Denitrification desulfurization apparatus and land and ship internal combustion engine using the same

摘要

PROBLEM TO BE SOLVED: To enable a single denitrification catalyst to simultaneously perform both denitrification and desulfurization of exhaust gas from an internal combustion engine which burns heavy oil.SOLUTION: A denitrification and desulfurization device comprises: a supercharger 104 which supplies air to an internal combustion engine 102 using energy of exhaust gas; reducing agent supply means 12 which injects a reducing agent to treat nitrogen oxide; and a denitrification catalyst 10 which reacts the nitrogen oxide with the reducing agent. The denitrification catalyst 10: is arranged in a passage at a downstream side of the supercharger 104; keeps a temperature of the exhaust gas passing through the denitrification catalyst 10 within a temperature range not less than 150°C and not more than 280°C; and simultaneously performs denitrification of the exhaust gas and absorption of acidic ammonium sulfate produced by the reaction of sulfur oxide with the reducing agent onto the denitrification catalyst 10 under a condition that a space velocity obtained by diving an amount of the exhaust gas passing through the denitrification catalyst 10 by a volume of the denitrification catalyst 10 is kept in a range not less than 500hand not more than 2700h.SELECTED DRAWING: Figure 1