Glossary
HRSG and gas path
Dust catcher
Also known as blast furnace dust catcher, inertial separator.
A dust catcher is a large vertical inertial separator at the front of a blast-furnace gas-cleaning train. Top-gas from the blast furnace enters at the top, the gas slows as it expands into the large vessel, and coarse particulate falls out under gravity into a discharge hopper at the base.
Where it sits in the cleaning train
| Step | Equipment |
|---|---|
| 1 — coarse separation | Dust catcher |
| 2 — fine wet cleaning | Venturi scrubber |
| 3 — final polish | Wet ESP or baghouse |
Cleaning the dust catcher
The dust-catcher hopper accumulates large quantities of coarse iron-bearing dust and is prone to bridging. Sonic horns at the hopper outlet keep the dust flowing and reduce interruptions to the gas-cleaning train.
Related terms
Related terms
- Cyclone separatorA cyclone separator removes particulate from a gas stream by centrifugal force. Wall build-up and re-entrainment from the dipleg are the dominant operational issues.
- Venturi scrubberA Venturi scrubber atomises scrubbing liquid into a high-velocity throat where it intercepts and traps fine particulate. Common on blast-furnace gas cleaning and chemical off-gas duty.