Flue gas purification system of desulfurization tower

Abstract

The utility model relates to a flue gas purification system of a desulfurizing tower, which relates to the field of flue gas treatment and comprises a flue gas branch, a flue gas main path, a confluence component and the desulfurizing tower, each flue gas branch comprises a purification unit, an induced draft fan and a branch pipe, and a plurality of flue gas branches are arranged; an air inlet of the induced draft fan communicates with the purification unit, an air outlet of the induced draft fan communicates with an inlet of the branch pipe, and an outlet of the branch pipe communicates with an inlet of the confluence assembly; the outlet of the confluence assembly is communicated with the flue gas main path, and the flue gas main path is communicated with the desulfurization tower. According to the utility model, the flue gas in the plurality of flue gas branches is converged in the flue gas main path through the converging assembly, and the flue gas in the plurality of purification units is uniformly discharged into one desulfurization tower for desulfurization treatment through the flue gas main path, so that the number of desulfurization towers can be reduced, and the cost is saved; meanwhile, the flue gas in the plurality of purification units is discharged into one desulfurization tower for desulfurization treatment, so that the desulfurization efficiency of the desulfurization tower can be improved.

Description

Technical Field

[0001] This utility model relates to the field of flue gas treatment, and in particular to a flue gas purification system for a desulfurization tower. Background Technology

[0002] Electrolytic aluminum flue gas purification systems are of great significance for reducing electrolytic production costs and protecting the ecological environment. During production and operation, on the one hand, it is necessary to continuously improve the flue gas purification and recovery efficiency and reduce the concentration of dust and fluorides in the exhaust gas; on the other hand, it is necessary to continuously improve the system operation mode, tap the potential of existing equipment, improve gas collection efficiency, reduce the power consumption of purification fans, reduce production and operation costs, and achieve energy-saving and efficient operation of the system.

[0003] Currently, there are two traditional desulfurization methods for electrolytic aluminum. The first method is that each electrolysis workshop is divided into three purification units, and each purification unit has a corresponding induced draft fan and desulfurization tower for flue gas treatment. The second method is that the first and third purification units do not have desulfurization towers, but the second purification unit has a desulfurization tower. The three purification units are connected by a flue, and a booster fan is installed at the inlet of the desulfurization tower. The electrolytic flue gas is drawn in and pressurized by the induced draft fan before entering the desulfurization tower.

[0004] Regarding the two solutions mentioned above, the first method involves setting up multiple desulfurization towers, which not only increases costs but also results in low processing efficiency as each desulfurization tower only treats one purification unit. Although the second method reduces the number of desulfurization tower facilities, it requires the installation of booster fans in the pipeline process, which consumes a lot of electricity and incurs high equipment and maintenance costs. Utility Model Content

[0005] In order to improve the efficiency of desulfurization treatment of flue gas in electrolytic aluminum and save on operating and maintenance costs, this utility model provides a desulfurization tower flue gas purification system.

[0006] This utility model provides a flue gas purification system for a desulfurization tower, which adopts the following technical solution:

[0007] A flue gas purification system for a desulfurization tower includes: a flue gas branch, a main flue gas path, a manifold assembly, and a desulfurization tower; the flue gas branch includes a purification unit, an induced draft fan, and branch pipes, and multiple flue gas branches are provided; the inlet of the induced draft fan is connected to the purification unit, the outlet of the induced draft fan is connected to the inlet of the branch pipe, and the outlet of the branch pipe is connected to the inlet of the manifold assembly; the outlet of the manifold assembly is connected to the main flue gas path, and the main flue gas path is connected to the desulfurization tower.

[0008] By adopting the above technical solution, the purification unit on each branch will remove dust from the flue gas in the workshop, and blow the dust-removed flue gas into the branch pipe through the induced draft fan. Then, the flue gas in the branch pipe will be blown into the main flue gas path through the manifold assembly, and finally the flue gas discharged from the purification unit will be blown into the desulfurization tower for desulfurization treatment through the main flue gas path.

[0009] In this way, the converging component can gather flue gas from multiple flue gas branches into a single main flue gas path, and then discharge the flue gas from multiple purification units into a single desulfurization tower for desulfurization treatment through the main flue gas path, thereby reducing the number of desulfurization towers and saving costs; and discharging the flue gas from multiple purification units into a single desulfurization tower for desulfurization treatment improves the desulfurization efficiency of the desulfurization tower; at the same time, converging the flue gas from multiple flue gas branches into a single main flue gas path and then blowing it into the desulfurization tower in a unified manner can mix the flue gas from multiple flue gas branches, thereby reducing the impact of flue gas fluctuations in a single flue gas branch on the desulfurization efficiency.

