WO2020050477A1 - Wet scrubber for ship, and composite cleaning water spray system inside absorption tower, including same - Google Patents

Abstract

The present invention relates to a wet scrubber system for a ship, and to a wet scrubber for a ship and a composite cleaning water spray system inside an absorption tower, including same, the wet scrubber comprising: an absorption tower having, at the lower part thereof, a suction port through which flue gas is suctioned, having, at the upper part thereof, a discharge port through which the flue gas, from which pollutants have been treated to be absorbed, is discharged after the pollutants included in the flue gas are treated to be absorbed, and having a space in which a cleaning water spray nozzle and packing are provided; a first filler and a second filler, which are provided inside the absorption tower with a vertical gap therebetween so as to sequentially absorb sulfur compounds included in the flue gas passing through the absorption tower; a supply line including a plurality of spray nozzles and a supply pump such that a pipe is connected to the absorption tower so as to enable cleaning water to be supplied/sprayed into the absorption tower; and an inflow prevention part which is provided inside the absorption tower so as to be spaced from the upper part of the suction port, and which is formed in a conical shape having a center upwardly inclined toward the discharge port, so as to prevent the inflow of the cleaning water into the flue gas suction port, wherein the supply line is divided into: a first spray nozzle module having a plurality of spray nozzles, which are connected to a pipe positioned at the upper part of the first packing, so as to spray the cleaning water toward the second packing; a second spray nozzle module having a plurality of spray nozzles, which are connected to two upper and lower rows of pipes positioned at the upper part of the second packing, so as to upwardly spray the cleaning water toward a gas-liquid separator; and a third spray nozzle module having a plurality of spray nozzles, which are connected to a pipe positioned at the upper part of the second packing, so as to downwardly spray the cleaning water toward the second packing, and thus the present invention can drastically increase the contact time and contact opportunity of the flue gas suctioned into the absorption tower and the cleaning water sprayed in the absorption tower, so as to effectively remove sulfur oxides contained in the flue gas, which is suctioned into the absorption tower, of a main engine, a power generator, and a boiler, thereby enabling installation costs and operating costs of the system to be reduced.

Description

Wet scrubber for ships and the complex type washing water injection system inside the absorption tower including the same

The present invention relates to a wet scrubber system for ships, after the flue gas sucked through the suction port at the bottom of the absorption tower passes through the first filling material and the second filling material after passing through the quenching process, it goes up toward the flue gas outlet. In the process, in order to effectively absorb and remove the sulfur compounds contained in the flue gas, the washing water spray method in the upper space of the second filler is a combination of counter-current and counter-current methods. It relates to a method of spraying the washing water inside the absorption tower to which the spraying method is applied.

Recently, problems such as environmental pollution caused by flue gas emitted from ships have been caused, and attention has been focused on an apparatus or a method for treating the problem.

The toxic substances contained in the flue gas discharged from ships are not only harmful to the human body, but also cause environmental pollution when discharged into the atmosphere without filtration, especially sulfur compounds (sulfur oxides) contained in flue gas. The oxide of sulfur (S) is collectively called, but mainly SO₂ (sulfur dioxide) and SO₃ (sulfur trioxide) are both produced when fuel containing sulfur or sulfur is burned, but in general, there are many SO₂ in the exhaust gas. It must be removed.

Meanwhile, the International Maritime Organization (IMO) has restricted the fuel sulfur content of ships by the Marine Pollution Treaty (MARPOL), and since 2015, all Emission Control Areas (ECAs) ) It is regulated to use less than 0.1% sulfur-containing fuel in the sea area.

In addition, for ships that use more than 0.1% sulfur-containing fuel due to problems such as fuel costs, the installation of sulfur compound abatement devices has been legally mandated since 2015. That is, a desulfurization treatment process that lowers the content of the sulfur compound contained in the flue gas to an allowable concentration is absolutely necessary, and it is mandatory to discharge only flue gas that has undergone such treatment into the atmosphere.

