JP2014055567A - Exhaust emission control system and ship engine system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust gas purification device capable of reducing the amount (bulk and weight) of the exhaust gas purification device as a whole and thereby reducing the cost.
SOLUTION: In an exhaust gas purification device 13 for reducing and removing air pollutants in exhaust gas 14 discharged from a marine main engine 12, the exhaust gas exhausted from the marine main engine 12 is connected to the marine main engine 12. An exhaust line 18 for discharging the gas 14 to the atmosphere, and a circulation for recharging the part of the exhaust gas 14 in the exhaust line 18 to the marine main engine 12 are provided so as to branch from the exhaust line 18. Exhaust scrubber 21 for purifying exhaust gas 14 provided in line 24 and exhaust line 18 and exhausted into the atmosphere, and exhaust gas provided in circulation line 24 and re-supplied to marine main engine 12 And a scrubber for circulation 26 for purifying 14.
[Selection] Figure 1

Description

  The present invention relates to an exhaust gas purification device applied to, for example, a diesel engine that is a marine main engine, and a marine engine system including the same.

  Regarding exhaust gas discharged from marine main engines, exhaust gas regulations regarding air pollutants such as sulfur oxides (SOx) and nitrogen oxides (NOx) are being strengthened. For this reason, an exhaust gas purification device that reduces and removes sulfur oxides (SOx) and nitrogen oxides (NOx) in the exhaust gas discharged from the marine main engine is provided (see, for example, Patent Document 1). .

  The exhaust gas purification device includes an exhaust gas cleaning device and an exhaust gas recirculation device. This exhaust gas cleaning device is provided in an exhaust line of a marine main engine and is configured to clean the entire amount of exhaust gas. The exhaust gas recirculation device supplies a part of the exhaust gas cleaned by the exhaust gas cleaning device to the marine main engine again as exhaust gas for recirculation.

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

  And according to the exhaust gas recirculation device, the recirculation exhaust gas having a lower oxygen concentration than air is supplied to the marine main engine again, thereby suppressing the generation of nitrogen oxides in the marine main engine. it can.

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

2012-47056

  However, the purification level JK required for the exhaust gas supplied to the marine main engine (for example, the extent to which sulfur oxides and particulate matter contained in the exhaust gas are removed) is the exhaust gas discharged into the atmosphere. However, in the conventional exhaust gas purification device, the purification level JT of exhaust gas discharged into the atmosphere is set to a value that is higher than the purification level JT required (for example, emission control values set by international treaties). Since the exhaust gas supplied to the marine main engine is raised to the purification level JK required for the exhaust gas, the quantity (bulk, weight) and cost of the exhaust gas cleaning device increase accordingly.

  For this reason, when such a conventional exhaust gas purification device is employed in a ship, the amount of material in the engine room increases, thereby reducing the ship cargo space and increasing the ship weight. As a result, there is a problem that the tonnage (capacity to carry luggage) of the ship is reduced.

  Further, when the amount of the exhaust gas purification device as a whole increases, the ship becomes larger, thereby increasing water resistance and increasing fuel consumption.

  The present invention has been made to solve the above-described problems, and reduces the amount (bulk and weight) of the exhaust gas purification device as a whole, thereby reducing the cost. It aims at providing a purification apparatus and a ship engine system provided with the same.

  An exhaust gas purification apparatus according to the present invention is an exhaust gas purification apparatus that reduces and removes air pollutants in exhaust gas discharged from a marine main engine. The exhaust gas purification apparatus is connected to the marine main engine and discharged from the marine main engine. An exhaust line for discharging the exhaust gas to the atmosphere, and a circulation line for branching from the exhaust line and recharging a part of the exhaust gas in the exhaust line to the marine main engine And an exhaust scrubber provided in the exhaust line for purifying exhaust gas discharged into the atmosphere, and an exhaust gas provided in the circulation line and re-supplied to the marine main engine. And a scrubber for circulation.

