Combustion equipment systems, ships

Abstract

The system should have the necessary performance for adequately treating nitrogen oxides and carbon dioxide, and the equipment size should be well-balanced. [Solution] The combustion system comprises a combustion device for burning fuel, an exhaust gas line through which exhaust gas from the combustion device flows, a discharge line connected to the exhaust gas line for releasing exhaust gas from the exhaust gas line into the atmosphere, a recovery line branched off from the exhaust gas line, a carbon dioxide recovery device connected to the recovery line for recovering carbon dioxide contained in the exhaust gas from the exhaust gas line, and a denitrification device provided upstream of the carbon dioxide recovery device in the recovery line for processing nitrogen oxides contained in the exhaust gas.

Description

Technical Field

[0001] The present disclosure relates to a combustion device system and a ship.

Background Art

[0002] Patent Document 1 discloses a carbon dioxide recovery device that recovers carbon dioxide from exhaust gas generated by burning natural gas.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, the exhaust gas generated by burning fuels such as natural gas as in Patent Document 1 contains nitrogen oxides (NOx). Therefore, prior to releasing the exhaust gas into the atmosphere, it is necessary to perform a process of reducing the concentration of nitrogen oxides in the exhaust gas with a denitration device. However, depending on the performance of the denitration device, the nitrogen oxides in the exhaust gas may not be removed to the specified value. For this reason, depending on the performance of the denitration device employed, the exhaust gas containing nitrogen oxides may be introduced into the carbon dioxide recovery device. Then, nitrogen oxides will remain in the carbon dioxide recovered by the carbon dioxide recovery device. On the other hand, if an attempt is made to remove more nitrogen oxides, it will lead to an increase in the size of the denitration device.

[0005] Furthermore, when both a denitrification system and a carbon dioxide recovery system are installed, each system must be sized according to the amount of exhaust gas to be treated. The size of the denitrification system and carbon dioxide recovery system also affects costs and the amount of installation space required. In addition, the emissions of nitrogen oxides and carbon dioxide must be kept below the prescribed regulatory limits. Therefore, there is a challenge in balancing the necessary performance and size of the denitrification system and carbon dioxide recovery system.

[0006] This disclosure was made to solve the above-mentioned problems and aims to provide a combustion system and a ship that can achieve a good balance between the performance necessary for adequately treating nitrogen oxides and carbon dioxide and the scale of the equipment. [Means for solving the problem]

[0007] To solve the above problems, the combustion system and ship according to this disclosure comprises a combustion device, an exhaust gas line, a discharge line, a recovery line, a carbon dioxide recovery device, and a denitrification device. The combustion device burns fuel. The exhaust gas line through which exhaust gas from the combustion device flows. The discharge line is connected to the exhaust gas line and releases the exhaust gas from the exhaust gas line into the atmosphere. The recovery line is branched and connected to the exhaust gas line. The carbon dioxide recovery device is connected to the recovery line and recovers carbon dioxide contained in the exhaust gas from the exhaust gas line. The denitrification device is provided upstream of the carbon dioxide recovery device in the recovery line. The denitrification device processes nitrogen oxides contained in the exhaust gas.

[0008] The vessel relating to this disclosure comprises a hull and a combustion system as described above. [Effects of the Invention]

[0009] The combustion system and vessels of this disclosure provide a good balance between the performance necessary for adequately treating nitrogen oxides and carbon dioxide and the scale of the equipment. [Brief explanation of the drawing]

[0010] [Figure 1] This is a side view of a vessel equipped with a combustion device system according to an embodiment of the present disclosure. [Figure 2] This figure shows the configuration of a combustion device system according to the first embodiment of this disclosure. [Figure 3] This figure shows the configuration of a combustion device system according to a modified example of the first embodiment of the present disclosure. [Figure 4] This figure shows the configuration of a combustion device system according to the second embodiment of this disclosure. [Figure 5] This figure shows the configuration of a combustion device system according to the third embodiment of this disclosure. [Figure 6] This figure shows the configuration of the combustion device system according to the fourth embodiment of this disclosure. [Figure 7] This figure shows the configuration of the combustion device system according to the fifth embodiment of this disclosure. [Modes for carrying out the invention]

