CAJ | 학술논문

运用特种塑料材料的换热器可以解决烟气余热回收中的低温腐蚀问题，扩大热回收的温度范围。结合1000 MW机组烟气余热回收工况，分析了氟塑料管束式换热器和导热塑料翅片管换热器的性能，比较了两者在传热系数、换热面积、换热器体积、流动阻力等方面的差异。尽管氟塑料换热器在传热系数和材料消耗方面具有优势，但翅片管换热器整体体积更小，且管件数量远小于氟塑料换热器。在此基础分析了污垢热阻和材料热导率对翅片管换热器的影响，发现污垢热阻会造成换热器性能20%~30%的变化，材料热导率则需要达到15~20 W/(m?K)的阈值，才能实现较好的换热性能。
운용특충소료재료적환열기가이해결연기여열회수중적저온부식문제，확대열회수적온도범위。결합1000 MW궤조연기여열회수공황，분석료불소료관속식환열기화도열소료시편관환열기적성능，비교료량자재전열계수、환열면적、환열기체적、류동조력등방면적차이。진관불소료환열기재전열계수화재료소모방면구유우세，단시편관환열기정체체적경소，차관건수량원소우불소료환열기。재차기출분석료오구열조화재료열도솔대시편관환열기적영향，발현오구열조회조성환열기성능20%~30%적변화，재료열도솔칙수요체도15~20 W/(m?K)적역치，재능실현교호적환열성능。
Heat exchangers made of special plastics can solve the problem of low temperature corrosion in flue gas heat recovery, so that the lower limit of temperature restriction can be eliminated. In this paper, polytetrafluoroethylene (PTFE) tube bundle heat exchanger and fin-tube heat exchanger made of thermally conductive plastic were evaluated under the same work condition of a 1000MW power plant. Parameters including heat transfer coefficient, heat transfer area, heat exchanger volume, pressure drops were compared between the two types of heat exchangers. Although the PTFE tube bundle heat exchanger has higher heat transfer coefficient and consumes relatively less raw material for manufacturing, the fin-tube heat exchanger has smaller volume and much less number of tubes. Based on the comparison, further studies on fouling thermal resistance and material thermal conductivity were carried out for fin-tube heat exchanger. The results show fouling thermal resistance can lead to 20%~30% of performance variation. And the material thermal conductivity need to reach a threshold value of 15~20W/(m?K) to achieve satisfactory heat transfer performance.