[0010] Optionally, the manifold assembly includes a housing and multiple flue gas check valves. The housing is provided with multiple flue gas inlets and one flue gas outlet. The flue gas check valves are installed on the flue gas inlets one by one. The flue gas inlets are connected to the branch pipes, and the flue gas outlets are connected to the main flue gas path.

[0011] When multiple flue gas branches are connected to a main flue gas path via a converging assembly, the flow rate of flue gas in each branch differs. This can lead to flue gas flowing from branches with higher flow rates to branches with lower flow rates, increasing the probability of backflow. By employing the aforementioned technical solution, a flue gas check valve is installed at the inlet of the converging assembly. This ensures that flue gas can only flow from the flue gas branches to the converging assembly, thereby reducing the probability of flue gas flowing from the converging assembly back into the branches and thus mitigating the risk of backflow.

[0012] Optionally, a baffle plate is provided inside the housing to guide the flue gas from the inlet to the outlet.

[0013] When flue gas flows through a duct, the flow impacts the pipe, especially at high flow rates. The continuous impact at bends, such as pipe joints and junctions, can cause vibrations, leading to loose connections and potential leaks. By installing a baffle plate inside the manifold housing, the flue gas is guided from the inlet to the outlet, effectively reducing the impact at bends. This baffle plate minimizes the impact of the flowing flue gas on the housing's interior, reducing vibration and lowering the risk of leaks due to loose connections between the flue gas branches / main lines and the housing.

[0014] Optionally, the deflector can be detachably installed inside the housing.

[0015] As flue gas flows inside the enclosure, it continuously impacts the baffle plate, causing wear and deformation. Over time, this affects the baffle plate's guiding effect. By adopting the above-mentioned technical solution, the baffle plate is detachably installed inside the enclosure. When the baffle plate wears or deforms, it can be removed and replaced without replacing the entire manifold, reducing maintenance costs. Furthermore, when cleaning the inside of the enclosure, the baffle plate can be removed for separate cleaning of both the baffle plate and the inner wall of the enclosure, improving the cleanliness of the interior.

[0016] Optionally, the manifold assembly further includes an external fan and a one-way valve. The air outlet of the external fan is connected to the interior of the housing, and the air outlet of the external fan is positioned facing the smoke outlet of the housing. The one-way valve is installed at the air inlet of the external fan.

[0017] Since the duct size of the main flue gas path is constant, when one of the multiple flue gas branches stops operating, the flue gas flow rate in the main flue gas path decreases, leading to a drop in pressure and a slowdown in flue gas velocity, thus affecting the efficiency of flue gas desulfurization. By adopting the above technical solution, when the flue gas flow rate in the main flue gas path is slow, an external fan can be used to blow air from the external environment into the main flue gas path, accelerating the flue gas velocity and improving the filtration efficiency. Simultaneously, the external fan can regulate the internal pressure of the main flue gas path while blowing air into it, thus maintaining pressure balance. The one-way valve isolates the external fan from the manifold housing when the external fan stops operating, reducing the probability of flue gas leaking from the fan location into the external environment.

[0018] Optionally, it also includes multiple bypass pipes and reversing valves, wherein the smoke inlet of the bypass pipe is used to connect to the branch pipe, multiple smoke inlets of the reversing valve are respectively connected to the smoke outlets of the multiple bypass pipes, and the smoke outlet of the reversing valve is connected to the air inlet of the external fan.

[0019] When the fan in one of the multiple flue gas branches fails, the corresponding flue gas branch will cease operation, leading to its malfunction. By employing the above-mentioned technical solution, when the induced draft fan in a flue gas branch fails, a bypass pipe is connected to the branch pipe in the corresponding flue gas branch, and the switching valve is activated to connect the branch pipe to the interior of the enclosure. At this point, starting the external fan will blow the flue gas from the branch pipe into the enclosure and collect it into the main flue gas pipe. Thus, the bypass pipe and external fan work together to act as a backup pipe, providing a contingency plan to blow the flue gas from the malfunctioning branch pipe into the main flue gas pipe when it fails, thereby improving the reliability of the flue gas purification system.

