Experimental research on active cooling technique of exhaust gas from COIL

Improving the ejector efficiency is a key technique in the research of ejector-type pressure recovery system (PRS) of COIL, and the goal could be achieved using active cooling technique which would reduce the exhaust gas temperature. Based on the design parameters gained by theoretic and numerical calculations, a cooling equipment with finned tube heat exchanger is manufactured, which uses liquid nitrogen as refrigerant. Final experimental results show that the exhaust gas temperature could be reduce from 590 K to 160 K in the experiment lasting for 60 s, and the temperature un-uniformity could be controlled within 21 K at the exit section of the heat exchanger, and the total pressure loss of the heat exchanger is less than 100 Pa.