Gemini tail gas washing tower

Abstract

The gemini tail gas washing tower comprises a first sub-tower and a second sub-tower which are arranged in parallel, a first gas inlet is formed in the bottom end of the back side of the first sub-tower, and a second gas inlet is formed in the bottom end of the back side of the second sub-tower; a first liquid discharging pipe is arranged at the bottom end of the first sub-tower close to the second sub-tower, and a second liquid discharging pipe is arranged at the bottom end of the second sub-tower close to the first sub-tower; the first liquid discharging pipe is a bent pipe, the second liquid discharging pipe is a straight pipe, and the two pipes extend into the circulating slurry pond below. And the left and right paths of flue gas are oppositely conveyed to the first sub-tower and the second sub-tower, so that the flue gas is ensured not to generate opposite impact to influence the front-end process characteristics, and relatively high flue gas washing efficiency is maintained. The twin towers on the two sides can be independently designed according to different working conditions, and the changing unstable working conditions of hazardous waste resource disposal can be dealt with.

Description

Technical Field

[0001] This utility model relates to the technical field of waste gas treatment equipment, and in particular to a twin tail gas scrubbing tower. Background Technology

[0002] Traditional flue gas purification towers typically collect all flue gas into a single scrubbing tower for treatment. When the air inlets are located on different walls of the tower, on the one hand, flue gas backlash is very likely to occur, which has a significant impact on the upstream process fans; on the other hand, it is not easy to make targeted adjustments when the flue gas conditions on both sides fluctuate, making it difficult to guarantee scrubbing efficiency; finally, the mixing of flue gas with different characteristics on both sides requires the entire tower to undergo the same anti-corrosion treatment, which increases construction costs.

[0003] Chinese Patent Publication No. CN216395859U, Publication Date: April 29, 2022, discloses a Chinese patent entitled "A Vertical Scrubber Tower". The scrubber tower includes a tower body with a first air inlet and a first air outlet. The tower body also has a second air inlet and a second air outlet. The first air inlet and the first air outlet are located on the side walls of the tower body, the second air inlet and the second air outlet are located on the rear wall of the tower body, and the middle air outlet is located on the top wall of the tower body. In this scrubber tower, the flue gas is prone to collision on different walls of the tower body, and it is not easy to make targeted adjustments to the flue gas on both sides, making it difficult to guarantee the scrubbing efficiency. Utility Model Content

[0004] This invention provides a twin exhaust gas scrubbing tower. By setting up a first sub-tower and a second sub-tower, it prevents flue gas from colliding, facilitates targeted adjustments for different flue gases, ensures scrubbing efficiency, and reduces maintenance costs.

[0005] To achieve the above objectives, this utility model employs the following technical advantages: A twin-tower exhaust gas scrubbing tower includes a first sub-tower and a second sub-tower arranged side-by-side. The first sub-tower has a first air inlet at its bottom end facing away from the second sub-tower, and the second sub-tower has a second air inlet at its bottom end facing away from the second sub-tower. A first liquid discharge pipe is located at the bottom end of the first sub-tower near the second sub-tower, and a second liquid discharge pipe is located at the bottom end of the second sub-tower near the first sub-tower. The first liquid discharge pipe is a bend, and the second liquid discharge pipe is a straight pipe, both extending into the circulating slurry pool below. The flue gas from both sides is directed to the first and second sub-towers, ensuring that the flue gas does not counteract the upstream process characteristics and maintaining a high flue gas scrubbing efficiency. The first and second sub-towers on both sides can be designed independently according to different operating conditions, which is beneficial for coping with the variable and unstable operating conditions of hazardous waste resource utilization. Remote control can replace manual operation for adjustments, greatly improving safety performance and simultaneously enhancing the automation level and work efficiency of the entire system.

