Ammonia combustion and methods relating thereto

Patent metadata

Field	Value
Publication number	US-11655427-B2
Application number	US-202117521924-A
Country	US
Kind code	B2
Filing date	Nov 9, 2021
Priority date	Nov 17, 2020
Publication date	May 23, 2023
Grant date	May 23, 2023

Abstract

Described are methods for shortening the combustion delay of ammonia fuels and reducing the amount of NO formed during the combustion process. The methods include mixing ammonia with hydrogen peroxide and water to form a fuel mixture and then combusting the fuel mixture. Methods of powering an internal combustion engine with ammonia fuels are also described.

First claim

What is claimed is:

1. A method for combusting ammonia, the method consisting of:
directing ammonia, hydrogen peroxide, and water into a chamber to create a fuel mixture, wherein the amount of ammonia in the fuel mixture is 48-97% molar, and wherein the amount of hydrogen peroxide in the fuel mixture is 2% molar and wherein the amount of water in the fuel mixture is up to 50% molar, and combusting the fuel mixture with an oxidant.

2. The method of claim 1 , wherein the amount of water in the fuel mixture is up to 30% molar.

3. The method of claim 2 , wherein the amount of water in the fuel mixture is between 5% molar and 15% molar.

4. The method of claim 3 , wherein the amount of water in the fuel mixture is 10% molar.

5. The method of claim 1 , wherein the ammonia, the hydrogen peroxide, and the water are all directed into the chamber separately.

6. The method of claim 1 , wherein the oxidant is air.

7. The method of claim 1 , wherein the oxidant is oxygen.

8. A method for powering an internal combustion engine, the method consisting of:
directing ammonia, hydrogen peroxide, and water into a combustion chamber of the internal combustion engine to create a compressed fuel mixture, wherein the combustion chamber is defined by a cylinder and a piston and wherein the amount of ammonia in the fuel mixture is 48-97% molar, the amount of hydrogen peroxide in the fuel mixture is 2% molar and wherein the amount of water in the fuel mixture is up to 50% molar, and
combusting the compressed fuel mixture to increase a pressure in the combustion chamber and generate a force acting against the piston.

9. The method of claim 8 , wherein the piston compresses the ammonia, hydrogen peroxide, and water in the cylinder to form the compressed fuel mixture.

10. The method of claim 9 , wherein the piston generates a compression ratio of between 12 and 20 in the cylinder.

11. The method of claim 8 , further including directing air into the combustion chamber prior to combusting the compressed fuel mixture.

12. The method of claim 8 , wherein the internal combustion engine is a spark-ignition engine.

13. The method of claim 8 , wherein the internal combustion engine is a compression-ignition engine.

Assignees

• Univ Khalifa Science & Technology

Inventors

• Kyritsis Dimitrios
• Goussis Dimitrios

Classifications

• F02M25/03 Primary

  into the cylinder {or the pre-combustion chamber} · CPC title

• F02B47/02

  the substances being water or steam · CPC title

• C10L1/125

  water · CPC title

• C10L1/1266 Primary

  nitrogen containing compounds, (e.g. NH3) · CPC title

• C10L2200/0254

  Oxygen containing compounds · CPC title