腐蝕在線監(jiān)測技術(shù)在中水為補充水的循環(huán)冷卻水系統(tǒng)中的應(yīng)用

1、第42卷中國電力發(fā)電技術(shù) 收稿日期：2008-09-11；修回日期：2008-12-26中國電力ELECTRIC POWER第42卷第3期2009年3月Vol 42，No3Mar. 2009 第42卷中國電力發(fā)電技術(shù)The application of on-line corrosion monitoring for circulating cooling-water system usingreclaimed water as make up waterZHANG Xiu -li 1，AN Hong -guang 2，LI Chang -zhu 3，LI Yong -li 1（1North

2、China Electric Power Research Institute Co. ，Ltd. ，Beijing 100045，China ；2. Datang International Power Generation Co., Ltd. ，Beijing 100053，China ；3. Datang International Power Generation Co., Ltd. Gaojing Thermal Power Plant ，Beijing 100041，China ）Abstract:The operating principle, structure and app

3、lication of an on-line corrosion monitoring system were introduced for the circulating water system using reclaimed water as make up water. The advanced electrochemical measuring equipment was used to check the monitoring system and the accurate and reliable results were obtained. Considering the th

4、ree-electrode system of same material used in such system, the linear polarization technology was introduced to measure the instantaneous corrosion rate and polarization resistance of copper and carbon steel. The on-site application shows that the on-line corrosion monitoring system is practicable f

5、or the inhibitor adding operation and the on-line corrosion monitoring is of the same importance for carbon steel and copper material in the circulating water system using reclaimed water as make up water.thermal power plant ；on-line corrosion monitoring ；corrosion electrochemical measuring ；circula

6、ting water ；reclaimed water蝕作用，但通過調(diào)整緩蝕劑的加藥量可將碳鋼的腐蝕速率控制在設(shè)計規(guī)范允許的范圍內(nèi)。由圖8可看出，在前500h ，銅電極的極化電阻和腐蝕速率波動較大，這是由于銅電極在加有緩蝕劑的循環(huán)水中腐蝕速率很小，其表面狀態(tài)的穩(wěn)定需要一定時間；500h 以后，測量數(shù)據(jù)的變化比較平穩(wěn)，年腐蝕速率由0.004mm/a逐漸下降至0.001mm/a。圖8的測量結(jié)果表明循環(huán)水系統(tǒng)中銅的腐蝕速率一直控制在設(shè)計規(guī)范允許的范圍內(nèi)。3結(jié)語應(yīng)用線性極化技術(shù)設(shè)計的循環(huán)水腐蝕在線監(jiān)測系統(tǒng)，可給出循環(huán)水系統(tǒng)中銅材質(zhì)、碳鋼材質(zhì)的極化電阻和年腐蝕速率，監(jiān)測系統(tǒng)測量數(shù)據(jù)真實可靠。通過腐蝕在線

7、監(jiān)測可指導(dǎo)循環(huán)水的投加緩蝕劑處理，保證銅和碳鋼材質(zhì)的腐蝕速率均控制在設(shè)計規(guī)范允許的范圍內(nèi)。在補充水為普通水的循環(huán)水系統(tǒng)中，由于凝汽器銅管的腐蝕問題較突出，腐蝕檢測重點放在銅材質(zhì)上。在采用中水作為補充水的循環(huán)冷卻水系統(tǒng)中，碳鋼的腐蝕問題也很突出，因此，碳鋼的腐蝕監(jiān)測與銅材質(zhì)的腐蝕監(jiān)測一樣重要。參考文獻(xiàn)：1周本省. 工業(yè)冷卻水系統(tǒng)中金屬的腐蝕與防護(hù)M . 北京：化學(xué)工業(yè)出版社, 1993.ZHOU Ben -xing Metal corrosion and protection for industry cooling-water system M . Beijing ：Chemical Indu

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9、）：72-74DENG Yu -qiang ，CAO Jie -yu ，SONG Jing -xia ，et al . Application of on-line corrosion monitoring technology on condenser tubes in ther -mal power plants J Electric Power ，2006，39（5）：72-744范國義，曾為民，馬玉錄循環(huán)冷卻水腐蝕在線監(jiān)測系統(tǒng)的研究與應(yīng)用J 化工裝備技術(shù)，2006，27（4）：49-51FAN Guo -yi ，ZENG Wei -min ，MA Yu -lu Study and ap

10、plication of an on-line corrosion monitoring system of circulating cooling water J Chemical Equipment Technology ，2006，27（4）：49-515張秀麗，安洪光，謝生源，等循環(huán)冷卻水系統(tǒng)中腐蝕在線監(jiān)測裝置的開發(fā)與應(yīng)用J 中國電力，2003，36（3）：24-26ZHANG Xiu -li ，AN Hong -guang ，XIE Sheng -yuan, et al . Development and application of an on-line corrosion monitor in circulating cooling-water system J . Electric Power ，2003，36（3）：24-266曹楚南. 腐蝕電化學(xué)M . 北京：化學(xué)工業(yè)出版社, 1994.CAO Chu -nan. Corr