Exhaust gas purifying apparatus, exhaust gas purifying method, and particulate matter measuring method

摘要

An exhaust gas purifying apparatus comprises a primary diesel particulate filter (22) provided in an exhaust line (21) of a diesel engine, a secondary exhaust line (21A) branched from the exhaust line from an upstream side of the primary diesel particulate filter (22), a secondary diesel particulate filter (22A) provided in the secondary exhaust line (21A), the secondary diesel particulate filter (22A) having a soot storage capacity smaller than the soot storage capacity of the primary diesel particulate filter (22), and a differential pressure measuring part (22B) measuring a differential pressure between an inlet and an outlet of the secondary diesel particulate filter (22A).