Flue gas waste heat utilization device of heat-conducting oil furnace

Abstract

The utility model discloses a heat conduction oil furnace smoke waste heat utilization device which comprises a smoke exhaust pipe, the top of the smoke exhaust pipe is communicated with a connecting pipe, the top end of the connecting pipe is communicated with a waste gas pipe, two first electric push rods fixedly connected with the smoke exhaust pipe are inserted into the top of the smoke exhaust pipe in a penetrating mode, and the inner wall of the smoke exhaust pipe is connected with a sealing block in a sliding mode. The top of the sealing block is fixedly connected with the two first electric push rods, the top of the sealing block makes contact with the connecting pipe and the smoke exhaust pipe, annularly-distributed air outlet holes are formed in the sealing block, and annularly-distributed air inlet holes are formed in the smoke exhaust pipe. According to the waste heat utilization device, a switch of the waste heat utilization device can be controlled, damage to the heat exchange pipe caused by high-temperature smoke of the hot oil furnace when the waste heat utilization device is not used is effectively avoided, then the service life of the device is prolonged, and automatic cleaning of the heat exchange pipe can be achieved.

Description

Technical Field

[0001] This utility model relates to the field of thermal oil furnace technology, and more specifically, to a device for utilizing waste heat from flue gas of a thermal oil furnace. Background Technology

[0002] A waste heat recovery device for thermal oil furnace flue gas is a device used to recover waste heat from the flue gas emitted by thermal oil furnaces. Common examples include flue gas waste heat recovery units, which aim to improve energy utilization efficiency, reduce energy waste, lower operating costs for enterprises, and reduce heat emissions to the environment.

[0003] Thermal oil furnace flue gas waste heat utilization devices typically employ two methods: direct contact and indirect heat exchange. Indirect heat exchange is the most common method, where the high-temperature flue gas emitted from the thermal oil furnace comes into contact with a pipe containing the medium to be heated. The high-temperature flue gas heats the medium through the pipe, thereby utilizing the waste heat of the thermal oil furnace flue gas.

[0004] However, in actual use, if the thermal oil furnace is operating at a low load, the amount and temperature of the flue gas generated may not be sufficient for the waste heat recovery device to operate efficiently. In this case, the waste heat recovery effect is insufficient and the device cannot be used. However, the flue gas will still come into contact with the heat exchange tubes, causing unnecessary damage to the tubes. Alternatively, if the heat medium is saturated, the medium in the waste heat recovery device will not be used, but the heat exchange tubes will still come into contact with the hot gas, causing some damage to the tubes and affecting the service life of the thermal oil furnace flue gas waste heat recovery device. Utility Model Content

[0005] In view of the problems existing in the prior art, the purpose of this utility model is to provide a waste heat utilization device for thermal oil furnace flue gas to solve the problems in the background technology.

[0006] To achieve the above objectives, the present invention adopts the following technical solution;

[0007] A waste heat recovery device for thermal oil furnace flue gas includes an exhaust pipe, a connecting pipe at the top of the exhaust pipe, a waste gas pipe at the top of the connecting pipe, two electric push rods fixedly connected to the top of the exhaust pipe, a sealing block slidably connected to the inner wall of the exhaust pipe, the top of the sealing block being fixedly connected to the two electric push rods respectively, the top of the sealing block contacting the connecting pipe and the exhaust pipe respectively, annularly distributed air outlet holes on the sealing block, annularly distributed air inlet holes on the exhaust pipe, a sleeve fixedly connected to the exhaust pipe, the air inlet holes being located inside the sleeve, annularly distributed return pipes at the top of the sleeve, the top of the return pipes being connected to the waste gas pipe, and annularly distributed heat exchange tubes inserted on the sleeve.

[0008] As a further description of the above technical solution:

[0009] Two electric push rods are inserted through the sleeve and fixedly connected to it. A lifting ring is provided inside the sleeve. The top of the lifting ring is fixedly connected to the two electric push rods. A ring-shaped circular ring is fixedly connected to the inner side of the lifting ring. A cleaning brush is fixedly connected to the inner wall of the circular ring. The cleaning brush is ring-shaped and sleeved on the heat exchange tube.

[0010] As a further description of the above technical solution:

[0011] Water rings are fitted on both the sleeve and the flue pipe. The bottom of each of the two water rings is connected to a water pipe. The top and bottom of each of the two water rings are respectively connected to the two ends of the annularly distributed heat exchange tubes.

[0012] As a further description of the above technical solution:

[0013] A one-way valve is installed on the return pipe, and the one-way valve is located above the sleeve.

