CN112678903B - Salt-containing wastewater treatment equipment and method - Google Patents

Abstract

The invention relates to the technical field of wastewater treatment, in particular to salt-containing wastewater treatment equipment and a salt-containing wastewater treatment method. The continuous and stable operation of the salt-containing wastewater treatment process is realized, and the recovery rate of heat energy is improved.

Description

Salt-containing wastewater treatment equipment and method

Technical Field

The invention relates to the technical field of wastewater treatment, in particular to a device and a method for treating salt-containing wastewater.

Background

A large amount of salt-containing wastewater can be generated in various industrial fields, such as chemical industry, papermaking, printing and dyeing, medicine, garbage treatment and the like, and the salt-containing wastewater generally, particularly the high-concentration salt-containing wastewater contains higher inorganic ions, such as Cl-, SO42-, na +, ca2+ and the like, and also contains organic matters which are difficult to biodegrade, such as humic acid, halogenated organic matters, aromatic organic matters and the like. Because the salinity is high, the microorganism growth inhibition effect is stronger, so the saline wastewater treatment technology difficulty is far more than that of the common sewage treatment.

The treatment of domestic and foreign salt-containing wastewater is carried out by a plurality of process flows, which mainly comprise the steps of pretreatment, advanced oxidation, reduction, biomembrane treatment, concentration and evaporation and the like, wherein the concentration and evaporation method is one of the main methods for achieving zero emission at present. Evaporative concentration processes that are currently more common and have engineering applications in the industry include mechanical compression re-evaporation (MVR), multi-effect evaporation (MEC), and Submerged Combustion (SCE), but the drawbacks of each process are significant. The MVR or MEC process is used more, the operation stability is poor, the cleaning frequency is high, and a plurality of projects cannot be put into operation after construction is completed. The operation stability of the submerged combustion process is superior to that of MVR or MEC, but the investment and operation cost are very high, and the market demand cannot be met.

The humidification and dehumidification is a technology from the field of seawater desalination, the technology takes gas as a carrier, the gas is humidified in a humidifier and then enters a condenser to be condensed to obtain fresh water, a stock solution is concentrated in an evaporator, the temperature in the operation process of the method is generally below 90 ℃, the scaling tendency of the device is small, and a low-grade heat source can be utilized.

Disclosure of Invention

The invention provides a device and a method for treating salt-containing wastewater, which are used for overcoming the defects of slow humidification and dehumidification efficiency and low heat energy utilization rate in the salt-containing wastewater treatment in the prior art, realizing continuous and stable operation of the salt-containing wastewater treatment process, effectively reducing the operation cost, improving the recovery and utilization rate of heat energy, and being simple in system structure, low in manufacturing cost and suitable for treating various salt-containing wastewater.

The invention provides salt-containing wastewater treatment equipment which comprises humidification equipment and dehumidification equipment, wherein the humidification equipment comprises a stock solution conveying device, a humidification circulating liquid conveying device, a humidification heat exchanger and a humidification processing device, the dehumidification equipment comprises a dehumidification processing device, a dehumidification heat exchanger and a dehumidification circulating liquid conveying device, a heat absorption passage of the stock solution conveying device, a heat absorption passage of the humidification heat exchanger and a liquid inlet of the humidification processing device are sequentially communicated, an air outlet of the humidification processing device is communicated with an air inlet of the dehumidification processing device, a liquid outlet of the humidification processing device is communicated with the humidification circulating liquid conveying device, an air outlet of the dehumidification processing device is communicated with an air inlet of the humidification processing device, and a liquid outlet of the dehumidification processing device, the dehumidification circulating liquid conveying device and a heat release passage of the dehumidification heat exchanger are sequentially communicated with a liquid inlet of the dehumidification processing device.

According to the saline wastewater treatment equipment provided by the invention, the humidification circulating liquid conveying device comprises a first water tank, a dehydrator, a first pump body and a second pump body, wherein a first liquid inlet of the first water tank is communicated with a heat absorption passage of the dehumidification heat exchanger, a second liquid inlet of the first water tank is communicated with a liquid outlet of the humidification treatment device, a third liquid inlet of the first water tank is communicated with a liquid outlet of the dehydrator, a first liquid outlet of the first water tank and the first pump body are sequentially communicated with the heat absorption passage of the humidification heat exchanger, and a second liquid outlet of the first water tank and the second pump body are sequentially communicated with a liquid inlet of the dehydrator.

According to the salt-containing wastewater treatment equipment provided by the invention, the dehumidification circulating liquid conveying device comprises a second water tank and a third pump body, a liquid inlet of the second water tank is communicated with a liquid outlet of the dehumidification treatment device, and the liquid outlet of the second water tank, the third pump body and a heat release passage of the dehumidification heat exchanger are sequentially communicated.

According to the salt-containing wastewater treatment equipment provided by the invention, the air outlet of the dehumidification treatment device is communicated with the air inlet of the humidification treatment device through the main ventilation pipeline, and the main ventilation pipeline is provided with the air power device.

According to the salt-containing wastewater treatment equipment provided by the invention, an air outlet branch pipeline and an air inlet branch pipeline are sequentially arranged on the main air pipeline between the air outlet of the dehumidification treatment device and the air inlet of the aerodynamic device along the circulating air flow direction, a first valve and a tail gas treatment device are sequentially arranged on the air outlet branch pipeline along the circulating air flow direction, a second valve is arranged on the air inlet branch pipeline, and a third valve is arranged on the main air pipeline between the air outlet branch pipeline and the air inlet branch pipeline.

According to the salt-containing wastewater treatment equipment provided by the invention, the stock solution conveying device comprises a third water tank and a fourth pump body, and a liquid outlet of the third water tank and the fourth pump body are sequentially communicated with a heat absorption passage of the dehumidification heat exchanger.

According to the salt-containing wastewater treatment equipment provided by the invention, the humidification treatment device comprises a first tower body, and a first liquid uniform distribution assembly, a first filler and a first gas uniform distribution assembly which are sequentially arranged in the first tower body from top to bottom, wherein the first tower body is sequentially provided with an air outlet, a liquid inlet, an air inlet and a liquid outlet from top to bottom, the first liquid uniform distribution assembly is communicated with the liquid inlet of the first tower body, and the first gas uniform distribution assembly is arranged above the air inlet of the first tower body.

According to the salt-containing wastewater treatment equipment provided by the invention, the dehumidification treatment device comprises a second tower body, and a second liquid uniform distribution assembly, a second filler and a second gas uniform distribution assembly which are sequentially arranged in the second tower body from top to bottom, wherein the second tower body is sequentially provided with a gas outlet, a liquid inlet, a gas inlet and a liquid outlet from top to bottom, the second liquid uniform distribution assembly is communicated with the liquid inlet of the second tower body, and the second gas uniform distribution assembly is arranged above the gas inlet of the second tower body.

