精对苯二甲酸余热利用汽轮机高效通流开发

Development of High Efficiency Flow Path in Heat Recycle Steam Turbine for Purified Terephthalic Acid Plant

精对苯二甲酸(PTA)装置余热利用汽轮机可以有效回收反应余热,降低装置耗能,提高企业竞争力。介绍了某PTA装置余热利用汽轮机的设计难点及通流精细化设计过程,该机组具有1路主汽和3路补汽,4路汽源均为低压饱和蒸汽,汽轮机额定功率为51.5MW,单机功率为国内最大。重点介绍了汽轮机进汽方式选取、高效通流叶片设计、进补汽腔室设计、排汽蜗壳回收、去湿措施应用等,以上一系列精细化设计使该机组性能超过保证值3.5%。性能验收试验结果表明,该机组性能比保证值高3.1%,与设计值较吻合。研究成果可为大型余热利用汽轮机的研发提供参考。

The waste heat of reaction can be recycled by the steam turbine in purified terephthalic acid(PTA) plant to reduce the energy consumption and improve the competitiveness of enterprises. The design difficulties and flow refinement design process of a heat recycle steam turbine for PTA plant are presented. This unit has one main steam and three supplementary steam, and these four steam sources are all low pressure saturated steam.The rated power of the turbine is 51.5 MW, which is the maximum capacity in China. The features such as design of intake mode, high efficiency blades, intake and supplement chambers, exhaust volute, and the application of moisture removal measures are mainly demonstrated. The above refined design can make the performance of the unit exceed the guaranteed value by 3.5%. The result of performance test shows that the performance of the unit is 3.1% higher than the guaranteed value, which is in good agreement with the design value. The research results can provide reference for research and design of the large waste heat recycle steam turbines.