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Study on Control System of Kiln Outlet Production Line in Cement Industry

Author: LiuBing
Tutor: XiaoJun
School: Wuhan University of Technology
Course: Mechanical and Electronic Engineering
Keywords: Control system PCS7 PLC Profibus-DP Crafts
CLC: TQ172.6
Type: Master's thesis
Year: 2010
Downloads: 93
Quote: 0
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Abstract


With the production scale cement plants growing around the world, increasingly complex production process, as well as significantly improve the quality of products, cement production line requirements for industrial control systems have become more sophisticated, traditional distributed control system DCS has not adapt The modern control requirements. In this situation, this study selected based on Yaotou production line control system Siemens S7-400 series PLC and integrated the CEMAT package SIMATIC PCS7 products. The object of this paper is PCS7 control system, including the analysis of the network structure of the control system with based on Yaotou Production, hardware configuration, network configuration, CFC configuration and the WinCC configuration screen, as well as automatic control of the process method. Specific analysis is as follows: this study a three-tier network architecture Yaotou control system, including the Field equipment, process control layer and operating management. Specifically, the in Hardware configuration process, the system selects the S7-400 series PLC Siemens products in the most high-end, not only to meet the entire cement production line control points up to a thousand points (switch is about the total I / O points the control demand about 85%), and give full play to the superiority of the PLC control switch. In the network configuration, the system selects the combination of Industrial Ethernet and Profibus-DP fieldbus network communications to achieve from the operating management to the field device layer. This paper studied the automatic control based on Yaotou production process, in accordance with the process to divide, process control methods can be divided into two parts, namely Yaotou calcination process control the method and Yaotou cooling process control methods, they are the PCS7 system design of the main content. Process control methods of design ideas are the basis for CFC configuration, range selection and control of the entire production line and critical process parameters are achieved through the CFC configuration. This study based the kiln head calcining process Yaotou primary air volume parameters selected, Yaotou negative pressure control, kiln firing temperature control method and the secondary air temperature based on Yaotou cooling process control clinker grate cooler temperature control mode, the Kiln dust collector exhaust gas temperature control mode. Specifically, Yaotou negative pressure control by adjusting the exhaust fan speed and the corresponding valve opening degree is achieved, to the numerical stability within the scope of the process requirements; secondary air temperature control by adjusting the grate speed to achieve based on field experience, as well as the analysis of the test data, the system grate speed to take the way of hierarchical control, so that the the grate bed of material is heated evenly, and suitable temperature secondary air. In addition, the article also Yaotou time the amount of wind, kiln firing temperature, exhaust gas temperature and other process parameters control methods, to ensure the stable operation of the production line.

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CLC: > Industrial Technology > Chemical Industry > Silicate > Cement Industry > Production process and equipment
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