A gas & steam power plant is a modern power generation system that combines gas turbine and steam turbine technologies to produce more efficient energy. This system is widely used because it optimizes the natural gas energy utilization.
Over time, this technology has evolved into a clean energy solution for meeting large-scale electricity needs with high efficiency and lower emissions.
To better understand how a gas and steam power plant works, its advantages, and its role in the energy sector, read the full explanation in the following article.
What Is a Gas & Steam Power Plant?
A gas & steam power plant is a power generation system that combines gas turbines and steam turbines in a single working cycle.
The technology in gas & steam power plants uses the residual heat from gas combustion to convert it into additional energy.
With the combined-cycle power plant concept, a gas & steam power plant can generate a large amount of electricity while consuming fuel more efficiently than conventional gas power plants.
This system is widely used in the industrial sector with high electricity demand because it is environmentally friendly and more efficient.
One difference between a gas power plant and a gas & steam power plant lies in how they utilize heat energy. A gas power plant relies solely on gas turbines to generate electricity, whereas a gas & steam power plant reuses the waste heat from the gas turbines to produce steam for a steam turbine, making the electricity generation process more efficient.
Research published in SpringerPlus (2014) reported that the efficiency of gas turbines, which initially ranged from 28–33%, can increase to around 60% by reusing low-grade heat from exhaust gases to drive steam turbines.
Improving energy efficiency has become an important priority for the industrial sector to optimize energy use and reduce carbon emissions.
With better energy management, your industrial operations can run more effectively and economically while supporting environmental sustainability.
To support these needs, PT Chandra Daya Investasi Tbk (CDI), as #YourGrowthPartner, presents integrated energy solutions for the industrial sector through its subsidiary, PT Krakatau Chandra Energi (KCE). One of the services offered is electrical power services.
These services cover Operation & Maintenance (O&M) of power plants, Engineering, Procurement, and Construction (EPC) of electrical systems, as well as repair and overhaul services for transformers and electric motors.
The Operation & Maintenance (O&M) services for Power Generation and Power Distribution from KCE are designed to help power plants, such as gas & steam power plants, operate more optimally, stably, and efficiently.
Through this service, various systems and equipment at power plants can be regularly monitored and maintained to help sustain the performance of electrical facilities in your industrial and business sectors.
How Gas & Steam Power Plant Works
The working principle of a gas & steam power plant essentially combines a gas turbine and a steam turbine into an integrated electricity-generation system. This technology is designed to utilize thermal energy more efficiently, thereby increasing the power plant's efficiency.
The process begins when natural gas is mixed with air and burned in the combustion chamber at temperatures up to 2,600℉ (1,400℃). The combustion process produces high-pressure hot gas that spins the gas turbine, enabling the generator to produce electricity.
After the turbine is turned, the hot exhaust gas, which is still at a high temperature, is not immediately released into the air. The heat is channeled to the Heat Recovery Steam Generator (HRSG), where it heats water until it turns into steam.
High-pressure steam from the HRSG then rotates the steam turbine connected to the additional generator. From this process, the gas & steam power plant can generate additional electricity without requiring much new fuel.
After use, the steam is cooled in the condenser until it condenses back into water. The water is then pumped back to the HRSG for reuse in the next cycle, supporting a continuous generation process.
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Benefits of Gas & Steam Power Plant
Gas & steam power plants have various benefits in supporting modern electricity needs, especially for the industrial sector and large-scale operations. Here are some benefits of gas & steam power plants:
- It has higher energy efficiency compared to conventional power plants.
- It uses waste-heat gas to generate additional electricity, so that energy is not largely wasted.
- It reduces fuel consumption through a combined cycle system.
- It produces lower emissions, making it more environmentally friendly.
- It can provide a stable electricity supply in large quantities.
Gas & Steam Power Plant Components
Gas & steam power plants consist of various main components that are interconnected to generate electricity efficiently. Each component plays an important role in the process of generating energy from gas and steam turbines. Here are some main components of a gas & steam power plant:
1. Gas Turbine Generator
The gas turbine generator is a main component of a gas & steam power plant, consisting of a compressor, combustion chamber, and gas turbine. The compressor increases the air pressure before it is mixed with fuel in the combustion chamber.
The combustion process produces high-pressure hot gas that rotates the turbine. The turbine's rotation then drives the generator to produce electrical energy.
Exhaust gas that is still hot has a high temperature and is not immediately released into the environment. The remaining heat is directed to the Heat Recovery Steam Generator (HRSG) for reuse in the next process.
2. Steam Turbine Generator
The steam turbine generator produces additional electricity from the high-pressure steam supplied by the HRSG. The steam drives the steam turbine connected to the generator.
As the turbine rotates, the generator converts mechanical energy into electrical energy. After passing through the steam turbine, the steam is cooled in the condenser until it condenses back into water, which is then reused in the next generation cycle.
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3. Heat Recovery Steam Generator (HRSG)
A Heat Recovery Steam Generator (HRSG) is a component that utilizes waste heat from gas turbines to generate steam. This system helps reduce wasted energy, making the electricity generation process more efficient.
Inside the HRSG, heat from the exhaust gas is used to heat water until it turns into high-pressure steam. The steam is then directed to a steam turbine to generate additional electrical energy.
The presence of the HRSG is one of the main factors that make gas & steam power plants more efficient compared to conventional power plants.
4. Control and Electrical Systems
The control and electrical systems serve as the operational management center of a gas & steam power plant, ensuring the entire electricity generation process runs in harmony.
Through the control system, operators can directly monitor turbine performance, pressure, temperature, and even power distribution. This system also helps detect disturbances more quickly, minimizing the risk of equipment damage.
Additionally, the electrical system transmits the electrical energy generated by the generator to the transmission network or to other operational needs.
This concludes the explanation of gas & steam power plants, from their definition and how they work to their components and benefits in supporting the efficiency of modern electricity generation.
Backed by modern technology and experience in the energy sector, KCE is ready to deliver more efficient, reliable, and sustainable energy solutions to meet your industry's operational needs.
Advance your industrial operations with integrated energy solutions from KCE and CDI.
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