Safe and efficient dry quenching flue gas dust removal system

Abstract

The utility model discloses a safe and efficient dry quenching flue gas dust removal system, including desulfurizer, filter dust catcher and cloth bag dust remover, and the desulfurizer includes the gas distribution box, inlet box and reaction box who set gradually from below to above, be provided with a plurality of stand pipes between inlet box and reaction box, the lower part of stand pipe is provided with the central tube coaxially, be provided with helical guide vane between central tube and stand pipe, and the lower end of central tube is communicated with gas distribution box after penetrating inlet box, is provided with the flue gas inlet pipe on inlet box, and the bottom of gas distribution box is provided with the flue gas delivery pipe, is provided with the feeding pipe on the flue gas delivery pipe, and the opposite two ends of filter dust catcher are provided with inlet and outlet respectively, and a plurality of pairs of filter screen are arranged in filter dust catcher between inlet and outlet, and the filter dust catcher above filter screen is processed with the opening, and the opening is connected with the sealing cover through bolt, and the outlet is communicated with cloth bag dust remover. Above all, the utility model has the advantages of good dust removal effect, high desulfurization efficiency, convenient filter screen replacement and safe and efficient.

Description

Technical Field

[0001] This utility model relates to the technical field of dry quenching flue gas dust removal equipment, specifically to a safe and efficient dry quenching flue gas dust removal system. Background Technology

[0002] Dry quenching refers to a quenching method that uses inert gas to cool red-hot coke. Due to its high efficiency, energy saving, and environmental friendliness, dry quenching technology is widely used in coking processes, and according to incomplete statistics, it holds over 90% of the market share. A dry quenching system mainly includes a dry quenching furnace, boiler, circulating fan, heat pipe heat exchanger, and lower coke discharge chute. During the dry quenching process, a large amount of flue gas containing dust particles is generated in the dry quenching furnace, at the circulating fan vent, and in the coke discharge chute. Dust is a major air pollutant, and the flue gas also contains a certain amount of sulfur dioxide, a corrosive gas that strongly damages the boiler's heating surfaces, affecting the safe operation of the entire system. Therefore, a dry quenching flue gas dust removal system is required to purify the gas discharged from the dry quenching device and ensure it meets emission standards.

[0003] Existing dry quenching flue gas dust removal systems often fail to achieve satisfactory purification results, frequently exhibiting incomplete or ineffective dust filtration. This results in the exhaust gas still containing a significant amount of dust particles. Furthermore, the desulfurization efficiency is low, failing to adequately meet flue gas desulfurization requirements. Secondly, while filters are typically used for dust removal, they are prone to clogging and damage, leading to reduced filtration efficiency. Cleaning and replacing these filters is often cumbersome, time-consuming, and labor-intensive. Therefore, developing a safe and efficient dry quenching flue gas dust removal system with superior dust removal performance, high desulfurization efficiency, and convenient filter replacement is objectively necessary. Utility Model Content

[0004] The purpose of this utility model is to provide a safe and efficient dry quenching flue gas dust removal system with good dust removal effect, high desulfurization efficiency, and convenient filter replacement.

[0005] The purpose of this utility model is achieved as follows: it includes a desulfurizer, a dust filter, and a bag filter. The desulfurizer includes a gas distribution box, an air inlet box, and a reaction box arranged sequentially from bottom to top. Several vertical pipes are arranged between the air inlet box and the reaction box. A central pipe is coaxially arranged at the lower part of the vertical pipe. A spiral guide plate is arranged between the central pipe and the vertical pipe. The lower end of the central pipe passes through the air inlet box and connects to the gas distribution box. An inlet pipe is arranged on the air inlet box. A flue gas delivery pipe is arranged at the bottom of the gas distribution box. A feed pipe is arranged on the flue gas delivery pipe. An air inlet and an air outlet are respectively arranged at opposite ends of the dust filter. Multiple pairs of filter screens are arranged at intervals inside the dust filter between the air inlet and the air outlet. An opening is machined on the dust filter above the filter screen. A sealing cap is connected to the opening by bolts. The air outlet is connected to the bag filter.