[0006] Preferably, the first air inlet is connected to the first induced draft fan, and the second air inlet is connected to the second induced draft fan. The first induced draft fan is used to send the flue gas from the left side into the first sub-tower through the first air inlet, and the second induced draft fan is used to send the flue gas from the right side into the second sub-tower through the second air inlet. By setting the first and second induced draft fans separately, the flow rate of flue gas entering the first and second sub-towers can be precisely controlled, ensuring that the flue gas is evenly distributed in the two sub-towers and improving the scrubbing efficiency. At the same time, the independent control of the induced draft fans can flexibly respond to changes in flue gas flow rate under different operating conditions, enhancing the adaptability and stability of the system.

[0007] Preferably, the first sub-tower has a first air outlet at its top, and the second sub-tower has a second air outlet at its top. Having independent air outlets allows for separate monitoring and control of the air quality from the two sub-towers, ensuring that the scrubbed flue gas meets environmental standards.

[0008] Preferably, the first and second gas outlets are merged and connected to the desulfurization tower at the top. Two separate absorption tower systems are set up to receive the flue gas, namely a first sub-tower and a second sub-tower. The clean flue gas from the top of the first and second sub-towers is ultimately merged and sent to the primary desulfurization tower. Merging the clean flue gas from the two sub-towers before sending it to the desulfurization tower allows for centralized treatment, improving desulfurization efficiency and reducing the number of equipment and operating costs. Simultaneously, the merged flue gas flow is more stable, which is conducive to the efficient operation of the desulfurization tower and further improves the overall treatment effect of the system.

[0009] Preferably, the first and second sub-towers are equipped with several spray layers. The slurry in the circulating slurry tank is pumped to the respective spray layers of the first and second sub-towers via a circulating pump to wash the flue gas. Multiple spray layers allow for repeated washing of the flue gas, improving the washing effect and ensuring that pollutants in the flue gas are fully removed. Simultaneously, the multiple spray layers allow for segmented control of the spray liquid flow rate and concentration, optimizing the system according to different flue gas compositions and operating conditions, thus improving the system's flexibility and adaptability.

[0010] Preferably, the first and second sub-towers are connected above the air inlet via several circulating pumps and a circulating slurry tank. This connection ensures that the slurry circulation systems within the two sub-towers complement each other, maintaining the uniformity and stability of the slurry. This helps improve washing efficiency, reduce slurry waste, and lower operating costs.

[0011] Preferably, the circulating pump connects to a siphon tank and a circulating slurry pool. The siphon tank utilizes the siphon effect to reduce the energy consumption during the start-up and operation of the circulating pump, improving the system's energy efficiency. Simultaneously, the siphon tank stabilizes the slurry flow, reduces pump wear, extends equipment lifespan, and enhances system reliability and economy.

[0012] Preferably, a vent valve is installed on the side of the siphon tank near the circulating slurry tank. The vent valve allows for the convenient discharge of gas and impurities from the siphon tank, preventing gas buildup and ensuring optimal siphon performance. Simultaneously, the vent valve enables rapid emptying of the siphon tank during system maintenance and repair, improving maintenance efficiency and ensuring the normal operation of the system.

[0013] Preferably, the upper part of the first discharge pipe is an S-shaped bend that bends towards the second discharge pipe. The S-shaped bend increases the flow path of the slurry, reduces slurry deposition and blockage in the discharge pipe, and improves the fluidity and uniformity of the slurry. At the same time, the S-shaped bend can also act as a buffer, reducing the impact of the slurry on the circulating slurry tank, protecting the tank wall, and extending the service life of the equipment.

[0014] Preferably, the lower half of the first discharge pipe is a straight pipe, with its bottom end at the same level as the second discharge pipe. The circulating slurry pools at the bottom of the first and second sub-towers are connected, allowing circulating slurries of different concentrations to converge, ensuring the stability of the circulating liquid properties under different flue gas conditions on both sides. The straight pipe design ensures smooth flow of slurry into the circulating slurry pool, reducing resistance within the pipe and improving circulation efficiency. Simultaneously, having the bottom ends of both discharge pipes at the same level ensures more uniform slurry convergence on both sides, maintaining stable circulating liquid properties and improving the overall performance and stability of the system.

