Dangerous waste recycling tail gas freezing and drying tower

Abstract

The utility model discloses a hazardous waste recycling tail gas freezing and drying tower, which relates to the technical field of tail gas treatment equipment and comprises a steel frame support arranged on the freezing and drying tower, the steel frame support divides the freezing and drying tower into a first-section tower body and a second-section tower body, and a ship-shaped ash bucket is arranged at the bottom of the freezing and drying tower and communicated with the first-section tower body and the second-section tower body. The bottom of the ship-shaped ash bucket is of an inclined structure, the higher section is communicated with the two sections of the tower body, and the lower section is communicated with the first section of the tower body. The ship-shaped ash bucket is arranged, so that flue gas flows more sufficiently, and the dangerous waste resource cold drying tower is good in fluidity.

Description

Technical Field

[0001] This utility model relates to the technical field of exhaust gas treatment equipment, and in particular to a tail gas cooling and drying tower for hazardous waste resource recovery. Background Technology

[0002] In the process of hazardous waste resource utilization, quench towers are often used to rapidly cool flue gas to prevent the production of dioxins, and dry deacidification towers are used after the quench towers to remove acidic gases from the flue gas. However, the traditional combination of quench towers and dry deacidification towers often suffers from problems such as severe ash accumulation in the connecting flue, difficulty in ash removal, and poor deacidification effect, which seriously affects the continuity of production.

[0003] In the prior art, the composite evaporative cooling and drying combined closed-loop cooling tower disclosed in patent publication number CN116086211A includes a water collector and an outer protective barrel. The outer protective barrel is located on top of the water collector. Positioning rings are provided on the top of the water collector and the bottom outer wall of the outer protective barrel. A mesh barrel is fixed to the opposite side walls of the two positioning rings. A heat dissipation device is fixed to the inner wall of the outer protective barrel. The medium coil includes a medium inlet and a medium outlet. In contrast, this invention uses atomizing nozzles at the top of a disc-shaped spray pipe to spray water onto the bottom outer wall of the first disc-shaped wet cooling section evaporator, cooling the hot medium passing through it. Atomizing nozzles at the bottom of the disc-shaped spray pipe spray water onto the top outer wall of the second disc-shaped wet cooling section evaporator, cooling the hot medium passing through it. However, this comparative technology suffers from poor flue gas flow and low overall efficiency. Utility Model Content

[0004] The purpose of this invention is to address the poor ash removal performance of existing cold drying towers. This invention features a twin-shaft screw feeder to crush large pieces of flue gas ash. A double-layer counterweight flap valve connected below the twin-shaft screw feeder effectively reduces cold air intrusion. Several cleaning holes are arranged on both sides of the boat-shaped ash hopper for easy cleaning. The upward angle of the quicklime nozzles increases the mixing time with the flue gas and improves the acid removal effect. This provides a cold drying tower for hazardous waste resource recovery with excellent ash removal performance.

[0005] Another objective of this invention is to address the poor flue gas flow of existing cold drying towers. This invention features a boat-shaped ash hopper, which allows for more complete flue gas flow, thus providing a cold drying tower for hazardous waste resources with good flowability.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a hazardous waste resource recovery tail gas cooling tower, including a steel frame support on the cooling tower, the steel frame support dividing the cooling tower into a first tower body and a second tower body, a boat-shaped ash hopper at the bottom of the cooling tower, the boat-shaped ash hopper connecting the first tower body and the second tower body, the bottom of the boat-shaped ash hopper having an inclined structure, the higher section connecting to the second tower body, and the lower section connecting to the first tower body.

[0007] Preferably, a twin-screw feeder is connected below the boat-shaped ash hopper, and the twin-screw feeder is installed inside the second-stage tower.

[0008] Preferably, a double-layer counterweight flap valve is connected to the other side of the twin-shaft screw feeder.

[0009] Preferably, one side of the two-stage tower body is equipped with a lime slaked nozzle, which removes acidic gases from the flue gas.

[0010] Preferably, the quicklime nozzle is placed facing upwards.

