Boiler smoke exhaust pipeline with waste heat recovery function

Abstract

The boiler smoke exhaust pipeline with the waste heat recovery function comprises a smoke conveying pipeline, an inserting groove is integrally formed in the outer wall of the middle of the smoke conveying pipeline, a waste heat recovery assembly is installed in the inserting groove in a sliding and inserting mode, two positioning plates are symmetrically arranged on the top face of the smoke conveying pipeline, and installation bases are fixedly installed on the top faces of the two positioning plates. Compressed air bottles are fixedly mounted above the two mounting seats, the two compressed air bottles are connected with soot blowing rings through air conveying pipes, the two soot blowing rings are symmetrically mounted on the two sides of the waste heat recovery assembly correspondingly, and flange connecting pieces are fixedly mounted at the left end and the right end of the smoke conveying pipeline correspondingly. Cold water is introduced into the separated heat pipe heat exchanger, high-temperature flue gas transmits heat to the cold water in the heat exchange pipes through the heat conducting fins, the temperature of the cold water is increased after the cold water absorbs the heat, meanwhile, the temperature of the flue gas is reduced, and in the process, the heat efficiency of the boiler is improved, and energy waste and environmental pollution are reduced; and thermal stress damage to subsequent equipment caused by high-temperature flue gas can be effectively avoided.

Description

Technical Field

[0001] This utility model relates to the fields of thermal power generation and environmental protection technology, specifically to a boiler flue gas duct with waste heat recovery function. Background Technology

[0002] Against the backdrop of increasingly tense global energy conditions, energy waste not only exacerbates the contradiction between energy supply and demand but may also threaten national energy security. Improving energy utilization efficiency and reducing heat waste can help alleviate energy pressure. The flue gas at the tail end of the boiler (from the air preheater to the desulfurization tower inlet) contains a large amount of heat energy, with a temperature typically between 120℃ and 160℃. If this heat energy is fully utilized, it will significantly improve the boiler's thermal efficiency and help reduce energy waste and environmental pollution. At the same time, if the high-temperature flue gas is not cooled through an effective heat recovery device during the emission process, it may cause thermal stress damage to subsequent equipment such as flue ducts and desulfurization towers, accelerating equipment wear and shortening equipment lifespan. Utility Model Content

[0003] The purpose of this utility model is to provide a boiler flue gas duct with waste heat recovery function to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A boiler flue gas duct with waste heat recovery function includes a flue gas duct. The outer wall of the flue gas duct is integrally formed with a spigot groove in the middle. A waste heat recovery component is slidably installed in the spigot groove. Two positioning plates are symmetrically provided on the top surface of the flue gas duct. A mounting seat is fixedly installed on the top surface of each positioning plate. A compressed air cylinder is fixedly installed above each mounting seat. Each compressed air cylinder is connected to a soot blowing ring through an air supply pipe. The two soot blowing rings are symmetrically installed on both sides of the waste heat recovery component. Flange connectors are fixedly installed at both ends of the flue gas duct.

[0006] Furthermore, the waste heat recovery assembly includes a mounting plate, with casters installed at the four corners of the bottom surface of the mounting plate, and a separate heat pipe heat exchanger fixedly installed on the top surface of the mounting plate.

[0007] Furthermore, the split heat pipe heat exchanger includes heat exchange tubes, and several heat-conducting fins are fixedly installed on the outer wall of the heat exchange tubes.

[0008] Furthermore, the waste heat recovery assembly also includes a sealing plate, with both ends of the heat exchange tube extending through the sealing plate to the outside of the flue gas duct.

[0009] Furthermore, the front and rear side walls of the sealing plate are integrally formed with magnetic suction plates, and magnets are installed on the left and right side walls of the insertion slot, with the magnets corresponding to the positions of the magnetic suction plates.

[0010] Furthermore, the outer wall dimensions of the soot blowing ring are adapted to the inner wall dimensions of the smoke conveying duct, the inside of the soot blowing ring is a hollow tube, and a connecting pipe is provided on the top surface of the soot blowing ring.

[0011] Furthermore, air outlets are provided on the front face of the soot blowing ring near the inner walls of the four sides of the smoke conveying duct, and air outlet pipes are provided at the four corners of the front face of the soot blowing ring.

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

[0013] 1. When this utility model is used, cold water is introduced into the split heat pipe heat exchanger. The high-temperature flue gas transfers heat to the cold water in the heat exchange tube through the heat conduction plate, so that the cold water absorbs heat and its temperature rises, while the flue gas temperature decreases. This process not only improves the thermal efficiency of the boiler and reduces energy waste and environmental pollution, but also effectively avoids thermal stress damage to subsequent equipment caused by high-temperature flue gas.

[0014] 2. When this utility model is used, compressed air is supplied to the soot blowing ring through a compressed air bottle. The compressed air is further accelerated through the narrow air outlet and air pipe to form a high-speed airflow, which cleans the inner wall of the smoke conveying pipe. The cleaned dust is discharged through both ends of the smoke conveying pipe, thereby achieving efficient and fast soot blowing operation and saving manpower and material resources. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is an exploded view of the overall structure of this utility model;

[0017] Figure 3 This is a structural part drawing of the smoke conveying pipeline of this utility model;

[0018] Figure 4 This is an exploded view of the waste heat recovery component structure of this utility model;

[0019] Figure 5 This is a part drawing of the soot blowing ring structure of this utility model;

[0020] Figure 6 This is a cross-sectional view of the overall structure of this utility model.

