CN215907984U - Methanol/diesel dual-fuel engine alcohol rail - Google Patents

Abstract

The invention relates to the field of dual-fuel engines, in particular to an alcohol rail of a methanol/diesel dual-fuel engine, which comprises a rail pipe, an alcohol inlet branch pipe, a methanol inlet and an alcohol rail support. The alcohol inlet branch pipe is fixedly connected and communicated with the side wall of the rail pipe. The methanol inlet is fixedly connected and communicated with the end part of the rail pipe. The alcohol rail support is fixedly connected with the side wall of the rail pipe. The alcohol rail design meets the multi-point injection requirement of the dual-fuel engine, so that the pressurized air and the methanol are mixed in the air inlet branch pipes of the cylinders to form homogeneous mixed gas, and then the homogeneous mixed gas enters the engine. The overlapping angle of air inlet and air outlet of the engine is avoided, and the aim of 'quasi-internal mixing' methanol blending combustion of the marine diesel engine is fulfilled. In addition, the engine realizes that the methanol is sprayed at the opening time of the air inlet valve of the engine according to the ignition sequence of each cylinder of the engine by controlling the opening time of the methanol electronic injection valve, thereby realizing the aim of supplying the methanol at multiple points, at fixed time and in fixed quantity.

Description

Methanol/diesel dual-fuel engine alcohol rail

Technical Field

The invention relates to the field of dual-fuel engines, in particular to an alcohol rail of a methanol/diesel dual-fuel engine.

Background

The dual fuel engine alcohol fuel is supplied to the engine alcohol rail by an external methanol pump methanol fuel and establishes rail pressure. The methanol electrojet valve connects each branch pipe of the alcohol rail with each air inlet branch pipe of the engine. The opening and closing of each methanol electronic injection valve is controlled by an engine ECU, and methanol fuel enters a combustion chamber through each cylinder air inlet branch pipe of the engine along with engine air inlet. The methanol fuel and air form homogeneous methanol and air mixed gas in the engine combustion chamber, so that the aim of co-burning methanol in a quasi-internal mixing mode of the diesel engine is fulfilled.

According to the plan suggestion of 'thirteen five': the method has the advantages of promoting green and clean production, promoting the green reconstruction of the traditional manufacturing industry, promoting the establishment of a green low-carbon cycle development industrial system, encouraging the updating and reconstruction of enterprise process technology equipment, promoting the low-carbon development of transportation, reforming an environmental management basic system, establishing an enterprise emission permission system covering all fixed pollution sources, developing environmental protection supervision and inspection, strictly protecting the environment and enforcing law, and developing alternative fuel engines.

The methanol is rich in production raw materials, coal, natural gas, coke oven gas and biomass and even carbon dioxide can be used, in addition, the methanol has the properties of high latent heat of vaporization, oxygen and single carbon, the combustion speed is more than one time faster than that of gasoline, and no smoke and flame exist during combustion. The mode of co-combustion of methanol and diesel oil is adopted, so that clean combustion can be realized, and the method is a technical breakthrough of a single-fuel compression ignition mode of the traditional diesel engine. The methanol partially replaces diesel oil, can reduce petroleum consumption, promotes the application of low-carbon fuel, realizes the energy technical revolution, and has important and positive significance for the national sustainable development.

Diesel/methanol combination combustion technology has been successfully applied on heavy trucks. The technology is not only suitable for the production of new vehicles, but also can be used for the transformation of in-use vehicles. Is currently applied in 2 markets of 12 provinces, and the number of the plants exceeds 150. The methanol automobile test points of the new automobile participating in the organization of the Ministry of industry and communications are applied to Yulin in Shaanxi for many years, and the rest are in-use automobiles. The application result shows that the vehicle with the diesel and methanol combined combustion technology has sufficient power and quick acceleration, the methanol replaces the diesel by more than 30 percent, the fuel cost is saved by 15 to 20 percent, and the vehicle is popular with users.

