A high efficiency tower for tail gas absorption

Abstract

The utility model discloses a kind of high efficiency towers for tail gas absorption, including tower body, air inlet section, absorption section, mist removal section and air outlet section, tower body is equipped with airflow distributor, spraying device, filler layer and demister inside;Absorbent circulation system is communicated with spraying device and pre-spraying device, realizes absorbent circulation and automatic liquid supplement;Air outlet end is equipped with fan, improves tail gas conveying efficiency.The high efficiency tower improves absorption efficiency by rotating atomizing nozzle and structured packing, adopts modular structure design, is convenient for transportation and maintenance, with automatic control function, applicable to a variety of industrial tail gas treatment scene, with good absorption effect, low energy consumption, reasonable structure, strong adaptability and the like advantages.

Description

Technical Field

[0001] This utility model relates to the field of machinery, specifically to a high-efficiency tower for exhaust gas absorption. Background Technology

[0002] With the continuous advancement of industrialization, industries such as petrochemicals, metal smelting, pharmaceuticals, printing and dyeing, and electroplating emit large amounts of industrial exhaust gases containing harmful components such as acidic gases, volatile organic compounds, and particulate matter during their production processes. These exhaust gases not only pollute the atmospheric environment but also pose a potential threat to human health. In response to increasingly stringent environmental regulations, enterprises generally adopt exhaust gas absorption towers to purify and treat exhaust gases.

[0003] Existing exhaust gas absorption towers mostly adopt packed towers or spray tower structures. Although they can achieve a certain purification effect under specific operating conditions, they still have many problems. First, traditional absorption towers have low gas-liquid contact efficiency, resulting in unsatisfactory absorption efficiency. Second, the tower structure is complex, requiring frequent maintenance and resulting in high operating and management costs. Third, they have poor adaptability to treating exhaust gas with large fluctuations in composition or mixed pollutants, affecting the stability of the system. Fourth, the equipment is large in size and occupies a large area, which poses significant limitations, especially in the renovation projects of old factories. In addition, the mist droplets generated during the exhaust gas absorption process are not easily captured completely, which may cause secondary pollution or equipment corrosion problems.

[0004] Therefore, there is an urgent need for a high-efficiency exhaust gas absorption device that is structurally sound, operates efficiently, consumes little energy, is highly adaptable, and is easy to maintain, in order to improve the exhaust gas purification effect and meet the needs of practical engineering applications. Summary of the Invention

[0005] To solve the above-mentioned technical problems, this utility model provides a high-efficiency tower for exhaust gas absorption.

[0006] This utility model is achieved through the following technical solution:

[0007] This utility model discloses a high-efficiency tower for exhaust gas absorption, comprising:

[0008] The tower body is divided into an air intake section, an absorption section, a demisting section, and an air outlet section from bottom to top, and is formed by one piece.

[0009] An airflow distributor in the shape of a porous circular plate, coaxially and fixedly connected within the intake section;

[0010] Several spray devices and packing layers are arranged in an alternating manner within the absorption section; the spray devices are used to atomize and spray the absorbent, and the packing layers are used to enhance the gas-liquid contact area.

[0011] A demister installed in the demisting section is used to remove mist droplets from the exhaust gas;

[0012] An absorbent circulation system is connected to several of the above-mentioned spray devices; the absorbent circulation system is used to circulate and transport the absorbent liquid to the spray devices.

[0013] A pre-spray device installed inside the air intake section, located at the lower end of the airflow distributor;

[0014] The exhaust gas inlet pipe is connected to the intake section;

[0015] The exhaust pipe is connected to the exhaust section;

[0016] A fan is installed and connected to the exhaust pipe.

[0017] The overall structural layout of the high-efficiency absorption tower embodies the typical "countercurrent absorption" principle, where exhaust gas enters from the bottom of the tower and encounters the absorbent droplets sprayed from top to bottom, achieving full contact. The integrated tower design effectively reduces the risk of leakage at interface joints, improving the overall sealing performance and structural strength of the equipment. The longitudinal segmentation design of the tower follows the gas flow direction, and the function of each segment is optimized to improve overall absorption efficiency and operational stability.

[0018] The airflow distributor ensures that the exhaust gas is evenly distributed upon initial entry into the absorption tower, effectively preventing the formation of local high-speed channels, avoiding the "short-circuit effect," and guaranteeing uniform gas-liquid contact. The staggered arrangement of the spray device and the packing layer helps to form a multi-stage mass transfer interface within the tower, improving absorption efficiency while also extending the residence time of the exhaust gas within the tower.

[0019] The absorbent circulation system ensures the recycling of the absorbent, effectively controlling operating costs. The pre-spray device, installed at the initial stage of gas flow, cools, humidifies, and accelerates the reaction, improving the absorption effect of the gas in subsequent stages. The fan configuration provides the driving force for the exhaust gas flow and is a key component for achieving overall tower airflow.

