At present, converter gas dedusting is mainly divided into dry dedusting Semi dry dedusting And wet dedusting. After the converter gas is generated, it first enters the vaporization cooling flue, and the gas temperature decreases from 1500 ℃ to 900 ℃, then it enters the gas dedusting system.

1 Dust removal technology summary

1. Dry dedusting

The converter gas enters the evaporative cooler, and the gas is directly cooled to 200 ℃ by spraying water mist through the atomizing nozzle. The amount of water spray is precisely controlled according to the heat released by the gas, and the sprayed water mist is completely evaporated; At the same time of cooling by spraying water, the gas is tempered, so that the specific resistance of dust is conducive to Electrostatic precipitator Capture of. The evaporative cooler can collect about 30% of the dust (mainly large particle dust) in the gas. The flue gas after cooling and tempering enters the electrostatic precipitator, and the charged dust moves to and deposits on the dust collector under the action of electric field force, further reducing the dust content of gas. The purified gas is sent to the gas cooler to cool down to about 70 ℃. Finally, according to the carbon monoxide and oxygen content in the gas, decide to recover or release it.

2. Semi dry dedusting

The converter gas enters the evaporative cooler, and the water mist injected by the atomizing nozzle of the evaporative cooler evaporates completely to absorb the gas heat. The gas is cooled down to 200 ℃, and then sent to the circumferential seam adjustable throat venturi for fine dust removal. The circulating water sprayed at the throat of the venturi is fully contacted with the dust in the gas after atomization, and the dust is wetted. The dust laden water drops enter the dehydrator and are separated from the gas, and the gas is further dedusted.

three Wet Tawen remove dust

The converter gas enters the spray scrubber, which sprays a large amount of cooling water to reduce the gas temperature to the saturation temperature (about 70 ℃) and capture the coarse particle dust in the gas to achieve the purpose of coarse dust removal. Then the converter gas is sent to the annular seam adjustable throat venturi for further fine dust removal. The circulating water sprayed at the throat of Venturi tube is fully contacted with the dust in the gas after atomization, and the dust is wetted. The dust laden water drops enter the elbow dehydrator and the cyclone dehydration tower, and the dust laden water drops are separated from the gas to achieve further dust removal. The annular gap adjustable throat venturi can not only remove dust, but also adjust the micro differential pressure at the converter mouth.

4. Wet binary dedusting

The converter gas enters the overflow venturi (one venturi), and a large amount of cooling water is injected into the overflow venturi to reduce the gas temperature to the saturation temperature. At the same time, the coarse particle dust in the gas is removed, and then it enters the gravity baffle dehydrator for dehydration. After dehydration, it enters RD rectangular venturi (Erwen) for fine dedusting. Dusty water droplets are separated from gas in elbow dehydrator and cyclone dehydrator, and converter gas is further dedusted.