Research On The New Types Of Air-cooled Condenser Cell And Their Heat Transfer Characteristics

Direct air cooling technology has been applied more and more widely in some of today's inland areas, which are lack of water and rich in coal. The benefits it brings are significant, but the defects of heat transfer of its air-cooled condenser cell are also obvious. The "?" shaped structure of direct air-cooled cell is widely praised by people,but it is also the main reason of the uneven distribution of internal flow field and temperature field in the direct air-cooled cell. In order to solve these problems and make the air-cooled unit running more economically and safely, predecessors have tried their best to repair the defects of the "?" shaped air-cooled cell. This paper is also committed to innovate and break through the limitation; it proposes two new types of air-cooled cell, and their heat transfer characteristics are researched, which is of significance for improving traditional direct air cooling technology.The aim of this paper is to improve the current typical direct air-cooled condenser cell. First of all, taking the 600 MW unit model of Long-shan power plant as the comparative object, we make simulations of the flow and heat field of the two new types of air-cooled cell, which were firstly provided by us. Then the baffle and the half fin baffle were respectively installed in the top of the hyperbolic air-cooled cells, the influence of the porosity on heat transfer of the hyperbolic air-cooled cell is simulated and analyzed, and the optimized type of the hyperbolic air-cooled cell is got.Secondly, based on the consideration of the installation and the heat transfer area of hyperbolic air-cooled cell, innovation was made to change the hyperbolic heat transfer surface into frustum cone-like surface. The relationship between the flow and heat transfer characteristics and the top baffle porosity of the frustum cone-like air-cooled cell is studied, and the optimal baffle porosity for heat transfer and safety is got.Thirdly, the effect of the shapes of wind screen on the heat transfer characteristics of the frustum cone-like air-cooled cell is studied, and the shapes of wind screen are optimized. Finally, the comparisons for these direct air-cooled cells in different inlet wind speeds and ambient temperatures are made, and we obtained the optimized direct air-cooled cell for heat transfer and safety. All these we have done are going to provide some significant theory evidence for improving of direct air cooling technology.