A pure methanol fuel extended-range hybrid power system for ships

Abstract

The present invention discloses a pure methanol fuel extended-range hybrid system for ships, including a methanol tank, an extended-range methanol engine, a new energy power generation system, a generator, a battery pack, a charging control module, a discharge control module and a drive motor. The methanol tank is connected to the extended-range methanol engine, the new energy power generation system is connected to the battery pack, the battery pack is connected to the drive motor, the generator is connected to the drive motor, the charging control module can control the connection and interruption of the extended-range methanol engine and the drive motor, and the discharge control module can control the connection and interruption of the battery pack and the drive motor. This technical solution uses pure green methanol as fuel, the whole system has a simple structure, is easy to install, can improve the endurance of ships, and compared with diesel ships, can greatly reduce the pollution caused by diesel ships' emissions and noise to the ocean, and has a lower cost of use. At the same time, it can reduce the risk of thermal runaway caused by the heating of the battery pack when the battery pack is fast charged.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a pure methanol fuel range-extended hybrid power system for ships. Background Art

[0002] In recent years, the new energy vehicle industry has developed rapidly, injecting strong momentum into the green and low-carbonization of transportation vehicles. Currently, new energy is mainly used in the automotive industry, and its application in the shipping industry is limited.

[0003] Traditional ships mainly rely on fuel oil and liquefied natural gas as power, and are currently turning to the use of cleaner fuel energy, green methanol. However, the calorific value of methanol is lower than that of gasoline and diesel, and its economy and ship range restrict its development.

[0004] At present, ship power drive systems mainly include the following categories:

[0005] 1. Ship propulsion systems using fuel oil, liquefied natural gas, and methanol as fuel.

[0006] 2. A ship's power system that is driven purely by electricity.

[0007] 3. A hybrid ship drive system consisting of fuel and batteries.

[0008] The main disadvantages of these technologies are:

[0009] 1. Fuel-fired ships have diesel engines that are expensive, noisy, emit polluting gases, are large and heavy, and have high operating costs.

[0010] 2. Pure electric ships are difficult to charge and have short cruising range, so they often reduce economic efficiency and safety performance to increase battery capacity and extend their cruising range.

[0011] 3. Hybrid ships are powered by a combination of diesel and batteries. Although fuel consumption and emissions are reduced, their initial investment costs increase and the diesel pollution emission problem still exists.

[0012] 4. Pure methanol-powered ships have a lower calorific value than diesel, require more space to store methanol fuel, and have a lower cruising range than diesel ships. Summary of the invention

[0013] In view of the defects in the prior art, the present invention provides a pure methanol fuel extended-range hybrid power system for ships. The technical solution adopts pure methanol as fuel. The whole system has a simple structure and is easy to install. It can improve the ship's endurance. Compared with diesel ships, it can greatly reduce the pollution to the ocean caused by diesel ships' emissions and noise, and has a lower cost of use. At the same time, it can reduce the risk of thermal runaway caused by the heating of the battery pack when the battery pack is fast charged.

[0014] A pure methanol fuel extended-range hybrid system for ships, comprising a methanol fuel tank, an extended-range methanol engine, a new energy power generation system, a generator, a battery pack, a charging control module, a discharging control module and a drive motor.

[0015] The methanol fuel tank is connected to the extended-range methanol engine, the extended-range methanol engine is connected to the generator, and the generator is connected to the battery pack.

[0016] The new energy power generation system is connected to the battery pack.

[0017] The battery pack is connected to the drive motor.

[0018] The generator is connected to the driving motor.

[0019] The charging control module can detect the power of the battery pack and control the start of the extended-range methanol engine. The charging control module can control the connection and interruption between the extended-range methanol engine and the drive motor.

[0020] The discharge control module can control the connection and disconnection between the battery pack and the drive motor.

[0021] Preferably, the extended-range methanol engine comprises an automotive-grade gasoline engine, a methanol rail injection module, an air heating module, a high-frequency vibration module and a micro-reaction methanol reforming hydrogen production module;

[0022] The methanol injection rail module is located outside the throttle intake pipe of the automotive-grade gasoline engine. The outlet of the methanol injection rail module is connected to the air heating module, and the air heating module is used to increase the temperature of the methanol liquid and vaporize it.

[0023] The air heating module is connected to a high-frequency vibration module, and the high-frequency vibration module causes the vaporized methanol molecules to continuously resonate.

[0024] The micro-reaction methanol reforming hydrogen production module is used to produce hydrogen and oxygen, and assists the methanol rail injection module, the air heating module and the high-frequency vibration module to ignite the methanol fuel at ultra-low temperatures.

