If the membrane contactor system encounters unexpected events during operation or needs to be stopped during the cleaning cycle, it is necessary to follow a standardized stopping procedure to ensure that the membrane contactor system is well maintained. The specific stopping procedure is as follows:
> Open the bypass circulation line valves for water and acid feed, shut down the acid and water pumps, and close the water and acid feed valves;
> Wait for the inlet water pressure to reduce immobility, open the emptying valve, empty the system of accumulated liquid, (if enough time, can be left to deal with until no water droplets discharged, such as time is not enough, you need to blow directly with compressed air);
> Access tap water at the inlet of the cleaning line after parking, adjust the water volume and clean the system for 20 minutes;
> The acid line is cleaned according to the actual demand, and the cleaning process refers to the waste pipe line;
> Purging the system with degreasing, dry compressed air to regenerate the membrane contactors;
吹掃流程如下:
> 如下圖所示，打開閥門V-101，V-102，關(guān)閉閥門V-201，V-202，通入壓縮空氣，調(diào)節(jié)壓力至4atm，將膜組件的管程吹掃30分鐘；
> 完成膜組件管程吹掃后，打開閥門V-202，關(guān)閉閥門V-102，透膜吹掃2-4h；
> 單根膜組件的吹掃氣量要求為0.5-1m3/h；
> 使用壓縮空氣吹掃后，停止通入壓縮空氣，并通入低壓氮?dú)猓?-2bar），低壓吹掃系統(tǒng)，氮?dú)獯祾呔S持5-10分鐘；
> 氮?dú)獯祾吆螅来侮P(guān)閉系統(tǒng)排空閥、進(jìn)氣閥門和膜接觸器進(jìn)出口閥門，采用惰性氣體充滿系統(tǒng)，是為了阻止細(xì)菌滋長(zhǎng)；
> 停機(jī)后，保持較低的氮?dú)鈮毫Γ?0kPa左右）；