[0011] <First Embodiment> Hereinafter, the combustion apparatus system and vessel according to the embodiments of this disclosure will be described with reference to Figures 1 to 7. (Overall configuration of the ship) As shown in Figure 1, the vessel 1 of this embodiment comprises a hull 2 ​​and a combustion system 20A. Note that the type of vessel 1 in this embodiment is not limited to a specific type. Examples of vessel types for vessel 1 include liquefied gas carriers, ferries, RORO ships, car carriers, passenger ships, etc.

[0012] (Hull structure) The hull 2 has a pair of side plates 3A and 3B forming its outer shell, a bottom 4, and an upper deck 5. The side plates 3A and 3B have a pair of side outer plates forming the left and right sides respectively. The bottom 4 has a bottom outer plate connecting these side plates 3A and 3B. The upper deck 5 is a through deck exposed to the outside, and an upper structure 6 with a living area is formed on this upper deck 5.

[0013] The combustion device 8 is a device that generates thermal energy by burning fuel, and is provided inside the above-mentioned hull 2. Examples of the combustion device 8 include an internal combustion engine used as a main engine for propelling the ship 1, an internal combustion engine used for a power generation facility that supplies electricity to the ship, a boiler that generates steam as a working fluid, and the like.

[0014] An engine casing 9 is provided on the upper deck 5. Inside the engine casing 9, a later-described discharge line 102 and another discharge line 104 are accommodated.

[0015] (Configuration of the combustion device system) FIG. 2 is a diagram showing the configuration of a combustion device system according to the first embodiment of the present disclosure. As shown in FIG. 2, the combustion device system 20A includes the above-mentioned combustion device 8, an exhaust gas line 101, a discharge line 102, a recovery line 103, a supercharger 10, a treatment device 21A, a carbon dioxide recovery device 25, and a denitration device 23.

[0016] The exhaust gas line 101 is connected to an exhaust port (not shown) of the combustion device 8. Exhaust gas from the combustion device 8 flows through this exhaust gas line 101.

[0017] The discharge line 102 is connected to the exhaust gas line 101. The discharge line 102 discharges the exhaust gas from the exhaust gas line 101 to the atmosphere. At least the downstream end of the discharge line 102 in the flow direction of the exhaust gas is accommodated inside the engine casing 9.

[0018] The recovery line 103 is branched and connected to the exhaust gas line 101. The recovery line 103 in this embodiment branches from the connected portion of the exhaust gas line 101 and the discharge line 102.

[0019] The supercharger 10 utilizes the energy of the exhaust gas discharged from the combustion device 8 and pumps air to the combustion device 8. The supercharger 10 is, for example, a turbocharger. The supercharger 10 in this embodiment is provided in the middle of the exhaust gas line 101.

[0020] The processing device 21A is arranged on the upstream side in the flow direction of the exhaust gas from the combustion device 8 with respect to the denitration device 23. The processing device 21A treats nitrogen oxides contained in the exhaust gas from the combustion device 8. As the processing device 21A in this embodiment, a selective catalytic reduction (SCR) device is used. The denitration mechanism in the SCR which is the processing device 21A is the same as that of the denitration device 23 described later. Note that, in the processing device 21A, a reducing agent different from that of the denitration device 23 may be used.

[0021] The processing device 21A in this embodiment is provided in the exhaust gas line 101. The processing device 21A may be directly connected to the exhaust port of the combustion device 8, but in this case, it can also be said that the processing device 21A is provided at the proximal end of the exhaust gas line 101 on the side close to the combustion device 8.