[0025] Preferably, the new energy power generation system includes a solar power generation system and a breeze power generation system.

[0026] Preferably, it also includes an accelerator pedal detection sensor, which can detect the pedaling amplitude of the accelerator pedal and send the information to the charging control module and the discharging control module.

[0027] Preferably, the accelerator pedal detection sensor is a potential sensor.

[0028] Preferably, the methanol tank is a 30L tank.

[0029] Preferably, the battery pack is a sodium ion battery pack.

[0030] The beneficial effects of the present invention are as follows: In this technical solution, the new energy power generation system and the generator are used together to make full use of the new energy. At the same time, when the new energy power supply is insufficient, methanol is used to generate electricity, so that the ship can continue to sail normally. In this way, the fuel consumption is reduced and the cost is reduced while ensuring the normal movement of the ship. And when the battery pack is fast charged, the risk of thermal runaway caused by the heating of the battery pack caused by fast charging can be reduced.

[0031] This technical solution uses pure methanol as fuel through the coordination of various components. The thermal efficiency of the extended-range methanol engine is improved, which can ensure the ship's endurance, eliminate emissions pollution, reduce noise, and make the equipment operating costs low.

[0032] In this technical solution, an accelerator pedal detection sensor is provided so that the system has two working modes when working. When the battery power is less than 30% and the accelerator pedal is stepped on at 70%, the battery pack and the generator simultaneously supply power to the drive motor, which can obtain maximum thrust and improve the power of the ship when the battery power is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0034] Figure 1 It is a principle block diagram of the present invention;

[0035] Figure 2 This is a schematic diagram of the structure of the present invention installed on a ship;

[0036] Figure 3 It is a principle block diagram of the extended-range methanol engine in the present invention.

[0037] In the attached figure, 1-methanol fuel tank, 2-extended-range methanol engine, 3-solar power generation system, 4-breeze power generation system, 5-generator, 6-battery pack, 7-charging control module, 8-discharging control module, 9-drive motor, 10-accelerator pedal. DETAILED DESCRIPTION

[0038] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0039] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the invention belongs.

[0040] Example 1

[0041] like Figure 1-Figure 3 As shown, in this embodiment, a pure methanol fuel extended-range hybrid system for ships is provided, including a methanol fuel tank 1, an extended-range methanol engine 2, a new energy power generation system, a generator 5, a battery pack 6, a charging control module 7, a discharging control module 8 and a driving motor 9.

[0042] The methanol fuel tank 1 is connected to the extended-range methanol engine 2, the extended-range methanol engine 2 is connected to the generator 5, and the generator 5 is connected to the battery pack 6.

[0043] The new energy power generation system is connected to the battery pack 6.

[0044] The battery pack 6 is connected to the drive motor 9.

[0045] The generator 5 is connected to the drive motor 9.

[0046] The charging control module 7 can detect the power of the battery pack 6 and control the start of the extended-range methanol engine 2. The charging control module 7 can control the connection and interruption between the extended-range methanol engine 2 and the drive motor 9.

[0047] The discharge control module 8 can control the connection and disconnection between the battery pack 6 and the drive motor 9 .

[0048] The extended-range methanol engine 2 in this embodiment includes an automotive-grade gasoline engine, a methanol rail injection module, an air heating module, a high-frequency vibration module, and a micro-reaction methanol reforming hydrogen production module;

[0049] The methanol injection rail module is located outside the throttle intake pipe of the automotive-grade gasoline engine. The outlet of the methanol injection rail module is connected to the air heating module, and the air heating module is used to increase the temperature of the methanol liquid and vaporize it.

[0050] The air heating module is connected to a high-frequency vibration module, and the high-frequency vibration module causes the vaporized methanol molecules to continuously resonate.

[0051] The micro-reaction methanol reforming hydrogen production module is used to produce hydrogen and oxygen, and assists the methanol rail injection module, the air heating module and the high-frequency vibration module to ignite the methanol fuel at ultra-low temperatures.

[0052] The following problems exist when using automotive-grade gasoline engines to directly burn methanol:

[0053] 1. Poor cold start performance. Only a small amount of methanol evaporates during constant temperature start-up, and methanol vapor is slightly heavier than air, making it easier to diffuse and dilute. The concentration of the combustible mixture does not reach the ignition limit. In addition, the flash point of methanol is 12°C, and the flash point of gasoline is -50°C, so it is very difficult to ignite.

[0054] 2. It is highly corrosive. The calorific value of methanol has a downward effect and a swelling effect on non-ferrous metals and rubber parts respectively. The low calorific value of methanol will lead to incomplete combustion, and the residual methanol will emulsify the engine oil and corrode rubber parts.

