Improved ship desulfurization system based on wet vibrating wire dust removal

Abstract

The improved ship desulfurization system comprises a fan, a vibrating wire dust removal device, a desulfurization tower and a smoke exhaust channel, an air outlet of the fan is connected with an air inlet of the desulfurization tower through a pipeline via the vibrating wire dust removal device, and an air outlet in the top of the desulfurization tower is connected with the smoke exhaust channel; the vibrating wire dust removal device is a wet type vibrating wire dust removal device, a spraying layer and a three-phase rectification reactor are sequentially arranged in the desulfurization tower from top to bottom, and an air inlet of the desulfurization tower is arranged below the three-phase rectification reactor. According to the invention, the emission effect is ensured, the energy-saving effect is improved, and the precious space and electric energy of the ship are effectively saved.

Description

Technical Field

[0001] The present invention specifically relates to an improved ship desulfurization system based on wet vibrating wire dust removal. Background Art

[0002] Shipping is an important means of cross-border trade. Since shipping vessels emit a large amount of sulfides, their exhaust gases have a negative impact on coastal communities and marine ecosystems. With the rapid development of the shipping industry and the strengthening of global environmental awareness, the International Maritime Organization has formulated strict regulations, and ships must meet sulfur content requirements and PM control requirements during navigation. Currently, traditional ship desulfurization technologies are mainly divided into open seawater method, closed alkali liquor method and hybrid system. The open desulfurization tower uses the acid-base buffering ability and the ability to neutralize acidic gases of seawater to remove sulfur oxides in the flue gas. In the closed desulfurization tower, seawater does not act as a washing liquid to react with the flue gas, but only as a cooling water to cool the washing water. The main desulfurization towers used in mainstream ships are type I desulfurization towers and U-shaped desulfurization towers. The existing U-shaped desulfurization towers have a relatively high tower body and a large volume. In order to improve the desulfurization effect during design, most of them are provided with multiple spray layers to spray alkali liquor, which increases the load of the water pump. Most of the alkali liquor falls into the tower bottom without sufficient contact, and the reaction washing liquid is mostly alkaline and contains some unreacted alkali liquor, resulting in a large waste of alkali liquor. Moreover, most of the existing U-shaped towers use a Venturi dust collector as a secondary tower, which has problems such as large pressure drop and more slurry waste. Summary of the Invention

[0003] The purpose of the present invention is to provide an improved ship desulfurization system based on wet vibrating wire dust removal, which realizes the improvement of energy-saving effect while ensuring the emission effect, and effectively saves the precious space and electric energy of the ship.

[0004] The technical solution adopted by the present invention is as follows: An improved ship desulfurization system based on wet vibrating wire dust removal, comprising a fan, a vibrating wire dust removal device, a desulfurization tower and a smoke exhaust passage. The air outlet of the fan is connected to the air inlet of the desulfurization tower through a pipeline via the vibrating wire dust removal device, and the top air outlet of the desulfurization tower is connected to the smoke exhaust passage; The vibrating wire dust removal device is a wet vibrating wire dust removal device. In the desulfurization tower, a spray layer and a three-phase rectifier reactor are arranged in sequence from top to bottom, and the air inlet of the desulfurization tower is arranged below the three-phase rectifier reactor.

[0005] Preferably, a roof demister is further provided in the desulfurization tower. The roof demister is arranged above the spray layer and is used for upward spraying.

[0006] Preferably, pressure sensors are provided on the upper and lower surfaces of the three-phase rectifier reactor; A pressure sensor is provided in the vibrating wire dust removal device.

[0007] Preferably, the vibrating wire dust removal device is a wet vibrating wire dust removal device. The vibrating wire dust removal device includes a housing, and a nozzle, a vibrating wire, and a dust collection box arranged inside the housing. The nozzle is arranged on one side of the inclined vibrating wire, and the dust collection box is arranged below the vibrating wire.

[0008] Preferably, a baffle is provided at the top of the dust collection box. The baffle is arranged obliquely downward. A dust collection box inlet is provided at the lower position of the obliquely downward baffle. The baffle is used to guide the liquid to the lower dust collection box inlet, and a diversion plate is provided above the dust collection box inlet.

