Multi-stage tail gas desulfurization device and working process thereof

Abstract

The invention belongs to the technical field of tail gas treatment, and particularly relates to a multi-stage tail gas desulfurization device which comprises a tail gas flow channel structure and a liquid flow channel structure. The tail gas flow channel structure enables tail gas to sequentially pass through the tail gas holes of the reaction chambers from bottom to top to flow through the reaction chambers; the liquid flow channel structure enables the reaction liquid to enter the rotors for acceleration, and the liquid flow channel structure also enables the redundant reaction liquid deposited at the bottom of the reaction chamber in each reaction chamber to enter the rotor in the next layer of reaction chamber for acceleration; the tail gas flow channel structure and the liquid flow channel structure enable the tail gas flow direction and the reaction liquid flow direction in each reaction chamber to react in the reaction chamber in opposite directions, and a liquid blocking structure for preventing the reaction liquid in the reaction chamber from flowing into the next layer of reaction chamber through the tail gas hole is also arranged at the tail gas hole. The device can improve the reaction efficiency, enables tail gas desulfurization to be more thorough, can also improve the utilization rate of the reaction liquid, reduces the total usage amount of the reaction liquid, and is energy-saving and environment-friendly.

Description

Technical Field

[0001] The present invention belongs to the technical field of tail gas treatment, and particularly relates to a multi-stage tail gas desulfurization device and its working process. Background Art

[0002] The high gravity technology is an innovative technology for strengthening the gas-liquid mass transfer process. By using the high gravity environment, it can increase the specific surface area of gas-liquid contact and reduce the mass transfer resistance between gas and liquid, so as to achieve the purpose of improving the gas-liquid mass transfer rate and reducing the reactor volume. The main mechanism of the high gravity technology is that under the centrifugal acceleration hundreds to thousands of times higher than the earth's gravity field, the liquid will form tiny droplets, liquid films, and liquid filaments on the surface and pores of the filler and flow from the inner diameter to the outer diameter. On the one hand, it increases the specific surface area of gas-liquid contact, and on the other hand, it also improves the mass transfer coefficient due to the micro-mixing effect between gas and liquid. Generally speaking, compared with the traditional gas-liquid contact device, the mass transfer rate per unit volume of the high gravity reactor can be increased by dozens to hundreds of times, and the equipment volume of the reactor can be significantly reduced.

[0003] However, the traditional rotating packed bed reactors used are all single-layer rotating packed bed devices. Under the same superficial tail gas velocity and superficial liquid velocity, if we want to improve the gas-liquid mass transfer effect, usually we can only increase the size of the rotating packed bed. However, an overly large rotating radius will cause mechanical burdens on the spindle and bearings and is prone to damage. Therefore, the application of the single-layer rotating packed bed device is restricted. If a multi-layer countercurrent rotating packed bed can be developed, the gas-liquid mass transfer area can be significantly increased, thereby improving the mass transfer efficiency.

[0004] For example, in a multi-layer countercurrent rotating packed bed with the patent number CN104436736A, the tail gas enters the packed bed from the bottom, and the liquid enters the packed bed from the top and collides with the tail gas through multiple reaction chambers. This method can improve the mass transfer efficiency. However, since the flow directions of the tail gas and the liquid in the reaction chamber are the same, the intensity of the collision between the tail gas and the liquid still needs to be improved. Summary of the Invention

[0005] The object of the present invention is to solve the above-mentioned existing technical problems by providing a multi-stage tail gas desulfurization device and its working process, achieving the effects that the flow directions of the tail gas and the liquid in each reaction chamber are opposite, so that the liquid thrown out at high speed and the tail gas will collide violently in the reaction chamber, and the reaction liquid enters the next layer of the reaction chamber through the liquid flow channel structure and is re-accelerated by the rotor to continue desulfurizing the tail gas, improving the reaction efficiency, making the tail gas desulfurization more thorough, reducing the overall usage amount of the reaction liquid, and saving energy and protecting the environment.

[0006] In view of this, the present invention provides a multi-stage tail gas desulfurization device, including:

[0007] A sealed housing, which includes a liquid discharge port, a tail gas inlet, and a tail gas outlet;

[0008] Reaction chambers, there are at least three reaction chambers, and multiple reaction chambers are arranged in the sealed housing along the axis of the central axis. A rotor is arranged in each reaction chamber;

[0009] A tail gas flow channel structure, the two ends of the tail gas flow channel structure are respectively the tail gas inlet and the tail gas outlet, and the tail gas flow channel structure enables the tail gas to flow through each reaction chamber in sequence from bottom to top through the tail gas holes of each reaction chamber;

[0010] A liquid flow channel structure, the liquid flow channel structure accelerates the reaction liquid to enter the rotor, and the liquid flow channel structure can also accelerate the reaction liquid that is excessively deposited at the bottom of each reaction chamber into the rotor in the next layer of reaction chamber;

[0011] Among them, the tail gas flow channel structure and the liquid flow channel structure enable the tail gas flow direction and the reaction liquid flow direction in each reaction chamber to react in the reaction chamber in the opposite direction. A liquid blocking structure is also arranged at the tail gas hole to prevent the reaction liquid in the reaction chamber from flowing into the next layer of reaction chamber through the tail gas hole.

