Waste heat recovery device for low-temperature flue gas of industrial heating furnace

Abstract

The utility model relates to the technical field of waste heat recovery, and discloses an industrial heating furnace low-temperature flue gas waste heat recovery device which comprises a heat exchanger, a gas inlet pipe is fixedly connected to one side of the heat exchanger, a connecting pipe is arranged at the lower end of the gas inlet pipe, and a gas drainage pipe is arranged on the side, away from the gas inlet pipe, of the connecting pipe. A fixing ring is fixedly connected to the inner wall, located below the air inlet pipe, of the connecting pipe, a filter screen is installed at the upper end of the fixing ring, a plurality of fixing rods are fixedly connected to the lower end of the fixing ring, two sets of fixing blocks are fixedly connected to the inner walls of the fixing rods, and rotating rods are rotationally installed in the two sets of fixing blocks; flue gas is conveyed into the connecting pipe, the gas inlet pipe and the heat exchanger from the gas drainage pipe, so that the waste heat recovery effect is achieved, gas can drive fan blades to rotate, the fan blades can drive a rotating rod to rotate in a fixing block, then the rotating rod can drive a mounting block and bristles to rotate, the filter screen can be cleaned, flue gas conveying is enhanced, and the waste heat recovery effect is achieved. And the waste heat recovery efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, in particular to a waste heat recovery device for low-temperature flue gas of an industrial heating furnace. Background Art

[0002] In the metal processing industry, a heating furnace is a device that heats metal materials to a certain temperature. When the metal materials reach the rolling temperature, they are taken out of the heating furnace for subsequent processing. Heating furnaces are widely used. When in use, heating furnaces generate a lot of heat. Part of the heat from the heating furnace will flow out from the chimney pipe, which causes heat waste.

[0003] The patent document with authorized announcement number CN215217225U discloses a waste heat recovery device for an industrial heating furnace, including a waste heat recovery box, wherein heat conducting plates are evenly distributed inside the waste heat recovery box, and adjacent heat conducting plates form a hot air flow channel with the side walls of the waste heat recovery box, and waste heat recovery pipes are provided in the middle of the heat conducting plates, and heat conducting rods are evenly distributed on both sides of the heat conducting plates. The heat conducting rods are made of copper, and the heat conducting plates are made of copper. An air intake pipe passes through the front end of the bottom left side of the waste heat recovery box, and the lower left end of the intake pipe is fixedly connected to the right end of the bent pipe through a flange, and a filter plate is fixedly connected to the left end of the intake pipe. The waste heat recovery box efficiently utilizes the waste heat of the heating furnace through the heat conducting plates and the heat conducting rods. The filter plate filters the smoke dust in the hot air, and the bent pipe collects the smoke dust of the heating furnace flue gas to avoid clogging the waste heat recovery box, which is worthy of vigorous promotion.

[0004] When the above device is implemented, when the filter plate is in use, the surface of the filter plate that initially contacts the flue gas will be sticky with smoke dust, thereby affecting the gas from entering the waste heat recovery box, thereby reducing the waste heat recovery efficiency. Utility Model Content

[0005] The purpose of this utility model is to provide a waste heat recovery device for low-temperature flue gas of an industrial heating furnace, which solves the problem that when the above device is implemented, when the filter plate is in use, the surface where the filter plate initially contacts the flue gas will stick to smoke dust, thereby affecting the gas from entering the waste heat recovery box, thereby reducing the waste heat recovery efficiency.

[0006] An embodiment of the present application provides a waste heat recovery device for low-temperature flue gas in an industrial heating furnace, including a heat exchanger, wherein one side of the heat exchanger is fixedly connected to an air intake pipe, the lower end of the air intake pipe is provided with a connecting pipe, and the side of the connecting pipe away from the air intake pipe is provided with an air discharge pipe, the inner wall of the connecting pipe located below the air intake pipe is fixedly connected to a fixing ring, the upper end of the fixing ring is installed with a filter screen, the lower end of the fixing ring is fixedly connected to a plurality of fixing rods, the inner wall of the fixing rod is fixedly connected to two groups of fixing blocks, the interior of the two groups of the fixing blocks are rotatably installed with a rotating rod, the outer wall of the lower end of the rotating rod is fixedly installed with a plurality of fan blades, the upper end of the rotating rod is fixedly connected to a mounting block, the upper end of the mounting block is installed with a plurality of groups of bristles, and the plurality of groups of bristles are in contact with the filter screen.

