Ammonia gas diesel dual fuel boiler for ships

Abstract

A marine ammonia diesel dual fuel boiler. It relates to the field of marine boiler. When the existing ammonia gas fuel is used as the fuel of the auxiliary boiler of the ship, the heat value of the ammonia gas as the fuel is low, the steam production demand is large, the heating surface size is large, the overall size of the boiler is large, and the arrangement on the ship is not conducive to the problem. The utility model discloses a furnace body, furnace wall, water cooling wall and evaporation pipe bundle, and is characterized by furnace wall including front furnace wall and rear furnace wall, front furnace wall, rear furnace wall, water cooling wall and evaporation pipe bundle close to the side of water cooling wall are enclosed and form the hearth area, the marine ammonia diesel dual fuel boiler also includes ammonia gas storage tank, diesel oil storage tank, ammonia gas burner and diesel oil burner, ammonia gas storage tank is connected with ammonia gas burner through separate pipeline, and ammonia gas fuel is sent into the hearth area and burns, and diesel oil storage tank is connected with diesel oil burner through separate pipeline, and diesel oil fuel is sent into the hearth area and burns. The utility model is applied to the field of marine ammonia diesel dual fuel boiler.

Description

Technical Field

[0001] This utility model relates to the field of marine boilers, specifically to a marine ammonia-diesel dual-fuel boiler. Background Technology

[0002] Ammonia fuel is easy to store and inexpensive. Ammonia is one of the most common, readily available, and cheap compounds.

[0003] Ammonia has a calorific value of approximately 14.3 MJ / kg, lower than that of traditional fuel oils. Ammonia can be liquefied under normal pressure (approximately 8-10 atmospheres) or at low temperatures (-33.4°C), significantly reducing its volume and facilitating transportation and storage. Liquid ammonia is chemically relatively stable and does not readily ignite or decompose. Therefore, based on these characteristics, ammonia fuel is well-suited for use as fuel in marine auxiliary boilers.

[0004] Currently, when the steam production demand of marine auxiliary boilers is high, more ammonia needs to be burned to provide sufficient heat due to the low calorific value of ammonia. According to the principle of heat transfer, a larger heating surface area is needed to effectively transfer the heat generated by the combustion of more ammonia to the working fluid (water) to produce steam. This is because a larger heating surface area results in a larger heat exchange area, allowing for more efficient transfer of the heat generated by the combustion of ammonia to the working fluid and meeting the steam production requirements.

[0005] For example, assuming a traditional oil-fired boiler requires Q heat to produce a certain amount of steam, the calorific value of the oil is q1, and the required oil mass is m1, then m1 = 5Q / q1. If ammonia is used as fuel, with a calorific value of q2 (q2 < q1), to produce the same amount of heat Q, the required ammonia mass is m2 = 5Q / q2, which is clearly greater than m1. To effectively transfer the heat from the combustion of m2 masses of ammonia, a larger heating surface is needed. Increasing the size of the heating surface will correspondingly increase the size of the boiler's furnace, evaporator, superheater, and other components, resulting in a larger overall boiler volume. This makes it difficult to arrange rationally within the limited space on a ship, increasing the complexity of ship design and operation. Utility Model Content

[0006] This invention addresses the problem that existing marine auxiliary boilers using ammonia as fuel have a low calorific value, and require a large heating surface area when steam production is demanded, resulting in a large overall boiler size that is inconvenient for shipboard installation. Therefore, this invention provides a marine ammonia-diesel dual-fuel boiler.

[0007] The technical solution of this utility model is:

[0008] A marine ammonia-diesel dual-fuel boiler comprises a boiler body, a furnace wall, a water-cooled wall, and an evaporator tube bundle. The furnace wall includes a front furnace wall and a rear furnace wall. The front furnace wall, rear furnace wall, water-cooled wall, and the evaporator tube bundle near the water-cooled wall together form a furnace chamber area, which is a combustion zone.

