Pressurizing feed gas with venturi

In summary, "Pressurizing feed gas with venturi" involves using a venturi system to increase the pressure of gas entering a process. The venturi effect, created by a reduction in pipe diameter, accelerates the gas flow and induces a drop in pressure, which can be harnessed to compress incoming feed gas. This method is efficient and can enhance the performance of gas delivery systems in various applications, potentially improving energy efficiency and operational effectiveness.
  • #1
Dgasman
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TL;DR Summary
I am looking into spme systems for injection of ozone gas into water. I am in no way an engineer, looking for some advice. Some systems Ive looked at pressurize the gas, whereas normally venturis use suction to pull the gas in. What is the effect of pressurizing this gas in terms of bubble size and mass transfer of gas into solution?

Does this make sense?
Gas flow rate: 20lpm
Gas: 10% ozone
Injected into water
Water flow rate: 120GPM
Mazzei Injector: 784
 
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  • #2
The Mazzei data sheets do not list inlet pressure for the gas, so I assume that the gas is at atmospheric pressure. Increasing gas pressure will increase the gas flow rate.

As for bubble size and mass transfer, my old copy of Chemical Engineers' Handbook, 5th Edition, by Perry and Chilton has a section titled Gas-In-Liquid Dispersions that discusses exactly that. They do not mention venturi mixers, possibly because other methods work better. One of the methods discussed is porous septa, which are available in many different pore sizes. One of these might work better for you than venturi mixers because you have control over the bubble size. They are also sold to hobbyists as air stones for aquariums.
 
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FAQ: Pressurizing feed gas with venturi

What is the principle behind using a Venturi for pressurizing feed gas?

The Venturi effect is based on Bernoulli's principle, which states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure. In a Venturi system, feed gas is accelerated through a constricted section of the pipe, causing a drop in pressure that can be harnessed to draw in and pressurize additional gas or fluids.

How efficient is a Venturi system for pressurizing feed gas compared to other methods?

Venturi systems are generally less efficient than mechanical compressors in terms of energy consumption and pressure increase. However, they have advantages in simplicity, reliability, and maintenance, making them suitable for specific applications where these factors are more critical than maximum efficiency.

What are the common applications of Venturi systems in gas pressurization?

Venturi systems are commonly used in applications such as gas mixing, chemical processing, and waste gas treatment. They are particularly useful in scenarios where the simplicity and reliability of the system are paramount, or where the gas being pressurized is at a relatively low pressure.

What are the limitations of using a Venturi for pressurizing feed gas?

The primary limitations include lower efficiency and the inability to achieve very high pressures compared to mechanical compressors. Additionally, Venturi systems require a sufficient initial pressure drop to function effectively, which may not be available in all situations.

How do you optimize a Venturi system for pressurizing feed gas?

Optimization involves careful design of the Venturi geometry, including the diameter of the throat and the angle of the converging and diverging sections. Proper tuning of these parameters can maximize the pressure recovery and efficiency. Additionally, ensuring that the feed gas flow rate and initial pressure are within the optimal range for the specific Venturi design is crucial for effective operation.

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