The salt-containing wastewater treatment equipment provided by the invention also comprises a control device, wherein a first temperature sensor, a first liquid level sensor and a conductivity sensor are arranged in the first water tank, a first valve body is arranged on a pipeline for connecting a heat release passage of the humidifying heat exchanger with an external heat source, a first liquid flow sensor is arranged on a pipeline for communicating a heat absorption passage of the humidifying heat exchanger with a liquid inlet of the humidifying treatment device, a gas flow sensor and a gas pressure sensor are also arranged on a pipeline for communicating a gas outlet of the aerodynamic device with a gas inlet of the humidifying treatment device, a second liquid flow sensor and a second temperature sensor are arranged on a pipeline for communicating a heat release passage of the dehumidifying heat exchanger with a liquid inlet of the dehumidifying treatment device, a second liquid level sensor is arranged in the second water tank, a second valve body is arranged on a water discharge pipeline of the second water tank, a third liquid level sensor is arranged in the third water tank, and the control device is connected with the first liquid level sensor, the conductivity sensor, the first valve body, the first pump body, the fourth pump body, the gas flow sensor, the gas pressure sensor, the aerodynamic device, the second liquid level sensor, the third liquid level sensor, the first valve body, the first liquid level sensor, the second liquid level sensor and the second liquid flow sensor.

The invention also provides a salt-containing wastewater treatment method applying the salt-containing wastewater treatment equipment, which comprises the following steps:

s1, lifting salt-containing wastewater from a third water tank through a fourth pump body, and allowing the salt-containing wastewater to enter a first water tank after passing through a dehumidifying heat exchanger; meanwhile, a third liquid level sensor monitors the liquid level of the third water tank in real time, and controls the operation of the fourth pump body through a control device according to the change of the liquid level;

s2, the humidifying circulating liquid is lifted from the first water tank through the first pump body, passes through the humidifying heat exchanger, and enters the first tower body after the temperature of the humidifying circulating liquid is raised to a set temperature range; meanwhile, a first temperature sensor monitors the temperature of the humidifying circulating liquid in the first water tank in real time, and the supply of an external heat source of the humidifying heat exchanger is controlled through a control device according to the change of the temperature;

s3, spraying the humidifying circulating liquid to the upper part of the first packing through the first liquid uniform distribution component and flowing along the first packing from top to bottom;

s4, circulating air is discharged from the second tower body through the aerodynamic device, flows from bottom to top along the first filler through the first gas uniform distribution assembly after entering the first tower body, and performs mass and heat transfer with the humidifying circulating liquid descending in the step S3 on the surface of the gap of the first filler; after mass transfer and heat transfer, fresh water in the humidifying circulating liquid is evaporated and carried out by circulating air, enters a second tower body, and the concentrated humidifying circulating liquid returns to the first water tank; meanwhile, the flow and the pressure of the circulating air are respectively monitored by a gas flow sensor and a gas pressure sensor, the change of the operating frequency of the aerodynamic device is controlled by a control device, and the wind speed and the wind pressure are adjusted;

s5, when the conductivity of the humidifying circulating liquid reaches the preset conductivity, starting the second pump body, starting the dehydrator, dehydrating and concentrating the humidifying circulating liquid, returning the clear liquid generated by concentration to the first water tank, and discharging the concentrated solid;

s6, circulating air discharged from the first tower body enters the second tower body, passes through the second gas uniform distribution assembly and flows from bottom to top along the second filler;

s7, the dehumidification circulating liquid is lifted from the second water tank through the third pump body, passes through the dehumidification heat exchanger and enters the second tower body;

s8, the dehumidification circulating liquid passes through the second liquid uniform distribution assembly, is sprayed to the upper part of the second filler and flows along the second filler from top to bottom, and performs mass and heat transfer with the circulating air rising in the step S6 on the surface of the second filler gap; after mass transfer and heat transfer, the fresh water in the circulating air is condensed and separated out by the dehumidification circulating liquid, the dehumidification circulating liquid absorbing the condensed fresh water returns to the second water tank, and the dehumidified circulating air enters the first tower body through the aerodynamic device;

and (5) repeating the steps S1 to S8 to finish the humidification and dehumidification treatment process of the salt-containing wastewater.

According to the method for treating the salt-containing wastewater provided by the invention, in the step S5, the conductivity of the humidifying circulating liquid entering the dehydrator is 250-350 ms/cm.

According to the salt-containing wastewater treatment equipment provided by the invention, the humidifying equipment is used for heating and warming salt-containing wastewater, evaporating and concentrating and dehydrating concentrated solution, and the dehumidifying equipment is used for condensing and separating fresh water in wet air and recycling heat of the fresh water. The salt-containing wastewater is conveyed to a heat absorption passage of a dehumidification heat exchanger by a stock solution conveying device, the salt-containing wastewater and dehumidification circulating liquid in a heat release passage of the dehumidification heat exchanger carry out primary heat exchange, the salt-containing wastewater is heated and enters a humidification circulating liquid conveying device, the salt-containing wastewater and pure water or salt-containing wastewater in the humidification circulating liquid conveying device are mixed to form humidification circulating liquid, the humidification circulating liquid conveying device conveys the humidification circulating liquid to a heat absorption passage of the humidification heat exchanger, the humidification circulating liquid and media in the heat release passage of the humidification heat exchanger carry out heat exchange again, the humidification circulating liquid is heated and enters a humidification processing device to carry out mass transfer and heat transfer with circulating air, fresh water in the humidification circulating liquid enters the dehumidification processing device along with circulating air in the humidification processing device after being evaporated, and the rest concentrated humidification circulating liquid returns to the humidification circulating liquid conveying device. Circulating air in the humidification treatment device carries fresh water evaporated by humidification circulating liquid to enter the dehumidification treatment device and carries out mass transfer and heat transfer with the dehumidification circulating liquid in the dehumidification treatment device, the dehumidification circulating liquid condenses and separates out the fresh water in the circulating air, the circulating air returns to the humidification treatment device again, the dehumidification circulating liquid after absorbing the condensed fresh water enters the dehumidification circulating liquid conveying device, the dehumidification circulating liquid conveying device conveys the dehumidification circulating liquid to the dehumidification heat exchanger to carry out preliminary heat exchange with salt-containing wastewater, and the dehumidification circulating liquid is cooled to enter the dehumidification treatment device.

The invention can realize continuous and stable operation of the salt-containing wastewater treatment process, effectively reduce the operation cost, the heat release passage of the humidifying heat exchanger can utilize a heat source with lower quality to exchange heat with the salt-containing wastewater of the heat absorption passage, and the residual temperature of the dehumidification circulating liquid discharged from the dehumidification treatment device is utilized to preliminarily heat the salt-containing wastewater at the dehumidification heat exchanger, thereby improving the recovery and utilization rate of heat energy. The waste heat with lower quality is utilized to heat the salt-containing wastewater, the circulating air is heated by the hot salt-containing wastewater in the humidification treatment device, so that the circulating air absorbs the fresh water in the salt-containing wastewater, and then the fresh water is condensed and separated out in the dehumidification treatment device, so that the salt-containing wastewater is further concentrated and reduced, and the mass transfer and heat transfer efficiency in the humidification and dehumidification process and the heat utilization efficiency of the whole system are improved. The process of humidifying and dehumidifying the salt-containing wastewater can be carried out in a normal pressure environment, the requirement on the quality of a heat source is low, the heat of fresh water is fully utilized for heat recovery, and energy is saved; the invention has small floor area and high space utilization rate, does not need to add external agents and is suitable for treating various salt-containing wastewater.

