Umair Gaines
Coal is converted into electricity through a multi-step process. First, the coal is milled into a fine powder, which increases its surface area and allows it to burn more quickly. The powdered coal is then blown into a boiler, where it is burned at high temperatures to produce hot gases and heat energy. This heat energy is transferred to water, tubes lining the boiler, converting the water into steam. The high-pressure steam is directed into a turbine containing propeller-like blades, causing the turbine to rotate at high speed. This rotation drives a generator containing magnets and wire coils, producing electricity through the interaction of the magnets and coils in a process known as electromagnetic induction. The steam, after passing through the turbine, is condensed back into water and returned to the boiler to repeat the cycle. This method of coal-fired electricity generation is commonly employed in thermal power plants, utilizing the kinetic energy of steam to generate electricity.
| Characteristics | Values |
|---|---|
| How coal is converted into electricity | Coal is milled into a fine powder, which is then blown into the combustion chamber of a boiler where it is burnt at high temperatures to produce steam. The high-pressure steam is passed into a turbine, causing the turbine shaft to rotate at high speed. A generator mounted at one end of the turbine shaft produces electricity when rotated in a strong magnetic field. |
| How electricity is transmitted | The electricity generated is transformed into higher voltages of up to 400,000 volts for efficient transmission via power line grids. When it reaches homes, it is transformed into safer 100-250 voltage systems. |
| Coal usage in the U.S. | In 2022, coal accounted for about 19.5% of U.S. electricity generation, with about 513 million short tons consumed. This was equal to around 9.8% of total U.S. energy consumption, the lowest percentage since 1949. |
| Innovations and technologies | As countries phase out coal, new innovations and technologies are being introduced to manage the stabilising properties that coal provided to the electricity system. |
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What You'll Learn
Coal is milled into a powder and burned
Steam coal, also known as thermal coal, is used in power stations to generate electricity. To start the process, coal is milled into a fine powder, which increases its surface area and allows it to burn more quickly. This process is an important step in the combustion of coal, specifically in pulverised coal combustion (PCC) systems.
The act of milling coal into a powder provides a larger surface area, enabling faster combustion. In the PCC system, the powdered coal is blown into the combustion chamber of a boiler, where it is burnt at high temperatures. This combustion process generates hot gases and heat energy, which are essential for the next steps in electricity generation.
The heat energy and hot gases produced from burning the powdered coal play a crucial role in creating steam. Specifically, they convert water, which lines the tubes in the boiler, into steam. This steam is not ordinary steam but rather high-pressure steam, which is then directed into a turbine.
The turbine, a key component in the process, contains thousands of propeller-like blades. The high-pressure steam enters the turbine and exerts a force on these blades, causing the turbine shaft to rotate at high speed. This rotation is a fundamental step in the generation of electricity.
Mounted at one end of the turbine shaft is a generator, consisting of carefully wound wire coils. As the turbine shaft rotates, these coils are rapidly rotated in a strong magnetic field, leading to the generation of electricity. This electricity is then transformed into higher voltages for efficient transmission through power line grids.
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Heat and pressure create steam
The process of converting coal into electricity starts by pulverising coal into a fine powder, which increases its surface area and allows it to burn more quickly. This powdered coal is blown into a combustion chamber of a boiler, where it is burned at high temperatures. The burning coal heats up water in tubes lining the boiler, converting it into steam.
The combustion of coal produces hot gases and heat energy, which is used to convert water into steam. The boiler heats the water to a very high temperature, and the heat from the fire causes it to rapidly turn into steam. This steam is pressurised, and the pressure continues to build as more water is converted into steam. The steam is then directed into a turbine containing thousands of propeller-like blades.
The high-pressure steam enters the turbine and pushes against the blades, causing the turbine shaft to rotate at high speed. The pressure from the steam is what drives the rotation of the turbine, converting heat energy into mechanical energy. The faster the steam, the faster the turbine rotates. Some plants have multiple high and low-pressure turbines, allowing them to use the same steam multiple times.
The steam can pass through the fire multiple times to increase its temperature and energy. This superheated steam has more energy and can be used to rotate the turbines faster, generating more electricity. After passing through the turbine, the steam is condensed back into water and returned to the boiler to be heated again and continue the cycle.
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Steam turns turbines
Steam turbines are a vital component of coal-fired power plants, enabling the conversion of thermal energy into mechanical work and, ultimately, electricity. Invented by Charles Parsons in 1884, the modern steam turbine revolutionized energy generation and made cheap and abundant electricity accessible.
