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本文根据热经济学原理,确定了空冷机组的电站初始温差、空冷器水速和迎面风速优化计算的目标函数——年度化计算费yy=CO_f+CO_6+(β_T+γ_T)CI_T+(β_H+γ_H)CI_H并依据空冷器传热原理、冷却塔空气动力理论以及多元回归统计方法导出目标函数的解析表达式.然后,以表面式冷凝器的间接空冷系统为对象,结合国产N200-130/535/535型汽轮机对空冷系统尾部参数ITD、V_w 和V_(NF)进行优化计算.并对四种不同型号的冷却元件进行比较,获得了最佳尾部参数.优化计算结果表明:气温t_a 对ITD_(OPT)、V_(w.OPT)、V_(NF.OPT)的数值在相当广阔的范围内影响不大,气温自6.5℃至30℃范围内,可采用ITD_(OPT)=28℃,V_(w.OPT)=0.8m/s,V_(NF.OPT)=2.28m/s.空冷元件不同,最佳尾部参数略有改变,而以P6×3-2010/87-16型冷却元件效果最好.文中提供的尾部参数优化目标函数以及优化计算的数值方法,原则上也适用于其他空冷系统.所取得的优化结果对海勒系统有直接参考价值.
According to the principle of thermoeconomics, the objective function of the initial temperature difference of the air-conditioning unit, the water speed of the air cooler and the on-the-face wind speed optimization calculation is calculated. The annualized calculation fee yy = CO_f + CO_6 + β_T + γ_T CI_T + β_H + γ_H, CI_H and derive the analytic expression of the objective function according to the heat transfer principle of the air cooler, the aerodynamic theory of the cooling tower and the multiple regression statistical method.Then, taking the indirect air cooling system of the surface condenser as the object, combined with the domestic N200-130 / 535/535 Type steam turbine is used to optimize the tail parameters ITD, V_w and V_ (NF) of the air cooling system, and the best tail parameters are obtained by comparing four different types of cooling elements.Optimization results show that the air temperature t_a affects ITD_ (OPT) , V_ (w.OPT) and V_ (NF.OPT) have little influence on a wide range of temperatures. ITD_ (OPT) = 28 ℃ and V_ (w) can be used in the temperature range from 6.5 ℃ to 30 ℃. OPT) = 0.8m / s, V_ (NF.OPT) = 2.28m / s.After the air-cooled components are different, the optimum tail parameters are slightly changed, while the P6 × 3-2010 / 87-16 type cooling components are the best. The tail parameter optimization objective function provided in this paper and the numerical method for optimizing calculation are also applicable to other air-cooled System optimization results achieved direct reference to Heller.