Marine methanol fuel supply system

Abstract

The invention relates to a marine methanol fuel supply system which comprises a methanol storage cabin, a heat exchanger, a methanol temporary storage cabin and a methanol isolation cabin, the system further comprises a methanol purging cabin, a three-way valve and a methanol pump; two inlet ends of the three-way valve are respectively connected to the methanol purging cabin and the methanol storage cabin through pipelines; one end of the methanol pump is connected with an outlet of the three-way valve, the other end of the methanol pump is connected with the heat exchanger, and methanol fuel is lighted to the heat exchanger from the methanol storage cabin and the methanol purging cabin; the main machine is provided with a methanol purging pipeline which is used for purging methanol fuel in a pipeline system to the methanol purging cabin after the methanol fuel supply system stops running; and the methanol purging cabin is not provided with an additional discharge channel. The complexity and the construction cost of the methanol fuel supply system are reduced, meanwhile, crew does not need to separate oil dirt in methanol fuel, the workload of the crew is reduced, and the safety of a ship is improved.

Description

Technical Field

[0001] The invention relates to a marine methanol fuel supply system, belonging to the technical field of marine methanol systems. Background Art

[0002] In the existing methanol fuel supply system, the methanol delivery pump transfers the methanol fuel to the methanol temporary storage tank, and the methanol supply pump draws the methanol fuel from the methanol temporary storage tank, and then passes through the heat exchanger and the methanol circulation pump to adjust the pressure and temperature of the methanol fuel to the parameters required by the main engine, and then supplies it to the main engine through the fuel valve group. The methanol fuel supply system of the prior art is equipped with a methanol temporary storage tank with a large tank capacity and a methanol delivery pump with a large displacement. The system is relatively complex and difficult to arrange on board. Summary of the invention

[0003] The purpose of the present invention is to provide a methanol fuel supply system for a ship, which eliminates the methanol temporary storage tank, methanol delivery pump, methanol separation tank, and methanol separation tank discharge pipeline of the methanol fuel supply system in the prior art, and realizes the supply function of methanol fuel by setting a methanol purge tank and a three-way valve. The methanol fuel supply system of the present invention reduces the complexity and construction cost of the methanol fuel supply system, and at the same time does not require the crew to separate the oil pollution in the methanol fuel, thereby reducing the workload of the crew and increasing the safety of the ship.

[0004] The present invention adopts the following technical solutions:

[0005] A marine methanol fuel supply system comprises a methanol storage tank 1 and a heat exchanger 7, but does not include a methanol temporary storage tank 2 and a methanol isolation tank 3; further comprises a methanol purge tank 4, a three-way valve 20, and a methanol pump 22; the two inlet ends of the three-way valve 20 are respectively connected to the methanol purge tank 4 and the methanol storage tank 1 through pipelines; one end of the methanol pump 22 is connected to the outlet of the three-way valve 20, and the other end is connected to the heat exchanger 7, so as to transfer methanol from the methanol storage tank 1 and the methanol purge tank 4 to the heat exchanger 7; a main engine 10 is provided with a methanol purge pipeline 12, which is used to purge the methanol fuel in the pipeline system to the methanol purge tank 4 after the methanol fuel supply system stops running; and the methanol purge tank 4 is not provided with an additional discharge channel.

[0006] Preferably, the heat exchanger 7 heats or cools the methanol fuel from the methanol pump 22 and allows the methanol fuel to enter the methanol pump 28 for secondary pressurization. The methanol fuel after secondary pressurization enters the main engine through the fuel valve group 9 and the methanol supply pipe 11 for combustion by the main engine. A reflux pipe 14 and a pressure regulating valve 13 are provided at the outlet of the methanol pump 28, and the pressure regulating valve 13 is used to adjust the pressure of the methanol fuel entering the fuel valve group 9.

