A waste gas treatment absorption tower for sodium sulfide production

Abstract

The utility model discloses a kind of waste gas treatment absorption towers for sodium sulfide production, including tower body, gas inlet, gas outlet, absorption liquid storage tank, circulating pump, spraying device, gas-liquid separator, waste gas induced draft fan and control device. Tower body is composed of multiple detachable tower sections, multiple spraying layers and filler layer are equipped in each tower section, and high-efficiency filler is used to increase gas-liquid contact area. Gas inlet is located at the bottom of tower body, and is equipped with pretreatment device;Gas outlet is located at the top of tower body. Absorption liquid storage tank is equipped with cooling device, and circulating pump sprays absorption liquid evenly on filler layer. Spraying device uses multi-stage nozzle, with automatic cleaning function. Gas-liquid separator uses multi-stage cyclone separation and high-efficiency filtration technology. Waste gas induced draft fan is equipped with frequency conversion speed regulation function. Control device includes PLC control system and man-machine interface, with fault alarm and automatic shutdown function. The present application can significantly improve the treatment efficiency of waste gas in the production process of sodium sulfide, reduce the emission of harmful gas, meet environmental protection requirements.

Description

Technical Field

[0001] This utility model relates to an absorption tower for treating waste gas in sodium sulfide production. Background Technology

[0002] With increasingly stringent environmental requirements for waste gas treatment during sodium sulfide production, research on related waste gas absorption and treatment devices has deepened. However, in practical applications, existing technologies still have many shortcomings, making it difficult to meet the demands for efficient, stable, and environmentally friendly production. Patent CN1040163 describes a method for selectively producing sodium sulfide or sodium hydrosulfide from synthetic ammonia industrial waste gas. This method purifies hydrogen sulfide from synthetic ammonia waste gas and uses sodium hydroxide solution for absorption to prepare sodium sulfide or sodium hydrosulfide. While this scheme achieves resource utilization of waste gas and allows for flexible selection of product types based on market demand, its absorption process lacks dedicated equipment for efficient absorption and purification of hydrogen sulfide gas in the waste gas. It relies solely on conventional absorption towers for gas treatment, resulting in limited absorption efficiency. Furthermore, high-concentration hydrogen sulfide waste gas treatment is prone to tail gas emission problems, affecting operational safety. Additionally, patent CN107902675B describes a method for the harmless recovery and treatment of byproducts from the synthesis of biphenylacetic acid. This invention addresses the waste liquid containing sodium sulfide and sodium hydroxide generated during the synthesis of biphenylacetic acid. It treats this waste liquid via an oxidation-reduction reaction using hydrochloric acid and hydrogen peroxide, achieving sulfur recovery and waste liquid neutralization. While this method effectively solves the waste liquid treatment problem, it lacks a dedicated absorption device for waste gas treatment. Residual hydrogen sulfide and other harmful gases in the waste gas still require end-of-pipe treatment using traditional absorption towers, which suffer from low absorption efficiency, unstable operation, and poor system resistance to load fluctuations. This makes it difficult to adapt to the complex and variable waste gas emission conditions during sodium sulfide production. In summary, current waste gas treatment devices used in sodium sulfide production generally suffer from low absorption efficiency, poor operational stability, and weak resistance to load fluctuations. They cannot achieve efficient absorption and thorough purification of harmful gases, especially hydrogen sulfide, in the waste gas, thus hindering the overall environmental improvement of sodium sulfide production processes. Therefore, there is an urgent need to provide a waste gas treatment absorption tower for sodium sulfide production that is structurally sound, operationally stable, and highly efficient, to overcome these shortcomings and meet the development needs of modern clean chemical production. Utility Model Content

[0003] The purpose of this invention is to provide an absorption tower for treating waste gas in sodium sulfide production, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] An absorption tower for treating waste gas in sodium sulfide production includes a tower body, an inlet, an outlet, an absorbent liquid storage tank, a circulating pump, a spray device, a gas-liquid separator, a waste gas exhaust fan, and a control device. The absorption tower is designed to improve the treatment efficiency and stability of waste gas during sodium sulfide production, reduce the emission of harmful gases, and ensure environmental protection requirements are met.

