Flue gas concentration wastewater device

Abstract

The invention relates to a flue gas concentration wastewater device. The flue gas concentration wastewater device comprises a wastewater inlet pipe, a wastewater circulating pipe, a wastewater buffer tank, a wastewater outlet pipe, a flue gas evaporation device, a flue gas inlet pipe and a flue gas outlet pipe, the wastewater inlet pipe is connected with an inlet of the wastewater buffer tank; one end of the wastewater circulating pipe is connected with an outlet of the wastewater buffer tank, and the other end of the wastewater circulating pipe is connected with a water inlet inner pipe of the flue gas evaporation device; a water outlet inner pipe of the flue gas evaporation device is connected with one end of a wastewater outlet pipe, and the other end of the wastewater outlet pipe extends into the cavity of the wastewater buffer tank; a wastewater circulating pump is arranged on the wastewater circulating pipe; a water outlet hole is formed in a water inlet inner pipe of the flue gas evaporation device, and a water inlet hole is formed in a water outlet inner pipe of the flue gas evaporation device; more than two evaporation plates are arranged in the flue gas evaporation device; the more than two water outlet holes are respectively communicated with the more than two water inlet holes through the more than two evaporation plates; the flue gas is introduced into the flue gas evaporation device, and the wastewater on the evaporation plate is evaporated.

Description

Technical Field

[0001] The present application relates to the technical field of wastewater desulfurization, and in particular to a flue gas concentration wastewater device. Background Art

[0002] Thermal power plants are large water users. All water obtained from nature will be involved in the operation of the system, resulting in a large amount of desulfurization wastewater discharge. Desulfurization wastewater, as the last wastewater from coal-fired power plants, contains impurities mainly including suspended matter, supersaturated sulfites and sulfates, many of which are Class I pollutants that must be strictly controlled in national environmental protection standards. If a large amount of desulfurization wastewater is directly discharged into the natural water system, it will cause a large degree of environmental pollution. Therefore, reducing the discharge of desulfurization wastewater is an essential link.

[0003] The present application proposes a flue gas concentration wastewater device suitable for evaporating and reducing the emission of desulfurization wastewater. Summary of the invention

[0004] In view of this, the present application proposes a flue gas concentration wastewater device.

[0005] According to one aspect of the present application, a flue gas concentration wastewater device is provided, comprising: a wastewater inlet pipe, a wastewater circulation pipe, a wastewater buffer tank, a wastewater outlet pipe, a flue gas evaporation device, a flue gas inlet pipe and a flue gas outlet pipe;

[0006] The wastewater inlet pipe is connected to the inlet of the wastewater buffer tank, which is suitable for introducing wastewater into the wastewater buffer tank; one end of the wastewater circulation pipe is connected to the outlet of the wastewater buffer tank, and the other end of the wastewater circulation pipe is connected to the water inlet inner pipe of the flue gas evaporation device, which is suitable for transporting wastewater from the wastewater buffer tank to the flue gas evaporation device; the water outlet inner pipe of the flue gas evaporation device is connected to one end of the wastewater outlet pipe, and the other end of the wastewater outlet pipe is inserted into the cavity of the wastewater buffer tank, which is suitable for transporting evaporated wastewater from the flue gas evaporation device back to the wastewater buffer tank;

[0007] A wastewater circulation pump is provided on the wastewater circulation pipe;

[0008] The water inlet inner tube of the flue gas evaporation device is provided with two or more water outlet holes, and the water outlet inner tube of the flue gas evaporation device is provided with two or more water inlet holes; the flue gas evaporation device is provided with two or more evaporation plates; and the two or more water outlet holes are respectively connected with the two or more water inlet holes through the two or more evaporation plates;

[0009] An air inlet suitable for connecting to a smoke inlet pipe is provided on one side of the smoke evaporation device, and an air outlet suitable for connecting to a smoke outlet pipe is provided on the opposite side, which is suitable for introducing smoke from the smoke inlet pipe into the cavity of the smoke evaporation device and evaporating the wastewater on the evaporation plate before flowing out from the smoke outlet pipe.

[0010] In a possible implementation, a first flow sensor and a first valve are provided on the wastewater inlet pipe; the first flow sensor and the first valve are arranged in sequence along the flow direction of water in the wastewater inlet pipe.

[0011] In a possible implementation, the device further includes: a liquid level meter;

[0012] Two liquid level tubes are arranged on the side wall of the wastewater buffer tank, and the two liquid level tubes are respectively connected to two interface pipes of the liquid level meter.

