Coal-burning boiler system mixing control method

Abstract

The invention relates to a coal-fired boiler system hybrid controlling method. In the method, a real-time data driving method is firstly used for establishing a process model; concretely, the collected real-time process running data is taken as a sample set of data driving; based on the set, a local controlled autoregressive moving average model in the form of discrete difference equation based on a least square method is established; secondly, a typical response curve method is used to design the proportional integral derivative controllers of the process model; the designed proportional integral derivative controllers of the process model are then used to design the prediction proportional integral derivative controllers. The control method of the invention compensates the shortages of traditional controlling, effectively facilitates the design of the controllers, ensures the improvement of the controlling performance and complies with the given production performance indexes at the same time. The coal-fired boiler system hybrid controlling method effectively reduces the error between the ideal process parameters and practical process parameters, ensures that the control device runs under the best state and leads the process parameters to be strictly controlled.

Description

technical field [0001] The invention belongs to the technical field of automation, and relates to a data-driven predictive proportional-integral-differential hybrid control method for a coal-fired boiler. Background technique [0002] Coal-fired boiler is an important power equipment in the power production department. Its requirement is to supply qualified steam so that the steam output of coal-fired boiler can meet the needs of the load. For this reason, each main process parameter of the production process must be strictly controlled. However, coal-fired boiler equipment is a complex controlled object, and the input and output are interrelated. For example: changes in steam load will inevitably cause changes in drum water level, steam pressure and superheated steam temperature; changes in fuel volume not only affect steam pressure, but also affect drum water level, superheated steam temperature, excess air and furnace negative pressure; water supply The change of water ...

AI Technical Summary

Problems solved by technology

These unfavorable factors lead to low precision of traditional control methods, which further lead to instability of subsequent production control parameters, low product qualification rate, and low boiler efficiency

At present, the control of coal-fired boilers in the actual industry basically adopts traditional simple control methods, and the control parameters are completely dependent on the experience of technicians, which increases the production cost and the control effect is not ideal.

my country's coal-fired boiler control and optimization technology is relatively backward, with high energy consumption, poor control performance, and low degree of automation. It is difficult to meet the needs of energy conservation, emission reduction, and indirect environmental protection. One of the direct influencing factors is coal combustion. Boiler System Control Scheme Questions

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