Abstract: Before the retrofit of the condenser of large thermal power plant,there is a phenomenon of poor heat transfer characteristics, which seriously affects the economic performance of the unit, In this paper,the structure of the condenser is modified with a bionic double connecting pipe,and the performance evaluation test is carried out after the retrofit. The result shows that the retrofit plan is feasible,and the design of the condenser vacuum can reach the design value under the condition that the circulating water temperature,flow rate and condenser heat load are the same

Key words: condenser, tube bundle collocation, performance analysis, flow and heat transfer characteristics