[0013] In a possible implementation, the device further includes: a differential pressure gauge;

[0014] A first pressure water pipe and a second pressure water pipe are provided on the side wall of the wastewater buffer tank, and the first pressure water pipe is arranged above the second pressure water pipe, and a preset distance is provided between the first pressure water pipe and the second pressure water pipe;

[0015] The first pressure water pipe and the second pressure water pipe are both connected to the differential pressure gauge.

[0016] In a possible implementation, the wastewater buffer tank is provided with a drain pipe suitable for discharging concentrated wastewater from the wastewater buffer tank.

[0017] In a possible implementation, the wastewater circulation pipe is provided with a second valve, and the second valve and the wastewater circulation pump are arranged in sequence along the flow direction of the wastewater in the wastewater circulation pipe.

[0018] In a possible implementation, two wastewater circulation pipes are provided, one end of each of the two wastewater circulation pipes is connected to the wastewater buffer tank, and the other end of each of the two wastewater circulation pipes is connected to the water inlet inner pipe.

[0019] In a possible implementation manner, a first temperature sensor is provided on the smoke inlet pipe.

[0020] In a possible implementation, a second temperature sensor is provided on the smoke outlet pipe.

[0021] In a possible implementation, it further includes: a return pipe;

[0022] One end of the reflux pipe is connected to the wastewater circulation pipe, and the other end of the reflux pipe is inserted into the cavity of the wastewater buffer tank.

[0023] Beneficial effects: The wastewater buffer tank is suitable for storing wastewater introduced by the wastewater inlet pipe, and continuously collecting wastewater evaporated by the flue gas evaporation device; the flue gas evaporation device is suitable for evaporating and concentrating wastewater; the concentrated wastewater enters the wastewater buffer tank again, thereby cyclically evaporating and concentrating the wastewater in the wastewater buffer tank until the wastewater in the wastewater buffer tank reaches a certain density and is discharged. The present application can perform multiple reciprocating cyclic evaporation of wastewater until the density of the wastewater in the wastewater buffer tank reaches a certain height and the wastewater is discharged; thereby reducing the amount of wastewater discharged, and at the same time, the cost is low, which can reduce the investment cost of wastewater concentration.

[0024] Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the present application and, together with the description, serve to explain the principles of the present application.

[0026] Figure 1 A main structural diagram of a flue gas concentration wastewater device according to an embodiment of the present application is shown;

[0027] Figure 2 An internal view of a smoke evaporation device according to an embodiment of the present application is shown;

[0028] Figure 3 A main structural diagram of the evaporation plate of an embodiment of the present application is shown;

[0029] Figure 4 A main structural diagram of the water inlet inner pipe of an embodiment of the present application is shown;

[0030] Figure 5 The main structure diagram of the water outlet inner pipe of the embodiment of the present application is shown.

[0031] Wastewater buffer tank 100, wastewater inlet pipe 400, wastewater circulation pipe 300, wastewater outlet pipe 800, flue gas evaporation device 200, flue gas inlet pipe 600, flue gas outlet pipe 700, first temperature sensor 610, second temperature sensor 710, first flow sensor 410, first valve 420, third temperature sensor 110, differential pressure gauge 170, first pressure water pipe 150, second pressure water pipe 160, second cleaning pipe 910, third cleaning pipe 920, drain pipe 180, liquid level gauge 140, second valve 310, wastewater circulation pump 320, third flow sensor 330, third valve 340, reflux pipe 500, plate surface 210, water inlet part 211, water outlet part 215, support plate 220, water inlet inner pipe 230, water outlet inner pipe 240. DETAILED DESCRIPTION

