A waste heat recovery device for flue gas from a heat preservation furnace

Abstract

This utility model discloses a waste heat recovery device for flue gas from a heat-insulating furnace, comprising a furnace body, a heating chamber located at the upper end of the furnace body, a combustion chamber located at the lower end of the heating chamber, a flue gas outlet located at the upper end of the furnace body, and a connecting pipe located at the upper end of the flue gas outlet. A first heat exchange mechanism for exchanging heat from the flue gas is located inside the connecting pipe. The first heat exchange mechanism includes a fixed plate, a diverter pipe, an inlet pipe, and an outlet pipe. Fixed plates are fixedly installed on both sides inside the connecting pipe, and a plurality of diverter pipes are evenly fixed between the fixed plates. This utility model improves the flue gas filtration and treatment device emitted from the heat-insulating furnace by using diverter pipes to first divert the flue gas, thereby significantly increasing the heat exchange area of ​​the hot flue gas. Compared to devices that only have a heat exchange chamber on the outside of the flue gas outlet pipe, this device can achieve better heat exchange.

Description

Technical Field

[0001] This utility model relates to the field of flue gas treatment technology, specifically to a waste heat recovery device for flue gas from a heat preservation furnace. Background Technology

[0002] A holding furnace is a device that uses energy sources such as electricity, natural gas, or fuel oil to heat metal raw materials to a designed temperature. Through processes such as heat preservation and homogenization, the metal raw materials are heated evenly to reach the required temperature. Its main function is to keep the molten metal at a constant temperature within the casting temperature range, thereby ensuring the stable operation of continuous or semi-continuous casting production processes.

[0003] In existing technologies, heat preservation furnaces generate flue gas during operation, and this flue gas contains a large amount of heat, which is also a considerable energy source. However, existing technologies only perform simple heat exchange on the flue gas, with a small heat exchange area. At the same time, the air inlet of the device cannot utilize this heat, resulting in the heat not being fully utilized. Therefore, an improved flue gas waste heat recovery device for heat preservation furnaces is needed to address this problem. Utility Model Content

[0004] The purpose of this invention is to provide a waste heat recovery device for flue gas from a heat preservation furnace, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a waste heat recovery device for flue gas in a heat preservation furnace, comprising a furnace body, a heating chamber disposed at the upper end of the furnace body, a combustion chamber disposed at the lower end of the heating chamber, a flue gas outlet disposed at the upper end of the furnace body, a connecting pipe disposed at the upper end of the flue gas outlet, a first heat exchange mechanism for exchanging heat from the flue gas disposed inside the connecting pipe, the first heat exchange mechanism comprising a fixed plate, a diverter pipe, a liquid inlet pipe, and a liquid outlet pipe, fixed plates being fixedly disposed on both sides inside the connecting pipe, a plurality of diverter pipes being evenly disposed between the fixed plates, a liquid inlet pipe being fixedly disposed at the lower end of the connecting pipe, and a liquid outlet pipe being fixedly disposed at the upper end of the connecting pipe.

[0006] Preferably, an extension pipe is fixedly provided at the lower end of the connecting pipe, and a blower is fixedly provided at the end of the extension pipe away from the connecting pipe. A smoke exhaust pipe is fixedly provided on one side of the blower surface. The blower and the extension pipe are internally interconnected, and the air outlet of the blower is internally interconnected with the smoke exhaust pipe. The blower can draw in air to accelerate the flow of flue gas, and the flue gas after heat exchange can be discharged through the smoke exhaust pipe. Other filtration and flue gas treatment equipment should be connected after the smoke exhaust pipe, but this is not the focus of protection of this application, so this application will not elaborate further.

