Concentration and evaporation device for separation treatment of high-concentration wastewater

Abstract

The utility model belongs to the technical field of industrial wastewater treatment, and discloses a concentration and evaporation device for high-concentration wastewater separation treatment, which comprises a low-temperature evaporator and further comprises an evaporation structure arranged on the low-temperature evaporator and used for carrying out distillation treatment on waste liquid; the backflow assembly is arranged at the bottom of the low-temperature evaporator and is used for promoting water evaporation by circulating the concentrated solution; wherein the evaporation structure comprises a raw water inlet, a defoaming agent inlet and a cleaning water inlet, the raw water inlet, the defoaming agent inlet and the cleaning water inlet all communicate with one side of the low-temperature evaporator, and filtering components are arranged between the raw water inlet, the defoaming agent inlet and the cleaning water inlet and the low-temperature evaporator; and the low-temperature evaporator is connected with a vacuum cooling system through a pipeline. Concentrated liquid at the bottom of the low-temperature evaporator flows back to the upper part through the circulating discharge pump, hydraulic turbulent flow of membrane filtrate at the bottom of the low-temperature evaporator is realized, and crystallization of the concentrated liquid is effectively slowed down.

Description

Technical Field

[0001] The utility model belongs to the technical field of industrial wastewater treatment, in particular to a concentration and evaporation device for separation and treatment of high-concentration wastewater. Background Art

[0002] At present, the mainstream process route for achieving deep treatment and zero discharge of high-concentration industrial wastewater is: physical and chemical treatment => biochemical treatment => membrane separation => concentrated liquid evaporation disposal. Concentration and reduction is a necessary step in the disposal of concentrated liquid in membrane separation treatment. Currently, the technologies that can be used for concentration and reduction of concentrated liquid in membrane separation treatment include evaporation, membrane distillation, electrodialysis, etc.

[0003] Compared with other evaporation processes, low-temperature evaporation technology has the characteristics of low energy consumption, low processing cost, and high disposal efficiency. It is currently the most widely used in engineering applications. However, during the evaporation process, as the waste liquid continues to concentrate and contains a certain amount of crystals, it is easy to induce crystallization or scaling, block the evaporator and pipelines, reduce heat transfer efficiency, affect the discharge of treated products, and shorten the working life of the evaporation device. In the existing technology, the control of scaling mainly adopts physical descaling and the addition of scale inhibitors. The addition of scale inhibitors requires the addition of chemical agents to the concentrated liquid to be treated. The treatment process is complicated and costly. The maintenance cost of physical scale inhibition is high, and there are not many practical applications. Utility Model Content

[0004] In order to solve the problems raised in the above background technology, the utility model provides a concentration and evaporation device for separating and treating high-concentration wastewater, which has the advantage of avoiding blockage of the evaporator caused by crystallization of concentrated liquid.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a concentration and evaporation device for separating and treating high-concentration wastewater, comprising a low-temperature evaporator, and also comprising:

[0006] An evaporation structure, which is arranged on the low-temperature evaporator and is used for distillation treatment of waste liquid;

[0007] A reflux assembly is disposed at the bottom of the low-temperature evaporator and is used to circulate the concentrated liquid to promote water evaporation;

[0008] Wherein, the evaporation structure includes a raw water inlet, a defoaming agent inlet and a washing water inlet, the raw water inlet, the defoaming agent inlet and the washing water inlet are all connected to one side of the low-temperature evaporator, a filtering component is arranged between the raw water inlet, the defoaming agent inlet and the washing water inlet and the low-temperature evaporator, the low-temperature evaporator is connected to a vacuum cooling system through a pipeline, the outside of the vacuum cooling system is connected to a distilled water outlet, the vacuum cooling system is connected to a heat exchange coil through a heat pump compressor, and the vacuum cooling system is connected to a vacuum heating device through a pipeline;

[0009] Among them, the reflux component includes a concentrated liquid outlet, which is connected to the bottom of the low-temperature evaporator through a pipeline, and a circulating discharge pump and a drain valve are arranged on the concentrated liquid outlet. The water supply port of the circulating discharge pump is connected to the low-temperature evaporator through a pipeline, and an internal circulation valve and a decontamination component are arranged on the water supply pipeline of the circulating discharge pump.

