On the production of CNG from coke oven gas
Thread Content
I would like to ask whether, in the current production of CNG from coke oven gas, it is pressurized and sent into the pipeline directly after methanation and dehydration, or is it purified using PSA or membrane separation before being pressurized and sent into the pipeline?
After methanation, denitrification is required before it can be fed into the pipeline network; otherwise, its calorific value will not meet the standards
After methanation, it must be passed through PSA for separation, purification, and drying.
This is mainly because COG itself is a hydrogen-rich fuel gas, with the total amount of CO + CO2 accounting for around 15%; the nitrogen content is even higher. The owner can check the composition of COG in their facility – in the methanation process, there is an excess of hydrogen, while nitrogen, being an inert gas, does not participate in the reaction. It ends up being discharged along with the desired gas from the methanation unit. In the current process of using COG to produce SNG, the final product contains about 80% methane, and in such cases carbon supplementation is necessary; typically, the methane content remains between 68-70%.
This post was last edited by luoli519 on 2016-5-4 at 16:31. Whether it is CNG produced from coke oven gas or SNG produced from coal, the resulting gas must meet specified standards before it can be put into use. Therefore, the raw gas coming out of the methanation reaction unit must be purified and upgraded to meet the required standards ； Methods for improving quality can include membrane methods, PSA methods, or wet + dry dehydration. The specific choice should be determined based on the actual project conditions and available resources. Various high-efficiency separation technologies used in different purification processes, such as the feather-leaf type high-efficiency gas-liquid separation equipment and the multi-factor swirl separator technology equipment, can be learned about by visiting the link http://bbs.hcbbs.com/thread-1354813-1-1.html on the Haichuan Chemical Industry Forum. For more information on separation technology equipment solutions, please contact professional separation technology companies directly.