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AIR POLLUTION CONTROL EQUIPMENT SELECTION GUIDE - CHAPTER 11

Lọc khí máy móc hỗ trợ được định nghĩa là các thiết bị sử dụng một cơ chế di chuyển trong dòng khí để đạt được mong muốn hạt, hoặc loại bỏ khí gây ô nhiễm. Lọc khí máy móc hỗ trợ thường được sử dụng để kiểm soát bụi liên quan đến hạt lớn hơn đường kính khoảng 10 micromet và trội thấp (dưới 5 GRS / dscf). Họ đã được sử dụng để kiểm soát bụi từ các thiết bị bốc xếp, kẻ chạy trốn bụi từ các cơ sở lưu trữ, hoạt động lớp phủ ướt, và. | chapter 11 Mechanically aided scrubbers Device type Mechanically aided scrubbers are defined as devices that use a moving mechanism in the gas stream to achieve the desired particulate or contaminant gas removal. Mechanically aided scrubbers are generally used for dust control involving particulate larger than approximately 10 pm diameter and at low loadings below 5 grs dscf . They have been used to control dusts from loading and unloading facilities fugitive dusts from storage facilities wet coating operations and numerous other applications. They were particularly popular in the 1970s in the mining industry for dust control where a wet product was required and are still used for that purpose. They are noted for their low cost compact size and reliability. Ever tightening codes have shifted the focus to low- to medium-energy Venturi scrubbers on many applications that had been dominated by mechanically aided designs. Typical applications and uses These designs are used to control high dust loadings of relatively large dust where it is desirable to recover the dust wet. Controlling dust from conveyors blenders mullers mills and other high dust loading sources are areas with this type scrubber has been used. In these applications the dust is usually returned to the process as wet slurry or is separated in a pond or clarifier. They are effective on particles 10 pm or larger. They are not used as much where the particulate is hygroscopic and may build up on the scrubber inlet. Similarly they are not used for gas absorption although they may be used ahead of a gas absorption device such as a packed tower . Their compact size and low cost make them attractive where codes allow for general dust control applications. 2002 by CRC Press LLC Operating principles As was mentioned previously it is believed that a given amount of energy input into a gas cleaning device is required to achieve a given amount of pollutant removal the equivalent energy theory . This energy may be .