The application of methanol to solve the problem of the emission of the marine diesel engine is precedent internationally. The german MAN company and the winyland company have developed methanol marine diesel engines for the international meisenis group and have achieved good results in many shipboard applications. The japan mitsui company also developed ships similar to those equipped with methanol diesel dual fuel engines. There is a worldwide resurgence in the use of methanol blended with diesel fuel to reduce emissions from ships and to reduce operating costs. The methanol blended combustion has a remarkable advantage that the general marine fuel contains a high proportion of sulfur, and a large amount of sulfur oxide (SOx) is discharged during combustion, which is a main component forming acid rain. Methanol itself contains no sulfur, and therefore, co-firing of methanol also serves to reduce SOx emissions.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: provides a methanol/diesel dual-fuel engine alcohol rail which can realize quasi-internal mixed co-combustion of methanol and multi-point, timed and quantitative supply of methanol.

The technical scheme of the technical problem to be solved by the invention is as follows: a methanol/diesel dual-fuel engine alcohol rail is characterized by comprising a rail pipe; the alcohol inlet branch pipe is fixedly connected and communicated with the side wall of the rail pipe; the methanol inlet is fixedly connected and communicated with the end part of the rail pipe;

the alcohol rail support is fixedly connected with the side wall of the rail pipe.

Preferably, the rail pipe is a rectangular pipe.

Preferably, the material of the rail pipe is 06Gr19Ni10 stainless steel.

Preferably, the rail pipe is provided with a base hole for connecting the alcohol inlet branch pipe.

Preferably, the alcohol inlet branch pipe is connected with an electronic injection valve.

Preferably, an O-shaped ring is arranged between the alcohol inlet branch pipe and the electric injection valve for sealing.

Preferably, the end part of the rail pipe is provided with a methanol pressure temperature sensor connecting seat.

Preferably, the end part of the rail pipe is provided with a methanol pressure temperature sensor connecting seat.

Preferably, two methanol inlets are arranged.

Preferably, the methanol inlet is integrated with a supercharged air pressure and temperature detection interface.

The invention has the beneficial effects that:

the alcohol rail design meets the multi-point injection requirement of the dual-fuel engine, so that the pressurized air and the methanol are mixed in the air inlet branch pipes of the cylinders to form homogeneous mixed gas, and then the homogeneous mixed gas enters the engine. The overlapping angle of air inlet and air outlet of the engine is avoided, and the aim of 'quasi-internal mixing' methanol blending combustion of the marine diesel engine is fulfilled. In addition, the engine realizes that the methanol is sprayed at the opening time of the air inlet valve of the engine according to the ignition sequence of each cylinder of the engine by controlling the opening time of the methanol electronic injection valve, thereby realizing the aim of supplying the methanol at multiple points, at fixed time and in fixed quantity.

Drawings

FIG. 1 is a schematic perspective view of one embodiment of the present invention.

Fig. 2 is a cross-sectional view of one embodiment of the present invention.

Fig. 3 is a front view of one embodiment of the present invention.

In the figure:

4. supporting the alcohol rail; 1. a methanol inlet; 2. an alcohol inlet branch pipe; 3. a rail pipe;

Detailed Description

In order to make the technical solution and the advantages of the present invention clearer, the following explains embodiments of the present invention in further detail.

A methanol/diesel dual-fuel engine alcohol rail comprises a rail pipe 3, an alcohol inlet branch pipe 2, a methanol inlet 1 and an alcohol rail support 4.

The rail pipe 3 is tubular and can be a round pipe, a square pipe and the like. The rail pipe 3 in the embodiment is a rectangular pipe, and has the beneficial effects of convenience in processing and fixed installation. The material of the rail pipe 3 is 06Gr19Ni10 stainless steel.

In order to fill each cylinder with a mixed gas of methanol and air, an alcohol inlet branch pipe 2 is provided on the rail pipe 3. The alcohol inlet branch pipe is fixedly connected and communicated with the side wall of the rail pipe 3. The rail pipe 3 is a pipeline with two closed ends, and one end of the rail pipe 3 is provided with a methanol inlet 1. The methanol inlet 1 is fixedly connected and communicated with the end part of the rail pipe 3, and two methanol inlets 1 are arranged. The methanol inlet is connected with a guide pipe provided with air inlet and used for being connected with a methanol pump.

Preferably, the rail pipe 3 is provided with a base hole for facilitating installation and positioning. The base holes are arranged corresponding to the positions of the cylinders according to the rail pipes 3, wherein the axial line of the base holes corresponds to the axial line of the cylinder core of each cylinder. Each alcohol inlet branch pipe is connected with the alcohol rail by adopting a welding structure.

