A surface vacuum evaporation concentration device for treating oily wastewater

Abstract

The application provides a surface vacuum evaporation concentration device for treating oily wastewater, and relates to the technical field of oily wastewater treatment. The device comprises a vacuum cavity and an evaporator. The upper side of the vacuum cavity is provided with a wastewater inlet. The side of the vacuum cavity is provided with a steam outlet. The lower side of the vacuum cavity is provided with a concentrated liquid outlet. The inner upper side of the vacuum cavity is provided with a liquid distribution spraying assembly. The inner lower side of the vacuum cavity is provided with an evaporation assembly. The corrugated evaporation plate is provided with a plurality of wave crests and wave troughs on the surface, so that the surface area of the corrugated evaporation plate can be increased. In the heat exchange process, the wastewater can be fully contacted with the corrugated evaporation plate, and the evaporation efficiency is improved. The driving motor is started, and the receiving platform is driven to rotate, so that the oil stains on the surface of the receiving platform are thrown outwards, and the evaporation efficiency is not affected by the accumulation of oil stains.

Description

Technical Field

[0001] The present invention relates to the technical field of oily wastewater treatment, in particular to a surface vacuum evaporation and concentration device for treating oily wastewater. Background Art

[0002] Oily wastewater contains pollutants such as mineral oil, emulsified oil and suspended solids. Direct discharge will cause serious water pollution. Traditional evaporation and concentration technology has the following defects:

[0003] High temperature and high energy consumption: Normal pressure evaporation requires heating the wastewater to above 100°C, which consumes a lot of energy and easily causes oxidation and denaturation of the oil;

[0004] Low mass transfer efficiency: The gas-liquid contact area on the flat evaporation surface is limited, and the evaporation rate is slow;

[0005] Equipment is prone to scaling: solid impurities and oil in wastewater are easily deposited on the evaporation surface, reducing heat transfer efficiency and increasing maintenance costs;

[0006] While existing vacuum evaporation technology can lower evaporation temperatures, it lacks effective design for optimizing the evaporation surface structure and recycling heat, making it difficult to simultaneously meet the requirements for high efficiency and anti-scaling. Therefore, there is an urgent need for a low-temperature vacuum evaporation and concentration device that combines efficient mass transfer with anti-scaling properties. Summary of the Invention

[0007] In view of the shortcomings of the existing technology, the present invention provides a surface vacuum evaporation and concentration device for treating oily wastewater, which solves the problem that impurities and oils will be deposited on the evaporation surface of the existing evaporation device during a long evaporation process, thereby reducing the evaporation efficiency.

[0008] To achieve the above object, the technical solution adopted by the present invention is:

[0009] The utility model provides a kind of surface vacuum evaporation concentration device for treating oily wastewater, including vacuum cavity and evaporator, the upper side of the vacuum cavity is provided with wastewater inlet, the side of the vacuum cavity is provided with steam outlet, the lower side of the vacuum cavity is provided with concentrated liquid outlet, the inside upper side of the vacuum cavity is provided with liquid distribution spray assembly, the inside lower side of the vacuum cavity is provided with evaporation component, the steam outlet is connected shell and tube heat exchanger by pipeline sealing, the shell side inlet of the shell and tube heat exchanger is connected cooling water inlet, the tube side outlet and shell side outlet of the shell and tube heat exchanger are connected condensate outlet and cooling water outlet respectively, the condensate outlet is connected vacuum pump by pipeline, the condensate outlet and cooling water outlet are connected plate heat exchanger water inlet by pipeline, the plate heat exchanger water outlet is connected circulation pump one end, the other end of the circulation pump is connected cooling water inlet by pipeline, the evaporator is connected heat pump compressor, the heat pump compressor is connected shell side inlet of shell and tube condenser, the tube side inlet of the shell and tube condenser is connected heat conducting oil channel one end, the shell side outlet of the shell and tube condenser is connected throttling valve, the throttling valve is connected with evaporator, the bottom of the vacuum cavity is provided with conical oil collection tank for collecting oil dirt.

