Abstract
With the increasing demand of oil products in China, the energy consumption of pipeline operation will continue to rise greatly, as well as the cost of oil transportation. In the field of practical engineering, saving energy, reducing energy consumption and adapting to the international oil situation are the development trends and represent difficult problems. Based on the basic principle of non-equilibrium thermodynamics, this paper derives the field equilibrium equations of non-equilibrium thermodynamic process for pipeline transportation. To seek the bilinear form of “force” and “flow” in the non-equilibrium thermodynamics of entropy generation rate, the oil pipeline exergy balance equation and the exergy transfer pipeline dynamic equation of the irreversibility were established. The exergy balance equation was applied to energy balance evaluation system, which makes the system more perfect. The exergy flow transfer law of the waxy oil pipeline were explored deeply from the directions of dynamic exergy, pressure exergy, thermal exergy and diffusion exergy. Taking an oil pipeline as an example, the influence factors of exergy transfer coefficient and exergy flow density were analyzed separately.
Highlights
The common energy analysis in practical engineering problems is carried out at the “quantity”level
Since there is no external force on work exergy rate, the exergy transfer equation can be expressed by the sum of Equations (38), (40), (42) and (44) [25]: ρ j ex
As the decisive factors for the wax crude oil exergy transfer capacity are the exergy transfer coefficient and the exergy flow density, further analysis of the influence factors is beneficial to the subsequent research in reducing energy consumption in the pipeline process
Summary
The common energy analysis in practical engineering problems is carried out at the “quantity”. In the process of energy saving, it is important to consider the role of exergy fully and effectively This is the embodiment of energy quality, which can reduce unnecessary exergy loss. In 1992, Dunber W.R. decomposed the energy equation and exergy equation, and the relationships between transfer and conversion of energy and exergy in different forms were analyzed concretely [5]. In 1993, an energy transfer process was proposed by Xiang Xinyao: the combination of exergy thermodynamic properties and energy transfer law. It can clarify the different forms of exergy transfer and conversion rules. Studies on the influence factors of the different exergy transfer processes are an important theoretical step in energy saving factors of the pipeline process
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