JP6349240B2 - Exhaust gas treatment equipment - Google Patents

Description

  The present invention relates to an exhaust gas treatment apparatus that is mounted on a ship or the like and removes sulfur oxides contained in exhaust gas.

  Exhaust gas discharged from an engine mounted on a ship contains harmful substances such as sulfur oxide (SOx), nitrogen oxide (NOx), and dust. Since these harmful substances cause air pollution, regulations are being strengthened. In order to reduce the sulfur oxide in the exhaust gas, it is conceivable to reduce the sulfur content in the fuel or to provide an exhaust gas treatment device. However, the fuel containing a small amount of sulfur is expensive and increases the fuel cost. As a conventional exhaust gas treatment apparatus, for example, there is one described in Patent Document 1 below.

  Exhaust gas treatment equipment includes wet desulfurization equipment and dry desulfurization equipment. Wet desulfurization equipment requires wastewater treatment containing sulfur oxides, and the exhaust gas temperature decreases, so the equipment goes downstream. Application of the denitration apparatus becomes difficult. Examples of the dry-type desulfurization apparatus include a circulation flow type desulfurization apparatus, which is described in Patent Document 2 below, for example.

International Publication No. 2012/026302 JP 2008-275290 A

  The above-described conventional circulation flow type desulfurization apparatus introduces exhaust gas into the apparatus main body from below the dispersion plate, and fluidizes solid particles having desulfurization performance disposed on the dispersion plate by the exhaust gas, thereby solidifying the solid body. The sulfur oxide in the exhaust gas is removed by promoting the reaction between the particles and the sulfur oxide in the exhaust gas. In this case, by introducing exhaust gas from the lower part of the apparatus main body, the solid particles on the dispersion plate are caused to flow by the exhaust gas. Therefore, since exhaust gas is deprived of pressure when flowing solid particles, there is a problem that pressure loss occurs here, and then it cannot be properly discharged from the chimney.

  This invention solves the subject mentioned above, and it aims at providing the required pressure in the path | route which processes waste gas, and providing the waste gas processing apparatus which can process this waste gas appropriately.

  In order to achieve the above object, an exhaust gas treatment apparatus of the present invention includes an exhaust gas path through which exhaust gas flows, a dry desulfurization apparatus provided in the exhaust gas path, and a downstream of the dry desulfurization apparatus in the exhaust gas path in the flow direction of the exhaust gas. And a booster that boosts the exhaust gas so that the pressure of the exhaust gas immediately before the outlet of the chimney is equal to or higher than a preset specified pressure.

  Therefore, the exhaust gas flowing through the exhaust gas path is released from the chimney to the atmosphere after sulfur oxides contained in the dry desulfurization apparatus are reduced or removed. At this time, the exhaust gas can be appropriately discharged from the chimney to the atmosphere by the pressure immediately before the chimney outlet being increased to a specified pressure or higher by the booster. That is, the exhaust gas can be properly purified by securing a necessary pressure in the path for treating the exhaust gas.

  In the exhaust gas treatment apparatus of the present invention, the booster is a blower provided upstream of the dry desulfurization device in the exhaust gas path in the flow direction of the exhaust gas.

  Accordingly, the exhaust gas flowing in the exhaust gas path is pressurized by a blower, for example, a booster blower, and then introduced into a dry desulfurization apparatus, and the sulfur oxides contained therein are reduced or removed, and then appropriately discharged from the chimney to the atmosphere. . In this case, increasing the pressure of the exhaust gas in advance and introducing it into the dry desulfurization device increases the pressure of the exhaust gas flowing through the exhaust gas path downstream from the dry desulfurization device. Can be improved.

  The exhaust gas treatment apparatus of the present invention is characterized in that a denitration device is provided between the dry desulfurization device and the chimney in the exhaust gas path.

  Therefore, by depressurizing the exhaust gas in advance and introducing it into the dry desulfurization device, the pressure of the exhaust gas flowing through the exhaust gas path downstream from the dry desulfurization device increases, so that a denitration device can be provided here. Nitrogen oxides contained can be reduced or removed by the apparatus.

  In the exhaust gas treatment apparatus of the present invention, the pressure increasing device is a blower provided between the dry desulfurization device and the chimney in the exhaust gas path.

  Therefore, after the sulfur oxide contained in the dry desulfurization apparatus is reduced or removed, the exhaust gas flowing through the exhaust gas path is pressurized by a blower, for example, an inducing fan, and then appropriately discharged from the chimney to the atmosphere. In this case, by increasing the pressure of the low-pressure exhaust gas from the dry desulfurization apparatus, the blower can be reduced in size, and the structure can be simplified and the cost can be reduced.

  In the exhaust gas treatment apparatus of the present invention, a heat exchanger that generates steam by exchanging heat with the exhaust gas is provided in the exhaust gas path, and the blower is driven by the steam generated by the heat exchanger. .

  Therefore, the heat exchanger generates water by heating water with the exhaust gas discharged from the dry desulfurization device, and sends the steam to the blower to drive the blower, so that no electric power is required to drive the blower. Thus, since the operation efficiency is higher than that of the electric motor driven blower, useless energy consumption can be suppressed, and the structure can be simplified and the cost can be reduced.

  In the exhaust gas treatment apparatus of the present invention, the dry desulfurization apparatus is a desulfurization apparatus that removes sulfur oxides in the exhaust gas by flowing a large number of particles having desulfurization performance by the exhaust gas introduced therein. It is said.