[0006] Furthermore, the mesh size of each pair of filters gradually decreases along the airflow direction.

[0007] Furthermore, a cyclone dust collector is installed on the outside of the desulfurizer, and the outlet of the cyclone dust collector is connected to the flue gas inlet pipe and the flue gas delivery pipe through pipelines.

[0008] Furthermore, a spindle is installed in the upper part of the vertical tube, and several turbulence plates are arranged on the spindle at intervals.

[0009] Furthermore, a rotating shaft is installed inside the reaction chamber, and a stirring blade is installed on the rotating shaft. The upper end of the rotating shaft extends out of the reaction chamber and is connected to a motor for transmission.

[0010] Furthermore, the top of the dust filter is equipped with an escape cover, and process holes are machined on the escape cover opposite the filter screen. A return pipe is installed on the escape cover, and an exhaust fan is installed on the return pipe. The end of the return pipe is connected to the air inlet box.

[0011] Furthermore, a rotating shaft is installed inside the flue pipe above the feeding pipe. The rotating shaft is fixed to the side wall of the flue pipe by a connecting rod. One end of the rotating shaft is equipped with a fan blade, and the other end is equipped with a material distribution plate.

[0012] Furthermore, positioning rings are installed inside the dust collectors on both sides of the filter screen.

[0013] In operation, the dry quenching flue gas is divided into two streams. One stream enters the inlet box through the inlet pipe, and the other stream enters the distribution box through the delivery pipe. Simultaneously, powdered absorbent is added to the delivery pipe through the feeding pipe. The absorbent can be limestone, sodium bicarbonate, etc., as needed. The absorbent is entrained by the flue gas and fully mixed with it before entering the distribution box together. Then, it is sprayed into the vertical pipe through the central pipe. At the same time, the flue gas in the inlet box enters the annular area between the central pipe and the vertical pipe. A spiral guide plate is installed in this area. Under the action of the spiral guide plate, the flue gas forms a swirling flow and mixes with the mixed gas sprayed from the central pipe. The mixture is then spiraled upwards within the vertical pipe, where the absorbent reacts fully with the sulfur dioxide in the flue gas. The flue gas then enters the reaction chamber, where its large volume slows its flow rate. The flue gas and absorbent further mix, contact, and react within the chamber, achieving desulfurization. The desulfurized flue gas is then sent to a dust collector, where multiple pairs of filters remove dust particles and impurities. Finally, a baghouse dust collector thoroughly removes the dust, ensuring the flue gas meets emission requirements, thus completing the desulfurization and dust removal process. In this invention, a dry desulfurization method is employed. The flue gas fully contacts and reacts with the absorbent in the vertical pipe and reaction chamber, rapidly and efficiently removing sulfur dioxide from the flue gas. This method boasts high desulfurization efficiency, effectively meeting flue gas desulfurization requirements and preventing corrosion of boiler heating surfaces by sulfur dioxide, thus ensuring the safe operation of the entire system. Secondly, the system incorporates a dust filter and a baghouse dust collector. The dust filter contains multiple filter screens, which initially remove large particulate impurities from the flue gas, reducing the workload of the subsequent baghouse dust collector, extending its operating cycle, and improving the flue gas dust removal efficiency. The flue gas, after initial dust removal, enters the baghouse dust collector for final dust removal. Through this staged dust removal process, a good dust removal and purification effect is achieved, resulting in a more thorough purification. This invention effectively removes dust and impurities from flue gas. Furthermore, the dust collector incorporates multiple pairs of filters. In actual use, only one filter needs to be installed in each pair, leaving the other unused. When the filter becomes clogged after a period of system operation, reducing filtration efficiency and increasing system resistance due to filter clogging, the sealing cover at the unused filter location can be opened, a new filter installed, and the sealing cover replaced. Then, the sealing cover at the clogged filter location can be opened, the clogged filter removed, and the sealing cover replaced. The clogged filter can then be cleaned or replaced. Filter installation and removal are convenient and can be performed when the system is shut down. If necessary, it can also be performed online. However, considering that some flue gas may escape after removing the sealing cover, appropriate safety precautions should be taken. In summary, this invention offers advantages such as good dust removal effect, high desulfurization efficiency, convenient filter replacement, and safety and high efficiency. Attached Figure Description