[0022] The processing device 21A in this embodiment is arranged on the upstream side in the flow direction of the exhaust gas with respect to the supercharger 10. When the combustion device 8 is a two-stroke engine, the exhaust gas temperature is lower compared to a four-stroke engine. In this case, by arranging the processing device 21A on the upstream side in the flow direction of the exhaust gas with respect to the supercharger 10, the exhaust gas can be sent into the processing device 21A while suppressing the temperature drop of the exhaust gas, and the treatment of nitrogen oxides can be performed well.

[0023] (Configuration of Carbon Dioxide Recovery Device) The carbon dioxide recovery device 25 is connected to the recovery line 103. The carbon dioxide recovery device 25 is installed, for example, on the upper deck 5. The carbon dioxide recovery device 25 may also be housed inside the hull 2. Exhaust gas is fed into the carbon dioxide recovery device 25 from the exhaust gas line 101 through the recovery line 103. The carbon dioxide recovery device 25 recovers carbon dioxide contained in the exhaust gas fed into the recovery line 103.

[0024] One method for recovering carbon dioxide in the carbon dioxide recovery device 25 is a chemical absorption method in which carbon dioxide is absorbed by an absorbent liquid. In the case of chemical absorption of carbon dioxide, MEA (monoethanolamine) can be used as an example of an absorbent liquid. The configuration of the carbon dioxide recovery device 25 is not limited in any way. The size of the carbon dioxide recovery device 25 is set according to the amount of exhaust gas sent from the exhaust gas line 101 through the recovery line 103.

[0025] After carbon dioxide has been absorbed into the absorbent liquid by the carbon dioxide recovery device 25, the exhaust gas is released into the atmosphere through another discharge line 104. Of the other discharge line 104, at least the downstream end in the direction of exhaust gas flow is housed, for example, within the engine casing 9. However, there are no limitations on the location of the downstream end of the discharge line 104.

[0026] (Configuration of the denitrification system) The denitrification unit 23 is located upstream of the carbon dioxide recovery unit 25 in the recovery line 103. The denitrification unit 23 processes nitrogen oxides contained in the exhaust gas sent from the exhaust gas line 101 to the recovery line 103. In this embodiment, a selective catalytic reduction (SCR) is used as the denitrification unit 23. The denitrification unit 23 uses urea as a reducing agent, for example. When urea is injected into the high-temperature exhaust gas in the denitrification unit 23, ammonia and carbon dioxide are produced by the reactions described in (1) and (2) below. CO(NH2)2→ NH3+ HCNO ···(1) HCNO+H2O → NH3+ CO2···(2) In the denitrification unit 23, nitrogen oxides (NOx) are decomposed into nitrogen (N2) and water (H2O) by reacting with the generated ammonia and catalyst. The size of the denitrification unit 23 is set according to the amount of exhaust gas sent from the exhaust gas line 101 through the recovery line 103. In other words, the size of the denitrification unit 23 corresponds to the carbon dioxide recovery capacity of the carbon dioxide recovery unit 25.

[0027] (Operation of the combustion system) In this combustion system 20A, exhaust gas from the combustion device 8 passes through the exhaust gas line 101 and is sent to the treatment device 21A. In the treatment device 21A, nitrogen oxides contained in the exhaust gas are treated. After passing through the treatment device 21A, the exhaust gas passes through the turbocharger 10 and is divided into a discharge line 102 and a recovery line 103. The exhaust gas that flows into the discharge line 102 is released directly into the atmosphere.

[0028] The exhaust gas flowing into the recovery line 103 is sent to the denitrification unit 23. In the denitrification unit 23, nitrogen oxides contained in the exhaust gas that have passed through the treatment device 21A are further processed. The exhaust gas that has passed through the denitrification unit 23 is sent to the carbon dioxide recovery unit 25. In the carbon dioxide recovery unit 25, carbon dioxide contained in the exhaust gas that has been sent in is recovered. In this embodiment, the carbon dioxide recovery unit 25 also recovers carbon dioxide generated from urea in the denitrification unit 23. The exhaust gas from which carbon dioxide has been recovered is released into the atmosphere through another discharge line 104.

