Device for degassing liquids

Patent metadata

Field	Value
Publication number	US-10150060-B2
Application number	US-201314405799-A
Country	US
Kind code	B2
Filing date	May 22, 2013
Priority date	Jun 13, 2012
Publication date	Dec 11, 2018
Grant date	Dec 11, 2018

Abstract

A degassing chamber is disclosed, adapted for the efficient removal of entrained gases from liquids. In a preferred embodiment the degassing chamber is combined with and works in conjunction with a sedimentation tank to provide an efficient clarification station. The combined clarification station can have a “footprint” the same size as, or only slightly larger than, the footprint of the sedimentation tank alone. The degassing chamber is well-suited for retrofitting, and can easily be combined with most types of solid-liquid sedimentation tanks that are currently used in the industry.

First claim

What is claimed:

1. An apparatus that is adapted for degassing a liquid that initially contains both entrained gas bubbles and suspended solid particles, prior to transporting the de-gassed liquid to a sedimentation tank that is adapted to remove suspended solid particles from the liquid;
wherein:

said apparatus comprises a degassing chamber, one or more stand pipes, a feed trough, and a plurality of feed wells; wherein said feed trough has an annular shape;
and wherein:
(a) (i) said degassing chamber comprises one or more inlets for receiving a pressurized, superheated liquid that initially contains both entrained gas bubbles and suspended solid particles; (ii) said degassing chamber comprises one or more outlets for transporting de-gassed liquid to said feed trough; (iii) the shape and dimensions of said degassing chamber adapt the degassing chamber to be positioned immediately above the sedimentation tank or within the sedimentation tank, such that, when the degassing chamber and the sedimentation tank are both in operation, the level of liquid in the degassing chamber is from about 0 cm to about 65 cm above the level of liquid in the sedimentation tank; (iv) the ratio of surface area to volume within said degassing chamber is between about 1.5 meter −1 and about 10.0 meter −1 ; (v) said degassing chamber is adapted to allow the pressurized, superheated liquid to boil rapidly by reducing its pressure to about 1 atmosphere, whereby the rapid boiling causes most of the entrained gas bubbles to escape from the liquid;
(b) said one or more stand pipes are affixed to the top of said degassing chamber; each of said stand pipes is open to the interior of said degassing chamber, and each of said stand pipes is also directly or indirectly open to the atmosphere; and the height and diameter of said stand pipes are adapted to allow escaping gases from said degassing chamber to be vented to the atmosphere, without allowing liquid to escape from said apparatus;
(c) said feed trough is adapted to receive de-gassed liquid from said degassing chamber via said one or more outlets, and to deliver de-gassed liquid to said feed wells; wherein the positioning of said one or more outlets, the positioning of said feed wells, and the shape and dimensions of said feed trough are all sufficiently symmetric that, in operation, the flow of de-gassed liquid to each of said feed wells is equal or nearly equal, such that any imbalance in the flow rates to said feed wells is insufficient to induce turbulence in the liquid in the sedimentation tank; and
(d) said feed wells are adapted to receive de-gassed liquid from said feed trough, and to deliver degassed liquid into the sedimentation tank at a level that is below the operational surface level of liquid in the sedimentation tank.

2. The apparatus of claim 1 , wherein said degassing chamber has an annular shape.

3. The apparatus of claim 1 , wherein said apparatus comprises two or more of said stand pipes, and wherein the tops of said stand pipes are connected to one another to equilibrate the pressures at each of said stand pipes.

4. The apparatus of claim 1 , wherein the lower end of each of said feed wells comprises a turbulence reduction device to reduce turbulence induced in the liquid in the sedimentation tank caused by the liquid delivered by said feed wells into the sedimentation tank.

