Tunnel kiln heat exchanger with self-cleaning function

Abstract

The utility model relates to a tunnel kiln heat exchanger with a self-cleaning function, which comprises a horizontal heat exchange shell and a heat exchange tube bundle, and is technically characterized in that an air supply pipeline with one closed end is arranged in the center of the horizontal heat exchange shell, and the other end of the air supply pipeline extends to the outside of the horizontal heat exchange shell; the heat exchange tube bundle comprises a plurality of blade-shaped heat exchange tubes which are uniformly arranged around the air supply pipeline, a plurality of rows of spray heads are uniformly arranged on the peripheral surface of the air supply pipeline, the row number of the spray heads is equal to the number of the blade-shaped heat exchange tubes, and each row of spray heads are uniformly arranged in the length direction of the air supply pipeline; each row of nozzles and each blade-shaped heat exchange pipe are alternately arranged on the peripheral face of the air supply pipeline, a long through opening is formed in the bottom of the horizontal heat exchange shell, the peripheral wall of the horizontal heat exchange shell is sleeved with a blocking barrel, the blocking barrel is provided with an ash discharging opening corresponding to the long through opening, and a rotary driving mechanism is arranged on the outer side of the blocking barrel. The cleaning device is good in cleaning effect, prolongs the maintenance period, and is low in consumption of electric energy.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger structure technology, specifically to a tunnel kiln heat exchanger with self-cleaning function. Background Technology

[0002] As is well known, smelting slag ladles, such as copper slag ladles, need to be transported to a slow cooling zone for natural cooling after production. During this process, the smelting slag ladles possess abundant heat energy, which is typically recovered and utilized using waste heat recovery devices. Existing waste heat recovery devices include a tunnel kiln and a heat exchange system. Part of the heat exchange system's heat exchangers are arranged in the ventilation pipes of the tunnel kiln to absorb the convective heat generated by the slag ladles. However, the heat exchange pipes in the heat exchangers suffer from severe ash and dust accumulation, which significantly reduces heat exchange efficiency.

[0003] CN 221882221 U discloses a plate heat exchanger with self-cleaning function, which includes a base, a vibration mechanism disposed on the upper surface of the base, a heat exchanger shell disposed on the upper end of the vibration mechanism, heat conduction pipes disposed at the inlet and outlet of the heat transfer medium of the heat exchanger shell, an air intake drive assembly for driving the vibration mechanism disposed at the exhaust gas inlet of the heat exchanger shell, and an exhaust pipe disposed at the exhaust gas outlet of the heat exchanger shell. This heat exchanger achieves the effect of synchronous vibration dust removal during operation, aiming to prevent particulate impurities in the exhaust gas from adhering to the inner wall of the heat exchanger shell or the outer wall of the heat exchange plate and affecting heat exchange. However, the following problems exist: 1. Long-term operation of the vibration mechanism will consume a large amount of electrical energy; 2. Long-term vibration will accelerate the damage of heat exchanger components, which is not conducive to long-term stable operation. Utility Model Content

[0004] The purpose of this invention is to provide a tunnel kiln heat exchanger with a reasonable structure, reliable use, and self-cleaning function that solves the above problems, has a good cleaning effect, extends the maintenance cycle, and consumes little electricity.

[0005] The technical solution of this utility model is:

[0006] A tunnel kiln heat exchanger with self-cleaning function includes a horizontal heat exchange shell and a heat exchange tube bundle. The horizontal heat exchange shell has an air inlet at the front and an air outlet at the rear. The key technical features are: a closed-end air supply pipe is located at the center of the horizontal heat exchange shell, with the other end extending to the outside of the horizontal heat exchange shell; the heat exchange tube bundle includes multiple blade-shaped heat exchange tubes evenly arranged around the air supply pipe; multiple sets of first connecting ribs are provided between the blade-shaped heat exchange tubes and the air supply pipe; multiple rows of nozzles are evenly arranged on the outer circumferential surface of the air supply pipe, with the number of nozzle rows equal to the number of blade-shaped heat exchange tubes; each row of nozzles is evenly arranged along the length of the air supply pipe; and each row of nozzles and each blade-shaped heat exchange tube are alternately arranged on the outer circumferential surface of the air supply pipe; a long opening is provided at the bottom of the horizontal heat exchange shell; a baffle is fitted on the outer circumferential wall of the horizontal heat exchange shell; the baffle has an ash discharge port corresponding to the long opening; and a rotary drive mechanism is provided on the outer side of the baffle.

[0007] In the aforementioned tunnel kiln heat exchanger with self-cleaning function, the rear end of each of the blade-shaped heat exchange tubes is connected to the inlet water distribution pipeline, the inlet pipe of the inlet water distribution pipeline is led out through the rear end of the side wall of the horizontal heat exchange shell, the front end of each of the blade-shaped heat exchange tubes is connected to the outlet water collection pipeline, and the outlet pipe of the outlet water collection pipeline is led out through the front end of the side wall of the horizontal heat exchange shell.

