KR20180135953A - Wet desulfurization method and equipment of exhaust gas of marine engine - Google Patents

Abstract

According to the present method, the gas 1 to be desulfurized is carried into the scrubber 100 through the vertical chimney 200, which is opened substantially at the center of the bottom surface 101 of the scrubber. The gas flows upward in the scrubber to contact the first scrubbing liquid (3) and the second scrubbing liquid (4) intended to capture the sulfur dioxide contained in the gas. The gas is passed continuously in the scrubber so that the velocity profile of the gas is as flat as possible in the scrubber, a rotating device (400) for passing the gas (1) and rotating the gas in the scrubber (100) A protective device 300 that prevents liquid from flowing into the downstream outlet 201 of the chimney while maintaining a flow of liquid from a central region of the scrubber 100 through which the geometric center axis Z100 of the scrubber passes, (5) for spraying a first scrubbing liquid (3) in the form of at least one pair of liquid curtains in the form of at least one pair of liquid curtains In the form of a lane which extends from the injector of the scrubber to the dispensing device and falls downward in a free space V100 in which the gas 1 freely flows, (600) for dispensing scrubbing liquid (4), said dispensing devices being located at the same height and distributed over the cross section of the scrubber in relation to said height, each of said at least one And a distributor 601 of a stage of the second stage.

Description

Wet desulfurization method and equipment of exhaust gas of marine engine

The present invention relates to a method and an apparatus for wet desulfurization of exhaust gas of a marine engine.

Whether it is a passenger ship or other vessel, most ships use fuel oil as fuel for diesel engines. This fuel oil contains up to 5% by weight, mostly from 0.5 to 3.5% by weight of sulfur. During the combustion process of the engine, this sulfur is converted to sulfur dioxide (SO ₂ ). As a result, the exhaust gas of this engine is acidic.

Maritime regulations in force in certain areas require emissions from ships' chimneys to be limited to those equivalent to 0.1 wt% sulfur in fuel oil. In practice, the emission limit value depends on the navigation area. Emissions of sulfur dioxide should be lower than the sea level near the coast or in the port. It should be noted that even within the port, cruise ships must continue to operate the engine to meet the electricity demand on board, potentially releasing sulfur dioxide. Therefore, in order to comply with the regulations, the vessel must be equipped with measures to reduce sulfur dioxide emissions and fumes before releasing them to the atmosphere. Several solutions can be considered.

It is possible to reduce the sulfur content of the fuel oil used or to use liquefied gas, which immediately reduces sulfur dioxide emissions. However, fuel oil having a very low sulfur or liquefied gas content is expensive, so this method is not very economical.

Another approach is to use a wet scrubber with dispersed neutralizing reagents such as sodium hydroxide. However, the flow rate of sulfur dioxide to be treated can reach up to 500 kg / h per scrubber for very large passenger ships, so the amount of sodium hydroxide to be supplied is significant. Apart from the price of sodium dioxide, there is a need to provide storage and to consider dangerous properties as it is highly corrosive.

Thus, the exhaust gas is mainly scrubbed with seawater. This technique is performed by a scrubber that utilizes the natural alkalinity of the seawater to neutralize sulfur dioxide, and is well known especially in power plants located by the sea. In fact, there are two techniques.

The first technique is based on implementing a scrubber using a liner. The liner is composed of a ring or an inner and is introduced into the scrubber column in bulk or has a structured property. That is, the liner has a structurally repeated pattern in space. These liners are very good in terms of transport efficiency, i.e. the ability to capture sulfur dioxide introduced into the volume used in the scrubber. However, there are two limitations to consider. On the one hand, the pressure loss due to the liner can be substantial, and if the scrubber is to be installed downstream of the diesel engine, the fan must be used to overcome this pressure loss, resulting in energy and additional investment costs. On the other hand, the gas of the diesel engine is very hot, and, despite the presence of the cooling device, it is expected that very hot uncooled gas, for example, exceeding 200 캜, will flow into the scrubber after malfunctioning. Bypass is not always possible, at least the scrubber and liner must be able to withstand dry operation, and therefore the component must be able to withstand temperatures in excess of 200 ° C. To do this, a temperature-resistant material must be chosen for the scrubber and liner. Therefore, in the case of scrubbers installed on ships, chloride-rich, acidic and reducing marine environments are highly corrosive and have a significant impact on the cost of the liner.

