Based On The PLC And WINCC Sulphur-burning Sulphuric Acid Fan Speed Adjusting System Design PID

The current global economic development process, there are two significant ofinterlacing lines: energy and environment, our country has always been a world sulfuricacid production and consumption power, production has been high in the world.Production of sulfuric acid before most companies is through the pyrite minetransformation to finish, but these enterprise there are generally device as small scale,high energy consumption, and low efficiency of equipment, environmental protectionand economic efficiency is not better many problems, the serious influence theenterprise competitiveness. In recent years, our country in order to conserve naturalresources and control the pollution of the environment, improve work efficiency, andvigorously introduce many large sulfur acid and device, the device is a more advancedtechnology and equipment, the mainest is it saving energy and reducing consumption,and still can improve economic benefit.Although today’s automation, power electronics, microelectronics technology havebeen great progress, but now all kinds of speed regulation system still drag widespreadcertain defects and limitation, namely: most are using ac motor speed eugen vom cleffGMBH not drag adjust air volume way of working. This method is simple, but can’tsave electric energy, cannot achieve the best effect. And the author place unit is a largeenterprise specialized in chemical production, including a set of sulphuric acidproduction plant, before the device is through the pyrite as raw material to finished bytransformation, although the system is simple, but on the environment caused by thegreat influence, not environmental protection, will also. Then, in2008, after thetechnical renovation, the original with pyrite mine as raw material to the old sulfuricacid device to now advanced sulfur acid and device, has greatly improved the workingenvironment. But, the device is through the exchange of the way to change speed notthe size of the air, the method is simple, not very good save electric energy, can notreach the ideal best effect.Therefore, the purpose of this study is to design a for the application of variablefrequency speed change sulfur acid blower rotational speed of the device to achieve economic way to adjust air volume, let fans find suitable power output, achieve thepurpose of saving energy and reducing consumption. In the process, mainly through themonitoring and control WinCC interface, use of PLC system and realize the dataacquisition, process control and communication realization, and frequency conversionto adjust blower rotational speed, to realize the economic to adjust air volume. In thispaper, we determined the system control plan, and to the system principle, design dodetailed exposition and analysis; And then the next place machine design and PCcommunications are introduced, and discusses the PC and Siemens S7-400PLC typeserial communication and the preparation conditions of PLC and PC communicationinterface program principle, etc. Use of PLC free port communication way realizationdata transmission, and then realize the computer and PLC real-time communication, toachieve the purpose of the monitoring system. A discussion on the USS agreement tothe frequency converter for control and program design.