[0009] Preferably, the bottom of the vibrating wire dust removal device is sequentially connected with a storage tank and a washing liquid tank through a transportation pipe. The inlet of the washing liquid tank is connected to the bottom of the desulfurization tower through a pipeline via an electromagnetic valve.

[0010] Preferably, a seawater heat exchanger is provided in the washing liquid tank.

[0011] Preferably, the improved ship desulfurization system based on wet vibrating wire dust removal further includes a mixing tank. The output port of the mixing tank is connected to the nozzle inside the vibrating wire dust removal device and the spray layer inside the desulfurization tower through a spray pipe via a water pump respectively; The inlet of the mixing tank is connected with a NaOH tank, and another inlet of the mixing tank is connected with the washing liquid tank.

[0012] Preferably, pH sensors are provided at the connection ports of the mixing tank with the NaOH tank, the washing liquid tank, the nozzle, and the spray layer respectively. Electromagnetic valves are also provided at the connection ports of the mixing tank with the NaOH tank and the washing liquid tank.

[0013] Preferably, the outlet of the storage tank is connected to the inlet of the washing liquid tank through a pipeline via a water pump; The reflux outlet of the washing liquid tank is connected to the reflux inlet of the storage tank through a pipeline. The beneficial effects of the present invention are as follows: By jointly using the vibrating wire dust removal device and the three-phase rectifier reactor, the present invention effectively improves the desulfurization efficiency, reduces the number of spray layers, and effectively reduces the space occupied by the spraying of the spray layer and the pressure provided by the water pump to the nozzles. Furthermore, the volume of the desulfurization tower and the power of the water pump are reduced, achieving the improvement of the energy-saving effect while ensuring the emission effect and effectively saving the precious space and electric energy of the ship. Description of the Drawings

[0014] Figure 1 is a schematic diagram of the principle of the improved ship desulfurization system based on wet vibrating wire dust removal in an embodiment of the present invention.

[0015] Figure 2 is a schematic diagram of the structure of the three-phase rectifier reactor in an embodiment of the present invention.

[0016] Figure 3 is Figure 2Cross-sectional view A-A

[0017] Figure 4 is the front view of the vibrating string in the embodiment of the present invention.

[0018] Figure 5 is the perspective view of the vibrating string in the embodiment of the present invention.

[0019] Figure 6 is the structural schematic diagram of the vibrating string dust removal device in the embodiment of the present invention.

[0020] Figure 7 is Figure 6 Cross-sectional view A-A

[0021] In the figure: 1 - fan; 2 - vibrating string dust removal device; 3 - three-phase rectifier reactor; 4 - spray layer; 5 - ridge demister; 6 - storage tank; 7 - NaOH tank; 8 - mixing tank; 9 - washing liquid tank; 10 - smoke exhaust duct; 11 - liquid film; 12 - seawater heat exchanger; 13 - pressure sensor; 14 - desulfurization tower; 15 - PH sensor; 16 - vibrating string; 17 - steel string; 18 - nozzle; 19 - baffle; 20 - spray pipe; 21 - dust collection box; 22 - transport pipe; 23 - deflector. Detailed implementation manners

[0022] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] In the description of the present invention, it should be understood that if there are terms involved such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Example 1 An improved ship desulfurization system based on wet vibrating wire dust removal, such as Figures 1-3 As shown, it includes a fan 1, a vibrating string dust removal device 2, a desulfurization tower 14 and a smoke exhaust channel 10. The air outlet of the fan 1 is connected to the air inlet of the desulfurization tower 14 through a pipeline via the vibrating string dust removal device 2, and the top air outlet of the desulfurization tower 14 is connected to the smoke exhaust channel 10; The vibrating-wire dust removal device 2 is a wet vibrating-wire dust removal device. A spray layer 4 and a three-phase rectifying reactor 3 are arranged in sequence from top to bottom in the desulfurization tower 14 . The air inlet of the desulfurization tower 14 is arranged below the three-phase rectifying reactor 3 .

