Extraction Turbine

An extraction turbine, also known as an extraction condensing turbine or a condensing-extraction turbine, is a type of steam turbine used in power generation and industrial processes. It is designed to simultaneously generate mechanical power (often in the form of electricity) and extract steam at one or more intermediate points for specific industrial processes or heating applications. Extraction turbines are known for their versatility and efficiency in combined heat and power (CHP) systems. Here are the key features and characteristics of extraction turbines:

Key Features of Extraction Turbines:

  1. Multiple Extraction Points: Extraction turbines have one or more extraction points along their length, typically located between stages of the turbine. At these extraction points, steam is tapped off from the main steam flow for various industrial processes or heating applications. Each extraction point provides steam at a different pressure and temperature.
  2. Steam Quality: Extraction turbines are designed to provide high-quality, dry steam at different pressure levels at each extraction point. The extracted steam is typically suitable for processes that require precise temperature and pressure control.
  3. Combined Heat and Power (CHP): Extraction turbines are often used in CHP systems, also known as cogeneration systems. In CHP, the turbine generates both electricity and process steam or district heating, maximizing the overall energy efficiency of the system.
  4. Efficiency: Extraction turbines are known for their high efficiency, especially in CHP applications. By extracting steam at multiple points and efficiently utilizing the energy in the steam for various purposes, they can achieve excellent overall efficiency.
  5. Applications: Extraction turbines find applications in various industries, including power generation, chemical manufacturing, paper and pulp production, district heating, and petrochemical processes. They are particularly well-suited for industries that require both electricity and process steam.
  6. Control Systems: Extraction turbines are equipped with sophisticated control systems to manage the extraction of steam at various pressures and maintain stable operation under changing load conditions.
  7. Steam Condensing: After the extraction points, the remaining steam continues to expand and is typically condensed into water to maximize energy extraction. The condensed water can be returned to the boiler to be converted into steam again, enhancing overall efficiency.
  8. Design Flexibility: The number of extraction points and their locations can be customized to meet the specific requirements of an industrial facility or power plant.
  9. Environmental Benefits: CHP systems using extraction turbines can reduce greenhouse gas emissions and energy wastage by efficiently utilizing waste heat for heating and other processes.

Extraction turbines are a crucial component in many industrial and power generation applications where the simultaneous production of electricity and high-quality process steam is essential. Their design and operational flexibility make them an ideal choice for optimizing energy utilization in a wide range of industries.

Extraction Turbine

Extraction Turbine
Extraction Turbine

An extraction turbine is a type of steam turbine that removes steam at one or more intermediate points along its length, rather than exhausting all of the steam at the end. The extracted steam is typically used for process heating or other purposes, while the remaining steam is used to generate electricity. Extraction turbines are more efficient than condensing turbines, as they make use of all of the energy in the steam.

Working Principle of an Extraction Turbine:

  1. Steam Entry and Expansion: High-pressure steam enters the first stage of the turbine through a nozzle or inlet valve, gaining velocity and decreasing pressure.
  2. Blade Interaction: The fluid strikes the rotor blades of the first stage, transferring its kinetic energy to the blades. This interaction causes the blades to rotate, generating rotational motion.
  3. Stage Transition: The partially expanded fluid exits the first stage and enters the second stage through intermediate passages or ducts.
  4. Repeated Expansion: The fluid undergoes further expansion and energy extraction as it passes through subsequent stages, each with its own set of rotor blades.
  5. Extraction Points: At one or more intermediate stages, a portion of the steam is extracted through extraction ports or openings. This extracted steam is used for process heating or other purposes.
  6. Remaining Steam Expansion: The remaining steam continues to expand and generate rotational motion as it passes through the final stages of the turbine.
  7. Exhaust Stage and Exit: The fully expanded and low-pressure steam exits the final stage through an exhaust port or nozzle. This exhaust steam can be condensed to recover water or used for other purposes.

Advantages of Extraction Turbines:

  1. Improved Energy Efficiency: Extraction turbines utilize the extracted steam for process heating or other purposes, maximizing energy utilization and reducing overall energy consumption.
  2. Enhanced Process Control: The ability to extract steam at various pressures allows for precise control of process temperatures and pressures, improving process efficiency and product quality.
  3. Reduced Fuel Consumption: By extracting steam for process needs, extraction turbines reduce the amount of steam required for power generation, leading to lower fuel consumption and environmental impact.
  4. Versatility and Adaptability: Extraction turbines can be tailored to specific process requirements by adjusting the extraction points and steam flow rates, making them versatile and adaptable to various applications.

