Auxiliary steam boiler for vertical fuel ship

Abstract

The utility model relates to the technical field of boilers, in particular to an auxiliary steam boiler for a vertical fuel oil ship, which comprises a barrel, a hearth barrel is mounted on the lower portion inside the barrel, a burner is connected to one side of the hearth barrel, a plurality of smoke pipes are vertically arranged on the upper portion inside the barrel, the bottom ends of the smoke pipes are connected with the hearth barrel, and smoke outlets are arranged at the top ends of the smoke pipes. A needle-shaped heating surface pipe is installed in the smoke pipe, one side of the top of the needle-shaped heating surface pipe is communicated with the upper portion of the interior of the barrel through a steam discharging opening, and one side of the bottom of the needle-shaped heating surface pipe is communicated with the lower portion of the interior of the barrel through a water passing opening. According to the auxiliary steam boiler for the vertical fuel ship, the needle-shaped heating surface pipe is arranged in the smoke pipe, and the needle-shaped heating elements surrounding the outer wall of the needle-shaped heating surface pipe can improve the comprehensive heat transfer coefficient compared with a common light pipe. A heat exchange boundary layer is effectively thinned and heat resistance is reduced by strong turbulent flow formed by arrangement of the pin fins.

Description

Technical Field

[0001] This utility model relates to the field of boiler technology, specifically to a vertical oil-fired marine auxiliary steam boiler. Background Technology

[0002] In the field of marine boiler technology, marine boilers utilize fuel oil to exchange heat with water, thereby heating the water into steam for use on board. Due to the special nature of the marine environment, compared to land-based boilers, they have extremely strict limitations on size and weight, while also requiring efficient heat exchange capacity, reliable safety performance, and low maintenance costs.

[0003] For example, patent application number 201510821293.4 discloses a steam boiler that improves heat utilization efficiency to some extent by connecting a preheating box to the boiler body and incorporating insulation layers, springs, and other structures. However, this technology is primarily designed for ordinary steam boilers and does not consider the specific needs of marine applications. On the one hand, its structural design is not compact enough to meet the stringent size and weight restrictions imposed by ships; on the other hand, its heat exchange method is relatively traditional, lacking efficient heat exchange elements, and cannot quickly convert the heat generated by fuel combustion into steam, making it difficult to meet the demand for rapid steam supply during ship operation. Utility Model Content

[0004] The purpose of this utility model is to provide a vertical auxiliary steam boiler for oil-fired ships, in order to solve the problems mentioned in the background art, such as the structural design being not compact enough and unable to meet the stringent restrictions on equipment size and weight of ships; on the other hand, the heat exchange method is relatively traditional and lacks efficient heat exchange elements, making it difficult to quickly convert the heat generated by oil combustion into steam, and thus difficult to meet the needs of rapid steam supply during ship operation.

[0005] To achieve the above objectives, this utility model provides a vertical oil-fired marine auxiliary steam boiler, comprising a cylindrical body, a furnace cylinder installed at the lower interior of the cylindrical body, a burner connected to one side of the furnace cylinder, a plurality of flue pipes vertically arranged at the upper interior of the cylindrical body, the bottom end of the flue pipes connected to the furnace cylinder, a flue outlet provided at the top end of the flue pipes, and a needle-shaped heating surface tube installed inside the flue pipes. The top side of the needle-shaped heating surface tube is connected to the upper interior of the cylindrical body through a steam discharge port, and the bottom side of the needle-shaped heating surface tube is connected to the lower interior of the cylindrical body through a water inlet.

[0006] This design incorporates a furnace chamber at the bottom of the boiler shell as the combustion space for fuel oil. The burner supplies fuel oil to the furnace chamber and ignites it, generating high-temperature flue gas. This flue gas connects to a vertically installed flue pipe at the top of the boiler shell and rises to the exhaust port for discharge. Needle-shaped heating tubes are installed inside the flue pipes, connecting to the upper and lower parts of the boiler shell via steam outlets and water inlets, forming a circulation channel for the boiler water. The heat generated by fuel oil combustion is transferred to the boiler water through the flue pipes and needle-shaped heating tubes. The boiler water vaporizes within the needle-shaped heating tubes, and the steam enters the space above the boiler shell through the steam outlet. Unvaporized boiler water returns to the bottom of the boiler shell through the water inlet for further heating.