[0026] Furthermore, a ridge demister 5 is provided in the desulfurization tower 14 , and the ridge demister 5 is arranged above the spray layer 4 for spraying upward.

[0027] Furthermore, pressure sensors 13 are provided on the upper and lower surfaces of the three-phase rectifying reactor 3; A pressure sensor 13 is provided in the vibrating wire dust removal device 2 .

[0028] Example 2 like Figures 4-7 As shown, the vibrating wire dust removal device is further limited on the basis of Example 1, and the performance of Example 2 after the limitation is better.

[0029] The vibrating wire dust removal device 2 includes a shell, and a nozzle 18, a vibrating wire 16, and a dust collecting box 21 arranged in the shell. The nozzle is arranged on one side of the inclined vibrating wire 16, and the dust collecting box 21 is arranged below the vibrating wire 16.

[0030] Furthermore, a baffle 19 is provided on the top of the dust box 21, and the baffle 19 is arranged obliquely downward. The baffle 19 obliquely downward is provided with an inlet of the dust box 21 at a low position. The baffle 19 is used to guide the liquid to the inlet of the dust box 21, and a guide plate 23 is provided above the inlet of the dust box 21.

[0031] Furthermore, a dust collection box 21 is provided in the vibrating wire dust removal device 2 for collecting the dust particles captured by the dust collector. At the same time, a transport pipe 22 is provided under the dust collection box for transporting the reaction slurry and particulate matter. The transport pipe 22 is connected to a storage tank 6. The water separated by precipitation in the storage tank 6 is pumped back to the washing liquid tank 9 by a working medium pump, effectively avoiding the waste of the slurry.

[0032] The wet vibrating wire dust removal device 2 is connected to the fan 1 and is located before the desulfurization tower 14. The diameter of the wire is about 0.35 mm, the wire spacing is 2 - 5 mm, and the steel wire of the vibrating wire is made of 2205 material. The vibrating wire forms an angle of 5° with the vertical direction, which is convenient for the attachment of liquid droplets and the automatic detachment of contaminated particulate matter. Dust is captured by forming a mist droplet group through the nozzle 18, and the mist droplets collide with the surface of the vibrating wire to form a dynamic water film barrier.

[0033] Furthermore, the bottom of the vibrating wire dust removal device 2 is sequentially connected to a storage tank 6 and a washing liquid tank 9 through a transport pipe 22. The inlet of the washing liquid tank 9 is connected to the bottom of the desulfurization tower 14 through a pipeline via an electromagnetic valve.

[0034] Furthermore, a seawater heat exchanger 12 is provided in the washing liquid tank 9.

[0035] Furthermore, the improved ship desulfurization system based on wet vibrating wire dust removal further includes a mixing tank 8. The output port of the mixing tank 8 is respectively connected to the nozzle 18 in the vibrating wire dust removal device 2 and the spray layer 4 in the desulfurization tower 14 through a spray pipe 20 via a water pump. The inlet of the mixing tank 8 is connected to a NaOH tank 7, and another inlet of the mixing tank 8 is connected to the washing liquid tank 9.

[0036] Furthermore, electromagnetic valves are provided on the pipelines between the water pump and the nozzle 18 and between the water pump and the spray layer 4.

[0037] Furthermore, pH sensors are provided at the connection ports of the mixing tank 8 with the NaOH tank 7, the washing liquid tank 9, the nozzle 18, and the spray layer 4 respectively. Electromagnetic valves are also provided at the connection ports of the mixing tank 8 with the NaOH tank 7 and the washing liquid tank 9 respectively.

[0038] Furthermore, the outlet of the storage tank 6 is connected to the inlet of the washing liquid tank 9 through a pipeline via a water pump. The reflux outlet of the washing liquid tank 9 is connected to the reflux inlet of the storage tank 6 through a pipeline.

