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Environmental sustainability enhancement of a petroleum refinery through heat exchanger network retrofitting and renewable energy

机译:通过换热网络改造和可再生能源提高炼油厂的环境可持续性

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This paper presents a case study on the enhancement of environmental sustainability in a petroleum refining process based on an exergetic diagnostic approach. The Life Cycle Assessment (LCA) pinpointed crude oil production and electricity generating systems as the main sources of environmental unsustainability. The existing hot utility demand of the process is 78.4 MW with a temperature difference of 40°C, where the area efficiency of the existing design is 0.7254. The targeting stage sets the minimum approach temperature at 18.96 °C, thereby establishing the scope for potential energy savings. The suggested design option with a total energy demand of 109,048 kW, the same as the existing one but 72,699 kW higher than the target, needs a 17,873 m2 area in 38 exchangers. Notably, this requires 2,914 m2 less surface area, suggesting the practicality of the project with a limited number of modifications such as the repiping of the existing exchanger units. Moreover, to enhance further the sustainability of the petroleum refining process, the possible solutions such as the renewables were evaluated through various scenarios; thus, resulting in a reduction in the environmental impacts from 2.34E-06 to 2.27E-06 according to ReCiPe, and thus paving the way towards a sustainable petroleum refining process.
机译:本文提出了基于能动诊断方法提高石油精炼过程环境可持续性的案例研究。生命周期评估(LCA)将原油生产和发电系统确定为环境不可持续性的主要来源。该工艺的现有热电厂需求为78.4 MW,温差为40°C,现有设计的面积效率为0.7254。目标阶段将最低进近温度设置为18.96°C,从而为潜在的节能奠定了基础。建议的设计方案的总能量需求为109,048 kW,与现有的相同,但比目标高72,699 kW,在38个交换器中需要占地17,873 m2。值得注意的是,这需要少2,914平方米的表面积,这表明该项目的实用性,并进行了有限的修改,例如对现有交换器单元进行重新安装。此外,为了进一步提高石油精炼过程的可持续性,通过各种方案评估了可能的解决方案,例如可再生能源;因此,据ReCiPe称,其对环境的影响从2.34E-06减少到2.27E-06,从而为实现可持续的石油精炼工艺铺平了道路。

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