Applications of Extraction Turbines:

  1. Industrial Process Heating: Extraction turbines are widely used in various industries for process heating, such as papermaking, chemical processing, and food processing.
  2. Cogeneration (Combined Heat and Power): Extraction turbines are often employed in cogeneration plants to simultaneously generate electricity and provide steam for process heating, achieving higher overall energy efficiency.
  3. Marine Propulsion: Extraction turbines were traditionally used in marine propulsion systems, particularly in large ships, to provide both power and steam for shipboard operations.
  4. District Heating Systems: Extraction turbines can be used in district heating systems to generate electricity and provide hot water for space heating and domestic purposes.
  5. ** desalination plants:** Extraction turbines can be used in desalination plants to generate electricity and provide low-pressure steam for the desalination process.

Overall, extraction turbines play a crucial role in various industrial and power generation applications, offering improved energy efficiency, process control, and versatility compared to condensing turbines. Their ability to extract steam for process needs enhances overall energy utilization and reduces fuel consumption, making them an environmentally friendly and sustainable technology.

Multiple Extraction Points

Multiple extraction points in a steam turbine allow for the removal of steam at various pressure levels, enabling the turbine to serve multiple purposes simultaneously. This design feature is particularly beneficial in industrial settings where steam is required for both power generation and process heating or other applications.

Advantages of Multiple Extraction Points:

  1. Enhanced Efficiency: By extracting steam at intermediate pressures, multiple extraction points allow for more complete utilization of the steam’s energy. This results in improved overall efficiency and reduced fuel consumption compared to single-extraction or condensing turbines.
  2. Greater Process Control: Multiple extraction points provide more flexibility in controlling process temperatures and pressures, enabling precise adjustments to meet specific process requirements. This enhanced control can optimize process efficiency and product quality.
  3. Versatility and Adaptability: Turbines with multiple extraction points can be tailored to a wider range of applications and process needs. By adjusting the extraction flow rates and pressures, these turbines can adapt to fluctuating process demands and optimize energy utilization.
  4. Reduced Environmental Impact: By maximizing energy extraction and reducing fuel consumption, multiple extraction points contribute to lower greenhouse gas emissions and a more sustainable energy production approach.

Applications of Multiple Extraction Turbines:

  1. Industrial Process Heating and Cooling: Multiple extraction turbines are widely used in various industries for both heating and cooling purposes. For instance, they provide steam for papermaking, chemical processing, food processing, and textile manufacturing.
  2. Cogeneration (Combined Heat and Power): In cogeneration plants, multiple extraction turbines play a crucial role in generating electricity while simultaneously producing steam for process heating or other industrial needs. This combined approach significantly improves overall energy efficiency.
  3. Marine Propulsion: Traditional marine propulsion systems often utilized multiple extraction turbines to provide both power and steam for shipboard operations, including heating, ventilation, and cargo handling.
  4. District Heating Systems: Multiple extraction turbines can efficiently generate electricity and provide hot water for space heating and domestic purposes in district heating systems.
  5. Desalination Plants: In desalination plants, multiple extraction turbines can be employed to generate electricity and provide low-pressure steam for the desalination process, reducing energy consumption and production costs.


Multiple extraction points in steam turbines offer significant advantages in terms of energy efficiency, process control, versatility, and environmental impact, making them a preferred choice for various industrial applications and power generation systems. By extracting steam at intermediate pressures, these turbines optimize energy utilization, enhance process control, and reduce the overall environmental footprint of energy production.

Combined Heat and Power (CHP)

Combined heat and power (CHP), also known as cogeneration, is an energy-efficient technology that simultaneously generates electricity and useful thermal energy (heating and/or cooling) from a single fuel source. This integrated approach maximizes energy utilization, reducing overall fuel consumption and greenhouse gas emissions compared to separate power generation and heating or cooling systems.

Principle of CHP:

  1. Fuel Combustion or Thermal Input: A fuel, such as natural gas, coal, or biomass, is combusted or subjected to a heat source to generate thermal energy.
  2. Electricity Generation: The thermal energy is used to drive a turbine, generator, or other power conversion device to produce electricity.
  3. Heat Recovery and Utilization: The waste heat from the power generation process is captured and utilized for space heating, domestic hot water, industrial processes, or district heating systems.