In addition to the technical problems addressed by the present invention, the technical features constituting the technical solutions and the advantages brought by the technical features of the technical solutions described above, other technical features of the present invention and the advantages brought by the technical features of the present invention will be further described with reference to the accompanying drawings or will be understood by the practice of the present invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic control flow diagram of a salt-containing wastewater treatment plant provided by the present invention;

FIG. 2 is a schematic diagram of the structure of a salt-containing wastewater treatment device provided by the invention;

FIG. 3 is a schematic diagram of the control structure of the salt-containing wastewater treatment plant provided by the invention;

reference numerals are as follows:

100: a humidifying device; 110: a dope delivery device; 120: a humidifying circulating liquid conveying device; 130: a humidifying heat exchanger; 140: a humidifying treatment device; 150: a first liquid flow sensor; 111: a third water tank; 112: a fourth pump body; 121: a first water tank; 122: a dehydrator; 123: a first pump body; 124: a second pump body; 141: a first tower body; 142: a first liquid uniform distribution assembly; 143: a first filler; 144: a first gas uniform distribution assembly; 1111: a third liquid level sensor; 1211: a first temperature sensor; 1212: a first liquid level sensor; 1213: a conductivity sensor;

200: a dehumidification device; 210: a dehumidification processing device; 220: a dehumidification heat exchanger; 230: a dehumidifying circulating liquid conveying device; 240: a second liquid flow sensor; 250: a second temperature sensor; 211: a second tower body; 212: the second liquid is uniformly distributed on the components; 213: a second filler; 214: a second gas uniform distribution assembly; 231: a second water tank; 232: a third pump body; 2311: a second liquid level sensor;

300: a primary vent line; 310: an aerodynamic device; 320: an air outlet branch pipeline; 330: an intake branch line; 340: a third valve; 321: a first valve; 322: a tail gas treatment device; 331: a second valve;

400: a control device; 500: a gas flow sensor; 600: a gas pressure sensor.

Detailed Description

The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention may be understood as specific cases by those of ordinary skill in the art.

In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

As shown in fig. 1 and fig. 2, the salt-containing wastewater treatment equipment provided by the embodiment of the present invention includes a humidification apparatus 100 and a dehumidification apparatus 200, the humidification apparatus 100 includes a raw liquid conveying device 110, a humidification circulating liquid conveying device 120, a humidification heat exchanger 130, and a humidification processing device 140, the dehumidification apparatus 200 includes a dehumidification processing device 210, a dehumidification heat exchanger 220, and a dehumidification circulating liquid conveying device 230, the raw liquid conveying device 110, a heat absorption passage of the dehumidification heat exchanger 220, the humidification circulating liquid conveying device 120, a heat absorption passage of the humidification heat exchanger 130, and a liquid inlet of the humidification processing device 140 are sequentially communicated, an air outlet of the humidification processing device 140 is communicated with an air inlet of the dehumidification processing device 210, a liquid outlet of the humidification processing device 140 is communicated with the humidification circulating liquid conveying device 120, an air outlet of the dehumidification processing device 210 is communicated with an air inlet of the humidification processing device 140, and a liquid outlet of the dehumidification circulating liquid conveying device 230, a heat release passage of the dehumidification heat exchanger 220 is sequentially communicated with a liquid inlet of the dehumidification processing device 210.

In the salt-containing wastewater treatment equipment of the embodiment of the invention, the humidifying equipment 100 is used for heating and heating salt-containing wastewater, evaporating and concentrating and dehydrating concentrated solution, and the dehumidifying equipment 200 is used for condensing and separating fresh water in humid air and recycling heat of the fresh water. The raw liquid conveying device 110 conveys salt-containing wastewater to a heat absorption passage of the dehumidifying heat exchanger 220, the salt-containing wastewater is subjected to primary heat exchange with dehumidifying circulation liquid in a heat release passage of the dehumidifying heat exchanger 220, the salt-containing wastewater is heated to enter the humidifying circulation liquid conveying device 120, the salt-containing wastewater is mixed with purified water or salt-containing wastewater in the humidifying circulation liquid conveying device to form humidifying circulation liquid, the humidifying circulation liquid conveying device 120 conveys the humidifying circulation liquid to a heat absorption passage of the humidifying heat exchanger 130, the humidifying circulation liquid is subjected to heat exchange with media in a heat release passage of the humidifying heat exchanger 130 again, the humidifying circulation liquid is heated to enter the humidifying treatment device 140 to be subjected to mass transfer and heat transfer with circulating air, fresh water in the humidifying circulation liquid is evaporated and then enters the dehumidifying treatment device 210 along with circulating air in the humidifying treatment device 140, and the rest of the humidifying circulation liquid returns to the humidifying circulation liquid conveying device 120. Circulating air in the humidification processing device 140 carries fresh water evaporated by humidification circulating liquid to enter the dehumidification processing device 210, and performs mass transfer and heat transfer with the dehumidification circulating liquid in the dehumidification processing device 210, the dehumidification circulating liquid condenses and separates out the fresh water in the circulating air, the circulating air returns to the humidification processing device 140 again, the dehumidification circulating liquid absorbing the condensed fresh water enters the dehumidification circulating liquid conveying device 230, the dehumidification circulating liquid conveying device 230 conveys the dehumidification circulating liquid to the dehumidification heat exchanger 220 to perform preliminary heat exchange with salt-containing wastewater, and the dehumidification circulating liquid is cooled to enter the dehumidification processing device 210.

The invention can realize continuous and stable operation of the salt-containing wastewater treatment process, effectively reduces the operation cost, the heat release passage of the humidifying heat exchanger 130 can utilize a heat source with lower quality to exchange heat with the salt-containing wastewater of the heat absorption passage, and the residual temperature of the dehumidification circulating liquid discharged from the dehumidification treatment device 210 is utilized to primarily heat the salt-containing wastewater at the dehumidification heat exchanger 220, thereby improving the recovery rate of heat energy. The waste heat with lower quality is used for heating the salt-containing wastewater, the circulating air is heated by the hot salt-containing wastewater in the humidification treatment device 140, so that the circulating air absorbs the fresh water in the salt-containing wastewater, and then the fresh water is condensed in the dehumidification treatment device 210, so that the salt-containing wastewater is further concentrated and reduced, and the mass transfer and heat transfer efficiency in the humidification and dehumidification process and the heat utilization efficiency of the whole system are improved. The process of humidifying and dehumidifying the salt-containing wastewater can be carried out in a normal pressure environment, the requirement on the quality of a heat source is low, the heat of fresh water is fully utilized for heat recovery, and energy is saved; the invention has small floor area and high space utilization rate, does not need to add exogenous medicaments, and is suitable for treating various saline wastewater.

