Economizer with waste heat recovery function

Abstract

The utility model discloses an economizer with waste heat recovery, which comprises a shell, two butt flanges are fixedly communicated with the outer wall of the shell, a U-shaped frame is fixedly connected inside the shell, a plurality of snakelike heat exchange tubes are fixedly embedded inside the U-shaped frame, and the snakelike heat exchange tubes are fixedly connected with the U-shaped frame. A plurality of metal heat exchange pieces are evenly and fixedly arranged on the outer walls of the multiple S-shaped heat exchange pipes in a sleeving mode, and the two ends of each S-shaped heat exchange pipe are fixedly communicated with sleeves. By means of the S-shaped heat exchange pipe, the metal heat exchange pieces and the sleeve structure, flue gas waste heat recovery is effectively achieved; by arranging a flow dividing pipe, a booster pump and a high-pressure nozzle, heated hot water can be used for conducting high-pressure cleaning on smoke dust on the outer walls of a snake-shaped heat exchange pipe and a metal heat exchange piece, and the situation that the heat exchange efficiency is affected by accumulated dust is avoided; and the round water baffle can guide smoke to enter the smoke exhaust pipe, sewage is discharged through the water drainage pipe, the overall structure achieves the waste heat recovery and cleaning functions, and continuous and efficient operation of equipment is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of economizer technology, and in particular to an economizer with waste heat recovery. Background Technology

[0002] An economizer is a heat exchange device used in boiler systems to recover waste heat from the flue gas at the tail end of the boiler. Its main function is to use the heat of the low-temperature flue gas to heat the feedwater entering the boiler, thereby reducing the boiler exhaust temperature, improving the boiler's thermal efficiency, reducing fuel consumption, and achieving the goal of energy conservation and emission reduction.

[0003] In existing technologies, boiler flue gas contains a large amount of fly ash, unburned particles, and sulfate scale. After long-term operation, ash layers easily form on the surface of economizer heat exchange tubes and fins. Ash accumulation increases heat transfer resistance and seriously affects the waste heat recovery effect. Manual cleaning poses safety hazards (high temperature, confined space operation) and is difficult to completely remove ash accumulation in dead corners between tube bundles. Therefore, we propose an economizer with waste heat recovery to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing an economizer with waste heat recovery.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An economizer with waste heat recovery includes a shell. Two connecting flanges are fixedly connected to the outer wall of the shell. A U-shaped frame is fixedly connected inside the shell. Multiple serpentine heat exchange tubes are fixedly embedded inside the U-shaped frame. Multiple metal heat exchange fins are uniformly fixedly fitted onto the outer walls of the serpentine heat exchange tubes. Sleeves are fixedly connected to both ends of each serpentine heat exchange tube. Cold water inlet pipe and hot water outlet pipe are fixedly connected to one end of two sleeves, respectively. A diversion pipe is fixedly connected to the top of one of the sleeves. A booster pump is fixedly connected to one end of the diversion pipe. A horizontal pipe is fixedly connected to the output end of the booster pump. Multiple high-pressure nozzles are fixedly connected to the outer wall of the horizontal pipe. A drain pipe is fixedly connected to the outer wall of the shell. A smoke exhaust assembly is provided at the bottom of the shell.

[0007] Preferably, the smoke exhaust assembly includes a smoke exhaust pipe, wherein the bottom of one of the connecting flanges is fixedly connected to the top of the smoke exhaust pipe, and multiple supports are fixedly connected to the top of the smoke exhaust pipe, and the top of the multiple supports is fixedly connected to the same circular baffle plate, so that the cooled flue gas can be discharged by setting the smoke exhaust assembly.

[0008] Preferably, the outer wall of the shell has multiple through holes, the inner walls of the multiple through holes are fixedly connected to the outer walls of both ends of multiple serpentine heat exchange tubes, and the inner walls of the multiple through holes are mechanically sealed.

[0009] Preferably, the outer wall of the housing is provided with an assembly hole, the inner wall of the assembly hole is fixedly connected to the outer wall of the horizontal tube, and the inner wall of the assembly hole is mechanically sealed.

[0010] Preferably, a mating sleeve is fixedly connected to the inner wall of the housing, the inner wall of the mating sleeve is in contact with one end of the horizontal tube, and the end of the horizontal tube in contact with the mating sleeve is sealed.

[0011] Preferably, electronic valves are fixedly installed on the outer walls of both the drain pipe and the diversion pipe, and a water pump is fixedly connected to one end of the cold water inlet pipe. The opening and closing of the drain pipe and the diversion pipe are controlled by the electronic valves.

