CN216890492U - Device for treating high-salinity wastewater through CPC coupling multiple-effect evaporation-electrodialysis - Google Patents

Abstract

The utility model discloses a device for treating high-salinity wastewater by CPC coupling multiple-effect evaporation-electrodialysis, belonging to the technical field of high-salinity wastewater treatment; a CPC solar heat collector device is introduced into the existing system, and a plate heat exchanger is taken as a core to form two major parts of solar heat fluid circulation and solar cold fluid circulation; the solar thermal fluid circulation structure includes: the device comprises a plate heat exchanger heat flow outlet, a variable frequency circulating pump, a narrow groove type paraboloid heat collector and a plate heat exchanger heat flow inlet which are connected in sequence; the solar cold fluid circulating structure includes: the cold flow outlet of the plate heat exchanger, the multi-effect evaporation device, the separator, the condensing tower and the cold flow inlet of the plate heat exchanger are connected in sequence; hot fluid in the solar hot fluid circulation is heated by a narrow-groove parabolic heat collector and then circulates in a plate heat exchanger; the steam flowing through the multi-effect evaporation device is sent into the plate heat exchanger through solar cold fluid circulation to exchange heat with the circulating hot fluid; partial energy is provided by solar energy to relieve energy consumption.

Description

Device for treating high-salinity wastewater through CPC coupling multiple-effect evaporation-electrodialysis

Technical Field

The utility model belongs to the technical field of high-salinity wastewater treatment, and particularly relates to a device for treating high-salinity wastewater by using CPC (compound parabolic concentrator) coupled multiple-effect evaporation-electrodialysis.

Background

A large amount of high-salinity wastewater which cannot be directly utilized exists in oceans, salt lakes and the like, and the industrial and agricultural production consumes fresh water which is in short supply and even generates a large amount of high-salinity wastewater. The direct discharge of high-salinity wastewater not only damages the ecological environment, but also causes great harm to human bodies. Under the current situation of shortage of fresh water resources and increased environmental protection, various countries in the world are all engaged in water recycling in a sustainable manner, for example, desalting high-concentration salt-containing wastewater to achieve zero emission; in addition, after a large amount of seawater, salt lake salt water and the like are properly treated, the effective supplement of fresh water resources can be realized, and the double benefits of environment and economy can be brought. Therefore, the method is particularly necessary for research and development of high-salinity wastewater treatment processes and equipment with high efficiency, energy conservation and low operation cost.

As shown in fig. 4, the structure of the existing device for treating high-salinity wastewater by multiple-effect evaporation-electrodialysis is schematically shown, the device mainly comprises a degassing preheating device, a multiple-effect evaporation device, a separator and an electrodialysis desalination device, and most of the existing devices adopt electricity or coal combustion to provide steam for the multiple-effect evaporation device, so that the energy consumption is high and the pollution is serious; in order to realize energy conservation and emission reduction, the utility model discloses introduce CPC solar collector device in current system.

SUMMERY OF THE UTILITY MODEL

The existing multi-effect evaporation-electrodialysis high-salinity wastewater treatment device only adopts electricity or coal combustion to provide steam for the multi-effect evaporation device, so that the energy consumption is large; the utility model aims to provide a device for treating high-salinity wastewater by using CPC (compound parabolic concentrator) coupled multi-effect evaporation-electrodialysis, which realizes energy conservation and emission reduction by introducing a CPC solar heat collector device.

The technical scheme adopted by the utility model is as follows: a device for treating high-salinity wastewater by CPC coupling multiple-effect evaporation-electrodialysis comprises a degassing preheating device, a multiple-effect evaporation device, a separator and an electrodialysis desalting device, wherein a CPC solar heat collector device is introduced into the device and comprises a plate heat exchanger, and a solar heat fluid circulation part and a solar cold fluid circulation part are formed by taking the plate heat exchanger as a core; the solar thermal fluid circulation structure includes: the device comprises a plate heat exchanger heat flow outlet, a variable frequency circulating pump, a narrow groove type paraboloid heat collector and a plate heat exchanger heat flow inlet which are connected in sequence; the solar cooling fluid circulation structure includes: the cold flow outlet of the plate heat exchanger, the multi-effect evaporation device, the separator, the condensing tower and the cold flow inlet of the plate heat exchanger are connected in sequence; hot fluid in the solar hot fluid circulation is heated by a narrow-groove parabolic heat collector and then circulates in a plate heat exchanger; the steam flowing through the multi-effect evaporation device is sent into the plate heat exchanger through solar cold fluid circulation to exchange heat with the circulating hot fluid.

