Atmospheric Cooling Loops

Atmospheric cooling loops were used in earlier designs to cool gasses. They had bypass ducts also to prevent excessive cooling. They were easy to fabricate, and there was no coohng blower used. Heat recovery was not done and more space was occupied. These are mostly replaced by air pre-heaters or economisers wherever possible. 

---

Limit maximum utility temperature by choosing different heating/cooling medium (e.g.. tempered water in atmospheric loop vs. high pressure steam)... 

Step 3. Eventually we will connect the solvent recycle loop from column 2 to column 1. But first include a heat exchanger to cool the solvent. If you don t do this column 1 will not work after you connect the solvent recycle loop (why not ). (To put the heat exchanger in the solvent line, go to Heat Exchangers and put a HEATER—used as a cooler in this case—in your flowsheet. Then left click on the solvent stream and right click on Reconnect Destination. Then connect the solvent stream to the arrow on the heat exchanger. Hit the Next button. You will get a window for the heat exchanger. Use 80°C. Pressure is 1.0 atmosphere.) For Valid Phases use liquid only. To check that the HEATER is hooked up properly, try a run without changing the solvent makeup flow rate. 

Cooling of the plant pool is guaranteed, for an unlimited time, by virtue of two loops provided with coolers in natural circulation, sized to reject, approximately 2 MW to the external atmosphere and thereby capable of keeping the pool water temperature below 80 C. 

---