CN212454656U

CN212454656U - Gas engine's admission line

Info

Publication number: CN212454656U
Application number: CN202020965058.0U
Authority: CN
Inventors: 龚箭; 茆文军
Original assignee: Xinjiang Maya Electric Power Technology Co ltd
Current assignee: Xinjiang Maya Electric Power Technology Co ltd
Priority date: 2020-06-01
Filing date: 2020-06-01
Publication date: 2021-02-02
Anticipated expiration: 2030-06-01

Abstract

The utility model discloses an air inlet pipeline of a gas engine, which particularly comprises an air inlet pipe, an air inlet connecting pipe, a mixer, an air inlet pipe explosion-proof valve, an explosion-proof valve connecting pipe, a gasket and a mounting bolt, wherein the air inlet pipe and the air inlet connecting pipe are linearly connected to realize the shortest length; the mixer is close to the intercooler outlet; the inner diameters of the air inlet pipe and the air inlet connecting pipe are increased; the air inlet pipe and the cylinder cover are sealed by adopting a non-asbestos gasket. The utility model reduces the resistance of the air entering each cylinder after supercharging, reduces the air inlet resistance to the minimum, and improves the air pressure; the utility model discloses guaranteed that compressed air has enough premixing time with the natural gas to satisfy the abundant burning of engine.

Description

Gas engine's admission line

Technical Field

The utility model belongs to gas engine application improves the field, concretely relates to gas engine's admission line.

Background

The basic working principle of the electric control gas system of the LNG natural gas engine is as follows:

the liquefied natural gas is vaporized from the gas storage tank by the vaporizer, the liquefied natural gas needs to absorb large heat due to volume expansion in the vaporization process, and engine coolant needs to be led out of the vaporizer to heat the gas in order to prevent the vaporizer from freezing. The vaporized natural gas enters a pressure stabilizer (a pressure regulator), and the pressure stabilizer stabilizes the high-pressure gas at 4-6 bar so as to meet the normal working requirement. The stabilized gas passes through a low-pressure filter and a low-pressure fuel cut-off valve and finally reaches a gas injection component. In order to ensure the stability of fuel supply and pressure and avoid the phenomenon that the performance of a large-scale engine is influenced by the pressure fluctuation of fuel in the process of rapid acceleration of the large-scale engine, a buffer is added between a voltage stabilizer and a low-pressure filter in a fuel supply system of the large-scale engine. The function of the gas injection component is to accurately control the natural gas supply according to the running condition of the engine. The natural gas and the air are fully mixed in the mixer and enter an engine cylinder, the spark plug is ignited for combustion, the ignition time of the spark plug is controlled by the ECU, the oxygen sensor monitors the oxygen concentration of the combusted tail gas in real time, the air-fuel ratio is calculated, and the ECU corrects the natural gas supply quantity in time according to the feedback signal of the oxygen sensor.

The common gas engine for medium-voltage series power generation in the market can cause engine faults such as piston top melting, engine cylinder pulling and the like when the gas engine runs under overload and overspeed for a long time (due to the nature of gas power generation). The engine cylinder pulling and piston top melting are caused by various reasons: (1) the piston top carbon deposit is serious, (2) the fuel oil supply is poor, (3) the fuel oil supply is uneven, (4) the fuel spray nozzle works badly (the fuel spray pressure is too small, the atomization is poor, the spray cone angle is not right), (5) the compressed air and the natural gas are mixed unevenly and the combustion is not sufficient, (6) the engine lubrication is poor, (7) the engine water temperature is too high, and the like.

The gas engine for medium-pressure series power generation in actual use is found in troubleshooting, and the main reason is caused by uneven mixing and insufficient combustion of compressed air and natural gas.

SUMMERY OF THE UTILITY MODEL

The disadvantages of the background art are addressed. The utility model discloses improve the admission line, provide a gas engine's admission line.

An air inlet pipe of a gas engine is characterized in that an air inlet connecting pipe, an air inlet pipe and a mixer are sequentially connected, and an explosion-proof valve of the air inlet pipe and an explosion-proof valve connecting pipe are arranged on the air inlet pipe through mounting bolts; the air inlet pipe and the air inlet connecting pipe are linearly connected to realize the shortest length; the mixer is close to the intercooler outlet; the inner diameters of the air inlet pipe and the air inlet connecting pipe are increased compared with the inner diameters of the air inlet pipe and the air inlet connecting pipe in a common model; the air inlet pipe and the cylinder cover are sealed by adopting a non-asbestos gasket.

Further, the air inlet pipe is made of cast aluminum.

Preferably, the inner diameter of the air inlet pipe is phi 85-phi 95mm, the outer diameter is phi 95-phi 105mm, and the length is 1000 mm.

