Modular multi-fuel reserved low-carbon and zero-carbon dual-fuel engine

Abstract

The present invention relates to the technical field of mechanical engineering, and relates to a modular multi-fuel reserved low-carbon and zero-carbon dual-fuel engine. The engine comprises a cylinder head assembly; the cylinder head assembly is provided with a high-pressure dual-fuel injection cylinder head; the high-pressure dual-fuel injection cylinder head is provided with diesel injectors, new fuel injectors, and an exhaust valve mechanism; the diesel injectors are connected to a diesel supply module; the new fuel injectors are connected to a new fuel supply and purge module; the diesel injectors, the new fuel injectors, and the exhaust valve mechanism are all connected to a servo oil drive module; the diesel injectors, the new fuel injectors, and the exhaust valve mechanism are all driven by means of servo oil; and the required control pressure is achieved by means of a corresponding servo oil pressure boosting or reducing unit. In the present invention, a modular design mode is used for normal-pressure or high-pressure liquid fuels such as methanol, ammonia, and LPG, realizing multi-fuel shared design and reservation to the greatest extent. Rapid replacement of different low-speed fuel engines can be achieved by replacing only a few modules.

Description

Modular multi-fuel pre-reserved low-carbon zero-carbon dual-fuel engine TECHNICAL FIELD

[0001] The present application relates to new fuel engine technology, belonging to mechanical engineering technical field, especially to a kind of modular multi-fuel pre-reserved low-carbon zero-carbon dual-fuel engine. BACKGROUND

[0002] With the proposal of IMO greenhouse gas emission reduction strategy and double carbon strategy, the future ship power market forms the pattern of diesel, LNG, methanol, ammonia and other multi-fuel competition, and different ship owners' demand for new fuel power is more and more diversified. Due to the difference of fuel chemical properties, the specific technical requirements and combustion organization mode of different fuel injectors exist certain difference, it is very difficult to develop a low-speed engine that can burn any fuel. SUMMARY

[0003] The purpose of the present application is: the present application proposes a design concept of seeking commonness and keeping differences, for methanol, ammonia, LPG and other normal pressure or high pressure liquid fuel, adopts modular design method, realizes multi-fuel common design and reservation to the greatest extent, and only a small part of modules are replaced, so that the quick replacement of different fuel low-speed engine can be realized.

[0004] In order to achieve the above purpose, the technical scheme of the present application provides a kind of modular multi-fuel pre-reserved low-carbon zero-carbon dual-fuel engine, including cylinder head assembly, the cylinder head assembly is equipped with high pressure dual fuel injection cylinder head, the high pressure dual fuel injection cylinder head is equipped with diesel injector, new fuel injector and exhaust valve mechanism, the diesel injector is connected with diesel supply module, the new fuel injector is connected with new fuel supply and purging module, the diesel injector, the new fuel injector and the exhaust valve mechanism are simultaneously connected with servo oil driving module;The diesel injector acts as pilot in new fuel combustion mode and acts as main combustion in diesel combustion mode;The diesel injector, the new fuel injector, the exhaust valve mechanism are all driven by servo oil, and the control pressure required is realized by corresponding servo oil pressurizing or depressurizing unit.

[0005] Preferably, the diesel injector and the new fuel injector are both provided with two, and are both distributed on both sides of the exhaust valve mechanism.

[0006] Preferably, the injection pressure of new fuel is between 500-700bar, the servo oil pump provides 200-350bar adjustable servo oil pressure, and the diesel pump group provides 8bar engine diesel pressure.

[0007] Preferably, the diesel supply module includes diesel main pipe and diesel branch pipe connected with the diesel injector.

[0008] Preferably, the new fuel supply and purge module comprises a new fuel main pipe and a new fuel distribution block connected with the new fuel injector.

[0009] Preferably, a three-way valve is connected between the new fuel distribution block and the new fuel main pipe, and the three-way valve is further connected with an inert gas purge main pipe.

[0010] Preferably, the inert gas purge branch pipe is supplied with nitrogen.

[0011] Preferably, the servo oil driving module comprises a servo oil rail, an exhaust valve servo oil control valve and a servo oil distribution block connected with the servo oil rail, an exhaust valve servo oil pressure reducing unit connected with the exhaust valve servo oil control valve and the exhaust valve mechanism, a new fuel injector servo oil control valve connected with the servo oil distribution block and the new fuel injector, and a diesel injector servo oil control valve connected with the servo oil distribution block and the diesel injector.

[0012] Preferably, a new fuel injector servo oil pressure increasing unit is connected between the new fuel injector and the new fuel injector servo oil control valve.

[0013] Preferably, a diesel injector servo oil pressure increasing unit is connected between the diesel injector and the diesel injector servo oil control valve.

[0014] In summary, the present application has the following beneficial technical effects:

[0015] The present application is aimed at methanol, ammonia, LPG and other normal pressure or high pressure liquid fuels, adopts a modular design method, maximizes the realization of multi-fuel common design and reservation, and only a small part of the modules are replaced, so that the quick replacement of different fuel low-speed machines can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 is a structural schematic diagram of a modular multi-fuel reserved low-carbon zero-carbon dual-fuel engine of the present application.

