Engine arrangement comprising a heat recovery circuit and an exhaust gases after-treatment system

Abstract

An engine arrangement includes an internal combustion engine and an exhaust line capable of collecting exhaust gases from the engine, an exhaust gases after-treatment system including an injection device designed to inject an exhaust treatment fluid inside the exhaust line for at least partially removing undesired components from the exhaust gases a heat recovery circuit carrying a fluid in a loop, successively through at least a pump, an evaporator, and an expander capable of generating power from the fluid expansion. The exhaust treatment fluid is the fluid carried by the heat recovery circuit, or derived therefrom, and a connecting line is branched from the heat recovery circuit and designed to supply the injection device with the exhaust treatment fluid.

1 . An engine arrangement comprising:
 an internal combustion engine and an exhaust line capable of collecting exhaust gases from the engine;   an exhaust gases after-treatment system comprising an injection device designed to inject an exhaust treatment fluid inside the exhaust line for at least partially removing undesired con POT ms from the exhaust gases   a heat recovery circuit carrying a fluid in a loop, successively through at least a pump, an evaporator, and an expander capable of generating power from the fluid expansion;   wherein the exhaust treatment fluid is the fluid carried by the heat recover circuit, or derived therefrom, and in that a connecting line is branched from the heat recovery circuit and designed to supply the injection device with the exhaust treatment fluid.   
     
     
         2 . The engine arrangement according to  claim 1 , wherein the connecting line branches from the heat recovery circuit downstream from the evaporator and upstream from the expander. 
     
     
         3 . The engine arrangement according to  claim 1 , wherein the exhaust treatment fluid comprises ammonia. 
     
     
         4 . The engine arrangement according to  claim 1 , wherein the reducing fluid comprises ethanol. 
     
     
         5 . The engine arrangement according to  claim 1 , wherein it further comprises a fluid tank connected to the heat recovery circuit by a supply line. 
     
     
         6 . The engine arrangement according to  claim 5 , wherein it comprises a return line carrying the fluid from the heat recovery circuit to the fluid tank, the return line preferably branching from the heat recovery circuit downstream from the pump and upstream from the evaporator, and in that the fluid tank is devoid of heating means. 
     
     
         7 . The engine arrangement according to  claim 1 , when depending on  claim 3 , wherein the exhaust gases after-treatment system comprises a catalytic device located downstream from an injection inlet of the injection device by which the exhaust treatment fluid in injected in the exhaust line, wherein the undesired components are at least partially removed. 
     
     
         8 . The engine arrangement according to  claim 1 , wherein the fluid carried in the heat recovery circuit is evaporated in the evaporator by hot exhaust gases flowing in the exhaust line, by a coolant of the engine flowing in a coolant circuit downstream from the engine; by engine oil; b compressed intake air of the engine; and/or by EGR (exhaust gas recirculation) gases. 
     
     
         9 . The engine arrangement according to  claim 1 , when depending on  claim 5 , wherein it further comprises a control unit capable of controlling the pump operation in order to maintain an appropriate quantity of fluid. in the heat recovery circuit. 
     
     
         10 . The engine arrangement according to  claim 1 , wherein the heat recovery circuit further comprises a condenser downstream of the expander and upstream of the pump. 
     
     
         11 . A vehicle comprising an engine arrangement according to  claim 1 .