Exhaust catalyst pre-heating system and method

• US 8,632,741 B2
• Filed: 12/30/2010
• Issued: 01/21/2014
• Est. Priority Date: 01/07/2010
• Status: Active Grant

• Current Assignee: Siemens Energy Incorporated (Siemens AG)
• Original Assignee: Dresser-Rand Group Incorporated (Siemens AG)
• Inventors: Tice, Jon K., Novacek, Loran
• Primary Examiner(s): VANOY, TIMOTHY C
• Application Number:
  US13/378,084
• Publication Number:
  US 20130047586A1
• Time in Patent Office: 1,118 Days
• Field of Search: 423/210, 423/245.3, 423/246, 423/247, 423/213.2, 602/99, 603/17, 431/2, 431/5, 110/210, 110/345, 422/105, 700/266, 700/274
• US Class Current: 423/210
• CPC Class Codes: F01N 2240/14 a fuel burner
• CPC Class Codes: F01N 2470/30 Tubes with restrictions, i.e. venturi or the like, e.g. for sucking air or measuring mass flow
• CPC Class Codes: F01N 2590/10 for stationary applications
• CPC Class Codes: F01N 2610/03 the substance being hydrocarbons, e.g. engine fuel
• CPC Class Codes: F01N 2610/08 with prior mixing of the substances with a gas, e.g. air
• CPC Class Codes: F01N 3/2033 using a fuel burner or introducing fuel into exhaust duct
• CPC Class Codes: F01N 3/30 Arrangements for supply of additional air control, e.g. using by-passes or variable air pump drives, F01N3/22
• CPC Class Codes: F01N 3/306 Preheating additional air
• CPC Class Codes: F01N 3/36 Arrangements for supply of additional fuel
• CPC Class Codes: F01N 9/00 Electrical control of exhaust gas treating apparatus monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N11/00; conjoint electrical control of two or more combustion engine functions F02D43/00
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A system and method according to which exhaust is directed from a stationary exhaust source and through a burner, and a combustible fluid is vented from at least one combustible fluid source other than the stationary exhaust source. The combustible fluid is captured and directed to flow from the combustible fluid source and towards the burner, and at least air is mixed with the captured combustible fluid to form a mixture. The mixture is introduced into the burner and burned therein to thereby pre-heat the exhaust flowing therethrough. The pre-heated exhaust contacts a catalyst.

Claims

1. A method of processing exhaust, comprising:

introducing the exhaust from a stationary exhaust source to a burner;

capturing a combustible fluid from a combustible fluid source other than the stationary exhaust source;

mixing air with the captured combustible fluid to form a mixture;

burning the mixture in the burner to pre-heat the exhaust flowing therethrough; and

contacting the pre-heated exhaust with a catalyst.

2. The method of claim 1, wherein the captured combustible fluid comprises one or more combustible or volatile organic compounds.

3. The method of claim 1, further comprising:

determining an amount of reduction of greenhouse gas emissions to atmosphere; and

outputting the amount of the reduction of greenhouse gas emissions to atmosphere.

4. The method of claim 3, wherein determining the amount of the reduction of greenhouse gas emissions to atmosphere comprises:

determining a composition of the captured combustible fluid;

determining a greenhouse gas equivalent of the composition of the captured combustible fluid; and

measuring a rate of flow of the captured combustible fluid toward the burner before mixing air therewith.

5. The method of claim 4, wherein determining the amount of the reduction of greenhouse gas emissions to atmosphere further comprises:

executing a plurality of instructions with a processor, the plurality of instructions being stored in a computer readable medium that is operably coupled to the processor, wherein, in response to the execution of the plurality of instructions;

the rate of the flow of the captured combustible fluid is automatically measured;

an amount of the reduction of greenhouse gas emissions to atmosphere is automatically determined using at least the determined composition of the captured combustible fluid, the determined greenhouse gas equivalent of the captured combustible fluid, and the automatically measured rate of the flow of the captured combustible fluid; and

the amount of the reduction of greenhouse gas emissions to atmosphere is automatically reported.

