Fixed discharge pit for waste heat boiler

Abstract

The utility model relates to the technical field, and discloses a fixed drainage pit for a waste heat boiler, which comprises a fixed drainage pit body, a main drainage pump and at least two turbulent flow walls, and the main drainage pump is arranged in the fixed drainage pit body; an accumulated water collecting pit is defined in the fixed drainage pit body, a water inlet and a water outlet are formed in the side wall of the fixed drainage pit body at intervals and communicated with the accumulated water collecting pit, the main drainage pump is arranged close to the water outlet, and the at least two turbulent flow walls are arranged on the two opposite sides of the accumulated water collecting pit in a staggered mode at intervals. One side of each turbulent flow wall is fixedly connected with the inner side wall of the fixed drainage pit body, a gap is reserved between the other side of each turbulent flow wall and the inner side wall of the fixed drainage pit body, the turbulent flow walls are perpendicular to the ground, the accumulated water collecting pit is limited by the at least two turbulent flow walls to form an S-shaped flow channel, and the water inlet and the water outlet are communicated with the two ends of the flow channel respectively; the mixing path of hot sewage and cooling water can be effectively prolonged, and the mixing efficiency is improved.

Description

Technical Field

[0001] The technical field of this utility model specifically relates to a fixed discharge pit for a waste heat boiler. Background Technology

[0002] Waste heat boiler scheduled blowdown, also known as periodic blowdown, generates hot wastewater containing impurities, sediment, and high salinity during startup and operation, with a temperature approaching 100°C. Due to discharge requirements, a large amount of cooling water must be injected to reduce its temperature to below 60°C before it can be discharged into the water treatment system. Therefore, the hot wastewater and cooling water must enter the waste heat boiler scheduled blowdown pit together for temperature mixing, and then be discharged after the temperature drops to the required level.

[0003] The existing waste heat boiler's blowdown pit is typically a simple hollow water tank structure. Hot wastewater and cooling water are injected from one end, cooled by settling, and then discharged from the other end via a blowdown pump. However, this structure has many drawbacks. The hot wastewater and cooling water mix naturally within the blowdown pit, resulting in an extremely slow mixing process. In dry, low-temperature conditions such as winter, hot steam is easily released, negatively impacting the surrounding environment. Furthermore, during the high-flow blowdown phase of the waste heat boiler startup, the blowdown pump in the blowdown pit needs to run continuously. At this time, the hot wastewater and cooling water flow in a straight line towards the pump after entering the pit. The short flow path and minimal mixing time result in laminar flow, leading to insufficient mixing. This causes both hot and cold water to be simultaneously drawn into the blowdown pump, easily causing pump malfunctions, increasing equipment maintenance costs and operational risks, and severely affecting the stable and efficient operation of the waste heat boiler's blowdown system. Utility Model Content

[0004] The purpose of this invention is to provide a fixed discharge pit for waste heat boilers, which improves the mixing efficiency of hot wastewater and cooling water and ensures thorough mixing, making it suitable for high-flow-rate blowdown conditions of waste heat boilers.

[0005] To achieve the above objectives, this application provides a fixed discharge pit for a waste heat boiler, comprising: a fixed discharge pit body, a main drainage pump, and at least two baffle walls.

[0006] The main drainage pump is installed inside the fixed drainage pit body;

[0007] The interior of the fixed drainage pit body defines a water collection pit. The side wall of the fixed drainage pit body is provided with an inlet and an outlet at intervals. The inlet and the outlet are respectively connected to the water collection pit. The main drainage pump is located near the outlet. At least two baffle walls are arranged at intervals and staggered on opposite sides of the water collection pit. One side of the baffle wall is fixedly connected to the inner side wall of the fixed drainage pit body, and the other side of the baffle wall is separated from the inner side wall of the fixed drainage pit body. The baffle walls are set perpendicular to the ground. The at least two baffle walls define the water collection pit into an S-shaped flow channel, and the inlet and the outlet are respectively connected to the two ends of the flow channel.

[0008] As a preferred technical solution, the fixed discharge pit for the waste heat boiler further includes a ladder and an inspection hole. The ladder is installed on the inner wall of the fixed discharge pit body and is perpendicular to the ground. The inspection hole is installed on the top or inner wall of the fixed discharge pit body and is corresponding to the ladder.

[0009] As a preferred technical solution, the top of the turbulence wall is flush with the top of the fixed drainage pit body.

