DEVICE FOR RECOVERING CARBON DIOXIDE OF BOILER

摘要

PURPOSE:To efficiently treat carbon dioxide contained in exhaust gas generated in a boiler. CONSTITUTION:An oxygen separator 8 for separating oxygen 6 and nitrogen 7 contained in air 5 is provided on the way of an air supply path 4 of a boiler 1. An oxidizing device 12 which oxidizes nitrogen monoxide and sulfur dioxide contained in exhaust gas 9 to obtain nitrogen dioxide and sulfur trioxide is provided on the way of an exhaust gas duct 3 of the boiler 1. The following cooler 14 is provided in the outlet side of the oxidizing device 12. The cooler 14 cools the exhaust gas 9 oxidized by the oxidizing device 12 to condense and separate moisture 13. Moreover, water 18 is supplied to the inside of the cooler 14 and nitrogen dioxide and sulfur trioxide are dissolved. Nitric acid 19 and sulfuric acid 20 are removed from the cooler 14. A carbon dioxide liquifying device 16 which compresses and cools exhaust gas 9 and liquifies carbon dioxide 15 is provided to the outlet side of the cooler 14.