COMPACT EXHAUST GAS TREATMENT SYSTEM AND METHOD OF OPERATING THE SAME

摘要

Directing exhaust gas around a catalyst may pre-heat the catalyst and may thereby bring the catalyst quickly in its operating temperature range. An exhaust gas treatment system for treating the exhaust gas may include a first flow path, a second flow path, and a control system. The first flow path may include a catalyst. The second flow path may be coaxially arranged in heat exchange relation with respect to the first flow path. The control system may be configured to control the flow of exhaust gas through the first flow path or the second flow path dependent upon the catalyst temperature.

主权项

1. An exhaust gas treatment system for treating exhaust gas from an internal combustion engine, the exhaust gas treatment system comprising:
a first flow path for the exhaust gas; a catalyst arranged within the first flow path, the catalyst being configured to treat the exhaust gas at a catalyst temperature above a predetermined temperature threshold; a second flow path coaxially arranged in heat exchange relation with respect to the first flow path; and a control system being configured to, when the temperature of the catalyst is below the predetermined temperature threshold, direct the exhaust gas through the second flow path thereby heating the catalyst and, when the temperature of the catalyst exceeds the predetermined temperature threshold, direct the exhaust gas through the first flow path to treat the exhaust gas in the catalyst.