Pickling system for FBC hardness removal fluidized bed
By introducing an acid washing system into the FBC de-hardening fluidized bed to remove calcium carbonate, the clogging problem of the fluidized bed crystallization de-hardening reactor is solved, and an efficient and short-time cleaning effect is achieved, which is suitable for fluidized bed reactors of different diameters.
Patent Information
- Application Number
- CN202422900953.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-11-27
AI Technical Summary
During the operation of the FBC de-hardening fluidized bed, calcium carbonate suspension adheres to the inlet water, reflux distributor and tower body, causing blockage and affecting the normal operation of the reactor.
A pickling system is designed, including a discharge pump, a pickling dosing tank and a dosing pump. The pickling system removes calcium carbonate from the influent, reflux distributor and tower body of the FBC de-hardening fluidized bed and is suitable for fluidized bed crystallization de-hardening reactors of different diameters.
It achieves short-time and efficient cleaning, reduces the amount of chemicals, shortens the cleaning time, prevents blockage, restores the reactor function, and is suitable for fluidized bed reactors of various diameters.
Smart Images
Figure CN223480944U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fluidized bed technology, and in particular to an acid washing system for FBC dehardening fluidized beds. Background Technology
[0002] When the velocity of the fluid passing through a particle bed is gradually increased to a certain value, all the particles become suspended in the fluid, but remain within the bed and are not carried away by the fluid. This state of the bed is similar to that of a liquid, and this type of reactor is called a fluidized bed crystallization hardening reactor. In a fluidized bed crystallization hardening reactor, solid particles are suspended in a moving fluid, giving the particles some of the apparent characteristics of a fluid, resulting in high mass transfer rates and fast reaction speeds. Tower-type fluidized bed crystallization hardening is widely used in wastewater treatment. During the operation of an FBC hardening fluidized bed, as calcium and magnesium ions are removed by forming calcium carbonate, a small amount of calcium carbonate suspension adheres to the inside of the influent and return distributors. The longer the operation time, the more calcium carbonate adheres, eventually causing blockage inside the influent and return distributors, affecting the normal operation of the reactor. Utility Model Content
[0003] Technical problem solved: In view of the technical problems existing in the operation of FBC de-hardening fluidized bed, this utility model provides an acid washing system for FBC de-hardening fluidized bed. By adding an acid washing system to the FBC de-hardening fluidized bed, the calcium carbonate adhering to the inlet water, reflux distributor and tower body of the FBC de-hardening fluidized bed is removed. It can be adapted to fluidized bed crystallization de-hardening reactors of various diameters and solves the problem of reactor scaling and clogging.
[0004] Technical solution: The present invention describes an acid washing system for an FBC de-hardening fluidized bed, wherein the FBC de-hardening fluidized bed includes a reflux zone, an inlet water zone, and a packing zone arranged from bottom to top along its height direction;
[0005] The pickling system includes an unloading pump, a pickling dosing tank, and a dosing pump;
[0006] The inlet and outlet of the unloading pump are connected to the first conveying pipeline and the third conveying pipeline respectively, and the inlet end of the unloading pump is connected to the 30% hydrochloric acid storage tank; the first conveying pipeline is connected to the outlet end of the water inlet area and the outlet end of the reflux area respectively.
[0007] The acid pickling dosing tank is connected to the third conveying pipeline and the tap water source, and the outlet end of the acid pickling dosing tank is connected to the dosing pump, and the outlet end of the dosing pump is connected to the inlet end of the water inlet area and the inlet end of the return flow area, respectively.
[0008] Preferably, the top of the packing zone of the FBC de-hardening fluidized bed is connected to a tap water source, and the bottom of its packing zone is connected to a second conveying pipe connected to a discharge pump.
[0009] A reflux pipe is provided at the top of the packing zone of the FBC de-hardening fluidized bed, and the outlet end of the reflux pipe is connected to the reflux zone of the FBC de-hardening fluidized bed.
[0010] Preferably, a first electromagnetic flow meter is provided at the outlet end of the unloading pump, and a second electromagnetic flow meter is provided at the outlet end of the dosing pump.
[0011] Preferably, the return pipe is connected to a return pump, and a third electromagnetic flow meter is installed at the outlet end of the return pump.
[0012] Preferably, the pickling tank is equipped with a stirrer.
[0013] Compared with the prior art, the present invention has at least the following beneficial effects:
[0014] 1. This utility model adds an acid washing system to the FBC de-hardening fluidized bed, which removes the calcium carbonate adhering to the inlet water, reflux distributor and tower body of the FBC de-hardening fluidized bed, and promotes the application of fluidized bed crystallization de-hardening technology.
