阅读说明：本技术 一种船舶烟气净化与海水淡化复合系统 (Ship flue gas purification and seawater desalination composite system ) 是由 何宏舟 郑剑铭 张军 侯懿宁 于 2020-04-28 设计创作，主要内容包括：本发明提供一种船舶烟气净化与海水淡化复合系统,涉及烟气净化领域。本发明的复合系统包括脱硫塔、换热器、浓海水蓄水箱和淡水蓄水箱。换热器上设置海水淡化装置。海水淡化装置具有换热壁、冷凝壁、海水喷淋管路和淡水收集槽和浓海水收集槽。烟气依次进入换热器和脱硫塔。海水喷淋管路喷淋海水在换热壁上,吸收换热壁另一面传递的高温烟气热量,蒸发并在冷凝壁冷凝落入淡水收集槽,未蒸发的海水落入浓海水收集槽。淡水收集槽连通于淡水蓄水箱。浓海水收集槽连通于浓海水蓄水箱。实现海水淡化,获得淡水。脱硫塔设有烟气烟气净化装置,浓海水蓄水箱连通于烟气净化装置,用以喷淋浓海水对烟气进行脱硫。烟气经过脱硫、洗涤、除雾后排至大气中。(The invention provides a ship flue gas purification and seawater desalination composite system, and relates to the field of flue gas purification. The composite system comprises a desulfurizing tower, a heat exchanger, a concentrated seawater water storage tank and a fresh water storage tank. The heat exchanger is provided with a seawater desalination device. The seawater desalination device is provided with a heat exchange wall, a condensation wall, a seawater spraying pipeline, a fresh water collecting tank and a concentrated seawater collecting tank. The flue gas enters the heat exchanger and the desulfurizing tower in sequence. The seawater spraying pipeline sprays seawater on the heat exchange wall, absorbs high-temperature flue gas heat transmitted by the other surface of the heat exchange wall, evaporates and condenses on the condensation wall to fall into the fresh water collecting tank, and the unevaporated seawater falls into the concentrated seawater collecting tank. The fresh water collecting tank is communicated with the fresh water storage tank. The concentrated seawater collecting tank is communicated with a concentrated seawater water storage tank. The seawater desalination is realized, and fresh water is obtained. The desulfurizing tower is provided with a flue gas and flue gas purifying device, and the concentrated seawater water storage tank is communicated with the flue gas purifying device and is used for spraying concentrated seawater to desulfurize the flue gas. The flue gas is discharged into the atmosphere after being desulfurized, washed and demisted.)

1. A ship flue gas purification and seawater desalination composite system is characterized by comprising a desulfurizing tower (1), a heat exchanger (2), a concentrated seawater water storage tank (3) and a fresh water storage tank (4);

a flue gas channel is arranged in the heat exchanger (2), and a flue gas primary air inlet (21) and a flue gas primary air outlet (22) are respectively arranged at two ends of the flue gas channel; the heat exchanger (2) is provided with a seawater desalination device; the seawater desalination device is provided with a heat exchange wall (241), a condensation wall (242), a seawater desalination flash chamber (23), a fresh water collecting tank (251) and a concentrated seawater collecting tank (261); the inner side surface of the heat exchange wall (241) is encircled to form the flue gas channel, the outer side surface of the heat exchange wall (241) is a heat exchange surface, the inner side surface of the condensation wall (242) is a condensation surface, and the seawater desalination flash evaporation chamber (23) is formed between the heat exchange surface and the condensation surface; the fresh water collecting tank (251) is arranged below the condensing surface; the concentrated seawater collecting tank (261) is arranged below the heat exchange surface; the fresh water collecting tank (251) is provided with a fresh water outlet (252); the concentrated seawater collecting tank (261) is provided with a first concentrated seawater outlet (262);

the fresh water outlet (252) is connected to the fresh water storage tank (4); the first concentrated seawater outlet (262) is connected to the concentrated seawater water storage tank (3);

the desulfurizing tower (1) is provided with a secondary flue gas inlet (130), a flue gas purifying device and a secondary flue gas outlet (140); the smoke primary exhaust port (22) is connected to the smoke secondary air inlet (130); the flue gas discharged from the flue gas primary exhaust port (22) enters the flue gas secondary air inlet (130), is purified by the flue gas purification device and then is discharged from the flue gas secondary exhaust port (140);

the concentrated seawater water storage tank (3) is connected to the flue gas purification device and used for spraying concentrated seawater to purify flue gas.

