一种简化型超临界CO2动力循环换热系统的优化设计

Design Optimization on the Heat Transfer System of a Simplified Supercritical CO2 Power Cycle

对一种以高效发电和CO2捕集为目标的简化型超临界CO2动力循环的换热系统的初步设计进行了优化,以100 MW发电功率机组回热系统的透平排气与CO2气体之间的HX1-1换热器为例,讨论了壳体内径、管外径与倾斜角对传热系数和壳程压降等性能指标的影响。给出了透平背压与循环效率的关系,优化换热系统的结构,以提高循环效率和经济性。

Optimization was conducted on the preliminary design of a heat exchanger system with simplified supercritical CO2 power cycle targeting high-efficiency power generation and CO2 capture.Taking the HX1-1 heat exchanger between the turbine exhaust gas and the circulating CO2 gas in the heat recovery system of a 100 MW power unit as an example,the effects of the shell inner diameter,tube outer diameter and inclination angle on the heat transfer coefficient and shell-side pressure drop were discussed.Moreover,the relationship between the turbine back pressure and cycle efficiency was given,which may serve as a reference for structural optimization of the heat exchanger system to improve the cycle efficiency and economy.