  According to the exhaust gas purification apparatus according to the present invention, exhaust gas discharged from a marine main engine and passing through an exhaust line is purified to a purification level that can be discharged into the atmosphere by an exhaust scrubber and discharged into the atmosphere. Can do. The exhaust gas passing through the circulation line branched from the exhaust line can be purified by a circulation scrubber to a purification level that can be supplied to the marine main engine and supplied to the marine main engine. Further, by supplying exhaust gas having a lower oxygen concentration than air to the marine main engine through the circulation line, generation of nitrogen oxides in the marine main engine can be suppressed. Thereby, it is possible to reduce the nitrogen oxide concentration (content rate) in the exhaust gas discharged to the atmosphere.

  In the exhaust gas purifying apparatus according to the present invention, the circulating scrubber may have a higher level of purifying exhaust gas than the exhaust scrubber.

  The present invention has been made in view of the fact that the purification level required for the exhaust gas supplied to the marine main engine is higher than the purification level required for the exhaust gas discharged into the atmosphere. . Therefore, the exhaust scrubber is rational because it can be set so that the exhaust gas can be purified to a purification level that can be discharged into the atmosphere and discharged into the atmosphere. The circulation scrubber is rational because it can be set so that the exhaust gas can be purified to a purification level capable of supplying the marine main engine and supplied to the marine main engine.

  In the exhaust gas purifying apparatus according to the present invention, the exhaust scrubber is for removing sulfur oxides in the exhaust gas, and the circulation scrubber is configured to remove sulfur oxides and particulate matter in the exhaust gas. It should be for removal.

  If comprised in this way, the purification | cleaning processing capability of the scrubber for exhaust_gas | exhaustion can be set appropriately according to the content rate of the sulfur oxide in the exhaust gas in which discharge | emission to air | atmosphere is permitted, for example. And the purification | cleaning processing capacity of the scrubber for circulation can be appropriately set according to the content rate of the sulfur oxide and the particulate matter in the exhaust gas permitted, for example, for supplying air to the marine main engine. As a result, the amount (bulk and weight) of the exhaust gas purification device as a whole can be reduced.

  In the exhaust gas purification apparatus according to the present invention, the exhaust scrubber and the circulation scrubber use a circulating fluid to purify the exhaust gas, and the circulating fluid is purified by a circulating fluid tank and a centrifuge. The waste separated by the centrifuge is stored in a waste tank, and the chemical supplied from the chemical tank is used to adjust the pH of the circulating liquid. The circulating liquid tank, the centrifuge, Any or all of the waste tank and the chemical tank may be shared by both the exhaust scrubber and the circulation scrubber.

  As described above, the exhaust gas purification device is configured such that either or all of the circulating liquid tank, the centrifuge, the waste tank, and the chemical tank are shared by both the exhaust scrubber and the circulation scrubber. It is possible to further reduce the amount (bulk and weight) and cost as a whole.

  In the exhaust gas purifying apparatus according to the present invention, the exhaust scrubber may be provided on the downstream side of the flow of the exhaust gas from a branch portion where the circulation line branches from the exhaust line.

  In this way, the exhaust scrubber can purify the exhaust gas of the remaining flow rate obtained by subtracting the circulating exhaust gas flow rate diverted to the circulation line from the exhaust gas discharged from the marine main engine. The exhaust scrubber can be reduced in size.

  In the exhaust gas purifying apparatus according to the present invention, the exhaust scrubber may be provided upstream of the flow of the exhaust gas from a branch portion where the circulation line branches from the exhaust line.

  Thus, when the exhaust gas scrubber is used to purify the total amount of exhaust gas discharged from the marine main engine, the exhaust gas supplied to the marine main engine again is supplied to both the exhaust scrubber and the circulation scrubber. Can be purified using. Thereby, the scrubber for circulation can be reduced in size, and the amount and cost can be reduced.

  In the exhaust gas purifying apparatus according to the present invention, the exhaust scrubber and the circulation scrubber are formed as an integrated scrubber, and a branching portion for branching the circulation line from the exhaust line is provided in the integrated scrubber, The integrated scrubber and the circulating fluid tank may be connected to each other through a shared circulating fluid line.