Accordingly, various types of flue gas treatment devices are installed in the flue gas line of the vessel to desulfurize the ship flue gas and discharge it into the atmosphere.

A wet scrubber system for ships is used to treat such flue gas.

Korean Registered Patent No. 10-1804418 sprays washing water onto flue gas containing contaminants, and dissolves the contaminants of flue gas by contacting the contaminants with droplets, liquid films, and bubbles generated therefrom, or It relates to a wet scrubber system for collecting vessels.

The wet scrubber system for ships is an absorption tower that absorbs and treats pollutants of flue gas by spraying washing water, a washing water treatment system that processes the washing water discharged after absorbing pollutants, and each system while operating the scrubber system. It consists of three parts: a control system that monitors and controls functions.

In the above configuration, the absorption tower is a core device of a wet scrubber system, and there are various types, in particular, a packing material is installed inside the absorption tower so that the pollutants of flue gas are absorbed in the washing water sprayed on the filling material, Alternatively, a method of removing pollutants from the flue gas by spraying the washing water directly into the flue gas is used.

However, in order to effectively remove the sulfur compounds contained in the flue gas of the main pipe, the generator, and the boiler sucked inside the absorption tower, the contact time and contact chance of the flue gas sucked inside the absorption tower and the washing water sprayed inside the absorption tower are further improved. An improved approach is needed to expand.

In order to solve the above problems, the present invention applies a new washing water spraying method to spray washing water in both upper and lower directions by dividing and disposing the washing water spray nozzle module installed in the upper space of the second filler into upper and lower portions. . Through this, the washing water sprayed downward from the upper nozzle and the washing water sprayed upward from the lower nozzle collide, and in this process, the agglomeration phenomenon of the washing water droplets disappears, and it is finely split and scattered. As a result, the opportunity for contact between the washing water droplets and the flue gas is expanded, and based on this, the removal efficiency of the sulfur compound in the washing water can be further improved. Accordingly, an object of the present invention is to provide a wet scrubber for a ship which has improved the efficiency of removing sulfur compounds from a ship exhaust gas and a complex type washing water injection system including an absorption tower.

In order to achieve the above object, the present invention is provided with an intake port through which the flue gas is sucked, and after the pollutants contained in the flue gas are absorbed, the exhaust gas from which the pollutants are absorbed is discharged. Is provided on the upper, and the absorption tower has a pollutant absorption space therein; A first filler and a second filler which are installed at intervals of upper / lower in the absorption tower to sequentially absorb sulfur compounds contained in flue gas passing through the absorption tower; A supply line connected to the absorption tower and including a plurality of injection nozzles and a supply pump to supply / inject cleaning water into the absorption tower; It is installed in the interior of the absorption tower and the upper portion of the suction port, the center is formed in a conical shape inclined upward to include an inflow prevention portion to prevent the inflow of cleaning water to the suction port, the supply line of the first filler A first injection nozzle module connected to a pipe located at an upper portion and having a plurality of injection nozzles for spraying cleaning water upward toward the second filler; A second injection nozzle module having a plurality of spray nozzles which are connected to the upper and lower rows of the piping located above the second filler to spray cleaning water upward toward the gas-liquid separator; A third injection nozzle module having a plurality of injection nozzles connected to a pipe located above the second filler and spraying downward toward the second filler; It is connected to the pipe located at the bottom of the inflow prevention part, and is divided into a cooling injection nozzle module having a plurality of injection nozzles that spray upward cooling water to cool the flue gas sucked into the absorption tower. Provided is a wet scrubber for a vessel, and a complex type washing water injection system inside the absorption tower including the same.

And, between the outlet and the first injection nozzle module further comprises a gas-liquid separation device for inducing rotation in the flow of gas in a linear direction to separate gas and liquid by using centrifugal force to discharge only gas to the outlet. do.

