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采用机力冷却塔与板式换热器模拟电厂循环冷却系统,分别用海水和脱硬浓盐水作为循环冷却水,考察了2种水对机力冷却塔和钛板式换热器性能的影响。结果表明,循环水量每增加1%,海水出塔水温升高0.04℃,蒸发损失量增加了0.006 m3/h,脱硬浓盐水出塔水温升高0.035℃,蒸发损失量增加了0.009 m3/h。水温每增加1℃,海水出塔水温升高0.13℃,蒸发损失量增加0.025 m3/h;脱硬浓盐水出塔水温升高0.1℃,蒸发损失水量增加0.027 m3/h。脱硬浓盐水传热系数随浓升高而缓慢增大,海水则随浓度升高而下降;同一浓度下,脱硬浓盐水作为循环水时,板式换热器换热效率随运行时间基本不变,海水则随运行时间延长而下降。
The mechanical cooling tower and plate heat exchanger were used to simulate the power plant circulating cooling system. Seawater and hard brine were used as the circulating cooling water respectively. The effects of two kinds of water on the performance of cooling towers and titanium plate heat exchangers were investigated. The results showed that for every 1% increase of circulating water, the temperature of rising seawater increased by 0.04 ℃, the evaporation loss increased by 0.006 m3 / h, the temperature of de-hardening brine increased by 0.035 ℃ and the evaporation loss increased by 0.009 m3 / h. For every 1 ℃ increase in water temperature, the water temperature in the seawater tower increased by 0.13 ℃ and the evaporation loss increased by 0.025 m3 / h. The temperature of the de-brine brine increased by 0.1 ℃ and the evaporation loss increased by 0.027 m3 / h. The heat transfer coefficient of hard brine decreases slowly with the increase of the concentration, while the sea water decreases with the increase of the concentration. Under the same concentration, the heat exchange efficiency of the plate heat exchanger decreases with the running time Change, sea water is running down with the extension of time.