Exhaust Aftertreatment System With Ammonia Gas Generator

Patent metadata

Field	Value
Publication number	US-2017122169-A1
Application number	US-201514931039-A
Country	US
Kind code	A1
Filing date	Nov 3, 2015
Priority date	Nov 3, 2015
Publication date	May 4, 2017
Grant date	—

Abstract

An exhaust aftertreatment system may include a reductant tank, a reactor system, a storage tank, a first conduit and a second conduit. The reactor system may receive reductant from the reductant tank and may output a gas comprising ammonia. The storage tank may receive gas comprising ammonia from the reactor system and may store a volume of gas comprising ammonia. The first conduit may communicate gas comprising ammonia from the reactor system to a stream of exhaust gas. The first conduit may bypass the storage tank. The second conduit may communicate gas comprising ammonia from the storage tank to the stream of exhaust gas.

First claim

1 . (canceled)

2 . (canceled)

3 . (canceled)

4 . An exhaust aftertreatment system comprising:
a reductant tank; a reactor system receiving reductant from the reductant tank and outputting gas comprising ammonia; a storage tank receiving gas comprising ammonia from the reactor system and storing a volume of gas comprising ammonia; a first conduit communicating gas comprising ammonia from the reactor system to a stream of exhaust gas, the first conduit bypassing the storage tank; a second conduit communicating gas comprising ammonia from the storage tank to the stream of exhaust gas; and a third conduit communicating gas comprising ammonia from the reactor system to the storage tank, wherein the first and second conduits are fluidly coupled with an exhaust pipe at a location upstream of a catalyst in the stream of exhaust gas, wherein the catalyst is a selective catalytic reduction catalyst, further comprising a particulate filter and an oxidation catalyst, the particulate filter disposed upstream of the location, the oxidation catalyst disposed upstream of the particulate filter.

5 . An exhaust aftertreatment system comprising:
a reductant tank; a reactor system receiving reductant from the reductant tank and outputting gas comprising ammonia; a storage tank receiving gas comprising ammonia from the reactor system and storing a volume of gas comprising ammonia; a first conduit communicating gas comprising ammonia from the reactor system to a stream of exhaust gas, the first conduit bypassing the storage tank; a second conduit communicating gas comprising ammonia from the storage tank to the stream of exhaust gas; and a third conduit communicating gas comprising ammonia from the reactor system to the storage tank, further comprising a first heat exchanger in a heat transfer relationship with the reactor system, the first heat exchanger transferring heat from exhaust gas to the reactor system.

6 . The exhaust aftertreatment system of claim 5 , further comprising an exhaust supply passageway fluidly coupling the stream of exhaust gas and the first heat exchanger so that exhaust gas from the stream of exhaust gas can flow through the first heat exchanger.

7 . The exhaust aftertreatment system of claim 6 , wherein the exhaust supply passageway includes a valve controlling fluid flow therethrough.

8 . The exhaust aftertreatment system of claim 7 , further comprising an exhaust return passageway fluidly coupling the stream of exhaust gas and the first heat exchanger, wherein the exhaust supply and return passageways are connected to the stream of exhaust gas upstream of a catalyst in the stream of exhaust gas.

9 . The exhaust aftertreatment system of claim 8 , further comprising an electrical heating element in a heat transfer relationship with the reactor system.

10 . The exhaust aftertreatment system of claim 5 , further comprising a second heat exchanger in which heat is transferred from the stream of exhaust gas to a working fluid, wherein the first and second heat exchangers are fluidly coupled to each other to allow a first flow of the working fluid therebetween.

11 . The exhaust aftertreatment system of claim 10 , wherein the second heat exchanger is fluidly coupled to an engine to allow a second flow of the working fluid therebetween.

12 . The exhaust aftertreatment system of claim 11 , further comprising a valve controlling the first and second flows of the working fluid.

