CN104520571A - Exhaust gas purification device and marine engine system provided with same - Google Patents

Abstract

Provided is an exhaust gas purification device capable of reducing the overall material quantity (size and weight) of the exhaust gas purification device, thereby achieving reduction in cost. In the exhaust purification device (13) for reducing and removing air pollutants in the exhaust gas (14) discharged from the main engine (12) for a ship, it is provided with: connected to the main engine (12) for a ship, for The exhaust line (18) is discharged into the atmosphere by the exhaust gas (14) discharged from the main engine (12); it is set in the form of a branch from the exhaust line (18), which is used to discharge the exhaust gas in the exhaust line (18) Part of the gas (14) is supplied again to the circulation line (24) of the main engine (12) for the ship; an exhaust scrubber installed on the exhaust line (18) to purify the exhaust gas (14) discharged into the atmosphere (21); and a circulation scrubber (26) provided on the circulation line (24) for purifying the exhaust gas (14) supplied again to the ship main engine (12).

Description

Exhaust purification device and ship engine system equipped with the exhaust purification device

technical field

The present invention relates to an exhaust purification device applied to, for example, a diesel engine as a main engine for ships, and a ship engine system including the exhaust purification device.

Background technique

With regard to exhaust gas discharged from marine main engines, exhaust gas regulations related to air pollutants such as sulfur oxides (SOx) and nitrogen oxides (NOx) are being strengthened. Therefore, there is provided an exhaust purification device that reduces and removes sulfur oxides (SOx), nitrogen oxides (NOx) and the like in exhaust gas discharged from a marine main engine (for example, refer to Patent Document 1).

The exhaust purification device includes an exhaust purification device and an exhaust gas recirculation device. The exhaust cleaning device is installed in the exhaust line of the main engine of the ship, and cleans all the exhaust gas. Then, the exhaust gas recirculation device resupplies a part of the exhaust gas cleaned by the exhaust gas cleaning device to the main engine of the ship as exhaust gas for recirculation.

According to this exhaust purification device, the entire exhaust gas is cleaned by the exhaust gas cleaning device, so that sulfur oxides and particulate matter in the exhaust gas can be removed by the exhaust gas cleaning device.

Furthermore, according to the exhaust gas recirculation device, the generation of nitrogen oxides in the marine main engine can be suppressed by resupplying the exhaust gas for recirculation whose oxygen concentration is lower than that of air to the marine main engine.

In this way, the exhaust gas with reduced content of sulfur oxides and nitrogen oxides can be discharged into the atmosphere.

Prior art literature:

Patent documents:

Patent Document 1: Publication No. 2012-47056.

Contents of the invention

Problems to be solved by the invention:

However, although the purification standard JK (such as the degree of removal of sulfur oxides and particulate matter contained in the exhaust gas) required for the exhaust gas supplied to the main engine of the ship is higher than that required for the exhaust gas discharged into the atmosphere Standard JT (e.g. emission limits stipulated in international treaties, etc.), but in the above-mentioned existing exhaust purification device, the purification standard JT of the exhaust gas discharged into the atmosphere is increased to the exhaust station supplied to the main engine of the ship. The required purification standard JK, therefore, the volume (size, weight) and cost of the exhaust gas cleaning device increase accordingly.

Therefore, if such a conventional exhaust purification device is adopted in a ship, the amount of material in the engine room increases, resulting in a decrease in the cargo space of the ship or an increase in the weight of the ship. As a result, there is a problem that the cargo tonnage (ability to carry cargo) of the ship decreases.

In addition, when the volume of the entire exhaust purification device increases, the size of the ship increases, resulting in an increase in water resistance and an increase in fuel consumption.

The present invention is made to solve such problems, and an object of the present invention is to provide an exhaust gas purification device capable of reducing the cost by reducing the overall volume (size and weight) of the exhaust gas purification device, and a ship equipped with the exhaust gas purification device. engine system.

Means to solve the problem:

The exhaust gas purification device according to the present invention is an exhaust gas purification device for reducing and removing air pollutants in the exhaust gas discharged from a main engine for a ship, and is provided with: being connected to the main engine for a ship, and used to discharge the air pollutants from the main engine for a ship; An exhaust line that discharges the exhaust gas to the atmosphere; it is provided in a form branched from the exhaust line, and is used to resupply a part of the exhaust gas in the exhaust line to the circulation line of the main engine for the ship an exhaust scrubber provided on the exhaust line for purifying exhaust exhaust discharged into the atmosphere; and a cycle for purifying exhaust resupplied to the main engine of the ship provided on the circulation line Use a scrubber.