[0007] Preferably, the openings of the two inlet ends of the three-way valve 20 are adjustable. By adjusting the openings of the two inlet ends of the three-way valve 20, the ratio of methanol fuel in the methanol storage tank 1 and the methanol purge tank 4 provided to the methanol pump 22 is allocated, thereby controlling the ratio of methanol fuel containing oil pollution from the methanol purge tank 4 sent to the main engine through the methanol pump 22.

[0008] Preferably, no methanol delivery pump 5 is provided in the methanol storage tank 1 .

[0009] The beneficial effects of the present invention are:

[0010] 1) No methanol delivery pump is required, which reduces the procurement cost of methanol fuel system equipment and the failure rate of ship operation, and simplifies the crew's work;

[0011] 2) No methanol temporary storage tank is set up, which reduces the cost of ship construction and the difficulty of arranging methanol tanks and auxiliary equipment during ship design;

[0012] 3) There is no need to set up a methanol separation cabin and a methanol separation cabin discharge system. In the prior art, the methanol fuel containing oil in the main engine is purged into the methanol separation cabin after the main engine is shut down. The oil is incompatible with methanol in the methanol separation cabin, and the density is greater than that of the methanol fuel, so the oil is deposited at the bottom of the methanol separation cabin. The crew regularly discharges the oil to other containers through the methanol separation cabin discharge pipeline and valve. Since methanol fuel is a low flash point and toxic fuel, the crew is prone to leakage of methanol in the methanol separation cabin during the process of discharging the oil in the methanol separation cabin, which may cause poisoning of the crew and cause fire or even explosion. The present invention avoids the crew's operation of discharging oil by setting up a methanol purge cabin and a three-way valve, thereby increasing the safety of the ship. In addition, the methanol purge cabin has a small volume, and the impact on the layout and construction of the ship can be ignored. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of the structure of a methanol fuel supply system in the prior art.

[0014] Figure 2 It is a structural schematic diagram of the methanol fuel supply system of the present invention.

[0015] The following figure is attached Figure 1 and Figure 2The equipment and accessory numbers inside are as follows: 1-methanol storage tank; 2-methanol temporary storage tank; 3-methanol separation tank; 4-methanol purge tank; 5-methanol delivery pump; 6-methanol pump one; 7-heat exchanger; 8-methanol pump two; 9-methanol fuel valve group; 10-main engine; 11-methanol supply pipe; 12-methanol purge pipe; 13-pressure regulating valve; 14-methanol reflux pipe; 15-methanol suction pipe one; 16-methanol delivery pipe; 17-methanol suction pipe two; 18-methanol suction pipe three; 19-methanol suction pipe four; 20-three-way valve; 21-methanol separation tank discharge valve; 22-methanol pump three;. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0017] Embodiment 1 (comparative embodiment, prior art)

[0018] The principle of methanol fuel supply system in the prior art is as follows Figure 1 As shown. The methanol delivery pump 5 transfers the methanol fuel from the methanol storage tank 1 to the methanol temporary storage tank 2 through the methanol delivery pipe 16. The methanol fuel in the methanol temporary storage tank 2 enters the methanol pump 6 through the methanol suction pipe 15. The methanol pump 6 pressurizes the methanol fuel and delivers it to the heat exchanger 7. The methanol fuel heated or cooled by the heat exchanger 7 enters the methanol pump 2 8 for secondary pressurization. The methanol fuel after secondary pressurization enters the main engine through the fuel valve group 9 and the methanol supply pipe 11 for main engine combustion. The outlet of the methanol pump 2 8 is provided with a reflux pipe 14 and a pressure regulating valve 13 to control the pressure of the methanol fuel entering the fuel valve group 9. The main engine 10 is provided with a methanol purge pipeline 12, which is used to purge the methanol fuel in the pipeline system to the methanol separation cabin 3 after the methanol fuel supply system stops running; the methanol separation cabin 3 is provided with a methanol separation cabin discharge valve 21, which is used to separate the oil contained in the methanol separation cabin 3 when the methanol fuel from the main engine is purged; the top of the methanol separation cabin 3 is connected to the methanol temporary storage cabin 2, and the methanol fuel in the separation cabin can enter the methanol temporary storage cabin 2 from the top.