The second technique, which uses seawater to reduce sulfur oxides in gas, is widely used in power plants producing energy on land. This second technique uses an empty scrubber where the seawater is dispersed. This dispersion can be carried out in the form of droplets falling into the central region of the scrubber, as taught in FR 1,231,173 and very schematically in Fig. 1, or in the form of liquid curtains as shown very schematically in Fig. 2 .

In this situation, which can be seen from Fig. 1, the gas F to be desulfurized is introduced into the bottom of the scrubber V through a chimney C centered on the bottom of the scrubber. In the central region of the head of the scrubber V the nozzles countercurrently flow downwardly with respect to the gas F which circulates upward in the scrubber with the scrubbing liquid L provided to capture the sulfur dioxide present in the gas F Disperse in the form of droplets falling.

In this situation, which can be seen from FIG. 2, the gas F to be desulfurized is also introduced into the bottom of the scrubber V through the chimney C centered on the bottom of the scrubber. At the center of the scrubber V the injector P is provided to capture the sulfur dioxide present in the gas F in the form of curtains from the region of the geometric center axis ZC of the scrubber V towards the peripheral wall of the scrubber V Thereby spraying the scrubbing liquid.

Both of the solutions of Figures 1 and 2 have advantages. These are simple, and the pressure loss is low as compared with the solution using the liner inside the scrubber since the scrubber V is empty and the gas F freely circulates. Further, since the conveying ability is lower than that of the scrubber using the liner, it is economical even if the height of the scrubber (V) is higher. Finally, since the scrubber (V) is essentially empty, there is no need to worry about its components as well as its ability to withstand corrosion and temperature, as well as its contamination. However, a low pressure loss, which is a major advantage in terms of operation, causes the distribution of gas F within the scrubber V to become a problem. Indeed, in the case of the arrangement of FIG. 1, due to any instability caused by the movement of the vessel, for example due to the small distortion of the distribution of the scrubbing liquid due to the clogging of the nozzle D, or even instability within the meaning of the chaos theory The gas F to be treated is concentrated at one side of the scrubber and the scrubbing liquid is offset to the other side of the scrubber so that the gas F in the scrubber V has an asymmetric and unbalanced velocity profile , Which is not necessarily stable over time and, for example, may have a scale effect in the course of the external movement of the scrubber (V). 2, the gas F to be purified is gradually moved away from the central axis ZV by the transfer of a large amount of the scrubbing liquid L toward the gas F, The velocity profile of the gas (F) undergoes distortions causing non-homogeneity, as it is concentrated in the peripheral wall of the scrubber (V). In both cases, despite the introduction of the gas at the center of the bottom of the scrubber V, the ratio of the liquid to the gas, that is to say the ratio of liquid to gas in the scrubber (V), due to the heterogeneity of the velocity profile of the gas (F) The ratio of the amount of scrubbing liquid and the amount of gas present at the location of the scrubber becomes inhomogeneous in the scrubber and causes a significant loss of gas (F) desulfurization efficiency.

Regarding the problems discussed so far, US 2016/0016109 suggests methods and equipment for desulfurization of exhaust gas of marine engines, which may be thought of as being closest to the methods and equipment claimed herein. In US 2016/0016109, the exhaust gas emitted by the marine engine enters the scrubber through the vertical chimney, which is circulated upward in the scrubber. Inside the scrubber, the gas exiting the chimney comprises a first deflecting member for protecting the inlet of the chimney from liquid inflow, a first water injector for spraying water downward, a second water injector for spraying water upward, The jaw is in continuous contact with the stenotic member, the second biasing member, the third water injector for spraying water downward, and the condenser. The first, second and third injectors are all of the same type. The narrowing member separates the inside of the scrubber into two chambers, a lower chamber in which the first deflecting member and the first and second injectors are disposed, and an upper chamber in which the second deflecting member and the third injector and the condenser are disposed. The stiffening member tends to refocus the gas entering the upper chamber leaving the lower chamber, but all of the first, second and third injectors are located on the geometric center axis of the scrubber and the first, The water injected by the third injector tends to offset the gas circulation to the circumferential wall of the scrubber, so that the circulation of gas in each of the two chambers is exposed to the risk of instability described above. In addition, the presence of the stenotic member inevitably causes a considerable pressure loss, and the water injected into the upper chamber and accumulated in the stenotic member must be recovered through a dedicated extraction device. As a result, the desulfurization effect is changed.