[0008] The aforementioned tunnel kiln heat exchanger with self-cleaning function has multiple sets of second connecting ribs between the inner peripheral wall of the horizontal heat exchange shell and the top of the blade-shaped heat exchange tube, and multiple sets of third connecting ribs between two adjacent blade-shaped heat exchange tubes.

[0009] The aforementioned tunnel kiln heat exchanger with self-cleaning function includes a rotary drive mechanism comprising a gear ring structure fixed at the front and rear ends of the baffle and a drive gear meshing with the gear ring structure. The front and rear ends of the horizontal heat exchange shell are respectively provided with brackets. The axle of the drive gear is supported between the two brackets. One end of the axle is connected to a drive motor. The drive motor is fixed on one of the brackets.

[0010] The aforementioned tunnel kiln heat exchanger with self-cleaning function has a rear through hole on the rear end face of the blade-shaped heat exchange tube that connects to the outlet of the inlet water distribution pipe, and a front through hole on the front end face of the blade-shaped heat exchange tube that connects to the inlet of the outlet water collection pipe.

[0011] The beneficial effects of this utility model are:

[0012] 1. When cleaning is required, compressed air is introduced into the air supply line, and the compressed gas is sprayed out using each row of nozzles. After the gas is sprayed out, it first cleans the surface of each blade-shaped heat exchange tube that is close to it. Then the gas flows through the horizontal heat exchange shell, achieving the cleaning of the far side surface of each blade-shaped heat exchange tube and the inner wall of the horizontal heat exchange shell. The dust generated during cleaning is discharged through the long through-hole at the bottom of the horizontal heat exchange shell and the ash discharge port on the baffle. The cleaning effect is good.

[0013] 2. Compared with existing technologies, it does not require long-term vibration to shake off smoke and dust, thus extending the maintenance cycle of various components. At the same time, it does not require long-term power connection, greatly reducing the consumption of electrical energy. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 yes Figure 1 Sectional view along the AA direction;

[0016] Figure 3 This is the outline drawing of this utility model.

[0017] In the diagram: 1. Air inlet, 2. Outlet pipe, 3. Water outlet manifold, 4. Horizontal heat exchange shell, 5. Gear ring structure, 6. Baffle, 7. Blade-shaped heat exchange tube, 8. Second connecting rib, 9. Third connecting rib, 10. Inlet water distribution pipe, 11. Inlet pipe, 12. Air outlet, 13. Air supply pipe, 14. Support, 15. First connecting rib, 16. Nozzle, 17. Axle, 18. Drive gear, 19. Drive motor, 20. Ash discharge port, 21. Long through port. Detailed Implementation

[0018] The present invention will be described in detail with reference to the accompanying drawings.

[0019] like Figures 1-3 As shown, the tunnel kiln heat exchanger with self-cleaning function includes a horizontal heat exchange shell 4 and a heat exchange tube bundle. The horizontal heat exchange shell 4 has an air inlet 1 at the front and an air outlet 12 at the rear.

[0020] The horizontal heat exchange shell 4 has a closed air supply pipe 13 at its center, and the other end of the air supply pipe 13 extends to the outside of the horizontal heat exchange shell 4.

[0021] The heat exchange tube bundle includes a plurality of blade-shaped heat exchange tubes 7 evenly arranged around the air supply pipeline 13. Multiple sets of first connecting ribs 15 are provided between the blade-shaped heat exchange tubes 7 and the air supply pipeline 13. In this embodiment, multiple sets of second connecting ribs 8 are provided between the inner peripheral wall of the horizontal heat exchange shell 4 and the top end of the blade-shaped heat exchange tubes 7, and multiple sets of third connecting ribs 9 are provided between adjacent blade-shaped heat exchange tubes 7. The rear end of each blade-shaped heat exchange tube 7 is connected to the inlet water distribution pipeline 10. The inlet pipe 11 of the inlet water distribution pipeline 10 is led out through the rear end of the side wall of the horizontal heat exchange shell 4. The front end of each blade-shaped heat exchange tube 7 is connected to the outlet water collection pipeline 3. The outlet pipe 2 of the outlet water collection pipeline 3 is led out through the front end of the side wall of the horizontal heat exchange shell 4. The rear end face of each blade-shaped heat exchange tube 7 has a rear through hole connected to the outlet of the inlet water distribution pipeline 10, and the front end face of each blade-shaped heat exchange tube 7 has a front through hole connected to the inlet of the outlet water collection pipeline 3.

[0022] Multiple rows of nozzles 16 are evenly arranged on the outer circumferential surface of the air supply pipeline 13. The number of rows of nozzles 16 is equal to the number of blade-shaped heat exchange tubes 7. Each row of nozzles 16 is evenly arranged along the length of the air supply pipeline 13. Each row of nozzles 16 and each blade-shaped heat exchange tube 7 are alternately arranged on the outer circumferential surface of the air supply pipeline 13.

