CN217558436U

CN217558436U - Direct injection hybrid air inlet structure of LNG gas machine

Info

Publication number: CN217558436U
Application number: CN202221617189.5U
Authority: CN
Inventors: 张国平; 张潇依; 柯建豪; 杜康健
Original assignee: Zhejiang Keboda Industrial Co ltd
Current assignee: Zhejiang Keboda Industrial Co ltd
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2022-10-11
Anticipated expiration: 2032-06-27

Abstract

The utility model discloses a direct injection hybrid inlet structure of LNG gas machine, including the multiple spot injection module, the multiple spot injection module includes air guide, air intake manifold, blender and nozzle, air intake manifold is connected with the air guide, the blender is located among air intake manifold's the inlet channel, the nozzle is installed on the air guide and is connected with the blender, a plurality of groups the air guide of multiple spot injection module connects gradually and establishes ties and form the gas passageway, each group the nozzle of multiple spot injection module sprays the gas in the gas passageway respectively into again with send into the air in the air intake manifold of place multiple spot injection module mix with form the mist, each group the multiple spot injection module sets up with each cylinder one-to-one of gas machine, can effectively guarantee that the mist that each cylinder absorbs keeps unified and stable air-fuel ratio.

Description

Direct injection hybrid air inlet structure of LNG gas machine

[ technical field ] A method for producing a semiconductor device

The utility model relates to a gaseous internal-combustion engine's technical field, especially a technical field of direct injection hybrid air inlet structure of LNG gas engine.

[ background of the invention ]

A gas engine is a device that can generate kinetic energy by burning a combustible gas such as natural gas or hydrogen. Natural Gas-fired Gas engines can be classified into LNG (Liquefied Natural Gas) Gas engines and CNG (Compressed Natural Gas) Gas engines according to the storage method of Natural Gas. In recent years, gas engines using natural gas as a fuel have become a new focus in the fields of ships, oil field drilling power generation, mines and the like, and compared with conventional diesel engines using diesel oil as a fuel, the gas engines are low in fuel cost and more environmentally friendly (can make CO in exhaust gas be CO) ₂ The emission is reduced by about 20 percent, the CO is reduced by 97 percent, the hydrocarbon is reduced by about 72 percent, the nitrogen oxide is reduced by about 30 percent, and the lead, the sulfide, the benzene and other harmful substances are not basically contained). With the national peak carbon energy-saving and emission-reducing requirement and the shortage of world petroleum resource supply, the fuel oil is actively promotedThe gas change modification has important significance for low-carbon economy in China.

For existing natural gas fired gas engines, a manifold air intake structure as shown in fig. 1 is generally employed. Referring to fig. 1, during operation, air enters the gas manifold 8 in direction a, while the injection common rail 6 feeds natural gas into the gas manifold 8 in direction B and mixes with the air, which is then drawn into and combusted by the individual cylinders 7. However, since the distances between the air inlet of the gas manifold 8 and the outlets of the mixture gas and the distances between the natural gas inlet and the outlets of the mixture gas are different, the amounts of the air and the natural gas sucked into the cylinders 7 are different (that is, the air-fuel ratio is unstable), the combustion temperatures are different, and the cylinders 7 are prone to be subjected to cylinder jacking, cylinder pulling or cylinder explosion due to combustion imbalance. However, natural gas itself is highly required for the air-fuel ratio (natural gas: air =1 17), otherwise it is difficult to sufficiently burn. Further, natural gas has a high demand for air-fuel ratio compared to diesel oil, and has problems such as a high ignition point, a low flame propagation rate under lean conditions, unstable combustion, large cycle variation, low combustion isochoricity, and low thermal efficiency. The problems prevent oil-to-gas transformation in the fields of ships, oil field drilling power generation, mines and the like, and need to be solved urgently.

[ Utility model ] content

The utility model aims at solving the problem among the prior art, providing a direct injection hybrid air inlet structure of LNG gas machine, can effectively guarantee that the mist that each cylinder absorbs keeps unified and stable air-fuel ratio.