[0011] As a preferred option, a manhole is provided at the top of the refrigerated drying tower, through which flue gas enters the refrigerated drying tower.

[0012] As a preferred option, a quenching spray gun is installed on one side of the manhole to cool the flue gas, which then enters the second-stage tower body through the boat-shaped ash hopper.

[0013] Preferably, the angle between the inclined structure at the bottom of the boat-shaped ash hopper and the horizontal plane is between 5° and 20°.

[0014] As a preferred option, the refrigeration tower is an integrated structure.

[0015] As a preferred option, several cleaning holes are arranged on both sides of the boat-shaped ash hopper.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: By setting up a twin-shaft screw feeder, this utility model can effectively crush large pieces of flue ash, solving the problem of poor ash removal performance of existing cold drying towers. The double-layer counterweight flap valve connected below the twin-shaft screw feeder can reduce the intrusion of cold air and avoid interference of cold air on the ash removal process. The ash removal holes arranged on both sides of the boat-shaped ash hopper facilitate the ash removal operation. The angle of the quicklime nozzle is upward, which increases the mixing time with the flue gas and the deacidification effect, thus providing a hazardous waste resource recovery tail gas cold drying tower with good ash removal effect. This utility model is equipped with a boat-shaped ash hopper, which makes the flow of flue gas in the cold drying tower more complete. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0018] Figure 2 This is an enlarged view of a partial structure of the present invention, shown in Figure C.

[0019] In the diagram: 1. First section of tower body; 2. Second section of tower body; 3. Manhole; 4. Quenching spray nozzle; 5. Boat-shaped ash hopper; 6. Ash cleaning hole; 7. Double-layer counterweight flap valve; 8. Twin-shaft screw feeder; 9. Slaked lime nozzle; 10. Steel frame support; 11. Cooling tower. Detailed Implementation

[0020] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. The described embodiments are only some embodiments of this utility model, and not all embodiments.

[0021] Example 1: Refer to Figures 1 to 2 In this embodiment, the refrigerated drying tower 11 is provided with a sturdy steel frame support 10. This steel frame support 10 not only plays a role in bearing load, but also divides the refrigerated drying tower 11 into a tower body 1 and a tower body 2, so that the internal space of the entire tower body is reasonably and effectively divided, creating favorable conditions for the subsequent exhaust gas treatment process.

[0022] At the bottom of the refrigerated drying tower 11, the boat-shaped ash hopper 5 is a brilliant design element. The boat-shaped ash hopper 5 not only connects the first section of the tower 1 and the second section of the tower 2, but its bottom also features a sloping structure, with the higher section connected to the second section of the tower 2 and the lower section connected to the first section of the tower 1. This design, combined with the twin-shaft screw feeder 8 and the double-layer counterweight flap valve 7 used below the boat-shaped ash hopper 5, allows for precise adjustment of the spray angle of the quicklime nozzles 9, effectively reducing ash accumulation points and thus lowering construction costs at the source. Simultaneously, during production operation, it significantly reduces the labor intensity of workers, improves the reliability of production operation, and completely eliminates the ash accumulation phenomenon commonly found in traditional flues, providing a solid guarantee for the smooth operation of exhaust gas treatment.

[0023] Looking further, the twin-screw feeder 8 connected below the boat-shaped ash hopper 5 is cleverly positioned within the second-stage tower body 2. As an ash discharge device, the twin-screw feeder 8 can easily crush large pieces of flue ash, effectively avoiding blockages caused by excessively large ash pieces. This ensures the continuity and stability of the entire exhaust gas treatment process, creating favorable conditions for subsequent processes such as acid removal, and further improving the overall system's operating efficiency and treatment effect.

