Flue gas concentration wastewater device

Abstract

The utility model 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 application relates to the field of wastewater desulfurization technology, and particularly relates to a flue gas concentrated wastewater device. BACKGROUND

[0002] Thermal power plants are large water users, and water obtained from nature is used in system operation, resulting in a large amount of desulfurization wastewater discharge. Desulfurization wastewater, as the last wastewater of a coal-fired power plant, contains impurities mainly including suspended solids, supersaturated sulfites and sulfates, many of which are the first class of pollutants that are strictly controlled in national environmental protection standards. If a large amount of desulfurization wastewater is directly discharged into a natural water system, a large degree of environmental pollution will be caused. Therefore, it is an indispensable link to realize desulfurization wastewater discharge reduction.

[0003] The application provides a flue gas concentrated wastewater device suitable for desulfurization wastewater evaporation and discharge reduction. SUMMARY

[0004] Therefore, the application provides a flue gas concentrated wastewater device.

[0005] According to an aspect of the application, a flue gas concentrated wastewater device is provided, which 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.

[0006] The wastewater inlet pipe is connected with the inlet of the wastewater buffer tank and is suitable for introducing wastewater into the wastewater buffer tank; one end of the wastewater circulating pipe is connected with the outlet of the wastewater buffer tank, and the other end of the wastewater circulating pipe is connected with the water inlet inner pipe of the flue gas evaporation device and is suitable for conveying 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 with 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 and is suitable for sending evaporated wastewater from the flue gas evaporation device back to the wastewater buffer tank.

[0007] A wastewater circulating pump is arranged on the wastewater circulating pipe.

[0008] Two or more water outlet holes are arranged on the water inlet inner pipe of the flue gas evaporation device, and two or more water inlet holes are arranged on the water outlet inner pipe of the flue gas evaporation device; two or more evaporation plates are arranged in the flue gas evaporation device; and the two or more water outlet holes are in communication with the two or more water inlet holes through the two or more evaporation plates.

[0009] An air inlet suitable for connecting the flue gas inlet pipe is arranged on one side of the flue gas evaporation device, and an air outlet suitable for connecting the flue gas outlet pipe is arranged on the opposite side, which is suitable for introducing flue gas from the flue gas inlet pipe into the cavity of the flue gas evaporation device and evaporating wastewater on the evaporation plates and then flowing out from the flue gas outlet pipe.

[0010] In a possible implementation, 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.

[0011] In a possible implementation, the wastewater buffer tank further comprises a liquid level meter.

[0012] The sidewall of the wastewater buffer tank is provided with two liquid level pipes, and the two liquid level pipes are connected to two interface pipes of the liquid level meter.

[0013] In a possible implementation, the wastewater buffer tank further comprises a differential pressure meter.

[0014] The sidewall of the wastewater buffer tank is provided with a first pressure water pipe and a second pressure water pipe, and the first pressure water pipe is arranged above the second pressure water pipe; a preset distance is arranged 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 connected to the differential pressure meter.

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

[0018] In a possible implementation, the wastewater circulation pipe is provided with two wastewater circulation pipes, 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 pipe.

[0019] In a possible implementation, the flue gas inlet pipe is provided with a first temperature sensor.

[0020] In a possible implementation, the flue gas outlet pipe is provided with a second temperature sensor.

[0021] In a possible implementation, the wastewater buffer tank further comprises a backflow pipe.

[0022] One end of the backflow pipe is connected to the wastewater circulation pipe, and the other end of the backflow 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 after evaporation of the flue gas evaporation device; the flue gas evaporation device is suitable for evaporating and concentrating the wastewater; the concentrated wastewater enters the wastewater buffer tank again, so that the wastewater in the wastewater buffer tank is evaporated and concentrated in a cycle until the wastewater in the wastewater buffer tank reaches a certain density and is discharged. The application can evaporate the wastewater in a multiple reciprocating cycle until the density of the wastewater in the final wastewater buffer tank reaches a certain height, and then the wastewater is discharged; thereby reducing the discharge of wastewater, and the cost is low, and the investment cost of wastewater concentration can be reduced.

