سنجش و تعیین مشخصه خوردگی متاثر از عوامل میکروبی در آب چرخه خنک کن نیروگاه شهید مفتح

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه پژوهشی شیمی و فرایند، پژوهشگاه نیرو، تهران، ایران

2 کارشناس آزمایشگاه، گروه پژوهشی شیمی و فرایند، پژوهشگاه نیرو، تهران، ایران

3 کارشناس ارشد، شرکت مادر تخصصی تولید نیروی برق حرارتی، تهران، ایران

چکیده

چکیده
مقدمه: آب چرخه خنک سازی نیروگاه شهید مفتح همدان از تصفیه فاضلاب تأمین می­گردد. لذا کنترل شیمیایی آب به منظور کنترل خوردگی در چرخه اهمیت بالایی دارد.
روش­: نتایج آزمون TBC اب چرخه خنک کن نشان دهنده تعداد تقریبی کلونی باکتری برابر با  cfu/ml103 بوده که در بازه پایین قرار دارد. از سوی دیگر بر اساس نتایج آزمون­ های میکروبی میزان باکتری­های TRB، IRB و APB بسیار بالا و دارای مقادیر cfu/ml 1200، 2300-500 و 105 می باشد. استفاده از آب تصفیه فاضلاب به عنوان تغذیه خنک سازی به دلیل وجود غلظت بالای یون کلسیم منجر به تشدید رسوب­ گذاری و افزایش رشد میکروبی می­گ ردد. همچنین وجود نیترات بالا نیز به دلیل منشاء فاضلاب آب تامین کننده قابل پیش بینی بوده که این مقدار نیترات باعث تشدید باکتری­ های احیا کننده نیترات و نیتریت می­ گردد. از طرفی، وجود فسفات و سولفات بالا در نمونه نیز باعث افزایش رسوب­ گذاری و تشدید رشد میکروبی به ویژه باکتری­ های احیا کننده سولفات در نمونه همراه خواهد بود.
یافته­ ها: در نتیجه غلظت­ های بالای باکتری­ های TRB، IRB و APB در اولویت اول می بایست به صورت انتخاب گزین حذف گردند. در اولویت دوم، یون­ های نیترات و سولفات که خوراک باکتری­ های NRB و SRB می باشند با روش­ های انتخاب گزین حذف یون­ های نیترات با استفاده از رزین­ های تبادل یون و سولفات با روش احیا بیولوژیکی می بایست حذف گردند. با توجه با بالا بودن عوامل میکروبی TRB، IRB و APB و همچنین بالا بودن غلظت خوراک عوامل میکروبی، به عنوان اولویت سوم روش­ های بر پایه زیست کش ­های غیر اکسید کننده در دستور کار قرار می­ گیرد.

کلیدواژه‌ها


عنوان مقاله [English]

Detection and Analysis of Microbial Influenced Corrosion in Cooling Tower of Shahid Mofateh Power Plant

نویسندگان [English]

  • Majid Ghahraman Afshar 1
  • Mohsen Esmaeilpour 1
  • Hossein Ghaseminejad 2
  • Narges Esmaeili 3
1 Assistant Professor, Chemical and Process Engineering Department, Niroo Research Institute, Tehran, Iran
2 . Lab. Technician, Chemical and Process Engineering Department, Niroo Research Institute, Tehran, Iran
3 Senior Expert, Thermal Power Plant Holding Company, Tehran, Iran
چکیده [English]

Abstract
Introduction: The water of cooling tower for Shahid Moftah power plant is supplied from treated wastewater. Therefore, chemical control of water in order to control corrosion in this cycle is very complicated.
Methods: The results of the TBC (total bacteria count) test of cooling tower indicate the approximate number of bacterial colonies equal to 103 cfu/ml, which is in the light range. According to the microbial tests, the amount of TRB, IRB and APB bacteria is very high and has values ​​of 1200, 500-2300 and 105 cfu/ml, respectively. Using treated wastewater as a feed of cooling tower due to the presence of high concentration of calcium ions leads to intensification of sedimentation and increase the growth of microbial organism. Moreover, the presence of high nitrate is predictable due to the origin of water supply, which causes the increase of nitrate and nitrite reducing bacteria (NRB). On the other hand, the presence of high phosphate and sulfate in the sample increase sedimentation and intensify microbial growth, especially sulfate-reducing bacteria (SRB) in the sample.
Findings: As a result, high concentrations of TRB, IRB, and APB bacteria is required to be selectively removed in the first priority. In the second priority, nitrate and sulfate ions, which are food for NRB and SRB bacteria, need to be removed by selective removal of nitrate ions using ion exchange resins and sulfate with biological regeneration method. Due to the high level of microbial agents TRB, IRB and APB as well as the high concentration of microbial agents feed, as the third priority, methods based on non-oxidizing biocides needs to be applied in this power plant.
 

کلیدواژه‌ها [English]

  • Microbial corrosion
  • Shahid Mofateh power plant
  • Corrosion prevention
  • Total bacteria count
  • Corrosion monitoring

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