According to the exhaust gas purification device of the present invention, the exhaust gas discharged from the main engine of the ship and passed through the exhaust line can be purified to the purification standard to the extent that it can be discharged into the atmosphere by the scrubber for exhaust gas, and then discharged into the atmosphere. In addition, the exhaust gas passing through the circulation line branched from the exhaust line can be purified to a purification standard that can be supplied to the marine main engine by the circulating scrubber, and then supplied to the marine main engine. In addition, by supplying exhaust gas having a lower oxygen concentration than air to the marine main engine through the circulation line, the generation of nitrogen oxides in the marine main engine can be suppressed. With this, it is possible to reduce the concentration (content rate) of nitrogen oxides in the exhaust gas discharged into the atmosphere.

In the exhaust gas purification device according to the present invention, it is preferable that the circulation scrubber purifies the exhaust gas at a higher standard than the exhaust gas scrubber.

The present invention is formed in view of the fact that the purification standard required for the exhaust gas supplied to the marine main engine is higher than the purification standard required for the exhaust gas discharged into the atmosphere. Therefore, it is reasonable that the scrubber for exhaust gas can be set in a form capable of purifying the exhaust gas to a purification standard that can be discharged into the atmosphere and then discharging it to the atmosphere. Furthermore, it is reasonable that the circulation scrubber can be set in such a manner that it can purify the exhaust gas to a purification standard that can be supplied to the marine main engine and then supply it to the marine main engine.

In the exhaust gas purification device according to the present invention, it is preferable that the scrubber for exhaust gas is used to remove sulfur oxides in exhaust gas; the scrubber for circulation is used to remove sulfur oxides and powdery particles in exhaust gas .

According to such a configuration, for example, the purification treatment capability of the exhaust gas scrubber can be appropriately set according to the content rate of sulfur oxides in the exhaust gas that is allowed to be discharged into the atmosphere. In addition, for example, the purification treatment capacity of the circulation scrubber can be appropriately set according to the content of sulfur oxides and particulate matter in the exhaust gas that is allowed to be supplied to the main engine for ships. With this, it is possible to reduce the amount (size and weight) of the entire exhaust purification device.

In the exhaust purification device according to the present invention, it is preferable that the scrubber for exhaust gas and the scrubber for circulation use circulating liquid for purifying exhaust gas, and the circulating liquid is extracted in the circulating liquid tank and the centrifugal separator. Purification, the waste separated in the centrifugal separator is stored in the waste tank, and the pH of the circulating liquid is adjusted using the chemical supplied from the chemical tank; the circulating liquid tank, the centrifugal separator, the waste tank And either one or all of the chemical tanks are shared by both the exhaust scrubber and the circulation scrubber.

In this way, exhaust gas purification can be achieved by forming a structure in which any or all of the circulating liquid tank, centrifugal separator, waste tank, and chemical tank are shared by both the exhaust scrubber and the circulation scrubber. Further reduction in the overall volume (size and weight) and cost of the device.

In the exhaust gas purification device according to the present invention, it is preferable that the exhaust gas scrubber is provided on a downstream side of a flow direction of the exhaust gas compared to a branch portion where the circulation line is branched from the exhaust line.

In this way, the scrubber for exhaust gas only needs to have the purification treatment ability to purify the exhaust gas of the remaining flow after subtracting the flow rate of circulating exhaust gas diverted to the circulation line from the exhaust gas discharged from the main engine of the ship, so as to achieve Miniaturization of this exhaust scrubber.

In the exhaust gas purification device according to the present invention, it is preferable that the scrubber for exhaust gas is provided on an upstream side of a flow direction of exhaust gas compared to a branch portion where the circulation line is branched from the exhaust line.

In this way, when all the exhaust gas discharged from the marine main engine is purified by the exhaust scrubber, the exhaust gas resupplied to the marine main engine can be purified using both the exhaust scrubber and the circulation scrubber. This makes it possible to reduce the size of the recycling scrubber, thereby reducing the volume and cost.

