A ship flue gas desulfurization tower

Abstract

The present invention provides a ship flue gas desulfurization tower, belonging to the technical field of desulfurization. It solves the problem of the desulfurization tower adapting to the ship working conditions in the prior art. This ship flue gas desulfurization tower includes a tower body, a smoke inlet, a smoke outlet, and a spray layer. The spray layer includes an annular deformation frame, and the annular deformation frame includes an arc-shaped scissor unit. The arc-shaped scissor unit includes a first arc-shaped rod body and a second arc-shaped rod body. The middle parts of the first arc-shaped rod body and the second arc-shaped rod body are rotationally connected through a middle hinge. The corresponding end parts of the arc-shaped rod bodies of adjacent arc-shaped scissor units are rotationally connected to each other through an end hinge to form the annular deformation frame that is integrally arc-shaped. Nozzles are arranged on the arc-shaped rod bodies. By arranging the nozzles on the annular deformation frame to form a spray layer with flexible adjustment, the present invention can achieve flexible adjustment of spraying according to the ship working conditions or the flue gas conditions in the tower body, so as to adapt to the desulfurization requirements, facilitate the maintenance of the equipment, and meet the ship requirements.

Description

Technical Field

[0001] The invention belongs to the technical field of desulfurization towers, in particular to a desulfurization tower used on ships. Background Art

[0002] The International Maritime Organization (IMO), in accordance with the global marine sulfur limit regulations, requires ships registered with classification societies in member countries to actively implement the resolution. From January 1, 2020, the sulfur content of marine fuel used by seagoing ships entering the emission control area shall be less than 0.5%. The Ministry of Transport of China has also issued relevant "sulfur limit" regulations for Chinese waters, which has accelerated the development of the ship desulfurization market. At present, the desulfurization of fuel flue gas by ships mainly uses a desulfurization tower, which is equipped with a spray layer. The spray layer is mainly a nozzle, which sprays liquid to absorb sulfides in the flue gas when the flue gas passes through the desulfurization tower.

[0003] Ship flue gas desulfurization towers mainly include open-loop desulfurization towers, closed-loop desulfurization towers, and hybrid desulfurization towers.

[0004] The open-loop desulfurization tower uses seawater to clean the flue gas. Seawater is usually alkaline, which makes it have natural acid-base buffering capacity and the ability to absorb sulfides. The seawater neutralizes the sulfides in the flue gas to achieve the purpose of desulfurization. The washing process of the open-loop desulfurization tower: Seawater is pumped into the desulfurization tower and sprayed out through the nozzle inside the desulfurization tower, reacting with the flue gas passing through the desulfurization tower. The flue gas after desulfurization continues to go up through the gas monitoring system and then discharged into the atmosphere, while the seawater solution that neutralizes the sulfide goes down through the water quality detection system and then flows into the sea through the seawater discharge system. The open-loop desulfurization tower system has a relatively simple structure and is relatively easier to install, modify and install on ships. The direct use of seawater saves the cost of chemicals, but whether it will have a long-term impact on the marine environment is not suitable for some seawater with strict emission requirements.

[0005] The closed-loop desulfurization tower adds desulfurization agents to fresh water to absorb sulfides in the flue gas. Fresh water is clean water for recycling, while seawater is only used as cooling water to cool the circulating fresh water. Seawater does not directly react with the flue gas as a washing solution. The washing process of the closed-loop desulfurization tower: first add an appropriate amount of desulfurization agent according to the load of the ship. During the desulfurization work, the desulfurization agent and fresh water are mixed in the circulation cabinet and then enter the desulfurization tower. The action process in the desulfurization tower is similar to that of the open-loop type, but the destination of the solution after washing is different from that of the open type, which is directly discharged into the sea. The solution after washing in the closed-loop desulfurization tower circulates into the circulation cabinet. When the solution concentration and residual impurities in the circulation cabinet reach a fixed value, the water treatment unit begins to separate the solution. The separated residual impurities are moved into the storage cabinet, and the separated water re-enters the circulation cabinet and replenishes the desulfurization agent. The washing solution after replenishing the agent is cooled by the seawater cooling system and re-enters the desulfurization tower, thereby starting the circulation washing work.