[0032] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0033] Among them, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention or simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0036] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0037] Figure 1 The structural connection diagram of the flue gas concentration wastewater device according to one embodiment of the present application is shown. Figure 1As shown, the flue gas concentration wastewater device comprises: a wastewater inlet pipe 400, a wastewater circulation pipe 300, a wastewater buffer tank 100, a wastewater outlet pipe 800, a flue gas evaporation device 200, a flue gas inlet pipe 600 and a flue gas outlet pipe 700; the wastewater inlet pipe 400 is connected to the inlet of the wastewater buffer tank 100 and is suitable for introducing wastewater into the wastewater buffer tank 100; one end of the wastewater circulation pipe 300 is connected to the outlet of the wastewater buffer tank 100, and the other end of the wastewater circulation pipe 300 is connected to the water inlet inner pipe 230 of the flue gas evaporation device 200 and is suitable for transporting wastewater from the wastewater buffer tank 100 to the flue gas evaporation device 200; the water outlet inner pipe 240 of the flue gas evaporation device 200 is connected to one end of the wastewater outlet pipe 800, and the other end of the wastewater outlet pipe 800 is inserted into the cavity of the wastewater buffer tank 100 and is suitable for transporting evaporated wastewater from the wastewater buffer tank 100 to the flue gas evaporation device 200; The wastewater is sent back to the wastewater buffer tank 100 by the flue gas evaporation device 200; a wastewater circulation pump 320 is provided on the wastewater circulation pipe 300; more than two water outlet holes 232 are provided on the water inlet inner pipe 230 of the flue gas evaporation device 200, and more than two water inlet holes 242 are provided on the water outlet inner pipe 240 of the flue gas evaporation device 200; more than two evaporation plates are provided in the flue gas evaporation device 200; and the more than two water outlet holes 232 are connected with the more than two water inlet holes 242 through the more than two evaporation plates respectively; an air inlet suitable for connecting to the flue gas inlet pipe 600 is provided on one side of the flue gas evaporation device 200, and an air outlet suitable for connecting to the flue gas outlet pipe 700 is provided on the opposite side, which is suitable for introducing the flue gas from the flue gas inlet pipe 600 into the cavity of the flue gas evaporation device 200 and evaporating the wastewater on the evaporation plate before flowing out from the flue gas outlet pipe 700.

[0038] Here, it should be noted that the wastewater buffer tank 100 is suitable for storing new wastewater introduced by the wastewater inlet pipe 400, and continuously collecting wastewater evaporated by the flue gas evaporation device 200; the flue gas evaporation device 200 is suitable for evaporating and concentrating the wastewater; the concentrated wastewater enters the wastewater buffer tank 100 again, thereby cyclically evaporating and concentrating the wastewater in the wastewater buffer tank 100 until the wastewater reaches a certain density and is discharged. Further explanation, the wastewater inlet pipe 400 is suitable for introducing the wastewater to be evaporated and concentrated into the wastewater buffer tank 100 for storage, and the wastewater circulation pipe 300 is suitable for sending wastewater into the water inlet inner pipe 230 of the flue gas evaporation device 200. Since the water inlet inner pipe 230 of the flue gas evaporation device 200 has more than two water outlet holes 232 and the water outlet holes 232 are connected to the evaporation plate, the wastewater in the water inlet inner pipe 230 can flow to the evaporation plate through the water outlet holes 232. After that, the wastewater flows through the plate surface 210 of the evaporation plate and then flows into the water outlet inner pipe 240 from the water inlet 242 of the water outlet inner pipe 240. Since the water outlet inner pipe 240 is connected to the wastewater outlet pipe 800, the evaporated wastewater flows back into the wastewater buffer tank 100 from the wastewater outlet pipe 800. Under the action of the wastewater circulation pump 320, the wastewater in the wastewater buffer tank 100 flows into the wastewater circulation pipe 300 again and is sent to the flue gas evaporation device 200 again for repeated evaporation and concentration. Furthermore, an air inlet for connecting to the smoke inlet pipe 600 is provided on one side of the smoke evaporation device 200, which is suitable for introducing smoke into the smoke evaporation device 200 through the smoke inlet pipe 600. The smoke convects with the wastewater on the evaporation plate. In this process, the smoke takes away a small amount of water vapor from the wastewater, so that the water and salt are separated. In the continuous circulation process, the salt content in the wastewater buffer tank 100 will increase, the water content will decrease, and the density of the wastewater will increase. An air outlet for connecting to the smoke outlet pipe 700 is provided on the side opposite to the air inlet, which is suitable for leading the smoke out of the smoke outlet pipe 700. The present application can perform multiple reciprocating cycles of evaporation on the wastewater until the density of the wastewater in the wastewater buffer tank 100 reaches a certain height and the wastewater is discharged. This reduces the amount of wastewater discharged, and at the same time, the cost is low, which can reduce the investment cost of wastewater concentration.

[0039] In a possible implementation, a first flow sensor 410 and a first valve 420 are provided on the wastewater inlet pipe 400; the first flow sensor 410 and the first valve 420 are arranged in sequence along the flow direction of water in the wastewater inlet pipe 400. Here, it should be noted that the first flow sensor 410 is suitable for measuring the wastewater flow in the wastewater inlet pipe 400; and the first valve 420 is suitable for controlling the on and off of the wastewater inlet pipe 400 at any time.

