Multi-effect evaporation device for concentrated water treatment of thermal power plant

Abstract

The utility model discloses a multi-effect evaporation device for concentrated water treatment of a thermal power plant. The multi-effect evaporation device comprises an evaporation tank body and a water inlet pipe group, a water distribution pipe is arranged at the top of the inner cavity of the evaporation tank body; the water inlet pipe group comprises a main pipe, an upper water distribution inlet pipe, an inner water distribution pipe and a rotational flow water pipe; the middle lower part of the evaporation tank body is in a circular truncated cone shape with a wide upper part and a narrow lower part, a plurality of rotational flow water pipes tangent to the side surface of the evaporation tank body are arranged on the side surface of the evaporation tank body, and a water outlet of the evaporation tank body is connected to the solid-liquid separation unit. Flowing water flow is formed on the inner wall of the evaporator through the upper water distribution pipe, and rotational flow along the inner wall is formed in the evaporator through the rotational flow water pipe and water flow flowing in along the tangent line, so that accumulation of salt scales on the surface of the evaporator can be reduced, the frequency of cleaning the interior of the evaporator is reduced, no movable part is arranged in related parts, and the cost is reduced. And the reliability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of evaporators, in particular to a multi-effect evaporation device for concentrated water treatment in a thermal power plant. Background Art

[0002] The evaporator is a commonly used wastewater reduction device. Based on energy-saving considerations, the multi-effect evaporator is widely used, generally with three effects. It makes full use of the secondary steam generated by the front evaporator as the heat source of the subsequent evaporator, thereby improving energy consumption. During evaporation reduction, substances in the wastewater will precipitate and crystallize, and easily adhere to the inside of the evaporator. If not handled in time, it will cause the evaporator to become blocked and the efficiency to decrease in severe cases. In response to this problem, patent CN210117254U, a high-salt wastewater multi-effect evaporation crystallization device, discloses a treatment solution, which physically treats the precipitated and crystallized scale and salt scale by setting a scraper device driven by a hydraulic telescopic rod in the crystallizer. However, its treatment components are all arranged inside the evaporator. When used for a long time, salt scale will also appear on the surface of the relevant moving parts, affecting its cleaning efficiency, and in severe cases, causing the device to fail. Utility Model Content

[0003] The utility model aims to provide a multi-effect evaporation device for concentrated water treatment in a thermal power plant to solve the problems existing in the prior art.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the utility model provides a multi-effect evaporation device for concentrated water treatment in a thermal power plant, comprising an evaporation tank body and a water inlet pipe group; the evaporation tank body is a rotating body with a hollow interior, a steam outlet is arranged at the upper part, a water outlet is arranged at the lower part, and a water distribution pipe is arranged at the top of the inner cavity; the water inlet pipe group comprises a main pipe, an upper water distribution inlet pipe, an inner water distribution pipe, and a swirl water pipe; the main pipe passes through the side wall of the evaporation tank body and is connected to the inner water distribution pipe arranged in the middle of the evaporation tank body, one end of the upper water distribution inlet pipe is connected to the main pipe, and the other end passes through the side wall of the evaporation tank body and is connected to the water distribution pipe; the middle and lower part of the evaporation tank body is a truncated cone with a wide top and a narrow bottom, and a plurality of swirl water pipes tangent to the side thereof are arranged on its side, the other end of the swirl water pipe passes through the side wall of the evaporation tank body and is connected to the inner cavity, and the other end is connected to the main pipe through a booster pump.

[0005] Preferably, the water distribution pipe includes an annular tube and an annular water guiding slope. The annular tube is arranged at the top of the inner cavity of the evaporator tank body, and its outer diameter is smaller than the inner diameter of the top of the inner cavity of the evaporator tank body. The annular water guiding slope is arranged below the annular tube, inclinedly arranged, and has a lower height close to the inner cavity of the evaporator tank body; and a groove pointing to the annular water guiding slope is provided on the annular tube.

[0006] Preferably, there are multiple vortex water pipes, which are arranged up and down or relatively, wherein the relatively arranged ones have opposite inclination directions.

[0007] Preferably, the multiple-effect evaporation device further comprises a solid-liquid separation unit, the water outlet of the evaporation tank body is connected to the solid-liquid separation unit, the solid-liquid separation unit comprises a concentrated water storage tank, and the concentrated water storage tank is an internally hollow rotating body, a necking section is arranged at the upper part, and a water outlet is arranged at the lower part.

