Multi-engine system with on-board ammonia production

Abstract

A power system is provided having a first power source including at least one engine configured to combust a first air/fuel mixture and produce a first exhaust stream. The fuel of the first air/fuel mixture may be liquefied petroleum gas. The system also has a first exhaust passageway fluidly connected to the first power source and configured to receive the first exhaust stream. In addition, the system has a second power source including at least one engine configured to combust a second fuel/air mixture and produce a second exhaust stream. Furthermore, the system has a second exhaust passageway fluidly connected to the second power source and configured to receive the second exhaust stream. The system further has a first catalyst disposed within the first exhaust passageway to convert at least a portion of the first exhaust stream to ammonia

1 - 10 . (canceled) 
     
     
         11 . A locomotive, comprising:
 a first power source configured to power the locomotive, the first power source including at least one engine configured to combust a first air/fuel mixture;   a second power source configured to power the locomotive, the second power source including at least one engine configured to combust a second air/fuel mixture;   at least one generator drivingly coupled to at least one of the first power source or the second power source, wherein the at least one generator is configured to generate electrical energy to power the locomotive;   a first exhaust passageway fluidly connected to the first power source and configured to receive a first exhaust stream;   a second exhaust passageway fluidly connected to the second power source and configured to receive a second exhaust stream; and   a first catalyst disposed within the first exhaust passageway to convert at least a portion of the first exhaust stream to ammonia.   
     
     
         12 . The locomotive of  claim 11 , wherein the fuel of the first air/fuel mixture is diesel fuel, and the fuel of the second air/fuel mixture is liquefied petroleum gas. 
     
     
         13 . The locomotive of  claim 12 , wherein the second power source receives the liquefied petroleum gas from a tender car. 
     
     
         14 . The locomotive of  claim 11 , wherein the first and second exhaust passageways are fluidly connected downstream from the first catalyst to form a merged exhaust passageway configured to receive a combined exhaust stream. 
     
     
         15 . The locomotive of  claim 14  further including a second catalyst disposed within the merged exhaust passageway. 
     
     
         16 . The locomotive of  claim 15 , wherein the second catalyst is configured to facilitate a reaction between ammonia and NOx in the combined exhaust stream to at least partially remove NOx from the combined exhaust stream. 
     
     
         17 . The locomotive of  claim 16 , further including at least one sensor configured to sense a parameter indicative of an amount of NOx in the first and/or second exhaust passageways and at least one sensor configured to sense a parameter indicative of an amount of ammonia in the first exhaust passageway. 
     
     
         18 . The locomotive of  claim 11 , wherein the first air/fuel mixture is richer than stoichiometric condition and the second air/fuel mixture is leaner than stoichiometric condition. 
     
     
         19 - 20 . (canceled) 
     
     
         21 . A locomotive, comprising:
 a first power source configured to drive a first traction device to propel the locomotive, the first power source including at least one engine configured to combust a first air/fuel mixture;   a second power source configured to drive a second traction device to propel the locomotive, the second power source including at least one engine configured to combust a second air/fuel mixture;   a first exhaust passageway fluidly connected to the first power source and configured to receive a first exhaust stream;   a second exhaust passageway fluidly connected to the second power source and configured to receive a second exhaust stream; and   a first catalyst disposed within the first exhaust passageway to convert at least a portion of the first exhaust stream to ammonia.   
     
     
         22 . The locomotive of  claim 21 , wherein the first power source and the second power source are drivingly connected to at least one generator to generate electrical energy to propel the locomotive. 
     
     
         23 . The locomotive of  claim 21 , wherein the fuel of the first air/fuel mixture is diesel fuel, and the fuel of the second air/fuel mixture is liquefied petroleum gas. 
     
     
         24 . The locomotive of  claim 23 , wherein the locomotive is a locomotive and the second power source receives the liquefied petroleum gas from a tender car. 
     
     
         25 . The locomotive of  claim 21 , wherein the first and second exhaust passageways are fluidly connected downstream from the first catalyst to form a merged exhaust passageway configured to receive a combined exhaust stream. 
     
     
         26 . The locomotive of  claim 25 , further including a second catalyst disposed within the merged exhaust passageway configured to facilitate a reaction between ammonia and NOx in the combined exhaust stream to at least partially remove NOx from the combined exhaust stream. 
     
     
         27 . The locomotive of  claim 26 , further including a particulate filter located upstream of the second catalyst and downstream of a location where the first and second exhaust passageways merge. 
     
     
         28 . A locomotive, comprising:
 a first power source including at least one engine configured to combust a first air/fuel mixture;   a second power source including at least one engine configured to combust a second air/fuel mixture;   a first generator drivingly coupled to the first power source, wherein the first generator is configured to generate electrical energy to drive the locomotive;   a second generator drivingly coupled to the second power source, wherein the second generator is configured to generate electrical energy to drive the locomotive;   a first exhaust passageway fluidly connected to the first power source and configured to receive a first exhaust stream;   a second exhaust passageway fluidly connected to the second power source and configured to receive a second exhaust stream; and   a first catalyst disposed within the first exhaust passageway to convert at least a portion of the first exhaust stream to ammonia.   
     
     
         29 . The locomotive of  claim 28 , wherein the fuel of the first air/fuel mixture is diesel fuel, and the fuel of the second air/fuel mixture is liquefied petroleum gas. 
     
     
         30 . The locomotive of  claim 29 , wherein the second power source receives the liquefied petroleum gas from a tender car. 
     
     
         31 . The locomotive of  claim 28 , wherein the first and second exhaust passageways are fluidly connected downstream from the first catalyst to form a merged exhaust passageway configured to receive a combined exhaust stream. 
     
     
         32 . The locomotive of  claim 31 , further including:
 a second catalyst disposed within the merged exhaust passageway configured to facilitate a reaction between ammonia and NOx in the combined exhaust stream to at least partially remove NOx from the combined exhaust stream; and   a particulate filter located upstream of the second catalyst and downstream of a location where the first and second exhaust passageways merge.