[0007] Preferably, the surface of the extension tube is provided with a second heat exchange mechanism for further heat exchange. The second heat exchange mechanism includes a heat exchange tube and an air inlet pipe. The heat exchange tube is fixedly installed in the middle of the extension tube, and a plurality of heat exchange fins are uniformly fixedly installed on the outer surface of the heat exchange tube. An air inlet pipe is fixedly installed on one side of the combustion chamber and is sleeved on the outer surface of the heat exchange tube. Since oxygen is required when the heat dissipation chamber is heating, the air inlet pipe can control the supply of air to the combustion chamber in real time. The air supplied to the combustion chamber through the air inlet pipe can come into contact with the heat exchange tube. In this way, the heat exchange tube can increase the temperature of the air supplied to the combustion chamber through the air inlet pipe. This can effectively prevent the boiler thermal efficiency from decreasing due to the low intake air temperature of the combustion chamber in winter, where the cold air needs to absorb more heat to reach the combustion temperature. Studies have shown that for every 5°C decrease in intake air temperature, the thermal efficiency may decrease by 0.12%. Therefore, the heat of the exhaust gas can be further utilized to improve the thermal efficiency of the combustion chamber.

[0008] Preferably, a baffle is movably mounted on one end of the air inlet pipe via a rotating shaft, and a handle is fixedly mounted on the upper end of the rotating shaft where the baffle is located. The rotating shaft where the baffle is located is a damping rotating shaft. By rotating the handle to open or close the baffle, the size of the opening of the air inlet pipe can be controlled to control the air intake effect.

[0009] Preferably, an ash discharge chamber is provided inside the furnace body at the lower end of the combustion chamber, through which the ash after combustion inside the combustion chamber can be collected and discharged.

[0010] Preferably, a connecting flange is fixedly provided at one end of both the inlet pipe and the outlet pipe; the connecting flange allows for easy connection of the inlet pipe and the outlet pipe to the pump body and the heat exchange water source.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This utility model utilizes a heat exchange water source and multiple diversion pipes to fully contact each other, thereby exchanging the heat of the flue gas in the separation pipe to generate hot water, thus completing one heat recovery cycle without wasting heat. Since this device uses diversion pipes to first divert the flue gas, it can significantly increase the heat exchange area of ​​the hot flue gas. Compared with a heat exchange chamber only set on the outside of the exhaust pipe, this device can exchange heat better.

[0013] 2. The air supplied to the combustion chamber through the air inlet pipe can come into contact with the heat exchange pipe. In this way, the waste heat of the heat exchange pipe can be used to increase the temperature of the air supplied to the combustion chamber through the air inlet pipe, which can effectively prevent the combustion chamber intake temperature from being low in winter. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of a waste heat recovery device for flue gas from a heat preservation furnace according to this utility model.

[0015] Figure 2 This is a side view of a waste heat recovery device for flue gas from a heat preservation furnace according to the present invention.

[0016] Figure 3 This is a cross-sectional view of a waste heat recovery device for flue gas from a heat preservation furnace according to the present invention.

[0017] Figure 4 This utility model relates to a waste heat recovery device for flue gas from a heat preservation furnace. Figure 3 The front view;

[0018] Figure 5 This utility model relates to a waste heat recovery device for flue gas from a heat preservation furnace. Figure 3 A magnified view of a portion of the text.

[0019] In the diagram: 1. Furnace body; 2. Heating chamber; 3. Combustion chamber; 4. Exhaust port; 5. Fixing plate; 6. Diverter pipe; 7. Liquid inlet pipe; 8. Liquid outlet pipe; 9. Extension pipe; 10. Blower; 11. Heat exchanger tube; 12. Air inlet pipe; 13. Baffle; 14. Handle; 15. Ash discharge chamber; 16. Connecting pipe. 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-5 This utility model provides a technical solution: a waste heat recovery device for flue gas of a heat preservation furnace, including a furnace body 1. A heating chamber 2 is provided at the upper end of the furnace body 1. A combustion chamber 3 is provided at the lower end of the heating chamber 2 inside the furnace body 1. A flue gas outlet 4 is provided at the upper end of the furnace body 1. A connecting pipe 16 is provided at the upper end of the flue gas outlet 4. A first heat exchange mechanism for exchanging heat from the flue gas is provided inside the connecting pipe 16. The first heat exchange mechanism includes a fixed plate 5, a diversion pipe 6, a liquid inlet pipe 7, and a liquid outlet pipe 8. Fixed plates 5 are fixedly provided on both sides inside the connecting pipe 16. A plurality of diversion pipes 6 are evenly fixedly provided between the fixed plates 5. A liquid inlet pipe 7 is fixedly provided at the lower end of the connecting pipe 16. A liquid outlet pipe 8 is fixedly provided at the upper end of the connecting pipe 16.