[0021] In the diagram: 1. Smoke conveying pipe; 11. Insertion groove; 111. Mounting ear; 112. Magnet; 12. Positioning plate; 13. Connecting hole;

[0022] 2. Waste heat recovery assembly; 21. Mounting plate; 211. Connecting arm; 22. Casters; 23. Separable heat pipe heat exchanger; 231. Heat exchange tube; 232. Heat conduction plate; 24. Sealing plate; 241. Magnetic suction plate; 242. Handle; 25. Sealing ring;

[0023] 3. Mounting base; 31. Support ring; 4. Compressed air cylinder; 5. Soot blowing ring; 51. Connecting pipe; 52. Air outlet; 53. Air outlet pipe; 6. Flange connector. Detailed Implementation

[0024] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1: Please refer to Figures 1-4 A boiler flue gas duct with waste heat recovery function includes a flue gas duct 1. The outer wall of the flue gas duct 1 is integrally formed with a spigot groove 11. A waste heat recovery component 2 is slidably installed in the spigot groove 11. Two positioning plates 12 are symmetrically arranged on the top surface of the flue gas duct 1. Mounting seats 3 are fixedly installed on the top surface of each positioning plate 12. Specifically, the mounting seats 3 are fixedly connected to the positioning plates 12 by bolts. Compressed air cylinders 4 are fixedly installed above each of the two mounting seats 3. Specifically, a support ring is integrally formed on the top surface of each of the two mounting seats 3. 31. Compressed air cylinder 4 is fixedly inserted into the support ring 31. Both compressed air cylinders 4 are connected to soot blowing rings 5 ​​through air supply pipes. Specifically, a connecting hole 13 is opened on the top surface of the flue gas pipeline 1 on one side of the positioning plate 12. The air supply pipe of the compressed air cylinder 4 is connected to the inside of the flue gas pipeline 1 through the connecting hole 13. The two soot blowing rings 5 ​​are symmetrically installed on both sides of the waste heat recovery component 2. Flange connectors 6 are fixedly installed at both ends of the flue gas pipeline 1. Specifically, the flue gas pipeline 1 is fixedly installed between the boiler and the desulfurization tower through the flange connectors 6.

[0026] The waste heat recovery assembly 2 includes a mounting plate 21. A separate heat pipe heat exchanger 23 is fixedly mounted on the top surface of the mounting plate 21. Specifically, two connecting arms 211 are integrally formed on the side wall of the mounting plate 21. The two connecting arms 211 have a through-hole at the front and back. The two connecting arms 211 are fixedly connected to the separate heat pipe heat exchanger 23 by bolts. Moving wheels 22 are installed at the four corners of the bottom surface of the mounting plate 21. Specifically, two slide rails are integrally formed on the bottom surface of the insertion groove 11. The two sets of moving wheels 22 are respectively limited and slid within the two slide rails. The slide rails can limit the overall movement of the waste heat recovery assembly 2, preventing it from shifting within the flue gas duct 1. The separate heat pipe heat exchanger 23 includes a heat exchange tube 231. Several heat-conducting fins 232 are fixedly mounted on the outer wall of the heat exchange tube 231. Specifically, both the heat exchange tube 231 and the heat-conducting fins 232 are made of aluminum alloy with good thermal conductivity. Aluminum alloy has good thermal conductivity... With advantages such as corrosion resistance, the waste heat recovery assembly 2 also includes a sealing plate 24. Both ends of the heat exchange tube 231 extend through the sealing plate 24 to the outside of the flue gas pipeline 1. Specifically, the left and right end faces of the sealing plate 24 are provided with insertion holes for inserting the heat exchange tube 231. A sealing ring 25 for improving the internal sealing of the flue gas pipeline 1 is sandwiched between the sealing plate 24 and the insertion groove 11. A handle 242 for easy gripping is fixedly connected to the right end face of the sealing plate 24. A magnetic suction plate 241 is integrally formed on the front and rear side walls of the sealing plate 24. Magnets 112 are installed on the left and right side walls of the insertion groove 11. The positions of the magnets 112 and the magnetic suction plate 241 are corresponding. Specifically, the left and right side walls of the insertion groove 11 are integrally formed with mounting ears 111. Two magnets 112 are fixedly installed in the grooves opened on the right end faces of the two mounting ears 111 respectively. The magnets 112 can attract the magnetic suction plate 241 to prevent the waste heat recovery assembly 2 from slipping out and falling off.

