An L-shaped flue gas side air intake device for a ship flue gas desulfurization treatment tower

Abstract

The present invention discloses a novel air intake structure for a ship exhaust desulfurization treatment tower, namely an L-shaped flue gas side air intake device, comprising the L-shaped flue gas side air intake device located at the bottom of a desulfurization tower (6), an air intake port (1) provided on the side of the air intake device, the air intake port (1) being connected to an air intake duct (2), an annular flue inside the device, a first-stage umbrella cap (4) and a second-stage umbrella cap (5) provided above the annular flue, the first-stage umbrella cap (4) and the second-stage umbrella cap (5) being respectively connected to the inside of the desulfurization tower, and a drain port (3) being provided at the bottom of the desulfurization tower. The present invention is located at the bottom of the desulfurization tower, an air intake port is arranged on the side of the air intake device, an exhaust pipe of the engine is directly connected to the desulfurization tower through the air intake port, and the high-temperature and high-speed flue gas discharged by the engine can be cooled and decelerated after passing through the L-shaped side air intake device designed with a special flow field simulation, and finally enters the spray reaction zone in the desulfurization tower at a certain temperature and a stable flow rate.

Description

Technical Field

[0001] The invention relates to an L-shaped flue gas side air intake device for a ship flue gas desulfurization treatment tower, belonging to the technical field of ship flue gas desulfurization cleaning systems. Background Art

[0002] The main connection between the ship's flue gas desulfurization treatment tower and the ship's engine flue gas pipeline is achieved through the air intake device on the desulfurization tower. The design of the air intake device must meet two requirements: first, it must be able to easily connect to the engine exhaust pipe and second, it must achieve a cooling and deceleration effect on the flue gas. Because the flue gas discharged from the engine is a high-temperature, high-velocity mixed gas, in order to fully neutralize the flue gas with the alkaline spray liquid in the desulfurization tower and desulfurize it, the flue gas must flow into the neutralization reaction zone of the desulfurization tower at a certain temperature and velocity. Therefore, the flue gas must complete the cooling and deceleration process when passing through the air intake device. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an L-shaped flue gas side air intake device for a ship flue gas desulfurization treatment tower.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] The present invention provides an L-shaped flue gas side air intake device for a ship flue gas desulfurization treatment tower, comprising the L-shaped flue gas side air intake device being located at the bottom of the desulfurization tower (6), an air inlet (1) being provided on the side of the air intake device, the air inlet (1) being connected to an air inlet duct (2), the air inlet duct (2) being an annular flue (9), a first-stage umbrella cap (4) and a second-stage umbrella cap (5) being provided above the air inlet duct (2), the first-stage umbrella cap (4) and the second-stage umbrella cap (5) being respectively connected to the interior of the desulfurization tower (6), and a drain outlet (3) being provided at the bottom of the air intake device.

[0006] A spray device (7) is provided on the upper portion of the desulfurization tower (6) for spraying alkaline spray liquid. The space inside the inner wall of the annular flue (9) of the air inlet duct (2) is the area where the two-stage umbrella cap communicates with the interior of the desulfurization tower and is also the area where wastewater after the spray liquid reacts with the flue gas flows out of the desulfurization tower. This inner wall space can be used to separate the wastewater and flue gas inlets to prevent wastewater from flowing back into the engine flue gas duct.

[0007] Through the L-shaped side air intake, the high-temperature, high-velocity exhaust from the engine is evenly distributed and flows upward through the annular flue. After passing through two-stage caps, it enters the desulfurization tower at a controlled temperature and velocity. Alkaline spray liquid descends from the top of the desulfurization tower, where it comes into contact with and neutralizes the flue gas flowing into the tower through the caps. The resulting wastewater flows out of the drain port at the bottom of the inner wall.

