Novel refrigeration system for sewage treatment

Abstract

The utility model discloses a novel refrigeration system for sewage treatment, which comprises a water inlet tank for storing sewage concentrated solution; the precooling heat exchanger is used for precooling the sewage concentrated solution in the water inlet tank; the water pump is used for feeding the sewage concentrated solution in the water inlet tank into the crystallizing tank; the crystallizing tank is used for separating out salt in the sewage concentrated solution, precipitating and shunting; the freezing heat exchanger is used for cooling the sewage concentrated solution in the crystallizing tank; the circulating pump is used for circularly conveying the sewage concentrated solution between the crystallizing tank and the freezing heat exchanger; and the centrifugal machine is used for carrying out solid-liquid separation on the sewage concentrated solution with high salt content at the lower part of the crystallizing tank. The utility model has the advantages of simple structure, more convenient transportation and quicker installation after the modular design; the freezing effect is good, salt in sewage is fully separated out, and therefore the sewage treatment efficiency is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment technical field, concretely relates to a novel freezing system for sewage treatment. BACKGROUND

[0002] At present, the difficult sewage is generally evaporated and concentrated, and the electric, gas and coal boiler evaporation devices are generally used at home and abroad. Since the operation temperature is high, the steam pressure is large, the equipment material requires high corrosion resistance and pressure resistance, pressure operation is required, and the pressure-bearing equipment is very expensive. The coal boiler evaporation and concentration device has been basically eliminated or is being eliminated due to serious environmental pollution. The gas heating boiler evaporation and concentration device is not widely used due to safety and economy. Due to convenience and environmental protection, the electric heating concentration device is currently increasing, but the energy consumption of single-stage electric boiler is very high. Even if multi-stage evaporation is used, the energy consumption of electric boiler evaporation and concentration device per ton of water is still about 200kwh-300kwh. The equipment investment of electric boiler evaporation and concentration device is high, and the energy consumption is still high. For the MVR steam compression evaporation and concentration system, even if multi-stage evaporation and concentration are used, the energy consumption per ton of water is still as high as 200kwh, and the process is complex, the equipment requirement is high, and the investment cost is high.

[0003] For the heat pump low-temperature vacuum evaporation and concentration system, the energy consumption per ton of water is still as high as 200kwh, and the process has vacuum pressure-bearing equipment, which is expensive and has high investment cost. The heat pump evaporation and dehumidification concentration sewage can evaporate and concentrate the sewage at low temperature and normal pressure, the equipment requirement is low, the investment is less, and due to the 3-4 times energy efficiency improvement of the heat pump, the energy consumption per ton of water can be reduced to about 200kwh, but the energy consumption is still relatively high.

[0004] In order to reduce the energy consumption of sewage treatment process, the existing technology develops a freezing concentration method for sewage treatment, but due to the defects in the design of the existing freezing system, the freezing effect is relatively poor, and the salt in the sewage is not fully analyzed, so that the sewage treatment efficiency is relatively low.

[0005] Therefore, the existing novel freezing system for sewage treatment needs to be further improved. UTILITY MODEL CONTENT

[0006] The utility model aims at overcoming the defects in the prior art, and provides a freezing system which has simple structure, good freezing effect, fully analyzes the salt in the sewage, and effectively improves the sewage treatment efficiency.

[0007] In order to achieve the above object, the utility model adopts the following scheme: a novel freezing system for sewage treatment, characterized by comprising a water inlet tank, a pre-cooling heat exchanger, a water pump, a crystallization tank, a freezing heat exchanger, a circulating pump and a centrifugal machine.