  Therefore, by using a dry desulfurization apparatus as a desulfurization apparatus, compared with a wet desulfurization apparatus, wastewater treatment containing sulfur oxides becomes unnecessary, and a decrease in exhaust gas temperature can be suppressed.

  In the exhaust gas treatment apparatus of the present invention, the exhaust gas path is connected to an exhaust manifold of a marine engine upstream of the dry desulfurization apparatus in the flow direction of the exhaust gas, and is supercharged between the exhaust manifold and the dry desulfurization apparatus. The depressurization path for introducing the exhaust gas of the exhaust manifold to the dry desulfurization apparatus by bypassing the turbine and the opening / closing valve for opening and closing the detour path are provided as the booster. It is said.

  Therefore, when the on-off valve is opened, the exhaust manifold exhaust gas bypasses the turbine through the bypass path and is introduced into the dry desulfurization device, the pressure of the exhaust gas introduced into the dry desulfurization device increases, and the exhaust gas is appropriately discharged from the chimney. Can be released.

  In the exhaust gas treatment apparatus of the present invention, the exhaust gas path is connected to an exhaust manifold of a marine engine on the upstream side in the flow direction of the exhaust gas from the dry desulfurization device, and a plurality of exhaust gas paths are provided between the exhaust manifold and the dry desulfurization device. Each of the turbines of the supercharger is provided in parallel, and as the booster, a plurality of bypass paths for introducing the exhaust manifold exhaust gas to each of the turbines and bypassing each turbine, and the plurality of bypass paths, respectively A plurality of on-off valves for opening and closing are provided.

  Therefore, when one of the on-off valves is opened, the exhaust gas from the exhaust manifold is bypassed by the bypass route and is introduced into the dry desulfurization device, and the pressure of the exhaust gas introduced into the dry desulfurization device increases. The exhaust gas can be properly discharged from the chimney.

  According to the exhaust gas treatment apparatus of the present invention, it is possible to ensure a necessary pressure in a path for treating exhaust gas and appropriately purify the exhaust gas.

FIG. 1 is a schematic configuration diagram illustrating an exhaust gas treatment apparatus according to the first embodiment. FIG. 2 is a schematic view showing a fluid desulfurization apparatus. FIG. 3 is a schematic diagram showing a modification of the fluid desulfurization apparatus. FIG. 4 is a graph showing the pressure of the exhaust gas in the exhaust gas treatment path. FIG. 5 is a schematic configuration diagram illustrating an exhaust gas treatment apparatus of the second embodiment. FIG. 6 is a schematic configuration diagram illustrating an exhaust gas treatment apparatus of the third embodiment. FIG. 7 is a graph showing the pressure of the exhaust gas in the exhaust gas treatment path. FIG. 8 is a schematic configuration diagram illustrating an exhaust gas treatment apparatus of the fourth embodiment. FIG. 9 is a schematic configuration diagram illustrating an exhaust gas treatment apparatus of a fifth embodiment.

  Exemplary embodiments of an exhaust gas treatment apparatus according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this embodiment, and when there are two or more embodiments, what comprises combining each embodiment is also included.

[First Embodiment]
FIG. 1 is a schematic configuration diagram illustrating an exhaust gas treatment apparatus according to the first embodiment, FIG. 2 is a schematic diagram illustrating a fluid desulfurization apparatus, and FIG. 3 is a schematic diagram illustrating a modification of the fluid desulfurization apparatus.

  In the first embodiment, as shown in FIG. 1, the exhaust gas treatment device 10 treats exhaust gas discharged from a diesel engine 11 that is mounted on a ship and used as a harmful substance in the exhaust gas. Oxides (SOx), nitrogen oxides (NOx), unburned components, dust, etc. are reduced or removed. In this case, the diesel engine 11 is used as a main engine or a power generation device of a ship.

  The diesel engine 11 is configured such that an intake manifold 13 is disposed on one side of a cylinder portion 12 and an exhaust manifold 14 is disposed on the other side. The cylinder portion 12 includes a plurality (six in this embodiment) of cylinders 21 arranged in series. Although not shown, each cylinder 21 is provided with a piston in a reciprocating manner in the vertical direction to form a combustion chamber. Each piston has a lower portion connected to the crankshaft.

  The intake manifold 13 is connected to each cylinder 21 of the cylinder portion 12 via an intake port 22. The exhaust manifold 14 is connected to each cylinder 21 of the cylinder portion 12 via an exhaust port 23, and an exhaust valve (not shown) is provided in each exhaust port 23. The intake manifold 13 is connected to the intake path L1, and the exhaust manifold 14 is connected to the exhaust path L2. The cylinder portion 12 is provided with an injector 24 for injecting fuel (for example, heavy oil) inside each cylinder 21, and each injector 24 is connected to a fuel tank (not shown).

  Therefore, the cylinder portion 12 is supplied with the fuel supplied from the injectors 24 to the combustion chamber and the combustion gas (for example, air) supplied from the intake manifold 13 via the intake ports 22, mixed and compressed. To burn. And each piston moves up and down by the energy generated by this combustion, and the crankshaft to which the lower end of each piston is connected is rotated. On the other hand, the exhaust gas generated by the combustion is discharged to the exhaust manifold 14 through the exhaust port 23.

