A processing device for MVR residual liquid
The treatment process, which involves multiple cycles of evaporation, cooling, compression, and pH adjustment, solves the problem of acid salt and calcium-magnesium salt enrichment in MVR residue, achieving efficient wastewater treatment and resource reuse, and avoiding equipment blockage and secondary pollution.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANGZHOU ANTHRACITE TECH CO LTD
- Filing Date
- 2025-09-03
- Publication Date
- 2026-07-24
AI Technical Summary
Existing MVR evaporation technology results in the accumulation of acid salts and calcium and magnesium salts in the residual liquid after long-term circulation, leading to decreased evaporation efficiency, increased energy consumption, and equipment blockage. Existing treatment methods also result in resource waste and secondary pollution.
The treatment process employs multiple cycles of evaporation, cooling, and compression, combined with pH adjustment, stirring and mixing, cooling crystallization kettle, and circulating wastewater system. By removing most of the acid radicals and calcium and magnesium salts, the wastewater is brought within the permissible range of the MVR device, and steam transmission is used to prevent pipe blockage.
It effectively reduces the concentration of acid salts and calcium and magnesium salts in the residual liquid, improves wastewater treatment efficiency, reduces equipment blockage, enables resource reuse, and avoids secondary pollution.
Smart Images
Figure CN224548249U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of wastewater treatment equipment, and more specifically, relates to a device for treating MVR residual liquid. Background Technology
[0002] MVR evaporation technology is widely used in the treatment of high-salinity wastewater. However, after long-term circulation, acid salts and calcium and magnesium salts continue to accumulate in the residual liquid, leading to a decrease in evaporation efficiency and an increase in energy consumption. Salt scaling can clog the equipment, ultimately preventing the extraction of effective products. Existing technologies mostly use direct discharge or chemical precipitation methods, which result in resource waste and secondary pollution. Therefore, there is a need for a treatment device that can remove most of the various acid salts and calcium and magnesium salts from the MVR residual liquid, reduce the concentration of various acid salts and calcium and magnesium salts to within the permissible range, and then allow the liquid to re-enter the MVR device for multi-effect evaporation, thereby improving the wastewater treatment efficiency of the MVR system. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a device for treating MVR residual liquid, which can meet the requirement of bringing the concentration of various acid salts and calcium and magnesium salts within the permissible range for re-entry into the MVR device.
[0004] This utility model discloses a treatment device for MVR residual liquid, comprising a mother liquor storage tank, a pH adjustment mechanism, an evaporation reactor, a cooling crystallization reactor, a filter press, a circulating wastewater tank, a wastewater circulation mechanism, and an MVR residual liquid tank. The mother liquor storage tank is connected to the inlet of the pH adjustment mechanism, and the outlet of the pH adjustment mechanism is connected to the evaporation reactor via a pipeline. The outlet of the evaporation reactor is connected to the inlet of the cooling crystallization reactor, and the side wall outlet of the cooling crystallization reactor is connected to the filter press. The filtrate outlet of the filter press is connected to the circulating wastewater tank, which is connected to both the mother liquor storage tank and the MVR residual liquid tank via the wastewater circulation mechanism. Through multiple cycles of evaporation, cooling, and compression, most of the various acid radicals and calcium and magnesium salts are removed, bringing the wastewater to a permissible range for treatment by the MVR device and reducing the continuous accumulation of acid radicals and calcium and magnesium salts in the residual liquid.
[0005] As a further improvement of this utility model, the pH adjustment mechanism includes a liquid alkali storage tank and a stirring mixing tank. The mother liquor storage tank is connected to the upper inlet of the side wall of the stirring mixing tank, the liquid alkali storage tank is connected to the top inlet of the stirring mixing tank, and the lower outlet of the side wall of the stirring mixing tank is connected to the evaporation reactor. The stirring mixing tank is equipped with a turbine stirrer to fully and evenly mix the sewage mother liquor and liquid alkali, so that the pH of the mixed liquid is stable and reaches the reaction range more quickly, thereby improving the sewage treatment efficiency.
[0006] As a further improvement of this utility model, the cooling crystallizer has a built-in cooling coil and a guide tube. The cooling coil is closely attached to the inner wall of the cooling crystallizer and is fixed in a spiral shape around the inside of the cooling crystallizer. The guide tube is fixed vertically and centrally inside the cooling crystallizer. The cooling coil does not directly contact the guide tube, which improves the heat exchange efficiency of the cooling crystallizer and accelerates the crystallization and precipitation of salt. The outside of the cooling crystallizer is also covered with a heat insulation layer to reduce the loss of cold energy and reduce losses.