[0022] An extension pipe 9 is fixedly installed at the lower end of the connecting pipe 16. A blower 10 is fixedly installed at the end of the extension pipe 9 away from the connecting pipe 16. A smoke exhaust pipe 17 is fixedly installed on one side of the surface of the blower 10. The blower 10 and the extension pipe 9 are internally interconnected. The air outlet of the blower 10 is internally interconnected with the smoke exhaust pipe 17. The blower 10 can draw in air to accelerate the flow of flue gas. The flue gas after heat exchange can be discharged through the smoke exhaust pipe. Other filtration and flue gas treatment equipment should be connected after the smoke exhaust pipe, but this is not the focus of this application. Therefore, this application will not elaborate further.

[0023] The surface of the extension tube 9 is provided with a second heat exchange mechanism for further heat exchange. The second heat exchange mechanism includes a heat exchange tube 11 and an air inlet tube 12. The heat exchange tube 11 is fixedly installed in the middle of the extension tube 9. Several heat exchange fins are uniformly fixedly installed on the outer surface of the heat exchange tube 11. The air inlet tube 12 is fixedly installed on one side of the combustion chamber 3 and is sleeved on the outer surface of the heat exchange tube 11. Since oxygen is required when the heat dissipation chamber is heating, the air inlet tube 12 can control the supply of air into the combustion chamber 3 in real time. The air supplied into the combustion chamber 3 through the air inlet tube 12 can come into contact with the heat exchange tube 11. In this way, the heat exchange tube 11 can increase the temperature of the air supplied into the combustion chamber 3 by the air inlet tube 12. This can effectively prevent the boiler thermal efficiency from decreasing due to the low air inlet temperature of the combustion chamber 3 in winter, which would require the cold air to absorb more heat to reach the combustion temperature. Studies have shown that for every 5°C decrease in intake air temperature, thermal efficiency may decrease by 0.12%, which allows for further utilization of the heat from the exhaust gas to improve the thermal efficiency of the combustion chamber 3.

[0024] A baffle 13 is movably mounted on one end of the air inlet pipe 12 via a rotating shaft. A handle 14 is fixedly mounted on the upper end of the rotating shaft where the baffle 13 is located. The rotating shaft where the baffle 13 is located is a damping rotating shaft. By rotating the baffle 13 with the handle 14, the opening size of the air inlet pipe can be controlled to control the air intake effect.

[0025] The furnace body 1 has an ash discharge chamber 15 at the lower end of the combustion chamber 3. The ash discharge chamber 15 can collect the ash after combustion in the combustion chamber 3 and wait for it to be discharged.

[0026] Both the inlet pipe 7 and the outlet pipe 8 are fixedly equipped with connecting flanges at one end; the connecting flanges can be used to easily connect the inlet pipe 7 and the outlet pipe 8 to the pump body and the heat exchange water source.

[0027] When using this device, the blower 10 extracts the flue gas generated inside the furnace 1 during operation. After the flue gas is extracted, it immediately enters the diversion pipe 6 in the first heat exchange mechanism, causing the flue gas to be diverted. At this time, the heat exchange water source can be injected through the liquid inlet pipe 7. Then the water flows through the space between the fixed plates 5 and is discharged from the liquid outlet pipe 8. In this way, the heat exchange water source and multiple diversion pipes 6 can be fully contacted to exchange the heat of the flue gas in the separation pipe to generate hot water, thus completing one heat recovery cycle.