[0015] The beneficial effects of this utility model are as follows: This utility model provides a twin-tower exhaust gas scrubbing tower. By setting up a first sub-tower and a second sub-tower, it ensures that the flue gas does not cause adverse effects on the upstream process characteristics, thus maintaining a high flue gas scrubbing efficiency. The first and second sub-towers on both sides can be designed independently according to different operating conditions, which is beneficial for dealing with the variable and unstable operating conditions of hazardous waste resource utilization. Remote control can be used to replace manual operation for adjustment, greatly improving safety performance, while also improving the automation level and work efficiency of the entire system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the washing circulation system of this utility model.

[0018] Figure 3 This is a schematic diagram of the lower liquid pipe structure of this utility model.

[0019] Reference numerals in the attached diagram: 1: First sub-tower; 2: Second sub-tower; 3: Circulating slurry tank; 4: Spray layer; 5: Circulating pump; 6: First liquid discharge pipe; 7: Second liquid discharge pipe; 8: First induced draft fan; 9: Second induced draft fan; 10: Siphon tank; 11: Vent valve. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] This utility model relates to a twin-tower exhaust gas scrubber, an innovative exhaust gas treatment device designed to solve a series of problems faced by traditional exhaust gas scrubbers when the inlets are located on different walls of the tower body to treat complex flue gas. These problems include the ease with which flue gas backlash occurs, significantly impacting the upstream process fans; difficulty in adjusting to fluctuations in flue gas conditions on both sides, making it difficult to guarantee scrubbing efficiency; and the need for the entire tower body to undergo the same anti-corrosion treatment after the flue gas with different characteristics on both sides is mixed, increasing construction costs. It mainly consists of a first sub-tower 1 and a second sub-tower 2 arranged in parallel, and these two sub-towers play a core role in the entire exhaust gas treatment system.

[0022] like Figure 1 and Figure 2 As shown, the first sub-tower 1 and the second sub-tower 2 stand side by side, and this parallel arrangement forms the basis of the entire scrubbing tower design. The first sub-tower 1 has a first air inlet at its back-side bottom end, while the second sub-tower 2 has a second air inlet at its back-side bottom end. In the actual exhaust gas treatment process, the flue gas with different characteristics from the left and right sides will enter the scrubbing tower through these two air inlets respectively. To accurately introduce the flue gas into the sub-towers, the first air inlet is connected to a first induced draft fan 8, and the second air inlet is connected to a second induced draft fan 9. The function of the first induced draft fan 8 is to send the flue gas from the left side through the first air inlet into the first sub-tower 1, while the second induced draft fan 9 is responsible for sending the flue gas from the right side through the second air inlet into the second sub-tower 2. The placement of these two induced draft fans is crucial, as they can precisely control the flow rate of the flue gas entering the first sub-tower 1 and the second sub-tower 2. For example, under different production conditions, the flue gas flow rates on the left and right sides may differ. By independently controlling the speed, power, and other parameters of the first induced draft fan 8 and the second induced draft fan 9, it can be ensured that the flue gas is evenly distributed in the two sub-towers, allowing each sub-tower to receive a sufficient and appropriate amount of flue gas, thereby improving scrubbing efficiency. Moreover, this independently controlled induced draft fan setup gives the system strong adaptability and stability. When production conditions change, such as a sudden increase or decrease in the flue gas flow rate, operators can quickly adjust the operating status of the corresponding induced draft fans to flexibly respond to changes in flue gas flow rate under different conditions, ensuring that the entire exhaust gas treatment system can operate continuously and stably, avoiding problems such as insufficient scrubbing or scrubbing tower overload caused by flow rate changes.

