Desulfurization wastewater treatment device

Abstract

The utility model relates to the technical field of wastewater environment-friendly treatment, in particular to a desulfurization wastewater treatment device. The desulfurization wastewater treatment device comprises wastewater treatment equipment, the wastewater treatment equipment is used for concentrating wastewater, and the wastewater treatment equipment comprises a separator, an evaporator and a centrifuge. The evaporator is connected with the separator, and waste liquid circulates between the evaporator and the separator to form a circulation main path; the centrifuge is arranged on a branch of the circulation main path to form a circulation branch; according to the desulfurization wastewater treatment device provided by the utility model, solid particles in wastewater are separated by the centrifuge through the centrifugal action, and then the wastewater containing the solid particles is discharged by the centrifuge, so that the content of the solid particles in the wastewater is reduced, and scaling is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of waste water environmental protection treatment, in particular to a desulfurization waste water treatment device and process. Background Art

[0002] In the production activities of coal-fired power plants, after the waste water is utilized in a cascade manner, the discharge amount has been significantly reduced. However, when it reaches the desulfurization process section, the generated desulfurization waste water has become a problem. No matter what treatment method is adopted, it is difficult to achieve up-to-standard discharge. In recent years, newly built power plants generally require zero discharge of waste water, and the requirements for discharge indexes of old power plants are also becoming increasingly strict. This has prompted new and old power plants to focus on the most difficult-to-treat waste water - desulfurization waste water, and strive to achieve zero discharge.

[0003] However, when using the existing technology to treat these waste waters, problems also arise. As the waste water is continuously concentrated, the concentrations of calcium sulfate particles and other suspended matter particles increase sharply, resulting in a significant increase in the scaling tendency. Even at high flow rates, it is difficult to completely prevent the formation of scale, and ultimately, a large amount of scale may form inside the treatment equipment, leading to shutdown problems. Summary of the Utility Model

[0004] In view of this, the purpose of the utility model is to overcome the deficiencies in the existing technology and provide a desulfurization waste water treatment device and process.

[0005] The utility model provides the following technical solutions:

[0006] An embodiment of the present application provides a desulfurization waste water treatment device, including a waste water treatment device for concentrating waste water. The waste water treatment device includes a separator, an evaporator, and a centrifuge. The separator is used for vapor-liquid separation treatment; the evaporator is connected to the separator, and the evaporator is used for heating the waste liquid transported from the separator. The waste liquid circulates between the evaporator and the separator to form a main circulation path; the centrifuge is arranged on a branch of the main circulation path to form a circulation branch. The waste liquid in the separator is simultaneously transported to the evaporator and the centrifuge; N waste water treatment devices are provided, and the N waste water treatment devices are respectively the first waste water treatment device, the second waste water treatment device,..., the Nth waste water treatment device from upstream to downstream, where N≥2. The separator of the first waste water treatment device is connected to a waste water source; the steam generated by the separator of the waste water treatment device upstream is introduced into the evaporator of the adjacent waste water treatment device downstream, and the separator of the waste water treatment device upstream is connected to the separator of the adjacent waste water treatment device downstream to transport the waste water from upstream to downstream.

[0007] In one embodiment, the water outlet direction of the water inlet of the centrifuge is tangential to the water inlet.

[0008] In one embodiment, a concentrated liquid outlet is provided at the bottom of the centrifuge; the desulfurized wastewater treatment device further includes a concentrated liquid tank, and the concentrated liquid tank is connected to the concentrated liquid outlets of the centrifuges of each of the wastewater treatment devices to collect wastewater containing solid particles.

[0009] In one embodiment, the centrifuge is a hydrocyclone, the hydrocyclone includes a cylindrical chamber and a conical chamber, the cylindrical chamber and the conical chamber are connected and the cylindrical chamber and the conical chamber are arranged in sequence along the direction of gravity, the water inlet is arranged in the cylindrical chamber, and the concentrated liquid outlet is arranged at the bottom of the conical chamber.

[0010] In one embodiment, the desulfurized wastewater treatment device further includes a condenser, and the separator of the Nth wastewater treatment device is connected to the condenser to condense the steam in the separator of the Nth wastewater treatment device into water.

[0011] In one embodiment, the desulfurized wastewater treatment device further includes a regulating valve, the regulating valve is arranged on the circulating branch, and the regulating valve is located between the centrifuge and the main circulating path to regulate the amount of wastewater discharged from the main circulating path into the circulating branch.

