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Blade type demister pad structure and design flow rate
- Jan 24, 2019 -

The flow rate of the blade type demister pad passing through the blade type demister is too low, which is not conducive to gas-liquid separation, and is also unfavorable for the defogging effect. In addition, the loss of 0 meter is low, the size of the absorption tower is increased, and the investment is also increased. The design flue gas flow rate should be close to the critical flow rate. According to the blade structure and arrangement of different vane mist eliminators, the design flow rate is generally selected between 3.5-5.5 m/s, and the flue type can be between 3.5-7.0 m/s.

 

Vane demister pad structure

The vane type mist eliminator is composed of a swirl plate, a cylindrical cover, a retaining ring, a cylinder body and a return pipe.

1. Swirl plate The function of the swirl plate is to make the gas rotate and use the centrifugal force to squirt the mist to the wall of the tube. It consists of a piece of metal plate 1 to 2 mm thick, which is cut according to the designed blade tooth fraction, and then the blade is turned up. The blade elevation angle is generally 25°, and the radial angle β is greater than 90°, that is, the outer end is turned up, and the inner end is connected. The metal itself, the center circle is blind.

2. The role of the cylindrical cover is to collect the liquid flowing down the wall so as to avoid secondary entrainment by the rotating gas. Since the metal cover welded on the swirl plate has a certain gap with the tower wall, the liquid under the flow can be collected, and the rotation is reduced. The amount of liquid on the flow plate. At the same time, the conditions for the return of the collected liquid to the lower tray are also created. The height of the hood is related to the amount of entrainment and the pressure drop of the swirl plate itself.

 

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