Improved mixed bed regeneration method
By optimizing the steps and parameters of mixing bed regeneration, the problem of cumbersome and time-consuming regeneration of mixed bed resin in the prior art is solved, and water consumption, time and chemicals are saved, working efficiency is improved and production costs are reduced.
Patent Information
- Application Number
- CN202510450277.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-11
- Publication Date
- 2025-05-30
AI Technical Summary
During the regeneration process of existing mixed bed resin, the steps are complicated, the time is required, and the water consumption and the dosage are large, resulting in low efficiency and high cost.
By optimizing the steps of mixing bed regeneration, including layering, reduction, resin mixing and rinsing, reducing the failure of the sprinkler, adjusting the flow rate and concentration of the alkali and acid, and controlling the regeneration time and pH value to achieve more efficient resin regeneration.
It greatly saves water, time and chemicals for mixed bed regeneration, improves work efficiency, reduces production costs, and is also beneficial to energy conservation and emission reduction.
Smart Images
Figure CN120054661A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of water treatment, and particularly relates to a method for improving the regeneration of a mixed bed. Background Art
[0002] In the process of preparing demineralized water used in boilers, the resin regeneration of the mixed bed is carried out by hydrochloric acid and sodium hydroxide solutions. Generally, for the regeneration of the mixed bed resin, most enterprises, on-site technicians, and professional technology manufacturers recommend using the method of making the resin ineffective by alkali showering to make the cation resin ineffective to improve the layering effect, and first carry out the regeneration of the anion resin, and then carry out the regeneration of the cation resin. The steps are cumbersome and the required time is long. Summary of the Invention
[0003] The purpose of the present invention is to solve the above technical problems and provide a method for improving the regeneration of a mixed bed.
[0004] To solve the above technical problems, the technical solution adopted by the present invention is: A method for improving the regeneration of a mixed bed, comprising the following steps: Step 1) Layering; Step 1.1) Open the exhaust valve; Step 1.2) Open the backwash inlet valve and the backwash upper drain valve; Step 1.3) Open the intermediate water pump, manually adjust the backwash inlet valve according to the resin layer height in the upper viewing window of the mixed bed, ensure that the resin height does not exceed the upper viewing window, maintain a stable flow rate for 15 minutes, so that the resin bed is better layered, and observe the layering situation of the anion and cation resins from the lower viewing window. The cation resin is in the upper layer and the anion resin is in the lower layer; Step 1.4) Close the intermediate water pump, the backwash inlet valve, and the backwash upper drain valve in sequence; Step 1.5) Open the lower drain valve, and drain the water in the mixed bed until it reaches 20 cm above the resin layer, then close it; Step 2) Reduction; Step 2.1) Open the caustic inlet valve, the concentrated caustic valve, the acid inlet valve, the concentrated acid valve, and the middle drain valve; Step 2.2) Open the first regeneration pump and the second regeneration pump, and adjust the caustic injection valve and the acid injection valve; Step 2.3) Close the concentrated caustic valve and the concentrated acid valve, keep the regeneration flow rate unchanged until the pH is close to neutral, and the replacement is completed; Step 2.4) Close the first regeneration pump, the second regeneration pump, the caustic inlet valve, the concentrated caustic valve, and the middle drain valve; Step 3) Mix the resins Open the air inlet valve, and close the air inlet valve after mixing; Step 4) Flushing Step 4.1) Open the inlet valve, the intermediate water pump, and the drain valve in sequence; Step 4.2) Detect the conductivity of the water discharged from the drain valve until it reaches the normal value of 0.1 us / cm; Step 4.3) Close the intermediate water pump, the inlet valve and the drain valve in sequence.
[0005] Furthermore, in the step 2.2), the flow rates of the alkali and the acid are both adjusted to 10 - 12 m³ / hr, the concentrations are both controlled at 4 ± 0.5%, and the regeneration time is 40 - 50 min.
