Method of safely emitting high-temperature exhaust gas for offshore platform, and cooling and purification device

A process for discharging high-temperature flue gas safely from an ocean platform, wherein the process comprises steps of:

• discharging high-temperature flue gas, of a type which affects flight safety of take-off and landing of a helicopter, from combustion facilities of the ocean platform, having a flight area for take-off and landing of the helicopter, into a main body of a cooling and cleaning device through an exhaust pipe for high-temperature flue gas of the combustion facilities, while sea water is injected into the main body of cooling and cleaning device;
• wherein,
• the injected sea water passes through a water distributor located at an upper part in the main body of the cooling and cleaning device, and is sprayed downwards from the water distributor to be used as scrubbing sea water;
• the high-temperature flue gas enters into a lower part under the water distributor from an inlet for high-temperature flue gas located at a lower part in the main body of the cooling and cleaning device, and the high-temperature flue gas is scrubbed by the sprayed sea water to be low-temperature clean flue gas;
• the low-temperature clean flue gas passes through the water distributor and a mist eliminator for removing liquid drops which is located over the water distributor, and is discharged into atmosphere finally through an outlet for low-temperature clean flue gas located at a top of the main body of cooling and cleaning device;
• and
• the sea water for scrubbing the high-temperature flue gas is collected to a liquid pool located at a lower part of the main body of cooling and cleaning device and then discharged into the ocean.