How to Select RTO equipment for Gas Projects!

One of the key differences between rotary valve RTO and two-bed RTO is the addition of a purge function, which improves gas utilization by 4%. But how exactly does this work?

Two-Bed RTO (Without Purge Function)

The working principle of a two-bed RTO is illustrated below:

As shown, in a two-bed RTO:

1. Waste gas enters Regenerator A, where it is preheated.
2. The preheated gas then flows into the combustion chamber for oxidation.
3. The decomposed high-temperature flue gas passes through Regenerator B, heating its ceramic media before being discharged.
4. The airflow direction is A → B.

After 150 seconds, the poppet valves switch, reversing the airflow direction to B → A:

• Waste gas now enters Regenerator B for preheating.
• After combustion, the hot flue gas exits through Regenerator A, heating its media.

The Problem:

During the switching process, some uncombusted gas trapped in Regenerator A is directly pushed out through the chimney instead of entering the combustion chamber. This results in a 4% loss in gas utilization efficiency.

Rotary RTO (With Purge Function)

To solve this issue, the Rotary RTO introduces a purge zone between the inlet chamber and the outlet chamber.

How It Works:

1. Before a regenerator switches from inlet to outlet mode, clean air is injected to purge any remaining uncombusted gas back into the combustion chamber.
2. Only after this purge step does the regenerator switch to outlet mode, ensuring no gas is wasted.
3. The airflow sequence becomes: A → Purge → B.

Result:

Because the Rotary RTO includes this purge function, it prevents gas loss and improves gas utilization by 4% compared to a two-bed RTO.