The function and working principle of large natural gas compressor

Brief introduction of large natural gas compressor

As a common compressor equipment in natural gas production process, large natural gas compressor has higher exhaust pressure and flow than ordinary natural gas compressor.

The role of large natural gas compressor

Natural gas is a failure of oil production, there will be a natural gas in the casing, if the pressure is high, affects the oil production, the original is direct vent, a is the environmental pollution, the second is the waste of energy, so now the use of large gas compressor pressure recovery, is not only beneficial to oil production, protect the environment, is also a good measure of economic benefit maximization. The main components of the gas are methane, ethane and carbon three and four gases, there will be hydrogen sulfide and water mixed in them, the composition is more miscellaneous. Before entering a large natural gas compressor, it is generally necessary to carry out purification treatment to remove impurities and liquid free water. Then according to the different needs of users to increase the different pressure levels.

The application field of large natural gas compressor
Large natural gas compressors are widely used in gas lift production, pressurized gathering and transportation, gas drilling, pipeline pressurization, gas storage and injection, coalbed methane mining, LNG projects, refining and other fields, like many domestic oil fields will use large natural gas compressors. Working principle of large natural gas compressor When the compressor is running, the motor drives the crankshaft to rotate and the piston to reciprocate through the connecting rod. The crankshaft rotates a week, the piston reciprocates once, and the cylinder successively realizes the process of suction, compression and exhaust, that is, to complete a working cycle.

(1) Suction process when the piston moves to the left, the working volume of the cylinder gradually increases and the pressure gradually decreases. When the pressure drops to slightly lower than the pressure in the intake pipe, the gas in the intake pipe will open the suction valve into the cylinder, until the piston reaches the most left position (also known as the inner dead center), the working volume is the largest, the suction valve began to close.

(2) Compression process when the piston moves to the right, the working volume of the cylinder shrinks, and the gas pressure gradually increases. Because the suction valve has a check effect, the gas in the cylinder can not flow back into the intake pipe. At the same time, because the gas pressure in the exhaust pipe is higher than the pressure inside the cylinder, the gas in the cylinder can not flow out of the exhaust valve, and the gas in the exhaust pipe can not enter the cylinder because of the check effect of the exhaust valve. At this point, the amount of gas in the cylinder remains constant, and as the piston moves to the right, the gas pressure increases.

(3) Exhaust process when the piston moves right to a certain position, the gas pressure in the cylinder rises to slightly higher than the gas pressure in the exhaust pipe, and the gas opens the exhaust valve into the exhaust pipe until the piston moves to the most right position (also known as the outer dead center). The exhaust valve closes, the piston moves left again, and the process repeats.