[0008] Preferably, the solid-liquid separation unit further comprises a separation box, the outlet at the lower part of the concentrated water storage tank is connected to the separation box via a pipeline, and a valve that can be opened and closed is provided on the pipeline; the pipeline is arranged obliquely, the height of the side close to the separation box is lower, and the end of the pipeline extends into the interior of the separation box; the separation box comprises two parallel wide side walls, and the distance between the two wide side walls is equal to or slightly larger than the diameter of the pipeline; the proximal upper narrow side wall of the connection between the pipeline and the separation box is arranged in a vertical direction, and the distal upper narrow side wall opposite to the proximal upper narrow side wall is arranged in a vertical direction. The proximal lower narrow side wall below the proximal upper narrow side wall is inclined and the lower part is inclined away from the proximal upper narrow side wall, the distal lower narrow side wall below the distal upper narrow side wall is inclined and the lower part is inclined toward the proximal upper narrow side wall, the proximal lower narrow side wall and the distal lower narrow side wall are connected at the bottom by a horizontal bottom wall, and the horizontal bottom wall is provided with a concentrated water outlet; the proximal upper narrow side wall and the upper part of the distal upper narrow side wall are connected by a top wall, and a downward arc-shaped protrusion is provided on the side of the top wall close to the proximal upper narrow side wall.

[0009] Preferably, a first circular tube is arranged inside the separation box near the pipeline extension port area, the first circle is located below the arc-shaped protrusion, and gaps are arranged between the arc-shaped protrusion and the proximal upper narrow side wall and / or the proximal lower narrow side wall, and the pipeline axis is located in the area between the center of the first circular tube and the arc-shaped protrusion.

[0010] Preferably, a second circular tube is arranged between the arc-shaped protrusion and the water outlet pipe inside the separation box, and a gap is arranged between the second circular tube, the arc-shaped protrusion and the upper narrow side wall at the distal end and / or the lower narrow side wall at the distal end, and the top height is higher than the top height of the first circular tube and the bottom height of the arc-shaped protrusion.

[0011] The utility model can form a flowing water flow on the inner wall of the evaporator by providing an upper water distribution pipe, and a swirl water pipe is provided at the lower part of the evaporator, and the water flowing in along the tangent line forms a swirl along the inner wall inside the evaporator, which can reduce the accumulation of salt scale on the surface, reduce the frequency of cleaning the inside of the evaporator, and no moving parts are provided in the related components, so the reliability is high. In view of the generated salt scale, a solid-liquid separation unit is provided, and the separation of larger particle salt scale and impurities from concentrated water is achieved through weight difference and water flow, which is conducive to optimizing the subsequent filtration process and reducing the consumption of consumables or the cleaning frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1It is a schematic diagram of the overall solution of the utility model.

[0013] Figure 2 It is a schematic diagram of the upper cutaway surface of the utility model.

[0014] Figure 3 It is an enlarged schematic diagram of the water distribution pipe area of ​​the utility model.

[0015] Figure 4 It is a schematic diagram of the solid-liquid separation unit of the utility model. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] As attached Figure 1-4 As shown, a multi-effect evaporation device for concentrated water treatment in a thermal power plant according to the utility model comprises an evaporation tank body 1 , a water inlet pipe group 2 , and a solid-liquid separation unit 3 .

[0018] The evaporation tank body 1 is a hollow rotating body, with a steam outlet 11 at the top and a water outlet 12 at the bottom.

[0019] The water inlet pipe group 2 includes a main pipe 21 , an upper water distribution inlet pipe 22 , an inner water distribution pipe 23 , and a swirl water pipe 24 .

[0020] The main pipe 21 passes through the side wall of the evaporation tank body 1 and is connected to an inner water pipe 23 disposed in the middle of the evaporation tank body 1 . The inner water pipe 23 is provided with a downward opening.

[0021] One end of the upper water distribution inlet pipe 22 is connected to the main pipe 21 , and the other end passes through the side wall of the evaporation tank body 1 and is connected to the water distribution pipe 13 arranged on the top of the evaporation tank body 1 .

[0022] The water distribution pipe 13 includes an annular pipe 131 and an annular water guide slope 132. The annular pipe 131 is arranged at the top of the inner cavity of the evaporation tank body 1, and its outer diameter is slightly smaller than the inner diameter of the top of the inner cavity of the evaporation tank body 1. The annular water guide slope 132 is arranged below the annular pipe 131, and is arranged obliquely, and its height is lower on the side close to the inner cavity of the evaporation tank body 1. The annular pipe 131 is provided with a groove pointing to the annular water guide slope 132. Water flows through the main pipe 21, the upper water distribution inlet pipe 22, and the groove of the annular pipe 131 into the annular water guide slope 132, and then flows to the inner wall of the evaporation tank body 1, forming a flowing water flow on the inner wall of the evaporation tank body 1, which can reduce the accumulation of salt scale.

