Evaporation plate for waste water evaporation by flue gas

Abstract

The invention relates to an evaporation plate for waste water evaporation through flue gas. The evaporation plate comprises a main plate, a water inlet pipe and a water collecting pipe. The water inlet pipe and the water collecting pipe are respectively arranged at two ends of the main plate; a water outlet is formed in the side, facing the main plate, of the water inlet pipe, two or more water collecting holes are formed in the side, connected with the main plate, of the water collecting pipe, and waste water is suitable for flowing out of the water outlet of the water inlet pipe to the main plate and flowing into the water collecting holes of the water collecting pipe. An overflow groove is formed between the water inlet pipe and the main plate, and an opening of the overflow groove faces the water flowing side. The main plate is suitable for receiving wastewater and providing physical support for full contact of the wastewater and low-temperature flue gas, the water inlet pipe at one end of the main plate is suitable for introducing the wastewater, and the water collecting pipe at the other end of the main plate is suitable for outflow of the treated wastewater. The investment and operation cost can be reduced, and the requirements of environmental protection on thermal power plants at the present stage are met.

Description

Technical Field

[0001] This application relates to the field of wastewater desulfurization technology, and in particular to an evaporation plate for flue gas evaporation wastewater. Background Technology

[0002] Desulfurization wastewater is a high-concentration wastewater at the end of a thermal power plant. The chloride ion content in this wastewater exceeds 20,000 ppm, and there is no way to reuse it or where to go. Only by reducing the volume and using evaporation and drying technologies can it be made to achieve zero discharge in order to meet the current environmental protection requirements for thermal power plants.

[0003] One method utilizes the heat from low-temperature flue gas to evaporate and concentrate desulfurization wastewater, thus achieving pretreatment before discharge. This approach offers advantages such as system simplicity, low investment and operating costs, and minimal maintenance. However, this method requires contact between the low-temperature flue gas and the desulfurization wastewater, with the convection of the flue gas carrying away the moisture. Therefore, developing a support medium to ensure sufficient contact between the low-temperature flue gas and the wastewater is crucial. Summary of the Invention

[0004] In view of this, this application proposes an evaporation plate for flue gas evaporation wastewater, which is suitable for providing physical support for desulfurization wastewater when low-temperature flue gas comes into contact with desulfurization wastewater.

[0005] According to one aspect of this application, an evaporation plate for flue gas evaporation wastewater is provided, characterized in that it comprises: a main board, an inlet pipe, and a collection pipe;

[0006] The inlet pipe and the outlet pipe are respectively located at both ends of the main board;

[0007] The water inlet pipe has an outlet on the side facing the motherboard, and the water collection pipe has two or more water collection holes on the side connected to the motherboard. Wastewater is suitable for flowing from the outlet of the water inlet pipe onto the motherboard and into the water collection holes of the water collection pipe.

[0008] An overflow channel is provided between the water inlet pipe and the main board, with the opening of the overflow channel facing the side where the water flows.

[0009] In one possible implementation, the inlet pipe has openings at both ends, and the outlet is located on the side wall of the inlet pipe and extends along the length of the inlet pipe.

[0010] In one possible implementation, the side of the water inlet pipe with the water inlet hole is located in the same plane as the top surface of the motherboard.

[0011] In one possible implementation, two or more water collection holes are arranged in an array.

[0012] In one possible implementation, the water collection pipe is equipped with a baffle; the baffle is located on one side of the water collection hole.

[0013] In a possible implementation, the baffle is provided with a support; the support is arranged on the side of the baffle away from the water collecting hole.

[0014] In a possible implementation, the end surface of the overflow groove is in a triangular structure.

