Single-fluid circulation flash evaporation zero-emission treatment device based on desulfurization wastewater concentrated solution

Abstract

The invention discloses a single-fluid circulation flash evaporation zero-emission treatment device based on a desulfurization wastewater concentrated solution, and aims to solve the problems that the pressure regulation precision of a pressure reducing valve in the flash evaporation process is limited, and the constant control of the system pressure cannot be completed under the condition that the flow fluctuation is relatively large. The diaphragm valve comprises the valve body, the control panel, the pressure reducing assembly, the pressure adjusting assembly and the corrosion eliminating assembly, on one hand, the pressure reducing assembly is matched with the pressure adjusting assembly to complete adjustment of a fluid passing mode, and the phenomenon that a diaphragm is damaged and even cracked due to cavitation caused by the fact that high-temperature and high-pressure fluid is in a large flow fluctuation stage is reduced; on the other hand, a flash evaporation intelligent control model is established in the flash evaporation process of the fluid, numerical calculation is conducted on fluid pressure difference data and overlapping projection data in the flash evaporation process of the desulfurization waste water to obtain a pressure stack coefficient, control signal output is achieved through the pressure stack coefficient, and finally adjustment of the fluid pressure data and the fluid passing area is completed. The purposes of flow constant control and stable flash evaporation are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of desulfurization wastewater treatment, and in particular to a single-fluid circulation flash evaporation zero-emission treatment device based on desulfurization wastewater concentrate. Background Art

[0002] Desulfurization wastewater concentrate refers to the concentrated liquid obtained after treatment of wastewater generated in the wet desulfurization process. The pressure reducing valve is a key device for vaporizing the fluid. When high-pressure fluid passes through the pressure reducing valve, the local resistance of the valve causes the flow rate to suddenly increase and the static pressure to drop sharply. When the pressure of the fluid is lower than the saturated vapor pressure of the fluid, part of the fluid will vaporize into gas, forming bubbles. This phenomenon is called flash evaporation. During the flash evaporation process, the fluid temperature is higher than the boiling point at the pressure, causing part of the sensible heat to be released and absorbed in the form of latent heat, thereby causing the fluid to vaporize rapidly.

[0003] It should be noted that the main function of the pressure reducing valve is to reduce the high-pressure fluid to a pressure suitable for the flash evaporation process to ensure the safe and stable operation of the system. During the flash zero-emission treatment process, the fluid pressure suddenly drops and part of the liquid evaporates rapidly. The pressure reducing valve plays a key role in pressure regulation in this process. However, during the process of reducing the pressure of steam through the pressure reducing valve, the internal diaphragm of the pressure reducing valve will be damaged by cavitation or even cracked based on the passage of high-temperature and high-pressure fluid, especially in the stage of large flow fluctuations, thereby affecting the overall flash evaporation effect.

[0004] For this purpose, this application proposes a solution. Summary of the Invention

[0005] The purpose of the present invention is to provide a single-fluid circulating flash evaporation zero-emission treatment device based on desulfurization wastewater concentrate, which is used to solve the technical problems that the pressure regulation accuracy of the pressure reducing valve is limited during the flash evaporation process and the system pressure cannot be controlled constantly when the flow fluctuation is large.

[0006] The object of the present invention can be achieved through the following technical solution: a single-fluid circulating flash evaporation zero-emission treatment device based on desulfurization wastewater concentrate, comprising a valve body and an embedded control panel, a valve cover installed on the valve body, a pressure reducing assembly installed between the valve body and the valve cover, the pressure reducing assembly comprising a diaphragm pressing piece and a valve seat, the diaphragm pressing piece being clamped between the valve body and the valve cover, and a pressure regulating assembly for controlling the fluid pressure difference being provided in the valve seat;

[0007] The pressure regulating assembly includes a valve core body sleeved in a valve seat, wherein a liquid inlet pipe and a liquid outlet pipe are respectively inserted at the radial ends of the valve core body corresponding to the valve seat, and the outer end of the liquid outlet pipe is connected to an erosion assembly;

[0008] The erosion component includes a throttle disk, in which a rear throttle plate and a front throttle plate are vertically rotatably installed, and the rear throttle plate and the front throttle plate are both provided with evenly distributed gap holes. The rear throttle plate and the front throttle plate adjust the fluid passing area through the gap holes, and a drain pipe for fluid discharge is installed at the end of the throttle disk away from the liquid outlet pipe.