[0007] By adopting the above technical solution, the flue gas is transported from the exhaust pipe to the connecting pipe, the air inlet pipe and the heat exchanger, thereby playing the role of waste heat recovery, and the gas can drive the fan blades to rotate, and the fan blades can drive the rotating rod to rotate in the fixed block, and then the rotating rod can drive the mounting block and the brush to rotate, which can clean the filter, enhance the flue gas transportation, and enhance the efficiency of waste heat recovery.

[0008] Optionally, the heat exchanger includes a shell, a spiral tube is fixedly mounted on the inner wall of the shell, and an air cavity and a water cavity are provided in the inner wall of the spiral tube.

[0009] By adopting the above technical solution, the arrangement of the spiral disk can play a role in conveying gas and liquid, and the gas can play a role in heating the liquid.

[0010] Optionally, a cover is installed on the upper end of the shell, and a water inlet pipe and a water outlet pipe are installed on the upper ends of the covers located at both ends of the water cavity.

[0011] By adopting the above technical solution, the water inlet pipe and the water outlet pipe can be installed through the cover, thereby facilitating the transportation of water inside the spiral pipe.

[0012] Optionally, the air inlet pipe at the air inlet end of the air cavity is fixedly mounted on the shell, and an air outlet pipe is fixedly mounted on the outer wall of the shell at the air outlet end of the air cavity.

[0013] By adopting the above technical solution, the air inlet pipe can serve as an air intake for the inside of the spiral tube, and the air outlet pipe can serve as an air outlet for the gas inside the spiral tube.

[0014] Optionally, the lower end of the connecting tube is fixedly connected to a collecting shell, and the inner wall of the collecting shell is fixedly connected to two blanking plates.

[0015] By adopting the above technical solution, the collecting shell can be fixed through the connecting pipe, and the collecting shell can fix the blanking plate.

[0016] Optionally, the two blanking plates are arranged to be inclined in an eight-shaped shape.

[0017] By adopting the above technical solution, the two blanking plates are arranged in an eight-shaped tilt, which facilitates the smoke and dust to enter the collection shell and prevents the smoke and dust from splashing upwards.

[0018] Optionally, the connecting pipe is fixedly mounted to the air inlet pipe and the air discharge pipe via flanges.

[0019] By adopting the above technical solution, the connecting pipe, the air inlet pipe and the air discharge pipe can be installed through the flange.

[0020] Optionally, a sealing gasket is provided on the inner wall of the cover.

[0021] By adopting the above technical solution, the cover can be used to install the sealing gasket, and the provision of the sealing gasket can seal the cover and the shell.

[0022] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0023] 1. The technical solution of the present application plays the role of waste heat recovery by transporting the flue gas from the exhaust pipe to the connecting pipe, the air inlet pipe and the heat exchanger. The gas can drive the fan blades to rotate, and the fan blades can drive the rotating rod to rotate in the fixed block. Then the rotating rod can drive the mounting block and the bristles to rotate, which can clean the filter screen, enhance the flue gas transportation, and enhance the efficiency of waste heat recovery.

[0024] 2. The collecting shell can collect the smoke and dust, while the blanking plate can prevent the smoke and dust from splashing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other features, objects and advantages of the present invention will become more apparent from the detailed description of the non-limiting embodiments with reference to the following drawings:

[0026] Figure 1 This is a front view schematic diagram of a waste heat recovery device for low-temperature flue gas in an industrial heating furnace according to the present invention;

[0027] Figure 2 This is a schematic diagram of a top view of a waste heat recovery device for low-temperature flue gas in an industrial heating furnace according to the present invention;

[0028] Figure 3 This is a front view of a partial cross-sectional view of the connecting pipe of a waste heat recovery device for low-temperature flue gas in an industrial heating furnace according to the present invention;

[0029] Figure 4 This utility model is a waste heat recovery device for low-temperature flue gas of an industrial heating furnace. Figure 3 Enlarged view of point A in the middle.

