Novel low-temperature economizer for improving top plate heat exchanger
By improving the structural design of the top plate heat exchanger, the problem of reduced heat exchange efficiency caused by the flow of heat medium water droplets into the lower gap was solved, achieving efficient heat medium water circulation and equipment stability, and improving the power plant's production efficiency.
Patent Information
- Application Number
- CN202520082197.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-14
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-01-14
AI Technical Summary
In existing top plate heat exchangers, condensed heat transfer fluid droplets flow into the gaps between the lower heat exchange plates, resulting in reduced heat exchange efficiency.
A novel low-temperature economizer for improving top plate heat exchangers was designed, including an inlet water header, an inlet water pipe, a top plate steam-water heat exchanger, an outlet water header, a wide-channel plate heat exchanger, a heat medium water tank, and a water collection trough. The circulation flow of the heat medium water is designed using inclined plates and density differences to prevent condensate droplets from flowing into the lower gaps. The water returns to the heat medium water tank through the water collection trough and downcomer, and is heated by capillary condensation film force.
It improved heat exchange efficiency, ensured the operational stability of the low-temperature economizer and the power plant's production efficiency, reduced the workload of workers connecting pipes, and achieved zero leakage of boiler condensate.
Smart Images
Figure CN223741298U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of low-temperature economizer technology, specifically a novel low-temperature economizer for improving top plate heat exchangers. Background Technology
[0002] Low-temperature economizers are devices that effectively save coal and improve boiler efficiency in the low-temperature range. They are mainly used in the medium-low temperature range at the outlet of the air preheater of large boilers in power plants and thermal power plants. By recovering the waste heat of flue gas to heat the boiler feedwater, they effectively reduce the thermal efficiency of the flue gas. Low-temperature economizers are usually installed on the tail flue at the outlet of the boiler air preheater. They can not only improve the efficiency of electrostatic precipitators and meet the requirements for low emissions, but also reduce power consumption and the size of downstream equipment. At the same time, they can remove most of the acidic gases.
[0003] Existing technologies often have the following drawbacks: In ordinary top plate heat exchangers, the heat transfer medium water condenses and descends along the heat exchange plates, but the condensed water droplets may flow into the gaps of the lower heat exchange plates, resulting in a reduction in heat exchange efficiency.
[0004] Therefore, this utility model provides a novel low-temperature economizer that improves the top plate heat exchanger. Utility Model Content
[0005] The purpose of this invention is to address the shortcomings of existing technologies where condensed heat transfer fluid droplets flow into the gaps of the lower heat exchange plates, causing a reduction in heat exchange efficiency. This invention proposes a novel low-temperature economizer to improve the performance of top plate heat exchangers.
[0006] To achieve the above objectives, this utility model adopts the following technical solution: a novel low-temperature economizer for improving top plate heat exchangers, comprising an inlet manifold and an inlet pipe, wherein the inlet pipe is connected to the inlet manifold, a top plate steam-water heat exchanger is connected to the other side of the inlet manifold, an outlet manifold is connected to the side of the top plate steam-water heat exchanger away from the inlet manifold, an outlet pipe is connected to the side of the outlet manifold away from the top plate steam-water heat exchanger, a plurality of plate heat exchange plates are installed inside the top plate steam-water heat exchanger, a wide channel plate heat exchanger is connected to one side of the top plate steam-water heat exchanger, a plurality of heat exchange plates are installed in the wide channel plate heat exchanger, a heat transfer medium tank is installed on the side of the wide channel plate heat exchanger away from the top plate steam-water heat exchanger, a water collection trough is connected to the surface of the top plate steam-water heat exchanger, a downcomer is connected to the surface of the water collection trough, and the downcomer is connected to the heat transfer medium tank.
[0007] The effect achieved by the above components is as follows: by setting the above structure, an improved top heat exchanger is achieved, which helps the condensed heat transfer medium water to drip down better, and the concave inclined plate also helps the water droplets to gather better, thereby achieving the goal of improving the power plant's production efficiency and economic benefits.