[0007] Preferably, the cylinder is connected to a water pump for water supply, a water level gauge is installed on one side of the upper part of the cylinder, and an inspection hole is provided on the other side of the upper part of the cylinder.

[0008] This feature includes an external water pump connected to the boiler body to supply water and ensure boiler water replenishment; a water level gauge monitors the water level inside the boiler body in real time and displays the water level status to provide feedback to operators or the control system; and inspection holes allow staff to directly observe the internal condition of the boiler body for maintenance, cleaning, or troubleshooting.

[0009] Preferably, the top of the cylinder is sequentially equipped with a lifting lug, a safety valve seat, a pressure gauge seat, and a main steam pipe seat, while the bottom of the cylinder is supported and fixed by a base.

[0010] The lifting lugs on the top of the boiler body are used for hoisting and transporting the boiler, facilitating installation and disassembly. The safety valve connector connects to a safety valve; when the internal pressure exceeds a set value, the safety valve automatically opens to release pressure, ensuring boiler safety. The pressure gauge connector connects to a pressure gauge, displaying the internal pressure in real time for operator monitoring. The main steam pipe connector serves as the steam output interface, delivering the generated steam to various steam-using equipment on the ship. The bottom of the boiler body is supported and secured by a base, ensuring stable placement.

[0011] Preferably, a cleaning port is provided on one side of the bottom of the cylinder, an insulation layer is installed on the outer wall of the cylinder, and a drain pipe seat is connected to the bottom of the cylinder.

[0012] This feature includes a cleaning port at the bottom of the boiler body for regular cleaning of dirt and impurities deposited at the bottom, preventing them from affecting the boiler's heat transfer efficiency and normal operation; an outer wall insulation layer reduces heat loss and energy waste, while also preventing accidental burns to operators; and a drain pipe seat connects to the drain pipe for convenient discharge of wastewater and impurities generated during boiler operation.

[0013] Preferably, an upper furnace tube sheet is installed on the upper part of the furnace cylinder, and a lower furnace tube sheet is installed on the lower part of the furnace cylinder.

[0014] This feature involves installing the upper and lower tube sheets of the furnace cylinder on the upper and lower parts of the furnace cylinder, respectively, and welding them with the straight furnace liner to form a closed furnace space. This provides a stable environment for fuel combustion and also serves as the structural foundation for connecting the flue pipes and other components.

[0015] Preferably, the inner wall of the furnace cylinder is equipped with a fire-resistant protective layer, and the bottom of the furnace cylinder is connected to the inner wall of the bottom of the cylinder by a number of bracing members.

[0016] The fire-resistant protective layer on the inner wall of the furnace cylinder is made of high-temperature and wear-resistant materials to prevent direct erosion of the furnace cylinder by high-temperature flames and flue gas; the bottom of the furnace cylinder and the inner wall of the bottom cylinder are connected to each other by bracing components to enhance the structural stability of the furnace cylinder under high temperature and high pressure environment and prevent deformation or damage.

[0017] Preferably, a fire observation tube is connected to one side of the outer wall of the furnace cylinder.

[0018] This feature includes a viewing tube on one side of the furnace cylinder that connects to the inside of the furnace. Operators can directly observe the combustion status of the fuel in the furnace through the viewing tube, including the flame color, shape, and whether the combustion is complete.

[0019] Preferably, the outer wall of the needle-shaped heating surface tube is provided with a needle-shaped heating element, which is arranged around the needle-shaped heating surface tube as the center on the surface of the needle-shaped heating surface tube.

[0020] The needle-shaped heating elements on the outer wall of the needle-shaped heating surface tube are arranged around the needle-shaped heating surface tube, which increases the contact area with high-temperature flue gas and boiler water and enhances the heat exchange effect. The special structure of the needle-shaped elements causes the flue gas to form turbulence on its surface, thins the heat exchange boundary layer, reduces thermal resistance, and improves the heat transfer coefficient.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] In this vertical oil-fired marine auxiliary steam boiler, the needle-shaped heat-receiving surface tubes installed inside the flue tubes, with needle-shaped heat-receiving elements surrounding the outer wall, can improve the overall heat transfer coefficient compared to ordinary smooth tubes. The strong turbulence formed by the arrangement of the needles effectively thins the heat transfer boundary layer, reduces thermal resistance, and greatly improves the exchange efficiency between the heat generated by oil combustion and the boiler water, resulting in faster steam generation and meeting the ship's demand for rapid steam supply.