[0040] In a possible implementation, a stirring device 190 is provided inside the cavity of the wastewater buffer tank 100, which is suitable for stirring the wastewater in the wastewater buffer tank 100 to prevent salt from being deposited at the bottom of the wastewater buffer tank 100 and affecting the measurement of wastewater density by the differential pressure meter 170. Further, the stirring device 190 adopts a pulse suspension stirring device, and the pulse suspension nozzles of the pulse suspension stirring device are all facing the bottom of the wastewater buffer tank 100.

[0041] In a possible implementation, it also includes: a liquid level meter 140; two liquid level tubes are provided on the side wall of the wastewater buffer tank 100, the two liquid level tubes are located at different heights of the wastewater buffer tank 100, and the two liquid level tubes are respectively connected to the interface tube 120 and the interface tube 130 of the liquid level meter, and are suitable for detecting whether the liquid level in the wastewater buffer tank 100 is maintained within a preset range through the liquid level meter 140. Here, it should be noted that when the liquid level in the wastewater buffer tank 100 reaches the highest preset liquid level (exceeding the liquid level tube located above), or when the liquid level in the wastewater buffer tank 100 drops below the lowest preset liquid level (drops below the liquid level tube below), it can be displayed externally through the liquid level meter 140, so as to facilitate the staff or the controller to control the opening and closing of the first valve 420 at any time to avoid excessive wastewater in the wastewater buffer tank 100.

[0042] Furthermore, the liquid level meter 140 adopts a magnetic flap liquid level meter, which has an interface pipe 120 and an interface pipe 130. The interface pipe 120 is connected to the liquid level pipe located above the wastewater buffer tank 100, and the interface pipe 130 is connected to the liquid level pipe located below the wastewater buffer tank 100.

[0043] Preferably, the height of the liquid level pipe located at the bottom of the wastewater buffer tank 100 accounts for 10% of the overall height of the wastewater buffer tank 100; the height of the liquid level pipe located at the top of the wastewater buffer tank 100 accounts for 90% of the overall height of the wastewater buffer tank 100; that is, the distance between the two liquid level pipes accounts for 80% of the overall height of the wastewater buffer tank 100.

[0044] Further, such as Figure 1 As shown, a valve 131 is provided on the lower liquid level pipe, and a valve 121 is provided on the upper liquid level pipe; these are suitable for controlling the on and off of the two liquid level pipes at any time.

[0045] In a possible implementation, the wastewater buffer tank 100 is also provided with: a differential pressure gauge 170; a first pressure water pipe 150 and a second pressure water pipe 160 are provided on the side wall of the wastewater buffer tank 100, and the first pressure water pipe 150 is arranged above the second pressure water pipe 160, and a preset distance is provided between the first pressure water pipe 150 and the second pressure water pipe 160; one end of the first pressure water pipe 150 and one end of the second pressure water pipe 160 are both connected to the interior of the cavity of the wastewater buffer tank 100, and the other end of the first pressure water pipe 150 and the other end of the second pressure water pipe 160 are both connected to the differential pressure gauge 170. It should be noted that the wastewater flows into the first pressure water pipe 150 and the second pressure water pipe 160 and contacts the differential pressure gauge 170. The differential pressure gauge 170 can measure the difference between the liquid pressures in the first pressure water pipe 150 and the second pressure water pipe 160, and calculate the density of the wastewater in the wastewater buffer tank 100 by detecting the liquid pressure difference. The calculated density value is used to determine whether the wastewater in the wastewater buffer tank 100 needs to be discharged. When the calculated liquid density reaches the preset discharge density value, the wastewater is discharged from the wastewater buffer tank 100.

[0046] In a possible implementation, a sixth valve 151 is provided on the first pressure water pipe 150 , and a seventh valve 161 is provided on the second pressure water pipe 160 .

[0047] Further, the density value is calculated according to the liquid pressure calculation formula p=ρgh. (h is the height difference between the first pressure water pipe 150 and the second pressure water pipe 160, and g is a constant of 9.8)

[0048] Preferably, the height of the second pressure water pipe 160 from the bottom of the wastewater buffer tank 100 accounts for 15% of the overall height of the wastewater buffer tank 100 ; the distance between the first pressure water pipe 150 and the second pressure water pipe 160 accounts for 40% of the overall height of the wastewater buffer tank 100 .