In this embodiment, the humidifying heat exchanger 130 may be a plate heat exchanger, a tube heat exchanger or other heat exchange devices, or may be an electric heater, a solar heater or other heating devices. The dehumidifying heat exchanger 220 may be a plate heat exchanger, a tube heat exchanger or other heat exchange devices.

According to an embodiment of the present invention, the humidification circulating fluid delivery apparatus 120 includes a first water tank 121, a dewatering machine 122, a first pump body 123 and a second pump body 124, a first liquid inlet of the first water tank 121 is communicated with a heat absorption path of the dehumidification heat exchanger 220, a second liquid inlet of the first water tank 121 is communicated with a liquid outlet of the humidification processing apparatus 140, a third liquid inlet of the first water tank 121 is communicated with a liquid outlet of the dewatering machine 122, a first liquid outlet of the first water tank 121 and the first pump body 123 are sequentially communicated with a heat absorption path of the humidification heat exchanger 130, and a second liquid outlet of the first water tank 121 and the second pump body 124 are sequentially communicated with a liquid inlet of the dewatering machine 122. In this embodiment, the salt-containing wastewater passing through the dehumidifying heat exchanger 220 enters the first water tank 121 and is mixed with the humidification circulating fluid in the first water tank 121, the humidification circulating fluid in the first water tank 121 is pumped into the humidifying heat exchanger 130 by the first water pump, meanwhile, the concentrated humidification circulating fluid discharged from the humidification processing device 140 flows into the first water tank 121 and is mixed with the salt-containing wastewater, the humidification circulating fluid in the first water tank 121 is pumped into the dehydrator 122 by the second water pump, the dehydrator 122 further dehydrates and concentrates the humidification circulating fluid, clear liquid generated by concentration flows back to the humidification circulating fluid tank for reprocessing, and the concentrated high-salt-content solid is bagged and sealed and is transported to an industrial waste salt processing center for harmless treatment.

In this embodiment, the dehydrator 122 may be a plate-and-frame dehydrator, a centrifugal dehydrator, or another dehydrator.

According to an embodiment of the present invention, the dehumidifying cycle liquid conveying device 230 includes a second water tank 231 and a third pump body 232, a liquid inlet of the second water tank 231 is communicated with a liquid outlet of the dehumidifying processing device 210, and a liquid outlet of the second water tank 231, the third pump body 232 and a heat releasing path of the dehumidifying heat exchanger 220 are communicated in sequence. In this embodiment, the first water pump pumps the humidification circulating fluid in the first water tank 121 into the humidification heat exchanger 130, and simultaneously, the condensed fresh water discharged from the dehumidification processing apparatus 210 flows into the second water tank 231 to be mixed with the dehumidification circulating fluid in the second water tank 231, the dehumidification circulating fluid preferentially selects the condensed fresh water generated by the dehumidification processing apparatus 210, and the third water pump pumps the dehumidification circulating fluid in the second water tank 231 into the dehumidification heat exchanger 220 to be primarily thermally returned with the saline wastewater. The condensed fresh water in the second water tank 231 may be periodically discharged.

According to one embodiment of the present invention, the air outlet of the dehumidification processing device 210 is communicated with the air inlet of the humidification processing device 140 through a main ventilation pipeline 300, and an aerodynamic device 310 is disposed on the main ventilation pipeline 300. In this embodiment, the circulating air in the dehumidifying process unit 210 is sent to the dehumidifying process unit 210 through the air power unit 310, that is, the air power unit 310 is used for circulating air between the humidifying equipment 100 and the dehumidifying equipment 200, and the air power unit 310 may be a centrifugal fan, an axial fan or other fans.

According to an embodiment of the present invention, an air outlet branch pipe 320 and an air inlet branch pipe 330 are sequentially disposed on the main ventilation pipe 300 between the air outlet of the dehumidification processing device 210 and the air inlet of the aerodynamic device 310 along the direction of the air flow, a first valve 321 and a tail gas processing device 322 are sequentially disposed on the air outlet branch pipe 320 along the direction of the air flow, a second valve 331 is disposed on the air inlet branch pipe 330, and a third valve 340 is disposed on the main ventilation pipe 300 between the air outlet branch pipe 320 and the air inlet branch pipe 330. The circulating air discharged from the dehumidification processing apparatus 210 enters the main ventilation pipeline 300 and then is divided into two paths, one path continues to flow along the main ventilation pipeline 300, the other path flows through the tail gas processing apparatus 322 along the air outlet branch pipeline 320 and then is discharged outside, the air intake at the air inlet of the aerodynamic apparatus 310 is divided into two paths, one path is the circulating air entering along the main ventilation pipeline 300, and the other path is the outside air entering along the air inlet branch pipeline 330. The main ventilation pipeline 300, the air outlet branch pipeline 320 and the air inlet branch pipeline 330 are controlled by the switch cooperation of the first valve 321, the second valve 331 and the third valve 340, so as to realize the circulation mode of the circulating air in the humidification processing device 140 and the dehumidification processing device 210 in the air closed type and the air open type.

When the first valve 321 and the second valve 331 are both closed, and the third valve 340 is opened, that is, the main ventilation pipeline 300 is opened, and the inlet branch pipeline 330 and the outlet branch pipeline 320 are both closed, the humidification processing device 140 and the circulating air in the dehumidification processing device 210 form an air-closed type, the circulating air discharged from the air outlet of the dehumidification processing device 210 enters the humidification processing device 140 from the air inlet of the humidification processing device 140 under the action of the aerodynamic device 310, and the air in the humidification processing device 140 and the dehumidification processing device 210 is always circulated and not discharged outside. The method can be applied to the conditions that the original salt-containing wastewater has more pollution components and the pollution components in the circulating air are not easy to discharge and treat.

When the first valve 321 and the second valve 331 are both opened and the third valve 340 is closed, that is, the inlet branch pipe 330 and the outlet branch pipe 320 are opened, the main ventilation pipe 300 between the inlet of the humidification processing device 140 and the inlet branch pipe 330 is opened, and the main ventilation pipe 300 between the inlet branch pipe 330 and the outlet branch pipe 320 is closed, the humidification processing device 140 and the circulating air in the dehumidification processing device 210 form an air-open type, the aerodynamic device 310 can directly suck fresh air from the outside through the inlet branch pipe 330 and send the fresh air into the humidification processing device 140, the circulating air at the outlet of the dehumidification processing device 210 is processed by the tail gas processing device 322 on the outlet branch pipe 320, and after various pollutant concentration values reach the standard, the circulating air is evacuated and does not participate in the circulation any more. The method can be applied to the conditions that the original salt-containing wastewater has less pollution components and the pollution components in the circulating air are discharged outside and are easy to treat.