In the exhaust gas purification device according to the present invention, it is preferable that the scrubber for exhaust gas and the scrubber for circulation are formed as an integrated type scrubber, and the circulation line from the The bifurcated portion of the exhaust line is bifurcated, and the integrated scrubber is connected to the circulating liquid tank through a common circulating liquid line.

In this way, by adopting a structure in which the integrated scrubber including the scrubber for exhaust and the scrubber for circulation uses a common circulation line, the circulation line can be simplified and the overall load in the circulation line can be reduced. The liquid volume of the circulating fluid can further reduce the volume and cost of the exhaust gas purification device as a whole.

A marine engine system according to the present invention includes the exhaust purification device according to the present invention.

The marine engine system according to the present invention includes the exhaust gas purification device according to the present invention, so that the exhaust gas purification device can exert the same function as described above.

Invention effect:

According to the exhaust gas purification device and ship engine system of the present invention, the exhaust gas discharged into the atmosphere is purified by the exhaust scrubber, and the exhaust gas supplied to the main engine for the ship is purified by the circulation scrubber, so that The scrubber for exhaust and the scrubber for circulation can be set according to the required purification standard, the type and amount (volume, weight) of the air pollutant to be purified, and the amount (volume, weight) of the exhaust gas to be purified. The respective purification treatment functions and capabilities, etc. With this, it is possible to reduce the amount (size and weight) of the entire exhaust gas purification device, and to reduce the cost of the exhaust gas purification device.

Moreover, when the exhaust purification device and the ship engine system are used in the ship, the amount of material in the engine room can be reduced, by means of which the cargo space of the ship can be increased, or the weight of the ship can be reduced. As a result, the ship's cargo tonnage (ability to carry cargo) can be increased.

In addition, since the volume of the entire exhaust purification device can be reduced, the ship can be downsized. With this, water resistance can be reduced, and fuel consumption can be reduced.

Description of drawings

FIG. 1 is a block diagram showing a ship engine system according to a first embodiment of the present invention;

Fig. 2 is a block diagram showing a ship engine system according to a second embodiment of the present invention;

3 is a block diagram showing a ship engine system according to a third embodiment of the present invention;

4 is a block diagram showing a ship engine system according to a fourth embodiment of the present invention;

Fig. 5 is a block diagram showing a ship engine system according to a fifth embodiment of the present invention.

Detailed ways

Hereinafter, a first embodiment of an exhaust purification device according to the present invention and a ship engine system including the exhaust purification device will be described with reference to FIG. 1 . The marine engine system 11 shown in FIG. 1 is provided with an exhaust purification device 13 in a marine main engine 12 . The exhaust purification device 13 is to reduce and remove sulfur oxides and nitrogen oxides contained in the exhaust gas 14 of the main engine (such as a diesel engine) that is a main engine 12 for marine propulsion (hereinafter referred to as "the main engine"). Air pollutants (hazardous substances) such as air pollutants.

As shown in FIG. 1 , a main engine 12 for propulsion of the ship is mounted in an engine room of the ship, and exhaust gas 14 discharged from the main engine 12 is discharged to the atmosphere through a chimney.

The main unit 12 includes a plurality of cylinders 15 , an intake manifold 16 and an exhaust manifold 17 . Fuel supplied from a fuel supply device not shown is injected into each cylinder 15 . This fuel is combusted in the cylinder 15 by oxygen in the intake air supplied from the intake manifold 16, so in the main unit 12, the thermal energy held by the fuel is converted into an output of the main unit 12, and exhaust gas 14 is generated by combustion .

Exhaust gas 14 generated in each cylinder 15 is collected in an exhaust manifold 17 . Furthermore, the exhaust manifold 17 is connected to an exhaust line 18 . The exhaust line 18 discharges the exhaust gas 14 collected in the exhaust manifold 17 to the atmosphere through a chimney. A turbine unit 20 of an exhaust turbocharger 19 and an exhaust scrubber 21 are provided on the exhaust line 18 .

The exhaust turbocharger 19 is a device that rotates the turbine unit 20 at a high speed using energy (kinetic energy and thermal energy) contained in the exhaust gas 14 , and rotates the compressor unit 22 by the rotational force to compress intake air (exhaust gas 14 ). In addition, the reference numeral 23 in the figure is the rotation shaft which connects the turbine part 20 and the compressor part 22 mutually.