  As described above, the integrated scrubber including the exhaust scrubber and the circulation scrubber uses the common circulating fluid line, whereby the circulating fluid line can be simplified and the circulating fluid in the circulating fluid line can be simplified. As a whole, the amount of liquid and the cost of the exhaust gas purification device as a whole can be further reduced.

  A marine engine system according to the present invention includes the exhaust gas purifying apparatus 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, and this exhaust gas purification device can exhibit the same operation as described above.

  According to the exhaust gas purifying apparatus and the ship engine system according to the present invention, the exhaust gas discharged into the atmosphere is purified by the exhaust scrubber, and the exhaust gas supplied to the marine main engine is purified by the circulation scrubber. As a result, the exhaust scrubber and circulation depending on the required purification level, 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. Each scrubber purification function and ability can be set. Accordingly, it is possible to reduce the amount (bulk and weight) of the exhaust gas purification device as a whole, and it is possible to reduce the cost of the exhaust gas purification device.

  If an exhaust gas purification device or a ship engine system is adopted in a ship, the amount of material in the engine room can be reduced, thereby increasing the ship cargo space or reducing the ship weight. As a result, it is possible to increase the cargo weight ton (capability to carry luggage) of the ship.

  Moreover, since the quantity of the exhaust gas purification device as a whole can be reduced, the ship can be downsized. Thereby, the resistance of water can be reduced, and the fuel consumption can be reduced.

It is a lineblock diagram showing the ship engine system concerning a 1st embodiment of this invention. It is a block diagram which shows the ship engine system which concerns on 2nd Embodiment of the invention. It is a block diagram which shows the ship engine system which concerns on 3rd Embodiment of the same invention. It is a block diagram which shows the ship engine system which concerns on 4th Embodiment of the invention. It is a block diagram which shows the ship engine system which concerns on 5th Embodiment of the invention.

  Hereinafter, an exhaust gas purifying apparatus according to the present invention and a ship engine system including the same will be described with reference to FIG. A marine engine system 11 shown in FIG. 1 is provided with an exhaust gas purifying device 13 in a marine main engine 12. The exhaust gas purifying device 13 includes sulfur contained in the exhaust gas 14 of a main engine (for example, a diesel engine) that serves as a marine main engine 12 (hereinafter also simply referred to as “main engine”) for marine propulsion. This device reduces and removes air pollutants (toxic substances) such as oxides and nitrogen oxides.

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

  The main engine 12 includes a plurality of cylinders 15, an air supply 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 supply air supplied from the supply manifold 16. Therefore, in the main engine 12, the thermal energy held by the fuel is converted into the output of the main engine 12 and combustion is performed. The exhaust gas 14 is generated.

  The exhaust gas 14 generated in each cylinder 15 is collected in an exhaust manifold 17. An exhaust line 18 is connected to the exhaust manifold 17. The exhaust line 18 is for exhausting the exhaust gas 14 collected in the exhaust manifold 17 to the atmosphere through a chimney. The exhaust line 18 is provided with a turbine section 20 of an exhaust turbine supercharger 19 and an exhaust scrubber 21.

  The exhaust turbine supercharger 19 rotates the turbine unit 20 at high speed using the energy (kinetic energy and thermal energy) possessed by the exhaust gas 14 and rotationally drives the compressor unit 22 with the rotational force to supply air. This is a device for compressing (exhaust gas 14). In addition, the code | symbol 23 in a figure is a rotating shaft which connects the turbine part 20 and the compressor part 22 mutually.

  The exhaust scrubber 21 is for purifying the exhaust gas 14 discharged into the atmosphere. That is, the exhaust scrubber 21 is an apparatus for removing air pollutants (hazardous substances) contained in the exhaust gas 14. According to the exhaust scrubber 21, it is possible to collect and separate the particulate matter such as sulfur oxides and soot as the air pollutants in the exhaust gas 14 in the droplets or liquid film of the cleaning liquid. Since the exhaust gas 14 to be processed by the exhaust scrubber 21 has passed through the turbine section 20 of the exhaust turbine supercharger 19, the pressure decreases and the temperature slightly decreases. Therefore, the exhaust scrubber 21 is less affected by the exhaust gas 14 and can maintain high reliability and durability.

