Integrated burner assembly

• US 5,685,707 A
• Filed: 01/16/1996
• Issued: 11/11/1997
• Est. Priority Date: 01/16/1996
• Status: Expired due to Fees

• Current Assignee: Fives North American Combustion, Inc. (Fives SA)
• Original Assignee: NORTH AMERICAN MANUFACTURING COMPANY INCORPORATED
• Inventors: Ramsdell, John L., Hrabak, Steven G.
• Primary Examiner(s): Dority, Carroll B.
• Application Number:
  US08/585,623
• Time in Patent Office: 665 Days
• Field of Search: 431/31, 431/63, 431/62, 431/90
• US Class Current: 431/90
• CPC Class Codes: F23D 14/36 in which the compressor and burner form a single unit
• CPC Class Codes: F23D 23/00 Assemblies of two or more burners gas burners with provision for a retention flame F23D14/26
• CPC Class Codes: F23N 1/022 using electronic means
• CPC Class Codes: F23N 2005/181 using detectors sensitive to rate of flow of air
• CPC Class Codes: F23N 2005/185 using detectors sensitive to rate of flow of fuel
• CPC Class Codes: F23N 2225/06 for determining flow
• CPC Class Codes: F23N 2233/08 with variable speed
• CPC Class Codes: F23N 2235/16 variable flow or proportional valves
• CPC Class Codes: F23N 2237/02 two or more burners
• CPC Class Codes: F23N 5/184 using electronic means

Abstract

An integrated burner system is disclosed having a fuel supply assembly including a fuel control for variably limiting the flow of fuel into the burner along with a discrete air control for generating a variable flow of air into the burner. The respective fuel and air controls are directed by a control system which operates these controls in order to provide and maintain a desired fuel-to-air ratio between high fire and low fire in response to a requirement for heat. A multiple burner embodiment is disclosed in which a plurality of the present integrated burners may be used to create a multiple burner system which provides a greater degree of control and efficiency than that capable with previous systems. The multiple burner embodiment also eliminates the costly installation and maintenance requirements typically associated with previous systems.

Claims

1. An integrated burner system for combusting two reactants comprising:

a burner for receiving a first reactant and a second reactant in order to effect combustion;

a flow control formed integrally with the burner for variably limiting and controlling the rate of flow of the first reactant into the burner in response to the demands of the system;

a blower assembly formed integrally with the burner for generating a variable rate of pressure and flow of the second reactant into the burner;

a flow control system for measuring reactant flows and directing the operation of the blower assembly so that the variable rate of flow of the second reactant is generated in response to the rate of flow of the first reactant so as to maintain a desired fuel-to-air ratio.

2. The burner system of claim 1 wherein the control system further comprises a first reactant pressure differential transducer and a second reactant pressure differential transducer for respectively measuring the flows of the first and second reactants, wherein the control system directs the blower assembly to produce a variable rate of flow in response to signals received from the respective transducers.

3. The multiple burner system of claim 2 wherein the first reactant is fuel and the second reactant is air and wherein:

the first reactant transducer measures a pressure differential across a metering device and generates a first signal representative of the fuel flow into the burner, said first signal is received by said control system;

a second reactant transducer which measures the air pressure differential between the burner and atmospheric and generates a second signal representative of the air flow through the burner, said second signal is received by said control system;

and wherein the control system compares the respective first and second signals in order to vary the produced air flow rate in response to the fuel flow rate so as to establish a predetermined fuel-to-air ratio.

4. The burner system of claim 1 wherein the flow control includes a control motor which opens and closes a valve in response to signals received from the control system and wherein the blower assembly includes an impeller attached to a motor driven by a variable speed drive which rotates the impeller to produce the variable rate of second reactant flow in response to signals received from the control system.

5. The burner assembly of claim 1 wherein the burner is a single burner system.

6. The burner assembly of claim 1 wherein the burner is one of a plurality of such burners which are used in a multiple burner system.

7. The burner system of claim 1 wherein said first reactant is gas fuel and the second reactant is air.

8. A multiple burner system for combusting two reactants, said burner system comprising:

a common reactant source assembly for providing a first reactant to be combusted;

a plurality of burner elements for admitting the first reactant to each burner from the common reactant source assembly and combusting the first reactant with a second reactant, each of said plurality of burner elements further comprising;

an adjustable flow control, formed integrally with the respective burner element, for controlling the flow of the first reactant into the burner;

a blower assembly, formed integrally with the respective burner element, for generating a variable flow of the second reactant into the burner element; and

a control system for measuring reactant flows and directing the operation of the blower assembly so that the variable rate of flow of the second reactant is generated in response to the rate of flow of the first reactant so as to maintain a desired fuel-to-air ratio.

9. The multiple burner assembly of claim 8 wherein the control system further comprises a first reactant pressure differential transducer and a second reactant pressure differential transducer for respectively measuring the flows of the first and second reactants, wherein the control system directs the blower assembly to generate a variable rate of flow in response to signals received from the respective transducers.

10. The multiple burner system of claim 9 wherein the first reactant is fuel and the second reactant is air and wherein:

the first reactant transducer measures a pressure differential across a metering device, and generates a first signal representative the fuel flow into the burner, said first signal is received by said control system;

a second reactant transducer which measures the air pressure differential between the burner and atmospheric, and generates a second signal representative of the air flow through the burner, said second signal is received by said control system;

and wherein the control unit compares the respective first and second signals in order to vary the air flow rate in response to the fuel flow rate so as to achieve a predetermined fuel-to-air ratio.

11. The multiple burner system of claim 8 wherein each respective flow control includes a control motor which opens and closes a valve in response to signals received from the control system and wherein the blower assembly includes an impeller attached to a variable speed motor which rotates the impeller to produce the variable rate of second reactant flow in response to signals received from the control system.

12. The multiple burner system of claim 8 wherein each of said plurality of burner elements is controlled by its own respective control system.

13. The multiple burner system of claim 8 wherein each of said plurality of burner elements is controlled by a common control system.

14. The multiple burner system of claim 8 wherein said first reactant is gas fuel and the second reactant is air.