Evaluation of multi-effect distillation unit (MED) for desalination of Iranshahr steam power plant effluents using heat losses of boiler blowdown

Authors

1 Mechanical Engineering Faculty, Shahrood University of Technology, Shahrood

2 Mechanical Engineering Faculty, Shahrood University of Technology

3 Faculty of Chemical and Materials Engineering, Shahrood University of Technology, Shahrood, Iran

10.22044/jsfm.2024.13667.3798

Abstract

Industrial effluents is one of the important sources of pollution in industrial activities, including power plants. With the basic control of industrial effluents, in addition to preventing its harmful effects, the consumption of limited water resources is also saved. Due to the high energy consumption of different desalination systems to produce fresh water, as well as the heat losses in power plants, a major part of the effluents can be desalinated for reuse in processes that require water. In this study, the simulation of a multi-effect distillation (MED) unit for a steam power plant is done by Thermoflow software. The required thermal energy of the unit is supplied from the boiler blowdown stream. Sensitivity analysis has been done on the basic parameters in the simulation to select the optimal values. In the premier scenario, considering the eavailability of 870 m3/day of effeluent from various units of IRANSHAHR steam power plant, a MED desalination plant with 12 effects with the ability to produce 290 m3/day of fresh water is proposed. The steam consumption rate is 1.1 ton/hr, which is about one seventh of the power plant's boiler capacity. The gain of ratio of the proposed system is equal to 10.2 and the recovery ratio is 33%. The investment cost of the proposed system is 3290 $ per cubic meter of fresh water per day.

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References

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Journal of Solid and Fluid Mechanics
Volume 13, Issue 6
January and February 2024
Pages 89-102

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