Combined ignitor spark and flame rod

Patent metadata

Field	Value
Publication number	US-2016377286-A1
Application number	US-201514748655-A
Country	US
Kind code	A1
Filing date	Jun 24, 2015
Priority date	Jun 24, 2015
Publication date	Dec 29, 2016
Grant date	—

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 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 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 single ignitor and flame rod assembly is operative to generate a spark in the combustion chamber as well as to sense and/or monitor a flame in the combustion chamber.

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

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

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

6 . The ignition system of claim 1 , where the system comprises no other spark ignition rod or flame detection rod.

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

8 . 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 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.

9 . The method of claim 8 , where the single ignitor and flame rod assembly is operative to sense and/or monitor the flame.

Assignees

• Alstom Technology Ltd

Inventors

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

Classifications

• F23N2227/36

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

• F23N2229/12

  with flame rectification current detecting means · CPC title

• F23N2227/28

  Ignition circuits · CPC title

• F23N5/022 Primary

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

• F23D5/12

  Details · CPC title