[0009] It is further configured as follows: straight holes and variable diameter holes are symmetrically opened on both sides of the bottom of the valve seat, motor 2 is installed at the lower end of the valve body corresponding to the valve seat, and a sealing shaft is installed at the output end of the motor 2. The sealing shaft is plugged into the bottom opening of the valve seat, and the sealing shaft rotates to control the exchange of positions of the straight hole and the variable diameter hole.

[0010] It is further configured as follows: a collecting seat is installed on the inner side of the opening at the upper end of the valve seat, a collecting cavity is provided on the inner side of the upper end of the collecting seat, a conical step groove connected to the collecting cavity is provided near the middle of the valve core body of the collecting seat, and a collecting platform connected to the conical step groove is provided on the upper side of the middle of the valve core body.

[0011] It is further configured as follows: a dynamic pressure pin seat facing upward is installed in the middle of the diaphragm pressing plate, a spring is installed at the upper end of the dynamic pressure pin seat, and the lower end of the dynamic pressure pin seat does not contact the collecting seat.

[0012] It is further configured as follows: an adjustment mechanism is provided on the top of the valve cover, the adjustment mechanism includes a runner and a stud, the runner is rotatably installed on the top of the valve cover, and the bottom end of the stud is rotatably installed with a fixing seat connected to a spring.

[0013] It is further configured as follows: a fixed plate is installed at the upper end of the outer side of the corresponding drain pipe of the throttle disc, a motor 1 is installed at the outer end of the lower side of the fixed plate, a rotating rod passing through the drain pipe is installed at the output end of the motor 1, and the other end of the rotating rod is connected to the rear throttle plate.

[0014] It is further configured as follows: a liquid inlet channel and a liquid outlet channel are respectively connected to the liquid inlet pipe and the liquid outlet pipe in the valve body, a decompression chamber is jointly formed between the valve seat and the collecting seat, and the discharge end of the decompression chamber is connected to the liquid outlet channel through a straight hole or a variable diameter hole.

[0015] It is further configured as follows: a flash evaporation intelligent control model for analyzing and regulating the fluid flash evaporation process is established through the control panel, wherein the flash evaporation intelligent control model is provided with a bilateral pressure difference monitoring terminal, a data collection and analysis terminal, and an action interaction terminal;

[0016] The bilateral pressure difference monitoring end is used to obtain the fluid pressure difference data on both sides of the throttle disk and the overlapping projection data of the gap holes, and send the fluid pressure difference data and the overlapping projection data to the data collection and analysis end; the data collection and analysis end receives the fluid pressure difference data and the overlapping projection data and performs numerical calculation to obtain the overlap coefficient; the data collection and analysis end compares and analyzes the overlap coefficient with the overlap coefficient through the overlap coefficient threshold preset in the model, and generates a gradual weight action signal and a gradual overlap action signal and sends them to the action interaction end; the action interaction end receives the gradual weight action signal and the gradual overlap action signal and controls the relevant components to move.

[0017] The present invention has the following beneficial effects:

[0018] 1. The present invention addresses the problem that the pressure regulation accuracy of the pressure reducing valve during the flash evaporation process is limited, and that constant system pressure control cannot be achieved under conditions of large flow fluctuations. On the one hand, the pressure reducing component cooperates with the pressure regulating component to adjust the fluid passage mode, thereby reducing the phenomenon of diaphragm cavitation damage or even cracking caused by high-temperature and high-pressure fluids in the stage of large flow fluctuations. On the other hand, a flash evaporation intelligent control model is established during the fluid flash evaporation process. The flash evaporation intelligent control model numerically calculates the fluid pressure difference data and overlapping projection data during the flash evaporation of desulfurization wastewater to obtain the overlap coefficient, and outputs a control signal based on the overlap coefficient, ultimately completing the adjustment of the fluid pressure data and the fluid passage area, thereby achieving constant flow control and stable flash evaporation.

