CN103130359A - 软水密闭循环系统的缓蚀阻垢方法 - Google Patents
软水密闭循环系统的缓蚀阻垢方法 Download PDFInfo
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- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
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Abstract
本发明公开了一种软水密闭循环系统的缓蚀阻垢方法，涉及水处理技术领域，它包括以下步骤：A、调节软水密闭循环系统的pH值到8.5-10；B、向步骤A调节后的软水密闭循环系统中投加除氧剂，所述除氧剂的投加浓度为5-30mg/L；C、向步骤B所得的软水密闭循环系统中投加阻垢剂和缓蚀剂，所述阻垢剂的投加浓度为1-100mg/L，所述缓蚀剂的投加浓度为1-20mg/L。本发明对软水进行除氧，在除氧的基础上，根据软水质量，添加极少量阻垢的组分；其无毒环保，即使系统有泄漏，外排水对环境不会造成污染；适应温度较高的软水系统，如高炉软水系统等；成本低廉；缓蚀性能显著提高，优于目前普遍使用的钼-磷系配方。
Description
技术领域
本发明涉及水处理技术领域，尤其是一种软水密闭循环系统的水处理技术。
背景技术
为了节约能源和水资源，对诸如冶金行业的炼铁高炉、炼钢转炉等设备的特殊部位冷却都使用密闭软水循环冷却方式。
随着补充水的加入，软水密闭水系统中被带进大量的溶解氧，在水温较高时，水中溶解氧的去极化作用更为活跃，含氧接近饱和的地方存在氧的浓度差，溶解氧浓度高的地方为电池阴极，发生还原反应；而缺氧区则发生氧化反应，腐蚀加快，严重的部位会发生管道穿孔。
为了防止软水系统中出现结垢腐蚀现象,常在系统中添加一定剂量的阻垢剂和缓蚀剂，来进行水处理。国内已有一些针对软水密闭系统的缓蚀阻垢剂的专利技术。如名称为“连铸软水、炼钢软水系统用缓蚀阻垢剂”（专利公开号：CN1706759，公开日：2005年12月14日），该发明由钼酸盐、有机磷酸盐和共聚物复配而成，组分有钼酸盐、有机磷酸盐、共聚物、去离子水等。又如名称为“钢铁厂结晶器软水系统用缓蚀剂配方及其使用方法”（专利公开号：CN101417839，公开日：2009年4月29日），该发明采用有机膦酸、钼酸盐、磺酸共聚物等。再如名称为“用于软水密闭循环冷却系统的硅系缓蚀剂”（专利公开号：CN1150181，1997年5月21日），该缓蚀剂由硅酸钠、多元共聚、聚丙烯酸钠、羟基乙叉二磷酸、巯基苯并噻唑或苯并三氮唑复合配比而成，适用于软化水或除盐水系统。上述药剂在软水系统应用时，碰到软水系统水温较高时缓蚀性能大多会下降，药剂的使用效果差，造成防腐蚀效能力不足，而且现有的缓蚀剂的投加浓度大、使用成本高，一些药剂中还含有对环境造成污染或对人员可能造成危害的物质(如重铬酸盐、钼酸盐、亚硝酸盐等)。
发明内容
本发明的目的是提供一种软水密闭循环系统的缓蚀阻垢方法，这种缓蚀阻垢方法可以解决水温较高时现有药剂防腐蚀能力差，使用成本高及会产生环境污染的问题。
为了解决上述问题，本发明采用的技术方案是：这种软水密闭循环系统的缓蚀阻垢方法，其特征在于包括以下步骤：
A、调节软水密闭循环系统的pH值到8.5-10；
B、向步骤A调节后的软水密闭循环系统中投加除氧剂，所述除氧剂的投加浓度为5-30mg/L；
C、向步骤B所得的软水密闭循环系统中投加阻垢剂和缓蚀剂，所述阻垢剂的投加浓度为1-100 mg/L，所述缓蚀剂的投加浓度为1-20 mg/L；
所述除氧剂为羟胺类化合物、肟类化合物、异抗坏血酸类、碳酰肼类、氢醌类、醇胺缩合类、亚硫酸钠中的任一种或者是它们的任意组合物；
所述阻垢剂为有机膦酸或者聚丙烯酸钠；
所述缓蚀剂为硼酸盐、苯骈三氮唑、巯基苯骈噻唑、甲基苯骈三氮唑中的任一种或者是它们的任意组合物。
上述软水密闭循环系统的缓蚀阻垢方法的技术方案中，更具体的技术方案还可以是：所述阻垢剂的投加浓度为3-20 mg/L，所述缓蚀剂的投加浓度为3-10 mg/L。
进一步的，所述有机磷酸为水解马来酸酐、丙烯酸与2-丙烯酰胺-2-甲基丙磺酸、多元共聚物、氨基三甲叉膦酸、羟基乙叉二膦酸、乙二胺四甲叉膦酸钠、二乙烯三胺五亚甲基膦酸、2-磷酸基-1，2，4-三羧酸丁烷中的任一种或者是它们的任意组合物。