[0015] Beneficial effects: the main plate 100 is suitable for receiving wastewater and providing physical support for the full contact of wastewater and low-temperature flue gas, the water inlet pipe 200 at one end of the main plate 100 is suitable for introducing wastewater, and the water collecting pipe 300 at the other end of the main plate 100 is suitable for flowing out the treated wastewater, the wastewater flows out from the water outlet 210 of the water inlet pipe 200 to the main plate 100, and is laid flat on the main plate 100 to form a water film, which increases the water flow area and reduces the water flow thickness, so as to facilitate the full and complete contact with the flue gas, the overall structure of the application is simple, which not only can ensure the full contact of the wastewater and the flue gas and ensure the concentration effect of the wastewater, but also can reduce the investment and operation cost, and meet the requirements of environmental protection on thermal power plants at the present stage.

[0016] 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

[0017] 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 serve to explain the principles of the present application.

[0018] Figure 1 A main structure diagram of a flue gas evaporation wastewater evaporation plate according to an embodiment of the present application is shown;

[0019] Figure 2 A front view of a flue gas evaporation wastewater evaporation plate according to an embodiment of the present application is shown;

[0020] Figure 3 A side view of a flue gas evaporation wastewater evaporation plate according to an embodiment of the present application is shown;

[0021] Figure 4 A partial view of a flue gas evaporation wastewater evaporation plate according to an embodiment of the present application is shown;

[0022] Figure 5 A partial view of a flue gas evaporation wastewater evaporation plate according to an embodiment of the present application is shown;

[0023] Figure 6 A partial view of a flue gas evaporation wastewater evaporation plate according to an embodiment of the present application is shown;

[0024] Figure 7 A working installation schematic diagram of a flue gas evaporation wastewater evaporation plate according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0025] 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.

[0026] 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 used only for the convenience of describing this application 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 application.

[0027] 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 application, "multiple" means two or more, unless otherwise explicitly specified.

[0028] 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.

[0029] 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.

[0030] Figure 1 This diagram shows the main structure of an evaporation plate for flue gas evaporation wastewater, according to an embodiment of this application. Figure 1As shown, the flue gas evaporation wastewater evaporating plate comprises: a main plate 100, a water inlet pipe 200 and a water collecting pipe 300; the water inlet pipe 200 and the water collecting pipe 300 are respectively arranged at two ends of the main plate 100; the water inlet pipe 200 is provided with a water outlet 210 on the side facing the main plate 100, and the water collecting pipe 300 is provided with two or more water collecting holes 310 on the side connected to the main plate 100; the wastewater is suitable to flow out of the water outlet 210 of the water inlet pipe 200 onto the main plate 100 and into the water collecting holes 310 of the water collecting pipe 300; an overflow groove 400 is arranged between the water inlet pipe 200 and the main plate 100, and the opening of the overflow groove 400 faces the side where the water flows.

[0031] Here, it should be noted that the present application is applicable to the flue installed between the induced draft fan outlet and the desulfurization tower inlet, the main plate 100 is suitable for receiving wastewater and providing physical support for the full contact of wastewater and low-temperature flue gas, the water inlet pipe 200 at one end of the main plate 100 is suitable for introducing wastewater, and the water collecting pipe 300 at the other end of the main plate 100 is suitable for flowing out of the treated wastewater, the wastewater flows out of the water outlet 210 of the water inlet pipe 200 onto the main plate 100 and is laid flat on the main plate 100 to form a water film, which increases the water flow area and reduces the water flow thickness, so as to facilitate full and complete contact with the flue gas, the treated wastewater falls into the water collecting pipe 300 from the water collecting holes 310, and finally flows back into the storage tank from the water collecting pipe 300. The overflow groove 400 between the water inlet pipe 200 and the main plate 100 plays a role of buffering and deceleration, the wastewater first enters the overflow groove 400, when the wastewater in the overflow groove 400 is full, the wastewater overflows out of the overflow groove 400 and is laid flat on the main plate 100, which can ensure the uniform thickness of the water film on the main plate 100. The present application transports and distributes the wastewater onto the main plate 100, the wastewater contacts the low-temperature hot flue gas on the main plate 100, the moisture in the wastewater is taken away by the convection of the flue gas, the concentration and reduction of the wastewater are realized, the overall structure of the present application is simple, which not only can ensure the full contact of the wastewater and the flue gas and ensure the concentration effect of the wastewater, but also can reduce investment and operating costs, meet the requirements of environmental protection for thermal power plants at the present stage.