[0019] 2. In the stage of avoiding diaphragm cavitation, first, a stable vortex is formed by the conical step groove, and then the vortex impacts the gathering table from top to bottom to complete stable fluid bearing, thereby reducing the probability of the pressure balance being affected by the turbulent impact of the fluid in the valve body; then the flow direction of the fluid in the pressure reducing assembly is the setting of the liquid inlet pipe, liquid inlet channel, pressure reducing chamber, straight hole or variable diameter hole, liquid outlet channel, and liquid outlet pipe, and the fluid is rapidly decompressed therein, and when the pressure in the liquid inlet pipe is constantly changing, the pressure of the fluid discharged from the liquid outlet pipe is kept within a limited range. On this basis, by actively changing the connection position of the straight hole and the variable diameter hole on the valve seat, the problem of large fluctuation of the fluid flow is reduced, and the fluid passing through the diaphragm pressing plate can further reduce the cavitation phenomenon of it, thereby avoiding cavitation and cracking; especially important is: the staggered overlapping of the gap holes on the rear throttle plate and the front throttle plate is adopted to change the fluid passage area, so as to realize stable flash evaporation with constant flow control. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the structure proposed by the present invention;

[0022] Figure 2 This is a schematic cross-sectional view of the front view of the structure of the present invention;

[0023] Figure 3 A schematic cross-sectional view of a portion of the structure proposed by the present invention;

[0024] Figure 4 This is a schematic cross-sectional view of a portion of the structure of the pressure regulating assembly of the pressure reducing assembly proposed by the present invention;

[0025] Figure 5 This is a schematic diagram of the cross-sectional structure of the erosion component proposed in the present invention;

[0026] Figure 6 This is a schematic diagram of the internal structure of the bottom of the valve body proposed by the present invention.

[0027] In the figure: 1. Valve body; 2. Valve cover; 3. Adjustment mechanism; 4. Connecting plate; 5. Liquid inlet pipe; 6. Liquid outlet pipe; 7. Throttle disc; 8. Liquid drain pipe; 9. Motor 1; 10. Liquid inlet channel; 11. Dynamic pressure pin seat; 12. Diaphragm pressure plate; 13. Valve core body; 14. Valve seat; 15. Collecting chamber; 16. Pressure reducing chamber; 17. Liquid outlet channel; 18. Rear throttle plate; 19. Front throttle plate; 20. Rotating rod; 21. Fixed plate; 22. Clearance hole; 23. Fixed seat; 24. Spring; 25. Collecting seat; 26. Conical step groove; 27. Collecting table; 28. Straight hole; 29. ​​Variable diameter hole; 30. Motor 2; 31. Blocking shaft hole. DETAILED DESCRIPTION

[0028] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Example 1: To address the problem that the pressure regulation accuracy of the pressure reducing valve during the flash evaporation process is limited and the system pressure cannot be controlled constantly when the flow rate fluctuates greatly, the following technical solution is proposed:

[0030] Reference Figure 1 - Figure 6 As shown, in this embodiment, a single-fluid circulating flash evaporation zero-emission treatment device based on desulfurization wastewater concentrate includes a valve body 1 and an embedded control panel. A valve cover 2 is installed on the valve body 1. A pressure reducing assembly is installed between the valve body 1 and the valve cover 2. The pressure reducing assembly includes a diaphragm pressing piece 12 and a valve seat 14. The diaphragm pressing piece 12 is clamped between the valve body 1 and the valve cover 2. A pressure regulating assembly for controlling the fluid pressure difference is provided in the valve seat 14.

[0031] The pressure regulating assembly includes a valve core body 13 sleeved in a valve seat 14. A liquid inlet pipe 5 and a liquid outlet pipe 6 are inserted into the radial ends of the valve core body 13 corresponding to the valve seat 14. When the fluid enters through the liquid inlet pipe 5 and exits through the liquid outlet pipe 6, pressure changes occur, and the pressure change is controlled by the diaphragm pressure piece 12.