  As shown in FIG. 1, the exhaust line 18 is provided with a circulation line 24 so as to branch from the exhaust line 18. The circulation line 24 is for supplying 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, and the branch portion 25 is connected to the outlet of the turbine portion 20 and the inlet portion of the exhaust scrubber 21 in the exhaust line 18. It is provided between. Therefore, the exhaust scrubber 21 is provided downstream of the branch portion 25 in the flow of the exhaust gas 14.

  The other end of the circulation line 24 is connected to a fresh air inlet (new introduction line 27) before the compressor unit 22. Therefore, the exhaust gas 14 (circulation exhaust gas (hereinafter referred to as “EGR gas”)) guided by the circulation line 24 is supplied to each cylinder 15 via the supply manifold 16. The circulation line 24 is provided with a circulation scrubber 26 and a compressor unit 22 of the exhaust turbine supercharger 19.

  The circulation scrubber 26 is for purifying the EGR gas 14 re-supplied to the main engine 12. That is, the circulation scrubber 26 is an apparatus for removing substances harmful to the main engine 12 contained in the exhaust gas 14. According to this circulation scrubber 26, sulfur oxides, particulate matter, and the like in the exhaust gas 14 can be collected and separated in cleaning liquid droplets or a liquid film.

  Further, the compressor section 22 of the exhaust turbine supercharger 19 is configured such that fresh air is introduced together with the EGR gas 14 into the inlet portion thereof, and the EGR gas 14 and the fresh air are compressed. 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 with the EGR gas 14 and supplying the mixed gas to each cylinder 15, the oxygen concentration in the mixed gas is adjusted to a value suitable for combustion in each cylinder 15. be able to. This appropriate combustion refers to combustion in which the generation of nitrogen oxides can be suppressed below a certain standard, and power is generated with a thermal efficiency that is above a certain standard. Although not shown in the drawing, the circulation line 24 is provided with a branch flow rate adjusting valve for adjusting the branch flow rate of the EGR gas 14.

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

  The circulating fluid tank 30 is connected to the exhaust scrubber 21 via a first circulating fluid line 34 (first circulating fluid pipe). The first circulating fluid line 34 is connected to the first drain pipe 35 and the first drain fluid pipe 35. 1 liquid supply pipe 36. The first drain pipe 35 is for transferring the dirty circulating liquid 28 in the exhaust scrubber 21 to the circulating liquid tank 30, and the first liquid supply pipe 36 is purified in the circulating liquid tank 30. The circulating fluid 28 is transferred to the exhaust scrubber 21.

  The circulating fluid tank 30 is connected to the circulating scrubber 26 via a second circulating fluid line 37 (second circulating fluid pipe). The second circulating fluid line 37 is connected to a second drain pipe 38. And a second liquid supply pipe 39. The second drain pipe 38 is for transferring the dirty circulating liquid 28 in the circulation scrubber 26 to the circulating liquid tank 30, and the second liquid supply pipe 39 is purified in the circulating liquid tank 30. The circulating liquid 28 is transferred to the circulation scrubber 26.

  The circulating fluid tank 30 is connected to the centrifuge 31 via the third circulating fluid line 40 (third circulating fluid pipe). The third circulating fluid line 40 has a third drainage pipe 41 and a third liquid supply pipe 42. The third drain pipe 41 is for transferring the dirty circulating liquid 28 in the circulating liquid tank 30 to the centrifuge 31, and the third liquid supply pipe 42 is purified in the centrifuge 31. This is for transferring the circulating fluid 28 to the circulating fluid tank 30.

  Furthermore, the centrifugal separator 31 can separate the dirty circulating fluid 28 into the circulating fluid 28 from which the dirt has been removed and the waste, and is connected to the waste tank 32 via the waste discharge pipe 43. doing. The waste discharge pipe 43 is for transferring waste in the centrifuge 31 to the waste tank 32.