[0029] (Effects and Benefits) In the combustion system 20A of the first embodiment described above, the ship 1 is equipped with a denitrification device 23 located upstream of the carbon dioxide recovery device 25 in the recovery line 103 to which the carbon dioxide recovery device 25 is connected. The exhaust gas flowing into the recovery line 103 is treated for nitrogen oxides in the denitrification device 23 before being sent to the carbon dioxide recovery device 25. This suppresses the inclusion of nitrogen oxides in the carbon dioxide recovered by the carbon dioxide recovery device 25. It also suppresses the nitrogen oxides contained in the exhaust gas from which carbon dioxide has been recovered. Furthermore, the recovery line 103 is branched and connected to the exhaust gas line 101. As a result, a portion of the exhaust gas from the combustion device 8 through the exhaust gas line 101 flows into the recovery line 103, where it is processed by the denitrification device 23 and the carbon dioxide recovery device 25, while the remaining exhaust gas is released into the atmosphere through the discharge line 102. Consequently, the denitrification device 23 and the carbon dioxide recovery device 25 do not need to process the entire amount of exhaust gas from the combustion device 8, thus preventing the denitrification device 23 and the carbon dioxide recovery device 25 from becoming excessively large. Therefore, the scale of the denitrification device 23 and the carbon dioxide recovery device 25 can be adjusted to match the required performance, making it easier to balance the required performance of the denitrification device 23 and the carbon dioxide recovery device 25 with the size of the equipment. As a result, a good balance can be achieved between the performance necessary for adequately treating nitrogen oxides and carbon dioxide and the scale of the equipment.

[0030] Furthermore, in the first embodiment described above, by providing the treatment device 21A upstream of the denitrification device 23 in the direction of exhaust gas flow, nitrogen oxides contained in the exhaust gas from the combustion device 8 can be treated by the treatment device 21A, and then further treated by the denitrification device 23 downstream. Therefore, the amount of nitrogen oxides contained in the exhaust gas sent to the carbon dioxide recovery device 25 can be reduced even further.

[0031] Furthermore, in the first embodiment described above, by providing the treatment device 21A in the exhaust gas line 101 into which the entire amount of exhaust gas from the combustion device 8 flows, the nitrogen oxides contained in the entire amount of exhaust gas from the combustion device 8 can be treated by the treatment device 21A. Therefore, the amount of nitrogen oxides contained in the exhaust gas released into the atmosphere from the discharge line 102 can be reduced.

[0032] (Modification of the first embodiment) Figure 3 shows the configuration of a combustion device system according to a modified example of the first embodiment of the present disclosure. As shown in Figure 3, the combustion device system 20A described in the above embodiment may be equipped with a control valve 50 for adjusting the amount of exhaust gas flowing into the recovery line 103. This allows the amount of nitrogen oxides processed in the denitrification unit 23 and the amount of carbon dioxide recovered in the carbon dioxide recovery unit 25 to be adjusted by adjusting the opening of the control valve 50. Therefore, the processing amounts in the denitrification unit 23 and the carbon dioxide recovery unit 25 can be appropriately adjusted according to various regulations, for example. As a result, the operating costs of the denitrification unit 23 and the carbon dioxide recovery unit 25 can be reduced.

[0033] <Second Embodiment> Next, a second embodiment of the combustion device system and vessel according to this disclosure will be described. In the second embodiment described below, only the configuration of the combustion device system differs from that of the first embodiment, so the same reference numerals are used for the same parts as in the first embodiment, and redundant explanations are omitted.

[0034] (Configuration of the combustion system) Figure 4 shows the configuration of a combustion device system according to the second embodiment of this disclosure. As shown in Figure 4, the combustion system 20B includes the combustion device 8, an exhaust gas line 101, a discharge line 102, a recovery line 103, a turbocharger 10, a treatment device 21B, a carbon dioxide recovery device 25, and a denitrification device 23. The combustion system 20B in this embodiment differs from the combustion system 20A in the first embodiment in that it includes a treatment device 21B instead of a treatment device 21A.