In this embodiment, the tail gas treatment device 322 selects an appropriate treatment type according to the components of the tail gas.

According to one embodiment of the present invention, the raw liquid conveying device 110 includes a third water tank 111 and a fourth pump body 112, and a liquid outlet of the third water tank 111 and the fourth pump body 112 are sequentially communicated with a heat absorption path of the dehumidification heat exchanger 220. In this embodiment, the saline wastewater is externally conveyed to enter the third water tank 111, impurities in the saline wastewater can be precipitated in the third water tank 111 in advance, and the fourth pump body 112 pumps the saline wastewater in the third water tank 111 into the dehumidifying heat exchanger 220 to perform preliminary heat exchange with the dehumidifying circulating fluid.

According to an embodiment of the present invention, the humidification processing device 140 includes a first tower body 141, and a first liquid uniform distribution assembly 142, a first packing 143, and a first gas uniform distribution assembly 144 sequentially disposed in the first tower body 141 from top to bottom, where the first tower body 141 is sequentially provided with an air outlet, a liquid inlet, an air inlet, and a liquid outlet from top to bottom, the first liquid uniform distribution assembly 142 is communicated with the liquid inlet of the first tower body 141, and the first gas uniform distribution assembly 144 is disposed above the air inlet of the first tower body 141. In this embodiment, the first tower body 141 is vertically disposed, an air outlet of circulating air carrying fresh water is disposed at the top of the first tower body 141, a liquid outlet of concentrated and humidified circulating liquid is disposed at the bottom, and a liquid inlet of the first liquid distribution assembly 142, a first filler 143 filled in the cross section of the first tower body 141, a first gas distribution assembly 144 disposed in the cross section of the first tower body 141, and an air inlet of the circulating air are sequentially disposed from top to bottom between the top and the bottom. The humidifying circulating liquid which is subjected to heat exchange and temperature rise in the humidifying heat exchanger 130 is uniformly sprayed to the upper part of the first packing 143 through the first liquid uniform distribution component 142 and flows from top to bottom along the gaps of the first packing 143. The aerodynamic device 310 sends the circulating air in the dehumidification processing device 210 into the first tower body 141, and the circulating air is uniformly distributed at the lower part of the first filler 143 through the first gas uniform distribution assembly 144, flows from bottom to top along the gaps of the first filler 143, and performs mass and heat transfer with the descending humidifying circulating liquid on the surfaces of the gaps of the first filler 143. After mass and heat transfer, a part of fresh water in the humidification circulating liquid is evaporated and carried out by the circulating air from the air outlet to enter the dehumidification processing device 210, and the concentrated humidification circulating liquid returns to the first water tank 121 through the liquid outlet.

In this embodiment, the cross-sectional area and height of the first packing 143 are designed mainly based on the specific surface area of the packing, the treatment capacity, temperature, physicochemical properties of the saline wastewater, and the circulation flow rate of the circulating air, and on the premise of not affecting the installation and normal operation of the first tower 141, the shape of the first packing 143 is preferably a thin and tall type, and the packing may be bulk packing or structured packing. The first liquid uniform distribution assembly 142 can select a spray pipe perforating mode, a spiral spray head or a hollow cone spray head.

According to an embodiment of the present invention, the dehumidification processing apparatus 210 includes a second tower body 211, and a second liquid distribution assembly 212, a second filler 213, and a second gas distribution assembly 214 sequentially disposed in the second tower body 211 from top to bottom, where the second tower body 211 sequentially includes a gas outlet, a liquid inlet, a gas inlet, and a liquid outlet from top to bottom, the second liquid distribution assembly 212 is communicated with the liquid inlet of the second tower body 211, and the second gas distribution assembly 214 is disposed above the gas inlet of the second tower body 211. In this embodiment, the second tower body 211 is vertically arranged, the top of the second tower body 211 is provided with an air outlet of circulating air, the bottom of the second tower body 211 is provided with a liquid outlet of condensed fresh water, and the top-down between the top and the bottom is sequentially provided with a liquid inlet for arranging the second liquid uniform distribution component 212, a second filler 213 filled in the cross section of the second tower body 211, a second gas uniform distribution component 214 arranged in the cross section of the second tower body 211 and an air inlet of circulating air carrying fresh water. The heat exchange is carried out in the dehumidifying heat exchanger 220, and the warm dehumidifying circulation liquid is uniformly sprayed to the upper part of the second filler 213 through the second liquid uniform distribution component 212 and flows from top to bottom along the gap of the second filler 213. The circulating air carrying fresh water in the humidification processing device 140 is sent into the second tower body 211, is uniformly distributed at the lower part of the second filler 213 through the second gas uniform distribution component 214, flows from bottom to top along the gap of the second filler 213, and performs mass and heat transfer with the descending dehumidification circulating liquid on the surface of the gap of the second filler 213. After mass transfer and heat transfer, a part of fresh water in the dehumidification circulating liquid is condensed and separated out, the dehumidification circulating liquid absorbing the condensed fresh water returns to the second water tank 231 through the liquid outlet, and the air power device 310 sends the dehumidified circulating air in the dehumidification processing device 210 to the first tower body 141 through the air outlet.

In this embodiment, the cross-sectional area and height of the second filler 213 are designed mainly based on the specific surface area of the filler, the treatment capacity, temperature, physicochemical properties of the saline wastewater, and the circulation flow rate of the circulating air, and on the premise of not affecting the installation and normal operation of the second tower 211, the second filler 213 has a good shape of thin and tall, and the filler may be bulk filler or structured filler. The second liquid uniform distribution component 212 can select a spray pipe perforating mode, a spiral spray head or a hollow cone spray head.

As shown in fig. 2 and fig. 3, according to an embodiment provided by the present invention, the apparatus for treating wastewater containing salt in the embodiment of the present invention further includes a control device 400, a first temperature sensor 1211, a first liquid level sensor 1212, and a conductivity sensor 1213 are disposed in the first water tank 121, a first valve body is disposed on a pipeline connecting a heat release path of the humidification heat exchanger 130 with an external heat source, a first liquid flow sensor 150 is disposed on a pipeline connecting a heat absorption path of the humidification heat exchanger 130 with a liquid inlet of the humidification processing device 140, a gas flow sensor 500 and a gas pressure sensor 600 are further disposed on a pipeline connecting an air outlet of the dehumidification processing device 210 with an air inlet of the humidification processing device 140, a second liquid flow sensor 240 and a second temperature sensor 250 are disposed on a pipeline connecting a heat release path of the dehumidification heat exchanger 220 with a liquid inlet of the dehumidification processing device 210, a second liquid level sensor 2311 is disposed in the second water tank 231, a second valve body is disposed on a pipeline connecting the second water tank 231, a third liquid level sensor 1111 is disposed in the third water tank 111, the control device 400 is connected with the first temperature sensor 1211, the first liquid level sensor 1212, the first conductivity sensor 1212, the first valve body 123, the fourth pump body 112, the second liquid level sensor 150, the second liquid level sensor 200, the second liquid flow sensor 1111, the second liquid level sensor 200, and the second dynamic liquid flow sensor 1111, the second dynamic liquid level sensor 110, and the pump body 232, and the second dynamic liquid flow sensor 250. In this embodiment, the control device 400 is a PLC automatic control device, and forms an automatic monitoring control device with the valve bodies and sensors in the system, and is used for automatic monitoring and automatic regulation control of indexes such as liquid level, conductivity, temperature, air volume and the like of the saline wastewater in the humidification and dehumidification treatment process. The invention can realize automatic continuous stable operation of the salt-containing wastewater treatment process, reduce the labor consumption, effectively reduce the operation cost and be suitable for the treatment of various salt-containing wastewater.