[0032] Reference Figure 3 As shown, the top of the valve cover 2 is provided with an adjustment mechanism 3, which includes a runner and a stud. The runner is rotatably mounted on the top of the valve cover 2, and the bottom end of the stud is rotatably mounted with a fixing seat 23 connected to a spring 24. The basis for adjusting the pressure change of the fluid passing through the diaphragm pressing plate 12 is pre-set by the adjustment mechanism 3. The initial fluid passing sudden drop level is determined to determine its adjustment limit, and manual or electric adjustment is made accordingly (for electric adjustment, the runner is controlled by the motor to rotate);

[0033] Reference Figure 3 、 Figure 5 As shown, the outer end of the liquid outlet pipe 6 is connected to an erosion assembly, which includes a throttle disc 7. A rear throttle plate 18 and a front throttle plate 19 are vertically rotatably mounted in the throttle disc 7. The rear throttle plate 18 and the front throttle plate 19 are both provided with evenly distributed gap holes 22. The rear throttle plate 18 and the front throttle plate 19 adjust the fluid passage area through the gap holes 22. A drain pipe 8 for fluid discharge is installed at the end of the throttle disc 7 away from the liquid outlet pipe 6.

[0034] Reference Figure 4 and Figure 6As shown, straight holes 28 and variable diameter holes 29 are symmetrically opened on both sides of the bottom of the valve seat 14. A motor 2 30 is installed at the lower end of the valve body 1 corresponding to the valve seat 14. A blocking shaft 31 is installed at the output end of the motor 2 30. The blocking shaft 31 is plugged into the bottom opening of the valve seat 14, and the blocking shaft 31 rotates to control the straight hole 28 and the variable diameter hole 29 to exchange positions. A collecting seat 25 is installed on the inner side of the opening at the upper end of the valve seat 14. A collecting cavity 15 is opened on the inner side of the upper end of the collecting seat 25. The collecting seat 25 is close to the valve core. A tapered step groove 26 communicating with the collecting chamber 15 is provided in the middle of the valve body 13, and a gathering platform 27 is provided on the upper side of the middle portion of the valve core body 13, which is in contact with the tapered step groove 26. The gathering platform 27 and the tapered step groove 26 are provided to reduce the impact of turbulent flow caused by the fluid in the valve body. First, the tapered step groove 26 forms a stable vortex, which then impacts the gathering platform 27 from top to bottom to achieve stable fluid bearing, thereby reducing the probability of pressure balance being affected by the turbulent flow impact of the fluid in the valve body.

[0035] Reference Figure 2 As shown, the valve body 1 is provided with a liquid inlet channel 10 and a liquid outlet channel 17 respectively connected to the liquid inlet pipe 5 and the liquid outlet pipe 6, and the valve seat 14 and the collecting seat 25 jointly form a decompression chamber 16, and the discharge end of the decompression chamber 16 is connected to the liquid outlet channel 17 through a straight hole 28 or a reducing hole 29, wherein the flow direction of the fluid in the decompression assembly is the liquid inlet pipe 5, the liquid inlet channel 10, the decompression chamber 16, the straight hole 28 or the reducing hole 29, the liquid outlet channel 17, and the liquid outlet pipe 6. The fluid is rapidly decompressed therein, and when the pressure in the liquid inlet pipe 5 changes continuously, the pressure of the fluid discharged from the liquid outlet pipe 6 is kept within a limited range. On this basis, by actively changing the connection position of the straight hole 28 and the reducing hole 29 on the valve seat 14, the problem of large fluctuations in fluid flow is reduced, and the fluid passing through the diaphragm pressing piece can reduce the cavitation phenomenon thereof, thereby avoiding cavitation and cracking.

[0036] Reference Figure 3 As shown, a dynamic pressure pin seat 11 facing upward is installed in the middle of the diaphragm pressing piece 12, a spring 24 is installed at the upper end of the dynamic pressure pin seat 11, and the lower end of the dynamic pressure pin seat 11 does not contact the collecting seat 25.

