Destillatsiooniseadme automaatikasüsteemi uuendamine Viru Keemia Grupi näitel

Lõputöö käigus oli koostatud ja programmeeritud uus riistvara destillatsiooni seadmele, mis asub Viru Keemia Grupi territooriumil Kohtla-Järve linnas. Samuti olid tehtud muudatused SCADA süsteemile uue riistvaraga korrektseks tööks. Programmeerimine ja visualiseerimine toimus ühes programmis, TIA Portal’is versiooniga 18. Püstitatud eesmärgid olid saavutatud ja pärast testimist probleemid ei ilmunud. Eesmärkide hulgas oli: • Uue riistvara valik • Programmi koostamine olemasolu programmi baasil • Programmi osa ümber organiseerimine ja lihtsustamine • SCADA süsteemi seadistamine Lõputöös anti ka teoreetilised baasteadmisi kontrollerite kohta, näiteks protokollidest ja programmi koostamisest. Testiks kasutati PLCSim tarkvara, mis on samuti Siemens’i poolt loodud kontrolleri simulatsioon. Lõppkatseks kasutati päris kontrollerit, selle abil katsetati programmi ja kontrollerit nö “laua peal”. Selle testi tulemuseks oli stabiilne ja korralik töö. Uuendatud kontrolleri eeliseks vanaga võrreldes on laiendatud arvutusjõudlus, mis toob kaasa ka suurema funktsionaalsust ja stabiilsust. Lisaks annab selle kontrolleri kasutamine rohkem võimalusi terve süsteemi tulevikus moderniseerimiseks. Lõputöö kirjutamise ajal ei lähe koostatud süsteem tööle, kuna selleks on vaja oodata destillatsioonseadme seismapanekut. Eeldatavasti pannakse uus süsteem kokku suve alguses, pärast seda läheb uuendatud kontroller tööle.

The topic of this Bachelor’s Thesis is Distillation Plant´s Automation System Upgrade on the Example of Viru Keemia Grupp. At the moment there are 5 Programmable logic controllers, or PLCs, 2 of which already have been replaced with new ones. The main point of replacing the PLCs is that old ones no longer meet all the requirements and cannot work as intended anymore. The PLC described in this thesis is responsible for control of Fraction cooling process. It is an outdated Siemens S7-300 series controller, which has been working there from the year of 2008 and is in need of replacement. The problem with it is periodical selfshutdown, connection disruption and out of date software with chaotically written code. In addition to problems mentioned above, new PLC is capable of future improvements of entire plant’s system, such as new communication protocols with frequency inverters and providing more opportunities for extra modules and systems added to it. For such task was chosen a newer Siemens S7-1500 PLC, these PLCs have shown great results in Viru Keemia Grupp before, so it is a good choice for this plant as well. During the work on this project new programme was created. In this programme, problems occurred in the previous version were eliminated, such as unorganized code, written mostly using Russian comments, which made it barely readable for non-Russian speakers. In the new version author uses English comments, with code organized in logical order into folders for better navigation inside the programme. In addition to that, programme was made with the use of functions, which also simplified the programme, meaning that a potential user does not need to know or understand the entire code, only the necessary segment, which became easier to find and make changes. Finished programme passed a few tests using simulation software and a real PLC. Tested programme works well and ready for further integration into plant’s environment. This project will be implemented in early summer of 2024. It is not possible to install and launch the system right now due to need to halt the entire plant to do that.