天然气浅冷装置冷量回收优化工艺

以大庆油田有限责任公司天然气分公司浅冷装置为例,分析浅冷装置轻烃和外输干气冷量回收现状,提出存在的问题及改进措施。在通过HYSIM软件进行模拟计算的基础上,对各种改造方案进行分析和比较,最终提出采用多股流换热器的冷量回收工艺。在浅冷装置上采用该优化工艺时,按轻烃和外输干气回收温度达到10℃计,回收热量263.6MJ/h,富天然气温度由5℃降到-1.94℃,氨蒸发器的负荷降低20.4%,年节电6.061×105kWh,年节约生产成本47.7万元。

PROCESS OPTIMIZATION FOR RECOVERING COLD ENERGY OF NATURAL GAS SHALLOW CONDENSING UNIT

Taking the shallow condensing unit of Daqing Oilfield Natural Gas Company as an example, the current cold energy recovery situation of light hydrocarbon and export dry gas of shallow condensing unit was analyzed. Some existed problems and measures of improvement were put forward. Various schemes for improvement were compared based on the simulation computations by HYSIM software. Finally, a cold energy recovery process using multi-flow heat exchanger was proposed. After adopting said optimized process, when the recovery temperature of light hydrocarbon and export dry gas was 10℃, 263.6 MJ/h of cold energy could be recovered, the temperature of rich natural gas was decreased to -1.94℃ from 5℃, the load of ammonia evaporator reduced by 20.4％, the annual saving of electricity and production cost reached 60.61×104 kWh and 0.477 MRMB, respectively.