二次再热机组二段吹管方法的选择

Highlights the internal cleanliness inspection after blowpip of eultra supercritical boilers

二次再热锅炉因增加一级再热器,点火吹管时系统更加复杂,过热器系统蓄热量明显不足,导致目前国内大部分二次再热锅炉吹管时都选择分阶段降压吹管,少部分锅炉选择稳压吹管。目前国内大部分超超临界机组都采用降压吹管法,此方法更加适合国内机组的基建情况。本文以某超超临界二次再热机组为例,分析二段降压吹管法中的最优法。最后表明利用一次再热器进行蓄热的方法即能提高吹管的效果又能降低吹管方案的实施难度,是其中的最优选,而且此思路也能给高效超超临界的吹管带来借鉴和参考意义。

Due to the addition of a first-stage reheater in the secondary reheat boiler, the system is more complicated when the tube is fired and the heat storage capacity of the superheater system is obviously insufficient, which leads to the choice of step-down tube blowing in most of the secondary reheat boilers in China at present, a small number of boilers choose steady-pressure tube blowing. At present, most of the ultra-supercritical units in China adopt the method of reducing pressure to blow pipes, which is more suitable for the capital construction of domestic units. Taking an ultra-supercritical secondary reheat unit as an example, this paper analyzes the optimum method of two-stage pressure-reduced tube blowing method. Finally, it is shown that the method of heat storage by primary reheater is the best one, which can not only improve the effect of blowing but also reduce the difficulty of implementing the scheme, moreover, this idea can also be used for reference and reference for the high-efficiency ultra-supercritical blowpipe.