[0010] As preferred, the evaporation component includes a rotating column, the bottom of the vacuum cavity is fixedly installed with an adapter seat, the rotating column is rotatably installed on the upper end of the adapter seat, double-end mechanical seal is used between the extension pipe and the rotating column, the sealing cavity is filled with high-temperature-resistant lubricating grease, the upper end of the rotating column is installed with a receiving platform, the upper surface of the receiving platform is provided with corrugated evaporation plates, and the surface of the corrugated evaporation plates is provided with a super-hydrophilic coating.

[0011] As preferred, a circulation channel is formed in the receiving platform, a partition plate is installed in the circulation channel through a connecting seat, a first oil inlet channel and a first oil outlet channel are respectively arranged in the rotating column, the first oil inlet channel is in communication with the center of the partition plate, and the first oil outlet channel is in communication with the outer periphery of the partition plate.

[0012] As preferred, an extension pipe is arranged at the lower end of the adapter seat, an oil inlet pipe is arranged in the middle of the extension pipe, an oil outlet pipe is arranged outside the extension pipe, the oil inlet pipe is combined with the first oil inlet channel and communicates with each other, and the oil outlet pipe is combined with the first oil outlet channel and communicates with each other.

[0013] As preferred, the heat conducting oil channel is composed of a second oil inlet channel and a second oil outlet channel, the two ends of the second oil inlet channel are respectively connected with the oil inlet pipe and the oil inlet end of the shell and tube condenser, the two ends of the second oil outlet channel are respectively connected with the oil outlet pipe and the oil outlet end of the shell and tube condenser, and a delivery pump is arranged in the middle of the heat conducting oil channel.

[0014] As preferred, the corrugated evaporation plate comprises a plurality of wave crests and wave troughs, the wave crests and wave troughs are arranged alternately, and an annular protrusion is arranged at the outer periphery of the corrugated evaporation plate.

[0015] As preferred, a plurality of arc-shaped flow channels are arranged at the outer side of the upper surface of the receiving platform, one end of each arc-shaped flow channel is connected with the annular protrusion, and the other end of each arc-shaped flow channel penetrates the receiving platform.

[0016] As preferred, a sealing installation cover is fixedly installed at the inner upper side of the vacuum cavity, a driving motor is fixedly installed in the sealing installation cover, and the output end of the driving motor is fixedly connected with the center of the lower receiving platform.

[0017] As preferred, the liquid distribution and spraying assembly comprises a fixed support, the fixed support is fixedly installed at the outer side of the sealing installation cover, a liquid storage disc is arranged at the bottom of the fixed support, and a plurality of spraying heads are arranged at the lower surface of the liquid storage disc.

[0018] As preferred, a sealing hose is arranged at one side of the liquid storage disc, the sealing hose is sealingly connected with the wastewater inlet, a liquid level sensor and a temperature sensor are sealingly installed at one side of the vacuum cavity, and sealing valves are arranged in the concentrated liquid outlet and the wastewater inlet.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] 1. The heat conducting oil channel is composed of two pipelines, so that the oil inlet pipeline and the oil outlet pipeline can be connected in series with the shell and tube condenser to form a closed loop channel, so that the internal heat conducting oil can be continuously circulated under the action of the starting conveying pump, and the stable heat conducting oil circulation can be ensured during the rotation of the receiving platform through the adapter, the rotating column and the first oil inlet channel adapter.