[0023] like Figure 1As shown, a first exhaust port and a second exhaust port are respectively located at the top of the first sub-tower 1 and the second sub-tower 2. These two exhaust ports have important functions; they not only serve as channels for the discharged scrubbed flue gas but also allow for separate monitoring and control of the exhaust gas quality from each sub-tower. In actual operation, by installing corresponding monitoring equipment, such as gas composition analyzers and flow monitors, at the first and second exhaust ports, the quality status of the flue gas discharged from the first and second sub-towers can be monitored in real time, including parameters such as pollutant removal, gas flow rate, and temperature. This ensures that the scrubbed flue gas discharged from both sub-towers meets environmental standards. If the exhaust gas from one sub-tower fails to meet requirements, the operating parameters of that sub-tower can be adjusted accordingly, ensuring the overall treatment effect of the exhaust gas treatment system and avoiding problems of inaccurate monitoring and untimely adjustments caused by a single exhaust port.

[0024] like Figure 2 As shown, the air inlets of the first sub-tower 1 and the second sub-tower 2 are connected to a circulating slurry tank 3 via several circulating pumps 5. Preferably, each sub-tower is equipped with three circulating pumps 5, meaning that the first sub-tower 1 and the second sub-tower 2 each have three main circulating slurry channels. The main circulating slurry channels at the bottom branch into two secondary circulating slurry channels near the two sub-towers, entering the sub-towers from different heights. The circulating slurry tank 3 serves as the source of the washing slurry, and the slurry stored inside is transported by the circulating pumps 5 to the respective spray layers 4 of the first and second sub-towers. In this process, the circulating pumps 5 play a crucial role, delivering the slurry from the circulating slurry tank 3 to the first and second sub-towers 1 and 2 at a certain pressure and flow rate. The circulating slurry tank 3 is a vital support for the entire washing system, providing sufficient slurry resources for the washing process. This connection between the circulating pumps 5 and the circulating slurry tank 3 ensures that the slurry circulation systems within the first and second sub-towers 1 and 2 complement each other, maintaining the uniformity and stability of the slurry. This design has significant advantages. On the one hand, it helps improve washing efficiency because a stable and uniform slurry can ensure the best washing effect in each spray layer 4. On the other hand, it can reduce slurry waste and avoid situations where some areas overuse slurry and some areas have insufficient slurry due to uneven slurry distribution, thereby reducing operating costs.

[0025] like Figure 2As shown, the circulating pump 5 is connected to the circulating slurry tank 3 via a siphon tank 10. The siphon tank 10 utilizes the siphon effect to provide an efficient and energy-saving method for slurry circulation. In this embodiment, the siphon tank 10 is preferably installed. The utilization of the siphon effect reduces the energy required for the circulating pump 5 during startup and operation, significantly improving the system's energy efficiency. Simultaneously, the siphon tank 10 stabilizes the slurry flow, preventing impacts and wear on the circulating pump 5 caused by unstable slurry flow. Over long-term operation, this greatly extends the equipment's service life and improves the system's reliability and economy. To ensure the normal operation of the siphon tank 10, a vent valve 11 is provided on the side of the siphon tank 10 near the circulating slurry tank 3. This vent valve 11 plays a crucial role. During system operation, gas or impurities may enter the siphon tank 10, affecting the siphon effect and causing interruptions or instability in the siphon process. By periodically opening the vent valve 11, gas and impurities can be easily discharged from the siphon tank 10, ensuring a continuous and stable siphon process. During system maintenance and repair, the vent valve 11 plays a crucial role. It can quickly empty the siphon tank 10, making it convenient for staff to perform internal inspections, cleaning, or repairs on the siphon tank 10, thereby improving maintenance efficiency and ensuring the normal operation of the system.

