高炉冲渣水有机朗肯循环波纹板式冷凝器传热特性

Heat Transfer Characteristics of Corrugated Plate Condenser in Organic Rankine Cycle for Blast Furnace Slag Flushing Water

摘要:

针对90 ℃左右的高炉冲渣水有机朗肯循环（ORC）发电系统，建立了R245fa在波纹板式冷凝器中的冷凝传热数值模型，并验证了模型的正确性。借助冷凝传热数值模型，探讨了蒸汽过热度、壁面过冷度、蒸汽干度对传热系数、压降和综合传热性能的影响，拟合了适用于以R245fa为工质的ORC发电系统中波纹板式冷凝器的传热关联式。针对冷凝器冷凝液相体积分数沿板长方向的变化情况，探讨了冷凝器中间排液的可能性，并就液相体积分数给出了合适的中间排液范围。

Abstract:

Heat transfer numerical model of a corrugated plate condenser was established. The plate condenser was used in organic Rankine cycle （ORC） power generation system and R245fa was chosen as working medium for 90 ℃ flushing water of blast furnace slag. Then the experimental platform was built to verify the correctness of the numerical model. With the help of the numerical model， the effects of the overheat degree， wall supercooling and vapour dryness on heat transfer coefficient， pressure drop and comprehensive heat transfer performance were discussed. And the heat transfer correlation formula for the plate condenser with R245fa as working medium was fitted. According to the volume fraction of condensate phase along the plate length， the possibility of intermediate drain of the condenser was discussed， and the suitable intermediate drain range along the plate length was given for the volume fraction of condensate phase.