[0035] The treatment device 21B processes nitrogen oxides contained in the exhaust gas from the combustion device 8. In this embodiment, an exhaust gas recirculation (EGR) device is used as the treatment device 21B. The EGR device 21B recirculates a portion of the exhaust gas flowing through the exhaust gas line 101 to the intake side of the combustion device 8 through the return line 105. One end of the return line 105 is connected to the treatment device 21B. The other end of the return line 105 may be connected to the intake side of the turbocharger 10 that supplies air to the combustion device 8, or it may be connected to the discharge side of the turbocharger 10. The combustion device 8 burns the exhaust gas recirculated through the return line 105 together with the air supplied from the turbocharger 10, along with fuel, to process the nitrogen oxides contained in the exhaust gas.

[0036] (Effects and Benefits) In the combustion device system 20B and ship 1 of the second embodiment described above, a good balance can be achieved between the performance necessary to adequately treat nitrogen oxides and carbon dioxide and the scale of the device, similar to the first embodiment described above.

[0037] <Third Embodiment> Next, a third embodiment of the combustion device system and vessel according to this disclosure will be described. In the third embodiment described below, only the configuration of the combustion device system differs from that of the first embodiment, so the same reference numerals are used for the same parts as in the first embodiment, and redundant explanations are omitted.

[0038] (Configuration of the combustion system) Figure 5 shows the configuration of a combustion device system according to the third embodiment of this disclosure. As shown in Figure 5, the combustion system 20C comprises the combustion device 8, an exhaust gas line 101, a discharge line 102, a recovery line 103, a turbocharger 10, a treatment device 21A, a carbon dioxide recovery device 25, and a denitrification device 23.

[0039] In this third embodiment, the supercharger 10 is located in the discharge line 102.

[0040] In this combustion system 20C, exhaust gas from the combustion device 8 passes through the exhaust gas line 101 and is sent to the treatment device 21A. In the treatment device 21A, nitrogen oxides contained in the exhaust gas are treated. After passing through the treatment device 21A, the exhaust gas is divided into a discharge line 102 and a recovery line 103. The exhaust gas that flows into the discharge line 102 passes through the turbocharger 10 and is released directly into the atmosphere.

[0041] Meanwhile, the exhaust gas that flows into the recovery line 103 is sent to the denitrification unit 23. In the denitrification unit 23, nitrogen oxides contained in the exhaust gas that has passed through the treatment device 21A are further processed. When the combustion device 8 is a two-stroke engine, the exhaust gas temperature is lower compared to a four-stroke engine. In this case, by sending the exhaust gas, which remains at a high temperature without being worked by the supercharger 10, to the recovery line 103 upstream of the supercharger 10, the nitrogen oxides in the denitrification unit 23 can be processed efficiently. The exhaust gas that has passed through the denitrification unit 23 is sent to the carbon dioxide recovery unit 25. In the carbon dioxide recovery unit 25, carbon dioxide contained in the exhaust gas that has been sent in is recovered. The exhaust gas from which carbon dioxide has been recovered is released into the atmosphere through another discharge line 104.

[0042] (Effects and Benefits) In the combustion device system 20C and ship 1 of the third embodiment described above, a good balance can be achieved between the performance necessary to adequately treat nitrogen oxides and carbon dioxide and the scale of the device, similar to the first embodiment described above.

[0043] <Fourth Embodiment> Next, a fourth embodiment of the combustion device system and vessel according to this disclosure will be described. In the fourth embodiment described below, only the configuration of the combustion device system differs from that of the first embodiment, so the same reference numerals are used for the same parts as in the first embodiment, and redundant explanations are omitted.

