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    马芳芳, 熊达, 孙铁栋, 欧阳福生. 乙烯装置裂解气压缩机性能预测模型研究[J]. 华东理工大学学报(自然科学版), 2021, 47(2): 177-182. DOI: 10.14135/j.cnki.1006-3080.20191226002
    引用本文: 马芳芳, 熊达, 孙铁栋, 欧阳福生. 乙烯装置裂解气压缩机性能预测模型研究[J]. 华东理工大学学报(自然科学版), 2021, 47(2): 177-182. DOI: 10.14135/j.cnki.1006-3080.20191226002
    MA Fangfang, XIONG Da, SUN Tiedong, OUYANG Fusheng. Performance Prediction Model for Cracking Gas Compressor in Ethene Unit[J]. Journal of East China University of Science and Technology, 2021, 47(2): 177-182. DOI: 10.14135/j.cnki.1006-3080.20191226002
    Citation: MA Fangfang, XIONG Da, SUN Tiedong, OUYANG Fusheng. Performance Prediction Model for Cracking Gas Compressor in Ethene Unit[J]. Journal of East China University of Science and Technology, 2021, 47(2): 177-182. DOI: 10.14135/j.cnki.1006-3080.20191226002

    乙烯装置裂解气压缩机性能预测模型研究

    Performance Prediction Model for Cracking Gas Compressor in Ethene Unit

    • 摘要: 以乙烯装置裂解气压缩机的设计信息为基础,通过修正设计数据建立了压缩机性能模型;基于学习速率自适应误差变化思想并结合遗传算法(GA)的全局寻优特性,提出了一种改进BP算法LR-GA-BP进行压缩机性能预测;用模型对某乙烯装置四级压缩系统进行了模拟计算,压缩机第四段出口气体主要组分的预测值与实测值的相对误差均小于2%,压缩机各段出口温度和压力的预测值与实测值的相对误差均小于1%,说明裂解气压缩机性能预测模型是可靠的。根据热力学原理,将四级压缩过程等价为绝热压缩,分析了压缩机第四段出口温度较高的影响因素,提出了降温措施,并进行模拟验证。结果表明,适当增加压缩机段间返回流量可以降低压缩机第四段出口温度。本文结果对于减缓压缩系统结焦、优化压缩机操作具有重要参考价值。

       

      Abstract: Based on the design of ethylene cracking gas compressors, a new prediction model for compressor performance is established by modifying and correcting the design data according to the practical production situations. Based on the idea of learning rate varying self-adaptively with the error change and combined with genetic algorithm (GA) which contains global optimization characteristics, an improved BP algorithm (LR-GA-BP) is proposed for compressor performance prediction. The simulation calculation of a four-stage compressor system in the ethylene unit is carried out. The relative errors between the calculation values and actual values of main components in cracking gas from the fourth-stage outlet of the compressor are less than 2%, and the relative errors between the calculation values and actual values of the outlet temperature and pressure of the compressor are less than 1%, which verifies the reliability of the model. Based on the above model and thermodynamic basis, the effect factors of the higher outlet temperature at the fourth-stage of the compressor are analyzed by regarding the process of cracked gas compressing as a kind of adiabatic compression and the corresponding cooling measures are adopted. The simulation results show that increasing the return flow between compressor segments is beneficial to decrease the compressor outlet temperature and slow down coking in the compression system. The result in this paper is of some certain value for slowing down the coking of compression system and optimizing operation of compressors.

       

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