[0012] In this technical solution, by making the tail gas flow direction and the liquid flow direction in each reaction chamber opposite, that is, the tail gas flows clockwise and the liquid flows counterclockwise, or the tail gas flows counterclockwise and the liquid flows clockwise. In this way, the liquid and the tail gas that are thrown out at high speed will collide violently in the reaction chamber, which can improve the reaction efficiency and make the tail gas desulfurization more thorough; through the setting of the liquid blocking structure, the reaction liquid can enter the next layer of reaction chamber through the liquid flow channel structure and be re-accelerated by the rotor to continue desulfurizing the tail gas, preventing the reaction liquid from flowing into the next reaction chamber through the tail gas hole. Because it is not re-accelerated by the rotor, it lacks high-speed movement and cannot react with the tail gas for desulfurization. In this way, the utilization rate of the reaction liquid is improved, the total usage amount of the reaction liquid is reduced, and energy is saved and the environment is protected.

[0013] Further, the tail gas flow channel structure includes:

[0014] Tail gas holes, the upper top plate and the lower bottom plate of each reaction chamber are both provided with the tail gas holes, and the two tail gas holes are staggered from each other;

[0015] Baffles, the baffles are fixedly arranged between the upper top plate and the lower bottom plate of each reaction chamber. The upper and lower ends of the baffles are fixedly connected to the upper top plate and the lower bottom plate, and the left and right ends respectively extend to the inner wall of the reaction chamber and the outside of the rotor. The baffles are arranged on one side of the tail gas holes for guiding the tail gas;

[0016] Among them, the tail gas holes on the upper top plate and the lower bottom plate of the reaction chamber are respectively arranged on both sides of the baffle.

[0017] In this technical solution, through the setting of the baffle plate, the tail gas can only flow around the inner cavity of the reaction chamber away from the baffle plate after entering the reaction chamber through the tail gas holes on the lower bottom plate. The tail gas holes on the upper top plate are staggered from the tail gas holes on the upper top plate and are respectively arranged on both sides of the baffle plate. In this way, the tail gas can only be discharged into the upper-layer reaction chamber through the tail gas holes on the upper top plate after flowing around the reaction chamber once, which improves the residence time of the tail gas in the reaction chamber, increases the reaction time, and improves the reaction conversion rate.

[0018] Further, the liquid blocking structure includes:

[0019] A vertical pipe, which is communicated with the tail gas holes on the lower bottom plate and extends vertically towards the inside of the reaction chamber perpendicular to the lower bottom plate;

[0020] A horizontal pipe, which is parallel to the lower bottom plate of the reaction chamber. The middle part of the horizontal pipe is bent downward to form an arc-shaped liquid accumulation bay. A liquid discharge hole is opened at the bottom of the liquid accumulation bay, and the liquid in the liquid accumulation bay can be discharged into the reaction chamber through the liquid discharge hole;

[0021] Wherein, one end of the horizontal pipe is connected to the other end of the vertical pipe far away from the lower bottom plate, the other end of the horizontal pipe faces the rotor, and the vertical pipe and the inside of the vertical pipe are hollow and communicated to form an intake channel.

[0022] In this technical solution, the tail gas enters the vertical pipe upward through the tail gas holes, discharges towards the rotor through the horizontal pipe and the liquid accumulation bay, and the reaction liquid accelerated by the rotor is thrown out and hits the tail gas discharged from the horizontal pipe for reaction. Part of the reaction liquid thrown into the horizontal pipe enters the horizontal pipe and will accumulate in the liquid accumulation bay and be discharged through the liquid discharge hole and will not enter the vertical pipe. In this way, it can prevent the reaction liquid from entering the lower-layer reaction chamber through the tail gas holes, and the reaction liquid thrown into the horizontal pipe will repeatedly hit the inner wall of the horizontal pipe and also hit the tail gas in the horizontal pipe to desulfurize the tail gas, and can pre-desulfurize the tail gas and improve the reaction rate.

[0023] Further, the liquid flow channel structure includes:

[0024] A liquid-phase inlet pipe, which is used to guide the reaction liquid to the rotor;

[0025] Liquid discharge holes, which are opened on the upper top plate and the lower bottom plate of each reaction chamber.