Further, in order to realize the timed and quantitative injection of the mixed gas, the alcohol inlet branch pipe 2 is connected with an electric injection valve, so that the control requirements of cylinder-by-cylinder alcohol inlet and single cylinder control are met. The electronic injection valve controls the injection quantity and the injection time of the methanol when an engine intake valve is opened according to the gas distribution timing of the engine, and the methanol enters a combustion chamber through an intake manifold of each cylinder, so that the aim of diesel oil co-combustion is fulfilled by the methanol through a sequential multipoint injection mode. An O-shaped ring seal is arranged between the alcohol inlet branch pipe 2 and the electric injection valve to realize sealing.

In order to mount the rail pipe 3, an alcohol rail support 4 is provided on the side wall of the rail pipe 3. The alcohol rail support 4 is fixedly connected with the side wall of the rail pipe 3, and is used as a base to be fixedly connected with an air inlet pipe of an engine. The methanol inlet 1 is integrated with a supercharged air pressure and temperature detection interface for detecting the temperature and pressure of input methanol. When the pressure or temperature outlet is abnormal, the system can cut off the methanol inlet in time, and the running safety of the engine is ensured.

One end of the rail pipe 3 is provided with a methanol fuel double-inlet design, and the inlet is connected with a methanol supply system. The methanol supply system supplies methanol fuel to the rail pipe 3 by a methanol pump, the rail pressure of the methanol rail pipe 3 is kept, and the tail end of the rail pipe 3 is provided with a connecting seat of a methanol pressure and temperature sensor.

The methanol supply system realizes the multipoint sequential control of methanol feeding through methanol electrojet valves arranged on the methanol feeding branch pipes. The control system sprays methanol into the air inlet branch pipes of the cylinders in the air inlet process of the engine according to the distribution phase of the engine, the methanol forms homogeneous mixed gas with air in the air inlet branch pipes of the cylinders, and then the homogeneous mixed gas enters the combustion chamber, so that the aim of 'quasi-internal mixing' co-combustion of the methanol in the marine diesel engine is fulfilled.

In summary, the present invention is only a preferred embodiment, and is not intended to limit the scope of the present invention, and various changes and modifications can be made by workers in the light of the above description without departing from the technical spirit of the present invention. The technical scope of the present invention is not limited to the content of the specification, and all equivalent changes and modifications in the shape, structure, characteristics and spirit described in the scope of the claims of the present invention are included in the scope of the claims of the present invention.

Claims (10)

1. A methanol/diesel dual-fuel engine alcohol rail is characterized in that:

the method comprises the following steps:

a rail pipe (3);

the alcohol inlet branch pipe (2) is fixedly connected and communicated with the side wall of the rail pipe (3);

the methanol inlet (1) is fixedly connected and communicated with the end part of the rail pipe (3);

the alcohol rail support (4) is fixedly connected with the side wall of the rail pipe (3).

2. The methanol/diesel dual fuel engine alcohol rail of claim 1, wherein:

the rail pipe (3) is a rectangular pipe.

3. A methanol/diesel dual fuel engine alcohol rail according to claim 1 or 2, characterized in that:

the material of the rail pipe (3) is 06Gr19Ni10 stainless steel.

4. A methanol/diesel dual fuel engine alcohol rail of claim 3, wherein:

and a base hole is formed in the rail pipe (3) and used for connecting the alcohol inlet branch pipe (2).

5. A methanol/diesel dual fuel engine alcohol rail of claim 3, wherein:

the alcohol inlet branch pipe (2) is connected with an electrojet valve.

6. The methanol/diesel dual fuel engine alcohol rail of claim 5, wherein:

an O-shaped ring seal is arranged between the alcohol inlet branch pipe (2) and the electric injection valve.

7. A methanol/diesel dual fuel engine alcohol rail of claim 3, wherein:

the end part of the rail pipe (3) is provided with a methanol pressure temperature sensor connecting seat.

8. A methanol/diesel dual fuel engine alcohol rail according to claim 5 or 6, characterized in that:

the end part of the rail pipe (3) is provided with a methanol pressure temperature sensor connecting seat.

9. The methanol/diesel dual fuel engine alcohol rail of claim 1, wherein:

the number of the methanol inlets (1) is two.

10. The methanol/diesel dual fuel engine alcohol rail of claim 1, wherein:

the methanol inlet (1) is integrated with a supercharged air pressure and temperature detection interface.

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