[0017] Reference signs: 1, cylinder head assembly; 101, high-pressure dual-fuel injection cylinder head; 102, exhaust valve mechanism; 103, diesel injector one; 104, diesel injector two; 105, new fuel injector one; 106, new fuel injector two; 2, servo oil driving module; 201, servo oil pump; 202, servo oil rail; 203, exhaust valve servo oil control valve; 204, exhaust valve servo oil pressure reducing unit; 205, servo oil distribution block; 206, new fuel injector servo oil control valve one; 207, new fuel injector servo oil control valve two; 208, diesel injector servo oil control valve one; 209, diesel injector servo oil control valve two; 210, new fuel injector servo oil pressure increasing unit one; 211, new fuel injector servo oil pressure increasing unit two; 212, diesel injector servo oil pressure increasing unit one; 213, diesel injector servo oil pressure increasing unit two; 3, diesel supply module; 301, diesel main pipe; 4, new fuel supply and purge module; 401, new fuel main pipe; 402, three-way valve; 403, new fuel distribution block; 404, inert gas purge main pipe. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0019] The embodiments of the present application disclose a modular multi-fuel reserved low-carbon zero-carbon dual-fuel engine design method. The main technical features are that the following four modules are designed with multi-fuel reservation, mainly including a cylinder head assembly 1, a servo oil driving module 2, a diesel supply module 3, and a new fuel supply and purge module 4.

[0020] The common technologies that can be used by low-speed dual-fuel engines of methanol, ammonia, LPG and other normal-pressure or high-pressure liquid new fuels are as follows:

[0021] 1) High-pressure injection diesel cycle combustion mode, 2 diesel injectors and 2 new fuel injectors are arranged on the cylinder head of the low-speed engine. The diesel injectors act as pilot in the new fuel combustion mode and act as main combustion in the diesel combustion mode.

[0022] 2) The diesel injector, the new fuel injector, and the exhaust valve mechanism 102 are all servo oil driven, and the required control pressure is realized through the corresponding servo oil pressure increasing or reducing unit. The injection pressure of diesel and methanol, ammonia, LPG and other new fuels is between 500-700 bar;

[0023] 3) New fuel due to low flash point characteristics, need to use double wall pipe design, inert gas purge.

[0024] The low-speed dual-fuel engine mainly adopts multi-fuel reservation design for the following four modules, mainly including cylinder head assembly 1, servo oil driving module 2, diesel fuel supply module 3, and new fuel supply and purge module 4.

[0025] 1) The cylinder head assembly 1 includes: high-pressure dual-fuel injection cylinder head 101, exhaust valve mechanism 102, diesel injector one 103, diesel injector two 104, new fuel injector one 105, and new fuel injector two 106;

[0026] 2) The servo oil driving module 2 includes: servo oil pump 201, servo oil rail 202, exhaust valve servo oil control valve 203, exhaust valve servo oil pressure reducing unit 204, servo oil distribution block 205, new fuel injector servo oil control valve one 206, new fuel injector servo oil control valve two 207, diesel injector servo oil control valve one 208, diesel injector servo oil control valve two 209, new fuel injector servo oil pressure increasing unit one 210, new fuel injector servo oil pressure increasing unit two 211, diesel injector servo oil pressure increasing unit one 212, diesel injector servo oil pressure increasing unit two 213, and corresponding servo oil connection branch pipes;

[0027] 3) The diesel fuel supply module 3 mainly includes diesel fuel main pipe 301 and diesel fuel branch pipe connected to the cylinder head assembly 1;

[0028] 4) The new fuel supply and purge module 4 mainly includes new fuel main pipe 401, three-way valve 402, new fuel distribution block 403, inert gas purge main pipe 404, and corresponding new fuel branch pipes and inert gas purge branch pipes.

[0029] The specific multi-fuel common design and reservation method is as follows:

[0030] 1) The cylinder head assembly 1 is a multi-fuel common module. When methanol, ammonia, LPG, and other different fuel modifications are needed, only new fuel injector one 105 and new fuel injector two 106 need to be replaced, and the others remain unchanged. Ammonia has the lowest heat value, and in order to achieve the same power, the ammonia fuel injector has the highest single-cylinder injection volume. Therefore, the size of the new fuel injector mounting hole of the cylinder head is designed according to the size of the ammonia fuel injector. At the same time, the size of the methanol, LPG, and other new fuel injectors developed for this type of engine and the size of the inlet and outlet interface are consistent with ammonia fuel. By optimizing the cylinder head arrangement position of diesel injector one 103 and diesel injector two 104, as well as new fuel injector one 105 and new fuel injector two 106, the ignition combustion requirements of methanol, ammonia, and LPG fuels are considered;

[0031] 2) Servo oil drive module 2 multi-fuel is common module, when different fuel modification of methanol, ammonia, LPG, etc., no need to replace. Servo oil pump 201 on board provides 200-350bar adjustable servo oil pressure, the capacity of servo oil rail 202 is designed according to ammonia fuel, the servo oil capacity of single cylinder is the sum of the servo oil demand of exhaust valve mechanism 102, new fuel injector one 105 and new fuel injector two 106, diesel injector one 103 and diesel injector two 104, the servo oil rail 202 capacity is the demand of single cylinder multiplied by the number of cylinders. Exhaust valve servo oil pressure reducing unit 204 is designed as a fixed pressure ratio, diesel injector servo oil pressure increasing unit one 212 and diesel injector servo oil pressure increasing unit two 213, new fuel injector servo oil pressure increasing unit one 210 and new fuel injector servo oil pressure increasing unit two 211 are designed as a fixed pressure ratio, the engine under different loads, servo oil pump 201 on board adjusts the servo oil pressure uniformly.

