1. Overview
we know that the compressor discharge air is not clean, in addition to containing water (including water vapor, condensation water) and suspended solids, but also with oil (including oil mist, oil steam). These pollutants increase productivity, reduce operating costs, improve product quality is negative, so on the need for drying purification. Drying compressed air purification equipment is widely used in power generation, textile and chemical fiber, electronics, chemicals, metallurgy, automobile manufacturing, shipbuilding, air separation, pharmaceutical, food, paper and other industries. Drying compressed air purification technology is a new technology that involves thermodynamics, heat transfer, fluid mechanics, chemical separation, adsorption materials, refrigeration and other disciplines, is very practical technology.
Combined drying compressed air purification equipment
2. System Description
in the purification of compressed air drying equipment, the sensors need to collect inlet and outlet pressure, inlet and outlet temperature of drying compressed air purification equipment to be treated the gas flow rate, dew point temperature (measured by compressed air purification equipment drying treatment, the water content of the target gas), etc., the sensor signals are collected and associated display operating parameters in the display settings, the electrical control and air compressor control system required to achieve chain control and, apart from the communication with the DCS system outside the need to purify compressed air drying equipment, the measured data is passed to the DCS system for DCS system in the remote monitoring. Use Schneider Twido series PLC solve the above sensor signal acquisition and configuration of communication modules and the interface between DCS systems.
Control system is configured to:
Twido PLC TWDLCAA24DRF CPU module, analog module TWDAMI2HT, the temperature module TWDAMI4LT, communication module TWDNAC485T, HMI use XBTN-400 s four lines of display text display.
Combined drying compressed air purification equipment primarily to control the refrigeration compressor and the two main absorption tower.
Of equipments are as follows:
HMI configuration simple, flexible, can be easily monitored on the system parameters and settings, such as:
3. Conclusion
in the use of Schneider Twido PLC and XBTN-400 solution, reduction of a thermostat and pressure switch (traditional usage) and makes the whole control system becomes more flexible and easier operation. Twido PLC programming software such as analog temperature signal to human settings, directly into the amount for the project, avoid another conversion program calculation, thus reducing the programming content, makes the process more intuitive image.