A novel scrubbing column system

Abstract

The utility model provides a novel washing tower system, simple process, small footprint, save investment, can realize the quick dust removal and the cooling of acid gas. The tower body inside is sequentially provided with liquid holding tray, padding, spray layer and demister from below to above, and the dust removal circulating liquid is filled in the bottom of the tower body, the lower part of the tower body is provided with the import of being located below the liquid holding tray, the import is connected with the reverse spray pipe, the high temperature acid gas containing dust passes through the reverse spray pipe and is led into the tower body, the top of the tower body is provided with the head, the top of the head is provided with the export, is used for discharging the low temperature purified acid gas, the bottom of the tower body is connected to the dust removal circulating pump import through the pipeline, the dust removal circulating pump export is connected the filter import through the pipeline, the filter export is connected to the reverse spray pipe, constitutes the dust removal circulating loop, the liquid holding tray is connected to the cooling circulating pump import through the pipeline, the cooling circulating pump export is connected to the cooler import through the pipeline, the cooler export is connected to the spray layer through the pipeline, constitutes the cooling circulating loop.

Description

Technical Field

[0001] This utility model belongs to the field of environmental protection engineering and relates to activated carbon regeneration technology for desulfurization and denitrification, specifically a new type of scrubbing tower system. Background Technology

[0002] In the integrated activated carbon desulfurization and denitrification process, the activated carbon needs to be regenerated after adsorbing pollutants. The regeneration process generates a large amount of high-temperature acidic gas containing dust. To achieve the resource utilization of pollutants, such as for the production of concentrated sulfuric acid, sodium metabisulfite, and other chemicals, the acidic gas must first be effectively purified and pretreated. The core steps include dust removal and cooling.

[0003] Currently, traditional processes generally use multiple scrubbing towers connected in series or parallel to complete the above pretreatment tasks. For example, one scrubbing tower is first used for gas dust removal, and then the gas after preliminary dust removal is passed into another or more scrubbing towers for cooling. However, this multi-equipment series process mode has the following drawbacks: (1) Complex process flow: Multiple towers, matching pumps, valves, pipelines and instrument control systems make the entire system structure complex and increase the number of operation and maintenance points. (2) Large footprint: Each independent scrubbing tower requires an independent installation foundation and space, increasing the difficulty of equipment layout. (3) High investment cost: The cost of purchasing, installing, civil engineering and connecting pipelines for multiple towers and their auxiliary equipment results in a large initial investment for the entire system. Utility Model Content

[0004] To address the shortcomings of existing technologies that use multiple scrubbing towers to treat acidic gases, such as complex processes, large footprints, and high investment costs, this invention provides a novel scrubbing tower system with a simpler process, smaller footprint, and lower investment costs, enabling rapid dust removal and cooling of acidic gases.

[0005] The technical solution adopted by this utility model to solve its technical problem is: A novel scrubbing tower system includes a scrubbing tower. Inside the tower body, from bottom to top, are arranged a liquid holding tray, packing material, a spray layer, and a demister. The bottom of the tower body is filled with dust-removing circulating liquid. An inlet located below the liquid holding tray is opened on the lower side wall of the tower body, and a reverse spray pipe is connected to the inlet. High-temperature, dust-laden acidic gas is introduced into the tower body through the reverse spray pipe. A head is provided at the top of the tower body, and an outlet is opened at the top of the head for discharging low-temperature purified acidic gas. The bottom of the tower is connected to the inlet of the dust removal circulation pump via a pipe, the outlet of the dust removal circulation pump is connected to the inlet of the filter via a pipe, and the outlet of the filter is connected to the reverse spray pipe, thus forming a dust removal circulation loop. The liquid holding tray is connected to the inlet of the cooling circulation pump via a pipe, the outlet of the cooling circulation pump is connected to the inlet of the cooler via a pipe, and the outlet of the cooler is connected to the spray layer via a pipe, thus forming a cooling circulation loop.

[0006] Furthermore, it also includes a liquid holding pan level regulating mechanism and a tower bottom level regulating mechanism; the liquid holding pan level regulating mechanism is used to control the liquid level of the liquid holding pan, and the tower bottom level regulating mechanism is used to control the liquid level of the dust removal circulating liquid at the bottom of the tower body.

[0007] Furthermore, the liquid holding pan level adjustment mechanism includes a liquid holding pan level gauge and a liquid holding pan level adjustment valve. The liquid holding pan level gauge is connected to the liquid holding pan for monitoring the liquid holding pan level. The liquid holding pan level adjustment valve is installed on the connecting pipe between the liquid holding pan and the bottom of the tower body, and the liquid holding pan level gauge and the liquid holding pan level adjustment valve are electrically connected.

