The recovery methods of coalbed methane mainly include the following:
1. Conventional recycling methods
Ground drilling and extraction
Extracting coalbed methane through surface drilling before or after coal mining. This method is suitable for areas with abundant coalbed methane resources and can effectively improve the recovery rate of coalbed methane.
Underground drilling and extraction
In the process of coal mine production, underground drilling technology is used to extract coalbed methane. This method can recover coalbed methane in real time and reduce the emission of coalbed methane into the atmosphere.
Extraction from goaf
After mining on the working face, coalbed methane released from the goaf is extracted through surface goaf wells or underground boreholes. This method is applicable to the goaf after coal mining, which helps to reduce the emission of coalbed methane and recover resources.
2. Enhance recycling technology
Gas injection method
Inject carbon dioxide or nitrogen into unmineable deep coal seams for storage, while extracting and recovering the methane contained in the coal seams. This method can improve the recovery rate of coalbed methane and help reduce greenhouse gas emissions.
Membrane separation technology
The use of membrane separation technology to process vented natural gas can effectively reduce the dew point temperature of recovered natural gas hydrocarbons and improve the recovery rate of heavy hydrocarbons. This method is suitable for situations where coalbed methane contains high heavy hydrocarbon components.
3. Safe recycling and purification methods
Nitrogen dilution oxygen explosion-proof operation
Inject a predetermined amount of nitrogen by-product gas into oxygen-containing coalbed methane to reduce oxygen concentration and improve the safety of methane recovery process. This method is suitable for the recovery of oxygen-containing coalbed methane and helps prevent explosion accidents from occurring.
Vacuum pressure swing adsorption process
The vacuum pressure swing adsorption process is used to recover and enrich methane from nitrogen doped oxygen-containing coalbed methane, resulting in methane enriched gas with low oxygen content. Subsequently, the moving bed adsorption process was further concentrated and purified through pressure gradient simulation, resulting in high-purity methane product gas and nitrogen by-product gas. This method can recover and purify low concentration methane in oxygen-containing coalbed methane under safe conditions.
4. Comprehensive utilization method
Power generation, power, heating
Using recycled coalbed methane for power generation, power or heating can achieve effective utilization of resources and reduce environmental pollution. For example, coalbed methane can be fed into gas turbines or internal combustion engines for combustion and power generation, or used for heating industrial boilers.
Torch or flameless oxidation decomposition
Eliminate coalbed methane that cannot be directly utilized through flare or flameless oxidation devices to reduce atmospheric pollution. This method is suitable for situations where coalbed methane is small or cannot be directly recovered and utilized.
In summary, there are various methods for recovering coalbed methane, and the appropriate recovery method should be selected based on specific coalbed methane resource conditions, mining conditions, and market demand. At the same time, attention should be paid to technological innovation and application to improve the recovery rate and utilization efficiency of coalbed methane.
The Coalbed Methane Recovery Compressor plays a crucial role in coalbed methane recovery. The following are the specific roles of coalbed methane recovery compressors in coalbed methane recovery:
1. Extraction and Collection
The coalbed methane recovery compressor compresses coalbed methane through its internal mechanical structure, such as pistons, screws, or centrifugal impellers, thereby reducing the volume of gas and increasing its pressure. During this process, the compressor can effectively extract and collect coalbed methane from drilling, ensuring that coalbed methane can be efficiently recovered and utilized.
2. Increase gas pressure
Coalbed methane is often in a low pressure state during the mining process, which is not conducive to its subsequent transportation and utilization. The coalbed methane recovery compressor increases the pressure of coalbed methane to the required level through compression, thereby enabling it to meet the requirements of subsequent processes or equipment.
3. Ensure safe production
In the process of coalbed methane recovery, compressors can also play a role in ensuring safe production. For example, by diluting oxygen with nitrogen for explosion-proof operation, the compressor can reduce the oxygen concentration in coalbed methane, thereby preventing safety accidents such as explosions during the recovery process.
4. Improve recycling efficiency
The efficient operation of coalbed methane recovery compressors can significantly improve the recovery efficiency of coalbed methane. By optimizing the design and operating parameters of the compressor, it can better adapt to the characteristics and recovery needs of coalbed methane, thereby achieving higher recovery rates and better economic benefits.
5. Promote resource utilization
As an important energy resource, the recovery and utilization of coalbed methane are of great significance for promoting sustainable energy development. The coalbed methane recovery compressor provides strong support for the further utilization of coalbed methane through efficient and safe recovery methods. For example, recycled coalbed methane can be used in fields such as power generation and heating, thereby achieving diversified utilization of resources.
In summary, the coalbed methane recovery compressor plays a crucial role in coalbed methane recovery. Through its functions of extraction and collection, increasing gas pressure, ensuring safe production, improving recovery efficiency, and promoting resource utilization, coalbed methane recovery compressors provide strong support for the effective recovery and utilization of coalbed methane.
