Mixed bed resin

Mixed bed resin is the process of mixing and packing a certain proportion of cation and anion exchange resins into the same exchange device to exchange and remove ions from the fluid. Due to the higher specific gravity of the cation resin compared to the anion resin, the anion resin is on top and the cation resin is on the bottom in the mixed bed. The general ratio of resin filling for yang and yin is 1:2, and there are also filling ratios of 1:1.5, which can be selected according to different resins. Mixed beds are also divided into in vivo synchronous regeneration mixed beds and in vitro regeneration mixed beds. The synchronous regeneration mixed bed operates and the entire regeneration process is carried out inside the mixed bed. During regeneration, the resin does not move out of the equipment, and the cation and anion resins are regenerated simultaneously. Therefore, fewer auxiliary equipment are required and the operation is simple.

The equipment for mixed bed treatment process includes mixed ion exchangers and in vitro regeneration equipment. The in vitro regeneration equipment mainly includes resin separators, anion (cation) resin regenerators, resin storage towers, hybrid resin towers, and acid-base regeneration equipment. The main characteristics of domestic mixed bed treatment technology are reflected in the resin separation and regeneration process.

Regeneration steps of mixed bed resin:

1. There are two ways to operate this system: softening (water treated by the softener) inlet and initial desalination (water treated by reverse osmosis) inlet, which are controlled by their respective control valves.

2. Backwash and close the inlet valve and production valve; Open the backwash inlet valve and backwash discharge valve, and backwash at 10m/h for 15 minutes. Then, close the backwash inlet valve and backwash discharge valve. Let it settle for 5-10 minutes. Open the exhaust valve and middle exhaust valve, partially drain water to about 10cm above the surface of the resin layer, and close the exhaust valve and middle exhaust valve.

3. Regeneration: Open the inlet valve, acid pump, acid inlet valve, and intermediate discharge valve to regenerate the cation resin at 5m/s and 200L/h. Clean the anion resin with reverse osmosis water and maintain the liquid level in the column 10cm above the surface of the resin layer. After regenerating the cation resin for 30 minutes, close the inlet valve, acid pump, and acid inlet valve, open the backwash inlet valve, alkali pump, and alkali inlet valve to regenerate the anion resin at 5m/s and 200L/h. Clean the cation resin with reverse osmosis water and maintain the liquid level in the column 10cm above the surface of the resin layer for 30 minutes.

4. Replace, mix, rinse, turn off the alkali pump and alkali inlet valve, open the inlet valve, and simultaneously inject water up and down to replace and clean the resin. After 30 minutes, close the inlet valve, backwash inlet valve, and intermediate exhaust valve, open the backwash discharge valve, inlet valve, and exhaust valve, and mix the resin for 0.5-5 minutes at a pressure of 0.1-0.15 MPa and an air volume of 2-3m3/(m2 · min). Close the backwash discharge valve and intake valve, and let it settle for 1-2 minutes. Open the inlet valve and the positive wash discharge valve, adjust the exhaust valve, fill the column with water until there is no air, then close the exhaust valve and flush the resin. When the conductivity meets the requirements, open the water production valve, close the positive wash discharge valve, and start water production.

Troubleshooting:

1. Check that all valves of the failed mixed bed are tightly closed.

2. High water level in the regeneration water tank and high liquid level in the mixed bed acid and alkali metering tank.

3. The first level desalination system is operating normally, with sufficient compressed air, and contacting the shift supervisor to prepare for gas supply.

4. Pressure gauges, flow gauges, temperature gauges, etc. are put into normal operation.

Attachment: Mixed bed resin model

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manufacturing industry：Automotive glass, steel, paper, textile, etc

Power industry:Boiler thermal power generation cooling cycle, etc

Catering industry:Beverages, food, dairy industry, drinking water, hotels, etc

Electroplating industry:Coated lighting, cooling, metal plating, LED lights, etc

Optoelectronic industry:Photovoltaic photovoltaic lighting, new energy LED lights, etc

Electronic industry:Electrical chips, circuit boards, microcontrollers, electronic components, etc

Pharmaceutical industry:Medical devices, oral liquids, finished drugs, biologics, etc

Energy industry:Oxide semiconductor silicon material, polycrystalline silicon metal extraction, etc

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