[0014] Figure 1This is a schematic diagram of the overall structure of this utility model; Figure 2 for Figure 1 A magnified structural diagram of node A in the middle; Figure 3 for Figure 1 A magnified structural diagram of node B in the middle; Figure 4 for Figure 1 A magnified structural diagram of node C in the middle; In the diagram: 1-Dust filter, 2-Bag dust collector, 3-Gas distribution box, 4-Inlet box, 5-Reaction box, 6-Vertical pipe, 7-Central pipe, 8-Spiral guide plate, 9-Smoke inlet pipe, 10-Smoke delivery pipe, 11-Feeding pipe, 12-Filter screen, 13-Sealing cover, 14-Cyclone dust collector, 15-Baffle plate, 16-Agitator blade, 17-Motor, 18-Escape shield, 19-Process hole, 20-Return pipe, 21-Fan blade, 22-Distribution plate, 23-Positioning ring. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings, but this description is not intended to limit the present invention in any way. Any changes or improvements made based on the present invention shall fall within the protection scope of the present invention.

[0016] like Figures 1-4 As shown, this utility model includes a desulfurizer, a dust collector 1, and a bag filter 2. The desulfurizer includes a gas distribution box 3, an air inlet box 4, and a reaction box 5 arranged sequentially from bottom to top. Several vertical pipes 6 are arranged between the air inlet box 4 and the reaction box 5. A central pipe 7 is coaxially arranged at the lower part of the vertical pipe 6. A spiral guide plate 8 is arranged between the central pipe 7 and the vertical pipe 6. The lower end of the central pipe 7 passes through the air inlet box 4 and communicates with the gas distribution box 3. An inlet pipe 9 is arranged on the air inlet box 4. A smoke delivery pipe 10 is arranged at the bottom of the gas distribution box 3. A feeding pipe 11 is arranged on the smoke delivery pipe 10. An air inlet and an air outlet are respectively arranged at opposite ends of the dust collector 1. Multiple pairs of filter screens 12 are arranged at intervals in the dust collector 1 between the air inlet and the air outlet. An opening is processed on the dust collector 1 above the filter screen 12. A sealing cover 13 is connected to the opening by bolts. The air outlet communicates with the bag filter 2.

[0017] In operation, the dry quenching flue gas is divided into two streams. One stream enters the inlet box 4 through the inlet pipe 9, and the other stream enters the distribution box 3 through the delivery pipe 10. Simultaneously, powdered absorbent is added to the delivery pipe 10 through the feeding pipe 11. The absorbent can be limestone, sodium bicarbonate, etc., as needed. The absorbent is entrained by the flue gas and fully mixed with it before entering the distribution box 3 together. Then, it is sprayed into the vertical pipe 6 through the central pipe 7. At the same time, the flue gas in the inlet box 4 enters the annular area between the central pipe 7 and the vertical pipe 6. A spiral guide plate 8 is set in this area. Under the action of the spiral guide plate 8, the flue gas forms a swirling flow and interacts with the flue gas sprayed from the central pipe 7. The mixed gas is then spiraled upward in the vertical pipe 6. During the flow, the absorbent reacts fully with the sulfur dioxide in the flue gas. The flue gas then enters the reaction chamber 5. Due to the large volume of the reaction chamber 5, the flow rate of the flue gas slows down after entering it. The flue gas and absorbent are further mixed, contacted, and reacted in the reaction chamber to achieve the purpose of desulfurization. The desulfurized flue gas is sent to the dust filter 1, where multiple pairs of filter screens 12 are used to remove dust from the flue gas, initially removing larger dust particles and impurities. Then, the bag filter 2 is used to thoroughly remove dust from the flue gas, so that the flue gas meets the emission requirements, thus completing the desulfurization and dust removal of the flue gas.

