Biogas Compressors play a vital role in the power generation, heating, purification and other industries using biogas, as follows:
Biogas power generation industry
Increasing pressure to meet power generation needs: Biogas generators usually require a certain pressure of biogas to operate normally. Biogas compressors can increase the pressure of low-pressure biogas generated by biogas tanks to the level required by the generator. Generally, the biogas pressure should be increased from several kilopascals to tens of kilopascals or even higher to ensure stable air intake of the generator and provide power for power generation.
Stable gas supply to ensure power generation quality: It can ensure the stability of biogas flow and pressure, make the combustion process of the generator more uniform and stable, reduce power fluctuations and voltage instability, improve power generation efficiency and power quality, and extend the service life of the generator.
Improve biogas collection efficiency: In large-scale biogas power generation projects, biogas tanks may be distributed in a large area. Biogas compressors can overcome pipeline resistance, efficiently collect and transport dispersed biogas to power generation equipment, and improve biogas collection and utilization efficiency.
Biogas heating industry
Realize long-distance transportation: After biogas is pressurized, it can be transported over long distances in the heating network to meet the heating needs of different users. Biogas can be transported from the biogas tank to the heating area several kilometers away, expanding the scope of biogas heating.
Meet the pressure requirements of heating equipment: Different heating equipment such as biogas boilers and biogas water heaters have different requirements for biogas pressure. Biogas compressors can adjust the pressure according to equipment requirements to ensure the normal operation of heating equipment and provide users with stable heat.
Adjust the heating load: According to the changes in heating demand, by adjusting the operating parameters of the biogas compressor, the flow and pressure of biogas can be flexibly adjusted to achieve precise control of the heating load and achieve energy saving and comfortable heating.
Biogas purification industry
Provide power for the purification process: In the process of biogas purification of biogas, biogas needs to be compressed to a certain pressure to meet the requirements of purification processes such as adsorption and membrane separation. Generally, the biogas pressure needs to be increased to tens of bars or even higher, so that impurities such as carbon dioxide and hydrogen sulfide in the biogas can be more easily removed.
Improve purification efficiency and purity: Stable compression pressure and flow rate help to ensure stable process conditions in the purification equipment, make the purification process more efficient, improve the purity and quality of biogas, and make it meet the standards of pipeline natural gas or vehicle natural gas.
Optimize system operation: Reasonable configuration of biogas compressor can optimize the operation of the entire biogas purification system, reduce energy consumption, improve the economy and reliability of the system, and reduce equipment investment and operating costs.
Biogas transportation industry
Compressed biogas is easy to transport: compressing biogas to a high pressure state greatly reduces its volume, making it easy to transport long distances through pipelines, tank trucks, etc., improving the transportation efficiency and economy of biogas, and realizing the optimal configuration of biogas resources.
Ensure transportation safety: During the compression process, the biogas is dried, purified and pre-treated to remove moisture, impurities, etc., reducing the safety risk of biogas during transportation. At the same time, the risk of biogas leakage under high pressure is relatively low, which improves the safety of transportation.
Biogas compressors mainly include reciprocating, screw, Roots and diaphragm types, and their working principles have their own characteristics, as follows:
Reciprocating biogas compressor
Intake process: When the piston moves from left to right in the cylinder, the cylinder volume increases and the pressure decreases. When the pressure is lower than the pressure in the intake pipe, the intake valve opens, and the biogas enters the cylinder under the action of the pressure difference until the piston moves to the rightmost end, and the intake process ends.
Compression process: The piston moves from right to left, the cylinder volume gradually decreases, the biogas is compressed, the pressure and temperature increase, and the intake valve closes until the piston moves to the leftmost end, and the compression process ends.
Exhaust process: When the biogas pressure in the cylinder is higher than the pressure in the exhaust pipe, the exhaust valve opens, and the compressed biogas is discharged from the cylinder and enters the exhaust pipeline until the piston moves to the rightmost end again, and the exhaust process ends, and so on.
Screw-type biogas compressor
Intake process: A pair of intermeshing yin and yang rotors rotate in the casing. At the intake end, the tooth slots of the rotor gradually open to form a certain space. Biogas enters the tooth slot space under the action of atmospheric pressure or intake pressure. As the rotor rotates, biogas is continuously inhaled.
Compression process: The rotor continues to rotate, and the biogas in the tooth slot moves toward the exhaust end as the rotor rotates. During the movement, the volume of the tooth slot gradually decreases, the biogas is compressed, and the pressure and temperature gradually increase.
Exhaust process: When the biogas in the tooth slot is compressed to a certain pressure, it reaches the exhaust end. At this time, the exhaust port opens, and the biogas is discharged from the compressor under pressure and enters the exhaust pipe.
Roots-type biogas compressor
Intake process: The two impellers of the Roots compressor rotate synchronously in the opposite direction in the casing. When the impeller rotates to a certain position, the space between the air inlet and the impeller gradually increases, forming a negative pressure. Biogas enters the casing under the action of external pressure. As the impeller continues to rotate, biogas is gradually inhaled.
Compression and delivery process: The two impellers mesh with each other, enclosing the inhaled biogas in the space formed by the impeller and the casing. As the impeller rotates, this enclosed space continuously moves toward the exhaust port. During the movement, the volume of the biogas remains basically unchanged, but because the pressure at the exhaust port is higher than that at the intake port, the biogas is forced to be transported to the exhaust port.
Exhaust process: When the enclosed space moves to communicate with the exhaust port, the biogas is discharged from the compressor under the action of the pressure difference and enters the exhaust pipe.
Diaphragm biogas compressor
Inhalation process: When the drive mechanism drives the diaphragm to move away from the cylinder head, the volume in the cylinder increases and the pressure decreases. When the pressure is lower than the intake pressure, the intake valve opens, and the biogas enters the cylinder to fill the space formed by the movement of the diaphragm.
Compression process: The drive mechanism pushes the diaphragm to move toward the cylinder head, the volume in the cylinder decreases, the biogas is compressed, the pressure increases, and the intake valve closes. Due to the isolation effect of the diaphragm, the biogas will not contact the drive mechanism and other components.
Exhaust process: When the biogas pressure in the cylinder rises to a level higher than the exhaust pressure, the exhaust valve opens and the compressed biogas is discharged from the cylinder and enters the exhaust pipe. The diaphragm continues to reciprocate, achieving a continuous process of suction, compression and exhaust.