On the other hand, the bottom side of the absorption tower is characterized in that the washing water sprayed by the injection nozzle module absorbs and removes the sulfur compound contained in the flue gas, and then discharges to the outside of the absorption tower.

By providing the present invention configured as described above, it is possible to significantly increase the contact time and contact opportunity between the flue gas and the washing water in the upper space of the second filler located on the uppermost layer of the absorption tower, and based on this, the suction inside the absorption tower It can effectively remove sulfur compounds contained in the flue gas of main engine, generator, and boiler.

1 is a schematic view showing a wet scrubber for a ship according to the present invention and a complex type washing water injection system inside the absorption tower including the same.

Figure 2 is an enlarged view showing a part of the structure in the wet scrubber for ships according to the present invention and the complex type washing water injection system including the absorption tower.

Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings so that a person having ordinary knowledge belonging to the same technical field can easily implement the present invention.

The wet scrubber for ships of the present invention and the complex-type washing water injection system inside the absorption tower including the same spray the washing water, that is, sea water, into the flue gas to dissolve the sulfur compounds contained in the flue gas in the droplets, liquid film, and bubbles generated therefrom. , Is to capture.

Therefore, increasing the removal efficiency of sulfur compounds in the absorption tower is the ultimate purpose of the design of a ship scrubber system and an absorption tower, and for this reason, by installing a packing material inside the absorption tower, spray water sprayed from the top of the filling material and flowing into the filling material (5 ) And the flue gas flowing into the filler from the bottom of the filler make contact with each other, and thus, a method of applying a filler to increase the contact time and contact distance between the washing water 5 and the flue gas is generally applied.

In the present invention, the filler is installed in two stages. Separation and installation method of the filling material can increase the absorption efficiency of sulfur compounds in the cleaning water (5) by spraying fresh cleaning water (5) at each step. By mixing and applying the (Packing) cleaning step, sulfur compounds can be more effectively removed.

Accordingly, the present invention, first, the intake port 101 is provided with the flue gas is suction is provided at the bottom, the pollutants contained in the flue gas is absorbed and treated, the pollutant is absorbed treatment is discharged exhaust gas (102) ) Is provided on the upper side, and an absorption tower 100 having a space in which a washing water injection nozzle module and a filler is installed is provided.

In addition, the filler is installed at intervals above and below the absorption tower 100, and the first filler 140a and the second sequentially absorbing sulfur compounds contained in flue gas passing through the absorption tower 100. It is divided into a filling material (140b).

On the other hand, it is connected to the pipe inside the absorption tower 100 and includes a plurality of injection nozzles 122 and a supply pump 123 to supply / dispensing the washing water 5 into the absorption tower 100. A supply line 120 is provided.

And inside the absorption tower 100 and the upper portion of the suction port 101, the center for preventing the washing water 5 from entering the suction port 101 is inclined upwardly conical shape inflow preventing unit 110 Are spaced apart.

The supply line 120 is connected to a pipe located above the first filler 140a and has a plurality of spray nozzles 122 for spraying washing water 5 upward toward the second filler 140b. A first injection nozzle module 120a; The second injection nozzle module 120b having a plurality of injection nozzles 122 connected to a pipe located above the second filling material 140b and spraying the washing water 5 upward toward the gas-liquid separation device 150 and; The second filling material 140b is divided into a third injection nozzle module 120c having an injection nozzle 122 that is connected to a pipe located on the upper part and sprays the washing water 5 downward toward the second filling material 140b. Can be.

In particular, in the absorption tower proposed in the present invention, the step of spraying the washing water 5 in the upper space of the second filler 140b is the final washing water injection step for absorbing and removing sulfur compounds before the flue gas is discharged outside the absorption tower. As, it directly affects the removal efficiency of the sulfur compound in the entire absorption tower (100).

