Analysis of a spray flash desalination system driven by low-grade waste heat with different intermittencies

Benan Cai, Chengjun Long, Qiaochen Du, Wenchao Zhang, Yandong Hou, Haijun Wang and Weihua Cai

Energy, 2023, vol. 277, issue C

Abstract: Making full use of low-grade waste heat is of great significance in desalination technology. A spray flash desalination system driven by low-grade waste heat is established in this paper. The complex intermittency is taken into account in the current modeling analysis. The transient feed tank temperature, long-term system capacity, total production and energy performance of the system are investigated for various intermittencies. The results reveal that the maximum feed tank temperature presents a non-monotonic variation and reaches a stable value of 342.8 K when the rate of heat storage reaches 0. The transient production rate profiles display a jump at the intersection between the period when the waste heat source is on and off. The total production increases by 150.1% as the intermittency decreases from 80% to 20% at t = 1200min. The feed water flow rate has a non-monotonic effect on the total production for 75% intermittency. The specific thermal energy consumption (STEC) rises from 278.63 to 1023.51 kJ/kg as the feed water flow rate increases from 2 to 10 L/min at t = 60min. STEC is more affected by the feed water flow rate compared with other parameters.

Keywords: Spray flash evaporation; Low-grade waste heat; Intermittency; Thermal storage; Long-term performance (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:277:y:2023:i:c:s0360544223010630

DOI: 10.1016/j.energy.2023.127669

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