The invention discloses icing and reverse osmosis seawater desalination equipment and a control method thereof. A double-layer pipe is used for conveying new seawater and discharging concentrated seawater, and the filtered new seawater is heated up to 20 DEG C and is then placed in a reverse osmosis seawater desalination device for producing desalinated water; a seawater icing device consists of asteam boiler, a water vapor storage tank, a water vapor organic silicon rubber pipeline, a water vapor electromagnetic valve, a stainless steel hollow mesh and a sinking and floating device; the stainless steel hollow mesh is formed by sequentially splicing a stainless steel wind shield, a stainless steel heating square tube and a stainless steel floating tube with two closed ends from top to bottom. In winter, the seawater freezes in the stainless steel hollow mesh; water vapor enters the stainless steel heating square tube and then melts the edges of ice cubes; floating ice are crushed andthen transported to the shore by a ship, and then sent to a seawater ice funnel by means of a belt conveyor or a chain conveyor. A desalination water pump is inserted into the seawater ice funnel by means of a desalination tube, desalinated water is mixed with the crushed seawater ice, and the mixture is then sent to the waterworks through a chemical water pipe by means of a rodless screw extrusion conveying pump.

Icing and reverse osmosis seawater desalination equipment and control method thereof

The invention provides a seawater desalination process applied in steel production, a waste heat recycling system is fully utilized to recover waste heat from waste heat carriers in all processes of steel production, pretreatment is increased before seawater desalination treatment, seawater is coagulated and filtered, sodium bisulfite is added, residual chlorine in seawater is removed, insoluble inorganic salts are effectively prevented from being precipitated on inner wall of a machine in subsequent processes, seawater waste heat is recycled before the seawater is distilled, high-temperaturesteam produced by distillation can be used, and heat energy of the high-temperature steam is fully recycled; the working intensity of a condenser is also reduced, the process is economical and environmental friendly, and the energy utilization rate is high. A distillation tank is provided with a steam heating pipe to further heat the steam, and the heat energy released by a heating coil pipe is used for evaporating water and performing secondary heating of the steam respectively. The energy utilization rate is high, and meanwhile, the heat loss is low.

Seawater desalination process applied in steel production

The invention relates to the technical field of seawater desalination treatment, in particular to an electrodialysis seawater desalination method. The method comprises the following steps: (1) carrying out seawater pretreatment; (2) carrying out ultrafiltration; (3) carrying out primary reverse osmosis filtration; (4) carrying out secondary reverse osmosis filtration; (5) carrying out electrodialysis treatment. The electrodialysis seawater desalination method provided by the invention is implemented by the steps of seawater pretreatment, ultrafiltration, primary reverse osmosis filtration, secondary reverse osmosis filtration, electrodialysis treatment, and the like; in the seawater pretreatment stage, the ferrous sulfate and hydrogen peroxide are added after the pH is adjusted; by means of the strong oxidizing property formed under the action of the ferrous sulfate and the hydrogen peroxide, the seawater is flocculated, and part of organic matters in the seawater can be removed at thesame time; the electrodialysis seawater desalination method provided by the invention reduces the cost of seawater desalination to a greater extent, and considerable economic benefits can be generated; furthermore, the method fully utilizes the resources, and is less in investment and low in operating cost, thus having a higher promotion value.

Electrodialysis seawater desalination method

The invention discloses a seawater desalination method. The seawater desalination method comprises the following steps: seawater pretreatment, ultrafiltration filtration, first-stage reverse osmosis membrane filtration, second-stage reverse osmosis membrane filtration and mineralization. The mineralization comprises the steps of introducing carbon dioxide gas into water of a desalination water tank, and adding a saturated limewater solution, wherein the adding proportion of carbon dioxide and saturated limewater is 2.5 to 1, and the contents of residual chlorine at a raw seawater inlet pipeline, a front filter, an ultrafiltration system, an ultrafiltration water producing pipeline and an ultrafiltration water tank are respectively 5ppm, 4ppm, 2ppm, 1ppm and 0.8ppm. The mineralization method is direct, simple, efficient, short in consumed time and stable in water quality; and a sodium hypochlorite adding site is arranged at a seawater extraction hole, and a reducing agent adding site and a non-oxidation sterilizing agent feeding point are arranged in front of a reverse osmosis membrane group, so that the sterilization effect of a full seawater desalination line can be guaranteed, the osmosis membrane is not damaged, meanwhile, the use amount of the non-oxidation sterilizing agent can be further reduced, and the cost is lowered.

Wang Huali

Papers

Seawater desalination method