[0032] 3) Diesel module is a multi-fuel common module, when different fuel modification of methanol, ammonia, LPG, etc., no need to replace. Off-board diesel pump group provides 8bar engine diesel pressure, which is distributed to diesel injector one 103 and diesel injector two 104 on each cylinder head assembly 1 through diesel manifold 301.

[0033] 4) New fuel supply and purge module 4 is a customized module, when different fuel modification of methanol, ammonia, LPG, etc., the whole needs to be replaced (including new fuel lines connected to cylinder head assembly 1). The liquefaction pressure, viscosity and corrosivity of methanol, ammonia, LPG and other new fuels at different temperatures are quite different, the requirements for pipes and seals are different, and the materials selected are also different. The same schematic diagram can be used in the design, but new fuel manifold 401, three-way valve 402, new fuel distribution block 403, inert gas purge manifold 404 and related pipes involved need to be customized and developed according to the fuel characteristics.

[0034] Finally, it should be pointed out that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent replacements of some technical features, as long as they are within the spirit and principles of the present application. Any modification, equivalent replacement, improvement, etc. made within the scope of the present application should be included in the protection scope of the present application.

Claims

1. A modular multi-fuel pre-reserve low carbon zero carbon dual fuel engine characterized in that, The cylinder head assembly (1) is provided with a high-pressure dual-fuel injection cylinder head (101), which is provided with a diesel injector, a new fuel injector, and an exhaust valve mechanism (102). The diesel injector is connected with a diesel supply module (3), the new fuel injector is connected with a new fuel supply and purging module (4), and the diesel injector, the new fuel injector, and the exhaust valve mechanism (102) are simultaneously connected with a servo oil driving module (2). The diesel injector functions as a pilot in a new fuel combustion mode and functions as a main fuel in a diesel combustion mode. The diesel injector, the new fuel injector, and the exhaust valve mechanism (102) are all servo oil driven, and the required control pressure is realized through corresponding servo oil pressurizing or depressurizing units.

2. A modular multi-fuel pre-reserve low carbon zero carbon dual fuel engine as claimed in claim 1, wherein, Both the diesel injector and the new fuel injector are provided in two and are distributed on both sides of the exhaust valve mechanism (102).

3. A modular multi-fuel pre-reserve low carbon zero carbon dual fuel engine as claimed in claim 3, wherein, The injection pressure of the new fuel is between 500-700 bar, the servo oil pump (201) provides an adjustable servo oil pressure of 200-350 bar, and the diesel pump group provides an 8 bar engine diesel pressure.

4. A modular multi-fuel pre-reserve low carbon zero carbon dual fuel engine according to any one of claims 1 to 3, characterized in that, The diesel supply module (3) comprises a diesel manifold (301) and a diesel branch pipe connected with the diesel injector.

5. A modular multi-fuel pre-reserve low carbon zero carbon dual fuel engine according to any one of claims 1 to 3, characterized in that, The new fuel supply and purging module (4) comprises a new fuel manifold (401) and a new fuel distribution block (403) connected with the new fuel injector.

6. A modular multi-fuel pre-reserve low carbon zero carbon dual fuel engine as claimed in claim 5 wherein, The new fuel distribution block (403) is connected with the new fuel manifold (401) through a three-way valve (402), and the three-way valve (402) is further connected with an inert gas purging manifold (404).

7. A modular multi-fuel pre-reserve low carbon zero carbon dual fuel engine as claimed in claim 7, wherein, The inert gas purging branch pipe is provided with nitrogen.

8. A modular multi-fuel pre-reserve low carbon zero carbon bi-fuel engine according to any one of claims 1-3, characterized in that, The servo oil driving module (2) comprises a servo oil rail (202), an exhaust valve servo oil control valve (203) and a servo oil distribution block (205) connected with the servo oil rail (202), an exhaust valve servo oil depressurizing unit (204) connected with the exhaust valve servo oil control valve (203) and the exhaust valve mechanism (102), a new fuel injector servo oil control valve connected with the servo oil distribution block (205) and the new fuel injector, and a diesel injector servo oil control valve connected with the servo oil distribution block (205) and the diesel injector.

9. A modular multi-fuel pre-reserve low carbon zero carbon dual fuel engine as claimed in claim 8, wherein, The new fuel injector is connected with a new fuel injector servo oil pressurizing unit.

10. A modular multi-fuel pre-reserve low carbon zero carbon dual fuel engine as claimed in claim 9, wherein, The diesel injector is connected with a diesel injector servo oil pressurizing unit.

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