[0027] Example 2: Please refer to Figure 5 , Figure 6 A boiler flue gas duct with waste heat recovery function is different from Embodiment 1 in that the outer wall size of the soot blowing ring 5 is adapted to the inner wall size of the flue gas duct 1, the inside of the soot blowing ring 5 is a hollow tube, and the top surface of the soot blowing ring 5 is provided with a connecting pipe 51. Specifically, the connecting pipe 51 is connected to the air supply pipe of the compressed air bottle 4. Air outlets 52 are opened on the front end face of the soot blowing ring 5 near the four inner walls of the flue gas duct 1, and air outlet pipes 53 are opened at the four corners of the front end face of the soot blowing ring 5. Specifically, the compressed air bottle 4 supplies compressed air to the soot blowing ring 5 through the air supply pipe. The compressed air further increases the flow velocity through the narrow air outlets 52 and air outlet pipes 53, and finally forms an airflow to blow soot onto the inner wall of the flue gas duct 1. The dust is discharged through the two ends of the flue gas duct 1.

[0028] Working principle: First, the flue gas pipeline 1 is fixedly installed between the boiler and the desulfurization tower through the flange connector 6. Next, the waste heat recovery component 2 is inserted and installed in the insertion slot 11. The magnetic attraction effect of the magnet 112 on the magnetic suction plate 241 is used to prevent the waste heat recovery component 2 from slipping out and falling off. The sealing ring 25 is sandwiched between the sealing plate 24 and the insertion slot 11 to improve the internal sealing of the flue gas pipeline 1.

[0029] In the heat exchange tube 231 of the split heat pipe heat exchanger 23, an inlet pipe and an outlet pipe are respectively installed at both ends. The inlet pipe is used to inject cold water into the heat exchange tube 231, and the outlet pipe is used to transport the water that has completed heat exchange in the heat exchange tube 231 to the next process.

[0030] When the high-temperature flue gas from the boiler passes through the separate heat pipe heat exchanger 23, according to the second law of thermodynamics and the principle of entropy increase, heat always spontaneously transfers from a high-temperature object to a low-temperature object. The high-temperature flue gas transfers heat to the cold water in the heat exchange tube 231 through the heat conduction plate 232. The cold water absorbs heat and its temperature rises. It then flows to the next process through the water outlet pipe, while the temperature of the high-temperature flue gas decreases. This achieves the effect of recovering the waste heat of the high-temperature flue gas.

[0031] When the inside of the flue gas duct 1 needs to be cleaned, the compressed air cylinder 4 is activated to supply compressed air to the blowing ring 5. The compressed air further increases the flow speed through the narrow air outlet 52 and the air outlet pipe 53, and finally forms an airflow to blow the dust off the inner wall of the flue gas duct 1. The cleaned dust is discharged through both ends of the flue gas duct 1, saving manpower and resources, and is convenient and quick. At this point, the work of this device is completed.

[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope of the technology disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A boiler flue gas duct with waste heat recovery function, comprising a flue gas conveying duct (1), characterized in that: The outer wall of the middle part of the flue gas pipeline (1) is integrally formed with a plug groove (11). The waste heat recovery component (2) is slidably installed in the plug groove (11). The top surface of the flue gas pipeline (1) is symmetrically provided with two positioning plates (12). The top surface of the two positioning plates (12) is fixedly installed with mounting bases (3). Compressed air cylinders (4) are fixedly installed above the two mounting bases (3). The two compressed air cylinders (4) are connected to soot blowing rings (5) through air supply pipes. The two soot blowing rings (5) are symmetrically installed on both sides of the waste heat recovery component (2). Flange connectors (6) are fixedly installed at the left and right ends of the flue gas pipeline (1).

2. A boiler flue gas duct with waste heat recovery function according to claim 1, characterized in that: The waste heat recovery assembly (2) includes a mounting plate (21), with casters (22) installed at the four corners of the bottom surface of the mounting plate (21), and a separate heat pipe heat exchanger (23) fixedly installed on the top surface of the mounting plate (21).

3. A boiler flue gas duct with waste heat recovery function according to claim 2, characterized in that: The split heat pipe heat exchanger (23) includes a heat exchange tube (231), and a number of heat-conducting fins (232) are fixedly installed on the outer wall of the heat exchange tube (231).

4. A boiler flue gas duct with waste heat recovery function according to claim 3, characterized in that: The waste heat recovery assembly (2) also includes a sealing plate (24), and both ends of the heat exchange tube (231) extend through the sealing plate (24) to the outside of the flue gas pipeline (1).

5. A boiler flue gas duct with waste heat recovery function according to claim 4, characterized in that: The sealing plate (24) is integrally formed with magnetic suction plates (241) on the front and rear side walls. Magnets (112) are installed on the left and right side walls of the insertion groove (11). The magnets (112) are positioned corresponding to the magnetic suction plates (241).

6. A boiler flue gas duct with waste heat recovery function according to claim 1, characterized in that: The outer wall size of the soot blowing ring (5) is adapted to the inner wall size of the smoke conveying pipe (1). The inside of the soot blowing ring (5) is a hollow tube, and the top surface of the soot blowing ring (5) is provided with a connecting pipe (51).

7. A boiler flue gas duct with waste heat recovery function according to claim 6, characterized in that: The front end face of the soot blowing ring (5) is provided with an air outlet (52) at the position of the inner wall of the four sides of the smoke conveying pipe (1), and an air outlet pipe (53) is provided at the four corners of the front end face of the soot blowing ring (5).

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