[0021] 2、By the corrugated evaporation plate surface is provided with a number of peaks and troughs, so that the corrugated evaporation plate can increase the surface area, in the heat exchange process can make the wastewater can fully contact with the corrugated evaporation plate, improve its evaporation efficiency, and utilize in the receiving platform outside is provided with a number of arc flow channel, so that the waste water can be thrown out from the arc flow channel inside flow to reduce the speed of the waste water is thrown out, avoid the problem of the internal water of the waste water is not completely evaporated to cause the concentration performance to decline, finally the separated oil dirt will be thrown out along the arc flow channel, and stored in the vacuum cavity bottom realizes the oil water separation of waste water, the corrugated evaporation plate as the concentrated evaporation surface, because of the residual oil dirt and other impurities in the wastewater, will cause the oil dirt to accumulate on the surface of the corrugated evaporation plate in the continuous evaporation process, and will cause the distance between the subsequent wastewater and the surface of the corrugated evaporation plate to gradually increase and thus affect the evaporation efficiency, therefore, the application is driven by the driving motor, under the driving of the output end, so that the oil dirt on the surface of the receiving platform is thrown out, avoiding the influence of the evaporation efficiency caused by the accumulation of oil dirt.

[0022] 3、Through the sealing hose is sealed with the waste water inlet, can connect the external waste water conveying equipment to realize the stable conveying of waste water, under the action of the sealing hose, the waste water will fill the liquid storage disc and make a plurality of spray heads respectively carry out liquid distribution operation, so that the waste water is uniformly distributed on the surface of the corrugated evaporation plate, and forms a liquid film, realizes rapid evaporation, wherein the temperature sensor can be connected with the speed of the vacuum pump and the conveying pump through the PLC control system, to maintain stable vacuum degree and evaporation temperature, and when the oil dirt storage is too much, the liquid level sensor can control the external equipment to discharge the oil dirt from the concentrated liquid outlet through the PLC control system, to avoid the problem of affecting the subsequent evaporation efficiency caused by the excessive storage of oil dirt. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the overall structure schematic diagram of the application;

[0024] Figure 2 It is the three-dimensional structure schematic diagram of the vacuum cavity;

[0025] Figure 3 It is another view three-dimensional structure schematic diagram of the vacuum cavity;

[0026] Figure 4 It is the overhead structure schematic diagram of the vacuum cavity;

[0027] Figure 5 It is Figure 4 A-A section structure schematic diagram in the

[0028] Figure 6 It is the internal three-dimensional structure schematic diagram of the vacuum cavity;

[0029] Figure 7is another perspective view of the internal three-dimensional structure of the vacuum cavity;

[0030] Figure 8 is a top view of the internal structure of the vacuum cavity;

[0031] Figure 9 is Figure 8 is a sectional view of the internal structure at B-B;

[0032] Figure 10 is a three-dimensional view of the evaporation assembly;

[0033] Figure 11 is a top view of the evaporation assembly;

[0034] Figure 12 is Figure 11 is a sectional view of the internal structure at C-C;

[0035] Figure 13 is a front view of the evaporation assembly;

[0036] Figure 14 is Figure 13 is a sectional view of the internal structure at D-D;

[0037] Figure 15 is a cross-sectional view of the corrugated evaporation plate.

[0038] In the figure: 1, vacuum cavity; 101, wastewater inlet; 102, steam outlet; 103, concentrated liquid outlet; 104, conical oil collection groove; 2, liquid level sensor; 3, evaporation assembly; 301, receiving platform; 3011, wave crest; 3012, wave trough; 3013, annular protrusion; 3014, arc-shaped flow channel; 3015, corrugated evaporation plate; 302, rotating column; 3021, first oil inlet channel; 3022, adapter seat; 3023, extension pipe; 3024, oil outlet pipeline; 3025, oil inlet pipeline; 3026, first oil outlet channel; 303, drive motor; 304, circulation channel; 305, partition plate; 3051, connecting seat; 306, super-hydrophilic coating; 4, heat-conducting oil pipeline; 401, delivery pump; 402, second oil inlet channel; 403, second oil outlet channel; 5, sealing mounting cover; 6, liquid distribution spray assembly; 601, fixed support; 602, liquid storage disc; 603, sealing hose; 604, spray head; 7, shell-and-tube heat exchanger; 8, vacuum pump; 9, cooling water outlet; 10, cooling water inlet; 11, evaporator; 12, heat pump compressor; 13, shell-and-tube condenser; 14, plate heat exchanger; 15, circulation pump; 16, throttle valve; 17, condensed liquid outlet. DETAILED DESCRIPTION