Therefore, in the present invention, a complex type washing water spraying method was devised and applied so that the efficiency of removing sulfur compounds in the upper space of the second filler 140b was maximized.

In more detail, the second injection module 120b and the third injection module 120c are divided and installed, and the second injection module 120b is a parallel flow in the same direction as the flow direction of flue gas. (Co-Current) sprays the washing water (5), and the third injection module (120c) injects the washing water (5) in a counter-current (Count-Current) method opposite to the flow direction of the flue gas do.

The droplets of the sprayed water, which are divided up and down, collide in the interior space, dispersing into smaller droplets of cleaning water, and at the same time, the flow state of the cleaning water changes to a turbulent flow state.

Due to this, the contact time and the chance of contact between the flue gas and the washing water droplets are greatly expanded, and on this basis, the removal efficiency of the sulfur compound can be increased.

In addition, the washing water reaching the upper portion of the washing water sprayed from the second injection module 120b falls, and again contacts the flue gas rising to the top, through which the removal efficiency of sulfur compounds may be further increased.

Then, at the bottom of the inflow prevention part 110, the supply line 120 is connected to the pipe to spray the washing water 5 toward the first filling material 140a to cool the flue gas sucked into the absorption tower. A cooling injection nozzle module 120d having a plurality of injection nozzles 122 may be included.

On the other hand, between the discharge port 102 and the third injection module (120c) by inducing rotation in the flow of the gas in a straight direction to separate the gas and liquid using centrifugal force to separate gas-liquid to discharge only the gas to the discharge port (102) Device 150 may be included.

In addition, the bottom of one side of the absorption tower 100 is characterized in that a drain 103 is discharged after the washing water 5 sprayed by the spray nozzle 122 absorbs and removes the sulfur compound contained in the flue gas. do.

As shown in FIG. 2, the washing water 5 is sprayed upward in the same direction as the flue gas flow direction in the second injection nozzle module 120b installed on the top of the second filling material 140b, and the sprayed washing water (5) is primarily in contact with the flue gas passing through the second filler 140b, and removes the sulfur compound.

Then, the washing water droplets sprayed downward from the third injection nozzle module 120c and the washing water droplets sprayed upward from the second injection nozzle module 120b collide, and the washing water droplets are finely divided and scattered. , Due to this, the contact opportunity between the washing water droplet and the flue gas is further expanded, and accordingly, the removal efficiency of the sulfur compound may be further increased.

By applying the present invention configured as described above, it is possible to increase the contact time and the contact time between the flue gas and the washing water in the upper space of the second filler 140b located on the uppermost layer of the absorption tower 100, based on this. It is possible to effectively remove the sulfur compounds contained in the flue gas of the main pipe, generator, and boiler sucked inside the water tower.

The terms and words used in the present specification and claims described above should not be construed as being limited to ordinary or lexical meanings, and the inventor appropriately explains the concept of terms in order to explain his or her invention in the best way. Based on the principle that it can be defined, it should be interpreted as meanings and concepts consistent with the technical spirit of the present invention.

Therefore, the configuration shown in the drawings and examples described in this specification is only one of the most preferred embodiments of the present invention, and does not represent all of the technical spirit of the present invention, and can be replaced at the time of this application. It should be understood that there may be various equivalents and variations.

