An economizer for a power plant

Abstract

The utility model discloses a coal economizer of power plant. It includes middle casing, and the inside fixed frame of middle casing, and the middle part interval fixed of frame has a plurality of guide vanes, and the side part interval of guide vane is equipped with a plurality of flow guide groove, and a plurality of flow guide groove all are along the horizontal setting of front and back direction, and the side interval of flow guide groove is equipped with water pipe, and the outside of water pipe is equipped with fin, and the front and back both ends of frame all are fixed with end plate, and both ends of guide vane all are connected with end plate, and both ends of water pipe are set respectively through end plate and are arranged at the outside of middle casing, and the outside of end plate is equipped with a plurality of connecting pipes, and both ends of water pipe are connected with connecting pipe respectively, and one end of connecting pipe is closed setting, and its other end is connected with water collecting box. The utility model discloses can make the flue gas when passing between flow guide groove and water pipe, can make flue gas as far as possible along the periphery of water pipe flow, and then improve the heat exchange efficiency of flue gas and water pipe.

Description

Technical Field

[0001] This utility model relates to the field of economizer technology for power plants, and specifically to an economizer for power plants. Background Technology

[0002] The economizer is a crucial component of a power plant's boiler system. It absorbs heat from the flue gas in the boiler flue, lowering the exhaust gas temperature. Simultaneously, it uses the flue gas to heat the water flowing inside the economizer. This heated water can then be reintroduced into the boiler, significantly reducing fuel consumption compared to directly adding cold water. The heat exchange efficiency between the water pipes and the flue gas is a key factor determining the economizer's efficiency. Currently, fins are typically installed on the outside of the water pipes to increase the contact area with the flue gas, thereby improving the heat exchange efficiency. However, because the flue gas flows longitudinally within the economizer, the effective contact area between the flue gas and the water pipes is limited, resulting in suboptimal heat exchange efficiency in existing economizers, necessitating improvement. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing an economizer for power plants.

[0004] To achieve the above objectives, this utility model provides an economizer for a power plant, comprising a middle shell, a frame fixed inside the middle shell, multiple guide plates fixed at intervals in the middle of the frame, multiple guide grooves at intervals on the sides of the guide plates, all of the multiple guide grooves being horizontally arranged in the front-back direction, water pipes at intervals on one side of the guide grooves, fins on the outer side of the water pipes, end plates fixed at both ends of the frame, both ends of the guide plates being connected to the end plates, both ends of the water pipes passing through the end plates and being disposed on the outer side of the middle shell, multiple connecting pipes being disposed on the outer side of the end plates, both ends of the water pipes being connected to the connecting pipes, one end of the connecting pipe being closed, and the other end being connected to a water collection tank.

[0005] Furthermore, the guide plates are arranged in pairs, and the guide grooves on the two guide plates in the same group are arranged opposite each other, with the water pipe positioned between the two opposite guide grooves.

[0006] Furthermore, the guide channel is arc-shaped and is concentrically arranged with the water pipe.

[0007] Furthermore, there are two water pipes between the two opposing guide channels, and the fins on the two water pipes are arranged in an alternating manner.

[0008] Furthermore, sealing plates are fixed to the lower sides of two adjacent, non-grouped guide vanes.

[0009] Furthermore, the cross-section of the sealing plate is V-shaped.

[0010] Furthermore, the cross-section of the middle shell is rectangular, and both its upper and lower ends are fixed to the deformable tube. The end of the deformable tube near the middle shell is rectangular, and the end away from the middle shell is round.

[0011] Furthermore, a connecting flange is fixed to the end of the deformable tube away from the middle shell.

[0012] Beneficial effects: This utility model fixes multiple guide plates on the frame and sets guide grooves on the guide plates. The guide plates are arranged in pairs, and the water pipes are arranged in pairs between a pair of guide grooves. This allows the flue gas to flow along the outer periphery of the water pipe as much as possible when passing between the guide groove and the water pipe, thereby improving the heat exchange efficiency between the flue gas and the water pipe. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the economizer in a power plant according to an embodiment of this utility model;

[0014] Figure 2 This is a schematic diagram of the internal structure of the economizer in a power plant according to an embodiment of the present invention;

[0015] Figure 3 yes Figure 2 A magnified schematic diagram of a portion of region A in the middle. Detailed Implementation