[0008] Analysis and comparison of the present invention with the prior art:

[0009] At present, the main types of air intake devices are Type I (see Appendix Figure 2 ) and U-shaped air intake (see attached Figure 3 ), Type I means that the air intake device is at the bottom of the desulfurization tower, the air intake is located at the bottom, and the engine exhaust pipe is directly connected to the desulfurization tower from the bottom. The design and layout are compact and occupy less space on the ship during installation. Because it is a direct through-type connection without bends, the pipeline back pressure resistance caused to the engine is also small. The alkaline spray liquid falls in the form of mist from the top of the desulfurization tower and contacts the upward flowing flue gas for a neutralization reaction. As a result of the neutralization reaction, the sulfur in the flue gas is carried away by the spray liquid to form acidic wastewater, which flows away from the drain port on the side of the air intake device. The Type I air intake device achieves a speed reduction effect through the air intake duct and the two-stage umbrella cap. The cooling of the flue gas is achieved by heat exchange between the two-stage umbrella cap and the spray liquid. When the high-temperature flue gas flows through the umbrella cap, it transfers heat to the umbrella cap. When the spray liquid is scattered on the umbrella cap, it absorbs the heat and takes it away, finally achieving the purpose of flue gas cooling. Since the engine exhaust pipe of the Type I air intake device needs to be directly connected to the desulfurization tower from the bottom, and the size of the desulfurization tower is generally larger than the ship's chimney, the installation of the desulfurization tower of the Type I air intake device requires the large-scale dismantling and reconstruction of the ship's chimney, which requires a relatively large workload for ship modification.

[0010] The U-shaped air intake device refers to an external vertical cooling pipe located on the side of the desulfurization tower, forming a shape similar to the letter U with the desulfurization tower. This cooling pipe is mainly used to cool and reduce the speed of the flue gas. The lower part of the cooling pipe is connected to the lower side of the desulfurization tower, and the upper part of the cooling pipe is connected to the flue gas pipe. There is a cooling spray device (8) in the cooling pipe. The flue gas enters from the upper part of the cooling pipe, and the temperature drops after the pre-cooling spray. Then it flows downward through the cooling pipe and gradually reduces its speed. Then it enters from the lower side of the desulfurization tower and finally flows out from the upper outlet of the desulfurization tower. During the whole process, the flue gas needs to change direction downward and then go up, which causes a relatively large flue gas back pressure resistance to the engine. The alkaline spray liquid falls in the form of mist from the upper part of the desulfurization tower and contacts the flue gas ascending in the desulfurization tower to undergo a neutralization reaction. The waste water after the reaction flows away from the drain outlet in the middle of the bottom of the desulfurization tower. The desulfurization tower equipped with a U-shaped air intake device can be designed and arranged outside the ship's chimney due to the existence of an external cooling pipe. By simply opening a hole in the side of the chimney, the exhaust pipe is led out and connected to the inlet of the cooling pipe. Therefore, the desulfurization tower with a U-shaped air intake device is relatively easy to design and arrange. The disadvantage is that it needs to occupy a large part of the space outside the ship's chimney.

[0011] These two air intake devices each have their own advantages and disadvantages. The advantage of the I-type air intake device is that it has a compact structure, occupies a small space, and has a small back pressure resistance of the flue gas pipeline, which is conducive to the flow of flue gas. However, it requires the expansion and modification of the ship's chimney, and the workload of ship modification is relatively large. The advantage of the U-type air intake device is that the exhaust pipe can be led out of the ship's chimney and connected to the desulfurization tower. In this way, the desulfurization tower is not restricted by the space in the chimney and can be designed and arranged in a relatively free area on the ship. The disadvantage is that the overall size of the desulfurization tower is relatively large, which will take up a large area of ​​the ship; and due to the cooling pipe, the flue gas needs to go through multiple large-angle changes in direction when passing through, resulting in a relatively large back pressure resistance of the engine flue gas, which is not conducive to the flow of flue gas.

[0012] Although, after years of development, the U-type and I-type air intake device technologies on existing ship exhaust gas desulfurization tower products are relatively mature, the prominent defects of these two structural forms still plague desulfurization tower manufacturers and shipowners. If there is a new air intake form of desulfurization tower that can avoid the shortcomings or part of the shortcomings of the above two air intake devices, that is, a desulfurization tower air intake form that occupies less space on the ship, has low flue gas back pressure resistance, and is easy to install and arrange, it will solve very important troubles and problems for manufacturers and shipowners, and provide more and better options for the design and arrangement of ship exhaust gas cleaning desulfurization towers.

