Changing from water-cooled heat exchanger to air-cooled heat exchanger
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Could everyone help discuss this? The existing heat exchanger uses circulating water as the cooling medium for the process gas. I would like to use carbon dioxide or nitrogen as the cooling agent, without changing the existing heat exchanger or the process pipelines. (The heat exchange area of the existing heat exchanger is 2400 square meters; the inlet temperature of the process gas is 100 degrees, and the outlet temperature is 40 degrees. The circulating water pipeline has a diameter of DN600, with an inlet water temperature of 25 degrees and an outlet temperature of 30 degrees, under a water pressure of 0.3 MPa.) What volume flow rate of carbon dioxide or nitrogen is required? What should be the initial temperature, and what pressure and outlet temperature should be used?
The heat exchange efficiency is much worse with gas-based cooling. Do the casing and heat exchange tubes meet the minimum temperature requirements for use? It’s best to simulate it using software
Your heat exchange rate is way too high. . . I’m not sure what the flow rate is; if it’s 3 m/s for a DN600 pipe, the total heat transfer capacity is likely to be over 20 MW. Given that the gas heat transfer coefficient is low, the heat exchange area needs to be well over 10,000 square meters