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

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

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

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

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

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

[0030] Figure 5 A main structure diagram of a water outlet inner pipe according to an embodiment of the present application is shown.

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

[0032] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0033] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0036] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented without certain specific details. In some instances, methods, means, components, and circuits well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0037] Figure 1 A structural connection diagram of a flue gas concentration wastewater apparatus according to an embodiment of this application is shown. Figure 1As shown, the flue gas concentrated wastewater device comprises a wastewater inlet pipe 400, a wastewater circulating 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 with 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 circulating pipe 300 is connected with the outlet of the wastewater buffer tank 100, and the other end of the wastewater circulating pipe 300 is connected with the water inlet inner pipe 230 of the flue gas evaporation device 200 and is suitable for conveying 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 with 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 sending evaporated wastewater from the flue gas evaporation device 200 back to the wastewater buffer tank 100; the wastewater circulating pump 320 is arranged on the wastewater circulating pipe 300; the water outlet holes 232 are arranged on the water inlet inner pipe 230 of the flue gas evaporation device 200, and the water inlet holes 242 are arranged on the water outlet inner pipe 240 of the flue gas evaporation device 200; the flue gas evaporation device 200 is internally provided with two or more evaporation plates; the two or more water outlet holes 232 are respectively communicated with the two or more water inlet holes 242 through the two or more evaporation plates; the flue gas evaporation device 200 is provided with the gas inlet on one side and is suitable for connecting the flue gas inlet pipe 600, and is provided with the gas outlet on the opposite side and is suitable for connecting the flue gas outlet pipe 700, which is suitable for introducing 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 and then 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 after evaporation of the flue gas evaporation device 200; the flue gas evaporation device 200 is suitable for evaporating and concentrating wastewater; the concentrated wastewater enters the wastewater buffer tank 100 again, so that the wastewater in the wastewater buffer tank 100 is evaporated and concentrated in a cycle 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 circulating pipe 300 is suitable for sending the 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 is provided with two or more water outlet holes 232, and the water outlet holes 232 are in communication with the evaporation plate, the wastewater in the water inlet inner pipe 230 can flow onto the evaporation plate through the water outlet holes 232, and then the wastewater flows through the plate surface 210 of the evaporation plate and 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 with 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 circulating pump 320, the wastewater in the wastewater buffer tank 100 flows into the wastewater circulating pipe 300 and is sent into the flue gas evaporation device 200 again for repeated evaporation and concentration. Further, one side of the flue gas evaporation device 200 is provided with a gas inlet suitable for connecting the flue gas inlet pipe 600, which is suitable for introducing flue gas into the flue gas evaporation device 200 through the flue gas inlet pipe 600. The flue gas and the wastewater on the evaporation plate are in countercurrent flow, and in this process, the flue gas carries away a small amount of water vapor from the wastewater, so that the water and the salt are separated. In the continuous circulation process, the salt in the wastewater buffer tank 100 will become more and more, the water will become less and less, and the density of the wastewater will become larger and larger; the opposite side of the gas inlet is provided with a gas outlet suitable for connecting the flue gas outlet pipe 700, which is suitable for introducing the flue gas from the flue gas outlet pipe 700. The present application can perform multiple reciprocating evaporation on the wastewater, until the density of the wastewater in the wastewater buffer tank 100 reaches a certain height, and then the wastewater is discharged; thereby reducing the discharge of wastewater, and reducing the investment cost of wastewater concentration.

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

[0040] In one possible implementation, the wastewater buffer tank 100 is equipped with a stirring device 190 inside its cavity, which is suitable for stirring the wastewater inside the wastewater buffer tank 100 to prevent salt from depositing at the bottom of the wastewater buffer tank 100 and affecting the differential pressure gauge 170's measurement of the wastewater density. Furthermore, the stirring device 190 is a pulse suspension stirring device, and the pulse suspension nozzles of the pulse suspension stirring device are all directed towards the bottom of the wastewater buffer tank 100.