[0023] The lower middle part of the evaporation tank body 1 is in the shape of a truncated cone with a wide top and a narrow bottom. A plurality of swirl water pipes 24 tangent to the side surface are arranged on the side surface of the evaporation tank body 1. The other end of the swirl water pipe 24 passes through the side wall of the evaporation tank body 1 and is connected to the inner cavity. The other end is connected to the main pipe 21 through the booster pump 241.

[0024] There is one vortex water pipe 24 in the figure, but there may be more than one vortex water pipe, which may be arranged up and down or opposite to each other, wherein the relative arrangement has opposite inclination directions.

[0025] Through the cyclone water pipe 24 and the frustum-shaped structure in the lower middle part of the evaporation tank body 1, a cyclone can be formed inside, and the accumulation of salt scale can also be reduced.

[0026] As attached Figure 3 As shown in FIG. 4 , the water outlet 12 of the evaporation tank body 1 is connected to the solid-liquid separation unit 3, and the solid-liquid separation unit 3 includes a concentrated water storage tank 31 and a separation box 32. The concentrated water storage tank 31 is a hollow rotating body with a necking section provided at the upper part, that is, the upper part has a smaller diameter than the lower part. Under the action of the vortex of the evaporation tank body 1, salt scale easily enters the concentrated water storage tank 31, and because the concentrated water storage tank 31 is small in size, salt scale is also easily accumulated there during the evaporation process.

[0027] The concentrated water storage tank 31 is provided with a water outlet at the bottom thereof, and is connected to the separation box 32 via a pipeline 33 , and an openable and closable valve may be provided on the pipeline.

[0028] The separation box 32 is an irregular box structure, and includes two parallel wide side walls 321 (in order to clearly illustrate the internal structure, the box wall close to the paper surface is not drawn in the attached figure), and the distance between the two wide side walls is equal to or slightly larger than the diameter of the pipe 33 (the distance between the two sides and the outer side surface of the pipe is 1-3 cm).

[0029] The pipeline 33 is arranged obliquely, with a lower height on the side close to the separation box 32 , and an end of the pipeline 33 extends into the interior of the separation box 32 .

[0030] The proximal upper narrow side wall 322 of the connection between the pipeline 33 and the separation box 32 is arranged vertically, and the distal upper narrow side wall 323 opposite to the proximal upper narrow side wall 322 is also arranged vertically and connected with a water outlet pipe 324.

[0031] The proximal lower narrow side wall 325 below the proximal upper narrow side wall 322 is arranged obliquely and its lower portion is inclined away from the proximal upper narrow side wall 322, the distal lower narrow side wall 326 below the distal upper narrow side wall 323 is arranged obliquely and its lower portion is inclined toward the proximal upper narrow side wall 322, and the bottoms of the proximal lower narrow side wall 325 and the distal lower narrow side wall 326 are connected by a horizontal bottom wall 327. A concentrated water outlet 328 is provided on the horizontal bottom wall 327.

[0032] The upper parts of the proximal upper narrow side wall 322 and the distal upper narrow side wall 323 are connected by a top wall 329 , and a downward arc-shaped protrusion 32 a is provided on the top wall 329 close to the proximal upper narrow side wall 322 .

[0033] The proximal upper narrow side wall 322 , the distal upper narrow side wall 323 , the proximal lower narrow side wall 325 , the distal lower narrow side wall 326 , the top wall 329 , the horizontal bottom wall 327 , together with the two wide side walls 321 , enclose the separation box 32 .

[0034] Inside the separation box 32, a first circular tube 32b is arranged near the entrance area of ​​the pipeline 33, and the first circular tube 32b is located below the arc-shaped protrusion 32a, and a gap is arranged between the arc-shaped protrusion 32a and the proximal upper narrow side wall 322 and / or the proximal lower narrow side wall 325, and the axis of the pipeline 33 is located in the area between the center of the first circular tube 32b and the arc-shaped protrusion 32a.

[0035] A second circular tube 32c is arranged between the arc-shaped protrusion 32a and the water outlet pipe 324 inside the separation box 32, and a gap is arranged between the second circular tube 32c, the arc-shaped protrusion 32a and the distal upper narrow side wall 323 and / or the distal lower narrow side wall 326, and the top height is higher than the top height of the first circular tube 32b and the bottom height of the arc-shaped protrusion 32a.

[0036] After concentrated water containing salt scale and impurities with high density flows into the separation box 32 through the concentrated water storage tank 31 and the pipeline 33, it will collide with the first circular tube 32b, the arc-shaped protrusion 32a, and the second circular tube 32c during the flow. During the flow and collision process, the heavier impurities will move downward, thereby achieving the separation of salt scale and impurities with high density. The separation process does not use a filter, which can reduce the consumption of subsequent consumables or the frequency of cleaning. The separated wastewater containing salt scale and impurities with high density can enter the sludge or solid waste treatment process.

