EXHAUST GAS PURIFICATION SYSTEM

摘要

[Problem] To provide a highly practical exhaust gas purification system with which a liquid reducing agent such as an alcohol or a hydrocarbon can be added to remove nitrogen oxides (NOx) in the exhaust gas, even when the exhaust gas is in a relatively low-temperature range of 200-400°C, as with a marine diesel engine or the like internal combustion engine, and with which high denitration performance can be maintained without reducing the exhaust gas temperature. [Solution] An exhaust gas purification system wherein a reducing agent supply means and a denitration catalytic bed are arranged in this order from the upstream side in the exhaust passage of an internal combustion engine, with the reducing agent from the reducing agent supply means being added to the exhaust gas upstream from the catalytic bed, thereby reducing nitrogen oxides in the exhaust gas and purifying the exhaust gas. The exhaust gas purification system is characterized by being equipped with a liquid reducing agent storage tank and a compressed air supply means, with compressed air from the compressed air means being supplied to reducing agent that has vaporized in the liquid reducing agent storage tank, thereby producing air containing the vaporized reducing agent, with this air containing the vaporized reducing agent being supplied to the reducing agent supply means.