Integrated recognition method for sintering conditions of cement rotary kiln

Abstract

The invention relates to a method for comprehensively identifying the burning working condition for a cement rotary kiln, which belongs to the technical field of cement production. The method comprises the following steps: directly measuring the main process parameters of a burning system of the rotary kiln through a sensor; performing soft measurement on a burning zone temperature which cannot be obtained directly; and classifying current values obtained from the two measurements through dividing the values according to sub links, determining the types of the variation tendency of the current values simultaneously, and classifying the current value of each link and performing comprehensive determination on the types of the variation tendency so as to obtain the specific working condition of the burning system of the rotary kiln. The method effectively solves the problem of automatic identification of the working condition of the rotary kiln resulted from multi-variable of the burning system, strong coupling, nonlinearity, and slow time-varying characteristic, effectively improves the automation level of the fire sighting of the cement clinker burning, integrates with a process optimized system, greatly reduces the cost for clinker burning, and improves the economic benefit for enterprises.

Description

technical field [0001] The invention relates to a method for comprehensively identifying firing conditions of a cement rotary kiln, belonging to the technical field of cement production. Background technique [0002] As the core link of cement production, the cement firing process determines the output and quality of the entire production process, and its coal consumption accounts for about 90% of the total cement production process. Therefore, its optimal control is an important factor for cement enterprises to increase production, save energy and reduce consumption. The key to the implementation of optimal control is the accurate identification and grasp of the working conditions of the cement firing system. [0003] During the firing process, the raw material passes through the four sub-links of the suspension preheater, the calciner, the rotary kiln, and the grate cooler in sequence, and is calcined and cooled to obtain clinker at last; the air enters from the grate cool...

AI Technical Summary

Problems solved by technology

[0005] 1. The firing conditions of the rotary kiln involve many process parameters and interference factors, and it is extremely difficult to identify patterns as a full-dimensional state space

[0006] 2. The firing conditions of the rotary kiln are closely related to other subsystems in the firing process, and the coupling is strong, which brings difficulties to the identification of the rotary kiln working conditions

[0007] 3. The process parameters of the firing zone temperature cannot be directly measured online, and the accurate estimation of these parameters is the basis for the identification of the working conditions of the rotary kiln

[0008] 4. The firing process of the rotary kiln has hysteresis characteristics, which brings difficulties for automatic identification of working conditions

[0009] 5. The firing process of the rotary kiln is nonlinear and time-varying, which brings difficulties to the automatic identification of working conditions

[0010] At present, there is no mature automatic identification system for the working conditions of the cement clinker rotary kiln, and the judgment of the firing conditions of the rotary kiln by each cement production enterprise is still manually synthesized by the fire watchers on the process parameters of the firing system such as temperature, pressure, and current. determination

Due to differences in proficiency, labor intensity, sense of responsibility, equipment characteristics, etc., the identification effect and stability cannot be guaranteed

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