关键词: 板式换热器, 硫酸盐还原菌, 扫描电镜, 污垢热阻

Abstract: Adhesion of marine organisms，low flow rates and other factors directly affected the seawater plate heat exchanger effectiveness. This research focused on investigation of microbial fouling characteristics seawater plate heat exchanger. Sulfate reducing bacteria (SRB) were isolated by enrichment culture and attached to the seawater plate heat exchanger. Scanning electron microscopy (SEM) and thermal resistance test bench were used to analyze the formation，growth and heat transfer characteristics of adherent fouling layer under different velocities. The comparative experiments of fouling resistance in the low flow rates under ocean current environment were accomplished. The results showed that the features and characteristics of the formation of fouling were different in different periods. Spectral analysis demonstrated that the main elements were C，H，O and Ca. The microbial fouling was composed of various organic matters and suspended particles. After the induction period，the fouling resistance agreed with the gradual fouling growth model. The fouling thermal resistance increased with the increase of flow velocities under low flow rates less than 1 m/s.

Key words: plate heat exchanger, SRB, scanning electron microscopy, microbial fouling resistance