Increasing efficiency of a combined cycle

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Increasing efficiency of a combined cycle

The first technology is called coal gasification, which uses coal to create a clean-burning gas syngas. The second technology is called combined-cycle, which is the most efficient method of producing electricity commercially available today.

The gasification portion of the IGCC plant produces a clean coal gas syngas which fuels the combustion turbine.

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Coal is combined with oxygen in the gasifier to produce the gaseous fuel, mainly hydrogen and carbon monoxide. The gas is then cleaned by a gas cleanup process. After cleaning, the coal gas is used in the combustion turbine to produce electricity. The exhaust heat from the combustion turbine is recovered in the heat recovery steam generator to produce steam.

This steam then passes through a steam turbine to power another generator, which produces more electricity. Combined cycle is more efficient than conventional power generating systems because it re-uses waste heat to produce more electricity. The integration of these technologies provides the high efficiency of the combined-cycle design with the low cost of coal for fuel.

Advantages of IGCC over current conventional coal-based power generation systems include: Higher efficiencies and lower emissions: Improvements in efficiency dramatically reduce emissions from coal combustion as the graph at right highlights.

Using syngas in a gas turbine increases its output, especially when nitrogen from an oxygen blown unit is fed to the turbine. Thus a turbine rated at MW when fired on natural gas can yield MW or more on syngas. Furthermore, output is less dependent on ambient temperature than is the case with natural gas.

Product flexibility — including carbon capture and hydrogen production: The gasification process in IGCC enables the production of not only electricity, but a range of chemicals, by-products for industrial use, and transport fuels see graphic.

Stacking Functions: Increasing Efficiency with Multi-Function Spaces - The Prepper Journal

The CO2 can be captured in a concentrated stream, making it easier to convert into other products, or to sequester for example, store underground — see CO2 Capture and Storage. An added advantage in this process is that there are low additional costs for carbon capture, particularly if the plant is oxygen driven.

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In addition to electricity generation, hydrogen produced from the process can potentially be used as a transport fuel, in fuel cells.Prediction of full load electrical power output of a base load operated combined cycle power plant using machine learning methods.

The increase of the firing temperature, on which the major efforts of the manufacturers are aimed, is one method to increase the gas turbine efficiency in the simple cycle, but different methods can be available for the combined cycle.

Engineers note that turbine exhaust backpressure is a significant source of efficiency loss in gas turbine combined cycle (GTCC) power plants. Poor aerodynamics in the transition section between the gas turbine and the heat recovery steam generator (HRSG) is the source of this backpressure.

Methods to improve the efficiency of combined cycle power plants were presented.

Increasing efficiency of a combined cycle

• Comparative analysis of open gas turbine cooling techniques. • The effect of the steam use as a gas turbine coolant.

Integrated Gasification Combined Cycle IGCC | Global Greenhouse Warming

• Influence of sequential combustion in a gas turbine. • The use of heat of air cooling the gas turbine in the steam cycle of power plant. European Technology Development Ltd’s (ETD Consulting), International Conference on Power Plant Operation and Flexibility, held in London in July , covered recent developments in plant materials, operation, inspection, maintenance, and costs related to both baseload and cycling operation for different types of plants—including combined cycles.

A combined-cycle power plant uses both a gas and a steam turbine together to produce up to 50 percent more electricity from the same fuel than a traditional simple-cycle plant. The waste heat from the gas turbine is routed to the nearby steam turbine, which generates extra power.

On some perspectives for increasing the efficiency of combined cycle power plants - ScienceDirect