[0020] Furthermore, the tower body comprises multiple independently formed segment units, each segment unit corresponding to an air inlet section, an absorption section, a demisting section, and an air outlet section. The segment units are detachably connected via flange connections or snap-on quick-connect devices to facilitate transportation, installation, and maintenance. The tower body is made of corrosion-resistant materials, including fiberglass or stainless steel.

[0021] The modular design of the segmented unit aligns with the trends of lightweighting and standardization in modern industrial equipment. This structure significantly enhances the flexibility of the equipment during manufacturing, transportation, and on-site assembly, facilitating future upgrades, expansions, or replacements. The use of flange or snap-fit ​​connections allows for tool-less quick installation and sealing, making it particularly suitable for applications requiring frequent maintenance.

[0022] The tower body uses fiberglass or stainless steel as the main material, which has good corrosion resistance and can withstand long-term corrosion from most acid and alkali absorbents, extending its service life and reducing maintenance costs. Meanwhile, fiberglass is lightweight and easy to install, while stainless steel is more suitable for high-temperature and high-pressure environments. The choice between the two can be made based on the specific application.

[0023] Furthermore, the aforementioned airflow distributor is a porous circular plate with radially distributed through holes, and a turbulence structure is provided on its surface or below. The turbulence structure includes several guide vanes or raised ribs arranged in a spiral or arc shape, which are used to disperse the mainstream direction of the exhaust gas and promote the uniform distribution of gas on the cross-section of the intake section.

[0024] The core function of the airflow distributor is to homogenize the exhaust gas field, ensuring that the gas is fully distributed before passing through the spray area and avoiding a decrease in mass transfer efficiency caused by gas deviation. The radial through-hole design allows the exhaust gas to pass through the distributor evenly, effectively reducing turbulence formation.

[0025] Turbulence structures further optimize airflow distribution by disturbing the exhaust gas field; their shape and arrangement determine the balance between turbulence intensity and energy consumption. Spiral or arc-shaped guide vanes can guide the gas to rotate upwards, increasing its flow path and enhancing its contact opportunities with the absorbent, laying a good foundation for subsequent absorption processes.

[0026] Furthermore, the above-mentioned spraying device includes a main pipe and several branch pipes connected thereto. The main pipe is connected to the absorbent circulation system. The branch pipes are symmetrically distributed on both sides of the main pipe. Several rotating atomizing nozzles are installed on the branch pipes. The spraying direction of the rotating atomizing nozzles points towards the lower end of the tower body.

[0027] The aforementioned spraying device and the aforementioned packing layer are arranged alternately. The aforementioned packing layer is a new type of structured packing, which has the characteristics of large specific surface area, high porosity, and fast mass transfer efficiency.

[0028] The atomization performance of the spray device is a key factor determining the absorption efficiency. The rotating atomizing nozzle disperses the absorbent liquid into fine droplets through centrifugal force generated by high-speed rotation. The droplets are uniform in size and have a wide coverage area, effectively increasing the gas-liquid interface and thus improving the chemical absorption efficiency.

[0029] The symmetrical arrangement of the branch pipes ensures a more even distribution of droplets and eliminates blind spots in the spray. The downward spray direction aligns with the upward flow of gas, creating counter-current contact and extending the reaction time.

[0030] The use of packing layers can significantly improve the gas-liquid mass transfer capacity per unit volume. Structured packing typically uses geometrically regular plastic or metal structures, such as stepped rings and Pall rings. Their dense arrangement and clear fluid channels reduce fluid channel turbulence and pressure drop, making them suitable for high-efficiency operation.

[0031] Furthermore, the aforementioned demister includes a baffle demister located at the lower part of the demister section and a wire mesh demister located on top of it. The demister configuration balances the efficient removal of both coarse and fine particles. The baffle demister primarily relies on changing the airflow direction to force droplets to collide with the baffle wall, forming droplet aggregation, which then settles to the lower collection tank by gravity. The wire mesh demister uses a metal or plastic fiber mesh structure with small fiber gaps, enabling it to efficiently capture fine droplets. It collects these tiny droplets through mechanisms such as inertial collision, diffusion, and coalescence. This dual demister structure ensures the dryness of the final exhaust gas emission, prevents absorbent liquid from being carried away, reduces the risk of corrosion to subsequent pipelines or emission systems, and meets environmental emission standards.

[0032] Furthermore, the aforementioned pre-spraying device includes:

[0033] A pre-spray receiving pipe connected at one end to the absorbent circulation system;

[0034] A distribution plate connected to the other end of the pre-spray receiving pipe;

[0035] Several pre-spray branch pipes are arranged in a circular array on the periphery of the distribution plate and connected to the pre-spray receiving pipe.

[0036] Several nozzles are installed on the pre-spray branch pipe, and the spraying direction of the nozzles points towards the upper end of the tower body.