The exhaust gas scrubber 21 is used to clean the exhaust gas 14 discharged into the atmosphere. That is, the exhaust scrubber 21 is a device for removing air pollutants (harmful substances) contained in the exhaust gas 14 . According to this scrubber 21 for exhaust gas, particulate matter such as sulfur oxides and soot, which are air pollutants in the exhaust gas 14 , can be captured in droplets or a liquid film of the cleaning liquid and separated. The exhaust gas 14 treated in the scrubber 21 for exhaust gas has passed through the turbine part 20 of the exhaust gas turbocharger 19, so the pressure is lowered and the temperature is slightly lowered. Therefore, the scrubber 21 for exhaust gas is less likely to be adversely affected by the exhaust gas 14 , and can maintain high reliability and durability.

Furthermore, as shown in FIG. 1 , a circulation line 24 is provided on the exhaust line 18 so as to branch from the exhaust line 18 . This circulation line 24 is used to supply a part of the exhaust gas 14 in the exhaust line 18 to the main engine 12 . One end portion of the circulation line 24 on the side connected to the exhaust line 18 is formed as a branch portion 25 provided at the outlet of the turbine unit 20 and the inlet portion of the scrubber 21 for exhaust gas in the exhaust line 18 . between. Therefore, the exhaust gas scrubber 21 is provided on the downstream side of the flow direction of the exhaust gas 14 from the branch portion 25 .

Furthermore, the other end of the circulation line 24 is connected to a fresh air introduction port (new introduction line 27 ) in front of the compressor unit 22 . Therefore, the exhaust gas 14 (exhaust gas for circulation (hereinafter referred to as “EGR gas”)) introduced through the circulation line 24 is supplied to each cylinder 15 through the intake manifold 16 . Further, a scrubber 26 for circulation and a compressor unit 22 of the exhaust turbocharger 19 are provided on the circulation line 24 .

The circulation scrubber 26 is used to purify the EGR gas 14 supplied to the main engine 12 again. That is, the circulation scrubber 26 is a device for removing substances harmful to the main engine 12 contained in the exhaust gas 14 . According to the scrubber 26 for circulation, sulfur oxides, powdery particles, and the like in the exhaust gas 14 can be captured in droplets or a liquid film of the cleaning liquid, and separated.

Also, the compressor unit 22 of the exhaust turbocharger 19 is configured to introduce the EGR gas 14 and fresh air into its inlet, and compress the EGR gas 14 and fresh air. Then, the compressed EGR gas 14 and fresh air are supplied to each cylinder 15 through an intake manifold 16 .

In this way, by mixing fresh air into the EGR gas 14 and supplying the mixed gas to each cylinder 15 , the oxygen concentration in the mixed gas can be adjusted to a value suitable for combustion in each cylinder 15 . The appropriate combustion refers to combustion capable of suppressing the generation of nitrogen oxides below a certain standard and generating power with a thermal efficiency above a certain standard. In addition, although not shown, a split flow rate adjustment valve for adjusting the split flow rate of the EGR gas 14 is provided on the circulation line 24 .

Next, the circulating fluid purification device 29 shown in FIG. 1 will be described. The circulating fluid purification device 29 is used to purify the circulating fluid 28 (for example, water) used by the exhaust gas scrubber 21 and the circulation scrubber 26 to purify the exhaust gas 14 . The circulating liquid purification device 29 includes a circulating liquid tank 30 , a centrifugal separator 31 , a waste tank 32 , and a chemical tank 33 .

The circulating liquid tank 30 is connected to the exhaust scrubber 21 through a first circulating liquid line 34 (first circulating liquid pipe) having a first liquid discharge pipe 35 and a first liquid supply pipe 36 . The first liquid discharge pipe 35 is used to transfer the polluted circulating liquid 28 in the exhaust scrubber 21 to the circulating liquid tank 30, and the first liquid supply pipe 36 is used to transfer the circulating liquid 28 purified in the circulating liquid tank 30. to exhaust scrubber 21.

Further, this circulating liquid tank 30 is connected to the circulating scrubber 26 through a second circulating liquid line 37 (second circulating liquid pipe) having a second liquid discharge pipe 38 and a second liquid supply pipe 39 . The second liquid discharge pipe 38 is used to transfer the polluted circulating liquid 28 in the circulating scrubber 26 to the circulating liquid tank 30, and the second liquid supply pipe 39 is used to transfer the circulating liquid 28 purified in the circulating liquid tank 30. To the recycling scrubber 26.