[0049] Preferably, the distance between the first pressure water pipe 150 and the second pressure water pipe 160 is 1 meter (h is 1 meter).

[0050] Preferably, the preset value of drainage density is 1200 kg / m 3 ; When the wastewater density in the wastewater buffer tank 100 reaches 1200kg / m 3 When the wastewater is discharged from the wastewater buffer tank 100.

[0051] In a possible implementation, the wastewater buffer tank 100 is provided with a drain pipe 180, which is suitable for discharging wastewater reaching a preset discharge density value from the wastewater buffer tank 100. Furthermore, the drain pipe 180 is located at the bottom of the wastewater buffer tank 100, so that the wastewater can be discharged from the wastewater buffer tank 100 in a timely manner under the action of pressure, and the wastewater discharged from the drain pipe 180 can be sent to the next process for deep treatment.

[0052] In a possible implementation, a fourth valve 181 is provided on the drain pipe 180 , which is suitable for controlling the opening and closing of the drain pipe 180 .

[0053] In a possible implementation, a third temperature sensor 110 is provided on the top of the wastewater buffer tank 100 , and a detection end of the third temperature sensor 110 is located inside the cavity of the wastewater buffer tank 100 , and is suitable for detecting the temperature inside the wastewater buffer tank 100 .

[0054] In a possible implementation, one end of the wastewater circulation pipe 300 is connected to the interior of the cavity of the wastewater buffer tank 100, and the other end of the wastewater circulation pipe 300 is connected to the water inlet inner pipe 230; a second valve 310 is provided on the wastewater circulation pipe 300, and the second valve 310 and the wastewater circulation pump 320 are arranged in sequence along the flow direction of the wastewater in the wastewater circulation pipe 300. It should be noted that the second valve 310 is suitable for controlling the on-off of the wastewater circulation pipe 300.

[0055] In a possible implementation, the wastewater circulation pipe 300 is provided with a third flow sensor 330, and the second valve 310, the wastewater circulation pump 320 and the third flow sensor 330 are arranged in sequence along the flow direction of the wastewater in the wastewater circulation pipe 300. Here, it should be noted that the third flow sensor 330 is suitable for detecting the flow data of the wastewater in the wastewater circulation pipe 300.

[0056] In a possible implementation, the wastewater circulation pipe 300 is provided with a third valve 340 , and the second valve 310 and the third valve 340 are respectively located at two ends of the wastewater circulation pump 320 .

[0057] In a possible implementation, two wastewater circulation pipes 300 are provided, one end of each of the two wastewater circulation pipes 300 is connected to the wastewater buffer tank 100, and the other end of each of the two wastewater circulation pipes 300 is connected to the water inlet inner pipe 230. Furthermore, the two wastewater circulation pipes 300 are provided with a second valve 310, a wastewater circulation pump 320, a third flow sensor 330 and a third valve 340.

[0058] It should be noted that the two wastewater circulation pipes 300 are suitable for alternate use, working in the form of one in use and one in reserve, so as to avoid affecting the service life of only one wastewater circulation pump 320 by using it for a long time; that is, when one wastewater circulation pump 320 is running, the second valve 310 and the third valve 340 on the wastewater circulation pipe 300 where the wastewater circulation pump 320 is located should be opened, and the second valve 310 and the third valve 340 on the other wastewater circulation pipe 300 should be closed.

[0059] In a possible implementation, a main valve 350 is provided at one end where the two wastewater circulation pipes 300 converge, and is suitable for controlling the on-off of the two wastewater circulation pipes 300 .

[0060] In a possible implementation, it also includes: a return pipe 500; one end of the return pipe 500 is connected to the wastewater circulation pipe 300, and the other end of the return pipe 500 extends into the cavity of the wastewater buffer tank 100. It should be noted that when the flue gas evaporation device 200 or the wastewater circulation pump 320 fails or the wastewater circulation pump 320 needs to be debugged, the wastewater remaining in the wastewater circulation pipe 300 flows back from the return pipe 500 to the wastewater buffer tank 100, and the wastewater in the wastewater circulation pipe 300 is drained.

[0061] In a possible implementation, a fifth valve 510 is provided on the reflux pipe 500, which is suitable for controlling the opening and closing of the reflux pipe.

[0062] In one possible implementation, Figure 2 As shown, the smoke evaporation device 200 includes: an evaporation box 250, in which more than two evaporation plates are arranged, and the more than two evaporation plates are stacked, and the same preset distance is set between any two adjacent evaporation plates.