进一步的，步骤A使用碳酸钠或者碳酸氢钠或者氢氧化钠来调节软水PH值。
本发明针对软水密闭循环系统特点，提供了一种全新的防腐蚀思路，即对工业软水进行除氧（脱氧），在除氧的基础上，根据软水质量（硬度大小），添加极少量阻垢的组分。其中，所述除氧剂可有效地去除软水系统中的溶解氧，防止溶解氧对管道进一步腐蚀；所述阻垢剂可有效起到阻垢作用；所述该组分对不锈钢、铜材质起到有效缓蚀作用。通过上述技术方案，可以大大提高药剂的缓蚀阻垢性能，比单一使用某一剂体的缓蚀阻垢效果明显提高。
由于采用了上述技术方案，本发明与现有技术相比具有如下有益效果：
1、无毒环保，即使系统有泄漏，外排水对环境不会造成污染；
2、适应温度较高的软水系统，如高炉软水系统等；
3、成本低廉；
4、缓蚀性能显著提高，优于目前普遍使用的钼-磷系配方。
具体实施方式
实施例1：
处理的软水密闭循环系统的水质条件为：硬度（以碳酸钙计）为5mg/L，用碳酸钠调节软水pH值为9.0，然后投加甲基肟10mg/L去除溶解氧，再加入羟基乙叉二膦酸5mg/L，加入苯骈三氮唑3mg/L。实施时，可先将苯骈三氮唑用除盐水溶解好。
实施例2：
处理的软水密闭循环系统的水质条件与实施例1相同；用碳酸钠调节软水pH值为8.8，投加碳酰肼5mg/L去除溶解氧，再加入2-磷酸基-1，2，4-三羧酸丁烷3mg/L，加入膦酰基羧酸共聚物5mg/L，加入苯骈三氮唑10mg/L。实施时，可先将苯骈三氮唑用除盐水溶解好。
实施例3：
处理的软水密闭循环系统的水质条件与实施例1相同；用碳酸钠调节软水pH值为8.5，投加二乙基羟胺30mg/L去除溶解氧，再加入聚丙烯酸钠1mg/L，加入硼酸钠4mg/L。实施时，可先将硼酸钠用除盐水溶解好。
实施例4：
处理的软水密闭循环系统的水质条件与实施例1相同；用碳酸钠调节软水pH值为9.5，投加异抗坏血酸10mg/L、氮四取代苯二胺10 mg/L去除溶解氧，再加入水解马来酸酐5mg/L，加入巯基苯骈噻唑2mg/L。实施时，可先将巯基苯骈噻唑用除盐水溶解好。
实施例5：
处理的软水密闭循环系统的水质条件与实施例1相同；用碳酸钠调节软水pH值为9.8，投加烷基醇酰胺5mg/L去除溶解氧，再加入丙烯酸与2-丙烯酰胺-2-甲基丙磺酸50mg/L、氨基三甲叉膦酸50mg/L，加入甲基苯骈三氮唑1mg/L。实施时，可先将甲基苯骈三氮唑用除盐水溶解好。
实施例6：
处理的软水密闭循环系统的水质条件与实施例1相同；用碳酸钠调节软水pH值为10，投加亚硫酸钠30mg/L去除溶解氧，再加入乙二胺四甲叉膦酸钠10mg/L，加入二乙烯三胺五亚甲基膦酸10mg/L，加入苯骈三氮唑20mg/L。实施时，可先将苯骈三氮唑用除盐水溶解好。
实施例7：
处理的软水密闭循环系统的水质条件为：硬度（以碳酸钙计）为30mg/L，用氢氧化钠调节软水pH值为9.0，然后投加甲基肟10mg/L去除溶解氧，再加入羟基乙叉二膦酸5mg/L，加入苯骈三氮唑3mg/L。实施时，可先将苯骈三氮唑用除盐水溶解好。
实施例8：
处理的软水密闭循环系统的水质条件与实施例7相同；用碳酸钠调节软水pH值为8.8，投加碳酰肼5mg/L去除溶解氧，再加入2-磷酸基-1，2，4-三羧酸丁烷30mg/L，加入膦酰基羧酸共聚物5mg/L，加入苯骈三氮唑2mg/L。实施时，可先将苯骈三氮唑用除盐水溶解好。
实施例9：
处理的软水密闭循环系统的水质条件与实施例7相同；用碳酸钠调节软水pH值为8.5，投加二乙基羟胺30mg/L去除溶解氧，再加入丙烯酸与2-丙烯酰胺-2-甲基丙磺酸20mg/L，加入巯基苯骈噻唑5mg/L，加入甲基苯骈三氮唑2mg/L。实施时，可先将巯基苯骈噻唑、甲基苯骈三氮唑用除盐水溶解好。
实施例10：
处理的软水密闭循环系统的水质条件与实施例7相同；用碳酸氢钠调节软水pH值为10，投加碳酰肼5mg/L去除溶解氧，再加入2-磷酸基-1，2，4-三羧酸丁烷3mg/L，加入甲基苯骈三氮唑20mg/L。实施时，可先将甲基苯骈三氮唑用除盐水溶解好。
实际应用正常投加时，各药剂组分投加应以补水量为准，按上述各实施例的浓度加入。
采用静态旋转挂片试验法，分别用实施例1~6处理后的软水对碳钢、不锈钢、黄铜挂片进行腐蚀试验，试验水温50±1℃，转速70转/分，试验时间72小时。试验测定结果见表1。
