Tri Lobe Blower : Are They Still in The Most Energy Efficient Blower Category?

Air blowers are widely used in various industrial processes like the treatment of wastewater, manufacturing, natural gas production, power generators etc and often contribute to large consumption of electricity costs. In the past fifty years, technical evolution in the blower industry has been very slow, where the market was flooded with blowers working on the small volume. To reduce the discharge pulsation levels, Lobe style blowers have evolved from twin to tri-lobe designs. But when it comes to being energy efficient, they still need more significant improvements.

Rotary lobe blowers are positive displacement blowers which with the help of twin or Tri-lobe rotating in the opposite direction disperse the air or gases within or outside the system. There are two rotors attached to the blower. The main rotor is driven by external forces, usually electricity supply and hence mostly they are called as a driving rotor. Whereas the other rotor depends on the movement of the driving rotor and is called as a driven rotor. When the rotors start their movement, the air is drawn from the inlet and is forced towards the outlet against the system pressure. The volume of air present is the system remains constant while the air is only dispersed from place to the discharge chamber. The twin lobe blower is based on the old technology. The pulsation of the twin lobe blower is very low compared to the blower with three lobes. The Tri-lobe blower has two major advantages:

1. • The rotor tips are at 180 degrees compared to twin lobe in which it is at 120 degrees with each rotor, the resistant deflection is not in angular direction rather is stiff towards the lobe thereby minimizing the load and hence becoming more efficient in dispersing the air or gases in the system.

     1. Same orientation provides wider and even distribution of load, thereby reducing the level of noise.

Screw blowers work on the principle that not all air applications within the system require or produces the same amount of air or gases when the blower works to its full capacity. Therefore, screw blower provides the flexibility of changing the amount of volume of air flow in the system as per the requirement of the process at a given time. They comprise of two rotors namely male and female which move towards each other while the air between them reduces and increases according to the movement.

Recently, blowers encompassed with screw technology have gained momentum. From the point of view of a customer, it's really difficult to compare the energy consumption of two kinds of blowers. Lobe type blowers data are easily found and can be calculated using air intake volume flow to the shaft power requirement. But for comparing the screw technology, it is more difficult. Hence, in order to make the comparison, their efficiencies and losses are calculated. Further, compared it was found that screw technology is better for tri-lobe blowers as it reduced the loss of air within the system and consumes electrified approximately one-third of the total consumption by the lobe blower.

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