2. The combined system of ship flue gas purification and seawater desalination as claimed in claim 1, wherein: a plurality of groups of the heat exchangers (2) are arranged.

3. The combined system of ship flue gas purification and seawater desalination as claimed in claim 1, wherein: the desulfurization tower (1) is provided with a tower shell (11), and a slurry area (12), an air inlet area (13), a desulfurization area (16), a washing area (17), a demisting area (18) and a flue gas discharge area (14) which are arranged in the tower shell (11) from bottom to top in sequence;

the secondary flue gas inlet (130) is formed in the side wall of the gas inlet area (13);

the concentrated seawater water storage tank (3) is connected to the desulfurization area (16).

4. The combined system of ship flue gas purification and seawater desalination as claimed in claim 3, wherein: the washing area (17) is provided with a plurality of spray heads for spraying seawater downwards.

5. The combined system of ship flue gas purification and seawater desalination as claimed in claim 3, wherein: the demisting area (18) is provided with a bent condensation pipeline for condensing and refluxing water vapor on the pipe wall of the condensation pipeline.

6. The combined system of ship flue gas purification and seawater desalination as claimed in claim 3, wherein: a pneumatic emulsification desulfurization cylinder (160) is arranged in the desulfurization zone (16); the inner cavity of the pneumatic emulsification desulfurization cylinder (160) is provided with a turbulator (161) and a second atomizing nozzle (162) positioned above the turbulator (161); the second atomization nozzle (162) is connected with the concentrated seawater water storage tank (3) through a pipeline and is used for atomizing concentrated seawater so as to carry out desulfurization treatment on the flue gas entering the turbulator (161); and the flue gas in the gas inlet area (13) enters the washing area (17) after being desulfurized by the pneumatic emulsification desulfurization cylinder (160).

7. The combined system of ship flue gas purification and seawater desalination as claimed in claim 6, wherein: the desulfurization area (16) is provided with two layers of clapboards (15), a plurality of pneumatic emulsification desulfurization cylinders (160) are welded between the two layers of clapboards (15), and holes are formed in the upper end and the lower end of each clapboard (15) at the corresponding position of each pneumatic emulsification desulfurization cylinder (160); an adjusting handle for adjusting the opening degree of the fan blades of the turbulator (161) is arranged outside the turbulator (161) to adapt to the smoke working conditions under different use conditions.

8. The combined system of ship flue gas purification and seawater desalination as claimed in claim 6, wherein: a plurality of turbulators (161) are arranged in the pneumatic emulsification desulfurization cylinder (160), and a second atomizing nozzle (162) is correspondingly arranged above each turbulator (161).

9. The combined system of ship flue gas purification and seawater desalination as claimed in claim 1, wherein: the seawater desalination device also comprises a seawater draft tube (232) embedded in the condensation wall (242), a connecting tube (234) and a first atomizing nozzle (235);

one end of the connecting pipe (234) is communicated with the opening on the side wall of the seawater draft tube (232), and the other end of the connecting pipe extends to the seawater desalination flash chamber (23) and is communicated with the first atomizing nozzle (235); and a second concentrated seawater outlet (233) at the tail end of the seawater diversion pipe (232) is communicated with the concentrated seawater water storage tank (3).

10. The combined system of ship flue gas purification and seawater desalination as claimed in claim 9, wherein: the seawater flow guide pipe (232) is of a spiral annular structure, 6-8 first atomizing nozzles (235) are arranged on each ring, and the first atomizing nozzles (235) on two adjacent rings are arranged in a staggered mode; the end of the first atomizing nozzle (235) exceeds the outer edge of the fresh water collecting tank (251).

Technical Field

The invention relates to the field of flue gas purification, in particular to a ship flue gas purification and seawater desalination combined system.

Background

Today, the market share occupied by ocean-going transportation is increasing year by year as the world's cargo transportation is increasingly busy, and the discharge of pollutants generated by ship power plants places a tremendous burden on the marine atmospheric environment. In consideration of economic benefit, the ocean vessel mostly selects the heavy fuel oil with 4.5 percent of sulfur content, and in order to achieve the emission standard equivalent to the tail gas generated by burning the heavy oil with 0.1 percent of sulfur content, the flue gas purification system of the ocean vessel must achieve the purification efficiency of 97.78 percent. In the face of increasingly severe restriction of MARPOL73/78 convention, domestic research on ship tail gas purification treatment is still in a starting stage, most of the research is carried out on the basis of the existing industrial flue gas desulfurization and denitrification technology, and the equipment generally has the problems of complex structure, large investment, high energy consumption, large occupied area and the like.