[0018] In this invention, a dry desulfurization method is used. The flue gas fully contacts and reacts with the absorbent in the vertical pipe 6 and reaction chamber 5, rapidly and efficiently removing sulfur dioxide from the flue gas. This method has high desulfurization efficiency, effectively meeting the flue gas desulfurization requirements and preventing corrosion of boiler heating surfaces and pipes by sulfur dioxide, ensuring the safe operation of the entire system. Secondly, the system includes a dust filter 1 and a bag filter 2. The dust filter 1 contains multiple filter screens 12, which can initially filter out large particulate impurities in the flue gas, reducing the workload of the subsequent bag filter 2, extending its operating cycle, and improving the flue gas dust removal efficiency. The flue gas after initial dust removal is then passed into the bag filter 2 for final dust removal. Through staged dust removal, a good dust removal and purification effect is achieved, thoroughly removing dust and particulate matter from the flue gas. Impurities are thoroughly removed. Furthermore, this invention incorporates multiple pairs of filters within the dust collector 1. In actual use, only one filter 12 needs to be installed in each pair, leaving the other filter 12 unused. When the system runs for a period and the filter 12 becomes clogged, reducing filtration efficiency and increasing system operating resistance due to filter 12 clogging, the sealing cover 13 at the unused filter 12 position can be opened, a new filter 12 installed, and the sealing cover 13 reinstalled. Subsequently, the sealing cover 13 at the clogged filter 12 position can be opened, the clogged filter 12 extracted, and the sealing cover 13 reinstalled. The clogged filter 12 can then be cleaned or replaced. The disassembly and assembly of the filter 12 are relatively convenient. The above operations can be performed when the system is stopped, or online if necessary. However, considering that some fumes will escape after removing the sealing cover 13, appropriate safety precautions should be taken.

[0019] The mesh size of each pair of filter screens 12 gradually decreases along the airflow direction. The mesh diameter of each pair of filter screens 12 is the same, but the mesh size of each pair of filter screens 12 is different. In this utility model, the mesh size of the filter screens 12 through which the flue gas flows gradually decreases, which can first filter out larger dust particles in the flue gas, and then filter out dust particles that gradually decrease in size in the flue gas in sequence, so as to achieve graded filtration of dust and improve filtration efficiency.

[0020] A cyclone dust collector 14 is installed on the outside of the desulfurizer. The outlet of the cyclone dust collector 14 is connected to the flue gas inlet pipe 9 and the flue gas delivery pipe 10 through pipelines. The dry quenching flue gas contains a lot of dust, including a lot of large dust particles. The presence of these large dust particles will undoubtedly affect the subsequent desulfurization effect. The cyclone dust collector 14 can remove the large dust impurities in the flue gas first, which can improve the desulfurization effect and reduce the filtration load of the subsequent dust filter 1.

[0021] A mandrel is installed at the upper part of the vertical pipe 6, and several turbulence baffles 15 are arranged at intervals on the mandrel. The flue gas and absorbent flow spirally from bottom to top in the vertical pipe 6. During this process, the flue gas and absorbent are constantly mixed and reacted, and the two are in a spiral flow state, which has a longer contact time and improves the desulfurization efficiency. The turbulence baffles 15 are set in the vertical pipe 6. When the flue gas flows, it will impact the turbulence baffles 15, thereby generating turbulence, which can break the inherent flow state of the flue gas and promote the contact and reaction between sulfur dioxide in the flue gas and the absorbent.

