L'air Liquide, Soci&#xe9;t&#xe9; Anonyme Pour L'etude Et L'exploitation Des Proc&#xe9;d&#xe9;s Georges Claude

American Air Liquide, Inc.

Maicon Renan Neryz

Vasuhi Rasanayagam

Joerg Schwerdt

Milson Carvalho

Chunqiong Shi

Luiz Rodrigues

Ivan Pajolli

Luiz Felipe Rodrigues

A device and method for injection of oxygen-rich gas into a body of liquid with oxygen recycling are disclosed. The device comprises a rotary hollow shaft vertically passing through a float partially immersed in the liquid, an impeller attached to the lower end of the rotary hollow shaft, a columnar structure, surrounding the rotary hollow shaft, mounted on the bottom side of the float and vertically extending into the liquid, a gas diffusion chamber formed by the columnar structure, the float and the liquid surface under the float, and a gas injection conduit passing through the float for delivering the oxygen gas into the gas diffusion chamber, wherein a vacuum is generated in the body of the liquid around the impeller when the impeller is driven to rotate, so that the oxygen-rich gas in the gas diffusion chamber is sucked into the body of the liquid and mixed therein.

Gas injection and recycling apparatus and methods

The present invention describes a portable device for monitoring and controlling the level of residual oxygen in reflow oven atmosphere (). This referred equipment is able to determine the quality of the atmosphere of a reflow oven, using parameters predetermined by the user. Therefore, the equipment performs the monitoring of the reflow oven atmosphere () controlling the level of residual oxygen of the reflow oven () by increasing or decreasing of the feed flow rate of nitrogen by the control that the microcontroller exerts over the proportional valve of nitrogen flow control (), by opening or closing the valves to kept such predetermined values.

Portable equipment for monitoring and controlling the level of oxygen in reflow oven atmosphere

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Sao Paolo, Brazil

Maicon Renan Neryz