Combined ignitor spark and flame rod

Patent metadata

Field	Value
Publication number	US-9863635-B2
Application number	US-201514748655-A
Country	US
Kind code	B2
Filing date	Jun 24, 2015
Priority date	Jun 24, 2015
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

Disclosed herein is an ignition system for igniting a flame in a combustion chamber comprising a conduit secured to a windbox wall of the combustion chamber; where the conduit includes a fuel conduit for delivering fuel to the combustion chamber; and a single ignitor and flame rod assembly having a first end and a second end; where the first end comprises a high energy ignitor tip; where the second end is in electrical communication with an electrical power source; where the electrical power source comprises a spark transformer that comprises a primary winding and a secondary winding; a flame monitoring ignitor; where the flame monitoring ignitor is in direct electrical communication with a ground contact and with a low voltage side of the secondary winding; where the flame monitoring ignitor is disposed between the low voltage side of the secondary winding and a ground contact; and a transient voltage suppressor; that is disposed in parallel with the flame monitoring ignitor.

First claim

What is claimed is:

1. An ignition system for igniting a flame in a combustion chamber comprising:
a conduit secured to a windbox wall of the combustion chamber; where the conduit includes:
a fuel conduit for delivering fuel to the combustion chamber; and
a single conductive rod operative to generate a spark in the combustion chamber and to sense a flame in the combustion chamber, having a first end and a second end; where the first end comprises a high energy ignitor tip; where the second end is in electrical communication with an electrical power source; where the electrical power source comprises;
a spark transformer that comprises a primary winding, and a secondary winding isolated from ground;
a flame monitoring ignitor; where the flame monitoring ignitor is, in electrical communication with a ground contact and with a low voltage side of the secondary winding; where the flame monitoring ignitor is disposed between the low voltage side of the secondary winding and the ground contact; and
a transient voltage suppressor; that is disposed in parallel with the flame monitoring ignitor.

2. The ignition system of claim 1 , where the flame monitoring ignitor is a diagnostic flame indicator that comprises at least one of an electrical spark source, a self-stabilizing burner device, and flame detection systems.

3. The ignition system of claim 1 , where the fuel conduit is collinear and disposed within the compressed air conduit.

4. The ignition system of claim 3 , further comprising a bluff body disposed at a terminus of the compressed air conduit and an atomizer disposed within a bluff body.

5. The ignition system of claim 1 , where the system comprises no additional rods operative to spark ignition or detect a flame detection.

6. The ignition system of claim 1 , where the high energy ignitor tip is a metal button welded to a conductive metal rod.

7. A method comprising:
discharging a mixture of compressed air and fuel into a combustion chamber from a fuel conduit, and
discharging a spark into the combustion chamber from an ignition system, where the ignition system comprises:
a single conductive rod having a first end and a second end; where the first end comprises a high energy ignitor tip; where the second end is in electrical communication with an electrical power source; where the electrical power source comprises:
a spark transformer that comprises a primary winding and a secondary winding; a flame monitoring ignitor; where the flame monitoring ignitor is in direct electrical communication with a ground contact and with a low voltage side of the secondary winding; where the flame monitoring ignitor is disposed between the low voltage side of the secondary winding and a ground contact; and
a transient voltage suppressor; that is disposed in parallel with the flame monitoring ignitor.

Assignees

• Alstom Technology Ltd
• General Electric Technology Gmbh

Inventors

• Boguszewski Stanley Joseph
• Tobiasz Rebecca Lynn
• Edberg Carl David

Classifications

• F23N2229/12

  with flame rectification current detecting means · CPC title

• F23N2227/36

  Spark ignition, e.g. by means of a high voltage · CPC title

• F23N2227/28

  Ignition circuits · CPC title

• F23N5/022 Primary

  using electronic means (F23N5/04 - F23N5/14 take precedence) · CPC title

• F23Q3/00 Primary

  Igniters using electrically-produced sparks (sparking-plugs H01T13/00) · CPC title