[0039] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] like Figures 1 to 15 As shown, a surface vacuum evaporation and concentration device for treating oily wastewater includes a vacuum chamber 1 and an evaporator 11. A wastewater inlet 101 is provided on the upper side of the vacuum chamber 1, a steam outlet 102 is provided on one side of the vacuum chamber 1, and a concentrated liquid outlet 103 is provided on the lower side of the vacuum chamber 1. A liquid distribution spray component 6 is provided on the upper side of the vacuum chamber 1, and an evaporation component 3 is provided on the lower side of the vacuum chamber 1. The steam outlet 102 is connected to the shell and tube heat exchanger 7 through a pipeline seal. The shell side inlet of the shell and tube heat exchanger 7 is connected to the cooling water inlet 10, and the tube side outlet and the shell side outlet of the shell and tube heat exchanger 7 are connected to the condensate outlet 17 and the cooling water outlet 9 respectively. The liquid outlet 17 is connected to the vacuum pump 8 through a pipe, the condensate outlet 17 and the cooling water outlet 9 are connected to the water inlet of the plate heat exchanger 14 through a pipe, the water outlet of the plate heat exchanger 14 is connected to one end of the circulating pump 15, and the other end of the circulating pump 15 is connected to the cooling water inlet 10 through a pipe, the evaporator 11 is connected to the heat pump compressor 12, the heat pump compressor 12 is connected to the shell side inlet of the shell and tube condenser 13, the tube side inlet of the shell and tube condenser 13 is connected to one end of the heat transfer oil channel 4, the shell side outlet of the shell and tube condenser 13 is connected to the throttle valve 16, and the throttle valve 16 is connected to the evaporator 11. A conical oil collecting tank 104 for collecting oil is provided at the bottom of the vacuum chamber 1.

[0041] The steam is discharged to the shell and tube heat exchanger 7 through the steam outlet 102, wherein the shell and tube heat exchanger 7 adopts a shell and tube structure, water vapor generated by evaporation is introduced into the shell side, and cooling water (temperature 15°C to 25°C) is introduced into the tube side, and the condensed distilled water is discharged from the collecting pipe. The vacuum pump 8 can extract the steam from the inside of the vacuum chamber 1 and pass it through the shell and tube heat exchanger 7 for condensation. The evaporator 11 is connected to the shell side of the condensing tube in the shell and tube heat exchanger 7 to recover the condensation heat of the water vapor, and cooperates with the plate heat exchanger 14 to cool the cooling water after heat exchange, and uses the circulating pump 15 to circulate the cooled liquid to the cooling water inlet 10 for circulation. The throttle valve 16, the evaporator 11, and the heat pump compressor 12 are connected in sequence through the shell and tube condenser 13 to form a loop to realize the circulation heating of the heat transfer oil inside the heat transfer oil channel 4 to ensure the heating effect.

[0042] It should be noted that the vacuum pump 8 can also make the internal environment of the vacuum cavity 1 in a vacuum state, realize low-temperature and high-efficiency evaporation, and reduce the water boiling point to 33℃ when the vacuum degree is -96kPa. Combined with the corrugated surface to increase the mass transfer area, the evaporation rate is increased by 20%-30% compared with the traditional flat evaporation, and the energy consumption is reduced by more than 40%.

[0043] In the embodiment, the evaporation assembly 3 comprises a rotating column 302, a rotating seat 3022 is fixedly installed at the bottom of the vacuum cavity 1, the rotating column 302 is rotatably installed on the upper end of the rotating seat 3022, a double-end mechanical seal is adopted between the extending pipe 3023 and the rotating column 302, a high-temperature resistant lubricating grease is filled in the sealing cavity, a receiving platform 301 is installed on the upper end of the rotating column 302, a corrugated evaporation plate 3015 is arranged on the upper surface of the receiving platform 301, and a super-hydrophilic coating 306 is arranged on the surface of the corrugated evaporation plate 3015.

