Method for operating a catalytic evaporator and uses of the method

Patent metadata

Field	Value
Publication number	US-11686275-B2
Application number	US-201816766802-A
Country	US
Kind code	B2
Filing date	Nov 22, 2018
Priority date	Nov 24, 2017
Publication date	Jun 27, 2023
Grant date	Jun 27, 2023

Abstract

A method is described for operating a catalytic evaporator ( 1 ), with the step: feeding fuel and an oxidant to the catalytic evaporator, which method is distinguished by the fact that (a) the feed of the fuel is performed as a pulsed feed, and/or (b) the feed of the oxidant is performed as a pulsed feed.

First claim

The invention claimed is:

1. A method for operating a catalytic evaporator ( 1 ) comprising the step of:
supplying fuel and an oxidant to the catalytic evaporator ( 1 ),
wherein
(a) the fuel is supplied as a pulsating addition and,
(b) the oxidant is supplied as a pulsating addition including a first amount of the oxidant added during a first time period or a second amount of the oxidant added during a second time period or no oxidant added during a third time period.

2. The method of claim 1 , wherein in the pulsating addition of the fuel a first amount of the fuel is added during a first time period or a second amount of the fuel is added during a second time period or no fuel is added during a third time period.

3. The method of claim 2 , wherein
(i) the first amount of fuel is added during the first time period and no fuel is added during the third time period,
or
(ii) the first amount of fuel is added during the first time period, the second amount of fuel is added during the second time period and no fuel is added during the third time period,
or
(iii) the first amount of fuel is added during the first time period and the second amount of fuel is added during the second time period.

4. The method of claim 2 , wherein the first time period is 10 ms to 10 s or the second time period is 10 ms to 10 s or the third time period is 10 ms to 10 s.

5. The method of claim 1 , wherein
(i) the first amount of oxidant is added during the first time period and no oxidant is added during the third time period,
or
(ii) the first amount of oxidant is added during the first time period, the second amount of oxidant is added during the second time period and no oxidant is added during the third time period,
or
(iii) the first amount of oxidant is added during the first time period and the second amount of oxidant is added during the second time period.

6. The method of claim 1 , wherein the first time period is 10 ms to 10 s or the second time period is 10 ms to 10 s or the third time period is 10 ms to 10 s.

7. The method of claim 1 , wherein the fuel is selected from gasoline, diesel, bio-oils, pyrolysis oils, biodiesel, heavy fuel oil, alcohols, Fischer-Tropsch fuels, dimethyl ether, diethyl ethers oxymethylene ether, esters, aldehydes, aromatic compounds, amines, carboxylic acids, alkanes, natural gas, camping gas, LPG, flare gases, landfill gases, bio-gases and mixtures of at least two of these fuels.

8. The method of claim 1 , wherein the oxidant contains oxygen or oxygen-containing media, in particular air or exhaust gases with residual oxygen.

9. The method of claim 1 , wherein said method shifts properties of said fuel in such a way that emissions are reduced within the engine.

10. The method of claim 1 , wherein said method reduces the light-off temperature in exhaust gas after-treatment systems of internal combustion engines.

11. The method of claim 1 , wherein said method generates a reducing agent for storage catalysts.

12. The method of claim 1 , wherein the first time period is 1 s to 5 s or the second time period is 1 s to 5 s or the third time period is 1 s to 5 s.

Assignees

• Fraunhofer Ges Forschung
• Fraunhofer Ges Forschung

Inventors

• Szolak Robert
• Susdorf Alexander
• Rümmele Florian

Classifications

• F02M31/18 Primary

  to vaporise fuel · CPC title

• F02M21/0287 Primary

  characterised by the transition from liquid to gaseous phase (F02M21/06 takes precedence); Injection in liquid phase; Cooling and low temperature storage · CPC title

• F01N3/05

  by means of air, e.g. by mixing exhaust with air (silencers working by addition of air to exhaust F01N1/14; arrangements for the supply of additional air for the thermal or catalytic conversion of noxious components of exhaust F01N3/30) · CPC title

• F02M21/06

  Apparatus for de-liquefying, e.g. by heating · CPC title

• F01N3/2033

  using a fuel burner or introducing fuel into exhaust duct · CPC title