The ship tail gas desulfurization technologies developed in recent years are wet desulfurization technologies such as a seawater method, a magnesium-based method, a calcium-based method and a sodium-based method. Among them, the seawater desulfurization method is considered to be one of the more promising methods for treating the ship tail gas because of its advantages of simple process flow, locally available materials, high economy and reliability, less pollution to the ecological environment, and the like. However, the existing seawater desulfurization method has the problems of large equipment occupation space, low desulfurization efficiency in low salinity sea areas and the like when the tail gas discharged by combustion of high-sulfur heavy oil fuel is treated.

In addition, the available area, space and load carrying capacity for ocean-going transport vessels, whether cargo or passenger, as a transport platform on the sea is limited. If the fresh water used on the ship is carried by the ship or supplied along the shore, the fresh water storage tank required by the ship occupies a large amount of used space of the ocean vessel, and the carrying capacity and the economy of the ship are reduced; at present, a plurality of ocean transport ships are also provided with special seawater desalination devices on own ships to solve the problem of offshore water consumption, and the general desalination devices have large systems, so that the seawater desalination energy consumption is high, the cost is high, and the carrying capacity and the economical efficiency of the ships can be reduced.

Disclosure of Invention

The high-efficiency clean ship flue gas purification is combined with the research and development of a seawater desalination system, is a research hotspot of the current ship flue gas purification, and is also a key core technology for realizing the high-efficiency transportation of ships. The invention aims to solve the problems of large occupied space of the ship desulfurization equipment and high seawater desalination cost. Therefore, the invention adopts the following technical scheme.

The invention provides a ship flue gas purification and seawater desalination composite system, which comprises a desulfurization tower, a heat exchanger, a concentrated seawater water storage tank and a fresh water storage tank, wherein the desulfurization tower is arranged on the top of the seawater storage tank;

a smoke channel is arranged in the heat exchanger, and a smoke primary air inlet and a smoke primary air outlet are respectively arranged at two ends of the smoke channel; the heat exchanger is provided with a seawater desalination device; the seawater desalination device is provided with a heat exchange wall, a condensation wall, a seawater desalination flash evaporation chamber, a fresh water collecting tank and a concentrated seawater collecting tank; the inner side surface of the heat exchange wall is enclosed to form the flue gas channel, the outer side surface of the heat exchange wall is a heat exchange surface, the inner side surface of the condensation wall is a condensation surface, and the seawater desalination flash evaporation chamber is formed between the heat exchange surface and the condensation surface; the fresh water collecting tank is arranged below the condensing surface; the concentrated seawater collecting tank is arranged below the heat exchange surface; the fresh water collecting tank is provided with a fresh water outlet; the concentrated seawater collecting tank is provided with a first concentrated seawater outlet;

the fresh water outlet is connected with the fresh water storage tank; the first concentrated seawater outlet is connected to the concentrated seawater water storage tank;

the desulfurizing tower is provided with a flue gas secondary air inlet, a flue gas purifying device and a flue gas secondary exhaust port; the smoke primary exhaust port is connected with the smoke secondary air inlet; the flue gas discharged from the flue gas primary exhaust port enters the flue gas secondary air inlet, is purified by the flue gas purification device and then is discharged from the flue gas secondary exhaust port;

the concentrated seawater water storage tank is connected to the flue gas purification device and used for spraying concentrated seawater to purify flue gas.

Furthermore, the ship flue gas purification and seawater desalination compound system is provided with a plurality of groups of heat exchangers.

Furthermore, the desulfurization tower is provided with a tower shell, and a slurry area, an air inlet area, a desulfurization area, a washing area, a demisting area and a flue gas discharge area which are sequentially arranged in the tower shell from bottom to top; the secondary flue gas inlet is formed in the side wall of the gas inlet area; the concentrated seawater water storage tank is connected to the desulfurization area.

Further, a plurality of spray heads are installed in the washing area and used for spraying seawater downwards.

Further, the demisting area is provided with a bent condensation pipeline for condensing and refluxing water vapor on the pipe wall of the condensation pipeline.