In order to realize the above-mentioned purpose, the utility model provides a direct injection hybrid inlet structure of LNG gas machine, including the multiple spot injection module, the multiple spot injection module includes air guide, air intake manifold, blender and nozzle, air intake manifold is connected with the air guide, the blender is located among air intake manifold's the inlet channel, the nozzle is installed on the air guide and is connected with the blender, a plurality of groups the air guide of multiple spot injection module connects gradually and establishes ties and form the gas passageway, each group the nozzle of multiple spot injection module sprays the gas in the gas passageway respectively into again with sending into the air phase mixture in the air intake manifold of place multiple spot injection module in order to form the mist, each group each multiple spot injection module sets up with each cylinder one-to-one of gas machine, each the cylinder inhales the produced mist of the multiple spot injection module that corresponds respectively automatically.

Preferably, the gas guide device comprises a supporting seat and a guide pipe, the supporting seat is sleeved outside the guide pipe and is provided with a plurality of mounting ports for fixing the nozzles, the mounting ports are respectively communicated with pipe body channels of the guide pipe, and the guide pipe of the gas guide device of the multipoint injection module is sequentially connected and enables the pipe body channels to be connected in series to form a gas channel.

Furthermore, the free end of the guide pipe positioned at one end of the gas channel is sealed by a sealing plate, and the free end of the guide pipe positioned at the other end of the gas channel is also provided with a connecting pipe.

Preferably, an air inlet channel is formed by the opposite side walls of the air inlet manifold in a penetrating way, and a notch communicated with the air inlet channel is formed in the other side wall of the air inlet manifold.

Furthermore, the mixer comprises a connecting pipe, an annular pipe and air nozzles, one end of the connecting pipe is connected with the outer wall of the annular pipe, the other end of the connecting pipe penetrates through the notch and is connected with the nozzle, so that fuel gas sprayed out from the nozzle is fed into the annular channel of the annular pipe, a plurality of air nozzles communicated with the annular channel are arranged on the inner wall and/or the outer wall of the annular pipe in a surrounding mode, and the air nozzles are respectively arranged at the air nozzles.

Furthermore, two ends of the central channel of the ring pipe are respectively over against the inlet and the outlet of the air inlet channel.

Preferably, the number of nozzles of each group of the multi-point jetting modules is at least two.

Furthermore, the number of the gas channels is at least one, and when the number of the gas channels is two or more, the gas channels are independent and not communicated with each other.

Furthermore, the number of the fuel gas channels is one, natural gas and hydrogen are simultaneously introduced into the fuel gas channels to serve as fuel gas, and the nozzles spray mixed fuel gas of the natural gas and the hydrogen.

Still further, the quantity of gas passageway is two, two the gas passageway is independent each other not intercommunication and let in natural gas and hydrogen respectively as the gas, and each group the multiple spot sprays the module and all adopts different nozzles to spray natural gas and hydrogen respectively.

Wherein the volume ratio of the natural gas is 92-98%, and the volume ratio of the hydrogen is 8-2%.

The utility model has the advantages that:

1. the utility model discloses an adopt the air guide, air intake manifold, blender and nozzle constitute the multiple spot injection module jointly, make the air guide of a plurality of groups multiple spot injection module connect gradually and establish ties and form the gas passageway, make each group multiple spot injection module and each cylinder one-to-one setting of gas machine simultaneously, can accomplish the mixture of gas and air and form the mist at the air intake manifold of each multiple spot injection module, make the mist directly absorb by the air inlet of each cylinder automatically again, can effectively guarantee that the mist that each cylinder absorbs keeps unified and stable air-fuel ratio, thereby adapt to the trend that present oil changes gas better, satisfy the needs that carbon reaches peak energy saving and emission reduction;