[0015] 2. This pickling system is an integrated module, with a small footprint and a high degree of automation, and can adapt to the cleaning operations of fluidized bed reactors of various diameters;
[0016] 3. The pickling system can perform short-term, high-efficiency cleaning of the FBC de-hardened fluidized bed (approximately once per quarter). The pickling water can be returned to the inlet of the unloading pump to form a circulating cleaning cycle. The required cleaning dosage is smaller; when cleaning the return zone or the inlet water zone, the dosage can be reduced to 50L (30% hydrochloric acid). The short-term, high-efficiency cleaning requires even shorter cleaning times; when cleaning the inlet water zone, the time can be shortened to 20 minutes; when cleaning the return zone, the time can be shortened to 1 hour.
[0017] 4. The acid washing system can perform full-function restorative cleaning of the FBC de-hardening fluidized bed (about once a year), and can perform comprehensive descaling and unblocking cleaning inside the tower. It uses the tower's matching reflux pump for its own large-scale circulation cleaning, requiring a smaller dosage of cleaning chemicals.
[0018] This invention also has other beneficial effects, which are described in the embodiments section of the specification and will not be repeated here. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the acid washing system of the FBC de-hardening fluidized bed of this utility model.
[0020] Reference numerals in the attached diagram: 1. FBC (Fluidized Bed) de-hardening fluidized bed; 2. Recirculation zone; 3. Inlet water zone; 4. Packing zone; 5. Tap water source; 6. 30% hydrochloric acid storage tank; 7. Unloading pump; 8. First electromagnetic flowmeter; 9. First conveying pipeline; 10. Acid washing dosing tank; 11. Agitator; 12. Second conveying pipeline; 13. Dosing pump; 14. Second electromagnetic flowmeter; 15. Inlet end of inlet water zone; 16. Inlet end of recirculation zone; 17. Recirculation pipeline; 18. Recirculation pump; 19. Third electromagnetic flowmeter; 20. Outlet end of inlet water zone; 21. Outlet end of recirculation zone; 22. Third conveying pipeline. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings. Figure 1 The technical solutions of the embodiments of this utility model are clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.
[0022] Example 1: Figure 1 As shown, this utility model provides an acid washing system for an FBC de-hardening fluidized bed. The FBC de-hardening fluidized bed 1 includes a reflux zone 2, an inlet water zone 3, and a packing zone 4 arranged from bottom to top along its height direction. The acid washing system includes a discharge pump 7, an acid washing dosing tank 10, and a dosing pump 13; an agitator 11 is installed inside the acid washing dosing tank 10. The inlet and outlet ends of the discharge pump 7 are respectively equipped with three-way valve structures. Its inlet end is connected to a 30% hydrochloric acid storage tank 6 and a first conveying pipe 9, respectively. Its outlet end is connected to a second conveying pipe 12 and a third conveying pipe 22. The first conveying pipe 9 is connected to the outlet end 20 of the inlet water zone and the outlet end 21 of the reflux zone through the three-way valve structure. That is, the acidic liquid produced in the inlet water zone 3 and the reflux zone 2 of the FBC de-hardening fluidized bed during the cleaning process can be circulated through the system by the discharge pump 7, reducing the consumption of hydrochloric acid.
[0023] The pickling dosing tank 10 is connected to the third conveying pipeline 22 and the tap water source 5. The unloading pump 7 can pump 30% hydrochloric acid into the pickling dosing tank 10 and receive tap water to dilute the 30% hydrochloric acid to prepare a diluted solution. The outlet end of the pickling dosing tank 10 is connected to the dosing pump 13, and the outlet end of the dosing pump 13 is connected to the inlet end 15 of the inlet area and the inlet end 16 of the reflux area. The diluted solution can be selectively pumped into the inlet area 3 and the reflux area 2 of the FBC de-hardening fluidized bed for short-term and efficient cleaning.
[0024] A first electromagnetic flow meter 8 is installed at the outlet end of the unloading pump 7, and a second electromagnetic flow meter 14 is installed at the outlet end of the dosing pump 13. The liquid flow rate can be detected by the first electromagnetic flow meter 8 and the second electromagnetic flow meter 14.
