There are mainly the following types of Biogas Compressors:
Reciprocating biogas compressor
Working principle: The piston is driven to reciprocate in the cylinder by the crankshaft, so that the working volume changes periodically, completing the four processes of suction, compression, exhaust and expansion, thereby compressing the biogas into high-pressure gas.
Features: Wide pressure range, different pressure levels can be designed according to demand; strong adaptability to biogas, can handle biogas containing impurities and high humidity; relatively small exhaust volume, suitable for small and medium-sized biogas compression scenarios.
Application scenario: Widely used in various biogas pools and long-distance biogas transportation, more common in small biogas projects, farm biogas pools and other scenarios, such as the VW-5/0.1-10 biogas compressor of Bengbu Chengpeng Compressor Co., Ltd.
Screw biogas compressor
Working principle: The intermeshing male and female screws rotate to continuously change the volume between the teeth to achieve the suction, compression and discharge of biogas.
Features: It has the advantages of high efficiency, low noise and low vibration; few moving parts, small maintenance workload, high reliability and long continuous operation time; it can maintain high efficiency in a wide range of working conditions; it has strong adaptability to gas and can transport liquid gas, dust-containing gas, etc.
Application scenarios: It is suitable for biogas purification biogas projects in urban sewage, industrial wastewater, landfill, large-scale farms, etc., such as Dongguan Yadiqin's variable frequency biogas screw compressor.
Centrifugal biogas compressor
Working principle: Rely on the high-speed rotating impeller to work on the biogas, so that the biogas obtains kinetic energy and pressure energy, thereby achieving compression.
Features: simple structure, stable operation, easy maintenance; large exhaust volume, suitable for large-scale biogas compression; high speed and relatively small volume. However, centrifugal compressors have high requirements for the cleanliness of biogas, and have low efficiency under low flow and high pressure ratio.
Application scenarios: It is often used in large-scale biogas projects, biogas power generation projects and other occasions with large requirements for biogas processing volume.
Diaphragm biogas compressor
Working principle: The volume of the air cavity is changed by the reciprocating motion of the diaphragm, thereby achieving compression of biogas. The diaphragm separates the compression chamber from the drive mechanism, avoiding contact between biogas and media such as lubricating oil.
Features: It has good sealing performance and can effectively prevent biogas leakage; it will not pollute biogas during the compression process, and is suitable for occasions with high gas purity requirements; it runs smoothly and has low noise. However, the exhaust volume of the diaphragm compressor is relatively small, and the performance of the diaphragm material has a great influence on the working efficiency and life of the compressor.
Application scenarios: It has certain applications in some scientific research, medical and other fields with strict requirements on biogas purity, as well as small high-purity biogas preparation projects.
Roots biogas compressor
Working principle: Two 8-shaped rotors are used to rotate relative to each other in the shell, and a certain gap is maintained between the rotors and the rotors, and the rotors and the shell, without contacting each other. The biogas is pushed from the air intake to the exhaust port through the rotation of the rotors to achieve gas transportation and compression.
Features: simple structure, easy maintenance; good performance under low pressure and high flow conditions; able to maintain stable flow within a wide pressure range. However, the efficiency of Roots compressors is relatively low, and the power consumption increases rapidly with the increase of pressure.
Application scenarios: suitable for occasions where the biogas pressure requirement is not high but a large flow rate is required, such as biogas collection, primary boosting and other links.
The approximate price range of various biogas compressors and examples of some product prices
Reciprocating biogas compressors
Price range: Generally, the price of small reciprocating biogas compressors is less than 10,000 yuan, such as the model ZW-0.23/3-15 of Bengbu Aiot, with a starting price of 9,888 yuan for 2 units. The price of medium-sized and slightly larger processing volume may be around 50,000-120,000 yuan, such as the D-type water-cooled biogas compressor LW-15.6/9 of Liangshan Xinghao Trading, with a starting price of 51,000 yuan. The price of large or high pressure grades may be higher.
Screw biogas compressor
Price range: The price of a small screw biogas compressor may be 30,000-40,000 yuan, such as the price of a 7.5KW permanent magnet variable frequency screw air compressor is 3,900 yuan. The price of medium and large screw biogas compressors is usually around 100,000 yuan or more, such as the screw compressor of Anshan Libang Compressor, which has a starting price of 96,000 yuan.
Centrifugal biogas compressor
Price range: Centrifugal biogas compressors are relatively expensive because they are suitable for large-scale biogas treatment. Generally, small ones may be more than 100,000 yuan, medium ones may be around 200,000-500,000 yuan, and large ones may be even higher. The specific price depends on parameters such as flow rate and pressure.
Diaphragm biogas compressor
Price range: The price of diaphragm biogas compressors is greatly affected by factors such as brand and specifications. Generally speaking, the price of small diaphragm biogas compressors may be around 50,000-100,000 yuan, and medium and large or high-tech ones may be 100,000-500,000 yuan or even higher.
Roots-type biogas compressor
Price range: The cheaper Roots-type biogas compressor may be less than 1,000 yuan, such as the price of a three-leaf Roots blower used for biogas boosting is as low as 475 yuan. The price of commonly used Roots-type biogas compressors is around 2,000-30,000 yuan, such as the price of Robuschi Roots blower ES55 is 26,800 yuan.