[0007] As a further improvement of this utility model, it also includes a transfer tank. The inlet of the transfer tank is connected to the filtrate outlet of the filter press, and the outlet is connected to a circulating sewage tank, so that the water discharged from the filter press installed at a low position can be discharged into a large-sized circulating sewage tank after passing through the transfer tank.
[0008] As a further improvement of this utility model, the sewage circulation mechanism includes a first circulation pipe and a second circulation pipe. The inlets of the first and second circulation pipes are both connected to the outlet of the circulating sewage tank. The outlet of the first circulation pipe is connected to the mother liquor storage tank, and the second circulation pipe is connected to the mother liquor storage tank and the MVR residual liquid tank. After the sewage undergoes the first evaporation, cooling, compression, and desalination process and is input into the circulating sewage tank, the sewage returns to the mother liquor storage tank through the first circulation pipe for secondary treatment. After the sewage undergoes the first evaporation, cooling, compression, and desalination process and is input into the circulating sewage tank, the qualified sewage is transported to the MVR residual liquid tank through the second circulation pipe, and a portion of the sewage is sent back to the mother liquor storage tank to continue mixing with the new sewage mother liquor for subsequent evaporation, cooling, compression, and desalination steps.
[0009] As a further improvement of this utility model, it also includes two steam transmission pipes, which are respectively connected to the mixing tank and the circulating sewage tank. Solid crystals may block the pipes. At this time, steam is passed through to heat and dissolve the solids to clear the pipes and prevent blockage.
[0010] As a further improvement of this utility model, a concentration detector is fixedly installed at the outlet of the circulating sewage tank to detect whether the salt content of the sewage discharged from the circulating sewage tank meets the standard, thereby controlling whether the second circulation pipe outputs sewage to the MVR residual liquid tank and the conveying flow rate.
[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: it adopts multiple cycles of evaporation, cooling and compression to remove most of the various acid salts and calcium and magnesium salts, so that the wastewater can reach the permissible range for treatment by the MVR device, and reduces the continuous enrichment of acid salts and calcium and magnesium salts in the residual liquid. The mixing tank is equipped with a turbine agitator to thoroughly and evenly mix the mother liquor and liquid alkali, stabilizing the pH of the mixed liquid and bringing it to the reaction range more quickly, thus improving wastewater treatment efficiency. The cooling crystallization kettle has built-in cooling coils and a guide tube to improve its heat exchange efficiency and accelerate salt crystallization. The cooling crystallization kettle is also covered with an insulation layer to reduce heat loss and reduce waste. A concentration detector is fixedly installed at the outlet of the circulating wastewater tank to detect whether the salt content of the wastewater discharged from the circulating wastewater tank meets the standards. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 For the present utility model Figure 1 Enlarged view of region A and cross-sectional view of the mixing tank; Figure 3 This is a schematic diagram of the cooling crystallization kettle structure of this utility model; Figure 4 For the present utility model Figure 1 Enlarged schematic diagram of region B in the middle.
[0013] Explanation of the labels in the diagram: Mother liquor storage tank 1; pH adjustment mechanism 2; liquid alkali storage tank 21; stirring tank 22; turbine stirrer 221; evaporation reactor 3; cooling crystallization reactor 4; cooling coil 41; guide tube 42; insulation layer 43; filter press 5; transfer tank 6; circulating sewage tank 7; concentration detector 71; sewage circulation mechanism 8; first circulation pipe 81; second circulation pipe 82; MVR residual liquid tank 9; steam transmission pipe a. Detailed Implementation
[0014] Specific Implementation Example 1: Please refer to Figures 1-4 This utility model relates to a treatment device for MVR residual liquid, including a mother liquor storage tank 1, a pH adjustment mechanism 2, an evaporation reactor 3, a cooling crystallization reactor 4, a filter press 5, a transfer tank 6, a circulating sewage tank 7, a sewage circulation mechanism 8, and an MVR residual liquid tank 9. The mother liquor storage tank 1 is connected to the inlet of the pH adjustment mechanism 2, and the outlet of the pH adjustment mechanism 2 is connected to the evaporation reactor 3 through a pipe. The evaporation reactor 3 is located on the third floor, and its bottom outlet is connected to the top inlet of the cooling crystallization reactor 4 located on the second floor. The side wall outlet of the cooling crystallization reactor 4 is connected to the filter press 5, and the filtrate outlet of the filter press 5 is connected to the transfer tank 6. The transfer tank 6 is connected to the circulating sewage tank 7, so that the water discharged from the filter press 5 installed at a low position can be put into the large-sized circulating sewage tank 7 after passing through the transfer tank 6. The circulating sewage tank 7 is connected to the mother liquor storage tank 1 and the MVR residual liquid tank 9 through the sewage circulation mechanism 8.