[0008] an inlet water tank for storing sewage concentrate liquid;

[0009] a pre-cooling heat exchanger for pre-cooling and cooling the sewage concentrate liquid in the inlet water tank, the outlet end of the inlet water tank being connected to the inlet end of the pre-cooling heat exchanger, and the outlet end of the pre-cooling heat exchanger being connected to the inlet end of the inlet water tank;

[0010] a water pump for sending the sewage concentrate liquid in the inlet water tank into a crystallization tank;

[0011] the crystallization tank for separating and precipitating the salt in the sewage concentrate liquid;

[0012] a freezing heat exchanger for cooling and cooling the sewage concentrate liquid in the crystallization tank;

[0013] a circulating pump for circulating and conveying the sewage concentrate liquid between the crystallization tank and the freezing heat exchanger, the inlet end of the circulating pump being connected to the outlet end of the crystallization tank, the outlet end of the circulating pump being connected to the inlet end of the freezing heat exchanger, and the outlet end of the freezing heat exchanger being connected to the inlet end of the crystallization tank;

[0014] a centrifuge for solid-liquid separation of the sewage concentrate liquid with high salt content in the lower part of the crystallization tank, the inlet end of the centrifuge being connected to the concentrate outlet in the lower part of the crystallization tank.

[0015] As another improvement of the novel freezing system for sewage treatment, the inlet water tank comprises an inlet water tank body, a first stirring shaft is arranged in the inlet water tank body, the upper end of the first stirring shaft is connected to a first stirring motor arranged at the upper end of the inlet water tank body, and a plurality of first stirring pieces are arranged on the first stirring shaft at intervals.

[0016] As another improvement of the novel freezing system for sewage treatment, two adjacent first stirring pieces are arranged vertically.

[0017] As another improvement of the novel freezing system for sewage treatment, a first water outlet pipe is arranged at the lower part of the inlet water tank, the feeding end of a feeding pump is connected to the first water outlet pipe, and the discharging end of the feeding pump is connected to the inlet end of the pre-cooling heat exchanger.

[0018] As another improvement of the novel freezing system for sewage treatment, the crystallization tank comprises a base, a crystallization tank body is arranged on the base, an overflow pipe is arranged at the upper part of the crystallization tank body, a second stirring shaft is arranged in the crystallization tank body, the second stirring shaft is connected to a second stirring motor arranged at the upper end of the crystallization tank body, a second stirring piece is arranged at the lower end of the second stirring shaft, and a water inlet pipe and a second water outlet pipe are arranged at the upper part of the crystallization tank body.

[0019] As another improvement of the utility model, an annular step is arranged in the crystallization tank body, an annular baffle is arranged on the inner side of the annular step, the annular step, the annular baffle and the crystallization tank body jointly enclose an overflow channel, and the overflow pipe is communicated with the overflow channel.

[0020] As another improvement of the utility model, an annular tooth is arranged on the upper end of the annular baffle.

[0021] As another improvement of the utility model, a central sleeve is arranged in the upper part of the crystallization tank body, the second stirring shaft is arranged in the central sleeve, a flow guide channel is formed between the inner wall of the central sleeve and the outer wall of the second stirring shaft, the lower end of the central sleeve extends into the lower part of the crystallization tank body, and the second water outlet pipe is communicated with the middle part of the central sleeve.

[0022] As another improvement of the utility model, the refrigeration heat exchanger is connected with the refrigerator.

[0023] As another improvement of the utility model, a collecting hopper is arranged below the discharge port of the centrifugal machine.

[0024] The

[0025] As another improvement of the utility model, the water inlet tank, the precooling heat exchanger, the water pump, the refrigeration heat exchanger and the circulating pump are arranged in the first mounting frame, and the centrifugal machine is arranged in the second mounting frame.

[0026] In summary, the utility model has the advantages that: the utility model has simple structure, and the system is composed of a water inlet tank, a precooling heat exchanger, a water pump, a crystallization tank, a refrigeration heat exchanger, a circulating pump and a centrifugal machine.