[0006] Firstly, the tower body is designed with multiple detachable sections. Each section contains multiple spray layers and packing layers. The packing layers use high-efficiency packing to increase the gas-liquid contact area and improve absorption efficiency. The tower body is also equipped with temperature and pressure sensors to monitor internal environmental parameters in real time, ensuring stable operation.

[0007] Next, the inlet and outlet are designed. The inlet is located at the bottom of the tower, and the outlet is located at the top. This top-bottom design ensures that the exhaust gas has sufficient residence time inside the tower, which is beneficial for the hydrogen sulfide in the exhaust gas to react fully with the absorbent liquid. The inlet is also equipped with a pretreatment device to initially remove large particulate pollutants from the exhaust gas, reducing contamination to the absorption tower.

[0008] Next is the configuration of the absorbent storage tank and circulation pump. The absorbent storage tank stores the absorbent, and the circulation pump pumps the absorbent from the tank into the spraying device. The spraying device evenly sprays the absorbent onto the packing layer, ensuring it fully contacts and reacts with the hydrogen sulfide in the exhaust gas. The absorbent storage tank is also equipped with a cooling device to regulate the temperature of the absorbent and improve absorption efficiency.

[0009] The design of the spray system is also crucial. It employs multi-stage nozzles, each with a different spray angle and density, to ensure the complete absorption of hydrogen sulfide in the exhaust gas. The system also features an automatic cleaning function to prevent nozzle clogging and extend the equipment's lifespan.

[0010] The function of a gas-liquid separator is to separate liquid particles from the waste gas after the absorption reaction is complete, preventing them from being emitted with the waste gas and polluting the environment. Gas-liquid separators employ multi-stage cyclone separation and high-efficiency filtration technology to ensure effective separation.

[0011] The exhaust gas fan is used to discharge the treated exhaust gas from the top of the tower. The fan is equipped with a variable frequency speed control function, which can automatically adjust the air volume according to the amount of exhaust gas emitted, ensuring the stable operation of the absorption tower under different operating conditions.

[0012] The control unit includes a PLC control system and a human-machine interface, used to monitor and control various parameters of the absorption tower, such as temperature, pressure, and absorbent flow rate, to ensure efficient and stable operation of the equipment. The control unit also features fault alarms and automatic shutdown functions to ensure equipment safety.

[0013] Compared with the prior art, the beneficial effects of this utility model are: This utility model provides an absorption tower for treating waste gas in sodium sulfide production. The absorption tower has a reasonable structure, stable operation, and high absorption efficiency, which can significantly improve the treatment effect of waste gas in the sodium sulfide production process, reduce the emission of harmful gases, and meet the development needs of modern chemical clean production. Attached Figure Description

[0014] Figure 1 Schematic diagram of the overall structure of the absorption tower for treating waste gas in sodium sulfide production;

[0015] Figure 2 Schematic diagram of the internal sectional structure of the tower;

[0016] Figure 3 Detailed structural diagram of the spraying device;

[0017] Figure 4 This is a detailed structural diagram of the spraying device.

[0018] In the diagram: 1. Tower body; 2. Air inlet; 3. Air outlet; 4. Absorbent liquid storage tank; 5. Circulating pump; 6. Spraying device; 7. Gas-liquid separator; 8. Exhaust gas exhaust fan; 9. Control device; 10. Tower section; 11. Spraying layer; 12. Packing layer; 13. Temperature sensor; 14. Pressure sensor; 15. Multi-stage nozzle; 16. Automatic cleaning device. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Figures 1 to 4 This invention illustrates a specific embodiment of an absorption tower for treating waste gas in sodium sulfide production. This absorption tower is primarily used for treating waste gas containing hydrogen sulfide generated during sodium sulfide production, aiming to improve waste gas treatment efficiency and stability, reduce harmful gas emissions, and ensure compliance with environmental protection requirements. The specific embodiments of this invention are described in detail below with reference to the accompanying drawings.

