靳亚鹏,吴芸芳,崔振东,高丽丽,尹建华,王维珍.低温多效海水淡化铝合金换热管的化学清洗[J].表面技术,2019,48(2):200-206.
JIN Ya-peng,WU Yun-fang,CUI Zhen-dong,GAO Li-li,YIN Jian-hua,WANG Wei-zhen.Chemical Cleaning of Aluminium Alloy Heat Exchanger Tube in Low Temperature Multi-effect Seawater Desalination System[J].Surface Technology,2019,48(2):200-206 |
| 低温多效海水淡化铝合金换热管的化学清洗 |
| Chemical Cleaning of Aluminium Alloy Heat Exchanger Tube in Low Temperature Multi-effect Seawater Desalination System |
| 投稿时间：2018-07-17 修订日期：2019-02-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.02.029 |
| 中文关键词: 低温多效海水淡化 铝合金换热管 结垢 化学清洗 氨基磺酸 缓蚀剂 |
| 英文关键词:low temperature multi-effect sea water desalination aluminum alloy heat exchanger tube scaling chemical cleaning sulfamic acid corrosion inhibitor |
| 基金项目:“十三五”国家重点研发计划（2017YFC0404100）；中央级公益性科研院所基本科研业务费专项资金项目（K-JBYWF-2017-G5，K-JBYWF-2017-T04） |
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| Author | Institution |
| JIN Ya-peng | The Institute of Seawater Desalination and Multipurpose Utilization, MNR(Tianjin), Tianjin 300192, China |
| WU Yun-fang | The Institute of Seawater Desalination and Multipurpose Utilization, MNR(Tianjin), Tianjin 300192, China |
| CUI Zhen-dong | The Institute of Seawater Desalination and Multipurpose Utilization, MNR(Tianjin), Tianjin 300192, China |
| GAO Li-li | The Institute of Seawater Desalination and Multipurpose Utilization, MNR(Tianjin), Tianjin 300192, China |
| YIN Jian-hua | The Institute of Seawater Desalination and Multipurpose Utilization, MNR(Tianjin), Tianjin 300192, China |
| WANG Wei-zhen | The Institute of Seawater Desalination and Multipurpose Utilization, MNR(Tianjin), Tianjin 300192, China |
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| The work aims to investigate the chemical cleaning technology of aluminum alloy heat exchanger tube in low temperature multi-effect desalination system and put the technology into field use. The chemical composition of scale on the aluminum alloy heat exchanger tube was analyzed by X-ray fluorescence spectroscopy (XRF). The corrosion rate of 5052 alu-minum alloy in different cleaning agents was tested and the corrosion inhibition efficiency at different concentrations of corrosion inhibitors was evaluated in rotary coupon corrosion simulation test. During the field application, pH, Ca2+, Mg2+ concentration of the system and corrosion rate of aluminum alloy were monitored to control the cleaning process and evaluate the cleaning effect. Main components of heat exchange tube scale were CaCO3 and CaSO4. In the selected cleaning agents, aluminum alloy corrosion rate was the highest in hydrochloric acid and the minimal in citric acid. Sulfamic acid was selected as the aluminum alloy heat exchanger tube cleaning agent because of corrosion and scale removal ability. At 40 ℃, the corrosion rate of aluminum alloy in 4% sulfamic acid without and with 2 g/L HSD103 inhibitor was 1.434 mm/a and 0.084 mm/a respectively, which indicated that the corrosion inhibition efficiency was 94.14%. After that, increasing the corrosion inhibitor concentration did not obviously improve the corrosion inhibition efficiency. In the field, the average corrosion rate of aluminum alloy coupons was 0.146 mm/a and the corrosion inhibition efficiency was 90%. The acid cleaning process ended up after 21 h. After acid cleaning, the pH was stable around 2, the concentration of Ca2+ and Mg2+ did not increase significantly and the scale on aluminum alloy heat exchanger tube was cleaned out. CaCO3 and CaSO4 scale on the aluminum alloy heat exchanger tubes can be effectively removed by sulfamic acid as cleaning agent, and the corrosion inhibitor has obvious protective effect on aluminum alloy so that good cleaning effect is obtained by field application. |
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