Evaporation plate for waste water evaporation by flue gas

Abstract

The utility model 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] The present application relates to the technical field of wastewater desulfurization, and in particular to an evaporation plate for flue gas evaporation of wastewater. Background Art

[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 or destination for its reuse. It can only be achieved through reduction and evaporation drying technology to achieve zero emissions in order to meet the current environmental protection requirements for thermal power plants.

[0003] This method utilizes the heat from low-temperature flue gas to evaporate and concentrate the desulfurization wastewater, achieving pre-discharge treatment for the desulfurization wastewater. This method offers advantages such as a simple system, low investment and operating costs, and minimal maintenance. This method requires the low-temperature flue gas to come into contact with the desulfurization wastewater, removing moisture from the wastewater through flue gas convection. Therefore, developing a carrier to support the desulfurization wastewater and ensure sufficient contact between the low-temperature flue gas and the desulfurization wastewater is essential. Summary of the Invention

[0004] In view of this, the present 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 the present application, there is provided an evaporation plate for evaporating wastewater from flue gas, characterized in that it comprises: a main plate, a water inlet pipe and a water receiving pipe;

[0006] The water inlet pipe and the water receiving pipe are respectively arranged at the two ends of the main board;

[0007] The water inlet pipe is provided with a water outlet on the side facing the main board, and the water receiving pipe is provided with two or more water receiving holes on the side connected to the main board. Waste water is suitable for flowing out of the water outlet of the water inlet pipe to the main board and into the water receiving holes of the water receiving pipe.

[0008] 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 water flows.

[0009] In a possible implementation, both ends of the water inlet pipe are provided with openings, and the water outlet is provided on the side wall of the water inlet pipe and extends along the length direction of the water inlet pipe.

[0010] In a possible implementation, the side of the water collecting pipe where the water collecting hole is formed is located in the same plane as the top surface of the main board.

[0011] In a possible implementation, two or more water-collecting holes are arranged in an array.

[0012] In a possible implementation, the water receiving pipe is provided with a baffle; the baffle is arranged on one side of the water receiving hole.

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

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

[0015] Beneficial effects: The main board 100 is suitable for receiving wastewater and providing physical support for full contact between wastewater and low-temperature flue gas. The water inlet pipe 200 at one end of the main board 100 is suitable for introducing wastewater, and the water collecting pipe 300 at the other end of the main board 100 is suitable for discharging treated wastewater. The wastewater flows out from the water outlet 210 of the water inlet pipe 200 to the main board 100, and is spread flat on the main board 100 to form a water film, thereby increasing the water flow area and reducing the water flow thickness, so as to facilitate comprehensive and complete contact with the flue gas. The overall structure of this application is simple, which can not only ensure full contact between wastewater and flue gas and ensure the concentration effect of wastewater, but also reduce investment and operating costs, and meet the current environmental protection requirements for thermal power plants.

[0016] 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

[0017] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the application and, together with the description, serve to explain the principles of the application.

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

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

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

[0021] Figure 4 A partial diagram showing an evaporation plate for evaporating wastewater from flue gas according to an embodiment of the present application;

[0022] Figure 5 A partial diagram showing an evaporation plate for evaporating wastewater from flue gas according to an embodiment of the present application;

[0023] Figure 6 A partial diagram showing an evaporation plate for evaporating wastewater from flue gas according to an embodiment of the present application;

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

[0025] 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 indicated.

[0026] 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 application or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0028] 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.

[0029] In addition, numerous specific details are provided in the detailed description below to better illustrate the present application. Those skilled in the art will appreciate that the present application can be practiced without certain specific details. In some instances, methods, means, components, and circuits well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present application.