[0021] Figure 1-2This is a schematic diagram of the overall structure of this utility model. As shown in the figure, the waste gas treatment absorption tower for sodium sulfide production mainly includes a tower body 1, an inlet 2, an outlet 3, an absorbent liquid storage tank 4, a circulating pump 5, a spray device 6, a gas-liquid separator 7, a waste gas exhaust fan 8, and a control device 9. The tower body 1 is composed of multiple detachable tower sections 10, a design that facilitates tower maintenance and replacement. Each tower section 10 has multiple spray layers 11 and packing layers 12 inside. The packing layers 12 use high-efficiency packing to increase the gas-liquid contact area and improve the absorption efficiency of hydrogen sulfide. The tower body 1 is also equipped with a temperature sensor 13 and a pressure sensor 14 for real-time monitoring of environmental parameters inside the tower to ensure stable operation of the equipment.

[0022] Figure 3 This is a schematic diagram of the internal structure of the tower. As shown, each tower section 10 contains multiple spray layers 11 and packing layers 12. The spray layers 11 are located above the packing layers 12. Absorbent liquid is pumped from the absorbent storage tank 4 by the circulating pump 5 and then evenly sprayed onto the packing layers 12 by the spraying device 6, ensuring sufficient contact and reaction with the hydrogen sulfide in the exhaust gas. The packing layers 12 use high-efficiency packing, such as Pall rings, Raschig rings, or a combination of Pall rings. These packings have a large specific surface area, significantly increasing the gas-liquid contact area and improving the absorption efficiency of hydrogen sulfide. Temperature sensors 13 and pressure sensors 14 are installed on the inner wall and bottom of the tower body 1, respectively, to monitor changes in temperature and pressure within the tower. When the temperature or pressure exceeds the set range, the control device 9 automatically adjusts the flow rate of the circulating pump 5 and the spray density of the spraying device 6 to ensure the stability of the environmental parameters within the tower.

[0023] Figure 4 This is a detailed structural diagram of the spray device. The spray device 6 includes multi-stage nozzles 15, each with a different spray angle and spray density to ensure that hydrogen sulfide gas in the waste gas can be completely absorbed. Specifically, the first-stage nozzle 15a of the spray device 6 is mainly responsible for the initial spray, with a spray angle of 30° and a spray density of 200 L / m²·h; the second-stage nozzle 15b is responsible for the middle spray, with a spray angle of 45° and a spray density of 150 L / m²·h; and the third-stage nozzle 15c is responsible for the final spray, with a spray angle of 60° and a spray density of 100 L / m²·h. This multi-stage nozzle design ensures that the absorbent is evenly distributed within the tower, reduces dead zones, and improves absorption efficiency. In addition, the spray device 6 is also equipped with an automatic cleaning device 16, which includes a high-pressure nozzle and a cleaning pipe. When the nozzle 15 is detected to be blocked, the automatic cleaning device 16 will start and spray cleaning fluid through the high-pressure nozzle to remove the blockage inside the nozzle 15, ensuring that the nozzle 15 can run smoothly and for a long time.

[0024] The air inlet 2 is located at the bottom of the tower body 1, and the exhaust gas enters the absorption tower through the air inlet 2. A pretreatment device is installed at the air inlet 2, which includes a filter screen and a cyclone separator. The filter screen is used to initially remove large particulate pollutants from the exhaust gas, preventing them from entering the tower body and contaminating the packing layer 12 and the spray device 6. The cyclone separator is used to further separate particulate matter from the exhaust gas, ensuring that the exhaust gas entering the tower body 1 is relatively clean and improving the subsequent treatment effect. The design of the pretreatment device can significantly extend the service life of the absorption tower and reduce maintenance costs.

[0025] The exhaust port 3 is located at the top of the tower body 1, and the treated waste gas is discharged through the exhaust port 3. The gas-liquid separator 7 is installed below the exhaust port 3 to separate liquid particles from the waste gas after the absorption reaction, preventing them from being discharged with the waste gas and polluting the environment. The gas-liquid separator 7 employs multi-stage cyclone separation and high-efficiency filtration technology. The first-stage cyclone separator removes larger droplets, and the second-stage high-efficiency filter removes fine droplets and particulate matter. The design of the gas-liquid separator 7 ensures a separation efficiency of over 99%, effectively preventing droplets from being discharged with the waste gas.

