The application of titanium tube in seawater desalination

Desalination has become the main mode of the Middle East and other areas where lack of water to obtain fresh water.In desalination production methods,application the most is the multi-stage flash method, the method of the equipment is mainly composed of the water heating, heat recovery condenser, heat output condenser, ventilation coagulator and injection compressor parts, such as heat exchange area use a lot of the pipe, the original use of copper alloy tube, because the copper alloy corrosion resistant, has now been replaced by titanium tube.Compared with the shell and tube heat exchanger made of titanium plate GR2 TITANIUMCN plate heat exchanger has many advantages, has a strong competitiveness in the market, is mainly used in chemical, petroleum, ships, such as desalination heat exchange system.As the Middle East and Asia power and desalination market development, the demand of thin-wall titanium welding pipe will also gradually increase, thereby giving impetus to the market demand of titanium, form new economic growth point.
Is the first choice for seawater desalination equipment heat exchanger titanium material.Currently, the main titanium application of heat pipe of seawater desalination equipment.Multi-stage flash desalination device, mature technology, high energy efficiency, 78% of the world's fresh water to build water evaporation method is adopted.Successful development of the domestic MSF device will make it become a coastal power plant boiler make-up water preferred equipment.Contact with high temperature water desalination plant in the evaporator, salinity increase after evaporation.Titanium ion corrosion resistance to high temperature, can be widely used in evaporator desalination device, at the same time, the titanium chloride has a strong corrosion resistance, is the first choice for seawater desalination equipment heat exchanger materials.In titanium material choice, is the most widely used industrial pure titanium ASTMGrade2, suggests Grade1 and Grade2 of industrial pure titanium in natural water, seawater and various kinds of chloride has a special ability to resist the influence of stress corrosion crack;But higher water heater temperature using has the high corrosive Grade7 or Grade12;Grade16 has higher corrosion resistance, but the cost is more expensive.In addition, the water flow velocity is 3 ~ 5 m/s of titanium in seawater desalination equipment, biological fouling phenomenon is the slightest, titanium heat exchanger fouling coefficient of about 0.95 ~ 0.95.
Fresh water demand is increasing, the sea area with use of Marine resources for rise, long beach and abundant cheap water resources, to the sea is a period in the future to benefit our country's a new economic growth point, the application of titanium and titanium alloy in seawater desalination wide prospect of market.