[0044] The super-hydrophilic coating 306 is a silicon dioxide-based super-hydrophilic coating 306 coated on the surface of the corrugated plate, wherein the contact angle is less than 10°, the liquid film is uniformly spread, the amount of solid particle adhesion and deposition is reduced by 40%-60%, and it should be noted that the super-hydrophilic coating 306 takes nanometer silicon dioxide (SiO2) as a matrix, is doped with metal oxides (such as TiO2 and Al2O3), is prepared by a sol-gel method, forms a rough surface with a porosity of 30%-50%, has a contact angle of less than 10°, and realizes super-hydrophilicity.

[0045] It should be noted that the receiving platform 301 is internally provided with a circulating channel 304, the circulating channel 304 is internally provided with a partition plate 305 through a connecting seat 3051, the rotating column 302 is internally provided with a first oil inlet channel 3021 and a first oil outlet channel 3026, the first oil inlet channel 3021 is in communication with the center of the partition plate 305, and the first oil outlet channel 3026 is in communication with the outer periphery of the partition plate 305.

[0046] In the specific setting, the lower end of the rotating seat 3022 is provided with the extending pipe 3023, the middle part of the extending pipe 3023 is provided with an oil inlet pipe 3025, the outer side of the extending pipe 3023 is provided with an oil outlet pipe 3024, the oil inlet pipe 3025 is adaptively combined with and communicates with the first oil inlet channel 3021, and the oil outlet pipe 3024 is adaptively combined with and communicates with the first oil outlet channel 3026.

[0047] The heat-conducting oil channel 4 is composed of a second oil inlet channel 402 and a second oil outlet channel 403, the two ends of the second oil inlet channel 402 are respectively connected with the oil inlet pipe 3025 and the oil inlet end of the shell-and-tube condenser 13, the two ends of the second oil outlet channel 403 are respectively connected with the oil outlet pipe 3024 and the oil outlet end of the shell-and-tube condenser 13, and the middle part of the heat-conducting oil channel 4 is provided with a delivery pump 401.

[0048] The two pipeline groups are connected in series to form a closed loop channel by the heat conducting oil passage 4, so that the oil inlet pipeline 3025 and the oil outlet pipeline 3024 are connected in series to the shell and tube condenser 13, so that the delivery pump 401 is started under the action to drive the internal heat conducting oil to realize continuous circulation, and the stable heat conducting oil circulation can be realized during the rotation of the receiving platform 301 by the adapter 3022 and the rotating column 302 and the first oil inlet passage 3021.

[0049] During the circulation, the heat conducting oil enters from the oil inlet pipeline 3025, then passes through the adapter 3022 into the first oil inlet passage 3021, and is delivered to the center of the partition plate 305, so that the heat conducting oil diffuses outward, and the heat of the heat conducting oil during the diffusion process heats the upper corrugated evaporation plate 3015, and the corrugated evaporation plate 3015 can evaporate and treat the wastewater, and after the evaporation and heat exchange, the heat conducting oil falls from the outer periphery of the partition plate 305 and enters the first oil outlet passage 3026, and finally the heat conducting oil after heat exchange is discharged from the extension pipe 3023 and the oil outlet pipeline 3024 to the heat conducting oil passage 4 to realize closed loop circulation operation.

[0050] In the present application, the corrugated evaporation plate 3015 comprises a plurality of wave crests 3011 and wave troughs 3012, and the wave crests 3011 and the wave troughs 3012 are arranged alternately, and an annular protrusion 3013 is arranged at the outer circle of the corrugated evaporation plate 3015.

[0051] Wherein, a plurality of arc-shaped flow channels 3014 are arranged on the outer side of the upper surface of the receiving platform 301, one end of each arc-shaped flow channel 3014 is connected with the annular protrusion 3013, and the other end of each arc-shaped flow channel 3014 penetrates the receiving platform 301.