表1
采用静态旋转挂片试验法，分别用实施例7~10处理后的软水对碳钢、不锈钢、黄铜挂片进行腐蚀试验，试验水温50±1℃，转速70转/分，试验时间72小时。试验测定结果见表2。
表2
从上述试验结果可以看出，本发明使用药剂浓度很小时，就已有很好的缓蚀能力，缓蚀效果明显，无孔蚀现象，其具有高效、剂量低、无污染的优点。
Claims (4)
1.一种软水密闭循环系统的缓蚀阻垢方法，其特征在于包括以下步骤：
A、调节软水密闭循环系统的pH值到8.5-10；
B、向步骤A调节后的软水密闭循环系统中投加除氧剂，所述除氧剂的投加浓度为5-30 mg/L；
C、向步骤B所得的软水密闭循环系统中投加阻垢剂和缓蚀剂，所述阻垢剂的投加浓度为1-100 mg/L，所述缓蚀剂的投加浓度为1-20 mg/L；
所述除氧剂为羟胺类化合物、肟类化合物、异抗坏血酸类、碳酰肼类、氢醌类、醇胺缩合类、亚硫酸钠中的任一种或者是它们的任意组合物；
所述阻垢剂为机膦酸或者聚丙烯酸钠；
所述缓蚀剂为硼酸盐、苯骈三氮唑、巯基苯骈噻唑、甲基苯骈三氮唑中的任一种或者是它们的任意组合物。
2.根据权利要求1所述的软水密闭循环系统的缓蚀阻垢方法，其特征在于：所述阻垢剂的投加浓度为3-20 mg/L，所述缓蚀剂的投加浓度为3-10 mg/L。
3.根据权利要求1或2所述的软水密闭循环系统的缓蚀阻垢方法，其特征在于：所述有机磷酸为水解马来酸酐、丙烯酸与2-丙烯酰胺-2-甲基丙磺酸多元共聚物、氨基三甲叉膦酸、羟基乙叉二膦酸、乙二胺四甲叉膦酸钠、二乙烯三胺五亚甲基膦酸、2-磷酸基-1，2，4-三羧酸丁烷中的任一种或者是它们的任意组合物。
4.根据权利要求3所述的软水密闭循环系统的缓蚀阻垢方法，其特征在于：步骤A使用碳酸钠或者碳酸氢钠或者氢氧化钠来调节软水PH值。
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|---|---|---|---|---|
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5248438A (en) * | 1992-01-28 | 1993-09-28 | Betz Laboratories, Inc. | Methods of controlling scale formation in aqueous systems |
| CN1609019A (zh) * | 2003-10-22 | 2005-04-27 | 北京化工大学 | 工业锅炉防腐阻垢方法 |
| CN102730875A (zh) * | 2011-04-02 | 2012-10-17 | 中国石油化工股份有限公司 | 一种漏油循环水处理方法 |
| CN102765819A (zh) * | 2012-07-19 | 2012-11-07 | 武汉润尔华科技有限公司 | 循环水系统自排水回用工艺 |
-
2013
- 2013-03-21 CN CN2013100902218A patent/CN103130359A/zh active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5248438A (en) * | 1992-01-28 | 1993-09-28 | Betz Laboratories, Inc. | Methods of controlling scale formation in aqueous systems |
| CN1609019A (zh) * | 2003-10-22 | 2005-04-27 | 北京化工大学 | 工业锅炉防腐阻垢方法 |
| CN102730875A (zh) * | 2011-04-02 | 2012-10-17 | 中国石油化工股份有限公司 | 一种漏油循环水处理方法 |
| CN102765819A (zh) * | 2012-07-19 | 2012-11-07 | 武汉润尔华科技有限公司 | 循环水系统自排水回用工艺 |
Cited By (18)
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