[0022] A rotating shaft is installed inside the reaction chamber 5, and a stirring blade 16 is installed on the rotating shaft. The upper end of the rotating shaft extends out of the reaction chamber 5 and is connected to a motor 17. When the motor 17 is started, the motor 17 drives the rotating shaft to rotate, and the rotating shaft drives the stirring blade 16 to rotate. During operation, flue gas enters the reaction chamber 5 from the upper ends of several vertical pipes 6 at the same time. The rotating stirring blade 16 can cut off the flue gas flow from each vertical pipe 6 and drive the flow to rotate, promoting the mutual mixing between the flue gas and thus promoting the contact and reaction between sulfur dioxide and absorbent in the flue gas, improving the desulfurization efficiency of the flue gas and having a better desulfurization effect.

[0023] The top of the dust filter 1 is equipped with an escape cover 18. A process hole 19 is machined on the escape cover 18 corresponding to the filter screen 12. A return pipe 20 is installed on the escape cover 18, and an exhaust fan is installed on the return pipe 20. The end of the return pipe 20 is connected to the air inlet box 4. During operation, as the operating time increases, the filter screen 12 may become clogged and damaged, requiring cleaning or replacement. At this time, the corresponding sealing cover 13 needs to be opened to remove or install the filter screen 12. During this process, the dust filter 1... Some of the flue gas will inevitably escape from the opening, polluting the surrounding environment. To avoid environmental pollution, an escape shield 18 is installed. The escape shield 18 is attached to the top of the dust filter 1. When in use, the exhaust fan is turned on, and the exhaust fan draws the gas inside the escape shield 18, making the inside of the escape shield 18 negative pressure. When the flue gas escapes from the opening and enters the escape shield 18, it can be promptly drawn to the return pipe 20, thereby preventing the flue gas from escaping to the surrounding environment and causing pollution. The extracted flue gas is then sent to the air inlet box 4 through the return pipe 20 for further purification.

[0024] A rotating shaft is installed inside the flue gas supply pipe 10 above the feeding pipe 11. The rotating shaft is fixed to the side wall of the flue gas supply pipe 10 by a connecting rod. One end of the rotating shaft is equipped with a fan blade 21, which is existing technology. When the airflow passes through, it can drive the fan blade 21 to rotate. The other end is equipped with a material distribution plate 22. The rotating shaft can rotate freely. When the flue gas flows through the fan blade 21, it will blow the fan blade 21 to rotate, which in turn drives the rotating shaft to rotate, and then drives the material distribution plate 22 to rotate. When the flue gas flow carries the absorbent to the material distribution plate 22, the material distribution plate 22 will disperse the absorbent, so that the absorbent is evenly dispersed in the flue gas.

[0025] Positioning rings 23 are provided inside the dust collectors 1 on both sides of the filter screen 12. When the system is running, the filter screen 12 is inserted into the dust collector 1 through the opening. As the running time increases, the filter screen 12 may deform or warp. In addition, since there may be a certain gap between the edge of the filter screen 12 and the inner wall of the dust collector 1, some flue gas may flow directly through without being filtered, which will affect the filtration effect of the flue gas. To solve the above problems, positioning rings 23 are set. The positioning rings 23 are fixed on the inner wall of the dust collector 1, and the filter screen 12 is inserted into the gap between the two positioning rings 23. On the one hand, it can position and limit the filter screen 12 to prevent the filter screen 12 from deforming or warping due to long-term impact of airflow. On the other hand, the positioning rings 23 can also block the flue gas, so that the flue gas can be filtered by the filter screen 12.

