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A system and method for full combustion optimization for pulverized coal-fired steam boilers

A combustion optimization, boiler technology, applied in the direction of combustion method, combustion fuel, control combustion, etc.

Active Publication Date: 2011-01-05
ABB (SCHWEIZ) AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] One element missing from the prior art is the ability to provide a closed-loop controllable flow of an even and balanced air-fuel mixture to the PCFB's burner system

Method used

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  • A system and method for full combustion optimization for pulverized coal-fired steam boilers
  • A system and method for full combustion optimization for pulverized coal-fired steam boilers
  • A system and method for full combustion optimization for pulverized coal-fired steam boilers

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Embodiment Construction

[0015] now refer to figure 2 , shows a block diagram of one embodiment of the system 10 used in the present invention. System 10 includes advanced combustion control and optimization system (COS) 12 . COS 12 models the multivariate nonlinear relationships of the combustion process. Identify the relationship between signals / parameters by analyzing the historical data of the signals / parameters. The COS 12 is based on advanced model predictive control techniques and uses a combustion model and a cost function describing weighted customer optimization objectives to provide setpoints and setpoint bias values ​​18 to a distributed control system (DCS) 14 of the system 10 . DCS 14 includes operator setpoints and provides process values ​​20 to COS 12 . The COS 12 has a model of the process and has as inputs constrained variable limits 22 , controlled variable targets 24 , and manipulated variable targets and limits 26 . An example of a COS 12 is the Optimax Combustion Optimizer ...

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Abstract

A method and system for controlling a pulverized coal fired boiler wherein the flow of a coal / air mixture flowing to each burner is monitored and transmitted to a distributed control system. The distributed control system also monitors and controls the position of dampers in a splitter that feeds the coal / air mixture to the burners. The dampers are controlled in a closed loop fashion to achieve a optimal boiler performance.

Description

Background technique [0001] There are many advanced control techniques for optimizing combustion in pulverized coal fired boilers (PCFBs). These methods typically involve the use of advanced model predictive control and / or neural network based control to monitor, balance and control the intake of fuel and air to various stages of the boiler, including primary, auxiliary, overfire and underfire controls. Other variables such as burner tilt and thermostat injection flow can also be controlled to optimize the combustion process. Thermostats are known to reduce steam temperature by bringing superheated steam into direct contact with water. The steam is cooled by the evaporation of water. [0002] The combustion process should be controlled and optimized for "best possible" performance, thereby meeting the conflicting goals of reducing NOx, reducing CO and unburned fuel, and increasing heat ratio in an economically and / or environmentally optimized manner. However, this optimizat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23K3/02F23N1/02
CPCF23N2023/40F23K3/02F23N2039/02F23N1/022F23N2023/08F23K2203/006F23N2223/08F23N2223/40F23N2239/02
Inventor H·多哈利克P·伊莫南R·维塞尔T·马特斯科
Owner ABB (SCHWEIZ) AG
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