[0026] The absorbent storage tank 4 is used to store the absorbent, which is typically a sodium hydroxide solution. Tank 4 is equipped with a cooling device, including cooling coils and a cooling water circulation system. The cooling coils are located on the inner wall of tank 4, and the cooling water circulation system uses a circulating pump to deliver cooling water to the cooling coils, regulating the temperature of the absorbent. The cooling device is designed to ensure that the temperature of the absorbent is maintained at approximately 25°C, improving the absorption efficiency of hydrogen sulfide. Tank 4 is also equipped with a level sensor to monitor changes in the absorbent level. When the level falls below a set value, the control device 9 automatically activates the replenishment system to ensure an adequate supply of absorbent.

[0027] The circulating pump 5 is used to pump the absorbent from the storage tank 4 into the spray device 6. The circulating pump 5 is made of corrosion-resistant materials, such as stainless steel or PP, to accommodate sodium hydroxide solutions of a certain concentration. The circulating pump 5 is equipped with a variable frequency speed control function, which can automatically adjust the flow rate according to changes in environmental parameters within the tower, ensuring that the spray density and spray angle of the spray device 6 are maintained at the optimal level. The variable frequency speed control function improves the adaptability and flexibility of the absorption tower, ensuring stable operation under different working conditions.

[0028] A spraying device 6 is installed at the top of the tower body 1 to uniformly spray the absorbent onto the packing layer 12. The spraying device 6 consists of multiple stages of nozzles 15, each nozzle 15 connected to the circulating pump 5 via a pipe. The first-stage nozzle 15a is located at the top of the tower body 1, with a spray angle of 30° and a spray density of 200 L / m²·h; the second-stage nozzle 15b is located in the middle of the tower body 1, with a spray angle of 45° and a spray density of 150 L / m²·h; and the third-stage nozzle 15c is located at the bottom of the tower body 1, with a spray angle of 60° and a spray density of 100 L / m²·h. This multi-stage nozzle design ensures uniform distribution of the absorbent within the tower body, forming a continuous gas-liquid contact layer and improving the absorption efficiency of hydrogen sulfide. The spraying device 6 also includes an automatic cleaning device 16, which comprises high-pressure nozzles and cleaning pipes. High-pressure nozzles are positioned above each nozzle 15. When a nozzle 15 is detected to be clogged, cleaning fluid is supplied through the cleaning pipeline and sprayed through the high-pressure nozzles to remove blockages inside the nozzle 15, ensuring unobstructed operation and long-term maintenance. The automatic cleaning device 16 is designed to significantly reduce maintenance frequency and improve equipment operating efficiency.

[0029] The gas-liquid separator 7 is installed at the top of the tower body 1 to separate liquid particles from the treated waste gas. For example... Figure 1 and Figure 2 As shown, the gas-liquid separator 7 includes a first-stage cyclone separator and a second-stage high-efficiency filter. The first-stage cyclone separator is located below the top of the tower body 1 and is used to remove larger droplets. The cyclone separator contains multiple cyclone tubes; when exhaust gas passes through these tubes, larger droplets are separated due to inertia and accumulate at the bottom of the cyclone separator, then discharged through the drain pipe. The second-stage high-efficiency filter is located above the cyclone separator and is used to remove fine droplets and particulate matter. The high-efficiency filter contains multiple filter elements; when exhaust gas passes through these elements, fine droplets and particulate matter are filtered out, ensuring that the discharged exhaust gas is relatively clean and meets environmental standards. The design of the gas-liquid separator 7 ensures a separation efficiency of over 99%, effectively preventing droplets from being discharged with the exhaust gas and polluting the environment.