[0009] The marine ammonia-diesel dual-fuel boiler also includes an ammonia storage tank, a diesel storage tank, an ammonia burner, and a diesel burner;

[0010] The ammonia storage tank is connected to the ammonia burner via a separate pipeline, which delivers ammonia fuel into the furnace area for combustion. The diesel storage tank is connected to the diesel burner via a separate pipeline, which delivers diesel fuel into the furnace area for combustion.

[0011] Furthermore, the marine ammonia-diesel dual-fuel boiler also includes two outer shells and two inner shells;

[0012] The two outer shells and two inner shells together form two air gaps, which are respectively arranged on the outside of the front furnace wall and the rear furnace wall.

[0013] Furthermore, the ammonia burner and the diesel burner are respectively installed on the outer shells of the two air-jacketed structures;

[0014] Furthermore, one ammonia burner and one diesel burner, or two ammonia burners and two diesel burners, can be arranged on the front furnace wall and the rear furnace wall. The two ammonia burners can share one ammonia storage tank, and the two diesel burners can share one diesel storage tank.

[0015] Furthermore, the marine ammonia-diesel dual-fuel boiler is surrounded by an insulation layer.

[0016] The insulation layers of the front and rear furnace walls are pressed against the inner shell by bolt assemblies, and the insulation layers at that location are pressed against the inner shell by the inner shell.

[0017] Furthermore, the top of the evaporator tube bundle in the marine ammonia-diesel dual-fuel boiler is connected to the upper drum, the bottom of the evaporator tube bundle is connected to the lower drum, and a downcomer is connected between the upper drum and the lower drum.

[0018] The downcomer is located within two air gaps.

[0019] Furthermore, the marine ammonia-diesel dual-fuel boiler also includes a flue;

[0020] The ammonia storage tank delivers fuel and air into the furnace via an ammonia burner, and the diesel storage tank delivers fuel and air via a diesel burner. The flue gas generated by combustion in the furnace washes over the surface of the evaporator tube bundle and is discharged from the flue.

[0021] Furthermore, the marine ammonia-diesel dual-fuel boiler also includes a platform ladder;

[0022] The platform ladder is located above the furnace area.

[0023] Furthermore, the marine ammonia-diesel dual-fuel boiler also includes a manhole and a fire observation hole;

[0024] The manhole is located on the front furnace wall or the rear furnace wall, and the observation hole is located in the middle of the front furnace wall or the rear furnace wall.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] This invention provides a flexible arrangement of diesel and ammonia burners, allowing for one burner on each of the front and rear furnace walls. Two air jackets are formed by the outer and inner shells, respectively located on the outer sides of the front and rear furnace walls. In diesel combustion scenarios, when the diesel burner has a cyclone inlet, the air jacket structure introduces air through the cyclone inlet, creating airflow circulation in conjunction with the jackets. This enhances air mixing during combustion, shortens the flame length to ensure furnace safety, and improves combustion efficiency.

[0027] This invention can be used solely for ammonia combustion, in which case the steam output is 13 t / h and the ammonia consumption is approximately 3000 m³ / h. When using only diesel fuel, the steam output can reach 16 t / h, and the diesel consumption is approximately 1100 kg / h. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of this utility model;

[0029] Figure 2 yes Figure 1 AA section view;

[0030] Figure 3 yes Figure 1 Top view;

[0031] Figure 4 yes Figure 2 A magnified view of part B in the image;

[0032] Figure 5 yes Figure 2 A magnified view of part C in the image;

[0033] In the diagram: 1. Furnace area, 2. Water-cooled wall, 3. Evaporator tube bundle, 4. Front furnace wall, 5. Rear furnace wall, 6. Ammonia storage tank, 7. Diesel storage tank, 8. Ammonia burner, 9. Diesel burner, 10. Outer shell, 11. Inner shell, 12. Air jacket, 13. Insulation layer, 14. Upper boiler drum, 15. Lower boiler drum, 16. Downcomer, 17. Flue, 18. Platform ladder, 19. Manhole, 20. Observation hole. Detailed Implementation