  The circulating fluid tank 30 is connected to the medicine tank 33 via the medicine supply pipe 44, and the medicine supply pipe 44 is for supplying the medicine in the medicine tank 33 to the circulating liquid tank 30. . This chemical is used to adjust the pH of the purified circulating fluid 28 in the circulating fluid tank 30, and is, for example, caustic soda water.

  In this embodiment, as shown in FIG. 1, the circulating liquid tank 30, the centrifuge 31, the waste tank 32, and the chemical tank 33 are all shared by both the exhaust scrubber 21 and the circulation scrubber 26. It is configured to be.

  According to the circulating fluid purifying device 29 configured as described above, the circulating fluid 28 used for purifying the exhaust gas 14 in the exhaust scrubber 21 and the circulating scrubber 26 is separated from the circulating fluid tank 30 and the centrifugal separator. The waste purified by the machine 31 and separated by the centrifuge 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. Is done.

  And by making all the circulating liquid tank 30, the centrifuge 31, the waste tank 32, and the chemical | medical agent tank 33 share in this way by both the exhaust scrubber 21 and the circulation scrubber 26, exhaust gas The amount (bulk and weight) and cost of the purification device 13 as a whole can be reduced.

  Next, the operation of the exhaust gas purification device 13 configured as described above and the marine engine system 11 including the exhaust gas purification device 13 will be described. According to the marine engine system 11 shown in FIG. 1, the exhaust gas 14 discharged from the marine main engine 12 and passing through the exhaust line 18 is purified by the exhaust scrubber 21 to a purification level that can be discharged into the atmosphere. Can be discharged inside. Then, the EGR gas 14 passing through the circulation line 24 branched from the exhaust line 18 is purified by a circulation scrubber 26 to a purification level that can be supplied to the marine main engine 12 and supplied to the marine main engine 12. it can. Further, by mixing the circulating gas with fresh air via the circulation line 24, the EGR gas 14 having a lower oxygen concentration than air is supplied to the marine main engine 12, so that the nitrogen oxides in the marine main engine 12 are supplied. Generation can be suppressed. Thereby, it is possible to reduce the nitrogen oxide concentration (content rate) in the exhaust gas 14 discharged to the atmosphere.

  Moreover, according to this ship engine system 11, the exhaust gas 14 discharged | emitted in air | atmosphere is purified with the exhaust scrubber 21, and the exhaust gas 14 supplied to the ship main engine 12 is purified with the circulation scrubber 26. As a result, the exhaust scrubber 21 depends on the required purification level, the type and amount (volume, weight) of the air pollutant to be purified, and the amount (volume, weight) of the exhaust gas 14 to be purified. And each purification processing function and capability of the circulation scrubber 26 can be set. Thereby, the amount (bulk and weight) of the exhaust gas purification device 13 as a whole can be reduced, and the cost of the exhaust gas purification device 13 can be reduced.

  When the exhaust gas purifying device 13 is employed in a ship, the amount of material in the engine room can be reduced, thereby reducing the weight of the ship. As a result, it is possible to increase the cargo weight ton (capability to carry luggage) of the ship.

  Moreover, since the quantity of the exhaust gas purification device 13 as a whole can be reduced, the ship can be downsized. Thereby, the resistance of water can be reduced, and the fuel consumption can be reduced.

  Furthermore, the circulation scrubber 26 shown in FIG. 1 has a higher level of purifying the exhaust gas 14 than the exhaust scrubber 21. That is, in this embodiment, the purification level required for the EGR gas 14 (exhaust gas) supplied to the marine main engine 12 is higher than the purification level required for the exhaust gas 14 discharged into the atmosphere. It was made in view of the high price. Therefore, the exhaust scrubber 21 can be set so that the exhaust gas 14 can be purified to a purification level capable of being discharged into the atmosphere and discharged into the atmosphere. The circulation scrubber 26 is rational because it can be set so that the exhaust gas 14 can be purified to a purification level capable of supplying air to the marine main engine 12 and supplied to the marine main engine 12. is there.