[0041] In one possible implementation, the system further includes: a level gauge 140; two level tubes are provided on the side wall of the wastewater buffer tank 100, located at different heights within the tank. These tubes are connected to the interface tubes 120 and 130 of the level gauge, respectively, and are used to detect whether the liquid level in the wastewater buffer tank 100 remains within a preset range. It should be noted that when the liquid level in the wastewater buffer tank 100 reaches the highest preset level (above the upper level tube), or when the liquid level drops below the lowest preset level (below the lower level tube), this information can be displayed by the level gauge 140. This allows staff or controllers to control the opening and closing of the first valve 420 at any time, preventing excessive wastewater flow in the wastewater buffer tank 100.

[0042] Furthermore, the level gauge 140 adopts a magnetic float level gauge, which has its own interface pipe 120 and interface pipe 130. The interface pipe 120 is connected to the level pipe above the wastewater buffer tank 100, and the interface pipe 130 is connected to the level pipe below the wastewater buffer tank 100.

[0043] Preferably, the height of the lower liquid level pipe from the bottom of the wastewater buffer tank 100 is 10% of the overall height of the wastewater buffer tank 100; the height of the upper liquid level pipe from the bottom of the wastewater buffer tank 100 is 90% of the overall height of the wastewater buffer tank 100; that is, the distance between the two liquid level pipes is 80% of the overall height of the wastewater buffer tank 100.

[0044] Furthermore, such as Figure 1 As shown, valve 131 is provided on the lower liquid level tube, and valve 121 is provided on the upper liquid level tube; this is suitable for controlling the opening and closing of the two liquid level tubes at any time.

[0045] In a possible implementation, the wastewater buffer tank 100 is further provided with: a differential pressure meter 170; a first pressure water pipe 150 and a second pressure water pipe 160 are arranged 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 arranged 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 in communication with the inside 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 meter 170. It should be noted that the wastewater flows into and contacts the differential pressure meter 170 from the first pressure water pipe 150 and the second pressure water pipe 160, the differential pressure meter 170 can measure the pressure difference of the liquid in the first pressure water pipe 150 and the second pressure water pipe 160, and calculate the density value of the wastewater in the wastewater buffer tank 100 by detecting the liquid pressure difference; according to the calculated density value, it is judged whether the wastewater in the wastewater buffer tank 100 needs to be discharged, and when the calculated liquid density reaches the preset liquid discharge density value, the wastewater is discharged from the wastewater buffer tank 100.

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

[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; and 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 liquid discharge density value is 1200 kg / m 3 ; and when the density of the wastewater in the wastewater buffer tank 100 reaches 1200 kg / m 3 , 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 the wastewater reaching the preset liquid discharge density value from the wastewater buffer tank 100. Further, the drain pipe 180 is located at the bottom end of the wastewater buffer tank 100, which facilitates the wastewater to be discharged from the wastewater buffer tank 100 under the action of pressure in time, and the wastewater discharged from the drain pipe 180 can be sent to the next process for further treatment.

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

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

[0054] In a possible implementation, one end of the wastewater circulation pipe 300 is in communication with the cavity inside the wastewater buffer tank 100, and the other end of the wastewater circulation pipe 300 is connected with the water inlet inner pipe 230; the wastewater circulation pipe 300 is provided with a second valve 310, and the second valve 310 and a wastewater circulation pump 320 are arranged in sequence along the flow direction of wastewater in the wastewater circulation pipe 300. It should be noted that the second valve 310 is suitable for controlling the opening and closing 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 wastewater in the wastewater circulation pipe 300. It should be noted that the third flow sensor 330 is suitable for detecting the flow data of 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 with the wastewater buffer tank 100, and the other end of each of the two wastewater circulation pipes 300 is connected with the water inlet inner pipe 230. Further, the second valve 310, the wastewater circulation pump 320, the third flow sensor 330 and the third valve 340 are provided on each of the two wastewater circulation pipes 300.

