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基于夹点技术的汽油加氢装置换热网络节能研究
Research on Energy Saving of Heat Exchange Network of Gasoline Hydrogenation Unit Based on Pinch Point Technology
常鑫
作者单位:盘锦浩业化工有限公司
中文关键字:夹点 汽油加氢 换热网络 节能优化
英文关键字:pinch point, gasoline hydrogenation, heat exchange network, energy saving optimization
中文摘要:针对某石化企业70 wt/a汽油加氢装置,采用夹点技术对汽油加氢装置的换热网络进行分析与节能优化,实现装置内高品质热源的梯级利用,消除了违背夹点规则的不合理传热现象。以最小传热温差18 ℃确定换热网络能量目标,该装置现最小传热温差为50 ℃,现热公用工程能耗3.48×107 kJ/h,现冷公用工程能耗5.24×107 kJ/h;优化后所需最小热公用工程能耗2.52×107 kJ/h,所需最小冷公用工程能耗4.3×107 kJ/h;具有热公用工程节能潜力为27.6%,冷公用工程节能潜力为17.9%。在装置原有的换热网络基础上提出改造方案,通过新增2台换热器调整换热顺序,可节约热公用工程27.3%,冷公用工程17.6%。研究表明,优化后的换热网络取得了显著的经济效益,该优化方案的总投资为94.6万元,经济效益为594.3万元/年,投资回收期为1.9个月
英文摘要:For a petrochemical enterprise’s 70 wt/a gasoline hydrogenation unit, the heat exchange network of the gasoline hydrogenation unit was analyzed and energy-saving optimized using pinch point technology to realize the cascade utilization of high-quality heat sources in the unit and eliminate the violation of the pinch point rule The phenomenon of unreasonable heat transfer. The minimum heat transfer temperature difference of 18 ℃ is used to determine the energy target of the heat exchange network. The current minimum heat transfer temperature difference of the device is 50 ℃, the energy consumption of existing heating utilities is 3.48×107 kJ/h, and the energy consumption of existing cooling utilities is 5.24×107 kJ/h ; After optimization, the required minimum energy consumption of hot public works is 2.52×107 kJ/h, and the required minimum energy consumption of cold public works is 4.3×107 kJ/h; the energy saving potential of hot public works is 27.6%, and the energy saving potential of cold public works is 17.9 %. Based on the original heat exchange network of the device, a transformation plan is proposed, and the heat exchange sequence can be adjusted by adding two heat exchangers, which can save 27.3% of heat public works and 17.6% of cold public works. Research shows that the optimized heat exchange network has achieved significant economic benefits. The total investment of the optimized solution is 946,000 yuan, the economic benefit is 5.943 million yuan per year, and the investment payback period is 1.9 months.
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