Organic Rankine cycle |
Above: Figure 6. Visualisation of waste heat recovery units and oil heat transfer circuit at the Dahshour gas compressor station
controller. The overall automation system will be able to balance the remaining pumping capacity, as necessary, adjusting the operating gas turbine loads or switching on/off the available gas turbines.
In addition to the Island power management system the compression station will also be able to share the load (load meaning quantity of natural gas pumped by each of the seven compressors that will be present in the Dahshour facility) between the existing gas turbine driven compressors and the new electric motor driven compressors. The system will prioritise and maximise the use of the electric motor driven compression according to the frequency set point and maximum producible power by the ORC. The remaining delta power (if any) between actual operation and discharge pressure set point from the gas header is provided by
Figure 7. ORC automation at the Dahshour gas
compressor station, general scheme
increasing gas turbine load or switching on the fifth new gas turbine.
Figure 7 shows the general scheme of the ORC automation system.
of natural gas per year. This gas, rather than being burned in traditional-scheme gas turbines will be sold into the market. The ORC thus enables waste power to be converted into useful revenues while at the same time increasing the pumping capacity of the compression station. The Dahshour compression station project provides a concrete demonstration of how
ORC benefits demonstrated It is estimated that the Dahshour ORC installation will generate overall some 192 GWh/year of fuel free electricity, fully used to enhance the efficiency of the facility, avoiding carbon dioxide emissions and at the same time saving 65 million Sm3
the organic Rankine cycle can deliver energy efficiency and decarbonisation, and is indeed the first instance where the oil and gas industry has committed to an investment that both increases the gas processing capacity at a compression station and at the same time reduces the amount of natural gas consumed to compress the natural gas transported in the pipeline system.
As already noted, Turboden has many ORC power plants in operation around the world, but the Dahshour project will be the first in Egypt. Other similar projects are currently under discussion in Egypt, elsewhere in the Middle East, in the USA and in a number of other gas producing countries. These projects are likely to come to fruition because large gas producers are increasingly recognising the value of energy efficiency in process facilities.
20 | July/August 2021 |
www.modernpowersystems.com
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