CN-121977344-A - Rotary kiln automatic control feeding system

CN121977344ACN 121977344 ACN121977344 ACN 121977344ACN-121977344-A

Abstract

The invention discloses an automatic control feeding system of a rotary kiln, which comprises a storage bin, a storage bin weighing module, a storage bin humidity sensor, a blanking rotary valve, a feeding bin, a feeding stirring device, a feeding auger driving device and a central control room feeding control system. The outlet of the storage bin is communicated with the inlet of the feeding bin through a blanking rotary valve, and the outlet of the feeding bin is communicated with the inlet of the feeding auger. The feeding bin is provided with a high-level liquid level gauge and a low-level liquid level gauge, and the central control room feeding control system controls the starting and stopping of the blanking rotary valve according to the material level signal. The material storage bin weighing module acquires the blanking weight in real time, and the central control room feeding control system adjusts the rotating speed of the feeding auger through a PID or fuzzy self-adaptive algorithm based on the flow deviation. The bottom of the feeding bin is provided with a speed-adjustable stirring device, and a central control room feeding control system integrates a material humidity compensation algorithm to correct the target rotating speed of the feeding auger. The system realizes high-precision feeding control, effectively prevents bridging of materials, adapts to materials with different humidity, and remarkably reduces energy consumption and equipment abrasion.

Inventors

YANG QINGQING
FU MIN
ZHANG HONG
LI GANGGANG
XU BO
LIU XIN
WANG FEI
DU PENGCHAO
DU CHANGLONG

Assignees

金川集团镍钴股份有限公司
兰州金川新材料科技股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260319

Claims (10)

1. An automatic control feeding system of a rotary kiln is characterized by comprising a storage bin (7) and a central control room feeding control system; the top of the storage bin (7) is provided with a storage bin weighing module (8), the bottom of the storage bin is provided with a storage bin humidity sensor (13), a material outlet of the storage bin (7) is communicated with a material inlet of the blanking rotary valve (6), a material outlet of the blanking rotary valve (6) is communicated with a material inlet of the feeding bin (5), the top of the feeding bin (5) is provided with a feeding bin high-level liquid level gauge (10), the bottom of the feeding bin is provided with a feeding bin low-level liquid level gauge (11), the bottom of the feeding bin (5) horizontally penetrates through the feeding bin low-level liquid level gauge, a feeding auger (3) which is driven to rotate by the feeding auger driving device (1) is arranged below the feeding stirring device (4) and the feeding bin (5), and a material outlet of the feeding auger (3) is communicated with a feeding inlet of the rotary kiln (12); The method for automatically feeding the rotary kiln (12) through the automatic control feeding system comprises the following steps: The material moisture content is obtained through a storage bin humidity sensor (13), weight data are obtained through a storage bin weighing module (8) at a sampling frequency not lower than 1 Hz, humidity and weight data are uploaded to a central control room feeding control system in real time, the central control room feeding control system integrates a material humidity compensation algorithm, a PID algorithm or a fuzzy self-adaptive control algorithm based on minute-level flow deviation, and the target rotating speed of a feeding auger (3) is automatically corrected by combining a preset target feeding weight, humidity and conveying efficiency model.
2. An automatic control feeding system for a rotary kiln according to claim 1, wherein the power output end of the feeding auger driving device (1) is connected with the feeding auger (3) through a connecting pair of wheels (2), and a flexible gasket is arranged between the connecting pair of wheels (2).
3. An automatically controlled feeding system for rotary kilns according to claim 1, wherein said feeding and stirring means (4) comprise stirring blades (15) driven by a gear motor, the rotation speed of which can be adjusted in the range of 10-50 revolutions per minute, for matching the optimal stirring intensity according to the characteristics of the material.
4. An automatic control feeding system for a rotary kiln according to claim 3, wherein the speed reducing motor is connected with the stirring blade (15) through a stirring device transmission shaft (14), and the stirring device transmission shaft (14) is connected with the stirring blade (15) through a fastener (16).
5. An automatic control feeding system for rotary kiln according to claim 1, characterized in that the blanking rotary valve (6) is driven to open and close by a blanking rotary valve driving device (9).
6. An automatically controlled feeding system for rotary kilns according to claim 1, wherein the feeding auger (3) is mounted on a feeding auger holder (17).
7. The automatic control feeding system of a rotary kiln according to any one of claims 1 to 6, wherein the execution PID algorithm based on minute-level flow deviation is based on a deviation adjustment core, and the corresponding control signal is output according to the real-time flow deviation between the set value and the actual value through the synergistic effect of three links of proportion (P), integral (I) and derivative (D), so as to adjust the output frequency of the feeding auger driving device (1) and further change the rotation speed of the feeding auger (3) to eliminate the flow deviation.
8. The rotary kiln automatic control feeding system according to claim 7, wherein the fuzzy self-adaptive control algorithm is that a fuzzy reasoning mechanism is introduced when the PID control algorithm has large material humidity fluctuation, complex working conditions and difficult real-time adaptation of parameters and reduced adjustment accuracy, and the control parameters are self-adaptively adjusted according to the real-time working conditions.
9. The rotary kiln automatic control feeding system according to claim 8, wherein the execution PID algorithm and the fuzzy self-adaptive control algorithm based on the minute-scale flow deviation are switched through a central control room interface by one key according to the working condition.
10. The automatic control feeding system of the rotary kiln according to claim 9, wherein the execution PID algorithm and the fuzzy self-adaptive control algorithm based on the minute-level flow deviation are built in a central control room feeding control system algorithm switching module, and the switching process does not need to be stopped, and the specific steps are that (1) a hit control interface 'algorithm switching' button is clicked, and a target algorithm is selected; the system automatically saves the parameters of the current algorithm and loads the preset parameters of the target algorithm, and (3) the system smoothly transits, the output frequency adjustment is continuously executed by the target algorithm, the feeding flow has no obvious fluctuation, and the switching process takes less than or equal to 3 seconds.

