Abstract

Belgard EV-2000 was used as an anti-scale agent in the operation of two MSF distillers at Umm Al Nar station (U.A.E.) for 700 days. The following parameters were measured on a regular basis: seawater inlet and outlet temperatures to and from the heat rejection section, brine heater inlet and outlet temperatures, condensate temperature, brine recirculation flow rate and distillate production. The gain output ratio and the heat transfer coefficient of the heat input section were computer. The top temperature of the distillers varied between 90 and 95°C. The results obtained were compared with those of a similar study using polyphosphate at a top temperature of 90°C. On the whole Belgard EV-2000 ensures a steady distsillers performance, an improvement of the gain output ratio, steadiness of the heat transfer coefficient and an increase in distillate production. Other benefits of Belgard EV-2000 at higher top temperatures are also outlined.

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