Stabilizer bottom product cooler

The stabilizer bottom product cooler is used to cool the bottom product leaving the tower before it goes to a tank or pipeline. Normally, the bottom product will be cooled from the operating temperature of 150-200 °C (300-400 F) to 40-50 °C (100-120 °F). The temperature of the bottom product may be dictated by sales contract or by efforts to prevent loss of vapors from an atmospheric storage tank. 

The bottom product from the stabilizer is flashed to storage. The stabilizer should include a product cooler to cool the bottom product and prevent flashing of the liquid as it is lowered to storage pressure. Depending on operating pressure, the bottom temperature will range from 90 to 200 °C (200-400 °F). 

The cooler may be an air-cooled exchanger or a shell-and-tube exchanger, which is quite often used when there is another system that needs to be heated. For a stabilizer with a reflux system, the bottom product may be cooled by exchanging heat with the feed to the stabilizer. The presentation on heat exchangers, covered in Volume 2 of the "Surface Production Operations" series, provides procedures for the selection and sizing of shell-and-tube heat exchangers. 

Step 2. There are 23 control degrees of freedom. They include two fresh feed valves for hydrogen and toluene purge valve separator base and overhead valves cooler cooling water valve liquid quench valve furnace fuel valve stabilizer column steam., bottoms, reflux, cooling water, and vapor product valves product column steam, bottoms, reflux, distillate, and cooling water valves and recycle column steam, bottoms, reflux, distillate, and cooling water valves. 

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