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用海水冷却的滨海电站和用污染淡水冷却的电站都存在铜合金冷凝器的严重腐蚀问题,诸如点蚀、砂蚀、缝隙腐蚀和应力腐蚀等。钛的比强度高、有良好的机械性能和优异的耐海水腐蚀性能。在静止或高速流动的海水中腐蚀速度极小,在常温海水中不发生点蚀或缝隙腐蚀。在120℃以上有可能产生点蚀或缝隙腐蚀,发生应力腐蚀的敏感性与其成份、结构和缺陷有关。表面有铁颗粒沾污时易导致吸氢和氢脆。钛管壁具有滴状冷凝特性,耐冲刷,不易结垢,可采用较高水流速度,其综合传热性能可与铜合金管相比。由于节省了一些附属设备,全钛冷凝器的制造成本与铜镍合金管冷凝器相差不大,有广阔的应用前景。
There are serious corrosion problems with copper alloy condensers, such as pitting corrosion, sand erosion, crevice corrosion and stress corrosion, both of which are cooled by sea water and those cooled by contaminated fresh water. Titanium high specific strength, good mechanical properties and excellent resistance to seawater corrosion. Corrosion rate is extremely low in still or high-speed seawater, and pitting or crevice corrosion does not occur in seawater at normal temperature. Pitting or crevice corrosion is likely to occur above 120 ° C. The susceptibility to stress corrosion depends on its composition, structure, and defects. Iron particles surface contamination easily lead to hydrogen absorption and hydrogen embrittlement. Titanium tube wall with a drop of condensing properties, resistance to erosion, scaling is not easy, you can use a higher water flow rate, the overall heat transfer performance can be compared with the copper alloy tube. As a result of saving a number of ancillary equipment, all-titanium condenser manufacturing costs and copper-nickel alloy tube condenser or less, have broad application prospects.