Benefits of CHP:

  1. Increased Energy Efficiency: CHP achieves higher overall efficiency compared to separate power generation and heating systems, typically reaching 70-80% efficiency.
  2. Reduced Fuel Consumption and Costs: By utilizing the waste heat, CHP systems consume less fuel, leading to lower fuel costs and greenhouse gas emissions.
  3. Environmental Benefits: CHP contributes to reducing air pollution and greenhouse gas emissions by minimizing fuel consumption and improving energy efficiency.
  4. Flexibility and Reliability: CHP systems can provide both electricity and thermal energy flexibly, adapting to changing demand patterns and enhancing grid stability.
  5. Applications in Various Sectors: CHP is applicable in various sectors, including residential, commercial, industrial, and institutional settings.

Applications of CHP:

  1. District Heating Systems: CHP plants are often used in district heating systems, providing both electricity and heat to a network of buildings or communities.
  2. Industrial Processes: CHP systems are widely used in industries like pulp and paper, food processing, and chemicals to generate electricity and heat for their operations.
  3. Commercial Buildings: CHP installations can be found in large commercial buildings, such as hospitals, hotels, and office complexes, to meet their electricity and heating needs.
  4. Residential Applications: CHP systems are increasingly being adopted in residential settings, especially in multi-family housing and apartment buildings.
  5. Renewable Energy Integration: CHP technology can be integrated with renewable energy sources, such as solar or geothermal energy, to further enhance sustainability and environmental benefits.

Challenges of CHP:

  1. Initial Investment Costs: CHP systems may have higher initial investment costs compared to separate power generation and heating systems.
  2. Maintenance Requirements: CHP systems require regular maintenance to ensure optimal performance and efficiency.
  3. Grid Integration Issues: Integrating CHP systems into the electricity grid can require careful planning and coordination to manage fluctuations in power generation.
  4. Fuel Type and Emissions: The environmental impact of CHP depends on the type of fuel used, with fossil fuels having higher emissions compared to renewable or low-carbon alternatives.

Despite these challenges, CHP technology offers a promising solution for improving energy efficiency, reducing fuel consumption, and minimizing environmental impact across various sectors. As demand for sustainable energy solutions grows, CHP is expected to play an increasingly important role in the future of energy generation and utilization.

Steam Condensing

In a steam turbine, steam condensing is a crucial process that converts high-pressure steam into low-pressure water. It plays a pivotal role in power generation and industrial applications, enabling efficient energy extraction from steam and enhancing the overall performance of steam turbines.

Mechanism of Steam Condensation in Steam Turbines:

  1. Steam Expansion and Pressure Drop: As steam expands through the turbine blades, its kinetic energy is converted into rotational motion. This expansion process also leads to a significant decrease in steam pressure.
  2. Saturation Point and Phase Transition: At a certain pressure and temperature, referred to as the saturation point, steam becomes saturated, meaning it can coexist in both liquid and vapor phases.
  3. Heat Rejection and Condensation: As the steam expands and cools below its saturation point, it releases latent heat, also known as heat of vaporization. This heat is typically transferred to a cooling medium, such as water, through a condenser.
  4. Liquid Phase Formation: The release of latent heat during condensation causes the steam molecules to lose energy and slow down, eventually transitioning from a vapor phase to a liquid phase, forming water droplets.

Significance of Steam Condensation:

  1. Energy Conversion Efficiency: Condensing steam allows for the extraction of a significant portion of the remaining energy from the steam, leading to higher overall efficiency of the steam turbine.
  2. Pressure Maintenance for Subsequent Stages: Condensation reduces the exhaust pressure of the turbine, allowing for continuous steam flow through subsequent stages, maintaining the energy conversion process.
  3. Water Recovery and Reuse: The condensed water, also known as condensate, can be recycled back to the boiler, reducing water consumption and operating costs.
  4. Environmental Benefits: By converting steam into liquid water, steam condensation contributes to reducing greenhouse gas emissions and promoting sustainable energy practices.

Applications of Steam Condensation in Steam Turbines:

  1. Power Generation: Steam turbines are the primary technology for generating electricity in large-scale power plants. Steam condensation is essential for achieving high efficiency and maximizing power output.
  2. Marine Propulsion: In marine propulsion systems, steam turbines were traditionally used to drive propellers. Steam condensation played a crucial role in maintaining pressure and energy extraction for propulsion.
  3. Industrial Applications: Steam turbines are employed in various industrial processes, such as papermaking, chemical processing, and food processing. Steam condensation provides low-pressure steam for heating and other applications.
  4. District Heating Systems: Steam turbines can be used in district heating systems to generate electricity and simultaneously provide hot water for space heating and domestic purposes. Steam condensation allows for efficient heat transfer to the water.


