Abstract: The compositions and behavior of emission gas from loading in refineries were investigated. The industrial technologies applied in waste gas collection at loading sites, gas entraining control, and treating process were analyzed. The results showed that the NMHC concentration increases gradually during loading, the automatic flow control can be realized by adopting gas-intake pressure control. The discharged waste gas at the dock loading was purified by the low temperature distillate oils absorption and adsorption technique, the NMHC concentration can be reduced to lower than 6.1×104 mg/m3, and purification efficiency reaches as high as 99.3%. By low temperature distillate oils absorption and catalytic oxidation for waste gas from loading rack, the NMHC concentration in purified gas is lower than 7.9 mg/m3, and purification efficiency closes to 100%.

Key words: loading, waste gas collection, gas feeding control, NMHC, low temperature distillate oil, absorption, adsorption, catalytic oxidation