[0037] The pre-spray device plays a role in the preliminary treatment of exhaust gas. Its main functions are to regulate the temperature and humidity of the gas, prevent the high-temperature exhaust gas from affecting the subsequent devices, and start the absorption reaction in advance to improve the overall absorption efficiency.

[0038] The circumferential arrangement of the distribution plate and branch pipes can achieve uniform coverage spraying, which not only ensures that the gas is fully wetted, but also allows for local spray intensity control by adjusting the spray angle and number of nozzles, adapting to different exhaust gas conditions.

[0039] This structure is particularly suitable for treating high-temperature, high-concentration, or easily crystallizing exhaust gases, helping to reduce the risk of blockage in subsequent packing layers while increasing absorbent utilization efficiency.

[0040] Furthermore, the aforementioned absorbent circulation system includes:

[0041] Absorbent delivery pipeline;

[0042] Several spray pipes corresponding to several spray devices, one end of each spray pipe is connected to an absorbent delivery pipeline, and the other end is connected to a spray device; an electrically controlled valve is installed on each spray pipe.

[0043] A pre-spraying pipe with one end connected to a pre-spraying device and the other end connected to an absorbent delivery pipeline; an electrically controlled valve is installed on the pre-spraying pipe.

[0044] A spray pump installed on the absorbent delivery pipeline;

[0045] An absorbent tank connected to an absorbent delivery pipeline via a spray pump;

[0046] One end of the absorbent return pipe is connected to the bottom of the lower part of the tower body, and the other end is connected to the bottom of the absorbent tank.

[0047] The absorbent circulation system constitutes the "blood circulation system" of the entire tower. The spray pump provides power to transport the absorbent liquid from the absorbent tank to the various spray devices and pre-spray devices, ensuring the continuous operation of the system.

[0048] The electrically controlled valves enable independent control of each branch, allowing adjustment of the flow rate at each spray point based on operating conditions, thus achieving segmented and refined management. The absorbent tank, serving as a liquid storage center, is connected to the bottom of the tower via a return pipeline to recover used absorbent liquid, further improving economic efficiency.

[0049] The automated control capabilities of the sprinkler system help reduce the frequency of manual intervention and improve the level of intelligence in system operation.

[0050] Furthermore, the absorbent tank is connected to the dosing tank via a pipe, and an electrically controlled valve is installed on the pipe. The lowest point of the liquid level in the dosing tank is higher than the highest point of the liquid level in the absorbent tank.

[0051] The absorbent tank is equipped with a sensor group, which includes a liquid level sensor and a reagent concentration sensor.

[0052] The absorbent tank is connected to a liquid addition pump via a pipe, which is used to replenish the absorbent tank with liquid.

[0053] This system establishes a complete automatic absorbent replenishment and concentration regulation loop. Because the dosing tank is positioned higher than the absorbent tank, it can replenish the absorbent by gravity flow, reducing pumping energy consumption and equipment complexity.

[0054] The sensor array enables real-time monitoring of the absorbent's status. A level sensor prevents the equipment from running dry, while a concentration sensor monitors the decline in the absorbent's reactivity. A replenishment pump replenishes the liquid lost due to evaporation or absorption reactions, ensuring the system always operates within the set parameter range.

[0055] Furthermore, the aforementioned fan, liquid pump, and several electrically controlled valves are respectively connected to the control system via communication.

[0056] The core of the control system lies in achieving automated operation and dynamic adjustment of the entire set of equipment. Through communication connections with the blower, liquid pump, and various electrically controlled valves, the system can respond and adjust according to real-time operating signals. For example, it can control the spray flow rate based on changes in exhaust gas concentration; and control the start and stop of the replenishment pump based on changes in liquid level.

[0057] The aforementioned control system includes:

[0058] The PLC controller is used to receive detection signals from various sensors and output control commands.

[0059] A touchscreen human-machine interface, installed on the outside of the tower, is used to display the system's operating status and parameter settings in real time;

[0060] The signal acquisition module, connected to the liquid level sensor and the reagent concentration sensor, is used to collect key operating parameters during the exhaust gas absorption process.

[0061] The actuator drive module is connected to the spray pump, liquid pump, fan and each electrically controlled valve, and is used to drive the actuator to work according to the control command.

[0062] The communication module is used to establish a data communication connection between the above control system and an external host computer or monitoring system;

[0063] The electrical wiring system is installed in a sealed control box, which is fixedly installed on the outside of the tower and has a waterproof and dustproof structure.

[0064] This communication connection typically uses PLC and industrial communication protocols (such as Modbus, Profibus, etc.), and can be expanded into a remote monitoring system to realize equipment networking, remote fault diagnosis, operation data collection and analysis, and improve the intelligence level and management efficiency of equipment.

[0065] The beneficial effects of this utility model are as follows:

[0066] With high absorption efficiency, the combination of multi-stage rotating atomizing spray device and new structured packing greatly improves the gas-liquid contact area and mass transfer efficiency, significantly enhancing the absorption effect.