[0012] In one embodiment, the desulfurized wastewater treatment device further includes a preheater, the preheater is arranged between the wastewater source and the separator of the first wastewater treatment device to preheat the wastewater entering the separator of the first wastewater treatment device, and the evaporators of the second wastewater treatment device, ……, the Nth wastewater treatment device are connected to the preheater to provide a heat source for heating the wastewater for the preheater.

[0013] An embodiment of the present application further provides a desulfurized wastewater treatment process, which is implemented by using the desulfurized wastewater treatment device described in any of the above embodiments. The steps of the process include:

[0014] Perform multi-stage evaporation and concentration on the wastewater. In each stage of evaporation and concentration, a main circulation path is set to perform concentrated treatment of heating and vapor-liquid separation on the wastewater in a cycle. A circulating branch is set on the main circulation path to perform centrifugal separation on the solid particles in the wastewater in the main circulation path; the wastewater is preheated before entering the first-stage evaporation and concentration treatment; the steam generated by the previous-stage evaporation and concentration treatment of the wastewater is used to provide a heat source for heating the wastewater in the main circulation path of the next-stage evaporation and concentration; before the wastewater enters the first-stage evaporation and concentration, the wastewater is heated first. The steam for heating the wastewater in other stages of evaporation and concentration except the first-stage evaporation and concentration forms condensed water after condensation, and the residual temperature of the condensed water provides a heat source for preheating the wastewater before entering the first-stage evaporation and concentration.

[0015] In one embodiment, the wastewater circulation volume of the circulation branch is V, and the wastewater circulation volume of the main circulation path is V1, where 0.005V2 ≤ V1 ≤ 0.025V2.

[0016] In one embodiment, the wastewater circulation volume of the circulation branch is equal to the amount of wastewater introduced from the wastewater source into the first-stage evaporation and concentration.

[0017] The desulfurized wastewater treatment device provided by the embodiment of the present invention has the following advantages:

[0018] The centrifuge separates the solid particles in the wastewater through centrifugal force. Subsequently, the centrifuge discharges the separated solid particles, while the relatively clear wastewater is subjected to subsequent treatment to reduce the content of solid particles in the wastewater and reduce scaling. In the prior art, during the continuous concentration of wastewater, the concentration of calcium sulfate particles or other suspended solid particles becomes higher and higher, and the scaling tendency becomes greater and greater. The high-speed flow can no longer prevent the formation of scale, which will inevitably cause scaling, and in severe cases, even cause the shutdown of the machine. In the embodiment of the present application, through the centrifuge, the substances causing scaling in part of the wastewater are separated and discharged by centrifugal force, reducing scaling, reducing the shutdown frequency, and improving production efficiency.

[0019] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0021] Figure 1 The figure shows a schematic diagram of one of the embodiments of a desulfurized wastewater treatment device provided by the embodiment of the present application.

[0022] MAIN ELEMENT SYMBOL DESCRIPTION:

[0023] 100 - First wastewater treatment equipment; 200 - Second wastewater treatment equipment; 300 - Third wastewater treatment equipment;

[0024] 410 - Separator; 420 - Evaporator; 430 - Centrifuge; 440 - Adjusting valve; 450 - Circulation pump; 460 - Preheater; 470 - Condenser; 480 - Wastewater source; 490 - Steam source; 495 - Condensate;

[0025] 500 - Concentrate tank. Detailed implementation manners

[0026] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0027] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be intermediate elements at the same time. On the contrary, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0028] In the present utility model, unless otherwise clearly defined and limited, the terms such as "installed", "connected", "coupled", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality of" is two or more unless otherwise specifically defined.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this template herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0031] In a first aspect, an embodiment of the present application provides a desulfurized wastewater treatment device that can perform evaporation and concentration treatment on the wastewater after desulfurization. The desulfurized wastewater treatment device includes wastewater treatment equipment for concentrating the wastewater. The wastewater treatment equipment includes a separator 410, an evaporator 420, and a centrifuge 430.

[0032] The separator 410 is used for vapor-liquid separation treatment.

