Brief introduction
Each year, China emits nearly 20 billion m3 of methane (pure) into the atmosphere in its coal production, accounting for more than 35 percent of the total amount of methane emitted in the world from this source. And the utilization rate is less than 10 percent, meaning a massive amount of waste of resources and production of greenhouse gases. Moreover, China’s natural gas output is far from sufficient to meet demand, resulting in increased LNG and natural gas imports in recent years.
The explosive nature of coal-mine gas (CBM) restricts its comprehensive utilization, and, deoxidation of CBM causes a technical bottleneck.
This technology solves the problem of deoxidation of oxygen-bearing CBM and contains a complete set of technology for the production of CNG/LNG through the deoxidation of coal-mine gas-methane concentration-compression/liquefaction. The ‘non-catalytic combustion deoxidation of coal-mine gas for production of methanol’, ‘catalytic combustion deoxidation and method of coal-mine gas for production of methanol’, ‘low-temperature separation of CBM and concentration of methane’, and the ‘sulfur-tolerant catalytic deoxidation of methane-rich gas’ processes have all been patented.
Technical features
1.The deoxidation catalysts have good sulfur tolerance and heat resistance
The advantages of developed non-noble metal, sulfur-tolerant deoxidation catalysts for deoxidation of coal mine gas are their sulfur tolerance, heat resistance, deep deoxidation, and low treatment costs.
2.The technology is both advanced and mature.
The process is simple, safe, and environmentally friendly, and is highly automated, with low energy consumption. The technology is advanced, mature and reliable.
3.This process can be used for treating coal mine gas of various scales.
It has the complete technology for the production of CNG or LNG through deoxidation of coal-mine gas–purification and enrichment of methane. It can be applied for skid-mounted layout and be used for treating coal-mine gas of various scales.
4.Widely applicable
This process is suitable for treating oxygen-bearing CBM with a 4~13 percent (v/v) oxygen content and fits the gas drainage features of Chinese coal mines. It can also be applied to the recovery and treatment of landfill gas and other methane-rich gases across a broad range.
Technical indicators
The deoxidation rate of an industrial unit is no more than 0.2 percent (v/v), and the CNG meets the national GB 18047-2000 standard, while the LNG meets the European EN 1160-1996 standard.