[0008] Preferably, the water collection trough is shaped like an inclined plane.
[0009] The effects achieved by the above components are: improving the water collection efficiency of the water collection tank, ensuring the operational stability of the low-temperature economizer equipment, and further contributing to improving the operating efficiency of the low-temperature economizer in coal-fired power plants.
[0010] Preferably, the plate heat exchange fins in the top plate steam-water heat exchanger are connected to the inclined surface of the water collection tank.
[0011] The effect achieved by the above components is that the top heat exchange plate is connected to the lower inclined plate, which plays a better role in guiding the flow during the condensation process and improves the circulation rate of the heat transfer medium.
[0012] Preferably, a ring is fixedly connected to the surface of the water inlet pipe, a support arm is fixedly connected to the arc surface of the ring, a threaded rod is threaded through the surface of the support arm, and an arc plate is rotatably connected to one end of the threaded rod.
[0013] The aforementioned components achieve the following effect: they facilitate the support of the transmission pipes on the boiler, thereby making it easier to connect the transmission pipes to the water inlet pipes, thus avoiding the need for workers to lift the pipes during connection and reducing the workload of workers.
[0014] Preferably, a round rod slides through the surface of the support arm, and one end of the round rod is fixedly connected to the arc-shaped plate.
[0015] The effect achieved by the above components is that when the arc plate moves, it will drive the round rod to move within the support arm. The support arm restricts the movement path of the round rod, thereby restricting the movement path of the arc plate and preventing the arc plate from rotating during movement.
[0016] Preferably, the surface of the arc-shaped plate is rotatably connected with a plurality of ball bearings.
[0017] The effect achieved by the above components is that the transmission pipe slides along the surface of the ball, and the ball rotates inside the arc plate with the help of the force of the transmission pipe's movement. The ball reduces the friction when the transmission pipe moves on the surface of the arc plate, thus facilitating the connection between the transmission pipe and the water inlet pipe.
[0018] In summary:
[0019] 1. In this utility model, the waste heat flue gas at the air preheater outlet passes through the heat exchange plates in the wide-channel plate heat exchanger, transferring the waste heat to the heat exchange plates. The heat medium is in a self-circulating system. After heat exchange in the wide-channel plate heat exchanger, the heat medium water becomes a steam-water mixture that rises until it becomes water vapor and enters the top header. The water vapor condenses after heat exchange with the top plate steam-water heat exchanger, becoming condensed water droplets. These droplets flow back through the inclined plate at the bottom of the top header to the water collection tank. Utilizing the density difference, the heat medium water in the water collection tank flows back to the heat medium water tank through the downcomer under gravity. The water in the heat medium water tank, utilizing the density difference between the downcomer and the hot plate, and simultaneously using the rising force of the hot plate bubbles and part of the capillary condensation film force, enters the heat exchange plate for heating. Thus, the heat medium water forms its own cycle, achieving an improved top heat exchanger. This helps the condensed heat medium water drip down better, and the concave inclined plate also helps the water droplets collect better, thereby improving the power plant's production efficiency and economic benefits. Attached Figure Description
[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0021] Figure 2 This is a cross-sectional structural diagram of the present invention;
[0022] Figure 3 This is a schematic diagram of the water inlet pipe of this utility model.
[0023] Legend: 1. Inlet pipe; 2. Inlet manifold; 3. Outlet pipe; 4. Outlet manifold; 5. Top plate heat exchanger; 6. Wide channel plate heat exchanger; 7. Heat medium tank; 8. Downcomer; 9. Water collection trough; 10. Ring; 11. Support arm; 12. Threaded rod; 13. Arc plate; 14. Round rod; 15. Ball bearing. Detailed Implementation
[0024] Reference Figure 1 As shown, this utility model provides a technical solution: a novel low-temperature economizer for improving top plate heat exchangers, including an inlet header 2 and an inlet pipe 1. By setting the above structure, an improved top heat exchanger is achieved, which helps the condensed heat transfer medium water to drip down better. The concave inclined plate also helps the water droplets to gather better, thereby achieving the purpose of improving the power plant's production efficiency and economic benefits.