[0030] Figure 1 The main structure diagram of the evaporation plate for flue gas evaporation wastewater in the embodiment of the present application is shown. Figure 1As shown, the evaporation plate for flue gas evaporation wastewater includes: a main board 100, a water inlet pipe 200 and a water receiving pipe 300; the water inlet pipe 200 and the water receiving pipe 300 are respectively arranged at both ends of the main board 100; the water inlet pipe 200 is provided with a water outlet 210 on the side facing the main board 100, and the water receiving pipe 300 is provided with two or more water receiving holes 310 on the side connected to the main board 100, and the wastewater is suitable for flowing out from the water outlet 210 of the water inlet pipe 200 to the main board 100 and flowing into the water receiving holes 310 of the water receiving pipe 300; an overflow groove 400 is provided between the water inlet pipe 200 and the main board 100, and the opening of the overflow groove 400 faces the side where water flows.

[0031] It should be noted here that the present application is applicable to installation in the flue between the outlet of the induced draft fan and the inlet of the desulfurization tower. The main board 100 is applicable to receiving wastewater and providing physical support for full contact between the wastewater and the low-temperature flue gas. The water inlet pipe 200 at one end of the main board 100 is applicable to introducing wastewater, and the water receiving pipe 300 at the other end of the main board 100 is applicable to discharging treated wastewater. The wastewater flows out from the water outlet 210 of the water inlet pipe 200 to the main board 100, and is spread flat on the main board 100 to form a water film, which increases the water flow area and reduces the water flow thickness, so as to facilitate comprehensive and complete contact with the flue gas. The treated wastewater falls into the water receiving pipe 300 from the water receiving hole 310, and finally flows back to the storage box from the water receiving pipe 300. The overflow trough 400 between the water inlet pipe 200 and the main board 100 acts as a buffer and decelerator. Wastewater first enters the overflow trough 400. When the overflow trough 400 is full of wastewater, the wastewater overflows the overflow trough 400 and is spread evenly onto the main board 100, ensuring a uniform thickness of the water film on the main board 100. The present application transports and distributes wastewater onto the main board 100. The wastewater comes into contact with the low-temperature hot flue gas on the main board 100, and the convection of the flue gas removes the water in the wastewater, achieving wastewater concentration and reduction. The present application has a simple overall structure, which not only ensures sufficient contact between the wastewater and the flue gas, ensuring the wastewater concentration effect, but also reduces investment and operating costs, meeting the current environmental protection requirements for thermal power plants.

[0032] In one possible implementation, the main body of the main board 100 is a rectangular plate-like structure, and one side of the length of the water inlet pipe 200 and one side of the length of the water receiving pipe 300 are respectively located on both sides of the width of the main board 100, so that the wastewater flows along the length direction of the main board 100 to increase the flow path of the wastewater, increase the contact time with the flue gas, and further ensure the treatment effect of the wastewater.

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

[0034] Furthermore, the length L2 of the mainboard 100 ranges from 3 to 6 meters; the width L4 of the mainboard 100 ranges from 1 to 2 meters; the thickness L3 of the mainboard 100 ranges from 5 to 8 millimeters; and the surface roughness of the mainboard 100 ranges from Ra ≤ 2.5 μm.

[0035] In a possible implementation, both ends of the water inlet pipe 200 are provided with openings, the length side of the water inlet pipe 200 is connected to the width side of the main board 100, and the water outlet 210 is opened 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, the main body of the water inlet pipe 200 is a tubular structure with openings at both ends. A water outlet 210 is provided on the side wall of the water inlet pipe 200. The water outlet 210 is a flat structure and passes through the side wall of the water inlet pipe 200. The setting of the flat structure is conducive to slowing down the speed of wastewater in the water inlet pipe 200 when passing through the water outlet 210, and forming a water flow of a corresponding structure to adapt to the main board 100.

[0036] Furthermore, the length of the water inlet pipe 200 is the same as the width L4 of the main board 100, and the outlet 210 of the water inlet pipe 200 is connected to the main board 100 on one side and the outlet 210 is located above the main board 100 so that the waste water can be retained on the top surface of the main board 100. Figure 3 As shown, 5% of the overall length L1 of the evaporation plate for evaporating wastewater from flue gas is ≤ the overall width L5 of the water inlet pipe 200 ≤ 10% of the overall length L1 of the evaporation plate for evaporating wastewater from flue gas. Preferably, the overall width L5 of the water inlet pipe 200 is 5.4% of the overall length L1 of the evaporation plate for evaporating wastewater from flue gas. The height of the water outlet 210 of the water inlet pipe 200 ranges from 10 to 50 mm.