[0052] The corrugated evaporation plate 3015 is provided with a plurality of wave crests 3011 and wave troughs 3012 on the surface, so that the surface area of the corrugated evaporation plate 3015 can be increased, and the wastewater can be fully contacted with the corrugated evaporation plate 3015 during heat exchange, thereby improving the evaporation efficiency, and a plurality of arc-shaped flow channels 3014 are arranged on the outer side of the receiving platform 301, so that the wastewater thrown out can flow in the arc-shaped flow channels 3014 to reduce the speed of the wastewater thrown out, thereby avoiding the problem of reduced concentration performance caused by incomplete evaporation of the water in the wastewater, and finally the separated oil stains are thrown out along the arc-shaped flow channels 3014 and stored at the bottom of the vacuum cavity 1 to realize oil-water separation of the wastewater.

[0053] In the present application, a sealing mounting cover 5 is fixedly installed on the inside of the vacuum cavity 1, a driving motor 303 is fixedly installed in the sealing mounting cover 5, and the output end of the driving motor 303 is fixedly connected with the center of the lower receiving platform 301.

[0054] By the corrugated evaporation plate 3015 as a concentrated evaporation surface, the oil stains and other impurities remaining in the wastewater can cause the oil stains to accumulate on the surface of the corrugated evaporation plate 3015 during continuous evaporation, and the distance between the subsequent wastewater and the surface of the corrugated evaporation plate 3015 gradually increases, thereby affecting the evaporation efficiency. Therefore, the application starts the driving motor 303, which drives the receiving platform 301 to rotate, so that the oil stains on the surface thereof are thrown outward, thereby avoiding the influence of the evaporation efficiency caused by the accumulation of oil stains.

[0055] In the embodiment, the liquid distribution and spraying assembly 6 comprises a fixed support 601 fixedly installed outside the sealing installation cover 5, and the fixed support 601 is provided with a liquid storage disc 602 at the bottom, and the lower surface of the liquid storage disc 602 is provided with a plurality of spraying heads 604.

[0056] The side of the liquid storage disc 602 is provided with a sealing hose 603, the sealing hose 603 is sealingly connected with the wastewater inlet 101, the liquid level sensor 2 and the temperature sensor are sealingly installed on one side of the vacuum cavity 1, and the concentrated liquid outlet 103 and the wastewater inlet 101 are provided with sealing valves.

[0057] The sealing hose 603 is sealingly connected with the wastewater inlet 101, so that the external wastewater conveying equipment can be connected to realize stable conveying of the wastewater. Under the action of the sealing hose 603, the wastewater fills the liquid storage disc 602 and makes the plurality of spraying heads 604 perform liquid distribution operations respectively, so that the wastewater is uniformly distributed on the surface of the corrugated evaporation plate 3015 and forms a liquid film with a thickness of 0.1-1 mm, realizing rapid evaporation. The temperature sensor can be used to control the speed of the vacuum pump 8 and the conveying pump 401 through the PLC control system, so as to maintain stable vacuum degree (±0.5 kPa) and evaporation temperature (30-50℃). When the oil stains are stored too much, the liquid level sensor 2 can be used to control the external equipment to discharge the oil stains from the concentrated liquid outlet 103 through the PLC control system, so as to avoid the problem that the oil stains are stored too much and affect the subsequent evaporation efficiency.

[0058] In the application, the low temperature specifically refers to the evaporation temperature of the low-temperature surface vacuum evaporation and concentration device, which is 30-50℃. The high temperature of the high-temperature resistant lubricating grease filled in the sealing cavity is the heating temperature of the heat conducting oil, which is 55℃.

[0059] The working principle of the surface vacuum evaporation and concentration device for treating oily wastewater is as follows:

[0060] In use, the oily wastewater is first removed of floating oil and large particle suspended solids (particle size > 50 um) through an oil separation tank, and then further purified through a bag filter (precision 10 um) to reduce the solid content in the wastewater to less than 50 mg / L, thereby reducing the risk of subsequent scaling.

