CAJ | 학술논문

目前普遍使用的螺旋折流板换热器壳程的一个螺距主要采用4块平面折流板结构，但在相邻两块折流板的直边搭接处存在顶角相对的两个三角漏流区，使壳程流体偏离理想的螺旋流，严重影响了换热器的性能。采用折面折流板结构，可以封闭原始折流板之间的外侧三角漏流区，使壳程流体更接近连续的螺旋流动。实验结果表明，采用折面折流板代替原始的平面折流板后，换热器总传热系数增加6.7%～19.1%，平均增大16.9%，表明此折面折流板能有效提高螺旋折流板换热器的换热性能。虽然壳程压降也随之增大，但带来的泵耗功率增量非常有限。换热器的热性能因子均大于1.0，平均值为1.071，表明结构改进后的换热器，其综合性能平均提高7.1%。基于实验数据，拟合了结构改进前后的换热器壳程传热系数和阻力系数的相关实验关联式。研究结果对于换热器的节能优化具有重要的指导意义。
목전보편사용적라선절류판환열기각정적일개라거주요채용4괴평면절류판결구，단재상린량괴절류판적직변탑접처존재정각상대적량개삼각루류구，사각정류체편리이상적라선류，엄중영향료환열기적성능。채용절면절류판결구，가이봉폐원시절류판지간적외측삼각루류구，사각정류체경접근련속적라선류동。실험결과표명，채용절면절류판대체원시적평면절류판후，환열기총전열계수증가6.7%～19.1%，평균증대16.9%，표명차절면절류판능유효제고라선절류판환열기적환열성능。수연각정압강야수지증대，단대래적빙모공솔증량비상유한。환열기적열성능인자균대우1.0，평균치위1.071，표명결구개진후적환열기，기종합성능평균제고7.1%。기우실험수거，의합료결구개진전후적환열기각정전열계수화조력계수적상관실험관련식。연구결과대우환열기적절능우화구유중요적지도의의。
Four fan-shaped baffles are used to form a pitch in shell side of heat exchangers with helical baffles. There are two triangular leakage zones between the two adjacent baffles, making the shell-side fluid deviate from ideal plug flow and degrading the heat transfer performance of the heat exchanger. In this paper, the structure of fold baffle is used to block the external triangular leakage zones, so the shell-side fluid flows in approximately continuous spiral flow. The heat transfer experiments are used to evaluate the performance of the improved heat exchanger. The experimental results show that the shell-side heat transfer coefficient is increased by 11.6%-21.6% and the overall heat transfer coefficient is increased by 6.7%-19.1% with an average value of 16.9%, compared with that of conventional heat exchanger with plain baffles. The heat transfer of improved heat exchanger is intensified obviously. Although the shell-side pressure drop increases correspondingly, the increment in pumping power consumption is limited. The values of thermal performance factor are all above 1.0, with an average value of 1.071. It demonstrates that taking into account heat transfer coefficient and pressure drop, better integrative performance is obtained through the configuration optimization of baffles. It is benefit to optimizing design for heat exchangers with helical baffles.