Venturi induction for heat recovery and low nox internal combustion engines

Abstract

Internal combustion engine heat is recovered by charge air for useful work and to increase engine thermal efficiency. A dual liquid/air cooling system is presented to facilitate heat recovery. Water is injected into a pintle-regulated Venturi to mitigate the engine charge temperature, control the combustion temperature and reduce NOx emissions.

1 . A double-wall exhaust pipe carrying exhaust inside a center pipe heats charge air flowing through an annulus, whereby heated charge air as stated in  claim 5  is provided to a spark-ignition or compression ignition engine.  
   
   
       2 . A double-wall pipe conveys heated charge air in the center channel and an evacuated annulus minimizes heat loss, whereby heated charge air as stated in  claim 5  is provided to a spark ignition or compression ignition engine.  
   
   
       3 . A dual medium coolant system comprised of an inner chamber for liquid cooling and an outer chamber for air cooling; the liquid-cooled chamber controls the engine temperature with a flow control thermostat; charge air is conveyed through the outer chamber to the engine for combustion; whereby heated charge air as stated in  claim 5  is provided to a spark ignition or compression ignition engine.  
   
   
       4 . A dual coolant chamber comprised of an inner chamber for liquid cooling and an outer chamber for air cooling, with fins spanning from the inner liquid-cooled chamber to the outer vapor-cooled chamber to increase heat transfer to the outer air-cooled heat transfer chamber; the liquid-cooled chamber controls the engine temperature with a flow control thermostat; charge air is conveyed through the outer chamber to the engine for combustion: whereby heated charge air as stated in  claim 5  is provided to a spark ignition or compression ignition engine.  
   
   
       5 . Heated charge air and water is injected into a pintle-regulated Venturi; whereby the engine combustion temperature is controlled by the water injection rate in a spark ignition or compression ignition engine.