阅读说明：本技术 一种甲醇/柴油双燃料发动机进醇系统 (Methanol/diesel dual-fuel engine alcohol inlet system ) 是由 黄蒙 辛强之 杨尚刚 姚安仁 刘毅 王延瑞 贾宝福 袁磊 张洪祥 闫丽 牛志坚 于 2021-08-14 设计创作，主要内容包括：本发明涉及双燃料发动机领域,具体为一种甲醇/柴油双燃料发动机进醇系统,甲醇醇轨通过醇轨支架与发动机进气管固定连接,各缸进气支管设置在发动机进气管上且设有电喷阀接座,电喷阀接座连接有甲醇电喷阀,甲醇电喷阀与甲醇醇轨的进醇支管连通。控制器检测甲醇醇轨内部的甲醇的压力和温度到达设定值时,根据发火顺序控制甲醇电喷阀在发动机排气门关闭后定时定量在发动机各缸各缸进气支管喷射甲醇。该设计满足双燃料发动机多点喷射要求,使增压空气与甲醇在各缸进气支管内混和后形成均质混合气,然后进入发动机。通过定时定量多点顺序喷射控制,降低了发动机燃料的浪费,提高了发动机的热效率,优化了发动机的排放,向绿色环保发动机又迈进了一大步。(The invention relates to the field of dual-fuel engines, in particular to an alcohol inlet system of a methanol/diesel dual-fuel engine. When the controller detects that the pressure and the temperature of methanol in the methanol alcohol rail reach set values, the methanol electronic injection valve is controlled according to the ignition sequence to inject the methanol in the air inlet branch pipe of each cylinder of the engine in a fixed time and fixed quantity mode after the exhaust valve of the engine is closed. The design meets the requirement of multi-point injection of the dual-fuel engine, and pressurized air and methanol are mixed in the air inlet branch pipes of the cylinders to form homogeneous mixed gas which then enters the engine. Through the timed, quantitative and multipoint sequential injection control, the waste of engine fuel is reduced, the heat efficiency of the engine is improved, the emission of the engine is optimized, and a great step is taken towards an environment-friendly engine.)

1. The utility model provides a methyl alcohol diesel oil dual-fuel engine advances mellow wine system, includes dual-fuel engine body, dual-fuel engine body is equipped with engine intake pipe, its characterized in that:

further comprising:

the methanol-alcohol rail (2) is tubular with two closed ends, and the methanol-alcohol rail (2) is fixedly connected with an engine air inlet pipe through an alcohol rail bracket (3); the head end of the methanol-alcohol rail (2) is provided with a methanol inlet (1), the tail part of the methanol-alcohol rail (2) is provided with a temperature and pressure sensor connecting seat (4), and the temperature and pressure sensor connecting seat (4) is provided with a temperature and pressure sensor;

the number of the air inlet branch pipes (3) of each cylinder is the same as that of the cylinders of the engine, and the air inlet branch pipes (3) of each cylinder are arranged on an air inlet pipe of the engine; each cylinder air inlet branch pipe (3) is provided with an electric injection valve connecting seat (5), the electric injection valve connecting seat (5) is connected with a methanol electric injection valve (6), and the methanol electric injection valve (6) is communicated with an alcohol inlet branch pipe of the methanol alcohol rail (2);

and when the controller detects that the pressure and the temperature of methanol in the methanol alcohol rail (2) reach set values, the controller controls the methanol electronic injection valve (6) to inject the methanol at fixed time and quantity in the air inlet branch pipe of each cylinder of the engine after the exhaust valve of the engine is closed according to the ignition sequence.

2. The methanol/diesel dual-fuel engine alcohol inlet system as claimed in claim 1, characterized in that:

the methanol alcohol rail (2) is a rectangular pipe.

3. The methanol/diesel dual-fuel engine alcohol inlet system as claimed in claim 1, characterized in that:

the methanol alcohol rail (2) is made of stainless steel.

4. The methanol/diesel dual-fuel engine alcohol inlet system as claimed in claim 1, characterized in that:

the alcohol inlet branch pipes are arranged in sequence according to the cylinder center distance of the engine.

5. The methanol/diesel dual-fuel engine alcohol inlet system as claimed in claim 1, characterized in that:

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, and the methanol is mixed with air in the air inlet branch pipes (3) of the cylinders and then enters the combustion chamber to form a homogeneous mixture.