Furthermore, the circulating liquid tank 30 is connected to the centrifugal separator 31 through a third circulating liquid line 40 (third circulating liquid pipe) having a third liquid discharge pipe 41 and a third liquid supply pipe 42 . The third liquid discharge pipe 41 is used to transfer the polluted circulating liquid 28 in the circulating liquid tank 30 to the centrifugal separator 31, and the third liquid supply pipe 42 is used to transfer the purified circulating liquid 28 in the centrifugal separator 31 to the circulating liquid. In the tank 30.

In addition, the centrifugal separator 31 can separate the polluted circulating fluid 28 into the polluted circulating fluid 28 and waste, and is connected to the waste tank 32 through the waste discharge pipe 43 . The waste discharge pipe 43 is used to transfer the waste in the centrifugal separator 31 to the waste tank 32 .

Furthermore, the circulating liquid tank 30 is connected to the chemical tank 33 through a chemical supply pipe 44 for supplying the chemical in the chemical tank 33 to the circulating liquid tank 30 . This agent is used for pH adjustment of the purified circulating liquid 28 in the circulating liquid tank 30, for example caustic soda water.

Furthermore, in this embodiment, as shown in FIG. 1 , the circulating liquid tank 30 , the centrifugal separator 31 , the waste tank 32 , and the chemical tank 33 are all shared by both the exhaust scrubber 21 and the circulation scrubber 26 . Structure.

According to the circulating liquid purifying device 29 configured as above, the circulating liquid 28 contaminated by the exhaust gas scrubber 21 and the circulating scrubber 26 for the purpose of purifying the exhaust gas 14 is discharged from the circulating liquid tank 30 and the centrifugal separator. 31 , and the waste separated in the centrifugal separator 31 is stored in the waste tank 32 , and the chemical supplied from the chemical tank 33 is used to adjust the pH of the purified circulating fluid 28 .

Furthermore, by forming the circulation liquid tank 30, the centrifugal separator 31, the waste tank 32, and the chemical tank 33 in such a structure that both the exhaust scrubber 21 and the circulation scrubber 26 are shared, it is possible to achieve exhaustion. Reduction in the volume (size and weight) and cost of the entire gas purification device 13 .

Next, the operation of the exhaust purification device 13 configured as described above and the marine engine system 11 including the exhaust purification device will be described. According to the ship engine system 11 shown in FIG. 1 , the exhaust gas 14 discharged from the main engine 12 for the ship and passed through the exhaust line 18 can be purified by the exhaust scrubber 21 to the purification standard of the degree that can be discharged into the atmosphere. Exhaust to atmosphere. Furthermore, the EGR gas 14 passing through the circulation line 24 branched from the exhaust line 18 can be purified by the circulation scrubber 26 to a level of purification capable of being supplied to the marine main engine 12 and then supplied to the marine main engine 12 . In addition, by mixing the circulating gas with the fresh air through the circulation line 24, the EGR gas 14 having a lower oxygen concentration than air is supplied to the marine main engine 12, thereby suppressing nitrogen oxides in the marine main engine 12. generation. With this, it is possible to reduce the concentration (content rate) of nitrogen oxides in the exhaust gas 14 discharged into the atmosphere.

In addition, according to the ship engine system 11, the exhaust gas 14 discharged into the atmosphere is cleaned by the exhaust scrubber 21, and the exhaust gas 14 supplied to the main engine 12 for the ship is cleaned by the circulation scrubber 26. This can be based on the required purification standard, the type of air pollutants to be purified and its amount (volume, weight), and the amount (volume, weight) of the exhaust gas 14 to be purified. The respective purification treatment functions and capabilities of the scrubber 26, etc. Thereby, the quantity (size and weight) of the exhaust purification device 13 as a whole can be reduced, and the cost of the exhaust purification device 13 can be reduced.

Furthermore, when the exhaust gas purification device 13 is applied to a ship, the amount of material in the engine room can be reduced, thereby reducing the weight of the ship. As a result, the ship's cargo tonnage (ability to carry cargo) can be increased.

In addition, since the volume of the entire exhaust purification device 13 can be reduced, the size of the ship can be reduced. With this, water resistance can be reduced, and fuel consumption can be reduced.

