NHD脱碳液石英砂过滤工艺

采用石英砂过滤对NHD脱碳液进行了净化处理，研究了石英砂粒径、床层高度、过滤速度及操作压力等因素对固体杂质去除率的影响。确定了石英砂过滤方法处理NHD脱碳液的适宜条件，同时确定了砂床反冲洗方式及其强度。实验结果表明：在室温，石英砂粒径范围0.60～0.80 mm、床层高度600 mm、操作压力为0.03 MPa以及滤速为8.1 m/h的条件下，NHD脱碳液经石英砂过滤净化处理后，固体杂质去除率可达89.8%以上，且处理后的NHD脱碳液的吸收性能未变。

Quartz sand filtration of NHD solution

Quartz sand filtration was used for purifying the NHD (a decarburizing/desulfurizing reagent mainly consisting of polyethylene glycol dimethyl ether，developed by Nanjing Chemical Industry Company). The operating conditions，including operating pressure，filtration rate，quartz sand particle size，sand bed thickness were studied. The suitable conditions of quartz sand filtration using for purifying the NHD decarburizing/desulfurizing solution were studied，and sand-bed backwashing method and its intensity were determined. The experimental results showed that at room temperature，quartz sand particle size 0.60～0.80 mm，sand bed thickness 600 mm，operating pressure 0.03 MPa，filtration rate 8.1 m/h，after purification treatment of NHD solution with sand as filtration material，the solid impurities removal was up to 89.8%，and the absorption property of NHD solution remained unchanged.