13 . The exhaust aftertreatment system of claim 12 , further comprising an electrical heating element in a heat transfer relationship with the reactor system.

14 . The exhaust aftertreatment system of claim 5 , further comprising a Rankine cycle fluid circuit transferring heat from exhaust gas to working fluid, wherein the first heat exchanger receives the working fluid and transfers heat from the working fluid to the reactor system.

15 . The exhaust aftertreatment system of claim 5 , further comprising:
a second heat exchanger in a heat transfer relationship with the reductant tank, the second heat exchanger transferring heat from exhaust gas to the reductant tank; and a valve controlling flows of a heat transfer medium through the first and second heat exchangers.

16 . An exhaust aftertreatment system comprising:
a reductant tank; a reactor system receiving reductant from the reductant tank and outputting gas comprising ammonia; a storage tank receiving gas comprising ammonia from the reactor system and storing a volume of gas comprising ammonia; a first conduit communicating gas comprising ammonia from the reactor system to a stream of exhaust gas, the first conduit bypassing the storage tank; a second conduit communicating gas comprising ammonia from the storage tank to the stream of exhaust gas; and a third conduit communicating gas comprising ammonia from the reactor system to the storage tank, further comprising a first heat exchanger in a heat transfer relationship with the reactor system, the first heat exchanger fluidly coupled with an engine to allow communication of a working fluid therebetween, the first heat exchanger transferring heat from the working fluid to the reactor system.

17 . An exhaust aftertreatment system comprising:
a reductant tank; a reactor system receiving reductant from the reductant tank and outputting gas comprising ammonia; a storage tank receiving gas comprising ammonia from the reactor system and storing a volume of gas comprising ammonia; a first conduit communicating gas comprising ammonia from the reactor system to a stream of exhaust gas, the first conduit bypassing the storage tank; a second conduit communicating gas comprising ammonia from the storage tank to the stream of exhaust gas; and a third conduit communicating gas comprising ammonia from the reactor system to the storage tank, wherein the reactor system includes an electrolysis reactor unit.

18 . The exhaust aftertreatment system of claim 17 , further comprising a heat exchanger in a heat transfer relationship with the electrolysis reactor unit and another heat exchanger in a heat transfer relationship with the water separator, the heat exchangers transferring heat from exhaust gas to the electrolysis reactor unit and water separator.

19 . The exhaust aftertreatment system of claim 17 , wherein the reactor system includes and a separation unit disposed downstream of the electrolysis reactor unit.

20 . An exhaust aftertreatment system comprising:
a reductant tank; a reactor system receiving reductant from the reductant tank and providing gas comprising ammonia to an exhaust gas pipe; a first heat exchanger in a heat transfer relationship with the reactor system, the first heat exchanger transferring heat from exhaust gas to the reactor system; a second heat exchanger in a heat transfer relationship with the reductant tank, the second heat exchanger transferring heat from exhaust gas to the reductant tank; and a valve controlling flows of a heat transfer medium through the first and second heat exchangers.

21 . The exhaust aftertreatment system of claim 20 , further comprising:
a storage tank receiving gas comprising ammonia from the reactor system and storing a volume of the gas; a first conduit communicating gas comprising ammonia from the reactor system to the exhaust pipe, the first conduit bypassing the storage tank; and a second conduit communicating gas comprising ammonia from the storage tank to the exhaust pipe, the first and second conduits fluidly coupl

Assignees

• Tenneco Automotive Operating Co Inc

Inventors

• Ettireddy Padmanabha R
• Fingland Bradley
• Kotrba Adam J
• Degeorge John W
• Bradford Michael C

Classifications

• F01N2240/25

  an ammonia generator · CPC title

• B01D53/9431 Primary

  Processes characterised by a specific device · CPC title

• F01N2250/02

  filtering and catalytic conversion · CPC title

• F01N2240/10

  a heat accumulator · CPC title

• F01N3/2013 Primary

  using electric or magnetic heating means · CPC title