In addition, the circulation scrubber 26 shown in FIG. 1 has a higher level of purification of the exhaust gas 14 than the exhaust scrubber 21 . That is, this embodiment is formed considering that the purification standard required for the EGR gas 14 (exhaust gas) supplied to the marine main engine 12 is higher than that required for the exhaust gas 14 discharged into the atmosphere. Therefore, it is reasonable to set the exhaust gas scrubber 21 in such a manner that it can purify the exhaust gas 14 to a purification standard that can be discharged into the atmosphere and discharge it to the atmosphere. Furthermore, it is reasonable that the circulation scrubber 26 can be set in such a manner that it can purify the exhaust gas 14 to a purification standard that can be supplied to the marine main engine 12 and then supply it to the marine main engine 12 .

Specifically, the purification standard JK required for the EGR gas 14 supplied to the ship's main engine 12 (such as the degree of removal of powdery and granular substances such as black smoke contained in the exhaust gas 14) is higher than that required for the exhaust gas 14 discharged into the atmosphere. The required purification standard JT, therefore, in the exhaust purification device 13 shown in FIG. Therefore, the amount (size, weight) and cost of the exhaust purification device 13 can be reduced accordingly.

Furthermore, the scrubber 21 for exhaust gas is used to mainly remove sulfur oxides in the exhaust gas 14 , and the scrubber 26 for circulation is used to remove sulfur oxides and particulate matter in the exhaust gas 14 . According to such a configuration, the purification treatment capacity of the exhaust gas scrubber 21 can be appropriately set according to, for example, the content rate of sulfur oxides in the exhaust gas 14 that is allowed to be discharged into the atmosphere. In addition, for example, the purification treatment capability of the circulation scrubber 26 can be appropriately set according to the content rate of the particulate matter in the exhaust gas 14 that is allowed to be supplied to the main engine 12 for a ship. With this, it is possible to reduce the amount (size and weight) of the entire exhaust purification device 13 .

Moreover, as shown in FIG. 1 , the scrubber 21 for exhaust gas is provided on the downstream side of the flow direction of the exhaust gas 14 from the branch portion 25 where the circulation line 24 diverges from the exhaust line 18 .

In this way, as long as the exhaust scrubber 21 is equipped with the exhaust gas 14 that can purify the remaining flow after subtracting the EGR gas flow rate (circulation exhaust gas flow rate) branched to the circulation line 24 from the exhaust gas 14 discharged from the ship main engine 12 The purification treatment capability of the exhaust gas can be reduced, and the size of the scrubber 21 for exhaust gas can be achieved.

Next, a second embodiment of the ship engine system according to the present invention will be described with reference to FIG. 2 . The ship engine system 46 of the second embodiment shown in FIG. 2 is different from the ship engine system 11 of the first embodiment shown in FIG. 1 in that in the first embodiment shown in FIG. The branch portion 25 where the exhaust line 18 diverges is provided on the downstream side of the flow direction of the exhaust gas 14 compared to the scrubber 21 for exhaust gas. On the other hand, in the second embodiment shown in FIG. The branch portion 25 where the exhaust line 18 branches is provided on the upstream side of the flow direction of the exhaust gas 14 from the scrubber 21 for exhaust gas.

Otherwise, it has the same structure as the first embodiment and exerts the same functions, so the same reference numerals are assigned to the same parts, and detailed description thereof will be omitted.

In this way, when all the exhaust gas 14 discharged from the ship main engine 12 is purified by the exhaust scrubber 21, the exhaust gas circulated to the ship main engine 12 can be purified using both the exhaust scrubber 21 and the circulation scrubber 26. 14. With this, the circulation scrubber 26 can be miniaturized, and the amount (size and weight) of the exhaust purification device 13 as a whole can be reduced.

Next, a third embodiment of the ship engine system according to the present invention will be described with reference to FIG. 3 . The difference between the ship engine system 48 of the third embodiment shown in FIG. 3 and the ship engine system 11 of the first embodiment shown in FIG. 1 is as follows.

The first embodiment shown in Fig. 1 is that the scrubber 21 for exhaust and the scrubber 26 for circulation are set independently, and the first circulating liquid line 34 is set on the scrubber 21 for exhaust, and the scrubber 26 for circulation The structure of the second circulating liquid line 37 is provided.