[0033] The evaporator 420 is connected to the separator 410 and is used for heating the waste liquid conveyed from the separator 410. Exemplarily, the connection means that the two are directly or indirectly connected through a pipeline or a mechanical mechanism, enabling the liquid to flow between the two. Exemplarily, the evaporator 420 uses steam as a heat source to heat the waste liquid. The evaporator 420 has a steam inlet and a condensate outlet. Steam enters the evaporator 420 from the steam inlet, condenses into water after exchanging heat with the wastewater, and the condensate 495 is discharged through the condensate 495 discharge outlet. Exemplarily, the evaporator 420 also has a waste liquid inlet and a waste liquid outlet, and the waste liquid inlet and the waste liquid outlet are connected to the separator 410, enabling the liquid in the separator 410 to be discharged into the evaporator 420 and enabling the liquid in the evaporator 420 to be discharged into the separator 410.

[0034] The waste liquid circulates between the evaporator 420 and the separator 410 to form a main circulation path. As Figure 1 shown, a circulation pump 450 is provided on the main circulation path, and the circulation pump 450 can drive the wastewater to flow in the main circulation path.

[0035] Exemplarily, as Figure 1 shown, the arrows in the figure indicate the flow direction of the wastewater or steam. The flow process of the wastewater in the main circulation path is as follows: The wastewater is first injected into the separator 410. The separator 410 separates the wastewater from the steam formed by the wastewater. Then, the circulation pump 450 pumps the wastewater into the evaporator 420. The evaporator 420 heats the wastewater. Under the action of the circulation pump 450, the wastewater returns to the separator 410 again. The separator 410 separates the wastewater from the water vapor generated after heating the wastewater. Then, under the action of the circulation pump 450, the remaining wastewater is continuously pumped into the evaporator 420 for heating. This process is repeated to achieve the circulating flow of the main circulation path of the wastewater. During the circulation process, the water in the wastewater gradually evaporates and decreases, and the concentration of the wastewater gradually increases.

[0036] The centrifuge 430 is arranged on a branch of the main circulation path to form a circulation branch path. Under the action of the circulation pump 450, the waste liquid in the separator 410 is simultaneously transported to the evaporator 420 and the centrifuge 430. The centrifuge 430 separates the solid particles in the wastewater through centrifugal action, and then the centrifuge 430 discharges the treated wastewater and the deposited solid particles respectively to reduce the content of solid particles in the wastewater and reduce scaling. In the prior art, during the continuous concentration of wastewater, the concentration of calcium sulfate particles or other suspended solid particles becomes higher and higher, and the scaling tendency becomes greater and greater. The high-speed flow can no longer prevent the formation of scale, which is bound to cause scaling and even shutdown in severe cases. In the embodiment of the present application, through the centrifuge 430, the substances causing scaling in part of the wastewater are separated and discharged by centrifugal force, reducing scaling, reducing the shutdown frequency, and improving production efficiency.

[0037] N wastewater treatment devices are provided. The N wastewater treatment devices are, from upstream to downstream, the first wastewater treatment device 100, the second wastewater treatment device 200,..., the Nth wastewater treatment device respectively, where N≥2. The separator 410 of the first wastewater treatment device 100 is connected to the wastewater source 480. Exemplarily, the wastewater source 480 can provide wastewater for the wastewater treatment device. The wastewater source 480 can be a water tank, a housing, a pipeline, etc. storing wastewater. In the present application, the setting form of the wastewater source 480 is not limited as long as it can provide wastewater for the wastewater treatment device. Exemplarily, the steam for heating the wastewater in the evaporator 420 of the first wastewater treatment device 100 is provided by the steam source 490. The steam source 490 is the source for providing steam. The steam source 490 can be a boiler or other facilities for heating water vapor to provide steam for the evaporator 420.

[0038] The separator 410 of the wastewater treatment device upstream passes the steam into the evaporator 420 of the adjacent downstream wastewater treatment device, and the separator 410 of the upstream wastewater treatment device is connected to the separator 410 of the adjacent downstream wastewater treatment device to transport the wastewater from upstream to downstream.

[0039] Exemplarily, N = 2, then 2 wastewater treatment devices are provided. The 2 wastewater treatment devices are, from upstream to downstream, the first wastewater treatment device 100 and the second wastewater treatment device 200 respectively.