  The diesel engine 11 is provided with an exhaust turbine supercharger 31. The exhaust turbine supercharger 31 is configured such that a compressor 32 and a turbine 33 are coaxially connected via a rotation shaft 34, and the compressor 32 and the turbine 33 can rotate integrally with the rotation shaft 34. The compressor 32 is connected to an intake path L3 for intake from the outside and an intake path L1 to the intake manifold 13. The turbine 33 is connected to an exhaust path L2 leading to the exhaust manifold 14, and is connected to an exhaust path L4 for exhausting to the outside. The intake passage L1 is provided with an air cooler 35 that cools the air compressed by the compressor 32.

  Therefore, the turbine 33 is driven by the exhaust gas (combustion gas) guided from the exhaust manifold 14 through the exhaust path L2, and after driving the compressor 32, the exhaust gas is discharged to the outside from the exhaust path L4. On the other hand, the compressor 32 is driven by the turbine 33, compresses the air taken in from the intake passage L3, and then pumps the compressed air from the intake passage L1 to the intake manifold 13.

  The exhaust path L4 discharges exhaust gas discharged from the exhaust manifold 14 and driving the turbine 33 to the outside, and functions as an exhaust gas path of the present invention in which the exhaust gas flows. The exhaust gas treatment device 10 has a booster blower (pressure booster, blower) 41, a fluid desulfurization device (dry desulfurization device) 42, and a first heat exchanger in the exhaust path L4 toward the downstream side in the flow direction of the exhaust gas. 43, a bag filter 44, a denitration device 45, a second heat exchanger 46, and a chimney 47 are provided in this order.

  The booster blower 41 is driven by a drive motor (electric motor) 48 to increase the pressure of the exhaust gas flowing through the exhaust path L4. As will be described in detail later, the fluid-type desulfurization device 42 reduces or removes sulfur oxides in the exhaust gas by flowing a large number of particles having desulfurization performance by the exhaust gas introduced therein. The 1st heat exchanger 43 and the 2nd heat exchanger 46 produce | generate a vapor | steam by heat-exchanging water with waste gas. The bag filter 44 is for reducing or removing unburned components and dust in the exhaust gas. The denitration device 45 reduces or removes nitrogen oxides in the exhaust gas. The chimney 47 raises the purified exhaust gas and discharges it from the upper end to the atmosphere.

  Here, the fluid desulfurization apparatus 42 will be described in detail. As shown in FIG. 2, the container 51 has a hollow box shape, and is provided with an inlet 52 for introducing particles (fluid material) A having desulfurization performance at the end. Further, the container 51 is provided with a porous dispersion plate 54 that supports a large number of particles A and forms a chamber 53 at a lower portion, and an exhaust gas inlet 55 is provided at the lower end portion so as to communicate with the chamber 53. Yes. The container 51 communicates with the upper part of the separation device 57 via the upper passage 56. The separation device 57 is a cyclone, and an exhaust gas outlet 58 is formed at an upper end portion, and a discharge port 59 for discharging particles (fluid material) A is provided at a lower side portion. Further, the lower part of the container 51 and the lower part of the separation device 57 are connected via a seal pod 60.

  Therefore, the container 51 is supplied with particles from the inlet 52 and is supplied with exhaust gas from the exhaust gas inlet 55 through the dispersion plate 54, thereby forming a fluidized bed having a predetermined thickness above the dispersion plate 54. . Here, when the exhaust gas contacts a large number of particles, sulfur oxides in the exhaust gas are reduced or removed. The particles having adsorbed the sulfur oxide flow in the container 51, move to the lower part of the separation device 57 via the seal pod 60, and are discharged from the discharge port 59. On the other hand, the exhaust gas from which sulfur oxide has been reduced or removed rises in the container 51 and is discharged from the exhaust gas outlet 58 after the fine particles are removed by the separation device 57.

  The fluid desulfurization apparatus is not limited to the fluid desulfurization apparatus 42 described above. As shown in FIG. 3, in the fluid desulfurization apparatus 42 </ b> A, the container 61 has a hollow box shape, and is provided with an input port 62 for introducing particles (fluid material) A having desulfurization performance at the upper end portion. Is provided with a discharge port 63 for discharging particles (fluid material) A. Further, the container 61 is provided with a porous dispersion plate 65 that forms a chamber 64 on one side, and a porous plate 67 that forms a chamber 66 on the other side. The container 61 is provided with an exhaust gas inlet 68 on one side thereof in communication with the chamber 64, and on the other side with an exhaust gas outlet 69 in communication with the chamber 66. A circulation path 70 is provided for returning particles discharged from the discharge port 63 to the input port 62.

  Therefore, the container 61 is supplied with particles from the inlet 62 and discharged from the outlet 63, and exhaust gas is supplied from the exhaust gas inlet 68 through the dispersion plate 65 and discharged from the exhaust gas outlet 69 through the porous plate 67. As a result, a fluidized bed is formed. Here, when the exhaust gas contacts a large number of particles, sulfur oxides in the exhaust gas are reduced or removed. The particles having adsorbed sulfur oxides are circulated by the circulation path 70 or discarded as used. On the other hand, the exhaust gas from which sulfur oxide has been reduced or removed traverses the container 61 and is discharged from the exhaust gas outlet 69.

  Further, as shown in FIG. 1, the exhaust gas treatment device 10 is provided with an exhaust gas recirculation path L <b> 5 that returns the exhaust gas to the intake manifold 13. The exhaust gas recirculation path L5 has a base end connected between the second heat exchanger 46 and the chimney 47 in the exhaust path L4, and a distal end connected to the air supply path L3. The exhaust gas recirculation path L5 is provided with a flow rate adjustment valve 49 for adjusting the amount of exhaust gas (exhaust gas recirculation gas) introduced. Therefore, the compressor 32 compresses the mixed gas of the air sucked from the intake path L3 and the exhaust gas recirculation gas introduced from the exhaust gas recirculation path L5.