In contrast, in the third embodiment shown in FIG. 3 , the scrubber 21 for exhaust gas and the scrubber 26 for circulation are formed as an integrated scrubber 49 , and the integrated scrubber 49 is connected to the circulation through a common circulation liquid line 50 . The liquid tanks 30 are connected, and the circulating liquid 28 can be circulated in the same manner as the circulating liquid lines 34 and 37 of the first embodiment through the common drain pipe 51 and the common liquid supply pipe 52 constituting the common circulating liquid line 50 . In addition, the exhaust gas 14 is branched at the branch portion 25 of the exhaust line 18 and the circulation line 24 inside the integrated scrubber 49, and is purified to the purification standards JT and JK required for each line.

Otherwise, it has the same configuration as the first embodiment and exerts the same functions, so the same reference numerals are assigned to the same parts, and detailed description thereof will be omitted.

In this way, by forming the integrated scrubber 49 including the exhaust scrubber 21 and the circulation scrubber 26 and using the common circulation liquid line 50, the circulation liquid line can be simplified and the overall reduction can be achieved. By reducing the liquid volume of the circulating fluid 28 in the circulating liquid line, further reductions in the volume and cost of the exhaust purification device 48 as a whole can be achieved.

Next, a fourth embodiment of the ship engine system according to the present invention will be described with reference to FIG. 4 . The differences between the ship engine system 54 of the fourth embodiment shown in FIG. 4 and the ship engine system 11 of the first embodiment shown in FIG. 1 are as follows.

In the first embodiment shown in FIG. 1 , the bifurcated portion 25 is arranged between the turbine portion 20 on the exhaust line 18 and the exhaust scrubber 21, and the exhaust gas 14 entering through the bifurcated portion 25 is circulated. The scrubber 26 cleans and compresses the cleaned exhaust gas 14 and fresh air by the compressor unit 22 , and supplies the compressed mixed gas to each cylinder 15 .

On the other hand, in the fourth embodiment shown in FIG. 4 , a bifurcated portion 25 is provided between the exhaust manifold 17 of the exhaust line 18 and the turbine portion 20, and the exhaust gas 14 entering through the bifurcated portion 25 is The exhaust gas 14 is purified by the scrubber 26 for circulation, and the purified exhaust gas 14 is compressed by a separate compressor 55 , and then the compressed EGR gas 14 is supplied to each cylinder 15 . Further, the fresh air is compressed by the compressor unit 22 , and the compressed fresh air and the purified compressed EGR gas 14 are combined in the intake manifold 16 and supplied to the cylinders 15 .

Otherwise, it has the same structure as the first embodiment and exerts the same functions, so the same reference numerals are assigned to the same parts, and detailed description thereof will be omitted.

According to the fourth embodiment configured as described above, since the compressor unit 22 for compressing the fresh air and the compressor 55 for compressing the EGR gas 14 are provided independently, it is not necessary to pass the EGR gas 14 . The compressor part 22 can prevent the compressor part 22 from being affected by the EGR gas 14 and being affected by the EGR gas 14, and the pollutants are attached to the compressor part 22 to prevent performance degradation.

Next, a fifth embodiment of the ship engine system according to the present invention will be described with reference to FIG. 5 . The ship engine system 57 of the fifth embodiment shown in FIG. 5 is different from the ship engine system 54 of the fourth embodiment shown in FIG. 4 in that the circulating fluid purification device 29 is different.

The circulating fluid purifying device 29 of the fourth embodiment shown in FIG. shared structure.

In contrast, the circulating fluid purification devices 29 and 29 according to the fifth embodiment shown in FIG. The structure is provided in a form dedicated to the washer 21 and the circulation scrubber 26.

Otherwise, it has the same structure as the first embodiment and exerts the same functions, so the same reference numerals are assigned to the same parts, and detailed description thereof will be omitted.

According to the fifth embodiment constituted as above, as described in each of the above-mentioned embodiments, it can be based on the required purification standard, the type and amount (volume, weight) of the air pollutant to be purified, and the purified air pollutant. The amount (volume, weight) of the exhaust gas 14 sets the respective purification processing functions, capabilities, and the like of the exhaust gas scrubber 21 and the circulation scrubber 26 . With this, the volume (size and weight) of the scrubbers 21 and 26 of the exhaust purification device 58 can be reduced, and the cost of the scrubbers 21 and 26 can be reduced.

