Exhaust gas post treatment device

Abstract

An exhaust gas post-treatment system for purifying exhaust gas from an internal combustion engine, and to a corresponding method. The system includes a particle filter, a device having catalytic oxidation function, and at least one mixing chamber which are combined to form a constructive unit.

1 - 15 . (canceled) 
     
     
         16 . An exhaust gas post-treatment system for purifying an exhaust gas of an internal combustion engine, comprising:
 a particle filter, a device having catalytic oxidation function, and at least one mixing chamber which are combined to form a constructive unit;   wherein (i) the particle filter, the device having the catalytic oxidation function or (ii) the particle filter having the catalytic oxidation function and the at least one mixing chamber, are combined with one another to form the constructive unit, which is situated in a cylindrical container or forms such a container.   
     
     
         17 . The exhaust gas post-treatment system of  claim 16 , wherein the particle filter and the device having catalytic oxidation function are combined to form a particle filter having a catalytic oxidation function. 
     
     
         18 . The exhaust gas post-treatment system of  claim 16 , wherein the cylindrical container has end parts that detachably connect the cylindrical container to elements of the exhaust gas post-treatment system. 
     
     
         19 . The exhaust gas post-treatment system of  claim 16 , wherein the at least one mixing chamber has structures and is configured to mix a supplied exhaust gas stream with a reducing agent to form an exhaust gas/reducing agent mixture that is injected by an injection device or is produced by this device. 
     
     
         20 . The exhaust gas post-treatment system of  claim 19 , wherein the structures of the at least one mixing chamber include guide surfaces that conduct the exhaust gas/reducing agent mixture in a spiral flow pattern to an outlet of the mixing chamber. 
     
     
         21 . The exhaust gas post-treatment system of  claim 16 , wherein downstream from the at least one mixing chamber there is situated at least one catalytic converter device including at least one SCR catalytic converter, ammonia oxidation catalytic converter, and/or diesel oxidation catalytic converter. 
     
     
         22 . The exhaust gas post-treatment system of  claim 21 , wherein the at least one catalytic converter device is accommodated with the constructive unit in the cylindrical container or forms such a container. 
     
     
         23 . An exhaust gas post-treatment system for purifying an exhaust gas from an internal combustion engine, comprising:
 an exhaust gas post-treatment device including a particle filter having a catalytic oxidation function, at least one mixing chamber, and an SCR catalytic converter, which are situated in combined form in a cylindrical container, the exhaust gas post-treatment device converting nitrogen oxides of the exhaust gas resulting from the internal combustion engine at least at times with an efficiency of greater than 50%;   wherein the particle filter having the catalytic oxidation function, the at least one mixing chamber, and the SCR catalytic converter are combined detachably with one another, and   wherein the cylindrical container has at least one removable end part configured to afford access to the particle filter having the catalytic oxidation function.   
     
     
         24 . The exhaust gas post-treatment system of  claim 23 , further comprising:
 an additional catalytic converter device for limiting the ammonia content in the exhaust gas stream exiting from the exhaust gas post-treatment system.   
     
     
         25 . A method for purifying exhaust gas, the method comprising:
 producing, by an internal combustion engine, an exhaust gas having between 2 g NO x /kWh and 12 g NO x /kWh;   conducting the exhaust gas from the internal combustion engine to an exhaust gas post-treatment system, including a particle filter having a catalytic oxidation function and at least one mixing chamber;   providing catalytic oxidation of pollutants and deposition of particles from the exhaust gas using the particle filter having a catalytic oxidation function, and producing a first treated exhaust gas; and   mixing the first treated exhaust gas with a reducing agent in the at least one mixing chamber to form an exhaust gas/reducing agent mixture;   wherein the exhaust gas post-treatment system for purifying an exhaust gas of an internal combustion engine, includes the particle filter having the catalytic oxidation function and the at least one mixing chamber which are combined to form a constructive unit, wherein (i) the particle filter, the device having the catalytic oxidation function or (ii) the particle filter having the catalytic oxidation function and the at least one mixing chamber, are combined with one another to form the constructive unit, which is situated in a cylindrical container or forms such a container.   
     
     
         26 . The method of  claim 25 , wherein the exhaust gas/reducing agent mixture is further prepared in a catalytic converter device situated downstream from the at least one mixing chamber, and wherein the catalytic converter device produces a second treated exhaust gas. 
     
     
         27 . The method of  claim 25 , wherein the method is controlled by at least one control unit as a function of a selection of ascertained and evaluated parameters of the exhaust gas post-treatment system, the parameters including at least one of a particle mass, a particle number, an exhaust gas pressure, a temperature, an exhaust gas flow quantity, a reducing agent quantity, an exhaust gas composition, an exhaust gas concentration, a reducing potential, and an oxidation potential. 
     
     
         28 . The method of  claim 27 , wherein the at least one control unit enables, by modifications of parameters of the internal combustion engine and/or modifications of the parameters of the exhaust gas post-treatment system, a timely adaptation efficiently purify the exhaust gas. 
     
     
         29 . The exhaust gas post-treatment system of  claim 23 , wherein the efficiency is greater than 90%. 
     
     
         30 . The exhaust gas post-treatment system of  claim 23 , wherein the efficiency is greater than 95%. 
     
     
         31 . The exhaust gas post-treatment system of  claim 23 , wherein the efficiency is greater than 99%.