[0044] (Configuration of the combustion system) Figure 6 shows the configuration of a combustion device system according to the fourth embodiment of this disclosure. As shown in Figure 6, the combustion system 20D comprises the combustion device 8, an exhaust gas line 101, a discharge line 102, a recovery line 103, a turbocharger 10, a treatment device 21A, a carbon dioxide recovery device 25, and a denitrification device 23.

[0045] In this fourth embodiment, the treatment device 21A is located downstream of the turbocharger 10 in the exhaust gas flow direction of the exhaust gas line 101.

[0046] In this combustion system 20D, exhaust gas from the combustion device 8 passes through the exhaust gas line 101, then through the turbocharger 10, and is sent to the treatment device 21A. In the treatment device 21A, nitrogen oxides contained in the exhaust gas are treated. After passing through the treatment device 21A, the exhaust gas is divided into a discharge line 102 and a recovery line 103. The exhaust gas that flows into the discharge line 102 is released directly into the atmosphere.

[0047] Meanwhile, the exhaust gas that flows into the recovery line 103 is sent to the denitrification unit 23. In the denitrification unit 23, nitrogen oxides contained in the exhaust gas that has passed through the treatment device 21A are further processed. The exhaust gas that has passed through the denitrification unit 23 is sent to the carbon dioxide recovery unit 25. In the carbon dioxide recovery unit 25, carbon dioxide contained in the exhaust gas that has been sent in is recovered. The exhaust gas from which carbon dioxide has been recovered is released into the atmosphere through another discharge line 104.

[0048] (Effects and Benefits) In the combustion device system 20D and ship 1 of the fourth embodiment described above, as in the first embodiment described above, it is possible to achieve a good balance between the performance necessary to adequately treat nitrogen oxides and carbon dioxide and the scale of the device.

[0049] Furthermore, in the fourth embodiment described above, the treatment device 21A is located downstream of the turbocharger 10 in the exhaust gas flow direction in the exhaust gas line 101. Therefore, the combustion device system 20D can be configured by adding the treatment device 21A downstream of the exhaust gas flow direction in the existing combustion device 8 equipped with the turbocharger 10, and by adding the recovery line 103, the denitrification device 23, and the carbon dioxide recovery device 25.

[0050] <Fifth Embodiment> Next, a fifth embodiment of the combustion device system and vessel according to this disclosure will be described. In the fifth embodiment described below, only the configuration of the combustion device system differs from that of the first embodiment, so the same reference numerals are used for the same parts as in the first embodiment, and redundant explanations are omitted.

[0051] (Configuration of the combustion system) Figure 7 shows the configuration of the combustion device system according to the fifth embodiment of this disclosure. As shown in Figure 7, the combustion system 20E comprises the combustion device 8, an exhaust gas line 101, a discharge line 102, a recovery line 103, a turbocharger 10, a treatment device 21A, a carbon dioxide recovery device 25, and a denitrification device 23.

[0052] In this fifth embodiment, the processing apparatus 21A is provided in the discharge line 102.

[0053] In this type of combustion system 20E, exhaust gas from the combustion device 8 passes through the exhaust gas line 101 and the turbocharger 10, before being split into a discharge line 102 and a recovery line 103. The exhaust gas that flows into the discharge line 102 is sent to the treatment device 21A. In the treatment device 21A, nitrogen oxides contained in the exhaust gas are treated. The exhaust gas that has passed through the treatment device 21A is released into the atmosphere.

[0054] The exhaust gas that flows into the recovery line 103 is sent to the denitrification unit 23. In the denitrification unit 23, nitrogen oxides contained in the exhaust gas are processed. The exhaust gas that has passed through the denitrification unit 23 is sent to the carbon dioxide recovery unit 25. In the carbon dioxide recovery unit 25, carbon dioxide contained in the exhaust gas that has been sent in is recovered. The exhaust gas from which carbon dioxide has been recovered is released into the atmosphere through another discharge line 104.

