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In addition to the research and application of ceramic membrane technology for oil
作者:Steven 发布于:2011/5/13 14:10:59 点击量:

In recent years, along with the coking plant size increases, the residual ammonia water quantity is increasing, the tar and ammonia in an urgent problem. The previous several degreasing methods have some problems, such as sand filter blockage, static except oil removal efficiency, low tar flotation device investment is too high and FJL fluidics air floating deoiling complicated oil method. The ceramic membrane degreasing technology are introduced.

From the mechanical clarification tank to ammonia water flows into the residual ammonia flume, the pump to the spiral plate heat exchanger and then to the ceramic membrane filtration to remove the oil separator, the residual ammonia water to the distilled ammonia tank, oil is discharged from the top of the separator, heavy oil discharged from the bottom. In the residual ammonia water outlet for steam and water backwashing.

(2) in comparison with the static oil ceramic membrane in oil. Static oil removal is the residual ammonia water in tanks of large volume, oil drops by gravity sinking. The static deoiling method can remove the oil droplets larger diameter, oil removal efficiency under 50%. Ceramic membrane oil removal in the first filter stage, rely on the huge micropores and strong surface energy, the solid particles in solid-liquid two-phase trapped or adsorbed on the surface. When the filter after a period of time, outside the ceramic film forming filter cake, the cake has become the main media filtration. Table 1 Comparison of static except oil and oil removal efficiency of ceramic membrane, the ceramic membrane degreasing, efficiency is increased from 40% to 70%

(3) compared the tar flotation device and ceramic membrane in oil. I plant in order to completely solve the problem of surplus ammonia water with oil, used tar flotation device instead of sand filter processing surplus ammonia water, and achieved good results. But with tar flotation device except oil investment is too high, figure 3 is the comparison of investment tar flotation device and ceramic membrane separator oil, oil removal volume per increase in 10M3 / h, tar flotation device investment than ceramic membrane separator high investment more than 100000 yuan.

(4) FJL radiation compared air floating machine and ceramic membrane in oil. Jet flotation oil removal operation is troublesome, because of the need of adding flotation agent and coagulant in wastewater, the diameter of 0.25 ~ 25 μ M emulsifying oil and suspended particles in micro bubbles, and bubbles float to the surface with oil for oil water separation. In addition, oil poured into the flotation machine makes it easy for aerator blockage, and therefore often remove aerator for cleaning. In order to further improve the oil removal efficiency, but also need to add flocculants, such as PAM (polyacrylamide) and polymerization iron reagent. Ceramic membrane separator oil can save a lot of trouble, only periodic backwashing for steam and water. Ceramic membrane separator in the use process, with a micropore filling internal gradually blocked, gradually thickening and filling out the cake, ammonia import and export pressure will gradually increase, while more than 1kPA, will require backwashing with steam and water

The backwashing time to close the inlet and outlet valve of the ammonia separator, the oil valve is closed, the bottom heavy oil valve open, open the backwashing of steam and water to wash, when the difference is less than 0.2kPA import and export pressure separator of ammonia, show that flushing is completed, can be re opened ceramic membrane separator.

 

 

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