Method and arrangement for removing solid particles and tar component from carbon monoxide gas

An arrangement for removing solid particles and tar component from carbon monoxide gas which contains solid particles and a volatile tar component, said arrangement including

• a gas scrubber, which is arranged to receive carbon monoxide gas from a smelting furnace (1) for scrubbing the carbon monoxide gas by a liquid medium in order to remove part of the solid particles,
• a blower, which is arranged to increase the flow rate of the carbon monoxide gas, and
• a particulate filter, which is arranged to remove solid particles from carbon monoxide gas, characterized in that the arrangement includes a particle feeder, which is arranged in the flowing direction prior to the particulate filter for feeding in the carbon monoxide gas finely divided adsorbent particles comprising coke dust adsorbing the tar component;
• characterized in that the particle feeder includes a venturi pipe for accelerating the carbon monoxide gas flow rate, and a feed pipe, which opens into the venturi pipe for feeding adsorbent particles to the carbon monoxide gas flow with an accelerated flow rate.

A method of cleaning carbon monoxide gas created by smelting ferrochromium in the presence of incompletely coked coke as a reductant, the method comprising:

• scrubbing carbon monoxide gas employing a liquid medium for removing solid particles from the carbon monoxide gas,
• adding finely divided adsorbent particles comprising coke dust to the carbon monoxide gas for adhering tar present in the carbon monoxide gas to the surface of the adsorbent particles, and
• subsequently removing adsorbent particles from the carbon monoxide gas, whereby tar adhering to the adsorbent particles is removed from the carbon monoxide gas,
• and wherein the method comprises, after the scrubbing step and before the step of removing adsorbent particles from the carbon monoxide gas, increasing the flow rate of the carbon monoxide gas.