B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
23/348
B01J 8/00 (2006.01) B01D 53/50 (2006.01) B01D 53/86 (2006.01) C01F 11/46 (2006.01)
Patent
CA 1247327
CONTINUOUS CONTROLLED PROCESS FOR REMOVING SULPHUR OXIDES GASES FROM STACK GASES ABSTRACT OF THE DISCLOSURE A process for effecting the continuous desul- phurization of stack gases includes a double loop computerized system (10) for continuously effecting the desulphurization. The stack gases are passed through heat exchangers (14, 15) to raise the temperature to approximately 700°F, the first heat exchanger (14) receiving hot desulphurized exit gas from a reactor (27) and the second heat exchanger (15) receiving preheated SO3 rich flue gases from a catalytic converter (17). The stack gases heated to 700°F are passed through a preheat burner (16) to increase the temperature to about 850°F and then transmitted through the catalytic converter (17) to convert most of the sulphur dioxide to sulphur trioxide. The sulphur trioxide rich flue gas is recirculated through the second heat exchanger (15) in order to cool the flue gas, and then fed to the reactor (27) which receives either calcium oxide, calcium carbonate, or both in order to effect SOx removal. The reaction product(s) is quenched to crack the outer shell of calcium sulphate, and then may be selectively resupplied to the reactor (27) or to storage (21, 51). A computerized controller (50) responds to a probe (40) to selectively control the supply of the calcium oxide, calcium carbonate, and resupply of reaction products to the reactor (27). Desulphurized exit gas from the reactor (27) passes through the first heat exchanger (14) for cooling and then through a particle separator (30) before exiting the system (10).
506658
Gowling Lafleur Henderson Llp
Lin Ping-Wha
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