[0037] Further, such as Figure 4 As shown, the water inlet pipe 200 is a tubular structure formed by bending a plate-like structure, with an overall teardrop-shaped cross-section. The bend of the water inlet pipe 200 is a semicircular structure, and the range of its diameter d1 is: 40% of the overall width L5 of the water inlet pipe 200 ≤ d1 ≤ 50% of the overall width L5 of the water inlet pipe 200; 1 / 2 of the overall width L5 of the water inlet pipe 200 ≤ the width of the bent portion L10 ≤ the overall width L5 of the water inlet pipe 200.

[0038] In one possible implementation, the main body of the water collecting pipe 300 is a tubular structure with openings at both ends. The side wall of the water collecting pipe 300 is provided with multiple water collecting holes 310, and the multiple water collecting holes 310 all penetrate the outer wall of the water collecting pipe 300. The treated wastewater can flow into the water collecting pipe 300 through the multiple water collecting holes 310.

[0039] In one possible implementation, the side of the water collection pipe 300 where the water collection hole 310 is located is coplanar with the top surface of the main board 100 to improve wastewater flow efficiency and prevent wastewater from accumulating at the connection between the water collection pipe 300 and the main board 100. Furthermore, 9% of the overall length L1 of the evaporation plate for flue gas evaporation wastewater is ≤ 12% of the overall length L1 of the evaporation plate for flue gas evaporation 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 evaporation wastewater.

[0040] like Figure 5 As shown, the water collecting pipe 300 is also a tubular structure formed by bending a plate structure, and its overall cross-section is a teardrop-shaped structure. The bend of the water collecting pipe 300 is a semicircular structure, and its diameter d2 is 30% of the overall width L6 of the water collecting pipe 300.

[0041] Preferably, the water collecting pipe 300 and the main board 100 are integrally formed.

[0042] In a possible implementation, two or more water collection holes 310 are arranged in an array. Figure 6 As shown, further, the total area of ​​all the water receiving 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 columns of water-collecting holes 310 in total, and the vertical distance L13 between any two adjacent columns of water-collecting holes 310 is 43 mm; the distance L12 between any two adjacent water-collecting holes 310 in each column is 25 mm.

[0044] like Figure 6 As shown, each water receiving hole 310 is a circular hole structure, the diameter of each water receiving hole 310 is the same, and the diameter of each water receiving hole 310 ranges from 25 to 35 mm; the preferred diameter range of the water receiving hole 310 is 30 mm.

[0045] In one possible implementation, the water collecting pipe 300 is provided with a baffle 500, which is disposed on one side of the water collecting holes 310. As shown in the figure, the baffle 500 is disposed on the side of all the water collecting holes 310 away from the main board 100. To prevent the high flow rate of wastewater on the main board 100 from rushing out of the water collecting pipe 300, the baffle 500 is provided to block the wastewater, allowing all wastewater to flow through the water collecting holes 310 and into the interior of the water collecting pipe 300.

[0046] Furthermore, the main body of the baffle 500 is a rectangular plate-shaped structure, 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, such as Figure 5 As shown, the height L11 of the baffle 500 ranges from 140 mm to 200 mm. Preferably, the height L11 of the baffle 500 is 150 mm.

[0048] In one possible implementation, the baffle 500 is provided with a support member 510; the support member 510 is disposed on the side of the baffle 500 facing away from the water receiving hole 310. It should be noted that to prevent the baffle 500 from tipping over due to excessive water flow, the support member 510 is disposed on the side of the baffle 500 facing away from the main board 100, thereby improving the placement stability of the baffle 500.

[0049] In a possible implementation, there are more than two support members 510, and the two or more support members 510 are arranged in sequence along the length direction of the baffle 500, and the distance L8 between each two adjacent support members 510 is the same. Figure 3 As shown, the distance L8 between each two adjacent support members 510 is 200 mm.