[0067] The structure is modular, making installation and maintenance convenient. The tower body adopts a segmented unit design with flanges or clips for quick connection, which facilitates transportation, assembly, disassembly and maintenance, and adapts to various site conditions.

[0068] It is highly automated, operates intelligently and stably, and is equipped with a PLC control system and multiple sensors, enabling real-time monitoring and control of parameters such as liquid level, concentration, and pressure, as well as automatic alarm and linkage protection.

[0069] The pretreatment and demisting are designed in a coordinated manner. A pre-spraying device is provided for pre-cooling and humidifying the exhaust gas. The demisting section adopts a design of baffle plate and wire mesh demister superimposed, which can effectively remove the carried mist droplets and prevent secondary pollution.

[0070] The absorbent is recycled, which is energy-saving and environmentally friendly. The absorbent circulation system is reasonably designed and has automatic liquid replenishment and dosing functions, which improves the utilization rate of absorbent and reduces operating costs.

[0071] It is highly adaptable, with a structural design that is compatible with various exhaust gas components. It is suitable for various exhaust gas treatment scenarios, including acidic, alkaline, and organic exhaust gases, and its operating parameters can be flexibly adjusted according to the characteristics of the exhaust gas. Attached Figure Description

[0072] Figure 1 : A three-dimensional structural cross-sectional view of this utility model;

[0073] Figure 2 : A cross-sectional view of this utility model;

[0074] Figure 3 : A three-dimensional structural schematic diagram of this utility model;

[0075] Figure 4 : A three-dimensional structural diagram of the pre-spraying device of this utility model;

[0076] Figure 5 : A three-dimensional structural diagram of the airflow distributor of this utility model;

[0077] Figure 6 : A three-dimensional structural diagram of the spraying device of this utility model;

[0078] Figure 7 : A bottom view of the spraying device of this utility model;

[0079] Figure 8 : A three-dimensional structural diagram of the filler layer of this utility model;

[0080] Figure 9 : A bottom view of the filler layer of this utility model;

[0081] In the diagram: 1-Tower body, 2-Inlet section, 3-Airflow distributor, 4-Absorption section, 5-Spraying device, 6-Packing layer, 7-Demisting section, 8-Demister, 9-Outlet section, 10-Fan, 11-Absorbent circulation system, 12-Pre-spraying device, 111-Absorbent conveying pipeline, 112-Spraying pipeline, 113-Pre-spraying pipeline, 114-Spraying pump, 115-Absorbent tank, 116-Absorbent return pipeline, 117-Dosing tank, 118-Sensor group, 119-Liquid pump; 121-Pre-spraying receiving pipe, 122-Distribution plate, 123-Pre-spraying branch pipe, 124-Nozzle. Detailed Implementation

[0082] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0083] Example: Figure 1-9 As shown, a high-efficiency tower for exhaust gas absorption includes:

[0084] It is divided into an air intake section 2, an absorption section 4, a demisting section 7 and an air outlet section 9 from bottom to top, with an integrally formed tower body 1;

[0085] An airflow distributor 3, which is in the shape of a porous circular plate, is coaxially and fixedly connected inside the air intake section 2;

[0086] Several spray devices 5 and packing layers 6 are arranged in an alternating manner within the absorption section 4; the spray devices 5 are used to atomize and spray the absorbent, and the packing layers 6 are used to enhance the gas-liquid contact area.

[0087] The demister 8, installed in the demister section 7, is used to remove mist droplets from the exhaust gas;

[0088] An absorbent circulation system 11 is connected to several of the above-mentioned spray devices 5; the absorbent circulation system 11 is used to circulate and transport the absorbent liquid to the spray devices 5.

[0089] A pre-spray device 12 is installed in the air intake section 2 and located at the lower end of the airflow distributor 3;

[0090] The exhaust gas inlet pipe is connected to the intake section 2;

[0091] The exhaust pipe is connected to the exhaust section 9;

[0092] A fan 10 is installed and connected to the exhaust pipe.

[0093] The overall structural layout of the high-efficiency tower embodies the typical "countercurrent absorption" principle, where exhaust gas enters from the bottom of the tower and encounters the absorbent droplets sprayed from top to bottom, achieving full contact. The integrated tower body design effectively reduces the risk of leakage at interface joints, improving the overall sealing performance and structural strength of the equipment. The longitudinal segmentation design of the tower body follows the gas flow direction, and the function of each segment is optimized to improve overall absorption efficiency and operational stability.

[0094] The airflow distributor 3 ensures that the exhaust gas is evenly distributed when it first enters the absorption tower, effectively avoiding the formation of local high-speed channels, preventing the "short-circuit effect," and ensuring uniform gas-liquid contact. The staggered arrangement of the spray device 5 and the packing layer 6 helps to form a multi-stage mass transfer interface in the tower, improving absorption efficiency while also extending the residence time of the exhaust gas in the tower.