Further, a fan cooling heat exchanger is further arranged in the solar heat fluid circulating structure, when the heat is surplus, the surplus heat collected by the narrow-groove type parabolic heat collector is dissipated by the fan cooling heat exchanger, and the stable operation of the device is kept.

Further, an expansion tank is further arranged in the solar heat fluid circulation structure and connected to the solar heat fluid circulation pipeline through a first spherical valve; and releasing the pressure when the pressure in the solar heat fluid circulating pipeline is excessive.

Further, an ethylene glycol aqueous solution barrel is further arranged in the solar heat fluid circulation structure and connected to the solar heat fluid circulation pipeline through a second spherical valve; and when the heat exchange medium is absent, liquid supplementing is carried out.

Preferably, the multi-effect evaporation device comprises a zero-effect evaporator, a first-effect evaporator, a second-effect evaporator and a third-effect evaporator which are sequentially connected; and a cold flow outlet of the plate heat exchanger is connected with a steam inlet of the zero-effect evaporator, then high-temperature steam sequentially passes through the zero-effect evaporator, the first-effect evaporator, the second-effect evaporator and the third-effect evaporator, and finally flows out of a steam outlet of the third-effect evaporator to enter the separator.

The utility model has the beneficial effects that: the existing multi-effect evaporation-electrodialysis high-salinity wastewater treatment device only adopts electricity or coal combustion to provide steam for the multi-effect evaporation device, so that the energy consumption is large; the utility model provides a device for treating high-salinity wastewater by CPC coupling multi-effect evaporation-electrodialysis, which realizes energy conservation and emission reduction by introducing a CPC solar heat collector device.

Drawings

Fig. 1 is a schematic structural diagram of a device for treating high-salinity wastewater by coupling CPC with multiple-effect evaporation-electrodialysis, which is provided by the utility model.

Fig. 2 is a detail illustration of the degassing preheating device, the multi-effect evaporation device, the separator, the CPC solar collector device in the present invention.

Fig. 3 is a detail display view of an electrodialysis desalination apparatus.

FIG. 4 is a schematic structural diagram of a conventional device for treating high-salinity wastewater by multiple-effect evaporation-electrodialysis.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

As shown in fig. 1, a device for treating high-salinity wastewater by CPC coupling multiple-effect evaporation-electrodialysis mainly comprises a degassing preheating device, a multiple-effect evaporation device, a separator, a condensing tower, an electrodialysis desalination device and a CPC solar collector device.

As shown in fig. 2, the degassing preheating device comprises the following main equipment:

a high-salinity wastewater tank 10; a first horizontal circulation pump 11; the first shell-and-tube heat exchanger 12, the first shell-and-tube heat exchanger 12 is provided with a first shell-and-tube heat exchanger cold flow inlet 121, a first shell-and-tube heat exchanger cold flow outlet 122, a first shell-and-tube heat exchanger hot flow inlet 123, and a first shell-and-tube heat exchanger hot flow outlet 124; a degassing tower 13, wherein the degassing tower 13 is provided with a degassing tower fluid inlet 131, a degassing tower exhaust port 132 and a degassing tower lower port 133; a vertical circulation pump 14; the second shell-and-tube heat exchanger 15 is provided with a second shell-and-tube heat exchanger cold flow inlet 151, a second shell-and-tube heat exchanger cold flow outlet 152, a second shell-and-tube heat exchanger hot flow inlet 153 and a second shell-and-tube heat exchanger hot flow outlet 154; a second horizontal circulation pump 16; also involved are a separator 42 and a condensate tank 43.