[0006] Furthermore, in the step 3), the mixing air pressure is 0.1 - 0.15 MPa and the mixing time is 5 - 10 min.
[0007] Furthermore, the middle drain valve 7 is located 5 - 10 cm below the interface of the anion and cation resins.
[0008] Furthermore, in the step 2.3), the pH value of the regeneration flow rate is 6.8 ≤ pH value ≤ 7.2.
[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: By reducing the failure of alkali leaching, optimizing the regeneration, rinsing and reduction steps, the present invention greatly saves the water consumption, time and chemicals for the regeneration of the mixed bed, improves the working efficiency, and is beneficial to energy conservation and emission reduction. Description of the Drawings
[0010] Figure 1 is a schematic structural diagram of the mixed bed regeneration system of the present invention; Figure 2 is a schematic process flow diagram of the mixed bed regeneration of the present invention; In the figure: 1 - mixed bed, 2 - intermediate water pump, 3 - inlet valve, 4 - backwash inlet valve, 5 - drain valve, 6 - backwash upper drain valve, 7 - middle drain valve; 8 - lower drain valve; 9 - air inlet valve; 10 - exhaust valve, 11 - alkali storage tank, 12 - alkali inlet method, 13 - concentrated acid valve, 14 - first regeneration pump, 15 - alkali ejector, 16 - alkali injection valve, 17 - acid storage tank, 18 - acid inlet valve, 19 - concentrated acid valve, 20 - second regeneration pump, 21, acid ejector, 22 - acid injection valve. Detailed Embodiments
[0011] The present invention will be further described below in conjunction with the embodiments and their accompanying drawings. Embodiment
[0012] As Figure 1-2 shown, an improved method for regenerating a mixed bed includes the following steps: Step 1) Layering; Step 1.1) Open the exhaust valve 10; Step 1.2) Open the backwash inlet valve 4 and the backwash upper drain valve 6; Step 1.3) Open the intermediate water pump 2, manually adjust the opening of the backwash inlet valve 4 according to the resin bed height in the upper viewing window of the mixed bed 1, ensure that the resin height does not exceed the upper end viewing window, maintain a stable flow rate for 15 minutes, so that the resin bed is better stratified, and observe the stratification of anion and cation resins from the lower viewing window. The cation resin is in the upper layer and the anion resin is in the lower layer; Step 1.4) Close the intermediate water pump 2, the backwash inlet valve 4 and the backwash upper discharge valve 6 in sequence; Step 1.5) Open the lower discharge valve 8, drain the water in the mixed bed 1 until it reaches 20 cm above the resin bed, and then close it; Step 2) Restoration; Step 2.1) Open the caustic inlet valve 12, the concentrated caustic valve 13, the acid inlet valve 18, the concentrated acid valve 19, and the middle discharge valve 7. The middle discharge valve 7 is located 5 cm below the interface of anion and cation resins; Step 2.2) Open the first regeneration pump 14 and the second regeneration pump 20, adjust the caustic injection valve 16 and the acid injection valve 22, so that the flow rates of caustic and acid are adjusted to 12 m³ / hr, and the concentrations are both controlled at 4%. The regeneration time is 40 minutes; Step 2.3) Close the concentrated caustic valve 13 and the concentrated acid valve 19, keep the regeneration flow rate unchanged until the pH reaches 7.0, and the replacement is completed; Step 2.4) Close the first regeneration pump 14, the second regeneration pump 20, the caustic inlet valve 12, the concentrated caustic valve 13 and the middle discharge valve 7; Step 3) Mix the resins Open the air inlet valve 9, the mixing air pressure is 0.1 MPa, the mixing time is 8 minutes, and then close the air inlet valve 9 after mixing; Step 4) Flushing Step 4.1) Open the water inlet valve 3, the intermediate water pump 2 and the drain valve 5 in sequence; Step 4.2) Detect the conductivity of the water discharged from the drain valve 5 until it reaches the normal value of 0.1 us / cm; Step 4.3) Close the intermediate water pump 2, the water inlet valve 3 and the drain valve 5 in sequence.