[0027] In this invention, the concentrated wastewater first enters the inlet tank, where it is pre-cooled by a heat exchanger, initially lowering its temperature. Then, a water pump pumps the concentrated wastewater into a crystallization tank, where a circulation pump sends it to a refrigeration heat exchanger for further cooling. The cooled wastewater then flows back to the crystallization tank, and this cycle continues until the temperature is lowered to approximately -5°C. This further precipitates the salts in the concentrated wastewater. The precipitated salts are then separated in the crystallization tank; the clearer liquid at the top overflows through an overflow pipe, while the lower portion, with higher salt content, is pumped to a centrifuge for solid-liquid separation. This method results in relatively high wastewater treatment efficiency and a relatively good treatment effect. Attached Figure Description

[0028] Figure 1 This is one of the three-dimensional schematic diagrams of this utility model.

[0029] Figure 2 This is the second three-dimensional schematic diagram of the present invention.

[0030] Figure 3 This is a schematic diagram of the structure of this utility model.

[0031] Figure 4 This is a three-dimensional schematic diagram of the crystallization tank of this utility model.

[0032] Figure 5 for Figure 4 A cross-sectional schematic diagram.

[0033] Figure 6 This is a three-dimensional schematic diagram of the water inlet tank of this utility model.

[0034] Figure 7 for Figure 6 A cross-sectional schematic diagram.

[0035] In the diagram: 1. Inlet tank; 101. Inlet tank body; 102. First stirring shaft; 103. First stirring motor; 104. First stirring component; 2. Precooling heat exchanger; 3. Water pump; 4. Crystallization tank; 41. Base; 42. Crystallization tank body; 43. Overflow pipe; 44. Second stirring shaft; 45. Second stirring motor; 46. Second stirring component; 47. Inlet pipe; 48. Second outlet pipe; 49. Annular step; 410. Annular baffle; 5. Refrigeration heat exchanger; 6. Circulation pump; 7. Centrifuge; 8. First outlet pipe; 9. Feed pump; 10. Central sleeve; 11. Refrigeration unit; 12. First mounting bracket; 13. Second mounting bracket; 14. Collection hopper. Detailed Implementation

[0036] The above-mentioned and other technical features and advantages of this utility model will be described in more detail below with reference to the accompanying drawings.

[0037] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0038] It should be noted that in the description of this utility model, the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0039] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] like Figures 1-7 As shown, a novel refrigeration system for wastewater treatment includes an inlet tank 1, a precooling heat exchanger 2, a water pump 3, a crystallizing tank 4, a refrigeration heat exchanger 5, a circulating pump 6, and a centrifuge 7; wherein:

[0041] Inlet tank 1 is used to store concentrated wastewater solution;

[0042] The precooling heat exchanger 2 is used to precool the concentrated wastewater in the inlet tank 1. The outlet of the inlet tank 1 is connected to the inlet of the precooling heat exchanger 2, and the outlet of the precooling heat exchanger 2 is connected to the inlet of the inlet tank 1.

[0043] Water pump 3 is used to send the concentrated wastewater in the inlet tank 1 into the crystallization tank 4;

[0044] Crystallization tank 4 is used to extract salts from concentrated wastewater and to precipitate and divert them.

[0045] Refrigeration heat exchanger 5 is used to cool down the concentrated wastewater in crystallizer 4;

[0046] A circulating pump 6 is used to circulate the wastewater concentrate between the crystallization tank 4 and the refrigeration heat exchanger 5. The inlet of the circulating pump 6 is connected to the outlet of the crystallization tank 4, the outlet of the circulating pump 6 is connected to the inlet of the refrigeration heat exchanger 5, and the outlet of the refrigeration heat exchanger 5 is connected to the inlet of the crystallization tank 4.

[0047] Centrifuge 7 is used to perform solid-liquid separation on the high-salt wastewater concentrate at the bottom of crystallization tank 4. The inlet of centrifuge 7 is connected to the concentrate outlet at the bottom of crystallization tank 4.

[0048] In this invention, the concentrated wastewater first enters the inlet tank, where it is pre-cooled by a heat exchanger, initially lowering its temperature. Then, a water pump pumps the concentrated wastewater into a crystallization tank, where a circulation pump sends it to a refrigeration heat exchanger for further cooling. The cooled wastewater then flows back to the crystallization tank, and this cycle continues until the temperature is lowered to approximately -5°C. This further precipitates the salts in the concentrated wastewater. The precipitated salts are then separated in the crystallization tank; the clearer liquid at the top overflows through an overflow pipe, while the lower portion, with higher salt content, is pumped to a centrifuge for solid-liquid separation. This method results in relatively high wastewater treatment efficiency and a relatively good treatment effect.