[0020] Optionally, the housing is provided with a dust removal window, and the bottom of the housing is provided with a dust discharge port.

[0021] Because the purification unit has limited filtration capacity for dust in flue gas, and dust rubs and collides with the interior of the chamber as the flue gas flows, it can cause flue gas to accumulate inside, affecting flow efficiency and increasing the probability of blockage. By adopting the above-mentioned technical solution, opening the internal cleaning window allows for cleaning of the chamber's interior, and the cleaned dust is discharged from the ash outlet at the bottom of the chamber, facilitating timely removal of accumulated dust and reducing the risk of blockage.

[0022] Optionally, the corners inside the housing are all arc-shaped.

[0023] By adopting the above technical solution, the arc-shaped corner can play a guiding role. When the flue gas flows to the corner, it will change its flow direction along the arc-shaped corner, reducing the impact of the flue gas on the corner. At the same time, it can also reduce local turbulence, thereby reducing the impact on the flow direction of the flue gas.

[0024] In summary, this utility model has at least one of the following beneficial technical effects:

[0025] By using a converging component, flue gas from multiple flue gas branches can be gathered into a main flue gas path, and the flue gas from multiple purification units can be discharged into a desulfurization tower for desulfurization treatment through the main flue gas path, thereby reducing the number of desulfurization towers and saving costs.

[0026] Discharging flue gas from multiple purification units into a single desulfurization tower for desulfurization treatment can also improve the desulfurization efficiency of the tower.

[0027] By converging the flue gas from multiple flue gas branches into a single flue gas main pipe and then blowing it into the desulfurization tower, the flue gas from multiple flue gas branches can be mixed, thereby reducing the impact of flue gas fluctuations in a single flue gas branch on the desulfurization efficiency. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the purification system piping according to an embodiment of this application;

[0029] Figure 2 This is a schematic diagram of the overall structure of the bus component according to an embodiment of this application;

[0030] Figure 3 This is the internal structure of the bus component in an embodiment of this application.

[0031] Explanation of reference numerals in the attached diagram: 100, flue gas branch; 110, purification unit; 120, induced draft fan; 130, branch pipe; 200, main flue gas path; 300, desulfurization tower; 400, manifold assembly; 410, housing; 411, flue gas inlet; 412, flue gas outlet; 413, ash removal window; 414, ash discharge port; 420, flue gas check valve; 430, baffle plate; 440, external fan; 450, one-way valve; 500, bypass pipe; 510, reversing valve. Detailed Implementation

[0032] The following combination Figures 1 to 3 The present invention will be described in further detail below.

[0033] This utility model discloses a flue gas purification system for a desulfurization tower 300. (Refer to...) Figure 1 A flue gas purification system for a desulfurization tower 300 mainly includes a flue gas branch 100, a manifold assembly 400, a main flue gas path 200, and a desulfurization tower 300. The flue gas branch 100 includes a purification unit 110, an induced draft fan 120, and a branch pipe 130. The purification unit 110 is installed in the electrolytic aluminum production workshop. The inlet of the induced draft fan 120 is connected to the purification unit 110, and the outlet of the induced draft fan 120 is connected to the branch pipe 130. The flue gas generated in the electrolytic aluminum production workshop... After the flue gas passes through the purification unit 110 for dust removal, the induced draft fan 120 blows the flue gas discharged from the purification unit 110 into the branch pipe 130 and transports it backward. The branch pipe 130 is connected to the main flue gas pipe through the manifold 400. The end of the main flue gas pipe is connected to the desulfurization tower 300. The flue gas in the branch pipe 130 flows into the desulfurization tower 300 for desulfurization treatment along the manifold 400 and the main flue gas pipe 200. After the desulfurization is completed, it is discharged from the top of the desulfurization tower 300.

[0034] Reference Figure 1In this implementation, each workshop is equipped with three flue gas branches 100, and each flue gas branch 100 includes a purification unit 110, an induced draft fan 120, and a branch pipe 130. The purification unit 110 is used to collect the flue gas emitted from the workshop and to remove dust from the flue gas. The induced draft fan 120 connects the flue gas after dust removal by the purification unit 110 to the manifold assembly 400 through the branch pipe 130, and the manifold assembly 400 connects the branch pipes 130 of the three flue gas branches 100 to the main flue gas path 200 at the same time. The flue gas from the three flue gas branches 100 is then uniformly transported to the desulfurization tower 300 for desulfurization treatment through the main flue gas path 200.