The connection relationship among the devices of the degassing preheating device is as follows:

the high-salinity wastewater tank 10, the first horizontal circulating pump 11, the first shell-and-tube heat exchanger 12, the degassing tower 13, the vertical circulating pump 14, the second shell-and-tube heat exchanger 15 and the second horizontal circulating pump 16 are sequentially connected; wherein the cold flow inlet 121 of the first shell-and-tube heat exchanger 12 is connected with the first horizontal circulating pump 11, and the cold flow outlet 122 of the first shell-and-tube heat exchanger is connected with the fluid inlet 131 of the degassing tower 13; the first shell-and-tube heat exchanger heat flow inlet 123 is connected with the multi-effect evaporation device through the separator 42; the first shell-and-tube heat exchanger hot fluid outlet 124 is connected to the condensate tank 43. A cold flow inlet 151 of the second shell-and-tube heat exchanger 15 is connected with the vertical circulating pump 14; the cold flow outlet 152 of the second shell-and-tube heat exchanger is connected with a second horizontal circulating pump 16; the heat flow inlet 153 of the second shell-and-tube heat exchanger is connected with the multi-effect evaporation device through the separator 42; the second shell-and-tube heat exchanger hot effluent outlet 154 is connected to the condensate tank 43.

The technological process of the degassing preheating device is as follows:

the high-salinity wastewater stored in the high-salinity wastewater tank 10 is conveyed to the first shell-and-tube heat exchanger 12 through the first horizontal circulating pump 11, flows in from the cold flow inlet 121 of the first shell-and-tube heat exchanger, and the hot fluid of the first shell-and-tube heat exchanger 12 is part of residual steam generated by the multi-effect evaporation device, flows in from the hot flow inlet 123 of the first shell-and-tube heat exchanger, and flows out from the hot flow outlet 124 of the first shell-and-tube heat exchanger to enter the condensate water tank 43; the high-salinity wastewater is subjected to heat exchange with steam provided by the multi-effect evaporation device in the first shell-and-tube heat exchanger 12, and then flows out of a cold flow outlet 122 of the first shell-and-tube heat exchanger to enter the degassing tower 13.

The high-salinity wastewater flows into the degassing tower 13 from a fluid inlet 131 of the degassing tower, and impurity gas in the high-salinity wastewater subjected to degassing treatment in the degassing tower 13 is discharged through a degassing tower exhaust port 132 at the upper part; the remaining fluid is discharged through the degassing column lower port 133 and is sent to the second shell-and-tube heat exchanger 15 by the vertical circulation pump 14.

The high-salinity wastewater flows in from the cold flow inlet 151 of the second shell-and-tube heat exchanger, the hot fluid of the second shell-and-tube heat exchanger 15 is part of residual steam generated by the multi-effect evaporation device, flows in from the hot flow inlet 153 of the second shell-and-tube heat exchanger, and flows out from the hot flow outlet 154 of the second shell-and-tube heat exchanger to enter the condensate water tank 43; after heat exchange is carried out between the high-salinity wastewater and steam provided by the multi-effect evaporation device in the second shell-and-tube heat exchanger 15, the high-salinity wastewater flows out from the cold flow outlet 152 of the second shell-and-tube heat exchanger and is conveyed to the multi-effect evaporation device through the second horizontal circulating pump 16.

As shown in fig. 2, the multi-effect evaporation apparatus includes the following main devices:

the zero-effect evaporator 17 is provided with a zero-effect evaporator upper port 171, a zero-effect evaporator lower port 172, a zero-effect evaporator steam inlet 173 and a zero-effect evaporator steam outlet 174; a third horizontal circulation pump 18; the first-effect evaporator 19, the first-effect evaporator 19 is provided with a first-effect evaporator upper port 191, a first-effect evaporator lower port 192, a first-effect evaporator steam inlet 193 and a first-effect evaporator steam outlet 194; a fourth horizontal circulation pump 20; the double-effect evaporator 21, the double-effect evaporator 21 is provided with a double-effect evaporator upper port 211, a double-effect evaporator lower port 212, a double-effect evaporator steam inlet 213 and a double-effect evaporator steam outlet 214; a fifth horizontal circulation pump 22; the triple-effect evaporator 23, the triple-effect evaporator 23 is provided with a triple-effect evaporator upper port 231, a triple-effect evaporator lower port 232, a triple-effect evaporator steam inlet 233 and a triple-effect evaporator steam outlet 234; and a sixth horizontal circulation pump 24.