[0030] The exhaust gas fan 8 is used to discharge the treated exhaust gas from the top of the tower body 1. The exhaust gas fan 8 is located above the exhaust port 3 and connected to the top of the tower body 1 via a pipe. The exhaust gas fan 8 adopts variable frequency speed control technology, automatically adjusting the airflow according to the exhaust gas emission volume. When the exhaust gas emission volume is large, the exhaust gas fan 8 automatically increases the airflow to ensure timely discharge of the exhaust gas; when the exhaust gas emission volume is small, the exhaust gas fan 8 automatically reduces the airflow to reduce energy consumption. The variable frequency speed control technology design can improve the operating efficiency of the absorption tower and ensure stable operation under different operating conditions.

[0031] Control device 9 is used to monitor and control various parameters of the absorption tower, such as temperature, pressure, and absorbent flow rate, to ensure efficient and stable operation of the equipment. Figure 1 As shown, the control device 9 includes a PLC control system and a human-machine interface (HMI). The PLC control system is connected to temperature sensor 13, pressure sensor 14, liquid level sensor, spray device 6, and exhaust gas fan 8 via data cables. It monitors the environmental parameters inside the tower in real time and automatically adjusts the operating status of each device based on the monitoring results. For example, when temperature sensor 13 detects that the temperature inside the tower is too high, the PLC control system will activate the cooling device to lower the temperature of the absorbent; when pressure sensor 14 detects that the pressure inside the tower is too high, the PLC control system will adjust the airflow of the exhaust gas fan 8 to lower the pressure inside the tower. The HMI is located at the front end of the control device 9, allowing operators to view the environmental parameters inside the tower in real time and make manual adjustments. The HMI also has a fault alarm function; when the system detects a fault, it will automatically issue an alarm signal and stop the operation of the relevant equipment to ensure equipment safety.

[0032] The working principle of the waste gas treatment absorption tower for sodium sulfide production of this utility model is as follows: Waste gas containing hydrogen sulfide generated during the sodium sulfide production process enters the tower body 1 through inlet 2. The pretreatment device at inlet 2 initially removes large particulate pollutants in the waste gas, reducing pollution to the packing layer 12 and spray device 6 inside the tower body. After entering the tower body 1, the waste gas flows upward through the bottom inlet 2, making full contact with the absorbent liquid uniformly sprayed from the spray device 6. The first-stage nozzle 15a, the second-stage nozzle 15b, and the third-stage nozzle 15c of the spray device 6 spray the absorbent liquid at the upper, middle, and lower parts of the tower body 1, respectively, forming a continuous gas-liquid contact layer, increasing the gas-liquid contact area, and improving the absorption efficiency of hydrogen sulfide. During the absorption process, hydrogen sulfide reacts chemically with the sodium hydroxide solution to generate sodium sulfide and water, which are then captured and removed by the absorbent liquid. The temperature and pressure inside the tower are monitored in real time by temperature sensor 13 and pressure sensor 14. When the temperature or pressure exceeds the set range, the control device 9 will automatically adjust the flow rate of the circulating pump 5 and the spray density of the spray device 6 to ensure the stability of the environmental parameters inside the tower.

[0033] After the absorption reaction is complete, the waste gas enters the final treatment stage through the gas-liquid separator 7. The first-stage cyclone separator in the gas-liquid separator 7 removes larger droplets, and the second-stage high-efficiency filter removes fine droplets and particulate matter, ensuring that the discharged waste gas is relatively clean. The treated waste gas is discharged through the outlet 3, and the exhaust fan 8 automatically adjusts the airflow to ensure timely discharge. The absorbent liquid continuously circulates during the spraying process, and its temperature is regulated by a cooling device to ensure the absorption effect. A level sensor monitors the liquid level changes in the absorbent liquid storage tank 4 in real time. When the liquid level falls below the set value, the control device 9 automatically activates the replenishment system to ensure an adequate supply of absorbent liquid.

