/min, and the rate of load reduction should not exceed 0.8% Pe MW/min. This paper applies the covariance index and AGC assessment index of the thermal power unit load control system to the established dynamic simulation model to supplement the AGC assessment index in the “two regulations”, and to provide a flexible and reasonable system evaluation result for field operators to refer to, so as to improve the economics of the system on the basis of safety.

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Section: Introductionmentioning

confidence: 99%

Performance Analysis of a 300 MW Coal-Fired Power Unit during the Transient Processes for Peak Shaving

et al. 2023

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“…Yine aynı isimler, bu yıl (2019) içerisindeki yeni çalışmalarında atemperatörün entalpi dengesini süreksiz (zamana bağlı) analiz ile değerlendirmişlerdir. Bu analiz bulguları neticesinde kararsız akış modelinin kararlı akışa oranla soğutma suyu debisinin tayininde daha etkili olduğunu ve sonuç olarak soğutma suyu debisinin bu metodla kızgın buharın istenilen oranda "geri kızdırılıp kızdırılmadığı" sonucunu net şekilde tayin etmede kullanılabileceğini ortaya koymuşlardır [11]. Tüm bu kaynak çalışmalar atemperatörün kontrol sistemi ile veya içyapısındaki değişim ve gelişimlerle ilgilenmiştir.…”

Section: Gi̇ri̇ş (Introduction)unclassified