Solution for vertical long shaft semi submersible turbine pump for geothermal power generation

Geothermal power generation is a clean energy generation method that utilizes the thermal energy of underground hot water and steam to convert it into mechanical energy, which is further converted into electrical energy. The core process includes geothermal resource extraction, energy conversion, power generation, and reinjection. The vertical long axis semi submersible turbine pump is a key equipment to ensure efficient transportation of geothermal fluids.
Geothermal power generation long shaft pump solution
1. Equipment selection and adaptation
Conventional geothermal extraction scenario: using heat-resistant vertical long axis semi submersible deep well turbine pumps, the flow passage components are made of super duplex steel material, which can adapt to geothermal water media at 80-150 ℃ and has excellent resistance to chloride corrosion; The head covers 50-300 meters and the flow rate can reach 100-1000m ³/h, meeting the mining needs of small and medium-sized geothermal wells. The installation depth of the pump generally does not exceed 90 meters, and the installation and maintenance of ground components are relatively convenient.
High temperature and high corrosion geothermal scenario: If the temperature of the geothermal water exceeds 150 ℃ and contains strong corrosive components such as hydrogen sulfide, a high-temperature wear-resistant lining plate can be installed on the pump body. The core components are made of Hastelloy alloy material, and a water-cooled bearing box is also configured to ensure the stable operation of the vertical long shaft semi submersible turbine pump equipment in high temperature environments; For geothermal wells with deep depths, a multi-stage series vertical long shaft semi submersible turbine pump can be used to extract deep geothermal fluids through relay lifting.
Recharge scenario: A vertical long shaft semi submersible turbine pump with high flow rate and low head should be selected for the recharge pump. The pump body should be made of corrosion-resistant materials and equipped with a pressure balancing device to avoid equipment damage caused by pressure fluctuations during the recharge process, ensuring the sustainable exploitation of geothermal resources.
2. Stable operation guarantee
The rotor of the vertical long shaft semi submersible turbine pump adopts a withdrawable design, which can complete the maintenance of core components such as impellers and guide bearings without disassembling the pump body, greatly reducing downtime and ensuring the continuity of geothermal power generation.
Equipped with an external cooling and lubrication system to ensure the normal operation of the guide bearing under high temperature and high load conditions; The shaft seal adopts a mechanical seal structure and is supported by rolling bearings at the sealing installation site to reduce the deflection of the pump shaft and avoid leakage problems caused by uneven stress on the sealing surface.
In response to the thermal expansion characteristics of geothermal water, the pump body design reserves thermal expansion compensation space to avoid equipment damage caused by uneven expansion of components; At the same time, stress monitoring devices are installed at key parts of the pump shaft to provide real-time warning of the risk of shaft deformation.
3. Energy saving optimization and upgrading
Equipped with an intelligent frequency conversion control system, the pump speed is automatically adjusted according to the outlet pressure, flow rate, and power generation load of the geothermal well, avoiding ineffective energy consumption and achieving an energy-saving effect of 20% -25%.
For geothermal power plants with multi well joint exploitation, a multi pump parallel vertical long axis semi submersible turbine pump operation scheme can be adopted, which intelligently starts and stops the water pump according to the geothermal resource reserves and exploitation pressure of each well, optimizing energy utilization efficiency.
4. Intelligent control and system optimization
Deploy temperature, pressure, flow, and water quality sensors, build an IoT monitoring network, collect real-time data and upload it to the cloud to achieve data-driven precision scheduling, and timely warn of equipment failures and geothermal fluid anomalies.
Optimize the overall layout of geothermal extraction and reinjection systems, reasonably set up pump station locations and pipeline routes, and reduce pipeline resistance losses; At the same time, strengthen the pretreatment process of geothermal water, control the sediment and impurity content in the water, and reduce the wear and corrosion of vertical long axis semi submersible turbine pumps.
Application case of vertical long shaft pump for geothermal power generation
Scenario Requirements
A certain hot dry rock geothermal power generation project requires extracting high-temperature geothermal water with a temperature of up to 180 ℃ from deep underground to drive turbine power generation. The pumping equipment has extremely high requirements for high temperature resistance, corrosion resistance, and stable operation ability, while also adapting to the installation environment of deep wells.
Plan and Implementation
Choose customized vertical long shaft semi submersible deep well turbine pump as the core pumping equipment:
The core components are made of special high-temperature resistant materials, which can withstand medium temperatures up to 200 ℃. At the same time, anti-corrosion coatings have been applied to the overcurrent components to effectively resist medium corrosion, targeting the corrosive components in geothermal water;
A super long underwater structure has been designed to adapt to deep well conditions, with a depth of up to 50 meters, ensuring the ability to extract geothermal water deep into the formation;
Equipped with an intelligent monitoring system, real-time collection of operating data such as temperature, pressure, and vibration of the pump body is achieved to achieve remote monitoring and fault warning, reducing the difficulty of operation and maintenance.
Operational advantages
After the vertical long axis semi submersible turbine pump equipment is put into use, the efficiency of geothermal water extraction is stable, providing a continuous and stable heat source for geothermal power generation units and ensuring the continuous power generation of the power station. At the same time, the high temperature resistance and anti-corrosion design of the equipment significantly reduces maintenance frequency, and the service life is increased by more than 30% compared to ordinary pumps, effectively reducing the operation and maintenance costs of the power station.