Oil consumption is about 30g/person_d according to the daily use of oil per capita of residents, and the general volatilization of oil smoke accounts for 2-4% of oil consumption, with an average of 2.83%. The annual working day of this project is 360 days, mainly supplying breakfast and staff meals, according to the most unfavorable situation of 244 trips per day, the project's annual oil consumption of 2.6t/a, resulting in 0.073t/a of oil smoke, collected by the air collection hood, using high-efficiency oil smoke purification facilities, electrostatic oil smoke purifier treatment, oil smoke removal efficiency of up to 90% or more, and then by the low-noise centrifugal ventilator smoke exhaust, the exhaust gas by a special flue Discharged by 1.5 meters above the roof of the building exhaust pipe, the emission of oil smoke 0.0073t / a, the emission concentration of how many mg / m3