[0019] The disadvantage of the prior art is that the methanol fuel supply system is relatively complicated, especially the system contains a methanol temporary storage tank 2, a methanol delivery pump 5, and a methanol delivery pipe 16, which makes it difficult to arrange on board and increases the cost of ship construction. The system operation is more complicated, the reliability is reduced, and the crew's inspection work on equipment is increased.

[0020] In view of the shortcomings of the existing technology, the purpose of the present invention is to simplify the methanol fuel supply system while ensuring the reliable supply of methanol fuel to the main engine. In addition, in order to separate the oil in the methanol purged by the main engine, a methanol separation tank discharge valve 21 is provided, and the crew is required to discharge the oil in the methanol separation tank 3 regularly. Since methanol is a low flash point and toxic fuel, it is a dangerous task for the crew to regularly discharge the oil in the methanol separation tank 3, which is easy to cause poisoning of the crew and leakage of methanol fuel, and even cause fire and explosion accidents.

[0021] Embodiment 2 (preferred embodiment):

[0022] The methanol fuel supply system of this embodiment is as follows Figure 2 As shown, the methanol pump 22 transfers the methanol fuel from the methanol storage tank 1 and the methanol purge tank 4 to the heat exchanger 7 through the methanol delivery pipes 18, 19 and 17. The system is provided with a three-way valve 20, and the two inlet ends of the three-way valve 20 are connected to the methanol purge tank 4 and the methanol storage tank 1 through pipelines 19 and 18 respectively. The heat exchanger 7 heats or cools the methanol fuel from the methanol pump 22 into the methanol pump 28 for secondary pressurization, and the methanol fuel after secondary pressurization enters the main engine through the fuel valve group 9 and the methanol supply pipe 11 for main engine combustion. The outlet of the methanol pump 28 is provided with a reflux pipe 14 and a pressure regulating valve 13, and the pressure regulating valve 13 is used to adjust the pressure of the methanol fuel entering the fuel valve group 9. The main engine 10 is provided with a methanol purge pipeline 12, which is used to purge the methanol fuel in the pipeline system to the methanol purge tank 4 after the methanol fuel supply system stops running; the setting of the methanol purge tank 4 prevents the methanol fuel containing oil pollution in the main engine from being purged into the methanol storage tank 1, thereby contaminating the methanol fuel in the methanol storage tank 1.

[0023] By adjusting the opening of the two inlet ends of the three-way valve 20, the proportion of methanol fuel in the methanol storage tank 1 or the methanol purge tank 4 provided to the methanol pump 22 can be effectively allocated, thereby controlling the proportion of methanol fuel containing oil stains from the methanol purge tank 4 delivered to the main engine through the methanol pump 22. Because the calorific value of methanol and the oil stains mixed into the methanol fuel are quite different, and the viscosity difference is also very large, the above control method can avoid the sudden change of the calorific value of the fuel provided to the main engine when a large amount of methanol fuel containing oil stains enters the main engine, which has a significant impact on the operation of the main engine. At the same time, if a large amount of oil stains are mixed in the methanol fuel, since the heating design and temperature control of the heater 7 are designed according to the methanol fuel, the oil stains in the methanol fuel cannot be heated to the supply temperature and viscosity required by the main engine for the fuel oil, resulting in serious consequences such as the supply pipeline being blocked by the oil stains when the methanol containing oil stains is supplied, and the main engine fuel injection nozzle being blocked.