  By the way, the fluid-type desulfurization device 42 (42A) removes sulfur oxides in the exhaust gas by particles by flowing particles having desulfurization performance by the exhaust gas introduced therein. For this reason, the exhaust gas introduced into the fluid desulfurization device 42 causes a pressure loss by causing particles to flow. Therefore, in the present embodiment, a booster blower 41 is provided on the upstream side of the fluid desulfurization device 42 so that the pressure of the exhaust gas immediately before the outlet of the chimney 47 becomes equal to or higher than a preset specified pressure. Pressurize the exhaust gas.

That is, the chimney 47 moves the exhaust gas introduced from the lower part upward and releases it to the atmosphere from the upper part, and it is necessary to maintain the pressure of the exhaust gas at least above atmospheric pressure immediately before the outlet, that is, at the upper end. . The pressure of the exhaust gas discharged from the turbine 33 of the exhaust turbine supercharger 31 passes through the fluid desulfurization device 42, the first heat exchanger 43, the bag filter 44, the denitration device 45, the second heat exchanger 46, and the chimney 47. Every time you lose, you lose. In the present embodiment, the pressure loss of the exhaust gas received by the fluid desulfurization device (dry desulfurization device) 42, the first heat exchanger 43, the bag filter 44, the denitration device 45, the second heat exchanger 46, and the chimney 47 is taken into consideration. Then, the pressure of the exhaust gas introduced into the fluid desulfurization device 42 is increased by the pressure booster 41, and the pressure of the exhaust gas at the inlet of the fluid desulfurization device 42 is increased to a predetermined pressure.

  Hereinafter, the operation of the exhaust gas treatment apparatus 10 of the first embodiment will be described.

  In the exhaust gas treatment apparatus 10 of the first embodiment, as shown in FIG. 1, in the diesel engine 11, combustion gas is supplied to each cylinder 21 from the intake manifold 13 via the intake port 22, and the injector Fuel is supplied from 24 and burns. The exhaust gas generated by the combustion is discharged to the exhaust manifold 14 via the exhaust port 23 and is discharged to the exhaust path L2. The exhaust turbine supercharger 31 is discharged to the exhaust path L4 after driving the turbine 33 and the compressor 32 with the exhaust gas guided from the exhaust path L2. The compressor 32 compresses the air taken in from the intake passage L3 and pumps it as compressed combustion gas from the intake passage L1 to the intake manifold 13.

  The exhaust gas discharged to the exhaust path L4 is first pressurized by the booster blower 41 and introduced into the fluid desulfurization device 42, and sulfur oxides in the exhaust gas are reduced or removed. The exhaust gas discharged from the fluid desulfurization device 42 is heat recovered by the first heat exchanger 43, and then unburned components and soot in the exhaust gas are reduced or removed by the bag filter 44. Nitrogen oxides are reduced or eliminated. The exhaust gas discharged from the denitration device 45 is recovered by the second heat exchanger 46 and then discharged from the chimney 47 to the atmosphere.

  Here, the pressure change of the exhaust gas from being discharged from the exhaust turbine supercharger 31 until being released to the atmosphere by the chimney 47 will be described. FIG. 4 is a graph showing the pressure of the exhaust gas in the exhaust gas treatment path.

  As shown in FIG. 4, the exhaust gas that has driven the turbine 33 is first pressurized by the booster blower 41 at the path position R <b> 1 to increase the pressure. Next, the pressurized exhaust gas is introduced into the flow-type desulfurization device 42 at the path position R2, and pressure loss occurs during the processing, and the pressure is reduced. Subsequently, the exhaust gas passes through the first heat exchanger 43, the bag filter 44, the denitration device 45, the second heat exchanger 46, and the chimney 47 at the path positions R3, R4, R5, R6, and R7. Occurs and the pressure drops. The exhaust gas is maintained at a pressure higher than the atmospheric pressure by a predetermined differential pressure ΔP at the path position R8 immediately before the exit of the chimney 47, and is appropriately discharged.

  As described above, in the exhaust gas treatment apparatus of the first embodiment, the exhaust path L4 through which the exhaust gas flows, the fluid desulfurization apparatus 42 provided in the exhaust path L4, and the fluid desulfurization apparatus 42 in the exhaust path L4 A chimney 47 provided on the downstream side in the flow direction, and a booster blower 41 that boosts the exhaust gas so that the pressure of the exhaust gas immediately before the outlet of the chimney 47 becomes equal to or higher than a preset specified pressure are provided.

  Accordingly, the exhaust gas is discharged from the chimney 47 to the atmosphere after the sulfur oxide contained by the fluid desulfurization device 42 is reduced or removed. At this time, since the pressure immediately before the exit of the chimney 47 is increased to a specified pressure higher than the atmospheric pressure by the booster blower 41, the exhaust gas can be appropriately discharged from the chimney 47 to the atmosphere. That is, it is possible to ensure a necessary pressure in the exhaust path L4 for treating the exhaust gas and appropriately purify the exhaust gas.

