Technical terms and definitions of automatic control sodium ion exchanger

Design requirements

Requirements for the complete switch

  1. The design of the exchanger for industrial water softening treatment shall meet the requirements of GB/T 50109. The design documents of the exchanger shall at least include design drawings, process design calculations, strength calculations and installation instructions. The design unit shall be responsible for the correctness and completeness of the design documents.
  2. The design pressure of the exchanger should not be less than 0.6MPa.
  3. The height of the ion exchange resin layer in the exchanger should be determined according to the operating cycle, raw water quality and effluent water quality requirements. The fixed bed ion exchange resin layer height used for the soft water treatment of industrial equipment shall not be less than 800mm; the floating bed ion exchange resin layer height shall not be less than 1200mm.
  4. The co-current regeneration and counter-current regeneration fixed bed ion exchanger should have a backwash expansion height of 40%-50% of the resin height; the floating bed should have a water cushion of 100-200mm.
  5. The upper and lower water distributors should be installed in the exchange tank, and the water distribution should be uniform and no partial flow.
  6. The controller and exchange tank should be reasonably selected according to the raw water quality. Under the conditions of meeting the performance indicators and rated water output in Table 4, ensure that the operating cycle of the exchanger is not less than the exchange capacity of the accumulated 12h water supply. If the shortest interval between automatic regeneration of the time-type exchanger is once a day, it should not be less than the exchange capacity of 24h water supply.
  7. No hard water should flow out of the outlet of the exchanger during the regeneration process.
  8. Under normal operating conditions, the main technical performance indicators of the exchanger shall meet the requirements specified in Table 4. The main performance indicators of the exchanger are required to connect to the system. Operating flow rate m/h Backwash flow rate m/h Regeneration flow rate m/h Forward washing flow rate m/h Regeneration solution concentration a% Salt consumption g/mol Regeneration self-consumption rate m 3/ m 3(R) Primary sodium downstream regeneration 15~30 10~20 4~6 15~20 6~10 <130 <12 Counter current regeneration 15~30 10~20 2~4 15~20 5~8 <100 <10b Floating bed 20~60 — 2~6 20~50 5~8 <100 <8c Secondary sodium ≤60 10~20 4~6 15~20 5~8 — <10 Note: Exchanger used for soft water treatment of industrial equipment The regeneration time should generally be no less than 30 minutes. a The concentration of regenerant refers to the concentration of brine that enters the ion exchange resin layer after passing through the jet at room temperature. b This value is the average regeneration water consumption rate. c Does not include water consumption for external cleaning.

Salt Liquid System

  1. The salt tank should be resistant to corrosion by sodium chloride or take anti-corrosion measures.
  2. The salt solution tank should be covered, and its effective volume should be within the specified salt solution concentration range, at least to meet the one-time regeneration amount of a sodium ion exchanger, and to facilitate the salting operation.
  3. The salt tank must have a good filtering device with a salt barrier inside, so that the concentration of the salt solution under the salt barrier can reach saturation evenly under normal salt addition.
  4. The salt liquid system should be equipped with an air check valve.
  5. Industrial sodium chloride for regeneration should meet the requirements of GB5462.

Controller

  1. The controller should be able to work normally within the working pressure range of 0.2~0.6MPa, the liquid phase transposition should be accurate, and there should be no leakage and channeling.
  2. For the controller with a voltage exceeding 36V, the dielectric strength of the live circuit to the controller housing should be able to withstand AC 1500V voltage without breakdown or flicker for 5 minutes; the insulation resistance of the live circuit to the controller housing Should not be less than 5MΩ. The controller shell must have a good grounding protection device.
  3. The controller should have the function of manually starting the regeneration process.

The use conditions of the exchanger The use conditions of the exchanger should meet the regulations. The use conditions of the exchanger project requirements working conditions working pressure 0.2MPa~0.6MPa water inlet temperature 5℃~50℃ working environment ambient temperature 5℃~50℃ relative humidity ≤95% (at 25℃) Applicable power supply AC 220V±22V/ 50Hz or 380V±38V/50Hz Influent water quality turbidity downstream regeneration<5FTU; countercurrent regeneration<2FTU free chlorine ≤0.3mg/L iron content<0.3mg/L oxygen consumption (CODMn) <2mg/L(O2)

  1. The controller should be able to work normally within the working pressure range of 0.2~0.6MPa, the liquid phase transposition should be accurate, and there should be no leakage and channeling.
  2. For the controller with a voltage exceeding 36V, the dielectric strength of the live circuit to the controller housing should be able to withstand AC 1500V voltage without breakdown or flicker for 5 minutes; the insulation resistance of the live circuit to the controller housing Should not be less than 5MΩ. The controller shell must have a good grounding protection device.
  3. The controller should have the function of manually starting the regeneration process.

Material

  1. The various materials used in the manufacture of the switch shall conform to the national standards or industry standards of the corresponding materials, and there shall be material quality certification documents.
  2. All materials in the product that are in direct contact with water, under the conditions of use specified in this standard, should not cause water pollution.
  3. All purchased parts should meet the corresponding national standards or industry standards, and have the quality certificate of the manufacturer.

Manufacturing

  1. The geometric dimensions and appearance quality of the exchange tank should conform to the design drawings and technical documents. Steel tanks should also meet the requirements of JB/T2932.
  2. The inner surface of the exchange tank made of carbon steel should have anti-corrosion coating or lining, and should comply with the relevant regulations in JB/T2392.
  3. The exchange tank made of stainless steel refers to the relevant regulations in JB/T2932, and the outer surface should be pickled and passivated. The inner surface of the tank made of materials sensitive to chloride ions should have an anticorrosive coating or lining.
  4. The inner surface of the FRP tank should be flat and smooth. The tank body should not contain cracks, delamination, pinholes, impurities, poor glue areas and bubbles that affect the performance. The opening plane should be perpendicular to the axis. No burrs and other obvious defects. Barcol hardness of the tank surface: unsaturated polyester resin not less than 36; epoxy resin not less than 50.

Assembly

  1. All parts and components should be inspected and qualified, and there should be no rough burrs or sharp burrs and other hazards, and they can be assembled after washing.
  2.  The assembly of the whole machine should conform to the drawing regulations, and the piping system should be straight, neat and beautiful. All connecting pipelines should be sealed without leakage.
  3. The cation exchange resin filled in the exchanger should meet the requirements of GB/T 13659 and other corresponding standards.
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