[0012] Compared with the prior art, the advantages of this utility model are:

[0013] This solution effectively recovers waste heat from flue gas through a serpentine heat exchange tube, metal heat exchange fins, and a sleeve structure. By setting up a diversion pipe, a booster pump, and high-pressure nozzles, heated hot water can be used to perform high-pressure cleaning of the dust on the outer wall of the serpentine heat exchange tube and metal heat exchange fins, preventing dust accumulation from affecting heat exchange efficiency. A circular baffle plate guides the flue gas into the exhaust pipe, and the wastewater is discharged through the drain pipe. The overall structure realizes waste heat recovery and cleaning functions, ensuring the continuous and efficient operation of the equipment. Attached Figure Description

[0014] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a three-dimensional structural diagram of an economizer with waste heat recovery proposed in this utility model;

[0016] Figure 2 This is a schematic cross-sectional view of an economizer with waste heat recovery proposed in this utility model.

[0017] Figure 3 This is a front view schematic diagram of an economizer with waste heat recovery proposed in this utility model;

[0018] Figure 4 This is a partial cross-sectional three-dimensional structural diagram of an economizer with waste heat recovery proposed in this utility model.

[0019] In the diagram: 1. Shell; 2. Connecting flange; 3. U-shaped frame; 4. Serpentine heat exchange tube; 5. Metal heat exchange fin; 6. Sleeve; 7. Cold water inlet pipe; 8. Hot water outlet pipe; 9. Diverter pipe; 10. Booster pump; 11. Horizontal pipe; 12. High-pressure nozzle; 13. Connecting sleeve; 14. Smoke exhaust pipe; 15. Drain pipe; 16. Electronic valve; 17. Circular baffle. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0021] Depend on Figures 1-4 As shown, an economizer with waste heat recovery is disclosed, comprising a shell 1, two connecting flanges 2 fixedly connected to the outer wall of the shell 1, a U-shaped frame 3 fixedly connected inside the shell 1, and multiple serpentine heat exchange tubes 4 fixedly embedded inside the U-shaped frame 3. The serpentine heat exchange tubes 4 are made of seamless steel pipes. Multiple through holes are opened on the outer wall of the shell 1, and the inner walls of the multiple through holes are fixedly connected to the outer walls of the two ends of the multiple serpentine heat exchange tubes 4 respectively. Multiple metal heat exchange plates 5 are uniformly fixedly fitted on the outer walls of the multiple serpentine heat exchange tubes 4. The metal heat exchange plates 5 are made of copper.

[0022] Both ends of the serpentine heat exchange tube 4 are fixedly connected to sleeves 6. One end of each sleeve 6 is fixedly connected to a cold water inlet pipe 7 and a hot water outlet pipe 8. The top of one of the sleeves 6 is fixedly connected to a diversion pipe 9. One end of the diversion pipe 9 is fixedly connected to a booster pump 10. The booster pump 10 pressurizes the water by converting mechanical energy into the static pressure energy of the fluid.

[0023] The output end of the booster pump 10 is fixedly connected to a horizontal pipe 11. The outer wall of the housing 1 has an assembly hole, and the inner wall of the assembly hole is fixedly connected to the outer wall of the horizontal pipe 11. Multiple high-pressure nozzles 12 are fixedly connected to the outer wall of the horizontal pipe 11. The high-pressure nozzles 12 are conical after spraying water. A docking sleeve 13 is fixedly connected to the inner wall of the housing 1. The inner wall of the docking sleeve 13 is in contact with one end of the horizontal pipe 11. The docking sleeve 13 assists in the installation of the horizontal pipe 11.

[0024] A drain pipe 15 is fixedly connected to the outer wall of the housing 1. An electronic valve 16 is fixedly installed on the outer wall of both the drain pipe 15 and the diversion pipe 9. A water pump is fixedly connected to one end of the cold water inlet pipe 7. The water pump draws external water into the cold water inlet pipe 7.

[0025] The bottom of the housing 1 is provided with a smoke exhaust assembly, which includes a smoke exhaust pipe 14. The bottom of one of the connecting flanges 2 is fixedly connected to the top of the smoke exhaust pipe 14. Multiple brackets are fixedly connected to the top of the smoke exhaust pipe 14, and the top of the multiple brackets is fixedly connected to the same circular baffle 17. The circular baffle 17 can prevent water droplets from entering the smoke exhaust pipe.

