# US 9,752,481 B2 · Locomotive and transit system efficiency and emissions improvements

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- Number: US 9,752,481 B2
- Document ID: US9752481B2
- Status: Granted
- Kind: B2
- Application number: 14/816,331
- Filed: 2015-08-03
- Published: 2015-11-26
- Granted: 2017-09-05
- Earliest claimed: 2013-03-15
- Assignees: Clean Train Propulsion
- Applicants: David Cook
- Inventors: David Cook
- Web page: https://patentgrep.com/patent/US9752481B2

## CPC

- F01N 3/20: specially adapted for catalytic conversion (F01N3/22 takes precedence)
- B61C 3/02: with electric accumulators
- B61C 17/02: Bunkers; Tanks; Tenders (coachwork B61D); Water or fuel pick-up or scoop apparatus; Water or fuel supply fittings (trackside installations, e.g. bunkers, tanks, for filling locomotives with sand or water B61K11/00)
- B61D 15/06: Buffer cars; Arrangements or construction of railway vehicles for protecting them in case of collisions (buffers B61G11/00)
- F01N 3/103: {Oxidation catalysts for HC and CO only}
- F01N 3/2066: {Selective catalytic reduction [SCR]}
- F01N 13/0093: {the purifying devices are of the same type}
- F01N 13/085: {having means preventing foreign matter from entering exhaust conduit}
- F01N 13/10: of exhaust manifolds {(with cooling jacket F01N3/046)}
- F01N 13/1816: {the pipe sections being joined together by flexible tubular elements only, e.g. using bellows or strip-wound pipes}
- F01N 2340/02: Distance of the exhaust apparatus to the engine or between two exhaust apparatuses
- F01N 2340/06: Arrangement of the exhaust apparatus relative to the turbine of a turbocharger
- F01N 2610/02: the substance being ammonia or urea
- Y02T 10/12: Improving ICE efficiencies
- Y02T 30/00: Transportation of goods or passengers via railways, e.g. energy recovery or reducing air resistance
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)
- B61C: LOCOMOTIVES; MOTOR RAILCARS (vehicles in general B60; frames or bogies B61F; special railroad equipment for locomotives B61J, B61K)
- B61D: BODY DETAILS OR KINDS OF RAILWAY VEHICLES (vehicles in general B60; adaptation of vehicles to special systems B61B; underframes B61F)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A system includes a prime engine connected to a prime engine exhaust stack that receives prime engine exhaust, a mixing duct section connected to the prime engine exhaust stack, a head-end power (HEP) generator connected to an HEP generator exhaust pipe that receives HEP generator exhaust, a single urea injector, and a selective catalytic reduction (SCR) system. The HEP generator exhaust pipe is connected to the mixing duct section, and the single urea injector injects urea into the HEP generator exhaust pipe upstream of the mixing duct section. The HEP generator exhaust and prime engine exhaust merge in the mixing duct section to form a merged exhaust that is received by the SCR system.

## Claims

### Claim 1

A system for processing generator and engine exhaust comprising:
a prime engine connected to a prime engine exhaust stack that receives prime engine exhaust;
a mixing duct section connected to the prime engine exhaust stack;
a generator connected to generator exhaust pipe that receives generator exhaust, wherein the generator exhaust pipe is connected to the mixing duct section;
a single urea injector that injects urea into the generator exhaust pipe upstream of the mixing duct section; and
a selective catalytic reduction (SCR) unit;
wherein the generator exhaust and prime engine exhaust merge in the mixing duct section to form a merged exhaust;
wherein the SCR unit receives the merged exhaust; and
wherein the single urea injector is upstream of the mixing duct section at a distance of more than three effective diameters of the generator exhaust pipe.

### Claim 2 (depends on 1)

The system of claim 1, wherein the generator exhaust is injected to the mixing duct section such that a flow direction of the generator exhaust is normal to a flow direction of the prime engine exhaust.

### Claim 3 (depends on 1)

The system of claim 1, wherein the generator exhaust pipe includes a cylindrical nozzle within the mixing duct section.

### Claim 4 (depends on 1)

The system of claim 1, wherein the mixing duct section includes a plurality of holes, and wherein the generator exhaust pipe injects the generator exhaust into the plurality of holes of the mixing duct section.

### Claim 5 (depends on 1)

The system of claim 1, wherein the SCR system has an SCR system efficiency of at least 95%.

### Claim 6 (depends on 1)

The system of claim 1, wherein the generator is a head-end power generator.

### Claim 7 (depends on 1)

The system of claim 1, wherein the generator is a diesel generator.

### Claim 8

A system for processing generator and engine exhaust comprising:
a prime engine connected to a prime engine exhaust stack that receives prime engine exhaust;
a mixing duct section connected to the prime engine exhaust stack;
a generator connected to an generator exhaust pipe that receives generator exhaust, wherein the generator exhaust pipe is connected to the mixing duct section;
a single urea injector that injects urea into the generator exhaust pipe upstream of the mixing duct section;
a particulate filter installed in the generator exhaust pipe upstream of the single urea injector; and
a selective catalytic reduction (SCR) unit;
wherein the generator exhaust and prime engine exhaust merge in the mixing duct section to form a merged exhaust;
wherein the SCR unit receives the merged exhaust; and
wherein the single urea injector is upstream of the mixing duct section at a distance of more than three effective diameters of the generator exhaust pipe.

### Claim 9 (depends on 8)

The system of claim 8, wherein the generator is a head-end power generator.

### Claim 10 (depends on 8)

The system of claim 8, wherein the generator is a diesel generator.

### Claim 11

A method of processing exhaust comprising:
providing a prime engine connected to a prime engine exhaust stack that receives prime engine exhaust;
providing a generator connected to an generator exhaust pipe that receives generator exhaust, wherein the generator exhaust pipe is connected to the prime engine exhaust stack;
providing a single urea injector that injects urea into the generator exhaust pipe;
merging the HEP generator exhaust and the prime engine exhaust;
providing a selective catalytic reduction (SCR) system that receives the merged exhaust; and
wherein the single urea injector is upstream of the mixing duct section at a distance of more than three effective diameters of the generator exhaust pipe.

### Claim 12 (depends on 11)

The method of claim 11, further including the step of providing a particulate filter installed in the generator exhaust pipe upstream of the single urea injector.

### Claim 13 (depends on 11)

The method of claim 11, wherein the generator is a head-end power generator.

### Claim 14 (depends on 11)

The method of claim 11, wherein the generator is a diesel generator.