In fields other than desulfurization of exhaust gases, U.S. Patent No. 4,375,976 proposes a method and apparatus for removing dust from a gas stream, particularly an air stream. The gas flow for dust removal is first transferred into the cyclone separator, at which the gas stream is refocused and introduced vertically into the tube projecting from the base of the scrubber. Inside the scrubber, the gas flow circulates upward and continuously meets the protective cone, the water injector, the water injection nozzle and the filter. The protective cone, injector and injection nozzle are aligned along the geometric center axis of the scrubber. The injector P produces a spray which has a low water density substantially similar to a mist and which is injected horizontally from the central axis of the scrubber, the spray aiming to wet the solid particles in the rising gas stream . The injector also injects water in an upwardly directed conical shape to keep the bottom of the filter wet. The dispense nozzle creates a downwardly directed conical water jet to wet solid particles in the gas stream. Such an arrangement is satisfactory for trapping solid particles floating by the gas flow and there is no attempt to desulfurize the exhaust gas discharged by the marine engine.

It is an object of the present invention to provide a scrubber apparatus that solves the above-mentioned drawbacks of exhaust gas desulfurization based on wise and inexpensive embodiments.

To this end, the invention relates to a wet desulfurization method of exhaust gas of a marine engine as defined in claim 1.

The invention also relates to an apparatus for wet desulfurization of exhaust gas of a ship as defined in claim 8.

According to the present invention, the gas to be desulfurized which moves from the bottom to the top through the scrubber has a flat velocity profile as high as possible, so that the gas is very effectively desulfurized by the first and second scrubbing liquids dispersed in the scrubber. In addition, embodiments of the present invention maintain economics based on batches that are individually simple to install and operate.

Further advantageous features of the method and the arrangement according to the invention are specified in the other claims.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be further understood by reading the following description, which is provided by way of example only with reference to the drawings, in which: Fig.

Figures 1 and 2 are schematic diagrams of the conventional desulfurization equipment described above;
3 is a schematic diagram of a desulfurization process desulfurization plant implementing a desulfurization process in accordance with the present invention;
Figure 4 is an elevational view of one embodiment of an apparatus belonging to the installation of Figure 3;
Figure 5 is an elevation view according to arrow V in Figure 4;
Figure 6 is a similarity diagram of Figure 4 illustrating an alternative embodiment of the apparatus of Figure 4;
FIG. 7 is an elevational view along arrow VII in FIG. 6; FIG.
8 is a detailed perspective view of another apparatus belonging to the apparatus of FIG. 3;
Figure 9 is a schematic view along line IX-IX of Figure 3;

Fig. 3 shows a facility capable of desulfurizing the exhaust gas 1 from a marine propulsion diesel engine mounted on a ship. The gas (1) contains sulfur oxides, in particular sulfur dioxide (SO ₂ ).

In the arrangement of FIG. 3, the gas 1 which exits the exhaust outlet of the engine described above and may be pre-denitrified is introduced into the desulfurization scrubber 100 through the chimney 200.

As schematically shown in FIG. 3, the scrubber 100 takes the form of a column extending vertically in the vertical direction during use as a whole. The scrubber 100 has a bottom surface 101 at its base and a peripheral wall 102 of the scrubber extends from the bottom to the top 103. The peripheral wall 102 of the scrubber 100 defines a geometric center axis Z100 that extends vertically when the scrubber 100 is in use.

The scrubber 100 is empty in that there is no inner liner, such as a ring or an inner, as mentioned at the beginning of this disclosure.

For example, a chimney 200 constructed in the form of a sheath or similar duct is disposed below the scrubber 100 and extends substantially vertically to protrude from the bottom surface 101 of the scrubber 100. The downstream of the chimney 200 passes through the wall forming the bottom surface 101 about the central axis Z100 of the scrubber 100 and is connected to the bottom surface 101 of the scrubber 100, The downstream inlet 201 of the scrubber Z100 is substantially coaxial with the peripheral wall 102 of the scrubber. The exhaust gas is introduced into the bottom surface 101 of the scrubber 100 by the chimney 200 and once circulated upward from the bottom surface 101 to the inside of the scrubber 100 and purified (2). ≪ / RTI >

The intake of the gas 1 by this vertical chimney 200 is advantageous in the case of the installation of Fig. 3 installed on the vessel, since this configuration occupies less space than the side introduction of the scrubber, In the case of a scrubbing column.

The flow rate of the gas 1 is, for example, 50,000 to 200,000 Nm ³ / h, and the inside diameter of the peripheral wall 102 of the scrubber 100 is set to be within the range of, for example, For example, it is 3 to 6 m.

