Effects of windbreak mesh on thermo-flow characteristics of air-cooled steam condenser under windy conditions

Abstract Ambient wind has adverse impacts on the thermal-flow characteristics of air-cooled steam condenser (ACSC). A windbreak mesh is arranged below the ACSC platform and outside the ACSC steel supporting structure to improve ACSC performance, and its effects are numerically investigated. The windbreak mesh in a rectangle-type configuration improves the volumetric effectiveness of almost all periphery fans because of the protection effect. It also increases the volumetric effectiveness of most inner fans at +X wind direction, while it has little effect on inner fans at +Y wind direction because main buildings locating upstream of the ACSC weaken the protection effect of windbreak mesh. In addition, the windbreak mesh has the greatest effect on inlet air temperatures of windward fans at +X wind direction because of the alleviation of reversed flow, while the inlet air temperatures of periphery fans locating in Row 1 and Row 8 decrease obviously at +Y wind direction as a result of hot air recirculation mitigated by windbreak mesh. Obviously, the total ACSC heat transfer effectiveness is improved by windbreak mesh under windy conditions. Compared with grid-type and cross-type configurations, the windbreak mesh in rectangle-type configuration can protect the periphery fans to avoid suffering ambient wind to the greatest extent, and it consequently shows the best performance in general.

[1]  Yongping Yang,et al.  IMPROVEMENT OF THERMAL PERFORMANCE FOR AIR-COOLED CONDENSERS BY USING FLOW GUIDING DEVICE , 2012 .

[2]  Detlev G. Kröger,et al.  The effect of screens on air-cooled steam condenser performance under windy conditions , 2010 .

[3]  Maoqing Li,et al.  Performance prediction of an air-cooled steam condenser using UDF method , 2013 .

[4]  Weeratunge Malalasekera,et al.  An introduction to computational fluid dynamics - the finite volume method , 2007 .

[5]  Xiaoze Du,et al.  Influences of wind-break wall configurations upon flow and heat transfer characteristics of air-cooled condensers in a power plant , 2011 .

[6]  He Weifeng,et al.  Mechanism of the air temperature rise at the forced draught fan inlets in an air-cooled steam condenser , 2014 .

[7]  He Weifeng,et al.  Influence from the rotating speed of the windward axial fans on the performance of an air-cooled power plant , 2014 .

[8]  Qiuwang Wang,et al.  CFD simulation on a thermal power plant with air‐cooled heat exchanger system in north China , 2008 .

[9]  Yan Li,et al.  Wind tunnel simulation of exhaust recirculation in an air-cooling system at a large power plant , 2007 .

[10]  Peiqing Liu,et al.  Numerical investigation of hot air recirculation of air-cooled condensers at a large power plant , 2009 .

[11]  Xiaoze Du,et al.  Wind effect on the thermo-flow performances and its decay characteristics for air-cooled condensers in a power plant , 2012 .

[12]  Detlev G. Kröger,et al.  An Investigation of Air-Cooled Steam Condenser Performance Under Windy Conditions Using Computational Fluid Dynamics , 2011 .

[13]  Detlev G. Kröger,et al.  Numerical investigation of fan performance in a forced draft air-cooled steam condenser , 2006 .

[14]  Detlev G. Kröger,et al.  Contributors to increased fan inlet temperature at an air-cooled steam condenser , 2013 .

[15]  Detlev G. Kröger,et al.  The influence of wind on the performance of forced draught air-cooled heat exchangers , 1996 .

[16]  Bo Yu,et al.  Performance prediction of an improved air-cooled steam condenser with deflector under strong wind , 2010 .