[0030] In the figure: 1. Heat exchanger; 101. Shell; 102. Cover; 103. Coiled tube; 104. Air cavity; 105. Water cavity; 2. Water inlet pipe; 3. Air outlet pipe; 4. Air inlet pipe; 5. Air discharge pipe; 6. Connecting pipe; 7. Flange; 8. Collecting shell; 9. Filter screen; 10. Fixing ring; 11. Fixing rod; 12. Fixing block; 13. Rotating rod; 14. Fan blade; 15. Mounting block; 16. Brush; 17. Blanking plate; 18. Water outlet pipe. DETAILED DESCRIPTION

[0031] See also Figure 1-4 The utility model provides a technical solution: a waste heat recovery device for low-temperature flue gas of an industrial heating furnace, comprising a heat exchanger 1, an air intake pipe 4 fixedly connected to one side of the heat exchanger 1, a connecting pipe 6 provided at the lower end of the air intake pipe 4, an air discharge pipe 5 provided on the side of the connecting pipe 6 away from the air intake pipe 4, a fixing ring 10 fixedly connected to the inner wall of the connecting pipe 6 located below the air intake pipe 4, a filter screen 9 installed at the upper end of the fixing ring 10, a plurality of fixing rods 11 fixedly connected to the lower end of the fixing ring 10, two groups of fixing blocks 12 fixedly connected to the inner wall of the fixing rod 11, a rotating rod 13 rotatably installed inside the two groups of fixing blocks 12, a plurality of groups of fan blades 14 fixedly installed on the outer wall of the lower end of the rotating rod 13, a mounting block 15 fixedly connected to the upper end of the rotating rod 13, a plurality of groups of brushes 16 installed on the upper end of the mounting block 15, and the plurality of groups of brushes 16 contact the filter screen 9;

[0032] The connecting pipe 6 is fixedly installed with the air inlet pipe 4 and the air discharge pipe 5 through the flange 7. The lower end of the connecting pipe 6 is fixedly connected to the collecting shell 8. The inner wall of the collecting shell 8 is fixedly connected to two blanking plates 17. The two blanking plates 17 are arranged in an eight-shaped tilt.

[0033] In the technical solution of the present invention, the flue gas is transported from the exhaust pipe 5 to the connecting pipe 6, the air inlet pipe 4 and the heat exchanger 1, thereby playing a role in waste heat recovery, and the gas can drive the fan blades 14 to rotate, and the fan blades 14 can drive the rotating rod 13 to rotate in the fixed block 12, and then the rotating rod 13 can drive the mounting block 15 and the brush 16 to rotate, which can clean the filter screen 9, enhance the flue gas transportation, and enhance the efficiency of waste heat recovery.

[0034] In addition, the flange 7 can be used to install the connecting pipe 6, the air inlet pipe 4 and the air exhaust pipe 5, the connecting pipe 6 can fix the collecting shell 8, and the collecting shell 8 can fix the blanking plate 17. The two blanking plates 17 are arranged in an eight-shaped tilt, which facilitates the entry of smoke and dust into the collecting shell 8 and prevents smoke and dust from splashing upwards.

[0035] In the technical solution of the present utility model, Figure 1and Figure 2 As shown, the heat exchanger 1 includes a shell 101, and a spiral tube 103 is fixedly installed on the inner wall of the shell 101. An air cavity 104 and a water cavity 105 are provided in the inner wall of the spiral tube 103. The spiral disk can be used to transport gas and liquid, and the gas can heat the liquid. A cover 102 is installed on the upper end of the shell 101. The upper ends of the covers 102 located at both ends of the water cavity 105 are installed with a water inlet pipe 2 and a water outlet pipe 18. The cover 102 can be used to install the water inlet pipe 2 and the water outlet pipe 18, thereby facilitating the installation of the spiral tube. The water inside 103 plays a role in transportation, the air inlet pipe 4 located at the air inlet end of the air cavity 104 is fixedly installed with the shell 101, and the air outlet pipe 3 is fixedly installed on the outer wall of the shell 101 located at the air outlet end of the air cavity 104. The air inlet pipe 4 can be used to intake air into the spiral tube 103, and the air outlet pipe 3 can be used to exhaust the gas inside the spiral tube 103. A sealing gasket is provided on the inner wall of the cover 102, and the sealing gasket can be installed through the cover 102, and the setting of the sealing gasket can seal the cover 102 and the shell 101.