[0015] In a further embodiment, such as Figure 2As shown, the pH adjustment mechanism 2 includes a liquid alkali storage tank 21 and a stirring mixing tank 22. The mother liquor storage tank 1 is connected to the upper inlet of the side wall of the stirring mixing tank 22, the liquid alkali storage tank 21 is connected to the top inlet of the stirring mixing tank 22, and the lower outlet of the side wall of the stirring mixing tank 22 is connected to the evaporation reactor 3. The stirring mixing tank 22 is equipped with a turbine stirrer 221 to fully and evenly mix the sewage mother liquor and liquid alkali, so that the pH of the mixed liquid is stable and reaches the reaction range more quickly, thereby improving the sewage treatment efficiency.
[0016] In a further embodiment, such as Figure 3 As shown, the cooling crystallization vessel 4 has a built-in cooling coil 41 and a guide tube 42. The cooling coil 41 is closely attached to the inner wall of the cooling crystallization vessel 4 and is fixed in a spiral shape around the inner side of the vessel. The guide tube 42 is fixed vertically and centrally inside the cooling crystallization vessel 4. The cooling coil 41 does not directly contact the guide tube 42, which improves the heat exchange efficiency of the cooling crystallization vessel 4 and accelerates the crystallization and precipitation of salt. The outer side of the cooling crystallization vessel 4 is also covered with a heat insulation layer 43 to reduce the loss of cold energy and reduce losses.
[0017] In a further embodiment, such as Figure 1 As shown, the wastewater circulation mechanism 8 includes a first circulation pipe 81 and a second circulation pipe 82. The inlets of both the first circulation pipe 81 and the second circulation pipe 82 are connected to the outlet of the circulating wastewater tank 7. The outlet of the first circulation pipe 81 is connected to the mother liquor storage tank 1. The outlet of the second circulation pipe 82 is connected to the mother liquor storage tank 1 and the MVR residual liquid tank 9 through a three-way valve. This valve can control whether the second circulation pipe 82 delivers wastewater to the mother liquor storage tank 1 and the MVR residual liquid tank 9 and the delivery flow rate. After the wastewater undergoes the first evaporation, cooling, compression, and desalination process and is input into the circulating wastewater tank 7, the wastewater returns to the mother liquor storage tank 1 through the first circulation pipe 81 for secondary treatment. After the wastewater undergoes the second evaporation, cooling, compression, and desalination process and is input into the circulating wastewater tank 7, the wastewater is transported to the MVR residual liquid tank 9 through the second circulation pipe 82, and a portion of the wastewater is sent back to the mother liquor storage tank 1 to continue mixing with the new wastewater mother liquor for subsequent evaporation, cooling, compression, and desalination. The flow rate ratio of the wastewater entering the MVR residual liquid tank 9 and returning to the mother liquor storage tank 1 after the second desalination is 9:1.
[0018] In a further embodiment, such as Figure 1 As shown, it also includes two steam transmission pipes a, which are connected to the mixing tank 22 and the circulating sewage tank 7 respectively. Solid crystals may block the pipes. At this time, steam is used to heat and dissolve the solids to clear the pipes and prevent blockage.
[0019] In a further embodiment, such as Figure 2As shown, after the mother liquor is fed into the mixing tank 22, liquid alkali is added to adjust the pH of the wastewater to 5; the concentration of the reaction liquid after evaporation in the evaporation reactor 3 is 60%; the cooling rate in the cooling crystallization reactor 4 is 3.5℃ / h to ensure a complete reaction and that the crystallization endpoint temperature of the precipitated salt is 35℃, thereby ensuring the salt precipitation rate.
[0020] In a further embodiment, such as Figure 4 As shown, a concentration detector 71 is fixedly installed at the outlet of the circulating sewage tank 7 to detect whether the salt content of the sewage discharged from the circulating sewage tank 7 meets the standard, thereby controlling whether the second circulation pipe 82 outputs sewage to the MVR residual liquid tank 9 and the flow rate.