[0024] On the other side of the twin-shaft screw feeder 8 is a double-layer gravity-operated flap valve 7, a design that also embodies ingenious ingenuity. The double-layer gravity-operated flap valve 7 utilizes gravity for automatic ash discharge. During the ash discharge process, the first flap valve automatically closes after completing its task, a feature that significantly reduces the intake of cold air. As is well known, excessive intake of cold air can affect the temperature balance and chemical reaction efficiency of the exhaust gas treatment. The application of the double-layer gravity-operated flap valve 7 effectively avoids this problem, ensuring that the exhaust gas treatment process takes place in a suitable environment, which helps improve the efficiency and quality of reactions such as deacidification, further optimizing the overall performance of the exhaust gas treatment.

[0025] On one side of the second-stage tower 2, the arrangement of the slaked lime nozzles 9 plays a crucial role in acid removal. The slaked lime nozzles 9 can precisely inject slaked lime into the flue gas, effectively removing acidic gases such as sulfur dioxide, sulfur trioxide, hydrogen chloride, and hydrogen fluoride through a chemical reaction. This acid removal process is of great significance for reducing exhaust gas pollution and protecting the atmospheric environment, and is an indispensable and important link in the entire hazardous waste resource recovery exhaust gas treatment system.

[0026] The slaked lime nozzle 9 is positioned upwards with an angled spray, allowing the slaked lime particles to fall freely under gravity. This design extends the mixing time between the slaked lime and the flue gas, significantly improving the deacidification effect. The longer mixing time ensures sufficient contact between the slaked lime and the acidic gases, resulting in a more complete chemical reaction and effectively increasing the removal rate of acidic gases from the exhaust gas. This further reduces the environmental impact of exhaust emissions, aligning with environmental protection requirements and the concept of sustainable development.

[0027] The manhole 3 at the top of the refrigeration tower 11 also plays a crucial role. Flue gas can enter the refrigeration tower 11 through the manhole 3, which facilitates its opening and closing, allowing workers to easily inspect, maintain, and repair the equipment. Simultaneously, the structural design of the manhole 3 ensures its airtightness during normal use, preventing flue gas leakage and protecting the safety of operators and the quality of the surrounding environment.

[0028] Example 2: Refer to Figures 1 to 2 In the design of the refrigerated drying tower 11, the sturdy steel frame support 10 is a crucial foundational component. This steel frame support 10 not only bears the weight of the entire tower body, ensuring the stability and safety of the equipment during operation, but also divides the refrigerated drying tower 11 into a first tower section 1 and a second tower section 2. This division allows for a rational and effective allocation of the internal space of the tower, creating highly favorable conditions for subsequent exhaust gas treatment processes. The division into first tower section 1 and second tower section 2 makes the flow path of exhaust gas within the tower clearer, allowing different treatment processes to be carried out efficiently in their respective independent spaces, thereby improving the efficiency and effectiveness of the entire exhaust gas treatment system.

[0029] The boat-shaped ash hopper 5, located at the bottom of the refrigerated drying tower 11, is a highlight of the entire design. The boat-shaped ash hopper 5 not only structurally connects the first section of the tower 1 and the second section of the tower 2, but also features a sloping bottom design, with the higher section connected to the second section of the tower 2 and the lower section connected to the first section of the tower 1. This design layout not only facilitates the smooth flow of flue gas within the tower but also, in conjunction with the twin-shaft screw feeder 8 and the double-layer counterweight flap valve 7 used below the boat-shaped ash hopper 5, allows for precise adjustment of the spray angle of the quicklime nozzles 9. By precisely controlling the spray angle, the number of ash accumulation points is effectively reduced, thereby lowering construction costs at the source. Simultaneously, during production operation, it significantly reduces the labor intensity of workers, improves the reliability of production operation, and completely eliminates the ash accumulation phenomenon commonly found in traditional flues, providing a solid guarantee for the smooth operation of exhaust gas treatment.

[0030] The twin-screw feeder 8, connected below the boat-shaped ash hopper 5, is located within the second-stage tower body 2. As an ash discharge device, the twin-screw feeder 8 possesses unique advantages. It can easily crush large pieces of ash, effectively avoiding blockages caused by excessively large ash particles. This characteristic ensures the continuity and stability of the entire exhaust gas treatment process, creating favorable conditions for subsequent processes such as acid removal. In actual operation, the efficient operation of the twin-screw feeder 8 not only improves the system's operating efficiency but also further enhances the overall exhaust gas treatment effect, enabling more thorough purification of the exhaust gas.

