Method for preparing fresh-water ice by utilizing seawater and brackish water

Abstract

The invention relates to a method for preparing fresh-water ice by utilizing sweater and brackish water. The existing ice marker only has a pure ice making function and does not have a desalting function. The method comprises the following steps of: performing primary filtration, secondary filtration, tertiary filtration and quaternary filtration on the seawater or the brackish water sequentially through a multi-medium filter, a security filter, a micro-filtration membrane and an ultra-filtration membrane, so as to obtain the quaternary filtered fluid; desalting the quaternary filtered fluid by virtue of a separating method of membrane distillation, forward osmosis or electro-osmosis to obtain desalted water with the purity greater than and equal to 99.9%; and obtaining the fresh-water ice through air-cooling or water-cooling condensing of the desalted water. According to the method disclosed by the invention, the fresh-water ice can be automatically prepared by utilizing the seawater or the brackish water; when the inlet water is the seawater or the brackish water with salinity higher than 2%, the fresh-water ice can be prepared through multi-medium filtration, security filtration, micro filtration, ultra-filtration and salt-water separating systems as well as an ice making system, so that the method is especially applicable to the needs of catching and fresh-keeping of ocean fishing vessels.

Description

technical field [0001] The invention belongs to the field of desalination of seawater and brackish water, in particular to a method for preparing freshwater ice from seawater and brackish water. Background technique [0002] At present, with the development of the economy and the improvement of people's living standards, the demand and quality requirements for freshwater ice in all walks of life are getting higher and higher. For example, in the processing of aquatic products, meat, and food, flake ice can keep the products fresh; in supermarkets and aquatic product markets, freshwater ice can prolong their storage period and ensure freshness; during long-distance transportation, such as ocean Fishing, long-distance transportation of vegetables, and fresh water ice can also ensure their freshness. In addition, fresh water ice also has an important application in concrete engineering: when concrete is poured on a large scale in hot seasons, the pouring temperature of concret...

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Problems solved by technology

In the comparative invention patent with the patent number CN100414219C, the name is "marine ice machine with double adsorption bed chemical adsorption driven by waste heat", which is characterized in that part of the waste heat on the fishing boat is used to drive the adsorption refrigeration system, although the flue gas heating is used Since the seawater directly enters the ice machine, it is unavoidable to corrode the ice making system under long-term operation conditions.