On The Application Of PLC In The Produce System Of Coal Water Powder

Coal water mixture is a new coal based liquid fuel and also called a flowing coal. The coal water mixture is consisted of 65～70 % of coal particles,29～34 % of water and less than 1 % of chemical with a certain technical preparation. It has similar feature with fuel oil and can substitute to fuel oil in several utilizations CWM enables easier handling,like heavy oil,with convenience in storage,transportation and combustion, which is similar to the oil combustion efficiency rate.It can be transmitted through pumps and burned with atomization similar to the fuel. Coal water powder is the betterment of coal water mixture.They have the same characteristics,moreover,coal water powder is more convenient,more environmentally friendly,less affected by temperature.The dissertation introduces the produce process of coal water powder. The application of plc to the control in the produce process of coal water powder is described in detail in this paper. The construction,the integration function and the design process of the system are analyzed. Based on the analysis of the control process and realization process,a clear flow by the plc control program is illustrated,especially the control in the mix process of water and coal. Moreover it introduces a control method based on digital PID control strategy in the system of mix.The plc control system is proved to be simple, economic and reliable by practice. The output is eligible.Through an instance participated by author in the reality,the article gave a systemic explanation on the research and application of the Produce System of Coal Water Powder. The content including:the first, this paper introduces the meaning of the subjects and summarizes coal water slurry, coal ash, the technology of coal ash and the process and specialty of produce. The second, based on the introduction of the configuration software technology,PLC technology and AC frequency conversion for speed adjustment technology, through the research and analysis, this system adjusts general transducer Mitsubishi FR-A540 to control the speed of motor, consequently actualizes the full use of energy and the need of production. Based on S7-300 PLC's programming software STEP 7, which adopts the modularization method in programming design,can reduce the software exploitation and maintenance. The third,Come true of the advanced control of switch and simulator through programmatic applying,and based on the analysis of PID arithmetic,a system is designed by making use of PID control strategy and achieves needed precision. The fourth, to the possible failure at work, failure pretreatment measure is provided with user at last.