[0032] In a possible implementation, the main body of the main plate 100 is in a rectangular plate structure, the body length side of the water inlet pipe 200 and the body length side of the water collecting pipe 300 are respectively located at the two sides of the body width of the main plate 100, so that the wastewater flows along the body length direction of the main plate 100, to increase the flow path of the wastewater and improve the contact time with the flue gas, further ensuring the treatment effect of the wastewater.

[0033] Further, as shown in Figure 2 The length L2 of the main plate 100 is 75%≤L2≤85% of the overall length L1 of the flue gas evaporation wastewater evaporating plate. Preferably, the length L2 of the main plate 100 is 79% of the overall length L1 of the flue gas evaporation wastewater evaporating plate.

[0034] Further, the length L2 of the main plate 100 is 3-6 meters, the width L4 of the main plate 100 is 1-2 meters, the thickness L3 of the main plate 100 is 5-8 millimeters, and the surface roughness of the main plate 100 is Ra≤2.5 μm.

[0035] In a possible implementation, the water inlet pipe 200 is provided with openings at both ends, and the length side of the water inlet pipe 200 is connected to the width side of the main plate 100. The water outlet 210 is arranged on the side wall of the length side of the water inlet pipe 200 and extends along the length direction of the water inlet pipe 200. Figure 1 As shown in the figure, the main body of the water inlet pipe 200 is in a tubular structure, and the two ends are provided with openings. The side wall of the water inlet pipe 200 is provided with a water outlet 210, which is in a flat structure and penetrates the side wall of the water inlet pipe 200. The flat structure is beneficial to slow down the speed of the wastewater in the water inlet pipe 200 when passing through the water outlet 210, and forms a corresponding water flow to adapt to the main plate 100.

[0036] Further, the length of the water inlet pipe 200 is the same as the width L4 of the main plate 100. One side of the water outlet 210 of the water inlet pipe 200 is connected to the main plate 100, and the water outlet 210 is located above the main plate 100, so as to facilitate the wastewater to stay on the top surface of the main plate 100. Further, as shown in the figure, Figure 3 The overall length L1 of the flue gas evaporated wastewater evaporation plate is 5% of the overall width L5 of the water inlet pipe 200, and the overall length L1 of the flue gas evaporated wastewater evaporation plate is 10% of the overall width L5 of the water inlet pipe 200. Preferably, the overall width L5 of the water inlet pipe 200 is 5.4% of the overall length L1 of the flue gas evaporated wastewater evaporation plate. The height of the water outlet 210 of the water inlet pipe 200 is 10-50 millimeters.

[0037] Further, as shown in the figure, Figure 4 The water inlet pipe 200 is formed by bending a plate structure into a tubular structure, and the overall cross section is in a water droplet shape. The bending part of the water inlet pipe 200 is in a semicircular structure, and the diameter d1 is 40%-50% of the overall width L5 of the water inlet pipe 200. The width L10 of the bent part is 1 / 2 of the overall width L5 of the water inlet pipe 200.

[0038] In a possible implementation, the main body of the water collecting pipe 300 is in a tubular structure, and the two ends are provided with openings. The side wall of the water collecting pipe 300 is provided with a plurality of water collecting holes 310, and the treated wastewater can flow into the water collecting pipe 300 through the plurality of water collecting holes 310.

[0039] In a possible implementation, one side of the water collecting pipe 300, which is provided with the water collecting holes 310, is in the same plane as the top surface of the main plate 100, so as to improve the efficiency of the wastewater flow and avoid the accumulation of wastewater at the connecting part of the water collecting pipe 300 and the main plate 100. Further, 9% of the overall length L1 of the evaporation plate for flue gas evaporated wastewater ≤ the overall width L6 of the water collecting pipe 300 ≤ 12% of the overall length L1 of the evaporation plate for flue gas evaporated wastewater. Preferably, the overall width L5 of the water inlet pipe 200 is 9.9% of the overall length L1 of the evaporation plate for flue gas evaporated wastewater.