[0037] Structural Principle: This device is used in the treatment process of desulfurization wastewater concentrate, and is specifically used in flash evaporation treatment. For the rapid decompression of desulfurization wastewater, it controls the pressure drop level of the fluid passing through by a pre-set constant pressure standard. Combined with the variable fluid passage mode, it reduces the phenomenon of diaphragm cavitation damage or even cracking caused by high-temperature and high-pressure fluid in the stage of large flow fluctuation;

[0038] Example 2: This example further optimizes the erosion component in Example 1.

[0039] Reference Figure 3 and Figure 5 As shown, a fixing plate 21 is installed on the upper end of the outer side of the discharge pipe 8 corresponding to the throttle disc 7, and a motor 9 is installed on the outer end of the lower side of the fixing plate 21. A rotating rod 20 that passes through the discharge pipe 8 is installed on the output end of the motor 9, and the other end of the rotating rod 20 is connected to the rear throttle plate 18;

[0040] A flash evaporation intelligent control model for analyzing and controlling the fluid flash evaporation process is established through the control panel. The flash evaporation intelligent control model is provided with a double-side pressure difference monitoring terminal, a data collection and analysis terminal, and an action interaction terminal. The double-side pressure difference monitoring terminal is used to obtain the fluid pressure difference data on both sides of the throttle disk 7 and the overlapping projection data of the gap hole 22.

[0041] The fluid pressure difference data on both sides of the throttle disc 7 is measured and obtained by pressure sensors respectively arranged on the liquid inlet pipe 5 and the liquid discharge pipe 8, which is used to reflect the fluid pressure difference data on the liquid inlet pipe 5 and the liquid discharge pipe 8 and is marked as P 差 , and the overlapping projection data on the aperture 22 is measured by the angle sensors embedded in the rear throttle plate 18 and the front throttle plate 19 to reflect the overlapping area data of the aperture 22 on the rear throttle plate 18 and the front throttle plate 19, and is marked as S 重 , and send the fluid pressure difference data and overlapping projection data to the data collection and analysis end;

[0042] The data collection and analysis end receives the fluid pressure difference data and the overlapping projection data and performs numerical calculations to obtain the overlap coefficient YD: Construct the calculation formula of the overlap coefficient YD a and b are both preset weight ratio coefficients, and a>b>0 and a+b=5.7. 差 The impact of the stacking coefficient YD is greater than that of S 重 More importantly, the values ​​of a and b corresponding to the two are 3.5 and 2.2 respectively, which is the weight assigned to the calculation process of the stacking coefficient YD;

[0043] The data collection and analysis end compares and analyzes the overlap coefficient with the overlap coefficient threshold preset in the model, and generates a gradual weight action signal and a gradual overlap action signal, which are sent to the action interaction end. The action interaction end receives the gradual weight action signal and the gradual overlap action signal and controls the relevant components to move.

[0044] The comparison and analysis process is as follows: when the overlap coefficient is greater than the overlap coefficient threshold, it indicates that the current fluid flow rate fluctuates greatly, and a gradual overlap action signal is generated synchronously. The gradual overlap action signal is sent to the action interaction terminal, which converts the gradual overlap action signal into a control signal and sends it to motor 1 9. Motor 1 9 drives the rear throttle plate 18 to rotate via the rotating rod 20. At this time, the gaps 22 on the rear throttle plate 18 and the front throttle plate 19 gradually overlap until the overlap coefficient is within the overlap coefficient threshold;

[0045] When the overlap coefficient is within the overlap coefficient threshold, no signal is generated;

[0046] When the overlap coefficient is less than the overlap coefficient threshold, it indicates that the current fluid flow fluctuation is small, and a gradually heavy action signal is generated synchronously. The gradually heavy action signal is sent to the action interaction terminal, which converts the gradually heavy action signal into a control signal and sends it to motor 1 9. Motor 1 9 drives the rear throttle plate 18 to rotate through the rotating rod 20. At this time, the gaps 22 on the rear throttle plate 18 and the front throttle plate 19 gradually overlap until the overlap coefficient is within the overlap coefficient threshold.

