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Selection and usage methods of high-pressure plunger pumps in the field of coal seam water injection and precautions

1. Selection of high-pressure plunger pumps

1. Pressure requirements:

- Coal seam water injection usually requires a higher injection pressure, generally in the range of 10-30 MPa, and the specific pressure needs to be determined based on the depth of the coal seam, permeability, and injection targets.

- When selecting a high-pressure plunger pump, ensure that its rated pressure can meet the injection pressure requirements and leave a certain margin.

2. Flow requirements:

- The injection flow rate needs to be calculated based on the area of the coal seam, injection speed, and injection time, with a typical flow range of 100-600 L/min.

- When selecting a pump, ensure that its flow rate can meet the injection needs.

3. Medium adaptability:

- Coal seam water injection usually uses clean water or water with a small amount of additives, and it is necessary to ensure that the pump materials can withstand the corrosion and wear of the medium.

- Choose pump bodies and sealing materials that are corrosion-resistant and wear-resistant.

4. Power selection:

- In situations with stable power supply, a motor-driven high-pressure plunger pump can be selected, which has low operating costs and is environmentally friendly.

- In situations where power supply is inconvenient (such as remote mining areas), a diesel engine-driven high-pressure plunger pump can be selected.

5. Reliability and maintainability:

- Choose a high-pressure plunger pump with a simple structure and easy maintenance to reduce failure rates and maintenance costs.

- Prioritize well-known brands or market-validated products to ensure equipment reliability.

2. Usage methods of high-pressure plunger pumps

1. Installation and debugging:

- Install the high-pressure plunger pump on a stable and solid foundation to ensure that the equipment does not produce excessive vibration during operation.

- Connect the inlet and outlet pipes, ensuring that the piping is well-sealed to avoid leaks.

- During debugging, first perform a no-load operation to check the pump's operating status, and after confirming there are no abnormalities, gradually increase the pressure.

2. Water injection operation:

- Before starting the pump, ensure that the inlet pipeline is unobstructed to avoid air entering the pump.

- Gradually increase the pressure, observe the water injection effect, and ensure that the pressure remains stable within the set range.

- During the water injection process, monitor the flow rate and pressure in real-time to ensure uniform water injection.

3. Shutdown and maintenance:

- After completing the water injection, gradually reduce the pressure and turn off the pump power or diesel engine.

- Regularly check the pump body, sealing components, and piping, and replace worn parts in a timely manner.

- When not in use for a long time, drain the water from the pump and piping to prevent rust.

3. Precautions

1. Safe operation:

- Operators must undergo professional training and be familiar with equipment operating procedures and safety protection measures.

- In a high-pressure environment, avoid direct contact with high-pressure pipelines and joints to prevent high-pressure water jets from injuring people.

2. Pressure monitoring:

- Install pressure sensors and monitoring systems to monitor injection pressure in real-time and avoid overpressure operation.

- Set safety valves to ensure that pressure can be automatically released when it exceeds the set value.

3. Medium filtration:

- Install filters at the inlet to prevent impurities from entering the pump body, causing wear or blockage.

- Regularly clean the filters to ensure unobstructed water intake.

4. Cooling and lubrication:

- Ensure that the cooling system and lubrication system are functioning properly to prevent the pump body from overheating or wearing.

- Regularly check the lubrication oil level and timely replenish or replace the lubrication oil.

5. Environmental adaptability:

- When used in cold regions, pay attention to antifreeze measures to prevent the pump body and piping from freezing.

- In high-temperature or humid environments, pay attention to the equipment's heat dissipation and moisture prevention.

6. Emergency measures:

- Develop emergency plans and equip necessary emergency equipment and tools, such as pressure relief valves, emergency shutdown buttons, etc.

- In case of abnormal situations, immediately shut down for inspection, and restart only after troubleshooting.

4. Summary

In the field of coal seam water injection, the selection of high-pressure plunger pumps should be based on injection pressure, flow rate, medium, and power conditions for reasonable selection. During use, attention should be paid to safe operation, pressure monitoring, medium filtration, cooling and lubrication, and environmental adaptability to ensure efficient, safe, and reliable operation of the equipment. Through scientific operation and maintenance, the service life of the equipment can be extended, and the effectiveness and efficiency of coal seam water injection can be improved.