[0026] Working principle: When the shell 1 is connected to the boiler, it connects to the boiler's flue gas inlet port via the connecting flange 2 at the top of the shell 1. The flue gas from the boiler's tail end enters the interior of the shell 1 through the flue and existing pipes. The heated flue gas exchanges heat with multiple serpentine heat exchange tubes 4 and multiple metal heat exchange fins 5. Meanwhile, a water pump draws external water into the cold water inlet pipe 7, which then enters the multiple serpentine heat exchange tubes 4 through the connected sleeve 6. The heated flue gas heats the water through heat transfer, achieving the purpose of waste heat recovery. The heated water is discharged from the other end of the multiple serpentine heat exchange tubes 4 and from the hot water outlet pipe 8 on another sleeve 6. The heat-exchanged flue gas enters the exhaust pipe 14 through the circular baffle 17. Inside, the existing spray tower performs spraying treatment. When the dust in the flue gas accumulates on the outer walls of multiple metal heat exchange plates 5 and multiple serpentine heat exchange tubes 4, the electronic valve 16 on the diversion pipe 9 is opened, allowing the heated water to enter the diversion pipe 9 and the horizontal pipe 11. The water is then pressurized by the booster pump 10, causing the hot water to be discharged downwards through multiple high-pressure nozzles 12. This cleans the dust on the outer walls of the multiple metal heat exchange plates 5 and multiple serpentine heat exchange tubes 4. The wastewater drips downwards between the shell 1 and the exhaust pipe 14. The electronic valve 16 on the drain pipe 15 is then opened to discharge the wastewater, completing the cleaning process and preventing it from affecting the subsequent heat exchange process of the multiple metal heat exchange plates 5 and multiple serpentine heat exchange tubes 4.

[0027] It should be noted that, in actual use, an existing PLC controller can be added. The PLC controller is electrically connected to the two electronic valves 16 and the booster pump, which facilitates the control of the overall operation.

[0028] All standard parts used in this utility model can be purchased from the market. Irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. Furthermore, the structure and principle of the components known to those skilled in the art can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0029] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An economizer with waste heat recovery, comprising a shell (1), characterized in that, The outer wall of the shell (1) is fixedly connected to two connecting flanges (2). The interior of the shell (1) is fixedly connected to a U-shaped frame (3). Multiple serpentine heat exchange tubes (4) are fixedly embedded inside the U-shaped frame (3). Multiple metal heat exchange plates (5) are uniformly fixedly fitted on the outer wall of the multiple serpentine heat exchange tubes (4). Both ends of the serpentine heat exchange tubes (4) are fixedly connected to sleeves (6). One end of the two sleeves (6) is fixedly connected to a cold water inlet pipe (7) and a hot water outlet pipe (8). The top of one of the sleeves (6) is fixedly connected to a diversion pipe (9). One end of the diversion pipe (9) is fixedly connected to a booster pump (10). The output end of the booster pump (10) is fixedly connected to a horizontal pipe (11). The outer wall of the horizontal pipe (11) is fixedly connected to multiple high-pressure nozzles (12). The outer wall of the shell (1) is fixedly connected to a drain pipe (15). The bottom of the shell (1) is provided with a smoke exhaust assembly.

2. An economizer with waste heat recovery according to claim 1, characterized in that, The smoke exhaust assembly includes a smoke exhaust pipe (14), wherein the bottom of one of the connecting flanges (2) is fixedly connected to the top of the smoke exhaust pipe (14), and multiple brackets are fixedly connected to the top of the smoke exhaust pipe (14), and the top of the multiple brackets is fixedly connected to the same circular baffle plate (17).

3. An economizer with waste heat recovery according to claim 1, characterized in that, The outer wall of the shell (1) is provided with multiple through holes, and the inner walls of the multiple through holes are respectively fixedly connected to the outer walls of the two ends of multiple serpentine heat exchange tubes (4).

4. An economizer with waste heat recovery according to claim 1, characterized in that, The outer wall of the housing (1) is provided with an assembly hole, and the inner wall of the assembly hole is fixedly connected to the outer wall of the horizontal tube (11).

5. An economizer with waste heat recovery according to claim 1, characterized in that, The inner wall of the housing (1) is fixedly connected to a mating sleeve (13), and the inner wall of the mating sleeve (13) is in contact with one end of the horizontal tube (11).

6. An economizer with waste heat recovery according to claim 1, characterized in that, Electronic valves (16) are fixedly installed on the outer walls of the drain pipe (15) and the diversion pipe (9), and a water pump is fixedly connected to one end of the cold water inlet pipe (7).

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