Font Size: a A A

Fieldbus Technology Applied Research, New Dry Process Rotary Kiln Cement Production Process Control

Posted on:2004-11-02Degree:MasterType:Thesis
Country:ChinaCandidate:J HuFull Text:PDF
GTID:2191360092481263Subject:Materials Processing Engineering
Abstract/Summary:PDF Full Text Request
The cement rotary kiln has been developed very soon, especially the decomposition technique. So it is mature and has been applied broadly. But the correspondingly control system for it has been to ameliorated and optimized. The cement rotary kiln control system based on PROFIBUS, combined with Programmable Logic Controller (PLC) and Distributed Control System (DCS) is designed on the thinking of configuring the cement rotary kiln.The net structure of the cement rotary kiln control system has three layers. The first layer, named management layer, consists of seven operational stations connected by Ethernet. These stations configure and maintain the whole kiln system, display and operate the locale equipments. It develops the superiority of DCS in programming and configuration, and makes up the disadvantage of PLC in complex controlling. The second layer connects one data server to one main station by PROFIBUS that is opener, more credible and more distributed than DCS. The data server manages the database of the whole net, and accomplishes the router between Ethernet and PROFIBUS. The main station transmits the total data of the whole system. The third layer, named locale layer, is composed of six subordinate stations. In each station, the PLC with PROFIBUS interface is selected to control the locale equipments and collect the locale data. It improves the advantage of PLC in flexible collocation and being adapt to locale controlling, and makes up the disadvantage of PROFIBUS in expensive intelligentized locale equipments.Subordinate stations use fuzzy control technology to control the load of the mid-discharging mill, the load of the air swept mill, the temperature of decomposing furnace, the temperature of firing zone, the temperature of exhaust gas, thetemperature of secondary air and the load of the cement mill, use PID algorithm control of cumulate windage to control raw material batch and cement batch. These control methods accomplish the real-time supervisal, analysis and optimization of the cement rotary kiln.
Keywords/Search Tags:PROFIBUS, PLC, DCS, the cement rotary kiln, fuzzy control
PDF Full Text Request
Related items