[0034] The accompanying drawings in the embodiments clearly and completely describe the technical solutions in the embodiments. The following embodiments are used to illustrate the present utility model, but are not intended to limit the scope of the present utility model. Specific implementation method one:

[0036] Combination Figure 1 — Figure 5 This embodiment describes a marine ammonia-diesel dual-fuel boiler, which comprises a boiler body, a furnace wall, a water-cooled wall 2, and an evaporator tube bundle 3. The furnace wall includes a front furnace wall 4 and a rear furnace wall 5. The front furnace wall 4, the rear furnace wall 5, the water-cooled wall 2, and the evaporator tube bundle 3 near the water-cooled wall 2 together form a furnace region 1, which is a combustion region.

[0037] The marine ammonia-diesel dual-fuel boiler also includes an ammonia storage tank 6, a diesel storage tank 7, an ammonia burner 8, and a diesel burner 9;

[0038] The boiler produces steam at a pressure of 1.6 MPa, using saturated steam. Its rated steam output is 16 t / h, with a flue gas temperature of 300℃ and a boiler efficiency of 82%. The boiler's dimensions (length x width x height) are 3671 mm x 3140 mm x 3995 mm. The boiler weighs approximately 18 tons. The minimum feedwater temperature is 30℃. It uses ammonia and No. 0 diesel fuel. Ammonia has a calorific value of 14300 kJ / m³, and No. 0 diesel fuel has a calorific value of 42900 kJ / kg. Therefore, the burner arrangement is flexible; one burner can be installed on each of the front and rear furnace walls, or two burners can be installed on each wall. Specific Implementation Method Two:

[0040] Combination Figure 1 — Figure 5 This embodiment describes a marine ammonia-diesel dual-fuel boiler, which further includes two outer shells 10 and two inner shells 11.

[0041] Two outer shells 10 and two inner shells 11 together form two air gaps 12, and the two air gaps 12 are respectively arranged on the outside of the front furnace wall 4 and the rear furnace wall 5.

[0042] This invention comprises two air jackets 12 formed by the outer shell 10 and the inner shell 11, respectively arranged on the outer sides of the front furnace wall 4 and the rear furnace wall 5. In a diesel combustion scenario, when the diesel burner 9 has a cyclone inlet, the air jacket structure is used to introduce air through the cyclone inlet, forming an airflow circulation with the jacket, enhancing the air mixing effect during combustion, shortening the flame combustion length to ensure furnace safety, and improving combustion efficiency. Specific implementation method three:

[0044] Combination Figure 1 — Figure 5 This embodiment describes a marine ammonia-diesel dual-fuel boiler, wherein the ammonia burner 8 and the diesel burner 9 are respectively installed on the outer shells of two air jackets 12;

[0045] The ammonia burner 8 first introduces ammonia fuel and the diesel burner 9 first introduces diesel fuel into the air jacket 12, and then into the furnace area 1 for combustion.

[0046] The ammonia storage tank 6 is connected to the ammonia burner 8 via a separate pipeline, which delivers ammonia fuel into the furnace area 1 for combustion. The diesel storage tank 7 is connected to the diesel burner 9 via a separate pipeline, which delivers diesel fuel into the furnace area 1 for combustion.

[0047] The ammonia storage tank 6, ammonia burner 8, and diesel storage tank 7, diesel burner 9 are used together for fuel supply and combustion. Ammonia is supplied from the ammonia storage tank 6 and passes through the ammonia burner 8, while diesel is supplied from the diesel storage tank 7 and passes through the diesel burner 9. The fuel is mixed and burned, allowing for flexible burner arrangement. The front furnace 4 and rear furnace wall 5 can be installed as needed, corresponding to the burners. Fuel is injected into the furnace area 1 through the burners for combustion, releasing heat. Specific implementation method four:

[0049] Combination Figure 1 — Figure 5 This embodiment describes a marine ammonia-diesel dual-fuel boiler. One ammonia burner 8 and one diesel burner 9, or two ammonia burners 8 and two diesel burners 9, can be arranged on the front furnace wall 4 and the rear furnace wall 5. The two ammonia burners 8 can share an ammonia storage tank 6, and the two diesel burners 9 can share a diesel storage tank 7.