2. the utility model utilizes the nozzles of each group of multi-point injection modules to perform direct injection at the accurate equivalent weight at the gate of the cylinder, thereby effectively shortening the gas supply pipeline, effectively improving the efficiency of the gas entering the cylinder and performing combustion work, and achieving the purpose of instant response injection, mixing and combustion of the gas;

3. the utility model discloses a mix hydrogen among the natural gas, can utilize the characteristics that hydrogen combustion rate is fast and the limit of lean burn is wide, effectively improve the combustion rate of natural gas, on the one hand accelerate the do work of cylinder, ensure that gas machine has powerful sustainable moment of torsion and total power and realize stronger power, on the other hand also can reach better emission index;

4. the utility model discloses a set up a plurality of nozzles simultaneously on each group's multiple spot injection module, can enough utilize the control of the start-up quantity of nozzle in order to realize the regulation of gas jet velocity, can make different nozzles spray natural gas and hydrogen respectively according to required again to ensure that the proportion of natural gas and hydrogen remains stable throughout in the mixed gas.

The features and advantages of the present invention will be described in detail by embodiments with reference to the accompanying drawings.

[ description of the drawings ]

FIG. 1 is a manifold intake configuration for a prior art natural gas fired gas engine;

FIG. 2 is a perspective view of the first embodiment;

FIG. 3 is a perspective view of a multi-point injection module with a nozzle according to the first embodiment;

FIG. 4 is a perspective view of a multi-point injection module without a nozzle according to the first embodiment;

FIG. 5 is a perspective view of the air guide with adapter according to the first embodiment;

FIG. 6 is a perspective view of an intake manifold according to the first embodiment;

FIG. 7 is a perspective view of a mixer according to the first embodiment;

FIG. 8 is a schematic structural view of a gas channel according to the first embodiment;

fig. 9 is a schematic structural view of a gas passage according to the second embodiment.

In the figure: the gas mixing device comprises a gas guide device 1, a support seat 11, a mounting port 111, a guide tube 12, a tube body channel 121, a connecting tube 13, a gas inlet manifold 2, a gas inlet channel 21, a notch 22, a mixer 3, a connecting tube 31, a circular tube 32, a gas nozzle 33, a nozzle 4, a gas channel 5, a common injection rail 6, a cylinder 7 and a gas main pipe 8.

[ detailed description ] embodiments

The first embodiment is as follows:

referring to fig. 1 to 8, the utility model relates to a direct injection hybrid air inlet structure of LNG gas engine, including the multiple spot injection module, the multiple spot injection module includes air guide 1, air intake manifold 2, blender 3 and nozzle 4, air intake manifold 2 is connected with air guide 1, blender 3 is located among air intake manifold 2's inlet channel 21, nozzle 4 is installed on air guide 1 and is connected with blender 3, a plurality of groups air guide 1 of multiple spot injection module connects gradually and establishes ties and form gas channel 5, each group nozzle 4 of multiple spot injection module sprays the gas in the gas channel 5 respectively and mixes with the air that sends into in air intake manifold 2 of place multiple spot injection module again in order to form the mist among air guide 3 of place multiple spot injection module, each group each cylinder 7 of multiple spot injection module and gas engine sets up one-to-one, each cylinder 7 inhales the mist that the multiple spot injection module that corresponds produced respectively automatically.

The gas guide device 1 comprises a supporting seat 11 and a guide pipe 12, the supporting seat 11 is sleeved outside the guide pipe 12 and is provided with two mounting ports 111 for fixing the nozzle 4, the two mounting ports 111 are respectively communicated with pipe body channels 121 of the guide pipe 12, and the guide pipe 12 of the gas guide device 1 of the multipoint injection module is sequentially connected and enables the pipe body channels 121 to be connected in series to form a gas channel 5.

The free end of the guide pipe 12 at one end of the gas channel 5 is closed by a closing plate, and the free end of the guide pipe 12 at the other end of the gas channel 5 is also provided with a connecting pipe 13.