[0023] With its vertical structure design, compact furnace and needle-shaped heat exchange tubes, the equipment significantly reduces its size and weight compared to traditional boilers while maintaining the same heat exchange capacity. This effectively meets the stringent size and weight requirements of ships and facilitates its rational arrangement within the limited space of a vessel.

[0024] The furnace shell is welded from the upper and lower tube sheets and the straight furnace liner, and the entire furnace is immersed in water, resulting in a large and uniform heating area and high thermal efficiency. Meanwhile, the refractory protective layer on the inner wall and the bottom bracing enhance the structural strength and stability of the furnace. The needle-shaped heating surface tubes have a self-cleaning capability, reducing dust adhesion and the frequency of cleaning and maintenance; this also reduces equipment replacement frequency and maintenance costs. Furthermore, components such as water level gauges, inspection holes, and safety valve seats on the shell facilitate real-time monitoring of the boiler's operating status, ensuring safe operation of the equipment. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the furnace cylinder in this utility model;

[0027] Figure 3 This is a schematic diagram of the structure of the flue pipe in this utility model;

[0028] The meanings of the labels in the diagram are as follows:

[0029] 1. Cylinder body; 11. Sludge removal port; 12. Insulation layer; 13. Inspection hole; 14. Water level gauge; 15. Lifting lug; 16. Safety valve seat; 17. Pressure gauge seat; 18. Main steam pipe seat; 2. Furnace cylinder body; 21. Upper tube sheet of furnace; 22. Lower tube sheet of furnace; 23. Refractory protective layer; 24. Bracing component; 25. Observation tube; 3. Smoke pipe; 4. Needle-shaped heating surface tube; 41. Steam exhaust port; 42. Water outlet; 5. Sludge drain seat; 6. Burner; 7. Base. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] This utility model provides a vertical oil-fired marine auxiliary steam boiler, such as... Figure 1 , Figure 3As shown, the furnace includes a cylinder 1, a furnace cylinder 2 installed at the bottom inside the cylinder 1, a burner 6 connected to one side of the furnace cylinder 2, several flue pipes 3 vertically arranged at the top inside the cylinder 1, the bottom end of the flue pipes 3 connected to the furnace cylinder 2, the top end of the flue pipes 3 having a flue outlet, and a needle-shaped heating surface tube 4 installed inside the flue pipes 3. The top side of the needle-shaped heating surface tube 4 is connected to the top inside the cylinder 1 through a steam discharge port 41, and the bottom side of the needle-shaped heating surface tube 4 is connected to the bottom inside the cylinder 1 through a water inlet 42.

[0032] A furnace chamber 2 is located at the lower part of the inner shell 1, serving as the combustion space for fuel oil. A burner 6 supplies fuel oil to the furnace chamber 2 and ignites it, generating high-temperature flue gas. The flue gas connects to several vertically arranged flue pipes 3 at the upper part of the inner shell 1 and rises to the exhaust port for discharge. Needle-shaped heating surface tubes 4 are installed inside the flue pipes 3. These tubes connect to the upper and lower parts of the inner shell 1 via steam exhaust ports 41 and water inlets 42, forming a circulation channel for the boiler water. The heat generated by fuel oil combustion is transferred to the boiler water through the flue pipes 3 and needle-shaped heating surface tubes 4. The boiler water is heated and vaporized within the needle-shaped heating surface tubes 4. The steam enters the space above the inner shell 1 through the steam exhaust port 41, while the unvaporized boiler water returns to the lower part of the inner shell 1 through the water inlet 42 for further heating. By combining the furnace chamber 2, flue pipes 3, and needle-shaped heating surface tubes 4, a highly efficient heat exchange system is formed. The needle-shaped heating element of the needle-shaped heating surface tube 4 increases the heating area, enhances heat transfer, and improves steam generation efficiency; the boiler water circulation channel design allows the boiler water to fully absorb heat, ensuring a continuous and stable supply of steam to meet the steam demand of ships.