  In the exhaust gas treatment device of the first embodiment, the booster blower 41 is provided upstream of the fluid desulfurization device 42 in the exhaust path L4 in the exhaust gas flow direction. Accordingly, the exhaust gas is boosted by the booster blower 41 and then introduced into the fluid desulfurization device 42. After the contained sulfur oxides are reduced or removed, the exhaust gas is appropriately discharged from the chimney 47 to the atmosphere. In this case, the pressure of the exhaust gas flowing through the exhaust passage L4 downstream from the fluid desulfurization device 42 is increased by increasing the pressure of the exhaust gas in advance and introducing the exhaust gas into the fluid desulfurization device 42. The degree of freedom in design can be improved. Moreover, since the pressure of the booster blower 41 boosts the exhaust gas, the temperature of the exhaust gas rises due to the adiabatic compression heat, so that the reaction in the fluid desulfurization device 42 may be enhanced.

  In the exhaust gas treatment device of the first embodiment, the bag filter 44 and the denitration device 45 are provided between the fluid desulfurization device 42 and the chimney 47 in the exhaust path L4. By increasing the pressure of the exhaust gas by the booster blower 41, the pressure of the exhaust gas flowing through the exhaust path L4 on the downstream side of the fluid desulfurization device 42 increases. Therefore, the bag filter 44 and the denitration device 45 can be disposed in the exhaust path L4, the unburned components and dust in the exhaust gas are removed by the bag filter 44, and the nitrogen oxides in the exhaust gas are removed by the denitration device 45. Thus, the purification ability can be improved.

  In the exhaust gas treatment apparatus of the first embodiment, heat exchangers 43 and 46 are provided between the fluid desulfurization device 42 and the chimney 47 in the exhaust path L4. The pressure and temperature of the exhaust gas flowing through the exhaust passage L4 on the downstream side of the fluid desulfurization device 42 are increased by increasing and increasing the temperature of the exhaust gas by the booster blower 41. Therefore, by arranging the heat exchangers 43 and 46 in the exhaust path L4, the heat of the exhaust gas can be efficiently recovered, and the drive loss of the booster blower 41 can be suppressed by effectively using the exhaust gas heat.

  In the exhaust gas treatment apparatus of the first embodiment, the booster blower 41 is driven by the drive motor 48. Accordingly, the booster blower 41 is driven by the drive motor 48, and the booster blower 41 can be driven from the start of the exhaust gas treatment device 10 to appropriately boost the exhaust gas, thereby purifying the exhaust gas.

  In the exhaust gas treatment apparatus of the first embodiment, a fluid desulfurization apparatus 42 that removes sulfur oxides in the exhaust gas by applying a large number of particles having desulfurization performance with the exhaust gas introduced inside is applied. Therefore, as compared with a wet desulfurization apparatus, wastewater treatment containing sulfur oxide is not necessary, and a decrease in exhaust gas temperature can be suppressed.

[Second Embodiment]
FIG. 5 is a schematic configuration diagram illustrating an exhaust gas treatment apparatus of the second embodiment. In addition, the same code | symbol is attached | subjected to the member which has the same function as embodiment mentioned above, and detailed description is abbreviate | omitted.

  In the second embodiment, as shown in FIG. 5, the exhaust gas treatment device 100 is disposed in the exhaust path L4 toward the downstream side in the flow direction of the exhaust gas, the booster blower 41, the fluid desulfurization device 42, and the first heat exchange. The apparatus 43, the bag filter 44, the denitration apparatus 45, the 2nd heat exchanger 46, and the chimney 47 are provided in order.

  The booster blower 41 is driven by the drive motor 48 and is driven by the steam turbine 101 to boost the pressure of the exhaust gas flowing through the exhaust path L4. The first heat exchanger 43 exchanges heat between the exhaust gas flowing through the exhaust path L4 and the water flowing through the heat exchange path 102. By heating the water in the heat exchange path 102 with the exhaust gas of the exhaust path L4, Generate steam. The heat exchange path 102 has a base end connected to the pump 103 and a tip connected to the steam turbine 101.

  Therefore, the booster blower 41 is driven by the drive motor 48 when the exhaust gas treatment device 100 is started. When the temperature of the exhaust gas in the exhaust path L4 becomes high and the first heat exchanger 43 can generate steam by the heat of the exhaust gas, the generated steam is sent from the heat exchange path 102 to the steam turbine 101. The exhaust gas treatment device 100 is driven by the steam turbine 101 during normal operation.

  The exhaust gas treatment apparatus 100 of the second embodiment has substantially the same configuration and operation as the exhaust gas treatment apparatus 10 of the first embodiment except for the drive configuration of the booster blower 41. Description of is omitted.

  As described above, in the exhaust gas treatment apparatus of the second embodiment, the booster blower 41, the fluid desulfurization device 42, the first heat exchanger 43, and the chimney 47 are provided in the exhaust path L4. The pressure of the exhaust gas is increased so that the pressure of the exhaust gas immediately before the outlet becomes equal to or higher than the specified pressure, and the booster blower 41 is driven by the steam generated by the first heat exchanger 43.

  Therefore, the first heat exchanger 43 heats the water flowing through the heat exchange path 102 by the exhaust gas flowing through the exhaust path L4 to generate steam, and sends the steam to the steam turbine 101 to drive the steam turbine 101. The exhaust gas is boosted by driving the booster blower 41. Therefore, no electric power is required to drive the booster blower 41, and the operating efficiency is higher than that of an electric motor-driven blower. Therefore, useless energy consumption can be suppressed, and the structure can be simplified and reduced. Cost reduction can be made possible.