[0010] Preferably, the decontamination component includes a fixed pipe, which is connected to the water supply pipeline of the circulation discharge pump and the low-temperature evaporator, a driving device is installed at the bottom of the fixed pipe, a spiral blade is installed on the output shaft of the driving device, a baffle is installed on the top of the fixed pipe, a plurality of filter holes are opened on the blades of the spiral blade, and a discharge trough is opened between the fixed pipe and the baffle.

[0011] Preferably, there is a gap between the spiral blade and the fixed tube.

[0012] Preferably, a filter component is provided between the raw water inlet, the defoaming agent inlet and the cleaning water inlet and the low-temperature evaporator, and the heat exchange coil is installed inside the low-temperature evaporator.

[0013] Preferably, the bottom of the baffle is provided with a chamfer.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0015] The utility model allows the refrigerant of the heat pump compressor circuit to flow into the heat exchange coil, the liquid to be treated contacts the heat exchange coil and is heated to boil, the steam rises along the pipeline into the vacuum cooling system to exchange heat with the refrigerant of the heat pump compressor, the water is evaporated quickly under the negative pressure vacuum state, and the refrigerant absorbs heat and refrigerates after being gasified, the steam is cooled and liquefied to become distilled water, and the high boiling point components of the sewage are gathered at the bottom of the low-temperature evaporator in the form of concentrated liquid, and a circulating discharge pump is arranged below the low-temperature evaporator, and the concentrated liquid at the bottom of the low-temperature evaporator is refluxed to the upper part by the circulating discharge pump, so as to realize hydraulic turbulence on the membrane filtrate at the bottom of the low-temperature evaporator, and effectively slow down the crystallization of the concentrated liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the disassembly structure of the decontamination component of the utility model.

[0018] In the figure: 1. low-temperature evaporator; 2. raw water inlet; 3. defoaming agent inlet; 4. cleaning water inlet; 5. heat exchange coil; 6. vacuum cooling system; 7. distilled water outlet; 8. heat pump compressor; 9. vacuum heating device; 10. circulation discharge pump; 11. internal circulation valve; 12. drain valve; 13. concentrate outlet; 14. decontamination component; 141. fixed pipe; 142. driving device; 143. spiral blade; 144. baffle; 145. filter hole; 146. discharge trough; 15. filter component. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] like Figure 1 to Figure 2 As shown, the utility model provides a concentration and evaporation device for separating and treating high-concentration wastewater, comprising a low-temperature evaporator 1, and also comprising:

[0021] An evaporation structure, which is arranged on the low-temperature evaporator 1 and is used for distillation treatment of waste liquid;

[0022] A reflux assembly, which is arranged at the bottom of the low-temperature evaporator 1 and is used to circulate the concentrated liquid to promote water evaporation;

[0023] The evaporation structure includes a raw water inlet 2, a defoaming agent inlet 3 and a cleaning water inlet 4, which are all connected to one side of the low-temperature evaporator 1. The low-temperature evaporator 1 is connected to a vacuum cooling system 6 through a pipeline, and the outside of the vacuum cooling system 6 is connected to a distilled water outlet 7. The vacuum cooling system 6 is connected to a heat exchange coil 5 through a heat pump compressor 8, and the vacuum cooling system 6 is connected to a vacuum heating device 9 through a pipeline.

[0024] Among them, the reflux component includes a concentrated liquid outlet 13, which is connected to the bottom of the low-temperature evaporator 1 through a pipeline, and a circulating discharge pump 10 and a drain valve 12 are arranged on the concentrated liquid outlet 13. The water supply port of the circulating discharge pump 10 is connected to the low-temperature evaporator 1 through a pipeline, and an internal circulation valve 11 and a decontamination component 14 are arranged on the water supply pipeline of the circulating discharge pump 10.

