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Burner controller and adjusting method for a burner controller

a burner controller and burner technology, applied in the direction of combustion regulation, fuel supply regulation, combustion process, etc., can solve the problems of adverse effects on inability to continuously adjust the level of regulating accuracy, and inability to achieve reliable and accurate regulating of the air index

Inactive Publication Date: 2005-11-10
SIEMENS BUILDING TECHNOLOGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011] The object of the invention is to propose a burner controller which permits reliable and accurate regulation of the air index.

Problems solved by technology

Under some circumstances however the level of regulating accuracy is adversely affected because of changes in the flame shape and size which can occur even with a constant burner power output.
In certain burner installations however which are mostly equipped with an atmospheric burner the level of regulating accuracy is adversely affected by the above-mentioned problem of changes in flame shape and size.
Although calibration corrects the above-mentioned adverse effects on accuracy at regular intervals, it cannot do that continuously.

Method used

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  • Burner controller and adjusting method for a burner controller
  • Burner controller and adjusting method for a burner controller
  • Burner controller and adjusting method for a burner controller

Examples

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Embodiment Construction

[0023]FIG. 1 diagrammatically shows the operating principle of ionization evaluation device 14 in a burner controller according to the invention. In an equivalent circuit a flame 1 is represented by a diode 1a and a resistor 1b. An ac voltage of for example 230V is applied across L and N. If a flame 1 is present, a greater current flows through a blocking capacitor 3 in the positive half-wave than in the negative half-wave, by virtue of the flame diode 1a. As a result, a positive dc voltage UB is produced at the blocking capacitor 3 between L and a resistor 2 which is provided for the purposes of electric-shock contact protection.

[0024] Therefore a direct current flows through a decoupling resistor 4 from N to the blocking capacitor 3. In that situation the magnitude of the direct current depends on UB and thus directly on the flame resistor 1b. The flame resistor 1b also influences the alternating current through the decoupling resistor 4, but to a differing degree from the direct...

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PUM

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Abstract

A burner controller (15) regulates the air index, with a combustion sensor. In accordance with the invention the reference value of the sensor signal is determined not only with the current burner power output but also on the basis of a measure for the current fuel energy content.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The invention relates to a burner controller which ensures inter alia that in a burner the ratio of the amount of air to the amount of fuel, referred to as the air index or lambda, is properly set over the entire power range. [0003] 2. Description of Prior Art [0004] In general lambda is to be slightly over the stoichiometric value of 1, for example 1.3. [0005] Advantageously the air index is regulated, for which purpose the arrangement needs a sensor which directly or indirectly observes the combustion process. As is known that purpose is served by using through-flow sensors in the feed passages, a gas sensor in the exhaust gas passage, a temperature sensor at the combustion chamber wall, a radiation sensor in the combustion chamber, or an ionization electrode in the flame. Under some circumstances however the level of regulating accuracy is adversely affected because of changes in the flame shape and size which ca...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F23N1/02F23N5/00F23N5/12
CPCF23N1/02F23N1/022F23N5/123F23N5/12F23N5/00
Inventor LOCHSCHMIED, RAINER
Owner SIEMENS BUILDING TECHNOLOGIES
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