[0050] Furthermore, the main body of the support member 510 is a triangular plate-shaped structure, one side of which is connected to the baffle 500 and the other side is connected to the outer wall of the water collecting pipe 300 .

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

[0052] Furthermore, the end face of the overflow groove is a right triangle structure, wherein the angle a between the plane where the overflow groove is connected to the main board 100 and the plane where the main board 100 is located is 90 degrees; the angle b between the two side walls of the overflow groove is in the range of 15-45 degrees.

[0053] Preferably, both ends of the opening of the overflow trough 400 are integrally formed with the main board 100 and the water inlet pipe 200 respectively.

[0054] In summary, the most preferred ratio of the overall width L5 of the water inlet pipe 200, the opening width L7 of the overflow trough 400, the length L2 of the main board 100 and the overall width L6 of the water receiving pipe 300 is: 362.5:200:4189:522.5.

[0055] The overall material of this application is 2205 alloy which is resistant to chloride ion corrosion.

[0056] like Figure 7 As shown, this is a working diagram of the present application. A flue device is provided between the induced draft fan outlet and the desulfurization tower inlet, and a plurality of flues are provided inside the flue device. Each flue gas evaporation wastewater evaporation plate has a certain tilt angle and is arranged in the flue 600, and the height of the water collecting pipe 300 is lower than the height of the water inlet pipe 200. Preferably, the tilt angle of the flue gas evaporation wastewater evaporation plate is ≥15°, so that the wastewater can flow better from the water inlet pipe 200 to the water collecting pipe 300. The flow direction of the flue gas blown out by the induced draft fan is opposite to the flow direction of the wastewater, so that the flue gas can better produce impact contact with the wastewater. Since the two ends of the flue are connected to the induced draft fan and the desulfurization tower respectively, the flue gas absorbs the water vapor in the wastewater in this application and then enters the desulfurization tower, which is equivalent to replenishing the unsaturated flue gas with water vapor in advance. The desulfurization tower needs to further desulfurize the flue gas.

[0057] It should be further explained that both sides of the flue gas evaporation wastewater evaporation plate are tightly fitted against the inner wall of the flue 600 to form a wastewater flow channel, ensuring that wastewater flows only on the top surface of the flue gas evaporation wastewater evaporation plate and does not overflow from the sides. An external wastewater pipe penetrates the side wall of the flue 600 and is inserted into one end of the water inlet pipe 200. Wastewater in the wastewater pipe flows into the water inlet pipe 200 and flows out of the water outlet 210 onto the main board 100. Another external wastewater pipe penetrates the side wall of the flue 600 and is inserted into one end of the water collection pipe 300. Wastewater treated by the low-temperature flue gas enters the water collection pipe 300 and flows out of the wastewater pipe to the storage tank for the next concentration process.

[0058] The embodiments of the present application have been described above. The above description is illustrative and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. An evaporation plate for flue gas evaporation wastewater, characterized in that: include: Main board, water inlet pipe and water receiving pipe; The water inlet pipe and the water receiving pipe are respectively arranged at two ends of the main board; The water inlet pipe is provided with a water outlet on the side facing the main board, and the water receiving pipe is provided with two or more water receiving holes on the side connected to the main board, and waste water is suitable for flowing out of the water outlet of the water inlet pipe to the main board and into the water receiving holes of the water receiving 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 water flows.

2. The evaporation plate for flue gas evaporation wastewater according to claim 1, characterized in that: Both ends of the water inlet pipe are provided with openings, and the water outlet is opened on the side wall of the water inlet pipe and extends along the length direction of the water inlet pipe.

3. The evaporation plate for flue gas evaporation wastewater according to claim 1, characterized in that: The side of the water collecting pipe where the water collecting hole is opened 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 collecting pipe is provided with a baffle; the baffle is arranged on one side of the water collecting 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 arranged on a side of the baffle away from the water receiving hole.

7. The evaporation plate for flue gas evaporation wastewater according to claim 1, characterized in that: The end surface of the overflow trough is in a triangular structure.

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