1 desalination technology
China is a large water resources, but also poor water resources. Seawater ™as an important part of water resources, effective use is to solve Chi↕na's water crisis one of the important measures.
Membrane technology for seawater desalination is mainly reverse osmosis, electroosmo∞tic (ED) and membrane distillation (MD) and so on. The desalination rate of reverse osαmosis membrane for seawater desalination is as high as 99.6%. The emerαgence and development of reverse osmosis technology greatl≈y reduce the cost of desalination, and now reverse osmosis has become the most eco✔nomical means of desalination of drinking water, the technology has the following γadvantages:
1． application of membrane method desalination of seawater technology is very mature;
2． reverse osmosis membrane material, membrane components production technology is mature, the pr×ice dropped significantly, the application cost is getting lower and lower;
3． low power consumption, the existing technology has reache$d the water consumption of 1.8 - 4.5 degrees or so, is conducive to energy conservation, reduce ☆water costs;
4．membrane method desalination of seawater as a unit combination, the construc→tion scale can be gradually expanded to facilitate the applica tion;
5．It is a mature technology and engineering, and its investment risk •is very small. The investment of membrane equipmen©t is related to civil engineering, power engineering,₽ self - control engineering, pipeline engineering and other related projects.
6． reverse osmosis desalination of seawater, coupled with← the nanofiltration membrane technology, to retain the presence of seawater beneficial to the huma∑n body a variety of trace minerals, with biological activity, can be directly drinking healthy dr₽inking water;
7． reverse osmosis desalination of water without change, separated from the concentration of seawat'er salinity than the original sea water 2-3 times higher, the concentrated sea water can not only b'e used to breed such as sea cucumber, abalone, scallops, large yellow croaker, shri♣mp, eel, etc. High-grade seafood, but also from the more economical extraction of ≥bromine, magnesium, uranium, gypsum, Glauber's salt, salt, δpotassium oxide, magnesium sulfate, magnesium chloride, magnesium phosphate, magnesium oxide and© other marine chemical substances to achieve comprehensive utilization of marine resour♠ces;
8． The film used is a hygienic polymer material, can completely cut off bacteria, viruses, collage™n, heavy metal ions and other harmful substances, will benefit the people•'s health.
2, The characteristics of small desalination equipment
Small desalination equipment to take full account of the requirements of the user εdesign and production, according to the island / ship / yacht / oil drilling p$latform application of the particularity of the speci↑al design, desalination machine small size, light weight, covers th≠e province, easy installation, Adaptable, long life, simp le operation equipment, easy maintenance, safe and reliable, innovative design clever, to avoi≥d frequent cleaning, no environmental pollution. Seawater desalination water quality in line wit→h national drinking water quality standards (GB5749-2006).
1． Low energy consumption: With a variety of energy recovery system experienc∑e, the use of efficient energy recovery system and the overall oΩptimization of the design makes the energy consumption greatly reduced.
2． Long service life: rigorous process design and sophisticated equipment selection, to ensure a longer system life and lower maintenance costs.
3． Water quality and stability: advanced water quality control and excellent system maintenance pr↔ogram to ensure long-term stability of water quality.
4． highly intelligent: with years of accumulated experience→ in the project, summed up a set of operation and management model, according to the actual ®needs of users, developed desalination monitoring software to provide a good man-machine dialogue function of the central control automatic control system.
5． Applicable sea water temperature range: Seawater desalination device due to the ±use of proprietary technology, so that it can be 2 ℃ -30 ℃ w≠ater temperature range full load operation, will not be due to temp✘erature drop caused by decreased water production, •to ensure that users in the Under any conditions can be rated water production.
6． Successful application of modular systems: Successful use of space and techno↔logy Rationally Based on years of successful use of desalin ation technology, rich experience in design and co₹nstruction has been accumulated and modular design has been successf∏ully applied to desalination systems. System configuration is more reasonable, more convenient★ construction, fast. To meet the different needs of customers.
7． computer program control: the entire reverse osmosis desalination control system designed us₩ing advanced computer program control at home and abroad, by the IPC o→perating station programmable controller PLC composed of a decentralized samplin↑g control, centralized monitoring operation of the control sy×stem. According to the process parameters set high and low voltage protection switch, ↑automatic switching device, conductance, flow and pr≠essure abnormalities, can achieve automatic switching, automatic interlocking alarm,★ shutdown, to protect the high pressure pump and reverse osmos is membrane components. Frequency control high-pressure pump start an"d shut down to achieve high-pressure pump soft operation, sav₩ing energy, to prevent water hammer or back pressure caused by high pressure pump and membr↕ane components damage. Program design in the reverse osm↑osis device before and after the shutdown, can achieve low pressure automaεtic flushing, especially in the outage, the concentration of seawater wiσll stabilize the state of precipitation, pollution film, low pressure desalination water c an be washed out of concentrated water, Membrane is not contami nated and prolongs the service life of the membrane. The system of temperature, flow, water q✔uality, yield and other related parameters to achieve display, storage, statistics, tabulation and printing. The dynamic process flow i∏n the monitoring operation is clear and intuitive, and the system control simplifies manual opαeration to ensure that the system can operate automatically, safely and reliably.
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