[0058] It should be noted that the two wastewater circulation pipes 300 are suitable for being alternately put into use, and work in the form of one in use and one in standby, so as to avoid affecting the service life of a single wastewater circulation pump 320 due to long-time use of the single wastewater circulation pump 320; 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 are opened, and the second valve 310 and the third valve 340 on the other wastewater circulation pipe 300 are closed.

[0059] In a possible implementation, one end of the two wastewater circulation pipes 300 is provided with a total valve 350; the total valve 350 is suitable for controlling the opening and closing of the two wastewater circulation pipes 300.

[0060] In a possible implementation, the system further comprises a backflow pipe 500; one end of the backflow pipe 500 is connected to the wastewater circulation pipe 300, and the other end of the backflow pipe 500 is inserted into the cavity of the wastewater buffer tank 100; it is to be noted that when the flue gas evaporating device 200 or the wastewater circulation pump 320 fails or needs to be debugged, the wastewater remaining in the wastewater circulation pipe 300 flows back to the wastewater buffer tank 100 through the backflow pipe 500, and the wastewater in the wastewater circulation pipe 300 is emptied.

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

[0062] In a possible implementation, as shown in Figure 2 FIG. 2, the flue gas evaporating device 200 comprises an evaporation box 250; the evaporation box 250 is provided with two or more evaporation plates; the two or more evaporation plates are arranged in a stacked manner; and the same preset distance is provided between any two adjacent evaporation plates.

[0063] In a possible implementation, as shown in Figure 3 FIG. 3, the evaporation plate comprises a plate surface 210, a water inlet portion 211, and a water outlet portion 215; the water inlet portion 211 and the water outlet portion 215 are arranged at two ends of the plate surface 210, respectively; the water inlet portion 211 is in communication with the water outlet portion 215 through the plate surface 210; each water inlet portion 211 is provided with an opening 212 on the side of the evaporation plate; the water inlet portion 211 of the evaporation plate corresponds to each first branch pipe 231 of the water inlet inner pipe 230, respectively; the first branch pipe 231 is inserted into the water inlet portion 211; the wastewater in the water inlet inner pipe 230 flows into the water inlet portion 211 of the evaporation plate through the plurality of first branch pipes 231 of the water inlet inner pipe 230, and then flows onto the plate surface 210 from the opening 212 of the water inlet portion 211; the water outlet portion 215 is provided with a plurality of water holes 214 on the top; the wastewater on the plate surface 210 flows from the water inlet portion 211 to the water outlet portion 215, and then flows into the water outlet portion 215 from the water holes 214 of the water outlet portion 215; the water outlet portion 215 of the evaporation plate corresponds to each water inlet 242 of the water outlet inner pipe 240, respectively; the wastewater in the water outlet portion 215 flows into 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 a possible implementation, a buffer groove 213 is arranged between the plate surface 210 and the water inlet portion 211; the buffer groove 213 has a triangular groove structure in cross section; it is to be noted that the buffer groove 213 is suitable for improving the uniformity and dispersity of the water flow on the plate surface 210, so as to improve the evaporation efficiency of the water.

[0065] In a possible implementation, the top surface of the water outlet part 215 of the evaporation plate is vertically provided with a baffle 216, which is suitable for blocking the flow of wastewater.

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

[0067] In a possible implementation, the evaporation plate is arranged in the evaporation box 250 through the support plate 220. As shown in Figure 2 The support plate 220 is also arranged in the evaporation box 250 at a certain inclination angle, and the periphery of the support plate 220 is fixedly connected with the inner wall of the evaporation box 250. The evaporation plate is placed above the support plate 220. Further, the number of the support plates 220 is the same as that of the evaporation plates, and one evaporation plate is placed on each support plate 220. Under the support of the support plate 220, the evaporation plate can be arranged in the evaporation box 250 at a certain inclination angle.

[0068] Preferably, the distance between the upper and lower adjacent evaporation plates is 500 mm, and the preset inclination angle a of the evaporation plate is in the range of 5°-20°.