[0014] As a further description of the above technical solution:

[0015] The sleeve has an embedded heat insulation layer, which is sleeved on the heat exchange tube.

[0016] Compared with existing technologies, the advantages of this utility model are:

[0017] This solution can control the on / off state of the waste heat recovery device, effectively preventing damage to the heat exchange tubes caused by the high-temperature flue gas from the hot oil furnace when the waste heat recovery device is not in use, thereby improving the service life of the device. It can also achieve automatic cleaning of the heat exchange tubes, improving the practicality of the device. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present utility model;

[0019] Figure 2 This is a cross-sectional view of the present invention;

[0020] Figure 3 This utility model Figure 2 Enlarged view of section A;

[0021] Figure 4 This is a diagram showing the positional relationship between the heat exchange tube and the annulus in this utility model.

[0022] Explanation of the labels in the diagram:

[0023] 1. Exhaust pipe; 2. Connecting pipe; 3. Waste gas pipe; 4. Electric push rod one; 5. Sealing block; 6. Air outlet; 7. Air inlet; 8. Sleeve; 9. Return pipe; 10. Heat exchange tube; 11. Electric push rod two; 12. Lifting ring; 13. Circular ring; 14. Cleaning brush; 15. Water ring; 16. Water pipe; 17. One-way valve; 18. Insulation layer. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0025] Please see Figures 1-4 In this utility model: a waste heat utilization device for flue gas from a thermal oil furnace includes a flue pipe 1, a connecting pipe 2 connected to the top of the flue pipe 1, a waste gas pipe 3 connected to the top of the connecting pipe 2, two electric push rods 4 fixedly connected to the top of the flue pipe 1, a sealing block 5 slidably connected to the inner wall of the flue pipe 1, the top of the sealing block 5 being fixedly connected to the two electric push rods 4 respectively, the top of the sealing block 5 contacting the connecting pipe 2 and the flue pipe 1 respectively, annularly distributed air outlet holes 6 being opened on the sealing block 5, annularly distributed air inlet holes 7 being opened on the flue pipe 1, a sleeve 8 fixedly connected to the flue pipe 1, the air inlet holes 7 being located inside the sleeve 8, annularly distributed return pipes 9 connected to the top of the sleeve 8, the top of the return pipe 9 being connected to the waste gas pipe 3, and annularly distributed heat exchange tubes 10 being inserted into the sleeve 8.

[0026] In this invention, the flue gas generated by the thermal oil furnace first enters the exhaust pipe 1. When the waste heat of the thermal oil furnace flue gas is being recovered, the top of the sealing block 5 contacts the bottom of the connecting pipe 2, sealing the bottom of the connecting pipe 2. At this time, the thermal oil furnace flue gas enters the sleeve 8 through the air inlet 7. Then, the thermal oil furnace flue gas flows between the exhaust pipe 1 and the sleeve 8 and flows into the waste gas pipe 3 through the return pipe 9 and is discharged into the flue gas treatment equipment. During the flow of the thermal oil furnace flue gas between the sleeve 8 and the exhaust pipe 1, the user injects the medium to be heated from one end of the heat exchange tube 10. The medium flows inside the heat exchange tube 10. During this process, the thermal oil furnace flue gas heats the medium through the heat exchange tube 10. The user then discharges the medium through the heat exchange tube 10, and the heated medium can be used, thus achieving the utilization of the waste heat of the thermal oil furnace flue gas.

[0027] If the thermal oil heater is operating at a low load or the heat medium is saturated, the heat medium does not need to be used. The user can activate the electric push rod 4, which will cause the sealing block 5 to descend. The sealing block 5 will detach from the bottom of the connecting pipe 2 until it contacts the air inlet 7. At this point, the sealing block 5 will seal the air inlet 7. The high-temperature flue gas from the thermal oil heater will pass through the air outlet 6, through the sealing block 5, and enter the exhaust pipe 3 through the connecting pipe 2 before being discharged into the flue gas treatment equipment. In this case, the high-temperature flue gas from the thermal oil heater does not need to contact the heat exchange tube 10, thereby reducing the damage to the heat exchange tube 10 caused by the high-temperature flue gas and effectively extending the service life of the waste heat utilization device.

[0028] Please see Figures 1-4 In this case, two electric push rods 11 are inserted through the sleeve 8 and fixedly connected to it. A lifting ring 12 is provided inside the sleeve 8. The top of the lifting ring 12 is fixedly connected to the two electric push rods 11 respectively. A ring-shaped circular ring 13 is fixedly connected to the inner side of the lifting ring 12. A cleaning brush 14 is fixedly connected to the inner wall of the circular ring 13. The cleaning brush 14 is ring-shaped and sleeved on the heat exchange tube 10.