The connection relationship among the devices of the multi-effect evaporation device is as follows:

the upper port 171 of the zero-effect evaporator 17 is connected with the second horizontal circulating pump 16; the lower port 172 of the zero-effect evaporator is connected with the upper port 191 of the first-effect evaporator through a third horizontal circulating pump 18; the zero-effect evaporator steam inlet 173 is connected to the CPC solar collector device; the zero effect evaporator vapor outlet 174 is connected to a one effect evaporator vapor inlet 193. The lower port 192 of the first-effect evaporator is connected with the upper port 211 of the second-effect evaporator through a fourth horizontal circulating pump 20; the first effect evaporator steam outlet 194 is connected to the second effect evaporator steam inlet 213. The lower port 212 of the second-effect evaporator 21 is connected with the upper port 231 of the third-effect evaporator through a fifth horizontal circulating pump 22; the second effect evaporator steam outlet 214 is connected to the third effect evaporator steam inlet 233. The lower port 232 of the triple-effect evaporator is connected with the electrodialysis desalination device through a sixth horizontal circulating pump 24; the triple effect evaporator vapor outlet 234 is connected to the separator 42.

The technological process of the multi-effect evaporation device is as follows:

(1) the high-salinity wastewater is fed in from the upper port 171 of the zero-effect evaporator by the second horizontal circulating pump 16; the high temperature steam generated by the CPC solar collector device is sent into the zero effect evaporator 17 through the steam inlet 173 of the zero effect evaporator; the high-salt wastewater and the high-temperature steam exchange heat in the zero-effect evaporator 17 and carry out gas-liquid separation, and the separated gas flows out through a steam outlet 174 of the zero-effect evaporator and then enters the first-effect evaporator 19 through a steam inlet 193 of the first-effect evaporator; the separated liquid flows out through the lower port 172 of the zero-effect evaporator, and is conveyed to the first-effect evaporator 19 through the third horizontal circulation pump 18, and flows in through the upper port 191 of the first-effect evaporator.

(2) The high-salinity wastewater separated by the zero-effect evaporator 17 and the steam are subjected to heat exchange and gas-liquid separation in the one-effect evaporator 19; the separated gas flows out through the steam outlet 194 of the first-effect evaporator and then flows into the second-effect evaporator 21 through the steam inlet 213 of the second-effect evaporator; the separated liquid flows out through the first-effect evaporator lower port 192, is sent to the second-effect evaporator 21 by the fourth horizontal circulation pump 20, and flows in through the second-effect evaporator upper port 211.

(3) The high-salinity wastewater separated by the first-effect evaporator 19 and the steam are subjected to heat exchange and gas-liquid separation in the second-effect evaporator 21; the separated gas flows out through the steam outlet 214 of the double-effect evaporator and then flows into the triple-effect evaporator 23 through the steam inlet 233 of the triple-effect evaporator; the separated liquid flows out through the second-effect evaporator lower port 212, is sent to the third-effect evaporator 23 by the fifth horizontal circulation pump 22, and flows in through the third-effect evaporator upper port 231.

(4) The high-salinity wastewater and the steam separated by the second-effect evaporator 21 exchange heat and are subjected to gas-liquid separation in the third-effect evaporator 23, the separated gas flows out through a vapor outlet 234 of the third-effect evaporator and then flows into the separator 42, and the separated liquid flows out through a lower port 232 of the third-effect evaporator and then is respectively conveyed to the first fresh water tank 25 and the first concentrated water tank 26 in the electrodialysis desalination device through the sixth horizontal circulating pump 24.

After the steam separated by the triple-effect evaporator 23 flows into the separator 42, a part of the steam flows into the first shell-and-tube heat exchanger 12 to act as heat flow, a part of the steam flows into the second shell-and-tube heat exchanger 15 to act as heat flow, and the rest of the steam flows into the condensing tower 44 to condense the steam into water.