[0026] In this technical solution, the reaction liquid enters the rotor from the liquid-phase inlet pipe and is thrown out after being accelerated by the rotor. The thrown reaction liquid reacts with the tail gas. The excess reaction liquid falls onto the lower bottom plate of the reaction chamber due to gravity and flows into the lower-layer reaction chamber from the liquid discharge holes on the lower bottom plate. In this way, the excess reaction liquid of each layer flows into the lower-layer reaction chamber in turn and is finally discharged from the liquid discharge port. In this way, the unreacted excess reaction liquid can be utilized, the reaction liquid can be used in multiple stages, the liquid consumption can be reduced, waste can be reduced, and energy can be saved.

[0027] Furthermore, each reaction chamber corresponds to a liquid phase inlet pipe, one end of which extends to the outside of the closed shell and is connected to the liquid storage tank, and the other end extends into the rotor of the corresponding reaction chamber.

[0028] Furthermore, the liquid phase inlet pipe corresponding to the reaction chamber located between the uppermost reaction chamber and the lowermost reaction chamber is provided with a branch at the liquid outlet of the upper top plate, and the branch is connected to the liquid outlet to receive the excess reaction liquid discharged from the liquid outlet and guide it into the rotor.

[0029] In the present technical solution, each reaction chamber corresponds to a different liquid phase inlet pipe, which can independently add liquid to each reaction chamber, and the liquid phase inlet pipe corresponding to the reaction chamber of the middle layer is also provided with a branch connected to the liquid outlet, which can receive the reaction liquid discharged from the liquid outlet and guide the reaction liquid to the rotor of the next layer of reaction chamber. In this way, the excess reaction liquid that has not been reacted can be utilized, so that the reaction liquid can be used in multiple stages, reducing the amount of liquid used, reducing waste and saving energy.

[0030] Furthermore, the lower bottom plate of each reaction chamber is inclined toward the liquid outlet.

[0031] In the technical solution, the lower bottom plate is inclined toward the liquid outlet, so that the excess reaction liquid can smoothly enter the next layer of reaction chamber, thereby preventing the excess reaction liquid from accumulating on the lower bottom plate and causing waste.

[0032] Furthermore, the inclination angle of the lower base plate is 1-2°.

[0033] Furthermore, the liquid discharge port is arranged at the bottom of the sealed shell, the exhaust gas inlet is arranged at the lower side of the sealed shell, and the exhaust gas discharge port is arranged at the bottom of the sealed shell.

[0034] Furthermore, the working process of the multi-stage tail gas desulfurization device includes the following steps:

[0035] Step S1: opening the tail gas inlet port, and the tail gas enters the closed housing from the tail gas inlet port;

[0036] Step S2: the tail gas is discharged from the tail gas holes on the bottom plate of the lowest layer of the reaction chamber to the rotor through the vertical pipe and the horizontal pipe of the liquid blocking structure in sequence, the tail gas is blocked by the baffle and flows in the direction away from the baffle, and finally flows from the tail gas holes on the top plate of the reaction chamber on the other side of the baffle to the reaction chamber of the upper layer;

[0037] Step S3: opening the liquid phase inlet tube, and allowing the reaction liquid to enter the rotor of each reaction chamber from the liquid phase inlet tube;

[0038] Step S4: The rotor accelerates the reaction liquid and throws it out to collide with the tail gas in the reaction chamber. Part of the reaction liquid is thrown to the horizontal pipe, accumulated in the liquid accumulation bay and discharged from the drain hole without entering the vertical pipe;

[0039] Step S5: After a preset time, open the tail gas outlet to discharge the desulfurized tail gas from the tail gas outlet, and open the liquid outlet.

[0040] Step S6: The excess reaction liquid in Steps S3 and S4 falls onto the lower bottom plate of the reaction chamber due to gravity, flows through the branch of the liquid inlet pipe from the liquid outlet hole of the lower bottom plate to the rotor of the next layer of the reaction chamber, and then repeats the steps in Step S4. Finally, the excess reaction liquid is discharged outside the sealed housing through the liquid outlet.

[0041] Step S7: Repeat Steps S2, S4, and S6 until all the tail gas is desulfurized, and then close the tail gas inlet, the liquid inlet pipe, and the liquid outlet.

[0042] The beneficial effects of the present invention are as follows:

[0043] 1. By making the flow direction of the tail gas and the liquid flow direction in each reaction chamber opposite, that is, the tail gas flows clockwise and the liquid flows counterclockwise, or the tail gas flows counterclockwise and the liquid flows clockwise, the liquid and the tail gas thrown out at high speed will collide violently in the reaction chamber, which can improve the reaction efficiency and make the tail gas desulfurization more complete; through the setting of the liquid blocking structure, the reaction liquid can enter the next layer of the reaction chamber from the liquid flow channel structure and be re-accelerated by the rotor to continue desulfurizing the tail gas, preventing the reaction liquid from flowing into the next reaction chamber through the tail gas hole. Without being re-accelerated by the rotor, it lacks high-speed movement and cannot react with the tail gas for desulfurization. In this way, the utilization rate of the reaction liquid is improved, the total usage amount of the reaction liquid is reduced, and energy conservation and environmental protection are achieved.