The third liquid level sensor 1111 is configured to monitor a liquid level of the saline wastewater contained in the third tank 111 in real time, and transmit a liquid level signal to the control device 400, and the control device 400 controls the operation of the fourth pump body 112 according to a liquid level variation signal.

The first temperature sensor 1211 is used for monitoring the temperature of the humidification circulation liquid in the first water tank 121 in real time, and transmitting a temperature signal to the control device 400, and the control device 400 controls the supply of the external heat source of the humidification heat exchanger 130 according to a change signal of the temperature. When the temperature of the humidification circulating liquid in the first water tank 121 is higher than the upper limit value of the set temperature range, the first valve body on the heat release passage of the humidification heat exchanger 130 is automatically closed, the humidification circulating liquid is not heated any more, and when the temperature of the humidification circulating liquid in the first water tank 121 is lower than the lower limit value of the set temperature range, the first valve body is automatically opened, and the humidification circulating liquid is continuously heated.

The first liquid level sensor 1212 is configured to monitor a liquid level of the humidification circulating fluid in the first water tank 121 in real time, and transmit a liquid level signal to the control device 400, and the control device 400 controls the operation of the first pump 123 and the first valve according to a liquid level variation signal. When the liquid level of the humidifying circulating liquid in the first water tank 121 is lower than the lower limit value of the set liquid level range, the first pump body 123 automatically stops running, and correspondingly, the first valve body is automatically closed; when the liquid level of the humidifying circulating liquid is higher than the lower limit value of the set liquid level range, the first pump body 123 automatically starts to operate, and correspondingly, the first valve body automatically opens; when the liquid level of the humidifying circulating liquid is higher than the upper limit value of the set liquid level range, the first pump body 123 automatically stops running, and correspondingly, the first valve body automatically closes; when the liquid level of the humidifying circulating liquid is lower than the upper limit value of the set liquid level range, the first pump body 123 automatically starts to operate, and correspondingly, the first valve body automatically opens.

The first liquid flow sensor 150 is used for monitoring the flow rate of the humidification circulating liquid entering the first tower body 141 in real time, and transmitting a flow rate signal to the control device 400, and the control device 400 controls the operation of the first pump body 123 according to a flow rate change signal.

The gas flow sensor 500 is used for monitoring the flow of the circulating air in real time, the gas pressure sensor 600 is used for detecting the pressure of the circulating air in real time, the flow signal and the pressure signal are transmitted to the control device 400, and the control device 400 controls the frequency of the aerodynamic device 310 according to the change signals of the flow and the pressure, so as to adjust the proper wind speed and wind pressure.

The conductivity sensor 1213 is used for monitoring the conductivity of the humidification circulating fluid in the first water tank 121 in real time, and transmitting a conductivity signal to the control device 400, and the control device 400 controls the operation of the second pump body 124 according to the change signal of the conductivity. When the conductivity of the humidifying circulation liquid in the first water tank 121 reaches a set value and the liquid level is in a normal operation range, the second pump body 124 is automatically started, and the dehydrator 122 is automatically started in a chain manner.

The second liquid flow sensor 240 is configured to monitor a flow rate of the dehumidification circulation liquid entering the second tower body 211 in real time, and transmit a flow rate signal to the control device 400, where the control device 400 controls the third pump body 232 to operate according to a flow rate change signal.

The second temperature sensor 250 is configured to monitor the temperature of the dehumidification circulation fluid after being cooled by the dehumidification heat exchanger 220 in real time, and transmit a temperature signal to the control device 400, and the control device 400 controls the third pump body 232 to operate according to a temperature change signal.

The second liquid level sensor 2311 is configured to monitor a liquid level of the dehumidification circulation liquid in the second water tank 231 in real time, transmit a liquid level signal to the control device 400, and the control device 400 controls the third pump 232 and the second valve according to a change signal of the liquid level. When the liquid level of the dehumidification circulation liquid in the second water tank 231 is lower than the set liquid level lower limit value, the third pump body 232 automatically stops running; when the liquid level of the dehumidification circulation liquid is higher than the lower limit value of the set liquid level range, the third pump 232 automatically starts to operate. In addition, when the liquid level of the dehumidification circulating liquid is higher than the set upper limit value of the liquid level range, the second valve body is automatically opened, and when the liquid level of the dehumidification circulating liquid is lower than the set upper limit value of the liquid level range by a certain value, the second valve body is automatically closed.

As shown in fig. 1, fig. 2 and fig. 3, an embodiment of the present invention further provides a method for treating saline wastewater using the saline wastewater treatment plant of the above embodiment, including:

s1, salt-containing wastewater is lifted from a third water tank 111 through a fourth pump body 112, and enters a first water tank 121 after heat is recycled through heat exchange between a dehumidification heat exchanger 220 and dehumidification circulating liquid; meanwhile, the third liquid level sensor 1111 monitors the liquid level of the third water tank 111 in real time and controls the operation of the fourth pump body 112 through the control device 400 according to the change of the liquid level;

s2, the humidifying circulating liquid is lifted from the first water tank 121 through the first pump body 123, exchanges heat with an external heat source through the humidifying heat exchanger 130, and enters the first tower body 141 after the temperature of the humidifying circulating liquid is increased to be within a set temperature range; meanwhile, the first temperature sensor 1211 monitors the temperature of the humidification circulation liquid in the first water tank 121 in real time, and controls the supply of the external heat source of the humidification heat exchanger 130 through the control device 400 according to the change of the temperature;

when the temperature of the humidification circulating liquid in the first water tank 121 is higher than the upper limit value of the set temperature range, the first valve body on the heat release passage of the humidification heat exchanger 130 is automatically closed, the humidification circulating liquid is not heated any more, and when the temperature of the humidification circulating liquid in the first water tank 121 is lower than the lower limit value of the set temperature range, the first valve body is automatically opened, and the humidification circulating liquid is continuously heated.