Further, a pneumatic emulsification desulfurization cylinder is arranged in the desulfurization zone; the inner cavity of the pneumatic emulsification desulfurization cylinder is provided with a turbulator and a second atomizing nozzle positioned above the turbulator; the second atomizing nozzle is connected with the concentrated seawater water storage tank through a pipeline and is used for atomizing concentrated seawater so as to desulfurize the flue gas entering the turbulator; and the flue gas in the gas inlet area enters the washing area after being desulfurized by the pneumatic emulsification desulfurization cylinder.

Furthermore, the desulfurization area is provided with two layers of partition plates, a plurality of pneumatic emulsification desulfurization cylinders are welded between the two layers of partition plates, and the partition plates are provided with holes at the upper end and the lower end of the corresponding part of each pneumatic emulsification desulfurization cylinder; the outer part of the turbulator is provided with an adjusting handle for adjusting the opening degree of the fan blades of the turbulator so as to adapt to the smoke working conditions under different use conditions.

Furthermore, a plurality of turbulators are arranged in the pneumatic emulsification desulfurization cylinder, and a second atomizing nozzle is correspondingly arranged above each turbulator.

Furthermore, the seawater desalination device also comprises a seawater draft tube embedded in the condensation wall, a connecting pipe and a first atomizing nozzle; one end of the connecting pipe is communicated with the opening on the side wall of the seawater draft tube, and the other end of the connecting pipe extends to the seawater desalination flash chamber and is communicated with the first atomizing nozzle; and a second concentrated seawater outlet at the tail end of the seawater diversion pipe is communicated with the concentrated seawater water storage tank.

Furthermore, the seawater flow guide pipe is of a spiral annular structure, 6-8 first atomizing nozzles are arranged on each ring, and the first atomizing nozzles on two adjacent rings are arranged in a staggered mode; the tail end of the first atomizing nozzle exceeds the outer edge of the fresh water collecting tank.

The invention has the beneficial effects that:

1. the ship flue gas waste heat can be reasonably utilized, the gradient utilization of heat is realized, and the purposes of energy conservation and high efficiency are achieved.

2. The desulfurizer is prepared from local materials, does not need to carry and store the desulfurizer, and is suitable for various sea areas with seawater alkalinity.

3. The desulfurization process has high efficiency and compact equipment structure, and produces fresh water while realizing desulfurization and decontamination, thereby effectively reducing the fresh water reserve on the ship and further increasing the effective load capacity of the ship.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of the overall structure of a combined system for flue gas purification and seawater desalination of a ship provided by the present invention;

FIG. 2 is a schematic diagram of the heat exchanger of FIG. 1;

fig. 3 is a schematic view of the configuration of the desulfurization tower in fig. 1.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, the embodiment provides a combined system for flue gas purification and seawater desalination of a ship, which includes a desulfurizing tower 1, a heat exchanger 2, a concentrated seawater water storage tank 3 and a fresh water storage tank 4.

As shown in fig. 2, a flue gas channel is arranged in the heat exchanger 2, and a flue gas first-stage air inlet 21 and a flue gas first-stage air outlet 22 are respectively arranged at two ends of the flue gas channel. The heat exchanger 2 is provided with a seawater desalination device. The seawater desalination device comprises a heat exchange wall 241, a condensation wall 242, a seawater desalination flash chamber 23, a fresh water collection tank 251 and a concentrated seawater collection tank 261. The inner side of the heat exchange wall 241 is enclosed to form a flue gas channel, and the outer side of the heat exchange wall 241 is a heat exchange surface. The inner surface of the condensation wall 242 is a condensation surface. A seawater desalination flash evaporation chamber 23 is formed between the heat exchange surface and the condensation surface. The fresh water collecting tank 251 is disposed below the condensing surface. The concentrated seawater collection tank 261 is disposed below the heat exchange surface.

The fresh water collecting tank 251 is provided with a fresh water outlet 252, and the fresh water outlet 252 is connected with the fresh water storage tank 4. The concentrated seawater collecting tank 261 is provided with a first concentrated seawater outlet 262, and the first concentrated seawater outlet 262 is connected to the concentrated seawater reservoir 3.

The seawater desalination apparatus further comprises a seawater draft tube 232 embedded in the condensation wall 242, a connection tube 234 and a first atomizing nozzle 235.

One end of the connecting pipe 234 is communicated with the opening on the sidewall of the seawater draft tube 232, and the other end extends to the seawater desalination flash chamber 23 and is communicated with the first atomizing nozzle 235. The two ports of the seawater draft tube 232 are respectively a seawater inlet 231 and a second concentrated seawater outlet 233, and the second concentrated seawater outlet 233 is communicated with the concentrated seawater water storage tank 3.