[0044] 2. Through the setting of the baffle, the tail gas can only flow around the inner cavity of the reaction chamber away from the baffle after entering the reaction chamber through the tail gas hole on the lower bottom plate, and the tail gas holes on the upper top plate are staggered with the tail gas holes on the upper top plate and are respectively arranged on both sides of the baffle. In this way, the tail gas can only be discharged from the tail gas hole on the upper top plate and enter the upper layer of the reaction chamber after flowing around the reaction chamber once, which improves the residence time of the tail gas in the reaction chamber, increases the reaction time, and improves the reaction conversion rate.

[0045] 3. The tail gas enters the vertical pipe upward through the tail gas hole, discharges towards the rotor through the horizontal pipe and the liquid accumulation bay. After being accelerated by the rotor, the reaction liquid is thrown out and hits the tail gas discharged from the horizontal pipe for reaction. Part of the reaction liquid thrown into the horizontal pipe enters the horizontal pipe and will accumulate in the liquid accumulation bay and be discharged from the drain hole without entering the vertical pipe. In this way, it can prevent the reaction liquid from entering the next layer of the reaction chamber through the tail gas hole, and the reaction liquid thrown into the horizontal pipe will repeatedly collide with the inner wall of the horizontal pipe and also collide with the tail gas in the horizontal pipe to desulfurize the tail gas, which can pre-desulfurize the tail gas and improve the reaction rate.

[0046] 4. The reaction liquid enters the rotor from the liquid-phase inlet pipe, is accelerated by the rotor and then thrown out. After being thrown out, the reaction liquid reacts with the tail gas. The excess reaction liquid, due to gravity, falls onto the lower bottom plate of the reaction chamber and flows out through the liquid outlet hole on the lower bottom plate into the next-layer reaction chamber. In this way, the excess reaction liquid on each layer flows into the next-layer reaction chamber in sequence and finally is discharged from the liquid discharge port. This can utilize the unreacted excess reaction liquid, enabling the reaction liquid to be used in multiple stages, reducing the liquid usage, reducing waste and saving energy.

[0047] 5. Each reaction chamber corresponding to a different liquid-phase inlet pipe can independently add liquid to each reaction chamber. Moreover, the liquid-phase inlet pipe corresponding to the reaction chamber in the middle layer is also provided with a branch connected to the liquid outlet hole, which can receive the reaction liquid discharged from the liquid outlet hole and direct the reaction liquid into the rotor of the next-layer reaction chamber. This can utilize the unreacted excess reaction liquid, enabling the reaction liquid to be used in multiple stages, reducing the liquid usage, reducing waste and saving energy.

[0048] 6. The lower bottom plates all incline towards the liquid outlet hole, which can enable the excess reaction liquid to smoothly enter the next-layer reaction chamber and prevent the excess reaction liquid from accumulating on the lower bottom plate and causing waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 is a cross-sectional view of the present invention;

[0050] Figure 2 is a top view of the interior of the present invention;

[0051] Figure 3 is the flow path of the tail gas and the reaction liquid;

[0052] Figure 4 is the partial enlarged view A;

[0053] Figure 5 is the schematic diagram of the liquid-blocking structure;

[0054] Figure 6 is the cross-sectional view of the liquid-blocking structure;

[0055] The markings in the figure are shown as:

[0056] 1. Sealed housing; 2. Mandrel; 3. Reaction chamber; 4. Liquid discharge port; 5. Tail gas inlet; 6. Tail gas outlet; 7. Rotor; 8. Tail gas hole; 9. Baffle; 10. Upper top plate; 11. Lower bottom plate; 12. Liquid-phase inlet pipe; 13. Liquid outlet hole; 14. Branch; 15. Vertical pipe; 16. Horizontal pipe; 17. Liquid accumulation bay; 18. Liquid-blocking structure; 19. Liquid discharge hole. DETAILED DESCRIPTION OF THE INVENTION

[0057] Next, the technical solutions in the embodiments of the present application will be clearly described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0058] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments of the present application. For the convenience of description, the sizes of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0059] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data may be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same category, and do not limit the number of objects. For example, the first object may be one or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally means an "or" relationship between the associated objects before and after.