[0050] This utility model's boiler generates steam at a pressure of 1.6 MPa, producing saturated steam. Its rated steam output is 16 t / h, with a flue gas temperature of 300℃ and a boiler efficiency of 82%. The boiler's dimensions (length x width x height) are 3671 x 3140 x 3995 mm. The boiler weighs approximately 18 tons. The minimum feedwater temperature is 30℃. It uses ammonia and No. 0 diesel fuel; the calorific value of ammonia is 14300 kJ / m³, and the calorific value of No. 0 diesel fuel is 42900 kJ / kg. Specific implementation method five:

[0052] Combination Figure 1 — Figure 5 This embodiment describes a marine ammonia-diesel dual-fuel boiler, wherein the marine ammonia-diesel dual-fuel boiler is provided with an insulation layer 13 around its perimeter.

[0053] Among them, the insulation layer 13 of the front furnace wall 4 and the rear furnace wall 5 is pressed against the inner shell 11 by bolt assembly, and the insulation layer 13 at this location is pressed by the inner shell 11. Specific implementation method six:

[0055] Combination Figure 1 — Figure 5 This embodiment describes a marine ammonia-diesel dual-fuel boiler. The top of the evaporator tube bundle 3 is connected to the upper drum 14, and the bottom of the evaporator tube bundle 3 is connected to the lower drum 15. A downcomer 16 is connected between the upper drum 14 and the lower drum 15.

[0056] The downcomer is located within two air gaps.

[0057] The heat generated by combustion heats the water-cooled wall 2 and the evaporator tube bundle 3, thus heating the boiler water. The upper boiler drum 14, the lower boiler drum 15, and the downcomer 16 form a circulation loop. The boiler water flows through the downcomer 16 to the lower boiler drum 15, and after being heated, it rises along the water-cooled wall and the evaporator tube bundle to the upper boiler drum 14, realizing steam-water circulation and continuously generating steam. Specific implementation method seven:

[0059] Combination Figure 1 — Figure 5 This embodiment describes a marine ammonia-diesel dual-fuel boiler, which further includes a flue 17.

[0060] The flue gas generated by combustion in the furnace area washes over the surface of the evaporator tube bundle 3, and the flue gas is discharged from the flue 17.

[0061] The boiler includes a flue 17. Ammonia storage tank 6 delivers fuel and air into the furnace via ammonia burner 8 and diesel storage tank 7 via diesel burner 9. The flue gas generated by combustion in the furnace area washes the surface of the evaporator tube bundle 3 and is then discharged through the flue 17. Combustion generates heat and flue gas exchanges heat, which is suitable for the space and energy needs of ships. Detailed implementation method eight:

[0063] Combination Figure 1 — Figure 5 This embodiment describes a marine ammonia-diesel dual-fuel boiler, which further includes a platform ladder 18.

[0064] The platform ladder 18 is located above the furnace area 1. The platform ladder 18 facilitates operators' access to the boiler and the areas where the boiler needs to be operated. Specific implementation method nine:

[0066] Combination Figure 1 — Figure 5 This embodiment describes a marine ammonia-diesel dual-fuel boiler, which further includes a manhole 19 and a fire observation hole 20.

[0067] The manhole door 19 is provided to facilitate workers to enter the furnace for maintenance.

[0068] The observation hole 20 can be used by external personnel to observe the flame situation during combustion inside the boiler.

[0069] The manhole is located on the front furnace wall or the rear furnace wall, and the observation hole 20 is located in the middle of the front furnace wall 4 or the rear furnace wall 5.