[0055] (Effects and Benefits) In the combustion device system 20E and ship 1 of the fifth embodiment described above, as in the first embodiment described above, it is possible to achieve a good balance between the performance necessary to adequately treat nitrogen oxides and carbon dioxide and the scale of the device.

[0056] Furthermore, in the fifth embodiment described above, by providing the treatment device 21A in the discharge line 102, the amount of nitrogen oxides contained in the exhaust gas released into the atmosphere from the discharge line 102 can be reduced.

[0057] (Other embodiments) Although embodiments of this disclosure have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments and may include design changes and the like that do not depart from the gist of this disclosure. In the above embodiments, urea was used as the reducing agent in the denitrification device 23 and the selective reduction catalyst device 21A, but ammonia may also be used as the reducing agent. When ammonia is used as the reducing agent, carbon dioxide, which is produced when urea is used as the reducing agent, is not generated, thus reducing the amount of carbon dioxide recovered by the carbon dioxide recovery device 25. In addition, other substances may be used as the reducing agent, not just ammonia and urea.

[0058] In the embodiments described above, treatment devices 21A and 21B are provided. However, a bypass line is provided to bypass treatment devices 21A and 21B, so that the exhaust gas from the combustion device 8 is not treated by treatment devices 21A and 21B depending on various operating conditions. Alternatively, treatment devices 21A and 21B may be omitted.

[0059] Furthermore, in the above embodiment, a burner or the like may be provided upstream of the denitrification device 23 to heat the exhaust gas sent to the denitrification device 23 and to promote the treatment of nitrogen oxides in the denitrification device 23.

[0060] Furthermore, in the above embodiment, heat exchangers may be provided in the discharge line 102 and other discharge lines 104 to recover the thermal energy contained in the exhaust gas released into the atmosphere.

[0061] Furthermore, in each of the above embodiments, the combustion device systems 20A to 20E are provided on the ship 1, but this is not limited to this. As long as a combustion device 8 is provided, the combustion device systems 20A to 20E may be provided on a floating body or on land-based facility.

[0062] <Note> The combustion apparatus systems 20A to 20E and the ship 1 described in each embodiment can be understood, for example, as follows.

[0063] (1) The combustion device systems 20A to 20E according to the first embodiment include a combustion device 8 for burning fuel, an exhaust gas line 101 through which exhaust gas from the combustion device 8 flows, a discharge line 102 connected to the exhaust gas line 101 for releasing the exhaust gas from the exhaust gas line 101 into the atmosphere, a recovery line 103 branched off from the exhaust gas line 101, a carbon dioxide recovery device 25 connected to the recovery line 103 for recovering carbon dioxide contained in the exhaust gas from the exhaust gas line 101, and a denitrification device 23 provided upstream of the carbon dioxide recovery device 25 in the recovery line 103 for processing nitrogen oxides contained in the exhaust gas. It is equipped with.

[0064] This reduces the amount of nitrogen oxides contained in the carbon dioxide recovered by the carbon dioxide recovery device 25. It also reduces the amount of nitrogen oxides contained in the exhaust gas from which the carbon dioxide was recovered. Furthermore, since the recovery line 103 is branched and connected to the exhaust gas line 101, a portion of the exhaust gas from the combustion device 8 through the exhaust gas line 101 flows into the recovery line 103, where it is processed by the denitrification device 23 and the carbon dioxide recovery device 25, while the remaining exhaust gas is released into the atmosphere through the discharge line 102. Therefore, the denitrification device 23 and the carbon dioxide recovery device 25 do not need to process the entire amount of exhaust gas from the combustion device 8, thus preventing the denitrification device 23 and the carbon dioxide recovery device 25 from becoming excessively large. Consequently, it becomes possible to design the denitrification device 23 and the carbon dioxide recovery device 25 to have a scale appropriate to the required performance, making it easier to balance the required performance of the denitrification device 23 and the carbon dioxide recovery device 25 with the size of the device. As a result, we can provide combustion system systems 20A to 20E that offer a good balance between the performance necessary for adequately treating nitrogen oxides and carbon dioxide and the scale of the equipment.

