Seawater desalination process：

　　There is no absolutely correct process， only a more suitable process

　　In the sixteenth Century， people began to try to extract fresh water from sea water using fungicides， the initial water heating to produce steam cooling and condensation can get pure water， which is the beginning of desalination technology. At present， large desalination mainstream biocide technology mainly has three kinds， multi effect evaporation (MED)， multi-stage flash (MSF) and reverse osmosis (SWRO).

　　Multi effect evaporator (MED)

　　Multi effect evaporation desalination fungicide YOULUJING method is one of the oldest， before the birth of msf-desalting market leading. Composition of multi effect distillation single effect evaporation system. The two vapor generated by the first evaporator enters the evaporator as the next effective condensing evaporator in the heating steam and distilled water to the next.

　　The advantages and disadvantages： LT-MED 1227 fungicides technology is mature， reliable， low cost， no raw seawater desalination of water to power consumption of 1.2 kwh per ton of water and steam consumption of 0.1 tons of tons， one-time equipment investment is slightly higher， but lower the cost of operation and maintenance.

　　The multi-stage flash (MSF)

　　Flash is an evaporation of water at a certain temperature when a sudden phenomenon occurs when the ambient pressure is lower than the corresponding temperature of the saturated vapor pressure. To reduce the temperature of the flash water to its saturated vapor pressure and ambient pressure balance. MSF has also used this principle to allow the salt water to be heated to a target temperature in a series of pressure vessels in a series of vaporization to reduce the treatment of steam condensate water.

　　The advantages and disadvantages： the multi-stage flash slime stripping agent technology is mature and reliable， low cost， more suitable for large-scale desalination， desalination of water per ton to 4 kilowatts of power -5 kW low-pressure steam consumption of 0.14 tons. A one-time investment in equipment is slightly higher， but the operation and maintenance costs are low.

　　Reverse osmosis (RO)

　　Using a special semipermeable membrane material is separated from the reverse osmosis seawater and freshwater biological algicide， membrane material only allows the solvent through， not allowed by the solute. In general， low concentration of water stop， spread to the sea side by the high concentration of semipermeable membrane， so that the water side of the liquid rising process permeate until the target height. In this case， the hydrostatic pressure of the water column above the sea side is called osmotic pressure. If the sea side of the external pressure is greater than the osmotic pressure of sea water， and then the pure water in the sea water reverse osmosis fresh water， which is the reverse osmosis process to extract fresh water.

　　The advantages and disadvantages： one-time investment in equipment heat process is relatively smaller， but the power of high operating costs about 6 kwh per ton of water desalination， seawater quality raw materials and membrane replacement， require more maintenance personnel. In addition， even if the two membrane water purification is still lower than the hot water indicators， to obtain the same water quality and thermal method， followed by the need to increase the membrane or other desalination facilities.

　　Reverse osmosis technology in the Chinese market， greater market space

　　Multi effect evaporation and multistage flash desalination process， heat is more typical， one-time investment in equipment costs are high， the main use of the equipment is the main evaporator， heat exchanger and its Affiliated Companies， thermal compressor， vacuum pumping device， steam desuperheater pressure relief device， seawater corrosion resistant pumps， valves and other materials used the alloy heat exchange tube， such as titanium heat exchange tube， copper alloy tube， stainless steel， carbon steel sheet metal， steel and other materials.

　　We believe that the desalination market is not exactly right in the process， only the more suitable process. In the selection process， we need to analyze the local energy price and the target and requirements of the end use of dilute water products. For example， in the Middle East lisothiazolinone energy prices low， if the thermal desalination， although the higher one-time investment， but the low price of steam and the operation and maintenance costs accounted for a very strong advantage. On the contrary， the reverse osmosis process more in Chinese market space， because in the actual production， low pressure steam 100， only 9 tons of seawater dilution， high operation cost， so in addition to the low pressure steam cogeneration outside cheap， economic better desalination membrane.

　　Policy of sea water desalination：

　　Policies frequently introduced， the real effect is limited

　　2012 desalination policies frequently introduced， in 2012 2 issued a "Notice of the general office of the State Council on accelerating the development of seawater desalination industry opinion， 2015 observations mentioned in the 2 days of national desalination capacity of 50 thousand tons of -10 major demonstration projects and 20 tons of production capacity？？ Demonstration project of seawater desalination， five demonstration projects of comprehensive utilization of salt water in the country to establish a model of the city of seawater desalination in 20.