[0070] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model's technical solution. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments without departing from the scope of the present utility model's technical solution, based on the technical essence of the present utility model and within the spirit and principles of the present utility model, shall still fall within the protection scope of the present utility model's technical solution.

Claims

1. A marine ammonia-diesel dual-fuel boiler, comprising, wherein the marine ammonia-diesel dual-fuel boiler includes a furnace body, furnace walls, water-cooled walls (2), and evaporator tube bundles (3), characterized in that, The furnace wall includes a front furnace wall (4) and a rear furnace wall (5). The front furnace wall (4), the rear furnace wall (5), the water-cooled wall (2), and the evaporation tube bundle (3) near the water-cooled wall (2) together form the furnace area (1), which is the combustion area. The marine ammonia-diesel dual-fuel boiler also includes an ammonia storage tank (6), a diesel storage tank (7), an ammonia burner (8), and a diesel burner (9). The ammonia storage tank (6) is connected to the ammonia burner (8) through a separate pipeline to send ammonia fuel into the furnace area (1) for combustion. The diesel storage tank (7) is connected to the diesel burner (9) through a separate pipeline to send diesel fuel into the furnace area (1) for combustion.

2. The marine ammonia-diesel dual-fuel boiler according to claim 1, characterized in that, The marine ammonia-diesel dual-fuel boiler also includes two outer shells (10) and two inner shells (11). Two outer shells (10) and two inner shells (11) together form two air jackets (12), and the two air jackets (12) are respectively arranged on the outside of the front furnace wall (4) and the rear furnace wall (5).

3. The marine ammonia-diesel dual-fuel boiler according to claim 2, characterized in that, The ammonia burner (8) and the diesel burner (9) are respectively installed on the outer shell of the two air jackets (12); The ammonia burner (8) directly feeds ammonia fuel and the air required for combustion into the furnace for combustion, while the diesel burner (9) feeds diesel fuel into the furnace. The air required for combustion first enters the air jacket (12) and then enters the furnace area (1) for combustion.

4. The marine ammonia-diesel dual-fuel boiler according to claim 3, characterized in that, One ammonia burner (8) and one diesel burner (9) or two ammonia burners (8) and two diesel burners (9) can be arranged on the front furnace wall (4) and the rear furnace wall (5). The two ammonia burners (8) can share one ammonia storage tank (6), and the two diesel burners (9) can share one diesel storage tank (7).

5. The marine ammonia-diesel dual-fuel boiler according to claim 1, characterized in that, The marine ammonia-diesel dual-fuel boiler is surrounded by an insulation layer (13). Among them, the insulation layer (13) of the front furnace wall (4) and the rear furnace wall (5) is pressed against the inner shell (11) by bolt assembly, and the insulation layer (13) at this location is pressed by the inner shell (11).

6. The marine ammonia-diesel dual-fuel boiler according to claim 1, characterized in that, The top of the evaporation tube bundle in the marine ammonia-diesel dual-fuel boiler is connected to the upper drum (14), the bottom of the evaporation tube bundle (3) is connected to the lower drum (15), and a downcomer (16) is connected between the upper drum (14) and the lower drum (15). The downcomer is located within two air gaps.

7. The marine ammonia-diesel dual-fuel boiler according to claim 1, characterized in that, The marine ammonia-diesel dual-fuel boiler also includes a flue (17). The flue gas generated by combustion in the furnace area washes over the surface of the evaporator tube bundle (3) and is discharged from the flue (17).

8. The marine ammonia-diesel dual-fuel boiler according to claim 1, characterized in that, The marine ammonia-diesel dual-fuel boiler also includes a platform ladder (18). The platform ladder (18) is located above the furnace area (1).

9. The marine ammonia-diesel dual-fuel boiler according to claim 1, characterized in that, The marine ammonia-diesel dual-fuel boiler also includes a manhole (19) and a fire observation hole (20). The manhole is located on the front furnace wall or the rear furnace wall, and the observation hole (20) is located in the middle of the front furnace wall (4) or the rear furnace wall (5).

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