[0034] In practical applications, this sodium sulfide production waste gas treatment absorption tower can be used in various sodium sulfide production plants. For example, in a sodium sulfide production plant with an annual output of 5,000 tons, the tower body 1 of the waste gas treatment absorption tower is 20 meters high and 3 meters in diameter, composed of 4 detachable tower sections 10. Each tower section 10 has 3 spray layers 11 and 4 packing layers 12. The packing layers 12 use Pall ring composite packing, and the filling height of each packing layer is 0.5 meters. The absorption liquid storage tank 4 has a volume of 50 cubic meters, the cooling coil of the cooling device is 100 meters long, and the liquid level sensor has a range of 0-6 meters. The circulating pump 5 has a flow rate of 30 cubic meters per hour. The multi-stage spray nozzles 15 of the spray device 6 are located at the top, middle, and bottom of the tower body 1. The first-stage nozzle 15a has a spray angle of 30° and a spray density of 200 L / m²·h; the second-stage nozzle 15b has a spray angle of 45° and a spray density of 150 L / m²·h; and the third-stage nozzle 15c has a spray angle of 60° and a spray density of 100 L / m²·h. The gas-liquid separator 7 has a height of 2 meters and a diameter of 2.5 meters. The first-stage cyclone separator has 20 cyclone tubes, and the second-stage high-efficiency filter has 10 filter elements. The exhaust gas fan 8 has an air volume of 15,000 cubic meters per hour and a variable frequency speed control range of 0-100%. The PLC control system of control device 9 adopts Siemens S7-1200 series, the human-machine interface adopts touch screen, and the fault alarm function supports multiple alarm signal outputs, such as audible and visual alarms, SMS alarms and remote alarms.

[0035] The working process of the sodium sulfide production waste gas treatment absorption tower is as follows: First, the waste gas containing hydrogen sulfide generated during the sodium sulfide production process enters the tower body 1 through inlet 2. The pretreatment device 1 at inlet 2 removes large particulate pollutants from the waste gas through a filter and cyclone separator, reducing contamination of the packing layer 12 and spray device 6 inside the tower body. The treated waste gas enters the bottom section of the tower body 1 and flows upward through inlet 2. Inside the tower section, the waste gas comes into full contact with the absorbent liquid uniformly sprayed from the first-stage nozzle 15a, undergoing a chemical reaction to generate sodium sulfide and water. The waste gas continues to flow upward, entering the tower section again, where it comes into contact again with the absorbent liquid uniformly sprayed from the second-stage nozzle 15b, further removing unreacted hydrogen sulfide. The waste gas continues to flow upward, entering the tower section again, where it comes into third contact with the absorbent liquid uniformly sprayed from the third-stage nozzle 15c, ensuring that the hydrogen sulfide in the waste gas is completely absorbed. The waste gas continues to flow upward within the tower section, undergoing gas-liquid separation treatment through the gas-liquid separator 7. The first-stage cyclone separator of the gas-liquid separator 7 removes larger droplets, while the second-stage high-efficiency filter removes fine droplets and particulate matter, ensuring that the discharged exhaust gas is relatively clean. The treated exhaust gas is discharged through the exhaust port 3, and the exhaust gas fan 8 automatically adjusts the air volume to ensure timely discharge of the exhaust gas.

[0036] The absorbent liquid circulates continuously during the spraying process, pumped from the storage tank 4 into the spraying device 6 via the circulation pump 5. The spraying device 6 evenly sprays the absorbent liquid onto the packing layer 12. The absorbent liquid storage tank 4 is also equipped with a cooling device, which regulates the temperature of the absorbent liquid through cooling coils to ensure the absorption effect. A liquid level sensor monitors the liquid level changes in the absorbent liquid storage tank 4 in real time. When the liquid level is lower than the set value, the control device 9 automatically starts the liquid replenishment system to ensure an adequate supply of absorbent liquid. The PLC control system of the control device 9 is connected to the temperature sensor 13, pressure sensor 14, liquid level sensor, spraying device 6, and exhaust gas fan 8 via data cables. It monitors the environmental parameters inside the tower in real time and automatically adjusts the operating status of each device based on the monitoring results. For example, when the temperature sensor 13 detects that the temperature inside the tower is too high, the PLC control system will start the cooling device to lower the temperature of the absorbent liquid; when the pressure sensor 14 detects that the pressure inside the tower is too high, the PLC control system will adjust the airflow of the exhaust gas fan 8 to lower the pressure inside the tower. The human-machine interface is located at the front end of the control device 9, allowing operators to view real-time environmental parameters within the tower and make manual adjustments. The interface also features a fault alarm function; when the system detects a fault, it automatically issues an alarm signal and stops the operation of the relevant equipment to ensure equipment safety.

