A Novel AGC Control Method for Circulating Fluidized Bed Boiler

Abstract

The invention discloses a novel AGC control method of a circulating fluidized bed boiler. The novel AGC control method comprises the following steps that S1, the step response coefficient of a controlled object is acquired; S2, the state space approximate expression form of the controlled object is acquired; S3, a prediction model of predictive control is acquired; S4, rolling optimization of the control method is carried out; and S5, feedback compensation of the control method is carried out. According to the method, the dynamic adjustment function of primary air on the boiler side on the unit power of the steam engine side in the dynamic process of the circulating fluidized bed boiler is fully utilized, hearth bed materials are fully utilized for energy storage, the lagged effect of the boiler fuel amount is reduced, and the disturbance suppression capacity of a system can be improved through an improved predictive control algorithm.

Description

technical field [0001] The invention relates to the research field of AGC control of a circulating fluidized bed, in particular to a novel AGC control method of a circulating fluidized bed boiler. Background technique [0002] Energy is the foundation of national economic development, and coal resources occupy a very important position in my country's primary energy structure, and its proportion is about 70%. On the other hand, the development and utilization of coal will produce a large amount of carbon dioxide, sulfur dioxide and Nitrogen oxides, thus causing serious environmental problems, in this context, the development of clean coal technology is imperative. Compared with other clean coal technologies, circulating fluidized bed technology is a more suitable choice in terms of technical completeness and economic applicability, both in line with my country's current national conditions. [0003] As a new type of coal combustion technology, circulating fluidized bed boile...

AI Technical Summary

Problems solved by technology

At the same time, for the units connected to the grid, the power grid often has precise and strict requirements on the load of the units. As far as the technical requirements of the power grid in my country are concerned, the rate of lifting and lowering the load of the unit during AGC joint debugging should reach more than 2.0MW / min, and The load steady-state control accuracy is within ±0.5% Pe, and the maximum load dynamic control accuracy is within ±1.5% Pe, that is, the unit often needs to complete a large-scale load tracking in a short period of time. The traditional fluidized bed boiler is due to the boiler side The delay and large inertia, the AGC load lifting rate and accuracy are often not well guaranteed, so the new situation also puts forward new requirements for the AGC control structure of the unit

[0004] In addition, with the increasing size and complexity of industrial systems, a large number of complex time-varying disturbances containing non-stationary random signals have an increasingly serious impact on the normal operation of the control system

The decline in the performance of the control system will further cause frequent fluctuations in the production process, which will not only directly affect the quality of the product and the safe operation of the system, but also lead to accelerated wear and tear of equipment.

Images