采用有机膦羧酸控制换流阀冷却水系统结垢

防止换流阀冷却水系统结垢的方法有：大量排污换水：对补水进行除盐或软化；加入一定的化学物质。本文介绍了在葛洲坝换流站使用化学物质2－膦酸丁基－1，2，4三羧酸（PBTC）减少冷却水系统结垢的一些成功经验。在实验室进行的阻垢和腐蚀试验确定PBTC的使用浓度为2－3mg/L，现场试验证实热交换器结垢得到了控制，PBTC的阻垢效果令人满意，冷却水系统未发生腐蚀，保证了换流阀的安全正常运行。

Scale Inhibition by Phosphonate Cooling Water System of Converter Valve

There are several ways to inhibit scale:a large flow blow down,softening the make-up wa- ter,adding some chemical. A successful experience for treating the cooling water with the chemical, 2- phospono-1, 2,4-tricarboxylic acid(PBTC),in Gezhouba HVDC Converter Station was introduced. The experiment of scale inhibition and corrosion in laboratory determined that the density of PBTC is 2- 3mg/l. The test in site verified that the scale in heat-exchange apparatus had been controlled and the scale inhibition with PBTC was satisfactory. The corrosion no longer occurs throughout the cooling water system.