  In the second embodiment, the steam generated in the first heat exchanger 43 is supplied to the steam turbine 101 and driven, and the booster blower 41 is driven by the steam turbine 101. However, the second heat exchange is performed. The steam generated by the vessel 46 may be sent to the steam turbine 101 and driven, and the booster blower 41 may be driven by the steam turbine 101.

[Third Embodiment]
FIG. 6 is a schematic configuration diagram illustrating the exhaust gas treatment apparatus of the third embodiment, and FIG. 7 is a graph illustrating the pressure of the exhaust gas in the exhaust gas treatment path. In addition, the same code | symbol is attached | subjected to the member which has the same function as embodiment mentioned above, and detailed description is abbreviate | omitted.

  In the third embodiment, as shown in FIG. 6, the exhaust gas treatment device 110 is provided with a fluid desulfurization device 42, a first heat exchanger 43, a bug in the exhaust path L <b> 4 toward the downstream side in the flow direction of the exhaust gas. A filter 44, a second heat exchanger 46, an incentive fan (a booster, a blower) 111, and a chimney 47 are provided in this order.

  As with the booster blower 41 (see FIG. 1) of the first embodiment, the incentive fan 111 is driven by a drive motor (electric motor) to increase the pressure of the exhaust gas flowing through the exhaust path L4. Further, the incentive fan 111 may be driven by a drive motor (electric motor) and a steam turbine to boost the pressure of exhaust gas flowing through the exhaust path L4, similarly to the booster blower 41 (see FIG. 5) of the second embodiment. Good.

  Therefore, the exhaust gas discharged to the exhaust path L4 is first introduced into the fluid desulfurization device 42, and sulfur oxides in the exhaust gas are reduced or removed. The exhaust gas discharged from the fluid desulfurization device 42 is heat recovered by the first heat exchanger 43, and then unburned components and soot in the exhaust gas are reduced or removed by the bag filter 44, so that the second heat exchanger 46 The heat is recovered. The exhaust gas heat-recovered by the second heat exchanger 46 is pressurized by the induction fan 111 and then released from the chimney 47 to the atmosphere.

  As shown in FIG. 7, the exhaust gas that has driven the turbine 33 is first introduced into the flow-type desulfurization device 42 at the path position R <b> 11, and pressure loss occurs during the processing, thereby reducing the pressure. Subsequently, the exhaust gas passes through the first heat exchanger 43, the bag filter 44, and the second heat exchanger 46 at the path positions R12, R13, and R14, so that pressure loss occurs and the pressure decreases. The exhaust gas is boosted by the incentive fan 111 at the path position R15 and increases in pressure, and then passes through the chimney 47 at the path position R16 so that pressure loss occurs and the pressure decreases. Then, at a path position R17 immediately before the exit of the chimney 47, the pressure is maintained higher than the atmospheric pressure by a predetermined differential pressure ΔP and is appropriately discharged.

  As described above, in the exhaust gas treatment apparatus of the third embodiment, the exhaust path L4 through which the exhaust gas flows, the fluid desulfurization apparatus 42 provided in the exhaust path L4, and the fluid desulfurization apparatus 42 in the exhaust path L4 A chimney 47 provided on the downstream side in the flow direction, and an incentive fan 111 for boosting the exhaust gas so that the pressure of the exhaust gas immediately before the chimney 47 exits between the fluid desulfurization device 42 and the chimney 47 becomes equal to or higher than a specified pressure. Provided.

  Therefore, since the pressure immediately before the exit of the chimney 47 is increased by the incentive fan 111 to a specified pressure that is higher than the atmospheric pressure by a predetermined value, the exhaust gas can be appropriately discharged from the chimney 47 to the atmosphere. That is, it is possible to ensure a necessary pressure in the exhaust path L4 for treating the exhaust gas and appropriately purify the exhaust gas. Further, by increasing the pressure of the low-pressure exhaust gas immediately before entering the chimney 47, the incentive fan 111 can be reduced in size, and the structure can be simplified and the cost can be reduced.

[Fourth Embodiment]
FIG. 8 is a schematic configuration diagram illustrating an exhaust gas treatment apparatus of the fourth embodiment. In addition, the same code | symbol is attached | subjected to the member which has the same function as embodiment mentioned above, and detailed description is abbreviate | omitted.

  In the fourth embodiment, as shown in FIG. 8, the exhaust turbine supercharger 31 is configured such that a compressor 32 and a turbine 33 are coaxially connected via a rotating shaft 34. The compressor 32 is connected to an intake path L3 for intake from the outside and an intake path L1 to the intake manifold 13. The turbine 33 is connected to an exhaust path L2 leading to the exhaust manifold 14, and is connected to an exhaust path L4 for exhausting to the outside. In addition, the exhaust turbine supercharger 31 is provided with a bypass path L6 that causes exhaust gas from the exhaust manifold 14 to bypass the turbine 33 and flow to the exhaust path L4, and an open / close valve 121 that opens and closes the path is provided in the bypass path L6. .

  Therefore, the turbine 33 is driven by the exhaust gas (combustion gas) guided from the exhaust manifold 14 through the exhaust path L2, and after driving the compressor 32, the exhaust gas is discharged to the exhaust path L4. At this time, if the on-off valve 121 is opened, the exhaust gas can flow directly from the detour path L6 to the exhaust path L4 without driving the turbine 33 by the exhaust gas of the exhaust manifold 14. On the other hand, the compressor 32 is driven by the turbine 33, compresses the air taken in from the intake passage L3, and then pumps the compressed air from the intake passage L1 to the intake manifold 13.