[0061] Subsequently, the vacuum pump 8 is started, the pressure in the vacuum cavity 1 is reduced to -96 kPa, and the heat conducting oil is heated to 55 DEG C by the shell and tube condenser 13 and circulated into the heat conducting oil channel 4 of the evaporation assembly 3;

[0062] After the pretreatment, the wastewater is uniformly sprayed to the surface of the corrugated evaporation plate 3015 by the liquid spraying assembly 6, a 0.5mm liquid film is formed, and the water is rapidly evaporated under the conditions of vacuum and low temperature (30 DEG C-50 DEG C), the water vapor enters the shell and tube heat exchanger 7 through the top outlet;

[0063] The water vapor is reversely contacted with 20 DEG C cooling water in the shell and tube heat exchanger 7, is condensed into distilled water, is delivered to the condensate outlet 17 through a pipeline and is collected for reuse;

[0064] The fluid after heat exchange of the heat conducting oil is delivered from the shell and tube condenser 13 to the heat pump evaporator 11 under the action of the throttle valve 16, is heated by the heat pump compressor 12 and is then delivered to the shell and tube condenser 13 to heat the heat conducting oil for circulation;

[0065] After the liquid level of the separated oil and dirt is detected by the liquid level sensor 2 to reach a predetermined threshold, the valve is opened to discharge the concentrated liquid (the oil content is increased to 3%-5%) and the concentrated liquid enters a subsequent air floatation or centrifugal unit to recover the oil product, and the remaining residue is solidified;

[0066] The super-hydrophilic coating 306 is adopted, the surface deposition amount of the device after 48 hours of continuous operation is only 1 / 3 of that of the traditional flat evaporation, and the corrugated evaporation plate 3015 is rotated by starting the driving motor 303 in the evaporation process, so that the material oil and dirt is thrown out, and the surface residual oil and dirt can be further reduced.

[0067] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application, and for those skilled in the art, other different forms of changes or variations can be made on the basis of the above description, and it is impossible to enumerate all the implementation modes here, and any obvious changes or variations derived from the technical solutions of the present application still fall within the protection scope of the present application.

Claims

1. A surface vacuum evaporation and concentration device for treating oily wastewater, comprising a vacuum chamber (1) and an evaporator (11), characterized in that: The upper side of the vacuum chamber (1) is provided with a wastewater inlet (101), the side of the vacuum chamber (1) is provided with a steam outlet (102), the lower side of the vacuum chamber (1) is provided with a concentrated liquid outlet (103), the upper side of the interior of the vacuum chamber (1) is provided with a liquid distribution spray assembly (6), the lower side of the interior of the vacuum chamber (1) is provided with an evaporation assembly (3), the steam outlet (102) is connected to the shell and tube heat exchanger (7) through a pipeline seal, the shell-side inlet of the shell and tube heat exchanger (7) is connected to the cooling water inlet (10), the tube-side outlet and the shell-side outlet of the shell and tube heat exchanger (7) are connected to the condensate outlet (17) and the cooling water outlet (9) respectively, the condensate outlet (17) is connected to the vacuum pump (8) through a pipeline, The condensate outlet (17) and the cooling water outlet (9) are connected to the water inlet of the plate heat exchanger (14) via a pipeline, the water outlet of the plate heat exchanger (14) is connected to one end of the circulation pump (15), the other end of the circulation pump (15) is connected to the cooling water inlet (10) via a pipeline, the evaporator (11) is connected to the heat pump compressor (12), the heat pump compressor (12) is connected to the shell-side inlet of the shell-and-tube condenser (13), the tube-side inlet of the shell-and-tube condenser (13) is connected to one end of the heat transfer oil channel (4), the shell-side outlet of the shell-and-tube condenser (13) is connected to the throttle valve (16), the throttle valve (16) is connected to the evaporator (11), and a conical oil collecting tank (104) for collecting oil is provided at the bottom of the vacuum chamber (1); The evaporation component (3) includes a rotating column (302), a transfer seat (3022) is fixedly installed at the bottom of the vacuum chamber (1), the rotating column (302) is rotatably installed on the upper end of the transfer seat (3022), a receiving platform (301) is installed on the upper end of the rotating column (302), a corrugated evaporation plate (3015) is provided on the upper surface of the receiving platform (301), and a super-hydrophilic coating (306) is provided on the surface of the corrugated evaporation plate (3015); The corrugated evaporation plate (3015) comprises a plurality of crests (3011) and troughs (3012), wherein the crests (3011) and troughs (3012) are arranged alternately, and the outer ring of the corrugated evaporation plate (3015) is provided with a circular protrusion (3013); A plurality of arc-shaped flow channels (3014) are provided on the outer side of the upper surface of the receiving platform (301), one end of each arc-shaped flow channel (3014) is connected to the annular protrusion (3013), and the other end of each arc-shaped flow channel (3014) passes through the receiving platform (301).

