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研究以EDTA为主的化学清洗剂的组分、pH、温度、时间、流量对PWR SG二次侧淤渣主要成分Fe_3O_4溶解量的影响和对材料(低合金钢:S 271、碳钢A3,800合金)在清洗过程中抗腐蚀性能影响。建立了化学清洗试验小回路(30L)。用化学清洗试验小回路进行扩大清洗工艺试验研究。模拟PWR SG二次侧正常运行工况,研究化学清洗剂残余量对材料的抗腐蚀性能影响。结果认为以EDTA为主的化学清洗剂(pH=7,10％EDTA、1％助溶剂、0.25％缓蚀剂A),在93±5℃,8h,112r/min或1.8～2.0t/h清洗过程中,能溶解18～23g/L Fe_3O_4。在整个清洗过程中,材料腐蚀在允许范围内。化学清洗剂残余量低于0.01％EDTA时,不影响材料在PWR SG二次侧正常运行工况(260±5℃)时的抗腐蚀性能。
The effects of chemical components, pH, temperature, time and flux of EDTA-based chemical cleaning agent on the dissolution of Fe 3 O 4, the main component of secondary sludge in PWR SG, 800 alloy) Corrosion resistance in the cleaning process. The establishment of a chemical cleaning test circuit (30L). Using chemical cleaning test small circuit to expand the cleaning process of experimental study. The secondary side of PWR SG was simulated to study the effect of residual amount of chemical cleaning agent on the corrosion resistance of the material. The results show that the EDTA-based chemical cleaning agent (pH = 7, 10% EDTA, 1% cosolvent, 0.25% corrosion inhibitor A) was used at 93 ± 5 ° C, 8h, 112r / min or 1.8-2.0 t / h Cleaning process, can dissolve 18 ~ 23g / L Fe_3O_4. Throughout the cleaning process, material corrosion within the allowable range. Chemical detergent residue less than 0.01% EDTA, does not affect the material in the PWR SG secondary side of the normal operating conditions (260 ± 5 ℃) corrosion resistance.