[0049] The inlet tank 1 described in this invention includes an inlet tank body 101. A first stirring shaft 102 is provided inside the inlet tank body 101. The upper end of the first stirring shaft 102 is connected to a first stirring motor 103 located at the upper end of the inlet tank body 101. A plurality of first stirring elements 104 are spaced apart on the first stirring shaft 102. In this invention, the first stirring motor 103 drives the first stirring elements 104 to rotate, which allows the wastewater concentrate to be stirred in the inlet tank body 101. This enables the wastewater concentrate that has been pre-cooled by the pre-cooling heat exchanger 2 and flows back into the inlet tank 1 to be quickly mixed with the wastewater concentrate originally stored in the inlet tank 1, thereby achieving rapid pre-cooling of the entire wastewater concentrate.

[0050] One embodiment of the first stirring element 104 described in this utility model includes stirring rods 1041 symmetrically arranged on both sides of the first stirring shaft 102, and stirring blades 1042 arranged on the upper and / or lower sides of the stirring rods 1041. To further improve the stirring effect, adjacent first stirring elements 104 can be arranged perpendicularly. When the first stirring shaft 102 rotates, the perpendicularly arranged first stirring elements 104 can cause the concentrated wastewater inside the inlet tank 101 to be stirred in different directions, thereby making the stirring more thorough.

[0051] This invention features a first outlet pipe 8 at the lower part of the inlet tank 1, which is connected to the inlet end of a feed pump 9. The outlet end of the feed pump 9 is connected to the inlet end of the precooling heat exchanger 2. In this invention, the feed pump 9 can send the concentrated wastewater from the inlet tank 1 into the precooling heat exchanger 2 for precooling. The precooled concentrated wastewater is then returned to the inlet tank 1 from the outlet end of the precooling heat exchanger 2. This invention allows for one precooling cycle or multiple precooling cycles.

[0052] The crystallization tank 4 of this utility model includes a base 41, a crystallization tank body 42 mounted on the base 41, an overflow pipe 43 at the upper part of the crystallization tank body 42, a second stirring shaft 44 inside the crystallization tank body 42, the second stirring shaft 44 being connected to a second stirring motor 45 mounted at the upper end of the crystallization tank body 42, a second stirring element 46 at the lower end of the second stirring shaft 44, a water inlet pipe 47 and a second water outlet pipe 48 at the upper part of the crystallization tank body 42, and a third water outlet pipe 415 at the lower part of the crystallization tank body 42, the third water outlet pipe 415 being connected to the inlet end of a concentrate pump, and the outlet end of the concentrate pump being connected to the feed end of a centrifuge 7.

[0053] In this invention, the wastewater concentrate is cooled by an external refrigeration heat exchanger. Due to the lower temperature, some of the salt in the liquid precipitates out, and the salt settles and concentrates in the crystallization tank due to gravity, increasing the salt concentration. The concentrated liquid is then pumped away by a bottom concentrate pump to proceed to the next process. An overflow pipe 43 is located at the top of the crystallization tank, through which the supernatant flows by gravity to the next process. To prevent salt from accumulating and clumping at the bottom, a second agitator 46 slowly stirs the bottom, making it easier for the concentrate pump to remove it.

[0054] In this invention, a plurality of reinforcing rings 413 are spaced apart on the outer wall of the crystallization tank body 42. The reinforcing rings 413 can effectively increase the overall strength of the crystallization tank body 42.

[0055] In this invention, an annular step 49 is provided inside the crystallization tank body 42, and an annular baffle 410 is provided on the inner side of the annular step 49. The annular step 49, the annular baffle 410, and the crystallization tank body 42 together form an overflow channel, and the overflow pipe 43 is connected to the overflow channel. Annular teeth 411 are provided at the upper end of the annular baffle 410. In this invention, the supernatant slowly flows into the overflow channel from between the teeth of the annular teeth 411, and then is discharged from the overflow pipe 43. This effectively reduces the carryover of liquids with high salinity or other impurities.

