A high-temperature flue gas cooling device

Abstract

The utility model discloses a high temperature flue gas cooling device, including cooling water tank, the top of cooling water tank is equipped with the flue gas tank, and the inside of cooling water tank is equipped with high temperature gas collector pipe, and one side of high temperature gas collector pipe is equipped with low temperature gas collector pipe, and the low temperature gas collector pipe is connected with the flue gas tank through cooling serpentine pipe and is connected with the flue gas tank through cooling water tank one end, and the flue gas tank one side is connected with the induced draft fan through the air inlet, and the inside of air inlet is equipped with filter mechanism, the utility model discloses setting up cooling serpentine pipe in cooling water tank, and adding spiral fin outside the serpentine pipe, and the heat exchange area and turbulence intensity between flue gas and cooling water are increased greatly, and the heat exchange efficiency is improved significantly in the limited space, and the original high temperature flue gas above 600 DEG C can be stably reduced to below 350 DEG C, and the inlet temperature requirement of flue gas detection instrument is satisfied.

Description

Technical Field

[0001] This utility model relates to the field of flue gas detection technology, specifically to a high-temperature flue gas cooling device. Background Technology

[0002] In industries such as glass, ceramics, metallurgy, and cement, the initial flue gas temperature generated by kiln combustion typically reaches 500–700℃. To meet environmental emission regulations, continuous online monitoring of components such as nitrogen oxides, sulfur dioxide, and oxygen in the flue gas is required. However, most mainstream flue gas analysis instruments on the market (such as ultraviolet differential absorption spectrometers and electrochemical sensors) generally require the sample gas temperature to not exceed 350℃, with some high-precision devices even limiting it to below 200℃. Directly introducing high-temperature flue gas into the detection system can easily lead to problems such as sensor thermal damage, optical window coking, and sampling pipeline burnout, not only shortening the equipment's lifespan but also significantly increasing maintenance costs.

[0003] In existing technologies, water-cooled cooling devices are commonly used to pretreat raw flue gas. These devices use a fan to introduce high-temperature flue gas into a metal pipe submerged in cooling water, and utilize the temperature difference between the water and the flue gas to achieve heat exchange, thereby reducing the flue gas temperature to an acceptable range for the measuring instruments (generally ≤350℃).

[0004] However, traditional water-cooled cooling devices have significant technical limitations. First, their internal heat exchange elements mostly use smooth straight tubes, resulting in a very limited effective heat exchange area per unit volume. Furthermore, these devices lack integrated effective flue gas filtration. After cooling, the high-temperature flue gas carries impurities such as dust particles, alkali metal oxides, and tar-like condensates, which are not removed but instead directly enter the subsequent piping system with the airflow. These solid or sticky particles not only deposit on the surface of the induced draft fan impeller, easily causing dynamic imbalance, increased vibration, and reduced efficiency. Utility Model Content

[0005] In view of the problems in the related technologies, this utility model proposes a high-temperature flue gas cooling device to overcome the above-mentioned technical problems existing in the existing related technologies.

[0006] Therefore, the specific technical solution adopted by this utility model is as follows:

[0007] A high-temperature flue gas cooling device includes a cooling water tank, a flue gas box at the top of the cooling water tank, a high-temperature gas collecting pipe inside the cooling water tank, a low-temperature gas collecting pipe on one side of the high-temperature gas collecting pipe, the high-temperature gas collecting pipe and the low-temperature gas collecting pipe being connected by a cooling serpentine pipe, one end of the low-temperature gas collecting pipe passing through the cooling water tank and connected to the flue gas box, and one side of the flue gas box being connected to an induced draft fan through an air inlet, the air inlet having a filter mechanism inside.

[0008] Furthermore, spiral fins are connected to the outside of the cooling serpentine tube.

[0009] Furthermore, the filtration mechanism includes a filter screen installed at the air inlet, a central shaft passing through the middle of the filter screen, the central shaft being rotatably connected to a fixed frame, the fixed frame being connected to the air inlet, a worm gear connected to the central shaft, a worm being meshed with one side of the worm gear, one end of the worm being connected to a connecting rod, one end of the connecting rod passing through the air inlet and being connected to a turntable, and a scraper connected to the central shaft, the scraper abutting against the filter screen.

[0010] Furthermore, the bottom of the air inlet is provided with an opening, and a collection box is connected to the outside of the opening. A sealing cover is connected to one side of the collection box by bolts.

[0011] Furthermore, a flue gas detector interface is provided at the top of the flue gas box.

[0012] Furthermore, the high-temperature gas collection pipe and the low-temperature gas collection pipe are connected to the cooling water tank via a mounting bracket.

[0013] Furthermore, the cooling water tank has an inlet and an outlet on one side.