[0025] Example 2: Based on Example 1, the top of the packing area 4 of the FBC hardening removal fluidized bed is connected to the tap water source 5, and the bottom of its packing area 4 is connected through the second conveying pipeline 12 connected to the discharging pump 7. 30% hydrochloric acid can be directly pumped into the packing area 4 through the second conveying pipeline 12. 30% hydrochloric acid and tap water can be fully mixed and cleaned in the packing area 4. A reflux pipeline 17 is arranged at the top of the packing area 4 of the FBC hardening removal fluidized bed. The outlet end of the reflux pipeline 17 is connected to the reflux area 2 of the FBC hardening removal fluidized bed. The reflux pipeline 17 is connected to a reflux pump 18, and a third electromagnetic flowmeter 19 is correspondingly arranged at the outlet end of the reflux pump 18. During operation, 30% hydrochloric acid can be directly pumped into the packing area 4 of the FBC hardening removal fluidized bed by the discharging pump 7. At the same time, tap water is connected to the top of the packing area 4 to dilute 30% hydrochloric acid, and then the whole-function restoration cleaning inside the tower body is carried out by using the reflux pump 18 supporting the tower body.
[0026] The utility model adds an acid cleaning system for the FBC hardening removal fluidized bed. The acid cleaning system can remove the calcium carbonate attached to the water inlet, reflux distributor and tower body of the FBC hardening removal fluidized bed, and can select the cleaning mode according to requirements, promoting the popularization and application of the fluidized bed crystallization hardening removal technology.
[0027] The acid cleaning system of the utility model can clean the FBC hardening removal fluidized bed efficiently in a short time (about once every quarter). The water after acid cleaning can flow back to the inlet end of the discharging pump 7 to form a circulating cleaning. The amount of chemical agent required for cleaning is smaller. When cleaning the reflux area 2 or the water inlet area 3, the amount of chemical agent can be reduced to 50 L (30% hydrochloric acid); the cleaning time required for efficient cleaning in a short time is shorter. When cleaning the water inlet area 3, the time can be shortened to 20 minutes; when cleaning the reflux area 2, the time can be shortened to 1 hour. The acid cleaning system can carry out whole-function restoration cleaning on the FBC hardening removal fluidized bed (about once a year), can comprehensively remove scale and dredge the inside of the tower body, and uses the reflux pump 18 supporting the tower body to carry out its own large-circulation cleaning. The amount of chemical agent required for cleaning is smaller.
[0028] The above are the preferred embodiments of the utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the utility model, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the utility model.
Claims
1. An acid washing system for FBC de-hardening fluidized beds, characterized in that, The FBC de-hardening fluidized bed (1) includes a reflux zone (2), an inlet zone (3), and a packing zone (4) arranged from bottom to top along its height direction; The pickling system includes a discharge pump (7), a pickling dosing tank (10), and a dosing pump (13); The inlet and outlet of the unloading pump (7) are connected to the first conveying pipe (9) and the third conveying pipe (22) respectively, and the inlet end of the unloading pump (7) is connected to the 30% hydrochloric acid storage tank (6); the first conveying pipe (9) is connected to the outlet end (20) of the water inlet area and the outlet end (21) of the reflux area respectively; The acid washing dosing tank (10) is connected to the third conveying pipeline (22) and the tap water source (5) respectively, and the outlet end of the acid washing dosing tank (10) is connected to the dosing pump (13), and the outlet end of the dosing pump (13) is connected to the inlet end (15) of the water inlet area and the inlet end (16) of the return flow area respectively.
2. The acid washing system for FBC de-hardening fluidized beds according to claim 1, characterized in that, The top of the packing zone (4) of the FBC de-hardening fluidized bed is connected to the tap water source (5), and the bottom of its packing zone (4) is connected to the second conveying pipe (12) connected to the unloading pump (7); A return pipe (17) is provided at the top of the packing zone (4) of the FBC de-hardening fluidized bed, and the outlet end of the return pipe (17) is connected to the return zone (2) of the FBC de-hardening fluidized bed.
3. The acid washing system for FBC de-hardening fluidized beds according to claim 1, characterized in that, The discharge pump (7) is equipped with a first electromagnetic flow meter (8) at its outlet end, and the dosing pump (13) is equipped with a second electromagnetic flow meter (14) at its outlet end.
4. The acid washing system for FBC de-hardening fluidized beds according to claim 2, characterized in that, The return pipe (17) is connected to the return pump (18), and a third electromagnetic flow meter (19) is correspondingly installed at the outlet end of the return pump (18).
5. The acid washing system for FBC de-hardening fluidized beds according to claim 1, characterized in that, A stirrer (11) is installed inside the pickling dosing tank (10).