* Explanation of codes

5: washing water

100: absorption tower

101: intake

102: outlet

103: drain

110: inflow prevention part

120: supply line

120a: first injection nozzle module

120b: second injection nozzle module

120c: third injection nozzle module

120d: spray nozzle module for cooling

122: spray nozzle

123: supply pump

140a: first filler

140b: second filler

150: gas-liquid separator

The present invention relates to a wet scrubber system for ships, a suction port through which flue gas is sucked is provided at the bottom, and after the pollutants contained in the flue gas are absorbed, the exhaust gas from which the pollutants are absorbed is discharged. Is provided on the upper, and the absorption tower having a space in which the washing water spray nozzle and filler is installed; A first filler and a second filler which are installed at intervals of upper / lower in the absorption tower to sequentially absorb sulfur compounds contained in flue gas passing through the absorption tower; A supply line including a plurality of injection nozzles and a supply pump to be connected to the absorption tower to supply / inject cleaning water into the interior of the absorption tower; It is installed on the inside of the absorption tower and above the suction port, and is formed in a conical shape with a center inclined upward toward the discharge port, and includes an inflow prevention unit to prevent the inflow of cleaning water into the flue gas intake port, and the supply line. Is a first injection nozzle module having a plurality of injection nozzles connected to a pipe located above the first filling material and spraying cleaning water toward the second filling material; A second spray nozzle module having a plurality of spray nozzles connected to the upper and lower rows of the pipes located above the second filler and spraying cleaning water upward toward the gas-liquid separator; It is connected to the pipe located above the second filler and is divided into a third injection nozzle module having a plurality of spray nozzles for spraying cleaning water downward toward the second filler; The contact time and the chance of contact between the flue gas sucked inside the absorption tower and the washing water sprayed from inside the absorption tower can be significantly expanded, and based on this, it is contained in the flue gas of the main pipe, generator, and boiler sucked inside the absorption tower. It is possible to effectively remove sulfur oxides, thereby reducing the installation cost and operating cost of the system. There is availability.

Claims (4)

The intake port 101 through which the flue gas is sucked is provided at the bottom, and after the sulfur compound contained in the flue gas is absorbed and treated, the exhaust port 102 through which the pollutants are absorbed and the treated flue gas is discharged is provided at the top. , An absorption tower 100 having a space therein; The first filler 140a and the second filler 140b that are installed inside the absorption tower 100 at upper and lower intervals to sequentially absorb sulfur oxides contained in the flue gas passing through the absorption tower 100. )Wow; Supply line including a plurality of spray nozzles 122 and a supply pump 123 to be connected to a pipe inside the absorption tower 100 to supply / dispensing the washing water 5 into the interior of the absorption tower 100 (120) and; It is installed in the interior of the absorption tower (100) and above the suction port (101), and the center is formed in a conical shape inclined upward to prevent inflow of the washing water (5) into the suction port (101). Contains 110, The supply line 120, The first injection nozzle module (120a) having a plurality of injection nozzles 122 connected to the piping located on the upper portion of the first filler (140a) for spraying the washing water (5) toward the second filler (140b) and ; The second injection nozzle module 120b having a plurality of injection nozzles 122 connected to a pipe located on the upper portion of the second filler 140b and spraying the washing water 5 upward toward the second filler 140a )and; The third injection nozzle module 120c having a plurality of injection nozzles 122 connected to a pipe located at the upper portion of the second filler 140b and spraying washing water 5 downward toward the second filler 140a ) Is composed of a wet scrubber for ships, and a composite water washing system inside the absorption tower including the same. The method according to claim 1, Between the outlet 102 and the third injection nozzle module (120c), Including a gas-liquid separator 150 for separating gas and liquid by using a centrifugal force to induce rotation in the flow of gas in a linear direction and discharging only the gas to the outlet 102, including a wet scrubber for ships and the same Complex-type washing water injection system inside the absorption tower. The method according to claim 1, Cooling having a plurality of injection nozzles 122 connected to the supply line 120 at the bottom of the inflow prevention part 110 to inject the flue gas cooling washing water 5 toward the first filler 140a A wet scrubber for ships, characterized by including a spray nozzle module (120d) for use, and a composite water washing system inside the absorption tower including the same. The method according to claim 1, On the lower side of the absorption tower 100, Wet scrubber for ships and absorption including the same, characterized in that a drainage hole (103) discharged to the outside of the absorption tower is installed after the washing water (5) injected by the injection nozzle (122) absorbs and removes sulfur compounds contained in flue gas. Complex water cleaning system inside the tower.

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