Patent ID: 9080286
Filing Date: 2015-07-14
Classification: D21C

Abstract:
1. A system to treat odorous gases in a pulp mill comprising: a combustion device having inputs receiving the odorous gases and combustion air, in which the odorous gases are combusted with excess air to oxidize compounds in the odorous gases, and having a discharge for flue gas generated by the combustion of the odorous gases; a first stage of a scrubbing unit having a gas inlet receiving the flue gas from the combustion device, a solution inlet coupled to a source of a liquid scrubbing solution to mix with the received flue gas, an outlet for a liquid containing oxidized compounds extracted from the flue gas in the first stage and entrained in the liquid, and a gas outlet discharging scrubbed flue gas from the first stage, and a second stage of the scrubbing unit having a gas inlet receiving the scrubbed flue gas from the first stage, a solution inlet coupled to a source of a liquid scrubbing solution to mix with the received scrubbed flue gas, an outlet for a liquid containing oxidized compounds extracted from the received scrubbed flue gas in the second stage and entrained in the liquid, and a gas outlet for scrubbed flue gas from the second stage wherein the gas outlet directs the scrubbed flue gas to a recovery boiler.