[0040] As shown in Figure 5 , the water collecting pipe 300 is also a tubular structure formed by bending the plate structure, and the overall cross section of the water collecting pipe 300 is in the shape of a water droplet. The bending part of the water collecting pipe 300 is in the shape of a semicircle, and the diameter d2 of the semicircle is 30% of the overall width L6 of the water collecting pipe 300.

[0041] Preferably, the water collecting pipe 300 and the main plate 100 are designed in one piece.

[0042] In a possible implementation, two or more water collecting holes 310 are arranged in an array. As shown in Figure 6 , further, the total area of all the water collecting holes 310 is more than 8 times the area of the water outlet 210 of the water inlet pipe 200.

[0043] In a possible implementation, there are 7 rows of water collecting holes 310, and the vertical distance L13 between any two adjacent rows of water collecting holes 310 is 43 mm; the distance L12 between any two adjacent water collecting holes 310 in each row is 25 mm.

[0044] As shown in Figure 6 , each water collecting hole 310 is in the shape of a circular hole, the diameter of each water collecting hole 310 is the same, and the diameter of each water collecting hole 310 ranges from 25 mm to 35 mm; preferably, the diameter of the water collecting hole 310 ranges from 30 mm.

[0045] In a possible implementation, the water collecting pipe 300 is provided with a baffle 500, and the baffle 500 is arranged on one side of the water collecting hole 310. As shown in the figure, the baffle 500 is arranged on the side of all the water collecting holes 310 away from the main plate 100, so as to avoid the water flow from the main plate 100 from rushing out of the water collecting pipe 300 due to the large flow speed of the wastewater, and the baffle 500 is arranged to block the wastewater, so that all the wastewater flows into the interior of the water collecting pipe 300 through the water collecting holes 310.

[0046] Further, the main body of the baffle 500 is in the shape of a rectangular plate, the length direction of the baffle 500 is parallel to the length direction of the water collecting pipe 300, and the length of the baffle 500 is the same as the length of the water collecting pipe 300.

[0047] Further, as shown in Figure 5 The height L11 of the baffle 500 is preferably 150 mm.

[0048] In one possible implementation, the baffle 500 is provided with a support 510, which is arranged on the side of the baffle 500 away from the water collecting hole 310. It should be noted that the support 510 is arranged on the side of the baffle 500 away from the main plate 100 to avoid the baffle 500 from being tilted due to the impact of the water flow.

[0049] In one possible implementation, the support 510 is provided with two or more supports 510, which are arranged along the length direction of the baffle 500, and the distance L8 between each two adjacent supports 510 is the same. Figure 3 Further, as shown in The distance L8 between each two adjacent supports 510 is preferably 200 mm.

[0050] Further, the support 510 has a triangular plate structure, one side of which is connected with the baffle 500, and the other side is connected with the outer side wall of the water collecting pipe 300.

[0051] Figure 2 In one possible implementation, the end surface of the overflow groove 400 has a triangular structure. As shown in The length of the overflow groove 400 is the same as the width of the main plate 100. The opening width L7 of the overflow groove is 3% to 5% of the overall length L1 of the evaporation plate for flue gas evaporated wastewater, and is preferably 3.9% of the overall length L1 of the evaporation plate for flue gas evaporated wastewater. The depth L9 of the overflow groove 400 is 150 mm to 180 mm, and is preferably 156 mm. The opening width L7 of the overflow groove 400 is 200 mm.

[0052] Further, the end surface of the overflow groove has a right-angled triangular structure, the angle a between the plane where the side of the overflow groove connected with the main plate 100 is located and the plane where the main plate 100 is located is 90 degrees, and the angle b between the two side walls of the overflow groove is 15 to 45 degrees.

[0053] Preferably, the two ends of the opening of the overflow groove 400 are integrally formed with the main plate 100 and the water inlet pipe 200.