[0033] In this embodiment, as Figure 1 As shown, the cylinder 1 is connected to an external water pump for water supply. A water level gauge 14 is installed on one side of the upper part of the cylinder 1, and an inspection hole 13 is provided on the other side of the upper part of the cylinder 1.

[0034] The cylinder 1 is connected to an external water pump for water supply to ensure the replenishment of boiler water; the water level gauge 14 installed on the upper side of the cylinder 1 monitors the water level inside the cylinder 1 in real time and provides feedback to the operator or control system by displaying the water level status; the inspection hole 13 set on the other upper side of the cylinder 1 allows the staff to directly observe the internal condition of the cylinder 1 for maintenance, cleaning or troubleshooting.

[0035] An external water pump enables automatic or semi-automatic water replenishment to ensure the water level required for normal boiler operation; the water level gauge 14 provides data support for water level control to prevent safety issues caused by excessively high or low water levels; the inspection hole 13 facilitates maintenance personnel to inspect and maintain the boiler's interior, promptly identify and resolve problems, and extend the boiler's service life.

[0036] Specifically, such as Figure 1As shown, the top of the cylinder 1 is sequentially equipped with a lifting lug 15, a safety valve seat 16, a pressure gauge seat 17, and a main steam pipe seat 18, and the bottom of the cylinder 1 is supported and fixed by a base 7.

[0037] The lifting lugs 15 installed sequentially on the top of the boiler body 1 are used for lifting and transporting the boiler, facilitating installation and disassembly. The safety valve seat 16 connects to the safety valve; when the internal pressure of the boiler body 1 exceeds a set value, the safety valve automatically opens to release pressure, ensuring boiler safety. The pressure gauge seat 17 connects to a pressure gauge, displaying the internal pressure of the boiler body 1 in real time for easy monitoring by operators. The main steam pipe seat 18 serves as the steam output interface, delivering the generated steam to various steam-using equipment on the ship. The bottom of the boiler body 1 is supported and fixed by the base 7, ensuring stable placement of the boiler. The lifting lugs 15 improve the convenience of boiler installation and transportation; the safety valve seat 16 and pressure gauge seat 17 work together to ensure safe boiler operation and prevent accidents caused by abnormal pressure; the main steam pipe seat 18 achieves stable steam output; and the base 7 ensures the boiler remains stable during ship operation, preventing swaying from affecting operational safety and efficiency.

[0038] Furthermore, such as Figure 1 As shown, a cleaning port 11 is provided on one side of the bottom of the cylinder 1, an insulation layer 12 is installed on the outer wall of the cylinder 1, and a drain pipe seat 5 is connected to the bottom of the cylinder 1.

[0039] A cleaning port 11 located on one side of the bottom of the boiler body 1 is used to periodically clean the dirt and impurities deposited at the bottom, preventing them from affecting the boiler's heat transfer efficiency and normal operation. An insulation layer 12 installed on the outer wall of the boiler body 1 reduces heat loss and energy waste, while also preventing accidental burns to operators. A drain pipe seat 5 connected to the bottom of the boiler body 1 connects to a drain pipe, facilitating the discharge of wastewater and impurities generated during boiler operation. The design of the cleaning port 11 and the drain pipe seat 5 facilitates boiler cleaning and maintenance, ensures internal boiler cleanliness, and improves heat exchange efficiency. The insulation layer 12 effectively reduces heat loss, improves energy utilization, and enhances operational safety.

[0040] Furthermore, such as Figure 2 As shown, an upper furnace tube sheet 21 is installed on the upper part of the furnace cylinder 2, and a lower furnace tube sheet 22 is installed on the lower part of the furnace cylinder 2.

[0041] The upper tube sheet 21 installed on the upper part of the furnace shell 2 and the lower tube sheet 22 installed on the lower part of the furnace shell 2 are welded to the straight furnace liner to form a closed furnace space, providing a stable place for fuel combustion, and also serving as the structural foundation for connecting the flue pipe 3 and other components. The furnace structure formed by the upper tube sheet 21, the lower tube sheet 22 and the straight furnace liner has high strength and can withstand high temperature and high pressure, ensuring complete combustion of fuel; the regular furnace space is conducive to uniform flow of flue gas, improving the stability and efficiency of heat exchange.