[0013] The beneficial effects of the present invention are as follows: the L-shaped side air intake device does not require the cooling pipe of the U-shaped air intake device, and can also be connected to the desulfurization tower from the side, so it can be installed in the area outside the ship's chimney, but the space occupied is smaller than the desulfurization tower of the U-shaped air intake device. The L-shaped side air intake device uses computer flow field simulation design software to redesign the original I-type central two-stage umbrella cap into an inward-inclined annular two-stage umbrella cap, so that the flue gas flowing out of the umbrella cap changes from annular rising diffusion to rising diffusion from the middle to the periphery. The redesigned umbrella cap structure reduces the escape phenomenon caused by uneven rising and diffusion of flue gas, increases the contact area between flue gas and spray liquid, and improves the efficiency of the neutralization reaction. The L-shaped side air intake device has only one bend, the flue gas flow is relatively smooth, and the engine flue gas back pressure resistance is relatively small. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0015] Figure 1 Structural diagram of the L-shaped flue gas side air intake device of the present invention.

[0016] Figure 2 This is a structural diagram of a Type I air intake device in the prior art.

[0017] Figure 3 It is a structural diagram of a U-shaped air intake device in the prior art.

[0018] Figure 4 This is the physical structure diagram of the L-shaped flue gas side air intake device.

[0019] In the attached figure:

[0020] 1. Air inlet; 2. Air inlet duct; 3. Drain outlet; 4. First-stage umbrella cap; 5. Second-stage umbrella cap; 6. Desulfurization tower; 7. Spraying device; 8. Cooling spraying device; 9. Annular flue.

[0021] Figure 1-3 In the figure, the solid arrows represent the direction of the spray liquid, and the hollow arrows represent the direction of the flue gas. DETAILED DESCRIPTION

[0022] Example 1

[0023] This embodiment provides an L-shaped flue gas side air intake device for a ship flue gas desulfurization treatment tower, comprising the L-shaped flue gas side air intake device being located at the bottom of the desulfurization tower (6), an air inlet (1) being provided on the side of the air intake device, the air inlet (1) being connected to an air inlet duct (2), the interior of the air inlet duct (2) being an annular flue, a first-stage umbrella cap (4) and a second-stage umbrella cap (5) being provided above the air inlet duct (2), the first-stage umbrella cap (4) and the second-stage umbrella cap (5) being respectively connected to the interior of the desulfurization tower, and a drain outlet (3) being provided at the bottom of the air intake device.

[0024] A spray device (7) is provided on the upper portion of the desulfurization tower (6) for spraying alkaline spray liquid. The space inside the inner wall of the annular flue of this device is the area where the two-stage umbrella cap is connected to the interior of the desulfurization tower, and is also the area where the wastewater after the spray liquid neutralization reaction flows out of the desulfurization tower. This inner wall space can be used to separate the wastewater and flue gas inlets to prevent wastewater from flowing back into the engine flue gas pipe.

[0025] Specifically, the L-shaped flue gas side intake device is located at the bottom of the desulfurization tower, with an air inlet on its side. The interior of the intake device consists of an annular flue and an inner wall space. Above the annular flue are the first and second caps, which are connected to the interior of the desulfurization tower. Drain holes are located at the bottom of the inner wall space. The specific operating process of the L-shaped flue gas side intake device is as follows: first, the engine exhaust duct is directly connected to the air inlet of the intake device, and the flue gas enters the annular flue through the air inlet. The flue gas undergoes an initial deceleration within the annular flue, forming a circular distribution and rising. Upon reaching the first cap, a portion of the flue gas flows in an S-shaped pattern, decelerating and transferring heat to the cap. The cap then removes the heat through a spray liquid applied to the cap. After this process, the flue gas finally flows into the desulfurization tower. The remaining flue gas continues to rise and reaches the second cap, where it undergoes the same deceleration and cooling process as the first cap before flowing into the desulfurization tower. After passing through these two levels of umbrella caps, the flue gas reaches a velocity and temperature suitable for contact with the alkaline spray liquid and the neutralization and desulfurization reaction. The flue gas then rises and diffuses evenly from the center to the surrounding areas, through the upper part of the umbrella cap, and into the desulfurization tower, thereby improving desulfurization efficiency and effectiveness. The alkaline spray liquid is evenly sprayed down the upper part of the desulfurization tower in the form of a mist, neutralizing the rising flue gas. The acidic wastewater produced by the neutralization reaction flows out through the drain in the center of the desulfurization tower. The desulfurized flue gas meets relevant emission standards and is discharged into the atmosphere through the outlet at the top of the desulfurization tower.