5. The apparatus of claim 4 , wherein each said turbulence reduction device comprises:
(a) first and second rigid plates, wherein said first and second plates are about the same size and shape, except that said first plate incorporates a central hole through which one of said feed wells may pass, so that said feed well is positioned to discharge liquid into the space between said first and second plates;
(b) one or more spacers, wherein each said spacer is attached both to said first plate and to said second plate, wherein said spacers hold said first and second plates in a fixed position relative to one another and parallel to one another;
(c) at least four baffles rigidly affixed to said second plate; wherein said baffles are positioned symmetrically relative to the axis that passes through the center of the hole in said first plate and that is also perpendicular to both said plates; and wherein spaces are present between adjacent baffles to allow some liquid to pass between adjacent baffles;

wherein said turbulence reduction device is adapted for use as follows:
(d) when liquid exits said feed well, the liquid impinges upon said second plate; said second plate diverts the flow of the liquid by about 90 degrees, from an approximately linear flow that is approximately parallel to the axis, into a radially outward flow that is approximately parallel to said second plate; and then, when the radially-outwardly-flowing liquid impinges upon said baffles, said baffles further disperse the energy of the flow of the liquid; so that, when the liquid exits the space between said first and second plates, there is essentially no turbulence in the liquid, and there is essentially no turbulence at the interface between the exiting liquid and the liquid already present in the sedimentation tank; and wherein the spaces between adjacent baffles inhibit the formation of any vortices that would otherwise tend to form within a hypothetical, otherwise-identical apparatus in which said adjacent baffles were contiguous to one another, without spaces between adjacent baffles.

6. A combination comprising the apparatus of claim 5 and a sedimentation tank, wherein said apparatus is affixed to the top of said sedimentation tank or within said sedimentation tank; and wherein said sedimentation tank that is adapted to remove suspended solid particles from the degassed liquid.

7. An apparatus that is adapted for degassing a liquid that initially contains both entrained gas bubbles and suspended solid particles, prior to transporting the de-gassed liquid to a sedimentation tank that is adapted to remove suspended solid particles from the liquid;
wherein:

said apparatus comprises a degassing chamber, one or more stand pipes, a feed trough, and a plurality of feed wells; wherein said feed trough has an annular shape;
and wherein:
(a) (i) said degassing chamber comprises one or more inlets for receiving a liquid that initially contains both entrained gas bubbles and suspended solid particles; (ii) said degassing chamber comprises one or more outlets for transporting de-gassed liquid to said feed trough; (iii) the shape and dimensions of said degassing chamber adapt the degassing chamber to be positioned immediately above the sedimentation tank or within the sedimentation tank, such that, when the degassing chamber and the sedimentation tank are both in operation, the level of liquid in the degassing chamber is from about 0 cm to about 65 cm above the level of liquid in the sedimentation tank; (iv) the ratio of surface area to volume within said degassing chamber is between about 1.5 meter −1 and about 10.0 meter −1 ; (v) said degassing chamber is adapted to allow entrained gas bubbles to escape from the liquid;
(b) said one or more stand pipes are affixed to the top of said degassing chamber; each of said stand pipes is open to the interior of said degassing chamber, and each of said stand pipes is also directly or indirectly open to the atmosphere; and the height and diameter of said stand pipes are adapted to allow escaping gases from said degassing chamber to be vented to the atmosphere, without allowing liquid to escape from said apparatus;
(c) said feed trough is adapted to receive de-gassed liquid from said degassing chamber via said one or more outlets, and to deliver de-gassed liquid to said feed wells; wherein the positioning of said one or more outlets, the positi

Assignees

• Kochergin Vadim
• Grimaldo Santiago
• Univ Louisiana State

Inventors

• Kochergin Vadim
• Grimaldo Santiago

Classifications

• B01D19/0021

  by bringing the liquid in a thin layer · CPC title

• B01D19/0036 Primary

  Flash degasification (the other groups take precedence) · CPC title

• B01D21/2427

  The feed or discharge opening located at a distant position from the side walls · CPC title

• C02F1/20

  by degassing, i.e. liberation of dissolved gases (degasification of liquids in general B01D19/00; arrangement of degassing apparatus in boiler feed supply F22D) · CPC title

• C13B20/16

  by physical means, e.g. osmosis or filtration · CPC title