[0013] In Step 2.2), the flow rates of caustic and acid can also be any value between 10 and 12 m³ / hr, the concentrations can also be any value between 4 ± 0.5%, and the regeneration time can also be any value between 40 - 50 minutes; In Step 3), the mixing air pressure can also be any value between 0.1 - 0.15 MPa, and the mixing time can also be any value between 5 - 10 minutes; The distance of the middle discharge valve (7) below the interface of anion and cation resins can also be any value between 5 - 10 cm.
[0014] The pH value of the regeneration flow rate in step 2.3) can also be any value between 6.8 ≤ pH value ≤ 7.2.
[0015] In this embodiment, the regeneration time of the mixed bed is reduced from 4.5 h to 1 h 40 min, the water consumption is reduced by 50%, and the amount of lye used is reduced by about 0.3 t, greatly saving the production cost.
Claims
1. A method for improving mixed bed regeneration, characterized in that: The steps include: Step 1) stratification; Step 1.1) Open the exhaust valve (10); Step 1.2) Open the backwash water inlet valve (4) and the backwash upper discharge valve (6); Step 1.3) Turn on the intermediate water pump (2), and manually adjust the backwash water inlet valve (4) according to the height of the resin layer in the upper viewing window of the mixed bed (1) to ensure that the resin height does not exceed the upper viewing window. Keep the flow rate stable for 15 minutes to allow the resin bed to be well stratified. Observe the stratification of the anion and cation resins from the lower viewing window. The cation resin is in the upper layer and the anion resin is in the lower layer. Step 1.4) Close the intermediate water pump (2), the backwash water inlet valve (4) and the backwash upper discharge valve (6) in sequence; Step 1.5) Open the lower drain valve (8) to drain the water in the mixed bed (1) to 20 cm above the resin layer and then close it; Step 2) Restore; Step 2.1) Open the alkali inlet valve (12), the concentrated alkali valve (13), the acid inlet valve (18), the concentrated acid valve (19), and the middle drain valve (7); Step 2.2) Turn on the first regeneration pump (14) and the second regeneration pump (20), and adjust the alkali injection valve (16) and the acid injection valve (22); Step 2.3) Close the concentrated alkali valve (13) and the concentrated acid valve (19), and keep the regeneration flow rate unchanged until the pH value is close to neutral, and the replacement is completed; Step 2.4) Close the first regeneration pump (14), the second regeneration pump (20), the alkali inlet valve (12), the concentrated alkali valve (13) and the middle discharge valve (7); Step 3) Mix the resin Opening the air intake valve (9), and closing the air intake valve (9) after mixing; Step 4) Rinse Step 4.1) Open the water inlet valve (3), the intermediate water pump (2) and the drain valve (5) in sequence; Step 4.2) Detect the conductivity of the water discharged from the drain valve (5) until it reaches the normal value of 0.1us / cm; Step 4.3) Close the intermediate water pump (2), the water inlet valve (3) and the drain valve (5) in sequence.
2. A method for improving mixed bed regeneration according to claim 1, characterized in that: In step 2.2), the flow rates of alkali and acid are both adjusted to 10-12 m³ / hr, the concentrations are controlled at 4±0.5%, and the regeneration time is 40-50 min.
3. A method for improving mixed bed regeneration according to claim 1, characterized in that: The mixed gas pressure in step 3) is 0.1-0.15 MPa, and the mixing time is 5-10 min.
4. A method for improving mixed bed regeneration according to claim 1, characterized in that: The middle row valve (7) is located 5-10 cm below the interface between the positive and negative resins.
5. A method for improving mixed bed regeneration according to claim 1, characterized in that: The pH value of the regeneration flow in step 2.3) is 6.8≤pH≤7.2.