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Metering combustion control

a technology of combustion control and metering, applied in the direction of combustion regulation, fuel supply regulation, instruments, etc., can solve the problems of considerable skill in tuning and calibrating, current known and implemented and the current known and implemented metered cross-limited combustion control strategies are not entirely satisfactory

Inactive Publication Date: 2009-06-04
PREFERRED UTILITIES MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently known and implemented combustion control strategies are not entirely satisfactory.
The currently known and implemented metered cross-limited combustion control strategies are not entirely satisfactory.
This combination requires considerable skill to tune and calibrate, and results in a slow firing rate demand response time.

Method used

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  • Metering combustion control
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Examples

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Embodiment Construction

[0017]The basic purpose and intent of a combustion control strategy in a fired equipment is to maintain as stated above a process variable equal to a desired set-point by directing a firing rate demand signal to a fuel flow regulating element and a combustion air flow regulating element in the fired equipment. Such fired equipment may be for example, a steam generator, a hot water heater, a boiler, a chemical process heater, a heated manufacturing process, or other boiler combustion fired equipment although the invention is not limited to such fired equipment. For purposes of explanation and by way of example only, consider a steam generator. In this case the process variable is the steam pressure. Under the combustion control strategy, a reduction in the steam pressure relative to the set-point of the desired pressure results in an increase in the master firing rate demand signal with a coincidental call for an increase in the fuel input and combustion air input to the burner to in...

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PUM

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Abstract

Metering combustion control in a fired equipment is disclosed in which both the fuel flow rate and the combustion air flow rate are metered in a desired ratio corresponding to a master firing rate demand, and the master firing rate demand combustion air flow directed to the combustion air regulating element is trimmed in response to an error based correction adjustment determined from the respective values of the fuel flow meter and combustion air flow meter input signals to drive the ratio between the fuel flow rate and the combustion air flow rate toward the desired ratio for controlling the combustion in accordance with the master firing rate demand.

Description

FIELD OF THE INVENTION[0001]The present invention relates generally to combustion control for use in fired equipment and deals more particularly with a metering combustion control for fired equipment.BACKGROUND OF THE INVENTION[0002]Combustion control strategies applied to fired equipment, both commercial and industrial, generally are one of three general category types or some subtle variation to one or the other of them. The control strategies as known to a person skilled in the art are: 1) single point positioning control also known as jackshaft positioning; 2) parallel positioning control; and 3) metered cross-limited control.[0003]Each of these are fuel / air ratio combustion control strategies wherein a firing rate demand signal generated as a result of an attempt to maintain a selected “process variable” (PV) equal to a desired “set-point” (SP) is simultaneously directed to a fuel flow regulating element and a combustion air flow regulating element.[0004]The currently known and...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F23N1/02
CPCF23N1/022F23N5/006F23N2041/10F23N2041/04F23N2023/36F23N2223/36F23N2241/04F23N2241/10
Inventor LAVELLE, PETER
Owner PREFERRED UTILITIES MFG
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