[0042] Furthermore, such as Figure 2 As shown, the inner wall of the furnace cylinder 2 is equipped with a fire-resistant protective layer 23, and the bottom of the furnace cylinder 2 is connected to the bottom inner wall of the cylinder 1 by several bracing members 24.

[0043] The refractory protective layer 23 installed on the inner wall of the furnace cylinder 2 is made of high-temperature and wear-resistant materials to prevent direct erosion of the furnace cylinder 2 by high-temperature flames and flue gas. The bottom of the furnace cylinder 2 is connected to the bottom inner wall of the cylinder 1 by several bracing members 24, which enhances the structural stability of the furnace cylinder 2 under high temperature and high pressure environments and prevents deformation or damage. The refractory protective layer 23 extends the service life of the furnace cylinder 2 and reduces maintenance and replacement costs; the bracing members 24 ensure the structural stability of the furnace cylinder 2, guarantee the safe operation of the boiler, and avoid safety accidents caused by structural instability.

[0044] Furthermore, such as Figure 2 As shown, a fire observation tube 25 is connected to one side of the outer wall of the furnace cylinder 2.

[0045] A viewing tube 25 connected to one side of the outer wall of the furnace cylinder 2 leads into the furnace interior. Operators can directly observe the combustion status of the fuel oil in the furnace through the viewing tube 25, including the flame color, shape, and whether combustion is complete. This allows operators to monitor the combustion status in real time, adjust the burner 6 parameters in a timely manner, ensure complete combustion of fuel oil, improve combustion efficiency, and reduce fuel waste and pollutant emissions. At the same time, observing the flame status can provide a preliminary assessment of whether there is a boiler malfunction, facilitating timely maintenance.

[0046] Furthermore, such as Figure 3 As shown, the outer wall of the needle-shaped heating surface tube 4 is provided with a needle-shaped heating element, which is arranged around the needle-shaped heating surface tube 4 on the surface of the needle-shaped heating surface tube 4.

[0047] The outer wall of the needle-shaped heating surface tube 4 is provided with needle-shaped heating elements. The needle-shaped heating elements are arranged around the needle-shaped heating surface tube 4 to increase the contact area with high-temperature flue gas and boiler water, thereby enhancing the heat exchange effect. The special structure of the needle-shaped elements causes the flue gas to form turbulence on its surface, thinning the heat exchange boundary layer, reducing thermal resistance, and improving the heat transfer coefficient.

[0048] The heat exchange efficiency of the needle-shaped heating surface tube 4 is significantly improved, enabling the boiler water to absorb heat and vaporize more quickly, thereby increasing the steam generation rate and output. The compact needle-shaped heating element greatly increases the heat exchange area within a limited space, meeting the dual requirements of marine boilers for efficient heat exchange and compact design.

[0049] In operation, the vertical oil-fired marine auxiliary steam boiler of this invention first uses an external water pump to deliver water to the furnace shell 1. Once the predetermined water level is reached, the burner 6 starts, supplying and igniting fuel oil into the furnace shell 2. The fuel oil burns completely within the enclosed furnace space formed by the upper tube sheet 21, the lower tube sheet 22, and the straight furnace chamber, producing high-temperature flue gas. During this process, the operator can observe the flame status within the furnace through the observation tube 25. If incomplete combustion or other abnormalities are detected, the burner 6 parameters are adjusted promptly to ensure efficient fuel oil combustion and reduce pollutant emissions.

[0050] High-temperature flue gas rises from the furnace shell 2, enters the flue pipe 3 through its bottom end, and flows towards the exhaust port. Needle-shaped heating surface tubes 4 are installed inside the flue pipe 3, and the needle-shaped heating elements surrounding their outer walls greatly increase the contact area with the high-temperature flue gas. Simultaneously, the special structure of the needle-shaped elements causes turbulence on the surface of the flue gas, thinning the heat transfer boundary layer and enhancing heat transfer. Boiler water enters the tube through the water outlet 42 at the bottom of the needle-shaped heating surface tube 4, absorbs the heat transferred from the high-temperature flue gas through the tube, and then vaporizes. The generated steam enters the upper space inside the furnace shell 1 through the steam exhaust port 41. The partially vaporized boiler water flows back to the bottom of the furnace shell 1 through the water outlet 42 to continue participating in the circulating heating, ensuring a continuous and stable steam production.