The utility model has the advantages of:

the utility model discloses increase the intake pipe and admit air and take over the internal diameter, reduced the resistance of each jar of pressure boost back air admission, reduced the resistance of admitting air to minimum, improved the pressure of air. The natural gas and supercharged air junction point moves forwards in the direction of the intercooler, so that the compressed air and the natural gas have enough premixing time, the engine can be fully combusted, the phenomena that the mixed gas is not uniformly premixed, the 1 # cylinder and the 2 # cylinder which are close to the outlet of a gas main pipe can explode and knock when running, and the top of the piston is abnormally high to cause the top melting accident of the piston can be avoided.

Drawings

Fig. 1 is a functional structure diagram of the intake duct of the gas engine of the present invention.

Fig. 2 is a functional structure diagram of an old intake duct before modification.

In the drawings, the numbers are explained as follows: 1. an ignition coil; 2. an air inlet pipe; 3. an air inlet connecting pipe; 4. a mixer; 5. a gas injection component; 6. an explosion-proof valve of the air inlet pipe; 7. a centrifugal oil-gas separator; 8. a starter; 9. an intercooler component; 10. an electronic throttle valve; an ECU.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The utility model discloses a gas engine's admission line is shown in figure 1, including intake pipe 2, admit air and take over 3, blender 4, the explosion-proof valve 6 of intake pipe, explosion-proof valve takeover, gasket and construction bolt etc. (the effect of admission line is that each working cylinder of engine is provided with fresh, clean, air behind the pressure boost). The air inlet pipe 2 and the air inlet connecting pipe 3 are linearly connected to realize the shortest length; the mixer 4 is close to the outlet of the intercooler 9; the inner diameters of the air inlet pipe 2 and the air inlet connecting pipe 3 are increased; the air inlet pipe 2 and the cylinder cover are sealed by adopting a non-asbestos gasket.

Further, the air inlet pipe 2 is made of cast aluminum.

The air inlet pipe of the old air inlet pipeline before improvement is a U-shaped bent pipe (taking Yulin YC6TD medium-pressure series gas engine for power generation as an example, as shown in figure 2), the inner diameter is phi 85mm, and the outer diameter is phi 95 mm. The length is 1300 mm. The modified air inlet pipe is changed into a straight pipe, and the inner diameter is phi 85-phi 95mm and gradually changed. The outer diameter phi of 95mm to 105mm is gradually changed. The length becomes 1000 mm.

The air inlet connecting pipe before modification is a combination of a square-circle reducer pipe and a square pipe, and the air inlet connecting pipe is changed into a special-shaped non-standard square-circle pipe which is directly communicated with an air inlet interface of the engine (the inner diameter of a square opening is 80 mm. 140 mm).

Through implementing above-mentioned mode transformation, reduce the resistance that the air got into each jar after the pressure boost, reduce the resistance of admitting air to minimum. The pressure of the air is increased.

And moving the junction of the natural gas and the supercharged air forward towards the intercooler. The junction of the natural gas and the pressurized air of the original system is arranged at the joint of the air inlet connecting pipe and the air inlet pipe. The junction of the reformed natural gas and the supercharged air is arranged at the junction of the air inlet connecting pipe and the intercooler. The compressed air and the natural gas have enough premixing time, so that the engine can be fully combusted, the phenomena that the mixed gas is not uniformly premixed, and the number 1 cylinder and the number 2 cylinder which are close to the outlet of a gas main pipe are subjected to deflagration and detonation during operation, and the top of the piston is subjected to abnormal high temperature to cause the top melting accident of the piston are avoided.

After the transformation and operation are carried out for a year, faults such as piston top melting, engine cylinder pulling and the like do not occur to the gas generator, and the drill jamming accident caused by the faults of the gas generator in the application background of petroleum drilling of the company is avoided.

Claims

1. The air inlet pipeline of the gas engine is characterized in that an air inlet connecting pipe (3), an air inlet pipe (2) and a mixer (4) are sequentially connected, and an air inlet pipe explosion-proof valve (6) and the explosion-proof valve connecting pipe are installed on the air inlet pipe (2) through mounting bolts; the air inlet pipe (2) and the air inlet connecting pipe (3) are connected in a straight line to realize the shortest length;

the mixer (4) is close to the outlet of the intercooler (9);

the air inlet pipe (2) and the cylinder cover are sealed by a non-asbestos gasket.

2. An air intake duct of a gas engine according to claim 1, characterized in that the air intake duct (2) is a cast aluminum part.

3. The intake duct of a gas engine according to claim 1, characterized in that the intake duct (2) has an inner diameter of Φ 85- Φ 95mm, an outer diameter of Φ 95- Φ 105mm and a length of 1000 mm.