6. The methanol/diesel dual-fuel engine alcohol inlet system as claimed in claim 1, characterized in that:

the methanol inlet is provided with two methanol inlets.

7. A methanol/diesel dual fuel engine alcohol inlet system as claimed in claim 3, characterized in that:

the stainless steel is 06Gr19Ni10 stainless steel.

8. The methanol/diesel dual-fuel engine alcohol inlet system as claimed in claim 1, characterized in that:

the methanol-alcohol rail (2) is provided with a base hole for installing an alcohol inlet branch pipe.

9. The methanol/diesel dual-fuel engine alcohol inlet system as claimed in claim 8, wherein:

the base holes are arranged in sequence according to the cylinder center distance of the engine.

Technical Field

The invention relates to the field of dual-fuel engines, in particular to an alcohol inlet system 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 electronic injection 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.

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 technical breakthrough of the traditional diesel engine single fuel pressure combustion mode is realized. 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 provided 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. Japan mitsui 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.

At present, the methanol fuel out-of-cylinder mixing is mainly air inlet manifold mixing. The methanol fuel and the air form fuel mixed gas in an air inlet main pipe of the engine, and then the fuel mixed gas enters the air inlet branch pipes of the cylinders and finally enters the air cylinders. The design structure is simple, the purpose of blending and burning the methanol in the diesel engine is realized, but the design can not avoid the overlap angle of air inlet and air outlet of the diesel engine, so that part of fuel is discharged along with scavenging of the engine, and the discharged part is directly discharged into an exhaust pipe without applying work, so that fuel waste is caused, the thermal efficiency of the engine is reduced, and the emission of the engine is deteriorated. In addition, part of the fuel is burned in the exhaust pipe, which causes adverse effects such as high engine exhaust temperature.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: provides a methanol/diesel dual-fuel engine alcohol inlet system which can realize quasi-internal mixing and methanol blending combustion and can supply methanol at multiple points and at fixed time and fixed quantity.

The technical scheme of the technical problem to be solved by the invention is as follows: the utility model provides a methyl alcohol diesel oil dual-fuel engine advances mellow wine system, includes two fuel engine bodies, two fuel engine bodies are equipped with the engine intake pipe, its characterized in that still includes: methanol alcohol rail, each cylinder air inlet branch pipe, temperature pressure sensor, electric injection valve connecting seat and methanol electric injection valve. The methanol-alcohol rail is in a tubular shape with two closed ends and is fixedly connected with an engine air inlet pipe through an alcohol rail bracket; the head end of the methanol alcohol rail is provided with a methanol inlet, the tail part of the methanol alcohol rail is provided with a temperature and pressure sensor connecting seat, and the temperature and pressure sensor connecting seat is provided with a temperature and pressure sensor; the number of the air inlet branch pipes of each cylinder is the same as that of the cylinders of the engine, and the air inlet branch pipes of each cylinder are arranged on an air inlet pipe of the engine; each cylinder air inlet branch pipe is provided with an electric injection valve connecting seat, the electric injection valve connecting seat is connected with a methanol electric injection valve, and the methanol electric injection valve is communicated with an alcohol inlet branch pipe of a methanol alcohol rail; when the control system detects that the pressure and the temperature of methanol in the methanol alcohol rail reach set values, the methanol electronic injection valve is controlled according to the ignition sequence to inject the methanol in the air inlet branch pipe of each cylinder of the engine in a timed and quantitative mode after the exhaust valve of the engine is closed.

Preferably, the methanol alcohol rail is a rectangular pipe.

Preferably, the methanol alcohol rail is made of stainless steel.

Preferably, the alcohol inlet branch pipes are arranged in sequence according to the cylinder center distance of the engine.

Preferably, 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, and the methanol is mixed with air in the air inlet branch pipes of the cylinders and then enters the combustion chamber to form a homogeneous mixture.

Preferably, two methanol inlets are arranged.

More preferably, the stainless steel is 06Gr19Ni10 stainless steel.

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

Preferably, the base holes are arranged in sequence according to the cylinder center distance of the engine.