The steam turbine's design and functionality are crucial to its role in electricity generation. These turbines are constructed with spinning blades that rotate within a sealed outer container. When high-pressure steam is directed onto the blades, it causes them to turn, much like the blades of a wind turbine spun by the wind. This rotation generates a powerful force, and the turbine shaft spins at incredibly high speeds, reaching up to 3,600 revolutions per minute.
The turbine's rapid rotation is harnessed to drive electrical generators. The spinning shaft is connected to a generator, which consists of carefully wound wire coils. As these coils rotate rapidly within a strong magnetic field, they produce alternating current (AC) electricity. The generated electricity can then be transmitted through power line grids, transformed into higher voltages for efficient long-distance transmission, and stepped down to safer voltages for domestic consumption.
The cooling and condensing of steam play a significant role in the operation of steam turbines. After passing through the turbine, the steam is cooled and condensed back into water. This process, known as the Rankine cycle, utilizes cooling towers and condensers to facilitate the transformation of steam into water. The condensed water is then returned to the boiler to be heated again, creating a continuous cycle.
The efficiency of steam turbines is further enhanced by their ability to extract maximum energy from the steam. Through multiple stages of steam expansion, the turbines approach an ideal reversible expansion process, optimizing thermodynamic efficiency. Additionally, the use of condensers and cooling towers enables the steam to expand more, allowing the turbine to extract as much energy as possible before condensing it back into water.
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Turbine rotation generates electricity
The conversion of coal into electricity involves several processes, and turbine rotation is a crucial step in this conversion process.
Firstly, coal is milled into a fine powder to increase its surface area, enabling it to burn more quickly. This powdered coal is then blown into a boiler's combustion chamber, where it ignites at high temperatures. The resulting heat energy and hot gases convert water in tubes lining the boiler into steam.
This high-pressure steam is then directed into a turbine, which contains thousands of propeller-like blades. The steam pushes against these blades, causing the turbine shaft to rotate at high speed. This rotation is a key part of electricity generation.
The turbine is connected to a generator, which consists of carefully wound wire coils. When these coils are rapidly rotated within a strong magnetic field, they generate electricity. This process is similar to that of wind turbines, where wind energy spins the blades of a rotor, which in turn rotates a generator to produce electricity.
In the context of coal-fired power generation, the rotation of the turbine, driven by high-pressure steam, is the immediate precursor to the generation of electricity through the rotation of the generator's wire coils. This rotation is a crucial step in converting the potential energy of coal into electrical energy.
It is worth noting that coal-fired power plants are being phased out in favour of more sustainable energy sources and technologies.
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Electricity is transformed for transmission
The process of converting coal into electricity begins with pulverising the coal into a fine powder, which is then blown into a boiler to be burned at high temperatures. This produces hot gases and heat energy, which are used to convert water into steam. This steam is directed into a turbine, which rotates a shaft that spins a generator to create electricity.
The electricity generated then needs to be transmitted over long distances, which is done most efficiently at high voltages. The voltage is transformed and increased by power station transformers to levels suitable for transmission, typically between 115 kV and 765 kV AC in power stations. In the United States, power transmission voltages are generally between 230 kV and 500 kV. This process reduces energy losses during transmission, which are proportional to the current, as described by Joule's first law.
The electricity is then transmitted through power line grids, forming a transmission network. This network is separate from the local wiring between high-voltage substations and end consumers, known as electric power distribution. This distribution network operates at lower voltages, typically between 100 and 250 volts, to ensure safe usage in homes and other domestic settings.
The voltage transformation process is a crucial aspect of electricity transmission and distribution, allowing for efficient long-distance transmission and safe local distribution. This transformation is achieved through the use of transformers, which can step up or step down the voltage as required for either transmission or distribution.
Overall, the transformation of electricity for transmission involves increasing voltages to reduce energy losses during long-distance transmission, followed by decreasing voltages to ensure safe usage in homes and businesses. This process is enabled by power station infrastructure and transformers, allowing for the efficient and safe delivery of electricity from power plants to consumers.
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Frequently asked questions
Coal is burnt in a boiler to heat water and produce steam. The steam then turns a turbine, which is connected to a generator. The movement of the turbine creates a rotation in the generator's magnets, producing electricity.
The coal is milled into a fine powder, which increases its surface area and allows it to burn more quickly.
The steam produced by burning coal is also used in a steam power cycle to generate electricity.
The electricity generated is transformed into higher voltages for efficient transmission via power line grids. When it nears homes, it is transformed into the safer 100-250 voltage systems used domestically.
Coal power plants use coal to heat water and produce steam, whereas gas-fired plants can burn natural gas directly in the turbine to generate electricity.