[0010] As a preferred technical solution, multiple flow barriers are arranged sequentially at intervals along the length of the fixed drainage pit body, and the interval between two adjacent flow barriers is 25% of the length of the fixed drainage pit body.

[0011] As a preferred technical solution, the interval between two adjacent turbulence walls is 1000-1100mm.

[0012] As a preferred technical solution, the length of the turbulence wall is 55% of the width of the fixed drainage pit body.

[0013] As a preferred technical solution, the length of the baffle wall is 1700-1750mm.

[0014] As a preferred technical solution, the thickness of the turbulence wall is 60% of the wall thickness of the fixed drainage pit body.

[0015] As a preferred technical solution, the thickness of the baffle wall is 200mm.

[0016] As a preferred technical solution, the fixed discharge pit for the waste heat boiler further includes an auxiliary drainage pump, which is disposed separately from the main drainage pump within the fixed discharge pit body.

[0017] The above-described technical solution provides a fixed discharge pit for a waste heat boiler, which, compared with existing technologies, offers the following advantages:

[0018] 1. By setting up a baffle wall to form an "S" shaped path, this application can effectively extend the mixing path compared to a straight path, allowing hot wastewater and cooling water to have a longer mixing time in the fixed discharge pit, thereby improving the mixing efficiency.

[0019] 2. At the bend of the "S"-shaped path, the outer (concave bank) has a faster flow velocity and greater centrifugal force, causing the liquid level to rise; the inner (convex bank) has a slower flow velocity and less centrifugal force, causing the liquid level to drop, thus forming a transverse liquid level slope. Under the action of centrifugal force, a secondary circulation occurs on the cross-section of the curved path, which superimposes with the main flow to form a curved spiral flow structure, promoting the mixing of hot wastewater and cooling water. Attached Figure Description

[0020] The present application will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present application. Furthermore, unless specifically indicated, the drawings are intended only to conceptually represent the composition or structure of the described objects and may contain exaggerated representations, and the drawings are not necessarily drawn to scale.

[0021] Fig. 1 This is a schematic diagram of the structure of the fixed-row pit of this utility model;

[0022] Fig. 2 This is a schematic diagram of the workflow of the fixed-row pit of this utility model;

[0023] Fig. 3 This is a top view of the fixed-row pit of this utility model;

[0024] The components include: 1. Main drainage pit body; 11. Water collection pit; 12. Inlet; 13. Outlet; 2. Main drainage pump; 3. Auxiliary drainage pump; 4. Baffle wall; 5. Ladder; 6. Inspection hole. Detailed Implementation

[0025] Preferred embodiments of this application will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary, and should not be construed as limiting the scope of protection of this application.

[0026] First, it should be noted that the directions such as top, bottom, upward, and downward mentioned in this article are defined relative to the directions in the various accompanying figures. They are relative concepts and therefore can change depending on their different positions and practical applications. Therefore, these or other directions should not be interpreted as restrictive terms.

[0027] It should be noted that the term "comprising" does not exclude other elements or steps, and "a" or "an" does not exclude the plural.

[0028] Furthermore, it should be noted that any single technical feature described or implied in the embodiments herein, or any single technical feature shown or implied in the accompanying drawings, can still be combined among these technical features (or their equivalents) to obtain other embodiments of this application not directly mentioned herein.

[0029] It should also be understood that while the terms "first," "second," etc., are used in this document to describe various types of information, this information should not be limited to these terms, which are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0030] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0031] Please see Figs. 1-3 The present application provides a fixed discharge pit for a waste heat boiler, comprising: a fixed discharge pit body 1, a main drainage pump 2, and at least two baffle walls 4.

[0032] The main drainage pump 2 is installed inside the fixed drainage pit body 1;

[0033] The interior of the fixed drainage pit body 1 defines a water collection pit 11. The side wall of the fixed drainage pit body 1 is provided with an inlet 12 and an outlet 13 at intervals. The inlet 12 and the outlet 13 are respectively connected to the water collection pit 11. The main drainage pump 2 is set near the outlet 13. At least two baffle walls 4 are arranged at intervals and staggered on opposite sides of the water collection pit 11. One side of the baffle wall 4 is fixedly connected to the inner side wall of the fixed drainage pit body 1, and the other side of the baffle wall 4 is separated from the inner side wall of the fixed drainage pit body 1. The baffle wall 4 is set perpendicular to the ground. At least two baffle walls 4 define the water collection pit 11 into an S-shaped flow channel, and the inlet 12 and the outlet 13 are respectively connected to the two ends of the flow channel.

