Abstract: This paper introduces ABB AC500 type PLC in lime kiln control system. PLC in addition to on-site instrumentation for data acquisition and processing, it also used to complete the on-site chain automation machinery and equipment. In addition, the Control Software iFIX as a standard man-machine interface (HMI) was used to monitor the dynamic process of industrial production.
Key words: PLC lime process monitoring iFIX configuration software Abstract: In this paper, we discuss the application of ABB AC500 PLC in ; the process
monitoring and control for limekiln production. The PLC is mainly utilized for collecting
process data as well as realizing auto-controlling of field mechanism. In addition,
iFIX configuration software with a Human man-Machine Interface (HMI) is used
to monitor the dynamical industrial process. Keywords: PLC; Limekiln; Process
Monitoring and Control; iFIX configuration software
Introduction to active lime is essential materials iron and steel industry in recent years the rapid development of China s steel industry, steel industry, therefore the demand on the activity of very large lime, lime quality have a direct impact on the quality of steel, therefore, the use of advanced The automatic control system for improving yield and quality of iron and steel making, are of great significance.
Current programmable controller (PLC) is designed for industrial environment applications designed for industrial control computer, electric control system has become the most widely-core device that not only can implement complex logic control, but also the completion of each sequence or closed loop timing control, and anti-interference ability, high reliability, good stability, small size, long in poor conditions, continuous operation, and programming is simple, easy maintenance, and is equipped with various types of communication interfaces and module processing, can be easily connected at all levels.
1. Monitoring System for lime kiln lime kiln production of raw materials are mainly stone (limestone), finished a lime. The charging port in the shaft kiln adding limestone and coke, after calcined into quicklime, the output to the finished product silos. Control system mainly consists of limestone and coke transport systems, feeding systems, weighing systems, feeding systems, fabric burning system, the cooling air circulation system, combustion air circulation system, exhaust dust circulation, finished out of the kiln, transport systems. And asked to print the report in the main control room, showing the relevant kiln temperature, the subsystems of the operating state, the motor running current.
New lime kiln process design of advanced, high degree of automation, machine next to the manual with all the equipment, main control room manual, automatic main control room of three control modes and fault diagnosis with alarm.
And process design based on user requirements, lime production process monitoring part of the way a typical two-tier monitoring: production management level and field control level. PC with a standard industrial computer (IPC) as the main man-machine interface (Human-Machine Interface), for the production management level, complete the lower machine monitoring, production operations management, primarily for the operator; lower machine by the ABB AC500 Series PLC structure, based on measurement and control level, the completion of the production site of data acquisition and process control, for the production process.
(1) production-oriented production management-level operators, in the HMI display screen to monitor the working conditions of various equipment parameters, and through the HMI to control the adjustment of the production process. According to production machine next to the manual option, main control room manual mode automatic main control room. When the production of abnormal, the alarm information displayed at the HMI. The production of a variety of data storage, management, produce a variety of production reports.
(2) field control level of the manufacturing process, the programmable controlIntelligent devices and field I / O processor, a variety of template composition, based on monitoring level. Completion of the production site a lot of pressure, temperature, flow rate of acquisition and processing, control of the production process. Automatic control system on screen by the vibration feeder, hopper elevators, electronic weighing hopper, single bucket elevator, pallet discharge machine, discharge gate, consisting of shaft kiln filter feeder, feeding and discharge system automatic control, to achieve the selection of raw materials, feeding, unloading automation. In the discharge process to ensure the lime kiln of the closed type, to ensure that only one while the upper and lower discharge gate is turned on. Through the combustion air pressure, cooling the air pressure of PID adjustment to constant pressure control requirements.
According to the above control requirements will be detailed in the following process to meet the lime kiln control system hardware and software configuration required.
2. Hardware configuration to meet the above-mentioned lime kiln process control monitoring system requirements, we use ABB s AC500 series of programmable controllers, AC500 is modular in design.
(1) Advantech s industrial computer (IPC), the operating system for the Windows 2000 Professional, with Pentium ????? processor, 2.66GHz clock speed, 256M memory, 80G hard drive (2) CPU Module: ABB s AC500 Series PLC CPU with PM571, PM581, PM591 three different levels, the system uses the PM581, the CPU, with: LCD display, a set of keys, an SD card expansion port and two integrated serial communication port, CPU backplane integrated Ethernet interface, and keep communication interface CS31 has good compatibility with the characteristics of PLC AC31 series.
(3) Local expansion module: ABB 16-channel AI523 Analog Input Module 2, 8 input / 8 output channels AX522 analog input / output module 1, DX531 digital input / output module (can be set) 4.
(4) Distributed extension: ABB DC551 remote expansion module 1, with CS31 interface, and a 8:00 24V DC digital input, 16 points 24V DC to set the input / output, DX531 digital input / output module 2, DC523 digital output module 1.
(5) Power Module: ABB CP-S power supply, input AC85-264V / Output DC24V, 10A, 5A each one, separately installed.