[0008] Furthermore, the bottom liquid level regulating mechanism includes a bottom liquid level gauge and a bottom liquid level regulating valve. The bottom liquid level gauge is installed at the bottom of the tower body to monitor the liquid level of the dust removal circulating liquid. The bottom liquid level regulating valve is installed on the discharge pipe connected to the filter outlet, and the bottom liquid level gauge and the bottom liquid level regulating valve are electrically connected.

[0009] Furthermore, the liquid holding tray has multiple evenly distributed gas rising channels at the same height, and the gas rising channels are equipped with baffles to prevent droplets from falling from the gas rising channels.

[0010] Furthermore, the spray layer is provided with evenly distributed nozzles for atomizing and uniformly distributing the cooling circulating liquid from the cooler onto the packing.

[0011] Furthermore, the demister has a wire mesh structure and is used to capture mist droplets in the gas phase.

[0012] The beneficial effects of this utility model include: This system highly integrates functions such as dust removal via the reverse nozzle, cooling and further dust removal in the packing layer, and droplet separation via a demister into a single tower. It is supplemented by independently operating dual-circulation loops for dust removal and cooling, and liquid level control. Compared to traditional multi-tower series processes, this fundamentally simplifies the process flow and equipment structure, significantly reducing equipment footprint, supporting facilities, and civil engineering costs, thereby lowering initial investment and subsequent maintenance expenses. The system achieves efficient dust removal of particulate matter in acidic gas through counter-current gas-liquid contact within the reverse nozzle. Subsequently, in the packing layer, cooled circulating liquid engages with the acidic gas in sufficient gas-liquid contact and heat transfer, achieving not only rapid and deep cooling of the gas but also effective further fine dust removal of penetrating fine particles through the liquid film on the packing surface, resulting in high and stable purification efficiency. Furthermore, the system's liquid holding tray collects the cooling circulating liquid and condensate flowing down from the packing layer, providing a stable liquid source for the cooling circulating pump. Its liquid level regulating valve discharges excess liquid to the bottom of the tower, automatically maintaining the system's water balance. The system's dust collection circulating pump pumps the dust collection circulating liquid, which has collected dust particles at the bottom of the tower, to the filter. The filter traps and separates solid particles from the liquid. The filtered dust collection circulating liquid is then sent to the reverse nozzle for dust removal, thus achieving dust collection circulation. This setup ensures the long-term, continuous, and stable operation of the entire system, ultimately achieving efficient and reliable pretreatment of acidic gas with a more compact configuration and lower cost, laying a solid foundation for its subsequent resource utilization. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of a novel washing tower system according to this utility model.

[0014] In the diagram: 1. Scrubber; 2. Cooler; 3. Cooling circulation pump; 4. Liquid level gauge on holding pan; 5. Liquid level regulating valve on holding pan; 6. Liquid level regulating valve at the bottom of the tower; 7. Filter; 8. Dust removal circulation pump; 9. Liquid level gauge at the bottom of the tower; 11. Backspray nozzle; 12. End cap; 13. Demister; 14. Spray layer; 15. Packing; 16. Holding pan; 17. Tower body. Detailed Implementation

[0015] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0016] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0017] A novel scrubbing tower system, simpler in process flow, smaller in footprint, and more cost-effective than traditional methods, enables rapid dust removal and cooling of acidic gases. For example... Figure 1 As shown, the system includes a scrubbing tower 1, a cooler 2, a cooling circulation pump 3, a liquid level gauge 4, a liquid level regulating valve 5, a bottom liquid level regulating valve 6, a filter 7, a dust removal circulation pump 8, and a bottom liquid level gauge 9. The scrubbing tower 1 is composed of a reverse spray pipe 11, a head 12, a demister 13, a spray layer 14, packing 15, a liquid holding pan 16, and a tower body 17.

[0018] The tower body 17 of the scrubbing tower 1 serves as the core container of the entire system. Its interior is designed with upper and lower partitions. The lower part of the tower body 17 is the dust removal area, and the upper part is the cooling and further dust removal area. The two areas are physically separated and functionally connected by the liquid holding tray 16.

[0019] In the dust removal area, an air inlet is opened on the lower side wall of the tower body 17 and connected to the reverse nozzle 11. High-temperature, dust-laden acidic gas enters through this inlet. Dust removal circulating liquid is stored at the bottom of the tower body 17 for capturing particulate matter. The inlet of the dust removal circulating pump 8 is connected to the bottom of the tower via a pipe, and its outlet is connected in sequence to the filter 7 and the reverse nozzle 11, forming a dust removal circulating loop. The function of this loop is as follows: the dust removal circulating pump 8 draws the dust removal circulating liquid containing a large amount of particulate matter from the bottom of the tower, pressurizes it, and sends it to the filter 7; the filter 7 traps and separates solid particles from the liquid, purifying the dust removal circulating liquid; the purified dust removal circulating liquid is then sent back to the reverse nozzle 11, where it is atomized through nozzles inside the reverse nozzle 11 and undergoes efficient countercurrent contact dust removal with the incoming high-temperature, dust-laden acidic gas.

