Power output determination by way of a fuel parameter

Patent metadata

Field	Value
Publication number	US-12565994-B2
Application number	US-202217682006-A
Country	US
Kind code	B2
Filing date	Feb 28, 2022
Priority date	Feb 26, 2021
Publication date	Mar 3, 2026
Grant date	Mar 3, 2026

Abstract

Various embodiments include a method for regulating a burner appliance comprising a combustion chamber, an air supply duct with an actuator to adjust the air supply, and a fuel supply duct with a fuel actuator to adjust the fuel supply. The method comprises: determining the value of the air supply V L; determining the value of an air ratio λ; providing an individual scalar fuel parameter h; calculating the power output P_ist of the appliance based on the air supply V L, the air ratio λ, and the individual scalar fuel parameter h using P_ist=h/λ·V L; and regulating the burner appliance with the fuel actuator and the air actuator until the actual value reaches the target value.

First claim

The invention claimed is:

1 . A method for regulating a burner appliance comprising a combustion chamber, an air supply duct leading to the combustion chamber with an air actuator configured to adjust a value of an air supply V′_L through the air supply duct, and a fuel supply duct leading to the combustion chamber with a fuel actuator configured to adjust a value of a fuel supply V′_B through the fuel supply duct, the method comprising:
determining the value of the air supply V′_L;
determining a value of the air ratio λ;
providing an individual scalar fuel parameter h;
calculating an actual value of a power output P_ist of the burner appliance based on the value of the air supply V′_L, the value of the air ratio λ, and the individual scalar fuel parameter h using P_ist=h/λ·V′_L; and
regulating the burner appliance with the fuel actuator and the air actuator based on the actual value P_ist and a target value P_soll of the power output until the actual value reaches the target value.

2 . The method for regulating a burner appliance as claimed in claim 1 , the method further comprising:
ascertaining an air ratio signal using an air ratio sensor in the combustion chamber; and processing the air ratio signal to determine the measured value of the air ratio.

3 . The method for regulating a burner appliance as claimed in claim 1 , the method further comprising:
ascertaining an air ratio signal using an air ratio sensor in an exhaust gas duct of the burner appliance; and processing the air ratio signal to determine the measured value of the air ratio.

4 . The method for regulating a burner appliance according in claim 1 , the method further comprising:
ascertaining an air supply signal using an air supply sensor; and processing the air supply signal to determine the measured value of the air supply V′_L.

5 . The method for regulating a burner appliance according to claim 1 , the method further comprising:
transmitting an air actuator signal to the air actuator; adjusting the value of an air supply V′_L through the air supply duct with the air actuator as a function of the air actuator signal; and determining a value of the air supply V′_L through the air supply duct as a function of the air actuator signal and/or as a function of a rotational speed reported back.

6 . The method for regulating a burner appliance according to claim 1 , wherein:
the burner appliance comprises a mass flow sensor arranged in the air supply duct or in fluid connection with the air supply duct; ascertaining the air supply signal as a measurement for the value of the air supply V′_L through the air supply duct to the combustion chamber comprises:
ascertaining a signal from a mass flow sensor corresponding to a value of the air supply V′_L through the air supply duct; and
processing the air supply signal to determine the measured value of the air supply V′_L.

7 . The method for regulating a burner appliance according to claim 1 , the method further comprising:
calculating a ratio h/λ of the individual scalar fuel parameter h and the value of the air ratio λ; and calculating the actual value P_ist as a function of the calculated ratio h/λ and the value of the air supply V′_L.

8 . The method for regulating a burner appliance as claimed in claim 7 , further comprising calculating the actual value P_ist by multiplying the calculated ratio h/λ by the value of the air supply V′_L.

9 . The method for regulating a burner appliance ( 1 ) according to claim 7 , the method further comprising:
providing the individual scalar fuel parameter h as energy of a fuel per air volume and/or per air mass and/or per amount of substance of the air supply V′_L in the case of stoichiometric portions of the fuel supply V′_B and air supply V′_L; and calculating the ratio h/λ from the provided individual scalar fuel parameter h and the value of the air ratio λ.

10 . The method for regulating a burner appliance as claimed in claim 1 , the method further comprising:
ascertaining an air ratio signal using an air ratio sensor and processing the air ratio signal to determine a value of the air ratio λ; ascertaining an air supply signal for a value of the air supply V′_L and processing the air supply signal to determine the value of the air supply V′_L; ascertaining the fuel supply signal for a value of a fuel supply V′_B, and processing the fuel supply signal to determine the value of the fuel supply V′_B; calculating a minimum air requirement as a function of the value of the air supply V′_L and the value of the fuel supply V′_B and the value of the air ratio λ; comparing the calculated minimum air requirement with the minimum air requirement of the characteristic value stored in the memory of the regulating and/or controlling and/or monitoring facility; allocating a fuel group from the comparison; and providing the individual scalar fuel parameter h as a function of the allocated fuel group.

11 . The method as claimed in claim 10 , wherein the air supply duct ( 11 ) leads directly to the combustion chamber ( 2 ) and the fuel supply duct ( 6 ) leads directly to the combustion chamber ( 2 ), the method further comprising:
ascertaining the air supply signal for a value of the air supply V′_L directly to the combustion chamber, and processing the air supply signal to determine the value of the air supply V′_L; and ascertaining the fuel supply signal for a value of a fuel supply V′_B directly to the combustion chamber, and processing the fuel supply signal to determine the value of the fuel supply V′_B.

12 . The method as claimed in claim 10 , wherein the air supply duct and the fuel supply duct issue upstream of the combustion chamber into a common mixture feed leading to the combustion chamber, the method further comprising:
ascertaining the air supply signal for the value of the air supply V′_L to the common mixture feed, and processing the air supply signal to determine a value of the air supply V′_L; and ascertaining the fuel supply signal for the value of the fuel supply V′_B to the common mixture feed, and processing the fuel supply signal to determine the value of the fuel supply V′_B.

13 . The method according to claim 10 , wherein:
the characteristic value stored in the memory of the regulating and/or controlling and/or monitoring facility comprises the minimum air requirement in the form of a limit value for the minimum air requirement of a first and a second fuel group from one another; and the method further comprises allocating the calculated minimum air requirement to the first or to the second fuel group with the aid of the limit value.

14 . The method according to claim 10 , wherein calculating the minimum air requirement as a function of the value of the air supply V′_L and as a function of the value of the fuel supply V′_B and as a function of the value of the air ratio λ comprises calculating the minimum air requirement as a quotient from the value of the air supply V′_L and a product from the value of the fuel supply V′_B and from the value of the air ratio λ.

15 . A non-transitory computer-readable memory storage medium storing a set of commands for implementation by a regulating and/or controlling and/or monitoring facility for a burner appliance comprising a combustion chamber, a fuel supply duct leading to the combustion chamber with a fuel actuator configured to adjust a value of a fuel supply V′_B through the fuel supply duct, and an air supply duct leading to the combustion chamber with an air actuator configured to adjust a value of an air supply V′_L through the air supply d

Assignees

• Siemens Ag

Inventors

• Lochschmied Rainer
• Schmiederer Bernd
• Hauter Harald

Classifications

• F23N2005/181

  using detectors sensitive to rate of flow of air · CPC title

• F23N5/184 Primary

  using electronic means · CPC title

• F23N2235/10

  power assisted, e.g. using electric motors · CPC title

• F23N2235/16

  variable flow or proportional valves · CPC title

• F23N2235/06

  at the air intake · CPC title