Multi-compartment phae separation tank for multiple reductant injectors

Abstract

A cooling system in an aftertreatment unit for a multi-cylinder internal combustion engine is disclosed. The aftertreatment unit includes a selective catalyst reduction (SCR) module, an exhaust conduit portion, and a number of reductant injectors. Each reductant injector includes an injector coolant outlet. The cooling system supplies coolant to the reductant injectors by a coolant pump. A phase separation tank, positioned at a higher gravitational potential downstream of the reductant injectors, includes a number of compartments. Each compartment includes at least one inlet portion and at least one outlet portion. Each inlet portion is in fluid communication to the injector coolant outlet and each outlet portion is in fluid communication with the coolant reservoir. A coolant anti-siphon line portion facilitates fluid communication between the reductant injectors and the phase separation tank. Additionally, a coolant vent line facilitates fluid communication between the phase separation tank and the coolant reservoir.

What is claimed is: 
     
         1 . A cooling system in an aftertreatment unit for a multi-cylinder internal combustion engine, the aftertreatment unit including a selective catalyst reduction (SCR) module, an exhaust conduit portion connected upstream to the SCR module, and a plurality of reductant injectors in proximity to the exhaust conduit portion, wherein the plurality of reductant injectors is configured to inject a reductant fluid into the exhaust conduit portion, each reductant injector having an injector coolant outlet, the cooling system comprising:
 a coolant circuit having:
 a coolant reservoir; 
 at least one coolant pump to circulate a coolant through the coolant circuit and facilitate a coolant flow from the coolant reservoir to the plurality of reductant injectors, and back to the coolant reservoir; 
 a phase separation tank, positioned downstream of the plurality of reductant injectors, at a higher gravitational potential in relation to the plurality of reductant injectors, the phase separation tank including:
 a plurality of compartments, each compartment having at least one inlet portion and at least one outlet portion, wherein each inlet portion being in fluid communication to at least one of the injector coolant outlet and each outlet portion being in fluid communication with the coolant reservoir; 
 
 a coolant anti-siphon line portion, facilitating the fluid communication between the plurality of reductant injectors and the phase separation tank; and 
 a coolant vent line, facilitating the fluid communication between the phase separation tank and the coolant reservoir.