[0060] It should be noted that in the description of the present application, the orientation or positional relationships indicated by the orientation terms such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present application and simplifying the description. Without contrary explanation, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present application; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0061] It should be noted that in this application, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or device comprising that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of this application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described method may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0062] Embodiment 1:

[0063] As Figure 1 shown, a multi-stage tail gas desulfurization device includes a sealed housing 1, a mandrel 2, reaction chambers 3, a tail gas flow channel structure, and a liquid flow channel structure. The sealed housing 1 includes a liquid discharge port 4, a tail gas inlet 5, and a tail gas discharge port 6; the liquid discharge port 4 is provided at the lowermost part of the sealed housing 1. The tail gas inlet 5 is provided at the lower side part of the sealed housing 1, and the tail gas discharge port 6 is provided at the lowermost part of the sealed housing 1. The mandrel 2 penetrates the sealed housing 1; there are at least three reaction chambers 3, and a plurality of reaction chambers 3 are arranged in the sealed housing 1 along the axial direction of the mandrel 2. A rotor 7 is provided in each reaction chamber 3, and the rotor 7 can rotate driven by the mandrel 2. The two ends of the tail gas flow channel structure are respectively the tail gas inlet 5 and the tail gas discharge port 6, and the tail gas flow channel structure enables the tail gas to sequentially pass through the tail gas holes 8 of each reaction chamber 3 from bottom to top and flow through each reaction chamber 3; the liquid flow channel structure enables the reaction liquid to enter the rotor 7 and be thrown out after being accelerated by the rotor 7 into the reaction chamber 3, and the liquid flow channel structure can also accelerate the reaction liquid that is excessively deposited at the bottom of each reaction chamber 3 and enters the rotor 7 in the next-layer reaction chamber 3.

[0064] The tail gas flow channel structure and the liquid flow channel structure enable the tail gas flow direction and the liquid flow direction in each reaction chamber 3 to react in the reaction chamber 3 in the opposite direction. By making the tail gas flow direction and the liquid flow direction in each reaction chamber 3 opposite, in this embodiment, the tail gas flows clockwise and the liquid flows counterclockwise. In this way, the liquid and the tail gas thrown out at high speed will collide violently in the reaction chamber 3, which can improve the reaction efficiency and make the tail gas desulfurization more thorough.

[0065] A liquid blocking structure 18 is also provided at the tail gas hole 8 to prevent the reaction liquid in the reaction chamber 3 from flowing into the lower layer of the reaction chamber 3 through the tail gas hole 8. By providing the liquid blocking structure 18, the reaction liquid can enter the lower layer of the reaction chamber 3 from the liquid flow channel structure, be re-accelerated by the rotor 7, and continue to desulfurize the tail gas. This prevents the reaction liquid from flowing into the next reaction chamber 3 through the tail gas hole 8, where it lacks high-speed movement due to not being re-accelerated by the rotor 7 and thus cannot react with the tail gas for desulfurization. In this way, the utilization rate of the reaction liquid is increased, the total usage amount of the reaction liquid is reduced, and energy conservation and environmental protection are achieved.

[0066] Embodiment 2:

[0067] As Figure 1-2 shown, the tail gas flow channel structure includes a tail gas hole 8 and a baffle 9. The tail gas holes 8 are provided on the upper top plate 10 and the lower bottom plate 11 of each reaction chamber 3, and the two tail gas holes 8 are staggered from each other; Figure 1 Among them, the 1-4th tail gas holes 8 are arranged from top to bottom in Figure 2 Among them, the 1-4th tail gas holes 8 are arranged counterclockwise in Figure 1 Among them, the 1-4th baffles 9 are arranged from top to bottom in Figure 2 Among them, the 1-4th baffles 9 are arranged counterclockwise in Figure 3 The tail gas holes 8 on the upper top plate 10 and the lower bottom plate 11 of the reaction chamber 3 are respectively arranged on both sides of the baffle 9. By providing the baffle 9, the tail gas can only flow around the inner cavity of the reaction chamber 3 away from the baffle 9 after entering the reaction chamber 3 through the tail gas hole 8 on the lower bottom plate 11, and the tail gas hole 8 on the upper top plate 10 is staggered from the tail gas hole 8 on the upper top plate 10 and is respectively arranged on both sides of the baffle 9. In this way, the tail gas can only be discharged from the tail gas hole 8 on the upper top plate 10 into the upper layer of the reaction chamber 3 after flowing around the reaction chamber 3 for one week. This increases the residence time of the tail gas in the reaction chamber 3, increases the reaction time, and improves the reaction conversion rate. The specific flow direction of the tail gas is shown in the line with a solid arrow in