In the process, when the liquid level of the humidifying circulating liquid in the first water tank 121 is lower than the lower limit value of the first set liquid level range, the first pump body 123 automatically stops running, and correspondingly, the first valve body is automatically closed; when the liquid level of the humidifying circulating liquid is higher than the lower limit value of the first set liquid level range, the first pump body 123 automatically starts to operate, and correspondingly, the first valve body automatically opens; when the liquid level of the humidifying circulating liquid is higher than the upper limit value of the first set liquid level range, the first pump body 123 automatically stops running, and correspondingly, the first valve body is automatically closed; when the liquid level of the humidifying circulating liquid is lower than the upper limit value of the first set liquid level range, the first pump body 123 automatically starts to operate, and correspondingly, the first valve body automatically opens.

S3, after entering the upper part of the first tower body 141, the humidifying circulating liquid is uniformly sprayed to the upper part of the first packing 143 and flows from top to bottom along gaps of the first packing 143 under the action of the first liquid uniform distribution component 142;

the first liquid flow sensor 150 is configured to monitor a flow rate of the humidified circulating liquid entering the first tower 141 in real time, and transmit a flow rate signal to the control device 400, and the control device 400 controls the operation of the first pump 123 according to a flow rate variation signal.

S4, circulating air is discharged from the second tower body 211 through the aerodynamic device 310, enters the first tower body 141, passes through the first gas uniform distribution assembly 144, is uniformly distributed at the lower part of the first filler 143, flows from bottom to top along the gaps of the first filler 143, and performs mass and heat transfer with the humidifying circulating liquid descending in the step S3 on the surfaces of the gaps of the first filler 143; after mass transfer and heat transfer, the fresh water in the humidification circulating liquid is evaporated and carried out through circulating air, enters the second tower body 211, and the concentrated humidification circulating liquid returns to the first water tank 121; meanwhile, the flow and pressure of the circulating air are respectively monitored by the gas flow sensor 500 and the gas pressure sensor 600, and the operation frequency change of the aerodynamic device 310 is controlled by the control device 400 to adjust the wind speed and the wind pressure;

s5, when the conductivity of the humidifying circulating liquid reaches the preset conductivity and the liquid level of the humidifying circulating liquid is within the normal operation range, starting the second pump body 124, starting the dehydrator 122 automatically in a chain manner, further dehydrating and concentrating the humidifying circulating liquid, returning the concentrated clear liquid to the first water tank 121, discharging the concentrated solid, bagging and sealing, and conveying the solid to an industrial waste salt treatment center for harmless treatment;

s6, the circulating air discharged from the first tower body 141 enters the second tower body 211, passes through the second gas uniform distribution assembly 214, is uniformly distributed at the lower part of the second filler 213 and flows from bottom to top along the gap of the second filler 213;

s7: the dehumidification circulating liquid is lifted from the second water tank 231 through the third pump body 232, exchanges heat with the salt-containing wastewater through the dehumidification heat exchanger 220, is cooled to a second preset temperature range, and enters the second tower body 211;

the second liquid flow sensor 240 is configured to monitor a flow rate of the dehumidification circulation fluid entering the second tower 211 in real time, and transmit a flow rate signal to the control device 400, and the control device 400 controls the operation of the third pump 232 according to a flow rate variation signal. The second temperature sensor 250 is configured to monitor the temperature of the dehumidification circulation fluid after being cooled by the dehumidification heat exchanger 220 in real time, and transmit a temperature signal to the control device 400, and the control device 400 controls the operation of the third pump body 232 according to a temperature change signal.

In the process, when the liquid level of the dehumidification circulating liquid in the second water tank 231 is lower than the second set liquid level lower limit value, the third pump body 232 automatically stops running; when the liquid level of the dehumidification circulation liquid is higher than the lower limit value of the second set liquid level range, the third pump body 232 automatically starts to operate. In addition, when the liquid level of the dehumidification circulating liquid is higher than the upper limit value of the second set liquid level range, the second valve body is automatically opened, and when the liquid level of the dehumidification circulating liquid is lower than the upper limit value of the second set liquid level range by a certain value, the second valve body is automatically closed.

S8, after the dehumidification circulating liquid enters the upper part of the second tower body 211, the dehumidification circulating liquid is uniformly sprayed to the upper part of the second filler 213 and flows from top to bottom along the gap of the second filler 213 under the action of the second liquid uniform distribution assembly 212, and the dehumidification circulating liquid and the circulating air rising in the step S6 perform mass and heat transfer on the surface of the gap of the second filler 213; after mass transfer and heat transfer, the fresh water in the circulating air is condensed and separated out by the dehumidification circulating liquid, the dehumidification circulating liquid absorbing the condensed fresh water returns to the second water tank 231, and the dehumidified circulating air enters the first tower body 141 through the aerodynamic device 310;

and repeating the steps S1 to S8 to finish the humidification and dehumidification treatment process of the salt-containing wastewater.

According to one embodiment of the present invention, in step S5, the conductivity of the humidification circulating liquid entering the dehydrator 122 is 250 to 350ms/cm. In this embodiment, the conductivity of the potential-increasing circulation liquid before dehydration is set to a value of 250 to 350ms/cm, preferably 300ms/cm.

When in use, the valve body and the valve are not limited to be stop valves, electric valves, electromagnetic valves or other valves which can be opened and closed.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (11)

1. The utility model provides a contain salt waste water treatment equipment which characterized in that: the system comprises humidification equipment and dehumidification equipment, wherein the humidification equipment comprises a stock solution conveying device, a humidification circulating liquid conveying device, a humidification heat exchanger and a humidification processing device, the dehumidification equipment comprises a dehumidification processing device, a dehumidification heat exchanger and a dehumidification circulating liquid conveying device, the stock solution conveying device, a heat absorption passage of the dehumidification heat exchanger, the humidification circulating liquid conveying device, a heat absorption passage of the humidification heat exchanger and a liquid inlet of the humidification processing device are sequentially communicated, a gas outlet of the humidification processing device is communicated with a gas inlet of the dehumidification processing device, a liquid outlet of the humidification processing device is communicated with the humidification circulating liquid conveying device, a gas outlet of the dehumidification processing device is communicated with a gas inlet of the humidification processing device, and a liquid outlet of the dehumidification processing device, the dehumidification circulating liquid conveying device and a heat release passage of the dehumidification heat exchanger are sequentially communicated with a liquid inlet of the dehumidification processing device; fresh water in the humidification circulating liquid enters the dehumidification processing device along with circulating air in the humidification processing device after being evaporated, and the rest concentrated humidification circulating liquid returns to the humidification circulating liquid conveying device which conveys the humidification circulating liquid to a heat absorption passage of the humidification heat exchanger; the humidifying circulating liquid conveying device comprises a first water tank, and a second liquid inlet of the first water tank is communicated with a liquid outlet of the humidifying treatment device.

2. The facility for treating wastewater containing salt according to claim 1, characterized in that: humidification circulation liquid conveyor includes hydroextractor, the first pump body and the second pump body, the first inlet of first water tank with dehumidification heat exchanger's heat absorption route intercommunication, the third inlet of first water tank with the liquid outlet intercommunication of hydroextractor, the first liquid outlet of first water tank the first pump body with humidification heat exchanger's heat absorption route communicates in proper order, the second liquid outlet of first water tank the second pump body with the inlet of hydroextractor communicates in proper order.