As shown in fig. 3, the electrodialysis desalination apparatus comprises the following main devices:

a first fresh water tank 25; a first concentrate tank 26; a seventh horizontal circulation pump 27; an eighth horizontal circulation pump 28; a concentrate filter 29; a fresh water filter 30; a concentrate flow meter 31; a fresh water flow meter 32; a second rich water tank 33; a second fresh water tank 34; an extreme water tank 35; a ninth horizontal circulation pump 36; an polar water filter 37; the polar water heat exchanger 38 is characterized in that the polar water heat exchanger 38 is provided with a polar water heat exchanger heat flow inlet 381, a polar water heat exchanger heat flow outlet 382, a polar water heat exchanger cold flow inlet 383 and a polar water heat exchanger cold flow outlet 384; a polar water flow meter 39; the electrodialysis device 40 is provided with an electrodialysis concentrated water inlet 401, an electrodialysis fresh water inlet 402, a first electrodialysis power supply interface 403, an electrodialysis polar water inlet 404, an electrodialysis concentrated water outlet 405, an electrodialysis fresh water outlet 406, a second electrodialysis power supply interface 407 and an electrodialysis polar water outlet 408.

The connection relationship among the devices of the electrodialysis desalination device is as follows:

the high-salinity wastewater is respectively conveyed to a first fresh water tank 25 and a first concentrated water tank 26 in the electrodialysis desalination device through a sixth horizontal circulating pump 24; the first fresh water tank 25, the eighth horizontal circulating pump 28, the fresh water filter 30 and the fresh water flow meter 32 are connected in sequence and are finally connected to the electrodialysis fresh water inlet 402; the first concentrated water tank 26, the seventh horizontal circulating pump 27, the concentrated water filter 29 and the concentrated water flowmeter 31 are sequentially connected, and are finally connected to the electrodialysis concentrated water inlet 401; the first electrodialysis power interface 403 and the second electrodialysis power interface 407 on the electrodialysis device 40 are connected with a power supply to provide energy for the electrodialysis device 40; an electrodialysis concentrated water outlet 405 of the electrodialysis device 40 is connected with the second concentrated water tank 33; the electrodialysis fresh water outlet 406 of the electrodialysis device 40 is connected with the second fresh water tank 34; an electrodialysis electrode water outlet 408 on the electrodialysis device 40 is sequentially connected with the electrode water tank 35, the ninth horizontal circulating pump 36, the electrode water filter 37 and the electrode water heat exchanger 38; the polar water heat exchanger 38 is provided with a polar water heat exchanger heat flow inlet 381, a polar water heat exchanger heat flow outlet 382, a polar water heat exchanger cold flow inlet 383 and a polar water heat exchanger cold flow outlet 384; wherein the polar water heat exchanger heat flow inlet 381 is connected with the polar water filter 37; the heat flow outlet 382 of the polar water heat exchanger is connected with a polar water flow meter 39, and the polar water flow meter 39 is connected with the electrodialysis polar water inlet 404; and a cold flow inlet 383 of the polar water heat exchanger and a cold flow outlet 384 of the polar water heat exchanger are connected with a tap water supply end for circulation.

The process principle of the electrodialysis desalination device is as follows:

(1) the high-salinity wastewater in the first concentrate tank 26 is conveyed to an electrodialysis concentrate inlet 401 through a seventh horizontal circulating pump 27, impurities are filtered through a concentrate filter 29 during the conveying process, and the flow rate of the fluid is measured through a concentrate flow meter 31. The high salinity wastewater in the first fresh water tank 25 is transported to the electrodialysis fresh water inlet 402 by the eighth horizontal circulation pump 28, during which impurities are filtered by the fresh water filter 30 and the flow of the fluid is measured by the fresh water flow meter 32.

(2) After the high-salt wastewater flowing into the electrodialysis device 40 is subjected to ion exchange, the liquid in the concentrate compartment of the electrodialysis device 40 flows into the second concentrate tank 33, and the liquid in the dilute compartment flows into the second dilute tank 34. The polar water in the electrodialysis device 40 is discharged through an electrodialysis polar water outlet 408, and is sequentially conveyed through the polar water tank 35, the ninth horizontal circulating pump 36, the polar water filter 37, and finally enters the polar water heat exchanger 38; the polar water acts as the heat flow of the polar water heat exchanger 38, flows in from the polar water heat exchanger heat flow inlet 381, flows out from the polar water heat exchanger heat flow outlet 382, and flows back to the electrodialysis device 40 through the polar water flow meter 39; tap water serves as cold flow of the polar water heat exchanger 38, flows in from a cold flow inlet 383 of the polar water heat exchanger, and flows out from a cold flow outlet 384 of the polar water heat exchanger; the tap water and the polar water exchange heat in the polar water heat exchanger 38. After heat exchange, the water flows in from the electrodialysis polar water inlet 404, and the electrodialysis polar water flows out from the electrodialysis polar water outlet 408 and returns to the polar water tank 35. The fluid flow is measured during delivery via a polar water flow meter 39.