[0026] In practical use, a sealing gasket can be installed between the sealing cover 13 and the outer wall of the dust collector 1 to improve the sealing performance and prevent the flue gas inside the dust collector 1 from escaping through the gap between the sealing cover 13 and the outer wall of the dust collector 1. To facilitate the removal of the filter screen 12 from the opening and for easy hoisting of the filter screen 12, a lifting ring can be installed at the upper end of the filter screen 12. Additionally, a steam pipe can be installed on the flue gas supply pipe 10 below the feeding pipe 11 to introduce an appropriate amount of steam or water mist into the flue gas supply pipe 10, thereby increasing the humidity of the flue gas. The moisture will be adsorbed onto the surface of the absorbent particles, forming a very thin liquid film. This liquid film can dissolve sulfur dioxide, making it easier for sulfur dioxide to transfer from the gas phase to the liquid phase and then contact the absorbent. Simultaneously, this liquid film can also dissolve the absorbent, causing partial dissolution of the absorbent surface and exposing more fresh, reactive sites. This process is called surface activation of the absorbent, which can greatly increase the effective reaction area between sulfur dioxide and the absorbent, thereby improving the desulfurization effect of the flue gas. In addition, spraying in an appropriate amount of water can reduce dust, increase the aggregation and residence time between particles, and make the gas-solid mixture more complete and the contact time longer.

Claims

1. A safe and efficient dry quenching flue gas dust removal system, comprising a desulfurizer, a dust filter (1), and a bag filter (2), characterized in that: The desulfurizer includes a gas distribution box (3), an air inlet box (4), and a reaction box (5) arranged sequentially from bottom to top. Several vertical pipes (6) are arranged between the air inlet box (4) and the reaction box (5). A central pipe (7) is coaxially arranged at the lower part of the vertical pipe (6). A spiral guide plate (8) is arranged between the central pipe (7) and the vertical pipe (6). The lower end of the central pipe (7) passes through the air inlet box (4) and communicates with the gas distribution box (3). A flue gas inlet pipe (9) is arranged on the air inlet box (4). The bottom of the air distribution box (3) is provided with a smoke supply pipe (10), and a feeding pipe (11) is provided on the smoke supply pipe (10). The dust filter (1) is provided with an air inlet and an air outlet at opposite ends. Multiple pairs of filter screens (12) are arranged at intervals in the dust filter (1) between the air inlet and the air outlet. An opening is processed on the dust filter (1) above the filter screen (12), and a sealing cover (13) is connected to the opening by bolts. The air outlet is connected to the bag dust collector (2).

2. The safe and efficient dry quenching flue gas dust removal system according to claim 1, characterized in that: The mesh size of each pair of filters (12) gradually decreases along the airflow direction.

3. The safe and efficient dry quenching flue gas dust removal system according to claim 1, characterized in that: A cyclone dust collector (14) is installed on the outside of the desulfurizer. The outlet of the cyclone dust collector (14) is connected to the flue gas inlet pipe (9) and the flue gas delivery pipe (10) through pipelines.

4. The safe and efficient dry quenching flue gas dust removal system according to claim 1, characterized in that: The upper part of the vertical tube (6) is provided with a spindle, and several interference flow plates (15) are arranged on the spindle at intervals.

5. The safe and efficient dry quenching flue gas dust removal system according to claim 1, characterized in that: The reaction chamber (5) is equipped with a rotating shaft, on which a stirring blade (16) is mounted. The upper end of the rotating shaft extends out of the reaction chamber (5) and is connected to a motor (17).

6. The safe and efficient dry quenching flue gas dust removal system according to claim 1, characterized in that: The top of the dust filter (1) is provided with an escape cover (18), and the escape cover (18) corresponding to the filter screen (12) is machined with a process hole (19). The escape cover (18) is provided with a return pipe (20), and a fan is provided on the return pipe (20). The end of the return pipe (20) is connected to the air inlet box (4).

7. The safe and efficient dry quenching flue gas dust removal system according to claim 1, characterized in that: A rotating shaft is provided inside the smoke delivery pipe (10) above the feeding pipe (11). The rotating shaft is fixed to the side wall of the smoke delivery pipe (10) by a connecting rod. One end of the rotating shaft is provided with a fan blade (21), and the other end is provided with a material distribution plate (22).

8. The safe and efficient dry quenching flue gas dust removal system according to claim 1, characterized in that: Positioning rings (23) are provided in the dust collectors (1) on both sides of the filter screen (12).

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