[0037] In summary, this utility model provides an absorption tower for treating waste gas in sodium sulfide production. This absorption tower has a reasonable structure, stable operation, and high absorption efficiency, significantly improving the treatment effect of waste gas during sodium sulfide production, reducing the emission of harmful gases, and meeting the development needs of modern clean chemical production. The design of multi-section tower sections 10, multi-stage nozzles 15, and a gas-liquid separator 7 ensures the complete absorption and separation of hydrogen sulfide in the waste gas. The combination of a cooling device and variable frequency speed control technology ensures efficient and stable operation of the absorption tower under different operating conditions. The design of the PLC control system and human-machine interface in the control device 9 allows operators to monitor and adjust the environmental parameters inside the tower in real time, ensuring the safe and reliable operation of the equipment.

Claims

1. An absorption tower for treating waste gas in sodium sulfide production, characterized in that: It includes a tower body (1), an air inlet (2), an air outlet (3), an absorbent storage tank (4), a circulating pump (5), a spray device (6), a gas-liquid separator (7), an exhaust fan (8), and a control device (9); The tower body (1) is composed of multiple detachable tower sections (10), and each tower section (10) is provided with multiple spray layers (11) and packing layers (12), and the packing layers (12) are made of high-efficiency packing. The air inlet (2) is located at the bottom of the tower body (1) and is equipped with a pretreatment device for the preliminary removal of large particulate pollutants in the exhaust gas; The air outlet (3) is located at the top of the tower body (1); The absorbent storage tank (4) is equipped with a cooling device for regulating the temperature of the absorbent. The cooling device includes a cooling coil and a cooling water circulation system. The circulating pump (5) is used to pump the absorbent from the absorbent storage tank (4) into the spraying device (6). The spraying device (6) is located on the upper part of the tower body (1) and includes multi-stage nozzles (15). Each nozzle (15) has a different spraying angle and spraying density, which is used to spray the absorbent liquid evenly on the packing layer (12). The spraying device (6) is also equipped with an automatic cleaning device (16) to prevent the nozzles (15) from clogging. The gas-liquid separator (7) is located at the top of the tower body (1) and includes a first-stage cyclone separator and a second-stage high-efficiency filter for separating liquid particles in the treated waste gas. The exhaust gas fan (8) is used to discharge the treated exhaust gas from the top of the tower (1), and is equipped with a variable frequency speed regulation function to automatically adjust the air volume according to the amount of exhaust gas discharged. The control device (9) includes a PLC control system and a human-machine interface, which are used to monitor and control various parameters of the absorption tower in real time. The tower body (1) is equipped with a temperature sensor (13) and a pressure sensor (14) for real-time monitoring of environmental parameters inside the tower.

2. The absorption tower for treating waste gas in sodium sulfide production according to claim 1, characterized in that: The packing layer (12) uses Pall rings, Raschig rings or a combination of Pall rings.

3. The absorption tower for treating waste gas in sodium sulfide production according to claim 1, characterized in that: The pretreatment device includes a filter screen and a cyclone separator.

4. The absorption tower for treating waste gas in sodium sulfide production according to claim 1, characterized in that: The multi-stage nozzle (15) includes a first-stage nozzle located on the upper part of the tower body (1), a second-stage nozzle located in the middle part of the tower body (1), and a third-stage nozzle located on the lower part of the tower body (1).

5. The absorption tower for treating waste gas in sodium sulfide production according to claim 1, characterized in that: The first-stage cyclone separator has multiple cyclone tubes inside to remove larger droplets; the second-stage high-efficiency filter has multiple filter elements inside to remove fine droplets and particulate matter.

6. The absorption tower for treating waste gas in sodium sulfide production according to claim 1, characterized in that: The variable frequency speed regulation range of the exhaust gas induced draft fan (8) is 0 to 100%.

7. The absorption tower for treating waste gas in sodium sulfide production according to claim 1, characterized in that: The control device (9) also has a fault alarm function and an automatic shutdown function.

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