Marine desalination system

Abstract

The invention discloses a marine sea water desalination system. The marine sea water desalination system comprises an intermediate heat exchanger, a heat source circulating pump, a sea water pump, a distillation system, an adjustable two-stage ejector, a normally-closed valve, a first signal detection controller, a second signal detection controller, a pressure switch and a buffer tank. The elements of the first signal detection controller, the normally-closed valve and the adjustable two-stage ejector are arranged, all the elements are mutually independent and related, the operation is detected fully automatically, the steam and the concentrated sea water are prevented from being pumped out from a concentrated sea water outlet, and the yield of fresh water is guaranteed. When the operation condition changes, the vacuum degree of the distillation system is detected in real time through the second signal detection controller and is regulated through the movement of an adjustable two-stage nozzle in the adjustable two-stage ejector, so that the yield of the fresh water is regulated, the operation stability of the system is guaranteed when the working condition changes, and the yield of the fresh water is improved.

Description

technical field [0001] The invention relates to the technical field of seawater desalination, in particular to a marine seawater desalination system. Background technique [0002] Fresh water supply is very important for ocean-going ships. In order to meet the water demand during navigation, the fresh water carried by the ship itself is far from enough, and long-term storage of water is easy to cause bacteria to grow. Therefore, ships need to be equipped with seawater desalination devices to improve the endurance of ships. Currently, the mainstream seawater desalination methods are reverse osmosis and distillation. The advantage of the reverse osmosis method is high integration; the disadvantage is that multiple pretreatments are required for the feed seawater, the quality of the produced water is not high, and the reverse osmosis membrane modules need to be replaced regularly, which is costly. Distillation seawater desalination devices generally use steam or hot water as ...

AI Technical Summary

Problems solved by technology

However, the marine distillation seawater desalination device can only work stably in a small range of working conditions. When the thermal load of the diesel engine changes greatly, the evaporation temperature drops due to the reduction of heat source heat, and the ejector cannot be adjusted to reduce the vacuum of the distiller. temperature, the water production of the system will drop significantly, or even stop working

Even if the fluctuation of the working conditions is not large, part of the steam and concentrated seawater generated may be pumped away by the ejector together, resulting in a waste of necessary desalinated water, or the concentrated water cannot be discharged in time to fill the distiller and pollute the desalinated water

In addition, the water production rate of desalinated water is unstable, so that it is difficult to match the rated flow rate of the marine condensate pump. Usually, the marine condensate pump cannot run at full load, resulting in waste of electricity

Images