[0040] Such as Figure 1As shown, in some other embodiments, N = 3, and three wastewater treatment devices are provided. The three wastewater treatment devices are, from upstream to downstream, the first wastewater treatment device 100, the second wastewater treatment device 200, and the third wastewater treatment device 300. The first wastewater treatment device 100 treats the wastewater and then discharges it into the second wastewater treatment device 200 for a second treatment. The second wastewater treatment device 200 treats the wastewater and then discharges it into the third wastewater treatment device 300. The third wastewater treatment device 300 conducts a third treatment on the wastewater. After the wastewater is treated N times, the proportion of calcium ions and sulfate ions decreases, and calcium sulfate particles, other suspended solids, and chloride ions are continuously concentrated. Chloride ions have an effect of increasing the solubility of calcium sulfate. When the chloride ions exceed a certain concentration, they promote the formation of calcium sulfate precipitation. Coupled with the common ion effect of other salts, these factors make it impossible for us to accurately predict the concentration of calcium sulfate particles and saturated calcium sulfate molecules. Therefore, a centrifuge 430 needs to be provided to centrifugally separate the calcium sulfate particles and other suspended substances to prevent equipment scaling and blockage.

[0041] Of course, N can also be equal to 4, 5, 6, etc.

[0042] To facilitate the understanding and description of the technical solutions of the desulfurized wastewater treatment device provided in the embodiments of the present application, the following embodiments will describe the technical solutions based on N = 3.

[0043] In one embodiment, the water flow direction at the water inlet of the centrifuge 430 is parallel to the tangential direction of the inner wall of the centrifuge 430.

[0044] In the centrifuge 430, due to the centrifugal rotation of the wastewater flow, the calcium sulfate particles and other suspended particles in the wastewater can flow downward along the inner side wall of the centrifuge 430, forming fixed particles that precipitate in the centrifuge 430, and then are discharged through the centrifuge 430, thereby reducing scaling and blockage. It should be understood that the solid particles in the centrifuge 430 are discharged together with a part of the wastewater.

[0045] In one embodiment, a concentrated liquid outlet is provided at the bottom of the centrifuge 430, and the concentrated liquid in the centrifuge 430 is discharged through the concentrated liquid outlet.

[0046] As Figure 1 shown, the desulfurized wastewater treatment device further includes a concentrated liquid tank 500. The concentrated liquid tank 500 is connected to the concentrated liquid outlets of the centrifuges 430 of each wastewater treatment device to collect the wastewater containing solid particles for subsequent treatment.

[0047] In one embodiment, the centrifuge 430 is a hydrocyclone, as Figure 1As shown, the hydrocyclone includes a cylindrical chamber and a conical chamber. The cylindrical chamber and the conical chamber are interconnected and arranged in sequence along the direction of gravity. The water inlet is provided on the cylindrical chamber, and the drainage direction of the water inlet is perpendicular to the radial direction of the cylindrical chamber.

[0048] The thick liquid outlet is provided at the bottom of the conical chamber, facilitating the discharge of solid particles into the thick liquid tank 500.

[0049] Exemplarily, a waste liquid outlet is also provided at the top of the hydrocyclone, that is, the waste liquid outlet is provided at the top of the cylindrical chamber. After the solid particles in the hydrocyclone are discharged into the thick liquid tank 500, the remaining waste liquid in the hydrocyclone is discharged into the separator 410 through the waste liquid outlet to participate in the recycling process again.

[0050] As Figure 1 shown, in one embodiment, the desulfurized wastewater treatment device further includes a condenser 470. The separator 410 of the Nth wastewater treatment device is connected to the condenser 470 to condense the steam in the separator 410 of the Nth wastewater treatment device into water.

[0051] As Figure 1 shown, in one embodiment, the desulfurized wastewater treatment device further includes a regulating valve 440. The regulating valve 440 is provided on the circulation branch, and the regulating valve 440 is located between the centrifuge 430 and the circulation main path to regulate the amount of wastewater discharged from the circulation main path into the circulation branch. The regulating valve 440 makes the wastewater flow rate in the circulation branch less than the wastewater flow rate in the circulation main path, and the resistance of the circulation branch is less than the resistance of the circulation main path, so that the circulation branch can support the fluid flow in the circulation branch without adding a circulation pump 450.

[0052] Exemplarily, the regulating valve 440 includes but is not limited to one of the following: throttle valve, speed control valve, etc.