In the prior art, electricity or coal combustion is mostly adopted to provide steam for a multi-effect evaporation device (as shown in figure 4), so that the energy consumption is high and the pollution is serious; in order to alleviate this technical problem, the present invention introduces a CPC solar collector device in the existing system, which relates to the following main equipments:

the plate heat exchanger 41 is provided with a plate heat exchanger cold flow inlet 411, a plate heat exchanger cold flow outlet 412, a plate heat exchanger heat flow inlet 413 and a plate heat exchanger heat flow outlet 414; a separator 42; a condensing tower 44; a variable frequency circulation pump 45; an expansion tank 46; a first ball valve 47; a second ball valve 48; a glycol aqueous solution tank 49; a fan cooling heat exchanger 50; a narrow trough parabolic heat collector 51; the central control unit CCU 52.

In the CPC solar heat collector device, a plate heat exchanger 41 is taken as a core, and two parts of solar heat fluid circulation and solar cold fluid circulation are formed; the following is a detailed description of the connection relationship between the devices:

the plate heat exchanger heat flow outlet 414 is sequentially connected with the variable frequency circulating pump 45, the fan cooling heat exchanger 50, the narrow groove type parabolic heat collector 51 and the plate heat exchanger heat flow inlet 413 to form solar heat fluid circulation; in addition, an expansion tank 46 and a glycol water solution barrel 49 can be further added between the variable-frequency circulating pump 45 and the fan cooling heat exchanger 50; the expansion tank 46 is connected to a pipeline between the variable-frequency circulating pump 45 and the fan cooling heat exchanger 50 through a first spherical valve 47; the glycol aqueous solution barrel 49 is connected to a pipeline between the variable frequency circulating pump 45 and the fan cooling heat exchanger 50 through a second ball valve 48.

Solar energy cold fluid circulates as follows: the cold flow outlet 412 of the plate heat exchanger is connected with a multi-effect evaporation device, particularly a steam inlet 173 of a zero-effect evaporator, and then high-temperature steam sequentially passes through the zero-effect evaporator 17, the first-effect evaporator 19, the second-effect evaporator 21 and the third-effect evaporator 23; the vapor outlet 234 of the triple-effect evaporator 23 is connected with the separator 42, a part of vapor in the separator 42 flows into the first shell-and-tube heat exchanger 12 to act as heat flow, a part of vapor flows into the second shell-and-tube heat exchanger 15 to act as heat flow, the rest of vapor flows into the condensing tower 44 to condense the vapor into water, and the condensing tower 44 is connected with the cold flow inlet 411 of the plate heat exchanger.

The technological process of the CPC solar heat collector device is as follows:

the hot fluid in the CPC solar collector device is heated by the narrow-trough parabolic collector 51 and then circulates in the plate heat exchanger 41; the high temperature steam flows through the multi-effect evaporator, the separator 42, is finally condensed in the condensing tower 44, and then is sent to the plate heat exchanger 41 to exchange heat with the circulating hot fluid.

When the heat is surplus, the CCU52 adjusts the heat, and the surplus heat collected by the narrow-groove parabolic heat collector 51 is dissipated by the fan cooling heat exchanger 50; when the pressure is too high, the expansion tank 46 and the first ball valve 47 are used for releasing; when the heat exchange medium is absent, the solution is replenished by using the glycol aqueous solution barrel 49 and the second ball valve 48 to keep the normal operation of the CPC solar collector device.

A concrete application example of the device

High-salinity wastewater with the mole fraction of 3.78 percent is conveyed to a first shell-and-tube heat exchanger 12 by a first horizontal circulating pump 11 for primary preheating, and O is removed from the preheated high-salinity wastewater by a degassing tower 13₂、N₂、CO、CO₂And the like. And then the heat exchange is carried out between the low-temperature steam generated by the multi-effect evaporation device and the second shell-and-tube heat exchanger 15.

