长呼原油管道优化运行分析

Optimal operation of Changqing-Hohehot Crude Oil Pipeline

长呼原油管道为保温管道,在投产运行的首个冬季,没有成熟的运行经验可供参考。为此,梳理了运行影响因素,进而通过对沿线油温、地温及物性进行跟踪统计分析,逐步调整优化运行方案,在确保安全运行的前提下,实现了节能降耗。通过优化运行方案,由全线各站全部启炉(运行6台加热炉)调整为仅需3站启炉(运行4台加热炉),全线温降相比设计和投产初期温降数值大幅降低,降凝剂用量节约25%,实际运行平均总传热系数低于设计值。由此可知,保温原油管道结蜡现象不明显,生产单耗小,节能优势明显。

For the insulated Changqing-Hohehot Crude Oil Pipeline which will face the first winter after commissioning, no mature optimal operation experience is available for reference. Therefore, the factors affecting optimal operation are investigated, and then the oil temperature, ground temperature and physical properties along the pipeline are traced and analyzed. In this way, the operation scheme is optimized gradually to achieve safe transportation in an energy-saving and cost-reducing manner. Through optimization, the start-up operation is changed from all pump stations to only 3 pump stations, and 6 operating heaters originally are reduced to 4 heaters. Accordingly, the temperature drop along the pipeline is reduced substantially from the level in primary design and at the initial stage of commissioning, dosage of antifreezing agent is saved by 25%, and average total heat transfer coefficient in actual operation is lower than the value set in primary design. Therefore, it is recognized that wax precipitation along the pipeline is not obvious, unit energy consumption is low, and much energy is saved.