Wet Ventury Scrubbers :

COMPONENTS

1. VENTURY

Venturi is the most important component of the system. The venturi has a converging, straight & diverging portion as shown in figure .  The gas is accelerated in the venturi. The liquid is sprayed just above the throat of the throat of the venturi covering the entire gas path. The contaminants impact on the finely sprayed droplets and become heavier.   The velocity of gas at venturi throat decides the pressure drop of the gas stream and the particle separation efficiency.   The venturi construction is simple to operate, easy to clean and has better particle separation efficiency at low pressure drop.

2.      CYCLONE SEPARATOR

The liquid & gas pass to cyclone type mist eliminator to separate the liquid from the gas. The liquid droplets along with solids and gas are introduced in the cyclone tangentially. The centrifugal force on droplets throw them on cyclone wall and get separated. The clean gas pass out of the cyclone.Advantages of cyclone are-

•   Low pressure drop.

•   Simple in construction.

•   Easy to clean.

•   High particle separating efficiency.

3.   I. D. FAN

The I. D. Fan sucks the gas through the system and leaves it to chimney. It takes care of the pressure drop in the system.

Salient Features

• ·        Designed for the required duty point.

• ·        High efficiency – upto 80%.

• ·        Tested for performance.

• ·        Tested for vibrations as per IS 1940.

• ·        Tested for rise in bearing temperature.

• ·        The bearing block is single piece machined component – alignment & rigidity.

• ·        Drain plug for condensate removal.

• ·        Access door for inspection/cleaning.

• ·        Damper at outlet to control airflow rate.

• ·        Manometer tapping at inlet & outlet.

• ·        Direct driven & belt driven construction.

• ·        Guard at air inlet & belt – safe installation.

•          Rigid base frame and supports – vibration free performance

4. Circulation Tank

It holds the liquid to be circulated for scrubbing and receives the liquid from the cyclone. The tank size has to be adequate to avoid frequent change of liquid. Then solids separated from gas are collected in the tank that increases its concentration in the liquid. Increase in solids concentration beyond design concentration adversely affects the spray characteristics. If the gas to be scrubbed is at higher temperature, part of scrubbing liquid will evaporate and lost. This should be compensated by topping up the circulated tank intermittantly. Drain is provided to clean the tank.

5. Spray System

This consists of inlet filters, circulation pump, valves, pipeline, pressure gauges & switches, orifice type flow meter, and nozzle assembly.