  The exhaust gas treatment device 120 is directed to the exhaust path L4 toward the downstream side in the flow direction of the exhaust gas, the fluid desulfurization device 42, the first heat exchanger 43, the bag filter 44, the denitration device 45, and the second heat exchanger 46. The chimney 47 is provided in order. Further, the exhaust gas treatment device 120 is provided with a bypass path L6 and an on-off valve 121 in the exhaust turbine supercharger 31 as a booster of the present invention.

  Therefore, when the on-off valve 121 is opened and the exhaust gas in the exhaust manifold 14 is allowed to flow directly from the bypass path L6 to the exhaust path L4, the exhaust gas discharged to the exhaust path L4 is at a higher pressure than when the turbine 33 is driven. That is, the exhaust gas can be boosted by discharging it to the exhaust path L4 without driving the turbine. The pressurized exhaust gas is introduced into the fluid desulfurization device 42, and sulfur oxides in the exhaust gas are reduced or removed. The exhaust gas discharged from the fluid desulfurization device 42 is heat recovered by the first heat exchanger 43, and then unburned components and soot in the exhaust gas are reduced or removed by the bag filter 44. Nitrogen oxides are reduced or eliminated. The exhaust gas discharged from the denitration device 45 is recovered by the second heat exchanger 46 and then discharged from the chimney 47 to the atmosphere. At this time, the exhaust gas is properly discharged by being maintained at a pressure higher than the atmospheric pressure by a predetermined differential pressure immediately before the exit of the chimney 47.

  As described above, in the exhaust gas treatment apparatus of the fourth embodiment, the exhaust gas from the exhaust manifold 14 is used as the booster for boosting the exhaust gas so that the pressure of the exhaust gas immediately before the outlet of the chimney 47 becomes a specified pressure. A bypass path L6 that bypasses and introduces into the fluid desulfurization apparatus 42, and an on-off valve 121 that opens and closes the bypass path L6 are provided.

  Accordingly, the exhaust gas is pressurized by being discharged from the bypass path L6 to the exhaust path L4 without driving the turbine, and can be appropriately discharged from the chimney 47 to the atmosphere. That is, it is possible to ensure a necessary pressure in the exhaust path L4 for treating the exhaust gas and appropriately purify the exhaust gas.

[Fifth Embodiment]
FIG. 9 is a schematic configuration diagram illustrating an exhaust gas treatment apparatus of a fifth embodiment. In addition, the same code | symbol is attached | subjected to the member which has the same function as embodiment mentioned above, and detailed description is abbreviate | omitted.

  In the fifth embodiment, as shown in FIG. 9, the diesel engine 11 is provided with a plurality (three in this embodiment) of exhaust turbine superchargers 131, 132, and 133. The exhaust turbine superchargers 131, 132, 133 are arranged in parallel, and one exhaust turbine supercharger 131, 132, 133 is arranged corresponding to the two cylinders 21.

  In the intake path L1, the three branched intake paths L11, L12, and L13 are connected to the compressors (not shown) of the exhaust turbine superchargers 131, 132, and 133, and the intake path L3 is divided into three branches. Each branched intake path L31, L32, L33 is connected to each compressor. The exhaust path L2 has three branched exhaust paths L21, L22, L23 connected to the turbines (not shown) of the exhaust turbine superchargers 131, 132, 133, and the exhaust path L4 has three branches. The branched exhaust paths L41, L42, and L43 are connected to the turbines.

  Further, the exhaust turbine superchargers 131, 132, and 133 are provided with detour paths L61, L62, and L63 that flow the exhaust gas of the exhaust manifold 14 to the exhaust path L4 by bypassing the turbine, and are routed to the detour paths L61, L62, and L63. Open / close valves 134, 135, and 136 are provided for opening and closing. The bypass routes L61, L62, and L63 bypass the turbine and directly connect the branch exhaust routes L21, L22, and L23 and the branch exhaust routes L41, L42, and L43.

  Therefore, the exhaust turbine superchargers 131, 132, and 133 are driven by exhaust gases that are guided by the turbines from the exhaust manifold 14 through the exhaust passage L2 (branched exhaust passages L21, L22, and L23), and after driving the compressor, Is discharged to the exhaust path L4 (branch exhaust paths L41, L42, L43). At this time, for example, when the on-off valve 134 is opened, the exhaust gas from the exhaust manifold 14 can flow directly from the bypass path L61 to the exhaust path L4 without driving the turbine 33 of the exhaust turbine supercharger 131.

  The exhaust gas treatment device 130 is directed to the exhaust path L4 toward the downstream side in the flow direction of the exhaust gas, the fluid desulfurization device 42, the first heat exchanger 43, the bag filter 44, the denitration device 45, and the second heat exchanger 46. The chimney 47 is provided in order. Further, the exhaust gas treatment device 130 is provided with detour paths L61, L62, L63 and on-off valves 134, 135, 136 in the exhaust turbine superchargers 131, 132, 133 as the booster of the present invention.

  Therefore, when the on-off valve 134 is opened and a part of the exhaust manifold 14 exhaust gas flows directly from the bypass path L61 to the exhaust path L4, the exhaust gas discharged to the exhaust path L4 has a higher pressure than when the turbine is driven. Yes. That is, the exhaust gas can be boosted by exhausting the exhaust gas to the exhaust path L4 without driving the turbine with a part of the exhaust gas. The pressurized exhaust gas is introduced into the fluid desulfurization device 42, and sulfur oxides in the exhaust gas are reduced or removed. The exhaust gas discharged from the fluid desulfurization device 42 is heat recovered by the first heat exchanger 43, and then unburned components and soot in the exhaust gas are reduced or removed by the bag filter 44. Nitrogen oxides are reduced or eliminated. The exhaust gas discharged from the denitration device 45 is recovered by the second heat exchanger 46 and then discharged from the chimney 47 to the atmosphere. At this time, the exhaust gas is properly discharged by being maintained at a pressure higher than the atmospheric pressure by a predetermined differential pressure immediately before the exit of the chimney 47.