[0024] Key points of this embodiment:

[0025] 1) A methanol purge tank 4 is provided for receiving methanol fuel containing oil pollution purged from the main engine;

[0026] 2) A three-way valve 20 is provided, and the two inlet ends of the three-way valve are respectively connected to the methanol storage tank 1 and the methanol purge tank 4. The three-way valve can adjust the flow distribution of the two inlet ends, thereby controlling the amount of methanol fuel containing oil pollution entering the main engine from the methanol purge tank 4;

[0027] 3) A methanol suction pipe 19 is provided to input the methanol fuel containing oil pollution from the methanol purge tank 4 into the inlet end of the three-way valve 20;

[0028] 4) A methanol pump 22 is provided, and the methanol pump 22 delivers the methanol fuel from the three-way valve 20 to the heat exchanger 7;

[0029] The present invention does not provide a methanol delivery pump, which reduces the equipment procurement cost of the methanol fuel system and the failure rate of ship operation, and simplifies the crew's work; does not provide a methanol daily tank, which reduces the ship construction cost and the difficulty of arranging the methanol tank and auxiliary equipment during ship design; and does not need to provide a methanol separation tank and a methanol separation tank discharge system. In the prior art, the methanol fuel containing oil pollution in the main engine is purged into the methanol separation tank after the main engine is shut down. The oil pollution and methanol in the methanol separation tank are incompatible, and the density is greater than that of the methanol fuel, so the oil pollution is deposited at the bottom of the methanol separation tank. The crew regularly discharges the oil pollution into other containers through the methanol separation tank discharge pipeline and valve. Since methanol fuel is a low flash point and toxic fuel, the crew is prone to leakage of methanol in the methanol separation tank during the process of discharging the oil pollution in the methanol separation tank, thereby causing poisoning of the crew and causing fire or even explosion. The present invention avoids the crew's operation of discharging oil pollution by providing a methanol purge tank and a three-way valve, thereby increasing the safety of the ship. In addition, the methanol purge tank has a small volume, and the impact on the layout and construction of the ship can be ignored.

[0030] The methanol fuel supply system of the present invention simplifies the equipment and configuration of the existing methanol fuel supply system, making the methanol fuel supply system more economical, reliable and safe.

[0031] The above are preferred embodiments of the present invention. A person skilled in the art may make various changes or improvements on this basis. Without departing from the general concept of the present invention, these changes or improvements should be included in the scope of protection required by the present invention.

Claims

1. A methanol fuel supply system for a ship, comprising a methanol storage tank (1) and a heat exchanger (7), characterized in that: No methanol temporary storage tank (2) and no methanol isolation tank (3) are provided; It also includes a methanol purge chamber (4), a three-way valve (20), and a methanol pump (22); The two inlet ends of the three-way valve (20) are respectively connected to the methanol purge tank (4) and the methanol storage tank (1) through pipelines; one end of the methanol pump (22) is connected to the outlet of the three-way valve (20), and the other end is connected to the heat exchanger (7), so as to transfer methanol fuel from the methanol storage tank (1) and the methanol purge tank (4) to the heat exchanger (7); The main engine (10) is provided with a methanol purge pipeline (12) for purging the methanol fuel in the pipeline system into the methanol purge chamber (4) after the methanol fuel supply system stops operating; The methanol purge chamber (4) is not provided with an additional discharge channel.

2. The marine methanol fuel supply system according to claim 1, characterized in that: The heat exchanger (7) heats or cools the methanol fuel from the methanol pump (22) and enters the methanol pump 2 (8) for secondary pressurization. The secondary pressurized methanol fuel passes through the fuel valve group (9) and the methanol supply pipe (11) and enters the main engine for combustion. The outlet of the second methanol pump (8) is provided with a reflux pipe (14) and a pressure regulating valve (13), and the pressure regulating valve (13) is used to regulate the pressure of the methanol fuel entering the fuel valve group (9).

3. The marine methanol fuel supply system according to claim 1, characterized in that: The openings of the two inlet ends of the three-way valve (20) are adjustable. By adjusting the openings of the two inlet ends of the three-way valve (20), the ratio of the methanol fuel in the methanol storage tank (1) and the methanol purge tank (4) provided to the methanol pump (22) is allocated, thereby controlling the ratio of the methanol fuel containing oil pollution from the methanol purge tank (4) to be delivered to the main engine through the methanol pump (22).

4. The marine methanol fuel supply system according to claim 1, characterized in that: No methanol delivery pump (5) is provided in the methanol storage tank (1).

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