According to one feature of the invention, the scrubber 100 has a protective device 300 built into the lower portion of its peripheral wall 102, which protects the inlet 201 of the chimney 200, Thereby preventing the gas 1 from flowing out of the chimney. In other words, the protector 300 prevents any liquid from falling or flowing from the area protruding from the outlet 201 by gravity in the chimney 200, while the gas 1 coming out of the chimney is prevented Allowing it to diffuse into the interior of the scrubber (100). Protective device 300 is important in that liquid can not be introduced from chimney 200 where liquid can rise towards the diesel engine through which gas 1 escapes for safety reasons.

In practice, various embodiments for this protection device 300 can be considered. An embodiment that is fairly open to limit the pressure loss in the protective device 300 is preferred. To this end, one embodiment of the protective device 300 illustrated in Figures 4 and 5 is a Chinese hat 301, i.e., a cone, which has a semi-conical angle of at least 60 [deg.], 100 on the axis Z100. A more sophisticated embodiment compared to the Chinese cap 301 is shown in Figures 6 and 7 to limit the fall of the gas 1 towards the peripheral wall 102 of the scrubber 100. [ This protective device 300 consists of an assembly 302 comprising coaxially stacked pivot cone 302.1 and two conical trunks 302.2 and 302.3 and conical elements 302.1, Has a pit conical angle of 60 degrees and is substantially centered on the axis Z100 of the scrubber 100 in the installation of FIG. Of course, in an alternative arrangement not shown, the number of cone trunks 302.2, 302.3 may be reduced to one, or vice versa.

According to one feature of the present invention, the scrubber 100 has a rotating device 400 embedded in its lower part of its circumference 102, through which the gas 1 exiting the chimney 200 passes through a protective device 300 in the scrubber 100 prior to reaching the scrubber 100. The rotating device 400 is installed at the entrance 201 of the chimney 200, for example, as schematically shown in Fig. Alternatively, the rotating device 400 is capping the inlet 201, or is disposed a little downstream of the inlet 201.

In practice, the embodiment of this rotating device 400 is not limited with respect to the present invention. 3, the rotating device 400 includes a blade 401 for deflecting the gas 1, which is fixedly disposed within the rotating device 400, Are supported by the central core 402 and are regularly distributed about the central axis Z100 of the scrubber 100 in the arrangement of FIG. It is advantageous that six to ten deflection blades 401 are provided. 8 shows an exemplary embodiment corresponding to the rotating device 400 in more detail. As an alternative, not shown, the rotating device 400 may be similar to that used at the inlet of the cyclone separator. Regardless of this embodiment, the rotating device 400 imparts pivoting motion to the gas 1 circulating through the device, such that the gas 1 is concentrated in one side within the scrubber 100, Thereby preventing damage to the opposite side.

According to one feature of the present invention, the scrubber 100 has an injector 500 embedded in the running portion of its peripheral wall 102, which substantially extends from the central axis Z100 to the peripheral wall 102 of the scrubber 100 To spray the scrubbing liquid 3 in the form of a liquid curtain. The injection device 500 is aperiodic or consists of several separate injection elements as will be described below so that the curtain of the liquid 3 is drawn from a region that is not strictly restricted to the central axis Z100 of the scrubber 100, Is not injected from the central region of the scrubber 100 passing through the axis Z100. As shown in Figure 3, the curtain of each liquid 3 injected by the injector 500 extends from the injector 500 to the peripheral wall 102 of the scrubber 100, Each of the curtains to be sprayed covers the entire cross-section of the scrubber 100 outside the injector 500. Also as shown in Figure 3, the curtains of the liquid 3 are paired and one or more of these pairs are possible. Two curtains of each pair are ejected from the injector 500 on both sides of the same geometric horizontal plane H to form an angle that is strictly less than 90 degrees with respect to the axis Z100. According to a practical but non-limiting embodiment, the two curtains of each pair are substantially symmetrical with respect to the horizontal plane H associated with the pair, which the two curtains have with respect to the axis ZlOO, It is said to form an angle of the same value displayed. According to an advantageous optional dimension, the value of alpha is 50 DEG to 70 DEG. In all cases, when the equipment of FIG. 3 is in use, the gas 1 that has reached the protective device 300 is circulated upward in the scrubber 100, passes through the bottom curtain, and then flows through the entire cross- Passes the curtain of each pair of liquid 3, which is sprayed by the injector 500, in the vicinity of the injector 500 and near the peripheral wall 102 of the scrubber and between the device and the wall, . In this way the entire flow of gas F from the protective device 300 passes through the curtains of the two liquid curtains or each pair of liquids 3 so that the sulfur oxides are transferred into the scrubbing liquid 3, It is possible to capture sulfur oxides contained therein.