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

[0070] Further, the main structure of the water outlet inner pipe 240 is shown in Figure 5 Each water outlet hole 242 of the water outlet inner pipe 240 is provided with a second branch pipe 241, and more than two second branch pipes 241 pass through the through holes in the side wall of the evaporation box 250 and are respectively inserted into the water outlet part 215 of each evaporation plate. After flowing into the water outlet part 215, the wastewater flows into the water outlet inner pipe 240 from the second branch pipe 241.

[0071] In a possible implementation, the flue gas inlet pipe 600 is provided with a first temperature sensor 610, which is adapted to detect the temperature of the gas 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 counterflow evaporation.

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

[0073] In a possible implementation, the flue gas outlet pipe 700 is provided with a second temperature sensor 710, which is adapted to detect the temperature of the gas in the flue gas outlet pipe 700.

[0074] In a possible implementation, the system further comprises a first cleaning pipe, one end of the first cleaning pipe being adapted to introduce process water, the other end of the first cleaning pipe being in communication with the wastewater circulating pump 320 and being adapted to clean the wastewater circulating pump 320 at a regular time, and the first cleaning pipe is provided with a valve 900.

[0075] In a possible implementation, the system further comprises a second cleaning pipe 910 and a third cleaning pipe 920, one end of each of the second cleaning pipe 910 and the third cleaning pipe 920 being adapted to introduce process water, the other end of each of the second cleaning pipe 910 and the third cleaning pipe 920 being in communication with two wastewater circulating pipes 300 and being adapted to clean the two wastewater circulating pipes 300 at a regular time, and the second cleaning pipe 910 is provided with a valve 911 and the third cleaning pipe 920 is provided with a valve 921.

[0076] In a possible implementation, the system further comprises a fourth cleaning pipe 930, one end of the fourth cleaning pipe 930 being adapted to introduce process water, the other end of the fourth cleaning pipe 930 being in communication with the first pressure water pipe 150 and the second pressure water pipe 160 and being adapted to clean the first pressure water pipe 150 and the second pressure water pipe 160 at a regular time, and each of the end of the fourth cleaning pipe 930 connected to the first pressure water pipe 150 and the end of the fourth cleaning pipe 930 connected to the second pressure water pipe 160 is provided with a valve 931.

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

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

[0079] First, open the stirring device; then open the first valve 420, and the wastewater enters the wastewater buffer tank 100 from the wastewater inlet pipe 400; then open one of the wastewater circulating pumps 320 and the second valve 310 and the third valve 340 before and after it; under the action of the wastewater circulating pump 320, the wastewater enters the wastewater circulating pipe 300 and the flue gas evaporation device 200, and then flows back into the wastewater buffer tank 100 from the wastewater outlet pipe 800, so as to form 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 the first valve 420 needs to be closed according to the measured liquid level; when the liquid level measured by the liquid level meter 140 is higher than the uppermost liquid level pipe, the first valve 420 is controlled to be closed;

[0081] At the same time, the differential pressure meter 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 liquid 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] When a certain amount of desulfurization wastewater is evaporated, the fifth valve 510 is opened, the total valve 350 is closed, and the excess wastewater flows back into the wastewater buffer tank 100 from the backwater pipe; then the valve 911, the valve 921, the valve 900 and the valve 931 are opened; the process water cleans the wastewater circulating pipe 300, the first pressure water pipe 150, the second pressure water pipe 160, the wastewater circulating pump 320 and the wastewater buffer tank 100, and removes the 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 a DSP control system, the differential pressure meter 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 liquid discharge density; when the wastewater density is greater than the preset liquid discharge density, the DSP control system controls the first valve 420 to be closed, the second valve 310 to be closed, the third valve 340 to be closed, and the fourth valve 181 to be opened, so as to discharge the wastewater.

[0084] Through experiments, the application has an effect of more than 4 times of concentration, that is, if the water inflow is 10 tons / h, the water quantity after concentration is 2.510 tons / h. The emission reduction effect is superior, and the purpose of wastewater evaporation emission reduction can be effectively achieved.