Steam condensation is an integral part of steam turbine operation, enabling efficient energy extraction, pressure maintenance, and water recovery. It is crucial for power generation, marine propulsion, industrial applications, and district heating systems. By optimizing steam condensation processes, engineers can enhance the performance, efficiency, and sustainability of steam turbines.

Steam Quality

Steam quality is a crucial parameter in steam turbine operation, as it directly affects the turbine’s efficiency and performance. Steam quality refers to the purity and dryness of the steam, typically measured as the percentage of steam by weight in the steam-water mixture.

Importance of Steam Quality in Steam Turbines:

  1. Efficiency Enhancement: High steam quality ensures efficient energy extraction from the steam, leading to higher turbine efficiency. Lower steam quality, with entrained water droplets, reduces efficiency due to erosion of turbine blades and increased friction.
  2. Erosion Protection: Water droplets in wet steam can cause erosion of the turbine blades, leading to blade damage and reduced turbine lifespan. Maintaining high steam quality protects the blades from erosion and extends the turbine’s service life.
  3. Smooth Operation: High steam quality ensures smooth and stable turbine operation, preventing vibrations and potential damage to the turbine and its components.

Factors Affecting Steam Quality:

  1. Boiler Operation: Proper boiler operation, including efficient steam generation and effective water purification, is essential for maintaining high steam quality.
  2. Steam Conditioning: Steam conditioning techniques, such as steam separators and dryers, can remove entrained water droplets and improve steam quality.
  3. Steam Piping System: The design and maintenance of the steam piping system can influence steam quality. Proper insulation and drainage prevent condensation and maintain steam purity.

Measuring Steam Quality:

  1. Steam Quality Meters: Various steam quality meters are available, such as moisture separators and conductivity probes, to measure the percentage of steam and water in the steam flow.
  2. Visual Inspection: Experienced technicians can visually inspect steam lines for signs of wet steam, such as condensation or water droplets.
  3. Temperature and Pressure Measurements: Analyzing steam temperature and pressure can provide indirect indications of steam quality, as wet steam exhibits lower temperatures and higher pressures.

Maintaining Steam Quality:

  1. Regular Monitoring: Regular monitoring of steam quality using appropriate instruments and techniques is crucial for early detection of any issues.
  2. Preventive Maintenance: Implementing preventive maintenance measures for the boiler, steam conditioning equipment, and steam piping system helps maintain high steam quality.
  3. Prompt Troubleshooting: Addressing any identified steam quality issues promptly prevents further damage to the turbine and ensures optimal performance.


Steam quality is a critical aspect of steam turbine operation, influencing efficiency, erosion protection, and overall performance. Maintaining high steam quality requires proper boiler operation, steam conditioning, and regular monitoring. By ensuring high steam quality, steam turbines can operate efficiently, produce more power, and extend their lifespan.

EMS Power Machines

EMS Power Machines
EMS Power Machines

We design, manufacture and assembly Power Machines such as – diesel generators, electric motors, vibration motors, pumps, steam engines and steam turbines

EMS Power Machines is a global power engineering company, one of the five world leaders in the industry in terms of installed equipment. The companies included in the company have been operating in the energy market for more than 60 years.

EMS Power Machines manufactures steam turbines, gas turbines, hydroelectric turbines, generators, and other power equipment for thermal, nuclear, and hydroelectric power plants, as well as for various industries, transport, and marine energy.

EMS Power Machines is a major player in the global power industry, and its equipment is used in power plants all over the world. The company has a strong track record of innovation, and it is constantly developing new and improved technologies.

Here are some examples of Power Machines’ products and services:

  • Steam turbines for thermal and nuclear power plants
  • Gas turbines for combined cycle power plants and industrial applications
  • Hydroelectric turbines for hydroelectric power plants
  • Generators for all types of power plants
  • Boilers for thermal power plants
  • Condensers for thermal power plants
  • Reheaters for thermal power plants
  • Air preheaters for thermal power plants
  • Feedwater pumps for thermal power plants
  • Control systems for power plants
  • Maintenance and repair services for power plants

EMS Power Machines is committed to providing its customers with high-quality products and services. The company has a strong reputation for reliability and innovation. Power Machines is a leading provider of power equipment and services, and it plays a vital role in the global power industry.

EMS Power Machines, which began in 1961 as a small factory of electric motors, has become a leading global supplier of electronic products for different segments. The search for excellence has resulted in the diversification of the business, adding to the electric motors products which provide from power generation to more efficient means of use.

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