[0095] The absorbent circulation system 11 ensures the recycling of the absorbent and effectively controls operating costs. The pre-spray device 12 is installed at the initial stage of gas flow to cool, humidify, and accelerate the reaction, thereby improving the absorption effect of the gas in subsequent stages. The configuration of the fan 10 provides the driving force for the exhaust gas flow and is a key component for realizing the overall gas flow in the tower.

[0096] Furthermore, the tower body 1 comprises multiple independently formed segment units, each segment unit corresponding to the air inlet section 2, the absorption section 4, the demisting section 7, and the air outlet section 9. The segment units can be detachably connected by flange connection or snap-on quick connection device to facilitate transportation, installation, and maintenance. The tower body 1 is made of corrosion-resistant material, including fiberglass or stainless steel.

[0097] The modular design of the segmented unit aligns with the trends of lightweighting and standardization in modern industrial equipment. This structure significantly enhances the flexibility of the equipment during manufacturing, transportation, and on-site assembly, facilitating future upgrades, expansions, or replacements. The use of flange or snap-fit ​​connections allows for tool-less quick installation and sealing, making it particularly suitable for applications requiring frequent maintenance.

[0098] Tower body 1 uses fiberglass or stainless steel as the main material, which has good corrosion resistance and can withstand long-term corrosion from most acid and alkali absorbents, extending its service life and reducing maintenance costs. At the same time, fiberglass has the advantages of being lightweight and easy to install, while stainless steel is more suitable for high-temperature and high-pressure scenarios. The two can be selected according to the actual application scenario.

[0099] Furthermore, the aforementioned airflow distributor 3 is a porous circular plate with radially distributed through holes, and a turbulence structure is provided on its surface or below. The turbulence structure includes several guide vanes or raised ribs arranged in a spiral or arc shape, which are used to disperse the mainstream direction of the exhaust gas and promote the uniform distribution of gas on the cross section of the intake section 2.

[0100] The core function of the airflow distributor 3 is to homogenize the exhaust gas field, ensuring that the gas is fully distributed before passing through the spray area, thus avoiding a decrease in mass transfer efficiency caused by gas deviation. The radial through-hole design allows the exhaust gas to pass through the distributor evenly, effectively reducing turbulence formation.

[0101] Turbulence structures further optimize airflow distribution by disturbing the exhaust gas field; their shape and arrangement determine the balance between turbulence intensity and energy consumption. Spiral or arc-shaped guide vanes can guide the gas to rotate upwards, increasing its flow path and enhancing its contact opportunities with the absorbent, laying a good foundation for subsequent absorption processes.

[0102] Furthermore, the above-mentioned spraying device 5 includes a main pipe and several branch pipes connected thereto. The main pipe is connected to the absorbent circulation system 11. The branch pipes are symmetrically distributed on both sides of the main pipe. Several rotating atomizing nozzles are provided on the branch pipes. The spraying direction of the rotating atomizing nozzles points to the lower end of the tower body 1.

[0103] The spraying device 5 and the packing layer 6 are arranged alternately. The packing layer 6 is a new type of structured packing, which has the characteristics of large specific surface area, high porosity and fast mass transfer efficiency.

[0104] The atomization performance of the spray device 5 is a key factor determining the absorption efficiency. The rotating atomizing nozzle disperses the absorbent liquid into fine droplets through centrifugal force generated by high-speed rotation. The droplets are uniform in size and have a wide coverage area, effectively increasing the gas-liquid interface and thus improving the chemical absorption efficiency.

[0105] The symmetrical arrangement of the branch pipes ensures a more even distribution of droplets and eliminates blind spots in the spray. The downward spray direction aligns with the upward flow of gas, creating counter-current contact and extending the reaction time.

[0106] The use of packing layer 6 can significantly improve the gas-liquid mass transfer capacity per unit volume. Structured packing typically uses geometrically regular plastic or metal structures, such as stepped rings and Pall rings. Their dense arrangement and clear fluid channels reduce fluid channel turbulence and pressure drop, making them suitable for high-efficiency operation.

[0107] Furthermore, the aforementioned demister 8 includes a baffle demister disposed at the lower part of the demister section 7 and a wire mesh demister disposed thereon.

[0108] The configuration of demister 8 balances the efficient removal capabilities of both coarse and fine particles. The baffle demister mainly relies on changing the airflow direction to force droplets to collide with the baffle wall, forming droplet aggregation, and then using gravity to settle into the lower collection tank.

[0109] Wire mesh demisters use a metal or plastic fiber mesh structure with small gaps between the fibers, which can efficiently capture fine mist droplets and collect them through mechanisms such as inertial collision, diffusion and coalescence.

[0110] The dual demisting structure ensures the dryness of the final exhaust gas, prevents the absorption liquid from being carried out, reduces the risk of corrosion to subsequent pipelines or emission systems, and meets environmental emission standards.