[0031] On the other side of the twin-shaft screw feeder 8 is a double-layer gravity-operated flap valve 7, a design that also embodies ingenious ingenuity. The double-layer gravity-operated flap valve 7 utilizes gravity for automatic ash discharge. During the ash discharge process, the first flap valve automatically closes after completing its task. This feature significantly reduces the intake of cold air, effectively preventing the problem of excessive cold air intake affecting the temperature balance and chemical reaction efficiency of the exhaust gas treatment. The application of the double-layer gravity-operated flap valve 7 ensures that the exhaust gas treatment process takes place in a suitable environment, helping to improve the efficiency and quality of reactions such as deacidification, further optimizing the overall performance of the exhaust gas treatment, and enabling the exhaust gas treatment system to operate more stably and efficiently.

[0032] On one side of the second-stage tower 2, the arrangement of the slaked lime nozzles 9 plays a crucial role in acid removal. The slaked lime nozzles 9 can precisely inject slaked lime into the flue gas, effectively removing acidic gases such as sulfur dioxide, sulfur trioxide, hydrogen chloride, and hydrogen fluoride through a chemical reaction. This acid removal process is of great significance for reducing exhaust gas pollution and protecting the atmospheric environment, and is an indispensable part of the entire hazardous waste resource recovery exhaust gas treatment system. Through the efficient injection of the slaked lime nozzles 9, the slaked lime comes into full contact with the acidic gases in the flue gas, undergoing a chemical reaction, thereby effectively reducing the content of acidic gases in the exhaust gas and meeting environmental emission standards.

[0033] The slaked lime nozzle 9 is positioned upwards with an angled spray, allowing the slaked lime particles to fall freely under gravity. This design extends the mixing time between the slaked lime and the flue gas, significantly improving the acid removal efficiency. The longer mixing time ensures sufficient contact between the slaked lime and the acidic gases, resulting in a more complete chemical reaction and effectively increasing the removal rate of acidic gases from the exhaust gas. This further reduces the environmental impact of exhaust emissions, meeting environmental protection requirements and the concept of sustainable development. This ingenious design not only improves acid removal efficiency but also makes the entire exhaust gas treatment system more energy-efficient and environmentally friendly.

[0034] The manhole 3 at the top of the refrigeration tower 11 also plays a crucial role. Flue gas can enter the refrigeration tower 11 through the manhole 3, which facilitates its opening and closing, allowing workers to easily inspect, maintain, and repair the equipment. Simultaneously, the structural design of the manhole 3 ensures its airtightness during normal use, preventing flue gas leakage and protecting the safety of operators and the quality of the surrounding environment. This design makes equipment operation and maintenance more convenient and safer, improving equipment reliability and service life.

[0035] A rapid cooling nozzle 4 is installed on one side of the manhole 3 of the refrigerated drying tower 11. The main function of the rapid cooling nozzle 4 is to rapidly cool the high-temperature flue gas. When the flue gas enters the refrigerated drying tower 11 through the manhole 3, the cooling medium (such as water or cold air) sprayed from the rapid cooling nozzle 4 comes into direct contact with the flue gas, rapidly absorbing the heat in the flue gas and reducing the flue gas temperature to a suitable treatment range. This process not only protects subsequent treatment equipment from high-temperature damage but also creates optimal conditions for subsequent acid removal and dust removal processes. The rapid cooling nozzle 4 is designed with high-efficiency spray technology to ensure uniform atomization of the cooling medium, increasing the contact area with the flue gas and thus improving cooling efficiency. The position and angle of the rapid cooling nozzle 4 are carefully designed to ensure uniform cooling without dead zones, avoiding local overcooling or overheating, and further improving the stability and reliability of the entire system.