[0014] The beneficial effects of this utility model are as follows:

[0015] By installing a cooling serpentine tube inside the cooling water tank and adding spiral fins to the outside of the serpentine tube, the heat exchange area and turbulence intensity between the flue gas and cooling water are significantly increased. This significantly improves heat exchange efficiency within a limited space, stably reducing the original high-temperature flue gas (above 600℃) to below 350℃, meeting the inlet temperature requirements of flue gas monitoring instruments. A filter screen is installed inside the air inlet, along with a manual cleaning mechanism consisting of a turntable, worm gear, worm wheel, central shaft, and scraper. Operators only need to periodically rotate the external turntable, which drives the scraper to rotate around the filter screen surface via the worm gear mechanism, easily removing adhering dust. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a front view of a high-temperature flue gas cooling device according to an embodiment of the present utility model;

[0018] Figure 2 This is a side view of a high-temperature flue gas cooling device according to an embodiment of the present utility model;

[0019] Figure 3This is a structural diagram of the internal structure of the cooling water tank of a high-temperature flue gas cooling device according to an embodiment of the present utility model;

[0020] Figure 4 This is a structural diagram of a flue gas cooling device according to an embodiment of the present utility model;

[0021] Figure 5 This is a structural diagram of the filter mechanism of a high-temperature flue gas cooling device according to an embodiment of the present utility model.

[0022] In the picture:

[0023] 1. Cooling water tank; 2. Flue gas box; 3. High-temperature gas collection pipe; 4. Low-temperature gas collection pipe; 5. Cooling serpentine pipe; 6. Air outlet; 7. Exhaust fan; 8. Filtration mechanism; 801. Filter screen; 802. Central shaft; 803. Fixing frame; 804. Worm gear; 805. Worm; 806. Connecting rod; 807. Turntable; 808. Scraper; 9. Spiral fins; 10. Opening; 11. Collection box; 12. Sealing cover; 13. Flue gas detector interface; 14. Mounting bracket; 15. Water inlet; 16. Water outlet. 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] According to an embodiment of the present invention, a high-temperature flue gas cooling device is provided.

[0026] like Figures 1-4As shown, the high-temperature flue gas cooling device according to an embodiment of this utility model includes a cooling water tank 1, a flue gas box 2 at the top of the cooling water tank 1, a high-temperature gas collecting pipe 3 inside the cooling water tank 1, and a low-temperature gas collecting pipe 4 on one side of the high-temperature gas collecting pipe 3. The high-temperature gas collecting pipe 3 and the low-temperature gas collecting pipe 4 are connected by a cooling serpentine pipe 5, so that the high-temperature flue gas can fully exchange heat with the cooling water when flowing through the serpentine path. Spiral fins 9 are connected to the outside of the cooling serpentine pipe 5 to increase the heat exchange surface area, enhance turbulence disturbance, and ensure the cooling effect. Both the high-temperature gas collecting pipe 3 and the low-temperature gas collecting pipe 4 are firmly fixed to the inner wall of the cooling water tank 1 by a mounting bracket 14, which not only prevents the pipe displacement caused by vibration or thermal stress during operation, but also facilitates disassembly and assembly for later maintenance. One end of the low-temperature gas collecting pipe 4 passes through the cooling water tank 1 and is connected to the flue gas box 2. One side of the flue gas box 2 is connected to an induced draft fan 7 through an induced draft port 6. The induced draft fan 7 is used to maintain the negative pressure of the system and drive the flue gas flow. The flue gas chamber 2 is equipped with a flue gas detector interface 13 at its top, which facilitates the insertion of a CEMS (Continuous Emission Monitoring System) probe to achieve continuous, stable, and accurate monitoring of key components such as nitrogen oxides, sulfur dioxide, and oxygen. The cooling water tank 1 has an inlet 15 and an outlet 16 on one side. The inlet 15 is used to connect low-temperature cooling water from an external water source (such as an industrial softened water system, cooling tower, or circulating water pump), and the outlet 16 is used to smoothly discharge the hot water after high-temperature heat exchange.

[0027] like Figures 1-5 As shown, the air inlet 6 is equipped with a filter mechanism 8, which includes a filter screen 801 installed in the air inlet 6. A central shaft 802 passes through the middle of the filter screen 801, and the central shaft 802 is rotatably connected to a fixed frame 803. The fixed frame 803 is connected to the air inlet 6. A worm gear 804 is connected to the central shaft 802, and a worm 805 is meshed with one side of the worm gear 804. A protective shell (not shown in the figure) is installed on the outside of the worm gear 804 and the worm 805. One end of the worm 805 is connected to a connecting rod 806, and one end of the connecting rod 806 passes through the air inlet 6 and is connected to a turntable 807. By setting the worm gear 804 and the worm 805, it can be ensured that the scraper 808 cannot rotate on its own due to the impact of flue gas, vibration or gravity when there is no external driving force, and can always be kept in the set position. Even if the surface of the filter screen 801 has a thick layer of dust and high resistance, it can be cleaned with a small torque, which significantly reduces the intensity of manual operation. A scraper 808 is connected to the central shaft 802, and the scraper 808 abuts against the filter screen 801. An opening 10 is provided at the bottom of the air inlet 6, and a collection box 11 is connected to the outside of the opening 10. A sealing cover 12 is bolted to one side of the collection box 11. Maintenance personnel can easily open and clean the accumulated dust by simply loosening the bolts. The operation is simple, the seal is reliable, and it effectively prevents dust from overflowing and causing secondary pollution or entering the interior of the induced draft fan 7, significantly extending the life of the fan impeller and ensuring long-term stable operation of the system.