[0034] In this embodiment, the baffle wall 4 creates an "S"-shaped flow channel within the water collection pit 11. Hot wastewater and cooling water flow together into the water collection pit 11 from the inlet 12 and mix through the "S"-shaped flow channel. The cooled fluid, under the action of the drainage pump, flows out from the outlet 13. Compared to a straight flow channel, the "S"-shaped flow channel significantly increases the mixing path, effectively extending the fluid mixing time and improving mixing efficiency. Furthermore, secondary circulation occurs at the bends of the "S"-shaped flow channel, forming a bend-spiral flow structure that further enhances the degree of liquid mixing, ensuring thorough mixing. The fluid velocity slows down at the bends of the "S"-shaped flow channel, and it accumulates there, resulting in secondary mixing and further improving mixing efficiency.

[0035] Furthermore, the waste heat boiler's fixed discharge pit also includes a ladder 5 and an inspection hole 6. The ladder 5 is installed on the inner wall of the fixed discharge pit body 1 and is perpendicular to the ground. The inspection hole 6 is installed on the top or inner wall of the fixed discharge pit body 1, and is corresponding to the ladder 5. The ladder 5, installed on the inner wall of the fixed discharge pit body 1 and perpendicular to the ground, facilitates safe access for personnel to ascend and descend the fixed discharge pit. In this application, the ladder 5 extends from the top to the bottom of the pit. It is worth noting that a rest platform can be provided in the middle of the ladder 5 according to actual needs to facilitate personnel climbing. In this application, the inspection hole 6 is preferably located at the top of the fixed discharge pit body 1, facilitating personnel entry into the fixed discharge pit for inspection and maintenance.

[0036] Furthermore, the top of the turbulence wall 4 is flush with the top of the fixed discharge pit body 1. This ensures that the fluid always travels along the "S"-shaped flow channel during high-flow sewage discharge, guaranteeing a good mixing effect.

[0037] Furthermore, the interval between two adjacent turbulence walls 4 is 25% of the length of the fixed discharge pit body 1. This ratio is the optimal ratio obtained by the inventors through multiple experiments to ensure the curved shape of the "S"-shaped flow channel. On the one hand, the "S"-shaped flow channel, which ensures the curved shape, allows the fluid to generate more turbulence and disturbance during flow. This turbulence and disturbance can break the laminar flow state of the fluid, allowing the fluid in different areas to mix better and more evenly, avoiding local overheating or insufficient mixing. On the other hand, compared with some flow channels with sharp turns or right angle bends, the curve of the "S"-shaped flow channel is smoother, and the fluid flows more smoothly at the turning point, reducing eddies and energy losses caused by sharp turns, thereby reducing flow resistance, effectively reducing the energy consumption of the drainage pump, and lowering operating costs. Finally, the "S"-shaped flow channel can achieve a longer flow path in a limited space, making it better suited for some space-constrained situations. By rationally designing the shape and size of the "S"-shaped flow channel, the fluid flow requirements of the waste heat boiler's fixed discharge can be met without increasing the floor space or equipment volume excessively, thus improving space utilization.

[0038] It is worth noting that in this application, multiple flow barriers 4 are arranged sequentially at intervals along the length of the fixed drainage pit body 1, and the interval between two adjacent flow barriers 4 is 1000-1100mm.

[0039] Furthermore, the length of the turbulence wall 4 is 55% of the width of the fixed drainage pit body 1. This ratio is also the optimal ratio obtained by the inventors through multiple experiments, which can further ensure the curved shape of the "S"-shaped flow channel.

[0040] It is worth noting that the length of the turbulence wall 4 described in this application is 1700-1750 mm.

[0041] Furthermore, the thickness of the baffle wall 4 is 60% of the wall thickness of the fixed drainage pit body 1. On the one hand, this thickness allows the baffle wall 4 to withstand the impact and pressure of the fluid without deformation or damage, ensuring its structural integrity during long-term use and guaranteeing the safe operation of the entire system. On the other hand, this thickness allows the baffle wall 4 to produce the expected interference effect on the fluid flow. If the baffle wall 4 is too thin, it may not be able to sufficiently change the flow direction and velocity distribution of the fluid, making it difficult to form effective turbulence and failing to achieve the purpose of promoting fluid mixing; if the thickness is too large, it may lead to excessive flow resistance and increase system energy consumption.