[0036] When in use, first confirm that the low-temperature flue gas exhaust system of the industrial heating furnace has been started to generate low-temperature flue gas to be recovered, and check whether the various components of the waste heat recovery device, including the heat exchanger 1, air inlet pipe 4, connecting pipe 6, vent pipe 5, fixing ring 10, filter screen 9, rotating rod 13, fan blade 14, mounting block 15, brush 16, etc., are firmly installed and in good working condition, ensure that the water inlet pipe 2 and water outlet pipe 18 of the heat exchanger 1 are connected to the corresponding water circulation system, and check the operating status of the water circulation system. The low-temperature flue gas enters the vent pipe 5 from the exhaust port of the industrial heating furnace, and the flue gas is introduced into the connecting pipe 6 through the vent pipe 5. In this process, the large particles of smoke in the smoke are preliminarily filtered and deposited in the collecting shell 8 below the connecting pipe 6, and slide to the bottom of the collecting shell 8 through the eight-shaped inclined blanking plate 17 to prevent the smoke from splashing upwards. The smoke continues to pass through the connecting pipe. The pipe 6 enters the air inlet pipe 4 and finally enters the spiral pipe 103 in the shell 101 of the heat exchanger 1. During this process, the fine particles in the flue gas are further intercepted by the filter 9, ensuring that the gas entering the spiral pipe 103 is relatively clean. At the same time, the flow of flue gas drives the fan blades 14 to rotate, and then drives the rotating rod 13 to rotate in the fixed block 12. The mounting block 15 and the bristles 16 on the rotating rod 13 rotate accordingly, continuously cleaning the filter 9 to prevent the filter 9 from being blocked, ensuring that the flue gas passes smoothly. When the flue gas flows in the spiral pipe 103, the heat is transferred to the water in the spiral pipe 103 through the heat exchange between the air cavity 104 and the water cavity 105. After the water is heated, it flows out through the water outlet pipe 18 and enters the subsequent water circulation system, realizing the waste heat recovery of the low-temperature flue gas. At the same time, the temperature of the flue gas after heat exchange is reduced and discharged from the heat exchanger 1 through the outlet pipe 3.

Claims

1. A waste heat recovery device for low-temperature flue gas from an industrial heating furnace, characterized by: The invention comprises a heat exchanger (1), wherein one side of the heat exchanger (1) is fixedly connected to an air inlet pipe (4), a connecting pipe (6) is provided at the lower end of the air inlet pipe (4), a vent pipe (5) is provided at the side of the connecting pipe (6) away from the air inlet pipe (4), a fixing ring (10) is fixedly connected to the inner wall of the connecting pipe (6) located below the air inlet pipe (4), a filter screen (9) is installed at the upper end of the fixing ring (10), and a plurality of filters are fixedly connected to the lower end of the fixing ring (10). A fixed rod (11) is provided, wherein the inner wall of the fixed rod (11) is fixedly connected with two groups of fixed blocks (12), the interiors of the two groups of fixed blocks (12) are rotatably mounted with a rotating rod (13), the outer wall of the lower end of the rotating rod (13) is fixedly mounted with multiple groups of fan blades (14), the upper end of the rotating rod (13) is fixedly connected with a mounting block (15), the upper end of the mounting block (15) is mounted with multiple groups of bristles (16), and the multiple groups of bristles (16) are in contact with the filter screen (9).

2. The waste heat recovery device for low-temperature flue gas of an industrial heating furnace according to claim 1, characterized in that: The heat exchanger (1) comprises a shell (101), a spiral tube (103) is fixedly mounted on the inner wall of the shell (101), and an air cavity (104) and a water cavity (105) are provided in the inner wall of the spiral tube (103).

3. The waste heat recovery device for low-temperature flue gas of an industrial heating furnace according to claim 2, characterized in that: A cover (102) is installed on the upper end of the shell (101), and a water inlet pipe (2) and a water outlet pipe (18) are installed on the upper ends of the cover (102) located at both ends of the water cavity (105).

4. The waste heat recovery device for low-temperature flue gas of an industrial heating furnace according to claim 2, characterized in that: The air inlet pipe (4) located at the air inlet end of the air cavity (104) is fixedly mounted on the housing (101), and the air outlet pipe (3) is fixedly mounted on the outer wall of the housing (101) located at the air outlet end of the air cavity (104).

5. The waste heat recovery device for low-temperature flue gas of an industrial heating furnace according to claim 1, characterized in that: The lower end of the connecting pipe (6) is fixedly connected to a collecting shell (8), and the inner wall of the collecting shell (8) is fixedly connected to two blanking plates (17).

6. The waste heat recovery device for low-temperature flue gas of an industrial heating furnace according to claim 5, characterized in that: The two blanking plates (17) are arranged in an oblique manner in an eight-shaped manner.

7. The waste heat recovery device for low-temperature flue gas of an industrial heating furnace according to claim 1, characterized in that: The connecting pipe (6) is fixedly mounted to the air inlet pipe (4) and the air discharge pipe (5) via a flange (7).

8. The waste heat recovery device for low-temperature flue gas of an industrial heating furnace according to claim 3, characterized in that: The inner wall of the cover (102) is provided with a sealing gasket.

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