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横向风是造成直接空冷凝汽器迎风侧空冷单元风机进气量降低甚至空气倒灌的主要原因,解决横向风对直接空冷凝汽器的不良影响具有重要意义。该文提出了一种改善横向风对直接空冷凝汽器不良影响的新方法,即在空冷凝汽器的迎风侧挡风墙下方加装导流网。以某1000MW直接空冷凝汽器的一组典型单元为研究对象,建立几何模型和数学模型,通过计算流体力学(computational fluid dynamics,CFD)模拟分析,阐明了加装导流网以提高风机入口进气流量的机制。研究表明:加装导流网可以有效地减弱空冷凝汽器横向风迎风侧上游单元风机入口的负压,增大进气量,同时避免了加装导流板对下游风机的不利影响。
Transverse wind is the main reason that causes the air intake of the air-cooled unit fan on the windward side of the direct air-cooled condenser to be reduced or inflated. Therefore, solving the adverse effect of the transverse wind on the direct air-cooled condenser is of great significance. In this paper, a new method to improve the adverse effect of transverse wind on the direct air-cooled condenser is proposed, that is to say, a draft net is installed below the windward wind-shielding wall of the air-cooled condenser. Taking a typical unit of a 1000MW direct air-cooled condenser as the research object, the geometric model and the mathematical model are established, and the computational fluid dynamics (CFD) simulation analysis is carried out to illustrate the feasibility of installing a diversion net to improve the fan inlet Air flow mechanism. The research shows that the installation of diversion net can effectively reduce the negative pressure of the inlet of the upstream unit fan on the windward side of the horizontal condenser of the air-cooled condenser and increase the intake air volume, meanwhile, it avoids the unfavorable influence of the additional deflector on the downstream fan.