[0068] As Figure 1 and 5As shown in FIG. -6, the liquid blocking structure 18 includes a vertical pipe 1515 and a horizontal pipe 16. The vertical pipe 1515 communicates with the tail gas hole 8 on the lower bottom plate 11 and extends perpendicularly to the lower bottom plate 11 into the reaction chamber 3; the horizontal pipe 16 is parallel to the lower bottom plate 11 of the reaction chamber 3, and the middle part of the horizontal pipe 16 bends downward to form an arc-shaped liquid accumulation bay 17. A liquid discharge hole 19 is provided at the bottom of the liquid accumulation bay 17, and the liquid in the liquid accumulation bay 17 can be discharged into the reaction chamber 3 through the liquid discharge hole 19; one end of the horizontal pipe 16 is connected to the other end of the vertical pipe 15 away from the lower bottom plate 11, the other end of the horizontal pipe 16 faces the rotor 7, and the inside of the vertical pipe 15 and the vertical pipe 15 is hollow and communicates to form an intake passage. The tail gas enters the vertical pipe 15 upward through the tail gas hole 8, is discharged toward the rotor 7 through the horizontal pipe 16 and the liquid accumulation bay 17, and the reaction liquid accelerated by the rotor 7 is thrown out and hits the tail gas discharged from the horizontal pipe 16 for reaction. Part of the reaction liquid thrown into the horizontal pipe 16 enters the horizontal pipe 16 and will accumulate in the liquid accumulation bay 17 and be discharged through the liquid discharge hole 19 without entering the vertical pipe 15. In this way, it can prevent the reaction liquid from entering the lower-layer reaction chamber 3 through the tail gas hole 8, and the reaction liquid thrown into the horizontal pipe 16 will repeatedly hit the inner wall of the horizontal pipe 16 and also hit the tail gas in the horizontal pipe 16 to desulfurize the tail gas, which can pre-desulfurize the tail gas and improve the reaction rate.

[0069] Embodiment 3:

[0070] As shown in Figure 1-2 FIG. 4, the liquid flow channel structure includes a liquid phase inlet pipe 12 and a liquid discharge hole 13. Each reaction chamber 3 corresponds to a liquid phase inlet pipe 12. One end of the liquid phase inlet pipe 12 extends outside the sealed housing 1 and is connected to a liquid storage tank, and the other end extends into the rotor 7 of the corresponding reaction chamber 3. The liquid phase inlet pipe 12 is used to guide the reaction liquid into the rotor 7. The liquid phase inlet pipe 12 corresponding to the reaction chamber 3 between the uppermost reaction chamber 3 and the lowermost reaction chamber 3 is provided with a branch 14 at the liquid discharge hole 13 of the upper top plate 10. The branch 14 is connected to the liquid discharge hole 13 and can receive the excess reaction liquid discharged from the liquid discharge hole 13 and guide it into the rotor 7.

[0071] The liquid discharge hole 13 is provided on both the upper top plate 10 and the lower bottom plate 11 of each reaction chamber 3. After the reaction liquid enters the rotor 7 from the liquid phase inlet pipe 12, it is thrown out after being accelerated by the rotor 7. The thrown-out reaction liquid reacts with the tail gas. The excess reaction liquid falls onto the lower bottom plate 11 of the reaction chamber 3 due to gravity and flows into the lower-layer reaction chamber 3 through the liquid discharge hole 13 on the lower bottom plate 11. In this way, the excess reaction liquid of each layer flows into the lower-layer reaction chamber 3 in sequence and is finally discharged from the liquid discharge port 4. In this way, the unreacted excess reaction liquid can be utilized, enabling the reaction liquid to be used in multiple stages, reducing the liquid consumption, reducing waste and saving energy. The specific flow direction of the reaction liquid is shown in the dotted line segment with an arrow in Figure 3 FIG.

[0072] Each reaction chamber 3 corresponds to a different liquid-phase inlet pipe 12 and can independently add liquid to each reaction chamber 3. Moreover, the liquid-phase inlet pipe 12 corresponding to the reaction chamber 3 in the middle layer is also provided with a branch 14 connected to the liquid outlet hole 13, which can receive the reaction liquid discharged from the liquid outlet hole 13 and direct the reaction liquid into the rotor 7 of the reaction chamber 3 in the next layer. In this way, the excess unreacted reaction liquid can be utilized, enabling the reaction liquid to be used in multiple stages, reducing the liquid consumption, reducing waste, and saving energy.

[0073] Example 4:

[0074] The lower bottom plate 11 of each reaction chamber 3 is inclined towards the liquid outlet hole 13, and the inclination angle is 1-2°. The lower bottom plate 11 being inclined towards the liquid outlet hole 13 can enable the excess reaction liquid to smoothly enter the reaction chamber 3 in the next layer, preventing the excess reaction liquid from accumulating on the lower bottom plate 11 and causing waste.