[0025] The effluent after membrane filtration is fed into the low-temperature evaporator 1 by the feed pump, and the refrigerant in the heat pump compressor 8 circuit flows into the heat exchange coil 5. The liquid to be treated contacts the heat exchange coil 5 and is heated to boil. The steam rises along the pipeline and enters the vacuum cooling system 6 to exchange heat with the refrigerant of the heat pump compressor 8. The water evaporates quickly under negative pressure vacuum. At the same time, the refrigerant absorbs heat and refrigerates after gasification. The steam becomes distilled water after being cooled and liquefied. The high-boiling point components of the sewage are gathered at the bottom of the low-temperature evaporator 1 in the form of concentrated liquid. A circulating discharge pump 10 is arranged below the low-temperature evaporator 1. The concentrated liquid at the bottom of the low-temperature evaporator 1 is refluxed to the upper part by the circulating discharge pump 10, and hydraulic turbulence is achieved for the membrane filtrate at the bottom of the low-temperature evaporator 1, which effectively slows down the crystallization of the concentrated liquid. At the same time, the solution in the low-temperature evaporator 1 is forced to circulate to reduce the temperature difference loss and promote the evaporation of water. After the treatment is completed, the circulating discharge pump 10 is turned off, and the treated concentrated liquid is discharged from the system through the outlet pump.

[0026] Among them, the decontamination component 14 includes a fixed pipe 141, which is connected to the water supply pipeline of the circulation discharge pump 10 and the low-temperature evaporator 1. A driving device 142 is installed at the bottom of the fixed pipe 141, and a spiral blade 143 is installed on the output shaft of the driving device 142. A baffle 144 is installed on the top of the fixed pipe 141. A plurality of filter holes 145 are opened on the blades of the spiral blade 143, and a discharge trough 146 is opened between the fixed pipe 141 and the baffle 144.

[0027] Through the design of the decontamination component 14, when the concentrated liquid enters the interior of the fixed tube 141, the operation of the driving device 142 will cause the spiral blade 143 to rotate. At this time, due to the filter holes 145 set on the spiral blade 143 and the gap between the spiral blade 143 and the fixed tube 141, the liquid will flow downward and return to the interior of the low-temperature evaporator 1, and the crystals in the liquid will move upward with the rotation of the spiral blade 143. When the crystals move upward to the top, they will squeeze the chamfer of the baffle 144, so that the crystals move to both sides for easy discharge from the discharge trough 146, thereby preventing the concentrated liquid from scaling and clogging.

[0028] There is a gap between the spiral blade 143 and the fixed tube 141 .

[0029] Through the gap between the spiral blade 143 and the fixed pipe 141 , when the spiral blade 143 rotates, the liquid will flow outwards, and the solid will be transported upwards.

[0030] A filter component 15 is provided between the raw water inlet 2 , the defoaming agent inlet 3 , the cleaning water inlet 4 and the low-temperature evaporator 1 , and the heat exchange coil 5 is installed inside the low-temperature evaporator 1 .

[0031] By arranging the filter member 15 between the raw water inlet 2, the defoamer inlet 3 and the washing water inlet 4 and the low-temperature evaporator 1, crystals can be intercepted during feeding, thereby reducing the probability of crystallization after feeding.

[0032] The bottom of the baffle 144 is chamfered.

[0033] Through the design of the baffle 144 , when the spiral blade 143 transports the crystals upward, the crystals will be squeezed against the chamfer of the baffle 144 , so that the crystals can be squeezed out of the discharge chute 146 .

[0034] The working principle and use process of this utility model:

