# US 4,397,794 A · Rotary gas washers

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- Number: US 4,397,794 A
- Document ID: US4397794A
- Status: Granted
- Kind: A
- Application number: 06/328,398
- Filed: 1981-12-07
- Granted: 1983-08-09
- Earliest claimed: 1980-12-11
- Inventors: Claes W. Pilo
- Web page: https://patentgrep.com/patent/US4397794A

## CPC

- B01D 47/16: Apparatus having rotary means, other than rotatable nozzles, for atomising the cleaning liquid
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)

## Abstract

A rotary gas washer with a droplet generator formed by a ring of radially extending blades mounted for rotation about a vertical axis as liquid is distributed over the blades so droplets are shed at the peripheral surfaces. A gas inlet scroll directs the inlet gas to an annular reaction space about the generator periphery. The outlet scroll is directly above the inlet scroll and connected thereto by a vertical duct having approximately the same diameter as the ring.

## Claims

### Claim 1

A rotary gas washer comprising a casing in which is arranged a droplet generator including a ring of radially extending blades or wings mounted for rotation about a vertical axis and means for distributing liquid over the surfaces of the wings or blades so that during rotation liquid is accelerated by the blades and flows to the peripheral edge of the surfaces from where it is shed to form streams of liquid droplets, a gas inlet scroll for directing the inlet gas to flow around the generator with a radially inward component of velocity and having a height adjacent the generator substantially equal to the axial height of the generator, and a gas outlet scroll having an inlet directly above the inlet scroll and connected thereto by a vertical duct having approximately the same diameter as said ring of blades or wings, wherein the radially innermost portion of the peripheral wall of the inlet scroll is spaced from the periphery of the generator by a predetermined minimum distance to provide around the generator an annular reaction space within the scroll for interaction between the shower of droplets and the gas.

### Claim 2 (depends on 1)

A rotary gas washer according to claim 1 wherein the ring of wings or blades is mounted upon a rotor and acts to distribute liquid in the form of streams of liquid droplets, to another rotor surrounding the first.

### Claim 3 (depends on 1)

A rotary gas washer according to claim 1 wherein the outer periphery of the annular reaction space is defined by a barrier to the outward flow of liquid droplets, which has openings to admit the said flow of gas having radially inward and tangential components of velocity.

### Claim 4 (depends on 3)

A rotary gas washer according to claim 3 wherein the barrier comprises a ring of guide vanes, the vanes in the ring being spaced so as to provide openings for the flow of gas equally spaced at intervals around the annular reaction space.

### Claim 5 (depends on 1)

A rotary gas washer according to claim 1 several concentric cylinders are arranged coaxially within the vertical duct to divide the duct into a plurality of annular passages communicating between the inlet and outlet scrolls.

### Claim 6 (depends on 1)

A rotary gas washer according to claim 1 wherein the width of the reaction space is at least 20% of the radius of the generator.

### Claim 7 (depends on 1, 6)

A rotary gas washer according to claim 1 or 6 wherein the distance between the wings of the radially outer periphery of the ring is at least 20 mm for each meter length of the radius of the generator.