[0026] like Figure 1 As shown, the first sub-tower 1 and the second sub-tower 2 are equipped with several spray layers 4, which are key components for achieving flue gas scrubbing. In this embodiment, three spray layers 4 are preferably provided. When the slurry in the circulating slurry tank 3 is transported to the spray layers 4 of the first sub-tower 1 and the second sub-tower 2 via the circulating pump 5, a multi-layer spraying effect is achieved. The design of the multi-layer spray layer 4 has several advantages. First, it can scrub the flue gas multiple times, much like multiple filtrations, ensuring that pollutants in the flue gas are fully removed. For example, for some complex pollutants, a single spray may not be sufficient to remove them completely. The multi-layer spray layer 4 allows for segmented control by setting different slurry components and flow rates in different spray layers 4 for different pollutant compositions and concentrations. In actual operation, for flue gas containing multiple pollutants, such as flue gas simultaneously containing dust, acidic gases, and harmful organic matter, a slurry with dust removal and preliminary neutralization of acidic gases can be used in the bottom spray layer 4, a scrubbing liquid specifically targeting particular organic matter can be used in the middle spray layer 4, and a slurry for further removing residual pollutants can be used in the top spray layer 4. Such tiered control can be optimized according to different flue gas compositions and operating conditions, improving the system's flexibility and adaptability, and making the washing effect more significant.

[0027] like Figure 3As shown, the bottoms of the first sub-tower 1 and the second sub-tower 2 also have carefully designed liquid discharge pipes. The longitudinal section of the bottom of the first sub-tower 1 and the second sub-tower 2 is an obtuse triangle. The bottom of the first sub-tower 1 is biased towards the second sub-tower 2, and the bottom of the second sub-tower 2 is biased towards the first sub-tower 1. The first liquid discharge pipe 6 is located at the obtuse angle of the obtuse triangle at the bottom of the first sub-tower 1, and the second liquid discharge pipe 7 is located at the obtuse angle of the obtuse triangle at the bottom of the second sub-tower 2. They are channels for sending the washed slurry back to the circulating slurry tank 3. The first liquid discharge pipe 6 and the second liquid discharge pipe 7 are structurally different. The upper half of the first liquid discharge pipe 6 is an S-shaped bend that bends towards the second liquid discharge pipe 7. The S-shaped bend is centrally symmetrical, with bends at both ends and a straight section in the middle. The bending curvature of the bends at both ends is preferably 60 degrees. The lower half of the first liquid discharge pipe 6 is a straight section, and its bottom end is on the same horizontal plane as the second liquid discharge pipe 7; while the second liquid discharge pipe 7 is a straight section. The S-shaped bend in the first discharge pipe 6 serves a unique function: it increases the flow path of the slurry, reducing the risk of sedimentation and blockage due to the extended path. This is because in traditional straight discharge pipes, uneven flow velocity or impurity sedimentation can cause blockages, while the S-shaped bend creates turbulence, preventing sedimentation. Simultaneously, the S-shaped bend acts as a buffer, slowing the slurry flow rate as it flows at high speed from the sub-tower, reducing impact on the circulating slurry tank 3, protecting the tank walls from prolonged high-intensity impact damage, and extending the equipment's lifespan. The lower half of the first discharge pipe 6 is a straight pipe. This design ensures smooth slurry flow into the circulating slurry tank 3 because the fluid resistance within a straight pipe is relatively low, improving slurry circulation efficiency. With the bottom ends of the two liquid outlets on the same horizontal plane, this design ensures that the slurry flow on both sides is more uniform. No matter how different the flue gas conditions are handled by the first sub-tower 1 and the second sub-tower 2, the final circulating liquid can be uniformly mixed in the circulating slurry pool 3, ensuring the stability of the circulating liquid properties and thus improving the overall performance and stability of the system.

[0028] Work process.

[0029] Before the twin exhaust gas scrubbing towers begin operation, the entire system must be inspected and prepared. Check that the slurry level in the circulating slurry tank 3 meets the requirements to ensure sufficient slurry for scrubbing. Simultaneously, check the status of key equipment such as the first induced draft fan 8, the second induced draft fan 9, the circulating pump 5, and the siphon tank 10 to ensure they are all in normal, operational condition.