[0111] Furthermore, the aforementioned pre-spraying device 12 includes:

[0112] A pre-spray receiving pipe 121, one end of which is connected to the absorbent circulation system 11;

[0113] A distribution plate 122 is connected to the other end of the pre-spray receiving pipe 121;

[0114] Several pre-spray branch pipes 123 are arranged in a circular array on the circumference of the distribution plate 122 and are connected to the pre-spray receiving pipe 121.

[0115] A number of nozzles 124 are installed on the pre-spray branch pipe 123, and the spraying direction of the nozzles 124 is directed towards the upper end of the tower body 1.

[0116] The pre-spray device 12 plays a role in the preliminary treatment of exhaust gas. Its main functions are to regulate the temperature and humidity of the gas, prevent the high-temperature exhaust gas from affecting the subsequent devices, and start the absorption reaction in advance to improve the overall absorption efficiency.

[0117] The circumferential arrangement structure formed by the distribution plate 122 and the branch pipe 123 can achieve uniform coverage spraying, which not only ensures that the gas is fully wetted, but also allows for local spray intensity control by adjusting the spray angle and number of nozzles 124, adapting to different exhaust gas conditions.

[0118] This structure is particularly suitable for treating high-temperature, high-concentration, or easily crystallizing exhaust gases, helping to reduce the risk of blockage in subsequent packing layers while increasing absorbent utilization efficiency.

[0119] Furthermore, the aforementioned absorbent circulation system 11 includes:

[0120] Absorbent delivery pipeline 111;

[0121] A plurality of spray pipes 112 are provided, each corresponding to a plurality of spray devices 5. One end of each spray pipe 112 is connected to an absorbent delivery pipe 111, and the other end is connected to a spray device 5. An electrically controlled valve is provided on each spray pipe 112.

[0122] A pre-spraying pipe 113 is connected at one end to the pre-spraying device 12 and at the other end to the absorbent delivery pipeline 111; an electrically controlled valve is installed on the pre-spraying pipe 113.

[0123] A spray pump 114 is installed on the absorbent delivery pipeline 111;

[0124] The absorbent tank 115 is connected to the absorbent delivery pipeline 111 via the spray pump 114;

[0125] An absorbent return pipe 116 is connected at one end to the bottom of the lower end of the tower body 1 and at the other end to the bottom of the absorbent tank 115.

[0126] The absorbent circulation system 11 constitutes the "blood circulation system" for the entire tower operation. The spray pump 114 provides power to transport the absorbent liquid from the absorbent tank 115 to the various spray devices 5 and the pre-spray device 12, ensuring the continuous operation of the system.

[0127] The electrically controlled valves enable independent control of each branch, allowing adjustment of the flow rate at each spray point according to operating conditions, thus achieving segmented and refined management. The absorbent tank 115 serves as a liquid storage center and is connected to the bottom of the tower via the return pipe 116 to recover the used absorbent liquid, further improving economic efficiency.

[0128] The automated control capabilities of the sprinkler system help reduce the frequency of manual intervention and improve the level of intelligence in system operation.

[0129] Furthermore, the absorbent tank 115 is connected to the dosing tank 117 via a pipe, and an electrically controlled valve is installed on the pipe. The lowest point of the liquid level in the dosing tank 117 is higher than the highest point of the liquid level in the absorbent tank 115.

[0130] The absorbent tank 115 is equipped with a sensor group 118, which includes a liquid level sensor and a reagent concentration sensor.

[0131] The absorbent tank 115 is connected to the liquid pump 119 via a pipe. The liquid pump 119 is used to replenish the absorbent tank 115 with liquid.

[0132] The system is designed to form a complete automatic absorbent replenishment and concentration adjustment loop. Because the dosing tank 117 is located higher than the absorbent tank 115, it can replenish the absorbent to the tank by gravity flow, reducing pumping energy consumption and equipment complexity.

[0133] Sensor group 118 enables real-time monitoring of the absorbent's status, with a level sensor preventing dry operation and a concentration sensor monitoring the decline in the absorbent's reactivity. Addition pump 119 replenishes the liquid lost due to evaporation or absorption chemical reactions, ensuring the system always operates within the set parameter range.

[0134] Furthermore, the aforementioned fan 10, liquid pump 119, and several electrically controlled valves are respectively connected to the control system via communication.

[0135] The core of the control system lies in achieving automated operation and dynamic adjustment of the entire set of equipment. Through communication connections with the blower 10, the liquid supply pump 119, and various electrically controlled valves, the system can respond and adjust according to real-time operating signals. For example, it can control the spray flow rate based on changes in exhaust gas concentration; and control the start and stop of the replenishment pump based on changes in liquid level.

[0136] The aforementioned control system includes:

[0137] The PLC controller is used to receive detection signals from various sensors and output control commands.

[0138] A touch screen human-machine interface is installed on the outside of tower body 1 to display the system operating status and parameter settings in real time;

[0139] The signal acquisition module, connected to the liquid level sensor and the reagent concentration sensor, is used to collect key operating parameters during the exhaust gas absorption process.

