What Is The Function of Natural Gas Compressor?

What is the function of natural gas compressor?

The main function of a natural gas compressor is to compress natural gas into high-pressure gas for convenient storage and transportation.

The working principle of a natural gas compressor is to compress natural gas to a pressure higher than the outlet pressure through internal mechanical devices. This process involves the rotation of the crankshaft of the compression device, and through the transmission of the connecting rod, the piston undergoes reciprocating cyclic motion, thereby causing periodic changes in the working volume of the cylinder in the natural gas compressor. When the piston starts moving from the cylinder head, the working volume inside the cylinder increases, and after the intake valve is pushed open, natural gas enters the cylinder. Subsequently, when the piston moves in the opposite direction, the cylinder volume decreases, the gas remains unchanged, and the air pressure increases accordingly. When the compressor pressure reaches a certain height, the exhaust valve opens and the gas is discharged from the cylinder. This cycle process allows the natural gas compressor piston to cycle back and forth once, allowing the gas to complete the entire process of intake, compression, and exhaust.

The application fields of natural gas compressors are very extensive, mainly including natural gas storage tanks, gas pipelines, CNG refueling stations, LNG stations, etc. These fields require the use of natural gas compressors to compress natural gas for storage and transportation. In addition, natural gas, as a green energy source, has high usage requirements, especially in terms of transportation and safety. The use of natural gas compressors has improved these issues to a certain extent. By increasing the pressure on the gas, it exists in liquid form, making it easier to transport and use.

The principle and structure of natural gas compressors

When the natural gas compressor is running, the electric motor drives the crankshaft to rotate, and the piston moves back and forth through the connecting rod. The crankshaft rotates once, and the piston moves back and forth once. The cylinder sequentially completes the process of suction, compression, and exhaust, completing a working cycle.

1. Working principle

The main feature of natural gas compressors is that they do not need to fill the cylinder with oil to obtain clean compressed gas. When the soft start device is turned on, the motor enters normal operation mode, and the compressor crankshaft is driven by a coupling. The piston and crosshead are used to make the piston move back and forth in the cylinder.

When the piston begins to move from the inner dead center, the outer side of the piston in the cylinder is in a low-pressure state, and gas enters the cylinder through the intake valve. When the piston moves from the inner dead center to the outer dead center, the intake valve closes, and the gas in the cylinder is compressed to increase pressure. When the pressure exceeds the external air pressure of the exhaust valve, the exhaust valve opens and begins to discharge compressed gas.

When the piston reaches the outer dead center, the exhaust is completed and the working cycle is completed. When the piston moves back and forth repeatedly, the compressed gas is continuously discharged. This machine is a double acting type. The inside and outside of the piston work simultaneously. External air intake, with compression and exhaust on the inner side, compression and exhaust on the outer side, and air intake on the inner side.

2. Machine sealing measures

This machine refers to the API standard for using double gauge sealing intermediates, and the letter of this machine is designed to use a sealed chamber throttling seal composed of filled Teflon flat sealing rings. Considering that the compressed medium is an extremely flammable and explosive gas, it should be hollow in the middle of the sealed chamber.

Users can consider introducing nitrogen gas with a pressure range of 0.35 to 0.5MPa for pressure sealing, thereby improving the sealing effect and extending the filling component. Business cycle. After a period of operation, the flow sealing effect of the flat sealing part will be relatively reduced.

When the nitrogen introduced between the four sealing chambers cannot balance with the diarrhea medium, nitrogen filling sealing will lose its practical significance. Users can now directly leak the leaked medium to the compressor inlet, which can be directly used to collect the leakage of letters.

3. Compressor automatic valve

This type of compressor is designed to use corrosion-resistant valve discs made of polyether ether ketone or filled nylon non-metallic valves. Valve type has a small elastic modulus and strong impact resistance; Low hardness, easy wear of valve seats, good sealing performance; Reduce noise and power consumption; This utility model is particularly suitable for compressed gases that are concerned about valve plate sparks.

4. aided design

The device is installed on a common base and comes with a complete set of anchor bolts, nuts, and washers. Each level has one exhaust safety valve. The gas pipeline system includes all pipes and valves, fittings, flanges, bolts, nuts, washers, etc. between the corresponding front flange and the outlet gas supply flange of the after cooler.

BaiLian is a professional factory for oil-free gas compressors,

Our products include more than 30 types of gas chemical compressors, including oil free lubrication air compressors, oxygen compressors, nitrogen compressors, hydrogen compressors, carbon dioxide compressors, helium compressors, argon compressors, sulfur hexafluoride compressors, etc., with a maximum pressure of up to 70Mpa.