Accordingly, the injector apparatus 500 is used to disperse a large amount of the scrubbing liquid 3 without generating a large amount of pressure loss. Thus, the injector apparatus 500 cools the gas 1, that is, the gas 1 in the scrubber 100, which is typically between 150 ° C and 450 ° C, at a final thermodynamic equilibrium temperature, typically between 20 ° C and 70 ° C, And the final temperature value depends on the initial temperature and the water content of the gas (1). In addition, in the running portion of the scrubber 100 where the injector 500 is located, the ratio of liquid to gas has a high value, which makes it possible to quickly capture sulfur oxides, especially sulfur dioxide with high concentration.

The curtains of each pair of bottoms intersect each pair of top curtains before the curtains reach the peripheral wall 102 of the scrubber 100 to further increase the desulfurization efficiency, 3 is generated so that an additional transfer surface is formed between the liquid 3 and the gas 1 so that each horizontal plane (as shown in FIG. 3) H), the curtains of the plurality of pairs of liquids 3 may be ejected by the ejector apparatus 500. In this way,

In practice, the embodiment of the injection device 500 is not limited in the present invention, and the injection device 500 is in any case placed on the protection device 300. As one example, as schematically contemplated in FIG. 3, the injector 500 includes one or more injectors 501 that include a technique known per se, and the curtains of each pair of liquid 3 are injectors (not shown) 501, each of which is located in the aforementioned central region of the scrubber 100 or is located substantially on the central axis Z100 of the scrubber 100 and the injector 501 is located on the axis < RTI ID = 0.0 > (Z100). Alternatively, it is contemplated that the plurality of injectors 501 are located substantially on the same horizontal plane and at a distance from each other, and all others are located in the aforementioned central region of the scrubber 100. For example, three injectors are provided that are located at the vertices of a substantially horizontal geometric triangle. Of course, this alternative can be combined with the stage (s) of the previously considered injector 501. In this case, each stage includes a plurality of injectors 501 arranged, for example, in a triangle or other arrangement. In all cases, the number of injection stages (s) of the injector 500 and the number of injectors 501 per injection stage depend on the concentration of sulfur oxides in the gas 1 as well as the purge level to be provided, For example, 1 to 2, and the number of injectors per stage is, for example, 1 to 3.

Regarding a multiple of the above-mentioned magnitude, the flow rate of the scrubbing liquid 3 injected by each pair of curtains, that is to say by each injector 501, is, for example, 30 to 200 m ³ / h .

According to another aspect of the present invention, the scrubber 100 has a distribution device 600 installed in an upper portion of a peripheral wall 102 thereof, which is installed on the spray device 500, The scrubbing liquid 3 can be dispensed to the dispensing apparatus 600 in the form of rain falling downward in a free space V100 disposed within the peripheral wall 102 of the scrubber 100 of the scrubber 100. [ Within this free space V100 the gas 1 which has passed through the curtain of the liquid 3 freely circulates upward in the scrubber 100 and meets the countercurrent lane formed by the scrubbing liquid 3, Thereby providing a complementary purification of the gas by trapping of sulfur oxides still present in the gas in the liquid 4.

This embodiment of the dispensing apparatus 600 in the present invention is not limited. As an example, as schematically shown in FIG. 3, the dispensing apparatus 600 includes a dispenser 601, which is known per se, and is, for example, a spray nozzle, a spray bar, a spray head, and the like. If possible, the distributor 601 may also be arranged in two or more stages, for example one or more, for example four, preferably vertically, as shown in Fig. In all cases, on each of these stages, on the same level, which is located at substantially the same level, that is, along the axis Z100, and whose number is, for example, 5 to 30, The distributor 601 is disposed over the cross-section of the scrubber in relation to the height. In this way and by providing each dispenser 601 of each stage to dispense a portion of the lane from the liquid 4, lanes from the liquid 4 obtained below the dispensing device 600 can be dispensed with, Even if the distributor 601 is not strictly homogeneous, it falls over the entire cross section of the free space V100.

With respect to multiples of the above-mentioned size, the flow rate of the scrubbing liquid 3 distributed by each stage of the dispensing apparatus 600 is about 200 m ³ / h.

Of course, multiples and values of these sizes are not limited in the present invention. Depending on the size of the desulfurization plant, these values can be adjusted and can be much larger or much smaller than previously given values.