[0037] It should be noted that, unless otherwise clearly specified and limited, the terms such as "install", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

Claims

1. A multiple-effect evaporator for concentrated water treatment in a thermal power plant, characterized in that: It comprises an evaporation tank body and a water inlet pipe group; the evaporation tank body is a rotating body with a hollow interior, a steam outlet is arranged at the upper part, a water outlet is arranged at the lower part, and a water distribution pipe is arranged at the top of the inner cavity; the water inlet pipe group comprises a main pipe, an upper water distribution inlet pipe, an inner water distribution pipe, and a swirl water pipe; the main pipe passes through the side wall of the evaporation tank body and is connected with the inner water distribution pipe arranged in the middle of the evaporation tank body, one end of the upper water distribution inlet pipe is connected with the main pipe, and the other end passes through the side wall of the evaporation tank body and is connected with the water distribution pipe; the middle and lower part of the evaporation tank body is a frustum with a wide top and a narrow bottom, and a plurality of swirl water pipes tangent to the side thereof are arranged on its side, the other end of the swirl water pipe passes through the side wall of the evaporation tank body and is connected with the inner cavity, and the other end is connected to the main pipe through a booster pump.

2. The multiple-effect evaporation device for treating concentrated water in a thermal power plant according to claim 1, characterized in that: The water distribution pipe includes an annular pipe and an annular water guiding slope. The annular pipe is arranged at the top of the inner cavity of the evaporator tank body, and its outer diameter is smaller than the inner diameter of the top of the inner cavity of the evaporator tank body. The annular water guiding slope is arranged below the annular pipe, tilted, and has a lower height close to the inner cavity of the evaporator tank body. The annular pipe is provided with a groove pointing to the annular water guiding slope.

3. The multiple-effect evaporation device for treating concentrated water in a thermal power plant according to claim 1, characterized in that: There are multiple vortex water pipes, which are arranged up and down or relatively, wherein the relatively arranged ones have opposite inclination directions.

4. The multiple-effect evaporation device for treating concentrated water in a thermal power plant according to claim 1, characterized in that: The multiple-effect evaporation device also includes a solid-liquid separation unit, the water outlet of the evaporation tank body is connected to the solid-liquid separation unit, and the solid-liquid separation unit includes a concentrated water storage tank, which is a hollow rotating body with a neck section at the top and a water outlet at the bottom.

5. The multiple-effect evaporation device for treating concentrated water in a thermal power plant according to claim 4, characterized in that: The solid-liquid separation unit also includes a separation box. The water outlet at the lower part of the concentrated water storage tank is connected to the separation box through a pipeline, and a valve that can be opened and closed is provided on the pipeline. The pipeline is arranged obliquely, and the height of the side close to the separation box is lower, and its end extends into the separation box. The separation box includes two parallel wide side walls, and the distance between the two wide side walls is equal to or slightly larger than the diameter of the pipeline. The proximal upper narrow side wall of the connection between the pipeline and the separation box is arranged in a vertical direction, and the distal upper narrow side wall opposite to the proximal upper narrow side wall is arranged in a vertical direction. And it is connected with a water outlet pipe; the proximal lower narrow side wall below the proximal upper narrow side wall is arranged obliquely and the lower part is inclined away from the proximal upper narrow side wall, the distal lower narrow side wall below the distal upper narrow side wall is arranged obliquely and the lower part is inclined toward the proximal upper narrow side wall, the bottoms of the proximal lower narrow side wall and the distal lower narrow side wall are connected by a horizontal bottom wall, and the horizontal bottom wall is provided with a concentrated water outlet; the proximal upper narrow side wall and the upper part of the distal upper narrow side wall are connected by a top wall, and a downward arc-shaped protrusion is provided on the side of the top wall close to the proximal upper narrow side wall.

6. The multiple-effect evaporation device for treating concentrated water in a thermal power plant according to claim 5, characterized in that: Inside the separation box, a first circular tube is arranged near the pipeline extension port area, the first circle is located below the arc-shaped protrusion, and gaps are arranged between the arc-shaped protrusion and the proximal upper narrow side wall and / or the proximal lower narrow side wall, and the pipeline axis is located in the area between the center of the first circular tube and the arc-shaped protrusion.

7. The multiple-effect evaporation device for treating concentrated water in a thermal power plant according to claim 6, characterized in that: A second circular tube is arranged between the arc-shaped protrusion and the water outlet pipe inside the separation box, and gaps are arranged between the second circular tube, the arc-shaped protrusion and the upper narrow side wall and / or the lower narrow side wall at the distal end, and the top height is higher than the top height of the first circular tube and the bottom height of the arc-shaped protrusion.

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