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Combustion optimization with inferential sensor

A fuel, fuel ratio technology, applied in the direction of burner, combustion type, control combustion, etc., can solve problems such as unsatisfactory and accurate air/fuel ratio, etc.

Inactive Publication Date: 2004-10-27
HONEYWELL INT INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This reactive approach does not guarantee accurate air / fuel ratios during fast transients
While the standard air / fuel interlock relationship provides acceptable steady-state performance, conventional controller-based solutions are not fully satisfactory during transients, such as when used in cyclically operated boilers, especially Yes, if used to reduce excess air for low NO X when burning

Method used

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  • Combustion optimization with inferential sensor
  • Combustion optimization with inferential sensor

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Embodiment Construction

[0014] Detailed description of the preferred embodiment

[0015] The controller system of the present invention is based on pre-control technology. Given the relatively fast dynamic nature of the boiler and the scaling constraints imposed by plant lifetime factors, the present invention focuses on power and heat generating operations. Following the use of pre-control techniques and proportional optimal control (ROC), the basic idea for the next step is tight dynamic coordination of the selected controlled variables.

[0016] attached figure 1 A typical application of MIMO ROC controller 11 in pressure control using simultaneous combustion (air / fuel ratio) optimization is described. in the attached figure 1 In the boiler, air and fuel are input to the boiler 13, and the fuel (pulverized coal) input 15 and the first air input 17 are controlled by the controller 11. In addition to these two basic factors that constitute the air / fuel ratio in the boiler, a second 19 and, where...

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Abstract

A method and system for combustion of fuel in a boiler in which flue gasses are produced. The boiler includes a source of fuel, a source of air, and a controller for controlling the ratio of the source of air and the source of fuel inputted into the boiler. A sensor is used for measuring the concentration of oxygen in the flue gasses. The controller is adapted to calculate the amount of air entering the boiler based on the amount of oxygen in the flue gasses to thereby adjust the air to fuel ratio to include calculated air input and air input from the source of air. A preferred fuel is pulverized. coal. The method and system provide for the air to fuel ratio to be adjusted to optimize efficiency as well as to minimize NOx production.

Description

field of invention [0001] The present invention relates to model-based pre-control techniques for boiler control. More specifically, the invention relates to the coordination of air and fuel during transients to improve efficiency and minimize NO X generation. Background of the invention [0002] The classic method of combustion air control is to use the measurement of the oxygen concentration in the flue gas for feedback control of the combustion air volume. This reactive approach does not guarantee accurate air / fuel ratios during fast transients. While the standard air / fuel interlock relationship provides acceptable steady-state performance, conventional controller-based solutions are not fully satisfactory during transients, such as when used in cyclically operated boilers, especially Yes, if used to reduce excess air for low NO X when burning. [0003] US Patent 5,367,470 to Lang is one of a number of patents describing methods of improving performance through analy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23D1/00F23N1/02F23N5/00F23N5/18
CPCF23N2005/181F23N2023/44F23N2039/02F23N1/022F23D1/00F23N5/006F23N2223/44F23N2239/02
Inventor V·哈勒纳
Owner HONEYWELL INT INC
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