[0016] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. These embodiments are implemented under the premise of the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0017] like Figures 1 to 3As shown, this utility model embodiment provides an economizer for a power plant, including a middle shell 1, which is a rectangular frame with openings at both its front and rear ends. A frame 2 is fixed inside the middle shell 1, and the frame 2 can be inserted into the middle shell 1 through the openings and then fixed in place by multiple bolts. Multiple guide plates 3 are fixed at intervals in the middle of the frame 2, and multiple guide grooves 4 are spaced at intervals on the sides of the guide plates 3, all horizontally arranged in the front-rear direction. Water pipes 5 are spaced at intervals on one side of the guide grooves 4, and fins 6 are provided on the outer side of the water pipes 5, preferably spirally wound around the outer side of the water pipes 5. End plates 7 are fixed at both the front and rear ends of the frame 2, and the end plates 7 can close the openings. Both ends of the guide plates 3 are connected to the end plates 7, and the two ends of the guide plates 3 can be fixed to the end plates 7 by welding or bolts. Slots can be provided on the inner side of the end plates 7, and the two ends of the guide plates 3 can be inserted into the slots. Both ends of the water pipe 5 pass through the end plate 7 and are located on the outside of the middle shell 1. The water pipe 5 and the end plate 7 are sealed to prevent flue gas from leaking between them. Multiple connecting pipes 8 are provided on the outside of the end plate 7, and both ends of the water pipe 5 are connected to these connecting pipes 8. Preferably, the multiple connecting pipes 8 are arranged horizontally at intervals, so that all water pipes 5 at the same horizontal position are connected to their respective connecting pipes 8. One end of each connecting pipe 8 is closed, and the other end is connected to the water collection tank 9. One side of the water collection tank 9 can be connected to an external water inlet pipe via a flange. This water inlet pipe is connected to a water source via a water pump. Water in the water inlet pipe flows through the water collection tank 9 into each connecting pipe 8, and then into each water pipe 5 to be heated by the flue gas. The heated water then flows through the connecting pipe 8 on the other side into the water collection tank 9 on the other side. The other side of the water collection tank 9 is connected to an external water outlet pipe via a flange, and the water in the outlet pipe is finally transported into the boiler.

[0018] In this embodiment of the invention, the guide plates 3 are preferably arranged in pairs, with the guide grooves 4 on the two guide plates 3 in the same pair facing each other, and the water pipes 5 are arranged between the two facing guide grooves 4. Specifically, there are two water pipes 5 between the two facing guide grooves 4, and the fins 6 on the two water pipes 5 are staggered, so that the flue gas can pass through the area between the two water pipes 5 or through the area between the water pipes 5 and the guide plates 3. The guide grooves 4 are preferably arranged in an arc shape and are concentric with the water pipes 5.

[0019] To prevent some flue gas from entering the area between the two sets of guide vanes 3, thus hindering heat recovery from that portion of the flue gas, it is preferable to fix a sealing plate 10 on the lower side of two adjacent guide vanes 3 that are not in the same set. The cross-section of the sealing plate 10 is preferably set to a V-shape, which has a better diversion effect.

[0020] The cross-section of the inner shell 1 in this embodiment of the utility model is rectangular, and both its upper and lower ends are fixed to the deformable tube 11. The end of the deformable tube 11 near the inner shell 1 is rectangular, and the end away from the inner shell 1 is round. In order to facilitate connection with the flue, a connecting flange 12 is fixed at the end of the deformable tube 11 away from the inner shell 1.

[0021] The above description is merely a preferred embodiment of this utility model. It should be noted that for those skilled in the art, other parts not specifically described are existing technology or common knowledge. Several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. An economizer for a power plant, characterized in that, The device includes a middle shell, inside which a frame is fixed. Multiple guide plates are fixed at intervals in the middle of the frame. Multiple guide grooves are provided at intervals on the sides of the guide plates. The multiple guide grooves are all horizontally arranged in the front-back direction. Water pipes are provided at intervals on one side of the guide grooves. Fins are provided on the outside of the water pipes. End plates are fixed at both ends of the frame. Both ends of the guide plates are connected to the end plates. Both ends of the water pipes pass through the end plates and are located on the outside of the middle shell. Multiple connecting pipes are provided on the outside of the end plates. Both ends of the water pipes are connected to the connecting pipes. One end of each connecting pipe is closed, and the other end is connected to a water collection tank.

2. The economizer for a power plant according to claim 1, characterized in that, The guide plates are arranged in pairs, and the guide grooves on the two guide plates in the same group are arranged opposite each other. The water pipe is arranged between the two opposite guide grooves.

3. An economizer for a power plant according to claim 2, characterized in that, The guide channel is arc-shaped and is concentrically arranged with the water pipe.

4. An economizer for a power plant according to claim 2, characterized in that, There are two water pipes between the two opposing guide channels, and the fins on the two water pipes are arranged in an alternating manner.

5. An economizer for a power plant according to claim 2, characterized in that, A sealing plate is fixed to the lower side of two adjacent guide vanes that are not in the same group.

6. An economizer for a power plant according to claim 5, characterized in that, The sealing plate has a V-shaped cross-section.

7. An economizer for a power plant according to claim 1, characterized in that, The cross-section of the middle shell is rectangular, and both its upper and lower ends are fixed to the deformable tube. The end of the deformable tube near the middle shell is rectangular, and the end away from the middle shell is round.

8. An economizer for a power plant according to claim 7, characterized in that, A connecting flange is fixed to the end of the deformable tube away from the middle shell.

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