Document Type : Original Article
Authors
1
Assistant Professor, Chemistry and Process Research Department, Niroo Research Institute (NRI), Tehran, Iran
2
Chemical and Process Engineering Department, Niroo Research Institute, Tehran, Iran
3
Process and chemical group-Niroo research institute
10.22034/ijche.2023.369608.1252
Abstract
The average consumption of raw water in Tarasht power plant is 2800 m3/day, which is considerable, and therefore it is necessary to provide effective solutions in order to improve the consumption pattern and prevent water wastage. After technical investigations, effective solutions such as recirculation of clean drains of boilers, drains of resin filters backwash, purification and recirculation of cooling tower drains, etc. were studied. Considering the volume and quality of the produced effluent of the power plant, the solution of recirculating clean drains was chosen as the most effective method. Among the various implementation methods of clean drain recycling, two methods of fountain pool and heat exchanger were investigated as two more effective technical and economic methods. Economic studies showed that for the provision of equipment and the implementation of 8 m3/h recycling solution of boiler blowdown, it is necessary to spend 1,070,000,000 Tomans for the fountain pool method and 1,425,630,000 Tomans for the heat exchanger method, that the fountain pool method needs about 25% less cost. Also, recirculation of boiler sludge (200 m3/day) to the raw water with the fountain method (functional efficiency 75%) leads to a 5.3% reduction in water consumption and the use of heat exchanger method (functional efficiency 95%) leads to a reduction of about 6.8% of input raw water. In addition to the economic results, technical studies showed that the fountain pool method has more advantages than other methods of recirculating boilers due to the simplicity of operation, the possibility of removing iron and hydrazine.
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