[0021] In operation, the wastewater mother liquor is fed from the mother liquor storage tank 1 into the mixing tank 22, while liquid alkali is added to the mixing tank 22. The turbine agitator 221 starts stirring and adjusts the pH value of the mixed wastewater. Then, it is fed into the evaporation reactor 3 to evaporate the water. The mixed wastewater is then fed into the cooling crystallization reactor 4 to precipitate various acid radicals and calcium and magnesium salts. Subsequently, the wastewater from the cooling crystallization reactor 4 enters the filter press 5 to filter out various acid radicals and calcium and magnesium salts. The wastewater with the salts filtered out is discharged from the filter press 5 into the transfer tank 6, and then fed into the circulating wastewater tank 7 through the transfer tank 6. The wastewater in the circulating wastewater tank 7 is returned to the mother liquor storage tank 1 through the first circulation pipe 81. The above steps are repeated, and after passing through the mixing tank 22, evaporation reactor 3, cooling crystallization reactor 4, filter press 5, and transfer tank 6 again, it returns to the circulating wastewater tank 7. The wastewater after the second treatment is discharged through the second circulation pipe 82 to the MVR residual liquid tank 9 to be put into the MVR device, and a portion is returned to the mother liquor storage tank 1 to mix with new mother liquor wastewater to continue precipitating salts.
Claims
1. A device for treating residual liquid from MVR (Mechanical Vapor Resin Extraction) treatment, characterized in that: The system includes a mother liquor storage tank (1), a pH adjustment mechanism (2), an evaporation reactor (3), a cooling crystallization reactor (4), a filter press (5), a circulating sewage tank (7), a sewage circulation mechanism (8), and an MVR residual liquid tank (9). The mother liquor storage tank (1) is connected to the inlet of the pH adjustment mechanism (2), and the outlet of the pH adjustment mechanism (2) is connected to the evaporation reactor (3) through a pipe. The outlet of the evaporation reactor (3) is connected to the inlet of the cooling crystallization reactor (4), and the side wall outlet of the cooling crystallization reactor (4) is connected to the filter press (5). The filtrate outlet of the filter press (5) is connected to the circulating sewage tank (7), and the circulating sewage tank (7) is connected to the mother liquor storage tank (1) and the MVR residual liquid tank (9) through the sewage circulation mechanism (8).
2. The device for treating MVR residual liquid according to claim 1, characterized in that: The pH adjustment mechanism (2) includes a liquid alkali storage tank (21) and a stirring mixing tank (22). The mother liquor storage tank (1) is connected to the upper inlet of the side wall of the stirring mixing tank (22), the liquid alkali storage tank (21) is connected to the top inlet of the stirring mixing tank (22), and the lower outlet of the side wall of the stirring mixing tank (22) is connected to the evaporation reactor (3). The stirring mixing tank (22) is equipped with a turbine stirrer (221).
3. The device for treating MVR residual liquid according to claim 1, characterized in that: The cooling crystallizer (4) has a built-in cooling coil (41) and a guide tube (42). The cooling coil (41) is closely attached to the inner wall of the cooling crystallizer (4) and is fixed in a spiral shape around the inside of the cooling crystallizer (4). The guide tube (42) is fixed vertically in the center inside the cooling crystallizer (4). The cooling coil (41) does not directly contact the guide tube (42). The outside of the cooling crystallizer (4) is also covered with a heat insulation layer (43).
4. The device for treating MVR residual liquid according to claim 1, characterized in that: It also includes a transfer tank (6), the inlet of which is connected to the filtrate outlet of the filter press (5), and the outlet is connected to the circulating sewage tank (7).
5. The device for treating MVR residual liquid according to claim 1, characterized in that: The wastewater circulation mechanism (8) includes a first circulation pipe (81) and a second circulation pipe (82). The inlets of the first circulation pipe (81) and the second circulation pipe (82) are both connected to the outlet of the circulating wastewater tank (7). The outlet of the first circulation pipe (81) is connected to the mother liquor storage tank (1), and the second circulation pipe (82) is connected to the mother liquor storage tank (1) and the MVR residual liquid tank (9).
6. The device for treating MVR residual liquid according to claim 1, characterized in that: It also includes two steam transmission pipes (a), which are connected to the mixing tank (22) and the circulating sewage tank (7), respectively.
7. The device for treating MVR residual liquid according to claim 1, characterized in that: A concentration detector (71) is fixedly installed at the outlet of the circulating sewage tank (7).