An air inlet channel 21 is formed between the two opposite side walls of the air inlet manifold 2 in a penetrating manner, and a notch 22 communicated with the air inlet channel 21 is formed in the other side wall of the air inlet manifold 2.

The mixer 3 comprises a connecting pipe 31, a circular pipe 32 and air nozzles 33, one end of the connecting pipe 31 is connected with the outer wall of the circular pipe 32, the other end of the connecting pipe passes through the gap 22 and is connected with the nozzle 4, so that the fuel gas sprayed out from the nozzle 4 is sent into the circular channel of the circular pipe 32, a plurality of air nozzles communicated with the circular channel are arranged on the inner wall and/or the outer wall of the circular pipe 32 in a surrounding manner, and the air nozzles 33 are respectively arranged at the air nozzles.

The two ends of the central passage of the loop pipe 32 are respectively opposite to the inlet and the outlet of the air inlet passage 21.

The number of nozzles 4 of each set of said multi-point spray modules is two.

The number of the gas channels 5 is one, natural gas and hydrogen are simultaneously introduced into the gas channels to serve as gas, and the nozzles 4 respectively spray mixed gas of the natural gas and the hydrogen.

The utility model discloses the working process:

during operation, natural gas and hydrogen are respectively fed into the same gas channel 5 along the directions C and D in fig. 8, and a mixed gas of natural gas and hydrogen is formed. Wherein the natural gas accounts for 95% by volume, and the hydrogen accounts for 5% by volume. Subsequently, the nozzles 4 of each set of multi-point injection modules inject the mixed gas of natural gas and hydrogen into the annular channel of the annular pipe 32 along the connecting pipe 31, and then into the intake channel of the intake manifold 2 through the respective air nozzles 33. At the same time, air is fed into the intake passages of the intake manifolds 2 of the respective sets of multi-point injection modules, respectively, to be mixed with the mixed gas of natural gas and hydrogen gas and form a mixed gas. Finally, each cylinder 7 sucks in the mixed gas generated by its corresponding multi-point injection module.

Wherein the injection speed of the mixed gas of each group of multi-point injection modules can be controlled by the starting number of the nozzles 4 of each group of multi-point injection modules. For example, when the two nozzles 4 of each group of multi-point injection modules are activated simultaneously, the high-speed injection of the mixed gas is achieved, whereas when only one of the two nozzles 4 of each group of multi-point injection modules is activated, the low-speed injection of the mixed gas is achieved.

In addition, hydrogen may be formed by on-board cracking.

The second embodiment:

referring to fig. 9, the number of the gas passages 5 is two, the two gas passages 5 are independent from each other and are not communicated with each other, and natural gas and hydrogen gas are respectively introduced as gas, and each group of the multi-point injection modules respectively adopts different nozzles 4 to respectively inject the natural gas and the hydrogen gas.

The other steps are the same as those of the first embodiment.

The utility model discloses the working process:

during operation, natural gas and hydrogen are fed into the two gas channels 5 in the directions E and F in fig. 9, respectively. Wherein the natural gas accounts for 95% of the volume, and the hydrogen accounts for 5% of the volume. Subsequently, each set of multi-point injection modules uses different nozzles 4 to inject the natural gas and the hydrogen gas into the annular channel of the annular pipe 32 along the connecting pipe 31, and then into the air inlet channel of the air inlet manifold 2 through the respective air nozzles 33. At the same time, air is fed into the intake passages of the intake manifold 2 of each set of multi-point injection modules, respectively, so that natural gas, hydrogen gas, and air are mixed and form a mixed gas. Finally, each cylinder 7 sucks in the mixed gas generated by its corresponding multi-point injection module.

The above-mentioned embodiment is right the utility model discloses an explanation, it is not right the utility model discloses a limited, any is right the utility model discloses scheme after simply changing all belongs to the protection scope of the utility model.