[0055] In this embodiment, the extended-range methanol engine 2 is improved by using an automotive-grade gasoline engine. The automotive-grade gasoline engine has the characteristics of mature technology, small size, high thermal efficiency, etc., and is widely used in extended-range hybrid vehicles at home and abroad.

[0056] In this embodiment, a methanol rail injection module is provided, which is located outside the throttle intake pipe of the automotive-grade gasoline engine, and the original fuel injection path of the fuel injector of the automotive-grade gasoline engine is changed. The outlet of the methanol rail injection module is connected to the air heating module. The air heating module heats the air to increase the temperature of the methanol liquid sprayed from the methanol rail injection module to vaporize the methanol, and increases the calorific value of the methanol from 4650kcal / kg to 10490kcal / kg, the same calorific value of gasoline. The high-frequency vibration module continuously generates high-frequency vibrations to continuously resonate the methanol molecules vaporized from the air heating module, thereby increasing the movement speed and collision frequency between the methanol molecules. Methanol is dispersed into smaller molecules, which are easier to mix with air, which is conducive to the full combustion of methanol and obtains a gain effect of improving fuel efficiency.

[0057] The micro-reaction methanol reforming hydrogen production module is an emergency start module, which is started when the outdoor temperature is as low as minus 40°C. The specific start-up method is that the micro-reaction methanol reforming hydrogen production module generates hydrogen and oxygen as combustion aids by electrolyzing water, and assists the methanol injection rail module, the air heating module and the high-frequency vibration module to ignite the methanol fuel at ultra-low temperature, thereby obtaining an ultra-low temperature start-up gain effect, and stops when the extended-range methanol engine 2 works normally. In this embodiment, ultra-low temperature refers to minus 40 degrees.

[0058] After the improvement, methanol can be burned directly without corroding the cylinder, and the thermal efficiency can be increased from 41% to 51%. In actual production, the following improvements are also included:

[0059] 1. Anodize the cylinder head of the automotive-grade extended-range gasoline engine to improve its antioxidant capacity.

[0060] 3. Replace the sealing ring in the oil pump of the automotive-grade extended-range gasoline engine with a polytetrafluoroethylene rubber ring.

[0061] The advantages of the improvements include:

[0062] 1. It can work with methanol and gasoline dual fuels.

[0063] 2. The thermal efficiency of methanol fuel is as high as 51%. Methanol fuel has a higher cost-effectiveness ratio and is more economical to use. 2 liters of methanol can generate the same amount of electricity as 1 liter of gasoline. The cost of 2 liters of methanol is lower than that of 1 liter of gasoline.

[0064] 3. Methanol is a renewable and clean energy. Green methanol is the ultimate energy source for achieving carbon neutrality and is in line with the national policy requirements for greening the ocean.

[0065] In this embodiment, the battery pack 6 is a wide temperature sodium ion battery pack, which has 10C fast charge and 15C fast discharge performance, and takes into account high and low temperature wide temperature discharge performance, and can work normally in an environment of -50°C and +70°C. Compared with the lithium ion battery pack, there is no need to add heating and liquid cooling functions, which reduces battery energy consumption and improves the effective utilization rate of the sodium ion battery pack energy.

[0066] The specific working principle in this embodiment is as follows:

[0067] The methanol fuel tank 1 is used to provide fuel to the extended-range methanol engine 2. Under normal circumstances, the sodium ion battery pack 6 is charged by the new energy power generation system, and the sodium ion battery pack 6 and the drive motor 9 are powered.

[0068] When the charging control module 7 detects that the power level of the sodium ion battery pack 6 is lower than 30%, the extended-range methanol engine 2 drives the generator 5 to work, and the generator 5 charges the sodium ion battery pack 6. At the same time, the generator 5 directly supplies power to the drive motor 9, and the discharge control module 8 disconnects the sodium ion battery pack 6 from the drive motor 9.

[0069] When the power of the sodium ion battery pack 6 reaches 80%, the extended-range methanol engine 2 and the generator 5 stop working at the same time, the sodium ion battery pack 6 supplies power to the drive motor 9, and the new energy power generation system charges the sodium ion battery pack 6, which can reduce the risk of thermal runaway caused by heating of the battery pack due to fast charging.

[0070] In this embodiment, the new energy power generation system and the generator 5 cooperate to make full use of the new energy. At the same time, methanol is used to generate electricity when the new energy supply is insufficient, so that the ship can continue to sail normally. In this way, fuel consumption can be reduced and costs can be reduced while ensuring the normal travel of the ship. In addition, when the sodium ion battery pack 6 is fast charged, the risk of thermal runaway caused by the heating of the battery pack caused by fast charging can be reduced.