The invention has the beneficial effects that:

the design meets the requirement of multi-point injection of the dual-fuel engine, and pressurized air and methanol are mixed in the air inlet branch pipes of the cylinders to form homogeneous mixed gas which then 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. In addition, through timing, quantitative and multipoint sequential injection control, the waste of engine fuel is reduced, the thermal efficiency of the engine is improved, the emission of the engine is optimized, and the method is a great step towards an environment-friendly engine.

Drawings

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

Fig. 2 is a front view of one embodiment of the present invention.

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

In the figure:

5. an electrojet valve connecting seat; 4. a temperature pressure sensor connection seat; 1. a methanol inlet; 6. an electrojet valve for methanol; 3. an intake manifold for each cylinder; 2. a methanol alcohol rail;

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.

The methanol/diesel dual-fuel engine alcohol inlet system comprises a dual-fuel engine body, wherein the dual-fuel engine body is provided with an engine air inlet pipe, and further comprises a methanol alcohol rail 2, a methanol inlet 1, air inlet branch pipes 3 of each cylinder, a temperature and pressure sensor connecting seat 4 and an electronic injection valve connecting seat 5.

The methanol-alcohol rail 2 is tubular with two closed ends, and the methanol-alcohol rail 2 is fixedly connected with an engine air inlet pipe through an alcohol rail support 3. The methanol alcohol rail 2 is designed to be tubular, and can be a square pipe or a round pipe. In order to facilitate the fixing and the connection of the branch pipes, the methanol alcohol rail 2 in this embodiment is designed as a rectangular pipe.

Meanwhile, the methanol alcohol rail 2 is made of stainless steel and is 06Gr19Ni10 stainless steel. The whole alcohol inlet system is arranged on the operation side of the engine, and the 06Gr19Ni10 stainless steel is a corrosion-resistant material, so that the practical service life can be greatly prolonged. The methanol alcohol rail 2 is disposed on the engine intake branch pipe side. The requirements of separate cylinder alcohol feeding and single cylinder control of the engine are met, and the aim of methanol sequential multipoint injection 'quasi-internal mixing' mixed combustion is fulfilled.

The head end of methyl alcohol rail 2 is equipped with methyl alcohol import 1, and in order to realize quick admit air, can set up the quantity of methyl alcohol import 1 and be two, methyl alcohol import 1 is connected with the pipe of admitting air.

In order to realize the detection of the temperature and the pressure of the methanol gas, a temperature pressure sensor connecting seat 4 is arranged at the tail part of the methanol alcohol rail 2, and a temperature pressure sensor is arranged on the temperature pressure sensor connecting seat 4. At the moment, the pressure and the temperature of the methanol gas can be detected in real time, and the gas inlet of the methanol can be controlled in time according to the pressure and the temperature.

An inlet branch pipe is provided on the methanol alcohol rail 2. The alcohol inlet branch pipe is fixedly connected and communicated with the side wall of the methanol alcohol rail 2. In order to facilitate installation and positioning, the methanol alcohol rail 2 is provided with a base hole. The base hole is arranged corresponding to the position of each cylinder according to the air inlet branch pipe 3 of each cylinder, wherein the axis of the base hole corresponds to the axis of the cylinder core of each cylinder. The alcohol inlet branch pipes are arranged in sequence according to the cylinder center distance of the engine. The alcohol inlet branch pipes of the cylinders are connected with the alcohol rails by adopting welding structures.

In order to realize the injection of the methanol gas, each cylinder intake manifold 3 is provided on the intake pipe of the engine. The number of cylinder intake branch pipes 3 is the same as the number of engine cylinders. And each cylinder air inlet branch pipe 3 is provided with an electric injection valve connecting seat 5, the electric injection valve connecting seat 5 is connected with a methanol electric injection valve 6, and the methanol electric injection valve 6 is communicated with an alcohol inlet branch pipe of the methanol alcohol rail 2.

When the controller detects that the pressure and the temperature of the methanol in the methanol alcohol rail 2 reach set values, the methanol electronic injection valve 6 is controlled according to the ignition sequence to inject the methanol at fixed time and quantity in the air inlet branch pipe of each cylinder of the engine after the exhaust valve of the engine is closed.

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, and the methanol is mixed with air in the air inlet branch pipes 3 of the cylinders and then enters the combustion chamber to form a homogeneous mixture.

In summary, the present invention is only a preferred embodiment, and 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.