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This post was last edited by sea Na All rivers on 2010-9-21 at 14:07. Hello everyone! The designed full-load steam pressure for this fully condensing unit is 10. MpaG, with a steam consumption of 160 T/H; the exhaust steam pressure is 15 Kpa gauge. The original design of the air-cooling island had a relatively small heat exchange area; in summer, when the ambient temperature reached 30 degrees Celsius, the exhaust pressure of the unit was 50 KPa, forcing all fans to operate at 110% capacity. The entire air separation unit can only operate at 60% capacity. We also carried out modifications by adding spray desalinated water to the fins of the air-cooled island heat exchangers, but the results were not satisfactory! Moreover, an excessive amount of water that cannot be recovered also affects thermoelectricity. The proposed renovation plan is as follows: 1. Add another fan, but the cost is too high. 2. Make an opening in the upper part of the main exhaust pipe to allow exhaust gas to flow out, thereby improving the cooling effect of the water cooler and achieving better results. I would also like everyone’s help in discussing the following: 1. The feasibility of the second alternative. The amount of circulating water is limited. So I want to use the return water from the circulating water system as a cooling source! Question: Can water be returned without a pressure difference? 2. What flow rate is required to supply water directly using a circulating system (concerned that it may affect the operation of the unit)? It is planned to increase cooling by the heat exchanger by 25% for a unit load of 40 tons of steam. The circulating water pressure is 4 kilograms and the water temperature is 28 degrees. Please estimate how much circulating water is needed for cooling, as well as what the heat exchange area of the heat exchanger should be!