[0075] The specific working steps of the tail gas desulfurization device include:

[0076] Step S1: Open the tail gas inlet 5, and the tail gas enters the closed housing 1 from the tail gas inlet 5;

[0077] Step S2: The tail gas sequentially passes through the vertical pipe 15 and the horizontal pipe 16 of the liquid blocking structure 18 from the tail gas hole 8 on the lower bottom plate 11 of the reaction chamber 3 in the lowest layer and is discharged to the rotor 7. The tail gas is blocked by the baffle 9 and flows in a direction away from the baffle 9, and finally flows from the tail gas hole 8 on the other side of the baffle 9 on the upper top plate 10 of the reaction chamber 3 to the reaction chamber 3 in the upper layer;

[0078] Step S3: Open the liquid-phase inlet pipe 12, and the reaction liquid is introduced into the rotor 7 of each reaction chamber 3 from the liquid-phase inlet pipe 12;

[0079] Step S4: The rotor 7 accelerates the reaction liquid and then throws it out to collide with the tail gas in the reaction chamber 3. Part of the reaction liquid is thrown to the horizontal pipe 16, accumulates in the liquid accumulation bay 17, and is discharged from the liquid discharge hole 19 without entering the vertical pipe 15;

[0080] Step S5: After a preset time, open the tail gas outlet 6 to discharge the desulfurized tail gas from the tail gas outlet 6, and open the liquid outlet 4;

[0081] Step S6: The excess reaction liquid in Steps S3 and S4 falls onto the lower bottom plate 11 of the reaction chamber 3 due to gravity, flows through the branch 14 of the liquid-phase inlet pipe 12 from the liquid outlet hole 13 on the lower bottom plate 11 to the rotor 7 of the reaction chamber 3 in the next layer, and then repeats the steps in Step S4. Finally, the excess reaction liquid is discharged outside the closed housing 1 through the liquid outlet 4;

[0082] Step S7: Repeat Step S2, Step S4, and Step S6 until all desulfurization of the tail gas is completed, and then close the tail gas inlet 5, the liquid phase inlet pipe 12, and the liquid discharge port 4.

[0083] The embodiments of the present application have been described above in conjunction with the accompanying drawings. Without conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them belong to the protection scope of the present application.

Claims

1. A multi-stage tail gas desulfurization device, characterized in that ,include: A closed shell (1), wherein the closed shell (1) comprises a liquid discharge port (4), an exhaust gas inlet port (5), and an exhaust gas discharge port (6); A reaction chamber (3), wherein there are at least three reaction chambers (3), and the plurality of reaction chambers (3) are arranged in the sealed housing (1) along the axis direction of the spindle (2), and a rotor (7) is arranged in each reaction chamber (3); An exhaust gas flow channel structure, wherein the two ends of the exhaust gas flow channel structure are an exhaust gas inlet (5) and an exhaust gas outlet (6), respectively, and the exhaust gas flow channel structure allows the exhaust gas to flow through each reaction chamber (3) from bottom to top in sequence through the exhaust gas holes (8) of each reaction chamber (3); A liquid flow channel structure, wherein the liquid flow channel structure accelerates the reaction liquid entering the rotor (7), and the liquid flow channel structure can also accelerate the reaction liquid in excess deposited at the bottom of each reaction chamber (3) entering the rotor (7) in the next layer of reaction chamber (3); The tail gas flow channel structure and the liquid flow channel structure enable the tail gas flow direction and the reaction liquid flow direction in each reaction chamber (3) to react in the reaction chamber (3) in opposite directions, and the tail gas hole (8) is also provided with a liquid blocking structure (18) for preventing the reaction liquid in the reaction chamber (3) from flowing into the next layer of reaction chamber (3) through the tail gas hole (8).

2. A multi-stage tail gas desulfurization device according to claim 1, characterized in that: The tail gas flow channel structure comprises: Tail gas holes (8), each reaction chamber (3) is provided with the tail gas holes (8) on the upper top plate (10) and the lower bottom plate (11), and the two tail gas holes (8) are staggered with each other; A baffle (9) is fixedly arranged between the upper top plate (10) and the lower bottom plate (11) of each reaction chamber (3); the upper and lower ends of the baffle (9) are fixedly connected to the upper top plate (10) and the lower bottom plate (11); the left and right ends extend to the inner wall of the reaction chamber (3) and the outer side of the rotor (7), respectively; the baffle (9) is arranged on one side of the exhaust hole (8) to guide the exhaust gas; The tail gas holes (8) on the upper top plate (10) and the lower bottom plate (11) of the reaction chamber (3) are respectively arranged on both sides of the baffle (9).