[0039] The working principle of the present invention: The described wet vibrating wire dust removal device 2 is connected to the fan 1 and is located before the desulfurization tower 14. The wire diameter is about 0.35 mm, the wire spacing is 2 - 5 mm, and the steel wire is made of 2205 material. The vibrating wire forms an angle of 5° with the vertical direction, which is convenient for the attachment of liquid droplets and the automatic detachment of contaminated particulate matter. Dust is captured by spraying through the nozzle 18 to form a mist droplet group, and the mist droplets collide with the surface of the vibrating wire to form a dynamic water film barrier. When the dust-containing gas flow passes through the water film, the dust is captured by the water film due to inertial collision and interception effects. The hydrophobic surface enhances the liquid holding capacity, and the water film is continuously updated to avoid blockage, so that most of the particulate matter in the flue gas to be treated is adsorbed and removed before entering the desulfurization tower 14. At the same time, since the flue gas flows through the steel wire, the steel wire vibrates, and the liquid droplets attached to the wire are also bounced off and become finer, enhancing the adsorption effect between the solid and the liquid, significantly improving the dust removal efficiency, and also making up for the problem of single function of traditional liquid film dust removal, effectively avoiding the accumulation of ash at the inlet of the desulfurization tower 14. At the same time, due to the existence of the vibrating wire dust removal device 2, the content of particulate matter in the flue gas entering the desulfurization tower 14 is greatly reduced, thereby also avoiding the reduction of the efficiency of the desulfurization tower 14 and the increase of the load of the fan 1 caused by the blockage of a large amount of particulate matter in the three-phase rectifier reactor. A dust collection box 21 is provided in the vibrating wire dust removal device 2 to collect the dust particles captured by the dust collector. At the same time, a transport pipe 22 is provided under the dust collection box for transporting the reaction slurry and particulate matter. The transport pipe 22 is connected to the storage tank 6. The water separated by precipitation in the storage tank 6 is pumped back to the washing liquid tank 9 by the working medium pump, effectively avoiding the waste of the slurry.

[0040] The described three-phase rectifier reactor 3 is located below the spray layer 4. The slurry sprayed by the spray layer 4 falls onto the three-phase rectifier reactor. The three-phase rectifier reactor is a porous structure. Due to the existence of liquid tension, the liquid droplets of the slurry form a liquid film 11 with a relatively low thickness on the three-phase rectifier reactor 3, enhancing the reaction efficiency of the gas-liquid-solid three states.

[0041] The described pressure sensors 13 are respectively arranged on both sides of the wet vibrating wire dust removal device 2 and the three-phase rectifier reactor 3 to monitor the internal pressure conditions. When a large amount of blockage occurs in the three-phase rectifier reactor 3 or the wet vibrating wire dust removal device 2, the pressure difference between the two sides becomes abnormally large, and the water pressure of the corresponding sprayer is adjusted to achieve the automatic cleaning of the device.

[0042] The described seawater heat exchanger 12 is placed in the washing liquid tank 9. By using the cooling seawater of the ship's jacket cooling water for circulation, the cooling of the washing liquid after the reaction is realized, effectively avoiding the water pressure required for secondary pumping of seawater and effectively reducing the power of the ship's original cooling seawater pump.

[0043] The described pH sensor 15 is placed at the three pipe ports of the mixing tank 8. By measuring the pH of the concentrated solution and the dilute solution entering the inlet, it determines whether to mix and the opening degrees of the two valves during the mixing process.

[0044] In summary, (1) the combined use of the vibrating wire dust removal and the three-phase rectifier reactor in the present invention effectively reduces the space occupied by the spraying of the spraying layer and the pressure provided by the water pump to the nozzle, thereby reducing the volume of the desulfurization tower and the power of the water pump, and effectively saving the precious space and electric energy of the ship. (2) The present invention is equipped with pressure and pH monitoring modules, capable of monitoring the operation status of the desulfurization system in real time all-weather, and the self-cleaning design effectively reduces the work burden of the crew. (3) The wet vibrating wire dust removal method proposed in the present invention replaces the venturi tube dust removal of the existing U-shaped desulfurization tower of ships, effectively reducing the pressure drop of gas flow and the load of the system fan. The present invention proposes to use the cooling seawater of the ship's cylinder jacket cooling system to cool the washing liquid, which can avoid the sub-pumping of seawater caused by cooling the slurry.

