Fluidized bed temperature control method based on parameter identification

Abstract

The invention discloses a fluidized bed temperature control method based on parameter identification. The fluidized bed temperature control method based on parameter identification includes establishing a parameter identification function with a stable point according to a coal feeding quantity and a coal quantity feedback value so as to obtain a difference value between a constant parameter and a coal feeding quantity expectation value; identifying a model by a least square method according to the coal feeding quantity and fluidized bed temperature, and performing self-adaptive PID (proportion-integration-differentiation) control so as to obtain an increment of the coal feeding quantity; identifying a constant parameter by the least square method so as to well compensate deviation caused by an execution mechanism. Fuel can be utilized maximally according to the difference value and the increment computed in the first two steps. The fluidized bed temperature control method based on parameter identification has the advantages that the coal feeding quantity and the fluidized bed temperature can be in the stable states only by means of self-adaptive PID control without manual change of operators; the method is high in precision and is easily used for a fluidized bed boiler; energy waste is reduced, and pollutant discharge is reduced, and service life of the fluidized bed boiler is prolonged.

Description

technical field [0001] The invention belongs to the technical field of fluidized bed temperature control, in particular to a method for controlling fluidized bed temperature based on parameter identification. Background technique [0002] In recent years, the speed of my country's industrial development has greatly exceeded the growth rate of energy, and energy is relatively scarce. my country is one of the countries that do more in the production and use of boilers in the world; boilers are important power equipment in terms of thermal energy production, and at the same time are energy-consuming equipment that uses raw coal as fuel; however, the efficiency of boilers at this stage is not high. At the same time, boiler combustion emits nitrogen oxides, sulfur dioxide, smoke and other pollutants, seriously polluting the atmosphere, which has become one of the main sources of air pollution in my country; with the improvement of people's living standards, environmental protectio...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a fluidized bed temperature control method based on parameter identification, aiming to solve the problem of low efficiency of manual detection of fluidized bed temperature by coal scales, detection accuracy that does not meet ideal requirements, and coal supply Too much will cause insufficient combustion of fuel, resulting in unnecessary waste, and the actual coal supply exceeds or falls below the set coal supply.

Images