[0023] The bottom of the horizontal heat exchange shell 4 is provided with an elongated opening 21. A baffle 6 is fitted on the outer peripheral wall of the horizontal heat exchange shell 4. The baffle 6 is provided with an ash discharge port 20 corresponding to the elongated opening 21. A rotary drive mechanism is provided on the outer side of the baffle 6. In this embodiment, the rotary drive mechanism includes a gear ring structure 5 fixed at the front and rear ends of the baffle 6 and a drive gear 18 meshing with the gear ring structure 5. The front and rear ends of the horizontal heat exchange shell 4 are respectively provided with brackets 14. The axle 17 of the drive gear 18 is supported between the two brackets 14. One end of the axle 17 is connected to a drive motor 19. The drive motor 19 is fixed on one of the brackets 14.

[0024] Working principle:

[0025] 1. During normal operation, multiple heat exchangers as described in this utility model can be used in parallel. The flue gas generated by the slag bag enters the horizontal heat exchange shell through the air inlet 1. Each blade-shaped heat exchange tube 7 and the medium therein absorb the waste heat of the flue gas and transfer it to the outside of the heat exchanger.

[0026] 2. Multiple heat exchangers are cleaned alternately. During cleaning, the drive motor 19 is started, which drives the baffle 6 to rotate via the drive gear 18 and the gear ring structure 5, so that the ash discharge port 20 on the baffle 6 is aligned with the long through port 21 at the bottom of the horizontal heat exchange shell 4. Then, compressed air is introduced into the air supply pipeline 13, and the compressed gas is sprayed out by each row of nozzles 16. After the gas is sprayed out, it first cleans the surface of each blade-shaped heat exchange tube 7 that is close to it. Then, the gas flows through the horizontal heat exchange shell 4, achieving the cleaning of the distal side surface of each blade-shaped heat exchange tube 7 and the inner wall of the horizontal heat exchange shell 4. The dust generated during cleaning is discharged through the long through port 21 at the bottom of the horizontal heat exchange shell 4 and the ash discharge port 20 on the baffle 6. After cleaning is completed, the drive motor 19 reverses, the baffle 6 returns to its original position, and flue gas continues to be introduced for heat exchange.

[0027] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made within the scope of this utility model should still fall within the scope of this patent.

Claims

1. A tunnel kiln heat exchanger with self-cleaning function, comprising a horizontal heat exchange shell and a heat exchange tube bundle, the front of the horizontal heat exchange shell is provided with an air inlet, and the rear is provided with an air outlet, characterized in that: The horizontal heat exchange shell is provided with a closed air supply pipeline in the center, the other end of the air supply pipeline extends to the outside of the horizontal heat exchange shell, the heat exchange pipe bundle comprises a plurality of blade-shaped heat exchange pipes uniformly arranged around the air supply pipeline, a plurality of first connecting ribs are arranged between the blade-shaped heat exchange pipes and the air supply pipeline, a plurality of rows of nozzles are uniformly arranged on the outer circumferential surface of the air supply pipeline, the number of rows of nozzles is equal to the number of blade-shaped heat exchange pipes, each row of nozzles is uniformly arranged along the length direction of the air supply pipeline, and each row of nozzles and each blade-shaped heat exchange pipe are alternately arranged on the outer circumferential surface of the air supply pipeline, the bottom of the horizontal heat exchange shell is provided with a long opening, the outer circumferential wall of the horizontal heat exchange shell is sleeved with a baffle cylinder, the baffle cylinder is provided with a dust discharging port corresponding to the long opening, and the outer side of the baffle cylinder is provided with a rotary driving mechanism.

2. The tunnel kiln heat exchanger with self-cleaning function according to claim 1, characterized in that: The rear end of each blade-shaped heat exchange pipe is communicated with a water inlet shunt pipeline, the inlet pipeline of the water inlet shunt pipeline is led out through the rear end of the side wall of the horizontal heat exchange shell, and the front end of each blade-shaped heat exchange pipe is communicated with a water outlet collecting pipeline, and the outlet pipeline of the water outlet collecting pipeline is led out through the front end of the side wall of the horizontal heat exchange shell.

3. The tunnel kiln heat exchanger with self-cleaning function according to claim 1, characterized in that: A plurality of second connecting ribs are arranged between the inner circumferential wall of the horizontal heat exchange shell and the top end of the blade-shaped heat exchange pipe, and a plurality of third connecting ribs are arranged between adjacent two blade-shaped heat exchange pipes.

4. The tunnel kiln heat exchanger with self-cleaning function according to claim 1, characterized in that: The rotary driving mechanism comprises gear ring structures fixed to the front and rear ends of the baffle cylinder and a driving gear engaged with the gear ring structures, the front and rear ends of the horizontal heat exchange shell are respectively provided with supports, the wheel shaft of the driving gear is supported between the two supports, one end of the wheel shaft is connected with a driving motor, and the driving motor is fixed to one of the supports.

5. The heat exchanger of the tunnel kiln with self-cleaning function according to claim 2, characterized in that: The rear end surface of the blade-shaped heat exchange pipe is provided with a rear through hole connected with the outlet of the water inlet shunt pipeline, and the front end surface of the blade-shaped heat exchange pipe is provided with a front through hole connected with the inlet of the water outlet collecting pipeline.

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