[0042] It is worth noting that the thickness of the turbulence wall 4 described in this application is 200 mm.

[0043] Furthermore, the fixed drainage pit for the waste heat boiler also includes an auxiliary drainage pump 3, which is spaced apart from the main drainage pump 2 within the fixed drainage pit body 1. To improve the reliability of the drainage system, this application provides a standby drainage pump. When the main drainage pump 2 malfunctions or requires maintenance, the standby drainage pump can automatically start operation, ensuring that the water accumulated in the pit can be discharged in a timely manner without affecting the normal operation of the waste heat boiler.

[0044] In summary, the fixed discharge pit for waste heat boilers provided in this embodiment effectively increases the flow channel length by setting multiple baffle walls 4 at intervals and staggered inside the fixed discharge pit body 1 and optimizing the various dimensions of the baffle walls 4 to form an "S" shaped flow channel in the pit, thereby extending the fluid mixing time and forming a secondary flow at the bend of the flow channel, further ensuring that the hot wastewater and cooling water are fully mixed. It is suitable for the high-flow-rate blowdown conditions of waste heat boilers.

[0045] This specification discloses the present application with reference to the accompanying drawings and also enables those skilled in the art to implement the application, including making and using any device or system, employing suitable materials, and using any combination of methods. The scope of this application is defined by the claimed technical solution and includes other instances that would occur to those skilled in the art. Such other instances shall be considered to fall within the scope of protection defined by the claimed technical solution, provided that they include structural elements that are not different from the literal language of the claimed technical solution, or contain equivalent structural elements that are not substantially different from the literal language of the claimed technical solution.

Claims

1. A fixed discharge pit for a waste heat boiler, characterized in that, include: The main drainage sump, main drainage pump, and at least two baffle walls are included. The main drainage pump is installed inside the fixed drainage pit body; The interior of the fixed drainage pit body defines a water collection pit. The side wall of the fixed drainage pit body is provided with an inlet and an outlet at intervals. The inlet and the outlet are respectively connected to the water collection pit. The main drainage pump is located near the outlet. At least two baffle walls are arranged at intervals and staggered on opposite sides of the water collection pit. One side of the baffle wall is fixedly connected to the inner side wall of the fixed drainage pit body, and the other side of the baffle wall is separated from the inner side wall of the fixed drainage pit body. The baffle walls are set perpendicular to the ground. The at least two baffle walls define the water collection pit into an S-shaped flow channel, and the inlet and the outlet are respectively connected to the two ends of the flow channel.

2. The fixed discharge pit for a waste heat boiler according to claim 1, characterized in that, It also includes a ladder and an inspection hole. The ladder is installed on the inner wall of the fixed drainage pit body and is perpendicular to the ground. The inspection hole is installed on the top or inner wall of the fixed drainage pit body and is corresponding to the ladder.

3. The fixed discharge pit for a waste heat boiler according to claim 1, characterized in that, The top of the turbulence wall is flush with the top of the fixed drainage pit body.

4. The fixed discharge pit for a waste heat boiler according to claim 3, characterized in that, Multiple flow-dissipating walls are arranged sequentially at intervals along the length of the fixed drainage pit body, and the interval between two adjacent flow-dissipating walls is 25% of the length of the fixed drainage pit body.

5. The fixed discharge pit for a waste heat boiler according to claim 4, characterized in that, The distance between two adjacent turbulence walls is 1000-1100mm.

6. The fixed discharge pit for a waste heat boiler according to claim 5, characterized in that, The length of the turbulence wall is 55% of the width of the fixed drainage pit body.

7. The fixed discharge pit for a waste heat boiler according to claim 6, characterized in that, The length of the turbulence barrier is 1700-1750 mm.

8. The fixed discharge pit for a waste heat boiler according to claim 7, characterized in that, The thickness of the turbulence wall is 60% of the wall thickness of the fixed drainage pit body.

9. The fixed discharge pit for a waste heat boiler according to claim 8, characterized in that, The thickness of the turbulence barrier is 200mm.

10. The fixed discharge pit for a waste heat boiler according to claim 1, characterized in that, It also includes an auxiliary drainage pump, which is disposed at an interval from the main drainage pump within the fixed drainage pit body.

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