空壓機與冷卻水塔系統節能操作技術建立

中鋼廠內壓縮空氣用量約200,000 Nm^3/hr，年耗電約2.5*10^8kWh，佔公司用電量5%，改善空壓系統效率為節能研究的重要方向。廠內常見的壓縮機組均為離心式多級壓縮模式，由理論分析顯示，降低級間冷卻器壓縮空氣溫度可減少壓縮機能耗，但此必需付出增加冷卻水塔能耗的代價，由此必須考量整體系統的能耗影響關係，尋找一個平衡點才能真到達到節能的目標。本研究首先利用模擬軟體建立空壓機能耗與冷卻水溫關係，再建立冷卻水塔能耗與冷卻水溫關係，然後結合兩者能耗模型及冷卻水溫變化範圍，解析出系統最低能耗之冷卻水溫設定。經由模擬結果顯示，降低冷卻水溫度5℃，並考量冷卻水塔所需額外付出的能耗，空壓機與冷卻水塔整體系統能耗可降低1.28%。實際現場驗證結果顯示，操作於建議設定點能降低整體系統能耗，空壓機與冷卻水塔系統能改進1%能耗，年節電量大於1,300,000 kWh。

關鍵字

空壓系統；冷卻水塔；系統節能

並列摘要

The compressed air consumption in CSC is about 200,000 Nm^3/hr, and the annual power consumption is about 2.5*10^8 kWh, accounting for 5% of the total company's electricity consumption. Improving the efficiency of air compressor systems is an important issue for energy conservation. Multistage compression process, centrifugal air compressor is the most common type in CSC. Theoretical analysis shows that decreasing outlet air temperature of inter-cooler can reduce compressor energy consumption. However, the cost is to increase the energy consumption of the cooling tower. Therefore, the overall system (air compressor and cooling tower) energy consumption must be considered. First, the relationship between energy consumption of air compressor and the cooling water temperature of intercooler is confirmed by the simulation software. Then, the previous research results show that the relationship between energy consumption of cooling tower and outlet cooling water temperature. The cooling water temperature setting can be calculated from cooling tower and air compressor energy models. Simulation results show that reducing the cooling water temperature by 5 °C, the overall system energy consumption can be reduced by 1.28%. The plant test in CSC #2 and #3 compressed air station shows that reducing the cooling water temperature, the system energy consumption is reduced by about 1%. The plant test shows that annual electricity saving is about 1,300,000 kWh.

並列關鍵字

compressed air system ； cooling tower ； system energy conservation

國際替代計量

空壓機與冷卻水塔系統節能操作技術建立

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