[0029] In this invention, when the waste heat in the flue gas of the thermal oil furnace is not needed, the user activates the electric push rod 11 to move the lifting ring 12 up and down. During this process, the lifting ring 12 drives the cleaning brush 14 to slide up and down on the surface of the heat exchange tube 10 through the ring 13, thereby scraping off the impurities and dirt attached to the surface of the heat exchange tube 10. This effectively reduces the impact of the impurities and dirt attached to the surface of the heat exchange tube 10 on heat exchange, improves the efficiency of waste heat utilization of the flue gas of the thermal oil furnace, and thus improves the practicality of the device. The cleaned impurities will be carried into the exhaust pipe 3 and discharged when the waste heat of the flue gas is recovered again.

[0030] Please see Figures 1-3 In this case, water rings 15 are fitted on both the sleeve 8 and the flue pipe 1. The bottom of each water ring 15 is connected to a water pipe 16. The top and bottom of each water ring 15 are connected to the two ends of the annularly distributed heat exchange tubes 10.

[0031] In this invention, the water ring 15 can collect the medium entering and exiting the heat exchange tube 10 and discharge it into or out of the two water pipes 16, which is beneficial for the user to use the medium.

[0032] Please see Figures 1-3 Among them, a one-way valve 17 is installed on the return pipe 9. The one-way valve 17 is located above the sleeve 8. The one-way valve 17 can prevent the flue gas in the exhaust pipe 3 from flowing back into the sleeve 8.

[0033] Please see Figure 3Among them, the inner part of the sleeve 8 is provided with a heat insulation layer 18, and the heat insulation layer 18 is sleeved on the heat exchange tube 10.

[0034] In this invention, the heat insulation layer 18 can prevent the heat from flue gas from spreading outward from the sleeve 8, thereby improving the practicality of the device.

[0035] The above are merely preferred embodiments of this utility model; however, the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and its improved concept, should be included within the scope of protection of this utility model.

Claims

1. A device for utilizing waste heat from flue gas of a thermal oil furnace, comprising a flue pipe (1), characterized in that: The top of the exhaust pipe (1) is connected to a connecting pipe (2), and the top of the connecting pipe (2) is connected to a waste gas pipe (3). Two electric push rods (4) are inserted into the top of the exhaust pipe (1) and fixedly connected thereto. A sealing block (5) is slidably connected to the inner wall of the exhaust pipe (1). The top of the sealing block (5) is fixedly connected to the two electric push rods (4) respectively. The top of the sealing block (5) is in contact with both the connecting pipe (2) and the exhaust pipe (1). The sealing block (5) has annularly distributed air outlet holes (6), the flue pipe (1) has annularly distributed air inlet holes (7), the flue pipe (1) is fitted with a sleeve (8) fixedly connected to it, the air inlet holes (7) are located inside the sleeve (8), the top of the sleeve (8) is connected to annularly distributed return pipes (9), the top of the return pipes (9) is connected to the exhaust pipe (3), and annularly distributed heat exchange tubes (10) are inserted through the sleeve (8).

2. The waste heat recovery device for thermal oil furnace flue gas according to claim 1, characterized in that: Two electric push rods (11) are inserted through the sleeve (8) and fixedly connected to it. A lifting ring (12) is provided inside the sleeve (8). The top of the lifting ring (12) is fixedly connected to the two electric push rods (11) respectively. A ring-shaped circular ring (13) is fixedly connected to the inner side of the lifting ring (12). A cleaning brush (14) is fixedly connected to the inner wall of the circular ring (13). The cleaning brush (14) is ring-shaped and sleeved on the heat exchange tube (10).

3. The waste heat recovery device for thermal oil furnace flue gas according to claim 1, characterized in that: Water rings (15) are fitted on both the sleeve (8) and the flue pipe (1). The bottom of each of the two water rings (15) is connected to a water pipe (16). The top and bottom of each of the two water rings (15) are connected to the two ends of the annularly distributed heat exchange tubes (10).

4. The waste heat recovery device for thermal oil furnace flue gas according to claim 1, characterized in that: A one-way valve (17) is installed on the return pipe (9), and the one-way valve (17) is located above the sleeve (8).

5. The waste heat recovery device for thermal oil furnace flue gas according to claim 1, characterized in that: The sleeve (8) is fitted with a heat insulation layer (18), which is sleeved on the heat exchange tube (10).

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