[0035] Reference Figure 2 and Figure 3 The manifold assembly 400 includes a housing 410, a flue check valve 420 mounted on the housing 410, a baffle plate 430 disposed inside the housing 410, an external fan 440, and a one-way valve 450. The housing 410 is a square structure supported by welded aluminum plates. In this embodiment, the housing 410 has four smoke inlets 411 and one smoke outlet 412. Three of the smoke inlets 411 are used to connect to the branch pipes 130 on the three flue gas branch lines 100. The external fan 440 and the one-way valve 450 are installed at the remaining smoke inlet 411. The smoke outlet 412 is used to connect to the exhaust pipe of the main flue gas line 200. Specifically, the flue gas branch line 10... Branch pipe 130 in section 0 is connected to the smoke inlet 411 of housing 410 via a flange plate. Three flue check valves 420 are provided, which are respectively installed at the three smoke inlets 411 used to connect branch pipe 130. When flue gas flows from branch pipe 130 into housing 410, flue check valve 420 opens; when flue gas flows from inside housing 410 into branch pipe 130, flue check valve 420 closes. When external fan 440 is working, check valve 450 opens, and external air flows into housing 410 from check valve 450. When external fan 440 is turned off, the pressure inside housing 410 is higher than that of the external environment, and check valve 450 closes at this time.

[0036] Reference Figure 3 The top of the housing 410 is provided with a dust removal window 413, and a sealing plate is provided on the dust removal window 413. The sealing plate is fixed on the housing 410 by screws. The bottom of the housing 410 is provided with a dust discharge port 414, and another sealing plate is provided at the position of the dust discharge port 414. The other sealing plate is also fixed on the housing 410 by screws.

[0037] Reference Figure 3The guide plate 430 is located inside the housing 410, and the corners of both the guide plate 430 and the housing 410 are arc-shaped. The bottom of the housing 410 and the sealing plate at the top of the housing 410 have raised structures with the same shape as the guide plate. A groove is located in the center of the raised structure, and rubber material is attached to the sidewall of the groove. When installing the guide plate 430, the bottom of the guide plate 430 is engaged in the groove of the raised structure at the bottom of the housing 410. Then, the groove on the sealing plate at the position of the dust removal window 413 is aligned with the top of the guide plate 430, and the sealing plate is fixedly installed on the dust removal window 413, thus completing the fixation of the guide plate 430. During dust removal, the sealing plates on the dust removal window 413 and the ash discharge port 414 are removed, and the guide plate 430 is taken out for cleaning. When cleaning the dust adhering to the inner wall of the housing 410, the dust inside the housing 410 can be discharged through the ash discharge port 414.

[0038] Reference Figure 1 The manifold assembly 400 is also connected to a reversing valve 510 and a bypass pipe 500. The reversing valve 510 has three inlets and one outlet. The inlets of the reversing valve 510 are connected to the smoke inlet 411 of the external fan 440 in the manifold assembly 400. The bypass pipe 500 has three sets, which are respectively connected to the branch pipes 130 of the three flue gas branches 100. Each of the three inlet positions of the reversing valve 510 is equipped with a valve plate. When one of them... When the induced draft fan 120 in a flue gas branch 100 stops working, the valve plate at the inlet position of the reversing valve 510 connected to the branch pipe 130 of the flue gas branch 100 is opened, and the external fan 440 is controlled to start working. The external fan 440 can blow the flue gas in the flue gas branch 100 into the manifold assembly 400. When the induced draft fan 120 in the flue gas branch 100 is damaged, the external fan 440 can be used as an alternative to improve the reliability of the flue gas purification system.

[0039] The implementation principle of a 300 desulfurization tower flue gas purification system according to this utility model embodiment is as follows:

