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Sulfur Reactor

Sulfur Reactor
The transport reactor for warm-gas sulfur removal is a sorbent gas–solid contactor. The sorbent is separated and recycled through the system and can be removed during operation for replacement when spent. This system can be used in conjunction with any small-scale gasifier.

Operating Conditions

  • Temperature: 300°–1000°F (150°–540°C)
  • Pressure: up to 1000 psi

Process

Sulfur sorbents are introduced from the feed hopper via a screw feed motor. The sorbents contact the gas stream and are moved upward through the riser and across the top horizontal section. The sorbents and flue gas are then separated in the primary cyclone. The sorbents fall into the standpipe while the syngas exits the top of the reactor and onto the hot-gas filter vessel for fine particulate removal. The sorbents in the standpipe are recycled back to the riser via a second screw feed motor.

The speed of the recycle screw feeder can be adjusted, which allows for variation of the sorbent recycle rate. Pressure drop is measured in the riser, which allows for calculation of the recycle rate. Standpipe pressure drop is also measured to determine the amount of sorbent accumulated in the standpipe. Nitrogen purges are used to keep the pressure taps free of particulate.

Sorbent can be removed from the system for analysis while testing is in progress via a double-valve hopper system. This also allows for the removal of spent sorbent and the addition of fresh sorbent while the system is running. The reactor has utilized sorbent for shakedown testing and a commercial sorbent for sulfur capture testing.