  More specifically, the purification level JK required for the EGR gas 14 supplied to the marine main engine 12 (e.g., the extent to which particulate matter such as soot contained in the exhaust gas 14 is removed) 1 is higher than the purification level JT required for the exhaust gas 14 discharged into the interior, the exhaust gas purification device 13 shown in FIG. 1 sets the purification level JT of the exhaust gas 14 discharged into the atmosphere to the marine main engine. Therefore, the amount (bulk, weight) and cost of the exhaust gas purification device 13 can be reduced by that amount.

  The exhaust scrubber 21 is mainly for removing sulfur oxides in the exhaust gas 14, and the circulation scrubber 26 is for removing sulfur oxides and particulate matter in the exhaust gas 14. Is. If comprised in this way, the purification processing capacity of the exhaust scrubber 21 can be appropriately set according to, for example, the content of sulfur oxide in the exhaust gas 14 that is allowed to be discharged into the atmosphere. And the purification processing capacity of the circulation scrubber 26 can be appropriately set according to, for example, the content of particulate matter in the exhaust gas 14 that is allowed to supply air to the marine main engine 12. Thereby, the amount (bulk and weight) of the exhaust gas purification device 13 as a whole can be reduced.

  As shown in FIG. 1, the exhaust scrubber 21 is provided on the downstream side of the flow of the exhaust gas 14 with respect to the branch portion 25 where the circulation line 24 branches from the exhaust line 18.

  In this way, the exhaust scrubber 21 has the remaining flow rate of the exhaust gas 14 obtained by subtracting the EGR gas flow rate (circulation exhaust gas flow rate) that is divided into the circulation line 24 from the exhaust gas 14 discharged from the marine main engine 12. The exhaust scrubber 21 can be miniaturized as long as it has a purification capacity capable of purifying the exhaust gas.

  Next, a second embodiment of the marine engine system according to the present invention will be described with reference to FIG. The ship engine system 46 according to the second embodiment shown in FIG. 2 is different from the ship engine system 11 according to the first embodiment shown in FIG. 1 in the first embodiment shown in FIG. Is provided on the downstream side of the flow of the exhaust gas 14 with respect to the branch portion 25 where the circulation line 24 branches from the exhaust line 18, whereas in the second embodiment shown in FIG. It is provided at the upstream side of the flow of the exhaust gas 14 from the branch portion 25 where the circulation line 24 branches from the line 18.

  Except for this, the configuration is the same as that of the first embodiment and acts in the same way, so the equivalent parts are denoted by the same reference numerals and their detailed description is omitted.

  Thus, when the exhaust scrubber 21 purifies the entire amount of the exhaust gas 14 discharged from the marine main engine 12, the exhaust gas 14 circulated to the marine main engine 12 is converted into the exhaust scrubber 21 and the circulation scrubber 21. Both scrubbers 26 can be used for purification. As a result, the circulation scrubber 26 can be reduced in size, and the amount (bulk and weight) of the exhaust gas purification device 13 as a whole can be reduced.

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

  In the first embodiment shown in FIG. 1, an exhaust scrubber 21 and a circulation scrubber 26 are provided separately. The exhaust scrubber 21 is provided with a first circulating fluid line 34, and the circulation scrubber 26 includes The second circulating fluid line 37 is provided.

  In contrast, in the third embodiment shown in FIG. 3, the exhaust scrubber 21 and the circulation scrubber 26 are formed as an integrated scrubber 49, and the integrated scrubber 49 and the circulating fluid tank 30 are mutually shared circulating fluid. The circulating fluid 28 is circulated by the common drainage pipe 51 and the common supply liquid pipe 52 connected by the line 50 and constituting the common circulating fluid line 50 in the same manner as the circulating fluid lines 34 and 37 of the first embodiment. It has become. Further, the exhaust gas 14 is branched at the branch portion 25 between the exhaust line 18 and the circulation line 24 inside the integrated scrubber 49 and is purified to the purification levels JT and JK required for the respective lines. .