3. A multi-stage tail gas desulfurization device according to claim 1, characterized in that: The liquid blocking structure (18) comprises: A vertical pipe (15), the vertical pipe (15) being connected to the tail gas hole (8) on the lower bottom plate (11) and extending perpendicularly to the lower bottom plate (11) toward the reaction chamber (3); A transverse tube (16), wherein the transverse tube (16) is parallel to the bottom plate (11) of the reaction chamber (3), and the middle portion of the transverse tube (16) is bent downward to form an arc-shaped liquid accumulation bay (17). A drainage hole (19) is provided at the bottom of the liquid accumulation bay (17), and the liquid in the liquid accumulation bay (17) can be discharged into the reaction chamber (3) through the drainage hole (19); One end of the transverse pipe (16) is connected to the other end of the vertical pipe (15) away from the lower base plate (11), the other end of the transverse pipe (16) faces the rotor (7), and the vertical pipe (15) and the vertical pipe (15) are hollow inside and connected to form an air intake channel.

4. A multi-stage tail gas desulfurization device according to claim 2, characterized in that: The liquid flow channel structure comprises: A liquid phase inlet pipe (12), wherein the liquid phase inlet pipe (12) is used to guide the reaction liquid into the rotor (7); A liquid outlet hole (13) is provided on the upper top plate (10) and the lower bottom plate (11) of each reaction chamber (3).

5. A multi-stage tail gas desulfurization device according to claim 4, characterized in that: Each reaction chamber (3) corresponds to a liquid phase inlet pipe (12), one end of the liquid phase inlet pipe (12) extends to the outside of the closed shell (1) to be connected to the liquid storage tank, and the other end extends into the rotor (7) of the corresponding reaction chamber (3).

6. A multi-stage tail gas desulfurization device according to claim 5, characterized in that: A liquid phase inlet pipe (12) corresponding to the reaction chamber (3) located between the uppermost reaction chamber (3) and the lowermost reaction chamber (3) is provided with a branch (14) at the liquid outlet (13) of the upper top plate (10); the branch (14) is connected to the liquid outlet (13) and can receive excess reaction liquid discharged from the liquid outlet (13) and guide it into the rotor (7).

7. A multi-stage tail gas desulfurization device according to claim 4, characterized in that: The lower bottom plate (11) of each reaction chamber (3) is inclined toward the liquid outlet hole (13).

8. A multi-stage tail gas desulfurization device according to claim 7, characterized in that: The inclination angle of the lower base plate (11) is 1-2°.

9. The multi-stage tail gas desulfurization device according to claim 1, characterized in that: The liquid discharge port (4) is arranged at the bottom of the sealed shell (1), the exhaust gas inlet (5) is arranged at the lower side of the sealed shell (1), and the exhaust gas discharge port (6) is arranged at the bottom of the sealed shell (1).

10. The multi-stage tail gas desulfurization device according to any one of claims 1 to 9, characterized in that ,The working process includes the following steps: Step S1: opening the tail gas inlet (5), and allowing the tail gas to enter the sealed housing (1) from the tail gas inlet (5); Step S2: the tail gas is discharged from the tail gas hole (8) of the lower bottom plate (11) of the reaction chamber (3) at the bottom layer to the rotor (7) through the vertical pipe (15) and the horizontal pipe (16) of the liquid blocking structure (18) in sequence, and the tail gas is blocked by the baffle (9) and flows in a direction away from the baffle (9), and finally flows from the tail gas hole (8) on the upper top plate (10) of the reaction chamber (3) on the other side of the baffle (9) to the reaction chamber (3) at the upper layer; Step S3: opening the liquid phase inlet pipe (12), and allowing the reaction liquid to flow from the liquid phase inlet pipe (12) into the rotor (7) of each reaction chamber (3); Step S4: the rotor (7) accelerates the reaction liquid and throws it out to collide with the tail gas in the reaction chamber (3). Part of the reaction liquid is thrown to the horizontal pipe (16), accumulates in the liquid accumulation bay (17), and is discharged from the drain hole (19) without entering the vertical pipe (15); Step S5: After a preset time has passed, the tail gas outlet (6) is opened to allow the desulfurized tail gas to be discharged from the tail gas outlet (6), and the liquid outlet (4) is opened; Step S6: the excess reaction liquid in step S3 and step S4 falls onto the lower bottom plate (11) of the reaction chamber (3) due to gravity, flows from the liquid outlet (13) of the lower bottom plate (11) through the branch (14) of the liquid phase inlet pipe (12) to the rotor (7) of the next layer of the reaction chamber (3), and then repeats the steps in step S4. Finally, the excess reaction liquid is discharged to the outside of the closed housing (1) through the liquid outlet (4); Step S7: Repeat steps S2, S4 and S6 until all tail gas desulfurization is completed, and close the tail gas inlet (5), the liquid phase inlet pipe (12) and the liquid outlet (4).

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