[0036] After rapid cooling, the flue gas enters the secondary tower body 2 through the boat-shaped ash hopper 5. The design of the boat-shaped ash hopper 5 is another important innovation of this embodiment. Its bottom adopts an inclined structure, with an angle between 5° and 20° to the horizontal plane. This angle range has been tested and optimized multiple times to achieve optimal ash flow and ash removal efficiency. The inclined structure allows the ash to slide naturally under gravity, reducing the possibility of ash accumulation and lowering the frequency and cost of equipment maintenance. Several cleaning holes 6 are also arranged on both sides of the boat-shaped ash hopper 5. These cleaning holes 6 allow for convenient manual or mechanical cleaning when needed, further ensuring unobstructed flow of the ash hopper and efficient operation of the equipment. The arrangement and number of cleaning holes 6 are rationally designed based on actual working conditions and processing capacity, meeting cleaning requirements while avoiding the impact of excessive holes on the structural strength of the ash hopper.

[0037] The refrigerated drying tower 11 adopts a one-piece structural design, which not only improves the overall integrity and stability of the equipment but also simplifies the installation and maintenance process. The one-piece structure allows for overall optimization during the manufacturing process, ensuring tighter and more reliable connections between components and reducing the risk of failure due to loose connections or leaks. Furthermore, the one-piece structure facilitates equipment transportation and on-site installation, shortening the installation cycle and reducing installation costs. In routine maintenance, the one-piece structure reduces disassembly and reassembly work, improving maintenance efficiency and further reducing operating costs.

[0038] In summary, the hazardous waste resource recovery tail gas cooling tower 11 in this embodiment achieves efficient tail gas treatment and stable equipment operation through the quench spray nozzle 4, the inclined structure design of the boat-shaped ash hopper 5, the integrated structure, and the rational arrangement of the cleaning holes 6. These improvements not only enhance the efficiency and quality of tail gas treatment but also reduce energy consumption and maintenance costs, providing an advanced and reliable tail gas treatment solution for the hazardous waste resource recovery industry.

[0039] For those skilled in the art, the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention.

Claims

1. A hazardous waste resource recovery off-gas cold dry column, characterized in that, The steel frame support is arranged on the cold drying tower, and separates the cold drying tower into a first tower body and a second tower body.

2. The hazardous waste resource recovery tail gas cold drying tower according to claim 1, characterized in that, The ship-shaped hopper is arranged at the bottom of the cold drying tower, and is communicated with the first tower body and the second tower body.

3. The hazardous waste resource recovery tail gas cold drying tower according to claim 2, characterized in that, The ship-shaped hopper is communicated with the second tower body at a higher position, and is communicated with the first tower body at a lower position.

4. The hazardous waste resource utilization tail gas cold drying tower according to claim 1 or 2 or 3, characterized in that, The double-shaft screw feeder is arranged below the ship-shaped hopper and in the second tower body.

5. The hazardous waste resource recovery tail gas cold dry column of claim 4, wherein, The other side of the double-shaft screw feeder is connected with a double-layer heavy hammer flap valve.

6. The hazardous waste resource recovery tail gas cold drying tower according to claim 1 or 5, characterized in that, One side of the second tower body is provided with a slaked lime nozzle.

7. The hazardous waste resource recovery tail gas cold drying tower according to claim 6, characterized in that, The slaked lime nozzle is arranged upward.

8. The hazardous waste resource recovery tail gas cold drying tower according to claim 1 or 7, characterized in that, A manhole door is arranged at the top of the cold drying tower.

9. The hazardous waste resource recovery tail gas cold drying tower according to claim 1 or 7, characterized in that, The flue gas enters the cold drying tower through the manhole door.

10. The hazardous waste resource recovery tail gas cold drying tower according to claim 1 or 7, characterized in that, A quenching lance is arranged at one side of the manhole door. The quenching lance cools the flue gas. The flue gas enters the second tower body through the ship-shaped hopper. The angle between the inclined structure of the bottom of the ship-shaped hopper and the horizontal plane is between 5° and 20°. The cold drying tower is of an integrated structure. A plurality of ash removal holes are arranged at two sides of the ship-shaped hopper.

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