[0006] The fresh water desulfurization part of the closed-loop desulfurization tower system is a closed-loop design. The mixed solution of fresh water and desulfurizing agent participating in the reaction is not directly discharged into the sea. The residue in the storage cabinet will be transferred and processed when the ship docks. Therefore, the closed-loop desulfurization tower is a true zero-emission. However, the closed-loop desulfurization tower has many system components, occupies a large space on the ship, and the installation, retrofit and installation costs also increase accordingly. Moreover, the desulfurization agent is also a consumable item.

[0007] The hybrid desulfurization tower is an organic combination of open-loop and closed-loop desulfurization towers, and can be switched between open and closed modes according to needs during desulfurization work. The basic composition of the hybrid desulfurization tower system includes the components of the open-loop and closed-loop desulfurization tower systems, and its control module adds functions such as automatic switching and more detection and monitoring points. The washing process of the hybrid desulfurization tower: In the open mode, seawater is used to wash the flue gas for desulfurization, which is the same as the working method of the open-loop desulfurization tower; in the closed mode, a circulating solution of fresh water added with desulfurizing agent is used to wash the flue gas for desulfurization, which is the same as the working method of the closed-loop desulfurization tower.

[0008] The hybrid desulfurization tower system can flexibly select between the two modes. In waters without drainage requirements, the open mode can be used to desulfurize with natural seawater, reducing the consumption of desulfurizing agent and lowering costs; in waters with strict sulfur emissions control, the closed mode can be used to meet the zero-emission requirements. The benefits of the dual mode also come at a cost. The initial installation, retrofit and installation costs also increase significantly, it occupies more space on the ship, and two tower bodies are required, which is extremely disadvantageous for ships with precious space.

[0009] The functions of each spray layer are usually different, and the operating conditions of the ship's main engine often change, causing fluctuations in the flue gas velocity, density, temperature, and sulfur content. For example, when the ship is sailing, the power is relatively high, the flue gas is large, the temperature is high, the wind and waves are large, and the discharged flue gas is easily blown away in time, and the discharged seawater is easily diluted and degraded, which is suitable for open-loop desulfurization; when the ship is sailing or berthed in the harbor, the flue gas is small, the temperature is low, the wind and waves are small, and the discharged flue gas is not easily blown away in time, and the discharged seawater is not easily diluted and degraded, which is suitable for the closed-loop desulfurization tower. If the temperature of the flue gas is too high, when the flue gas just enters the desulfurization tower, it needs to be cooled by spraying cooling water first to timely reduce the speed and temperature, so as to extend the residence time in the tower and the impact and corrosion on the objects in the tower; if the temperature of the flue gas is not high, after passing through the spray layer, it is further reduced. When discharging from the smoke outlet, if the external temperature is also relatively low, it is easy to form condensate droplets near the tower smoke outlet and fall off. This has a greater impact on the berthed ship. The droplets are not easily blown away and are more likely to fall on the ship, causing pollution. At this time, there is no need to spray cooling water, and the cooling water spray layer is in an idle state. If it is still in the lowest layer, it will not only be corroded by the liquid sprayed from above in vain, but also interfere with desulfurization.

[0010] In addition, when a ship sails on the vast ocean, it takes a long time to dock. If a spray layer of the desulfurization tower breaks down and cannot be repaired in time, and the broken spray layer is not removed in time, it will not only affect the desulfurization effect of other spray layers but also accelerate its own damage, such as scaling and corrosion. Moreover, the existing desulfurization towers are not convenient for removing and adjusting the spray layers.

[0011] In summary, there is an urgent need for a marine flue gas desulfurization tower with a spray layer that can be flexibly adjusted. Summary of the Invention

[0012] The purpose of the present invention is to address the above problems existing in the prior art and propose a marine flue gas desulfurization tower, which has an adjustable spray layer.