[0053] As Figure 1As shown, in one embodiment, the desulfurized wastewater treatment device further includes a preheater 460, which is arranged between the wastewater source 480 and the separator 410 of the first wastewater treatment device 100, and is used to preheat the wastewater entering the separator 410 of the first wastewater treatment device 100. The evaporators 420 of the second wastewater treatment device 200, ……, the Nth wastewater treatment device are connected to the preheater 460 to provide a heat source for heating the wastewater in the preheater 460. Exemplarily, the evaporators 420 of the second wastewater treatment device 200, the evaporators 420 of the third wastewater treatment device 300, ……, the evaporators 420 of the Nth wastewater treatment device discharge the condensed water 495 from the preheater 460, and use the residual heat of the condensed water 495 to provide a heat source for the preheater 460. The condensed water 495 exchanges heat with the wastewater in the preheater 460, so that the temperature of the wastewater in the preheater 460 rises, thereby reducing the steam consumption of the evaporator 420 of the first wastewater treatment device 100 and achieving an energy-saving effect.

[0054] During use, after the wastewater is concentrated multiple times in the desulfurized wastewater treatment device or when the vacuum degree of the separator 410 of the second wastewater treatment device 200 decreases, the heat exchange efficiency of the evaporator 420 of the second wastewater treatment device 200 decreases, and the secondary steam generated by the separator 410 of the first wastewater treatment device 100 cannot be completely condensed in the evaporator 420 of the second wastewater treatment device 200. Similarly, when the vacuum degree of the third wastewater treatment device 300 decreases, the secondary steam generated by the separator 410 of the second wastewater treatment device 200 cannot be completely condensed into water in the evaporator 420 of the third wastewater treatment device 300. The desulfurized wastewater treatment device provided by the embodiment of the present application, through the arranged preheater 460, uses the residual heat of the condensed water 495 generated by the steam of the evaporators 420 of the second wastewater treatment device 200, ……, the Nth wastewater treatment device to heat the wastewater input from the wastewater source 480 to the separator 410 of the first wastewater treatment device 100. After the condensed water 495 exchanges heat with the wastewater, the temperature of the condensed water 495 decreases, thereby ensuring that the temperature of the condensed water 495 here is lower than the boiling point under the corresponding vacuum degree, which helps to improve the vacuum degree of the desulfurized wastewater treatment device and increase the evaporation amount of the separators 410 of each wastewater treatment device.

[0055] Exemplarily, a condensed water tank is arranged at the condensed water discharge port of the preheater 460, and the condensed water tank is used to store the condensed water 495 discharged from the preheater 460 after heat exchange and temperature reduction.

[0056] In a second aspect, the embodiment of the present application further provides a desulfurized wastewater treatment process, which is implemented by using the desulfurized wastewater treatment device of any of the above embodiments. The steps of the process include:

[0057] Perform multi-stage evaporation and concentration on the wastewater; Exemplarily, the N-stage evaporation and concentration of the wastewater is achieved through the first wastewater treatment device 100, the second wastewater treatment device 200,..., the Nth wastewater treatment device provided by the desulfurization wastewater treatment device. Exemplarily, N = 2; In some other embodiments, N = 3; In some other embodiments, N = 4. Exemplarily, the treatment of the first-stage evaporation and concentration corresponds to the first wastewater treatment device 100, the treatment of the second-stage evaporation and concentration corresponds to the second wastewater treatment device 200, and so on. The treatment of the Nth wastewater treatment device corresponds to the Nth wastewater treatment device.

[0058] In each stage of evaporation and concentration, a main circulation path is set up to perform concentration treatment on the circulated wastewater by heating and vapor-liquid separation; Exemplarily, it is achieved through the main circulation path formed by the separator 410, the evaporator 420, the circulation pump 450, etc. provided by the desulfurization wastewater treatment device.

[0059] A circulation branch is set on the main circulation path to perform centrifugal separation on the solid particles in the wastewater in the main circulation path; Exemplarily, it is achieved through the centrifuge 430 and the regulating valve 440 provided by the desulfurization wastewater treatment device.

[0060] The wastewater is preheated before entering the first-stage evaporation and concentration treatment; Exemplarily, it is achieved through the preheater 460 provided by the desulfurization wastewater treatment device.

[0061] Use the steam generated by the previous-stage evaporation and concentration treatment of the wastewater to provide heat source for heating the wastewater in the main circulation path of the next-stage evaporation and concentration. Exemplarily, it is achieved through the separator 410 and the evaporator 420 provided by the desulfurization wastewater treatment device.

