Monitoring method and optimal control method for supercritical circulating fluidized bed (CFB) boiler combustion signals

Abstract

The invention discloses a monitoring method and an optimal control method for supercritical circulating fluidized bed (CFB) boiler combustion signals. The monitoring method comprises the following steps of: step 1, acquiring and pre-processing field data, and determining an auxiliary variable of an instant combustion carbon quantity model; step 2, building the instant combustion carbon quantity model based on mechanism modeling and data analysis hybrid modeling, and estimating the storage amount of instant combustion carbon in a hearth through a generalized Kalman filter information fusion technology, wherein the instant combustion carbon quantity model is shown in the description; and step 3, building a dynamic heat signal model, a hearth bed temperature signal model and a hearth outlet oxygen signal model through the instant combustion carbon quantity, and predetermining heat, bed temperatures and oxygen. The methods provided by the invention can accurately measure signals of heat, bed temperatures, oxygen and the like of a supercritical CFB boiler in real time, so that the optimal control on supercritical CFB boiler combustion is realized, and the combustion stability of the supercritical CFB boiler is improved.

Description

technical field [0001] The invention relates to a supercritical CFB boiler combustion signal monitoring method and an optimization control method, belonging to the field of thermal parameter monitoring and combustion optimization control of circulating fluidized bed boilers. Background technique [0002] The biggest difference between circulating fluidized bed (CFB) boilers and pulverized coal boilers lies in the different combustion mechanisms. The heat released by the combustion of the pulverized coal furnace comes from the amount of coal that enters the furnace instantaneously. Once the supply of coal is stopped, the combustion will stop soon; while the heat generated by the combustion of the circulating fluidized bed boiler mainly comes from the large amount of unburned coal in the boiler. Burning carbon, not the amount of coal added instantly. The circulating fluidized bed is similar to a charging "battery". There is a large amount of unburned and combustible carbon in...

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Problems solved by technology

[0006] In the field, special instruments can be used to take out the bed material from the boiler for component analysis and research, but the cost of the experiment is very high, and the reliability cannot be guaranteed, and the non-uniform distribution of the instant carbon in the bed material will lead to measurement errors. Inaccurate, the content of instant carbon measured in one kilogram of bed material taken out may have a certain error from the average value of instant carbon in the actual furnace

Therefore, the current carbon stock is an unmeasurable variable, which brings difficulties to the adjustment and control of the circulating fluidized bed combustion system. Estimation is a burning problem

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