[0013] The purpose of the present invention can be achieved by the following technical solutions: A marine flue gas desulfurization tower includes a tower body, a smoke inlet, a smoke outlet, and a spray layer located between the smoke inlet and the smoke outlet. The spray layer includes an annular deformation frame, and the annular deformation frame includes an arc-shaped scissor unit. The arc-shaped scissor unit includes a first arc-shaped rod and a second arc-shaped rod. The middle parts of the first arc-shaped rod and the second arc-shaped rod are rotatably connected by a middle hinge, and the corresponding ends of the arc-shaped rods of adjacent arc-shaped scissor units are rotatably connected to each other by an end hinge to form the annular deformation frame that is integrally arc-shaped. Nozzles are arranged on the first arc-shaped rod and the second arc-shaped rod, and the nozzles are connected to an external liquid supply device through pipelines. A telescopic device is arranged between the first arc-shaped rod and the second arc-shaped rod, and the telescopic device controls the change of the angle between the first arc-shaped rod and the second arc-shaped rod. The annular deformation frame is suspended in the tower body by a suspension device, and the suspension device controls the lifting of the annular deformation frame in the tower body.

[0014] In some embodiments, there are at least two annular deformation frames.

[0015] In some embodiments, several annular deformation frames are arranged in layers up and down in the tower body.

[0016] In some embodiments, the nozzles on different annular deformation frames are connected to different liquid supply devices.

[0017] In some embodiments, the distance between the suspension rods is controlled by a distance adjustment device.

[0018] In some embodiments, the annular deformation frame includes a plurality of concentrically nested ones.

[0019] Compared with the prior art, the present marine flue gas desulfurization tower has the following advantages:

[0020] In the present invention, by arranging the nozzle on the annular deformable frame to form a spray layer that can be flexibly adjusted, the spray can be flexibly adjusted according to the ship's working conditions or the flue gas conditions inside the tower, so as to meet the desulfurization requirements, or facilitate the maintenance of the equipment and meet the usage requirements of the ship. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In the drawings (which are not necessarily drawn to scale), similar reference numerals may describe similar components in different views. Similar reference numerals with different letter suffixes may represent different examples of similar components. The drawings generally illustrate, by way of example and not limitation, the various embodiments discussed herein.

[0022] Figure 1 is a schematic diagram of an annular deformable frame arranged inside the tower;

[0023] Figure 2 is Figure 1 a schematic diagram of the unfolded annular deformable frame;

[0024] Figure 3 is a schematic diagram of the reduced annular deformable frame located above the unfolded annular deformable frame;

[0025] Figure 4 is a schematic diagram of the unfolded annular deformable frame located above the reduced annular deformable frame;

[0026] Figure 5 is Figure 4 a schematic diagram of both annular deformable frames being unfolded;

[0027] Figure 6 is Figure 1 a top view schematic diagram inside the tower;

[0028] Figure 7 is a schematic diagram of the annular deformable frame slightly unfolded;

[0029] Figure 8 is a schematic diagram of the annular deformable frame fully unfolded;

[0030] Figure 9 is Figure 3 a top view schematic diagram of the annular deformable frame;

[0031] Figure 10 is a schematic diagram of an annular deformable frame arranged inside the tower in Embodiment 2;

[0032] Figure 11 is Figure 10 a top view schematic diagram inside the tower;

[0033] Figure 12 is a schematic diagram of two annular deformable frames arranged inside the tower in Embodiment 2;

[0034] Figure 13 is Figure 12 a top - down schematic view inside the tower body.

[0035] In the figure, there are tower body 1, smoke inlet 2, smoke outlet 3, tower top cover 4, annular deformation frame 5, first arc - shaped rod 501, second arc - shaped rod 502, middle hinge 503, inner - end hinge 504, outer - end hinge 505, nozzle 506, pipeline 6, telescopic cylinder 7, suspension device 8, suspension rod 9, bending section 901, and spacing adjustment device 11. Specific Embodiments

[0036] The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described in conjunction with the drawings. However, the present invention is not limited to these embodiments, and the following embodiments do not limit the invention involved in the claims. In addition, all combinations of the features described in the embodiments are not necessarily required for the solution of the invention.