The composition of each of the scrubbing liquids 3 and 4 is not limited in the present invention. Each of the liquids (3, 4) preferably comprises seawater and, if possible, is doped with an alkaline reagent. In this case, one and / or the other of the scrubbing liquid 3, 4 may consist of a limestone or lime suspension or a sodium solution. Further, according to the first operability, the composition of each of the scrubbing liquids 3,4 is the same. According to an alternative operability possibility, the composition of the scrubbing liquid 4 is not the same as that of the scrubbing liquid 3, and in particular the scrubbing liquid 4, for example fresh sea water which may or may not be doped with an alkaline reagent While the scrubbing liquid 3 may be a recirculating liquid, particularly partially depleted seawater. In all cases, the total amount of scrubbing liquids 3, 4 dispensed by the dispensing apparatus 500 and dispensed by the dispensing apparatus 600 is determined by the total amount of scrubbing liquid 3, 4 in the gas 1, , kg / h unit).

According to one optional advantageous feature of the present invention, the scrubber 100 incorporates a condenser 700, which can hold the droplet in the purge chamber 2 in a manner known per se, This droplet moves to the outside of the scrubber 100 in the absence of the condenser. The condenser 700 is located above the distribution apparatus 600 so that the gas 1 passes through during use and the gas 1 circulates upward in the interior of the scrubber 100 after reaching the distribution apparatus 600.

This embodiment of the condenser 700 is not limited in the present invention. For example, the condenser 700 is composed of a basket having a bracket.

The arrangement of Figure 3 is directed to the injector 500 with the central vertical introduction of the gas 1 into the bottom 101 of the scrubber through the chimney 200 and the rotation of the gas inside the scrubber by the rotary device 400 Due to the combined effect of the curtain of the scrubbing liquid 3 injected by the dispensing device 600 and the lanes of the scrubbing liquid 4 dispensed by the dispensing device 600, 1). In fact, the velocity profile of the very inhomogeneous gas 1 immediately downstream of the protective device 300 is gradually and quickly re-homogenized under the combined action of the injector 500 and the dispensing device 600. The rotation of the gas 1 by the rotating device 400 also prevents oscillation instability of the gas 1, in particular between two opposing zones of the scrubber 100.

The contact arrangement of the gas 1 and the scrubbing liquid 3 is such that the contact between the gas 1 and the scrubbing liquid 4 and the contact between the gas 1 and the scrubbing liquid 4, Will be understood to be other types. This difference in contact type is advantageous for the desulfurization efficiency and also allows the injector 500 to inject a flow rate of the liquid 3 much larger than the flow rate of the liquid 4 dispensed by the dispensing device 600 , And therefore the flow rate of the liquid (3) is 1.5 times or even twice as large as the flow rate of the liquid (4). In this way, desulfurization is carried out with more liquid 3 than liquid 4, and on the one hand, the flow rate of the liquid 4 (which has the greatest effect on the pressure loss inside the scrubber 100) On the other hand, when the gas starts to circulate inside the scrubber, that is, when a high ratio of the liquid to the gas is desired in order to treat the gas with a high concentration of sulfur dioxide, The flow rate can be increased.

As an optional and advantageous refinement, the dispensing device 600 is designed such that the distribution density of the scrubbing liquid 4 is lower at the center of the scrubber than at the periphery of the scrubber. In practice, this example of improvement is based on a dedicated selection and / or placement of the distributor 600 of the distribution apparatus 601, wherein the dedicated selection means that the distributors 600 do not necessarily all have to be the same, The position of the distributor 601 is not necessarily uniform. In other words, the number and type of distributors 601 per square meter may vary across the cross section of the scrubber 100.

In order to better understand this point, Figure 9 shows a cross section of the scrubber 100 in the free space V100 of the scrubber, which is virtually divided into two parts: the central part (S100.1) through which the central axis Z100 of the scrubber passes And the peripheral portion S100.2 around the central portion S100.1. The areas of the central portion S100.1 and the peripheral portion S100.2 are the same, The distribution density of the scrubbing liquid 4 (i.e., the area of the central portion S100. 1) in the central portion S100. 1, the scrubbing liquid dispensed by the dispensing device 600 in the central portion S100. (4) flow rate ratio of the (for example, m ³ / m ² / h indicated by a)) comprises: (a density distribution of the scrubbing liquid (4) in S100.2) (i.e., a peripheral portion (S100.2) peripheral portion (Expressed in the same unit) of the flow rate of the scrubbing liquid 4 distributed by the distributing apparatus 600 in the peripheral portion S100.

