Fouling and corrosion detector for burner tips in fired equipment

• US 8,469,700 B2
• Filed: 09/29/2005
• Issued: 06/25/2013
• Est. Priority Date: 09/29/2005
• Status: Active Grant

• Current Assignee: Rosemount Incorporated (Emerson Electric Company)
• Original Assignee: Rosemount Incorporated (Emerson Electric Company)
• Inventors: Peluso, Marcos, Eliason, Scott, Brown, Gregory C.
• Primary Examiner(s): McAllister, Steven B
• Assistant Examiner(s): MASHRUWALA, NIKHIL P
• Application Number:
  US11/238,658
• Publication Number:
  US 20070072137A1
• Time in Patent Office: 2,826 Days
• Field of Search: 431/183, 431/187, 431/188, 431/353, 731/173, 73/190.5, 731/99.A
• US Class Current: 431/13
• CPC Class Codes: G01N 17/00 Investigating resistance of materials to the weather, to corrosion, or to light
• CPC Class Codes: G01N 17/008 Monitoring fouling
• CPC Class Codes: G01N 2291/02872 Pressure
• CPC Class Codes: G01N 2291/044 Internal reflections (echoes), e.g. on walls or defects
• CPC Class Codes: G01N 2291/2634 cylindrical from outside
• CPC Class Codes: G01N 29/11 by measuring attenuation of acoustic waves
• CPC Class Codes: G01N 29/12 by measuring frequency or resonance of acoustic waves measuring frequency or resonant frequency of mechanical vibrations or acoustic waves in general G01H1/06, G01H3/04, G01H13/00; acoustic resonators G10K11/04; vibration or shock testing of structures G01M7/00
• CPC Class Codes: G01N 29/4427 with stored values, e.g. threshold values
• CPC Class Codes: G01N 29/4481 Neural networks

Abstract

A system for predicting fouling and corrosion of a combustion system in an industrial process includes a pipe, a restrictive element, and a fouling and corrosion detector. The pipe contains a fuel. The restrictive element is coupled to the pipe and the fuel passes through the restrictive element. The fouling and corrosion detector is coupled to the pipe and is adapted to detect a characteristic signature of the restrictive element and to generate an alarm if a change in the detected signature exceeds a predetermined limit relative to a baseline signature.

Claims

1. A system for predicting fouling and corrosion of a combustion system in an industrial process comprising:

a pipe in the industrial process containing a fuel;

a restrictive element coupled to the pipe and which leads to a combustion chamber of the combustion system which generates a back pressure in the pipe; and

a fouling and corrosion detector coupled to the pipe and adapted to detect a characteristic signature having a time varying component of the fuel flowing through the restrictive element and into the combustion chamber of the combustion system, the characteristic signature reflected from the restrictive element;

wherein the characteristic signature comprises a reflected acoustic signal; and

wherein the fouling and corrosion detector comprises;

an acoustic transducer coupled to the pipe and adapted to detect acoustic signals in the fuel in the pipe;

a memory configured to store baseline characteristic acoustic signatures, and wherein the fouling and corrosion detector is configured to store a plurality of baseline characteristic acoustic signatures during normal operation of the restrictive element, the plurality of baseline characteristic acoustic signatures measured at different back pressures in the pipe; and

fouling and corrosion detection circuitry coupled to the acoustic transducer and to the memory and adapted to compare the characteristic signature detected by the acoustic transducer of a current back pressure against one of the stored plurality of baseline characteristic acoustic signatures obtained at a back pressure and responsively identify fouling or corrosion of the restrictive element based upon the comparison.

2. The system of claim 1 wherein the restrictive element comprises a burner tip within a heat delivery system of the industrial process.

3. The system of claim 1 wherein the fouling and corrosion detector is adapted to detect changes in background noise indicative of problems within the industrial process independent of fouling or corrosion.

4. The system of claim 1 wherein the fouling and corrosion detector comprises:

intelligent systems adapted to analyze the characteristic signature.

5. The system of claim 1 wherein detector is adapted to detect the characteristic signature using wavelet technology.

6. The system of claim 1 further comprising:

a local operator interface adapted to allow a user to set a baseline characteristic acoustic signature.

7. A system for monitoring fouling and corrosion of fired equipment within an industrial process, the system comprising:

a pipe in the industrial process containing a fuel;

a burner tip in a combustion chamber of the fired equipment and coupled to the pipe and adapted to deliver the fuel to the combustion chamber of the fired equipment, the burner tip defining a flow restriction at one end of the pipe and creating a back pressure in the pipe;

a transducer coupled to the pipe and adapted to detect an acoustic signature having a time varying component which is reflected from the burner tip;

wherein the acoustic signature comprises a detectable acoustic signal caused by the fuel flowing through the burner tip; and

circuitry adapted to store a plurality of baseline characteristic acoustic signatures during normal operation of the burner tip, the plurality of baseline characteristic acoustic signatures measured at different back pressures in the pipe and process the detected acoustic signature at a current back pressure against one of the plurality of stored baseline characteristic acoustic signatures obtained at a back pressure and to generate an alarm signal if the detected acoustic signature varies sufficiently from the one of the stored plurality of baseline characteristic acoustic signatures;

the acoustic transducer adapted to direct an acoustic signal toward the burner tip.

8. The system of claim 7 wherein the reflection varies as the burner tip becomes fouled or corroded.

9. The system of claim 7 and further comprising:

intelligent systems coupled to the circuitry and adapted to analyze the detected acoustic signature to predict fouling and/or corrosion of the burner tip.