[0037] Those of ordinary skill in the art should understand that all directional references (e.g., above, below, upward, up, downward, down, top, bottom, left, right, vertical, horizontal, etc.) are used descriptively for the drawings to help the reader understand and do not represent (e.g., for position, orientation, use, etc.) a limitation on the scope of the present invention defined by the appended claims. Additionally, the term "substantially" may refer to a slight inaccuracy or slight deviation in conditions, quantities, values, or dimensions, some of which are within the manufacturing tolerances or margins of error.

[0038] Embodiment 1

[0039] As Figures 1 to 9 shown, a ship flue - gas desulfurization tower includes a tower body 1, a smoke inlet 2, a smoke outlet 3, a tower top cover 4, and a spray layer located between the smoke inlet and the smoke outlet, which sprays liquid to absorb sulfides in the flue gas.

[0040] The spray layer mainly includes an annular deformation frame 5. The annular deformation frame includes an arc - shaped scissor unit. The arc - shaped scissor unit includes two identical arc - shaped rods, defined as the first arc - shaped rod 501 and the second arc - shaped rod 502. The middle parts of the first arc - shaped rod and the second arc - shaped rod are rotationally connected through a middle hinge 503 to form an arc - shaped scissor unit.

[0041] The corresponding ends of the arc - shaped rods of adjacent arc - shaped scissor units are rotationally connected to each other through end hinges to form the annular deformation frame as a whole in an arc shape, as Figure 6 , 7As shown in FIGS. 8, the arc length of the annular deformable frame changes with the change in the angle between the first arc-shaped rod and the second arc-shaped rod. For convenience of description, it is defined that when the annular deformable frame deforms, the end hinge located on the inner side of the arc is the inner end hinge 504, and the end hinge located on the outer side of the arc is the outer end hinge 505.

[0042] Nozzles 506 are provided on the first arc-shaped rod and the second arc-shaped rod. The nozzles can also be provided at the hinges. The nozzles are connected to an external liquid supply device through pipelines 6 to supply liquid to the nozzles. To make the view clear, only the pipelines are schematically shown in Figure 1 the figure.

[0043] A telescopic device is provided between the first arc-shaped rod and the second arc-shaped rod. The telescopic control of the telescopic device changes the angle between the first arc-shaped rod and the second arc-shaped rod. For example, as shown in the figure, a telescopic cylinder 7 can be connected between the inner end hinge and the outer end hinge. When the telescopic cylinder shortens, the annular deformable frame becomes longer, that is, the annular deformable frame is in an unfolded state, the diameter becomes larger, and the spraying range is close to the tower wall, thereby adjusting the density and spraying position of the nozzles. Of course, it can also be other telescopic devices, as long as the distance between the inner end hinge and the outer end hinge can be adjusted.

[0044] The annular deformable frame is suspended in the tower body by a suspension device 8. The suspension device controls the lifting of the annular deformable frame in the tower body. The suspension device can be a suspension rod 9 controlled by a lifting device. By moving the suspension device, the annular deformable frame can be moved, so as to facilitate the adjustment of the spraying position or the replacement of the annular deformable frame. Of course, it can also be other suspension devices, such as a towing rope, and the lifting control is achieved by retracting and releasing the towing rope.

[0045] As Figure 3 shown in 4 FIGS. 5 and 9, there are two annular deformable frames. Thus, the annular deformable frames can move relative to each other in the tower body.

[0046] The nozzles on different annular deformable frames can be connected to different liquid supply devices for spraying different liquids. For example, some can be used to spray seawater, some can be used to spray a mixed solution of fresh water and desulfurizer, or the spraying amounts of the nozzles on different annular deformable frames are different.