[0140] The execution unit drive module is connected to the spray pump 114, the liquid adding pump 119, the fan 10 and each electrically controlled valve, and is used to drive the execution element to work according to the control command.

[0141] The communication module is used to establish a data communication connection between the above control system and an external host computer or monitoring system;

[0142] The electrical wiring system is installed in a sealed control box, which is fixedly installed on the outside of the tower body 1 and has a waterproof and dustproof structure.

[0143] This communication connection typically uses PLC and industrial communication protocols (such as Modbus, Profibus, etc.), and can be expanded into a remote monitoring system to realize equipment networking, remote fault diagnosis, operation data collection and analysis, and improve the intelligence level and management efficiency of equipment.

[0144] In summary, a high-efficiency tower for exhaust gas absorption features a vertically arranged structure. The tower body (1) is made of fiberglass, exhibiting strong corrosion resistance and suitability for treating various complex industrial exhaust gases, including those containing acids, alkalis, and organic matter. The tower body comprises four sections: an inlet section (2), an absorption section (4), a demister section (7), and an outlet section (9). These sections are connected via a snap-fit ​​quick-connect device, facilitating transportation, on-site installation, and subsequent maintenance.

[0145] A tail gas inlet pipe is installed at the bottom of the inlet section 2, and the tail gas is introduced into the tower body from the production equipment by the fan 10. The airflow first passes through the airflow distributor 3 installed inside the inlet section 2. The airflow distributor 3 is in the form of a porous circular plate with spiral guide vanes on the plate surface, which can disperse and evenly distribute the tail gas across the cross-section of the tower body, prevent local short-circuit flow, and improve the uniformity of gas-liquid contact and absorption efficiency. Below the airflow distributor 3, a pre-spray device 12 is also installed, which is supplied with liquid through the absorbent circulation system 11, and pre-cools and humidifies the tail gas before it enters the absorption section 4, which helps to improve the subsequent gas-liquid mass transfer effect.

[0146] The exhaust gas then enters absorption section 4. This section is the core working area of ​​this high-efficiency tower, equipped with three sets of staggered spray devices 5 and a packing layer 6. The main pipe of the spray device 5 is connected to the absorbent circulation system 11, and several symmetrically arranged branch pipes are installed on the main pipe, with multiple rotating atomizing nozzles on the branch pipes. The rotating atomizing nozzles can spin under the pressure of the absorbent, resulting in strong atomization and forming fine droplets, effectively increasing the specific surface area of ​​the absorbent. The packing layer 6 is located between the spray devices 5, and the packing uses a new type of structured packing with high porosity and mass transfer efficiency, improving the gas-liquid contact depth and efficiency.

[0147] An absorbent return pipe 116 is installed at the bottom of the tower, connecting to the absorbent tank 115 located at the bottom, to achieve liquid recycling. The absorbent is pumped from the absorbent tank 115 by the spray pump 114 through the absorbent delivery pipe 111 to the top of the tower, distributed through the spray pipes 112, and then enters the corresponding spray device 5, forming a complete cycle. The absorbent tank 115 is equipped with a sensor group 118 consisting of a liquid level sensor and a concentration sensor to detect the absorbent status; it is also connected to the liquid addition pump 119 and the dosing tank 117, automatically replenishing liquid and reagents when the system detects a decrease in concentration or insufficient liquid level.

[0148] After being treated by the absorption section 4, the exhaust gas still carries a certain amount of mist droplets and enters the demisting section 7 for demisting. This section includes a baffle demister at the bottom and a wire mesh demister at the top. The exhaust gas first passes through the baffle demister, causing the mist droplets to coalesce into larger droplets through inertial collision and fall into the collection tank below due to gravity; then it enters the wire mesh demister to further remove fine mist droplets, ensuring that the exhaust gas is discharged cleanly and without dripping liquid.

[0149] The purified exhaust gas, after final treatment, is discharged from the exhaust section 9 through the exhaust pipe. The exhaust section 9 is equipped with a gas flow equalization device to ensure more uniform and stable exhaust gas distribution. A fan 10 is installed on the exhaust pipe to provide power for transporting the exhaust gas. The fan 10 is connected to an external PLC via a control system, which allows for real-time adjustment of the fan's operating status based on parameters such as exhaust gas flow rate, temperature, and pressure during the absorption tower's operation, ensuring stable system operation.

[0150] The entire system is centrally managed, with the control system using PLCs and HMIs to collect, calculate, and provide feedback on parameters in real time. This allows for dynamic adjustment of various operating parameters, such as fan speed, spray flow rate, and liquid addition frequency. All key actuators, including electrically controlled valves, spray pumps, liquid addition pumps, and fans, are connected to the control system, enabling highly automated, unattended operation. In the event of a system malfunction or abnormality, such as abnormal absorbent concentration, insufficient liquid level, or nozzle blockage, the control system will automatically trigger an alarm and implement safety protection measures, such as stopping the spray, shutting down the fan, and cutting off power, to ensure the safety of equipment and personnel.