[0020] In the cooling and further dust removal area, packing material 15, spray layer 14, and demister 13 are sequentially arranged above the liquid holding tray 16. The top of the tower body 17 is sealed by a head 12, on which a low-temperature purified acid gas outlet is provided. The head 12 can be flat, elliptical, circular, or other shapes. The liquid holding tray 16 is used to collect liquid dripping from the packing material 15. Multiple evenly distributed and equal-height gas rising channels are provided on it to allow the gas after dust removal to rise uniformly. Baffles are provided on the gas rising channels to prevent liquid from leaking directly from the gas rising channels. The liquid holding tray 16 is connected to the inlet of the cooling circulation pump 3 through a pipe. The outlet of the cooling circulation pump 3 is sequentially connected to the cooler 2 and the spray layer 14, forming a cooling circulation loop. The function of this circuit is as follows: the cooling circulation pump 3 extracts the liquid collected in the liquid holding pan 16 and sends it to the cooler 2 to exchange heat with an external cold source (such as circulating cooling water) to cool it down; the cooled liquid is sent to the spray layer 14 and atomized through the uniformly distributed nozzles on it, and sprayed evenly on the packing 15.

[0021] The packing 15 can be made of various bulk or structured packing materials, and its large specific surface area provides ample contact area for the gas and liquid phases. Low-temperature droplets flowing downwards and acidic gas flowing upwards come into countercurrent contact on the packing surface, achieving efficient heat and mass transfer, resulting in rapid cooling of the gas and deep capture of residual fine particles. The demister 13, with a wire mesh structure, is located above the packing 15 and is used to capture entrained droplets in the gas, ensuring the cleanliness of the outlet gas.

[0022] Preferably, to ensure stable operation of the two circulation loops, the system is equipped with a liquid level control mechanism. The liquid level adjustment mechanism for the holding pan consists of a liquid level gauge 4 and a liquid level regulating valve 5. The liquid level gauge 4 is connected to the holding pan 16, and the liquid level regulating valve 5 is located on the connecting pipe between the holding pan 16 and the bottom of the tower body 17. The liquid level gauge 4 monitors the liquid level in the holding pan 16 in real time and controls the opening of the liquid level regulating valve 5 via a signal to discharge excess liquid to the bottom of the tower, thereby maintaining a stable liquid level in the holding pan 16. The bottom liquid level adjustment mechanism consists of a bottom liquid level gauge 9 and a bottom liquid level regulating valve 6. The bottom liquid level gauge 9 is located at the bottom of the tower body 17, and the bottom liquid level regulating valve 6 is located on the discharge pipe connected to the outlet of the filter 7. The bottom liquid level gauge 9 monitors the bottom liquid level in real time and controls the opening of the bottom liquid level regulating valve 6 via a signal to discharge excess waste liquid from the system, thereby maintaining a stable bottom liquid level.

[0023] The system's workflow is as follows: High-temperature, dust-laden acidic gas first enters the reverse nozzle 11. Simultaneously, the dust-removing circulating liquid, purified by the filter 7, is pumped by the dust-removing circulating pump 8 to the nozzle of the reverse nozzle 11 and atomized into fine droplets. The high-temperature, dust-laden acidic gas and droplets undergo intense countercurrent mixing and collision, with most of the dust particles in the gas being captured by the droplets, achieving efficient pre-dust removal. After pre-dust removal, the gas-liquid mixture enters the lower space of the tower body 17, where the flow velocity decreases. The droplets carrying particulate matter settle due to gravity and fall to the bottom of the tower, while the acidic gas flows upward and is evenly guided into the upper packing 15 area through the gas rising channel on the liquid holding tray 16. The rising gas enters the packing 15, and simultaneously, the cooling circulating liquid from the spray layer 14, cooled by the cooler 2, is evenly sprayed onto the surface of the packing 15. The gas and the cooling circulating liquid undergo thorough and efficient countercurrent contact on the surface of the packing 15. During this process, the gas is rapidly and deeply cooled. Simultaneously, residual fine particles in the gas are further captured by the liquid film on the surface of the packing 15, achieving dust removal and cooling. The condensate generated during cooling, as well as the cooling circulating liquid dripping from the packing 15, falls into the liquid holding tray 16 for collection. The wet, saturated acidic gas, after dust removal and cooling, continues to rise, passing through the demister 13. The demister 13 effectively captures and separates the liquid droplets and mist entrained in the gas, ensuring the dryness and cleanliness of the discharged gas. Finally, the low-temperature purified acidic gas is discharged from the outlet of the tower top head 12 and enters the subsequent process.