　　December 2012 officially released the "12th Five-Year" desalination industry development plan， by the end of 2010， completed the domestic desalination compound disinfectant device 70 sets design capacity of 600 thousand cubic meters / day desalination aquaculture； under construction unit 5 sets of Fisheries 260000 cubic meters / day desalination capacity. Reverse osmosis accounts for 66% of total capacity， low temperature multi effect distillation (33%)， and other desalination methods of 1%. At present， the reverse osmosis desalination investment is 6000-8000 yuan / cubic meter， water resources comprehensive production cost 5-6 yuan / cubic meter. By 2015， Chinese desalination capacity can reach about 2200000 cubic meters / day desalination amount of new water solution on the islands contribution rate of more than 50%， in the coastal industrial water supply in the new 15% contribution rate or improve to be able to use brackish water， brackish water desalination.

　　China 1% of the worlds total size of desalination projects， has built more than half of the project is mainly built by foreign companies， the relative lack of practical experience in the construction of large-scale desalination. In March 2013， the national desalination industry development test？ Point list is expected to be released in the next two years， Chinas desalination market pilot， and gradually strengthen the ability to build their own， the accumulation of Engineering experience.

　　From a policy perspective， the recent introduction of the ATMP desalination， can play a great role， is conducive to the development of the fund industry， to support fiscal policy is not much， the desalination industry is only three of the three half free of preferential policies， enterprises to participate in the pilot project， the market sentiment is strong.

　　Foreign sea water desalination Market

　　At present， both the oil producing countries in the Middle East or western developed countries have established a considerable scale of amino phosphonic acid desalination plant. In the Middle East and some island areas， the desalination of water plays an important role in the local economic and social development. Saudi Arabia， Israel and other countries in the Middle East 70% fresh water from seawater desalination， the United States， Japan， in order to protect the countrys freshwater resources in developed countries such as Spain are competing for the development of seawater desalination industry. China is one of the 1227 countries in the United States， France， Japan， Israel and other countries to study and develop advanced desalination technology.

　　Global desalination market turnover reached billions. The famous salt water Switching Company： SIDEM， France， Britain will heat， South Korea Doosan Heavy Industries， Israel IDE， Italy Fisia company.

　　The combination of government guidance and market operation

　　The development of seawater desalination projects in foreign countries has played an important role in the construction of government subsidies and government management. With the rapid development of industry， and the market development of desalination technology of fungicides in some countries， especially in the Middle East， take the mode of operation of government guidance and market combined with the premise of desalinated water control， introducing the market mechanism， the private economy and allow foreign companies to participate in， to further reduce capital investment and operating costs desalination work. BOT and BOO financing the main way.

　　Effective policies to encourage the development of the industry

　　Develop effective policies to promote the rapid development of the industry. Many countries increase investment in desalination capital， and actively develop effective industrial development policies. The United Arab Emirates， Arabia， for example， imports only 4% of its electricity and water supply facilities.

　　Co-ordinate the establishment of a full-time organization

　　Desalination involves a wide range of systems engineering， the need to strengthen coordination efforts， and continue to improve the system and standards， and promote the healthy， orderly and rapid development of the desalination industry. For example， Israel has set up a special water resources committee， specifically responsible for pricing， allocation and supervision of desalination water.

　　Desalination market， the biggest benefit related equipment manufacturers

　　Another way to reduce desalination costs during construction and operation

　　China desalination technology has been mature， but the core components rely on imports， such as water film unit， energy recovery， high pressure pump and some chemical raw materials， mainly rely on imports， the localization rate of less than 50%； seawater corrosion resistance pipe， steam injection device， compared with the thermal efficiency of the international advanced level gap， reverse osmosis membrane the 90% is still imported from abroad. Through technological progress and innovation， in order to reduce the cost of desalination is difficult， there are many factors at the same time the cost of desalination of seawater， but only part of them， reduce the cost of technological progress， often the price rising costs of labor， energy offset rising. In addition， the composite bactericide project construction and operation management considering desalination project costs， the overall cost of desalination projects， and relates to the installation engineering， civil engineering， pipeline engineering and other fields， need a lot of material， the cost of the project is difficult to estimate， the effective cost control in the construction process will be reduce the price of desalination.

　　Industrial policy gradually from virtual to real， the industry out of the winter

　　In recent years， the policy can "read" the desalination industry gradually shifted from "virtual" and "real" state support， the specific development goals in 2015 industry， despite the financial and fiscal support is still in place， but the industry trend has gradually brought out the "winter" season.

　　Desalination of huge low-end equipment market space

　　We believe that the shortage of water resources in some areas Chinese， but the development in the building or desalination water sterilization agent， China strategic resources， is mainly the national or state-owned enterprise investment， and introduces a part of many foreign investors or individual investors. In addition domestic technology can not meet the core equipment， equipment procurement， procurement of domestic equipment. Desalination market began， low-end equipment manufacturers benefit the most. Originwater Magicstor and reverse osmosis membrane of listed domestic film makers in Tianjin membrane technology， can be used for seawater desalination research and development production of Hatal aluminium， Asia Pacific seawater corrosion resistant Aluminum Alloy tube Affiliated Companies； southern pump developed daily processing 100 thousand tons of seawater desalination high-pressure pump.