6. The method of claim 1, further comprising mixing supplemental fuel with the air and the captured combustible fluid.

7. The method of claim 6, further comprising controlling a flow of the supplemental fuel into the flow of the captured combustible fluid.

8. The method of claim 1, further comprising:

providing pilot fuel to the burner.

9. The method of claim 1, wherein burning the mixture in the burner comprises:

igniting the mixture; and

controlling the ignition of the mixture.

10. A system for processing exhaust, comprising:

a stationary exhaust source;

an exhaust stack in fluid communication with the stationary exhaust source;

a catalyst in fluid communication with the stationary exhaust source through the exhaust stack;

a burner in fluid communication with the exhaust stack between the stationary exhaust source and the catalyst, the burner being in fluid communication with each of the stationary exhaust source and the catalyst;

a fuel mixer in fluid communication with the burner;

an air source in fluid communication with the fuel mixer; and

a source of combustible fluid other than the exhaust source, in fluid communication with the fuel mixer.

11. The system of claim 10, wherein the combustible fluid comprises one or more combustible or volatile organic compounds.

12. The system of claim 10, further comprising a gas or vapor regulator in fluid communication with each of the fuel mixer and the source of combustible fluid, the gas or vapor regulator being positioned between the fuel mixer and the source of combustible fluid.

13. The system of claim 12, further comprising a flow meter in fluid communication with each of the gas or vapor regulator and the fuel mixer, the flow meter being positioned between the gas or vapor regulator and the fuel mixer.

14. The system of claim 10, further comprising a supplemental fuel regulator in fluid communication with the fuel mixer.

15. The system of claim 10, further comprising a control apparatus, comprising:

a processor; and

a computer readable medium coupled to the processor and having a plurality of instructions stored therein that are executable by the processor, the plurality of instructions being operable to control a flow of the combustible fluid from the source of combustible fluid to the fuel mixer, control a flow of air from the air source to the fuel mixer, and control ignition of the mixture by the burner.

16. An apparatus for controlling pre-heating of exhaust from a stationary exhaust source before the exhaust flows through a catalyst, the apparatus comprising:

a computer readable medium having a plurality of instructions stored therein, the plurality of instructions being executable by a processor, the plurality of instructions comprising;

instructions that control a flow of captured combustible fluid that is vented and captured from at least one combustible fluid source other than the stationary exhaust source, the captured combustible fluid flowing from the at least one combustible fluid source to a burner through which the exhaust flows before the exhaust flows through the catalyst;

instructions that control a flow of air into the flow of the captured combustible fluid; and

instructions that control ignition of a mixture in the burner, the mixture comprising the captured combustible fluid and the air, the ignition of the mixture in the burner causing the mixture to burn and thus pre-heat the exhaust that flows through the burner before the exhaust flows through the catalyst.

17. The apparatus of claim 16, wherein the plurality of instructions further comprises instructions that control a flow of supplemental fuel into the flow of the captured combustible fluid, wherein the mixture further comprises the supplemental fuel.

18. The apparatus of claim 16, wherein the captured combustible fluid comprises one or more greenhouse gases and burning the mixture reduces greenhouse gas emissions to atmosphere, wherein the plurality of instructions further comprises:

instructions that automatically determine an amount of the reduction of greenhouse gas emissions to atmosphere; and

instructions that automatically report the amount of the reduction of greenhouse gas emissions to atmosphere.

19. The apparatus of claim 18, wherein the instructions that automatically determine the amount of the reduction of greenhouse gas emissions to atmosphere comprise instructions that automatically measure a rate of the flow of the captured combustible fluid towards the burner before the air flows into the flow of the captured combustible fluid.

20. The apparatus of claim 19, wherein the amount of the reduction of greenhouse gas emissions to atmosphere is automatically determined using at least a determined composition of the captured combustible fluid, a determined greenhouse gas equivalent of the captured combustible fluid, and the automatically measured rate of the flow of the captured combustible fluid.