[0051] As steam accumulates in the upper part of the cylinder 1, it reaches a certain pressure and temperature, and is then transported to various steam-using equipment on the ship through the main steam pipe seat 18 to meet the various steam usage needs of the ship during operation, such as heating and power assistance.

[0052] The water level gauge 14 monitors the water level inside the boiler body 1 in real time and feeds the data back to the operator or control system. When the water level is lower than the set value, the external water pump automatically starts to replenish water; when the water level is too high, excess boiler water can be discharged through the drain pipe seat 5 to ensure water level stability. The pressure gauge connected to the pressure gauge seat 17 displays the internal pressure of the boiler body 1 in real time. When the pressure exceeds the set value of the safety valve connected to the safety valve seat 16, the safety valve automatically opens to release pressure, ensuring the safe operation of the boiler.

[0053] During operation, dirt and impurities deposited at the bottom of the cylinder 1 can be cleaned periodically through the cleaning port 11; wastewater and impurities generated during boiler operation are discharged through the drain pipe seat 5. At the same time, the insulation layer 12 on the outer wall of the cylinder 1 effectively reduces heat loss, lowers energy consumption, and also prevents operators from being accidentally burned; the refractory protective layer 23 on the inner wall of the furnace cylinder 2 and the bracing member 24 between the bottom and the cylinder 1 protect the furnace structure, enhance its stability under high temperature and high pressure environments, and extend the service life of the boiler.

[0054] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A vertical oil-fired marine auxiliary steam boiler, comprising a cylindrical body (1), characterized in that: A furnace cylinder (2) is installed at the bottom inside the cylinder (1). A burner (6) is connected to one side of the furnace cylinder (2). Several flue pipes (3) are vertically arranged at the top inside the cylinder (1). The bottom end of the flue pipe (3) is connected to the furnace cylinder (2). A flue outlet is provided at the top of the flue pipe (3). A needle-shaped heating surface tube (4) is installed inside the flue pipe (3). The top side of the needle-shaped heating surface tube (4) is connected to the top inside of the cylinder (1) through a steam discharge port (41). The bottom side of the needle-shaped heating surface tube (4) is connected to the bottom inside of the cylinder (1) through a water inlet (42).

2. The vertical oil-fired marine auxiliary steam boiler according to claim 1, characterized in that: The cylinder (1) is connected to an external water pump for water supply. A water level gauge (14) is installed on one side of the upper part of the cylinder (1), and an inspection hole (13) is provided on the other side of the upper part of the cylinder (1).

3. The vertical oil-fired marine auxiliary steam boiler according to claim 1, characterized in that: The top of the cylinder (1) is sequentially equipped with a lifting lug (15), a safety valve seat (16), a pressure gauge seat (17), and a main steam pipe seat (18), and the bottom of the cylinder (1) is supported and fixed by a base (7).

4. The vertical oil-fired marine auxiliary steam boiler according to claim 1, characterized in that: A cleaning port (11) is provided on one side of the bottom of the cylinder (1), an insulation layer (12) is installed on the outer wall of the cylinder (1), and a drain pipe seat (5) is connected to the bottom of the cylinder (1).

5. The vertical oil-fired marine auxiliary steam boiler according to claim 1, characterized in that: The upper part of the furnace cylinder (2) is equipped with an upper furnace tube sheet (21), and the lower part of the furnace cylinder (2) is equipped with a lower furnace tube sheet (22).

6. The vertical oil-fired marine auxiliary steam boiler according to claim 5, characterized in that: The inner wall of the furnace cylinder (2) is equipped with a fire-resistant protective layer (23), and the bottom of the furnace cylinder (2) is connected to the bottom inner wall of the cylinder (1) by a number of bracing members (24).

7. The vertical oil-fired marine auxiliary steam boiler according to claim 5, characterized in that: A fire observation tube (25) is connected to one side of the outer wall of the furnace cylinder (2).

8. The vertical oil-fired marine auxiliary steam boiler according to claim 1, characterized in that: The outer wall of the needle-shaped heating surface tube (4) is provided with a needle-shaped heating element, which is arranged around the needle-shaped heating surface tube (4) as the center and on the surface of the needle-shaped heating surface tube (4).

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