[0056] In this invention, a central sleeve 10 is provided inside the upper part of the crystallization tank body 42. The second stirring shaft 44 is disposed in the central sleeve 10, and a flow guiding channel is formed between the inner wall of the central sleeve 10 and the outer wall of the second stirring shaft 44. The lower end of the central sleeve 10 extends into the lower part of the crystallization tank body 42, and the second water outlet pipe 48 is connected to the middle part of the central sleeve 10. In this invention, a funnel-shaped opening is provided in the central sleeve 10. The lower outer wall of the central sleeve 10 is connected to the inner wall of the crystallization tank body 42 by a bracket 414, and the central sleeve 10 is disposed inside the upper end of the crystallization tank body 42 by a mounting bracket. In this invention, the central sleeve 10 effectively prevents the liquid in the upper part of the crystallization tank body 42 from being agitated during the rotation of the second stirring shaft 44, thus providing favorable conditions for the precipitation and concentration of salt in the liquid. The second stirring element 46 slowly stirs the bottom, effectively preventing the salt from accumulating and agglomerating at the bottom, making it easier for the concentrate pump to remove it.

[0057] One embodiment of the second stirring member 46 described in this utility model includes a first stirring crossbar 461 and a second stirring crossbar 462 arranged at intervals from top to bottom on the outer wall of the lower end of the second stirring shaft 44. The length of the first stirring crossbar 461 is greater than the length of the second stirring crossbar 462. A stirring inclined bar 463 is provided between the end of the first stirring crossbar 461 and the end of the second stirring crossbar 462.

[0058] To further improve the mixing effect, stirring blades may also be provided on the stirring slant bar 463 and the first stirring crossbar 461 or / and the second stirring crossbar 462, respectively.

[0059] In this invention, a drain outlet 412 is also provided on the lower outer wall of the crystallization tank body 42. The drain outlet 412 is connected to a drain pipe.

[0060] The refrigeration heat exchanger 5 described in this utility model is connected to the refrigeration unit 11.

[0061] The water inlet tank 1, precooling heat exchanger 2, water pump 3, refrigeration heat exchanger 5, and circulation pump 6 of this utility model are all housed within the first mounting frame 12, while the centrifuge 7 is housed within the second mounting frame 13. This utility model has a simple structure, with the system consisting of a water inlet tank, precooling heat exchanger, water pump, crystallizer, refrigeration heat exchanger, circulation pump, and centrifuge. The modular design divides the entire system into four main parts: ① centrifuge and second mounting frame, ② crystallizer, ③ water inlet tank, precooling heat exchanger, water pump, refrigeration heat exchanger, circulation pump and first mounting frame, and ④ refrigeration unit. The modular design makes transportation more convenient and installation faster, greatly improving on-site deployment and relocation capabilities.

[0062] This invention provides a collection hopper 14 located below the discharge port of the centrifuge 7. The collection hopper 14 facilitates the collection of waste residue generated by the centrifuge 7.

