Bibliographic Details
| Title: |
超临界锅炉低负荷工况动态特性仿真研究. |
| Alternate Title: |
Simulation study on dynamic characteristics of supercritical boiler under low load conditions. |
| Authors: |
韩元1 hanyuan888@163.com, 朱愉洁1, 刘铠瑞2, 超, 王1,2, 王研凯1, 王利民2, 车得福2 |
| Source: |
Clean Coal Technology. 2025 Supplement, Vol. 31, p276-284. 9p. |
| Subject Terms: |
*Steam generators, *Superheated steam, *Phase transitions, *Flow velocity, *Simulation methods & models, *Electric power systems, *System dynamics |
| Abstract (English): |
In the process of building the new type power system, coal-fired power plants need to undertake the task of peak load regulation, and continuous low-load operation has gradually become the norm. The dynamic characteristics of supercritical boilers under full load conditions have been extensively studied, but little research has been done on the dynamic characteristics under low load conditions and the position of the phase transition point of the working fluid. In order to study the dynamic characteristics of the once-through boiler during deep peaking, a dynamic simulation model of supercritical once-through boiler was established in Dymola platform, and the variations of steam temperature, main steam flow rate and the position of the phase change point of the evaporation system were investigated under 50% THA load after the boiler's fuel quantity, feed water flow rate, feed water temperature and total air flow rate were perturbed respectively. The results show that when the fuel quantity, feedwater flow rate, feedwater temperature and total air flow are all step increase 5%, the changes in the main steam temperature are 46.89, -39.03, 19.74 and -6.29°C, respectively, and the response time is 2 210, 1 520, 2 180 and 710 s. Maintaining the water-to-coal ratio is still the primary task for ensuring the low load steam temperature stability, and the change of feedwater temperature is not conducive to the stability of steam temperature. The height of the evaporation section gradually increases after the increase of feedwater flow rate and total air flow, the evaporation section gradually shortens after the increase of fuel flow rate, and the evaporation section first lengthens and then shortens after the increase of feedwater temperature. Among them, the effect of fuel flow on the height of evaporation section is the most significant. Under low load conditions, the intermediate point temperature and steam flow of the once-through boiler fluctuations are more intense, which is not conducive to the safe and stable operation of the boiler, and has higher requirements for automatic control. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
在构建新型电力系统的过程中, 煤电机组需要承担调峰任务, 持续低负荷运行逐渐成为常态。 前人大量研究了超临界锅炉满负荷工况下的动态特性, 但鲜见其在低负荷工况下的动态特性与工质相 变点位置研究。为了研究直流锅炉在深度调峰期间的动态特性, 在 Dymola 平台中建立了超临界直流 锅炉的动态仿真模型, 在 50% THA 负荷下研究锅炉燃料量、给水流量、给水温度与总风量分别发生扰 动后蒸汽温度、主汽流量与蒸发系统工质相变点位置的变化规律。结果表明, 当燃料量、给水流量、给 水温度和总风量均阶跃增大 5% 时, 主蒸汽温度的变化幅度分别为 46.89、–39.03、19.74 和−6.29 ℃, 响应 时间分别为 2 210、1 520、2 180 和 710 s, 维持水煤比仍是保证低负荷汽温稳定的首要任务, 给水温度发 生变化不利于汽温的稳定。给水流量和总风量增大后蒸发段高度逐渐增大, 燃料量增大后蒸发段逐渐 缩短, 给水温度增大后蒸发段先延长后缩短, 其中燃料量对蒸发段高度的影响最为显著。低负荷工况 下, 直流锅炉中间点温度与蒸汽流量波动更为剧烈, 不利于锅炉的安全稳定运行, 对自动控制的要求 更高. [ABSTRACT FROM AUTHOR] |
| Database: |
Energy & Power Source |