[0065] (2) The combustion device systems 20A to 20E according to the second embodiment are the combustion device systems 20A to 20E of (1), further comprising treatment devices 21A and 21B arranged upstream of the denitrification device 23 in the flow direction of the exhaust gas, for treating nitrogen oxides contained in the exhaust gas from the combustion device 8. Examples of treatment devices 21A and 21B include selective catalytic reduction (SCR) and exhaust gas recirculation (EGR).

[0066] As a result, by equipping the denitrification unit 23 with treatment devices 21A and 21B upstream in the exhaust gas flow direction, nitrogen oxides contained in the exhaust gas from the combustion unit 8 can be treated by treatment devices 21A and 21B, and then further treated by the downstream denitrification unit 23. Therefore, the amount of nitrogen oxides contained in the exhaust gas sent to the carbon dioxide recovery unit 25 can be further reduced.

[0067] (3) The combustion device systems 20A to 20D according to the third embodiment are the combustion device systems 20A to 20D of (2), wherein the treatment devices 21A to 21D are provided in the exhaust gas line 101.

[0068] With this configuration, by installing treatment devices 21A to 21D in the exhaust gas line 101 into which the entire amount of exhaust gas from the combustion device 8 flows, the nitrogen oxides contained in the entire amount of exhaust gas from the combustion device 8 can be treated by the treatment devices 21A to 21D. Therefore, the amount of nitrogen oxides contained in the exhaust gas released into the atmosphere from the discharge line 102 can be reduced.

[0069] (4) The combustion apparatus system 20E according to the fourth embodiment is the combustion apparatus system 20E of (2), wherein the processing apparatus 21A is provided in the discharge line 102.

[0070] This reduces the amount of nitrogen oxides contained in the exhaust gas released into the atmosphere from the discharge line 102.

[0071] (5) The vessel 1 according to the fifth embodiment comprises a hull 2 ​​and one of the combustion device systems 20A to 20E from (1) to (4).

[0072] This makes it possible to provide a vessel 1 equipped with combustion system 20A to 20E that can strike a good balance between the performance necessary for adequately treating nitrogen oxides and carbon dioxide and the scale of the equipment. [Explanation of Symbols]

[0073] 1 ship 2 hull 3A, 3B side 4. Bottom of the ship 5 Upper Deck 6 Superstructure 8 Combustion device 9. Engine casing 10 Supercharger 20A~20E Combustion System 21A, 21B Processing Units 23 Denitration equipment 25 Carbon dioxide capture device 50 Adjustment valve 101 Exhaust gas line 102 Release Line 103 Collection Line 104 Release Line 105 Return Line

Claims

1. A combustion device that burns fuel, An exhaust gas line through which exhaust gas from the aforementioned combustion device flows, A discharge line connected to the exhaust gas line and releasing the exhaust gas from the exhaust gas line into the atmosphere, A recovery line branched off and connected to the aforementioned exhaust gas line, A carbon dioxide recovery device connected to the aforementioned recovery line, which recovers carbon dioxide contained in the exhaust gas from the exhaust gas line, A denitrification device is provided upstream of the carbon dioxide recovery device in the recovery line, and is used to treat nitrogen oxides contained in the exhaust gas. A combustion device system equipped with the following features.

2. The apparatus further comprises a treatment device positioned upstream of the exhaust gas flow direction relative to the denitrification device, for treating nitrogen oxides contained in the exhaust gas from the combustion device. The combustion apparatus system according to claim 1.

3. The treatment apparatus is installed in the exhaust gas line. The combustion apparatus system according to claim 2.

4. The processing apparatus is provided in the discharge line. The combustion apparatus system according to claim 2.

5. The hull and, A combustion device system according to claim 1 or 2, comprising ship.

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