[0054] Preferably, the ratio of the overall width L5 of the water inlet pipe 200, the opening width L7 of the overflow groove 400, the length L2 of the main plate 100, and the overall width L6 of the water collecting pipe 300 is 362.5:200:4189:522.5.

[0055] The whole material of the application adopts 2205 alloy which is resistant to chlorine ion corrosion.

[0056] As Figure 7 shown, the working schematic of the application is provided with flue equipment between the outlet of the induced draft fan and the inlet of the desulfurization tower, which is internally provided with multiple flues. Each flue gas evaporation wastewater evaporation plate is provided in the flue 600 with a certain inclination angle, and the height of the water collecting pipe 300 is lower than that of the water inlet pipe 200. Preferably, the inclination angle of the flue gas evaporation wastewater evaporation plate is ≥15°, so as to facilitate the wastewater to flow from the water inlet pipe 200 to the water collecting pipe 300. The flow direction of the flue gas blown by the induced draft fan is opposite to that of the wastewater, so as to facilitate the impact contact between the flue gas and the wastewater. Since the two ends of the flue are respectively communicated with the induced draft fan and the desulfurization tower, after the flue gas absorbs the water vapor in the wastewater on the application, it enters the desulfurization tower, which is equivalent to supplementing the water vapor for the unsaturated flue gas in advance. The desulfurization tower still needs to further desulfurize the flue gas.

[0057] It is further needed to be explained that the length of the flue gas evaporation wastewater evaporation plate is tightly combined with the inner side wall of the flue 600 to form a flow-through channel of the wastewater, so as to ensure that the wastewater only flows on the top surface of the flue gas evaporation wastewater evaporation plate and does not overflow from the two sides. The external wastewater pipe penetrates the side wall of the flue 600 and is inserted into one end of the water inlet pipe 200. The wastewater in the wastewater pipe can flow into the water inlet pipe 200 and flow from the water outlet 210 to the main plate 100. The other external wastewater pipe penetrates the side wall of the flue 600 and is inserted into one end of the water collecting pipe 300. After the wastewater treated by the low-temperature flue gas enters the water collecting pipe 300, it flows out from the wastewater pipe to the storage tank for the next concentration treatment.

[0058] The above has described the embodiments of the application. The above description is exemplary and is not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles, practical application or improvement of the technology in the market of the embodiments, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.

Claims

1. An evaporation plate for flue gas evaporation wastewater, characterized in that, include: Mainboard, inlet pipe and outlet pipe; The inlet pipe and the outlet pipe are respectively located at both ends of the main board; The water inlet pipe has an outlet on the side facing the motherboard, and the water collection pipe has two or more water collection holes on the side connected to the motherboard. Wastewater is suitable for flowing out from the outlet of the water inlet pipe onto the motherboard and into the water collection holes of the water collection pipe. An overflow groove is provided between the water inlet pipe and the main board, and the opening of the overflow groove faces the side where the water flows.

2. The evaporation plate for flue gas evaporation wastewater according to claim 1, characterized in that, The inlet pipe has openings at both ends, and the outlet is located on the side wall of the inlet pipe and extends along the length of the inlet pipe.

3. The evaporation plate for flue gas evaporation wastewater according to claim 1, characterized in that, The side of the water collection pipe with the water collection hole is located in the same plane as the top surface of the main board.

4. The evaporation plate for flue gas evaporation wastewater according to claim 1, characterized in that, Two or more water collection holes are arranged in an array.

5. The evaporation plate for flue gas evaporation wastewater according to claim 1, characterized in that, The water collection pipe is equipped with a baffle; the baffle is located on one side of the water collection hole.

6. The evaporation plate for flue gas evaporation wastewater according to claim 5, characterized in that, The baffle is provided with a support member; the support member is located on the side of the baffle away from the water collection hole.

7. The evaporation plate for flue gas evaporation wastewater according to claim 1, characterized in that, The end face of the overflow channel has a triangular structure.

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