The seawater draft tube 232 is of a spiral annular structure, 6-8 first atomizing nozzles 235 are arranged on each ring, and the first atomizing nozzles 235 on two adjacent rings are arranged in a staggered mode. The end of the first atomizing nozzle 235 exceeds the outer edge of the fresh water collecting tank 251 so as to prevent the sprayed seawater from dripping into the fresh water collecting tank 251. The first atomizing nozzle 235 is preferably an electrostatic atomizing nozzle, i.e., an electrostatic coil is sleeved outside the nozzle, and an insulating protective sleeve is sleeved outside the electrostatic coil. An electric wire trunk is laid along the path outside the seawater diversion pipe 232, each electrostatic coil is connected to the electric wire trunk in parallel through an electric wire, and the electric wire trunk is electrically connected to an external power supply. During spraying, the water mist is charged and easily adsorbed on the heat exchange wall 241 when passing through the electric field in the electrostatic coil. The first atomizing nozzle 235 may be other types of atomizing nozzles than the electrostatic atomizing nozzle, and the present invention is not particularly limited.

Preferably, the combined system for purifying the flue gas of the ship and desalinating the seawater can be provided with a plurality of groups of heat exchangers 2, and the heat energy of the flue gas can be fully utilized by adjusting the diameter and the length of a flue gas channel of the heat exchangers 2. The flue gas enters the plurality of flue gas first-level air inlets 21 from a large inlet in a dispersing way, is discharged from the plurality of flue gas first-level air outlets 22 and is converged into a large pipeline outlet. The plurality of fresh water collecting grooves 251 are communicated with one or more fresh water storage tanks 4; the plurality of concentrated seawater collecting tanks 261 are communicated with one or more concentrated seawater reservoir tanks 3. Thereby obtaining fresh water resources and concentrated seawater.

Preferably, the wall surfaces of the heat exchanger 2 are made of heat exchange materials except the fresh water collecting tank. The heat exchange material is aluminum alloy, has corrosion resistance, and can be made of non-metal materials such as graphite, ceramics and glass and metal materials such as stainless steel, titanium, tantalum and zirconium.

As shown in fig. 3, the desulfurization tower 1 is provided with a flue gas secondary inlet 130, a flue gas purification device, and a flue gas secondary outlet 140. The flue gas primary outlet 22 is connected to the flue gas secondary inlet 130. The flue gas discharged from the flue gas first-stage exhaust port 22 enters the flue gas second-stage air inlet 130, is purified by the flue gas purification device, and is discharged from the flue gas second-stage exhaust port 140.

The desulfurization tower 1 is provided with a tower shell 11, and a slurry area 12, an air inlet area 13, a desulfurization area 16, a washing area 17, a demisting area 18 and a flue gas discharge area 14 which are sequentially arranged in the tower shell 11 from bottom to top. The secondary flue gas inlet 130 is provided in the side wall of the inlet section 13.

A pneumatic emulsification desulfurization drum 160 is disposed within the desulfurization zone 16. The inner cavity of the pneumatic emulsification desulfurization cartridge 160 is provided with a turbulator 161 and a second atomizing nozzle 162 located above the turbulator 161. The second atomizing nozzle 162 is communicated with the concentrated seawater reservoir 3 through a pipeline, and the circulating slurry pump pumps the concentrated seawater to the second atomizing nozzle 162 for atomization and spraying so as to desulfurize the flue gas entering the turbulator 161. The second atomizing nozzle 162 is preferably a swirl atomizing nozzle, and other types of atomizing nozzles may be used, and the present invention is not particularly limited.

In a preferred embodiment, two turbulators 161 are provided in a pneumatic emulsification desulfurization cartridge 160, and a second atomizing nozzle 162 is provided above each turbulator 161. The turbulator 161 includes an inner cylinder, an outer cylinder, fan blades, and a blind plate. The blind plate is fixed on the inner cylinder to block gas and liquid from passing through. The inner cylinder and the outer cylinder are fixedly connected through fan blades. The fan blades are in inclined sheets, and the fan blades are uniformly arranged between the inner barrel and the outer barrel in a ring mode, so that the turbulence effect on the concentrated seawater slurry and the flue gas is caused, and the absorption reaction of the slurry on the flue gas pollutants is accelerated.