  Thus, in the exhaust gas treatment apparatus of the fifth embodiment, a plurality of exhaust turbine superchargers 131, 132, 133 are provided, and the exhaust gas is discharged so that the pressure of the exhaust gas immediately before the outlet of the chimney 47 becomes a specified pressure. As boosting devices for boosting the pressure, the exhaust gas from the exhaust manifold 14 bypasses the turbine and is introduced into the flow-type desulfurization device 42, and bypass valves L61, L62, and L63, and open / close valves 134 and 135 that open and close the bypass routes L61, L62, and L63, 136.

  Therefore, the exhaust gas is pressurized by being discharged from the detour paths L61, L62, and L63 to the exhaust path L4 without driving the turbine, and can be appropriately discharged from the chimney 47 to the atmosphere. That is, it is possible to ensure a necessary pressure in the exhaust path L4 for treating the exhaust gas and appropriately purify the exhaust gas.

  In the embodiment described above, the dry desulfurization apparatus of the present invention is the fluid desulfurization apparatus 42, 42A. However, the present invention is not limited to this configuration, and may be a bag filter, for example.

  In the above-described embodiment, the booster blower 41 as the blower of the present invention is disposed upstream of the fluid desulfurization device 42, and the incentive fan 111 as the blower of the present invention is disposed between the second heat exchanger 46 and the chimney 47. However, it is not limited to this position, and the blower may be in any position as long as it is arranged upstream of the chimney 47.

  Moreover, although it was set as the exhaust gas processing apparatus which processes the exhaust gas from the diesel engine 11 used as a main engine in embodiment mentioned above, the diesel engine for electric power generation may be sufficient, or a gas engine may be sufficient.

10, 100, 110, 120, 130 Exhaust gas treatment device 11 Diesel engine 12 Cylinder part 13 Intake manifold 14 Exhaust manifold 31, 131, 132, 133 Exhaust turbine supercharger (supercharger)
32 Compressor 33 Turbine 41 Booster blower (pressurizer, blower)
42,42A Fluid desulfurization equipment (dry desulfurization equipment)
43 First heat exchanger 44 Bag filter 45 Denitration device 46 Second heat exchanger 47 Chimney 48 Drive motor (electric motor)
DESCRIPTION OF SYMBOLS 101 Steam turbine 102 Heat exchange path 103 Pump 111 Incentive fan (pressure | voltage riser, blower)
121, 134, 135, 136 On-off valve L1, L3 Intake path L2 Exhaust path L4 Exhaust path (exhaust gas path)
L6, L61, L62, L63

Claims (8)

An exhaust gas path through which the exhaust gas flows;
A dry desulfurization device provided in the exhaust gas path;
A chimney provided on the downstream side in the flow direction of the exhaust gas from the dry desulfurization device in the exhaust gas path;
A booster that boosts the exhaust gas so that the pressure of the exhaust gas immediately before the chimney exit is equal to or higher than a preset specified pressure;
An exhaust gas treatment apparatus comprising:   The exhaust gas treatment apparatus according to claim 1, wherein the booster is a blower provided upstream of the dry desulfurization device in the exhaust gas path in the flow direction of the exhaust gas.   The exhaust gas treatment device according to claim 2, wherein a denitration device is provided between the dry desulfurization device and the chimney in the exhaust gas path.   The exhaust gas treatment device according to claim 1, wherein the booster is a blower provided between the dry desulfurization device and the chimney in the exhaust gas path.   5. The heat exchanger according to claim 2, wherein a heat exchanger that generates steam by exchanging heat with the exhaust gas is provided in the exhaust gas path, and the blower is driven by the steam generated by the heat exchanger. The exhaust gas treatment apparatus according to any one of claims.   The dry desulfurization apparatus is a fluid desulfurization apparatus that removes sulfur oxides in the exhaust gas by causing a large number of particles having desulfurization performance to flow by the exhaust gas introduced therein. The exhaust gas treatment apparatus according to any one of claims 5 to 6.   The exhaust gas path is connected to an exhaust manifold of a marine engine at an upstream side in the flow direction of exhaust gas from the dry desulfurization device, and a turbocharger turbine is provided between the exhaust manifold and the dry desulfurization device, The depressurization path which bypasses the turbine and introduces the exhaust gas of the exhaust manifold into the dry desulfurization device as a booster, and the on-off valve which opens and closes the detour path are provided. Exhaust gas treatment equipment.   In the exhaust gas path, the upstream side of the flow direction of the exhaust gas from the dry desulfurization device is connected to an exhaust manifold of a marine engine, and turbines of a plurality of superchargers are arranged in parallel between the exhaust manifold and the dry desulfurization device. A plurality of bypass paths that bypass the turbines and introduce the exhaust gas from the exhaust manifold to the dry desulfurization apparatus, and a plurality of on-off valves that respectively open and close the plurality of bypass paths. The exhaust gas treatment apparatus according to claim 1, wherein the exhaust gas treatment apparatus is provided.

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