[0063] In one possible implementation, Figure 3 As shown, the evaporation plate includes: a plate surface 210, a water inlet 211, and a water outlet 215; the water inlet 211 and the water outlet 215 are respectively arranged at both ends of the plate surface 210, and the water inlet 211 is connected with the water outlet 215 through the plate surface 210; each water inlet 211 is provided with an opening 212 on the side facing the evaporation plate, and the water inlet 211 of the evaporation plate corresponds to each first branch pipe 231 of the water inlet inner pipe 230, respectively, and the first branch pipe 231 is inserted into the inside of the water inlet 211, and the wastewater in the water inlet inner pipe 230 passes through the multiple first branch pipes 231 of the water inlet inner pipe 230. 1 flows into the water inlet 211 of the multiple evaporation plates, and then flows to the plate surface 210 from the opening 212 of the water inlet 211. The top of the water outlet 215 is provided with multiple water holes 214. The wastewater on the plate surface 210 flows from one side of the water inlet 211 to one side of the water outlet 215, and flows into the inside of the water outlet 215 from the water holes 214 of the water outlet 215. The water outlet 215 of the evaporation plate is respectively opposite to each water inlet 242 of the water outlet inner pipe 240. The wastewater in the water outlet 215 enters the water outlet inner pipe 240, and finally flows back to the wastewater buffer tank 100 from the water outlet inner pipe 240.

[0064] In one possible implementation, a buffer groove 213 is provided between the plate surface 210 and the water inlet 211. The cross-section of the buffer groove 213 is a triangular groove structure. It should be noted that the setting of the buffer groove 213 is suitable for improving the flow uniformity and dispersion of water on the plate surface 210 to improve the evaporation efficiency of water.

[0065] In a possible implementation, a baffle 216 is vertically disposed on the top surface of the water outlet portion 215 of the evaporation plate, and the baffle 216 is suitable for blocking the overflow of wastewater.

[0066] It should be noted that if Figure 2 As shown, the evaporation plate is arranged in the evaporation box 250 at a certain tilt angle, and a preset angle a is set between the plane where the plate surface 210 of the evaporation plate is located and the horizontal plane; and the side of the water inlet 211 is higher than the side of the water outlet 215, so that the waste water can flow on the plate surface 210. Both sides of the body length of the evaporation plate are in contact with the inner wall of the evaporation box 250 to prevent the waste water on the plate surface 210 from overflowing from both sides of the plate surface 210 during the flow process.

[0067] In a possible implementation, the evaporation plate is disposed in the evaporation box 250 via the support plate 220; Figure 2 As shown, the support plate 220 is also fixed in the evaporation box 250 at a certain inclination angle. The four sides of the support plate 220 are fixedly connected to the inner wall of the evaporation box 250, and an evaporation plate is placed above the support plate 220; further, the number of the support plates 220 is the same as the number of the evaporation plates, and an evaporation plate is placed on each support plate 220. Under the support of the support plate 220, the evaporation plate can be placed in the evaporation box 250 at a certain inclination angle.

[0068] Preferably, the distance between two upper and lower adjacent evaporation plates is 500 mm; and the preset inclination angle a of the evaporation plate ranges from 5° to 20°.

[0069] Furthermore, the main structure of the water inlet inner pipe 230 is as follows Figure 4 As shown, a first branch pipe 231 is provided at each water inlet hole 232 of the water inlet inner pipe 230, and more than two first branch pipes 231 pass through the through holes on the side wall of the evaporation box 250 and are respectively inserted into the water inlet part 211 of each evaporation plate, and the waste water in the water inlet inner pipe 230 flows from the first branch pipe 231 into the water inlet part 211.

[0070] Furthermore, the main structure of the inner water outlet pipe 240 is as follows: Figure 5 As shown, each water outlet hole 242 of the water outlet inner tube 240 is provided with a second branch pipe 241, and more than two second branch pipes 241 pass through the through holes on the side wall of the evaporation box 250 and are respectively inserted into the water outlet portion 215 of each evaporation plate. After the waste water flows into the water outlet portion 215, it flows into the water outlet inner tube 240 from the second branch pipe 241.

[0071] In a possible implementation, a first temperature sensor 610 is provided on the flue gas inlet pipe 600, which is suitable for detecting the gas temperature in the flue gas inlet pipe 600. The flow direction of the gas in the flue gas inlet pipe 600 is opposite to the flow direction of the wastewater on the plate surface 210, so as to improve the evaporation efficiency in the form of convection evaporation.