3. The apparatus for treating wastewater containing salt according to claim 2, characterized in that: dehumidification circulation liquid conveyor includes the second water tank and the third pump body, the inlet of second water tank with dehumidification processing apparatus's liquid outlet intercommunication, the liquid outlet of second water tank, the third pump body and the heat release path of dehumidification heat exchanger communicates in proper order.

4. The apparatus for treating wastewater containing salt according to claim 3, wherein: the air outlet of the dehumidification processing device is communicated with the air inlet of the humidification processing device through a main ventilation pipeline, and an air power device is arranged on the main ventilation pipeline.

5. The apparatus for treating wastewater containing salt according to claim 4, wherein: dehumidification processing apparatus's gas outlet with between aerodynamic device's the main breather pipe way is gone up and is equipped with in proper order along the circulating air flow direction and give vent to anger branch pipe way and inlet branch pipe way, it is equipped with first valve and tail gas processing apparatus in proper order to give vent to anger branch pipe way along the circulating air flow direction on the road, be equipped with the second valve on the inlet branch pipe way, give vent to anger branch pipe way with between the inlet branch pipe way be equipped with the third valve on the main breather pipe way.

6. The apparatus for treating wastewater containing salt according to claim 5, wherein: the stock solution conveying device comprises a third water tank and a fourth pump body, and a liquid outlet of the third water tank and the fourth pump body are communicated with a heat absorption passage of the dehumidification heat exchanger in sequence.

7. The brine wastewater treatment plant according to any one of claims 1 to 6, characterized in that: humidification processing apparatus include first tower body and top-down set gradually in first liquid equipartition subassembly, first filler and first gas equipartition subassembly in the first tower body, first tower body top-down is equipped with gas outlet, inlet, air inlet and liquid outlet in proper order, first liquid equipartition subassembly with the inlet intercommunication of first tower body, first gas equipartition subassembly set up in the top of the air inlet of first tower body.

8. The apparatus for treating wastewater containing salt according to claim 7, wherein: dehumidification processing apparatus include second tower body and top-down set gradually in second liquid equipartition subassembly, second filler and the gaseous equipartition subassembly of second in the second tower body, second tower body top-down is equipped with gas outlet, inlet, air inlet and liquid outlet in proper order, second liquid equipartition subassembly with the inlet intercommunication of second tower body, the gaseous equipartition subassembly of second set up in the top of the air inlet of second tower body.

9. The apparatus for treating wastewater containing salt according to claim 6, wherein: still include controlling means, be equipped with first temperature sensor, first level sensor and conductivity sensor in the first water tank, be equipped with first valve body on the pipeline that the exothermic passageway of humidification heat exchanger and external heat source are connected, the endothermic passageway of humidification heat exchanger with be equipped with first liquid flow sensor on the pipeline of humidification processing apparatus's inlet intercommunication, aerodynamic device's gas outlet with still be equipped with gas flow sensor and gas pressure sensor on the pipeline of humidification processing apparatus's air inlet intercommunication, the exothermic passageway of dehumidification heat exchanger with be equipped with second liquid flow sensor and second temperature sensor on the pipeline of dehumidification processing apparatus's inlet intercommunication, be equipped with second liquid level sensor in the second water tank, be equipped with the second valve body on the drainage pipe of second water tank, be equipped with third level sensor in the third water tank, controlling means with first temperature sensor first liquid level sensor conductivity sensor first valve body the first pump body the fourth pump body gas flow sensor gas pressure sensor the aerodynamic device the second pump body the first liquid flow sensor, second liquid flow sensor and second liquid flow sensor the second liquid level sensor the liquid flow sensor is connected.

10. A method for treating salt-containing wastewater using the salt-containing wastewater treatment facility according to any one of claims 1 to 9, characterized in that: the method comprises the following steps:

s1, lifting salt-containing wastewater from a third water tank through a fourth pump body, and allowing the salt-containing wastewater to enter a first water tank after passing through a dehumidifying heat exchanger; meanwhile, a third liquid level sensor monitors the liquid level of the third water tank in real time and controls the operation of the fourth pump body through a control device according to the change of the liquid level;

s2, the humidifying circulating liquid is lifted from the first water tank through the first pump body, passes through the humidifying heat exchanger, and enters the first tower body after the temperature of the humidifying circulating liquid is raised to a set temperature range; meanwhile, a first temperature sensor monitors the temperature of the humidifying circulating liquid in the first water tank in real time, and the supply of an external heat source of the humidifying heat exchanger is controlled through a control device according to the change of the temperature;

s3, spraying the humidifying circulating liquid to the upper part of the first packing through the first liquid uniform distribution component and flowing along the first packing from top to bottom;

s4, circulating air is discharged from the second tower body through the aerodynamic device, flows from bottom to top along the first filler through the first gas uniform distribution assembly after entering the first tower body, and performs mass and heat transfer with the humidifying circulating liquid descending in the step S3 on the surface of the gap of the first filler; after mass transfer and heat transfer, fresh water in the humidifying circulating liquid is evaporated and carried out through circulating air, enters a second tower body, and the concentrated humidifying circulating liquid returns to the first water tank; meanwhile, the flow and the pressure of the circulating air are respectively monitored by a gas flow sensor and a gas pressure sensor, the change of the operating frequency of the aerodynamic device is controlled by a control device, and the wind speed and the wind pressure are adjusted;

s5: when the conductivity of the humidifying circulating liquid reaches the preset conductivity, the second pump body is started, the dehydrator is started, the humidifying circulating liquid is dehydrated and concentrated, clear liquid generated by concentration flows back to the first water tank, and the concentrated solid is discharged;

s6: circulating air discharged from the first tower body enters the second tower body, passes through the second gas uniform distribution assembly and flows from bottom to top along the second filler;

s7: the dehumidification circulating liquid is lifted from the second water tank through the third pump body, passes through the dehumidification heat exchanger and enters the second tower body;

s8: the dehumidification circulating liquid passes through the second liquid uniform distribution assembly, is sprayed to the upper part of the second filler and flows from top to bottom along the second filler, and performs mass and heat transfer with the circulating air rising in the step S6 on the surface of the second filler gap; after mass transfer and heat transfer, the fresh water in the circulating air is condensed and separated out by the dehumidification circulating liquid, the dehumidification circulating liquid absorbing the condensed fresh water returns to the second water tank, and the dehumidified circulating air enters the first tower body through the aerodynamic device;

and repeating the steps S1 to S8 to finish the humidification and dehumidification treatment process of the salt-containing wastewater.

11. The method for treating wastewater containing salt according to claim 10, characterized in that: in step S5, the conductivity of the humidifying circulating liquid entering the dehydrator is 250-350 ms/cm.

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