[0025] Reference Figure 2 and Figure 3As shown in this embodiment: the inlet pipe 1 is connected to the inlet manifold 2; a top plate steam-water heat exchanger 5 is connected to the other side of the inlet manifold 2; an outlet manifold 4 is connected to the side of the top plate steam-water heat exchanger 5 away from the inlet manifold 2; an outlet pipe 3 is connected to the side of the outlet manifold 4 away from the top plate steam-water heat exchanger 5; several plate heat exchange plates are installed inside the top plate steam-water heat exchanger 5; a wide channel plate heat exchanger 6 is connected to one side of the top plate steam-water heat exchanger 5; several heat exchange plates are installed in the wide channel plate heat exchanger 6; a heat transfer medium tank 7 is installed on the side of the wide channel plate heat exchanger 6 away from the top plate steam-water heat exchanger 5; a water collection trough 9 is connected to the surface of the top plate steam-water heat exchanger 5; a downcomer 8 is connected to the surface of the water collection trough 9; and the downcomer 8 is connected to the heat transfer medium tank 7. The inclined shape of the water collection tank 9 improves its water collection efficiency, ensures the operational stability of the low-temperature economizer, and further contributes to improving the operating efficiency of the low-temperature economizer in coal-fired power plants. The plate heat exchange fins inside the top plate steam-water heat exchanger 5 are connected to the inclined surface of the water collection tank 9, and the top heat exchange fins are connected to the lower inclined plate, providing better flow guidance during condensation and increasing the circulation rate of the heat transfer medium. A ring 10 is fixedly connected to the surface of the inlet pipe 1, and a support arm 11 is fixedly connected to the arc surface of the ring 10. A threaded rod 12 is threaded through the surface of the support arm 11, and one end of the threaded rod 12 is rotatably connected to an arc-shaped plate 13. This facilitates the support of the transmission pipe on the boiler, making it easier to connect the transmission pipe to the inlet pipe 1. This avoids the need for workers to lift the pipe during connection, reducing the workload of workers. A round rod 14 slides through the surface of the support arm 11. One end of the round rod 14 is fixedly connected to the arc-shaped plate 13. When the arc-shaped plate 13 moves, it drives the round rod 14 to move within the support arm 11. The support arm 11 restricts the movement path of the round rod 14, thereby restricting the movement path of the arc-shaped plate 13 and preventing the arc-shaped plate 13 from rotating during movement. Several ball bearings 15 are rotatably connected to the surface of the arc-shaped plate 13. The transmission pipe slides along the surface of the ball bearings 15. The ball bearings 15 rotate within the arc-shaped plate 13 with the help of the force of the transmission pipe's movement. The ball bearings 15 reduce the friction of the transmission pipe when it moves on the surface of the arc-shaped plate 13, thus facilitating the connection of the transmission pipe to the water inlet pipe 1.
