Method for mixing gas-free liquid oxidant with process liquid

Patent metadata

Field	Value
Publication number	US-11084744-B2
Application number	US-201815938870-A
Country	US
Kind code	B2
Filing date	Mar 28, 2018
Priority date	Mar 28, 2018
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

Disclosed are systems and methods for mixing a gas-free liquid oxidant with a process liquid to form a homogeneous and gas-free mixture with minimized degassing. The mixing system comprises an injection device, integrating with a pipe through which a process liquid flows, configured and adapted to inject a gas-free liquid oxidant into the process liquid, and a mixer, fluidly connected to the pipe and the injection device, configured and adapted to mix the process liquid and the gas-free liquid oxidant therein to form a homogeneous and gas-free mixture of the process liquid and the gas-free liquid oxidant with minimal degassing. The method comprises the steps of a). injecting the gas-free liquid oxidant into the process liquid, and b). mixing the gas-free liquid oxidant and the process liquid to form the homogeneous and gas-free mixture. The gas-free liquid oxidant is ozone strong water.

First claim

What is claimed is:

1. A mixing system, the mixing system comprising:
an injection device, integrating with a pipe through which a process liquid flows, configured and adapted to rapidly dilute a gas-free liquid oxidant in the process liquid by injecting the gas-free liquid oxidant into the process liquid through injection nozzles,
wherein the gas-free liquid oxidant is a pressurized gas-free high concentrated or saturated or close to saturated ozone dissolved water, which under atmospheric conditions is supersaturated,
wherein a concentration of ozone dissolved in liquid in the gas-free liquid oxidant is up to 300 mg/L,
wherein the gas-free liquid oxidant has an elevated pressure being higher than a pressure of the process liquid;

a feed-forward or a closed-loop control, configured and adapted to control a mixing ratio between the process liquid and the gas-free liquid oxidant by adjusting flow rates of the process liquid and the gas-free liquid oxidant, respectively, so that the elevated pressure of the gas-free liquid oxidant is maintained until the gas-free liquid oxidant is injected into a main flow of the process liquid, resulting in a rapid dilution of the gas-free liquid oxidant in the process liquid upon injection, thereby avoiding degassing; and
a mixer, fluidly connected to the pipe and the injection device, configured and adapted to mix the process liquid and the diluted gas-free liquid oxidant therein to form a homogeneous and gas-free mixture,
wherein the homogeneous and gas-free mixture has a pressure close to or the same as the pressure of the process liquid.

2. The mixing system of claim 1 , wherein the injection device includes a plurality of conduits, each extend radially through openings in the pipe and are bent along a flow direction of the process liquid in the pipe to provide an extending terminal section.

3. The mixing system of claim 2 , wherein the extending terminal sections of the plurality of conduits each are connected to an injection nozzle.

4. The mixing system of claim 3 , wherein the extending terminal sections of the plurality of conduits include a center extending terminal section placed along the axis of the pipe symmetrically surrounded by the rest of the extending terminal sections.

5. The mixing system of claim 2 , wherein the number of the plurality of conduits ranges from 1 to 20.

6. The mixing system of claim 2 , wherein the number of the plurality of conduits is 5.

7. The mixing system of claim 1 , wherein the gas-free liquid oxidant is ozone strong water.

8. The mixing system of claim 1 , wherein the process liquid is fresh water, tap water, process water, effluent water, municipal and industrial wastewater, wastewater already treated by the secondary treatment process.

Assignees

• Air Liquide
• Air Liquide American

Inventors

• Mante Jan
• Rasanayagam Vasuhi
• Joy Midhun

Classifications

• B01F23/23

  by introducing gases into liquid media, e.g. for producing aerated liquids · CPC title

• B01F23/19

  Mixing systems, i.e. flow charts or diagrams; Arrangements, e.g. comprising controlling means · CPC title

• B01F25/31322

  used simultaneously · CPC title

• B01F23/454

  by injecting a mixture of liquid and gas · CPC title

• B01F23/29

  Mixing systems, i.e. flow charts or diagrams · CPC title