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Cogeneration |
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Cogeneration is a process that generates electricity while capturing the waste heat from generation for other productive uses. The captured waste heat is utilized in an adjacent process avoiding the use of additional fuel to generate the required heat. Cogeneration lowers emissions to the environment, particularly carbon dioxide by capturing and recycling waste heat, and can be highly efficient.
ALLENE is intending to involve in cogeneration projects after find some suitable and reputed partners. In these projects, a gas turbine turns an electrical generator. The hot exhaust gas from the turbine is captured in a heat recovery boiler where the heat is converted to steam. The steam is used in an adjacent process.
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Combined-Cycle |
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Combined-cycle power plants combine a gas turbine and a steam turbine to produce electricity from one fuel input. A gas turbine turns an electrical generator. The hot exhaust gas from the turbine is captured in a heat recovery boiler where the majority of the heat is converted into steam. The steam is then injected into a steam turbine that turns another electricity generator, resulting in additional output of electricity from the one fuel input.
Combined-cycle plants operate at higher levels of efficiency than traditional thermal generation and natural gas contributes considerably less to air pollution than conventional coal or oil-fired generation.
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Open-Cycle |
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ALLENE uses open-cycle gas turbines and Diesel Generator for peaking and/or occasional loads. These units can be brought up to full operational mode within minutes. The quick path to full operation makes these units ideal to meet peaking loads to provide additional system reliability or support.
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Coal-Fired Thermal Generating Plants |
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After Discovering the world largest Coal deposits in Thar, Sindh Province, that have potentials of generating Millions MW power, Allied Power Generations is intending to form venture the projects that will be based on Coal fired technology, for prospective projects and further information contact with ALLENE Email ALLENE. >>
In these thermal power stations, coal is burned to heat water in a boiler and convert it to high-pressure steam. The high-pressure steam is directed into a steam turbine, which turns the turbine shaft. This shaft is connected to an electrical generator, which produces electricity.
A condenser converts the steam exhausting from the turbine back into water, which is reused in the boiler. The condenser contains tubes, which have water circulating through them to cool the steam. The water is supplied by a nearby reservoir or river. This condensing process increases the efficiency of electricity generation.
Coal for the generating stations is often extracted from a nearby coal mine. The mined land is reclaimed, often to a level better than its original state. For example, the Sheerness Generating Station works with the local mining company to ensure that the mined land is returned to levels of productivity as good or better than existed previous to mining.
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Coal haulers take the coal to the generating station, where it is crushed and stockpiled. A conveyor belt carries the crushed coal from the stockpile to bunkers within the power station. The coal is fed as required into pulverizers, where it is ground to a fine dust, the consistency of talcum powder.
A fan blows the coal into the boiler’s furnace. Water flows through tubes that form the walls of the furnace and the intense heat of the burning coal causes the water inside the tubes to boil.
The boiling water rises into the steam drum at the top of the boiler where the steam is separated from the water. The steam, at high pressure, is super-heated to still higher temperatures and then used to turn the steam turbine and an electricity generator. After leaving the turbine, the steam – now at a lower temperature and a lower pressure – passes through the condenser, condensing the steam back into water, which is pumped back to the boiler to repeat the cycle.
The fine, powdery ash produced when coal is burned is called flyash. The hot gases and flyash move out of the boiler’s furnace and into electrostatic precipitators – a series of electrically charged metal plates that attract and hold the flyash particles. The collected flyash is either sold for use as an additive to concrete or trucked to the mine site to be used for fill. |
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