Method and device for controlling the combustion in furnace systems

Patent metadata

Field	Value
Publication number	US-12553607-B2
Application number	US-202017776494-A
Country	US
Kind code	B2
Filing date	Nov 10, 2020
Priority date	Nov 13, 2019
Publication date	Feb 17, 2026
Grant date	Feb 17, 2026

Abstract

This application relates to a method for controlling the combustion in furnace systems, wherein an oxygen coefficient is determined from the temperature in a combustion chamber area and/or in the waste-gas flues of the furnace system and on the basis of an energy balance of the combustion process in the furnace system, the combustion air and the waste gas, and said oxygen coefficient is used to control the combustion material flows and therefore the thermal output and also the combustion quality. The invention relates to a device for feeding combustion air in the furnace system, which device has a chamber, which on a first side has a main duct for feeding ambient air and/or air from the chimney system and on a second side has a pane-washing air duct and a secondary-air duct, both the pane-washing air duct and the secondary-air duct.

First claim

The invention claimed is:

1 . A method for controlling a combustion process in a single-room furnace system, the method comprising:
determining an oxygen coefficient from a temperature in a combustion chamber area and/or in a waste gas flue of the single-room furnace system, and an energy balance of the combustion process in the single-room furnace system, and an amount of a combustion air, and an amount of a waste gas; and controlling a primary combustion air flow and a secondary combustion air flow, and thus a thermal output and a combustion quality, by means of the oxygen coefficient.

2 . The method of claim 1 , wherein an oxygen demand for the combustion process is calculated according to the following formula:
O 2 =(21*λ−21)/λ,
where λ is determined as follows
λ=1+[17.000× k B /[[0.995+0.0002××ϑ R ×k F ]×ϑ R ×k F ×[0.241×17.000× k B /1.000]+0.5]]−[0.217× H u ×k B /1.000+1.67]/[0.241× H u ×k B /1.000+0.5]]

where k B has a value of 0.80 to 1.2, ϑ R is a waste gas and/or combustion chamber temperature, k F has a value of 1 to 4, and H u is the calorific value of fuel combusted in the combustion process.

3 . The method of claim 1 , wherein the temperature in the combustion chamber area and/or in the waste gas flue is measured at at least one point.

4 . The method of claim 1 , wherein the temperature in an installation room of the single-room furnace system is measured for a heat production in accordance with demand.

5 . The method of claim 1 , wherein the primary air is pane-flushing air and/or grate air.

6 . The method of claim 1 , wherein the supply of secondary air is affected in such a way that the oxygen content in the combustion chamber area is about 7 vol. % to about 10 vol. %.

7 . The method of claim 1 , wherein the control of the combustion process takes place automatically.

8 . The method of claim 1 , wherein the supply of secondary air is affected in such a way that the oxygen content in the combustion chamber area is about 8 vol. % to about 9 vol. %.

Assignees

• Fraunhofer Ges Forschung

Inventors

• Aleysa Mohammadshayesh

Classifications

• F24B1/028

  with means for regulating combustion · CPC title

• F23N2235/10

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

• F23N2225/10

  stack temperature · CPC title

• F23L13/00

  Construction of valves or dampers for controlling air supply or draught · CPC title

• F23B60/02

  with combustion air supplied through a grate · CPC title