[0047] Basic principle: Based on Example 1, a flash evaporation intelligent control model is established in the fluid flash evaporation process. The fluid pressure difference data and overlapping projection data in the desulfurization wastewater flash evaporation process are numerically calculated through the flash evaporation intelligent control model to obtain the overlap coefficient, and the control signal output is realized by the overlap coefficient. Finally, the adjustment of the fluid pressure data and the fluid passing area is completed to achieve the purpose of constant flow control and stable flash evaporation.

[0048] In summary, combining the first and second embodiments, the process and principle of the present invention are as follows:

[0049] Step 1: The fluid flows through the pressure reducing assembly through the liquid inlet pipe 5, the liquid inlet channel 10, the pressure reducing chamber 16, the straight hole 28 or the variable diameter hole 29, the liquid outlet channel 17, and the liquid outlet pipe 6. The fluid is rapidly decompressed within this flow, and while the pressure in the liquid inlet pipe 5 is constantly changing, the pressure of the fluid discharged from the liquid outlet pipe 6 is maintained within a specified range.

[0050] Step 2: By actively changing the communication position of the straight hole 28 and the variable diameter hole 29 on the valve seat 14, the problem of large fluctuations in fluid flow is reduced. Furthermore, the fluid passing through the diaphragm pressing plate can reduce cavitation on it, thereby avoiding cavitation and cracking.

[0051] Step 3: Apply the flash evaporation intelligent control model to obtain fluid pressure difference data and overlapping projection data, and calculate the overlap coefficient. After making the numerical calculation, compare and analyze it with the overlap coefficient threshold, and output a control signal so that the gap holes 22 on the rear throttle plate 18 and the front throttle plate 19 can automatically change the staggered position, ultimately achieving the adjustment of the fluid pressure data and the fluid passage area to realize stable flash evaporation.

[0052] The advantages are: on the one hand, the pressure reducing component cooperates with the pressure regulating component to adjust the fluid flow mode, thereby reducing the phenomenon of diaphragm cavitation damage or even cracking caused by high-temperature and high-pressure fluid in the stage of large flow fluctuation;

[0053] On the other hand, a flash evaporation intelligent control model is established in the fluid flash evaporation process. The fluid pressure difference data and overlapping projection data in the flash evaporation process of desulfurization wastewater are numerically calculated through the flash evaporation intelligent control model to obtain the overlap coefficient, and the control signal output is realized by the overlap coefficient. Finally, the adjustment of the fluid pressure data and the fluid passing area is completed to achieve the purpose of constant flow control and stable flash evaporation.

[0054] The coefficients in the formula are set by those skilled in the art according to actual conditions. The above is only a preferred specific implementation of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, can make equivalent replacements or changes based on the technical solution and inventive concept of the present invention, which should be covered by the scope of protection of the present invention.

[0055] In the description of this specification, the descriptions with reference to the terms "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples. The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods.

Claims

1. A single-fluid circulating flash evaporation zero-emission treatment device based on desulfurization wastewater concentrate, comprising a valve body (1) and an embedded control panel, characterized in that: A valve cover (2) is mounted on the valve body (1), and a pressure reducing assembly is mounted between the valve body (1) and the valve cover (2), wherein the pressure reducing assembly comprises a diaphragm pressing piece (12) and a valve seat (14), wherein the diaphragm pressing piece (12) is clamped between the valve body (1) and the valve cover (2), and a pressure regulating assembly for controlling a fluid pressure difference is arranged in the valve seat (14); The pressure regulating assembly comprises a valve core body (13) sleeved in a valve seat (14), a liquid inlet pipe (5) and a liquid outlet pipe (6) are respectively inserted at two radial ends of the valve core body (13) corresponding to the valve seat (14), and the outer end of the liquid outlet pipe (6) is connected to an erosion assembly; The erosion component includes a throttle disc (7), a rear throttle plate (18) and a front throttle plate (19) are vertically rotatably installed in the throttle disc (7), and the rear throttle plate (18) and the front throttle plate (19) are both provided with evenly distributed gap holes (22), and the rear throttle plate (18) and the front throttle plate (19) adjust the fluid passing area through the gap holes (22), and a drain pipe (8) for discharging the fluid is installed at one end of the throttle disc (7) away from the liquid outlet pipe (6).