[0040] Each electrolytic aluminum production workshop is equipped with three flue gas branches 100. Each flue gas branch 100 includes a purification unit 110, an induced draft fan 120, and a branch pipe 130. The purification unit 110 is used to collect the flue gas emitted from the workshop and perform preliminary purification and dust removal treatment on the flue gas. The induced draft fan 120 connects the flue gas after dust removal by the purification unit 110 to the manifold assembly 400 through the branch pipe 130. The manifold assembly 400 connects the branch pipes 130 of the three flue gas branches 100 to the main flue gas path 200. The main flue gas path 200 then uniformly transports the flue gas from the three flue gas branches 100 to the desulfurization tower 300 for desulfurization treatment. When the flue gas flows in the housing 410 of the manifold assembly 400, the flue gas check valve 42... 0. Flue gas is only allowed to flow into the housing 410 from the branch pipe 130, and the guide plate 430 inside the housing 410 can guide the flue gas flowing into the housing 410 from the inlet 411 to the outlet 412 of the housing 410, reducing the impact of flue gas on the inside of the housing 410. When the induced draft fan 120 in one of the flue gas branches 100 stops working, the valve plate at the inlet position of the reversing valve 510 connected to the branch pipe 130 of the flue gas branch 100 is opened, and the external fan 440 is controlled to start working. The external fan 440 can blow the flue gas in the flue gas branch 100 into the housing 410, which can improve the reliability of the flue gas purification system and maintain the stability of the internal pressure of the main flue, thereby improving the flue gas conveying and purification efficiency.

[0041] In summary, this application uses a converging component to gather flue gas from multiple flue gas branches 100 into a single main flue gas path 200. The main flue gas path 200 then discharges flue gas from multiple purification units 110 into a desulfurization tower 300 for desulfurization treatment, thereby reducing the number of desulfurization towers 300 and saving costs. Simultaneously, discharging flue gas from multiple purification units 110 into a single desulfurization tower 300 for desulfurization treatment also improves the desulfurization efficiency of the tower. Furthermore, converging flue gas from multiple flue gas branches 100 into a single main flue gas path allows for mixing of the flue gas from multiple branches 100, thus reducing the impact of flue gas fluctuations in a single branch 100 on desulfurization efficiency.

[0042] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made according to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A flue gas purification system for a desulfurization tower (300), characterized in that, include: Flue gas branch (100), flue gas main (200), manifold (400) and desulfurization tower (300); The flue gas branch (100) includes a purification unit (110), an induced draft fan (120), and a branch pipe (130), and multiple flue gas branches (100) are provided; The air inlet of the exhaust fan (120) is connected to the purification unit (110), the air outlet of the exhaust fan (120) is connected to the inlet of the branch pipe (130), and the outlet of the branch pipe (130) is connected to the inlet of the manifold assembly (400). The outlet of the manifold assembly (400) is connected to the flue gas main line (200), and the flue gas main line (200) is connected to the desulfurization tower (300).

2. The flue gas purification system for a desulfurization tower (300) according to claim 1, characterized in that: The manifold assembly (400) includes a housing (410) and multiple flue check valves (420). The housing (410) is provided with multiple smoke inlets (411) and one smoke outlet (412). The flue check valves (420) are installed one by one on the smoke inlets (411). The smoke inlets (411) are connected to the branch pipe (130), and the smoke outlet (412) is connected to the main flue gas path (200).

3. The flue gas purification system for a desulfurization tower (300) according to claim 2, characterized in that: The housing (410) is provided with a baffle plate (430), which is used to guide the flue gas from the inlet (411) to the outlet (412).

4. The flue gas purification system for a desulfurization tower (300) according to claim 3, characterized in that: The deflector plate (430) is detachably installed inside the housing (410).

5. The flue gas purification system for a desulfurization tower (300) according to claim 2, characterized in that: The manifold assembly (400) also includes an external fan (440) and a one-way valve (450). The air outlet of the external fan (440) is connected to the interior of the housing (410), and the air outlet of the external fan (440) is arranged facing the smoke outlet (412) of the housing (410). The one-way valve (450) is installed at the air inlet of the external fan (440).

6. The flue gas purification system for a desulfurization tower (300) according to claim 5, characterized in that: It also includes multiple bypass pipes (500) and a reversing valve (510). The smoke inlet (411) of the bypass pipe (500) is used to connect to the branch pipe (130). The multiple smoke inlets (411) of the reversing valve (510) are respectively connected to the smoke outlets (412) of the multiple bypass pipes (500). The smoke outlet (412) of the reversing valve (510) is connected to the air inlet of the external fan (440).

7. A flue gas purification system for a desulfurization tower (300) according to any one of claims 2-6, characterized in that: The box (410) is provided with a dust removal window (413) and the bottom of the box (410) is provided with a dust discharge port (414).

8. A flue gas purification system for a desulfurization tower (300) according to any one of claims 2-6, characterized in that: The corners inside the box (410) are all arc-shaped.

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