[0071] In this embodiment, through the coordination of various components, pure methanol is used as fuel, and the thermal efficiency of the extended-range methanol engine 2 is improved, which can ensure the endurance of the ship, has no pollution in emissions, reduces noise, and makes the equipment operation cost low.

[0072] The new energy power generation system in this embodiment includes a solar power generation system 3 and a breeze power generation system 4. In this embodiment, the new energy power generation system includes a 50kwh solar power generation system and a 10kwh breeze power generation system, realizing wind-solar complementarity and charging the sodium ion battery pack 6.

[0073] This embodiment also includes a throttle pedal detection sensor, which can detect the pedaling amplitude of the throttle pedal 10 and send the information to the charging control module 7 and the discharging control module 8.

[0074] In this embodiment, a throttle pedal detection sensor is provided, which has two working modes when used:

[0075] Mode 1: Through the cooperation of the charging control module 7 and the discharging control module 8, the charging and power transmission of the sodium ion battery pack 6 are automatically distributed according to the power of the sodium ion battery pack 6, and the charging and power transmission of the sodium ion battery pack 6 are intelligently switched.

[0076] Mode 2: Through the cooperation of the charging control module 7 and the discharging control module 8, the adjustment is made according to the pedaling amplitude of the accelerator pedal 10. When the driver steps on the accelerator pedal to 60% and the power drops to 30%, the extended-range methanol engine 2 starts, the generator 5 charges the sodium ion battery pack 6, and the generator 5 directly supplies power to the drive motor 9. When the accelerator pedal 10 is stepped on to 70% and the power is higher than 30%, the sodium ion battery pack 6 and the generator 5 simultaneously supply power to the drive motor 9 to obtain maximum power output.

[0077] The accelerator pedal detection sensor in this embodiment is a potential sensor.

[0078] The methanol tank 1 in this embodiment is a 30L tank.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A pure methanol fuel extended-range hybrid system for ships, characterized in that: It comprises a methanol fuel tank (1), an extended-range methanol engine (2), a new energy power generation system, a generator (5), a battery pack (6), a charging control module (7), a discharging control module (8) and a driving motor (9). The methanol fuel tank (1) is connected to the extended-range methanol engine (2), the extended-range methanol engine (2) is connected to the generator (5), and the generator (5) is connected to the battery pack (6). The new energy power generation system is connected to the battery pack (6). The battery pack (6) is connected to the drive motor (9). The generator (5) is connected to a driving motor (9). The charging control module (7) is capable of detecting the power level of the battery pack (6) and controlling the start-up of the extended-range methanol engine (2). The charging control module (7) is capable of controlling the connection and disconnection between the extended-range methanol engine (2) and the drive motor (9). The discharge control module (8) is capable of controlling the connection and interruption between the battery pack (6) and the drive motor (9).

2. A pure methanol fuel extended-range hybrid power system for ships according to claim 1, characterized in that: The extended-range methanol engine (2) comprises an automotive-grade gasoline engine, a methanol rail injection module, an air heating module, a high-frequency vibration module and a micro-reaction methanol reforming hydrogen production module; The methanol injection rail module is located outside the throttle intake pipe of the automotive-grade gasoline engine. The outlet of the methanol injection rail module is connected to the air heating module, and the air heating module is used to increase the temperature of the methanol liquid and vaporize it. The air heating module is connected to a high-frequency vibration module, and the high-frequency vibration module causes the vaporized methanol molecules to continuously resonate. The micro-reaction methanol reforming hydrogen production module is used to produce hydrogen and oxygen, and assists the methanol rail injection module, the air heating module and the high-frequency vibration module to ignite the methanol fuel at ultra-low temperatures.

3. A pure methanol fuel extended-range hybrid power system for ships according to claim 1, characterized in that: The new energy power generation system comprises a solar power generation system (3) and a breeze power generation system (4).

4. A pure methanol fuel extended-range hybrid power system for ships according to claim 1, characterized in that: It also includes a throttle pedal detection sensor, which can detect the pedaling amplitude of the throttle pedal (10) and send the information to the charging control module (7) and the discharging control module (8).

5. A pure methanol fuel extended-range hybrid power system for ships according to claim 4, characterized in that: The accelerator pedal detection sensor is a potential sensor.

6. A pure methanol fuel extended-range hybrid power system for ships according to claim 1, characterized in that: The methanol tank (1) is a 30L tank.

7. A pure methanol fuel extended-range hybrid power system for ships according to claim 1, characterized in that: The battery pack (6) is a sodium ion battery pack.

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