2. A surface vacuum evaporation concentration device for treating oily wastewater according to claim 1, characterized in that: A circulation channel (304) is provided inside the receiving platform (301), a partition plate (305) is installed inside the circulation channel (304) via a connecting seat (3051), and a first oil inlet channel (3021) and a first oil outlet channel (3026) are provided inside the rotating column (302), the first oil inlet channel (3021) is communicated with the center of the partition plate (305), and the first oil outlet channel (3026) is communicated with the periphery of the partition plate (305).

3. The surface vacuum evaporation concentration device for treating oily wastewater according to claim 2, characterized in that: An extension tube (3023) is provided at the lower end of the adapter seat (3022), and a double-end mechanical seal is adopted between the extension tube (3023) and the rotating column (302). An oil inlet pipe (3025) is provided in the middle of the extension tube (3023), and an oil outlet pipe (3024) is provided on the outside of the extension tube (3023). The oil inlet pipe (3025) and the first oil inlet channel (3021) are combined and interconnected, and the oil outlet pipe (3024) and the first oil outlet channel (3026) are combined and interconnected.

4. The surface vacuum evaporation concentration device for treating oily wastewater according to claim 3, characterized in that: The heat transfer oil channel (4) is composed of a second oil inlet channel (402) and a second oil outlet channel (403). The two ends of the second oil inlet channel (402) are respectively connected to the oil inlet pipeline (3025) and the oil inlet end of the shell and tube condenser (13). The two ends of the second oil outlet channel (403) are respectively connected to the oil outlet pipeline (3024) and the oil outlet end of the shell and tube condenser (13). A delivery pump (401) is provided in the middle of the heat transfer oil channel (4).

5. The surface vacuum evaporation concentration device for treating oily wastewater according to claim 1, characterized in that: A sealing mounting cover (5) is fixedly mounted on the upper side of the interior of the vacuum chamber (1), a driving motor (303) is fixedly mounted inside the sealing mounting cover (5), and an output end of the driving motor (303) is fixedly connected to the center of the receiving platform (301) below.

6. The surface vacuum evaporation concentration device for treating oily wastewater according to claim 5, characterized in that: The liquid distribution spray assembly (6) comprises a fixed bracket (601), the fixed bracket (601) is fixedly mounted on the outside of the sealing mounting cover (5), a liquid storage tray (602) is provided at the bottom of the fixed bracket (601), and a plurality of spray heads (604) are provided on the lower surface of the liquid storage tray (602).

7. The surface vacuum evaporation concentration device for treating oily wastewater according to claim 6, characterized in that: A sealing hose (603) is provided on one side of the liquid storage tray (602), and the sealing hose (603) is sealed and connected to the wastewater inlet (101). A liquid level sensor (2) and a temperature sensor are sealed and installed on one side of the vacuum chamber (1). Sealing valves are provided inside the concentrated liquid outlet (103) and the wastewater inlet (101).

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