In cocurrent systems, the purge gas is 50 to 100 degrees F hotter than the soil discharge temperature.

The purge gas from the second step is recycled and partially used as feed gas in the first step.

Lifters raise the soil, carrying it to near the top of the drum before allowing it to fall through the heated purge gas.

The flow of soil may be either cocurrent with or countercurrent to the direction of the purge gas flow.

Purge gas first enters an afterburner to decontaminate the fine particles, then goes into a cooling unit prior to introduction into the baghouse.

The term "thermal desorber" describes the primary treatment operation that heats petroleum-contaminated materials and desorbs organic materials into a purge gas.

Besides the direction of purge gas flow relative to soil feed direction, there is one major difference in configuration between countercurrent and cocurrent rotary dryers.

VPSA systems apply pressurized gas to the separation process and also apply a vacuum to the purge gas.

Standby and emergency systems: compressor systems requiring standby or purge gases capability are pressure controlled by the shuttle valve.

This waste gas provides purge gas to regenerate the TSA unit and to the cool the refrigeration turbine.

The auger system conveys, mixes, and heats contaminated soils to volatilize moisture and organic contaminants into a purge gas stream.

Because of the higher temperature and volume of the purge gas, the baghouse and all other downstream processing equipment must be larger than in a countercurrent system.

The volatile compounds move into the headspace above the water and are drawn along a pressure gradient (caused by the introduction of the purge gas) out of the chamber.

The purge gas from a countercurrent rotary dryer is typically only 350 to 500 degrees F and does not require cooling before entering the baghouse where fine particles are trapped.

The gases at this point contain only the nitrogen from seals and purge gases and small amounts of hydrofluoric acid that did not condense in the total condenser.

As the nitrogen purge gas exits the void space it passes through an analyzer that is designed to detect if any vinyl chloride is leaking from the internal sphere.

Gas purity sensors are used to indicate the end of the purging cycle, which shortens the startup and shutdown times and reduces consumption of the purging gas.

In addition, because the heated purge gas is introduced at the same end of the drum as the feed soil, the soil is heated faster, resulting in a longer residence time.

After five or six hours at room temperature, a body begins purging gases, and in a small and enclosed space such as this, the effect was worse than the men's room in a Mexican restaurant.

Hydrogen is added to the fuel mix during the gasification process, and Carbon Dioxide is removed by capture from the purge gas 'slip stream' Syngas clean-up and catalytic methanation stages.

Since thermal screws are indirectly heated, the volume of purge gas from the primary thermal treatment unit is less than one half of the volume from a directly-heated system with an equivalent soil processing capacity.

Helium's other industrial uses-as a pressurizing and purge gas, as a protective atmosphere for arc welding and in processes such as growing crystals to make silicon wafers-account for half of the gas produced.

They are more efficient in transferring heat from purge gas to contaminated soil, and the volume and temperature of exit gas are lower, allowing the gas to go directly to a baghouse without needing to be cooled.

Separation of the precursors is accomplished by pulsing a purge gas (typically nitrogen or argon) after each precursor pulse to remove excess precursor from the process chamber and prevent 'parasitic' CVD deposition on the substrate.