[0085] Having described various embodiments of the application, it is to be understood that the above description is meant not to limit and not to encompass all of the possible embodiments. Many modifications and variations of this application can be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. It is intended that the scope of the application be defined by the scope of the patent and by the claims as allowed by the patent office, which can include adaptations based on the description, equivalents, and / or substitutions of elements individually or collectively to the entire disclosure.

Claims

1. A flue gas condensing wastewater plant, characterized in that The application relates to a waste water evaporation device. The waste water inlet pipe is connected with the waste water buffer tank inlet, and is suitable for introducing waste water into the waste water buffer tank; one end of the waste water circulation pipe is connected with the waste water buffer tank outlet, and the other end of the waste water circulation pipe is connected with the water inlet inner pipe of the smoke gas evaporation device, and is suitable for conveying waste water from the waste water buffer tank to the smoke gas evaporation device; the water outlet inner pipe of the smoke gas evaporation device is connected with one end of the waste water outlet pipe, and the other end of the waste water outlet pipe is inserted into the cavity of the waste water buffer tank, and is suitable for sending evaporated waste water from the smoke gas evaporation device back to the waste water buffer tank. A waste water circulation pump is arranged on the waste water circulation pipe. More than two water outlet holes are arranged on the water inlet inner pipe of the smoke gas evaporation device, more than two water inlet holes are arranged on the water outlet inner pipe of the smoke gas evaporation device, more than two evaporation plates are arranged in the smoke gas evaporation device, and the more than two water outlet holes are communicated with the more than two water inlet holes through the more than two evaporation plates. An air inlet suitable for connecting the smoke gas inlet pipe is arranged on one side of the smoke gas evaporation device, and an air outlet suitable for connecting the smoke gas outlet pipe is arranged on the opposite side, which is suitable for introducing smoke gas from the smoke gas inlet pipe into the cavity of the smoke gas evaporation device, evaporating the waste water on the evaporation plates, and then flowing out from the smoke gas outlet pipe. A first flow sensor and a first valve are arranged on the waste water inlet pipe.

2. The flue gas concentrating wastewater device according to claim 1, characterized by The first flow sensor and the first valve are arranged in sequence along the flow direction of water in the waste water inlet pipe. Further comprising:

3. The flue gas concentrating wastewater device according to claim 1, characterized by A liquid level meter; Two liquid level pipes are arranged on the side wall of the waste water buffer tank, and the two liquid level pipes are connected with two interface pipes of the liquid level meter. Further comprising:

4. The flue gas concentrating wastewater device according to claim 1, characterized by A differential pressure meter; A first pressure water pipe and a second pressure water pipe are arranged on the side wall of the waste water buffer tank, the first pressure water pipe is arranged above the second pressure water pipe, and a preset distance is arranged between the first pressure water pipe and the second pressure water pipe; The first pressure water pipe and the second pressure water pipe are connected with the differential pressure meter. The waste water buffer tank is provided with a drain pipe, which is suitable for discharging concentrated waste water from the waste water buffer tank.

5. The flue gas concentrating wastewater device according to claim 1, characterized by, The waste water circulation pipe is provided with a second valve, and the second valve and the waste water circulation pump are arranged in sequence along the flow direction of waste water in the waste water circulation pipe.

6. The flue gas concentrating wastewater device according to claim 1, characterized by Two waste water circulation pipes are arranged, one end of each of the two waste water circulation pipes is connected with the waste water buffer tank, and the other end of each of the two waste water circulation pipes is connected with the water inlet inner pipe.

7. The flue gas concentrating wastewater device according to claim 1, characterized by A first temperature sensor is arranged on the smoke gas inlet pipe.

8. The flue gas concentrating wastewater device of claim 1, wherein, A second temperature sensor is arranged on the smoke gas outlet pipe.

9. The flue gas concentrating wastewater device of claim 1, wherein, Further comprising:

10. The flue gas concentrating wastewater device of claim 1, wherein, A backflow pipe; One end of the backflow pipe is connected with the waste water circulation pipe, and the other end of the backflow pipe is inserted into the cavity of the waste water buffer tank. ​

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