[0028] To facilitate understanding of the above-mentioned technical solutions of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below.

[0029] In operation, high-temperature flue gas first enters the high-temperature gas collecting pipe 3 through an external pipe, and then enters the cooling serpentine pipe 5, which is submerged in the cooling water of the cooling water tank 1. Inside the serpentine pipe 5, the flue gas flows along a meandering path, exchanging heat thoroughly with the surrounding low-temperature cooling water. Thanks to the spiral fins 9 on the outer side of the serpentine pipe 5, the heat exchange area is significantly increased, and disturbances are induced between the water flow and the flue gas boundary layer, further enhancing heat transfer efficiency and ensuring that the outlet flue gas temperature is stably reduced to below 350℃. The cooled flue gas is then discharged from the cooling water tank 1 through the low-temperature gas collecting pipe 4 and enters the upper flue gas chamber 2. In this chamber, the airflow velocity tends to be uniform, and some condensed particles or large-diameter dust particles that precipitate due to cooling settle under gravity, preventing them from directly entering downstream equipment. Subsequently, the flue gas flows to the induced draft fan 7 through the induced draft port 6, which maintains the system negative pressure, driving the flue gas to flow continuously and stably throughout the entire pretreatment path. After the flue gas enters the flue gas box 2, the flue gas detection device can be inserted into the flue gas detector interface 13 for continuous and stable detection of the flue gas. Before the flue gas enters the induced draft fan 7, the filtration mechanism 8 intercepts any remaining fine particles. When the dust accumulation on the surface of the filter screen 801 increases and the resistance rises, the maintenance personnel only need to manually rotate the turntable 807 outside the equipment. This will drive the central shaft 802 to rotate slowly through the transmission chain of the connecting rod 806, worm 805, and worm wheel 804, thereby driving the scraper 808 to run circumferentially against the surface of the filter screen 801 and scrape off the attached dust. Thanks to the high reduction ratio and self-locking characteristics of the worm wheel 804 and worm 805 mechanism, this operation is labor-saving and reliable, and the scraper 808 remains fixed when not in operation and will not shift due to airflow disturbance. The scraped dust falls naturally into the collection box 11 through the ash discharge opening 10 at the bottom of the induced draft port 6. When the dust inside the collection box 11 reaches a certain level, it can be cleaned by removing the sealing cover 12. This design not only simplifies the maintenance process but also ensures the long-term stable operation of the system.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-temperature flue gas cooling device, characterized in that, The device includes a cooling water tank (1), a flue gas box (2) at the top of the cooling water tank (1), a high temperature gas collecting pipe (3) inside the cooling water tank (1), a low temperature gas collecting pipe (4) on one side of the high temperature gas collecting pipe (3), the high temperature gas collecting pipe (3) and the low temperature gas collecting pipe (4) are connected by a cooling serpentine pipe (5), one end of the low temperature gas collecting pipe (4) passes through the cooling water tank (1) and is connected to the flue gas box (2), one side of the flue gas box (2) is connected to the induced draft fan (7) through an air inlet (6), and a filter mechanism (8) is provided inside the air inlet (6).

2. The high-temperature flue gas cooling device according to claim 1, characterized in that, The cooling serpentine tube (5) is connected to a spiral fin (9) on its outer side.

3. The high-temperature flue gas cooling device according to claim 1, characterized in that, The filtration mechanism (8) includes a filter screen (801) installed at the air inlet (6). A central shaft (802) is inserted through the middle of the filter screen (801). The central shaft (802) is rotatably connected to a fixed frame (803). The fixed frame (803) is connected to the air inlet (6). A worm gear (804) is connected to the central shaft (802). A worm (805) is meshed with one side of the worm gear (804). One end of the worm (805) is connected to a connecting rod (806). One end of the connecting rod (806) passes through the air inlet (6) and is connected to a turntable (807). A scraper (808) is connected to the central shaft (802). The scraper (808) abuts against the filter screen (801).

4. The high-temperature flue gas cooling device according to claim 1, characterized in that, The air inlet (6) has an opening (10) at the bottom, and a collection box (11) is connected to the outside of the opening (10). A sealing cover (12) is connected to one side of the collection box (11) by bolts.

5. The high-temperature flue gas cooling device according to claim 1, characterized in that, The flue gas box (2) is equipped with a flue gas detector interface (13) at the top.

6. The high-temperature flue gas cooling device according to claim 1, characterized in that, The high-temperature gas collection pipe (3) and the low-temperature gas collection pipe (4) are connected to the cooling water tank (1) through the mounting bracket (14).

7. The high-temperature flue gas cooling device according to claim 1, characterized in that, The cooling water tank (1) has an inlet (15) and an outlet (16) on one side.

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