[0045] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0046] It should be understood that those of ordinary skill in the art can make improvements or transformations according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of the present invention.

Claims

1. An improved ship desulfurization system based on wet vibrating wire dust removal, characterized in that: It comprises a fan (1), a vibrating string dust removal device (2), a desulfurization tower (14) and a smoke exhaust passage (10), wherein the air outlet of the fan (1) is connected to the air inlet of the desulfurization tower (14) through a pipeline via the vibrating string dust removal device (2), and the air outlet of the desulfurization tower (14) is connected to the smoke exhaust passage (10); The vibrating-wire dust removal device (2) is a wet vibrating-wire dust removal device, and a spray layer (4) and a three-phase rectifying reactor (3) are arranged in sequence from top to bottom in the desulfurization tower (14).

2. The improved ship desulfurization system based on wet vibrating wire dust removal according to claim 1 is characterized in that: A ridge demister (5) is also provided in the desulfurization tower (14). The ridge demister (5) is arranged above the spray layer (4) and is used for spraying upward.

3. The improved ship desulfurization system based on wet vibrating wire dust removal according to claim 1 is characterized in that: Pressure sensors (13) are provided on the upper and lower surfaces of the three-phase rectifying reactor (3); A pressure sensor (13) is provided in the vibrating wire dust removal device (2).

4. The improved ship desulfurization system based on wet vibrating wire dust removal according to claim 1 is characterized in that: The vibrating wire dust removal device (2) comprises a housing, and a nozzle (18), a vibrating wire (16), and a dust collection box (21) arranged inside the housing, wherein the nozzle is arranged on one side of the inclined vibrating wire (16), and the dust collection box (21) is arranged below the vibrating wire (16).

5. The improved ship desulfurization system based on wet vibrating wire dust removal according to claim 4 is characterized in that: A baffle (19) is provided on the top of the dust collecting box (21). The baffle (19) is arranged obliquely downward. An inlet of the dust collecting box (21) is provided at a lower position of the obliquely downward baffle (19). A guide plate (23) is provided above the inlet of the dust collecting box (21).

6. The improved ship desulfurization system based on wet vibrating wire dust removal according to claim 1 is characterized in that: The bottom of the vibrating wire dust removal device (2) is connected in sequence to a storage tank (6) and a washing liquid tank (9) via a transport pipe (22), and the inlet of the washing liquid tank (9) is connected to the bottom of the desulfurization tower (14) via a pipeline.

7. The improved ship desulfurization system based on wet vibrating wire dust removal according to claim 6 is characterized in that: A seawater heat exchanger (12) is provided in the washing liquid tank (9).

8. The improved ship desulfurization system based on wet vibrating wire dust removal according to claim 6 is characterized in that: The improved ship desulfurization system based on wet vibrating wire dust removal further comprises a mixing tank (8), the output port of the mixing tank (8) being connected to a nozzle (18) in the vibrating wire dust removal device (2) and a spray layer (4) in the desulfurization tower (14) via a spray pipe (20) and a water pump respectively; The mixing tank (8) is connected to the NaOH tank (7), and the mixing tank (8) is connected to the washing liquid tank (9).

9. The improved ship desulfurization system based on wet vibrating wire dust removal according to claim 8 is characterized in that: A pH sensor is provided at the connection ports of the mixing tank (8) with the NaOH tank (7), the washing liquid tank (9), the nozzle (18) and the spray layer (4), and a valve is also provided at the connection ports of the mixing tank (8) with the NaOH tank (7) and the washing liquid tank (9).

10. The improved ship desulfurization system based on wet vibrating wire dust removal according to claim 6, characterized in that: The outlet of the storage tank (6) is connected to the inlet of the washing liquid tank (9) via a pipeline through a water pump; The reflux outlet of the washing liquid tank (9) is connected to the reflux inlet of the storage tank (6) via a pipeline.

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