[0026] Working principle: The transmission pipe connecting the boiler to the water inlet pipe 1 is placed on the arc-shaped plate 13. The transmission pipe will adhere to the surface of the ball bearings 15 on the arc-shaped plate 13. Then, the threaded rod 12 is rotated. The rotation of the threaded rod 12 will cause it to move within the support arm 11 via the thread. The movement of the threaded rod 12 will drive the arc-shaped plate 13 to move away from the support arm 11. When the arc-shaped plate 13 moves, it will drive the round rod 14 to move within the support arm 11. The support arm 11 restricts the movement path of the round rod 14, thereby restricting the movement path of the arc-shaped plate 13, thus preventing the arc-shaped plate 13 from rotating during movement. The movement of the arc-shaped plate 13 will drive the transmission pipe to move. When the transmission pipe and the inlet of the water inlet pipe are at the same horizontal level, the transmission pipe is pushed, and the transmission pipe will slide along the surface of the ball bearings 15. The ball bearings 15 will rotate within the arc-shaped plate 13 with the force of the movement of the transmission pipe. The ball bearings 15 reduce the friction of the transmission pipe when it moves on the surface of the arc-shaped plate 13, thus facilitating the connection between the transmission pipe and the water inlet pipe 1. When the transmission pipe... After connecting to the inlet pipe 1, the waste heat flue gas from the air preheater outlet passes through the heat exchange plates in the wide-channel plate heat exchanger 6, transferring the waste heat to the heat exchange plates. The heat medium is in a self-circulating system. After heat exchange in the wide-channel plate heat exchanger 6, the heat medium water becomes a steam-water mixture and rises until it becomes water vapor, entering the top header. The water vapor condenses after heat exchange with the top plate steam-water heat exchanger 5, becoming condensed water droplets. These droplets flow back through the inclined plate at the bottom of the top header to the water collection tank 9. The heat medium water in the water collection tank 9 utilizes the density difference... The water in the downcomer 8 flows back to the heat medium tank 7 under gravity. The water in the heat medium tank 7 is heated by the density difference between the downcomer 8 and the hot plate, as well as by the rising force of the bubbles on the hot plate and the force of part of the capillary condensate film. Thus, the heat medium water forms its own cycle. After passing through the top plate steam-water heat exchanger 5, the boiler condensate is heated and returns directly to the condensate outlet pipe. Since the boiler condensate pipe does not come into contact with the flue gas and only exchanges heat with the top steam, there is no risk of leakage, and zero leakage of boiler condensate can be achieved.
[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
Claims
1. A novel low temperature economizer for improving the top plate heat exchanger, comprising a water inlet header (2) and a water inlet pipe (1), characterized in that: The water inlet pipeline (1) is communicated with the water inlet header tank (2), the other side of the water inlet header tank (2) is communicated with the top plate type steam-water heat exchanger (5), the side, away from the water inlet header tank (2), of the top plate type steam-water heat exchanger (5) is communicated with the water outlet header tank (4), the side, away from the top plate type steam-water heat exchanger (5), of the water outlet header tank (4) is communicated with the water outlet pipeline (3), a plurality of plate type heat exchange sheets are installed in the top plate type steam-water heat exchanger (5), the side of the top plate type steam-water heat exchanger (5) is communicated with the wide channel plate type heat exchanger (6), a plurality of heat exchange sheets are installed in the wide channel plate type heat exchanger (6), the side, away from the top plate type steam-water heat exchanger (5), of the wide channel plate type heat exchanger (6) is installed with the heat medium water tank (7), the surface of the top plate type steam-water heat exchanger (5) is communicated with the water collecting tank (9), the surface of the water collecting tank (9) is communicated with the downcomer (8), and the downcomer (8) is communicated with the heat medium water tank (7).
2. A novel low temperature economizer for improving the top plate heat exchanger according to claim 1, characterized in that: The water collecting tank (9) is in the shape of an inclined plane.
3. A novel low temperature economizer for improving the top plate heat exchanger according to claim 1, characterized in that: The plate type heat exchange sheets in the top plate type steam-water heat exchanger (5) are communicated with the inclined plane of the water collecting tank (9).
4. A novel low temperature economizer for improving the top plate heat exchanger according to claim 1, characterized in that: The surface of the water inlet pipeline (1) is fixedly connected with a circular ring (10), the arc surface of the circular ring (10) is fixedly connected with a support arm (11), the surface of the support arm (11) is threadedly penetrated by a threaded rod (12), and one end of the threaded rod (12) is rotatably connected with an arc-shaped plate (13).
5. A novel low temperature economizer for improving the top plate heat exchanger according to claim 4, characterized in that: The surface of the support arm (11) is slidably penetrated by a circular rod (14), and one end of the circular rod (14) is fixedly connected with the arc-shaped plate (13).
6. A novel low temperature economizer for improving the top plate heat exchanger according to claim 4, characterized in that: The surface of the arc-shaped plate (13) is rotatably connected with a plurality of ball bearings (15).