[0035] The feed pump carries the effluent after membrane filtration into the low-temperature evaporator 1, and the refrigerant in the heat pump compressor 8 circuit flows into the heat exchange coil 5. The liquid to be treated contacts the heat exchange coil 5 and is heated and boiled. The steam rises along the pipeline and enters the vacuum cooling system 6 to exchange heat with the refrigerant of the heat pump compressor 8. The water evaporates quickly under the negative pressure vacuum state. At the same time, the refrigerant absorbs heat and refrigerates after gasification. The steam becomes distilled water after being cooled and liquefied. The high-boiling point components of the sewage are gathered at the bottom of the low-temperature evaporator 1 in the form of concentrated liquid. A circulating discharge pump 10 is arranged below the low-temperature evaporator 1. The concentrated liquid at the bottom of the low-temperature evaporator 1 is refluxed to the upper part through the circulating discharge pump 10, so as to realize hydraulic turbulence on the membrane filtrate at the bottom of the low-temperature evaporator 1, and effectively slow down the concentrated liquid At the same time, when the concentrated liquid enters the fixed tube 141, the operation of the driving device 142 will cause the spiral blade 143 to rotate. At this time, due to the filtering holes 145 set on the spiral blade 143 and the gap between the spiral blade 143 and the fixed tube 141, the liquid will flow downward and return to the interior of the low-temperature evaporator 1, and the crystals in the liquid will move upward with the rotation of the spiral blade 143. When the crystals move upward to the top, they will squeeze the chamfer of the baffle 144, so that the crystals move to both sides for easy discharge from the discharge trough 146, so as to reduce the temperature difference loss and promote the evaporation of water. After the treatment is completed, the circulation discharge pump 10 is turned off, and the treated concentrated liquid is discharged from the system through the outlet pump.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A concentration and evaporation device for separating and treating high-concentration wastewater, comprising a low-temperature evaporator (1), characterized in that: Also includes: An evaporation structure, which is arranged on the low-temperature evaporator (1) and is used for distilling the waste liquid; A reflux component, which is arranged at the bottom of the low-temperature evaporator (1) and is used to circulate the concentrated liquid to promote water evaporation; The evaporation structure comprises a raw water inlet (2), a defoaming agent inlet (3) and a cleaning water inlet (4); the raw water inlet (2), the defoaming agent inlet (3) and the cleaning water inlet (4) are all connected to one side of the low-temperature evaporator (1); a filter component (15) is provided between the raw water inlet (2), the defoaming agent inlet (3) and the cleaning water inlet (4) and the low-temperature evaporator (1); the low-temperature evaporator (1) is connected to a vacuum cooling system (6) through a pipeline; the outside of the vacuum cooling system (6) is connected to a distilled water outlet (7); the vacuum cooling system (6) is connected to a heat exchange coil (5) through a heat pump compressor (8); and the vacuum cooling system (6) is connected to a vacuum heating device (9) through a pipeline; The reflux component comprises a concentrated liquid outlet (13), the concentrated liquid outlet (13) is connected to the bottom of the low-temperature evaporator (1) through a pipeline, a circulating discharge pump (10) and a drain valve (12) are arranged on the concentrated liquid outlet (13), a water delivery port of the circulating discharge pump (10) is connected to the low-temperature evaporator (1) through a pipeline, and an internal circulation valve (11) and a decontamination component (14) are arranged on the water delivery pipeline of the circulating discharge pump (10).

2. A concentration and evaporation device for separation and treatment of high-concentration wastewater according to claim 1, characterized in that: The decontamination component (14) comprises a fixed pipe (141), the fixed pipe (141) being connected to a water delivery pipe of a circulating discharge pump (10) and a low-temperature evaporator (1), a driving device (142) being installed at the bottom of the fixed pipe (141), a spiral blade (143) being installed on the output shaft of the driving device (142), a baffle (144) being installed at the top of the fixed pipe (141), a plurality of filtering holes (145) being provided on the blades of the spiral blade (143), and a discharge trough (146) being provided between the fixed pipe (141) and the baffle (144).

3. A concentration and evaporation device for separation and treatment of high-concentration wastewater according to claim 2, characterized in that: There is a gap between the spiral blade (143) and the fixed tube (141).

4. A concentration and evaporation device for separation and treatment of high-concentration wastewater according to claim 2, characterized in that: A filter component (15) is provided between the raw water inlet (2), the defoaming agent inlet (3), the cleaning water inlet (4) and the low-temperature evaporator (1), and the heat exchange coil (5) is installed inside the low-temperature evaporator (1).

5. The concentration and evaporation device for separation and treatment of high-concentration wastewater according to claim 2, characterized in that: The bottom of the baffle (144) is provided with a chamfer.

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