Grind the dust air suction hood

Dust air suction hood polishing dust collection of gas suction hood in occupies an important position in the design of system energy-saving, imagine, if the dust removal efficiency of dust collector or fan efficiency increased by 1% ~ 3% is very difficult, but if the gas collecting dust hood increased by 1% ~ 3%, much easier. Grinding dust dust hood position (1) set the location of the exhaust hood, eliminate the enclosure should be considered positive pressure, maintaining negative pressure in place even, effective control of dust air does not escape from the enclosure, and avoid suck out powder. Such as crushing, screening and transportation equipment, dust hood should avoid dust air centre, in case the suck out a large amount of powder. For belt conveyor by feeding point dust hood and discharging chute on both sides of the adjacent distance between chute side length of 0. 75-1. Five times, but no less than 300 ~ 500 mm, the dust hood mouth from the tape machine surface height not less than tape machine width of 0. 6 times. When discharging chute and tape machine leaning way, should be in the front of the discharge chute is decorated dust hood; When discharging chute and vertical tape machine material, appropriate before discharging chute, behind all has aspiration. (2) when handling or transporting materials in heat, the top of the exhaust hood should be located in an airtight cover, or feeding point and the point set, convulsions (3) under the vacuuming shoulds not be close to the enemy on the open hole ( Bore such as operation, observation and discharging mouth, etc. ) , in order to avoid air suction hood outside, waste of energy. Adhesive tape machine by feeding point must be set before dust hood covered dust curtain. (4) the position of the suction hood shall not influence the operation, maintenance, and production. (5) and the dust hood and a best vertical number set, lest cause jams jumped into the material. Grinding dust precipitator dust in the form of (1) conditional dust source should be used as an airtight cover or half airtight cover, avoid breathing dust gas source. (2) to make the enclosure uniform flow, reduce resistance generally adopted. (3) when from airtight cover and bin exhaust, generally no suck out powder and facility dust hood, the air duct directly on the airtight cover or bin. Take over should be between the cover and variable diameter pipe in order to reduce the local resistance grinding dust dust hood (1) the mouth of the wind speed of dust hood cover mouth average wind speed is unfavorable and exorbitant, so as not to suck out powder and waste of energy. The general local airtight cover and light dry, thin material, cover mouth according to the average wind speed is low. Using local sealing, dust hood cover mouth should not be greater than the average wind speed of 3 m/s. Cannot set an airtight cover and (2) in the bulk control dust mask, cover mouth wind speed should be according to the suction side sucking hoods or cover for design calculation.

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