Biogas to CNG/LNG Plant

Biogas to CNG/LNG Description

Through a series of purification treatments such as desulfurization, decarbonization and dehydration of biogas, clean and pollution-free natural gas can be produced, which greatly increases its combustion calorific value. Decarbonized tail gas can also produce liquid carbon dioxide, so that biogas can be fully and effectively used, and will not produce secondary pollution.

According to the requirements of the final product, natural gas can be produced from biogas, which can be directly transported to the natural gas pipe network as civil gas; Or CNG (compressed natural gas for vehicles) can be made as vehicle fuel by compressing natural gas to 20 ~ 25MPa; It is also possible to cryogenically liquefy the product gas and eventually produce LNG (liquefied natural gas).

The process of biogas to CNG is actually a series of purification processes and the final pressurization process.
1. High sulfur content will corrode equipment and pipes and reduce their service life;
2. The higher the amount of CO₂, the lower the calorific value of gas;
3. Since biogas is produced in an anaerobic environment, the O₂ content will not exceed the standard, but it should be noted that the O₂ content shall not be higher than 0.5% after purification.
4. In the process of natural gas pipeline transportation, water condenses into liquid at low temperature, which will reduce the cross-sectional area of the pipeline, increase the resistance and energy consumption in the transportation process, and even freeze and block the pipeline; In addition, the presence of water will accelerate the corrosion of sulfide on equipment.

According to the relevant parameters of raw biogas and the analysis of product requirements, raw biogas can be successively desulfurization, pressurization drying, decarbonization, CNG pressurization and other processes, and the product can be obtained: compressed CNG for vehicle.

Technical feature