  Except for this, the configuration is the same as that of the first embodiment and acts in the same way, so the equivalent parts are denoted by the same reference numerals and their detailed description is omitted.

  As described above, the integrated scrubber 49 including the exhaust scrubber 21 and the circulation scrubber 26 uses the common circulating fluid line 50, whereby the circulating fluid line can be simplified and the circulating fluid line can be simplified. The amount of the circulating fluid 28 can be reduced as a whole, and the amount and cost of the exhaust gas purification device 48 as a whole can be further reduced.

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

  In the first embodiment shown in FIG. 1, a branch portion 25 is provided between the turbine portion 20 of the exhaust line 18 and the exhaust scrubber 21, and the exhaust gas 14 passing through the branch portion 25 is purified by the circulation scrubber 26. The purified exhaust gas 14 is compressed by the compressor unit 22 together with fresh air, and the compressed mixed gas is supplied to each cylinder 15.

  On the other hand, in the fourth embodiment shown in FIG. 4, the branch portion 25 is provided between the exhaust manifold 17 of the exhaust line 18 and the turbine portion 20, and the exhaust gas 14 passing through the branch portion 25 is used for circulation. The exhaust gas 14 purified by the scrubber 26 is compressed by a compressor 55 provided separately, and the compressed EGR gas 14 is supplied to each cylinder 15. The fresh air is compressed by the compressor unit 22, and the compressed fresh air is combined with the purified EGR gas 14 that has been purified and the supply manifold 16 to be supplied to each cylinder 15. It has become.

  Except for this, the configuration is the same as that of the first embodiment and acts in the same way, so the equivalent parts are denoted by the same reference numerals and their detailed description is omitted.

  According to the fourth embodiment configured as described above, the compressor unit 22 for compressing fresh air and the compressor 55 for compressing the EGR gas 14 are separately provided. There is no need to allow the EGR gas 14 to pass through the compressor unit 22, and it is possible to prevent the compressor unit 22 from being contaminated due to the influence of the EGR gas 14 and degrading performance.

  Next, a fifth embodiment of a marine engine system according to the present invention will be described with reference to FIG. The difference between the marine engine system 57 of the fifth embodiment shown in FIG. 5 and the marine engine system 54 of the fourth embodiment shown in FIG. 4 is that the circulating fluid purifier 29 is different.

  In the circulating fluid purification device 29 of the fourth embodiment shown in FIG. 4, the circulating fluid tank 30, the centrifuge 31, the waste tank 32, and the chemical tank 33 are both the exhaust scrubber 21 and the circulating scrubber 26. It is configured to be shared by all.

  On the other hand, the circulating fluid purification devices 29 and 29 of the fifth embodiment shown in FIG. 5 are configured to remove all of the circulating fluid tank 30, the centrifuge 31, the waste tank 32, and the chemical tank 33 from the exhaust scrubber 21. In addition, each of the circulation scrubbers 26 is provided exclusively.

  Except for this, the configuration is the same as that of the first embodiment and acts in the same way, so the equivalent parts are denoted by the same reference numerals and their detailed description is omitted.

  Also according to the fifth embodiment configured as described above, as described in the above embodiments, the required purification level, the type and amount (volume, weight) of air pollutants to be purified, and Depending on the amount (volume, weight) of the exhaust gas 14 to be purified, it is possible to set the respective purification processing functions and capabilities of the exhaust scrubber 21 and the circulation scrubber 26. Thereby, the amount (bulk and weight) of the scrubbers 21 and 26 of the exhaust gas purification device 58 can be reduced, and the cost of the scrubbers 21 and 26 can be reduced.

  However, in the above-described embodiment, for example, as shown in FIG. 1, the circulating liquid tank 30, the centrifuge 31, the waste tank 32, and the chemical tank 33 are all in both the exhaust scrubber 21 and the circulation scrubber 26. Although configured to be shared, instead of this, any of these may be shared by both scrubbers 21 and 26.