The high-salinity wastewater is treated by the degassing and preheating device and then is conveyed to the multi-effect evaporation device by the second horizontal circulating pump 16. The multi-effect evaporation device comprises a zero-effect evaporator (pressure: 0.06 MPa), a first-effect evaporator (pressure: 0.052 MPa), a second-effect evaporator (pressure: 0.049 MPa) and a third-effect evaporator (pressure: 0.03 MPa). The low-temperature gas that multi-effect evaporation plant produced separates through the separator, and partly low-temperature gas is carried to degasification preheating device and is preheated high salt waste water, and another part low-temperature gas is carried to the condensing tower and is condensed into water, then carries out heat exchange through plate heat exchanger 41 and the heat transfer medium among the CPC solar collector device, finally provides high-temperature steam for multi-effect evaporation plant again.

The heat exchange medium (20% glycol aqueous solution) in the CPC solar collector device is conveyed to the narrow-trough parabolic collector 51 by the variable frequency circulating pump 45 and is heated by solar energy.

After being processed by a degassing preheating device, the NaCl is conveyed to a zero-effect evaporator 17 by a second horizontal circulating pump 16, and the mass fraction of the NaCl is increased to 4.70%; the NaCl mass fraction is improved to 5.99 percent after the treatment of the single-effect evaporator 19; the mass fraction of NaCl is improved to 8.22 percent after being treated by a double-effect evaporator 21; the NaCl mass fraction is improved to 13 percent after the treatment of the triple effect evaporator 23.

And (3) carrying out ion exchange on the high-salinity wastewater treated by the multi-effect evaporation device by using the electrodialysis desalination device, wherein the mass fraction of the NaCl solution in the concentrated water chamber after the treatment by the electrodialysis desalination device reaches 21%.

In the process route of coupling the CPC with the multi-effect evaporation-electrodialysis, the traditional steam supply mode is adopted when the CPC can not meet the steam temperature requirement of the multi-effect evaporation device.

It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the utility model. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the utility model without departing from the essential scope thereof. Therefore, it is intended that the utility model not be limited to the particular embodiment disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.

Claims (5)

1. A device for treating high-salinity wastewater by CPC coupling multiple-effect evaporation-electrodialysis comprises a degassing preheating device, a multiple-effect evaporation device, a separator and an electrodialysis desalination device, and is characterized in that a CPC solar heat collector device is introduced into the device and comprises a plate heat exchanger (41), and a solar heat fluid circulation part and a solar heat cold fluid circulation part are formed by taking the plate heat exchanger (41) as a core; the solar thermal fluid circulation structure includes: the device comprises a plate heat exchanger heat flow outlet (414), a variable frequency circulating pump (45), a narrow groove type parabolic heat collector (51) and a plate heat exchanger heat flow inlet (413) which are connected in sequence; the solar cooling fluid circulation structure includes: the device comprises a cold flow outlet (412) of the plate heat exchanger, a multi-effect evaporation device, a separator (42), a condensing tower (44) and a cold flow inlet (411) of the plate heat exchanger which are connected in sequence.

2. The device for the treatment of high salinity wastewater by CPC-coupled multi-effect evaporation-electrodialysis according to claim 1, characterized in that a fan-cooled heat exchanger (50) is further provided in the solar thermal fluid circulation structure.

3. The device for the treatment of high salinity wastewater by CPC coupled multiple-effect evaporation-electrodialysis according to claim 1, characterized in that an expansion tank (46) is further provided in the solar thermal fluid circulation structure, and the expansion tank (46) is connected to the solar thermal fluid circulation pipeline through a first ball valve (47).

4. The device for treating high-salinity wastewater through CPC-coupled multiple-effect evaporation-electrodialysis according to claim 1, wherein a glycol water solution barrel (49) is further arranged in the solar heat fluid circulation structure, and the glycol water solution barrel (49) is connected to the solar heat fluid circulation pipeline through a second ball valve (48).

5. A device for CPC coupling multiple-effect evaporation-electrodialysis treatment of high salinity wastewater according to any one of claims 1-4, characterized in that the multiple-effect evaporation device comprises a zero-effect evaporator (17), a first-effect evaporator (19), a second-effect evaporator (21), and a third-effect evaporator (23) which are connected in sequence.

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