2. The single-fluid circulating flash evaporation zero-emission treatment device based on desulfurization wastewater concentrate according to claim 1 is characterized in that: The bottom of the valve seat (14) is symmetrically provided with straight holes (28) and variable diameter holes (29). The lower end of the valve body (1) corresponding to the valve seat (14) is equipped with a second motor (30). The output end of the second motor (30) is equipped with a blocking shaft (31). The blocking shaft (31) is plugged into the bottom opening of the valve seat (14), and the blocking shaft (31) rotates to control the straight hole (28) and the variable diameter hole (29) to exchange positions.

3. The single-fluid circulating flash evaporation zero-emission treatment device based on desulfurization wastewater concentrate according to claim 2 is characterized in that: A collecting seat (25) is installed on the inner side of the opening at the upper end of the valve seat (14), and a collecting cavity (15) is provided on the inner side of the upper end of the collecting seat (25). A conical step groove (26) communicating with the collecting cavity (15) is provided on the collecting seat (25) near the middle of the valve core body (13), and a collecting platform (27) connected to the conical step groove (26) is provided on the upper side of the middle of the valve core body (13).

4. The single-fluid circulation flash evaporation zero-emission treatment device based on desulfurization wastewater concentrate according to claim 3 is characterized in that: A dynamic pressure pin seat (11) facing upward is installed in the middle of the diaphragm pressing plate (12), a spring (24) is installed at the upper end of the dynamic pressure pin seat (11), and the lower end of the dynamic pressure pin seat (11) does not contact the collecting seat (25).

5. The single-fluid circulation flash evaporation zero-emission treatment device based on desulfurization wastewater concentrate according to claim 4 is characterized in that: An adjusting mechanism (3) is provided on the top of the valve cover (2), and the adjusting mechanism (3) comprises a rotating wheel and a stud. The rotating wheel is rotatably mounted on the top of the valve cover (2), and a fixing seat (23) connected to a spring (24) is rotatably mounted on the bottom end of the stud.

6. The single-fluid circulating flash evaporation zero-emission treatment device based on desulfurization wastewater concentrate according to claim 1 is characterized in that: A fixing plate (21) is installed at the upper end of the outer side of the corresponding discharge pipe (8) of the throttle disc (7), a motor (9) is installed at the outer end of the lower side of the fixing plate (21), and a rotating rod (20) penetrating the discharge pipe (8) is installed at the output end of the motor (9), and the other end of the rotating rod (20) is connected to the rear throttle plate (18).

7. The single-fluid circulation flash evaporation zero-emission treatment device based on desulfurization wastewater concentrate according to claim 3 is characterized in that: The valve body (1) is provided with a liquid inlet channel (10) and a liquid outlet channel (17) respectively connected to the liquid inlet pipe (5) and the liquid outlet pipe (6). The valve seat (14) and the collecting seat (25) together form a decompression chamber (16). The discharge end of the decompression chamber (16) is connected to the liquid outlet channel (17) via a straight hole (28) or a variable diameter hole (29).

8. The single-fluid circulation flash evaporation zero-emission treatment device based on desulfurization wastewater concentrate according to claim 1 is characterized in that: A flash evaporation intelligent control model for analyzing and regulating the fluid flash evaporation process is established through the control panel, wherein the flash evaporation intelligent control model is provided with a bilateral pressure difference monitoring terminal, a data collection and analysis terminal, and an action interaction terminal; The double-sided pressure difference monitoring end is used to obtain the fluid pressure difference data on both sides of the throttle disc (7) and the overlapping projection data of the gap hole (22), and send the fluid pressure difference data and the overlapping projection data to the data collection and analysis end; the data collection and analysis end receives the fluid pressure difference data and the overlapping projection data and performs numerical calculation to obtain the overlap coefficient; the data collection and analysis end compares and analyzes the overlap coefficient with the overlap coefficient through the overlap coefficient threshold preset in the model, and generates a gradual weight action signal and a gradual overlap action signal and sends them to the action interaction end; the action interaction end receives the gradual weight action signal and the gradual overlap action signal and controls the relevant components to move.

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