نشریه علمی فرآیند نو

نشریه علمی فرآیند نو

پایش پارامترهای فیزیکوشیمیایی و بررسی علل تخریب سیکل بخار نیروگاه حرارتی

نوع مقاله : پژوهشی

نویسندگان
1 گروه پژوهشی شیمی و فرآیند، پژوهشگاه نیرو، تهران، ایران
2 گروه شیمی، دانشکده علوم، دانشگاه گلستان، گرگان، ایران
چکیده
در این پژوهش پارامترهای مؤثر در سیکل آب و بخار نیروگاه حرارتی از جمله آب تغذیه، بلودان، بخار اشباع و کندانسور بررسی و ارزیابی می گردد. سپس با توجه به آنالیز XRD و XRF رسوبات حاصل از بلودان و رسوبات داخلی بویلر نوع خوردگی­های حادث شده در این نیروگاه بررسی گردید. بر اساس آزمونهای انجام شده pH، TDS و هدایت الکتریکی کل نمونه بخار اشباع به ترتیب در حدود 9، ppm 3.66 و µS/cm 5 می باشد. نتایج این بررسی ­ها نشان دهنده بالا بودن میزان اکسیژن است که منجر به ایجاد خوردگی حفره ­ای، جدایش لایه محافظ مگنتیت و در نتیجه اورهیت شدن لوله ­ها به دلیل تجمع رسوبات در لوله­ ها می­ شود. همچنین آنالیزهای XRD و XRF رسوبات داخلی بویلر و رسوبات موجود در بلودان نشان از وجود فاز هماتیت دارد که مؤید حضور اکسیژن مازاد و تبدیل لایه پوششی مگنتیت به هماتیت و جدایش آن از سطح خواهد شد. به منظور جلوگیری از اورهیت شدن لوله ­های واتروال استفاده از سوخت­های جایگزین مناسب، بهبود رژیم شیمیایی آب گردشی، بهبود کیفیت سوخت و اسیدشویی دوره­ای و منظم پیشنهاد می­شود.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Monitoring the Physicochemical Parameter and Investigating the Causes of Destruction for Thermal Power Plant Steam Cycle

نویسندگان English

Mohsen Esmaeilpour 1
Majid Ghahraman Afshar 1
Abbas Yousefpour 1
Milad Kazemnejadi 2
Hossein Ghaseminejad 1
1 Chemistry and Process Research Department, Niroo Research Institute (NRI), Tehran, Iran
2 Chemistry Department, Faculty of Sciences, Golestan University, Gorgan, Iran
چکیده English

In this study, the effective parameters in the water-steam cycle of a thermal power plant including feed water, blowdown, saturated steam, and condenser are investigated. According to the XRD and XRF analysis of the deposits from the blowdown and the internal deposits of the boiler, the type of corrosion that occurred in this power plant are investigated. Based on the performed experiments, the pH, TDS, and electrical conductivity of the saturated steam ater are about 9, 3.66 ppm, and 5 µS/cm, respectively. The results of these studies indicate that the oxygen content is high which leads to pitting corrosion and separation of the magnetite protective layer. As a result, overheating of the pipes ahappen due to the accumulation of deposits in the pipes. Moreover, the XRD and XRF analyses of the internal deposits of the boiler and the deposits in the blowdown indicate the presence of hematite phase which confirms the presence of excess oxygen and the conversion of the magnetite coating layer to hematite and its separation from the surface. In order to prevent overheating of waterwall pipes, it is recommended to use appropriate alternative fuels, improve the chemical regime of the circulating water, improve fuel quality, and conduct periodic and regular acid washing.

کلیدواژه‌ها English

Thermal Power Plant
Physicochemical Parameters
Boiler
Blowdown
Corrosion
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