[0063] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A novel refrigeration system for sewage treatment, characterized by: The application relates to a sewage concentration liquid treatment device which comprises a water inlet tank (1), a precooling heat exchanger (2), a water pump (3), a crystallization tank (4), a refrigeration heat exchanger (5), a circulating pump (6) and a centrifugal machine (7). The water inlet tank (1) is used for storing sewage concentration liquid. The precooling heat exchanger (2) is used for precooling and cooling the sewage concentration liquid in the water inlet tank (1), the water outlet end of the water inlet tank (1) is connected with the water inlet end of the precooling heat exchanger (2), and the water outlet end of the precooling heat exchanger (2) is connected with the water inlet end of the water inlet tank (1). The water pump (3) is used for sending the sewage concentration liquid in the water inlet tank (1) into the crystallization tank (4). The crystallization tank (4) is used for separating and precipitating the salt in the sewage concentration liquid. The refrigeration heat exchanger (5) is used for cooling and cooling the sewage concentration liquid in the crystallization tank (4). The circulating pump (6) is used for circulating and conveying the sewage concentration liquid between the crystallization tank (4) and the refrigeration heat exchanger (5), the water inlet end of the circulating pump (6) is connected with the water outlet end of the crystallization tank (4), the water outlet end of the circulating pump (6) is connected with the water inlet end of the refrigeration heat exchanger (5), and the water outlet end of the refrigeration heat exchanger (5) is connected with the water inlet end of the crystallization tank (4). The centrifugal machine (7) is used for separating solid and liquid of the sewage concentration liquid with high salt content in the lower part of the crystallization tank (4), and the water inlet end of the centrifugal machine (7) is connected with the concentration liquid outlet in the lower part of the crystallization tank (4).

2. A novel freezing system for sewage treatment as claimed in claim 1, wherein: The water inlet tank (1) comprises a water inlet tank body (101), a first stirring shaft (102) is arranged in the water inlet tank body (101), the upper end of the first stirring shaft (102) is connected with a first stirring motor (103) arranged at the upper end of the water inlet tank body (101), and a plurality of first stirring pieces (104) are arranged on the first stirring shaft (102) at intervals.

3. A novel freezing system for sewage treatment as claimed in claim 2, wherein: The first stirring pieces (104) are vertically arranged between two adjacent first stirring pieces (104).

4. A novel freezing system for sewage treatment as claimed in claim 1, wherein: A first water outlet pipe (8) is arranged at the lower part of the water inlet tank (1), the first water outlet pipe (8) is connected with the feeding end of a feeding pump (9), and the discharging end of the feeding pump (9) is connected with the water inlet end of the precooling heat exchanger (2).

5. A novel freezing system for sewage treatment as claimed in claim 1, wherein: The crystallization tank (4) comprises a base (41), a crystallization tank body (42) is arranged on the base (41), an overflow pipe (43) is arranged at the upper part of the crystallization tank body (42), a second stirring shaft (44) is arranged in the crystallization tank body (42), the second stirring shaft (44) is connected with a second stirring motor (45) arranged at the upper end of the crystallization tank body (42), a second stirring piece (46) is arranged at the lower end of the second stirring shaft (44), a water inlet pipe (47) and a second water outlet pipe (48) are arranged at the upper part of the crystallization tank body (42).

6. A novel freezing system for sewage treatment as claimed in claim 5 wherein: An annular step (49) is arranged in the crystallization tank body (42), an annular baffle (410) is arranged on the inner side of the annular step (49), the annular step (49), the annular baffle (410) and the crystallization tank body (42) jointly form an overflow channel, and the overflow pipe (43) is connected with the overflow channel.

7. A novel freezing system for sewage treatment as claimed in claim 6 wherein: An annular tooth (411) is arranged at the upper end of the annular baffle (410).

8. A novel freezing system for sewage treatment as claimed in any one of claims 5 to 7, wherein: A central sleeve (10) is arranged in the upper part of the crystallization tank body (42), the second stirring shaft (44) is arranged in the central sleeve (10), and a flow guide channel is formed between the inner wall of the central sleeve (10) and the outer wall of the second stirring shaft (44), The lower end of the central sleeve (10) extends into the lower part of the crystallization tank body (42), and the second water outlet pipe (48) is connected with the middle part of the central sleeve (10).

9. A novel freezing system for sewage treatment as claimed in claim 8, wherein: The refrigeration heat exchanger (5) is connected with a refrigerator (11).

10. A novel freezing system for sewage treatment as claimed in claim 1, wherein: The water inlet tank (1), the pre-cooling heat exchanger (2), the water pump (3), the refrigeration heat exchanger (5) and the circulating pump (6) are arranged in the first mounting rack (12), and the centrifugal machine (7) is arranged in the second mounting rack (13).

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