Feedback control method for calcination process in rotary kiln

A feedback control and rotary kiln technology, which is applied in the direction of electrical program control, controller with specific characteristics, electric controller, etc., can solve problems such as inability to measure online, and achieve the effects of reducing control costs, qualified product quality, and stable operation

Inactive Publication Date: 2009-09-16
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

This method is based on the actual situation of my country's rotary kiln enterprises, aiming at the problem that the quality of rotary kiln products cannot be measured online, the "energy factor deviation" is used to quantify the degree to which the calcination process of the rotary kiln deviates from the predetermined working point, thereby indirectly estimating the product calcination quality and realizing the rotary kiln automatic control of

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  • Feedback control method for calcination process in rotary kiln
  • Feedback control method for calcination process in rotary kiln
  • Feedback control method for calcination process in rotary kiln

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] The control method proposed by the present invention takes the stability of the calcined product quality of the rotary kiln as the control target.

[0024] According to thermostatistics, the energy obtained by the calcination reaction is proportional to the calcination temperature T; at a certain temperature, the average expected time t required for the reaction to occur satisfies the relationship (1):

[0025] t = a · e C T - - - ( 1 )

[0026] Among them, a and C are constants.

[0027] For each type of powder, given the quality and output requirements, the optimum combination of calcination temperature and calcination time can be determined thro...

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Abstract

The invention discloses a feedback control method for a calcination process in a rotary kiln. The method comprises the following steps: filtering sampling values of the calcination temperature and rotating speed of the rotary kiln; adopting the values after filtering to calculate energy factors of the calcination process in the rotary kiln, and calculating the deviation of the energy factors and specified values of the energy factors, namely 'energy factor deviation' for short, wherein the deviation value reflects the situation that the calcination process in the rotary kiln deviates a preset operating point; and according to the 'energy factor deviation', adopting PI control algorithm to adjust the rotating speed of the rotary kiln to realize the feedback control of the calcination process in the rotary kiln. The method aims to solve the problem that the quality of a rotary kiln product cannot be measured on line, adopts the 'energy factor deviation' to quantitively measure the situation that the calcination process in the rotary kiln deviates the preset operating point, and adjusts the rotating speed of the rotary kiln according to the size of the deviation to realize the feedback control of the rotary kiln.

Description

technical field [0001] The invention relates to the technical field of rotary kiln calcination control, in particular to a feedback control method for the rotary kiln calcination process. Background technique [0002] The rotary kiln process is often accompanied by the characteristics of multi-variable strong coupling, uncertain time-varying, large time-delay and strong nonlinearity, so its control is very difficult. Large foreign companies often use intelligent control methods such as expert systems to achieve hierarchical control of rotary kilns, or use online product quality analyzers to achieve feedback control such as material ratios, which can effectively solve the control problem of the rotary kiln process. However, a complete set of imported rotary kiln control equipment is expensive, and it is difficult to promote it in a large area in my country. [0003] At present, most of the rotary kiln enterprises in our country are still at the level of pure technical transf...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/04G05B11/42F27B7/42
Inventor 毛宗源狄琤刘咏平莫鸿强田联房杜启亮
Owner SOUTH CHINA UNIV OF TECH
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