[0028] The flue gas from the subsequent heat recovery enters the heat exchange tube 11. Since the air inlet pipe 12 is fitted onto the outer surface of the heat exchange tube 11, and since oxygen is required for combustion in the heat dissipation chamber, the air inlet pipe 12 can control the supply of air to the combustion chamber 3 in real time. This air supplied to the combustion chamber 3 through the air inlet pipe 12 can contact the heat exchange tube 11, thus increasing the temperature of the air supplied to the combustion chamber 3 by the heat exchange tube 11. This effectively prevents a decrease in boiler thermal efficiency caused by low inlet air temperature in winter, where the cold air needs to absorb more heat to reach combustion temperature. For every 5°C decrease in inlet air temperature, the thermal efficiency may decrease by 0.12%. Therefore, the heat from the exhaust flue gas can be further utilized to improve the thermal efficiency of the combustion chamber 3.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flue gas waste heat recovery device of a holding furnace, comprising a furnace body (1), characterized in that: The furnace body (1) has a heating chamber (2) at the upper end and a combustion chamber (3) at the lower end of the heating chamber (2). The furnace body (1) has a flue gas outlet (4) at the upper end and a connecting pipe (16) at the upper end of the flue gas outlet (4). The connecting pipe (16) has a first heat exchange mechanism for exchanging the heat of the flue gas. The first heat exchange mechanism includes a fixed plate (5), a diversion pipe (6), a liquid inlet pipe (7), and a liquid outlet pipe (8). Fixed plates (5) are fixedly installed on both sides of the connecting pipe (16). Several diversion pipes (6) are evenly fixed between the fixed plates (5). A liquid inlet pipe (7) is fixedly installed at the lower end of the connecting pipe (16), and a liquid outlet pipe (8) is fixedly installed at the upper end of the connecting pipe (16).

2. A flue gas waste heat recovery device for a holding furnace according to claim 1, characterized in that: An extension pipe (9) is fixedly installed at the lower end of the connecting pipe (16). A blower (10) is fixedly installed at the end of the extension pipe (9) away from the connecting pipe (16). A smoke exhaust pipe (17) is fixedly installed on one side of the surface of the blower (10). The blower (10) and the extension pipe (9) are internally connected to each other. The air outlet of the blower (10) is internally connected to the smoke exhaust pipe (17).

3. The waste heat recovery device for flue gas of a heat preservation furnace according to claim 2, characterized in that: The surface of the extension tube (9) is provided with a second heat exchange mechanism for further heat exchange. The second heat exchange mechanism includes a heat exchange tube (11) and an air inlet tube (12). The heat exchange tube (11) is fixedly provided in the middle of the extension tube (9). Several heat exchange fins are uniformly fixedly provided on the outer surface of the heat exchange tube (11). An air inlet tube (12) is fixedly provided on one side of the combustion chamber (3). The air inlet tube (12) is sleeved on the outer surface of the heat exchange tube (11).

4. The waste heat recovery device for flue gas of a heat preservation furnace according to claim 3, characterized in that: One end of the air inlet pipe (12) is movably provided with a baffle (13) via a rotating shaft. A handle (14) is fixedly provided at the upper end of the rotating shaft where the baffle (13) is located. The rotating shaft where the baffle (13) is located is a damping rotating shaft.

5. The waste heat recovery device for flue gas of a heat preservation furnace according to claim 1, characterized in that: The furnace body (1) has an ash discharge chamber (15) located at the lower end of the combustion chamber (3).

6. The waste heat recovery device for flue gas of a heat preservation furnace according to claim 1, characterized in that: Both the inlet pipe (7) and the outlet pipe (8) are fixedly equipped with connecting flanges at one end.

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