[0047] The position of the annular deformation frame can also be circumferentially moved by means of a moving suspension device, so as to flexibly adjust the injected liquid at different positions according to the flue gas flow field conditions inside the tower. For example, if the sulfide or other particulate matters in a certain direction inside the tower are significantly higher (this can be measured by sensors or obtained through long-term experience, and affected by the ship's working conditions and equipment differences, the flue gas flow fields of the desulfurization towers on each ship have their own characteristics under different working conditions), the position or density of the nozzles can be changed by moving the position of the annular deformation frame or adjusting the radius of the annular deformation frame. Of course, this kind of adjustment is usually carried out periodically according to the voyage or season.

[0048] When it is necessary to swap the upper and lower positions of the upper and lower spray layers, it can be done as Figure 3 , 4 shown. First, contract one annular deformation frame and expand the other annular deformation frame, so that the contracted annular deformation frame can pass through the middle of the expanded one and move downward or upward, thereby adjusting the injection positions or liquid types of different layers. Through this moving function, it is also convenient to take out or replace the spray layer, which is suitable for use during ship navigation. According to this principle, it can also be set up in multiple layers to achieve nesting or movement of multiple layers.

[0049] Embodiment 2

[0050] As Figure 10 , 11 , 12, 13 shown, different from the above embodiment, the annular deformation frame is suspended by two suspension rods located at both ends of the annular deformation frame, and the distance between the two suspension rods is controlled by a distance adjustment device 11, so that the telescopic cylinder connected between the inner end hinge and the outer end hinge can be omitted, and the deformation control of the annular deformation frame can be achieved by controlling the suspension rods at both ends outside the tower. In order not to affect the suspension of the suspension rods between the upper and lower spray layers, the suspension rods can be set in a bent state, that is, the bent section 901 towards the center, so that the suspension rods can pass through the middle of the annular deformation frame.

[0051] Although this article uses some terms more, it does not exclude the possibility of using other terms. These terms are only used to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention. For the execution order of actions, steps, etc. in the devices and methods shown in the specification and drawings, as long as there is no specific order limitation, and as long as the output of the previous process is not used in the subsequent process, it can be implemented in any order. The descriptions using "first", "then", etc. for convenience of description do not mean that it must be implemented in such an order.

[0052] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains may make various modifications or supplements to the described specific embodiments or use similar means for substitution, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A ship flue gas desulfurization tower, comprising a tower body, a flue gas inlet, a flue gas outlet, and a spray layer located between the flue gas inlet and the flue gas outlet, characterized in that, The spray layer includes an annular deformation frame, the annular deformation frame includes an arc-shaped scissor unit, the arc-shaped scissor unit includes a first arc-shaped rod body and a second arc-shaped rod body, the middle parts of the first arc-shaped rod body and the second arc-shaped rod body are rotationally connected through a middle hinge, and the corresponding end parts of the arc-shaped rod bodies of adjacent arc-shaped scissor units are rotationally connected to each other through an end hinge to form the annular deformation frame which is integrally arc-shaped. Nozzles are arranged on the first arc-shaped rod body and the second arc-shaped rod body, the nozzles are connected to an external liquid supply device through pipelines, a telescopic device is arranged between the first arc-shaped rod body and the second arc-shaped rod body, and the telescopic device controls the change of the angle between the first arc-shaped rod body and the second arc-shaped rod body. The annular deformation frame is suspended in the tower body through a suspension device, and the suspension device controls the lifting of the annular deformation frame in the tower body; there are at least two annular deformation frames; several annular deformation frames are arranged in upper and lower layers in the tower body; the distance between the suspension rods is controlled by a distance adjusting device.

2. The flue gas desulfurization tower for ships according to claim 1, characterized in that, The nozzles on different annular deformation frames are connected to different liquid supply devices.

3. The flue gas desulfurization tower for ships according to claim 1, characterized in that, The annular deformation frame includes a plurality of concentrically nested ones.

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