However, in the above-mentioned embodiment, for example, as shown in FIG. However, it may be replaced by a structure in which any one of them is shared by both the scrubbers 21 and 26 .

Industrial applicability:

As described above, the exhaust gas purification device according to the present invention and the marine engine system equipped with the exhaust gas purification device have the excellent advantage of being able to reduce the overall material quantity (size and weight) of the exhaust gas purification device, thereby achieving cost reduction. effect, and thus is applicable to such an exhaust purification device and a ship engine system equipped with the exhaust purification device.

Symbol Description:

11 Ship engine system;

12 main engine for ships;

13 Exhaust purification device;

14 Exhaust, EGR gas;

15 cylinders;

16 intake manifold;

17 exhaust manifold;

18 exhaust line;

19 Exhaust turbocharger;

20 Turbine Department;

21 exhaust scrubber;

22 Compressor Department;

23 axis of rotation;

24 loop lines;

25 fork;

26 Scrubbers for circulation;

27 Fresh air introduction line;

28 circulating fluid;

29 Circulating fluid purification device;

30 Circulating liquid tank;

31 centrifugal separator;

32 waste chute;

33 medicine tank;

34 The first circulating liquid line;

35 The first discharge pipe;

36 The first liquid supply pipe;

37 Second circulation liquid line;

38 the second discharge pipe;

39 the second liquid supply pipe;

40 The third circulation liquid line;

41 The third discharge pipe;

42 The third liquid supply pipe;

43 waste discharge pipe;

44 drug supply tube;

46, 48 Ship engine system;

49 Integrated scrubber;

50 shared circulation liquid line;

51 common discharge pipe;

52 common liquid supply pipe;

54 Ship engine system;

55 compressor;

57 Ship engine system;

58 Exhaust purification device.

Claims (8)

1. An exhaust purification device, It is an exhaust gas purification device for reducing and removing air pollutants in exhaust gas discharged from a main engine of a ship, and is characterized in that it includes: An exhaust line that is connected to the main engine for the ship and is used to discharge the exhaust gas discharged from the main engine for the ship to the atmosphere; A circulation line for resupplying part of the exhaust gas in the exhaust line to the main engine for ships is provided in a form of branching from the exhaust line; an exhaust gas scrubber provided on the exhaust line for purifying exhaust gas discharged into the atmosphere; and A scrubber for circulation is installed on the circulation line to purify the exhaust gas that is supplied again to the main engine for the ship. 2 . The exhaust gas purification device according to claim 1 , wherein the circulation scrubber purifies exhaust gas at a higher level than the exhaust gas scrubber. 3 . 3. The exhaust purification device according to claim 1 or 2, characterized in that, The exhaust gas scrubber is used to remove sulfur oxides in the exhaust gas; The scrubber for circulation is used to remove sulfur oxides and powdery particles in the exhaust gas. 4. The exhaust purification device according to any one of claims 1 to 3, characterized in that, The scrubber for exhaust gas and the scrubber for circulation use circulating fluid to clean the exhaust gas, the circulating fluid is purified in the circulating fluid tank and the centrifugal separator, and the waste separated in the centrifugal separator is stored in In the waste tank, the pH of the circulating liquid is adjusted using the chemical supplied from the chemical tank; Any one or all of the circulating liquid tank, the centrifugal separator, the waste tank, and the chemical tank are shared by both the exhaust scrubber and the circulation scrubber. 5. The exhaust gas purification device according to any one of claims 1 to 4, wherein the exhaust gas scrubber is smaller than the branch portion where the circulation line diverges from the exhaust line. Installed on the downstream side of the exhaust gas flow. 6. The exhaust purification device according to any one of claims 1 to 4, wherein said exhaust scrubber Installed on the upstream side of the exhaust gas flow. 7. The exhaust purification device according to any one of claims 4 to 6, characterized in that, the exhaust scrubber and the circulation scrubber form an integrated scrubber, and the integrated scrubber A bifurcation portion where the circulation line diverges from the exhaust line is provided in the scrubber, and the integrated scrubber is connected to the circulation liquid tank through a common circulation liquid line. 8. A marine engine system, characterized by comprising the exhaust purification device according to any one of claims 1 to 7.