[0151] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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-efficiency tower for exhaust gas absorption, characterized in that, include: The tower body (1) is divided into an air intake section (2), an absorption section (4), a demisting section (7) and an air outlet section (9) from bottom to top. An airflow distributor (3) is a porous circular plate and is coaxially fixedly connected to the air intake section (2). Several spray devices (5) and packing layers (6) are arranged in an alternating manner within the absorption section (4); the spray devices (5) are used to atomize and spray the absorbent, and the packing layers (6) are used to enhance the gas-liquid contact area. A demister (8) installed in the demister section (7) is used to remove mist droplets from the exhaust gas; An absorbent circulation system (11) is connected to several of the spray devices (5); the absorbent circulation system (11) is used to circulate and transport the absorbent liquid to the spray devices (5). A pre-spray device (12) is installed in the air intake section (2) and located at the lower end of the airflow distributor (3). The exhaust gas inlet pipe is connected to the intake section (2); The exhaust pipe is connected to the exhaust section (9); A fan (10) is installed and connected to the exhaust pipe.

2. The high-efficiency tower for exhaust gas absorption according to claim 1, characterized in that, The tower body (1) includes multiple independently formed segment units, each segment unit corresponding to an air inlet section (2), an absorption section (4), a demisting section (7), and an air outlet section (9). The segment units can be detachably connected by flange connection or snap-on quick connection device to facilitate transportation, installation and maintenance. The tower body (1) is made of corrosion-resistant material, including fiberglass or stainless steel.

3. The high-efficiency tower for exhaust gas absorption according to claim 1, characterized in that, The airflow distributor (3) is a porous circular plate with radially distributed through holes. A turbulence structure is provided on its surface or below. The turbulence structure includes several guide vanes or raised ribs arranged in a spiral or arc shape, which are used to disperse the main direction of the exhaust gas and promote the uniform distribution of gas on the cross section of the intake section (2).

4. The high-efficiency tower for exhaust gas absorption according to claim 1, characterized in that, The spraying device (5) includes a main pipe and several branch pipes connected thereto. The main pipe is connected to the absorbent circulation system (11). The branch pipes are symmetrically distributed on both sides of the main pipe. Several rotating atomizing nozzles are installed on the branch pipes. The spraying direction of the rotating atomizing nozzles points to the lower end of the tower body (1). The spraying device (5) and the packing layer (6) are alternately arranged, and the packing layer (6) is a structured packing.

5. A high-efficiency tower for exhaust gas absorption according to claim 1, characterized in that, The demister (8) includes a baffle demister located at the lower part of the demister section (7) and a wire mesh demister located thereon.

6. The high-efficiency tower for exhaust gas absorption according to claim 1, characterized in that, The pre-spraying device (12) includes: A pre-spray receiving pipe (121) is connected at one end to the absorbent circulation system (11). A distribution plate (122) is connected to the other end of the pre-spray receiving pipe (121). Several pre-spray branch pipes (123) are arranged in a circular array on the circumference of the distribution plate (122) and connected to the pre-spray receiving pipe (121). A number of nozzles (124) are installed on the pre-spray branch pipe (123), and the spraying direction of the nozzles (124) is directed towards the upper end of the tower body (1).

7. A high-efficiency tower for exhaust gas absorption according to any one of claims 1-6, characterized in that, The absorbent circulation system (11) includes: Absorbent delivery pipeline (111); A number of spray pipes (112) corresponding one-to-one with a number of spray devices (5), one end of the spray pipe (112) is connected to the absorbent delivery pipeline (111), and the other end is connected to the spray device (5); an electric control valve is provided on the spray pipe (112); A pre-spraying pipe (113) is connected at one end to a pre-spraying device (12) and at the other end to an absorbent delivery pipeline (111); an electrically controlled valve is installed on the pre-spraying pipe (113); A spray pump (114) is installed on the absorbent delivery pipeline (111). The absorbent tank (115) is connected to the absorbent delivery pipeline (111) via a spray pump (114). An absorbent return pipe (116) is connected at one end to the bottom of the tower body (1) and at the other end to the bottom of the absorbent tank (115).

8. A high-efficiency tower for exhaust gas absorption according to claim 7, characterized in that, The absorbent tank (115) is connected to the dosing tank (117) via a pipe. An electrically controlled valve is installed on the pipe. The lowest point of the liquid level in the dosing tank (117) is higher than the highest point of the liquid level in the absorbent tank (115). The absorbent tank (115) is equipped with a sensor group (118), which includes a liquid level sensor and a drug concentration sensor. The absorbent tank (115) is connected to the liquid pump (119) via a pipe. The liquid pump (119) is used to replenish the absorbent tank (115) with liquid.

9. A high-efficiency tower for exhaust gas absorption according to claim 7, characterized in that, The blower (10), the liquid pump (119) and several electrically controlled valves are respectively connected to the control system in communication.

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