[0072] Preferably, the flue gas temperature in the flue gas inlet pipe 600 is 120°C.

[0073] In a possible implementation, a second temperature sensor 710 is provided on the smoke outlet pipe 700 , which is suitable for detecting the gas temperature in the smoke outlet pipe 700 .

[0074] In a possible implementation, it also includes: a first cleaning pipe, one end of which is suitable for introducing process water, and the other end of the first cleaning pipe is connected to the wastewater circulation pump 320 and is suitable for regularly cleaning the wastewater circulation pump 320, and a valve 900 is provided on the first cleaning pipe.

[0075] In a possible implementation, it also includes: a second clean pipe 910 and a third clean pipe 920; one end of the second clean pipe 910 and the third clean pipe 920 are both suitable for introducing process water, and the other ends of the second clean pipe 910 and the third clean pipe 920 are respectively connected to two wastewater circulation pipes 300 and are suitable for regularly cleaning the two wastewater circulation pipes 300, and a valve 911 is provided on the second clean pipe 910, and a valve 921 is provided on the third clean pipe 920.

[0076] In a possible implementation, it also includes: a fourth cleaning pipe 930; one end of the fourth cleaning pipe 930 is suitable for introducing process water, and the other end of the fourth cleaning pipe 930 is connected to the first pressure water pipe 150 and the second pressure water pipe 160 and is suitable for regularly cleaning the first pressure water pipe 150 and the second pressure water pipe 160, and a valve 931 is provided at one end of the fourth cleaning pipe 930 connected to the first pressure water pipe 150 and one end of the fourth cleaning pipe 930 connected to the second pressure water pipe 160.

[0077] It should be noted that after each time a certain amount of wastewater evaporation and emission reduction is completed, the wastewater circulation pump 320, the wastewater circulation pipe 300, the first pressure water pipe 150 and the second pressure water pipe 160 need to be cleaned to avoid salt accumulation inside the pipes and affect the circulation rate of the wastewater.

[0078] The working process of the present application is described as follows: in the initial state, valve 121, valve 131, the sixth valve 151, and the seventh valve 161 are all in the normally open state; the fifth valve 510, valve 911, valve 921, valve 900, and the two valves 931 are all in the normally closed state;

[0079] First, the stirring device is turned on; then the first valve 420 is opened, and the wastewater enters the wastewater buffer tank 100 from the wastewater inlet pipe 400; then, one of the wastewater circulation pumps 320 and the second valve 310 and the third valve 340 before and after it are opened; under the action of the wastewater circulation pump 320, the wastewater enters the wastewater circulation pipe 300 and the flue gas evaporation device 200, and then flows back to the wastewater buffer tank 100 from the wastewater outlet pipe 800, thereby forming an evaporation cycle;

[0080] At the same time, the liquid level meter 140 measures the liquid level in the wastewater buffer tank 100, and determines whether it is necessary to control the closing of the first valve 420 according to the measured liquid level; when the liquid level measured by the liquid level meter 140 is higher than the uppermost liquid level tube, the first valve 420 is controlled to be closed;

[0081] At the same time, the differential pressure gauge 170 measures the liquid pressure difference in the wastewater buffer tank 100, and measures the liquid density in the wastewater buffer tank 100 according to the liquid pressure difference, and determines whether the wastewater needs to be discharged from the wastewater buffer tank 100 according to the liquid density; when the liquid density is greater than the preset value of the discharge density, the first valve 420 is closed, and the fourth valve 181 is opened, and the wastewater in the wastewater buffer tank 100 flows out from the drain pipe 180;

[0082] After a certain amount of desulfurization wastewater has been evaporated, the fifth valve 510 is opened, the main valve 350 is closed, and the excess wastewater flows back into the wastewater buffer tank 100 from the return pipe; then valves 911, 921, 900, and 931 are opened; process water cleans the wastewater circulation pipe 300, the first pressure water pipe 150, the second pressure water pipe 160, the wastewater circulation pump 320, and the wastewater buffer tank 100 to remove scale.

[0083] Preferably, the first valve 420, the second valve 310, the third valve 340, and the fourth valve 181 are all electric valves; the closing and opening of each valve are controlled by the DSP control system, and the differential pressure gauge 170 uploads the measured liquid pressure difference to the DSP control system. The DSP control system calculates the density value of the wastewater in the wastewater buffer tank 100, and compares the calculated density value with the preset value of the discharge density; when the wastewater density is greater than the preset value of the discharge density, the DSP control system controls the first valve 420 to close, the second valve 310 to close, the third valve 340 to close, and opens the fourth valve 181 to discharge the wastewater.