The outside of the pneumatic emulsification desulfurization cylinder 160 is provided with an adjusting handle for adjusting the opening degree of the blades of the turbulator 161 so as to adapt to the flue gas working conditions under different use conditions. In other embodiments, one or more than two sets of turbulators 161 and second atomizing nozzles 162 may also be provided within one pneumatic emulsification desulfurization cartridge 160.

The desulfurization area 16 is provided with two layers of clapboards 15, a plurality of pneumatic emulsification desulfurization cylinders 160 are welded between the two layers of clapboards 15, and the upper end and the lower end of each pneumatic emulsification desulfurization cylinder 160 corresponding to the clapboard 15 are provided with holes. The flue gas in the gas inlet zone 13 is desulfurized by the pneumatic emulsification desulfurization cylinder 160 and then enters the washing zone 17.

The scrubbing section 17 is provided with a plurality of nozzles for spraying seawater downwardly to scrub impurities such as residual sulfur and smoke in the flue gas.

The demisting zone 18 is equipped with a curved condensation duct for condensing water vapour back on the walls of the condensation duct.

The flue gas purification device comprises a pneumatic emulsification desulfurization cylinder 160 arranged in the desulfurization zone 16, a plurality of spray nozzles in the washing zone 17 and a curved condensation pipeline in the demisting zone 18.

The concentrated seawater sprayed from the desulfurization zone 16, the seawater sprayed from the scrubbing zone 17, and the condensed water from the demisting zone 18 all fall into the slurry zone 12.

The working flow of the combined system of flue gas purification and seawater desalination of the ship of the present invention is described below.

(1) The combustion tail gas of a ship boiler or an internal combustion engine is introduced into the heat exchanger 2 through the first-level gas inlet 22 of the flue gas, meanwhile, natural seawater is extracted by a seawater pump, is introduced into a seawater guide pipe 232 through a seawater inlet 231 after being pretreated by decontamination and purification and the like, and is sprayed into the seawater desalination flash evaporation chamber 23 through a connecting pipe 234 and a first atomizing nozzle 235, so that water mist is adsorbed onto a heat exchange wall 241 and exchanges heat with high-temperature flue gas introduced into the heat exchanger 2. A part of seawater is heated and evaporated under the effect of the ship flue gas waste heat to become water vapor, and when the water vapor contacts the condensation wall 242 on the seawater draft tube side, the water vapor is condensed into fresh water and then collected into the fresh water header tank 4. Other seawater that fails to be evaporated is collected along the heat exchange wall 241 on the flue gas side to the concentrated seawater reservoir 3. The steam can also heat the natural seawater in the seawater draft tube 232, and the natural seawater can be more effectively evaporated after being preheated. The seawater in the seawater draft tube 232 flows into the concentrated seawater water storage tank 3 through the concentrated seawater outlet 233. The concentration and the dilution of the seawater are realized.

(2) The combustion tail gas of the ship internal combustion engine passing through the heat exchanger 2 is discharged from the primary flue gas exhaust port 22 and then enters the secondary flue gas inlet 130 of the desulfurizing tower 1, and enters the inner cavity of the pneumatic emulsification desulfurizing cylinder 160 through the gas inlet area 13. The concentrated seawater in the concentrated seawater reservoir 3 is sprayed out from the second atomizing nozzle 162 by the circulating slurry pump. Flue gas entering the pneumatic emulsification desulfurization cylinder 160 repeatedly rotates and collides with concentrated seawater particles under the action of the turbulator 161 to form an emulsification reaction layer, and alkaline concentrated seawater can effectively capture pollutants such as particle dust and the like while neutralizing and absorbing acidic gases such as sulfur dioxide and the like in the flue gas of the ship, so that the desulfurization reaction is more complete and complete.

(3) The flue gas after the desulfurization reaction is washed by the natural seawater sprayed by the washing area 17, and then passes through the bent pipeline of the demisting area 18, the flue gas carrying water vapor is cooled and condensed after continuously impacting the channel, condensed water falls back to the slurry area 12, and the flue gas is exhausted into the atmosphere from the flue gas secondary exhaust port 140.

(4) Pollutants and waste liquid generated by desulfurization reaction fall to a slurry area 12 at the bottom of the desulfurization tower 1 along with sprayed seawater droplets, and can be discharged back to the sea after being collected and subjected to insolation and impurity filtering, so that the aims of efficiently purifying tail gas of a ship engine, saving energy and reducing emission are fulfilled.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.