[0026] Figure 1 、 Figure 2 and Figure 3 The following diagrams show different scrubber designs with different air intake arrangements under the same design conditions. The order of space occupied, from lowest to highest, is I-type > L-type > U-type. The order of installation difficulty, from easiest to most difficult, is L-type > U-type > I-type. The order of backpressure resistance to engine exhaust, from lowest to highest, is I-type > L-type > U-type. Therefore, the L-type side air intake arrangement offers significant advantages, combining the advantages of both the I-type and U-type arrangements while also offering some breakthroughs. The implementation of the L-type side air intake arrangement provides a new option for scrubber manufacturers and shipowners.

[0027] By comparing documents Figure 1-3The technical structural features of the present invention show that the L-shaped side air intake device is located at the bottom of the desulfurization tower, with an air intake arranged on the side of the air intake device. The engine exhaust duct is directly connected to the desulfurization tower through the air intake. The high-temperature and high-speed exhaust gas from the engine is cooled and slowed down after passing through the L-shaped side air intake device, which is specially designed for flow field simulation. Finally, it enters the spray reaction zone within the desulfurization system at a certain temperature and stable flow rate. The desulfurization tower equipped with an L-shaped side air intake can be designed and installed outside the ship's chimney. The engine exhaust duct does not need to pass through the external cooling duct like the U-shaped air intake device, nor does it require large-scale demolition, expansion and renovation of the chimney to meet the installation requirements like the I-type air intake device. Instead, the exhaust duct is simply opened in the ship's chimney to lead to the L-shaped air intake device. Therefore, the L-shaped side air intake device occupies more space on the ship than the U-shaped air intake device and is easier to design, arrange and implement than the I-type air intake device. It also has only one large-angle turning bend, which makes the flue gas flow smoother and reduces the flue gas backpressure resistance on the engine.

[0028] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should fall within the scope of protection of the present invention.

Claims

1. An L-shaped flue gas side air intake device for a ship flue gas desulfurization treatment tower, characterized in that: The L-shaped flue gas side air intake device is located at the bottom of the desulfurization tower (6), an air inlet (1) is provided on the side of the air intake device, the air inlet (1) is connected to the air inlet duct (2), the air inlet duct (2) is internally an annular flue (9), a first-stage umbrella cap (4) and a second-stage umbrella cap (5) are provided above the annular flue (9), the first-stage umbrella cap (4) and the second-stage umbrella cap (5) are in an inverted cone structure; the first-stage umbrella cap (4) and the second-stage umbrella cap (5) are respectively connected to the inside of the desulfurization tower, and the bottom of the air intake device is an exhaust The flue gas is initially decelerated in the annular flue (9) and forms a ring-shaped distribution and rises. After reaching the first umbrella cap (4), a part of the flue gas flows in an S-shaped manner at the first umbrella cap (4) to decelerate and transfers heat to the umbrella cap. The umbrella cap takes away the heat through the spray liquid on the umbrella cap. After this process, the flue gas finally flows into the desulfurization tower, and the remaining flue gas continues to rise to the second umbrella cap (5), and flows into the desulfurization tower after the same deceleration and cooling process as the first umbrella cap (4).

2. The L-shaped flue gas side air intake device for a ship flue gas desulfurization treatment tower according to claim 1 is characterized in that: A spray device (7) is provided on the upper portion of the desulfurization tower (6).

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