Low pressure steam generation by recovering waste heat using Heat Re-claimers at Emirates CMS Power
Emirates CMS Power Company (ECPC) is a private joint stock company. The company own & operates integrated power and water desalination plant at the Al Taweela, Abu Dhabi, UAE. ECPC is the first Independent Water & Power Producer (IWPP) in the United Arab Emirates. The plant is designed on co-generation operation cycle where power and desalinated water is generated at 777 MW and 50 Million imperial gallons per day (MIGD) respectively.
The Heat re-claimer project activity represents an innovative solution to increase plant efficiency beyond, and contribute to reduce the environmental footprint of power and water production. In addition to mitigation of the effects of climate change, heat re-claimers contribute to sustainable development in the Emirate of Abu Dhabi through conservation of natural resources (fossil fuel) and introduction of new practices and technology. Reduced combustion of fossil fuels will reduce the local air pollution, which is expected to improve the living conditions in the area.
Heat re-claimer serve as an example for other IWPP’s and will have a very positive impact on increasing environmental awareness and improve management of pollutants. By providing a value to the reduction in CO2 emissions which are generated in the scenario prior to the project activity through burning auxiliary NG, CDM revenues provide an important vehicle to promote introduction of environmentally friendly technologies in the power sector in the UAE.
To increase the fuel efficiency of the plant, each Heat Re-claimer (HR) is installed behind the economizer of each HRSG to produce saturated low pressure steam that can be used productively in the MSF desalination units. For every HRSG flue gas duct, one module of HR is arranged in parallel to the flue gas flow. Each HR constitutes of serrated fin tubes/modules. These modules are placed directly in the flue gas path and recover waste heat. The modules are attached to a steam drum through a top riser and bottom header which creates natural circulation. LP steam generated is then supplied to the MSF. Pressure parts of the serrated evaporators tubes and drum are designed for 205 °C at 16 bar (g) pressure. After providing energy LP steam is converted to liquid phase called as condensate. The condensate is pumped back to HR using existing pump. As a result of addition of heat re-claimer’s it is envisaged to reduce CO2 emissions by eliminating auxiliary NG firing in the existing HRSGs. The technology to be implemented is environmentally friendly and safe as it prevents thermal discharges to the local environment and reduces CO2 emission. The Heat re-claimer project technology is sound and is widely accepted in energy sectors.
The objective of the CDM project is to recover and utilize waste heat from the flue gases, discharged to the atmosphere. The project implemented to reduce Thermal discharges and GHG (Green House Gas) emissions at A2 plant. Waste heat is recovered through heat re-claimers (HR) to generate low pressure steam to heat the brine water feed at two of the Multi Stage Flash (MSF) desalination units. The project activity will reduce the fossil fuel consumption associated with steam generation.
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