[0084] According to experiments, this application has a concentration effect of more than 4 times, that is, if the water intake is 10 tons / h, the water volume after concentration is: 2.510 tons / h. The emission reduction effect is excellent and can effectively achieve the purpose of wastewater evaporation and emission reduction.

[0085] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A flue gas concentration wastewater device, characterized in that: include: Wastewater inlet pipe, wastewater circulation pipe, wastewater buffer tank, wastewater outlet pipe, flue gas evaporation device, flue gas inlet pipe and flue gas outlet pipe; The wastewater inlet pipe is connected to the inlet of the wastewater buffer tank, which is suitable for introducing wastewater into the wastewater buffer tank; one end of the wastewater circulation pipe is connected to the outlet of the wastewater buffer tank, and the other end of the wastewater circulation pipe is connected to the water inlet inner pipe of the flue gas evaporation device, which is suitable for transporting the wastewater from the wastewater buffer tank to the flue gas evaporation device; the water outlet inner pipe of the flue gas evaporation device is connected to one end of the wastewater outlet pipe, and the other end of the wastewater outlet pipe is inserted into the cavity of the wastewater buffer tank, which is suitable for transporting the evaporated wastewater from the flue gas evaporation device back to the wastewater buffer tank; The wastewater circulation pipe is provided with a wastewater circulation pump; The water inlet inner tube of the flue gas evaporation device is provided with more than two water outlet holes, and the water outlet inner tube of the flue gas evaporation device is provided with more than two water inlet holes; the flue gas evaporation device is provided with more than two evaporation plates; and the more than two water outlet holes are connected to the more than two water inlet holes through the more than two evaporation plates respectively; An air inlet suitable for connecting to the smoke inlet pipe is provided on one side of the smoke evaporation device, and an air outlet suitable for connecting to the smoke outlet pipe is provided on the opposite side, which is suitable for introducing smoke from the smoke inlet pipe into the cavity of the smoke evaporation device and evaporating the wastewater on the evaporation plate before flowing out from the smoke outlet pipe.

2. The flue gas concentration wastewater device according to claim 1, characterized in that: The wastewater inlet pipe is provided with a first flow sensor and a first valve; The first flow sensor and the first valve are arranged in sequence along the flow direction of water in the wastewater inlet pipe.

3. The flue gas concentration wastewater device according to claim 1, characterized in that: Also includes: Liquid level gauge; Two liquid level tubes are arranged on the side wall of the wastewater buffer tank, and the two liquid level tubes are respectively connected to the two interface pipes of the liquid level meter.

4. The flue gas concentration wastewater device according to claim 1, characterized in that: Also includes: Differential pressure gauge; A first pressure water pipe and a second pressure water pipe are provided on the side wall of the wastewater buffer tank, and the first pressure water pipe is arranged above the second pressure water pipe, and a preset distance is provided between the first pressure water pipe and the second pressure water pipe; The first pressure water pipe and the second pressure water pipe are both connected to the differential pressure gauge.

5. The flue gas concentration wastewater device according to claim 1, characterized in that: The wastewater buffer tank is provided with a drain pipe, which is suitable for discharging concentrated wastewater from the wastewater buffer tank.

6. The flue gas concentration wastewater device according to claim 1, characterized in that: The wastewater circulation pipe is provided with a second valve, and the second valve and the wastewater circulation pump are arranged in sequence along the flow direction of the wastewater in the wastewater circulation pipe.

7. The flue gas concentration wastewater device according to claim 1, characterized in that: Two wastewater circulation pipes are provided, one end of each of the two wastewater circulation pipes is connected to the wastewater buffer tank, and the other end of each of the two wastewater circulation pipes is connected to the water inlet inner pipe.

8. The flue gas concentration wastewater device according to claim 1, characterized in that: The smoke inlet pipe is provided with a first temperature sensor.

9. The flue gas concentration wastewater device according to claim 1, characterized in that: A second temperature sensor is provided on the smoke outlet pipe.

10. The flue gas concentration wastewater device according to claim 1, characterized in that: Also includes: Return pipe; One end of the reflux pipe is connected to the wastewater circulation pipe, and the other end of the reflux pipe is inserted into the cavity of the wastewater buffer tank.

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