CNG Processing Equipment Very Obvious
Reverse osmosis (RO) is a very effective membrane separation unit operation, is relying on reverse osmosis membrane under pressure in the solution of solvent and solute separation process. Reverse osmosis technology can reduce the load of ion exchange resin by more than 90%. CNG Processing Equipment The amount of regenerant used in resin can also be reduced by 90%. In addition to salt removal, it can remove the particles, organic matter and colloidal substances in the water and reduce the pollution of ion exchange resin , To extend the service life has a good effect.
However, for a long time, reverse osmosis technology seems to be powerless for the removal of free CO2 contained in water because conventional reverse osmosis techniques must control the LSI (ie, CNG Processing Equipment Langley's saturation index) in the influent to prevent reverse osmosis membrane fouling The The LSI value of an important parameter is the PH value of the influent, if the PH value is acidic, it is not easy to scale, if the pH is alkaline, the fouling tendency is very obvious. Therefore, the traditional process in the reverse osmosis system before adding HCl solution, can well prevent CaCO3, MgCO3 and other precipitates fouling; CNG Processing Equipment and rarely in the reverse osmosis system before adding NaOH solution.
At present, the most widely used is the carbon dioxide degassing tower. Since the water contains a large amount of bicarbonate alkalinity, after the H-type ion exchanger (ie, cation exchange bed), the resin is replaced with H to be replaced with water to become carbonic acid , So the CO2 bed is generally placed behind the cation exchange bed, CNG Processing Equipment in front of the anion exchange bed.
Vacuum degassing tower is also a way to remove CO2, in addition to the removal of O2 and other substances in the water, removal efficiency than the removal of high CO2 tower. CNG Processing Equipment It works by using a device to spray the water from the next, after the filter material dispersed, the water CO2 and O2 escape, while the vacuum pump in the middle of the tower vacuum, CO2 and O2 by the vacuum pump suction, degassing After the pure water flow to the bottom of the tower, the mixed bed after the pump pressure into the post-treatment mixed bed. If the vacuum degassing column is weakly acidic, the carbonate in the water can also be removed in large quantities, because when the pH of the water is less than 4.3, the carbonic acid in the water is almost completely in the form of carbon dioxide, due to the non-degassing reverse osmosis Water is generally weak acid, CNG Processing Equipment so the vacuum degassing tower is generally placed in the post-reverse osmosis.
Vacuum degassing tower structure is more complex, large units have degassing tower, vacuum pump, etc., in order to ensure uniform dispersion of the water, the filter layer height must be set very high, resulting in degassing tower height of ten meters, the equipment occupies a huge space, In addition, because the degassing tower level control is very strict, the liquid level is too high, CNG Processing Equipment easy to degassing efficiency, too low, easily lead to pump suction, causing production accidents, so the use of the level gauge must be very sensitive. CNG Processing Equipment Although the vacuum degassing tower will not bring new impurities into the outside world, but because of the complex structure of the equipment, large footprint, high operating costs, so the actual production and application subject to certain restrictions.