Claims

1. The utility model provides a direct injection hybrid air intake structure of LNG gas machine which characterized in that: the device comprises a multipoint injection module, wherein the multipoint injection module comprises an air guide device (1), an air inlet manifold (2), a mixer (3) and a nozzle (4), the air inlet manifold (2) is connected with the air guide device (1), the mixer (3) is positioned in an air inlet channel (21) of the air inlet manifold (2), the nozzle (4) is installed on the air guide device (1) and is connected with the mixer (3), a plurality of groups of air guide devices (1) of the multipoint injection module are sequentially connected and connected in series to form a gas channel (5), the nozzle (4) of the multipoint injection module is used for injecting gas in the gas channel (5) into the mixer (3) of the multipoint injection module and then mixing the gas fed into the air inlet manifold (2) of the multipoint injection module to form mixed gas, the multipoint injection module and the gas machine are arranged in a one-to-one correspondence manner, and the cylinders (7) are respectively and automatically suck the mixed gas generated by the corresponding injection module.

2. The direct-injection hybrid intake structure for an LNG gas engine as set forth in claim 1, wherein: air guide (1) includes supporting seat (11) and pipe (12), supporting seat (11) cover is established outside pipe (12) and is provided with a plurality of and supplies installing port (111) that nozzle (4) are fixed, each installing port (111) are linked together with body passageway (121) of pipe (12) respectively, each pipe (12) of air guide (1) of multipoint spraying module connect gradually and make each body passageway (121) establish ties and form gas channel (5).

3. The direct-injection hybrid intake structure of an LNG gas engine as set forth in claim 2, wherein: the free end of the guide pipe (12) positioned at one end of the gas channel (5) is sealed by a sealing plate, and the free end of the guide pipe (12) positioned at the other end of the gas channel (5) is also provided with a connecting pipe (13).

4. The direct-injection hybrid intake structure of an LNG gas engine as set forth in claim 1, wherein: and an air inlet channel (21) is formed by penetrating between the two opposite side walls of the air inlet manifold (2), and a notch (22) communicated with the air inlet channel (21) is formed in the other side wall of the air inlet manifold (2).

5. The direct-injection hybrid intake structure of an LNG gas engine as set forth in claim 4, wherein: the mixer (3) comprises a connecting pipe (31), a circular pipe (32) and air nozzles (33), one end of the connecting pipe (31) is connected with the outer wall of the circular pipe (32) while the other end of the connecting pipe passes through the notch (22) and is connected with the nozzle (4), so that fuel gas sprayed out of the nozzle (4) is fed into the circular channel of the circular pipe (32), a plurality of air nozzles communicated with the circular channel are arranged on the inner wall and/or the outer wall of the circular pipe (32) in a surrounding manner, and the air nozzles (33) are respectively arranged at the air nozzles.

6. The direct-injection hybrid intake structure of an LNG gas engine as set forth in claim 5, wherein: the two ends of the central channel of the ring pipe (32) are respectively opposite to the inlet and the outlet of the air inlet channel (21).

7. The direct-injection hybrid intake structure of an LNG gas engine as set forth in any one of claims 1 to 6, wherein: the number of nozzles (4) of each group of said multi-point jet modules is at least two.

8. The direct-injection hybrid intake structure of an LNG gas engine as set forth in claim 7, wherein: the number of the gas channels (5) is at least one, and when the number of the gas channels (5) is two or more, the gas channels (5) are independent and not communicated with each other.

9. The direct-injection hybrid intake structure for an LNG gas engine as set forth in claim 8, wherein: the number of the fuel gas channels (5) is one, natural gas and hydrogen are simultaneously introduced into the fuel gas channels to serve as fuel gas, and the nozzles (4) respectively spray mixed fuel gas of the natural gas and the hydrogen.

10. The direct-injection hybrid intake structure of an LNG gas engine as set forth in claim 8, wherein: the number of the gas channels (5) is two, the two gas channels (5) are independent of each other and are not communicated with each other and are respectively filled with natural gas and hydrogen to serve as gas, and each group of the multi-point injection modules respectively adopt different nozzles (4) to respectively inject the natural gas and the hydrogen.