(1) According to the number of furnaces n, take the air volume of each furnace hole as 2000m3/h, and the required air volume of the purifier =? n×2000？ Cubic meter/hour. When the coke holes are large and the working smoke concentration is high, it is necessary to increase the required air volume of each coke hole to 3000-4000m3/h to achieve the purification effect.

(2) When the smoke collecting furnace is very long and there are many intermediate devices, the total handling air volume Q of the range hood can be determined according to the calculation method of the total projected area S of the smoke outlet (smoke collecting hood) and the surface wind speed V of the furnace.

The specific formula is as follows:

Q=SXV×3600m3/h？ V- Take (0.5-0.6) m/s-Calculate by length × width.

(3) Selection of fans corresponding to kitchen fume purifier

Calculation of pipeline resistance: pipeline resistance includes local resistance (resistance caused by variable diameter pipe, elbow and inlet and outlet) and resistance along the pipeline (resistance caused by straight pipe).

Calculate the total pressure of fan = (pipeline resistance+equipment resistance) × 1 15%.

Pipeline resistance = resistance along the line+local resistance (see ventilation data for specific calculation method)

Equipment resistance = 150-200pa

Calculate fan air volume = purifier air volume x? ( 1 15- 150)%

This paper introduces in detail the price of oil fume purifier in small restaurant and the calculation method of air volume of kitchen oil fume purifier.