[0062] Before the wastewater undergoes the first-stage evaporation and concentration, the wastewater is first heated; Exemplarily, the steam for heating the wastewater in the evaporation and concentration treatment of other stages except the first stage forms condensate water 495 after condensation, and the remaining temperature of this condensate water 495 provides heat source for the preheating before the wastewater enters the first-stage evaporation and concentration.

[0063] Exemplarily, it is achieved through the preheater 460 and the evaporator 420 provided by the desulfurization wastewater treatment device.

[0064] In one embodiment, the wastewater circulation volume of the circulation branch is V1, and the wastewater circulation volume of the main circulation path is V2, where 0.005V2 ≤ V1 ≤ 0.025V2. Exemplarily, it is achieved through the regulating valve 440 provided by the desulfurization wastewater treatment device.

[0065] Exemplarily, V1 = 0.005V2. In another embodiment, V1 = 0.01V2. In another embodiment, V1 = 0.02V2. In another embodiment, V1 = 0.025V2.

[0066] In one embodiment, the wastewater circulation volume of the circulation branch is equal to the amount of wastewater introduced into the first-stage evaporation and concentration from the wastewater source 480. Exemplarily, this is achieved by the regulating valve 440 provided in the desulfurized wastewater treatment device.

[0067] In all the examples shown and described herein, any specific values should be construed as merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values.

[0068] It should be noted that like reference numerals and letters denote like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0069] The above-described embodiments merely represent several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model.

Claims

1. A desulfurized wastewater treatment device, characterized in that, Comprising: Wastewater treatment equipment for concentrating wastewater, the wastewater treatment equipment including: A separator (410) for vapor-liquid separation treatment; An evaporator (420) connected to the separator (410), the evaporator (420) for heating the waste liquid conveyed from the separator (410), and the waste liquid circulates between the evaporator (420) and the separator (410) to form a main circulation path; A centrifuge (430) provided on a branch of the main circulation path to form a circulation branch, and the waste liquid in the separator (410) is simultaneously conveyed to the evaporator (420) and the centrifuge (430); There are N wastewater treatment devices, and the N wastewater treatment devices are respectively the first wastewater treatment device (100), the second wastewater treatment device (200),..., the Nth wastewater treatment device from upstream to downstream, where N≥2, and the separator (410) of the first wastewater treatment device (100) is connected to a wastewater source (480); The steam generated by the separator (410) of the upstream wastewater treatment device is introduced into the evaporator (420) of the adjacent downstream wastewater treatment device, and the separator (410) of the upstream wastewater treatment device is connected to the separator (410) of the adjacent downstream wastewater treatment device to convey wastewater from upstream to downstream.

2. The desulfurized wastewater treatment device according to claim 1, wherein, The water outlet direction of the water inlet of the centrifuge (430) is tangential to the inlet.

3. The desulfurized wastewater treatment device according to claim 2, characterized in that, A concentrated liquid outlet is provided at the bottom of the centrifuge (430); The desulfurized wastewater treatment device further includes: A concentrated liquid tank (500) connected to the concentrated liquid outlets of the centrifuges (430) of each wastewater treatment device to collect wastewater containing solid particles.

4. The desulfurized wastewater treatment device according to claim 3, wherein, The centrifuge (430) is a hydrocyclone, and the hydrocyclone includes a cylindrical chamber and a conical chamber. The cylindrical chamber and the conical chamber are connected and are arranged in sequence along the gravity direction. The water inlet is provided in the cylindrical chamber, and the concentrated liquid outlet is provided at the bottom of the conical chamber.

5. The desulfurized wastewater treatment device according to claim 1, characterized in that, Further including: A condenser (470) connected to the separator (410) of the Nth wastewater treatment device to condense the steam in the separator (410) of the Nth wastewater treatment device into water.

6. The desulfurized wastewater treatment device according to claim 1, wherein, Further including: A regulating valve (440) provided on the circulation branch, and the regulating valve (440) is located between the centrifuge (430) and the main circulation path to regulate the amount of wastewater discharged from the main circulation path into the circulation branch.

7. The desulfurized wastewater treatment device according to claim 1, wherein, Further including: Pre - heater (460), the pre - heater (460) is arranged between the wastewater source (480) and the separator (410) of the first wastewater treatment device (100) for pre - heating the wastewater entering the separator (410) of the first wastewater treatment device (100); the evaporators (420) of the second wastewater treatment device (200), ……, the Nth wastewater treatment device are connected to the pre - heater (460) to provide a heat source for heating the wastewater for the pre - heater (460).

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