Therefore, the droplet of the lane of the scrubbing liquid 4 falling into a portion of the space V100 (whose cross section corresponds to the peripheral portion S100.2) is the remaining portion of the space V100 (i.e., the center portion S100. 1) is greater than that falling within the area of the space having the cross-section corresponding to " 1 " Thus, the liquid 4, which is dispensed into the portion of the space V100 associated with the peripheral portion S100.2, causes a greater friction against the gas 1 circulating upward in the portion of the space V100, The rebalance is made for the rest of the gas supply V100 so that the effects of the injector 500 and the protection device 300 on the gas 1 are at least partially compensated.

Actually, depending on the operating state of the facility, that is, depending on the flow rate of the gas 1, the composition of the gas and the temperature, the scrubbing liquid (hereinafter referred to as " 4) can be adjusted manually or automatically.

Thus, the overall profile of the ratio of the liquid to the gas, which is more favorable for the desulfurization of the gas 1, is obtained again in the scrubber 100.

Example:

The present invention was tested with the following specifications.

Of Fig facilities, and it processes the exhaust gas (1) of 105,000 Nm ³ / h from entering bottom 101 of the scrubber 100 via the chimney 200 at a temperature of 390 ℃. The scrubber 100 has, at its peripheral wall 102, an inner diameter of 3200 mm and a total height of about 10 m. The chimney 200 has an inner diameter of 1800 mm. The rotating device 400 includes eight redirecting blades 401. Protective device 300 is in the form of a Chinese hat 301 of FIGS. Each of the four stay injectors 501 injects a scrubbing liquid ³ of 80 m ³ / h. A single stage dispenser 601 dispenses 200 m ³ / h of scrubbing liquid 4. The condenser 700 has a bracket.

By performing this embodiment, a rapid uniformization of the velocity profile of the gas 1 within the scrubber 100 can be observed, which profile is highly non-uniform just downstream of the guard device 300, while free space V100 ).

Claims (15)