[0030] After the system starts, the flue gas from both the left and right sides enters the scrubbing towers. The flue gas from the left side, driven by the first induced draft fan 8, enters the first sub-tower 1 through the first inlet, while the flue gas from the right side, driven by the second induced draft fan 9, enters the second sub-tower 2 through the second inlet. The flue gas entering the sub-towers begins to flow upwards. Simultaneously, the slurry in the circulating slurry tank 3, driven by the circulating pump 5, is lifted to the various spray layers 4 of the first and second sub-towers through the siphon effect of the siphon tank 10. Inside the first and second sub-towers, the multi-layered spray layers 4 begin to operate, with the slurry sprayed from the nozzles, making full contact with the rising flue gas. During this process, the effective components in the slurry chemically react with the pollutants in the flue gas, absorbing, neutralizing, or precipitating the pollutants, thus achieving the scrubbing process. For example, for flue gas containing sulfur dioxide, the alkaline substances in the slurry will neutralize the sulfur dioxide, converting it into harmless salts, thereby reducing the acidity and pollutant content of the flue gas.

[0031] After being washed by multiple spray layers 4, the washed flue gas continues to flow upward and is discharged from the first outlet of the first sub-tower 1 and the second outlet of the second sub-tower 2. The flue gas from the first outlet and the second outlet eventually merges at the top and connects to the desulfurization tower.

[0032] After washing, the slurry flows back to the circulating slurry tank 3 under gravity through the first drain pipe 6 and the second drain pipe 7. The S-shaped bend in the first drain pipe 6 guides the slurry to flow down at a suitable speed and in a suitable manner, avoiding blockage and impact on the circulating slurry tank 3. The straight section of the second drain pipe 7 also ensures smooth slurry return. Once the slurry flows back to the circulating slurry tank 3, it undergoes mixing and recirculation to continue providing resources for the next washing process.

[0033] 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 utility model.

Claims

1. A twin-stage tail gas scrubbing tower, characterized in that, It includes a first sub-tower and a second sub-tower arranged side by side. The first sub-tower has a first air inlet at the bottom of its back side, and the second sub-tower has a second air inlet at the bottom of its back side. The first sub-tower is located at the bottom of the first sub-tower near the second sub-tower, and the second sub-tower is located at the bottom of the second sub-tower near the first sub-tower. The first liquid discharge pipe is a curved pipe, and the second liquid discharge pipe is a straight pipe. Both of them extend into the circulating slurry pool below.

2. The twin tail gas scrubbing tower according to claim 1, characterized in that, The first air inlet is connected to the first induced draft fan, and the second air inlet is connected to the second induced draft fan.

3. A twin tail gas scrubbing tower according to claim 1, characterized in that, The first sub-tower has a first air outlet at its top, and the second sub-tower has a second air outlet at its top.

4. A twin tail gas scrubbing tower according to claim 3, characterized in that, The first and second air outlets are connected at the top to the desulfurization tower.

5. A twin tail gas scrubbing tower according to claim 1 or 3, characterized in that, The first and second sub-towers are equipped with several spray layers.

6. A twin tail gas scrubbing tower according to claim 5, characterized in that, The first and second sub-towers are connected above the air inlet via several circulating pumps and a circulating slurry pool.

7. A twin tail gas scrubbing tower according to claim 6, characterized in that, The circulating pump connects to the siphon tank and the circulating slurry pool.

8. A twin tail gas scrubbing tower according to claim 7, characterized in that, The siphon tank is equipped with a vent valve on the side near the circulating slurry tank.

9. A twin tail gas scrubbing tower according to claim 1, characterized in that, The upper part of the first liquid discharge pipe is an S-shaped bend that bends toward the second liquid discharge pipe.

10. A twin tail gas scrubbing tower according to claim 1 or 9, characterized in that, The lower half of the first liquid discharge tube is a straight tube, and the bottom end of the second liquid discharge tube is on the same horizontal plane.

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