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<p>Enhancing the thermal efficiency of shell-and-tube heat exchangers is critical in the optimization of hydrocarbon processing systems. This study presents an experimental investigation into the impact of liquid hydrocarbon recirculation on heat transfer performance within a shell-and-tube apparatus. The system comprises a 1-m-long shell (diameter 76&#xa0;mm) containing seven inner tubes (diameter 15&#xa0;mm), with feed and recirculation lines of 20&#xa0;mm and 10&#xa0;mm, respectively. Experiments were conducted at a feed rate of 10 L/min and an initial temperature of 20&#xa0;°C, under varying recirculation ratios ranging from 5 to 30%. Results demonstrate that increasing the recirculation ratio leads to significant improvements in heat transfer dynamics. Specifically, a 30% recirculation rate increased the outlet temperature of oil by up to 16&#xa0;°C and gas condensate by up to 18&#xa0;°C. These changes were accompanied by a reduction in kinematic viscosity (up to 28.1% for oil and 25.4% for condensate) and a slight shift in fluid density. Enhanced hydrodynamic conditions contributed to a measurable rise in the convective heat transfer coefficient (5.49% for oil and 6.38% for condensate), with the overall heat transfer coefficient (K) increasing by up to 14%. The findings highlight the effectiveness of internal recirculation as a practical strategy for intensifying heat exchange processes in compact hydrocarbon systems, offering potential for energy savings and process efficiency improvements in industrial applications.</p>

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The influence of liquid hydrocarbon flow recirculation on the efficiency of heat exchange in a shell-and-tube apparatus

  • 期刊论文

  • 发表日期：

    2025年9月22日

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  • Oybek Ismoilov,
  • Rustam Yusupov,
  • Fozilbek Shomansurov,
  • Kumush Akhmedova,
  • Isroiljon Abdurakhmanov,
  • Mavluda Baltabayeva

摘要

Enhancing the thermal efficiency of shell-and-tube heat exchangers is critical in the optimization of hydrocarbon processing systems. This study presents an experimental investigation into the impact of liquid hydrocarbon recirculation on heat transfer performance within a shell-and-tube apparatus. The system comprises a 1-m-long shell (diameter 76 mm) containing seven inner tubes (diameter 15 mm), with feed and recirculation lines of 20 mm and 10 mm, respectively. Experiments were conducted at a feed rate of 10 L/min and an initial temperature of 20 °C, under varying recirculation ratios ranging from 5 to 30%. Results demonstrate that increasing the recirculation ratio leads to significant improvements in heat transfer dynamics. Specifically, a 30% recirculation rate increased the outlet temperature of oil by up to 16 °C and gas condensate by up to 18 °C. These changes were accompanied by a reduction in kinematic viscosity (up to 28.1% for oil and 25.4% for condensate) and a slight shift in fluid density. Enhanced hydrodynamic conditions contributed to a measurable rise in the convective heat transfer coefficient (5.49% for oil and 6.38% for condensate), with the overall heat transfer coefficient (K) increasing by up to 14%. The findings highlight the effectiveness of internal recirculation as a practical strategy for intensifying heat exchange processes in compact hydrocarbon systems, offering potential for energy savings and process efficiency improvements in industrial applications.