[0024] The solid-containing dust removal circulating liquid collected at the bottom of the tower is pumped to the filter 7 by the dust removal circulating pump 8, where solid particles are separated and discharged from the system, and the filtrate is returned to the reverse spray pipe 11 for recycling. The bottom liquid level is monitored by the bottom liquid level gauge 9 and controlled by the bottom liquid level regulating valve 6 to maintain a stable liquid level.

[0025] The liquid collected in the liquid holding pan 16 is pumped to the cooler 2 by the cooling circulation pump 3 and then sent to the spray layer 14 for recycling. The liquid level in the liquid holding pan 16 is monitored by the liquid holding pan level gauge 4 and excess liquid is discharged to the bottom of the tower by the liquid holding pan level regulating valve 5 to maintain a stable liquid level in the liquid holding pan 16.

[0026] In summary, this system achieves dust removal and cooling of acidic gas using a single scrubbing tower. Compared to traditional processes involving multiple scrubbing towers, this method offers a simpler process, requires less floor space, and saves on investment. The condensate generated during the cooling process of the acidic gas in the packing mixes with the cooling circulating liquid and enters the liquid holding pan. Finally, it flows through the liquid holding pan's level regulating valve to the bottom of the tower, ensuring simple and reliable level control.

[0027] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A novel scrubbing tower system, characterized in that, The system includes a scrubbing tower (1), in which a liquid holding plate (16), packing (15), spray layer (14) and demister (13) are arranged from bottom to top inside the tower body (17), and the bottom of the tower body (17) is filled with dust removal circulating liquid; an inlet located below the liquid holding plate (16) is opened on the lower side wall of the tower body (17), and a reverse spray pipe (11) is connected to the inlet, through which high-temperature dust-containing acidic gas is introduced into the tower body (17); a head (12) is provided on the top of the tower body (17), and an outlet is opened on the top of the head (12) for discharging low-temperature purified acidic gas; The bottom of the tower body (17) is connected to the inlet of the dust removal circulation pump (8) through a pipe, the outlet of the dust removal circulation pump (8) is connected to the inlet of the filter (7) through a pipe, and the outlet of the filter (7) is connected to the reverse spray pipe (11), forming a dust removal circulation loop; The liquid holding plate (16) is connected to the inlet of the cooling circulation pump (3) through a pipe, the outlet of the cooling circulation pump (3) is connected to the inlet of the cooler (2) through a pipe, and the outlet of the cooler (2) is connected to the spray layer (14) through a pipe, thus forming a cooling circulation loop.

2. The novel scrubbing tower system according to claim 1, characterized in that, It also includes a liquid holding pan level regulating mechanism and a tower bottom level regulating mechanism; the liquid holding pan level regulating mechanism is used to control the liquid level of the liquid holding pan (16), and the tower bottom level regulating mechanism is used to control the liquid level of the dust removal circulating liquid at the bottom of the tower body (17).

3. The novel scrubbing tower system according to claim 2, characterized in that, The liquid holding pan level adjustment mechanism includes a liquid holding pan level gauge (4) and a liquid holding pan level adjustment valve (5). The liquid holding pan level gauge (4) is connected to the liquid holding pan (16) for monitoring the liquid holding pan level. The liquid holding pan level adjustment valve (5) is installed on the connecting pipe between the liquid holding pan (16) and the bottom of the tower body (17), and the liquid holding pan level gauge (4) and the liquid holding pan level adjustment valve (5) are electrically connected.

4. A novel scrubbing tower system according to claim 2, characterized in that, The bottom liquid level regulating mechanism includes a bottom liquid level gauge (9) and a bottom liquid level regulating valve (6). The bottom liquid level gauge (9) is installed at the bottom of the tower body (17) to monitor the level of the dust removal circulating liquid. The bottom liquid level regulating valve (6) is installed on the discharge pipe connected to the outlet of the filter (7), and the bottom liquid level gauge (9) and the bottom liquid level regulating valve (6) are electrically connected.

5. A novel scrubbing tower system according to any one of claims 1-3, characterized in that, The liquid holding plate (16) has multiple evenly distributed gas rising channels at the same height, and the gas rising channels are equipped with baffles to prevent droplets from falling from the gas rising channels.

6. A novel scrubbing tower system according to claim 1, characterized in that, The spray layer (14) is provided with evenly distributed nozzles for atomizing the cooling circulating liquid from the cooler (2) and distributing it evenly on the packing (15).

7. A novel scrubbing tower system according to claim 1, characterized in that, The demister (13) has a wire mesh structure and is used to capture mist droplets in the gas phase.

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