| 摘要: |
| 介绍了中国神华公司某激冷气装置的三通及直管段的腐蚀情况，对首次及修补后的腐蚀位置及形貌进行了观察；分析了该装置的工艺及内部的介质材料和外部管子管件的材料及参数；通过对被腐蚀区域进行光谱、显微金相和能谱分析，对腐蚀原因进行了分析总结。研究表明，冷热两股流体在三通管处垂直交汇混合，在三通管脖颈上方处，管道壁面也会产生较大的温度梯度，由于存在液相水，介质中的CO2溶解到水中会形成碳酸腐蚀；合成气中所含的酸性物质电离，发生了电化学腐蚀。通过更换材料，提供伴热以及增加巡查及加强管理等各项技术及管理措施，能有效减缓了腐蚀速率，降低不均匀腐蚀的发生概率。 |
| 关键词: 煤制氢 三通 腐蚀 |
| DOI： |
| 分类号: |
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| Corrosion Analysis of Triplet on Gas Quench Device Producing Hydrogen from Coal |
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LIN Hui， XU Wei-pu， YUAN Yi-wen1,2
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1. Engineering Management Department,China Shenhua Coal to Liquid and Chemical Beijing Engineering Company, Beijing 100011;2. Shanghai Institute of Special Equipment Inspection and Technical Station, Shanghai 200333
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| Abstract: |
| The corrosion situation of a gas quench device on the triplet and straight pipe produced by China Shenhua Co. was presented. The positions and morphologies of the initial and the afterrepairing corrosion were observed. The internal medium, component materials and parameters of the external pipe fitting were also described. The reasons of corrosion were summarized by analysing the corrosive area using light spectrum, metallographic microscopy and energy spectrum. The results show that the hot and cold fluids meet vertically on triplet pipe, resulting in large temperature gradient around the inner wall of pipe. Due to the water, carbon dioxide gas is dissociated to form carbonic acid, which causes of corrosion by ionization. Some management and technological measures are adopted to slow down and reduce the corrosion rate, such as replacing materials, providing heat tracing, enhancing inspection and reinforcing management. |
| Key words: hydrogen from coal triplet corrosion |
