Design Of Automatic Control System For PTA Air Compressor Unit

PTA (Purified Terephthalic Acid) is short for purified terephthalic acid at normal temperature under the appearance of a white crystal or powder, non-toxic, tasteless, the main raw material for the chemical fiber industry. As matters stand, China has become the largest PTA importing country in the world and the largest consumer. With petrochemical industry development, PTA production has been developed rapidly. High-tech products which PTA is the raw material emerges one after another, and its applications are expanded also. These applications include chemical fiber, light industry, electronics, construction national economy all aspects and they are very closely related to the level of people’s living standards. PTA has been importing to now, the air compressor that products PTA has been importing too. China Petrochemical urgent need for localization of the technology package, the unit localization, their adjustment and Research will fill in the blank.This subject based upon Jiangsu Helen petrochemical 1200,000 tons/year PTA plant and Shenyang blower works supplied air compressor to it; the purpose of the study is that the use of the PTA air compressor localization opportunity to complete the PTA air compressor automation control that reach international level.(1) Introduce the PTA air compressor group developed sense, the development status at d omestic and abroad and Process Description. Re-introduced into the compressor group, do a d eeply study of its composition structure, operating characteristics, and control requirements. B ased upon mastered compressor group performance, combine the the PTA plant process needs , proposed the anticipated requirements of the control system.(2) Elaborated the smart regulation system, the ESD interlock protection system, MMS machinery monitoring systems and intelligent fault fault diagnosis system of hardware, software and networks constitute, described the function of the main components of the device, respectively.(3)Against the anticipated requirements for process control, the entire process from start to stop, detailed about the program for PTA process control of the compressor unit. And detail ed discussion of these two major difficulties topic the antisurge and speed control.(4) Verify the effectiveness of the system through to site commissioning process as well a s the operation, and all related problems has been analyzed.