The Use of Sequestrants for the Removal of Calcium Salt Deposits from Stainless Steel Surfaces

使用螯合剂去除不锈钢表面的钙盐沉积物

• 批准号: 9905152
• 负责人: Christine Grant
• 金额: $ 17.98万
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-01 至 2003-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9905152&HistoricalAwards=false
• 关键词: Use; Sequestrants; Removal; Calcium; Salt

AbstractCTS-9905152C. Grant, NCSUThis research will investigate the role of mass transfer and surface reactions on the removal of calcium mineral films from stainless steel surfaces using sequestrant solutions in neutral and alkaline environments. Three types of experiments will be used, that range from laboratory to industrial scale: (1) Batch dissolution studies. In these experiments the dissolution of the mineral is investigated by suspending powder particles in the solution. This experiment is not well-characterized from a mass transfer point of view, but it represents the standard study of dissolution kinetics found in the literature. (2) Dissolution from a rotating disk. In this experiment a film of calcium mineral will be deposited on a stainless steel disk. The film will be removed by continuously rotating the disk in the cleaning solution. This experiment has a well-characterized mass transfer rate that is uniform over the whole surface of the film. This will allow us to isolate the role of surface evolution of film morphology during the dissolution process. (3) Dissolution in turbulent pipe flow. Here the cleaning rates under typical conditions will be quantified.

摘要CTS-9905152C。这项研究将调查传质和表面反应在中性和碱性环境中使用隔离剂溶液从不锈钢表面去除钙矿物膜的作用。将使用三种类型的实验，从实验室到工业规模：(1)批量溶出度研究。在这些实验中，通过在溶液中悬浮粉末颗粒来研究矿物的溶解。从传质的角度来看，这个实验的特点不是很好，但它代表了文献中发现的溶解动力学的标准研究。(2)从旋转圆盘中溶解。在这个实验中，将在不锈钢圆盘上沉积一层钙矿物薄膜。通过在清洗液中连续旋转圆盘来去除薄膜。该实验具有良好的传质速率，在整个薄膜表面都是均匀的。这将使我们能够分离出溶解过程中薄膜表面形态演变的作用。(3)湍流管流中的溶解。这里将量化典型条件下的清洗率。