Description

Rotary kiln automatic control feeding system Technical Field The invention relates to the field of metallurgical technology and industrial automation control of rotary kilns, in particular to an automatic control feeding system of a rotary kiln. Background The stability of the rotary kiln as a core thermal equipment in the industries of building materials, metallurgy, chemical industry and the like directly determines the quality, the yield and the energy consumption of products. The feeding system is used as a source of the rotary kiln process flow, and the conveying precision and the continuity of the feeding system are key factors for guaranteeing the stability of the working condition of the rotary kiln. In actual production, the raw materials are mostly in powder or granule form, so that the raw materials are extremely easy to be influenced by factors such as ambient humidity, bulk density change and the like, and the feeding process is fluctuated or even interrupted. At present, the automatic control of a rotary kiln feeding system has been studied and applied. For example, chinese patent CN213578691U discloses a stable feeding system, which realizes closed-loop adjustment of liquid slurry flow through cooperation of a stirring device, a variable frequency conveying pump, a flowmeter and a controller, and alleviates the influence of unstable feeding on product quality in wet calcination. However, the system is suitable for feeding liquid slurry, the essential influence of physical property changes such as powdery and granular materials on feeding precision is not considered, the stirring device has no pertinence bridge-preventing design, and the problems of insufficient suitability in coping with the powdery and granular materials due to lack of a material characteristic detection and compensation module are solved. In addition, the existing rotary kiln feeding control technology still has the following limitations that firstly, equipment operation monitoring or thermal parameter (such as temperature) feedback control is emphasized, and feedforward influence of material physical property change is ignored. Particularly, when the water content of the material changes along with the environment, the stacking density and the fluidity of the material can be obviously changed, so that larger deviation is generated between the volume flow and the target flow which are conveyed by an auger, and the prior art lacks a real-time compensation mechanism for the humidity of the material. Therefore, developing a high-precision rotary kiln feeding system integrating an active bridging prevention function and an environmental adaptability compensation algorithm becomes a technical problem to be solved at present. Disclosure of Invention The invention aims to provide an automatic control feeding system of a rotary kiln, aiming at the technical problems that in the prior feeding technology of the rotary kiln, powdery materials are easy to bridge due to moisture, the feeding is interrupted, the deviation between the actual feeding quantity and the target quantity is large due to the change of the water content of the materials, and the nonlinear and large hysteresis characteristics of the feeding process of the rotary kiln are difficult to deal with by the traditional single PID control. In order to achieve the above purpose, the present invention adopts the following technical scheme: an automatic control feeding system of a rotary kiln comprises a storage bin and a central control room feeding control system; The top of the storage bin is provided with a storage bin weighing module, the bottom of the storage bin is provided with a storage bin humidity sensor, a storage bin material outlet is communicated with a blanking rotary valve material inlet, and a blanking rotary valve material outlet is communicated with a feeding bin material inlet; The method for automatically feeding the rotary kiln by the automatic control feeding system comprises the following steps: The method comprises the steps of acquiring the water content of materials through a storage bin humidity sensor, acquiring weight data at a sampling frequency not lower than 1 Hz through a storage bin weighing module, uploading the humidity and weight data to a central control room feeding control system in real time, wherein the central control room feeding control system integrates a material humidity compensation algorithm, a PID algorithm or a fuzzy self-adaptive control algorithm based on minute-level flow deviation, and automatically correcting the target rotating speed of a feeding auger by combining a preset target feeding weight, humidity and conveying efficiency model. As a further improvement of the technical scheme of the invention, the power output end of the feeding auger driving device is connected with the feeding auger through a connecting pair of wheels, and a flexible gasket is arranged between the connecting pair of wheels. Further, the f