As a wet desulfurization method of exhaust gas of a marine engine,
The gas 1 to be desulfurized is introduced into the scrubber 100 through the vertical chimney 200 protruding from the substantially center of the bottom surface 101 of the scrubber,
The gas 1 is circulated upward in the scrubber 100 which is installed in contact with a first scrubbing liquid 3 and a second scrubbing liquid 4 provided to trap the sulfur dioxide contained in the gas, Continuously in the scrubber,
A rotary device 400 for rotating and passing the gas 1 in the scrubber 100,
A protective device 300 for preventing the introduction of liquid into the downstream inlet 201 of the chimney 200 while maintaining the circulation of the gas 1,
An injection device for injecting said first scrubbing liquid (3) in the form of at least one pair of liquid curtains from a central region of said scrubber (100) through which the geometric central axis (Z100) of the scrubber passes, (500) - each said pair of liquid curtains is ejected from said injector on both sides of the same horizontal plane (H) associated with said pair,
In the form of rain extending down from the injector 500 to the distributor 600 and falling downward in the free space V100 of the scrubber 100 in which the gas is freely circulated, 2 Continuously encountering dispensing device 600 for dispensing scrubbing liquid 4,
Wherein the dispensing device includes at least one stage of dispenser (601) positioned at the same height that is dispensed across a cross-section of the scrubber associated with the height, and distributes a respective fraction of the corresponding lane,
A wet desulfurization method of exhaust gas of a marine engine. The method according to claim 1,
Wherein the flow rate of the first scrubbing liquid (3) injected by the injector (500) is greater than the flow rate of the second scrubbing liquid (4) dispensed by the dispensing device (600)
A wet desulfurization method of exhaust gas of a marine engine. 3. The method according to claim 1 or 2,
The cross section of the scrubber 100 under the dispensing device 600 is composed of a center portion S100.1 and a peripheral portion S100.2 having the same area and the second scrubbing liquid 4), i.e. the ratio of the flow rate of the second scrubbing liquid dispensed by the dispensing device (600) at the central portion to the area of the central portion, is greater than the dispense density of the second scrubbing liquid That is, the ratio of the flow rate of the second scrubbing liquid dispensed by the dispensing device at the peripheral portion to the area of the peripheral portion,
A wet desulfurization method of exhaust gas of a marine engine. 4. The method according to any one of claims 1 to 3,
Two or more pairs of liquid curtains with respect to each horizontal plane H located at different heights are injected by the injector 500 and belong to a first pair and a second pair located above the first pair, Each of the two liquid curtains being sprayed onto the horizontal plane associated with the first pair and projecting below the horizontal plane associated with the second pair,
A wet desulfurization method of exhaust gas of a marine engine. 5. The method according to any one of claims 1 to 4,
Wherein each of the two liquid curtains injected by the injector apparatus 500 forms an angle alpha of 50 DEG to 70 DEG with respect to the central axis Z100 of the scrubber 100,
A wet desulfurization method of exhaust gas of a marine engine. 6. The method according to any one of claims 1 to 5,
Wherein the first scrubbing liquid (3) and the second scrubbing liquid (4) comprise seawater or comprise seawater,
A wet desulfurization method of exhaust gas of a marine engine. 7. The method according to any one of claims 1 to 6,
Wherein the composition of the first scrubbing liquid (3) and the second scrubbing liquid (4)
A wet desulfurization method of exhaust gas of a marine engine. As an apparatus for wet desulfurization of exhaust gas of a marine engine,
The facility includes:
- a scrubber (100) in a bottom surface (101) in which a vertical chimney (200) for suction of gas (1)
A rotating device 400 suitable for passing the gas 1 coming out of the chimney 200 to rotate the gas in the scrubber 100,
A protective device 300 suitable for preventing liquid from being introduced into the downstream inlet 201 of the chimney 200 while allowing passage of the gas 1 from the chimney,
- suitable for jetting said first scrubbing liquid (3) in the form of at least one pair of liquid curtains from the central region of said scrubber (100) through which the geometric central axis (Z100) of the scrubber passes, Injector arrangement 500, wherein each pair of liquid curtains is ejected from the injector on both sides of the same horizontal plane (H) associated with the pair, and
- a portion of the rain that extends downward from the injector 500 into the dispenser 600 and falls down in the free space V100 of the scrubber 100 to which the gas 1 is freely circulated. And a dispensing device (600) adapted to dispense the second scrubbing liquid (4)
Wherein the dispensing device comprises at least one stage of dispenser (601) positioned at the same height, dispensed across a cross-section of the scrubber associated with the height, and distributing a respective fraction of the corresponding lane,
The rotating device 400, the protective device 300, the injector 500 and the dispensing device 600 are connected to a desulfurized gas 1 Is arranged to contact the first scrubbing liquid (3) and the second scrubbing liquid (4) provided to trap sulfur dioxide contained in the gas in the scrubber, and the rotating device, the protective device, , And then disposed inside the scrubber (100) to be in continuous contact with the dispensing device
Equipment for wet desulfurization of marine engine exhaust gases. 9. The method of claim 8,
The injector 500 includes a single injector 501 positioned within the central region of the scrubber 100 and adapted to inject the first scrubbing liquid 3 in the form of a pair of liquid curtains.
Equipment for wet desulfurization of marine engine exhaust gases. 9. The method of claim 8,
The injector 500 comprises a plurality of injectors 501 suitable for injecting the first scrubbing liquid 3 in the form of a pair of liquid curtains and all located in the central region of the scrubber 100 Including,
At least a portion of the injector
- a second injector which is injected by said first injector over said horizontal plane (H) associated with said pair of first injectors and which is located above said first injector below said horizontal plane associated with said pair of second injectors Is arranged stepwise along the central axis (Z100) of the scrubber (100) so that two liquid curtains injected by the liquid curtain cross each other, and / or
- arranged substantially spaced from one another in the same horizontal plane,
Equipment for wet desulfurization of marine engine exhaust gases. 11. The method according to any one of claims 8 to 10,
The rotating device 400 includes a blade 401 fixedly distributed around a central axis Z100 of the scrubber 100 and is provided with six to ten blades,
Equipment for wet desulfurization of marine engine exhaust gases. The method according to any one of claims 8 to 11,
The dispenser (600) includes a plurality of stages of distributors (601), each stage being located at a different height,
Equipment for wet desulfurization of marine engine exhaust gases. 13. The method according to any one of claims 8 to 12,
The protector 300 comprises a Chinese hat 301, that is, a cone having a cone angle of at least 60 degrees,
Equipment for wet desulfurization of marine engine exhaust gases. 13. The method according to any one of claims 8 to 12,
The protector 300 includes a coaxial and overlapped apical cone 302.1 and at least one cone trunk 302.2 302.3 coaxially positioned below the pivot cone 302.1, Wherein said pivot cone and said conical trunk both have a pit-
Equipment for wet desulfurization of marine engine exhaust gases. 15. The method according to any one of claims 8 to 14,
The apparatus further comprises a condenser (700) disposed within the scrubber (100) through which the gas (1) passes after it has met the dispensing apparatus (600)
Equipment for wet desulfurization of marine engine exhaust gases.

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