  As described above, the exhaust gas purifying apparatus and the ship engine system including the exhaust gas purifying apparatus according to the present invention can reduce the amount (bulk and weight) of the exhaust gas purifying apparatus as a whole, thereby reducing the cost. It has an excellent effect and is suitable for application to such an exhaust gas purification device and a ship engine system equipped with the exhaust gas purification device.

DESCRIPTION OF SYMBOLS 11 Ship engine system 12 Marine main engine 13 Exhaust gas purification apparatus 14 Exhaust gas, EGR gas 15 Cylinder 16 Supply manifold 17 Exhaust manifold 18 Exhaust line 19 Exhaust turbine supercharger 20 Turbine part 21 Exhaust scrubber 22 Compressor part 23 Rotation Axis 24 Circulation line 25 Branch portion 26 Circulation scrubber 27 Fresh air introduction line 28 Circulating fluid 29 Circulating fluid purification device 30 Circulating fluid tank 31 Centrifugal separator 32 Waste tank 33 Drug tank 34 First circulating fluid line 35 First drainage liquid Pipe 36 First supply pipe 37 Second circulation liquid line 38 Second drainage pipe 39 Second supply pipe 40 Third circulation liquid line 41 Third drainage pipe 42 Third supply pipe 43 Waste discharge pipe 44 Drug Supply pipe 46, 48 Marine engine system 49 Integrated scrubber 50 Shared circulating fluid line 51 Shared drainage pipe 52 Shared supply Tube 54 marine engine system 55 compressor 57 marine engine system 58 exhaust gas purification apparatus

Claims (8)

In an exhaust gas purification device that reduces and removes air pollutants in exhaust gas discharged from a marine main engine,
An exhaust line for connecting to the marine main engine and exhausting exhaust gas discharged from the marine main engine into the atmosphere;
A circulation line provided so as to branch from the exhaust line, and for recharging a part of the exhaust gas in the exhaust line to the marine main engine;
An exhaust scrubber provided in the exhaust line for purifying exhaust gas discharged into the atmosphere;
An exhaust gas purification apparatus comprising: a circulation scrubber provided in the circulation line for purifying exhaust gas re-supplied to the marine main engine.   The exhaust gas purification device according to claim 1, wherein the circulation scrubber has a higher level of purifying exhaust gas than the exhaust scrubber. The exhaust scrubber is for removing sulfur oxide in the exhaust gas,
The exhaust gas purification device according to claim 1 or 2, wherein the scrubber for circulation is for removing sulfur oxides and particulate matter in the exhaust gas. The exhaust scrubber and the circulation scrubber use a circulating liquid to purify the exhaust gas, and the circulating liquid is purified by a circulating liquid tank and a centrifuge, and the waste separated by the centrifuge Is stored in a waste tank, and the drug supplied from the drug tank is used to adjust the pH of the circulating fluid.
Any or all of the circulating liquid tank, the centrifuge, the waste tank, and the chemical tank are shared by both the exhaust scrubber and the circulation scrubber. Item 4. The exhaust gas purifying device according to any one of Items 1 to 3.   The exhaust gas according to any one of claims 1 to 4, wherein the exhaust scrubber is provided on a downstream side of a flow of the exhaust gas from a branch portion where the circulation line branches from the exhaust line. Purification equipment.   The exhaust gas according to any one of claims 1 to 4, wherein the exhaust scrubber is provided upstream of a flow of the exhaust gas from a branch portion where the circulation line branches from the exhaust line. Purification equipment.   The exhaust scrubber and the circulation scrubber are formed as an integrated scrubber, and a branching portion for branching the circulation line from the exhaust line is provided in the integrated scrubber, and the integrated scrubber and the circulating fluid tank are The exhaust gas purification device according to any one of claims 4 to 6, wherein the exhaust gas purification devices are connected to each other through a common circulating fluid line.   A ship engine system comprising the exhaust gas purifying device according to any one of claims 1 to 7.

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